Non-Catalytic Ammonia Denitration Technique in the Iron Works

The non-catalytic ammonia denitration technique is a method to decompose and convert NOx into non-polluting substances by using ammonia as a reducing agent without catalysts. The merits of this method are its handiness and Jow equipment cost, only an ammonia spray system is needed. It doesn't need any catalyst device nor blower. In addition to the above merits, there is another advantage. When this method is applied in the integrated iron works, running cost is almost zero because liquid ammonia is produced as a by-product in large quantities in the refining process of coke oven gas (abbreviated as COG) (refer to Fig. 1) to be disposed of later. So there is virtually a inexhaustible supply of ammonia. We have been investigating the feasibility of this technique in the iron works, paying attention to these merits. The following is the report on our investigation of two case.