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Desulfurization and denitration carbon base fuel fume mercury absorbent and use thereof

A carbon-based coal-burning, desulfurization and denitrification technology, which is applied in other chemical processes, dispersed particle separation, chemical instruments and methods, etc., can solve the problems of high cost and low adsorption efficiency, achieve enhanced adsorption capacity, reliable system operation, and enhanced The effect of shape transformation ability

Inactive Publication Date: 2012-01-04
SHANGHAI UNIVERSITY OF ELECTRIC POWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, conventional activated carbon and other carbon-based coal-fired flue gas mercury sorbent injections have high cost, low adsorption efficiency, and negative impact on the comprehensive utilization of coal-fired power plant boiler fly ash. Therefore, general coal-fired power plants cannot use conventional injection Activated carbon and other carbon-based flue gas mercury adsorbents for flue gas mercury emission control

Method used

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  • Desulfurization and denitration carbon base fuel fume mercury absorbent and use thereof
  • Desulfurization and denitration carbon base fuel fume mercury absorbent and use thereof
  • Desulfurization and denitration carbon base fuel fume mercury absorbent and use thereof

Examples

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Effect test

preparation example 1

[0022] Sodium chloride and sodium thiosulfate are made into a 0.05mol / l solution in a ratio of 1:10 as a solution of a modifying reagent, and the activated carbon is soaked for 1 hour, and then dried naturally to obtain a modified carbon-based soot gas mercury sorbent. The stoichiometric ratio of chemical modification reagent to activated carbon is 1:2000.

preparation example 2

[0024] Potassium chloride and sodium thiosulfate were made into a 0.15mol / l solution in a ratio of 1:5 as the solution of the modifying reagent, and the activated carbon was soaked for 2 hours, and then dried naturally to obtain a modified carbon-based soot gas mercury sorbent. The stoichiometric ratio of chemical modification reagent to activated carbon is 1:200.

[0025] The adsorbent prepared in Example 2 has been carried out to carry out the experimental test of flue gas mercury adsorption effect. In the No. 2 furnace of a power plant in Kentucky, U.S., burning bituminous coal, this boiler is a 79MW unit, single furnace, negative pressure operation, π Shaped arrangement, burning coal powder. The power plant was established earlier without denitrification and desulfurization devices. The structure of the power plant is as follows: furnace - economizer - air preheater - electrostatic precipitator - chimney. A 12-day test was carried out, including 2 days for the conditiona...

Embodiment 4

[0029] Furnace No. 1 of a power plant in North Carolina, the United States, burns sub-bituminous coal. The boiler is a 125MW unit with a single furnace, negative pressure operation, π-shaped arrangement, and burns pulverized coal. The power plant was established earlier without a denitrification device. At the beginning, there was no desulfurization device. Later, a WFGD (wet desulfurization device) was added in 2001. The structure of the power plant during the test is as follows: Furnace—coal economizer—air preheater—— Electrostatic Precipitator - Desulfurization Island (WFGD) - Stack. Due to the increasingly stringent emission standards for flue gas from coal-fired power plant boilers in the United States, except for NO x with SO x In addition to the emission standards, the emission of heavy metal mercury in the flue gas of coal-fired power plant boilers has also been paid more and more attention, and corresponding regulations have been formulated. According to the time nod...

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Abstract

The invention discloses a carbon-based coal-fired fume mercury adsorbent and an application method thereof which can carry out the desulfurization operation and the denitration operation simultaneously. The method mixes haloid salt and thiosulfate to prepare a solution which is used as chemical modifier so as to dip the active carbon, thus obtaining the modified carbon-based coal-fired fume mercury adsorbent. The adsorbent has the applications of mercury removal, desulfurization and denitration in boilers of coal-fired power plants simultaneously; the adsorbent is sprayed into the fume of the boiler of the coal-fired power plants at the temperature of 110-350 DEG C so as to mix with the fume; the stoichiometric ratio of the adsorbent sprayed into the fume and heavy metal mercury in the fume is 1-5:10<4>; and the proportion of the adsorbent and the fly ash in the fume is 1-5:10<4>. The adsorbent can oxidate the elemental mercury in the fume as divalent mercury, realizes the comprehensive control on the mercury and CO2 in the fume, generates no side effects on the use of the fly ash of the coal-fired power plant, and generates no secondary pollution.

Description

technical field [0001] The invention relates to a method for controlling the emission reduction of heavy metal mercury in coal-fired flue gas. The carbon-based adsorbent is modified by chemical substances, and then the modified adsorbent is sprayed into the flue gas of the tail flue of the boiler. The chemical substances The heavy metal mercury in the flue gas is oxidized to form divalent mercury that is easily removed by carbon-based adsorbent, and the adsorbent can also remove sulfur dioxide and nitrogen oxides in the flue gas. Background technique [0002] The coal-based energy pattern will not change for a long period of time in the future, and the emissions of sulfur oxides, nitrogen oxides, soot and trace elements produced by coal combustion are becoming increasingly serious, which has brought enormous pressure to environmental protection , and endanger human health. In order to adapt to more and more stringent emission restrictions, foreign countries have started res...

Claims

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Application Information

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IPC IPC(8): B01J20/20B01J20/32B01D53/06B01D53/64B01D53/60
Inventor 吴江潘卫国任建兴沈敏强何平王文欢杜玉颖金云
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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