CN202660520U - Low-smoke-dust double-layer counter-burning steam boiler - Google Patents

Abstract

The utility model discloses a low-smoke-dust double-layer counter-burning steam boiler. The low-smoke-dust double-layer counter-burning steam boiler comprises a single boiler drum, wherein the single boiler drum is longitudinally arranged; a water-cooling wall pipe is arranged on each of the two sides of a furnace chamber; the furnace chamber comprises a pre-combustion chamber and a combustion chamber; a fixed furnace grate is arranged at the bottom of the combustion chamber, and a water-cooling counter-burning furnace grate is arranged on the upper part of the combustion chamber; convection tube bundles are arranged below the back part of the boiler drum; and a plurality of smoke isolating walls are arranged among the convection tube bundles. The low-smoke-dust double-layer counter-burning steam boiler has the outstanding advantages of strong fuel adaptability, high thermal efficiency, high environmental protection performance, enough power, convenience for use and maintenance and the like.

Description

A kind of low flue dust double-layer inverse burning steam boiler

Technical field

The utility model relates to energy-saving steam boiler, especially relates to a kind of low flue dust double-layer inverse burning steam boiler.

Background technology

Boiler is the capital equipment of energy source and power supply in the industrial production, and boiler also is indispensable equipment in people's lives.Be accompanied by the development growth of China's manufacturing industry, China's boiler manufacturing industry has obtained significant progress, can produce the boiler of multiple different pressures grade and capacity, has become world today's boiler for producing and has used maximum countries.At present, the horizontal boiler that China produces is generally the shell boiler of water-fire pipe series, its shortcoming has: the one, and safety problem, commonplace tube-plate fracture or the problems such as leakage and shell bulge of existing of shell type horizontal externally fired boiler, though existing many boiler producer has adopted arch form tube sheet, threaded flue, can alleviate the generation of above-mentioned accident, but because forward and backward tube sheet still has larger thermal (temperature difference) stress, not from basic solution accident potential; The 2nd, economic and easy to operate problem, the fire tube boiler thermal efficiency is lower, owing to adopting the threaded flue of transversal flow in the pipe, fouling phenomenon is more serious, cause BTHE below 70%, moving per about two months needs deashing once, and deashing must blowing out be opened the front and back smoke box, carry out with specific purpose tool, cumbersome with respect to water-tube boiler.

Summary of the invention

The purpose of this utility model is: for the problem that prior art exists, provide that a kind of thermal efficiency is high, easy maintenance, safe and reliable low flue dust double-layer inverse burning steam boiler.

The technical solution of the utility model is: comprise single drum, header, water screen tube, convection bank, drum vertically arranges, burner hearth is in the lower front of drum, the burner hearth both sides are furnished with water screen tube, water screen tube upper end and drum welding, the lower end respectively with a left side, right header welding, burner hearth comprises precombustion chamber and combustion chamber two parts, combustion chamber bottom is fixed grate, and top is the water-cooled anti-burn grate, is furnished with convection bank below the drum rear portion, the multiple tracks brick baffle is set between the convection bank, tube bank upper end and drum welding, lower end and each header welding, front header both sides respectively have a down-comer to link to each other with drum, and the rear set box fairlead links to each other with drum.

The beneficial effects of the utility model are: 1, adopt the Double grate back burning structure, chamber design is become precombustion chamber and combustion chamber two parts, be conducive to the enhanced fuel burning, reduce fly ash combustible material and fly ash content; 2, the multiple tracks brick baffle is set, design multiple tracks brick baffle is turned back flue gas for 3 times between convection bank, be conducive to dedusting in stove, flue gas in exhumation process, utilize flue dust and brick baffle in the flue gas, with convection bank repeatedly wash away collision, when turning back, flue gas forms vortex herein, centrifugal force when utilizing the inertia force of flue gas and brick baffle, tube bank collision and forming vortex carries out dedusting, adopts this measure, and the boiler body initial dust-density emission is very low, be lower than national Specification, be conducive to environmental protection; 3, adopt the DI structure, convection heating surface adopts intensive convection bank, and the parallel baffled coefficient of heat transfer is high, and convection bank is staggered in arrangement, and is strong from deashing ability, is difficult for dust stratification, makes boiler have the higher thermal efficiency, and the boiler operatiopn expense is low; 4, energy savings, this boiler use III class bituminous coal, and the test thermal efficiency reaches 74.15%, exceeds nearly 4.15 percentage points than JB/T10094-2002 " Industrial Boiler general technical specifications ", is conducive to energy savings; Simultaneously owing to adopting double-layer inverse burning, to have saved upper coal, slagged tap, the power consumption such as fire grate, power savings is remarkable; And load adjustment is more convenient.The utlity model has fuel tolerance strong, the thermal efficiency is high, good environmental protection, the outstanding advantages such as foot, easy maintenance of exerting oneself.

