Summary Post for Oil Refining Technology Exchange Area (29) – Various Questions
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I have compiled all the posts related to technical discussions on various issues within the oil refining technology exchange area, so as to make it easier for everyone to find what they need, save time, and assist others in resolving their problems! Floor 1: 1–100 Floor 2: 101–200 Floor 3: 201–300 Floor 4: 301–400 Floor 5: 401–500 Floor 6: 501–600 (Click the title directly to access the hyperlink) 1. Issues related to catalytic distillation 2. Problems with the main fans and boosters in catalytic cracking units 3. A platform for discussing issues related to the startup, shutdown, and maintenance of plants 4. Questions regarding the crude oil blending ratio 5. Several issues related to excessive temperature rise in the beds of hydrogenation units 6. Determining the appropriate constant-temperature dehydrogenation pressure for hydrogenation units 7. Issues related to the purge distillation system 8. Problems with pressure control in the buffer tanks for feedstock oil in catalytic cracking units 9. Some questions regarding nozzles 10. Environmental issues that need to be addressed urgently in refineries’ catalytic cracking units 11. Let’s discuss issues related to the emission of purge gases during maintenance periods 12. A dedicated thread for addressing urgent problems in production units 13. It is recommended that suggestions and questions be technical in nature and targeted. . . 14. Issues related to electrical desalination in heavy oil catalytic units 15. Problems with diesel alkali sludge 16. Issues encountered during the initial operation of delayed coking units 17. Problems concerning the steam consumption in deaerators 18. Issues related to water injection in hydrogenation units 19. Problems associated with gasoline refining 20. Crystallization issues! 21. Problems with water supply for wet air cooling 22. Issues related to hydrogenation units 23. Questions regarding \"processing incoming materials\"? Who can explain it in depth! 24. Regarding questions about the material used for the coke tower, please ask an expert to answer. 25. Does anyone know what the problem is with this hydrogenation furnace? 26. Problems in catalytic cracking and ethylene cracking. 27. Please share the issues encountered during the shutdown of catalytic cracking units. 28. Issues related to the purity of product hydrogen. 29. Problems with the rich gas desulfurization system. 30. Water conservation issues in the coking plant. 31. Operations and issues after alkali washing of oils. 32. Issues related to the liquid level of oil slurry at the bottom of the distillation tower. 33. What measures have refineries across different regions taken to address the problem of high olefin content in gasoline? 34. Issues regarding the fire-retardant layer of stainless steel wire fire arrestors 35. Difficulties encountered during the initial operation of delayed coking units 36. Problems related to the lifespan of expansion joints 37. Issues concerning the change in the water injection point in hydrocracking units 38. Hydrogen production issues 39. Bonuses issues 40. Problems with catalytic cracking and thermal cracking 41. Issues related to the processing of used engine oil! 42. Issues regarding the high carbon content in catalytic cracking (wax oil) catalysts. 43. Issues related to catalytic cracking terminators. 44. Seeking advice on some types of solvent oils. 45. Issues related to atmospheric pressure. 46. Issues concerning diesel fuel freezing points. 47. How to calculate the theoretical losses in a plant? Could an expert provide guidance on practical production issues? 48. Issues related to the internal structure of the wastewater stripping tower and ammonia purification tower. 49. Problems with steam traps during hydrostatic testing. 50. Issues related to differential pressure control in catalytic cracking. 51. Let’s discuss a problem associated with the vacuum distillation tower in atmospheric and vacuum distillation units! ! ! 52. Issues related to calculating the flash point of light oils. 53. Issues related to temper embrittlement in reactors. 54. What are the technical challenges in using catalytic diesel in riser reprocessing to increase gasoline production? 55. Issues related to LPG desulfurization and alcohol removal. 56. Problems with using acidic water as a terminator. 57. Questions regarding high-pressure hydrogenation units. 58. Issues related to dust in PSA systems. 59. Problems with external heat exchangers. 60. Issues with light diesel produced by catalytic cracking. 61. Seeking help regarding hydrocracking problems. 62. Problem of gasoline not meeting corrosion resistance standards. 63. Hydrocracking issues. 64. Reforming problems: The amount of combustion air during dry running turned out to be negative! 65. Issues related to heavy oil catalytic catalysts. 66. Problems with dehydrators in hydrocracking. 