Desulfurizer prepared by causticized white mud and method thereof for flue gas desulphurization

A technology of causticizing white mud and desulfurization agent, which is applied in the direction of chemical instruments and methods, separation methods, and dispersed particle separation, etc., can solve the problems of desulfurization agent such as easy scaling, low use cost, and blockage, so as to improve the desulfurization effect, Anti-corrosion and easy-to-use effects

Inactive Publication Date: 2012-04-25
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The desulfurizer has high purity, good desulfurization effect, and low cost of use; it can also solve operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027]When the alkali furnace melt is dissolved into green liquor in the melting tank, 2% of the molten lime and 0.5% of the molten calcium polyacrylate flocculant are added to the solution, and the green liquor is transported to the green liquor clarification tank for clarification, and the upper clarification is obtained. Green liquor, after the green mud of the lower sedimentation is filtered, the filter residue green mud is treated separately, and the filtrate is returned to the green liquor clarification tank for clarification; lime and clarified green liquor are based on the theoretical amount of the complete reaction of calcium oxide in lime and sodium carbonate in green liquor The ratio is 1.05. After mixing, causticizing reaction is carried out at 102°C to obtain causticizing emulsion. The causticizing emulsion is sent to the white liquor clarification tank for clarification, and the upper layer of clarified white liquor and the lower layer of white mud sediment are obt...

Embodiment 2

[0030] When the alkali furnace melt is dissolved into green liquor in the melting tank, 3% of the melted lime and 1% of the melted calcium polyacrylate flocculant are added to the solution, and the green liquor is transported to the green liquor clarification tank for clarification, and the upper layer clarification is obtained. Green liquor, after the green mud of the lower sedimentation is filtered, the filter residue green mud is treated separately, and the filtrate is returned to the green liquor clarification tank for clarification; lime and clarified green liquor are based on the theoretical amount of the complete reaction of calcium oxide in lime and sodium carbonate in green liquor After the mixing ratio is 1.1, causticizing reaction is carried out at 90°C to obtain causticizing emulsion, which is sent to the white liquor clarification tank for clarification, and the upper layer of clarified white liquor and the lower layer of white mud sediment are obtained, and the whi...

Embodiment 3

[0033] In the soda recovery process of bamboo kraft pulping, when the soda furnace melt is dissolved into green liquor in the melting tank, lime with a melt volume of 2.5% and calcium polyacrylate flocculant with a melt volume of 0.8% are added to the solution to form a green liquor. Transport to the green liquor clarification tank for clarification, in which CO 2 Gas, adjust the pH of the green liquid to 9.5-10, so that part of the silicon element in the green liquid forms silicide precipitates and is filtered out to obtain the upper layer of clarified green liquid, and the lower layer of sediment green mud is filtered, and the filter residue green mud is treated separately, and the filtrate is returned to green clarification in the liquid clarification tank; after lime and clarified green liquor are mixed according to the theoretical amount ratio of 1.08 for the complete reaction of calcium oxide in lime and sodium carbonate in green liquor, causticizing reaction is carried o...

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PUM

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Abstract

The invention discloses a desulfurizer prepared by causticized white mud and a method of the desulfurizer for flue gas desulphurization. The desulfurizer is prepared by the following steps: when alkali furnace smelt is dissolved into a green liquid, adding 2-3 % of the smelt amount of lime and 0.5-1 % of the smelt amount of flocculating agent in the green liquid, mixing lime with the green liquid after clarification according to theoretical amount ratio of calcium hydrate in the lime to sodium carbonate in the green liquid being 1.05-1.1, then carrying out causticization at a temperature of 90-102 DEG C to obtain a causticized solution, clarifying the causticized solution to obtain a white liquid and white mud, washing the white mud with 50-70 DEG C water, and then filtering and dehydrating the white mud to let the dryness of the white mud be more than 60 %. A saturated or oversaturated absorption liquid comprsing the desulfurizer and water is used for flue gas desulphurization, and a scale and corrosion inhibitor having a concentration of 5-30 mg/L is added in the saturated or oversaturated absorption liquid. According to the invention, the purity of the desulfurizer prepared by causticized white mud is raised, the problems of easy scale formation, blocking, corrosion and the like in the process of desulphurization are solved, and the desulfurizer can be applied for desulphurization inside the furnace.

Description

technical field [0001] The invention relates to a desulfurizing agent, in particular to a desulfurizing agent made of causticizing lime mud; the invention also relates to a method for using the desulfurizing agent made of causticizing lime mud for flue gas desulfurization. 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. Sulfur dioxide emitted during coal combustion is an important factor of air pollution. At present, desulfurization of coal combustion can be divided into three categories: desulfurization before combustion, desulfurization during combustion and flue gas desulfurization. Desulfurization of coal-fired boilers is a mandatory air pollution control measure in my country. , Coal-fired boiler flue gas desulfurization methods can be divided into three categories: dry method, wet method and...

Claims

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Application Information

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IPC IPC(8): B01D53/50B01D53/78
Inventor 马乐凡林本平屈琴琴谭丽红
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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