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Flue gas hydrargyrum-removing method by catalytic oxidation

A technology of catalytic oxidation and mercury oxidation, which is applied in chemical instruments and methods, separation methods, and separation of dispersed particles. It can solve the problems of difficult elemental mercury, difficult material regeneration, secondary pollution, etc., and achieves small matrix damage and reduced operating costs. , the effect of reducing processing costs

Inactive Publication Date: 2005-11-23
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide an economical and practical catalytic oxidation flue gas demercury method, which can effectively remove mercury in flue gas, and While the adsorbent can be efficiently regenerated, the adsorbed mercury can be recycled, and no secondary pollution to the environment will be caused.

Method used

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  • Flue gas hydrargyrum-removing method by catalytic oxidation

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Effect test

Embodiment 1

[0029] 6 kg of catalyst Fe6: supported on 60 kg of specific surface area of ​​120m 2 / g honeycomb Al2O3, the load is 10%, this material is put into the catalytic bed, the catalytic bed is located behind the particle collection device ESP, the flue gas flow rate is 5000m 3 / h, the imported mercury concentration is 10-30μg / m 3 The adsorbent of the adsorption bed adopts a honeycomb metal filter adsorbent with a total weight of 50 kg and a capacity of 20 mg / g of mercury oxide. It can absorb about 1000g of mercury oxide. The concentration of mercury in the flue gas treated by the catalytic bed and the adsorption bed is 100ng / m3 3 , direct emptying. The activity of the catalyst decreases due to the influence of fly ash on the surface, and the catalyst regeneration treatment is carried out every 2 months. The heater preheats the above-mentioned cold air to obtain regeneration gas with a temperature of 480°C and a flow velocity of 7m / s. The regeneration gas passes through the cata...

Embodiment 2

[0031] Catalyst SCR3# loaded on a specific surface area of ​​120m 2 / g, on honeycomb aluminum oxide with a weight of 45 kg, put it into the adsorption bed, the adsorption bed is located behind the electrostatic precipitator (ESP), and the flue gas flow rate is 15000m 3 / h, the imported mercury concentration is 0.3-0.5mg / m 3 The material in the following adsorption bed is honeycomb-shaped activated carbon with a total weight of 100 kg and an adsorption capacity of mercury oxide of 360 mg / g. After passing through the catalytic bed and the adsorption bed, the concentration of mercury in the flue gas is 0.05μg / m 3 , direct emptying. The activity of the catalyst is affected by the fly ash and leads to a decrease. Every 4 months, an air compressor is used to inject air into the heat exchanger, and at the same time, the former flue gas with a temperature of 900 ° C passes through the heat exchanger to heat the above-mentioned cold air, and the temperature is 600 ℃, the regeneratio...

Embodiment 3

[0033] 10 kg of catalyst Pd1# loaded on a specific surface area of ​​1500m 2 / g, the weight is on the honeycomb activated carbon adsorbent of 120 kilograms, is made into Pd1# / activated carbon adsorbent, and its load capacity is 8.3%. The adsorption capacity of Pd1# / activated carbon to mercury oxide is 210mg / g. Put it into the catalytic bed, the catalytic bed is located behind the electrostatic precipitator (ESP) of the particle collection device, and the flue gas flow rate is 1000000m 3 / h, the mercury content is 10~20μg / m 3 change between. After passing through the catalytic / adsorption bed, the concentration of mercury in the flue gas is 0.2μg / m 3 , direct emptying. Every 2 months, the air compressor is used to pump air into the heat exchanger, and at the same time, the front flue gas with a temperature of 600°C is used to heat the above-mentioned cold air through the heat exchanger to obtain regeneration at a temperature of 250°C and a flow velocity of 8m / s Gas, the cat...

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Abstract

This invention relates to a catalytic oxidation smoke gas mercury removing method, which is used for controlling and reclaiming the gas mercury, especially for the brown coal and subbituminous coal smoke gas. The method uses the mercury oxidative catalyst and the adsorbent to oxygenize and absorb mercury in the smoke gas, then dissociate and elution the mercuric oxide in high temperature to regenerate it. The heat of the elution gas can be reclaimed by residual heat utilization device, and the high concentration mercury will be reclaimed through cold-trap or processed by the agent in the mercury reactor. The reclaimed mercury and other by-product can be sold to reduce the cost. Said invention uses the thermal instability of the mercuric oxide, and reclaims in the relative lower temperature; the recovery ratio can reach to 98%, meanwhile, it processes post-treatment with the mercury and has no secondary pollution.

Description

technical field [0001] The invention relates to a method for removing mercury from catalytic oxidation flue gas, which uses a catalyst capable of oxidizing mercury to treat and recover mercury in flue gas, and belongs to the technical field of environmental protection and energy saving. Background technique [0002] After investigation, the U.S. Environmental Protection Agency believes that coal-fired power plants are currently the largest source of mercury emissions that have not been controlled by humans. Considering the huge amount of mercury emissions from power plants and the accumulation of mercury in fish, it is considered necessary to control them. [0003] Oxidized mercury is easy to control and is not global, so the current mercury control technology mainly focuses on increasing the oxidation state ratio of mercury in flue gas, whether it is activated carbon adsorption injection (ACI), wet flue gas desulfurization (WFGD) method, low temperature Net electrostatic pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/64
Inventor 申哲民梅志坚程金平袁涛王文华
Owner SHANGHAI JIAO TONG UNIV
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