67. Handling of waste fluid from automatically backwashed amine filters. 68. Questions regarding hydrogenation reactors. 69. Issues related to the shutdown of solvent deasphalting units – please advise! 70. Discussion: The issue of mid-pressure reflux in atmospheric and vacuum distillation? 71. A question regarding delayed coking. 72. Are there any experts from Maoming, Qilu, or Hainan refineries here? I have a question to ask 73. May I ask about the methods and issues related to the alkaline washing of oil products? 74. Issues with sulfurized catalysts in hydrocracking. 75. Problems with wax oil circulation during the startup of coking units. 76. Salt deposition on tower trays. 77. Issues related to pressure relief in hydrocracking. 78. Please, those working in the hydrogenation unit, share your insights on how to address the problem of corrosive sulfur in this unit; there is an urgent request for help on the 13th floor! 79. Issues related to the control of inventory in the stripping section. 80. Problems concerning the setting of the counter-rotation line for the recycle hydrogen compressor. 81. A question regarding crude gasoline and stabilized gasoline. 82. Seeking advice on catalytic MIP issues. 83. Problems related to the hydrogenation of jet fuel. 84. Issues related to changing the feed tanks for catalyst cracking reactions. 85. Questions about new coking processes. 86. Seeking help with hydrocracking issues. 87. Questions regarding the use of additives in cracking processes – seeking advice 88. Issues related to line cleaning during the shutdown of the 2 million tons/year diesel hydrogenation unit. 89. Problems with the catalytic reactor and regenerator system. 90. A question regarding the residue hydrogenation unit? 91. How is the UOP continuous reforming (Dalian Petrochemical’s catalyst regeneration system) performing? (For example, those issues) 92, issues related to the actual boiling point test; 93, issues concerning the catalytic cracking capacity? 94. Issue regarding the purity of hydrogen used in hydrogenation. 95. Seeking advice on the removal of catalyst from the slurry and flue gas in catalytic cracking processes in petrochemical plants. 96. Problem of high pressure difference when switching between filter tanks A in the backwash filtration system for hydrocracking feed oil. 97. Seeking information on Confluent’s S-Zorb product. 98. Questions regarding water 99. Questions regarding catalytic cracking units 100. Seeking help with hydrocracking issues
Continuing: 101. Issues with rotating the new hydrogen compressor; 102. Problem of nitrogen content in hydrogenation feedstock; 103. Issues related to starting up catalytic cracking units; 104. Seeking help regarding hydrocracking problems; 105. Issues concerning absorption stabilization. 106. Two issues related to the hydrocracking process. 107. Issues concerning the plate heat exchangers in continuous reforming. 108. Questions regarding the grades of lubricant base oils. 109. Issues related to coking removal in coke towers? 110. Regarding the selection of pumps for coking feedstock. . . 111. Issues with the hydrogen mixing shut-off valve in front of the hydrogenation furnace. 112. Problems related to compressor surging. 113. Issues concerning the freezing point at the catalytic cracking distillation unit. 114. Problems with the slugging valves in the dual riser system of catalytic cracking 115. Calculation of the cold oil flow rate in coking heaters? 116. Vibration problem in the inlet pipeline of hydrogenation reactors? ? 117. Regarding several issues related to hydrocracking, I would appreciate your advice! 118. A question about lubricant base oils. 119. Questions regarding the cyclic hydrogen compressor! Everyone, please help take a look: 120 – Questions regarding hydrocracking; 121 – Issues related to the amount of catalyst used in catalytic units; 122 – Discussion on the design of atmospheric pressure furnaces; 123 – Problems related to the coking cycle; 124 – Issues concerning pressure drops in hydrocracking processes; 125 – A question regarding the regeneration phase of continuous reforming. 126. Issues related to the commissioning of new equipment (I) 127. Problems with the catalytic liquefied gas hydrogen sulfide removal tower? 128. I have a question regarding the desulfurization of liquefied gas; I would appreciate some guidance from experts. 129. Issues related to catalytic smoke extractors. 130. Problems associated with oil transportation. 131. Challenges in starting up hydrocracking units in winter. 132. A question about FCC sulfur-reduction catalysts. 133. A simpler question: industrial side-stream experiments. 134. Salt deposition in acidic water stripping towers. 135. How to deal with scaling issues in acidic water stripping towers. 136. Issues related to the use of desalting agents. 137. Material choices for tanks used in storing hydrogen antioxidants for aviation fuel, as well as for the pipelines used to transport them. 138. Fractionation problems during the startup of catalytic units. 