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Method and device for removing fine particles in high-humidity gas fume

A technology for fine particulate matter and flue gas, applied in the field of removing fine particulate matter in flue gas, can solve the problems of unseen application and high energy consumption, and achieve the effect of simple process and low power consumption

Inactive Publication Date: 2011-05-18
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although in theory, increasing the amount of steam added can make fine particles condense and grow to a larger size, but due to the release of latent heat of steam phase change, the rise of smoke temperature after adding steam, and the homogeneous phase under too high water vapor supersaturation Nucleation, for PM 2.5 It is difficult for the submicron-sized particles in the medium to grow to 3-5mm or more only by the condensation of supersaturated water vapor on the surface of the particles, and too high steam addition will lead to excessive energy consumption
Impingement flow is one of the most effective methods to enhance interphase transfer and promote mixing (especially micro-mixing), but impingement flow technology has not been applied in steam phase change to promote the growth of fine particles

Method used

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  • Method and device for removing fine particles in high-humidity gas fume

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Effect test

Embodiment 1

[0031] The flue gas is produced by a fully automatic coal-fired boiler with a flue gas volume of 150Nm 3 / h, using limestone / gypsum wet desulfurization process, after desulfurization, the flue gas temperature drops from 110°C to 51°C, and the relative humidity is 97%. The desulfurization and purification of wet flue gas is divided into two streams by a pair of flue gas ducts and enters the main body of the impinging flow phase change chamber. A wire mesh demister is installed at the flue gas outlet of the phase change chamber. 3 When the flue gas is injected with 0.06kg of normal pressure saturated steam, the supersaturation S that can be achieved is about 1.22. After real-time online measurement by the electric low-pressure impactor, after adding steam, the concentration of fine particles at the outlet of the wire mesh demister is changed from 4.20′10 7 piece / cm 3 down to 1.37′10 7 piece / cm 3 , the number concentration removal rate increased by 67.4%.

Embodiment 2

[0033] The flue gas is produced by a fully automatic coal-fired boiler with a flue gas volume of 150Nm 3 / h, the flue gas desulfurization technology is the spray drying method, after desulfurization, the flue gas temperature drops from 157°C to 59°C, and the relative humidity is 63%. After the desulfurization and purification of wet flue gas is removed by the cyclone dust collector to remove coarse particles, it is divided into two streams and enters the main body of the impingement flow phase change chamber. A wire mesh demister is installed at the flue gas outlet of the phase change chamber. 3 When 0.12kg of steam is injected into the flue gas, the supersaturation degree that can be achieved is about 1.15. After real-time online measurement by the electric low-pressure impactor, after adding steam, the concentration of fine particles at the outlet of the wire mesh demister is changed from 5.62′10 7 piece / cm 3 down to 3.08′10 7 piece / cm 3 , the number concentration remova...

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Abstract

The invention relates to a method and a device for removing fine particles in high-humidity gas fume. The high-humidity gas fume enters a gas fume pipe; saturated steam under normal pressure is injected into the gas fume pipe and is premixed with the high-humidity gas fume; the high-humidity gas fume and the saturated steam under normal pressure enters a bombarding current phase change chamber main body and bombard each other so as to form a highly-turbulent bombardment area with highest concentration of fine particles in the center of the bombarding current phase change chamber main body and promote the saturated steam to be condensed on the surfaces of the fine particles; meanwhile, the fine particles of which the surfaces are condensed with water films collide each other to be coagulated to ensure that the granularity of the fine particles is increased further; and the coagulated and grown fine particles are removed by an efficient demister arranged at the gas fume outlet at the upper end of the bombarding current phase change chamber main body. The device consists of the gas fume pipe, the bombarding current phase change chamber main body, the efficient demister, a demister washing water system, and a washing waste liquor storage tank; a vapor nozzle is arranged in the gas fume pipe; and the efficient demister is arranged at the gas fume outlet at the upper end of the bombarding current phase change chamber main body.

Description

technical field [0001] The invention belongs to the technical field of removing fine particles in flue gas, and in particular relates to a method and a device for removing fine particles in high-humidity flue gas after absorption treatment, semi-dry desulfurization or wet washing and dust removal. Background technique [0002] Fine particulate matter (PM) with an aerodynamic diameter of less than 2.5 mm 2.5 ) pollution has become a prominent atmospheric environmental problem in my country. The main reason is that fine particles have a large specific surface area and are easy to accumulate various heavy metals and chemical carcinogens. However, conventional dust removal technology is difficult to effectively capture them, causing a large amount of fine particles to be discharged into the atmosphere. . For example, although the total dust removal efficiency of the electrostatic precipitator can reach more than 99%, the removal efficiency of fine particles is not high, and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D47/00
Inventor 杨林军熊桂龙陆斌鲍静静
Owner SOUTHEAST UNIV
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