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Digestive circulating fluid bed flue gas desulfurization method and device

A circulating fluidized bed and desulfurization device technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of construction costs, high operating costs, large amount of by-products, and large floor space. Achieve the effects of desulfurization, high desulfurization efficiency, and small footprint

Inactive Publication Date: 2009-10-21
周建安
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main problems of the existing dry and semi-dry flue gas desulfurization technologies are complex system, large floor area, high construction and operation costs, relatively low desulfurization efficiency, and large amount of by-products to be processed

Method used

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  • Digestive circulating fluid bed flue gas desulfurization method and device
  • Digestive circulating fluid bed flue gas desulfurization method and device

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Such as figure 1 and figure 2 As shown, the digestion circulation fluidized bed flue gas desulfurization tower of the present invention includes three sections: a pre-dust removal section (lower section), a Venturi tube bundle section (middle section), and a digestion reaction section (upper section).

[0031] The lower part of the desulfurization tower is the pre-dust removal section 12, the side wall is provided with a flue gas inlet 1, the bottom is provided with an ash discharge port, and an ash discharge valve 13 is installed, and a flue gas inlet guide plate 10 is arranged above the flue gas inlet in the pre-dust collector.

[0032] The inner diameter of the middle section of the desulfurization tower is 4 meters. The upper part of the middle section of the desulfurization tower, namely the pre-dust removal section, is the Venturi tube bundle section 2, and 7 Venturi tubes are closely arranged vertically inside.

[0033]The upper section of the desulfurization t...

Embodiment 2

[0036] The flue gas volume of a sintering plant is 2000m 3 / h, sulfur dioxide content 700mg / Nm 3 , flue gas temperature 120 ℃. The flue gas desulfurization process of the present invention is used for desulfurization treatment, and the flue gas temperature at the outlet of the secondary dust collector is ≥70°C.

[0037] The relevant operating parameters of this embodiment are as follows:

[0038] Desulfurization agent consumption 2.5kg / h

[0039] Digested water consumption 2.2kg / h

[0040] Humidification water consumption 60kg / h

[0041] Supplementary water consumption 2kg / h

[0042] Ca / S(mol / mol)=1.2

[0043] Circular ash return 4.5kg / h

[0044] After treatment, the sulfur dioxide content is 56mg / Nm 3 , the desulfurization rate is 92%.

[0045] The specific process engineering is as follows.

[0046] The blocky quicklime is sent into the mill 18 through the block lime inlet 17, and the quicklime powder is ground by the mill 18, and the lime powder with a particle si...

Embodiment 3

[0052] The flue gas volume of a sintering plant is 10000m 3 / h, sulfur dioxide content 800mg / Nm 3 , flue gas temperature 120 ℃. The flue gas desulfurization process of the present invention is used for desulfurization treatment, and the flue gas temperature at the outlet of the secondary dust collector is ≥70°C.

[0053] The relevant operating parameters of this embodiment are as follows:

[0054] Desulfurization agent consumption 12kg / h

[0055] Digested water consumption 11kg / h

[0056] Humidification water consumption 320kg / h

[0057] Supplementary water consumption 10kg / h

[0058] Ca / S(mol / mol)=1.3

[0059] Circular ash return 25kg / h

[0060] After treatment, the sulfur dioxide content is 40mg / Nm 3 , the desulfurization rate is 95%.

[0061] The specific process is as follows.

[0062] Grind the massive quicklime with a particle size of 80mm into quicklime powder by a mill, and grind the blocky quicklime into quicklime powder by a mill. After classification, use ...

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Abstract

A digestive circulating fluid bed flue gas desulfurization method and a device belong to the technical field of environment-friendly flue gas treatment. The device comprises a pre-dust removal section, a Venturi tube bundle section and a digestive reaction section, and is provided with a three-stage atomized water spray device. As for lime adopted in the desulfurization process, the mass is T6080% and the grain size<0.048mm; the desulfurization reaction temperature is controlled between 75 DEG C and 90 DEG C; proper weight ratio of a desulfurizer and water is controlled so that the flue gas temperature at the exit of a secondary deduster >=70 DEG C; the mol ratio of Ca / S is controlled to be 1.0-1.6; the flue gas residence time is controlled to be 1-3s. The digestive circulating fluid bed desulfurizer integrates the designs of the pre-dust remover, the lime slaking reactor and the circulating fluid bed desulfurizer into a whole and has the functions of pre-dust removal, lime slaking and desulfurization. By adopting the technology of the invention, the floor area of the system can be saved and the investment on equipments can be reduced.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to industrial flue gas treatment technology, in particular to a circulating fluidized bed flue gas desulfurization method and device. Background technique [0002] The iron and steel industry is the pillar industry of my country's national economy. But it is also a major polluter. Sintering production is an important process unit of modern iron and steel production, contributing as much as 40% to 60% to the emission of sulfur dioxide in the iron and steel industry. Therefore, it is very important to control the emission of sulfur dioxide in the production process of sintering machine. Usually sintering flue gas SO 2 Emission reduction and control measures mainly include low-sulfur raw material mixing method, high chimney diffusion dilution method, and tail sintering flue gas desulfurization method. Among them, the tail sintering flue gas desulfurization method is ...

Claims

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Application Information

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IPC IPC(8): B01D53/83B01D53/50
Inventor 周建安党君祥李旭
Owner 周建安
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