Feasibility study and suggestions on replacing sulphuric acid method with phosphoric acid method for treating ammonia waste gas
The technical principles and process flows of sulphuric acid and phosphoric acid methods for treating ammonia containing waste gas are introduced.The sulphuric acid method uses sulphuric acid as a removal agent,and produces ammonium sulfate after washing and absorbing ammonia in a saturator or acid washing tower.The phosphoric acid method uses phosphoric acid as a removal agent to react with ammonia in the absorption tower to generate monoammonium phosphate,which is then further absorbed to generate diammonium phosphate.After the ammonium phosphate is desorbed in the desorption tower,it is converted into monoammonium phosphate and returned to the absorption tower for recycling.The desorbed ammonia is condensed to produce ammonia water.The economic,safety,and environmental friendliness of the two methods are analyzed and evaluated,and the results indicate that the phosphoric acid method is superior to the sulphuric acid method.The feasibility of using phosphoric acid method instead of sulphuric acid method to treat ammonia containing waste gas is explored from the adaptability of raw materials,process,and equipment,and corresponding technical improvement measures and suggestions are proposed.
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