139. Stress corrosion issues in catalytic regenerators. 140. “Backflow” problems in recycle hydrogen compressors! 141. Difficulties encountered during individual tests of steam turbines. 142. Problems arising from a decrease in the amount of fresh hydrogen available in hydrocracking units. 143. Safety considerations during major overhauls of coking units. 144. Issues related to reforming processes. 145. What problems have been encountered recently in the operation and maintenance of reforming units? How to handle it? 146. Questions regarding sulfur liquid sulfur tanks. 147. How can coking in the furnace tubes of the heating furnaces in atmospheric and vacuum distillation units be reduced? 148. Issues regarding the catalyst startup agent. 149. Questions about the pressure drop in catalytic cracking reactors? 150. Issues related to the composition of hydrocracking feedstock. 151. Organizing discussions on the issue of \"coking pellets\" in the forum. 152. The cetane number of diesel. 153. What considerations are necessary during the transfer of crude oil from storage tanks to atmospheric and vacuum distillation units via pumps? 154. Issues related to the hydrogenation of gasoline and diesel. 155. Problems regarding the coordinated control of space velocity and temperature in hydrocracking? 156. Issues related to the color of hydrogenated refined diesel 157. Problems associated with the hydrogenation refining of gasoline and diesel 158. Issues concerning metal passivators in heavy catalysis 159. Problems encountered during the start-up of distillation units 160. Problems related to the desulfurization of gasoline 161. Practical issues in gas separation 162. A problem encountered during distillation tower operation 163. Issues regarding the distribution and properties of hydrocracking products 164. Several questions related to oil refining 165. A question regarding distillation! 166. Issues related to waste lubricating oil regeneration technology 167. Handover issues for newly built facilities 168. Problems in calculating the water-chlorine balance during [reformation] 169. The problem of high amounts of coke powder entrained in coker liquefied gas 170. Please help diagnose these problems 171. Difficult issues in the reaction unit 172. Issues with alkali solution preparation? 173. Summary of operational difficulties (problems) caused by the lack of design changes in newly commissioned refineries due to design reasons. 174. Problem of oil-water emulsification in bottom stream extraction!! 175. Problems related to vacuum distillation. 176. Problems with boilers used in newly built catalytic units. 177. Freezing prevention issues for carbon disulfide pump rooms in hydrocracking units in northern regions. 178. Regarding catalysts used for desulfurization, I would appreciate your advice (I’m stuck). 179. Issues related to freezing prevention in winter. 180. Problems with hydrogenation units. 181. Automatic control of mixing intensity in water injection mixers for electrodesalination. 182. Questions regarding feed oil. 183. Issues related to terminators. 184. Problems with sewage and drainage from heavy oil tanks? 185. Issues related to hydrogen production from naphtha? 186. Problems concerning the thickening of catalytic feedstocks. 187. Issues related to the operation of FDFCC units. 188. Problems with the opening degree of the butterfly valve at the fan inlet when starting up the exhaust fan. 189. Issues with the catalytic stabilization system. 190. Seeking help regarding acid water stripping operations. 191. Problems concerning the thickening of catalytic feedstocks. 192. Issues related to the processing of Russian M100 crude oil. 193. Several problems with the catalytic distillation system. 194. Issues related to petroleum coke. 195. Problems with igniting flares. 196. (Seeking help) Issues with the distillation towers in the hydrocracking section of refineries. 197. Problems with extinguishing fires in coking furnaces during winter. 198. Optimization of catalytic quenching agents! 199. Issues related to the installation of orifice plate flow meters. 200. Problems associated with the use of four-in-one heating furnaces in continuous reforming processes
Continuing: 201. A beginner seeks advice on hydrocracking issues. 202. Question regarding electrodialysis. 203. Questions about the main fan. 204. Questions about a sense of responsibility. 205. Problem of acidic water crystallization in the refining unit during winter. 206. Issues with compressors. 207. Problems related to initial nitrogen pressurization in the hydrogenation reactor. 208. PI-Datalink issues. 209. Issue regarding the color of jet fuel; please advise! ! ! 210. The issue of setting the pressure for regular pressure testing of safety valves. 211. The problem of increasing the processing capacity in catalytic units. 212. The issue of starting up hydroprocessing units. 213. Issues that are of concern to oil refiners. 214. Questions regarding the distillation system in hydrorefining processes. 