Desulfuration process for sintering flue gas

A desulfurization process, sintering flue gas technology, applied in the separation of dispersed particles, chemical instruments and methods, separation methods, etc., can solve the problems of complex chemical components of by-products, low reaction rate of desulfurizers, secondary pollution of the environment, etc. Discharge and follow-up treatment costs, not easy to deteriorate, and the effect of simplifying the operation process

Inactive Publication Date: 2010-10-20
MAANSHAN IRON & STEEL CO LTD
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AI Technical Summary

Problems solved by technology

During operation, the reaction rate of the desulfurizer is low, only about 50%; and the chemical composition of by-products after desulfurization is complex: the typical composition is calcium sulfite 20-3

Method used

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Examples

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Example Embodiment

[0026] Example 1:

[0027] A desulfurization process for sintering flue gas includes a desulfurization agent preparation system, a desulfurization system, and a recovery treatment system. The desulfurization agent is sodium bicarbonate powder with a pass rate of not less than 75% through a standard sieve of 0.045 mm. The micro powder is sprayed in the desulfurization tower in the desulfurization system, and the powdery particles are in full contact with the flue gas, and the sodium bicarbonate and the acid gas SO in the flue gas 2 And SO 3 A neutralization reaction occurs, reducing the concentration of sulfur oxides in the flue gas. When the residual sodium bicarbonate content (weight) in the desulfurizer is 8%, the by-products of desulfurization are mainly sodium sulfate, sodium sulfite, and sodium bicarbonate. The weight ratio of sodium sulfate: sodium sulfite: sodium bicarbonate is 1:3 :1, discharge the desulfurization by-products from the desulfurization system into the recov...

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Abstract

The invention discloses a desulfuration process for sintering flue gas, which adopts a desulfuration agent preparation system, a desulfuration system and a reclamation treatment system. The desulfuration agent is sodium bicarbonate, the 0.045mm standard sieve passing rate of which is no less than 75 percent. Compared with the prior art, the desulfuration process has the advantages that: the processing cost is over 30 percent lower than the cost of slaked lime; the prepared solid desulfuration agent is not easy to deteriorate, and has longer storage life compared with calcium hydroxide; the desulfuration efficiency is improved, and the running cost is reduced; the operation process is simplified; the desulfurized byproducts can be conveniently processed and utilized; and the produced mixture of calcium sulfate, calcium sulfite and calcium carbonate can be conveniently used for producing environment-friendly building materials such as lightweight building blocks, is far more stable than the current desulfurized byproducts and is easier to utilize so as to furthest reduce the discharge of solid wastes and the subsequent treatment expense and meet the current environment-friendly policy.

Description

technical field [0001] The invention belongs to the desulfurization process of sintering flue gas, in particular to the desulfurization process of semi-dry circulating fluidized bed sintering flue gas. Background technique [0002] The main properties and components of sintering flue gas in iron and steel plants are SO 2 600-4800mg / m 3 , a small amount of sulfur trioxide, dust content 100-450mg / m 3 , moisture content 7%-15%, temperature 85°C-190°C, smoke volume greater than 20×10 4 m 3 / hour. Even at the same emission point, SO in flue gas 2 The content may also fluctuate greatly in different time periods. Circulating fluidized bed semi-dry process is a relatively advanced desulfurization process. It is an imported project from VAI. It is mainly composed of desulfurization agent preparation system, desulfurization system and dust collection system. Slaked lime powder with high specific surface is used as desulfurization agent. In the process of lime digestion, in orde...

Claims

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Application Information

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IPC IPC(8): B01D53/82B01D53/50
Inventor 周晨辉丁陈来汪为民吴朝刚饶磊张耀辉
Owner MAANSHAN IRON & STEEL CO LTD
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