Method and device for removing gaseous pollutants from exhaust gases

A pollutant and exhaust gas technology, applied in the field of removing gaseous pollutants, can solve problems such as large pressure loss, low utilization rate of reaction reagents, and problems caused by control operations
CN100372593CInactive Publication Date: 2008-03-05OUTOKUMPU OY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
OUTOKUMPU OY
Publication Date
2008-03-05
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention relates to a method for removing gaseous pollutants from exhaust gases, in which the gaseous pollutants react with a fine-grained reactant by forming solids in a fluidized-bed reactor (2), and to a corresponding plant. To achieve low pollutant concentrations in the clean gas with an almost stoichiometric consumption of reactant, it is proposed to introduce the exhaust gas from below through a preferably central gas supply tube (20) into a mixing chamber (21) of the reactor (2), the gas supply tube (20) being at least partly surrounded by a stationary annular fluidized bed (22) of reactant, which bed is fluidized by supplying fluidizing gas, and to adjust the the gas velocities of the exhaust gas and of the fluidizing gas for the annular fluidized bed (22) such that the Particle-Froude-Numbers in the gas supply tube (20) are between 1 and 100, in the annular fluidized bed (22) between 0.02 and 2, and in the mixing chamber (21) between 0.3 and 30.
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Description

technical field

[0001] The invention relates to a method for removing gaseous pollutants from waste gas, wherein the gaseous pollutants and fine-grained reagents react in a fluidized bed reactor to form solids, and to a corresponding device. Background technique

[0002] These methods and devices are suitable, for example, for the removal of acid gases such as SO from gas streams produced by combustion plants such as power plants, waste and special waste incineration plants or other heat producing processes such as the production of aluminum in electrolytic cells 2 , HF and HCl. For this purpose, a number of different wet, dry and semi-dry methods have been developed, in which the removal of acidic components is carried out by adding alkaline reagents. In the case of the dry process, entrained bed and fluidized bed methods are used, especially those using circulating Venturi-type fluidized beds.

[0003] Compared with the fixed fluidized bed, the circulating fluidized bed ...

Claims

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