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Liu W.,Huadong Design Branch of China Petroleum Engineering and Construction Corporation | Sun G.,China University of Petroleum - Beijing | Hu M.,Luoyang Petrochemical Engineering Corporation
Petroleum Refinery Engineering | Year: 2012

The hazard of coking in FCCU equipment is described. It is pointed out that the condensed oil droplets formed by heavy components of reaction vapor is the internal cause of coking, while the reaction vapor' s surrounding condition is the external cause of coking. It is found out from the analysis of coke compositions and catalyst size distribution in coke that the hydrogen in coke is lower than 4 m% and the coke is mainly made of catalyst fins and highly condensed hydrocarbons. When the operation fluctuates and temperature in disengager changes, the coke block, affecting the catalyst circulation between reactor and regenerator, and the unscheduled shutdown of the unit is the final result. The effective measures to prevent the reactor system from coking is to eliminate "unvaporized oil" and "wet" catalyst. Properly increasing the reaction severity and decreasing the heavy distillation such as slurry oil in reaction vapor also proves to be an effective means for minimizing coking in equipment. The long-term smooth stable operation of FCC unit can be maintained by optimization of feedstocks, application of state-of-the-art technologies such as MIP/MIP-CGP and RICP, optimization of rough cyclone design, addition of pre-stripper for rough cyclone hopper, optimization of riser outlet connection, no slurry oil recycle and possibly minimizing recycle oil and practice of effective coking prevention and control measures such as standardization of start-up/shutdown procedures, etc. Source


Lan C.-H.,China National Petroleum Corporation | Sun Q.-Y.,Huadong Design Branch of China Petroleum Engineering and Construction Corporation | Zhang Y.,China National Petroleum Corporation | Zhang C.-F.,China National Petroleum Corporation | And 2 more authors.
Petrochemical Equipment | Year: 2013

The introduction is made for the design and application of reformate liquid chloride adsorption technology in 600 kt/a catalytic reforming unit in Qingyang Petrochemical Company, which provides good means to solve reformate chloride corrosion and jam. It is important to refineries that eliminate danger and meet long-term operation. Source


Yu J.,Huadong Design Branch of China Petroleum Engineering and Construction Corporation | Jiansheng R.,Huadong Design Branch of China Petroleum Engineering and Construction Corporation | Xueyun L.,Huadong Design Branch of China Petroleum Engineering and Construction Corporation | Xiaoping L.,Huadong Design Branch of China Petroleum Engineering and Construction Corporation | Dong C.,Huadong Design Branch of China Petroleum Engineering and Construction Corporation
Petroleum Refinery Engineering | Year: 2014

In a 900,000 TPY FCC gasoline hydrodesulfurization unit of a refinery, selective hydrodesulfurization process has been selected to reduce sulfur in FCC gasoline to meet 50 ppm specifications of sulfur in Guo IV gasoline. As the gasoline quality is upgraded rapidly, the design of the new FCC gasoline hydrodesulfurization units should ake into consideration not only meeting the Guo IV gasoline standard but also gradually meeting the Gua V gasoline standard of 10 ppm sulfur without changes of main equipment. The design of main equipment such as reactor and furnaces should satisfy the requirement of producing Guo V gasoline. The designs of recycle gas compressor and make-up hydrogen compressor are either capable of producing Guo V gasoline or Guo IV gasoline with foundation reserved for future upgrading to produce Guo V gasoline based upon sizes of the equipment. Source

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