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Integrated method for dry desulfurization and denitrification and cementing material manufacturing

A gelling material and dry desulfurization technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of high cost and expensive, and achieve the effects of low cost, high denitrification efficiency and desulfurization efficiency

Inactive Publication Date: 2021-07-16
中晶新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the method of this invention can solve the recycling problem of desulfurization and denitrification ash residue, the method still uses expensive ozone oxidation, resulting in higher cost

Method used

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  • Integrated method for dry desulfurization and denitrification and cementing material manufacturing

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Embodiment approach

[0077] According to one embodiment of the present invention, the cementitious material is composed of the following raw materials in parts by weight: 25-55 parts by weight of the first ash, 15-55 parts by weight of fly ash, and 15-45 parts by weight of mineral powder and alkali activator are 4-8 parts by weight. According to another embodiment of the present invention, the cementitious material is composed of the following raw materials in parts by weight: 30-50 parts by weight of the first ash, 20-50 parts by weight of fly ash, and 20-45 parts by weight of mineral powder and alkali activator are 5-7 parts by weight. According to yet another embodiment of the present invention, the cementitious material is composed of the following raw materials in parts by weight: 35-45 parts by weight of the first ash, 25-45 parts by weight of fly ash, and 20-40 parts by weight of mineral powder parts and alkali activator are 5-6 parts by weight.

[0078] Before mixing the raw materials in...

Embodiment 1

[0084] The schematic diagram of the device used for the integrated method of dry desulfurization and denitrification and cementitious material production of the present invention is as follows figure 1 shown. Use the electrostatic precipitator 5 to remove particulate matter from the raw flue gas from the sintering machine to obtain dust-removed flue gas. Pass the dedusting flue gas into the flue gas duct. Aqueous hydrogen peroxide solution (concentration is 27.5wt%) is supplied to the atomizer 4 that is positioned at the flue gas pipeline by aqueous hydrogen peroxide supply device 3; Then aqueous hydrogen peroxide is sprayed to flue gas pipeline by atomizer 4 Inside, it contacts and reacts with the dedusting flue gas in the flue gas pipe to form oxidized flue gas.

[0085] Pass the oxidized flue gas into the dense phase dry tower 6, and simultaneously spray the calcium hydroxide dry powder and the ammonium bisulfite dry powder into the dense phase dry tower 6 through the abs...

Embodiment 2

[0099] The difference from Example 1 is only that the raw material composition ratio of the gelling material is different. Refer to Table 5 for the dosage of each raw material of the gelling material in this embodiment. The properties of the obtained gelled material are shown in Table 6.

[0100] Table 5, the amount of each raw material of the cementitious material

[0101] parameter value unit first ash 45 parts by weight fly ash 35 parts by weight mineral powder 20 parts by weight Alkali activator (NaOH) 5 parts by weight

[0102] Table 6. Properties of cementitious materials

[0103] age Compressive strength Flexural strength unit 3d 33 4.7 MPa 7d 39 6.9 MPa 28d 73 11.1 MPa

[0104] It can be seen from the table that the flexural strength and compressive strength of the obtained cementitious material can reach the relevant national standard of 52.5 grade cement.

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Abstract

The invention discloses an integrated method for dry desulfurization and denitrification and cementing material manufacturing. The method comprises the following steps: (1) sequentially carrying out pre-dedusting, oxidation and desulfurization and denitrification treatment on raw flue gas to form desulfurized and denitrified flue gas; (2) carrying out dust removal treatment on the desulfurized and denitrified flue gas to obtain ash residues; wherein the ash slag comprises first ash slag and second ash slag; and (3) uniformly mixing the raw materials including the first ash, the fly ash, the mineral powder and the alkali activator to obtain the cementing material, wherein the content of the first ash is 25-55 parts by weight, the content of the fly ash is 15-55 parts by weight, the content of the mineral powder is 15-45 parts by weight, and the content of the alkali activator is 4-8 parts by weight. The method disclosed by the invention is high in denitration efficiency, and the strength of the cementing material is relatively high.

Description

technical field [0001] The invention relates to an integrated method of dry desulfurization and denitrification and cementitious material production. Background technique [0002] Sulfur dioxide and nitrogen oxides mainly come from the flue gas emitted by large quantities of coal-fired power plants. In order to effectively control the emission of harmful gases in coal-fired flue gas, extensive research and engineering practice on desulfurization and denitrification have been carried out at home and abroad. Most of the currently used processes are single desulfurization and denitrification devices; they occupy a large area and have high investment and operating costs. Therefore, the integrated desulfurization and denitrification process has been paid more and more attention. [0003] Flue gas desulfurization and denitrification will produce ash, which includes desulfurization ash. The reuse of ash waste including desulfurization ash can not only solve environmental problem...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/78B01D53/83B01D53/60
CPCB01D53/75B01D53/78B01D53/83B01D53/60B01D2251/106
Inventor 童裳慧
Owner 中晶新材料有限公司
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