Ammonia nitrogen processing method in processing of waste gas of chemical fertilizer plant

Abstract

The invention discloses an ammonia nitrogen processing method in processing of waste gas of a chemical fertilizer plant. The processing method includes first absorbing waste gas in an absorption tower through orthophosphate, then utilizing a lifting pump to absorb ammonia till diammonium hydrogen phosphate is completely produced, introducing the diammonium hydrogen phosphate into an ammonia still provided with Bi-Be-Ga-Gd-Ho-Tm-Os / alpha-SiO2 through a pipeline, adding an organic denitrification agent, and finally introducing stream into the ammonia still to enable ammonium dihydrogen phosphate and ammonia gas to be decomposed. The ammonia gas is reduced into nitrogen gas under the effect of the catalyst, the ammonium dihydrogen phosphate is delivered to the top of the absorption tower through a circulation pump, and then ammonia gas in waste gas in the pipeline is absorbed again. The ammonia nitrogen processing method of waste gas in the chemical fertilizer plant utilizes phosphoric acid as the absorbent which is continuously absorbed and desorbed in recycle mode, utilizes organic denitrification agent and heavy metal catalyst to completely decompose the ammonia gas and quickly convert the ammonia gas into the nitrogen gas, and avoids secondary pollution to air.

Description

technical field [0001] The invention relates to a method for treating ammonia nitrogen in waste gas of a chemical fertilizer plant in Yihe, and belongs to the field of waste gas treatment. Background technique [0002] Most of the exhaust gas discharged from the fertilizer plant is ammonia gas, which has a pungent odor, is harmful to the respiratory system, and is prone to acute respiratory diseases. Ammonia (NH3) has corrosive and irritating effects on the skin tissue in contact. Excessive gas, resulting in excessive ammonia concentration in the blood, will cause cardiac arrest and respiratory arrest through the reflex action of trigeminal nerve endings, which is life-threatening. There are also toxic trace organic pollutants, carcinogenic effects, environmental hormones. [0003] At present, the treatment methods of ammonia nitrogen in exhaust gas generally adopt absorption method and catalytic combustion method. The absorption method uses water or dilute sulfuric acid t...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems of impurity in the products obtained in the prior art when treating ammonia nitrogen in waste gas, and the problem that the removal of nitrogen and the risk of secondary pollution are not completely solved in essence, the present invention provides a method for treating ammonia nitrogen in waste gas of chemical fertilizer plants, using phosphoric acid as The absorbent can be recycled in the process of continuous absorption and desorption, and the organic denitrification agent is used to make it more completely desorb the ammonia and quickly reduce it to nitrogen, avoiding secondary pollution to the air and solving the problem of high consumption and high cost