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Super-clean exhausting integral tower and treating technology for coal-fired boiler exhaust gas

A coal-fired boiler, ultra-clean technology, applied in the direction of electrode cleaning, external electrostatic separator, electrode structure, etc., to achieve the effects of reducing the probability of electric sparks, stable installation, and energy saving

Active Publication Date: 2015-11-25
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the demister in the absorption tower cannot effectively capture acid mist, dust, and water vapor

Method used

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  • Super-clean exhausting integral tower and treating technology for coal-fired boiler exhaust gas
  • Super-clean exhausting integral tower and treating technology for coal-fired boiler exhaust gas
  • Super-clean exhausting integral tower and treating technology for coal-fired boiler exhaust gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] The flue gas volume of a coal-fired boiler is 59723m3 / h, NOx349mg / Nm 3 , SO 2 1501mg / Nm 3 After the initial flue gas enters the ultra-clean integrated tower, the flue gas is subjected to ultra-clean treatment in the tower, and the molar ratio of ozone injected into the gas path to nitrogen oxides in the flue gas is n O3 :n NO =2.5; the molar ratio of the liquid-gas ratio of the denitrification spray gun to the injected NaOH solution and the nitrogen oxides in the flue gas is n NaOH :n NO = 1.5, the temperature of the alkaline solution is 5°C, the liquid-gas ratio of the sprayed lye flow rate and the flue gas volume is 0.05, the atomized particle size D50 is 30 μm, the discharge voltage at the wet electricity place is 72KV, the length of the anode plate is 8m, and the spacing is 280mm , the burr length is 25mm, and the burr spacing is 50mm. Tower outlet NOx9mg / Nm 3 , SO 2 4mg / Nm 3 , Dust 3mg / Nm 3 , water vapor content 2mg / Nm 3 .

Embodiment 2

[0111] The flue gas volume of a coal-fired boiler is 60023m3 / h, NOx351mg / Nm 3 , SO 2 1487mg / Nm 3 After the initial flue gas enters the ultra-clean integrated tower, the flue gas is subjected to ultra-clean treatment in the tower, and the molar ratio of ozone injected into the gas path to nitrogen oxides in the flue gas is n O3 :n NO =2.1; Denitrification spray gun liquid-gas ratio injected K 2 CO 3 The molar ratio of nitrogen oxides in the solution to the flue gas is n K2CO3 :n NO = 1.4, the temperature of the alkaline solution is 10°C, the liquid-gas ratio of the sprayed lye flow rate and the flue gas volume is 0.04, the atomized particle size D50 is 50 μm, the discharge voltage at the wet electricity place is 70KV, the length of the anode plate is 7m, and the spacing is 300mm , the burr length is 20mm, and the burr spacing is 75mm. Tower outlet NOx14mg / Nm 3 , SO 2 8mg / Nm 3 , Dust 4mg / Nm 3 , water vapor content 6mg / Nm 3 .

Embodiment 3

[0113] The flue gas volume of a coal-fired boiler is 59887m3 / h, NOx352mg / Nm 3 , SO 2 1470mg / Nm 3 After the initial flue gas enters the ultra-clean integrated tower, the flue gas is subjected to ultra-clean treatment in the tower, and the molar ratio of ozone injected into the gas path to nitrogen oxides in the flue gas is n O3 :n NO =2.0; the molar ratio of the liquid-gas ratio of the denitrification spray gun to the nitrogen oxides in the sprayed KOH solution and the flue gas is n KOH :n NO = 1.4, the temperature of the alkaline solution is 10°C, the liquid-gas ratio of the sprayed lye flow rate and the flue gas volume is 0.02, the atomized particle size D50 is 80 μm, the discharge voltage at the wet electricity place is 65KV, the length of the anode plate is 6m, and the spacing is 320mm , the burr length is 20mm, and the burr spacing is 75mm. Tower outlet NOx19mg / Nm 3, SO 2 12mg / Nm 3 , dust 4.5mg / Nm 3 , water vapor content 10mg / Nm 3 .

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Abstract

The invention discloses a super-clean exhausting integral tower and treating technology for coal-fired boiler exhaust gas. The treating technology includes the steps that the exhaust gas is fed into an absorption tower through an exhaust gas inlet of the absorption tower and upwards flows, desulfurization spraying and primary demisting are sequentially carried out, ozone oxidation, alkali liquor atomization mixing denitration and wet-type electric precipitation are carried out at the same time, secondary demisting is finally carried out, and then the exhaust gas is exhausted through an exhaust gas outlet in the top of the absorption tower; ozone and denitration absorption liquor are fed into an oxidation and denitration section through an air way and a liquor way respectively and mixed through double-fluid denitration spraying guns to be atomized and sprayed into the exhaust gas; slurry generated by desulfurization spraying falls into a slurry pond, and air is introduced into the slurry pond for oxidation; atomization alkaline liquor is captured through wet-type electric precipitation, and washing water generated in the wet-type electric precipitation process and washing water generated after wet-type electric precipitation are collected through a liquid collecting tank and temporarily stored and filtered outside the absorption tower to be reused as washing water. By means of the super-clean exhausting integral tower and treating technology, the desulfurization efficiency of the absorption tower is improved; meanwhile, denitration, dust removing and demisting can be achieved, and therefore the coal-fired exhaust gas can meet the stricter exhausting standard.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a coal-fired boiler flue gas ultra-clean exhaust integrated device, which can effectively remove SO in the flue gas 2 , NOx, dust and water vapor is a new type of device, which is suitable for the field of flue gas dust removal of power plant boilers, industrial boilers, incinerators, etc. Background technique [0002] Haze is a mixture of fog and haze. Fog is the product of condensation (or sublimation) of water vapor in the air near the surface, and is an aerosol system composed of a large number of tiny water droplets or ice crystals suspended in the air near the surface. Haze refers to the dust, sulfuric acid, nitric acid, organic hydrocarbons and other particles in the air that make the atmosphere cloudy, blur the vision and cause visibility to deteriorate. Among the basic conditions of fog and haze weather, except for fine haze particles related to human prod...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/60B01D50/00B03C3/16B03C3/41B03C3/47B03C3/78
Inventor 王岳军寿冬金莫建松吴忠标孙华梁平
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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