Method for reducing iron sesquioxide in fly ash of coal-fired circulating fluidized bed boiler
A technology of ferric oxide and circulating fluidized bed, which is applied to the removal of solid waste, etc., can solve the problems of inability to use building materials, etc., and achieve the goals of solving ash field conflicts and extra expenses, improving fluidization quality, and prolonging residence time Effect
Active Publication Date: 2015-04-15
TSINGHUA UNIV
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[0003] The object of this invention is to provide a kind of method for ferric oxide in the fly ash of reducing coal-fired circulating fluidized bed boiler, the ferric oxide in the fly ash is reduced to ferric oxide and the fly ash is gray black, to solve The problem that the fly ash cannot be used by the building materials industry due to the red color due to the high content of ferric oxide in the fly ash
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[0014] The mechanism and working process of the present invention will be further described below in conjunction with the accompanying drawings.
[0015] figure 1 It is a schematic diagram of the structure principle of the present invention, including a fluidized bed reactor 2, a combustion chamber 7 and a cyclone separator 6; the fluidized bed reactor includes a material inlet 1, a bottom air distribution device 3, an overflow port 4, discharge port 5. Wherein the overflow port 4 is located at the front section of the fluidized bed reactor, a bottom air distribution device 3 is provided at the lower part of the fluidized bed reactor, an overflow port 4 is provided at the rear section of the fluidized bed reactor, and an overflow port 4 is provided at the lower part of the rear section of the reactor There is a discharge port 5; the upper part of the fluidized bed reactor is provided with a cyclone separator 6; the interior of the fluidized bed reactor is composed of a mixed ...
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Abstract
The invention discloses a method for reducing iron sesquioxide in fly ash of a coal-fired circulating fluidized bed boiler and belongs to the technical field of boiler fly ash treatment. The iron sesquioxide in fly ash of the circulating fluidized bed boiler is reduced by employing a fluidized bed reactor, air gas, water gas or mixed gas of the air gas and water gas serve as fluidized gas and reducing agents in the fluidized bed, the reaction temperature, bed thickness, gas speed and material retention time in the bed in the fluidized bed reactor are reasonably controlled, and the red fly ash is reduced into ash black ferroferric oxide. The problem that the fly ash is red and is not utilized by the architectural material industry is solved, the ash yard contradiction and additional expenditure in electric power plants are solved, and the method has high economic values and application values.
Description
technical field [0001] The invention relates to a technology for reprocessing fly ash of a coal-fired circulating fluidized bed boiler, in particular to a technology for reducing ferric oxide in the fly ash of a coal-fired circulating fluidized bed boiler so that it changes from red to gray black. Background technique [0002] Coal-fired circulating fluidized bed boiler fly ash has high chemical activity due to its combustion temperature of 800-1000°C. It is a high-quality mixing material for cement production and high-quality ground slag for concrete. However, the ash content of a considerable part of coal contains more iron oxide, and the fly ash produced by combustion is fully oxidized to ferric oxide when it leaves the combustion chamber, which is red. Due to the large difference between the red ash and the taupe brown of conventional cement, it was rejected by the building materials industry and had to be discarded; with the increasing capacity of coal-fired circulating...
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IPC IPC(8): B09B3/00B09B5/00
Inventor 杨海瑞张诚晁俊楠汪佩宁胡康涛刘志
Owner TSINGHUA UNIV