Amino exhaust smoke purifying method and amino exhaust smoke purifying device

Abstract

The invention relates to an amino exhaust smoke purifying method and an amino exhaust smoke purifying device, used for removing aerosol and ammonia escape. The amino exhaust smoke purifying device comprises a washing tower, a purifying tower, a washing circulation tank and a crystal growing tank; exhaust smoke enters the washing tower at first, so that the temperature of the exhaust smoke is lowered and the exhaust smoke absorbs strongly acidic gas; then, the exhaust smoke enters the subsequent purifying tower to absorb weakly acidic gas. The amino exhaust smoke purifying device is characterized in that a dilute ammonium sulphate aqueous solution is used in the purifying tower; the concentration is 5-40%; the pH is 5.3-6.3; thin serous fluid containing ammonium sulphate crystalline solids is used in the washing tower; the solid content of ammonium sulphate is less than 10%; the pH is 1.0-4.5; furthermore, the proportion of the flow of sulphur to the flow of circulation solution in the purifying tower is 50-500 (g / h) / (m3 / h); and the proportion of the flow of circulation solution in the washing tower to the flow of the exhaust smoke is 1.0-10.0 (L / h) / (Nm3 / h). Therefore, the two processes deciding formation of aerosol and ammonia escape are decoupled and controlled effectively; and thus, the whole purifying system is also more safe and reliable to operate and control.

Description

Technical field The invention relates to a purification method and device for ammonia exhaust fumes, in particular to a purification method and device for producing ammonium sulfate fertilizer by recovering sulfur oxides from flue gas using ammonia as a raw material. It belongs to the technical fields of electric power, metallurgy, environmental protection and chemical engineering, and is particularly suitable The field of smoke purification. Background technique The acidic gaseous harmful substances contained in flue gas, especially SO 2 It is the main source of acid rain. It is well known that one solution to acid rain pollution is to purify smoke. The existing exhaust gas purification method is mainly calcium-based purification with limestone as raw material. The purification product is calcium sulfate (or purified gypsum), which can be used as building materials, including gypsum board and cement additives. However, due to China's gypsum resources It is relatively abunda...

AI Technical Summary

Problems solved by technology

The technical problem to be solved in the present invention is to disclose a novel method for purifying ammonia smoke exhaust, so as to solve the serious problem of weakly acidic and strongly acidic aerosols in the prior art, and at the same time ensure more effective control of the escape loss of ammonia , and higher ammonia feedstock utilization

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