Material returning device of CFB boiler
A boiler and feeding technology, which is applied in the field of CFB boiler feeding devices, can solve the problems of increased combustibles, low combustion temperature, and reduced denitrification efficiency of ammonia spraying water, so as to reduce the amount of circulating ash, reduce the amount of circulating ash, Effect of increasing combustion temperature and denitrification efficiency
Active Publication Date: 2018-02-27
WUXI HUAGUANG BOILER
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Problems solved by technology
The improvement of the separation efficiency of the high-temperature cyclone separator has also brought new problems: when the boiler is operating at low load, the separation efficiency of the separator will not decrease much with the decrease of the load, resulting in low combustion temperature, slag and fly ash may be Combustion material rises, the flue gas temperature at the furnace outlet is lower than the "SNCR" denitrification temperature window, and the denitrification efficiency of ammonia injection decreases
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Embodiment Construction
[0012] See figure 1 , figure 2 , image 3 As shown, a material return device for a CFB boiler includes a material return box 1, the upper end of the material return box 1 is connected to the separator standpipe 2, and the lower end is connected to the air chamber 3 of the material return box, and the material return box 1 includes a loose area 1-1 And the fluidization area 1-2, the fluidization area 1-2 is provided with the fluidization wind cap 4 and the delivery wind cap 5, the loosening area 1-1 is provided with the loosening wind cap 6, and the fluidization area 1-2 is also provided with an independent wind cap 7. The opening rate of the hood head of the independent hood 7 is greater than that of the loose hood 6. The bottom of the independent hood 7 is connected to the return air duct 8, and the independent hood 7 is facing the center of the separator riser 2, which can be better The normal centrifugal force air flow inside the cyclone separator is greatly affected, th...
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The invention relates to the field of CFB boiler equipment, in particular to a material returning device of a CFB boiler. By means of the material returning device, the concentration of circulation ash entering a hearth can be reduced, and the combustion temperature and the denitration efficiency are improved. The material returning device comprises a material returning box. The upper end of the material returning box is connected with a separator vertical pipe, and the lower end of the material returning box is connected with a material returning box air chamber. The material returning box comprises a loosening area and a fluidization area. The fluidization area is provided with a fluidization air hood and a conveying air hood. The loosening area is provided with a loosening air hood. Thefluidization area is further provided with an independent hood. The aperture ratio of a hood head of the independent hood is larger than the aperture ratio of a hood head of the loosening air hood, and the bottom of the independent hood is connected with a material returning air pipe.
Description
technical field [0001] The invention relates to the field of CFB boiler equipment, in particular to a feeding device for a CFB boiler. Background technique [0002] The circulating circuit of the circulating fluidized bed boiler is composed of a furnace, a high-temperature cyclone separator, and a feeding device. With the continuous improvement of the research level of the high-temperature cyclone separator, the separation efficiency of the high-temperature cyclone separator in the CFB boiler has been increased to about 99.6%, coupled with the optimization of the secondary air arrangement, air distribution arrangement, and return material arrangement, the boiler's The original emission concentration of NOx and SO2 is greatly reduced; the factory power consumption of CFB auxiliary equipment is also reduced. The improvement of the separation efficiency of the high-temperature cyclone separator has also brought new problems: when the boiler is operating at low load, the separa...
Claims
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IPC IPC(8): F23C10/26
CPCF23C10/26F23C2206/10Y02E20/34
Inventor 钱钢
Owner WUXI HUAGUANG BOILER