Chemical absorption and microbial fuel cell combined synchronous flue gas desulfurization and denitration technology

A fuel cell and chemical absorption technology, which is applied in the fields of nitrous oxide capture, chemical instruments and methods, sulfur preparation/purification, etc. It can solve the problems of large investment in combined process equipment, difficulty in the application of secondary pollution, and high operating costs.

Active Publication Date: 2015-11-11
DALIAN UNIV OF TECH
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Problems solved by technology

[0003] The flue gas desulfurization and denitrification technology that is widely used in industry is the combination process of limestone-gypsum wet desulfurization and selective catalytic reduction (SCR) denitrification, but the combined process equipment has large investment, high operating cost, and secondary pollution. Its application in flue gas desulfurization and denitrification is more difficult

Method used

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  • Chemical absorption and microbial fuel cell combined synchronous flue gas desulfurization and denitration technology

Examples

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Effect test

Embodiment 1

[0029] A 20t / h coal-fired hot water boiler with a flue gas flow rate of 50,000m 3 / h,SO 2 The content is 1000mg / Nm 3 , NO content is 500mg / Nm 3 , the flue gas temperature is 130°C, according to the process of the present invention, when leaving the desulfurization and denitrification absorption tower, SO 2 The content is 50mg / Nm 3 , NO content is 100mg / Nm 3 ; The desulfurization efficiency is 95%, the denitrification efficiency is 80%, the elemental sulfur recovery rate is 90%, and the recovered elemental sulfur is 324kg / d.

[0030] SO 2 The absorption tower is a spray tower with a diameter of 2m, a height of 12m, and a liquid-gas ratio of 2L / Nm 3 , The desulfurization absorption liquid in the absorption process is composed of NaOH and the alkaline solution of the sulfur recovery system.

[0031] The NO absorption tower is a packed tower with a diameter of 5m, a height of 22m, and a liquid-gas ratio of 10L / Nm 3 In the absorption process, the denitrification absorption ...

Embodiment 2

[0035] A 40t / h coal-fired hot water boiler with a flue gas flow rate of 95,000m 3 / h,SO 2 The content is 1000mg / Nm 3 , NO content is 500mg / Nm 3 , the flue gas temperature is 130°C, according to the process of the present invention, when leaving the desulfurization and denitrification absorption tower, SO 2 The content is 50mg / Nm 3 , NO content is 100mg / Nm 3 ; The desulfurization efficiency is 95%, the denitrification efficiency is 80%, the elemental sulfur recovery rate is 90%, and the recovered elemental sulfur is 615.6kg / d.

[0036] SO 2 The absorption tower is a spray tower with a diameter of 3m, a height of 14m, and a liquid-gas ratio of 2L / Nm 3 , The desulfurization absorption liquid in the absorption process is composed of NaOH and the alkaline solution of the sulfur recovery system.

[0037] The NO absorption tower is a packed tower with a diameter of 7m, a height of 23m, and a liquid-gas ratio of 10L / Nm 3 In the absorption process, the denitrification absorptio...

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Abstract

The invention provides a chemical absorption and microbial fuel cell combined synchronous flue gas desulfurization and denitration technology, and belongs to the field of industrial flue gas treatment. According to the characteristics of a microbial fuel cell, the regeneration regularity of a complexing agent in the complexing absorption-biological reduction denitration process and conversion of sulfate in the biological flue gas desulfurization process, SO2 and NOx in flue gas are sequentially absorbed by an alkaline solution and a Fe(II) solution, then desulfurization and denitrification washing solutions enter an anode chamber and a cathode chamber of a built double-chamber MFC respectively, desulfuration is achieved to generate sulfate bioconversion and generate elemental sulfur in the anode chamber, electrons generated by an anode are fed into a cathode through an external circuit, and biological reduction of Fe(II)-NO and Fe(III) generated by complexing denitration and regeneration of Fe(II) are achieved in the cathode chamber. The washing agents absorbing SO2 and NOx in flue gas synchronously achieve biological sulfate reduction, biological sulfide oxidation to generate elemental sulfur and biological regeneration of a complexing denitrification solution through an MFC system.

Description

technical field [0001] The invention belongs to the field of industrial flue gas treatment, and relates to a new process of chemical absorption combined with microbial fuel cell synchronous flue gas desulfurization and denitrification. Background technique [0002] Combustion of fossil fuels such as coal and oil produces a large amount of sulfur dioxide (SO 2 ) and nitrogen oxides (NO x ), while SO 2 and NO x As a major air pollutant, it has had a significant impact on human health and the natural environment. To reduce SO in the atmosphere 2 and NO x To control its huge impact on the environment, people have developed various flue gas desulfurization and denitrification processes. [0003] The flue gas desulfurization and denitrification technology that is widely used in industry is the combination process of limestone-gypsum wet desulfurization and selective catalytic reduction (SCR) denitrification, but the combined process equipment has large investment, high opera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/50B01D53/56C01B17/02
CPCY02C20/10
Inventor 张玉孙继宸孙超越王晓伟谢柄柯万方周集体
Owner DALIAN UNIV OF TECH
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