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Alkali desulfurization method and device for lime kiln flue gas

A lime kiln and desulfurization device technology, applied in separation methods, chemical instruments and methods, furnaces, etc., can solve the problems of complex flue gas conditions, large fluctuations in the concentration of target substances to be removed, and large fluctuations in flue gas volume

Pending Publication Date: 2021-08-20
北京铝能清新环境技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Due to the complex flue gas conditions, large fluctuations in the concentration of the target substances to be removed, and large fluctuations in the flue gas volume in the flue gas desulfurization treatment of lime kilns in the aluminum industry, there is currently no technology and equipment that can effectively remove sulfur dioxide in the flue gas. In the case of increasingly stringent particulate matter and sulfur dioxide emission standards in the aluminum industry, as well as the country's increasingly stringent corporate emission requirements, it is necessary to develop technologies and technologies for the purification of lime kiln flue gas in the aluminum industry, especially the removal of sulfur dioxide. device

Method used

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  • Alkali desulfurization method and device for lime kiln flue gas
  • Alkali desulfurization method and device for lime kiln flue gas
  • Alkali desulfurization method and device for lime kiln flue gas

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Embodiment 1

[0056] Attached figure 1 The shown lime kiln flue gas alkali desulfurization method, such as figure 1 As shown, the method includes the following steps:

[0057] Step 1) Conveying flue gas: the lime kiln flue gas after dedusting is pressurized and passed through the lower part of the desulfurization device. The initial sulfur dioxide concentration in the lime kiln flue gas is about 480mg / Nm 3 , the desulfurization device includes a desulfurization absorption tower, and the lower part of the desulfurization device includes the bottom of the desulfurization absorption tower;

[0058] Step 2) Absorption of sulfur dioxide: the lime kiln flue gas entering the desulfurization device passes through the absorption area from bottom to top, the lye is sprayed downward from the upper part of the absorption area, and passes through the absorption area from top to bottom, and the lime kiln flue gas and lye are in the absorption area Fully contacted, the sulfur dioxide in the lime kiln fl...

Embodiment 2

[0061] Attached figure 2 The shown lime kiln flue gas alkali desulfurization method, such as figure 2 As shown, the method includes the following steps:

[0062] Step 1) Conveying flue gas: The lime kiln flue gas after dedusting is pressurized and passed through the lower part of the desulfurization device. The initial sulfur dioxide concentration in the lime kiln flue gas is about 490mg / Nm 3 , the desulfurization device includes a desulfurization absorption tower, and the lower part of the desulfurization device includes the bottom of the desulfurization absorption tower;

[0063] Step 2) Absorption of sulfur dioxide: the lime kiln flue gas entering the desulfurization device passes through the absorption area from bottom to top, and the lye is sprayed downward from the upper part of the absorption area. Realized, the coverage rate of the spray layer is about 260%, passing through the absorption area from top to bottom, the lime kiln flue gas and lye are in full contact i...

Embodiment 3

[0068] This embodiment discloses a lime kiln flue gas alkali desulfurization device, such as figure 1 As shown, it mainly includes lime kiln flue gas delivery unit 1, desulfurization unit 2, lye circulation unit 3, lye delivery unit 4, process water delivery unit 5, oxidation wind delivery unit 6 and tail liquid discharge unit 7. The inlet of the lime kiln flue gas delivery unit 1 is connected to the inlet of the desulfurization absorption tower of the desulfurization unit 2. The lime kiln flue gas delivery unit 1 is located below the desulfurization absorption tower of the desulfurization unit 2. The desulfurization absorption tower is equipped with an oxidation reaction from bottom to top. Zone 2-1, absorption zone 2-2, spray layer 2-3, droplet trapping zone 2-4, external chimney 2-5, lye circulation unit 3 circulation pump inlet pipeline connected to desulfurization absorption tower for reaction area, the lye circulation unit 3 circulation pump outlet pipe is connected to t...

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Abstract

The invention discloses a lime kiln flue gas alkaline desulfurization method and a device thereof. The lime kiln flue gas alkali desulfurization method comprises the steps of flue gas conveying, sulfur dioxide absorption, fog drop removal and the like, and further comprises an oxidation reaction step, wherein an alkali liquor is a waste alkali liquor generated in an aluminum oxide process, and is circulated multiple times in an absorption area, and purified lime kiln flue gas can be recycled. The lime kiln flue gas alkali desulfurization device comprises a lime kiln flue gas conveying unit, a desulfurization unit, an alkali liquor circulating unit, an alkali liquor conveying unit, a process water conveying unit, an oxidation air conveying unit and a tail liquid discharging unit. According to the invention, by adopting the method and the device, sulfur dioxide in lime kiln flue gas can be removed to meet an emission standard by using a waste alkali liquid generated in an aluminum oxide production process, the generated tail liquid can also be used as water for cooling a washing tower, and the flue gas without the sulfur dioxide can be used in an aluminum oxide finished product workshop, so that the emission of waste liquid and waste gas in aluminum oxide production is greatly reduced.

Description

technical field [0001] The invention relates to an industrial waste gas purification treatment technology, in particular to an alkaline desulfurization method and a device for flue gas from a lime kiln. Background technique [0002] At present, my country's air pollutant discharge restrictions are becoming more and more stringent, and the pollutant discharge indicators of most sewage industries are becoming more and more stringent. The "Aluminum Industry Pollutant Discharge Standard" (GB 25465-2010) revision sheet and its revision sheet issued in 2010 stipulates that the particulate matter emission limit is 10mg / m 3 , SO 2 Emission limit is 100mg / m 3 , until 2020, the latest revision of the "Technical Guidelines for Emergency Emission Reduction Measures for Key Industries in Heavy Pollution Weather (2020 Revision)" stipulates that the emission limit of alumina particles in A / B enterprises is 10mg / m 3 , SO 2 The emission limit is 50mg / m 3 . [0003] Due to the complex fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/78B01D53/96F27D17/00
CPCB01D53/501B01D53/502B01D53/78B01D53/96B01D2251/304B01D2251/604B01D2258/0283F27D17/008Y02P10/25
Inventor 王志强殷志成李永艳吴联盟
Owner 北京铝能清新环境技术有限公司
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