Additive for limestone-gypsum wet flue gas desulfurization and denitration process

A technology of wet flue gas desulfurization and additives, applied in the field of flue gas purification, can solve the problems of high sulfur content in coal combustion, difficulty in coal purchase, poor coal quality, etc., and achieve the effect of stable chemical properties and no corrosion of equipment

Inactive Publication Date: 2013-01-02
SNTO TECH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, coal-fired power plants across the country are facing the dilemma of difficulty in purchasing coal, poor coal quality, especially high and fluctuating sulfur content in coal-fired coal. The desulfurization system is often operating under abnormal conditions, and the desulfurization efficiency is low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] An additive for desulfurization and denitrification agent, its composition and weight percent are: urea 8, ethylenediamine 10, ammonium phosphate 5, diammonium hydrogen phosphate 10, ammonium carbonate 15, ammonium hydrogen phosphate 10, triethanolamine 2, hexyl Diacid 5, humic acid 5, citric acid 3, benzoic acid 2, glutaric acid 5, succinic acid 2, oxalic acid 5, p-hydroxybenzoic acid 3, sodium humate 1, sodium citrate 4, hexyl Sodium diacid 3, sodium benzoate 2.

[0029] Flue gas SO at the inlet of the desulfurization system 2 Concentration 2100mg / Nm 3 ;NOx concentration 850mg / Nm 3 ; Liquid-gas ratio 10.1; Calcium-sulfur ratio 1.1. The additive concentration is 850mg / L, the desulfurization efficiency is increased by 11%, and the denitrification efficiency is 68%.

Embodiment 2

[0031] An additive for desulfurization and denitrification agent, its composition and weight percent are: urea 18, ethylenediamine 12, ammonium phosphate 6, diammonium hydrogen phosphate 2, ammonium carbonate 15, ammonium hydrogen phosphate 5, adipic acid 3, Humic acid 2, citric acid 7, benzoic acid 9, glutaric acid 4, succinic acid 5, sodium humate 4, sodium citrate 3, sodium adipate 5.

[0032] Flue gas SO at the inlet of the desulfurization system 2 Concentration 2200mg / Nm 3 ; NOx concentration 840mg / Nm 3 ; Liquid-gas ratio 9.9; Calcium-sulfur ratio 1.05. The additive concentration is 900mg / L, the desulfurization efficiency is increased by 14%, and the denitrification efficiency is 60%.

Embodiment 3

[0034]An additive for desulfurization and denitrification agent, its composition and weight percent are: ethylenediamine 6, ammonium phosphate 10, diammonium hydrogen phosphate 15, ammonium carbonate 18, ammonium hydrogen phosphate 7, humic acid 3, benzoic acid 10 , glutaric acid 11, succinic acid 4, oxalic acid 5, sodium citrate 5, sodium adipate 6.

[0035] Flue gas SO at the inlet of the desulfurization system 2 Concentration 2000mg / Nm 3 ;NOx concentration 850mg / Nm 3 ; Liquid-gas ratio 9.8; Calcium-sulfur ratio 1.03. The additive concentration is 800mg / L, the desulfurization efficiency is increased by 15%, and the denitrification efficiency is 65%.

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Abstract

The invention provides an additive for limestone-gypsum wet flue gas desulfurization and denitration process, which belongs to the flue gas treatment field. The additive comprises amines 40-60 wt.%, organic acids 30-45 wt.%, and polymeric organic carboxylate 10-30 wt.%. The amines can directly react with sulfur dioxide acidic gas to form ammonium sulfite, thus realizing desulfurization. The amines can react with nitrogen oxides to form nitrogen gas, thus realizing denitration. The organic acids and polymeric organic carboxylate can promote the dissolution of limestone for reducing the usage amount of limestone, promote pH buffering capability of limestone slurry, prevent rapid pH decrease during the absorption of sulfur dioxide, inhibit formation of calcium sulfite soft scale, and prevent plugging of demister. Compared with the existing limestone method, this invention has increased desulfurization efficiency (by 5-10%) and increased denitration efficiency (by above 50%) under the same liquid-gas ratio condition.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, and in particular relates to an additive used in limestone-gypsum wet flue gas desulfurization and denitrification. Background technique [0002] Air pollution control has become the theme of environmental governance in today's era, and the main indicator of atmospheric substances is carbon dioxide (SO 2 ) and nitrogen oxides (NO x ). The Ministry of Environmental Protection and the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China jointly issued the "Emission Standards of Air Pollutants for Thermal Power Plants" which will be implemented on January 1, 2012. SO 2 Emission limit implementation 200mg / Nm 3 , NO x Emission limit implementation 100mg / Nm 3 . Stricter than the existing GB13223-2003 emission limits, especially for NO x emissions will be used as mandatory indicators. [0003] At present, the methods of simulta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/60B01D53/78
CPCY02A50/20
Inventor 李启云彭飞
Owner SNTO TECH GRP
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