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Desulfurization method for coke oven tail gas

A technology for coke oven tail gas and tail gas, which is applied in separation methods, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of unoptimized access and distribution, low desulfurization efficiency, and insufficient ammonium sulfate efficiency, and can prevent ammonia Escape, the effect of improving desulfurization efficiency

Inactive Publication Date: 2017-11-10
北京晨晰环保工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The main problem existing in the existing ammonia desulfurization technology using the above principle is: the desulfurization efficiency is not high because the feeding and distribution of ammonia water in the desulfurization tower are not optimized; Ammonium sulfite is oxidized outside the desulfurization tower, and the conversion efficiency of ammonium sulfite to ammonium sulfate is not high enough

Method used

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  • Desulfurization method for coke oven tail gas
  • Desulfurization method for coke oven tail gas
  • Desulfurization method for coke oven tail gas

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0037] Example 1: Desulfurization Tower Treatment of Coke Oven Tail Gas

[0038] figure 1 The desulfurization tower 2 is divided into three layers from bottom to top: spray layer 3, cleaning layer 4, and demister layer 5. The heights of the three layers are 14m, 0.5m, and 6m respectively.

[0039] At the bottom of the spray layer 3 in the lower part of the desulfurization tower 2, the coke oven tail gas (the tail gas produced by the combustion of the coke oven, wherein the sulfur dioxide content is 500mg / Nm 3 ), the top of the spray layer 3 is evenly atomized and sprayed into the ammonium sulfite solution, so that the coke oven tail gas and the ammonium sulfite solution come into contact with countercurrent to react. SO in coke oven exhaust gas 2 The acid gas reacts with the ammonium sulfite solution to generate ammonium bisulfite and enters the tower bottom effluent, and the dust and ammonia entrained in the coke oven tail gas are also washed down. The effluent from the bo...

Embodiment 2

[0048] Example 2: Pre-desulfurization treatment of coke oven tail gas

[0049] Before the coke oven tail gas is passed into the desulfurization tower of embodiment 1, it is first passed into the pre-desulphurization tower 1 from the bottom, and reacts countercurrently with the ammonium sulfite solution passed from the top of the pre-desulphurization tower 1. The height of the pre-desulphurization tower is (27m) . The coke oven tail gas exported from the top of the pre-desulfurization tower 1 is further passed into the desulfurization tower for desulfurization. Table 2 below shows the pre-desulfurization effect of coke oven tail gas under different treatment conditions.

[0050] Table 2 Pre-desulfurization effect of coke oven tail gas under different treatment conditions

[0051]

Embodiment 3

[0052] Example 3: Conversion and oxidation treatment of the desulfurization tower bottom effluent

[0053] When the total mass percent concentration of ammonium sulfite and ammonium bisulfite in the bottom effluent of the desulfurization tower in Example 1 reaches 20%, part of the bottom effluent of the desulfurization tower is sent to the static mixer through a circulating pump. In the static mixer, the pH value of the mixed solution is adjusted by controlling the amount of ammonia water added, thereby converting the ammonium bisulfite in the bottom effluent of the desulfurization tower into ammonium sulfite. The converted solution is successively sent to the two-stage oxidation tank for oxidation, thereby oxidizing ammonium sulfite to ammonium sulfate.

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Abstract

The invention belongs to the technical field of tail gas desulfurization and relates to a desulfurization method for coke oven tail gas. The desulfurization method for the coke oven tail gas comprises the following steps: introducing the coke oven tail gas from a spraying layer 3 positioned at the lower part of a desulfurization tower, and then uniformly atomizing and spraying an ammonium sulfite solution from the top of the spraying layer 3, thus enabling the coke oven tail gas to make countercurrent contact and react with the ammonium sulfite solution; finally, pumping back effluent discharged from the bottom of the desulfurization tower into the desulfurization tower through a circulating pump for carrying out circulation; adjusting a pH value of the whole cycle system by ammonium hydroxide added from the bottom of the desulfurization tower. Compared with an existing desulfurization method for the coke oven tail gas, the desulfurization method for the coke oven tail gas, disclosed by the invention, has the advantage that the desulphurization efficiency can be obviously improved.

Description

technical field [0001] The invention belongs to the technical field of tail gas desulfurization, and relates to a desulfurization method of coke oven tail gas. Background technique [0002] The coke oven exhaust gas contains sulfur dioxide, sulfur trioxide and various dust substances, and direct discharge into the air will cause serious pollution to the atmospheric environment. Therefore, coke oven tail gas must be treated, especially after desulfurization treatment, before it can be discharged into the air. Ammonia desulfurization is an important method of coke oven tail gas desulfurization. Its principle is to remove sulfur dioxide in coke oven tail gas by using the reaction of ammonia water and sulfur dioxide or the reaction of ammonia water and ammonium sulfite in the desulfurization tower. The ammonium bisulfite generated in the above process can be further treated with ammonia water to be converted into ammonium sulfite, and the ammonium sulfite can be further oxidize...

Claims

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Application Information

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IPC IPC(8): B01D53/79B01D53/50C01C1/246
CPCB01D53/79B01D53/502B01D53/504B01D2251/206C01C1/246
Inventor 张德生于立波张玉生
Owner 北京晨晰环保工程有限公司