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Wet flue gas desulfurization method

A wet flue gas desulfurization and calcium carbide slag powder technology, applied in the field of desulfurization, can solve the problems of reducing the amount of desulfurization agent, slow reaction speed, large water consumption, etc., and achieve the effects of high desulfurization efficiency, low cost, and fast desulfurization speed.

Pending Publication Date: 2022-02-08
山东鲁碧建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Among them, the lime (limestone) absorption method is the most common desulfurization method adopted. The existing CFB boiler furnace wet desulfurization technology has technical problems such as large construction investment, complex system, large water consumption, high price of limestone and large amount of consumption.
[0004] CN106925106B discloses a method for wet desulfurization in a CFB boiler furnace, using industrially discarded calcium carbide mud and / or calcium carbide dedusting ash as a desulfurizing agent, processing industrial wastewater, and preparing a paste desulfurizing agent for desulfurization, reducing the amount of desulfurizing agent, reducing However, when the coal feed rate of the boiler is 60-65t / h, the outlet flue gas flow rate is 5.0±0.1m / s, so that the SO in the flue gas 2 Emission value dropped to 80mg / m 3 Below, the reaction rate is slow and the time required for desulfurization is long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Preparation of composite calcium carbide slag powder

[0029] Roast the wet calcium carbide slag at 450°C to remove moisture until the water content is 2%, then add a certain amount of fast-curing polypropylene emulsion and mix, mix and solidify, send it to a pulverizer to pulverize it into 50-60μm calcium carbide slag dry powder for later use, and mix with granules Kiln dust with a diameter of 100-120 μm is mixed, and a certain amount of silicon carbide powder is added for grinding to obtain composite calcium carbide slag powder;

[0030] The particle size of the composite calcium carbide slag powder is 35 μm, and the calcium oxide content is 65wt%;

[0031] Described kiln dust calcium oxide content 20wt%;

[0032] The composite calcium carbide slag powder includes the following components in parts by mass: 12 parts of calcium carbide slag dry powder, 6 parts of kiln dust, 2 parts of silicon carbide, and 1 part of fast-curing polypropylene emulsion.

[0033] (2) ...

Embodiment 2

[0049] (1) Preparation of composite calcium carbide slag powder

[0050] Roast the wet calcium carbide slag at 420°C to remove moisture until the water content is 1.5%, then add a certain amount of fast-curing polypropylene emulsion and mix, mix and solidify, and send it to a pulverizer to pulverize it into 40-50 μm calcium carbide slag dry powder for later use, and mix it with granules Kiln dust with a diameter of 90-110 μm is mixed, and a certain amount of silicon carbide powder is added for grinding to obtain composite carbide slag powder;

[0051] The particle size of the composite calcium carbide slag powder is 30 μm, and the calcium oxide content is 60wt%;

[0052]Described kiln dust calcium oxide content 18wt%;

[0053] The composite calcium carbide slag powder includes the following components in parts by mass: 13 parts of calcium carbide slag dry powder, 4 parts of kiln dust, 2 parts of silicon carbide, and 2 parts of fast-curing polypropylene emulsion.

[0054] (2)...

Embodiment 3

[0070] (1) Preparation of composite calcium carbide slag powder

[0071] Roast the wet calcium carbide slag at 480°C to remove moisture until the water content is 2.5%, then add a certain amount of fast-curing polypropylene emulsion to mix, mix and solidify, send it to a pulverizer to pulverize it into 60-70μm calcium carbide slag dry powder for later use, and mix it with granules Kiln dust with a diameter of 110-130 μm is mixed, and a certain amount of silicon carbide powder is added for grinding to obtain composite calcium carbide slag powder;

[0072] The particle size of the composite calcium carbide slag powder is 40 μm, and the calcium oxide content is 70wt%;

[0073] Described kiln dust calcium oxide content 22wt%;

[0074] The composite calcium carbide slag powder includes the following components in parts by mass: 11 parts of calcium carbide slag dry powder, 5 parts of kiln dust, 3 parts of silicon carbide, and 2 parts of fast-curing polypropylene emulsion.

[0075]...

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Abstract

The invention relates to a wet flue gas desulfurization method. The desulfurization method comprises the following steps: preparing composite carbide slag powder, preparing ash particles, and mixing and spraying for desulfurization. According to the desulfurization method, the desulfurization speed is high, the coal feeding amount of a boiler is 75-85 t / h, the sulfur content of coal is 0.45-0.55 wt%, the original emission value of SO2 in the flue gas before desulfurization of the CFB boiler is 920-970 mg / m<3>, and the emission value of SO2 in the flue gas is 49-52 mg / m<3> when the outlet flue gas flow speed is 4.5-5.5 m / s. The desulfurization method disclosed by the invention is high in desulfurization efficiency, the calcium-sulfur ratio is 1.2-1.22, and the desulfurization rate is 94.64-94.7%.

Description

technical field [0001] The invention relates to a wet flue gas desulfurization method, which belongs to the technical field of desulfurization. Background technique [0002] Wet flue gas desulfurization uses alkaline aqueous solution or slurry to absorb sulfur dioxide in flue gas. According to the type of absorbent used or by-products, it can be divided into ammonia absorption method, lime (limestone) absorption method, magnesium oxide absorption method, etc. [0003] Among them, the lime (limestone) absorption method is the most common desulfurization method adopted. In the existing CFB boiler furnace wet desulfurization technology, there are technical problems such as large construction investment, complex system, large water consumption, high price of limestone and large consumption. [0004] CN106925106B discloses a method for wet desulfurization in a CFB boiler furnace, using industrially discarded calcium carbide mud and / or calcium carbide dedusting ash as a desulfuri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/80
CPCB01D53/502B01D53/80B01D2258/0283B01D2251/404B01D2251/602
Inventor 刘汝海赵振华孙健吕新锋崔博谷向民王敏朱桂芝
Owner 山东鲁碧建材有限公司