Innovative "prescriptions" for new devices-Daqing Petrochemical Refinery Technical Achievements Help Safe Production

Recently, in the 2021 technical achievements award list announced by Daqing Petrochemical Company, Guo Bin, a technician of 1.

Inert gas reduces the risk of corrosion

Due to the special process characteristics of the continuous reforming unit, the catalyst regeneration system needs to continuously inject a certain dose of perchloroethylene to maintain the catalyst activity.

Guo Bin introduced that the imported regenerative fan inlet pipes and condensate discharge pipes of similar devices have experienced multiple corrosion and leakage due to low temperature.

To this end, the reforming workshop carried out technical research, through the actual measurement of the root and dead zone temperature of the nozzle, and regenerative nitrogen was introduced at the position of the corrosive nozzle to blow away the corrosive flue gas in the area, and completely remove the hotbed of chlorine corrosion

"The workshop also adopts the same anti-corrosion measures to purge and protect the black burned line in the regeneration zone that has been corroded and perforated due to the missing heat tracing in the construction.

Limited heating with high efficiency

Two screw-type refrigeration compressors are installed in the contact section of the continuous reforming device, and two sets of electric heaters are designed in the oil separator to ensure the normal start of the unit

To solve this problem, they increased the oil temperature of the unit by encrypting the electric heating cable, but the design capacity of the electric heating system was limited

　　Guo Bin proudly said: "This technological transformation has completely solved the problem that outdoor units cannot be started at low oil temperatures in Northeast China, and it also provides unit manufacturers with experience in solving low-temperature start-up problems

　　Restricted orifice plate protects the continuous regeneration of the catalyst

　　Due to the low load and low reaction temperature of the reformer, the amount of coke deposited on the spent catalyst is about 2.

　　After repeated deliberation, the workshop decided to fill in nitrogen through the auxiliary line of the nitrogen solenoid valve, and set up a flow-limiting orifice on the auxiliary line to limit the amount of nitrogen to be filled

　　Li Jianfeng, a process technician in the workshop, said: “On the basis of the original control plan, a manual operator for split-range control of the amount of supplementary air was added to enable it to achieve a cascade of the inlet oxygen content and the amount of supplementary air in the scorching zone, and to individually control the thermal fan.