Combined circulating fluid bed boiler

Abstract

A combined circulating fluidized-bed boiler is composed of combustion chamber, cyclone separator, throat, material return valve and air distributing plate, and features that said throat can divide the combustion chamber into several combustion chambers for intensifying the combustion of particles in combustion chamber.

Description

technical field [0001] The invention relates to a fluidized bed boiler structure, in particular to a combined circulating fluidized bed boiler structure, which belongs to the field of mechanical engineering. Background technique [0002] Existing typical circulating fluidized bed boilers, through literature search, found that the patent applied by the Institute of Engineering Thermophysics, Chinese Academy of Sciences, the patent application number is: 94115512, the patent name is: circulating fluidized bed combustion device, the patent includes primary air Inlet, fuel inlet, secondary tuyere, furnace, high temperature gas-solid separator, split regulator, heat exchanger, tail convection flue, medium and low temperature gas-solid separator. Among them, the main section of the furnace is usually arranged in a vertical wall manner. This circulating fluidized bed structure has the following defects: the concentration of particles along the height of the bed drops sharply, and ...

AI Technical Summary

Problems solved by technology

This circulating fluidized bed structure has the following defects: the particle concentration drops sharply along the height of the bed, and there is an obvious situation where the particle concentration in the lower part is too dense and the particles in the upper part are too thin, resulting in serious uneven heat transfer along the furnace height, and the upper part is heated The heat transfer utilization rate of the surface is low; most of the particles enter the cyclone separator through the furnace at one time, and the amount of reflux particles near the inner side wall of the furnace is small, and the heat transfer is weak; the falling distance of the side wall reflux particles is long, resulting in side wall particles The lower temperature also affects heat transfer, and even affects the normal combustion of particles in severe cases

In addition, the particles in the furnace are easy to agglomerate at the axis, affecting burnout and reducing combustion efficiency

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