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Device and method for enhancing removal of fine particle substances in flue gas desulfurization process of fire coal

A technology of fine particles and desulfurization process, which is applied in the direction of combined devices, separation methods, chemical instruments and methods, etc., can solve the problems of fine particles discharged into the atmosphere and low capture efficiency, and achieve enhanced phase change effect, simple process, The effect of increasing relative humidity

Inactive Publication Date: 2010-06-16
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The flue gas after desulfurization is discharged into the chimney through the electrostatic precipitator, flue gas reheater, and induced draft fan; therefore, the removal effect of fine particles depends on the desulfurization reaction tower or the subsequent electrostatic precipitator of the activator, and the collection efficiency is relatively high. Low, causing a large amount of fine particles to be discharged into the atmosphere

Method used

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  • Device and method for enhancing removal of fine particle substances in flue gas desulfurization process of fire coal
  • Device and method for enhancing removal of fine particle substances in flue gas desulfurization process of fire coal
  • Device and method for enhancing removal of fine particle substances in flue gas desulfurization process of fire coal

Examples

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Effect test

Embodiment 1

[0017] In the coal-fired spray drying flue gas desulfurization process of the present invention, the method of using steam phase change to improve the removal of fine particles is as follows: figure 1 Shown: the dust-laden flue gas produced by the coal-fired boiler 1 first enters the desulfurization reaction tower 2, and is sprayed with lime slurry. After the atomized lime slurry contacts the high-temperature flue gas, the water in the slurry begins to evaporate, and the flue gas cools down and humidifies. The smoke temperature drops from 140-160°C to 50-65°C, the relative humidity increases from 5-8% to over 50-60%, and the near-adiabatic saturation temperature is 5-15°C. After the desulfurization and purification flue gas is removed from the coarse particles by the electrostatic precipitator 3, it enters the steam phase change chamber 4, and an appropriate amount of saturated steam at normal pressure is injected through the steam nozzle 5 to make the flue gas reach a supersat...

Embodiment 2

[0020]The method of applying steam phase change to improve the removal of fine particles in the tail humidification activation flue gas desulfurization process of the coal-fired furnace of the present invention is as follows: figure 2 As shown, the difference from Example 1 is that limestone powder is sprayed into the coal-fired boiler furnace 1, and the flue gas enters the humidification activator 2 after the first step of desulfurization, and is sprayed with atomized water, which evaporates rapidly and the smoke The temperature of the gas decreases and the humidity increases. The flue gas temperature at the outlet of the activator is 55-60° C., and the relative humidity increases from 5-8% to more than 50-60%; the rest are the same as in Example 1.

Embodiment 3

[0022] Such as image 3 As shown, the difference from Examples 1 and 2 is that the steam phase change chamber is arranged vertically, the flue gas from the electrostatic precipitator 3 enters from the lower part of the steam phase change chamber 4, and steam is injected from the upper part of the phase change chamber through the steam nozzle 5 , contact with the flue gas in countercurrent, and the fine particles trapped by the mist eliminator 6 are discharged through the flushing waste liquid outlet located at the bottom of the steam phase change chamber.

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Abstract

The invention aims at the characteristic of higher relative humidity of the flue gas of fire coal after spray drying, calcium spraying in a furnace, tail humidification, activation and desulfurization are carried out on the flue gas of the fire coal and provides a device and a method which apply a vapour phase change principle to realize the effective removal of SO2, also induce the coagulation and the growth of fine particle substances and remove the fine particle substances with high efficiency. The device for enhancing the removal of the fine particle substances in a flue gas desulfurization process of the fire coal comprises a desulfurizing tower or a humidification activator, an electrostatic dust collector, a flue gas reheater and a draught fan, wherein the electrostatic dust collector, the flue gas reheater and the draught fan are sequentially connected with the desulfurizing tower or the humidification activator by pipelines, a vapour phase change chamber is provided with a rinsing waste liquid outlet, a flue gas inlet and a flue gas outlet, the flue gas inlet is connected with a flue gas outlet of the electrostatic dust collector, the flue gas outlet is connected with the flue gas reheater, a vapour nozzle, a defogger and a rinsing water nozzle are sequentially arranged between the flue gas inlet and the flue gas outlet of the vapour phase change chamber, an inside lining of the vapour phase change chamber is provided with an anticorrosion material with low surface energy, and the anticorrosion material with low surface energy has double effects of increasing the phase change effect and preventing corrosion.

Description

1. Technical field [0001] The invention belongs to a technology for improving the removal of fine particles in coal-fired flue gas, in particular to a method of applying the principle of steam phase change to improve the removal of fine particles in coal-fired spray drying and calcium spray tail humidification activation flue gas desulfurization devices and methods. 2. Background technology [0002] Inhalable particulate matter (PM 10 ) especially fine particulate matter (PM) with an aerodynamic diameter of less than 2.5 μm 2.5 ) pollution has become a prominent atmospheric environmental problem in my country, and has increasingly attracted great attention from all countries in the world. The main reason is that PM 2.5 Fine particles have a large specific surface area and are easy to accumulate various heavy metals and chemical carcinogens. However, it is difficult for conventional dust removal technology to effectively capture them, causing a large amount of fine particl...

Claims

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Application Information

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IPC IPC(8): B01D53/80B01D50/00B01D53/50
Inventor 杨林军鲍静静颜金培刘锦辉沈湘林
Owner SOUTHEAST UNIV
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