215. What is the range of capacity adjustments possible in hydrocracking units? 216. Issues related to the start-up of hydrogen production 217. Problems with hydrocarbons 218. Issues concerning circulating oil 219. Problems of preventing freezing at low load levels 220. Issues related to temperature and pressure compensation for fluid flow rates 221. Problem of increased acidity in circulating water 222. Issues related to deep vacuum distillation 223. A complex issue regarding catalytic units 224. Could you discuss the processing and utilization of hydrogenation tail oil in your company? 225. Considerations regarding interlock issues with dry gas seals 226. Questions about compressors; I hope to get everyone’s help 227. Torch-related issues 228. Problems with the furnace tubes in hydrogen production converters 229. Issue of excessive mercaptan content 230. Problems associated with the use of domestically produced plate heat exchangers 231. Issues related to oil and gas partial pressures 232. Problem of non-condensable gas not being discharged from the stabilizer in catalytic units 233. Issues with desalinated water and circulating water 234. Problem with the reflux volume at the top of the stabilizer 235. Problem of inadequate siphoning in the reboiler at the bottom of the stabilizer! 236. Issues regarding pipeline insulation and heating in hydrocracking units, from high molecular weight to low molecular weight fractions. 237. Issues related to the yield of propylene. 238. Question to the moderator regarding the establishment of a QQ group. 239. Issues related to gasoline used for reflux at the top of the stabilizer. 240. Issues related to negative pressure in containers. 241. Precautions when feeding coker naphtha into a reformer. 242. Is it feasible to modify the feed heater in a catalytic cracking unit by removing the heat exchange element in the distillation system? 243. Issues related to nitrogen production by adsorption 244. Three minor problems in catalytic cracking units 245. Environmental issues that may arise from catalytic cracking units 246. A problem with valve operation 247. Issues related to vehicle loading platforms 248. Questions regarding coal-based oil refining 249. Problems with external heat exchangers 250. A question for everyone 251. Discuss the pressure drop issues in the distillation columns of your catalytic units 252. Issues related to steam quality 253. Problems concerning the measurement of catalytic gas-phase products 254. Issues related to the processing capacity of catalytic units 255. Problems with hydrogen pipelines in refineries 256. Questions regarding catalytic pyrolysis 257. Questions regarding tower top pressure 258. Issues related to the startup of recycle hydrogen compressors 259. Salt deposition problems in catalytic distillation columns 260. Issues related to controlling the liquid level in catalytic re-refining tanks 261. Problems with reducing the viscosity of 0# diesel in winter 262. Design and usage issues of the pre-raising section sleeves in FDFCC-III 263. DCS-related issues 264. Issues related to dehydrating hydrogen produced via hydrogen generation 265. Issues related to switching off control valves 266. Hydrogen consumption issues in hydrogenation processes 267. Anti-freezing issues after shutting down external heat exchangers. 268. Question regarding bridge cranes. 269. Issue with the pressure used to inject desulfurizing agents into crude oil. 270. Seeking help with hydrocracking issues. 271. A small issue. Prawns Help 272, Issues with the Interlock Setting for Low-Pressure Steam at the Turbine Outlet 273, Problems with the Stable Tower? ? 274. Issue regarding controlling the calorific value of hot water at the bottom of the vaporization tower. 275. Regarding the color of diesel, please suggest solutions. 276. Issues related to the centralized regeneration of amine solutions 277. Problem of pump cavitation when starting up catalytic units 278. Issues in refining fuel oil into gasoline and diesel 279. What problems have been encountered during production? How to solve it? 280. Discussion on the issue of sulfur purging during shutdown of sulfur recovery units. 281. The problem of temperature rise in hydrogenation reactors. 282. The issue regarding the C5 content in catalytic liquefied gas. 283. Catalyst conservation in CPP units. 284. What considerations should be taken when switching between primary and backup fans! 285. Let’s discuss the issue of “one removal and three injections”. 286. The problem of two-stage regeneration in high-low parallel catalytic cracking. 287. The issue of oil skimming in the circulating hydrogen desulfurization tower. 288. I’d like to ask everyone about issues related to the lubricating oil station. 289. Let’s discuss the issue of silicon content in the raw materials used in the hydroprocessing process. 290. Experts in catalytic cracking: What precautions should be taken when adjusting the lubricating oil pressure of the thrust bearings of smoke extractors and fans? 291. The issue of manual ignition of flares. 292. A question regarding expansion joints. 293. I have several questions about the raw materials and the process involved in the hydrorefining process. 294. The problem of liquid entrainment in centrifugal compressors. 295. Discussion on the yellowing of MTBE color. 296. New problems that arise due to sudden drops in temperature. 297. Issues with the dry gas pipeline network? 298. Several issues regarding the shutdown of hydrogenation units 299. A question about the gas separation unit 300. Issues related to nitrogen in the case of accidents in hydrocracking units
