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A wet flue gas desulfurization method

A technology of wet flue gas desulfurization and alkali method, which is applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of high operating costs, achieve low operating costs, high economic and environmental benefits, and good desulfurization effects Effect

Active Publication Date: 2018-08-28
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The milk of lime prepared with water and lime is used as flue gas desulfurization agent, and the operating cost is high; when limestone is used as wet flue gas desulfurization agent, it is usually necessary to grind limestone into a fine powder of 200-300 mesh in advance to ensure flue gas desulfurization Effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] SiO in fly ash alkaline pre-desilication lye 2 The content is 20g / L, the caustic alkali concentration is 80g / L, and the amount of lime added is based on CaO / SiO 2 Added at 1.0, stirred and reacted at a temperature of 90°C for 60 minutes, then filtered and washed, the obtained active calcium silicate had a water content of 75%, and a sodium oxide content of 1.2%; the active calcium silicate was prepared by adding water Form a desulfurizing agent suspension slurry with a liquid-solid ratio of 4.0; pump the desulfurizing agent suspension slurry to a spray-type flue gas desulfurization tower for circulating spray desulfurization, and the SO in the flue gas 2 The content is 2000mg / Nm 3 , the flue gas temperature is 70°C, and the liquid-gas ratio is 7.0L / m 3 , The flue gas desulfurization rate exceeds 97%.

Embodiment 2

[0024] Low-grade bauxite with an aluminum-silicon ratio of 3.0 is subjected to roasting and pre-desilication treatment, and the SiO in the pre-desilication lye obtained 2 The content is 30g / L, the caustic alkali concentration is 100g / L, and the amount of lime added is based on CaO / SiO 2 Added at 1.30, stirred and reacted for 60 minutes at a temperature of 90°C, then filtered and washed, the water content of the obtained active calcium silicate was 65%, and the content of sodium oxide was 2.5%; the active calcium silicate was prepared by adding water Form a desulfurizing agent suspension slurry with a liquid-solid ratio of 13; pump the desulfurizing agent suspension slurry to a spray-type flue gas desulfurization tower for circulating spray desulfurization, and the SO in the flue gas 2 The content is 800mg / Nm 3 , the flue gas temperature is 75°C, and the liquid-gas ratio is 13L / m 3 , The flue gas desulfurization rate exceeds 98%.

Embodiment 3

[0026] Low-grade bauxite with an aluminum-silicon ratio of 3.5 is roasted and pre-desiliconized, and the SiO in the pre-desiliconized alkali solution 2 The content is 40g / L, the caustic alkali concentration is 150g / L, and the amount of lime added is based on CaO / SiO 2 1.10 was added, stirred and reacted for 60 minutes at a temperature of 90°C, and then filtered and washed. The obtained active calcium silicate had a water content of 65% and a sodium oxide content of 1.1%; the active calcium silicate was prepared by adding water. Form a desulfurizing agent suspension slurry with a liquid-solid ratio of 5.0; pump the desulfurizing agent suspension slurry to a spray-type flue gas desulfurization tower for circulating spray desulfurization, and the SO in the flue gas 2 The content is 1200mg / Nm 3 , the flue gas temperature is 65°C, and the liquid-gas ratio is 10L / m 3 , The flue gas desulfurization rate exceeds 98%.

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PUM

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Abstract

The invention relates to a wet flue gas desulfurization method, and relates to a wet flue gas desulfurization method by using active calcium silicate as a desulfurization agent. The wet flue gas desulfurization method is characterized in that in the desulfurization process, alkaline liquid containing sodium silicate generated in pre-desilicication treatment during aluminum oxide production by using an alkaline process is adopted as a low-aluminum raw material, and lime is added to prepare active calcium silicate to serve as the wet flue gas desulfurization agent. The wet flue gas desulfurization method has the advantages of high desulfurization reaction speed, high desulfurization efficiency and low operation cost. The active calcium silicate serves as the wet flue gas desulfurization agent, and control requirement for the content of sodium oxide in active calcium silicate is widened properly, so that the washing water amount can be reduced, and a drying dewatering process with high energy consumption is not needed, therefore, the wet flue gas desulfurization method has good economical benefit and environmental benefit.

Description

technical field [0001] A wet flue gas desulfurization method relates to a wet flue gas desulfurization method using active calcium silicate as a desulfurizing agent. Background technique [0002] Sulfur dioxide in the flue gas of coal-fired boilers is one of the main air pollutants. Limestone / lime wet flue gas desulfurization technology is the most mature flue gas desulfurization technology, which has high flue gas desulfurization efficiency, reliable operation, and strong applicability. advantage. Milk of lime prepared with water and lime is used as flue gas desulfurization agent, and the operating cost is high; when limestone is used as wet flue gas desulfurization agent, it is usually necessary to grind limestone into a fine powder of 200-300 mesh in advance to ensure flue gas desulfurization Effect. [0003] In the alkaline pre-desilication process of low-aluminum raw materials such as fly ash and low-grade bauxite, a large amount of active calcium silicate is often pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/80B01D53/50
CPCB01D53/502B01D53/80B01D2251/404B01D2257/302
Inventor 尹中林武国宝齐利娟
Owner GUIZHOU BRANCH CHINA ALUMINUM IND