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Method for reducing nitrogen oxides in flue gas of medium and small sized industrial coal burning boiler through combination with wet-method sulfur removing technology

A technology for coal-fired boilers and flue gas, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of low solubility and difficult removal of nitrogen oxides, and achieve high removal efficiency and equipment renovation investment. Small, low operating costs

Inactive Publication Date: 2015-07-29
BEIJING YANJING BREWERY
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Problems solved by technology

[0005] 90-95% of NO in the flue gas of coal-fired boilers x It is NO, and the solubility of NO in water is very low, which makes it difficult to complete the removal of nitrogen oxides under the existing wet desulfurization conditions

Method used

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  • Method for reducing nitrogen oxides in flue gas of medium and small sized industrial coal burning boiler through combination with wet-method sulfur removing technology

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Embodiment Construction

[0061] The present invention will be described below through specific examples, but the present invention is not limited thereto.

[0062] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

[0063] The technical solution of the present invention is to provide a method for removing nitrogen oxides from flue gas of a coal-fired boiler by using an oxidation method combined with a double-alkali desulfurization technology.

[0064] First, low nitrogen oxides (NOx) were achieved by controlling the oxygen content in the coal-fired boiler furnace. X ) combustion to reduce NO X The total amount is generated, and then the generated flue gas is introduced into the series tower purification system, and after dust removal and primary desulfurization pretreatment, the NO in the flue gas is oxidized to NO und...

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Abstract

The invention provides a method for reducing nitrogen oxides in flue gas of a medium and small sized industrial coal burning boiler through a wet-method sulfur removing technology. The method comprises the following steps: conducting dust removing and primary sulfur removing on flue gas generated by the coal burning boiler; collecting alkali liquor comprising sulfur removing product sodium sulfite of primary desulfuration according to a dual-alkali method; conducting oxidation treatment on the pretreated flue gas to integrally oxidize NO and residuary sulfur dioxide in the pretreated flue gas; utilizing the oxidized flue gas to get in contact with an alkali liquor, thereby removing nitrogen dioxide and sulfur oxide generated after oxidation in the oxidized flue gas to obtain purified flue gas; conducting gas-water separation to discharge flue gas which meets the environmental standard. Compared with the conventional dry-process flue gas denitration technology, the method provided by the invention has the advantages that desulfurization and denitrification can be simultaneously realized only by additionally arranging an oxidation reactor section in a conventional dual-alkali method absorbing system, so that the economic performance is very high.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a method for reducing nitrogen oxides in flue gas of small and medium-sized industrial coal-fired boilers combined with wet desulfurization technology. Background technique [0002] Atmospheric nitrogen oxide pollution is becoming more and more serious. It is estimated that about 70% of nitrogen oxides polluting the atmosphere are emitted by fuel combustion. Flue gas emissions from industrial coal-fired boilers are one of the main sources of air pollution in China. The nitrogen oxides emitted by them can lead to a large increase in PM2.5, forming serious hazards such as acid rain and photochemical smog. [0003] The treatment of sulfur dioxide in the flue gas of coal-fired boilers is relatively mature and reliable at present, and the double-alkali flue gas desulfurization technology is one of the flue gas desulfurization technologies with the highest market share. ...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/50B01D53/56
Inventor 李光俊赵伟闫满利李岩姜波
Owner BEIJING YANJING BREWERY
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