Preparation method of wet desulphurization absorbent for flue gas from coal fired boiler

A technology for coal-fired boilers and wet desulfurization, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles. It can solve the problems of high operating costs, large power consumption, and large investment, so as to reduce operating costs and extend service life. Longevity, cheap effect

Inactive Publication Date: 2012-06-13
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the wet flue gas desulfurization technology developed in the world can be divided into limestone washing method, double alkali method, Wellman-Lord method, magnesium oxide method and ammonia method according to the material composition of the desulfurization absorbent. Each flue gas desulfurization technology has its own advantages and disadvantages, but there are also problems such as scaling, corrosion, huge investment, large power consumption, and high operating costs to varying degrees.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Through the test, the SO in the flue gas of large coal-fired power plant boilers 2 The concentration is 1000mg / m 3 , the flue gas flow rate is 38×10 4 m 3 / h. Select fly ash after burning low-sulfur coal, select limestone powder, and sieve fly ash and limestone powder respectively, so that the particle size of fly ash and limestone powder is less than 80 microns, and the composition of limestone powder is loss on ignition 40.79 %, silicon 4.62%, aluminum 1.21%, iron 0.52%, calcium 50.16%. According to SO in flue gas of coal-fired boiler 2 The concentration of the limestone powder is weighed according to the calcium-sulfur molar ratio of 0.7 to remove 1000mg of SO 2 , requires 0.9g of limestone powder. According to the mass ratio of fly ash to limestone powder is 1, 0.9g of fly ash after combustion of low-sulfur coal is selected. At the same time, according to the liquid-gas mass / volume ratio of 101g / m 3 The proportion of the selected 10lg of 20 ℃ ~ 30 ℃ of water...

Embodiment 2

[0023] Through the test, the SO in the flue gas of large coal-fired power plant boilers 2 The concentration is 2000mg / m 3 , the flue gas flow rate is 80×10 4 m 3 / h. Select fly ash after burning low-sulfur coal, select limestone powder, and sieve fly ash and limestone powder respectively, so that the particle size of fly ash and limestone powder is less than 80 microns, and the composition of limestone powder is loss on ignition 40.79 %, silicon 4.62%, aluminum 1.21%, iron 0.52%, calcium 50.16%. According to SO in flue gas of coal-fired boiler 2 The concentration of the limestone powder is weighed according to the calcium-sulfur molar ratio of 0.9 to remove 2000mg of SO 2 , requires 2.2g of limestone powder. According to the mass ratio of fly ash to limestone powder of 0.8, 1.8g of fly ash after burning low-sulfur coal is selected. At the same time, according to the liquid-gas mass / volume ratio of 13lg / m 3 The proportion of the selected 13lg of 20 ℃ ~ 30 ℃ of water. A...

Embodiment 3

[0025] Through the test, the SO in the flue gas of large coal-fired power plant boilers 2 The concentration is 3000mg / m 3 , the flue gas flow rate is 130×10 4 m 3 / h. Select fly ash after burning low-sulfur coal, select limestone powder, and sieve fly ash and limestone powder respectively, so that the particle size of fly ash and limestone powder is less than 80 microns, and the composition of limestone powder is loss on ignition 40.79 %, silicon 4.62%, aluminum 1.21%, iron 0.52%, calcium 50.16%. According to SO in flue gas of coal-fired boiler 2 Concentration, according to the ratio of calcium sulfur molar ratio of 1.1 to take limestone powder, remove 3000mg of SO 2 , need 4.1g of limestone powder. According to the ratio of fly ash to limestone powder mass ratio of 0.6, select 2.5g of fly ash after combustion of low-sulfur coal. At the same time, according to the liquid-gas mass / volume ratio of 16lg / m 3The proportion of the selected 16lg of 20 ℃ ~ 30 ℃ of water. Acco...

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Abstract

The invention discloses a preparation method of a wet desulphurization absorbent for flue gas from a coal fired boiler. The method comprises the following steps: (1) selecting fly ash from combustion of low sulfur coal, selecting limestone powder and screening the fly ash and limestone powder respectively; (2) weighing the limestone powder according to a calcium sulfur molar ratio of 0.7-1.1; (3) weighing fly ash according to a mass ratio of fly ash to limestone being 0.5-1; (4) determining weight of water in the desulphurization absorbent, according to a volume flow of the flue gas from the coal fired boiler and a weight to volume ratio of liquid to gas being 101-161 g / m<3>; (5) adding fly ash into water, stirring uniformly and carrying out hydration treatment; and (6) adding limestone powder into the fly ash slurry treated with hydration treatment and stirring uniformly to obtain the desulphurization absorbent. The desulphurization absorbent can effectively increase desulphurization efficiency of a wet method flue gas desulphurization system and substantially reduce operating cost of the system.

Description

technical field [0001] The invention relates to the field of flue gas desulfurization, in particular to a method for preparing a wet desulfurization absorbent for coal-fired boiler flue gas. The desulfurization absorbent is suitable for flue gas desulfurization of large coal-fired power plant boilers. Background technique [0002] Soot-type air pollution is the main form of air pollution in my country where coal is the main energy source. The main pollutant of soot-type air pollution is SO 2 , currently, by SO 2 The air pollution caused has become an important factor restricting the sustainable development of my country's national economy and society. 2 The emission of air pollution has become the most urgent task in the field of air pollution control in my country. [0003] Wet flue gas desulfurization technology uses liquid desulfurization absorbent to desulfurize SO in flue gas 2 For chemical absorption technology, the entire desulfurization system is located at the b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/50
Inventor 曾庭华董芃陈磊翟明张玉
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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