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 desulfur

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

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0016] Example 1:

[0017] The method of applying steam phase change to improve the removal of fine particles in the coal-fired spray drying flue gas desulfurization process of the present invention is as follows figure 1 Shown: the dust-containing flue gas produced by coal-fired boiler 1 first enters the desulfurization reaction tower 2, and is sprayed into lime slurry. After the atomized lime slurry contacts the high-temperature flue gas, the moisture in the slurry begins to evaporate, and the flue gas is cooled and humidified. The smoke temperature drops from 140-160℃ to 50-65℃, the relative humidity increases from 5-8% to more than 50-60%, and the near-adiabatic saturation temperature is 5-15℃. After the desulfurization and purification flue gas is removed by the electrostatic precipitator 3 to remove coarse particles, it enters the steam phase change chamber 4, and injects an appropriate amount of normal pressure saturated steam through the steam nozzle 5 to make the flue gas...

Example Embodiment

[0019] Example 2:

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

Example Embodiment

[0021] Example 3:

[0022] Such as image 3 As shown, the difference from Embodiments 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. , In countercurrent contact with the flue gas, the fine particles captured by the demister 6 are discharged through the flushing waste liquid outlet provided at the bottom of the vapor 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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