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Desulfurization slurry stabilizing agent for wet limestone flue gas desulfurization, and using method of desulfurization slurry stabilizing agent

A desulfurization slurry and stabilizer technology, applied in separation methods, chemical instruments and methods, and dispersed particle separation, can solve problems such as downstream equipment corrosion and acid mist discharge, and achieve reduced dosage, rapid foam breaking, and strong hydrophilicity Effect

Inactive Publication Date: 2012-06-13
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A large amount of metal oxide catalysts are required in this process, and the catalysts can convert SO in the flue gas 2 Oxidation to SO 3 , SO 3 A very fine sulfuric acid mist will be formed at the tail of the flue, and the wet limestone-gypsum desulfurization process has little ability to remove this sulfuric acid mist, which will cause corrosion of downstream equipment and discharge of acid mist

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The desulfurization slurry stabilizer in this embodiment is composed of slaked lime, sodium formate, and defoamer, and the components and their mass percentages are: slaked lime 55%, sodium formate 23%, and defoamer 22%.

[0017] A 660MW wet-process limestone desulfurization unit equipped with SCR in a coal-fired power plant added the desulfurization slurry stabilizer with the above composition ratio. The amount of stabilizer added was 700 mg / L. Medium SO 3 Content 49.4mg / m 3 , under the same operating conditions, after adding the slurry stabilizer, the desulfurization efficiency is 94.2-95.7%, and the SO in the exhausted flue gas 3 Content 11.2 mg / m 3 , The slurry has no foaming phenomenon.

Embodiment 2

[0019] The desulfurization slurry stabilizer in this embodiment is composed of slaked lime, sodium formate, and defoamer. The components and their mass percentages are: slaked lime 52%, sodium formate 30%, and defoamer 17%.

[0020] The wet limestone desulfurization unit of a coal-fired power plant has a high sulfur content in the coal and the limited design of the desulfurization absorption tower. Dibasic carboxylic acid desulfurization synergists with adipic acid as the main component are often used to improve desulfurization efficiency. The acid-based desulfurization synergist will reduce the pH value of the desulfurization slurry from 5.4 to about 5.1. When the SO in the flue gas 2 When the content fluctuates, the pH value is often difficult to stabilize, and the desulfurization system cannot operate normally. Add the desulfurization slurry stabilizer with the above composition ratio, the amount of the stabilizer is 900 mg / L, the desulfurization efficiency before adding th...

Embodiment 3

[0022] The desulfurization slurry stabilizer in this embodiment is composed of slaked lime, sodium formate, and defoamer. The components and their mass percentages are: slaked lime 50%, sodium formate 30%, and defoamer 20%.

[0023] A 350MW wet-process limestone desulfurization unit in a coal-fired power plant without a denitrification system was added with a desulfurization slurry stabilizer with the above composition ratio. The amount of the stabilizer added was 700 mg / L. SO in flue gas 3 Content 36.8 mg / m 3 , under the same operating conditions, after adding the slurry stabilizer, the desulfurization efficiency is 93.9-95.1%, and the SO in the exhausted flue gas 3 Content 9.9 mg / m 3 .

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Abstract

The invention discloses a desulfurization slurry stabilizing agent for wet limestone flue gas desulfurization, and a using method of the desulfurization slurry stabilizing agent. The desulfurization slurry stabilizing agent comprises 30 to 70 mass percent of lime, 15 to 40 mass percent of sodium formate, and 15 to 40 mass percent of antifoaming agent. The using method of the desulfurization slurry stabilizing agent comprises the following steps of: adding water or desulfurization slurry into a slurry stabilizing agent to prepare uniform liquid at mass concentration of 10 to 30 percent outside a desulfurizing tower, pumping into an inlet of a slurry circulating pump by using a pump, sequentially feeding into an absorption area and a reaction area by using the slurry circulating pump and a slurry atomization spray device, and performing physicochemical interaction on the uniform liquid, flue gas and desulfurization slurry, wherein the concentration range of effective action of the desulfurization slurry stabilizing agent is 200 to 1,000mg / L. By using the desulfurization slurry stabilizing agent, the pH value of the slurry in a desulfurization process can be effectively stabilized, the foam of the desulfurization slurry can be inhibited, desulfurization efficiency can be improved, and discharge of sulfuric acid mist in the flue gas can be reduced.

Description

technical field [0001] The invention relates to wet limestone flue gas desulfurization, in particular to a limestone wet flue gas desulfurization slurry stabilizer and a use method thereof. Background technique [0002] SO emissions from coal-fired power plants 2 It is the main source of air pollutants and the main factor leading to acid rain. Wet limestone-gypsum flue gas desulfurization technology has the advantages of mature technology, high desulfurization efficiency, reliable operation, and comprehensive utilization of by-products. It is currently the most widely used flue gas desulfurization process in the world. [0003] Due to changes in the coal market, thermal power plants actually burn coals from a wide range of sources, with many changes, and many impurities. 2 Large fluctuations in content will lead to problems such as overloading of the desulfurization system, easy foaming of the slurry, decrease in pH value of the slurry, and decrease in desulfurization effi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/50
CPCB01D53/502B01D2251/404B01D53/78B01D53/50B01D2251/606
Inventor 徐锐梅重民邓永强伍发元毛荣军田旭
Owner STATE GRID CORP OF CHINA