A horizontal circulating fluidized bed boiler with external circulation of bed materials

Abstract

The utility model relates to a horizontal circulating fluidized bed boiler with external circulation of bed materials, which belongs to low-ash low-quality fuel combustion equipment. It includes main combustion chamber, auxiliary combustion chamber, burnout chamber, separator, screening device, bed material return device, material storage device and return pipeline system. The return pipeline system includes the return pipe of the main combustion chamber, the first-stage return pipe and the second-stage return pipe; the screening device is arranged under the slag discharge pipe, and the material outlet of the screening device is connected with the bed material return device, and the bed material return device passes through The return pipe and the material storage device are respectively connected with the main combustion chamber, the primary return box and the secondary return box. The present invention screens the furnace slag and returns suitable bed material to the furnace, which can effectively reduce the loss of slag discharge and improve the combustion efficiency; it can omit the link of supplementing the bed material when burning low-ash fuel, and is especially suitable for burning low-quality fuel In the case of coal, solid waste, sludge or biomass and other low-ash low-quality fuels, or when the boiler needs to supplement the bed material and lacks qualified bed material during operation.

Description

technical field [0001] The invention relates to a horizontal circulating fluidized bed boiler with external circulation of bed materials, in particular to a combustion equipment for low-ash low-quality fuels such as low-quality coal, solid waste, sludge or biomass. Background technique [0002] Circulating fluidized bed boiler is a highly efficient and clean boiler technology developed in recent years. It has wide fuel adaptability and can burn high-quality coal, low-quality coal, solid waste, biomass and other fuels. Because of its high combustion efficiency, it can simultaneously perform pollution control operations such as desulfurization and denitrification in the furnace, and has the advantages of low NOx and SOx emissions, so it has been rapidly developed in the power market. Traditional vertical, single-stage circulating fluidized bed boilers have disadvantages such as high furnace height and bulky boiler island, which have high requirements for plant construction. A...

AI Technical Summary

Problems solved by technology

Traditional vertical, single-stage circulating fluidized bed boilers have disadvantages such as furnace height and bulky boiler island, which have higher requirements for plant construction

At the same time, the supporting steel frame of the boiler island and the steel consumption of the boiler island body are relatively large, which makes the project cost and initial investment relatively high

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