Circulating fluidized bed boiler uses high temperature cyclone separator to blow off the tail heating surface device

Abstract

The invention relates to a device for blowing the tail heating surface of a circulating fluidized bed boiler by utilizing a high-temperature cyclone separator. The device is characterized by comprising an air preheater, a primary air outlet air duct, an air box, an expansion joint, an air pipe, a butterfly valve, a square opening spray pipe and the high-temperature cyclone separator, wherein the air pipe is arranged between the high-temperature cyclone separator and the air preheater; the outlet of the air preheater is provided with the primary air outlet air duct; the primary air outlet air duct is provided with the air box; the air pipe is communicated with the air box through the expansion joint, and the air pipe is provided with the butterfly valve; the high-temperature cyclone separator is connected with the air pipe through the square opening spray pipe. The device disclosed by the invention has the characteristics of simple structure, easiness for implementation, easiness for operation, no need of constant maintenance, small structural size, safety and reliability in property, high blowing energy, large effective blowing range, high speed, short time and thoroughness in as removal, is easily used for the position with small space size, is not only suitable for loose ash deposit, but also suitable for cohesive ash deposit, and retains no ash blowing dead angle.

Description

technical field [0001] The invention relates to a circulating fluidized bed boiler soot blowing device, in particular to a circulating fluidized bed boiler blowing tail heating surface device using a high-temperature cyclone separator. Background technique [0002] At present, my country is the country with the largest number of circulating fluidized bed boiler (CFB) generating units, the largest total installed capacity and the fastest development speed in the world. Circulating fluidized bed boiler (CFB) generator sets have been widely used in my country, and circulating fluidized bed (CFB) generator sets use circulating fluidized bed boilers as power generation power. In the prior art, the high-temperature cyclone separator of circulating fluidized bed boiler is one of the key components to ensure the reliable circulation of coal-fired solid particle materials in circulating fluidized bed boiler. It is arranged on the flue gas channel at the furnace outlet, and its workin...

AI Technical Summary

Problems solved by technology

The flue gas and fine particles not captured by the separator are discharged from the central tube, sent to the tail flue, continue to conduct convective heat exchange with the heating surface, and finally exit the boiler, a part of these fine particles not captured by the separator will adhere to On the heating surface of the tail, the heat exchange between the flue gas and the working medium is weakened, the resistance of the flue gas is increased, the temperature of the exhaust gas is raised, and the thermal efficiency of the boiler is reduced. Generally, two or more soot blowing devices are arranged on each stage of heating surface, especially for large-capacity boilers. Many stages are arranged on the rear heating surface, which requires a large number of soot blowing devices, thus reducing the economic benefits of circulating fluidized bed boilers

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