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Method of removing small particulate matters in coal-fired flue gas by combining chemical agglomeration with acoustic agglomeration

A technology of chemical agglomeration and fine particles, applied in the field of coal-fired particle removal in thermal power plants, can solve the problems of high energy consumption and low removal efficiency of fine particles, and achieve the effect of promoting collision agglomeration, enhancing collision probability and speed, and improving agglomeration effect.

Inactive Publication Date: 2017-09-15
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

A large number of experimental studies have shown that under the existing sound source conditions, the removal efficiency of fine particles using a single sonic agglomeration technology is low, and the energy consumption is large. Therefore, it is necessary to further explore and develop high-efficiency, energy-saving, and environmentally friendly fine particle removal technologies

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  • Method of removing small particulate matters in coal-fired flue gas by combining chemical agglomeration with acoustic agglomeration
  • Method of removing small particulate matters in coal-fired flue gas by combining chemical agglomeration with acoustic agglomeration

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Embodiment Construction

[0024] The method of the present invention will be described in further detail below in conjunction with the accompanying drawings.

[0025] A method for chemical agglomeration combined with acoustic agglomeration to remove fine particles of coal-fired flue gas, comprising the following steps:

[0026] 1) Introduce the desulfurized and denitrified wastewater into the sedimentation tank, and after flocculation and precipitation, take the supernatant and introduce it into the agglomerating agent addition tank;

[0027] 2) In the agglomeration tank, add a surfactant and a high polymer coagulant, stir well, and use this as a chemical agglomeration agent;

[0028] 3) Under the action of the metering pump and air compressor, the chemical agglomerating agent is sprayed into the flue in front of the dust collector through the double-flow atomizing nozzle;

[0029] 4) Install speakers on both sides of the flue, and guide the sound field through the sound waveguide;

[0030] 5) The dr...

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Abstract

The invention discloses a method of removing small particulate matters in coal-fired flue gas by combining chemical agglomeration with acoustic agglomeration to solve the problem that conventional dedusting equipment is hard to remove small particulate matters in flue gas for zero emission of desulfurization and denitrification wastewater in a coal-fired power plant. The method comprises the following steps: taking the supernate after the desulfurization and denitrification wastewater of the power plant is treated; adding a high polymer adhesive and a surfactant to prepare a chemical agglomerant; spraying the chemical agglomerant into a flue in front of a dedustor through an atomizing nozzle; adding a low-frequency sound field, wherein the small particulate matters of the coal-fired power plant are agglomerated under the combined action of chemistry and sound waves; and finally, removing the agglomerated particulate matters through a conventional dedustor. In a proper condition, 70% of the small particular matters which are smaller than 10 [mu]m can grow to 10[mu] or above through agglomeration. Therefore, the problem of zero emission of the wastewater is solved, and the problem of removal of small particulate matters in coal-fired flue gas is solved. The method has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of coal-fired particulate matter removal in thermal power plants, and in particular relates to a method for removing fine particles of coal-fired flue gas through chemical agglomeration combined with acoustic wave agglomeration. Background technique [0002] In April 2015, the state issued the "Water Pollution Prevention and Control Action Plan" in an effort to fully control the discharge of water pollutants, raising water environmental protection to the national strategic level. Coal-fired power plants have always been the largest industrial water users in my country, and zero discharge of wastewater from power plants is an inevitable trend. Looking at the current status of wastewater treatment in domestic thermal power plants, power plants that can achieve "zero discharge" of wastewater are not optimistic. [0003] The traditional method treats the wastewater through procedures such as neutralization, sedi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D49/00
CPCB01D49/006
Inventor 吴瑞鹏沈国清杨宇辰徐媛媛何春龙黄晓宇张世平安连锁
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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