Bell-jar funnel cap for fluidized bed

A fluidized bed and bell hood technology is applied in the field of structural design of air caps in air distribution devices, which can solve the problems of wear of air distribution holes, increased power consumption of fans, and increased power consumption of power plants, and achieves reduction of resistance coefficient, distribution of Even wind and less wear

Inactive Publication Date: 2006-12-13
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Ash dew phenomenon is more common in labyrinth and mushroom head hoods at low loads; traditional bell-type hoods have good performance in preventing ash leakage at low loads, but the power consumption of primary fans increases at high loads, and the power consumption of power plants The increase is relatively large, and when the load is running at low load, the continuous pressure pulsation in the bed makes some ash "saw" back and forth at the air distribution hole of the bell-type hood, and the air distribution hole is severely worn

Method used

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  • Bell-jar funnel cap for fluidized bed
  • Bell-jar funnel cap for fluidized bed
  • Bell-jar funnel cap for fluidized bed

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Embodiment Construction

[0015] The structure and principle of the present invention will be further explained below in conjunction with the drawings:

[0016] figure 1 The structure diagram of the improved bell-type hood provided by the present invention. The hood includes a vent pipe 4, an outer cover 1 arranged on the outside of the vent pipe, and air distribution holes 5 evenly arranged in the lower part of the outer cover, arranged inside the vent pipe The cone-shaped airflow channel 2 and the float 3 arranged in the cone-shaped airflow channel; the outside of the lower middle part of the ventilation pipe and the inner part of the lower part of the outer cover are connected by threads.

[0017] Before the boiler is started, the float falls on the lower part of the ventilation pipe under the action of gravity; as the primary air volume increases, the air flow starts to lift the float upwards and reaches a balance at a certain position. The air flow flows out from the gap between the float 3 and the v...

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Abstract

The invention relates to a bell cover wind cap used in fluid bed, belonging to the boiler wind distributor of cycle fluid bed. Wherein, it comprises a ventilate tube, an outer frame at the outer part of ventilate tube, wind distribute holes uniformly arranged at the lower part of outer frame, a taper air channel inside the ventilate tube, and a float inside the taper air channel. The invention can avoid pressure impulse caused by the foam breakage to cause ash leakage, when in low load; and in high load, its total resistance of wind cap and wind distribute plate will not increase along the load increase to reduce the generate efficiency.

Description

Technical field [0001] The invention relates to an air distribution device used in a fluidized bed boiler, in particular to the structural design of the air cap in the air distribution device. It is mainly used in circulating fluidized bed combustion boilers, but also in fluidized bed reactors in chemical industry and metallurgy. Background technique [0002] Circulating fluidized bed boilers have been widely used due to their combustion efficiency comparable to that of pulverized coal boilers, low-cost, high-efficiency desulfurization methods, and lower nitrogen oxide emissions. Its overall installed capacity and single-unit capacity have increased year by year. The air cap of the circulating fluidized bed boiler is an important part of the circulating fluidized bed boiler. It plays an important role in the uniform fluidization of materials in the circulating fluidized bed boiler bed and the uniform air distribution of the circulating fluidized bed boiler air distribution plate....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C10/18
Inventor 杨海瑞黄志民王启民
Owner TSINGHUA UNIV
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