Continuing: 301. Issues related to starting up hydrogenation units in winter; 302. Problems concerning hydrocracked aviation fuel; 303. Questions regarding the speed control of steam turbines; 304. What happens to the components in the product distillate? 305. Problems with hydraulic motors 306. Pressure drop issues in catalytic cracking 307. Issues related to the upgrading of gasoline and diesel products 308. Energy-saving measures for heating furnaces 309. Views on naphtha distillation column issues 310. Questions regarding salt formation in atmospheric pressure columns 311. How do you address the issue of off-flow in top condensers? 312. Hydrocracking issues 313. Coking problems in furnace tubes 314. Issues with high-pressure separators 315. Questions regarding sampling probes? 316. The issue of finding outlets for sulfur in refineries. 317. Our industry is currently in a downturn, and I would like to discuss with everyone the issue of energy conservation and cost reduction! ! 318. Leakage issue in the reboiler at the bottom of the MTBE recovery tower. 319. Issues related to the purification of catalytic slurry. 320. Problems associated with catalyst deactivation. 321. Ball valve issues and other problems. 322. Issues related to the new hydrogen generator. 323. Problems concerning the gas seal and liquid separation tank. 324. Anti-freezing measures for coking units. 325. Issues related to the deformation of medium-pressure steam pipelines. 326. Problems related to stripping towers and stabilization towers. 327. Issues regarding the desulfurization of coker gasoline; everyone is welcome to discuss this. 328. Issues related to electrically heated molecular sieves. 329. Hydrogen purity issues in diesel hydrotreating. 330. Issues related to petroleum refining. 331. Problems related to the operation of the flue gas turbines in catalytic cracking units. 332. Issues related to venting at the top of the unit during catalyst startup. 333. Issues related to the density of lift pipes. 334. Issues related to oil refining costs. 335. Problems with high pressure drop and high bottom temperature in the distillation columns of heavy oil catalytic cracking units. 336. Issues related to top reflux flow and gas-liquid phase loads. 337. A problem related to the cracking reactor platform. 338. Issues related to the quality of acidic water. 339. Issues related to injection in atmospheric and vacuum distillation units! ! 340. Issues with the raw material stop valve 341. Sudden changes in flue gas dust concentration at the inlet and outlet of the catalytic three-spinners 342. Problems encountered in the distillation towers of oil refining units 343. Several issues related to coking? 344. Issues related to sulfur recovery efficiency 345. Issues concerning the quality of water used for stripping 346. Issues related to the conversion rate in catalytic cracking 347. Problems with oil presence in diesel hydrogenation units? 348. Catalytic charring issue! 349. Salt deposition problem 350. Freezing prevention issues in northern air-cooled systems 351. Yellowing of refined gasoline 352. An increase in pressure drop at the outlet of the lift pipe due to rough or single rotation – what does this indicate? 353. Salt deposition in coking distillation towers 354. Water separation from reduced-distillate sludge 355. Emulsification during alkaline washing of straight-run diesel 356. Issues related to cleaning oil slurry lines 357. Octane number of reformate oil 358. Issues regarding the specifications of heat exchanger bolts 359. Analysis and countermeasures for factors affecting the long-term operation of catalytic units 360. A simple question regarding the operation of clay towers 361. Issues related to liquefied petroleum gas coking 362. Acidity problems 363. Deformation of heavy oil tanks 364. Inspection procedures for industrial units 365. Identifying valve models 366. Flow rate issues with heat tracing lines 367. How to detect diesel properties quickly and accurately! ! How to solve the water removal problem in tire oil? ? 368. The issue of bromine value. 369. The torch issue. 370. Let’s discuss the issue of ammonia injection in the distillation tower 371. Issues related to the use of collection pumps in oil refining processes. 372. What are the problems in the refined oil market? 