Liquid-phase hydrogenation feed preheating system and process

Abstract

The invention relates to a liquid-phase hydrogenation feeding preheating system and process. The system is characterized in that the top end of a first thermal separator is in reflux connection with athird liquid-phase heat exchanger and a third gas-phase heat exchanger; the third gas-phase heat exchanger is connected to a gas-phase reactor; the top end of the gas-phase reactor is connected to asecond liquid-phase heat exchanger and a second gas-phase heat exchanger; the second gas-phase heat exchanger is connected to a second heat separator, the top end of the second heat separator is connected to a first liquid-phase heat exchanger and the first gas-phase heat exchanger, the first gas-phase heat exchanger is connected to a cold separator, and the top end of the cold separator is connected to a liquid-phase feeding pipe and a gas-phase feeding pipe through a compressor. The system is scientific and reasonable in structural design and safe to operate, liquid-phase feeding and gas-phase feeding can be subjected to countercurrent heat exchange preheating respectively to reach the required temperature, technological parameters are guaranteed, damage to a heating furnace is small, the phenomena of coking, scaling and the like are avoided, and operation safety is guaranteed; meanwhile, heat and hydrogen can be effectively recycled, and the energy utilization rate is increased.

Description

technical field [0001] The invention belongs to the technical field of liquid-phase heavy oil hydrogenation, relates to liquid-phase hydrogenation feed preheating, in particular to a liquid-phase hydrogenation feed preheating system. Background technique [0002] For the hydrogenation process of liquid-phase feed such as heavy oil from oil shale and tar sands, atmospheric residue, coal tar or bitumen, the feed needs to be heated to the temperature required by the liquid-phase reactor through a heating furnace. Therefore, the heating furnace is an important key equipment in any liquid-phase hydrogenation reaction. Since the liquid-phase reactor requires a higher reaction temperature, and the feed needs to be mixed with hydrogen, the partial pressure of hydrogen in the furnace tube of the heating furnace is relatively high. , the pipe wall temperature and total pressure are correspondingly high, which will limit the raw materials for the liquid-phase hydrogenation process. ...

AI Technical Summary

Problems solved by technology

Therefore, the heating furnace is an important key equipment in any liquid-phase hydrogenation reaction. Since the liquid-phase reactor requires a higher reaction temperature, and the feed needs to be mixed with hydrogen, the partial pressure of hydrogen in the furnace tube of the heating furnace is relatively high. , the pipe wall temperature and total pressure are correspondingly high, which will limit the raw materials of the liquid phase hydrogenation process

[0003] In addition, because the heating feed includes multiphase flow of gas, liquid and solid, there are great uncertainties in the design of the heating furnace, the calculation of pressure loss and heat transfer, and the high temperature and easy wear are very unfavorable to the use of the heating furnace

[0004] Due to the harsh feeding conditions, the heating furnace is likely to cause scaling inside the furnace tube and coking of products in the tube. The heating time of the feeding material in the heating furnace is limited, and it is easy to cause the furnace tube to break, etc., and the safety of the process operation is poor.

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