Fluidized bed boiler external bed cyclone fluidization system

Abstract

The invention provides a cyclone fluidization system for an external bed of a fluidized bed boiler, which is suitable for an external bed of a fluidized bed boiler, comprising: an external bed of a fluidized bed boiler with an empty chamber inside; at least four high-temperature circulating particle feed pipes, High-temperature circulating particles are fed into the high-temperature circulating particle feed pipe; at least four first fluidization air pipes are arranged in the side wall of the external bed of the fluidized bed boiler, and communicate with the empty chamber and communicate with the high-temperature circulating particle feeding pipe, and enter The fluidizing wind of the first fluidizing air pipe carries the high-temperature circulating particles entering the high-temperature circulating particle feed pipe to form jets and inject them into the cavity, and each jet interacts to form a swirling flow; multiple second fluidizing air pipes are vertically connected At the bottom of the empty chamber, the fluidizing air entering the second fluidizing air pipe is sent into the empty chamber. The invention can make the high-temperature circulating particles form a horizontal cyclone and vertical fluidization in the cavity, thereby realizing sufficient heat exchange between the high-temperature circulating particles and the heating surface, and solving the problem of unreasonable arrangement of the fluidizing wind.

Description

technical field [0001] The invention relates to a fluidization system of an external bed of a fluidized bed boiler, in particular to a system in which the external bed of a fluidized bed boiler performs cyclone air distribution and fluidization on boiler circulating materials. Background technique [0002] Circulating fluidized bed boilers are increasingly widely used, mainly because they have many advantages such as low cost of controlling pollutant emissions, wide fuel adaptability, and large load adjustment range. With the continuous improvement of the capacity and parameters of the circulating fluidized bed boiler, the heat absorption share of the boiler heat exchanger has increased significantly, making it more difficult to arrange the heating surface in the furnace. Therefore, various forms of external beds are widely used in large fluidized bed boilers. The so-called external bed is a heat exchange device that moves a part of the heating surface in the boiler to the ...

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Problems solved by technology

[0005] The invention provides a cyclone fluidization system with an external bed of a fluidized bed boiler to solve the problems in the prior art of insufficient and uneven heat exchange between the high-temperature circulating particles in the external bed and the heating surface, and unreasonable arrangement of the fluidization wind

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