Fly ash recycling energy-saving equipment for circulating fluidized bed boiler

Abstract

The invention relates to fly ash recycling energy-saving equipment for a circulating fluidized bed boiler and belongs to the technical field of circulating fluidized bed boilers. The fly ash recycling energy-saving equipment comprises a hearth and a deduster ash bucket and further comprises an ash storage bin. An inlet of the ash storage bin is connected with the deduster ash bucket through a first ash conveying pipeline. An outlet of the ash storage bin is connected with the hearth through a second ash conveying pipeline. A deduster is arranged at the upper end of the ash storage bin. A back-flushing valve is arranged at the lower end of the ash storage bin. A material level indicator is arranged on the side wall of the ash storage bin. An ash inlet valve and an ash conveying pipeline electronically-operated gate are arranged on the first ash conveying pipeline. A variable-frequency feeder is arranged on the second ash conveying pipeline and connected with a fan. The portion, close to the hearth, on the second ash conveying pipeline communicates with a secondary air hose. The portion, between the secondary air hose and the variable-frequency feeder, of the second ash conveying pipeline is provided with a valve. The material level indicator, the ash inlet valve, the ash conveying pipeline electronically-operated gate, the variable-frequency feeder, the fan and the valve are connected with a DCS control cabinet. The fly ash recycling energy-saving equipment solves the problem of discontinuous ash return and the problem of fly ash combustion supporting.

Description

technical field [0001] The invention relates to a circulating fluidized bed boiler fly ash recirculation energy-saving equipment, which belongs to the technical field of circulating fluidized bed boilers. Background technique [0002] A large amount of fly ash will be produced during the operation of the circulating fluidized bed boiler. The existing fly ash is collected by the ash hopper of the dust collector, and then the fly ash in the ash hopper of the dust collector is sent back to the furnace through the pipeline for combustion to ensure the continuous operation of the boiler. run. The existing structure is that the ash hopper of the dust collector is directly connected to the furnace through the pipeline. During the working process, there will be intermittent ash return, which cannot guarantee continuous combustion, which reduces the combustion efficiency. Moreover, the high carbon content of fly ash is the most common problem in circulating fluidized bed boilers. Th...

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Problems solved by technology

The existing structure is that the ash hopper of the dust collector is directly connected to the furnace through the pipeline. During the working process, there will be intermittent ash return, which cannot guarantee continuous combustion, which reduces the combustion efficiency. Moreover, the high carbon content of fly ash is the most common problem in circulating fluidized bed boilers. The problem that arises is that although the fly ash plays a combustion-supporting role, it cannot effectively increase the ash content, and has no effect on increasing the boiler cycle rate and load. On the contrary, it increases the wear and tear of the boiler.

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