Horizontal circulating fluidized bed boiler with bed material out circulation function

Abstract

The invention discloses a horizontal circulating fluidized bed boiler with a bed material out circulation function, belonging to low-ash content inferior fuel combustion equipment. The horizontal circulating fluidized bed boiler comprises a main combustion chamber, a subsidiary combustion chamber, a burn-out chamber, a separator, a screening device, a bed material returning device, a material storage device and a returning pipeline system. The returning pipeline system comprises a main combustion chamber returning pipe, a primary returning pipe and a secondary returning pipe; the screening device is arranged below a deslagging pipe; a material outlet of the screening device is connected with the bed material returning device; and the bed material returning device is separately connected with the main combustion chamber, a primary material returning box and a secondary material returning box through the returning pipes and the material storage device. According to the horizontal circulating fluidized bed boiler, slags of a hearth are screened, and proper bed materials are returned to the hearth, so that deslagging loss can be effectively reduced, and the combustion efficiency is improved; a step of bed material supplement during combustion of low-ash content fuels is omitted; and the horizontal circulating fluidized bed boiler is particularly applicable to a situation in which inferior coal, solid waste, sludge or biomass and other low-ash content fuels are combusted and a situation in which the bed materials need to be supplemented during operation of a boiler while qualified bed materials are not available.

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 belonging to low-ash and low-quality fuels such as low-quality coal, solid waste, sludge or biomass. Background technique [0002] Circulating fluidized bed boiler is an 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, simultaneous desulfurization, denitration and other pollution control operations in the furnace, and low NOx and SOx emissions, it has developed rapidly in the power market. Traditional vertical, single-stage circulating fluidized bed boilers have disadvantages such as the height of the furnace and the huge volume of the boiler island, which requires high plant construction. At the same time, the supporting steel fr...

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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