Urea Technology Exchange Summary Post (II)--------Recycling Process
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1. Temperature of the binary tower (full circulation of aqueous solution): http://bbs.hcbbs.com/thread-377806-1-1.html2. What are the typical temperature and pressure levels of liquid ammonia fed into the system? http://bbs.hcbbs.com/thread-382664-1-2.html
3. Service life of the insulation stop valve at the inlet of the primary pump: http://bbs.hcbbs.com/thread-339625-1-2.html
4. What does the temperature of the binary gas phase indicate? (Complete circulation of aqueous solution method) http://bbs.hcbbs.com/thread-376108-1-2.html 5. Control measures for the temperature of the gas exiting one of the absorption towers during operation (complete circulation of aqueous solution) http://bbs.hcbbs.com/thread-342676-1-2.html 6. Opening degree of the gas-phase valves in the pre-separator (complete circulation of aqueous solution process) http://bbs.hcbbs.com/thread-379756-1-2.html 7. How to reverse the operation of the ammonia pump in this situation? http://bbs.hcbbs.com/thread-379801-1-2.html 8. The pressure in the circulation system is high; the cause is found to be a high CO2 content. What are some effective solutions? (CO2 stripping method) http://bbs.hcbbs.com/thread-373195-1-4.html 9. Can a silencer be installed on the vent pipe of the 4BAR absorption tower in the CO2 stripping process? http://bbs.hcbbs.com/thread-376780-1-4.html 10. Selection of material for liquid ammonia pipelines in the CO2 stripping method http://bbs.hcbbs.com/thread-357099-1-4.html 11. Does removing the high-level tank from the condensate water system have any impact on production? http://bbs.hcbbs.com/thread-308655-1-4.html 12. What are the reasons why the temperature of the liquid coming out of the distillation tower cannot be increased? (CO2 stripping method) http://bbs.hcbbs.com/thread-373171-1-4.html 13. The liquid level in the ammonia tank rises quite rapidly; what factors should be considered in this regard? (CO2 stripping) http://bbs.hcbbs.com/thread-374658-1-4.html 14. What is the impact of the amount of medium-pressure venting on urea production and consumption? http://bbs.hcbbs.com/thread-324138-1-5.html 15. Topic 3 on the full-circulation method for uR aqueous solutions: Discussion on the control of medium-pressure vent volume. http://bbs.hcbbs.com/thread-310234-1-5.html 16. When the concentration in the ammonia water tank gradually increases, what factors should be considered to identify the cause? http://bbs.hcbbs.com/thread-368218-1-5.html 17. Material of the pipes in the first absorption tower (full circulation of aqueous solution) http://bbs.hcbbs.com/thread-333202-1-5.html 18. Issues related to the operation of the first absorption tower (full circulation of aqueous solution) http://bbs.hcbbs.com/thread-323522-1-6.html 19. Problems with low-pressure pressure supplementation in the urea process (full circulation of aqueous solution) http://bbs.hcbbs.com/thread-330000-1-6.html 20. Why do the pipes in the LC302 bypass system vibrate? (Aqueous solution full circulation process) http://bbs.hcbbs.com/thread-321452-1-6.html 21. What should be done if the liquid level at the intermediate separation point cannot be lowered during urea production using water circulation? {Even with all auxiliary lines open and the pressure increased to 2.5 kilograms, the liquid level still cannot be lowered} http://bbs.hcbbs.com/thread-322763-1-6.html 22. What is the impact of medium pressure (in aqueous solutions)? http://bbs.hcbbs.com/thread-365317-1-6.html 23. If the urea content in the methylammonium solution is high, what signs can be used to identify this? (CO2 stripping method) http://bbs.hcbbs.com/thread-364724-1-7.html 24. How to determine whether a high-pressure ammonium methoxide pump is operating unstably by listening to its sound? http://bbs.hcbbs.com/thread-365309-1-7.html 25. Topic 2 on the full-circulation method using uR aqueous solution: What are the reasons for a significantly high urea content in one absorption tower, and what are the solutions? http://bbs.hcbbs.com/thread-310050-1-7.html 26. Operating parameters and precautions for the gas lift single-column tower http://bbs.hcbbs.com/thread-362909-1-7.html 27. Issues related to corrosion in the urea single-column tower (prizes for participants) http://bbs.hcbbs.com/thread-351211-1-8.html 28. What is the structure of the distributor in the bubbling section of the absorption column in the full-circulation aqueous solution method? http://bbs.hcbbs.com/thread-362911-1-8.html 29. What are the reasons for a high pressure difference in urea recovery? How should it be handled? http://bbs.hcbbs.com/thread-329291-1-8.html 30. Why does vapor come out of the urine tank? http://bbs.hcbbs.com/thread-359026-1-8.html 31. Differences between leaks in the urea evaporation heating section and those in the heat utilization section (full water solution circulation) http://bbs.hcbbs.com/thread-359195-1-8.html 32. Urea low-pressure condenser http://bbs.hcbbs.com/thread-321807-1-8.html 33. What impact does operation of the low-pressure system have on the medium-pressure absorption system? http://bbs.hcbbs.com/thread-357285-1-8.html 34. Issues regarding the heat exchange area of the low-pressure ammonium carbamate cooler! http://bbs.hcbbs.com/thread-289241-1-9.html 35. Scaling in the urea cycle heating elements http://bbs.hcbbs.com/thread-351479-1-9.html 36. Urgent help: Problem with the pump not working http://bbs.hcbbs.com/thread-305343-1-9.html 37. Regarding the timing for switching pumps in urea production http://bbs.hcbbs.com/thread-217076-1-9.html 38. What material is used for the heat exchangers in urea temperature adjustment systems? http://bbs.hcbbs.com/thread-272545-1-10.html 39. Is the temperature of the urea pre-separator normal? http://bbs.hcbbs.com/thread-343370-1-10.html 40. The gas phase temperature in the first urea column is high. http://bbs.hcbbs.com/thread-320310-1-10.html 41. The temperature of the ammonia preheater (full circulation of aqueous solution). http://bbs.hcbbs.com/thread-341438-1-11.html 42. The type of packing used in the CO2-stripped urea distillation column. http://bbs.hcbbs.com/thread-339920-1-11.html 43. What are the reasons for the low frequency of the dimethyl pump, and how should it be addressed? http://bbs.hcbbs.com/thread-340516-1-11.html 44. The issue of low methane cooling temperature in the production process using urea CO2 stripping http://bbs.hcbbs.com/thread-288943-1-11.html 45. Control of the top temperature in the medium-pressure absorption tower during the co-production process using the 52WTSNAM process and triamine units http://bbs.hcbbs.com/thread-258399-1-11.html 46. Where is the highest pressure in a fully circulating aqueous urea medium-pressure system? http://bbs.hcbbs.com/thread-321454-1-11.html 47. Medium-pressure absorption tower http://bbs.hcbbs.com/thread-338647-1-11.html 48. Discussion on the condensation method in the urea medium-pressure ammonia cooling system http://bbs.hcbbs.com/thread-337027-1-12.html 49. How to ensure the stability of the absorption tower http://bbs.hcbbs.com/thread-222966-1-12.html 50. High urea content in the urea system (full circulation of aqueous solution) http://bbs.hcbbs.com/thread-336899-1-12.html 51. Reasons for cracks in the hydraulic cylinder of the primary pump in full aqueous solution circulation http://bbs.hcbbs.com/thread-334582-1-12.html 52. Problems in the low-pressure system of the carbon dioxide stripping process http://bbs.hcbbs.com/thread-327079-1-12.html 53. Questions regarding low-pressure issues? http://bbs.hcbbs.com/thread-264740-1-13.html 54. Structure of the external cooler for urea absorption http://bbs.hcbbs.com/thread-321643-1-13.html 55. Problems with high-pressure pumps http://bbs.hcbbs.com/thread-299134-1-16.html 56. Issues related to the urea absorption tower http://bbs.hcbbs.com/thread-288371-1-18.html 57. Pressure measurement points in the first stage (aqueous solution) http://bbs.hcbbs.com/thread-288513-1-18.html 58. Temperature of the liquid at the bottom of the distillation tower http://bbs.hcbbs.com/thread-285446-1-19.html 59. Request for all information regarding the feed conditions for the distillation tower in Snamgiti urea synthesis process http://bbs.hcbbs.com/thread-283440-1-19.html 60. Pre-separator for low-concentration urea http://bbs.hcbbs.com/thread-259873-1-22.html 61. What method is used for measuring the liquid level in the medium-pressure absorption tower in urea production? http://bbs.hcbbs.com/thread-253149-1-22.html 62. Questions regarding the design of the low-pressure ammonium methoxide condenser http://bbs.hcbbs.com/thread-254035-1-23.html 63. Precautions for using the auto-stirred column in full-circulation urea production processes http://bbs.hcbbs.com/thread-134268-1-23.html 64. How to address the problem of excessive outlet temperature in the medium-pressure absorption tower for urea production? http://bbs.hcbbs.com/thread-216195-1-23.html 65. Appropriate temperature control for the first-stage liquid temperature http://bbs.hcbbs.com/thread-99970-1-23.html 66. Methods for dealing with overheating in the first absorption tower in small urea production plants http://bbs.hcbbs.com/thread-247514-1-23.html 67. Fluctuations in the liquid level of the second separation tower in urea production? http://bbs.hcbbs.com/thread-60755-1-23.html 68. Problems related to liquid level in the first separation zone http://bbs.hcbbs.com/thread-226014-1-26.html 69. Temperature control for the first absorption tower http://bbs.hcbbs.com/thread-201690-1-26.html 70. Why is the centrally controlled display value of the liquid level in the medium-pressure absorption tower unreliable during startup? http://bbs.hcbbs.com/thread-220737-1-26.html 71. Does the concentration of Monomer A affect the temperature in the synthesis tower? http://bbs.hcbbs.com/thread-205964-1-26.html 72. What is the reason for the higher steam consumption after replacing the packing in the urea second-stage decomposition tower with structured packing? http://bbs.hcbbs.com/thread-136075-1-28.html 73. What are the reasons for the corrosion of the arc-shaped liquid drop tray in the pre-distillation tower? http://bbs.hcbbs.com/thread-198470-1-28.html 74. Determination of the heat exchange area of the low-pressure ammonium carbamate condenser http://bbs.hcbbs.com/thread-143270-1-30.html 75. Reasons for high liquid level in the first absorption tower for urea production and ways to address it http://bbs.hcbbs.com/thread-102990-1-35.html 76. Key points to note when using a self-aeration tower in the production of aqueous urea http://bbs.hcbbs.com/thread-88065-1-36.html 77. Where are tanks used in urea production? http://bbs.hcbbs.com/thread-237609-1-40.html Posts as of February 7, 2009 have been compiled; please check them out. This post was last edited by lxq700918 on 2009-2-7 23:29.]