373. Regarding the use of RAG-11 catalysts, those who have used it please share their experiences. Thank you! 374. Problems related to coked particles 375. Issues with chlorine content in hydrogenation feedstocks 376. Questions regarding target shooting 377. Problems with the use of coolers 378. Issues with ammonium salts in hydrodesulfurization 379. Problems with diesel color change 380. A minor issue related to air cooling 381. MTBE-related problems 382. Design issues related to the flash dehydration tower for fuel oil M100 383. Solutions to filtration problems in coker diesel 384. How to address the problem of frequent filter cleaning required for the hot water pumps used in coking processes? 385, Guys who work with dry catalysis, please help solve this problem! 386, What’s the issue with the one-way damping valve in the main air duct? 387. Design issues related to electrodialysis 388. Increased air content in the dry gas from catalytic cracking units – a new issue 389. Problems with the feed to the catalytic cracking riser 390. Issues with the riser nozzles 391. A basic question 392. What about the coking cycle ratio? 393. Issue regarding vacuum testing for leak detection. 394. Question about the circulation method in closed hoppers. 395. How are hydrogen-related problems in refineries generally resolved? 396. Problems with blockage of the high-pressure cut-off valve in hydrogenation processes. 397. Issues related to axial flow fans. 398. Problems concerning the vapor pressures of liquefied gas and gasoline. 399. Issues related to aromatics. 400. What aspects should be considered during the maintenance of atmospheric and vacuum distillation units?
Continuing: 401. Issue regarding the diameter of the main air duct; 402. Leakage problem in the reforming cooler; 403. Issue related to one of the heating furnaces; 404. A question for clarification; 405. Issue concerning the treatment of catalytic slurry; 406. Problem of sand holes in pipelines; 407. Issue of producing hydrogen from heavy oil; 408. Question regarding data on the long-term operation of catalytic units; 409. Catalytic-related issues; 410. Issue with the main catalytic fan; 411. Issue related to the startup of atmospheric and vacuum distillation units; 412. Issue with isolation valve assemblies; 413. Issue regarding the level of material in the regenerator! 414. Can the internal heat exchanger be used to adjust the amount of heat absorbed? (A very naive question.) 415. Issues related to catalytic diesel. 416. Problems with the preheating lines and valves for the slurry pumps and reprocessing pumps in catalytic cracking units. 417. Issues related to the alkaline washing of the regeneration gas in continuous reforming units. 418. How can people overcome the problem of pressure rise in towers? 419. What considerations should be taken into account when adding additives during the startup of catalytic units? 420. Issues related to online analysis of aromatic extraction and the use of storage tanks for this purpose. 421. What are the appropriate storage temperatures for straight-run wax oil, crude oil, and coking distillates? 422. Issues related to boiling range. 423. Problems with the burners in heating furnaces; please give some advice! 424. Issues concerning propylene in oil refining units. 425. Corrosion problems. 426. Seeking advice from experts regarding a raw material buffer tank. 427. Problems with hot spots in the bed of the residue hydrogenation refining reactor! 428. During the start-up and shutdown of atmospheric and vacuum distillation units, fellow engineers, how do you address the issue of steam water hammer? 429. The problem of oil stratification. 430. The issue of processing highly acidic crude oil in refineries. 431. Problems related to catalyst shutdown for maintenance. 432. Several issues with conventional centrifugal pumps. 433. Problems associated with diesel combustion. Urgent 434: Issues related to oil deodorization in vacuum distillation units. 435: Questions regarding oil storage tanks. 436: Another new issue has arisen. 437: Seeking advice from experts on the issue of circulation ratio. 438: Problems with cracks in high-temperature and high-pressure pipelines. 439: Issues related to the vacuum level in vacuum distillation for Daqing crude oil. 440: Problems related to reducing pressure drops in distillation systems. 441: What kind of problems have you encountered during your professional title defense? (Vacuum distillation units) 442: Issues related to thermal integration in refineries. 443: Problems with the tubes in hydrogen production conversion furnaces. 444: Has anyone encountered problems with ash accumulation in heating furnaces? 445: Issues related to catalytic waste heat boilers. 446: Problems caused by sticking of pump outlet valves! ! ! ! 447. Issues related to heat-resistant cement in sulfur recovery liquid sulfur tanks. 448. A question about liquefied gas. 449. Seeking help regarding hydrogenation issues. 450. Problems with aviation fuel not meeting corrosion resistance standards. 451. Issues concerning the products of coking distillation towers. 