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A method for purifying boiler flue gas

A boiler flue gas and boiler flue technology, applied in chemical instruments and methods, separation methods, lighting and heating equipment, etc., can solve secondary water pollution, affect environmental quality, poor dust removal efficiency, etc., to prevent secondary Water pollution, prevention of back channeling, good flue gas purification effect

Active Publication Date: 2016-11-30
HMEI THREAD CO LTD OF YINBIN SICHUAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The boiler flue gas dedusting and desulfurization method disclosed in this patent document can only absorb large particles of dust in the flue gas through electric field electrostatic dust removal. The desulfurization waste slag liquid obtained after slag liquid treatment is likely to cause secondary water pollution and seriously affect environmental quality

Method used

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  • A method for purifying boiler flue gas
  • A method for purifying boiler flue gas
  • A method for purifying boiler flue gas

Examples

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Effect test

Embodiment 1

[0046] see figure 1 , a boiler flue gas purification method, comprising an electrostatic precipitator step and a desulfurization step, and also includes an evaporation drying step, the electrostatic precipitator step refers to introducing the flue gas in the boiler flue into an electrostatic precipitator 1, and the electrostatic precipitator 1 removes the smoke most of the dust in the gas; the desulfurization step refers to the mixing of the flue gas after the electrostatic precipitating step with the lye spray in the electric field 2 of the shaft, and the fine ash particles and sulfur dioxide in the flue gas gather under the force of the electric field and the lye spray , capture, coagulate and gather into small groups to stick on the electrode 3 of the shaft electric field 2; the evaporation and drying step means that the residual ash particles after the desulfurization step are washed into the evaporation drying box 5 by the water flow formed by the sprayer 4 , the evaporat...

Embodiment 2

[0049] see figure 1 , a boiler flue gas purification method, comprising an electrostatic precipitator step and a desulfurization step, and also includes an evaporation drying step, the electrostatic precipitator step refers to introducing the flue gas in the boiler flue into an electrostatic precipitator 1, and the electrostatic precipitator 1 removes the smoke most of the dust in the gas; the desulfurization step refers to the mixing of the flue gas after the electrostatic precipitating step with the lye spray in the electric field 2 of the shaft, and the fine ash particles and sulfur dioxide in the flue gas gather under the force of the electric field and the lye spray , capture, coagulate and gather into small groups to stick on the electrode 3 of the shaft electric field 2; the evaporation and drying step means that the residual ash particles after the desulfurization step are washed into the evaporation drying box 5 by the water flow formed by the sprayer 4 , the evaporat...

Embodiment 3

[0053] see figure 2 , a boiler flue gas purification method, comprising an electrostatic precipitator step and a desulfurization step, and also includes an evaporation drying step, the electrostatic precipitator step refers to introducing the flue gas in the boiler flue into an electrostatic precipitator 1, and the electrostatic precipitator 1 removes the smoke most of the dust in the gas; the desulfurization step refers to the mixing of the flue gas after the electrostatic precipitating step with the lye spray in the electric field 2 of the shaft, and the fine ash particles and sulfur dioxide in the flue gas gather under the force of the electric field and the lye spray , capture, coagulate and gather into small groups to stick on the electrode 3 of the shaft electric field 2; the evaporation and drying step means that the residual ash particles after the desulfurization step are washed into the evaporation drying box 5 by the water flow formed by the sprayer 4 , the evapora...

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Abstract

The present invention discloses a purification method for boiler flue gas, comprising the steps of: electrostatic precipitation, desulfurization, and evaporation and drying. In the electrostatic precipitation step, the flue gas in a boiler flue is introduced into a electrostatic precipitator so as to remove a great mass of dust in the flue gas. In the desulfurization step, the flue gas, after the electrostatic precipitation step, is mixed with an alkaline liquid spray in a vertical shaft electric field; the fine ash particles and sulfur dioxide of the flue gas, influenced by an electric field force, and grouped, captured and coagulated by the alkali liquid spray, concentrate into small clumps that adhere to electrodes of the vertical shaft electric field. In the evaporation and drying step, the residual ash particles, after the desulfurization step, are washed, by current formed by an atomizer, into an evaporating drier, ash water is evaporated to dry by using the evaporation drier and the waste heat of the flue gas so as to obtain the clean flue gas. The method of the present invention is not only capable of mixing the fine ash particles in the flue gas with atomized lye sufficiently, thereby removing sulfur dioxide in the flue gas, but also can effectively prevent the secondary water pollution caused by ash and water mixture and has a good purification effect on the flue gas.

Description

technical field [0001] The invention relates to the technical field of dust removal and purification of boiler flue gas, in particular to a method capable of thoroughly purifying boiler flue gas without generating secondary pollution. Background technique [0002] In recent years, air pollution has become more and more serious. Coal-fired boilers used in thermal power plants, industrial boilers, heating boilers, and kilns that use coal as fuel in iron and steel enterprises will emit a large amount of flue gas into the atmosphere. There is a large amount of sulfur dioxide in the flue gas , nitrogen oxides and dust, these toxic substances are also discharged into the atmosphere with the flue gas, which is the main source of air pollution. Although the efficiency of conventional electrostatic precipitators has reached 99%, its dust removal efficiency for too fine dust is still very high. Low; the bag filter has high efficiency for fine dust, but the resistance is very large, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D50/00B01D53/78B01D53/50F23J15/00F23J15/04
Inventor 冯静蒋文斌肖雪峰张西平
Owner HMEI THREAD CO LTD OF YINBIN SICHUAN
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