Wet desulfurization and denitration synergist for coal fired boiler

A technology for wet desulfurization and coal-fired boilers, which is applied in separation methods, chemical instruments and methods, and dispersed particle separation, etc., can solve the problems of decreased denitration effect, large fluctuations, and difficulty in purchasing coal.

Inactive Publication Date: 2017-01-04
王立群 +1
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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 difficulties in purchasing coal, poor coal quality, especially high and fluctuating coal-fired sulfur content, desulfurization systems are often operating under abnormal conditions, and desulfurization efficiency is low
The denitrification process mostly adopts high-temperature selective and non-s...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A wet-process desulfurization and denitrification synergist for coal-fired boilers comprises the following components and weight percentages: 10 cobalt oxide, 30 magnesium sulfate, 50 adipic acid, 7 citric acid, and 7 cupric chloride dihydrate. Stir and mix evenly.

[0013] Flue gas SO at the inlet of the desulfurization system 2 Concentration 2500mg / Nm 3 ; NOx concentration 740mg / Nm 3 ; Liquid-gas ratio 10.0; Calcium-sulfur ratio 1.05. The additive concentration is 1000mg / l, the desulfurization efficiency is increased by 12%, and the denitrification efficiency is 55%.

Embodiment 2

[0015] A wet-process desulfurization and denitrification synergist for coal-fired boilers, the composition and weight percent of which are: 30 potassium permanganate, 6 cobalt oxide, 30 adipic acid, 30 copper nitrate, and 4 humic acid. Stir and mix evenly.

[0016] Flue gas SO at the inlet of the desulfurization system 2 Concentration 2500mg / Nm 3 ; NOx concentration 780mg / Nm 3 ; Liquid-gas ratio 9.8; Calcium-sulfur ratio 1.05. The additive concentration is 900mg / l, the desulfurization efficiency is increased by 12%, and the denitrification efficiency is 65%.

Embodiment 3

[0018] A wet-process desulfurization and denitrification synergist for coal-fired boilers, its components and weight percentages are: sodium chlorite 40, cobalt oxide 1 ammonium phosphate 10, sodium acetate 10, sodium humate 10, sodium citrate 10. Copper carbonate 10 and cobalt oxide 9 are stirred and mixed evenly.

[0019] Flue gas SO at the inlet of the desulfurization system 2 Concentration 3500mg / Nm 3 ;NOx concentration 800mg / Nm 3 ; Liquid-gas ratio 10.5; Calcium-sulfur ratio 1.05. The additive concentration is 1000mg / l, the desulfurization efficiency is increased by 12%, and the denitrification efficiency is 61%.

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Abstract

The present invention discloses a wet desulfurization and denitration synergist for a coal fired boiler. The wet desulfurization and denitration synergist is characterized by comprising by weight: 20-40% of an oxidation accelerator-like substance, 20-40% of an organic acid substance, and 10-30% of a synergist substance. According to the present invention, with the wet desulfurization and denitration synergist, the desulfurization efficiency of the absorption tower can be increased, the wet desulfurization and denitration synergist can be suitable for high-sulfur coal, and the concentration on the SO2 outlet achieves the standard; the capacity of catalytic oxidation of NO into water-soluble NO2 is enhanced so as to increase the removal of nitrogen oxides; the slurry circulation pump can be stopped to different degrees so as to achieve the energy saving purpose; the synergist has effects of promotion of the limestone dissolution, improvement of the pH value buffering capacity of the limestone slurry, inhibition of the calcium sulfite soft scale formation, prevention of the mist eliminator clogging, and increasing of the desulfuration gypsum purity; and under the same liquid-gas ratio condition, the desulfurization efficiency is increased by 5-10% and the denitration efficiency achieves 30-50% so as to simultaneous achieve the effects of desulfurization-denitrification and flue gas purifying.

Description

technical field [0001] The invention belongs to the technical field of flue gas treatment and control, in particular to a limestone-gypsum wet flue gas desulfurization and denitrification synergist for coal-fired boilers. 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 "Pollutant Emission Standards for Thermal Power Plants" which will be implemented on January 1, 2012. It clearly stipulates that from January 1, 2014, the SO 2 Emission limit implementation 200mg / Nm 3 , NO X Execution of emission limits, 100mg / Nm 3 Stricter emission limits than the existing GB13223-2003 regulations, especially for NO X Emissions will be used as m...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/60
CPCY02A50/20
Inventor 王立群高沛
Owner 王立群
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