Adjusting and control method for elemental sulfur byproduct of sulfate in desulfurization and denitrification absorption liquid of flue gas

A technology for desulfurization, denitrification, and liquid absorption, applied in the field of flue gas purification, can solve secondary pollution and other problems, achieve the effect of avoiding secondary pollution and obtaining economic benefits

Inactive Publication Date: 2019-07-30
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In their study, SO in flue gas 2 and NO in a bioreactor to complete the absorption and biotransformation process, the oxygen in the flue gas will affect the biotransformation process, and the SO 2 The conversion products produce sulfate, hydrogen sulfide, etc., resulting in secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A control method for the by-production of elemental sulfur from sulfate in the flue gas desulfurization and denitrification absorption liquid;

[0034] A 75t / h coal-fired thermoelectric boiler with a flue gas flow rate of 100,000 Nm 3 / h,SO 2 The content is 1000mg / Nm 3 , NO content is 300mg / Nm 3 , by washing with an alkaline solution containing Fe(II)EDTA, the desulfurization efficiency and denitrification efficiency are calculated according to 90%, SO 2 The conversion to sulfate is 1406.25mol / h, the production of Fe(II)EDTA-NO is 900mol / h, and the volume of absorption liquid used for purifying flue gas is 800m 3 After the absorption liquid purifies the flue gas for 10 hours, the molar concentration of sulfate in the absorption liquid is 17.58mM, and the molar concentration of Fe(II)EDTA-NO is 11.25mM. Since part of Fe(II)EDTA is oxidized by oxygen in the flue gas, the absorption liquid The molar concentration of Fe (III) EDTA in the iron is 7.5mM (accounting for 40...

Embodiment 2

[0040] A 220t / h coal-fired thermoelectric boiler with a flue gas flow rate of 250,000 Nm 3 / h, SO 2 The content is 1500mg / Nm 3 , NO content is 500mg / Nm 3 , by washing with an alkaline solution containing Fe(II)EDTA, the desulfurization efficiency and denitrification efficiency are calculated according to 95%, SO 2 The conversion to sulfate is 5566.40mol / h, the production of Fe(II)EDTA-NO is 3958.33mol / h, and the volume of absorption liquid used for purifying flue gas is 1800m 3 After the absorption liquid purifies the flue gas for 8 hours, the molar concentration of sulfate in the absorption liquid is 24.74mM, and the molar concentration of Fe(II)EDTA-NO is 17.59mM. Since part of Fe(II)EDTA is oxidized by oxygen in the flue gas, the absorption liquid The molar concentration of Fe (III) EDTA in the iron is 11.73mM (accounting for 40% of the total iron concentration in the absorption solution). will be 1800m 3 The absorption liquid is all discharged into the moving bed biof...

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Abstract

The invention belongs to the technical field of flue gas purification, and discloses an adjusting and control method for an elemental sulfur byproduct of sulfate in desulfurization and denitrificationabsorption liquid of flue gas. According to the method, the sulfate and Fe(II)EDTA-NO in the desulfurization and denitrification absorption liquid of the flue gas are used for adjusting the molar concentration of Fe(III)EDTA in the absorption liquid in the biological and chemical conversion process of the sulfate and the Fe(II)EDTA-NO, a sulphide generated from biological reduction of the sulfateis completely oxidized into the elemental sulfur, the Fe(III)EDTA is reduced into Fe(II)EDTA, and the Fe(II)EDTA can return to a flue gas desulfurization and denitrification system for recycling. Theprovided method can achieve that the sulfate in the desulfurization and denitrification absorption liquid of the flue gas is completely converted into the elemental sulfur, the added Fe(III)EDTA is reduced into the Fe(II)EDTA, and the added Fe(III)EDTA can be recycled. According to the method, the sulphur resource can be recovered, secondary pollution is avoided, the economic benefit is obtained,and the method is an ideal adjusting and control method of the desulphurization byproduct in a desulfurization and denitrification technology of the flue gas.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, and relates to a control method for the by-product elemental sulfur produced by sulfate in a flue gas desulfurization and denitrification absorption liquid. Background technique [0002] Combustion of fossil fuels can produce SO 2 Pollutants such as NO and NO may cause acid rain. NO can also cause photochemical smog and damage the ozone layer (Atmospheric Pollution Research, 2016, 7(1):66-74). At present, flue gas desulfurization and denitrification technology is widely used to control SO in flue gas. 2 and NO emissions. However, these techniques suffer from a number of deficiencies. Limestone-gypsum wet flue gas desulfurization technology has a series of disadvantages such as high energy consumption, large floor area, complex equipment, and large investment. The most widely used flue gas denitrification technology is Selective Catalytic Reduction (SCR) technology, urea or liqu...

Claims

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Application Information

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IPC IPC(8): B01D53/14
CPCB01D53/1425B01D2258/0283
Inventor 张玉孙利剑周集体
Owner DALIAN UNIV OF TECH
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