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Flue gas demercuration adsorbent

An adsorbent and mercury removal technology, which is applied in other chemical processes, separation methods, dispersed particle separation, etc., can solve the problems of high cost of adsorbent preparation, environmental pollution, etc., achieve good mercury removal adsorption effect, reduce mercury removal cost, Effects that are cheap to manufacture

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Problems solved by technology

However, it still has the disadvantage of high cost of adsorbent preparation
[0006] The fly ash collected from the flue gas after coal combustion in coal-fired power plants is generally disposed of by landfill, which is likely to cause environmental pollution

Method used

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Embodiment Construction

[0016] The present invention will be further described in detail below in conjunction with specific implementation examples and tests.

[0017] A flue gas mercury removal adsorbent, which is prepared by the following method: using the following components in parts by weight, 2-6% sodium bromide, 2-5% polyethylene, 2-5% rice husk, 5-10 % of calcium oxide, 10-25% of Hunan clay, and the balance of fly ash. Mix the components and add water to mix thoroughly, then extrude and granulate to form granules with a particle size of 30-50mm, and then mix them at 900-1100 Sinter at high temperature for 2-4 hours to obtain the desired flue gas demercuration adsorbent.

[0018] The applicant first uses a series of experiments to conduct experiments on each component to obtain the optimal ratio of each component. During the experiment, the three parameters of particle size, sintering temperature and sintering time in the preparation method were respectively taken as fixed values ​​of 40mm, 1...

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Abstract

The invention discloses a flue gas demercuration adsorbent. The adsorbent is characterized in that a method for preparing the flue gas demercuration adsorbent comprises the following steps of: mixing 10 to 25 weight percent of clay, 2 to 5 weight percent of polyethylene, 2 to 5 weight percent of rice hull, 5 to 10 weight percent of calcium oxide and the balance of pulverized fuel ash; adding water into the mixture for uniformly mixing; extruding, pelletizing and molding the mixture into particles of which the particle size is between 30 and 50 millimeters; and sintering the particles at the temperature of between 900 and 1,100 DEG C for 2 to 4 hours to obtain the flue gas demercuration adsorbent. The invention discloses the novel flue gas demercuration adsorbent. Since the pulverized fuelash is taken as a main raw material, other ingredients are only simple and conventional raw materials and a preparation method of the adsorbent is a conventional pelletizing or sintering method and the like, and the manufacturing cost of the adsorbent is lower than that of conventional adsorbents. Therefore, demercuration cost can be greatly lowered in a demercuration process.

Description

technical field [0001] The invention relates to the technical field of flue gas demercuration, in particular to a novel material flue gas demercury adsorbent. Background technique [0002] Domestic flue gas mercury removal technology research mainly focuses on the development of high-efficiency adsorbents and how to effectively use existing pollution control equipment to improve mercury removal efficiency and take the road of compound pollution control. [0003] Flue gas desulfurization units and selective catalytic reduction equipment can capture mercury well. The wet desulfurization device can remove 80%-95% of the oxidized mercury in the flue gas, but the capture effect of the gaseous mercury insoluble in water is not significant, and it is necessary to use an oxidant to oxidize the elemental mercury first, which has secondary pollution and production issues such as higher costs. The Selective Catalytic Reduction (SCR) device can reduce Hg while reducing NOx 0 Oxidized...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30B01D53/02B09B3/00
Inventor 刘清才高威杨剑鹿存房董凌燕文娟姚春玲保思敏刘浪
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