A method for producing sodium sulfite by desulfurizing flue gas by double alkali method

A technology of sodium sulfite and double alkali method, which is applied in the field of environmental management and industrial production, can solve problems such as blockage, and achieve the effects of good economic benefits, easy large-scale, and good social benefits

Inactive Publication Date: 2016-07-06
尚兰华
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  • 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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  • A method for producing sodium sulfite by desulfurizing flue gas by double alkali method

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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 method. Sodium hydroxide solution is used as a desulfurizing agent to react with sulfur dioxide in flue gas to prepare sodium sulfite. The preparation process is as follows: (a) adding sodium hydroxide solution to make The pH value of the desulfurization circulating liquid is increased to between 7.5 and 8.5; (b) part of the desulfurization circulating liquid is drawn out and enters the decolorization kettle for decolorization and adsorption of impurities, and at the same time, a strong reducing agent is added to make the Na 2 SO 4 Reduction; (c) After filtration, put the clear liquid into the evaporation tower, and circulate and concentrate; (d) Then cool down, crystallize, separate, dry, and pack to become the finished product; (e) Return the mother liquor to the system and continue ( a) Steps. It completely solves the problem of blockage and corrosion of equipment and pipelines, so that it can run for a long period of time with a large load; it solves the problem of difficult stacking of sulfur gypsum and lime residue and secondary pollution; it can improve desulfurization efficiency and avoid desulfurization liquid on the desulfurization tower. , Corrosion of induced draft fan, flue, chimney.

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 precipi...

Claims

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Application Information

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