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Method for removing mercury from flue gas using sulphur-applying active carbon

A technology of sulfur activated carbon and activated carbon is applied in the field of mercury removal from flue gas, which can solve the problems of no proposed flue gas mercury removal technology, and achieve the effects of eliminating secondary pollution, high efficiency and reducing cost.

Inactive Publication Date: 2011-07-27
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above series of inventions and technologies only provide the preparation method of flue gas demercury sulfur-containing activated carbon with low cost and high adsorption characteristics, and no applicable flue gas demercuration technology has been proposed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for flue gas demercuration using sulfur-enriched activated carbon: firstly adopt the applicant’s application for “a mesoporous sulfur-endowed activated carbon for mercury removal and its preparation method” (CN 200810197620) and “coke-based modified carbon Preparatory material and sulfur-endowing activated carbon and its preparation method” (CN200810197619.0) The sulfur-endowing activated carbon prepared by the patented technology, that is, the carbon preparatory material prepared by using commercially available activated carbon or coke powder and sulfur-rich carbon resources dry distillate, has a temperature of 350-850 °C, with SO 2 The mixed gas or flue gas in the hot charcoal fixed bed undergoes hot charcoal reduction reaction to generate sulfur-endorsed activated carbon.

[0022] The particle size of the sulfur-endowing activated carbon powder prepared in this example is 25-212 μm, and the specific surface area of ​​the sulfur-endowing activated carbon is 1...

Embodiment 2

[0029] A method for flue gas demercuration using sulfur-endowing activated carbon: the preparation method of sulfur-endowing activated carbon is the same as in Example 1. The particle size of the prepared sulfur-endowing activated carbon powder is 25-212 μm; the specific surface area of ​​the sulfur-endowing activated carbon is 350-600 m 2 / g, the mesopore specific surface area ratio is 35-55%, and the sulfur content is 10-20%. The mercury concentration in the outlet flue gas reaches the mercury concentration in the inlet flue gas for the first time to reach the adsorption equilibrium, and the mercury equilibrium adsorption capacity is 8 ~12mg·g -1 . Mercury adsorption reaction rate is determined by the kinetic rate model described in Example 1, wherein, k is 0.0050~0.0100min -1 .

[0030] Using sulfur-endowing activated carbon powder as the adsorbent, the concentration of mercury in the upstream flue is 150-500μg / m 3 , the temperature is 25~50℃ and the flow rate is 700~15...

Embodiment 3

[0032] A method for flue gas demercuration using sulfur-endowing activated carbon: the preparation method of sulfur-endowing activated carbon is the same as in Example 1. The prepared sulfur-endowing activated carbon powder particle size is 25-212μm; the specific surface area of ​​sulfur-endowing activated carbon is 600-1000m 2 / g, the mesopore specific surface area ratio is 55-75%, and the sulfur content is 5-10%. The mercury concentration in the outlet flue gas reaches the mercury concentration in the inlet flue gas for the first time to reach the adsorption equilibrium, and the mercury equilibrium adsorption capacity is 10 ~15mg·g -1 Mercury adsorption reaction rate is determined by the kinetic rate model described in embodiment 1, wherein, k is 0.0080~0.1000min -1 .

[0033] Using sulfur-endowing activated carbon powder as the adsorbent, the mercury concentration in the upstream flue is 500-1000μg / m 3 , the temperature is 50~75℃ and the flow rate is 1000~1800m 3 .m -2...

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Abstract

The invention relates to a method for removing mercury in flue gas by adopting sulphur-coating active carbon. The technical scheme is as follows: the sulphur-coating active carbon prepared by the prior proprietary art is adopted: the specific surface area ranges from 150 <2> / g to 2000<2> / g, the specific surface area percentage of a middle hole ranges from 15 percent to 100 percent, the sulphur content ranges from 1 percent to 30 percent, the adsorption balance is achieved when the mercury concentration of outlet flue gas reaches the mercury concentration of inlet flue gas for the first time, and the balance adsorption amount ranges from 0.1 mg*g<-1>to 350mg*g<-1>. For inlet flue gas with the mercury concentration ranging from 25 micrograms / m<3> to 3000 micrograms / m<3>, the temperature ranging from 25 DEG C to 250 DEG C and the flow rate ranging from 500 m<3>.m<-2>.hr<-1> to 2000m<3>*m<-2>*hr<-1>, sulphur-coating active carbon powder is jetted in an upstream flue, a thin bed is formed on a downstream cloth bag dust collector, the thickness of a bed layer ranges from 3 mm to 20 mm, the pressure drop of the bed layer ranges from 10 mm to 50 mm H2O, and the reactor idle time of the thin bed is maintained between 0.006s and 0.048s; when the mercury concentration of the outlet flue gas reaches 20 percent of that of the inlet flue gas, the penetration can be carried out, and the timeof single thin bed ranges from 15 min to 720 min. The invention has the characteristics of high mercury removal efficiency and low cost.

Description

technical field [0001] The invention belongs to the technical field of mercury removal from flue gas. In particular, it relates to a method for removing mercury from flue gas by using sulfur-endowing activated carbon. technical background [0002] In the Clean Air Act (CAA, Clean Air Act) promulgated by the U.S. Department of Environment (EPA, Environment Protection Agency, US) in 1990, 188 substances were listed as toxic air pollutants. There are 37 kinds detected in the flue gas of the power plant, among which there are 11 kinds of trace metals, and mercury fin is the first [Chang R.; Owens.D.EPRI J.1994, July / August, 46]. Mercury pollution can cause serious damage to the environmental ecosystem, such as carcinogenesis, teratogenicity, mutagenesis, and tyrosinemia in humans; high-concentration mercury pollution will cause liver, lung, and kidney damage, chest pain, movement disorders, and Mental disorders, etc. Mercury pollution is mainly caused by human activities and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/04B01D53/64B01J20/20B01J20/30
Inventor 童仕唐吴晓琴
Owner WUHAN UNIV OF SCI & TECH