Problems with benzene washing towers
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Our unit’s benzene washing tower has been in operation for over two years; due to an excessive increase in resistance, we adopted the method of shutting down the tower and using steam for purging. As a result, a large amount of brown residue was blown out of the tower; however, after the benzene washing tower started operating, it was observed that the amount of oil used for washing decreased. (The packing in the tower consists of stainless steel corrugated perforated plates.) By checking the condensate and the water seal of the benzene washing tower, it was found that oil for washing was present in the water seal of that tower, but not elsewhere. I would like to ask everyone whether prolonged use of steam cleaning has caused the packing to become disordered, or if there are any issues with the packing. This results in poor oil capture performance in the mist-catching section of the benzene washing tower. There must be other reasons; please help analyze them!
What filler do you use in the fog capture section? The purging process must have blown out the packing, resulting in poor oil trapping performance in the mist capture section of the benzene washing tower. The mist capture section of the benzene tower needs to be repaired. Rearrange it.
The loss of washing oil is likely due to it being carried away by the gas, which requires an improvement to the demister. Prevent entrainment.
"\"A large amount of brown residue is blown out of the tower,\" which indicates severe corrosion inside the tower as well as the shedding of internal components.
It’s brown oil residue, not rust residue.
What type of packing is used in the mist capture section of the benzene washing tower developed in Tianjin?
As the resistance of the packing layer decreases, the gas velocity of the coal stream increases. Open the packing in the fog capture section and check for any signs of segregation. The tower packing is a stainless steel corrugated perforated plate; this type of packing has no other problems aside from clogging. Based on my experience, I recommend installing an oil filtration unit. Hebei Yutai has used it; it was made by a boss from Shandong.
Does blowing steam through the tower have an impact on the packing?
The original post was published by fangfei*nsheng on 2009-3-24 at 17:27. What kind of packing is used in the fog-catching section of the benzene washing tower developed in Tianjin? [/quot] The degassing tower in our factory uses a unit manufactured by Tianjin Chuangju; the pressure at the direct steam outlet is 560 mm lower than that at the lean liquid outlet, and we haven’t had time to carry out any modifications yet.
What are the packing materials used in the fog-catching section of the benzene washing tower?
Stainless steel packing may fall apart; this issue occurred at the coking plant of Shanxi Dongfang Resources Company
Complex salts such as (NH4)2{Fe6]} turn reddish-brown after being dissolved in washing oil; the washing oil remains reddish-brown for some time after evaporation, and gradually turns dark blue over time. You can take some of the brown residue and burn it; after burning, it turns into iron oxide trioxide, which is reddish-brown in color. Either take some brown residue and let it dry for a long time to see if it turns into dark blue powder; this is (NH4)2{Fe6]}. It is white in the absence of oxygen, turns dark blue when exposed to oxygen, and becomes reddish-brown after burning, forming iron oxide. Is the desulfurization and denitrification process in your plant operating stably? Are the ammonia and sulfur levels in the gas after purification within the specified limits? It seems that the benzene washing tower in your plant is quite clogged, which is similar to the situation in our plant at that time. At that time, our plant operated the benzene extraction process without using desulfurization and denitrification methods; it took two years before severe blockages occurred in the benzene extraction tower. Steam purging as well as cleaning with oil-containing ammonia solutions proved ineffective, so we had no choice but to manually clean the fillers in the tower. This task took 20 days to complete, and it was a very tough job. This post was last edited by Dylan_soi on 2009-3-26 13:11]
What is the impact of desulfurization on the benzene washing tower? Our plant uses post-desulfurization
Recently, it was found that there is a significant lack of oil in the system; moreover, there is oil in the water seal after passing through the benzene washing tower. Please suggest some solutions
By the way, has there been any coal gas breakthrough in the U-tube of the rich oil tank in the benzene washing tower? What is the height of the U-tube in that unit? In our factory, it is two meters
The water seal at the bottom of the benzene washing tower could be punctured.
Post-desulfurization will definitely cause corrosion to the benzene washing tower. Corrosion leads to tower blockage. I wonder what material you use for the packing in your fog capture section? ? There are indeed examples of steam purging causing damage to the packing in the mist capture section. However, they use polypropylene sheet corrugations. The fog capture section does not work well; a lot of mist is carried along, which increases your oil consumption.
If steel mesh filler is used, and the quality of the washing oil is fine, it’s necessary to check whether something brought in from the ammonium sulfate processing stage reacts with the washing oil, resulting in the formation of impurities; there is no problem with using steam to purge the steel mesh filler
The main reason for the high resistance in the benzene washing tower is the increase in tower pressure caused by fouling of the packing; therefore, it is necessary to clean the packing. We employed our proprietary cleaning technology (a two-step process using water-based cleaners) to clean the benzene washing tower at a certain coking plant, resulting in tower pressure levels that met the process requirements. The cleaning process took 10 days, was safe and efficient, and saved 60% on costs compared to replacing the packing. To date, the tower has been operating normally for 5 months, with evident improvements – successfully resolving the issue of high resistance that affected the normal operation of the system. For details, please contact Mr. Zhao at 13703586895.
Tianjin Chuangju Technology Co., Ltd. uses our company’s proprietary technology – the H-type demister – in its benzene washing towers, and the results are excellent.
The water seal behind the benzene washing tower contains washing oil; an oil-water separator is installed after the water seal to recover this washing oil. This issue occurred in our company; by adding an oil-water separator, we were able to recover a significant amount of wash oil.