CN2078416U - Low-load combustion stabilizer for fanned powder-grinding system of boiler using brown coal - Google Patents

Abstract

The utility model relates to a low-load combustion stabilizer for the fanned powder-grinding system of a boiler using the brown coal, which relates to the station boiler which can keep the stable combustion under the lower load operation when the brown coal is combusted. The utility model is characterized in that a swirl vane is adjustable; the off gas is collected and radially led out by a central gas collecting pipe, and is sent to the upper part of a furnace chamber. The opening of the gas collecting pipe forms a loudspeaker shape, and the high-concentration primary air frontward enters a burner along a pipeline. The whole device is arranged on the horizontal pipe segment of the inlet of the burner. The utility model is suitable for the fanned powder-grinding system of the boiler using the brown coal in different capacity of 35 to 610T/H. The combustion stabilization with the low load can reach 33% at the lowest. The fuel saving is particularly obvious, and meanwhile, the coal consumption can reduce about 1%. The installation and the manufacture are simple, and the maintenance is convenient.

Description

Low-load combustion stabilizer for fanned powder-grinding system of boiler using brown coal

When the utility model relates to power station boiler using brown coal burning brown coal, than a kind of device that still can keep smooth combustion under the underload.

The brown coal reserves of China are very abundant, and the generating of burning brown coal is a kind of inexorable trend that makes full use of the energy.Yet since brown coal moisture content height, the fugitive constituent height, and calorific value is low, has limited its use.Abroad, obtained certain experience, but analyzed its architectural feature using in the brown coal generatings following many time once, estimate its result of use,, certain distance is arranged still for more still keeping smooth combustion under the underload, particularly, use more to be subjected to limitation for the domestic brown coal coal of China.The purpose of this utility model is intended to solve fan mill and directly blows system's boiler more still can keep steady combustion on the underload when using brown coal.

Conclude the brown coal stabilizer of countries such as the Soviet Union, connection group Germany, German Democratic Republic, its architectural feature is: vertically be loaded on fan mill exit, its primary air is tangentially to draw to send into burner hearth, weary air-flow still advances vertically, the eddy flow vanes fixed can not be adjusted in the stabilizer, can realize that minimum steady combustion load is more than 50%.

China's Harbin Boiler Plant and Shenyang Heavy Machinery Plant once united the research of having carried out the weary gas separating device of inertia-type in 1986, do not break away from external way, did not also drop into practical application.

The utility model has been drawn foreign experience, in conjunction with the brown coal characteristics of eastern region, China Inner Mongol, has carried out following improvement, has obtained good effect, realizes that steady combustion minimum load drops to 33% and do not throw oil, still can keep flameholding.Architectural feature after the improvement is as follows: stabilizer is contained on the horizontal pipeline section of burner inlet, housing is a steel, the same ajutage of diameter, swirl vane balancedly is fixed on the hexagonal axis cone of middle part in it, constitute certain angle with axial section, its big I is adjusted according to needs, and its rear center's blast pipe mouth is made horn-like, vertical axial compiles 90 ° of curved cavitys of drawing behind the weary air-flow.Separation coal dust behind the eddy flow, the primary air of its high concentration still enter burner vertically, the weary air-flow of low concentration, and tracheae is converged at the remittance center, is drawn by elbow and delivers to upper furnace and burn.

The utility model realizes that the operation principle of steady combustion is as follows:

With the stove cigarette is the high moisture content brown coal gas powder stream of drying medium, along pipeline when advancing by the swirl vane reef it in, the bigger Pulverized Coal of quality is under centrifugal force and inertia force effect, rotational flow is advanced along the tube wall side, be high concentration gas powder stream powder containing quantity and can arrive 80-85%, and less Pulverized Coal and the gas of quality (comprises CO ₂And water vapour) by behind the eddy flow, still concentrate on the pipeline middle part, be low concentration gas powder stream, powder containing quantity is at 20-15%.The gas powder stream of high concentration is done a wind along former pipeline and is sent into burner, owing to contain a large amount of CO ₂Separated with the weary gas of water vapour, eddy flow afterburner outlet coal dust speed reduces, and flame kernel descends, and coal dust is inflammable, thus also be difficult for during underload flame-out, and low concentration contain a large amount of CO ₂With the weary air-flow of water vapour, then drawn and deliver to upper furnace by bypass, therefore under the furnace high-temperature baking, contained coal dust also can fully burn.

Structure section signal of the present utility model as figure.1 is adjustable swirl vane among the figure, and 2 is the stabilizer shell, and 3 are weary gas fairlead, and 4 is the vanes fixed hexagonal axis.The brown coal gas powder stream of carrying along pipeline is by swirl vane 1 reef it in, and the Pulverized Coal that quality is bigger is entered main burner with the high concentration state by centrifugal to the tube wall side, and the powder of little quality and CO ₂, water vapour, still concentrate on pipeline middle part behind the eddy flow, compile radially to draw by blast pipe 3 and be the low concentration state and deliver to upper furnace, thereby finish the weary gas of Pulverized Coal Concentration, deceleration and removal of separations, main burner, the flameholding under the realization low load condition.

The utility model is applicable to 35T/H, 75T/H, and 130T/H, 220T/H, on the power station boiler using brown coal of 410T/H and 670T/H and above straight blowing powder system, low-load combustion-stabilizing, fuel-economizing is remarkable.Directly blowing boiler using brown coal with 75T/H fan mill is example, band 33-50% load, and year saving fuel oil 3500-4000 ton closes ten thousand yuan of RMB 500-600.

When the utility model starts at a stove, also can play the fuel-economizing effect.75T/H is directly blown the boiler speech, but one-shot fuel-economizing 3-4 ton.

In addition, use the utility model,, still can reduce coal consumption about 1% because of coal dust can fully burn.

The utility model fabrication and installation are simple, and are cheap easy to maintenance.

Claims (1)

1. A kind of be loaded on fan mill directly blow on the powder system boiler using brown coal by the device shell, the smooth combustion apparatus that swirl vane and fairlead constitute, it is characterized in that the device shell is a steel, the same ajutage of diameter, swirl vane in it balancedly is fixed on the hexagonal axis cone of middle part, constitute certain angle with axial section, its size can be given adjustment according to needs, its rear center lacks the air-flow fairlead, and the mouth of pipe is horn-like, vertical axial, compile 90 ° of curved housings of radially drawing behind the weary air-flow, deliver to upper furnace, the high concentration primary air after the separation axially enters boiler-burner, and whole device is loaded on the horizontal pipeline section of burner inlet.