452. Questions related to hydrogen partial pressure. 453. Issues regarding the service life of heating furnace exhaust fans. 454. A newcomer seeking advice on diesel oil production. 455. Issues related to reprocessing coking wax oil. 456. Coking in the bottom reboiler and the use of temperature reducers. 457. {Expert! Please advise on the issue of liquid in the new hydrogen compressor used in hydrogenation!!!!!} 458. Issues related to water supply for coking processes. 459. Discussion on technological innovation in China’s refining industry. 460. Questions regarding water injection in distillation towers? 461. Issues related to external heat extraction 462. Analysis of problems occurring during the use of feed nozzles in catalytic unit risers 463. Economic aspects of wastewater reuse 464. Problems associated with coking and regeneration 465. Issues related to quench oil at the top of the coke tower 466. Problems with hydrogenation reactors 467. Issues concerning the blending of gasoline and diesel 468. Questions regarding the location of steam in case of main air system failures 469. Seeking expert help to resolve the problem of color change in gasoline and diesel 470. Problems associated with amine solutions used in long-term circulation 471. Issues related to decolorization and deodorization of tire pyrolysis oil 472. Problems with water addition during hydrogenation processes 473. Issues with acid and alkali storage tanks 474. A question for everyone: What kind of gaskets are generally used for the bolts on the top and bottom covers of coke towers? 475. Theoretical knowledge related to catalytic cracking 476. Issues related to liquefied petroleum gas displacement 477. A question about a concept in catalytic units; please don’t laugh at me 478. Problems related to pressure differential sensors in hydrogenation reactors 479. Issues related to the discharge of superheated steam 480. Problems with water content in the crude oil used in catalytic cracking 481. Questions regarding the heating process of crude oil in catalytic cracking? 482. Questions regarding the catalytic external slurry discharge? 483. Issues related to diesel hydrogenation reactors 484. Problems with soot blowing in catalytic residue boilers 485. An issue concerning the amine-rich liquid flash tank in hydrogenation units 486. Problems related to the media used in hydrogenation units 487. Operational issues with distillation towers 488. Operations of the overhead tank during normal production in atmospheric and vacuum distillation units 489. Issues related to the atomization steam for catalytic feedstocks 490. Problems with the media inside the pressure differential leads of hydrogenation reactors 491. Issues related to light hydrocarbon recovery units in refineries 492. Problems related to naphtha 493. Questions regarding gasoline hydrogenation 494. A question about hydrogenation processing 495. Issues related to fluidization in the degassing tanks in catalytic cracking units 496. Problems related to dry gas 497. Issues related to the discharge of residue oil 498. Wear problems with the three-screw unloading valves in catalytic cracking units 499. Issues related to false level indications on glass plate level gauges 500. Problems related to circulating water
Continuing: 501. Issues related to coking quench oil. 502. What problems did you encounter during the commissioning of your UOP reforming unit, and how were they resolved? 503. Problems with diesel stripping in the coking distillation tower. 504. Issues related to the operation of the propylene purification tower in the gas separation unit. 505. Problems with kerosene hydrogenation. 506. Issues related to heating up the plant during startup. 507. Problems with the main fan generating electricity. 508. Several issues related to catalysis. 509. Problems of excessive temperature rise in the hydrogenation reactor. 510. Airtightness issues. 511. Issues related to asphalt. 512. Problems with wet air coolers. 513. Issues regarding the control and impact of salt content in heavy oil used as catalyst feedstock. 514. Issues related to diesel blending. 515. Problems with Tower C-2 in the gas separation unit. 516. Questions regarding the cooling of residue oil (used as feedstock for coking). 517. Experts! I need advice on issues related to hydrogenation reactors!! 518. Issues related to refinery wastewater and rainwater. 519. Issues related to SE-6, “Golden Flame”, and “water turning into fire”. 520. Issues related to starting up hydrogen production processes. 521. Vibration problems in the high-pressure water injection lines used in the hydrogenation refining process for gasoline and diesel. 522. Problems existing in the reforming unit 523. Issues regarding the stripping tower in the reforming pretreatment section? 524. The acid value issue of oils and fuels. 525. Problems with steam extractors in turbines? 526. Issues related to the types of coke produced in catalytic cracking. 527. Pipeline flow rate issues. 