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Synchronous flue gas desulfurization and denitrification process combining chemical absorption with anaerobic-aerobic conversion

An anaerobic, aerobic, chemical absorption technology, applied in chemical instruments and methods, dispersed particle separation, separation methods, etc., can solve problems such as secondary pollution, and achieve low investment and operating costs, low energy consumption, and reasonable technology. Effect

Active Publication Date: 2015-05-13
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Many Chinese patents with application numbers 2013101265842, 2012100082464, 201110250192.8, 201310312882.0 and 201410524305.2 all add oxidants to the process of wet flue gas denitrification to remove nitrogen oxides in the flue gas, and the nitrogen oxides are oxidized by the oxidant to acid in the solution Salt, denitrification wastewater containing nitrate may cause secondary pollution if it is directly discharged, so the waste liquid generated by the oxidant wet flue gas denitrification process needs further treatment

Method used

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  • Synchronous flue gas desulfurization and denitrification process combining chemical absorption with anaerobic-aerobic conversion

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Embodiment 1

[0031] An 80t / h coal-fired thermal power boiler with a flue gas flow rate of 100,000 Nm 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 absorption tower, SO 2 The content is 50mg / Nm 3 , NO content is 100mg / Nm 3 ; The desulfurization efficiency is 95%, the denitration efficiency is 80%, the elemental sulfur recovery rate is 95%, and the recovered elemental sulfur is 1083kg / d.

[0032] SO 2 The absorption tower is a spray tower with a diameter of 3.5m, a height of 22m, and a liquid-gas ratio of 3L / Nm 3 , The desulfurization absorption liquid in the absorption process is composed of NaOH and the alkaline solution of the sulfur recovery system.

[0033] The NO absorption tower is a packed tower with a diameter of 8m, a height of 35m, and a liquid-gas ratio of 10L / Nm 3 , The denitrification absorption liquid in the absorption process is a mixture of NaClO...

Embodiment 2

[0038] A 200t / h coal-fired thermal electric boiler with a flue gas flow rate of 250,000 Nm 3 / h, SO 2 The content is 1000mg / Nm 3 , NO content is 500mg / Nm 3 , the flue gas temperature is 150°C, according to the process of the present invention, when leaving the 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 95%, and the recovered elemental sulfur is 2707kg / d.

[0039] SO 2 The absorption tower is a spray tower with a diameter of 5.6m, a height of 22m, and a liquid-gas ratio of 3L / Nm 3 , The desulfurization absorption liquid in the absorption process is composed of NaOH and the alkaline solution of the sulfur recovery system.

[0040] The NO absorption tower is a packed tower with a diameter of 13m, a height of 35m, and a liquid-gas ratio of 10L / Nm 3 , The denitrification absorption liquid in the absorption process is a mixture...

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Abstract

The invention discloses a synchronous flue gas desulfurization and denitrification process combining chemical absorption with anaerobic-aerobic conversion and belongs to the field of industrial flue gas control. A solution absorbing SO2 to generate sulfate and sulfite enters an anaerobic bioreactor, sulfate and sulfite are reduced into sulfide by utilizing sulfate reducing bacteria, and the sulfide-containing solution in the anaerobic bioreactor enters an aerobic bioreactor; a solution absorbing NOx to generate nitrate and nitrite enters the aerobic bioreactor, sulfide is converted into elemental sulfur by utilizing microorganisms, and nitrate and nitrite are converted into N2. An elemental sulfur-containing mixed solution generated by the aerobic bioreactor is treated with a sulfur recovery system to obtain relatively high-content sulfur for recycling, and an alkaline solution obtained by the sulfur recovery system returns to a desulfurization and denitrification absorption tower for circulation. The process is reasonable, low in energy consumption, low in investment operation expense and little in secondary pollution, synchronizes flue gas desulfurization and denitrification, recovers elemental sulfur, and is an ideal flue gas desulfurization and denitrification process.

Description

technical field [0001] The invention belongs to the field of industrial flue gas treatment and relates to a synchronous flue gas desulfurization and denitrification process combined with chemical absorption and anaerobic aerobic transformation. Background technique [0002] Sulfur dioxide (SO 2 ) and nitrogen oxides (NO x ), mainly from natural sources such as volcanic eruptions, lightning, and bacterial activities, and from man-made sources such as industry, transportation, and fossil fuel combustion, etc., NO x It can form photochemical smog with hydrocarbons, produce acid rain and acid fog, damage vegetation, endanger human health, and destroy the ozone layer at the same time. In view of this, it is very important to take certain measures to reduce or eliminate the emission of sulfur dioxide and nitrogen oxides in flue gas. [0003] The flue gas desulfurization and denitrification technology that is widely used in industry is the combination process of limestone-gypsum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/73B01D53/50B01D53/56B01D53/96
Inventor 张玉王晓伟孙超越张婷婷周集体
Owner DALIAN UNIV OF TECH
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