White mud/ carbide slag-gypsum wet flue gas desulfurization device and method

A technology of wet flue gas desulfurization and calcium carbide slag, which is applied in chemical instruments and methods, separation methods, calcium/strontium/barium sulfate, etc., which can solve the problems of high equipment cost, large floor space, unfavorable control of enterprise costs, etc. problems, to achieve the effect of improving the utilization rate and improving the quality of gypsum

Active Publication Date: 2012-11-07
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Although the above two methods are desulfurization devices designed for the characteristics of lime mud/calcium carbide slag, and effectively improve the quality of desulfurization gypsum under t

Method used

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  • White mud/ carbide slag-gypsum wet flue gas desulfurization device and method
  • White mud/ carbide slag-gypsum wet flue gas desulfurization device and method
  • White mud/ carbide slag-gypsum wet flue gas desulfurization device and method

Examples

Experimental program
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Effect test

Embodiment 1

[0070] In a paper mill, two 75t / h coal-fired boilers use this device and process for desulfurization, using white mud as desulfurization agent, the pH value of the slurry in the bubbling chamber is controlled at 4.5, the pH value of the slurry in the slurry chamber is controlled at 6.8, and the liquid-gas ratio is 6L. / m 3 , the concentration of imported sulfur dioxide is 4600mg / m 3 , the outlet sulfur dioxide concentration is 200mg / m 3 , the desulfurization efficiency reaches 95.6%, the gypsum purity reaches 93%, and the calcium sulfite oxidation rate reaches 96%.

Embodiment 2

[0072] In a PVC production enterprise by calcium carbide method, three 130t / h coal-fired boilers use this device and process for desulfurization, using carbide slag as desulfurization agent, the pH value of the slurry in the bubbling chamber is controlled at 4.8, the pH value of the slurry in the slurry chamber is controlled at 6.5, and the liquid gas is controlled at 6.5. than 9L / m 3 , the concentration of imported sulfur dioxide is 3600mg / m 3 , the outlet sulfur dioxide concentration is 184mg / m 3 , the desulfurization efficiency reaches 94.9%, the gypsum purity reaches 91%, and the calcium sulfite oxidation rate reaches 95%.

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Abstract

The invention discloses a white mud/carbide slag-gypsum wet flue gas desulfurization device and a white mud/ carbide slag-gypsum wet flue gas desulfurization method. The device comprises an absorption tower; the top and the middle part of the absorption tower are respectively provided with a flue gas outlet and a first flue gas inlet; a demister, a spraying device, a spraying chamber and a tower kettle are sequentially arranged in the absorption tower from top to bottom; the tower kettle is divided into a slurry chamber and a bubbling chamber by a side wall which is arranged in the tower kettle and is perpendicular to the tower bottom; the bubbling chamber is externally connected with a gypsum pump; a stirrer, an oxidation air pipe and a plurality of bubbling pipes are arranged in the bubbling chamber; the wall of the absorption tower is provided with a second flue gas inlet communicated with the bubbling pipes; and the side wall is provided with an overflow port communicated with the slurry chamber. According to the device and the method, the absorption tower is designed according to the property of white mud/carbide slag, spraying desulfurization is implemented in the spraying chamber, and bubbling oxidation of desulfurized slurry is implemented in the bubbling chamber, so that the spraying desulfurization and the bubbling oxidation are implemented separately in the absorption tower, the desulfurization efficiency and the quality of gypsum are ensured, equipment is simplified, and the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of flue gas desulfurization, in particular to a device and method for wet flue gas desulfurization of white mud / carbide slag-gypsum. Background technique [0002] At present, the main forms of equipment for removing sulfur dioxide from flue gas by wet method are: empty tower spray, tray, packed tower, bubbling tower, etc. The empty tower spray tower has a simple structure and is not easy to produce fouling, but the desulfurization efficiency of the device is high. Lower; the desulfurization efficiency of the bubbling tower is higher, but if water spray is used to cool the flue gas, it will cause the water balance of the system to be unbalanced, and if the slurry spray is used to cool the flue gas, it will lead to more serious scaling and blockage. At present, there have been a lot of reports on the devices and processes using various forms of combined desulfurization. [0003] The Chinese invention patent a...

Claims

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Application Information

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IPC IPC(8): B01D53/80B01D53/50B01D53/73C04B11/00C01F11/46
Inventor 程常杰刘兴利莫建松盛海强
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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