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A device and method for removing sulfur dioxide in flue gas by using calcium carbide slag

A technology of sulfur dioxide and carbide slag, applied in chemical instruments and methods, separation methods, gas treatment and other directions, can solve the problem that gypsum slurry cannot meet the needs of oxidative crystallization, and achieve the effect of ensuring sustainable development, saving costs, and reducing operating costs.

Active Publication Date: 2018-09-14
湖南湘牛环保实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, those skilled in the art urgently need to improve the gypsum wet desulfurization process to solve the defect that the gypsum slurry generated after calcium carbide slag-gypsum desulfurization cannot meet the requirements of oxidation crystallization due to the high pH value

Method used

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  • A device and method for removing sulfur dioxide in flue gas by using calcium carbide slag
  • A device and method for removing sulfur dioxide in flue gas by using calcium carbide slag

Examples

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Embodiment 1

[0026] Transport the causticized carbide slag produced by the paper mill to the calcium carbide slag mixing bin, and use a mixer to stir the causticized carbide slag. During the stirring process, process industrial water to form calcium carbide slag slurry. During the stirring process, monitor the water content of the calcium carbide slag slurry. Control the concentration of water in the carbide slag slurry to 29%; pump the carbide slag slurry into the calcium carbide slag slurry configuration box for storage, and send the limestone powder in the lime powder bin into the limestone slurry through the weighing feed valve Limestone slurry is configured in the configuration box for standby, and a desulfurization liquid system is configured at the same time; the calcium carbide slag slurry is piped from the calcium carbide slag slurry configuration box to the nozzle of the absorption tower spray layer through the slurry pump, and sprayed out by the nozzle, the number of nozzles Ther...

Embodiment 2

[0028] Transport the produced causticized carbide slag to the calcium carbide slag mixing chamber, use a mixer to stir the causticized carbide slag, process industrial water during the stirring process, and form calcium carbide slag slurry, monitor the water content of the calcium carbide slag slurry during the stirring process, and control the calcium carbide slag The concentration of water in the slurry is 21%; the calcium carbide slurry is pumped into the calcium carbide slurry configuration box for storage through the carbide slurry pump, and the limestone powder in the lime powder bin is sent into the limestone slurry configuration box by the weighing feed valve The interior is configured as limestone slurry for standby, and a desulfurization liquid system is configured at the same time; the calcium carbide slag slurry is piped from the calcium carbide slag slurry configuration box through the slurry pump to the nozzle of the spray layer of the absorption tower, and is spra...

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Abstract

The invention discloses a device and a method for removing sulfur dioxide in fume by using carbide slag. The method for removing sulfur dioxide in boiler fume by using waste carbide slag generated in a paper-making alkali recovery process as a doctor solution comprises the following steps: firstly, detecting the content of calcium carbonate in causticized carbide slag, and adding water to stir the causticized carbide slag so as to obtain 20% carbide slag slurry; conveying the prepared carbide slag to a slurry preparation tank for storage through a pipeline by using a high-lift carbide slag pump, conveying the slurry to a nozzle of a desulfurizer spraying layer by using a lime slurry pump, enabling the nozzle to eject out the slurry to sufficiently contact fume which is discharged upwards, thereby removing the sulfur dioxide in the fume through a chemical absorption reaction. The device and the method are applicable to the situation that a great deal of waste carbide slag is generated in a paper-making plant and a wet desulphurization device is needed, and is low in operation cost, stable and reliable and remarkable in desulfurization effect.

Description

technical field [0001] The invention belongs to a desulfurization device and a process, in particular to a device and a method for removing sulfur dioxide in flue gas by utilizing calcium carbide slag. Background technique [0002] my country's energy composition is dominated by coal, and its consumption accounts for about 70% of the total primary energy consumption. This situation will not change for a long time in the future. The sulfur dioxide emitted by my country's coal-fired power plants accounts for about 50% of the country's total sulfur dioxide emissions. Thermal power plants use coal as the main fuel to generate electricity. The direct combustion of coal releases a large amount of sulfur dioxide, which causes air pollution and must be desulfurized. [0003] At present, there are nearly 200 desulfurization methods for domestic and foreign power plants, which are mainly divided into three categories: dry desulfurization, wet desulfurization and semi-dry desulfurizat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/50B01D53/73B01D53/80B01D53/96
CPCB01D53/502B01D53/73B01D53/80B01D53/96B01D2258/0283
Inventor 刘卫国金伟连禹红
Owner 湖南湘牛环保实业有限公司
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