Bell-jar funnel cap for fluidized bed

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....

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

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