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Soda wet desulphurization process and system for sintering flue gas

A technology for sintering flue gas and wet desulfurization, which is applied in separation methods, chemical instruments and methods, preparation of alkali metal sulfite, etc., and can solve problems such as lack of sintering desulfurization technology, large investment in desulfurization equipment, and complex by-product components , achieve the effect of shortening the reaction time, preventing oxidation and simple process

Inactive Publication Date: 2011-08-24
HUATIAN ENG & TECH CORP MCC
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems at present are: first, the lack of mature sintering desulfurization technology
Due to the complex composition of the by-products produced by sintering flue gas desulfurization, there is still a lack of effective utilization methods
Third, the desulfurization device has a large investment and high operating costs
Large investment and high operating cost are important factors restricting the installation of desulfurization devices

Method used

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  • Soda wet desulphurization process and system for sintering flue gas
  • Soda wet desulphurization process and system for sintering flue gas

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Embodiment Construction

[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0020] like figure 1 Shown, sodium-alkali desulfurization process of the present invention comprises the following steps:

[0021] ①The sulfur-containing flue gas enters the desulfurization tower 1 after dust removal and cooling;

[0022] ②In the desulfurization tower 1, the absorbent sodium carbonate solution (initial absorption) and sodium sulfite solution (final absorption) react, and the purified flue gas is discharged after demisting by the demister 2;

[0023] ③ Add caustic soda or soda ash solution to the sodium bisulfite solution obtained by absorption to react, so that all sodium bisulfite is converted into sodium sulfite; and heavy metals are removed at the same time.

[0024] ④ The sodium sulfite solution that removes impurities is evaporated and concentrated, heated to boiling with indirect steam, and the temperature is controlle...

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Abstract

The invention discloses a soda wet desulphurization process and a soda wet desulphurization system for sintering flue gas, and solves the problems of severe pollution and the like in the prior art. Sodium carbonate serves as a desulfurizing agent, and a desulfurization by-product is sodium sulfite; and the process comprises the following steps of: (1) cooling and introducing sulfur-containing flue gas into a desulfurizing tower; and (2) purifying the sulfur-containing flue gas in the step (1) in the desulfurizing tower by taking solution of sodium carbonate or sodium hydroxide as an absorbent, demisting the purified flue gas through a demister and discharging. The process is simple in procedures, high in desulphurization efficiency, high in response speed and high in value of the desulfurization by-product, and saves energy and land.

Description

technical field [0001] The invention relates to a wet desulfurization process for flue gas treatment in the industrial smelting industry, in particular to a wet desulfurization process for high-temperature flue gas generated in the production process of sintered pellets. Background technique [0002] At present, the flue gas composition of sintering (pellet) in my country's iron and steel industry is complex and highly volatile, with the following characteristics: first, the amount of flue gas is large, and the flue gas produced by one ton of sintering ore is 4000-6000m3; second, the concentration of sulfur dioxide varies greatly, The range is between 400-5000mg / Nm3; the third is that the temperature changes greatly, generally from 80 ° C to 180 ° C; 13%; six is ​​high oxygen content, generally 15 to 18%; seven is containing a variety of pollution components, in addition to containing sulfur dioxide and dust, but also contains heavy metals, dioxins, nitrogen oxides and so on. ...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/50C01D5/14
Inventor 张玉君杨春根
Owner HUATIAN ENG & TECH CORP MCC
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