Flue gas desulfurization process and device adopting acetylene sludge-gypsum method

A calcium carbide slag and gypsum process technology, applied in the field of flue gas desulfurization, can solve the problems of the desulfurization device being unable to operate normally, hindering the oxidation of calcium sulfite, and difficulty in the dehydration process of gypsum, so as to prolong the service life, reduce the operation cost and improve the safety. Effect

Active Publication Date: 2012-10-31
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] If calcium carbide slag is directly used as a desulfurizer in the traditional limestone-gypsum flue gas desulfurization device for desulfurization, many fatal problems will occur, resulting in the failure of the entire desulfurization device to operate normally.
The sulfide in calcium carbide slag has strong reducibility, and it will perform redox reaction with oxygen in the air prior to calcium sulfite, hindering the oxidation of calcium sulfite, making the whole system unable to produce gypsum; trace silicon oxide And aluminum oxide will form a colloidal substance in the desulfurization system to fill the entire s

Method used

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  • Flue gas desulfurization process and device adopting acetylene sludge-gypsum method

Examples

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Effect test

Embodiment 1

[0040] In a thermal power plant, four 130t / h boilers adopt this desulfurization process. The pH value of the slurry pretreatment tank is controlled at 8.0-9.0. The net flue gas entering the slurry pretreatment tank accounts for 4.3% of the total flue gas volume. The bubbling layer is designed as 0.5 meters, the liquid-gas ratio is 8L / m 3 , The pH value of the absorption tower is controlled between 5.0-5.4. Imported sulfur dioxide concentration is 4800mg / m 3 , the outlet sulfur dioxide concentration is 51mg / m 3 , the purity of gypsum is 98.4%, the moisture content of gypsum is 7.9%, and the content of heavy metal ions in gypsum is 0.01%.

Embodiment 2

[0042] In a thermal power plant, two 220t / h boilers adopt this desulfurization process. The pH value of the slurry pretreatment tank is controlled at 8.2-8.8. The net flue gas entering the slurry pretreatment tank accounts for 3.7% of the total flue gas volume. The bubbling layer is designed as 0.5 meters, the liquid-gas ratio is 9L / m 3 , The pH value of the absorption tower is controlled between 5.2-5.5. Imported sulfur dioxide concentration is 5460mg / m 3 , the outlet sulfur dioxide concentration is 62mg / m 3 , the purity of gypsum is 99.1%, the moisture content of gypsum is 8.3%, and the content of heavy metal ions in gypsum is 0.01%.

Embodiment 3

[0044] A self-owned power plant of an enterprise, 4 sets of 135MW units adopt this desulfurization process, the pH value of the slurry pretreatment tank is controlled at 8.0-8.5, the net flue gas entering the slurry pretreatment tank accounts for 4.6% of the total flue gas volume, the bubble layer design 0.5 meters, the liquid-gas ratio is 9L / m 3 , The pH value of the absorption tower is controlled between 5.1-5.6. Imported sulfur dioxide concentration is 4880mg / m 3 , the outlet sulfur dioxide concentration is 46mg / m 3 , the purity of gypsum is 98.4%, the moisture content of gypsum is 9.2%, and the content of heavy metal ions in gypsum is 0.01%.

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Abstract

The invention discloses a flue gas desulfurization process and a device adopting acetylene sludge-gypsum method. The process comprises the following steps that acetylene sludge is utilized as a desulfurizing agent to carry out wet desulphurization to fuel gas to obtain pure smoke; the process in characterized in that the acetylene sludge is subjected to pulping so as to obtain an acetylene sludge solution, part of clean smoke is agitated into the acetylene sludge solution to carry out bubbling reaction, the acetylene sludge is preprocessed, and the acetylene sludge solution after preprocessing is utilized as the desulfurizing agent to carry out spraying desulfuration through rotational flow separation edulcoration. The device comprises an absorption tower, a circulating pump, a chimney and an outlet smoke channel arranged between the absorption tower and the chimney, as well as a serous fluid preprocessing tank which is internally provided with a bubbling layer and a rotational flow separating device which is connected with the serous fluid preprocessing tank and the inlet of the circulating pump, wherein the bubbling layer is communicated with the outlet smoke channel. According to the invention, the smoke after purification is preprocessed through the acetylene sludge, the quality of the desulfurization gypsum is improved, and the industrial cost is low.

Description

technical field [0001] The invention relates to the technical field of flue gas desulfurization, in particular to a calcium carbide slag-gypsum method flue gas desulfurization process and device. Background technique [0002] Controlling coal-fired boiler flue gas SO 2 In addition to measures such as coal washing, clean coal combustion technology, burning low-sulfur coal and flue gas desulfurization, flue gas desulfurization technology is the most widely used technology. There are hundreds of flue gas desulfurization technologies, and the implementation of desulfurization and dust removal technology is one of them. It is a practical technology developed on the basis of traditional wet dust removal technology in line with China's national conditions. It is especially suitable for large and medium-sized Dust removal and desulfurization of industrial boiler flue gas. [0003] Wet flue gas desulfurization technology is to use liquid absorbent to wash flue gas to absorb SO in e...

Claims

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Application Information

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IPC IPC(8): B01D53/80B01D53/56C04B11/02
Inventor 李泽清莫建松吴忠标
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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