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Method and device for desulfurizing cement kiln flue gas by using white mud

A cement kiln and white mud technology, which is applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of complex process flow, high cost, heavy maintenance workload, etc., and achieves increased specific surface area, The effect of increasing the contact area and reducing the cost

Active Publication Date: 2020-09-15
崇左南方水泥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The desulfurization efficiency is 70-80%, but there are problems such as pipeline blockage and heavy maintenance workload
(3) The wet desulfurization method has the best effect, the desulfurization efficiency can reach 80-95%, and there are few problems of clogging and maintenance, but the cost is high. The cost of rebuilding a 5,000-ton production line per day is as high as 80 million yuan, and the estimated operating cost per ton of clinker Add about 4 yuan
[0008] The above patents and some other disclosed patent technologies provide various methods for preparing desulfurizers from lime mud for desulfurization, but the process is relatively complicated and the cost is high, and it does not involve application in cement plants

Method used

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  • Method and device for desulfurizing cement kiln flue gas by using white mud
  • Method and device for desulfurizing cement kiln flue gas by using white mud
  • Method and device for desulfurizing cement kiln flue gas by using white mud

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Effect test

Embodiment 1

[0042] The method for desulfurizing cement kiln flue gas by using white mud comprises the following steps: mixing white mud and high-carbon fly ash, drying and breaking them up, and using the high-temperature tertiary air of the cement kiln to heat them to decompose them, Generate a loose and porous composite desulfurizer, and then introduce it into the ascending pipe from the second-stage cyclone preheater to the first-stage cyclone preheater of the cement kiln, and mix and react with the flue gas to complete the desulfurization of the cement kiln flue gas.

[0043] Specifically, white mud is added to the flue gas desulfurization system of the cement kiln for flue gas desulfurization;

[0044] The cement kiln flue gas desulfurization system includes: a lime mud pretreatment unit, a desulfurizer generating unit and a desulfurization unit;

[0045] The lime mud pretreatment unit includes a first storage bin, a belt conveyor, a breaking classifier and a second storage bin;

[0...

Embodiment 2

[0080] Utilize lime mud to carry out the method for desulfurizing cement kiln flue gas, and embodiment 1 is basically the same, and difference is:

[0081] In the white mud pretreatment of step (1), the carbon content in the high-carbon fly ash is 20%; the water content of the white mud is 30%; the mass ratio of the white mud to the high-carbon fly ash It is 2:1.

[0082] In the generation of the desulfurizer in step (2), the delivery amount of the mixed powder delivered to the high-temperature air supply pipe 8 is 2% of the cement raw meal weight.

Embodiment 3

[0084] Utilize lime mud to carry out the method for desulfurizing cement kiln flue gas, and embodiment 1 is basically the same, and difference is:

[0085] In the white mud pretreatment of step (1), the carbon content in the high-carbon fly ash is 30%; the water content of the white mud is 40%; the mass ratio of the white mud to the high-carbon fly ash It is 4:1.

[0086] In the generation of the desulfurizer in step (2), the delivery amount of the mixed powder delivered to the high-temperature air supply pipe 8 is 5% of the cement raw meal weight.

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Abstract

The invention discloses a method for desulfurizing flue gas of a cement kiln by using white mud, and belongs to the technical field of cement kiln flue gas desulfurization. The method provided by theinvention comprises the following steps: mixing white mud, high-carbon fly ash and ammonium bicarbonate according to a certain proportion, drying and scattering the mixture, heating the mixture by using high-temperature tertiary air of a cement kiln to decompose the mixture to generate loose and porous composite powder, introducing the composite powder into an ascending pipeline from a second-stage cyclone preheater to a first-stage cyclone preheater of the cement kiln, and mixing and reacting the composite powder with the flue gas to finish desulfurization of the flue gas of the cement kiln.According to the method, recycling of the white mud and the high-carbon fly ash is achieved, meanwhile, a desulfurization system is simplified, the desulfurization efficiency is improved, and the desulfurization cost of cement enterprises is reduced.

Description

technical field [0001] The invention belongs to the technical field of flue gas desulfurization of cement kilns, and in particular relates to a method and a device for desulfurizing flue gas of cement kilns by utilizing lime mud. Background technique [0002] Cement Enterprise SO 2 Emissions from raw materials and fuels originate from two sources, mainly from the oxidation of inorganic and organic sulfur in raw materials and fuels. Pyrite and marcasite (FeS 2 ) or some sulfides (FeS), which are oxidized to SO in the 1st and 2nd stage cyclone preheaters 2 gas, these SO 2 Part of the gas is absorbed by the alkaline material, and the other part is discharged into the chimney at the end of the kiln after passing through the humidification tower or raw meal vertical mill; while the SO in the fuel 2 , most of them can be combined with high temperature alkaline hot raw meal (rich in CaO) and O 2 A reaction occurs to form sulfates. Therefore, the SO in the kiln tail gas 2 It ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/83B01D53/50
CPCB01D53/508B01D53/83B01D2251/404B01D2258/0233B01D2258/0283
Inventor 徐迅季军荣武双磊谢卫东刘信超周洲帅祖义
Owner 崇左南方水泥有限公司
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