Simultaneous desulfurization and denitrification method for flue gas

A technology for desulfurization, denitrification, and flue gas, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles, can solve the problems of high energy consumption and high ozone consumption, and achieve low operating costs, simple processes, and reduced processing costs. Effect

Inactive Publication Date: 2014-08-13
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The technical problem to be solved by the present invention is to overcome the technical defects of high ozone consumption and high energy consumption in the simultaneous desulfurization and denitrification process of flue gas in the prior art, and to provide a method for desulfurization and denitrification of flue gas

Method used

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  • Simultaneous desulfurization and denitrification method for flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Flue gas intake condition after dust removal: 4000Nm 3 / h,SO 2 The concentration is 1350ppm, the NO concentration is 600ppm, the temperature is 150°C, and the oxygen content in the flue gas is 7.5%.

[0051] The amount of ozone added: 2.6kg / h (0.5 times the molar amount of NO);

[0052] Absorbing liquid: industrial ammonia water (wherein the mass fraction of ammonia is 20%)+tap water;

[0053] Desulfurization and denitrification tower: spray tower;

[0054] Fe 3+ : Commercially available ferric sulfate, Fe in the prepared absorption solution 3+ The concentration is 8000ppm.

[0055] Desulfurization and denitrification devices such as figure 1 As shown, 1-intake flue, 2-ozone generator, 3-desulfurization and denitrification tower, 4-outlet flue, 5-absorption liquid circulation pump.

[0056] The flue gas is dedusted in the dust collector, the ozone is prepared in the ozone generator 2, the ozone is mixed with the flue gas in the intake flue 1, and reacted (pre-oxi...

Embodiment 2

[0062] Flue gas inlet conditions after dust removal: 12000Nm3 / h, SO 2 The concentration is 1000ppm, the NO concentration is 420ppm, the temperature is 120°C, and the oxygen content in the flue gas is 9.6%.

[0063] The amount of ozone added: 7.0kg / h (0.6 times the molar amount of NO);

[0064] Absorbing liquid: ammonium sulfite solution (wherein the mass fraction of ammonium sulfite is 20%)+tap water;

[0065] Desulfurization and denitrification tower: plate corrugated structured packing tower;

[0066] Fe 3+ : Commercially available ferric chloride, Fe in the prepared absorption solution 3+ The concentration is 45000ppm.

[0067] Flue gas dust removal, ozone is prepared in the ozone generator, ozone is mixed with flue gas in the intake flue, after the reaction (pre-oxidation), the mixed gas enters the desulfurization and denitrification tower from the bottom of the desulfurization and denitrification tower, and the absorption liquid comes from the desulfurization and deni...

Embodiment 3

[0070] Flue gas intake condition after dust removal: 7000Nm 3 / h,SO 2 The concentration is 730ppm, the NO concentration is 270ppm, the temperature is 110°C, and the oxygen content in the flue gas is 8.0%.

[0071] The amount of ozone added: 1.4kg / h (0.3 times the molar amount of NO);

[0072] Absorbing liquid: ammonium carbonate solution (wherein the mass fraction of ammonium carbonate is 40%)+tap water;

[0073] Desulfurization and denitrification tower: spray tower;

[0074] Fe 3+: Commercially available ferric sulfate, Fe in the prepared absorption solution 3+ The concentration is 30000ppm.

[0075] Flue gas dust removal, ozone is prepared in the ozone generator, ozone is mixed with flue gas in the intake flue, after the reaction (pre-oxidation), the mixed gas enters the desulfurization and denitrification tower from the bottom of the desulfurization and denitrification tower, and the absorption liquid comes from the desulfurization and denitrification tower. It is sp...

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Abstract

The invention discloses a simultaneous desulfurization and denitrification method for flue gas. The method comprises the following steps: (1) evenly mixing flue gas with O3 to obtain a mixed gas, wherein the mole ratio of O3 to NO<x> in the flue gas is (0.3-0.6) to 1; and (2) contacting the mixed gas with an absorbing liquid, wherein the absorbing liquid comprises ammonia and/or ammonium, as well as Fe<3+>; the content of Fe<3+> in the absorbing liquid is 1000ppm above; the content of ammonia and/or ammonium in the absorbing liquid is more than 0.1% in percentage by mass. According to the method, sulfur and nitre in the flue gas can be simultaneously removed, ozone consumption quantity is 0.3-0.6 of molar weight of NO<x> in the flue gas, the desulfurization rate can achieve more than 95%, the denitrification rate can achieve more than 80%, and mostly achieves more than 90%; the desulfurization and denitrification effects are stable, and the resource recycling of a product can be realized.

Description

technical field [0001] The invention relates to a method for simultaneous desulfurization and denitrification of flue gas. Background technique [0002] my country is the largest coal producer and consumer in the world, and its coal output accounts for about 25% of the world's total. More than 80% of the coal is used for direct combustion, and coal combustion will produce SO 2 , NO x Harmful gases, such as acid rain, greenhouse effect and ozone layer destruction, have caused a series of air pollution, seriously affecting the living environment of human beings. According to the 2012 China Environmental Bulletin, in 2012 my country's SO 2 The total emission was 21.176 million tons, and the total emission of nitrogen compounds was 23.378 million tons. Among the 466 cities (counties) monitored, 215 cities (counties) experienced acid rain, accounting for 46.1% of the total; 133 cities (counties) had acid rain frequency above 25%, accounting for 28.5%; There are 56 cities (cou...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/76B01D53/78B01D53/56B01D53/50
Inventor 郭少鹏吕丽娜仝明陈昕亢万忠周彦波鲁军
Owner EAST CHINA UNIV OF SCI & TECH
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