Flue gas treatment method

A technology for flue gas treatment and flue gas, applied in gas treatment, separation methods, chemical instruments and methods, etc., can solve problems such as high nitrogen oxide content, poor flue gas denitration effect, and failure to meet national standards, etc., to achieve strong adsorption Good performance, good desulfurization and denitrification effect, good grinding effect

Active Publication Date: 2018-06-05
山东义丰环保机械股份有限公司
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  • Claims
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Problems solved by technology

In the technical solution disclosed in the above documents, the removal of nitrogen oxides in the flue gas needs to ensure that the temperature of the flue gas is above 200°C, and the required removal effect of nitrogen oxides has been achieved. Since the flue gas needs to be desulfurized before denitrification, after desulfurization The temperature of the flue gas is usually difficult to maintain above 200°C, which leads to poor denitrification effect of the flue gas, and the content of nitrogen oxides in the flue gas after treatment is high, which cannot meet the national standard

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0066] 1) Dedusting the flue gas of boiler 1;

[0067] The flue gas discharged from the boiler 1 first enters the dust collector 2 to remove the dust in the flue gas, so as to prevent the dust in the flue gas from hindering the mixing of the sodium bicarbonate powder and the flue gas, and affecting the mixing of the sodium bicarbonate powder and the flue gas. Nitrogen oxides and sulfur oxides react, which can also reduce the difficulty of subsequent dust reduction treatment;

[0068] 2) Extract part of the flue gas, dehumidify the extracted flue gas and send it into the sodium bicarbonate grinding device 7;

[0069] Part of the flue gas is drawn out of 5% of the flue gas volume through the auxiliary flue 5, and the drawn flue gas enters the dehumidification device, and the flue gas first enters the dehumidification chamber to exchange heat with the lower part of the heat exchanger 21, and then with the The cooler 22 exchanges heat and condenses to condense and liquefy the wat...

Embodiment 2

[0076] 1) Dedusting the flue gas of boiler 1;

[0077] The flue gas discharged from the boiler 1 first enters the dust collector 2 to remove the dust in the flue gas, so as to prevent the dust in the flue gas from hindering the mixing of the sodium bicarbonate powder and the flue gas, and affecting the mixing of the sodium bicarbonate powder and the flue gas. Nitrogen oxides and sulfur oxides react, which can also reduce the difficulty of subsequent dust reduction treatment;

[0078] 2) Extract part of the flue gas, dehumidify the extracted flue gas and send it into the sodium bicarbonate grinding device 7;

[0079] Part of the flue gas is drawn out of 3% of the flue gas volume through the auxiliary flue 5, and the drawn flue gas enters the dehumidification device, and the flue gas first enters the dehumidification chamber to exchange heat with the lower part of the heat exchanger 21, and then with the The cooler 22 exchanges heat and condenses to condense and liquefy the wat...

Embodiment 3

[0085] 1) Dedusting the flue gas of boiler 1;

[0086] The flue gas discharged from the boiler 1 first enters the dust collector 2 to remove the dust in the flue gas, so as to prevent the dust in the flue gas from hindering the mixing of the sodium bicarbonate powder and the flue gas, and affecting the mixing of the sodium bicarbonate powder and the flue gas. Nitrogen oxides and sulfur oxides react, which can also reduce the difficulty of subsequent dust reduction treatment;

[0087] 2) Extract part of the flue gas, dehumidify the extracted flue gas and send it into the sodium bicarbonate grinding device 7;

[0088] Through the secondary flue 5, part of the flue gas is drawn out of the flue gas with 7% of the flue gas volume, and the drawn flue gas enters the dehumidification device, and the flue gas enters the dehumidification chamber first to exchange heat with the lower part of the heat exchanger 21, and then with the The cooler 22 exchanges heat and condenses to condense ...

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Abstract

The invention provides a flue gas treatment method, and belongs to the technical field of environmental protection equipment. The flue gas treatment method comprises the following treatment steps that: discharged flue gas is dedusted by a deduster and then enters a main flue, and the flue gas accounting for 3-7% of the volume of the dedusted flue gas is drawn out and is cooled and dehumidified tohave a temperature of 60-80 DEG C and a relative humidity of less than 3.5%, and then the flue gas preheats sodium bicarbonate in a grinding device; the preheated sodium bicarbonate powder is heated to 120-200 DEG C and then sprayed directly into the main flue to have a chemical reaction with nitrogen oxides and sulfur oxides in the flue gas; and the flue gas is discharged after washing. The fluegas treatment method can well solve the problems of desulfurization and denitration of low-temperature flue gas, is low in energy consumption, low in equipment cost and wide in application range, andcan not only realize the treatment of low-temperature flue gas, but also can adapt to the treatment of high-temperature flue gas, and sodium bicarbonate powder is directly mixed with the flue gas, sothat compared with spraying a solution, the requirement on equipment is low, and the reaction efficiency is high.

Description

technical field [0001] A flue gas treatment method belongs to the technical field of environmental protection equipment. Background technique [0002] Modern environmental science warns us that atmospheric environmental resources are not endless, just like water resources and mineral resources, it is a wealth shared by human beings, which must be protected, highly cherished and rationally utilized. Smoke is a mixture of gas and smoke and is the main cause of air pollution in residential areas. The composition of the flue gas is very complex. The gas includes water vapor, sulfur dioxide, nitrogen, oxygen, carbon monoxide, carbon dioxide, hydrocarbons, and nitrogen oxides. The smoke includes fuel ash, coal particles, oil droplets, and pyrolysis products. Therefore, The pollution of flue gas to the environment is the compound pollution of various poisons. At present, the treatment of flue gas generally includes three parts: dust removal, desulfurization, and denitrification, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/83B01D53/60
CPCB01D53/60B01D53/83B01D2251/304B01D2251/606B01D2258/0283Y02A50/20
Inventor 魏向海赵肖飞车秀花刘延钊
Owner 山东义丰环保机械股份有限公司
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