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Method for desulfurization of flue gas in boiler by using red mud

The technology of boiler flue gas and red mud slurry is applied in the field of boiler flue gas desulfurization, which can solve the problems of complicated preparation process, large flue gas resistance and high manufacturing cost, and achieve the effects of simple preparation, saving operation cost and low cost.

Active Publication Date: 2013-04-10
安阳化学工业集团有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

3. The invention patent with the application number 201110157467.3 and titled "Preparation Method of Fly Ash Desulfurizer" discloses a method for preparing solid desulfurizer from fly ash. The preparation process is cumbersome and requires the use of Ca(OH ) 2 、Na 2 SiO 3 9H 2 Substances such as O and NaOH are expensive to manufacture, and Ca(OH) is mainly used for desulfurization. 2 and NaOH, and the use of solid desulfurizers causes problems such as large flue gas resistance and laborious replacement, which are difficult to apply in industry

Method used

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  • Method for desulfurization of flue gas in boiler by using red mud

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Experimental program
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Embodiment 1

[0040] The present invention utilizes red mud slurry to carry out the method for boiler flue gas desulfurization, and the detailed steps of this method are as follows:

[0041] a. Preparation of red mud slurry:

[0042] The red mud slurry is industrial waste red mud produced in the alumina industry, the red mud is introduced into the red mud slurry preparation tank 1, water is added and stirred evenly by the agitator 8, and a red mud slurry with a solid content of 7-10% is prepared;

[0043] The mass percentages of each chemical component in the red mud are SiO 2 13~20%, Al 2 o 3 18~28%, Fe 2 o 3 11~17%, TiO 2 3~5%, CaO 13~20%, MgO 1.5~2.4%, K 2 O 1.2~2.6%, Na 2 O 3~6%;

[0044] b. Inject the red mud slurry made in step a into the red mud pool 2. In order to prevent the separation of gray water, use the agitator 3 to continuously stir, and use the desulfurization circulating pump 4 to transport the red mud slurry in the red mud pool 2 to the desulfurization tower 7...

Embodiment 2

[0047] Embodiment 2: basically the same as Embodiment 1, the difference is:

[0048] In step a: add water and stir evenly through the agitator 8 to prepare a red mud slurry with a solid content of 10-15%;

[0049] Step b: In the boiler flue gas desulfurization process, the volume ratio between the flue gas produced by the boiler and the red mud slurry with a solid content of 10-15% is 1000:3, that is, 1000 cubic meters of flue gas need Pass 3 cubic meters of red mud slurry with a solid content of 10-15%.

Embodiment 3

[0050] Embodiment 3: basically the same as Embodiment 1, the difference is:

[0051] In step a: add water and stir evenly through the agitator 8 to prepare a red mud slurry with a solid content of 15-20%;

[0052] Step b: In the boiler flue gas desulfurization process, the volume ratio between the flue gas produced by the boiler and the red mud slurry with a solid content of 15-20% is 1000:2, that is, 1000 cubic meters of flue gas need Pass 2 cubic meters of red mud slurry with a solid content of 15-20%.

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Abstract

The invention discloses a method for desulfurization of flue gas in a boiler by using red mud. The red mud adopted by the method is the red mud which is prepared by adding water in pollutant waste residue-red mud discharged when aluminum oxide is extracted in the aluminum making industry. The method comprises the following steps: injecting the red mud into a red mud pool and continuously stirring the red mud; conveying the red mud to a desulfurization tower through a desulfurization circulating pump; carrying out desulfurization reaction on the red mud and the flue gas introduced to the middle lower part of the desulfurization tower; discharging desulfurized flue gas from the top of the desulfurization tower; discharging mud products containing sulfate generated by desulfurization from the bottom of the desulfurization tower; conveying the mud products containing sulfate discharged to a mud-water separation device; separating out the red mud and water after desulfurization; pumping separated clean water to a red mud preparation tank for recycling; and conveying separated desulfurized red mud. The flue gas generated by the boiler is desulfurated, so that the method is simple to operate and low in cost. Wastes are treated by wastes to the benefit of environmental protection, so that the method has remarkable economic and social benefits.

Description

technical field [0001] The invention relates to a method for desulfurizing boiler flue gas, in particular to a method for utilizing red mud slurry to desulfurize boiler flue gas. Background technique [0002] The basic principle of flue gas desulfurization is to absorb acidic sulfur dioxide with alkaline substances. At present, flue gas desulfurization technology can be divided into wet method, dry method and semi-dry method according to the state of desulfurization reactants and desulfurization products. Wet desulfurization technology mainly includes limestone-gypsum method, double alkali method, magnesium method, ammonia method, seawater method, etc.; dry desulfurization technology mainly includes circulating fluidized bed desulfurization technology, humidified ash circulating flue gas desulfurization technology, electron beam method etc.; the semi-dry method mainly includes the circulation suspension semi-dry method, spray drying, calcium spraying in the furnace / humidifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/80B01D53/50
Inventor 高恒刘宏建荆民哲王一鸣宋宪生李具才付文龙
Owner 安阳化学工业集团有限责任公司
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