METHOD AND APPARATUS FOR CONTROLLING GASEOUS HYDROLYSIS PRODUCTION

摘要

A reaction vessel (368) comprises a liquid level of urea solution and a gaseous hydrolysis product having a gas ratio which contains at least some amount of ammonia gas. The production of the gaseous hydrolysis product is controlled by raising the liquid level of the urea solution within the reaction vessel (368) to increase the rate of gaseous hydrolysis product production. The level of urea solution within the reaction vessel (368) is lowered to decrease the rate of gaseous hydrolysis product production. The pressure of the reaction vessel (368) is also controlled to help maintain the gas ratio produced during transient changes to the reactors operating conditions.