Process Optimization Of Liquid Nitrogen Washing And Its Application In Synthetic Ammonia Production

Liquid nitrogen washing device is used for final purification process of synthetic ammonia raw gas. The purpose is to further removed the remaining CO, and CH4 after methanol washing, so that the concerntration of CO in it is less than or equal to 1ppm. And the purified gas was proportioned with nitrogen to make the ratio of H2 to N2 reach 3:1 to meet the demand of ammonia synthesis gas.The thesis based on the energy saving modification of ammonia production device in Sinochem Jilin Changshan Chemical Co. Ltd. This thesis designed the flow sheet of feed gas purification process using liquid nitrogen wash process, combined with the practical experience of liquid nitrogen wash technology application and actual situation, the design calculations and types selection for the key equipments of the liquid nitrogen washing process,such as washing tower, heat exchangers has been conducted and evaluation of technical and economic data of the process was finished, and implementation of its Indus-trial applications, has achieved remarkable economical and social benefits.the device has been stable operation put Since it is put into operation with the CO in purified gas being less than or equal to 1ppm, H2 loss of per ton of ammonia dereased 35.8Nm3, annual benefit is 6444200 yuan.