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Method and device for promoting simultaneous removal of mercury and fine particulate matters during wet flue gas desulfurization

A technology for wet flue gas desulfurization and fine particles, which is applied in chemical instruments and methods, separation methods, and separation of dispersed particles. It can solve the problems of high water vapor content and ineffective removal, and achieve huge economic and social benefits. Wide application prospects and simple process

Inactive Publication Date: 2015-09-30
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the existing wet flue gas desulfurization (WFGD) method can not effectively remove PM 2.5 , mercury and high water vapor content in desulfurized flue gas, the purpose of this invention is to provide a method for promoting the coordinated removal of mercury and fine particles in wet flue gas desulfurization, using water vapor phase change technology to promote the condensation and growth of fine particles And gaseous mercury and particulate mercury condense on the surface of fine particles to achieve the effect of synergistic and efficient removal of fine particles and mercury

Method used

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  • Method and device for promoting simultaneous removal of mercury and fine particulate matters during wet flue gas desulfurization
  • Method and device for promoting simultaneous removal of mercury and fine particulate matters during wet flue gas desulfurization
  • Method and device for promoting simultaneous removal of mercury and fine particulate matters during wet flue gas desulfurization

Examples

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Embodiment 1

[0031] The original flue gas flow generated by the fully automatic coal-fired boiler is 150Nm 3 / h, the number concentration of fine particles is 5.02×10 7 Pieces / cm 3 , the total mercury concentration is 1.50 μg / m 3 ; After limestone-gypsum wet desulfurization, the outlet flue gas temperature of wet desulfurization tower 1 is reduced from 120 ℃ to 55 ℃, and the relative humidity is 97%; it enters the water vapor phase change chamber 4, and a wire mesh is installed at the outlet of the phase change chamber to remove the gas. Mist, inject 0.06kg / m through steam nozzle 5 in the phase change chamber 3 (Fume) saturated steam at atmospheric pressure. After measurement, after the water-vapor phase transition is applied in the wet desulfurization process, the number concentration of fine particles in the flue gas passing through the outlet of the wire mesh demister can be reduced from 4.02×10 7 Pieces / cm 3 down to 1.65×10 7 Pieces / cm 3 , adding steam can increase the removal e...

Embodiment 2

[0033] like image 3 As shown, the difference from Example 1 is that the water-vapor phase change chamber 4 is not separately set after the wet desulfurization tower 1, but the height of the wet desulfurization tower 1 is appropriately increased, so that the space above the wet desulfurization tower demister 3 As the water-vapor phase change chamber 4, and inject an appropriate amount of normal pressure saturated water vapor, a high-efficiency wire mesh demister is arranged at the outlet of the water-vapor phase change chamber 4 at the top of the tower, and the rest are the same as those in Example 1.

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Abstract

The invention provides a method and a device for promoting simultaneous removal of mercury and fine particulate matters during wet flue gas desulfurization by use of the water-vapor phase change principle and aims to overcome the shortcomings that flue gas in low in temperature and high in humidity and PM2.5 and mercury cannot be effectively removed after wet desulphurization. Coal-fired flue gas subjected to wet desulphurization enters a water-vapor phase change chamber, and normal-pressure saturated vapor is injected to enable flue gas to be supersaturated; on one hand, the supersaturated water-vapor drags gaseous mercury to be collected on the surfaces of particulate matters through both the thermophoresis and diffusiophoresis actions, and on the other hand, fine particulate matters on which particulate mercury is collected are taken as condensation nucleuses, nucleation and condensation occur on the surfaces of the condensation nucleuses, so that the fine particulate matters are increased in particle diameter and mass, and dust-containing drop mercury which is increased in size by condensation is finally removed by an efficient demister. A conventional coal-fired wet desulphurization device is improved by additionally arranging the water-vapor phase change chamber behind a desulfurization tower, so that once vapor is added, the wet desulphurization device can play the role of simultaneous removal of mercury and fine particulate matters. The method and the device can be widely used for wet flue gas desulfurization in coal-fired power plants and have huge economic benefits and social benefits.

Description

technical field [0001] The invention relates to a technology for promoting the coordinated removal of mercury and fine particles in coal-fired flue gas, in particular to a method and device for promoting the coordinated removal of mercury and fine particles by applying the principle of water vapor phase change in wet flue gas desulfurization. Background technique [0002] Fine particulate matter PM with aerodynamic diameter less than or equal to 2.5 microns 2.5 Pollution has become a prominent atmospheric environmental problem in my country. It is an important factor leading to major environmental problems such as reduced atmospheric visibility, acid rain, haze weather, and global climate change, and has increasingly attracted the attention of countries around the world. The main reason is that PM 2.5 The specific surface area is large, and it is easy to enrich various heavy metal pollutants (such as As, Se, Hg, Cr, Pb, Cd, etc.), and become the carrier and reaction bed of h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D51/02B01D53/00B01D53/74B01D53/48
Inventor 鲍静静马凌于贤群杨宏旻罗倩妮韩风霞沈星驰杨乾
Owner NANJING NORMAL UNIVERSITY
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