The temperature in the liquid nitrogen washing layer (between the second and third heat exchanger layers) is high
Thread Content
The 300,000-ton synthetic ammonia plant utilizes water-coal slurry gasification, sulfur-resistant shift reaction, Dalian University of Technology’s low-temperature methanol washing process, liquid nitrogen washing, and the Cassali ammonia synthesis technology. During the operation of the cryogenic tank, an excessively low temperature was observed between the second and third heat exchangers; the fuel gas pipeline reached -160 degrees, the washed syngas pipeline also dropped to around -160 degrees, while the other pipelines were all below -140 degrees. What is the reason? How to handle it? Help! ! ! :handshake
Reduce the amount of liquid nitrogen used for washing and the amount of liquid nitrogen replenished
It is estimated that the amount of liquid is too large (such as a high methane content in the feed gas); therefore, while ensuring sufficient cooling capacity, measures such as appropriately reducing the amount of nitrogen used internally and increasing the amount of nitrogen used for washing, so as to increase the volume of syngas cooled by methanol washing, should be taken
Reduce the nitrogen amount used for washing, adjust the nitrogen amount for preliminary preparation, and reduce the amount of waste liquid discharged