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Special circulating fluidized bed boiler with flue gas recirculation

A flue gas recirculation and circulating fluidized bed technology, which is applied in the field of circulating fluidized bed boilers and special circulating fluidized bed boilers, can solve the problems of high emission concentration of chemicals, easy wear of the heating surface, unstable bed temperature, etc., and achieve The effects of stable combustion, guaranteed reducing atmosphere, and effective bed temperature balance

Inactive Publication Date: 2015-03-25
SHANXI LANTIAN ENVIRONMENTAL PROTECTION EQUIPCO
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention aims to solve the unstable bed temperature, easy wear of the heating surface, slagging corrosion, NO X In order to solve the problem of high emission concentration of pollutants, a special circulating fluidized bed boiler with flue gas recirculation is provided

Method used

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  • Special circulating fluidized bed boiler with flue gas recirculation

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Embodiment Construction

[0024] Such as figure 1 A special circulating fluidized bed boiler with flue gas recirculation is shown, including a separator 2 communicated with the furnace 1, the top of the separator 2 communicates with three tail vertical flues, and the bottom of the separator 2 communicates with the boiler through the return plate 3 The furnace 1 is connected, and the end of the vertical flue is connected to the dust collector 8 and the induced draft fan 9 in turn, and the outlet of the induced draft fan 9 is connected to the bottom of the furnace 1 through the flue gas recirculation pipe 10 .

[0025] The separator 2 is an eccentric volute type high-efficiency fly ash circulation separator; in the first vertical flue of the three tail vertical flues, a water-cooled evaporator 4 and a superheater 5 are fixed from top to bottom, and in the second vertical flue A superheater 5 and an economizer 6 are fixed from bottom to top, and an economizer 6 and an air preheater 7 are fixed in the thir...

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Abstract

The invention discloses a special circulating fluidized bed boiler with flue gas recirculation, which belongs to the technical field of an industrial boiler, relates to a circulating fluidized boiler and solves the problems of the existing circulating fluidized bed boiler that the bed temperature is instable, the heated surface is easily worn, scaling and corrosion exist, NOX emission concentration is high. The special circulating fluidized bed boiler with flue gas recirculation comprises a separator communicated with a hearth, the top of the separator is communicated with three tail vertical flues, the bottom of the separator is communicated with the hearth through a return plate, the tail ends of the vertical flues are sequentially connected with a dust collector and an induced draft fan, and an outlet of the induced draft fan is communicated with the bottom of the hearth through a flue gas recirculation pipe. The balance of overall boiler temperature can be realized by adopting flue gas recirculation technology, the generation of NOX can be inhibited, the fuel adaptability is wide, and the combustion stability is high.

Description

technical field [0001] The invention belongs to the technical field of industrial boilers, and relates to a circulating fluidized bed boiler, in particular to a special circulating fluidized bed boiler with flue gas recirculation. Background technique [0002] Circulating fluidized bed boiler (CFB) is a high-efficiency, low-pollution and clean combustion technology that has developed rapidly in recent years. It has been widely used in power plant boilers, industrial boilers, and waste treatment and utilization. It has high combustion efficiency and strong adaptability to coal types. , Wide range of load adjustment, high efficiency and low pollution. However, the following problems are likely to arise during actual operation: [0003] (1) Unstable bed temperature: During the operation of the boiler, due to the physical characteristics of the fuel, air distribution, gas-solid ratio and other factors, the bed temperature is prone to instability such as too high or too low, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23C10/10F23C10/18F23J15/06
CPCF23C10/10F23C10/18F23C2201/00F23C2202/00F23J15/06
Inventor 王欢王民发郎凤娥郑旭娟郎鹏德
Owner SHANXI LANTIAN ENVIRONMENTAL PROTECTION EQUIPCO
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