PRODUCTION OF AQUEOUS SOLUTION OF AMMONIA

摘要

PROBLEM TO BE SOLVED: To provide a method for simply synthesizing ammonia as an inexpensive denitration reducing agent from hydrocarbon of fuel and air without using a specific raw material at the place where denitration is made. SOLUTION: A synthetic gas consisting essentially of hydrogen and nitrogen is circulated between an ammonia synthetic reaction column 21 and a wet type recovery column 22 for the produced ammonia and ammonia produced in the reaction column 21 is continuously wet-recovered in the recovery column 22. In such a case, the synthetic gas consisting of crude hydrogen and nitrogen is injected to a circulating gas between the outlet of reaction column and the inlet of the recovery column and impurities such as catalyst poisons due to the crude hydrogen is recovered and removed as an ammonium salt in the wet recovery column 22. In the circulation line of the synthetic gas, a heat exchanger 23 for heat exchanging between the high temp. reaction column outlet gas and the low temp. recovery column outlet gas is preferably provided.