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Rapid calcium desulphurization method for flue gas

A technology of flue gas and calcium method, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles, etc. It can solve problems such as blockage and breakage of oxidation air pipes, high operating costs, and increased load on absorption towers.

Inactive Publication Date: 2012-06-06
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned limestone / gypsum method blows air into the slurry in the absorption tower. On the one hand, it increases the load of the absorption tower. On the other hand, the oxidation air pipe is often blocked and broken, which casts a shadow on the application of this method.
In addition, the by-product gypsum cannot reach the application grade, and is generally discarded as waste, and the high operating cost has become a restrictive factor.

Method used

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  • Rapid calcium desulphurization method for flue gas

Examples

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example 1

[0013] figure 1 Medium absorption tower 1, circulation pump 2, slurry pump 3, cyclone 4, filter press 5, limestone slurry tank 6, limestone slurry pump 7, washing water tank 8, washing water pump 9. Flue gas A, purified flue gas B, process water C, desulfurization residue (calcium sulfite) D, limestone (calcium carbonate) E

[0014] The flow rate is 200000Nm 3 / h, the flue gas A with a temperature of 150°C first enters the middle part of the desulfurization absorption tower 1, and contacts with the circulating liquid sprayed from the upper part. The concentration of potassium sulfate in the circulating liquid is 20% (mass fraction), and the slurry at the bottom of the tower passes through the slurry Pump 2 realizes circulation, and the circulating slurry volume is 480m 3 / h; after limestone E is made into 10% (mass fraction) slurry in limestone slurry tank 6, it is driven into the absorption tower with limestone slurry pump 7, and by spraying and washing, sulfur dioxide and ...

example 2

[0020] figure 1 Medium absorption tower 1, circulation pump 2, slurry pump 3, cyclone 4, filter press 5, carbide mud slurry tank 6, carbide mud slurry pump 7, washing water tank 8, washing water pump 9. Flue gas, purified flue gas B, process water C, desulfurization residue (calcium sulfite) D, calcium carbide mud (calcium hydroxide) E

[0021] The flow rate is 200000Nm 3 / h, the flue gas A with a temperature of 150°C first enters the middle part of the desulfurization absorption tower 1, and contacts with the circulating liquid sprayed from the upper part. The concentration of sodium sulfate in the circulating liquid is 20%, and the slurry at the bottom of the tower is circulated through the slurry pump 2 , the circulating slurry volume is 480m 3 / h; Calcium carbide mud E (solid content 50%) is made into 10% (mass fraction) slurry in the calcium carbide mud liquid tank 6 and is driven into the absorption tower with the calcium carbide mud liquid pump 7, by spray washing, in...

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Abstract

The invention provides a rapid calcium desulphurization method for flue gas. The invention is characterized in that: limestone (calcium carbonate) or calcium carbide sludge (calcium hydroxide) is used as an absorbent, sulfate is used as a process absorbent, flue gas enters into the middle part of an absorption tower, the flue gas and absorption liquid are in countercurrent contact with mass transfer, then the flue gas leaves from the top of the tower, most slurry at the bottom of the tower cycles in the absorption tower, a small part of the slurry is subjected to separation and dehydration, liquid phase process water returns to an absorption system and / or is used as calcium slurry, and solid phase process water is subjected to aftertreatment. The beneficial effects of the invention are as follows: the desulphurization absorption tower has an accelerated desulphurization speed and can treat more flue gas compared to a conventional absorbing tower with a same size; operation of the desulphurization absorption tower has the characteristics of great flexibility, stability and low energy consumption; greater comprehensive utilization space is retained in the procedure of aftertreatment which includes the operation of calcining for recovery of sulfur dioxide.

Description

technical field [0001] The invention belongs to the field of boiler tail gas treatment. The invention relates to a method for rapid calcium flue gas desulfurization. Background technique [0002] More than 90% of my country's energy structure uses coal as power, and burning coal will produce SO 2 , among which the power plant emissions are the largest, by SO 2 The acid rain pollution damage area mainly caused by acid rain has accounted for about 40% of the country's land area, and the economic loss caused by it has reached hundreds of billions of yuan every year in the country. [0003] At present, there are more than 100 methods of flue gas desulfurization in the world, and there are about 20 methods used in industry. Among them, the application of wet desulfurization technology accounts for about 85% of the entire industrialized desulfurization equipment, and the wet limestone / lime method accounts for about 80% of the wet method, which occupies a dominant position in to...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/50B01D53/96B01D47/06
Inventor 徐继红陶俊
Owner ANHUI UNIV OF SCI & TECH