Method and apparatus for flyash bottom-feeding circulating fluidized bed for fire-resistance fuel

Abstract

The combustion device is composed of a fly ash collector, a return controller, a pneumatic conveying injector and a combustion furnace. The upper part of the combustion furnace is connected to the inlet of the fly ash collector. The device makes it sent to the dense-phase area of ​​the combustion furnace through the bottom feeding nozzle installed in the combustion furnace. The return controller includes a shell, a bed body and an air chamber in the shell, an air distribution plate in between, and an inlet in the air chamber. Air outlet, there are standpipes and lower ash pipes on the bed body, the standpipes extend into the shell, there are air holes on the air distribution plate, there are guide hoods on the air holes of the air distribution plate in the area below the standpipe, and there are guide hoods on the guide hood. The air hole and the guide air hole are composed of interlinked axial and radial air outlet holes. The radial air outlet faces the discharge side, and the air hole of the air distribution plate in the lower area of ​​the discharge side is provided with a wind cap. Air inlet hole, the air inlet hole is composed of intercommunicating axial holes and radial holes, there is an air chamber partition at the boundary between the guide air cap and the air cap, and an air inlet is arranged on the two air chambers separated.

Description

1. Technical field [0001] The invention relates to a combustion method and device for burning anthracite, lean coal or other difficult-to-combustible fuels, in particular to a combustion method and device for a fly ash bottom-fed circulating fluidized bed for difficult-to-combustible fuels. 2. Background technology [0002] The dominant coal resources in my country's energy structure are very rich, but low-volatile anthracite and high-ash and high-sulfur low-quality coal occupy a considerable proportion and are widely distributed. Fully and rationally utilizing this part of coal resources will have significant economic benefits and social benefits. [0003] Circulating fluidized bed combustion has outstanding advantages such as high combustion intensity, good combustion stability, and wide fuel adaptability. It can use fuels with high ash, high moisture, and low calorific value, such as: coal gangue, oil shale, and other boilers that are difficult to burn. Anthracite with a ...

AI Technical Summary

Problems solved by technology

At the same time, due to the high position of the flashback point and the "attached wall" effect, the residence time of the flashback fly ash in the high-temperature zone of the furnace is relatively short, resulting in the use of anthracite or lean coal with poor combustion activity and small-capacity fluidization with a low furnace height. The fly ash at the tail of the bed boiler has a high content of combustibles, the efficiency of the boiler is low, and a lot of energy is wasted

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