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Integrated process for synergistically preparing cementing material through flue gas desulfurization and denitrification

A technology for desulfurization, denitrification, and cementitious materials, applied in gas treatment, chemical instruments and methods, cement production, etc., can solve the problems of low strength of cementitious materials, achieve good oxidation effect, improve flexural strength and compressive strength, The effect of high exposure

Inactive Publication Date: 2021-07-16
可徕卡(上海)环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The strength of the cementitious material prepared by this process is not high

Method used

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  • Integrated process for synergistically preparing cementing material through flue gas desulfurization and denitrification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] (1) Flue gas treatment: The raw flue gas is passed through an electrostatic precipitator to remove part of the particles in the flue gas to obtain the flue gas to be treated, and then sent to the flue gas pipeline before the absorption tower, and the chlorine dioxide-containing gas produced by the chlorine dioxide generator is The chlorine gas enters the flue gas pipeline through the oxidant input device pre-set on the flue gas pipeline before entering the absorption tower, and fully mixes with the flue gas to be treated in the flue gas pipeline to oxidize the NO in the flue gas to be treated into high-valent nitrogen Oxide, to obtain oxidized flue gas. Oxidation flue gas enters the interior of the absorption tower and is fully mixed with the air input by the oxidation fan; the absorbent slurry (calcium hydroxide slurry) is added to the absorption tower through the absorbent adding equipment, and the sodium bisulfite aqueous solution is added to the absorption tower thro...

Embodiment 2

[0076] Except the parameter shown in table 5, all the other are the same as embodiment 1.

[0077] The cementitious material was poured into a formwork of 40mm×40mm×160mm, and then tested. The obtained results are shown in Table 6.

[0078] table 5

[0079] components value unit solid product after grinding 50 parts by weight fly ash 30 parts by weight mineral powder 20 parts by weight Alkali activator (NaOH) 5 parts by weight

[0080] Table 6

[0081] age Compressive strength Flexural strength unit 3d 29 4.9 MPa 7d 42 5.3 MPa 28d 70 11.2 MPa

[0082] Comparing the results of Example 1 and Example 2, it can be seen that the compressive strength and flexural strength of the cementitious material are both increased by appropriately increasing the amount of solid product after grinding and appropriately reducing the amount of fly ash.

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Abstract

The invention discloses an integrated process for synergistically preparing a cementing material by flue gas desulfurization and denitrification, which comprises the following steps: (1) contacting flue gas to be treated with gas containing chlorine dioxide to oxidize nitric oxide in the flue gas to obtain oxidized flue gas, and contacting the oxidized flue gas with absorption slurry containing a calcium-based absorbent and sodium hydrogen sulfite, and obtaining desulfurization and denitrification slurry; wherein the calcium-based absorbent contains calcium oxide and / or calcium hydroxide; (2) dehydrating, drying and grinding the desulfurization and denitrification slurry to obtain a ground solid product; and (3) uniformly mixing the ground solid product, fly ash, mineral powder and an alkali activator to obtain the cementing material. The denitration efficiency is higher, and the obtained cementing material is excellent in performance.

Description

technical field [0001] The invention relates to an integrated process for synergistically preparing cementitious materials from flue gas desulfurization and denitrification. Background technique [0002] Coal-fired flue gas contains harmful substances such as sulfur dioxide and nitrogen oxides. So far, most power plants and industrial boilers are still using traditional desulfurization and denitrification methods, which occupy a large area and cost a lot. The by-products after desulfurization and denitrification Therefore, developing a method that can simultaneously desulfurize and denitrify is the focus of research in the field of flue gas desulfurization and denitrification in recent years. [0003] Gypsum, lime and cement are the three major inorganic cementitious materials with a long history of application. However, in the process of producing these cementitious materials, not only a large amount of coal and electricity resources are consumed, but also a large amount of...

Claims

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Application Information

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IPC IPC(8): C04B7/26C04B7/21C04B7/36B01D53/76B01D53/80B01D53/60
CPCC04B7/243C04B7/1535C04B7/36B01D53/76B01D53/80B01D53/60B01D2258/0283B01D2257/404Y02P40/10
Inventor 童裳慧
Owner 可徕卡(上海)环境科技有限公司