How to recover off-gas from liquid ammonia

Liquid ammonia is a dangerous chemical, if not operated properly may bring danger, or even an explosion, not only in the use of operation should pay attention to, the same in the packaging, storage and transportation should pay more attention to the use of cylinders or tanker filling. Filling cylinders or tankers should be in line with the Labor Bureau issued the “cylinder safety monitoring regulations” “pressure vessel safety monitoring regulations” and other relevant provisions. Allowable weight filling coefficient is 0.52kg/L.

Cylinders and tankers for shipping liquid ammonia must comply with the “Dangerous Goods Transportation Rules” formulated by the Ministry of Transportation of the People's Republic of China, and should avoid being heated in the process of transportation, and smoke and fire are strictly prohibited. Cylinders must have a safety cap, outside the bottle with a rubber band or grass rope wrapped to prevent violent impact and vibration. Liquid ammonia cylinders should be stored in the warehouse or on the platform with a shed. When stacked in the open, it should be covered by a tent to prevent direct sunlight. It is mainly transported by railroad and road.

Liquid ammonia finishing process has exhaust emissions, its composition has water vapor, air and ammonia, of which ammonia is a harmful gas, affecting health and pollution of the environment, in order to reduce emissions, strengthen the recycling, on the one hand, can reduce costs, on the other hand, can protect the environment. Liquid ammonia finishing process has exhaust gas discharge, its composition has water vapor, air and ammonia, of which ammonia is a harmful gas, affecting health and pollution of the environment, to reduce emissions, strengthen the recycling, on the one hand, can reduce costs, and on the other hand, can protect the environment. The following Hongchang Liquid Ammonia will introduce several methods of liquid ammonia gas recovery:

Recovery of ammonia has absorption method, the gas from liquid ammonia finishing machine, through the pipeline to the recycling device of the scrubber tower (absorption tower), the ammonia mixed with air in this tower water absorption into ammonia, at this time the air is cleaned and discharged out of the tower, and then through the distillation tower will be separated from the ammonia and water, ammonia is absorbed by distillation made of concentrated ammonia, concentrated ammonia distillation that is concentrated ammonia, then concentrated ammonia through the compressor pressurization and condensing Then the concentrated ammonia gas is pressurized and condensed by the compressor into liquid ammonia, which is fed into the storage tank.

In the ammonia recovery device, there is an exhaust port at the top of the scrubber tower to control the ammonia content in the discharge gas, which should be lower than the environmental requirements.