Description of drawings

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

Figure labeling description: 1, fixed grate, 2, drum, 3, brick baffle, 4, upper furnace door, 5, lower furnace door, 6, anti-burn grate, 7, furnace wall, 8, flue, 9, rear set box, 10, deduster, 11, air-introduced machine, 12, chimney, 13, water screen tube, 14, tube bank, 15, front header.

The specific embodiment

Be that structural representation of the present utility model can be found out from Fig. 1, the utility model is comprised of critical pieces such as single drum 2, front header 15, rear set box 9, left and right sides header, water screen tube 13, convection banks 14, and single drum 2 is vertically arranged.This boiler adopts the Double grate back burning structure, burner hearth is in the lower front of drum 2, furnace wall 7 fronts, burner hearth is divided into precombustion chamber and combustion chamber two parts, rationalization's stove internal combustion, the bottom, combustion chamber is fixed grate 1, top is water-cooled anti-burn grate 6, be conducive to the enhanced fuel burning, reduce fly ash combustible material and fly ash content.Front header 15 both sides respectively have a down-comer to link to each other with drum 2, and rear set box 9 fairleads link to each other with drum 2.The burner hearth both sides are furnished with water screen tube 13,2 welding of water screen tube 13 upper ends and drum, the lower end respectively with left and right sides header welding.Be furnished with convection bank 14 below drum 2 rear portions, restrain 14 upper ends and drum 2 welding, lower end and header welding, compact conformation.Design multiple tracks brick baffle 3 is turned back flue gas for 3 times between the convection bank 14, is conducive to dedusting in stove.

During this type normal operation of boiler, coal is interrupted input from upper furnace door 4, fresh fuel in preheating, drying on the scorching hot bed of material of upper strata anti-burn grate 6, separate out fugitive constituent after, burning, the a large amount of fuel gas that produce and black smoke are when passing through scorching hot coal seam, a part is burnt, and the air that remaining part is come in along with upper furnace door 4 and lower furnace door 5 ploughs under that lower combustion chamber is counter burns.Lower combustion chamber is main chamber, and its boundary is oxygen and the exothermic main place of combustible generation chemical reaction between upper and lower layer grate.When the slag blanket of upper strata anti-burn grate begins to form, the anthracite of burning is along with volume-diminished or poke fire to be drained on lower floor's fixed grate by anti-burn grate gap, upper strata and burn away, the air that is sucked by lower shoot door produces thermal-flame by scorching hot coke layer active combustion, be mixed in the main chamber space with top-down fuel gas and black smoke and carry out the naked light burning, taken into full account combustion space, air capacity, thermic load during design.Therefore, can reach sufficient combustion, eliminate the ideal state of black smoke.The flue gas that produces after the burning enters convection bank 14 by burner hearth through the combustion chamber, enter economizer, cyclone dust collectors 10 by convection bank 14 through flue 8, is then taken out by air-introduced machine 11 and draws by chimney 12 discharged to atmosphere.

Claims (1)

1. one kind low flue dust double-layer inverse burning steam boiler, comprise single drum (2), header, water screen tube (13), tube bank (14), it is characterized in that: described drum (2) vertically arranges, burner hearth is in the lower front of drum (2), the burner hearth both sides are furnished with water screen tube (13), water screen tube (13) upper end and drum (2) welding, the lower end respectively with a left side, right header welding, burner hearth comprises precombustion chamber and combustion chamber two parts, the bottom, combustion chamber is fixed grate (1), water-cooled anti-burn grate (6) is arranged at top, be furnished with convection bank (14) below drum (2) rear portion, multiple tracks brick baffle (3) is set between the convection bank (14), tube bank (14) upper end and drum (2) welding, lower end and header welding, front header (15) both sides respectively have a down-comer to link to each other with drum (2), and rear set box (9) fairlead links to each other with drum (2).

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