Method for synergically removing simple substance mercury and hydrogen sulfide from hot coal gas

A technology of hydrogen sulfide and elemental mercury, which is used in the purification of impurities by catalytic conversion of gas and the selection of absorbent solid gas. problem, to achieve the effect of high removal temperature, lower process cost and less equipment investment

Inactive Publication Date: 2011-10-26
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, due to the fact that modified activated carbon increases the cost of the adsorbent while improving the adsorption efficiency, and the adsorption product has low stability, low regeneration capacity, and may cause secondary pollution to the environment, it greatly limits the Wide application of modified activated carbon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Activated carbon comes from coal, the particle size is 30-60 mesh, and its pore volume is 0.46cm 3 / g, specific surface area 530m 2 / g.

[0026] (1) Activated carbon is installed in the fixed-bed reactor, and A coal gas is introduced, and its temperature is measured as 120°C;

[0027] (2) Before the A gas is passed into the fixed bed reactor, inject oxygen into the gas so that the oxygen content is 2000mg / m 3 ;

[0028] (3) gas at 1000h -1 After three hours of adsorption, the mercury removal rate in the gas at the outlet of the adsorber is 80.6%, and the hydrogen sulfide removal rate is 65.4%; the mercury content in the gas is 3.88μg / m 3 , the content of hydrogen sulfide is 865mg / m 3 .

Embodiment 2

[0030] Activated carbon comes from coconut shell with a particle size of 30-60 mesh and a pore volume of 0.50 cm 3 / g, specific surface area 580m 2 / g.

[0031] (1) Activated carbon is installed in the fixed-bed reactor, and A gas is introduced, and its temperature is measured as 150°C;

[0032] (2) Before A gas is passed into the fixed bed reactor, inject oxygen into the gas so that the oxygen content is 2500mg / m 3 ;

[0033] (3) gas at 3000h -1 The spatiotemporal index flows through the fixed bed reactor, and after two hours and thirty minutes of adsorption, the removal rate of mercury in the gas at the outlet of the adsorber is 72.1%, and the removal rate of hydrogen sulfide is 60.4%; the content of mercury in the gas is 5.58 μg / m 3 , the content of hydrogen sulfide is 990mg / m 3 .

Embodiment 3

[0035] Activated carbon comes from wood, the particle size is 30-60 mesh, and its pore volume is 0.45cm 3 / g, specific surface area 560m 2 / g.

[0036] (1) Activated carbon is installed in the fixed-bed reactor, and A coal gas is introduced, and its temperature is measured as 50°C;

[0037] (2) Before A gas is passed into the fixed bed reactor, inject oxygen into the gas so that the oxygen content is 3000mg / m 3 ;

[0038] (3) gas at 1500h -1The space velocity flows through the fixed-bed reactor, and after two hours and forty minutes of adsorption, the removal rate of mercury in the gas at the outlet of the adsorber is 77.8%, and the removal rate of hydrogen sulfide is 63.5%; the mercury content in the gas is 4.44μg / m 3 , the content of hydrogen sulfide is 912.5mg / m 3 .

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Abstract

The invention relates to a method for synergically removing simple substance mercury and hydrogen sulfide from hot coal gas, which comprises the following steps: charging oxygen into unpurified coal gas with 50-300 DEG C so that the weight of oxygen is 0.8-1.7 times of that of hydrogen sulfide in the coal gas; and introducing the coal gas into an adsorber filled with adsorbent at volume space velocity of 1000-3000h<-1>, and adsorbing for 2.5-3 hours. The invention has the advantages of low cost and no secondary pollution.

Description

technical field [0001] The invention belongs to a method for purifying coal gas, in particular to a method for synergistically removing elemental mercury and hydrogen sulfide in hot coal gas. technical background [0002] Mercury is a neurotoxin and a bioaccumulative substance that poses a great threat to human health. At present, it is believed that the sources of mercury environmental pollution are mainly natural releases and human factors. The main sources of man-made mercury pollution are coal utilization and waste incineration. In early 2003, a survey report issued by the United Nations Environment Program (UNEP) pointed out that the utilization of coal is the largest source of man-made mercury pollution. [0003] my country is a large coal-producing country in the world, with coal output accounting for 37% of the world's total. It is also a large coal-burning country, and its energy consumption is dominated by coal, which accounts for as much as 75% of its energy str...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10K1/34C10K1/32
Inventor 刘建涛张郃房倚天黄戒介程中虎张永奇
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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