CN201935179U

CN201935179U - Oil-free ignition device for circulating fluidized bed boiler

Info

Publication number: CN201935179U
Application number: CN2011200428177U
Authority: CN
Inventors: 张全胜
Original assignee: Individual
Current assignee: Individual
Priority date: 2011-02-21
Filing date: 2011-02-21
Publication date: 2011-08-17
Anticipated expiration: 2021-02-21

Abstract

The utility model discloses an oil-free ignition device for a circulating fluidized bed boiler, which comprises a boiler body and an ignition air duct which is arranged below the boiler body and is communicated with the inner chamber of the boiler body. The air inlet of the ignition air duct is connected with a near-boiler hot primary air source. An electric heating device is arranged in the ignition air duct and consists of a plurality of electric heating core tubes which are bundled together. The oil-free ignition device for the circulating fluidized bed boiler has the advantages that the electric heating device is arranged in the ignition air duct; near-boiler hot primary air is introduced to warm the boiler at the initial stage of the ignition of the boiler to heat bed materials laid at the bottom of the boiler body to 200 DEG C approximately, near-boiler steam is used for heating the boiler water of the boiler which is required to be ignited, when the bed materials are heated to 200 DEG C approximately, the bed materials are fed into the electric heating device to heat the near-boiler primary air to 500 DEG C approximately and therefore oil-free ignition can be realized; and 24000 kilowatt-hours of electricity are consumed for each time of ignition, the required electric charge is less than 20 percent of the expense of fuel oil which is used for ignition, the ignition expense is greatly reduced and the device can also realize the rapid cooling of the circulating fluidized bed boiler.

Description

The non-oil ignition device that is used for fluidized-bed combustion boiler

Technical field

The utility model relates to igniter, especially relates to a kind of non-oil ignition device that is used for fluidized-bed combustion boiler.

Background technology

China uses the maximum country of CFBB (CFB boiler) in power plant, the big or small recirculating fluidized bed station boiler that has moved has more than 3000, wherein the above large-size circulating fluidized bed station boiler of 410t/h has more than 140, and the above large circulating fluidized bed boiler of 1025t/h has more than 20.The body of heater bottom of the CFBB that power plant is used is provided with the starting ignition air channel, adopt grease gun igniting (realizing fluidized-bed combustion boiler cold start igniting): be about to be laid on the high-temperature flue gas that several cubes of the body of heater bottom or tens cubes of bed material utilize fuel oil to produce and be heated to (burning-point of coal) about 500 ℃ with fuel oil, when behind the temperature stabilization coal being thrown on the bed material, coal is promptly lighted; Whole ignition process oil gun flame does not contact with coal.Oil consumption of the igniting of the small-sized unit of CFB boiler (25MW and following) cold start-up at present needs 3 tons of left and right sides light diesel fuels approximately; (50-135MW) fuel consumption need about 6 tons medium-sized unit approximately, and fuel consumption of large-scale unit (200-300MW) can reach about 15 tons.By every 6 tons of oil consumption of the average cold conditions igniting of unit, annual igniting three times, 7000 yuan of calculating of light diesel fuel per ton, the annual igniting of national CFB boiler consumes 54000 tons of light diesel fuels approximately, is roughly equal to 37,800 ten thousand yuan of RMB, has increased the boiler operatiopn cost greatly.

Summary of the invention

The purpose of this utility model is to provide a kind of non-oil ignition device that is used for fluidized-bed combustion boiler, and this igniter can reduce igniting energy charge usefulness greatly, and the while can also be realized the quick cooling behind the boiler shutdown.

For achieving the above object, the utility model can be taked following technical proposals:

The non-oil ignition device that is used for fluidized-bed combustion boiler described in the utility model, the ignition air duct that comprises body of heater and be opened in body of heater below and body of heater intracavity inter-connection, the air inlet of described ignition air duct with face stove heat primary air source and link; Be provided with electric calorifie installation in the described ignition air duct.

Described electric calorifie installation is boundling many electrical heating core pipes together.

Advantage of the present utility model is to be provided with in the ignition air duct electric calorifie installation.The introducing of ignition of the boiler initial stage is faced the stove heat primary air boiler is carried out radiator, the bed material that bottom of furnace body can be laid is heated to about 200 ℃, can adopt simultaneously the stove water (i.e. bottom promotion) that faces the boiler that the stove Steam Heating need light a fire, when being heated to 200 ℃ of left and right sides, drops in the bed material this electric calorifie installation, this device can be heated to about 500 ℃ facing wind of stove, can realize non-oil ignition.Each igniting power consumption 24000 degree (10,000 yuans of electricity charge of less than) less than 20% of the required fuel cost of fuel ignition, greatly reduce the igniting expense, the energy conservation and consumption reduction effects highly significant, and the utility model can also be realized the quick cooling of fluidized-bed combustion boiler simultaneously.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Fig. 2 is that Figure 1A-A is to enlarged drawing.

The specific embodiment

As shown in Figure 1, 2, the non-oil ignition device that is used for fluidized-bed combustion boiler described in the utility model, the ignition air duct 2 that comprises body of heater 1 and be opened in body of heater 1 below and body of heater intracavity inter-connection, the air inlet of ignition air duct 2 with face stove heat primary air source and link; Be provided with electric calorifie installation in ignition air duct 2, this electric calorifie installation is boundling many electrical heating core pipes 3 together.

At first the particle diameter of the bed material 4 of bottom of furnace body laying will be controlled at below the 4mm; The stove heat primary air that faces that the igniting initial stage is introduced normal operation carries out radiator to the CFB boiler of needs igniting, when bed material 4 is heated to 200 ℃ of left and right sides, the stove water of the boiler that the stove Steam Heating need light a fire is faced in employing, start electric calorifie installation simultaneously, heat facing the stove heat primary air, making bed material 4 reach the coal burning-point can realize non-oil ignition (the heat primary air amount of facing stove is controlled at and keeps the bed material to be in the Micro Fluid state, temperature increase along with a wind behind the electric heating, consider thermal expansion, should suitably reduce the heat primary air amount of facing stove, it is constant to keep volume flow).

Because it is the natural cooling means that stops all fan operations, bars up all fire doors that conventional CFB boiler is shut down cooling, temperature is still greater than 50 ℃ in the stove after as a child when 24, and the maintainer can't enter and carry out service work in the burner hearth, has prolonged furnace outage time; If a wind that uses the electric calorifie installation heating to face stove after blowing out cools off fast to the bed material; then only needed 6-8 hours bed can be expected that temperature drops to below 50 ℃; the maintenance personal can enter and carry out work in the burner hearth; concrete grammar is: the heat primary air temperature that adopts electric calorifie installation control to face stove is lower than 50--100 ℃ of bed material temperature; air-introduced machine is kept minimum air quantity operation and is kept the furnace outlet pressure-fired; at any time adjust the heat primary air temperature with implantation material decrease of temperature; make bed material decrease of temperature speed be controlled at 100 ℃/h; realize the quick cooling of CFB boiler, shortened the time of shutting down maintenance.

Claims

1. non-oil ignition device that is used for fluidized-bed combustion boiler, the ignition air duct (2) that comprises body of heater (1) and be opened in body of heater (1) below and body of heater intracavity inter-connection, the air inlet of described ignition air duct (2) with face stove heat primary air source and link; It is characterized in that: described ignition air duct is provided with electric calorifie installation in (2).

2. the non-oil ignition device that is used for fluidized-bed combustion boiler according to claim 1 is characterized in that: described electric calorifie installation is boundling many electrical heating core pipes (3) together.