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Wet desulphurization method for coal-fired power plant and additive used by same

A technology of wet desulfurization and coal-fired power plants, which is applied in the field of flue gas desulfurization, which can solve the problems of easy foaming of organic matter and the inability to improve the oxidation effect of CaSO3, so as to increase the number of crystal seeds, improve the oxidation efficiency and gypsum purity, and reduce the amount of production Effect

Active Publication Date: 2011-06-22
HUADIAN ENVIRONMENTAL PROTECTION ENG & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these patented technologies are all pure organic matter, the purpose is to promote SO 2 Absorption and CaCO 3 Dissolution, and the pH of the buffered slurry, but cannot be achieved to increase the CaSO 3 The oxidation effect and the purpose of simultaneous denitrification and mercury removal, and organic matter is easy to foam

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: the preparation of additive: get the raw material of following weight ratio: sodium adipate 77%, sodium dodecylbenzene sulfonate 10.8%, Na 2 CO 3 10%, cobalt oxide 0.2%, magnesium oxide 2%, mix them and stir evenly.

[0026] Desulfurization without additives:

[0027] Desulfurization method: put limestone slurry with a solid content of 30% into the absorption tower, the slurry sprays and washes the countercurrent flue gas, and then is oxidized to CaSO by air in the slurry tank 4 , and finally sent to the gypsum dehydration system, separated into gypsum and water. Desulfurization effect: the load in the desulfurization system is 23MW, SO 2 The inlet concentration is 5000ppm, four slurry circulating pumps are running simultaneously, the desulfurization efficiency is 92%, the denitrification rate is 30%, and the mercury removal rate is 10%. When the pH value in the absorption tower is 5.8, CaCO 3 Content is 3.40%, CaSO 3 Content is 1.85%, CaSO 4 The co...

Embodiment 2

[0030] Embodiment 2: the preparation of additive: get the raw material of following weight ratio: sodium adipate 77%, sodium dodecylbenzene sulfonate 10.8%, Na 2 SO 4 6%, Na 2 CO 3 4%, 0.2% cobalt oxide, 2% magnesium oxide, mix them and stir evenly.

[0031] Desulfurization without additives:

[0032] Desulfurization method: put limestone slurry with a solid content of 30% into the absorption tower, the slurry sprays and washes the countercurrent flue gas, and then is oxidized to CaSO by air in the slurry tank 4 , and finally sent to the gypsum dehydration system, separated into gypsum and water. Desulfurization effect: the load in the desulfurization system is 23MW, SO 2 The inlet concentration is 5000ppm, four slurry circulating pumps are running simultaneously, the desulfurization efficiency is 92%, the denitrification rate is 30%, and the mercury removal rate is 10%. When the pH value in the absorption tower is 5.8, CaCO3 Content is 3.40%, CaSO 3 Content is 1.85%, C...

Embodiment 3

[0035] Embodiment 3: the preparation of additive: get the raw material of following weight ratio: sodium succinate 78%, sodium dodecylbenzenesulfonate 9%, Na 2 CO 3 7.5%, 0.5% cobalt oxide, 5% magnesium oxide, mix them and stir evenly.

[0036] Desulfurization without additives:

[0037] Desulfurization method: put limestone slurry with a solid content of 30% into the absorption tower, the slurry sprays and washes the countercurrent flue gas, and then is oxidized to CaSO by air in the slurry tank 4 , and finally sent to the gypsum dehydration system, separated into gypsum and water. Desulfurization effect: the load in the desulfurization system is 25MW, SO 2 The inlet concentration is 6000ppm, four slurry circulating pumps are running at the same time, the desulfurization efficiency is 90%, the denitrification rate is 30%, and the mercury removal rate is 10%. When the pH value in the absorption tower is 6.0, CaCO 3 Content is 3.64%, CaSO 3 Content is 2.05%, CaSO 4 The c...

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Abstract

The invention discloses a wet desulphurization method for a coal-fired power plant and an additive used by the same. The additive comprises the following components in percentage by weight: 70 to 80 percent of alkyl carboxylates, 5 to 10 percent of limestone active agent, 2 to 10 percent of metallic oxide and 5 to 15 percent of surfactant. The additive of the invention can improve the desulfurization effect of an absorption tower and adapt to high-sulfur coal, so that the outlet concentration of SO2 reaches the standard, and a slurry circulating pump also can be stopped in varying degrees to fulfill the aim of energy conservation; and the additive is dissolved in water easily, and the pH value is neutral, so the additive has the characteristic that the additive is easy and convenient to use, does not have air bubbles in the using process and corrode equipment. By the desulphurization method using the additive, the use amount of limestone can be reduced, the oxidization efficiency and gypsum purity of CaSO3 can be improved, the dehydration efficiency of gypsum can be improved, and NO content and Hg content in smoke also can be reduced to achieve the effects of desulfuration, denitration, demercuration and smoke purifying.

Description

technical field [0001] The invention relates to a wet desulfurization method of a coal-fired power plant and an additive used therefor, belonging to the technical field of flue gas desulfurization. Background technique [0002] Coal has always played a dominant role in my country's energy production and consumption structure, and its output accounts for about 70% of the country's primary energy output. In the foreseeable next few decades, my country's coal-based energy structure will not change, and it will still be An important part of China's energy. The composition of China's primary energy determines that coal is the main energy source for power generation. Coal-fired thermal power generating units occupy a dominant position in my country's power industry. Most of my country's large-scale power stations are conventional coal-fired power stations. Therefore, the combustion of coal is the biggest source of pollution that causes damage to the ecological environment in our c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/50
Inventor 李建浏陶爱平苏军划金颖姗沈煜晖
Owner HUADIAN ENVIRONMENTAL PROTECTION ENG & TECH
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