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Method for utilizing semidry desulfurization ash in wet flue gas desulfurization process

A wet flue gas desulfurization and semi-dry desulfurization technology, applied in chemical instruments and methods, calcium/strontium/barium sulfate, inorganic chemistry, etc., can solve the problems of low added value and long transportation distance, and achieve improved The effect of side bonuses

Inactive Publication Date: 2017-11-03
武汉钢铁有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The embodiment of the present invention provides a method for utilizing semi-dry desulfurization ash under the wet flue gas desulfurization process, which is used to solve the technical problems of long transportation distance and low side-added value existing in the existing technology of reusing desulfurization ash

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  • Method for utilizing semidry desulfurization ash in wet flue gas desulfurization process

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Embodiment 1

[0059] The desulfurization ash is obtained from the rotary spray semi-dry desulfurization process, and the main component is CaCO 3 Content 25.2%, CaSO 3 .2H 2 O content 34.9%, CaSO 4 Content 19.3% and Ca(OH) 2 The content is 20.1%, and the impurity content is 0.5%. CaCO in limestone 3 The content is 91.7%, and the particle size is less than 200 mesh. Put the desulfurized ash and limestone into the desulfurized ash slurry tank and the limestone slurry tank respectively according to the mass ratio of 0.3:1, and then add water to make desulfurized ash slurry and limestone slurry respectively. Specifically, the solid concentration of the desulfurized ash slurry and the limestone slurry is 15%. In addition, a 5% ethanol solution was added to the desulfurization ash pulping tank for defoaming. The prepared desulfurization ash slurry and limestone slurry are respectively input into the desulfurization tower and used as desulfurizers. Oxidation fan according to 2000m 3 / h Fi...

Embodiment 2

[0061] The desulfurization ash is taken from the semi-dry desulfurization process of the circulating fluidized bed, and the main component is CaCO 3 Content 23.2%, CaSO 3 .2H 2 O content 28.9%, CaSO 4 Content 26.3% and Ca(OH) 2 The content is 20.1%, and the impurity content is 1.5%. CaCO in limestone 3 The content is 92.7%, and the particle size is less than 200 mesh. Put the desulfurized ash and limestone into the desulfurized ash slurry tank and the limestone slurry tank respectively according to the mass ratio of 0.2:1, and then add water to make desulfurized ash slurry and limestone slurry respectively. Specifically, the slurry solids concentration was 12%. Add 5% ethanol solution to the desulfurization ash pulping tank for defoaming. The prepared desulfurization ash slurry and limestone slurry are respectively input into the desulfurization tower and used as desulfurizers. Oxidation fan according to 1900m 3 / h Fill the desulfurization tower with oxygen, on the on...

Embodiment 3

[0063] The desulfurization ash is obtained from the new integrated semi-dry desulfurization process, and the main component is CaCO 3 Content 25.2%, CaSO 3 .2H 2 O content 37.9%, CaSO 4 Content 7.9% and Ca(OH) 2 The content is 28.1%, and the impurity content is 0.9%. CaCO in limestone 3 The content is 94.7%, and the particle size is less than 200 mesh. Put the desulfurized ash and limestone powder into the desulfurized ash slurry tank and limestone slurry tank respectively according to the mass ratio of 0.5:1, and then add water to make desulfurized ash slurry and limestone slurry respectively. Specifically, the slurry solids concentration was 14%. A 3% methanol solution was added to the desulfurization ash pulping tank for defoaming. The prepared desulfurization ash slurry and limestone slurry are respectively input into the desulfurization tower and used as desulfurizers. Oxidation fan according to 2200m 3 / h Fill the desulfurization tower with oxygen, on the one ha...

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Abstract

The invention relates to the technical field of metallurgy, in particular to a method for utilizing semidry desulfurization ash in a wet flue gas desulfurization process. The method comprises the following steps: adding a desulfurization ash slurry into a desulfurizing tower in the wet desulfurization process; adding a limestone slurry into the desulfurizing tower, and reacting the desulfurization ash slurry and the limestone slurry with sulfur dioxide-containing flue gas in the desulfurizing tower to produce calcium sulfate; compressing, dehydrating, drying and packaging the calcium sulfate to obtain gypsum. The method is used for solving the technical problems that in the conventional desulphurization ash reutilizing technology, the transporting distance is long and the added value is low.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for utilizing semi-dry desulfurization ash under a wet flue gas desulfurization process. Background technique [0002] A large amount of SO is produced in the traditional electric power and sintering production process 2 Smoke, causing serious pollution to the environment. According to whether water is added in the desulfurization process and the form of by-products after desulfurization, the flue gas desulfurization technology can be divided into dry method, semi-dry method and wet method. The dry desulfurization efficiency is low, the wet desulfurization efficiency is high, but the corrosion problem is prominent, and the semi-dry method has the advantages of no corrosion, no waste water and relatively high desulfurization efficiency. However, with the popularization of semi-dry desulfurization technology, the problem that its by-product desulfurization ash is diff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46
CPCC01F11/464C01P2006/80
Inventor 卢丽君吴高明康凌晨薛改凤张垒李丽坤刘瑛
Owner 武汉钢铁有限公司
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