Pulverized coal medium-temperature circulating bed boiler

Abstract

The invention provides a pulverized coal medium-temperature quick bed boiler. A coal feeding tube is arranged in a dense-phase area of the boiler, upper and lower secondary air tubes are divided intotwo layers and are arranged on a front wall and a back wall of a transition area of the boiler in a hedging mode, the secondary air tubes and the coal feeding tube are inclined downwards at the angleof 40 to 60 degrees, a pulverized coal flow conveying pipeline is connected to the interiors of the secondary air tubes, the residual coal supply is directly connected to the coal feeding tube, secondary air enters from the secondary air tubes, coarse coal grains of 100 mum to 1000 mum are fed from a coal inlet of the circulating bed boiler, fine pulverized coal of 0 to 100 mum is sent to a hearthfrom a lower secondary air inlet, the pulverized coal can be sent to the middle of the hearth by virtue of the momentum of the secondary air, the pulverized coal is inclined downwards first and thenis driven upwards by primary air so as to form a W-shaped combustion mode, and the upper secondary air is used as over-fire air. According to the pulverized coal medium-temperature quick bed boiler, graded coal supply is adopted, so that the coal supply is effectively prevented from stacking on a bed; the pulverized coal is carried by the secondary air and can be conveyed to a central high-temperature area of the hearth to burn, so that the technical problem of conveying the fine pulverized coal to the circulating bed boiler is solved.

Description

technical field [0001] The invention relates to the technical field of energy and power, in particular to a pulverized coal medium temperature circulating bed boiler technology. Background technique [0002] Efficient and clean coal-fired power generation technology has always been the mainstream development trend in the field of energy and power. Circulating fluidized bed (CFB) technology, as one of the clean coal power generation technologies, has developed rapidly due to a series of advantages such as wide fuel adaptability, effective control of pollutant generation in the furnace, and large load adjustment range. Practice has proved that by controlling the gas-solid two-phase flow state in the circulating fluidized bed and desulfurizing the limestone in the furnace, the pollutants generated by the boiler can be effectively controlled. [0003] The particle size distribution of feed coal has an important influence on the gas-solid two-phase flow state and the formation o...

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Problems solved by technology

[0007] In view of the above situation, the technical problem to be solved by the present invention is: in the application process of the existing circulating fluidized bed technology, when the coal particles become coal powder, there is a common problem that the coal powder cannot be sent into the circulating fluidized bed boiler

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