528. Problems with the drainage from the top of atmospheric and vacuum distillation columns. 529. Issues related to the operation of heating furnaces. 530. Problems with heating furnaces. 531. Issues related to flares. 532. Problems with main fans. 533. Let’s discuss what aspects need to be considered during catalytic unit shutdowns Safe? Environmental protection? 534. Issues related to compressors. 535. Problems with the KP value of high-pressure air cooling in hydrogenation processes. 536. Issues concerning pellet coking in coking processes. 537. Acidity problems after diesel refining. 538. Problems with heat exchangers. 539. A question regarding the stabilization of gasoline. 540. I would like to ask about the issue of purge air in special valves! 541. The issue of sulfur content in hydrogenation feedstocks. 542. Issues regarding the conversion of oil tanks into methanol tanks! 543. Problem with inaccurate oil intake in the plunger pump on FFB. 544. Problems existing in the hydrogenation unit. 545. Operational issues related to the high-pressure heat exchanger in hydrogenation. 546. Issues related to paraffin refining. 547. Question: Issues concerning equipment foundations. 548. Problems with the reciprocating pump for coking steam. 549. Problems with the booster pump in the heavy oil catalytic unit? 550. Issues related to partial catalytic cracking. 551. Several problems with the hydrocracking reactor. 552. Issues regarding the sulfur and nitrogen content in the hydrorefined oil? 553. Coking issues in lift pipes 554. Insulation and leakage problems of high-pressure flanges in hydrogenation units 555. Discussion on the handling of hydrocracking accidents 556. Several issues related to the treatment of feed oil in hydrogenation processes 557. Issues concerning steam used in catalytic cracking 558. Problems related to the recovery of light ends gas from atmospheric and vacuum distillation units 559. Catalyst fluidization issues 560. Problems associated with impure diesel 561. Issues related to water used in catalytic cracking 562. Any discussions on the problems that arise when processing Sudan Dar crude oil? 563. Issues related to energy consumption in catalytic cracking. 564. Problems with the re-refined oil in the fractionation column of catalytic cracking units. 565. Several issues regarding hydrogen air cooling. 566. Problems with the air cooling system in hydrocracking reactions. 567. Issues concerning the hydrogen circulation system for desulfurization during hydrogenation. 568. Problems with the main air distributor in regenerators. 569. Seeking advice on how to address the issue of catalyst loss at both ends of a catalytic unit. 570. Issues related to the catalytic-to-reflux ratio and the re-refining ratio. 571. Problems with the color of the wash oil. 572. Instrumentation-related issues. 573. Problems encountered in small-scale oil refining operations. 574. What aspects should be considered when starting up a hydrogenation reactor? 575. Seeking advice on several issues related to hydrogenation units. 576. Issues related to fluidization in catalytic processes. 577. Problems with desulfurization in gasoline purification. 578. In practical technical training, it’s important not to ask questions without thinking first! 579. Problems encountered when using 93# gasoline. 580. Issues related to the production of hydrogen using crude gasoline and refined oil for high-platinum pellets in reforming units. 581. Problems with the downward feeding process outside the second regenerator in two-stage catalytic regeneration of heavy oil. 582. Hygiene issues during the maintenance of heavy oil pumps in various units. 583. Are there any new technologies (methods that allow catalytic units to avoid the need for preheating valves to address the preheating problem of heavy oil pumps)? 584. Erosion and wear of the valve stem ends in single-acting slide valves used in catalytic unit regeneration as well as in semi-regenerative single-acting slide valves. 585. Wear of the valve heads in check valves in catalytic cracking units. 586. Issues related to the refining of crude oil. 587. Problems related to the degassing tower in hydrocracking units. 588. Problem of coke powder being carried along with liquefied gas. 589. Issues related to quench oil? 590. Question regarding catalytic feedstock. 591. Question about adding alkali to acidic water. 592. Temperature issue in the distillation tower of coking? 593. Questions regarding salt formation in separation towers? 594. Insulation issues in coke towers 595. Seeking advice on the selection and material choice for the heavy oil preheating valves in catalytic units 596. Venting problems in gasoline and diesel hydrogenation units 597. The problem of babbitt shedding from the bearing shells of the high-speed shafts in catalytic cracking unit compressors 598. Issues related to coke oven hot water tanks 599. Several questions regarding hydrocracking products 600. Problems during compressor commissioning and operation