Smoke desulfurization method for coal-fired boiler

A coal-fired boiler and flue gas technology, applied in the field of desulfurization, can solve the problems of secondary pollution, loss and waste, large investment, etc., and achieve the effect of increasing reaction opportunities, improving desulfurization efficiency, and small investment

Inactive Publication Date: 2012-08-22
镇赉新盛纸业有限公司
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  • Abstract
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Problems solved by technology

[0005] The main purpose of the present invention is to solve the problems of large investment, high cost and easy occurrence of secondary pollution in the existing coal-fired desulfurization method;
[0006] Another object of the ...

Method used

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Examples

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specific example

[0045] Specific examples are as follows:

[0046] For an enterprise with an annual production of 26,969.4 tons of bleached reed pulp, the minimum cooking alkali consumption per ton of bleached reed pulp is 385kg / T, and the annual cooking alkali consumption is 10,383 tons; the annual recovery of caustic soda is 7,798.13 tons, according to the material balance calculation of the alkali recovery and combustion section and the actual production , in the case of high-temperature atomization combustion, the amount of alkali loss is 3% of the amount of alkali used for cooking; so 311.5 tons of NaOH are lost with the soda furnace smoke every year, and NaOH is converted into Na 2 CO 3 It is 412.7 tons, forming alkali vapor and entering the flue.

[0047] Based on: 2Na 2 CO 3 +SO 2 +H 2 O=2NaHCO 3 +Na 2 SO 3 chemical reaction formula;

[0048] 412.7 tons of Na per year 2 CO 3 Alkali vapor can absorb SO 2 124.7 tons / year, at the same time can generate NaHCO 3 : 327.1 ton...

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PUM

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Abstract

The invention discloses a smoke desulfurization method for a coal-fired boiler. The smoke desulfurization method comprises the following steps that: firstly, non-desulfurized smoke generated in the coal-fired boiler is introduced into a flue by a high-voltage electrostatic precipitator; secondly, smoke generated in a soda recovery furnace is introduced into the flue in the first step by virtue of another high-voltage electrostatic precipitator; and thirdly, after the smoke generated in the coal-fired boiler and the soda recovery furnace in the first and second steps simultaneously enter the common flue and then are fully mixed and reacted, the reacted smoke is discharged from the flue by a draught fan. The smoke desulfurization method has the beneficial effects that the input is small, the desulfurization cost is low, secondary pollution is avoided, the aim of treating wastes with wastes is achieved by utilizing waste gas discharged from the soda recovery furnace to perform the desulfurization, the effect is optimal, the economic benefits are remarkable, and thus the method is the optimal method which can not be replaced by other desulfurization methods.

Description

technical field [0001] The invention relates to a desulfurization method, in particular to a desulfurization method for flue gas of a coal-fired boiler. Background technique [0002] At present, the mature coal-fired desulfurization methods can be divided into four categories: desulfurization before coal combustion, desulfurization during combustion, desulfurization after combustion and desulfurization of coal conversion forms. Desulfurization after combustion is common, and desulfurization after combustion is specifically divided into: lime / limestone method, sodium-alkali method, double-alkali method, magnesium oxide method, ammonia absorption method, etc. Among them, the most reliable and mature desulfurization technology is lime / lime method and sodium-alkali method. Common desulfurizers are: limestone, lime, slaked lime, soda ash (Na 2 CO 3 ), magnesium, liquid ammonia and alkaline compounds, etc. [0003] However, using the above-mentioned methods for coal-fired desu...

Claims

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Application Information

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IPC IPC(8): B01D53/76B01D53/78B01D53/50
Inventor 李仲持
Owner 镇赉新盛纸业有限公司
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