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Method for producing sodium sulfite by desulfurizing flue gas by double-alkali process

A technology of sodium sulfite and double alkali method, applied in the field of environmental treatment and industrial production, can solve problems such as blockage, and achieve the effect of high degree of automation, good benefits, and easy maintenance and installation.

Inactive Publication Date: 2014-09-03
尚兰华
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the above problems, the present invention provides a method for desulfurizing flue gas to produce sodium sulfite by a dual-alkali method, which not only solves the problem of blockage and corrosion of equipment and pipelines, but also improves the desulfurization efficiency

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  • Method for producing sodium sulfite by desulfurizing flue gas by double-alkali process

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Embodiment 1

[0019] Using sodium hydroxide solution as a desulfurizer to react with sulfur dioxide in flue gas to prepare sodium sulfite, the preparation process is:

[0020] (a) Add sodium hydroxide solution to increase the pH value of the desulfurization circulating fluid from 5 to 6 to 8. One can increase the desulfurization efficiency from 90% to about 97%; the other is to inhibit the formation of NaHSO 3 The direction of the side reaction is carried out so that it can generate Na as much as possible 2 SO 3 ; The third is to avoid acidic water corrosion.

[0021] (b) Draw out part of the desulfurization circulating liquid, enter the decolorization kettle to decolorize and absorb impurities, and add a strong reducing agent at the same time to make Na 2 SO 4 reduction;

[0022] Lead out 5-8% of the circulating fluid from the outlet of the circulating pump, enter the decolorization tank, control the temperature at 67°C, add 3% activated carbon for decolorization, and further absorb d...

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Abstract

The invention relates to a method for producing sodium sulfite by desulfurizing flue gas by a double-alkali process. A sodium hydroxide solution is used as a desulfurizer to react with sulfur dioxide in the flue gas to prepare the sodium sulfite. The method comprises the following steps: (a) adding the sodium hydroxide solution to enhance the pH value of the desulfurization circulating liquid to 7.5-8.5; (b) leading part of the desulfurization circulating liquid out, sending into a decolorization kettle to be subjected to decolorization and impurity adsorption, and meanwhile, adding a strong reducer to reduce the Na2SO4; (c) filtering, injecting the clear solution into an evaporation tower, and carrying out circulating concentration; (d) cooling, crystallizing, separating, drying, and packaging to obtain the finished product; and (e) returning the mother solution to the system, and continuing the step (a). The method thoroughly solves the problems of blockage and corrosion of the equipment and pipelines, so that the equipment and pipelines can operate under heavy load for a long time; the method solves the problems of difficulty in piling and secondary pollution of the sulfur gypsum and lime mud; and the method can enhance the desulfurization efficiency, and prevents the desulfurization liquid from corroding the desulfurizing tower, induced fan, flue and flue pipe.

Description

technical field [0001] The invention relates to a method for producing sodium sulfite by utilizing boiler flue gas, and belongs to the field of environmental treatment and industrial production. Background technique [0002] At present, power plants and some industrial furnaces in our country generally use the double alkali method to remove sulfur dioxide in the flue gas, which has made great progress compared with the limestone method and lime water method in the past, especially to solve the problem of desulfurization efficiency. The double-alkali flue gas desulfurization technology is: using sodium hydroxide solution as a desulfurizing agent to react with sulfur dioxide in the flue gas to generate sodium sulfite to complete the desulfurization process. The regeneration process is the replacement process, that is, the prepared calcium hydroxide solution is replaced in the regeneration tank to generate sodium hydroxide and calcium sulfite (calcium sulfate) to form a pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/14
Inventor 尚兰华
Owner 尚兰华
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