Device for preventing coal dust in gas-solid separator of boiler for circulating fluidized bed from coking

A technology of gas-solid separator and circulating fluidized bed, which is applied in the direction of fluidized bed combustion equipment, burning fuel in molten state, lighting and heating equipment, etc. Solid separator separation effect and other issues, to achieve the effect of safe and economical operation, high reliability of temperature regulation, and high reliability

CN101701707BInactive Publication Date: 2011-04-20WUXI HUAGUANG IND BOILER
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2011-04-20
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method for preventing coal dust in a gas-solid separator of a boiler for a circulating fluidized bed from coking. According to the design provided by the invention, a low-temperature medium communicating pipe is arranged at the inlet of the gas-solid separator, and the low-temperature medium is derived from the intermediate extracted steam of a steam turbine or the outlet exhaust gas of a boiler induced draft; an electric butterfly valve is additionally arranged on the communicating valve; and temperature measuring devices are arranged at the inlet, outlet and discharge hole of the gas-solid separator. When the coal dust keeps burning and the exhaust gas rises in the gas-solid separator, the coal dust in the gas-solid separator is coked and the discharge hole isblocked, in order to prevent the coal dust in the gas-solid separator from coking, the electric butterfly valve can be switched on by an actuating mechanism according to the preset temperature of a controller and the low-temperature medium can be mixed into the high-temperature exhaust gas to reduce the temperature of the high-temperature exhaust gas. By using a low-temperature medium to reduce the temperature of the exhaust gas in the gas-solid separator, the invention has the advantages of high temperature regulating speed and high temperature regulating reliability.
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Description

technical field

[0001] The invention relates to a method for preventing coking of coal dust in a gas-solid separator of a circulating fluidized bed boiler, which is used for cooling flue gas in the gas-solid separator of a circulating fluidized bed boiler. Background technique

[0002] Fluidized bed combustion is a clean coal-fired technology, and many of its unique advantages are beyond the reach of traditional boilers: the fuel has wide adaptability, and it can burn difficult-to-combustible coals and various low-calorific value, high-ash low-quality coals, as well as solid waste and other wastes; due to the multiple cycles of coal ash and fuel, it provides enough burnout time for the fuel, so that the carbon content of the fly ash is significantly reduced, so the combustion efficiency is high; the adjustment range of the boiler load is much larger than that of the pulverized coal furnace more; the combustion intensity of the boiler is high, and the ash and slag are easy to...

Examples

Embodiment Construction

[0013] Below the present invention will be further described in conjunction with the embodiment in the accompanying drawing:

[0014] like figure 1 , 2 , 3: the present invention consists of circulating fluidized bed boiler 1, horizontal flue 2, first thermocouple 3, third thermocouple 4, gas-solid separator outlet flue 5, gas-solid separator 6, boiler tail smoke Road 7, flue gas dust collector 8, induced draft fan 9, chimney 10, steam turbine 11, steam turbine intermediate extraction pipe 12, second thermocouple 13, feeder 14, electric butterfly valve 15, low temperature medium header 16, distribution pipe 17 , temperature controller 18.

[0015] The inlet of the horizontal flue 2 is connected to the outlet of the circulating fluidized bed boiler 1, and the outlet of the horizontal flue 2 is connected to the gas-solid separator 6; one end of the outlet flue 5 of the gas-solid separator is connected to the gas-solid separator 6, and the other One end is connected to the boi...