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Desulfurizer for desulfurization of smoke and method for preparing same

A desulfurizer, flue gas technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problems of low utilization rate of calcium-based absorbent and low desulfurization rate

Active Publication Date: 2011-07-27
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of low desulfurization rate and low utilization rate of calcium-based absorbents in the existing semi-dry and dry flue gas desulfurization processes, thereby providing a desulfurization system capable of efficient desulfurization and efficient utilization of calcium-based absorbents agent

Method used

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  • Desulfurizer for desulfurization of smoke and method for preparing same

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Take the blast furnace slag (by weight, which includes: SiO 2 : 25wt%, CaO: 45wt%, Al 2 o 3 : 20wt%, MgO: 10%, and (CaO+MgO) / (Al 2 o 3 +SiO2 2 ) is 1.22) and quicklime CaO are ground to below 500 mesh respectively, then according to blast furnace slag: lime=1: 0.4 (mass ratio) the blast furnace slag after grinding and lime are mixed uniformly, add water in reaction kettle and make slurry, wherein water : solid=10:1 (mass ratio), stirred at 70°C for 4 hours, then dried and dehydrated at 150°C to obtain the desulfurizer of the present invention, whose specific surface area is 60.2m 2 / g.

[0043] It is used for flue gas semi-dry fixed bed desulfurization. The conditions for flue gas semi-dry fixed bed desulfurization are: temperature 90°C, space velocity 3000 / h, sulfur dioxide concentration in flue gas 4500mg / m 3 , the water vapor content is 5%, after desulfurization, the concentration of sulfur dioxide in the tail gas is less than 200mg / m 3 , the sulfur capacity i...

Embodiment 2

[0045] Take the blast furnace slag (by weight, which includes: SiO 2 : 25%; CaO: 45%; Al 2 o 3 : 20%; MgO: 10%, and (CaO+MgO) / (Al 2 o 3 +SiO2 2 ) is 1.22) and quicklime CaO is the main component, and sodium hydroxide is added in addition, wherein blast furnace slag: lime: sodium hydroxide=1: 0.225: 0.025 (mass ratio), respectively ground to below 500 mesh, mixed evenly, in the reaction kettle Add water to make a slurry, wherein water: solid=15:1 (mass ratio), stir at 50°C for 45min, then dry and dehydrate at 120°C to obtain the desulfurizer of the present invention, whose specific surface area is 63.4m 2 / g.

[0046] It is used for flue gas semi-dry fixed bed desulfurization. The conditions for flue gas semi-dry fixed bed desulfurization are: temperature 90°C, space velocity 3000 / h, sulfur dioxide concentration in flue gas 4250mg / m 3 , the water vapor content is 5%, after desulfurization, the concentration of sulfur dioxide in the tail gas is less than 100mg / m 3 , the s...

Embodiment 3

[0048] Take the blast furnace slag (by weight, which includes: SiO 2 : 25%; CaO: 40%; Al 2 o 3 : 15%; MgO: 20%, and (CaO+MgO) / (Al 2 o 3 +SiO2 2 ) is 1.5) and quicklime CaO is the main component, and calcium chloride and calcium sulfate are added in addition, wherein blast furnace slag: lime: calcium chloride: calcium sulfate=1: 0.17: 0.11: 0.14 (mass ratio), respectively ground to 500 mesh Next, mix well, add water in the reactor to make a slurry, wherein water: solid=20:1 (mass ratio), stir at 60°C for 10h, then dry and dehydrate at 140°C to obtain the desulfurizing agent of the present invention, its ratio Surface area is 68.2m 2 / g.

[0049] It is used for flue gas semi-dry fixed bed desulfurization. The conditions for flue gas semi-dry fixed bed desulfurization are: temperature 100°C, space velocity 3000 / h, sulfur dioxide concentration in flue gas 5200mg / m 3 , the water vapor content is 6%, after desulfurization, the concentration of sulfur dioxide in the tail gas i...

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Abstract

The invention relates to a desulfurizer for desulfurization of smoke and a method for preparing the same. The method for preparing the desulfurizer comprises the following steps of: grinding blast furnace slag and lime respectively and mixing according to a ratio of between 1:1 and 0.07; adding water in the mixture according to a water-solid ratio of between 10 and 25:1 to obtain a size; and stirring the size at a temperature of between 50 and 80 DEG C, and then drying and dewatering the size to obtain the desulfurizer. The desulfurizer also comprises components which are selected from NaOH, phosphoric acid, ammonium phosphate, calcium sulfate and calcium chloride and added in the mixture of the blast furnace slag and the lime. For the blast furnace slag based desulfurizer, the specific surface area is increased from original 7.08 m<2> / g to 79.03 m<2> / g, so that the desulfurization activity of the blast furnace slag based desulfurizer is greatly increased; when the blast furnace slag based desulfurizer is used for a semi-dry method smoke desulfurization process and a dry method smoke desulfurization process, the desulfurization rate can reach more than 95 percent, and the utilization rate of a calcium based absorbent can reach more than 80 percent; in addition, in the desulfurizer, the mass ratio of the blast furnace slag to alkali matters is larger, so that a large amount of the blast furnace slag can be utilized, certain amount of the lime is saved, and the aim of treating wastes by the blast furnace waste slag is achieved.

Description

technical field [0001] The invention belongs to the field of environmental protection materials, and in particular relates to a desulfurizing agent for flue gas desulfurization and a preparation method thereof. Background technique [0002] With the increasingly serious harm of acid rain in the world, the flue gas desulfurization-based desulfurization technology has received more and more attention. Desulfurization technology can be summarized into three categories, namely desulfurization before combustion, desulfurization during combustion and desulfurization after combustion (ie flue gas desulfurization), among which flue gas desulfurization technology is currently the most effective and widely used method for controlling sulfur dioxide emissions in coal-fired power plants A desulfurization technology. According to the desulfurization method and product processing form, flue gas desulfurization can generally be divided into three types: dry method, semi-dry method and wet...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/48
Inventor 叶树峰宫国卓魏连启陈运法
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI