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Ammonia-ammonium sulphate wet-method flue-gas desulfurization and ammonium sulphate recovery technique using induced crystallization

A technology of wet flue gas desulfurization and induced crystallization, which is applied in the environmental field, can solve the problems of high production cost of ammonium sulfate recovery, low ammonia utilization rate, and low cost of recovery ammonium sulfate, so as to reduce steam consumption, save operating costs, and reduce The effect of energy consumption

Inactive Publication Date: 2009-05-06
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems of low ammonia utilization rate and high production cost of ammonium sulfate recovery in the existing ammonia desulfurization technology, the present invention proposes a process for ammonia-ammonium sulfate wet flue gas desulfurization and induced crystallization to recover ammonium sulfate. The design of the process flow is reasonable , high ammonia utilization rate, less aerosol in the purified flue gas, low cost and high quality of ammonium sulfate recovery, stable and reliable desulfurization system, high desulfurization efficiency

Method used

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  • Ammonia-ammonium sulphate wet-method flue-gas desulfurization and ammonium sulphate recovery technique using induced crystallization

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Experimental program
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Effect test

Embodiment 1

[0029] The flue gas temperature is 150℃, the imported SO 2 The concentration is 2000ppm, the saturated ammonium sulfate solution is used as the absorption liquid, the pH value of the absorption liquid in the circulating tank is 5, and the liquid-to-gas ratio to the flue gas is 3.0L / m 3 , The amount of the bottom effluent returning to the desulfurization absorber accounts for the percentage of the total exhaust, that is, the reflux ratio is 90%, and the seed crystal is induced to be an appropriate amount of SiO 2 .

[0030] After the entire system runs, the flue gas desulfurization efficiency reaches 90%, and the purity of ammonium sulfate is 95%.

Embodiment 2

[0032] The flue gas temperature is 130℃, imported SO 2 The concentration is 4000ppm, the saturated ammonium sulfate solution is used as the absorption liquid, the pH value of the absorption liquid in the circulating tank is 5.2, and the liquid-to-gas ratio to the flue gas is 5.0L / m 3 , The amount of the bottom effluent returning to the desulfurization absorber accounts for the percentage of the total exhaust, that is, the reflux ratio is 95%, and the induced seed crystal is an appropriate amount (NH 4 ) 2 SO 4 .

[0033] After the entire system runs, the flue gas desulfurization efficiency reaches 93%, and the purity of ammonium sulfate is 92%.

Embodiment 3

[0035] The flue gas temperature is 140℃, the imported SO 2 The concentration is 1500ppm, the saturated ammonium sulfate solution is used as the absorption liquid, the pH value of the absorption liquid in the circulating tank is 5.5, and the liquid-to-gas ratio to the flue gas is 1.5L / m 3 , The amount of the bottom effluent returning to the desulfurization absorber accounts for the percentage of the total exhaust, that is, the reflux ratio is 85%, and the seed crystal is induced to be an appropriate amount of SiO 2 , (NH 4 ) 2 SO 4 , CaCO 3 mixture.

[0036] After the entire system runs, the flue gas desulfurization efficiency reaches 94%, and the purity of ammonium sulfate is 90%.

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Abstract

The invention discloses a technology of desulfurizing an ammonia-ammonium sulfate wet flue gas and inducing crystallization to recover the ammonium sulfate. The technology comprises the following steps: ammonium sulfate solution is used as an absorbent to contact with the flue gas; sulfate dioxide in the flue gas is dissolved and absorbed; the absorbent absorbing the sulfate dioxide reacts with ammonia to generate ammonium sulfite; after the ammonium sulfate is generated by oxygenization, crystallization is induced; ammonium sulfate crystals are recovered; and the ammonia is not used for desulfurizating the absorbent, which enhances the using efficiency of the ammonia and reduces the escaping of the ammonia. In addition, in the process of the crystallization of the ammonium sulfate, the method for inducing crystallization is used for reducing the evaporation using amount in the traditional technology and accelerating the crystallization speed, which not only saves the operation cost and reduces the energy consumption, but also enhances the stability and reliability of the system.

Description

Technical field [0001] The present invention belongs to the field of environmental technology, and relates to a flue gas treatment process, in particular to an ammonia-ammonium sulfate wet flue gas desulfurization process used to eliminate flue gas pollution generated by fossil fuel combustion and induce crystallization to recover ammonium sulfate Craft. Background technique [0002] Among the existing flue gas desulfurization technologies, the ammonia desulfurization technology recovers sulfuric acid, sulfur dioxide, ammonium sulfate, ammonium sulfite and other products while desulfurizing, and realizes the recycling and utilization of sulfur resources without any secondary pollution. It is green and clean. technology. Therefore, ammonia desulfurization technology, as a flue gas desulfurization process that is economically feasible, efficient, and capable of recovering sulfur resources, not only conforms to my country's current national conditions, but also has broad market appl...

Claims

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Application Information

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IPC IPC(8): B01D53/50B01D53/78
Inventor 吴忠标刘越王海强盛重义金瑞奔唐念王岳军俞丹青娄伟张佳莉
Owner ZHEJIANG UNIV
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