NITROUS RAIL GASES LOW-TEMPERATURE CATALYTIC PURIFICATION PROCESS CONTROL METHOD Russian patent published in 1995 - IPC

FIELD: nonorganic chemistry. SUBSTANCE: method involves calculating degree of purification of gases in reactor from measured values of temperature in reactor and flow rate of nitrous gases into absorbing column; calculating content of nitrogen oxides in gas at output of absorbing column depending on medium temperature in absorbing column; calculating optimum content of nitrogen oxides in tail gases exiting from reactor from calculated values of degree of purification of gases in reactor and content of nitrogen oxides in gas at output of absorbing column; comparing calculated optimum content of nitrogen oxides in tail gases exiting from reactor with measured value and regulating feeding of ammonia into reactor in accordance with obtained value of deviation. Method is characterized in that it involves additional measuring of content of ammonia in tail gases exiting from reactor; calculating content of nitrogen oxides in gas at output of absorbing column in accordance with rate of flow of nitrous gases into absorbing column; comparing measured value of ammonia content in tail gases exiting from reactor with predetermined specified value and determining deviation value; regulating of feeding ammonia into reactor depending on obtained deviation value, calculated optimum content of nitrogen oxides in tail gases exiting from reactor and rate of flow of nitrous gases into absorbing column. EFFECT: improved quality of purification of gases. 1 dwg