Waste incineration waste heat boiler of circulating fluidized bed

Abstract

The invention discloses a waste incineration waste heat boiler of a circulating fluidized bed. A boiler body is composed of a hearth, a cyclone separator, a material return device, a tail flue and thelike. The heather is divided into three areas, a preheating and mixing area is arranged on the lower portion, a hearth combustion area is arranged in the middle, and the hearth heat exchange area isarranged on the upper portion. The water-cooled walls of a front wall and a rear wall of the lower portion of the hearth are arched outwards to form a high-heat-capacity insulation hearth combustion chamber. Fuel enters the hearth from the water-cooled wall of the front wall, circulating ash enters the hearth from the water-cooled wall of the rear wall, and three layers of structures which are arranged front and back and achieve regional air distribution are adopted by secondary air. By means of a system, the combustion condition in the boiler can be effectively controlled to be in a stable state, impacting brought by the high water content of the fuel, physical property changes and other self fluctuation is avoided, the flue gas temperature level and the oxygen content in the hearth are controlled, the effect of controlling combustion temperature is achieved, the combustion efficiency of the boiler is improved, and generation of dioxin and other harmful substances is reduced.

Description

technical field [0001] The invention relates to the field of circulating fluidized bed boilers, in particular to a circulating fluidized bed waste incineration waste heat boiler, which is applied to waste incineration and biomass power generation equipment. Background technique [0002] With the continuous and rapid development of society, people's living standards are gradually improving, and the amount of urban waste, industrial waste, and agricultural waste is also increasing. The disadvantages of traditional landfill treatment methods, such as large environmental pollution and low treatment efficiency, have become increasingly prominent and cannot adapt current development situation. In order to deal with garbage and other wastes, waste incineration boilers and biomass power generation boilers have been used on a large scale. However, the fuels used in these boilers generally have low calorific value and high water content, and are not easy to burn completely. The amo...

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Problems solved by technology

[0004] In order to overcome the problems of the traditional circulating fluidized bed boilers such as low furnace temperature and large fluctuations, insufficient combustion, and large amount of dioxins when burning garbage, the present invention provides a circulating fluidized bed waste incineration waste heat boiler, which can improve combustion efficiency. Temperature and stability, improve combustion efficiency, avoid the formation of dioxins

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