Automatic backing material feeding system of circulating fluidized bed boiler

Abstract

The invention discloses an automatic backing material feeding system of a circulating fluidized bed boiler. The automatic backing material feeding system comprises an spiral screw conveyor and a feeding bin, wherein the spiral screw conveyor is obliquely arranged, a feeding port is formed in the bottom of the spiral screw conveyor, a discharging port is formed in the top of the spiral screw conveyor, a first discharging channel is connected to the discharging port position, a grinding roller is arranged in the first discharging channel, the bottom of the first discharging channel is provided with a material falling port, the material falling port communicates with the top of the feeding bin, the upper portion of the feeding bin is connected to a motor, the power output end of the motor is arranged in the feeding bin and connected to a mateirla falling screw, the bottom of the feeding bin communicates with a second discharging channel, and the other end of the second discharging channel communicates with a feeding port of the circulating fluidized bed boiler. According to the automatic backing material feeding system, compared with the prior art, the feeding system has the advantages that feeding can be simply and effectively controlled, feeding is more uniform, and the feeding speed can be more effectively controlled.

Description

technical field [0001] The invention relates to the technical field of boiler feeding, in particular to an automatic bottom feeding system for a circulating fluidized bed boiler. Background technique [0002] Circulating fluidized bed combustion technology is a clean coal combustion technology developed in recent years. It has wide fuel adaptability, high combustion efficiency, low nitrogen oxide emissions, low-cost limestone furnace desulfurization, large load regulation ratio and load regulation Quickly wait for the outstanding advantages [0003] At present, in the long-term continuous operation of circulating fluidized bed boilers, since the fuel coal feeding equipment used in current circulating fluidized bed boilers is often traditional conveying pipelines, conveying chains, etc. The fuel coal particle size stability in the fluidized bed boiler is insufficient, and the mixing ratio of the new supplementary fuel coal entering the circulating fluidized bed boiler chambe...

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Problems solved by technology

[0003] At present, in the long-term continuous operation of circulating fluidized bed boilers, since the fuel coal feeding equipment used in current circulating fluidized bed boilers is often traditional conveying pipelines, conveying chains, etc. The fuel coal particle size stability in the fluidized bed boiler is insufficient, and the mixing ratio of the new supplementary fuel coal entering the circulating fluidized bed boiler chamber and the combustion air ratio is poor, resulting in relatively low combustion efficiency of the fuel coal in the furnace chamber. Low and poor stability, which leads to serious waste of fuel coal on the one hand, and serious friction loss and adhesion corrosion on the furnace surface by fuel coal particles and combustion residues on the other hand, which seriously affects the current circulating fluidized bed. The stability and reliability of the long-term operation of the boiler also increases the operating and maintenance costs of the circulating fluidized bed boiler

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