Method for absorbing SO2 in smoke and removing dust from coal boiler

A technology for sulfur dioxide and coal-fired boilers, which is applied to chemical instruments and methods, separation methods, and separation of dispersed particles. It can solve problems such as Bayer red mud pollution, and achieve low operating costs, good effects, and convenient operation.

Inactive Publication Date: 2006-11-15
GUIYANG AL-MG DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of absorbing sulfur dioxide and sulfur dioxide in coal-fired boiler flue gas which has low operating cost, good desulfurization and dust removal effect, simple and convenient use, and can simultaneously solve the problem of Bayer red mud pollution generated in the production of aluminum industry. The method of dedusting to overcome the deficiencies of the existing technology, and at the same time achieve the purpose of "treating waste with waste and comprehensive utilization"

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1 of the present invention: when the coal-fired coal fired by the coal-fired boiler receives the base total sulfur content S t.ar ≤3%, the flue gas discharged from the boiler when burning coal is firstly dedusted through the pre-dust collector according to the existing method, and then the flue gas dedusted by the pre-dust collector is passed into a chamber equipped with Bayer red mud In the desulfurization tower, the desulfurization tower can be designed as a sealed container connected with the second-stage dust collector to control the particle size of the red mud in the Bayer red mud slurry: 100 mesh to 320 mesh, and the Bayer red mud The red mud liquid-solid ratio of the mud is controlled in the range of 1 to 7:1 and the temperature of Bayer red mud is controlled in the range of 25°C to 65°C and the pH value of Bayer red mud is controlled in the range of 1.5 to 3.5 , so that the flue gas passed into the desulfurization tower can fully contact with Bayer r...

Embodiment 2

[0018] Embodiment 2 of the present invention: when the coal-fired coal fired by the coal-fired boiler receives the base total sulfur content S t.ar When it is greater than 3%, add limestone powder to the coal, and then send the coal mixed with limestone powder into the boiler for combustion. The ratio range of the sulfur content S is best controlled within the range of Ca / S = 1.5-2.0, and the particle diameter of the limestone powder is controlled within the range of 0.01 mm to 2 mm, and then the smoke discharged from the boiler combustion coal is The gas is sent to the pre-dust collector for dust removal, and the flue gas that has been dedusted by the pre-dust collector is passed into a desulfurization tower equipped with Bayer red mud, and the desulfurization tower can be designed as a second-stage dust collector. A sealed container, control the particle size of the red mud in the Bayer red mud slurry: 100 mesh to 320 mesh, and control the red mud liquid-solid ratio of the B...

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Abstract

The invention includes the following steps of first removing the dust from the smoke exhaust when firing the coal in the boiler via a dust preremover; loading the dust-removed smoke into a desulfurizing tower with the Bayer red mud inside; desulfurizing after making contact of the smoke led into the desulfurizing tower with the Bayer red mud; then removing the dust from the desulfurizing smoke led into the second-stage dust-remover and at last discharging the smoke treated by desulfurizing and dust-removing from the chimney.

Description

Technical field: [0001] The invention relates to a method for absorbing sulfur dioxide in flue gas of a coal-fired boiler and removing dust, belonging to the technical field of flue gas desulfurization. Background technique: [0002] At present, the three wastes of the aluminum industry mainly include a large amount of sulfur dioxide waste gas and smoke generated by boiler coal combustion, solid waste such as fluorine-containing gas and residual poles generated during the electrolysis process, and red mud generated by the alumina production system. The discharge of these wastes will cause air pollution. , soil and water pollution, affecting the ecological environment and the growth of crops and human health in the surrounding areas. Red mud is the waste residue produced when alumina is extracted from bauxite. Its performance varies with the process of refining alumina and the raw materials used. The main components of Bayer red mud are CaO: 15-30%, SiO 2 : 6 ~ 15% also cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23J15/02B01D53/00
Inventor 徐树涛曹斌李军旗吴孝玉杨小平
Owner GUIYANG AL-MG DESIGN & RES INST
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