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Method and device for cooperatively enhancing PM2.5 (Particulate Matter 2.5) removal and smoke afterheat deep utilization

A flue gas waste heat and removal technology, which is applied in the field of energy saving and emission reduction of industrial boilers and coal-fired power plant boilers, to achieve the effects of reducing the amount of flue gas under working conditions, increasing the moisture content of flue gas, and promoting the improvement of efficiency

Active Publication Date: 2014-06-18
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Purpose of the invention: the present invention is aimed at traditional pollutant control facilities to PM 2.5 There is an urgent need to improve the removal efficiency of coal-fired power stations and industrial boilers, and the demand for waste heat utilization of flue gas in coal-fired power stations and industrial boilers provides a method of applying flue gas humidification and tempering, water vapor phase change enhanced PM 2.5 method and device for realizing deep utilization of flue gas waste heat

Method used

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  • Method and device for cooperatively enhancing PM2.5 (Particulate Matter 2.5) removal and smoke afterheat deep utilization

Examples

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Effect test

Embodiment 1

[0026] The flue gas is produced by a fully automatic coal-fired boiler with a flue gas volume of 300Nm 3 / h, supplemented by a SAG-410 aerosol generator to add an appropriate amount of coal-fired fly ash to the flue gas, so that the dust concentration in the coal-fired flue gas is 4850mg / m 3 , where PM 2.5 The concentration is 172mg / m 3 . Along the flue gas flow direction, there are flue gas humidification devices, electrostatic precipitators, low-temperature economizers, and limestone / gypsum flue gas desulfurization systems. The electrostatic precipitator has a three-electric field structure, the cathode is a conventional acupuncture electrode, and the distance between the plates is 0.30m. The low-temperature economizer heat exchange tubes are made of finned tubes and ND corrosion-resistant steel. The wet desulfurization tower adopts a spray tower with a tower diameter of 200mm and a tower height of 4500mm, and a baffle demister is installed on the top of the spray tower....

Embodiment 2

[0028] Add polyferric sulfate and polyether modified silicone to the atomized hot water sprayed into the flue gas humidification device to make a chemical agglomeration agent solution. The mass percentage composition of the agglomeration agent solution is: 0.05% polyferric sulfate, 0.005% poly Ether modified silicone, all the other are the same as in Example 1. Tested by the WJ-60B pitot tube parallel automatic smoke sampler, the dust concentration at the outlet of the electrostatic precipitator and the outlet of the desulfurization tower is 37mg / m3 3 、13mg / m 3 ; Among them, the electric low-voltage impactor ELPI online test is used, and the outlet of the electrostatic precipitator and the outlet of the desulfurization tower are PM 2.5 The mass concentration is 12mg / m 3 , 5mg / m 3 .

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Abstract

The invention relates to a method and a device for cooperatively enhancing PM2.5 (Particulate Matter 2.5) removal and smoke afterheat deep utilization. The device is composed of a smoke humidifying device, an electric dust remover, a low-temperature coal economizer and a wet desulphurization tower. The method comprises the following steps: before smoke enters the electric dust remover, spraying atomized hot water to carry out humidifying and tempering treatment; enhancing the PM2.5 capturing of the electric dust remover and improving the moisture content of the smoke; providing the atomized hot water by the low-temperature coal economizer; arranging the low-temperature coal economizer between the electric dust remover and the desulphurization tower to recycle the sensible heat released by cooling the smoke to obtain the smoke with high relative humidity; then adjusting an inlet gas-liquid temperature difference and a desulphurization liquid-gas ratio of the subsequent wet desulphurization tower to enable the smoke with the high relative humidity in the desulphurization tower to be over-saturated in a desulphurization and washing process; and carrying out nucleation condensation on over-saturated water steam on the surface of PM2.5 so as to enable the granularity of the PM2.5 to grow and be captured. According to the method and the device, the capturing effect on the PM2.5 by the electric dust remover and a wet smoke desulphurization system can be enhanced and the smoke afterheat can also be recycled.

Description

technical field [0001] The invention belongs to the technical field of energy saving and emission reduction of coal-fired power station boilers and industrial boilers, and in particular relates to a synergistically enhanced electric dust removal and wet flue gas desulfurization system for removing PM 2.5 and a method and device for deep utilization of residual heat of coal-fired flue gas. Background technique [0002] PM 2.5 It is the main cause of smog weather and has become a prominent atmospheric environmental problem in my country; coal-fired power plant boilers and industrial boilers are the main cause of PM in my country's atmosphere 2.5 one of the main sources of . At present, more than 80% of the large and medium-sized coal-fired power plants in my country adopt the dedusting and desulfurization process of electric precipitator + wet flue gas desulfurization system, and the application of this process in coal-fired industrial boilers is also increasing day by day. ...

Claims

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Application Information

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IPC IPC(8): F23J15/04F22D1/00B03C3/16
Inventor 杨林军潘丹萍吴昊刘勇姜业正
Owner SOUTHEAST UNIV
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