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Filter bag for bag-type dust collector, bag-type dust collector and flue gas mercury removal method

A technology of bag filter and filter bag, which is applied in flue gas demercuration and filter bag field of bag filter, can solve the problems of low gas-solid contact rate, low mercury removal efficiency, uneven air distribution, etc., to save resources, The effect of high resource utilization value

Inactive Publication Date: 2016-06-01
FUJIAN LONGKING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method disclosed in the prior art for mercury removal by spraying powdered activated carbon into the flue gas has uneven gas flow distribution and low gas-solid contact rate, resulting in low mercury removal efficiency.

Method used

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  • Filter bag for bag-type dust collector, bag-type dust collector and flue gas mercury removal method

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preparation example Construction

[0044] The present invention has no special limitation on the preparation method of the mercury adsorbent, and the technical scheme for preparing metal-modified activated carbon fibers well known to those skilled in the art can be adopted.

[0045] The present invention provides the preparation method of filter bag described in above-mentioned technical solution, comprises the following steps:

[0046] The method of acupuncture is used to fix the mercury adsorbent on the base cloth, the mercury adsorbent is a metal modified activated carbon fiber, and the metal is a metal that forms an amalgam with mercury;

[0047] A filter material is covered on the base cloth fixed with the mercury adsorbent to obtain a filter bag.

[0048] The present invention adopts the acupuncture method to fix the mercury adsorbent on the base cloth, the mercury adsorbent is metal modified activated carbon fiber, and the metal is the metal that forms amalgam with mercury. The present invention has no ...

Embodiment 1

[0059] In this embodiment, mercury removal is carried out to the flue gas of the power plant in the following working conditions:

[0060] The generating set capacity of a power plant is 300MW, the average annual running time is 7000h, and the flue gas volume is 1,200,000Nm 3 / h, the original flue gas dust concentration is 15g / Nm 3 , the original flue gas mercury (Hg) concentration is 45μg / Nm 3 ; Use a bag filter to control the outlet dust concentration in the flue gas to 30mg / Nm 3 , a total of 12,000 8m long filter bags are required, each with a filter area of ​​3.3m 2 , the filter bag replacement cycle is three years, that is, the running time is 21000h;

[0061] Mercury removal requirements: the concentration of mercury (Hg) in the clean flue gas is less than 3μg / Nm 3 , the mercury removal efficiency requirement is 93.3%, that is, the total amount of heavy metal mercury (Hg) in flue gas is required to be removed in one year is 352.8kg.

[0062] Activated carbon fiber l...

Embodiment 2

[0065] In this embodiment, mercury removal is carried out to the flue gas of the power plant in the following working conditions:

[0066] The generating set capacity of a power plant is 300MW, the average annual running time is 7000h, and the flue gas volume is 1,200,000Nm 3 / h, the original flue gas dust concentration is 15g / Nm 3 , the original flue gas mercury (Hg) concentration is 45μg / Nm 3 ; Use a bag filter to control the outlet dust concentration in the flue gas to 30mg / Nm 3 , a total of 12,000 8m long filter bags are required, each with a filter area of ​​3.3m 2 , the filter bag replacement cycle is three years, that is, the running time is 21000h;

[0067] Mercury removal requirements: the concentration of mercury (Hg) in the clean flue gas is less than 3μg / Nm 3 , the mercury removal efficiency requirement is 93.3%, that is, the total amount of heavy metal mercury (Hg) in flue gas is required to be removed in one year is 352.8kg.

[0068] Activated carbon fiber l...

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Abstract

The invention provides a filter bag for a bag-type dust collector. The filter bag comprises a base cloth and a filter material. The filter bag is characterized in that a mercury adsorbent is arranged between the base cloth and the filter material, the mercury adsorbent comprises metal-modified active carbon fibers and the metal and mercury can form an amalgam. The filter bag is used in flue gas mercury removal. Flue gas to be treated goes through a bag-type dust collector with the filter bag so that dust is removed and flue gas mercury is removed. The method has full contact reaction time of mercury in flue gas and the mercury adsorbent in the filter bag. The mercury adsorbent has a high mercury adsorption saturation capacity. The metal in the mercury adsorbent and mercury form a stable amalgam so that adsorption efficiency and capacity are greatly improved. The filter bag maximally reduces flue gas dust-caused influence on mercury removal. The method has high mercury removal efficiency.

Description

technical field [0001] The invention relates to the technical field of flue gas pollution control, in particular to a filter bag of a bag filter, a bag filter and a method for removing mercury from flue gas. Background technique [0002] Mercury is a heavy metal with deposition toxicity. In early 2003, a survey report issued by the United Nations Environment Program (UNEP) pointed out that mercury, a bioaccumulative substance, poses a great threat to human health. FAO / WHO has also identified it as one of the priority harmful metals for research. The sources of mercury environmental pollution mainly include natural releases and human factors. Among them, during the combustion of a large amount of coal in coal-fired power plants, most of the mercury is discharged into the atmosphere along with the flue gas, becoming the largest source of man-made mercury pollution. If certain measures are not taken to control it, it will cause irreparable harm to the environment on which hum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D46/02B01D39/14B01D53/04
Inventor 王建春詹威全林驰前张哲然张原林文锋林春源金玉健陈旭荣陈星旺
Owner FUJIAN LONGKING
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