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Flue gas purification system capable of simultaneously realizing high-efficiency dust removal and mercury removal

A flue gas purification system and mercury removal technology, applied in chemical instruments and methods, lighting and heating equipment, combined devices, etc., can solve the problems of low dust removal efficiency of electrostatic precipitators, reduce usage, improve adsorption effect, reduce The effect of usage

Active Publication Date: 2014-04-16
HUANENG POWER INT INC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the dust removal efficiency of the electrostatic precipitator is low. If it is required to meet the smoke and dust emission of coal-fired power plants proposed in the new standard, it will be lower than 30mg / m 3 A batch of original electrostatic precipitators that cannot meet the smoke emission limit will be transformed into high-efficiency precipitators such as electric bag composite precipitators

Method used

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  • Flue gas purification system capable of simultaneously realizing high-efficiency dust removal and mercury removal
  • Flue gas purification system capable of simultaneously realizing high-efficiency dust removal and mercury removal

Examples

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Effect test

Embodiment 1

[0033] like figure 1 As shown, a flue gas purification system that can simultaneously achieve high-efficiency dust removal and mercury removal includes an inlet smoke box 5, the inlet smoke box 5 is connected to the electrostatic dust removal area 6, the outlet flue 13 is connected to the bag dust removal area 14, and the electrostatic dust removal area 6 is connected to the cloth bag dust removal area 14. Adsorbent injection areas 3 are arranged between the dust removal areas 14, and a spray grid 2 is arranged on the top of the adsorbent injection areas 3, so as to inject powdery mercury removal adsorbent and / or fine ash into the flue gas.

[0034] There are non-closed baffles 9 between the electrostatic precipitation area 6 and the adsorbent injection area 3, and between the adsorbent injection area 3 and the bag dust removal area 14. Among them, the electrostatic precipitation area 6 and the injection grid of the adsorbent injection area 3 The end where the grid 2 is locate...

Embodiment 2

[0042] like figure 2 As shown, the difference from the first embodiment is that slaked lime is used as the adsorbent, which can realize the simultaneous removal of SOx and mercury. Therefore, the system also has a certain desulfurization capacity while realizing high-efficiency dust removal and mercury removal. The spray cooler 4 is arranged in the upper part of the sorbent injection zone 3, not only to prevent the flue gas temperature from being too high, thereby ensuring the service life of the cloth bag and the efficiency of adsorption and removal of mercury; After contacting, the activity of slaked lime for desulfurization and mercury removal can be enhanced.

[0043] When the system of the present invention is in operation, the flue gas first enters the electrostatic precipitator area 6 from the inlet smoke box 5 to remove most of the dust of large particles; then in the adsorbent injection area 3, the adsorbent is sprayed into the flue gas; then The flue gas passes th...

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Abstract

The invention discloses a flue gas purification system capable of simultaneously realizing high-efficiency dust removal and mercury removal. The system comprises an inlet smoke box, wherein the inlet smoke box is communicated with an electrostatic dust removal region; an outlet flue is communicated with a cloth bag dust removal region; an adsorbent spray region is arranged between the electrostatic dust removal region and the cloth bag dust removal region; flue gas firstly passes through the electrostatic dust removal region to remove most of large-particle dust; then an adsorbent is sprayed into the flue gas in the adsorbent spray region; next, the flue gas passes through the cloth bag dust removal region to remove the remaining dust and added adsorbent to realize high-efficiency dust removal; since the adsorbent is attached to the surface of a cloth bag, high-efficiency mercury removal is also realized; fine dust removed by a cloth bag dust collector comprises small-particle dust and the adsorbent; a part of the fine dust passes through a fine dust return device to be conveyed back to the adsorbent spray region and then sprayed into the flue gas to remove the mercury, and the remaining part of fine dust enters a fine dust cabin; and the device can simultaneously realize good dust removal and mercury removal effects with low cost.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a flue gas purification system capable of simultaneously realizing high-efficiency dust removal and mercury removal. Background technique [0002] With the development of science and technology and the improvement of environmental awareness, more and more attention has been paid to the impact of pollutant emissions from coal-fired power plants on the environment. In the latest "Emission Standard of Air Pollutants for Thermal Power Plants" (GB13223-2011), the smoke and dust emission limit of coal-fired power plants is changed from the original 50mg / m 3 down to 30mg / m 3 , and proposed for the first time that the mercury and its compounds emitted by coal-fired power plants should reach 0.03 mg / m 3 The emission limit requirements of other pollutants have also put forward higher requirements. [0003] At present, my country already has mature desulfuriz...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D50/00B01D53/10F23J15/04
Inventor 钟犁肖平江建忠
Owner HUANENG POWER INT INC
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