Coal-fired flue gas PM2.5/SO3/Hg combined removing method based on desulfurization wastewater evaporation treatment

A technology for desulfurization wastewater and coal-fired flue gas, which is applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. Effect

Active Publication Date: 2015-12-09
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Purpose of the invention: The purpose of the present invention is to overcome the deficiencies of the existing coal-fired flue gas pollutant control technology, and to provide a coal-fired flue gas PM based on the evaporation treatment of desulfurization w

Method used

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  • Coal-fired flue gas PM2.5/SO3/Hg combined removing method based on desulfurization wastewater evaporation treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The flue gas is produced by a fully automatic coal-fired boiler with a flue gas volume of 300Nm 3 / h, the wet flue gas desulfurization method uses the limestone-gypsum method. The dust-containing flue gas produced by the fully automatic coal-fired boiler 1 is mixed with the chemical agglomerating agent droplets sprayed through the double-fluid atomizing nozzle 4 through the SCR denitrification device 2 and the air preheater 3, and the chemical agglomerating agent is adsorbed on the dust surface, Under the action of the wetting agent, the dust enters the inside of the chemical agglomerating agent droplet, and through the molecular chain of the polymer binder with polar groups in the chemical agglomerating agent, multiple PM 2.5 or PM 2.5 Connect with coarse dust in a "bridging" way to promote PM 2.5 Agglomeration and growth; the chlorine-containing solid phase products precipitated by the evaporation of desulfurization wastewater and the chloride adsorbed on the fly as...

Embodiment 2

[0033] The other parameters of the above-mentioned device remain unchanged. Desulfurization wastewater is used to prepare 0.5%wt polyaluminum ferric chloride, and the wetting agent is 1%wt sodium succinate. Tested by the instrument, the total concentration of dust at the outlet of the desulfurization tower is 18mg / m 3 ;Use the online test of the electric low-voltage impactor ELPI, and the PM at the outlet of the desulfurization tower 2.5 The mass concentration is 9mg / m 3 ;Tested by high temperature condensation method, SO 3 Acid mist concentration 10mg / m 3 , using the VM-3000 mercury vapor monitor to measure the mercury concentration at the outlet of the desulfurization tower online at 4.6μg / m 3 .

Embodiment 3

[0035] Other parameters of the above-mentioned device remain unchanged. Desulfurization wastewater is used to prepare 0.5%wt polymer cellulose ether, and 1%wt sodium succinate is used as the wetting agent. Instrument test, the total concentration of dust at the outlet of the desulfurization tower is 17mg / m 3 ;Use the online test of the electric low-voltage impactor ELPI, and the PM at the outlet of the desulfurization tower 2.5 The mass concentration is 8mg / m 3 ;Tested by high temperature condensation method, SO 3 Acid mist concentration 13mg / m 3 , using the VM-3000 mercury vapor monitor to measure the mercury concentration at the outlet of the desulfurization tower online at 4.3μg / m 3 .

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Abstract

The invention discloses a coal-fired flue gas PM2.5/SO3/Hg combined removing method based on desulfurization wastewater evaporation treatment. According to the method, a chemical agglomerating agent composed of a polymer binder and a wetting agent is added into desulfurization wastewater; then the wastewater is sprayed into a flue, the thermal energy contained by flue gas can completely evaporate desulfurization wastewater before wastewater enters an electric deduster, during the evaporation process, the chemical agglomerating agent connects multiple PM2.5 or PM2.5 with crude dusts, PM2.5 is agglomerated and enlarged; chlorine-containing solid products precipitated during the desulfurization wastewater evaporation process and chlorides attached on the fly ash can promote the conversion of single-substance mercury to mercury in an oxide state or particle state; and at the same time, when the flue gas temperature is cooled to a range between the acid dew point and water dew point, the SO3 is condensed and absorbed on the dust surface. The enlarged particles, mercury in a particle state, and SO3 will enter an electric deduster along with the flue gas, then particles, mercury, and SO3 are eliminated in the electric deduster, and the mercury in an oxide state is eliminated by a desulfuration tower. The provided method can efficiently remove PM2.5, SO3, and Hg and is capable of achieving zero-discharge of desulfurization wastewater.

Description

technical field [0001] The invention relates to a method for purifying coal-fired flue gas, in particular to a coal-fired flue gas PM based on desulfurization wastewater evaporation treatment 2.5 / SO 3 The invention relates to a combined Hg removal method, which belongs to the technical field of environmental protection. Background technique [0002] PM with an aerodynamic diameter less than 2.5 μm 2.5 Pollution has become a prominent atmospheric environmental problem in my country, which leads to reduced atmospheric visibility and acid rain; the main reason is PM 2.5 The specific surface area is large, and it is easy to enrich various heavy metals and chemical carcinogens, but it is difficult to effectively capture them by conventional dust removal technology, resulting in a large amount of PM 2.5 into the atmosphere, PM 2.5 The technical development direction of effective control is mainly to set pretreatment measures in front of conventional dust removal equipment, so...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/50B01D53/64B01D50/00B01D51/02F23J15/02C02F9/10C02F1/16
Inventor 杨林军胡斌刘勇温涛源
Owner SOUTHEAST UNIV
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