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

A technology of circulating fluidized bed and combustion device, which is applied in the direction of fluidized bed combustion equipment, combustion method, fuel burned in a molten state, etc., and can solve the problem of high combustible content, short residence time and low boiler efficiency when burning active fly ash and other problems, to achieve the effect of stable conveying, reduced leakage and uniform air distribution

Active Publication Date: 2004-09-15
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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

Examples

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Example Embodiment

[0032] Example 1 A method for burning refractory fuel using fly ash underfed circulating fluidized bed. A fly ash collector 1 such as an electrostatic precipitator is used to capture the fly ash with high combustible content in the flue gas, and the fly ash is The stand pipe 2 enters the return material controller 3, and then is sent to the return pipe by the conveying ejector 5, and then returned to the dense phase zone 41 in the bed by the high temperature resistant and wear resistant bottom feeding nozzle 9 to burn.

Example Embodiment

[0033]Embodiment 2 A combustion device used to implement the above method is composed of a fly ash collector 1, a return controller 3, a pneumatic conveying injector 5 and a combustion furnace 4. The upper part of the combustion furnace 4 and the fly ash collector 1 The fly ash collected by the fly ash collector 1 is connected to the inlet of the fly ash collector 1. After passing through the return controller 3, the pneumatic conveying ejector 5 sends it to the combustion furnace through the bottom feeding nozzle 9 on the air distribution plate of the combustion furnace 4. In the dense phase area 41 of the furnace 4, the material return controller 3 includes a shell 31. A bed body 311 and a wind chamber 312 are arranged in the shell 31. An air distribution plate 32 is arranged between the bed body 311 and the wind chamber 312. The chamber 312 is provided with an air inlet, and the bed body 311 is provided with a stand pipe 33 and a lower ash pipe 34. The stand pipe 33 extends int...

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Abstract

The invention provides a kind of fly ash bottom feeding circular fluidized-bed combustion method and the device, the method is: uses fly ash collector to collect the fly ash with high content in smoke, the fly ash are put into the back material controller through vertical pipe, then and they are carried to the return pipe through transmitting and ejector, and they are returned to the thick phase area of bed through bottom feeding spraying muzzle which is high temperature resisting and corrosion resisting. The device is: it is made up of fly ash collector, back material controller, gas transmitting ejector and the combustion furnace. The top of the combustion furnace connects with the inlet of fly ash collector, the fly ash through the fly ash collector outlet, are carried to the thick phase area of combustion furnace through the bottom feeding sprayer with gas transmitting ejector. The invention can enhance the combustion effect of the fly ash; it can save energy and protect the environment.

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 ...

Claims

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Application Information

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IPC IPC(8): F23C10/00F23C10/02
Inventor 金保升肖睿章名耀仲兆平兰计香
Owner SOUTHEAST UNIV
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