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Method for cooperatively controlling multiple pollutants of flue gas by using charge adsorbent strengthened electric bag device

A collaborative control and adsorbent technology, applied in chemical instruments and methods, combined devices, separation methods, etc., can solve the problem of low utilization rate of mercury removal and trapping of fine particles, increasing the structure size of dust removal devices, and inability to achieve coagulation effect. and other problems, to achieve the effect of removing heavy metals, increasing the structure size, and low operating costs

Active Publication Date: 2014-12-10
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for the general electric bag composite device, adding a coagulation electric field between the electric area and the bag area will obviously increase the structure size of the dust removal device.
In addition, using a positive high electric field alone cannot achieve a good coagulation effect
In addition, since a large number of electrodes are arranged in the condensation area, it is difficult for the adsorbent to be sprayed into the area to distribute evenly, and the injected adsorbent will be quickly captured by the condensation electrodes, making it effective in mercury removal and fine particle capture. Utilization rate is not high

Method used

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  • Method for cooperatively controlling multiple pollutants of flue gas by using charge adsorbent strengthened electric bag device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] like figure 1 As shown, the prepared adsorbent is first placed in the adsorbent container 1, the adsorbent is sent into the spray gun 3 by compressed air 2, the adsorbent is charged by the high voltage power supply 4, and then the positively charged adsorbent is charged by the spray gun 3 Adsorbent insulating spray pipe 5 sprays into the electro-bag junction area 7 between the electro-area 6 (electrostatic precipitator area) and the bag area 8 (bag-type precipitator area). The positively charged adsorbent and the negatively charged dust, heavy metals and condensable substances in the flue gas pass through the electric zone to coagulate to form large particle size particles. Large particle size particles are captured by the filter bag when the flue gas passes through the bag area 8 . The clean flue gas passes through the bag area and is discharged from the outlet, while the captured large-size particles fall off from the filter bag, are treated by the adsorbent recovery...

Embodiment 2

[0044] The device and method are the same as those in Example 1, except that magnesium oxide powder with a particle size of 40-60 μm is added in a proportion of 30% while spraying on the iron-titanium adsorbent. The results show that after the adsorbent is mixed with magnesium oxide, the concentration of soot in the outlet flue gas can be reduced to 10mg / m 3 around, the removal rate of mercury remains basically the same, but the SO 3 The removal efficiency can be increased to about 92%. It can be seen that the mixed use of adsorbent and magnesium oxide can significantly improve the removal efficiency of various pollutants.

Embodiment 3

[0046] The device and method are the same as examples 1 and 2, and the experiment is carried out mainly on the recovery and separation of the adsorbent. A standard cyclone separator with a diameter of 250 mm is used to process the mixture of adsorbent and fine particles collected in the bag area. According to the result analysis, after the adsorbent is separated by two high-speed cyclones, the fine particles attached to the surface can basically be stripped off and collected separately from the adsorbent through inertial separation. The sorbent can be reused.

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Abstract

The invention relates to a method for cooperatively controlling multiple pollutants of a flue gas by using a charge adsorbent strengthened electric bag device. The method comprises the steps of: pre-charging (positive charges) a mercury-removing adsorbent through an outer charge spray gun and spraying the mercury-removing adsorbent to an electric bag combined region of the electric bag compound device through an insulating conveying pipe; capturing and collecting fine particles, heavy metals (mercury and the like), congealable substances (SO3 and the like) and the like to the adsorbent to form big particles which are good for a filtering bag to capture and collect by utilizing Coulomb coagulation function caused by mutual attraction between adsorbent particles with positive charges and fine particles which are charged with negative charges while passing an electric region, but are not captured and collected; and finally, capturing and collecting the coagulated big particles by utilizing a bag-type dust collector to realize the purpose of cooperatively removing fine particles, heavy metals and congealable substance in the flue gas. Compared with the prior art, the method for cooperatively controlling multiple pollutants of the flue gas by using the charge adsorbent strengthened electric bag device, disclosed by the invention, has the advantages of high efficiency, low cost and the like.

Description

technical field [0001] The invention belongs to the emission control technology of coal-fired flue gas fine particles, heavy metals and condensable substances in the field of environmental protection, and in particular relates to a method for coordinated control of multi-pollutants in flue gas by a charged adsorbent enhanced electric bag device. Background technique [0002] PM 2.5 The pollution problem has aroused great concern of the society. as a global PM 2.5 One of the highest areas, my country has clearly defined PM in the newly revised "Ambient Air Quality Standards". 2.5 Pollution is the object of monitoring and evaluation. Therefore, PM 2.5 It will become the main task of air pollution control in the next few years, and its technology research and development and application promotion will become one of the most important tasks in the field of atmospheric environmental protection. And coal-fired and industrial kiln flue gas is the cause of PM 2.5 The main reas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D51/04B01D50/00B01D53/06
Inventor 晏乃强瞿赞谢江坤张文琪胡林刚
Owner SHANGHAI JIAO TONG UNIV
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