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Device and method for promoting fine particle matters to be removed in coal-burning wet flue gas desulfuration process

A wet flue gas desulfurization and fine particle technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problem of difficult to capture fine particles, and achieve efficient removal, reduced steam consumption, The effect of removing coal fly ash

Inactive Publication Date: 2012-07-04
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, adding a pre-scrubber can only increase the SO 2 and the removal rate of coarse dust, it is still difficult to capture fine particles

Method used

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  • Device and method for promoting fine particle matters to be removed in coal-burning wet flue gas desulfuration process
  • Device and method for promoting fine particle matters to be removed in coal-burning wet flue gas desulfuration process
  • Device and method for promoting fine particle matters to be removed in coal-burning wet flue gas desulfuration process

Examples

Experimental program
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Effect test

Embodiment 1

[0019] According to the present invention, a method for promoting the removal of fine particles in a coal-fired wet flue gas desulfurization process is as follows: figure 1 , figure 2Shown: the high-temperature coal-fired flue gas enters the pre-washing tower 1, and after contacting with the washing liquid, the flue gas temperature drops from 100-150°C to 50-65°C, is saturated or nearly saturated by water vapor, and removes coarse particles in the flue gas , and then the mist is removed by the pre-washing tower demister 3 and 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 supersaturated state, and the supersaturated water vapor takes fine particles as condensation nuclei Nucleation condensation occurs on the surface of fine particles, and at the same time, diffusion swimming and thermophoresis are produced, which increases the particle size and quality...

Embodiment 2

[0022] Such as image 3 As shown, the difference from Example 1 is that a steam phase change chamber is not specially set between the flue gas outlet of the pre-scrubber and the flue gas inlet of the desulfurization main tower, but the height of the pre-scrubber 1 is appropriately increased to demist the pre-scrubber The space above the device 3 is used as a steam phase change chamber 4, and an appropriate amount of steam is injected. A high-efficiency demister and a demister flushing water nozzle 7 are installed at the outlet of the flue gas at the top of the tower. The flue gas enters the desulfurization after pre-washing and removal of some fine particles. Main tower, all the other are with embodiment 1.

Embodiment 3

[0024] A method for promoting the removal of fine particles in a coal-fired wet flue gas desulfurization process, the steps are: remove fine particles once: after the coal-fired flue gas is pre-washed and dust-removed, it is saturated or nearly saturated with water vapor, and water mist is removed After entering the steam phase change chamber, the residence time of the flue gas in the steam phase change chamber is ≥50-200 milliseconds, injecting saturated steam at normal pressure to establish the supersaturated water vapor environment required for the condensation and growth of fine particles, and the condensation and growth The fine particles are partially removed by the high-efficiency demister placed at the flue gas outlet of the steam phase change chamber, and the removal rate of the primary concentration is 50-60%; the secondary removal of fine particles: the supersaturated flue gas is removed by the steam phase change chamber After removing part of the fine particles, it ...

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Abstract

The invention provides a device and a method for promoting fine particle matters to be removed by applying a steam phase-change principle, aiming at the character of high flue gas and water vapor content in a coal-burning WFGD process with a pre-washing tower. The device for promoting the fine particle matters to be removed in the coal-burning wet flue gas desulfuration process comprises the pre-washing tower, a steam phase-change chamber and a main desulfurizing tower; the steam phase-change chamber is provided with a waste liquor washing outlet, a flue gas inlet and a flue gas outlet; the flue gas inlet is connected with a flue gas outlet of the pre-washing tower; the flue gas outlet is connected with a flue gas inlet of the main desulfurizing tower; and a steam nozzle, a demister and awashing water nozzle are sequentially arranged between the flue gas inlet and the flue gas outlet of the steam phase-change chamber.

Description

1. Technical field [0001] The invention belongs to a technology for promoting the removal of fine particles in coal-fired flue gas, in particular to a device for promoting the removal of fine particles by applying the principle of steam phase change in a coal-fired wet flue gas desulfurization process equipped with a pre-washing tower 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 particles to be discharged ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/78B01D53/50B01D47/00
Inventor 杨林军鲍静静颜金培宋士娟沈湘林
Owner SOUTHEAST UNIV
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