CN88103229A - Boiler with push plate coal feeder and two layers of furnace - Google Patents

Abstract

Boiler with push plate coal feeder and two layers of furnace belongs to and uses solid-fuelled fire bed type boiler.The rushing board mechanism directional push coal seam that moves reciprocatingly is studding with preheating on the upper grate of high-temperature resistant ceramic hearth plate, reverse burning, after-flame.The coal that leaks down continues after-flame on lower furnace grate with shaking and turning plate.Lime-ash is discharged out of the furnace by the spiral soot blower.The waste heat preheated air of lime-ash, the improved effect fired state that pokes fire of push pedal.The present invention is suitable for medium small boiler.It is good that it has a smoke medicining dust-removing effect, and mechanization is raised coal dedusting, sufficient combustion, is suitable for firing the advantage that colm, water cooling tube are not frayed, the lime-ash carbon containing is low.

Description

Boiler with push plate coal feeder and two layers of furnace belongs to and uses solid-fuelled fire bed type boiler.

Double-grate boiler is handwarmer now.Upper and lower two-layer fire grate is arranged in the stove.Upper grate is a water-cooled grate, and lower floor's fire grate is a fixed grate.The above space of upper grate is an ipper air chamber, and the following space of lower floor's fire grate is an ashcan, is the combustion chamber between the two-layer fire grate.Front wall is provided with the upper, middle and lower fire door, and the combustion chamber is provided with the side smokestack.Coal is added on the upper grate, because the coal seam plays filtration, dust can not taken away.During normal combustion, the smoke abatement and dust control index is lower than national standard.Negative-pressure firing can not produce coal gas and escape.The coal that upper grate is established after-flame is fallen on lower floor's fire grate and is burnt away, and the abundant after-flame energy-saving effect of fuel is remarkable.Meanwhile, this boiler still exists and does not realize that mechanization advances the coal ash disposal; Because the coal slagging-off has periodically, the uniformity of exerting oneself can not continue; Upper strata water-cooled grate serious wear; Shortcomings such as upper grate coal seam ignition condition is bad.Above-mentioned double-grate boiler can be with reference to " Industrial Boiler and safe operation thereof ", and Li is faithful and upright to compile Heilungkiang science tech publishing house,, Harbin City, 100 pages to 101 pages in 1986.

The purpose of this invention is to provide a kind of push pedal and raise the double-grate boiler of coal, advance coal in order to solve mechanization, smooth combustion, mechanical ashing, the protection water-cooled grate tube is not frayed and preheated air makes the coal seam improve ignition condition.

The object of the present invention is achieved like this: combustion apparatus is made of upper grate and lower floor's fire grate.Upper grate is air compartment with top, is cinder chamber below lower floor's fire grate, is the combustion chamber between the two-layer fire grate.Upper grate is to inlay refractory stove plate to constitute fire grate on water cooling tube.Lower floor's fire grate is to shake fire grate, or dump grate.Coal-fired feeding relies on the reciprocating motion of push pedal that coal is advanced from coal bunker on the upper grate, and coal is pushed and advances through preheating section, main combustion section, after-flame section, pushes cinder chamber at last.The coal that falls from the fire grate crack burns away at lower floor's fire grate.Lime-ash is by shaking or turnover panel falls into cinder chamber and continues after-flame.Mucking machine transports lime-ash outside the stove.Coal-fired required air enters from slag notch, goes into air compartment through the lime-ash preheating is laggard, and the air quantity that air compartment has dividing plate to reconcile each section is supplied with.The reverse burning in coal seam on the upper grate, the flue gas in the combustion chamber enters secondary furnace through outlet flue.The flue gas of after-flame enters flue, and convection bank is arranged in the flue, and the centre is provided with partition wall to increase the flue gas distance.Convection bank and upper drum and lower drum link.But small-sized stove gravity-flow ventilation forces exhaust ventilation than the cauldron employing.

The present invention has compared following progress with existing double-grate boiler: 1, the push pedal feeding has realized that mechanization raises coal; 2, air preheat, push pedal poke fire, ignition condition has been improved in the preheating section preheating in the coal seam; 3, be provided with the fire grate of inlaying refractory, solved the wear problem of water cooling tube, and heat accumulation own be big, helps the coal seam preheated burning; 4, lower floor's fire grate is to shake or the dump grate ash of realizing falling automatically; 5, air is entered by the lime-ash outlet, absorbs waste heat and improves air themperature.Such boiler is in operation and both kept smoke elimination, dedusting, energy-conservation advantage, reached the result that mechanization is raised coal ash disposal, flameholding, raised the efficiency again.

It is as follows below in conjunction with accompanying drawing in detail embodiment to be described in detail, and Fig. 1 is the combustion apparatus cutaway view of this boiler.Fig. 2 is the cutaway view that pan-furnace be arranged in parallel.Fig. 3 is the local cutaway view that amplifies of upper grate.Fig. 4 is a stove and pot cutaway view that the front and back serial is provided with.1 coal bunker is the container with the splendid attire coal of welded steel plate among the figure, the inlet of its oriented in-furnace coal feeding in bottom.2 motor-operated reciprocating mechanisms are installed in coal feed point place at the bottom of the coal bunker.Reciprocator drags 11 push rods and moves reciprocatingly.11 push rods drive 12 push pedals when advancing and vertically push away the coal seam forward.Coal is shifted onto on the upper grate face from the coal feed point of coal bunker bottom.Push pedal was lifted and is not contacted the coal seam when push rod returned.Reciprocation cycle just can make the coal seam do batch (-type) on the upper grate face to advance like this.The push pedal effect that pokes fire in addition when pushing away coal and advancing destroys coking and increases circulation of air, improves fired state.Because fugitive constituent is overflowed in the coal, burning and the coal seam is reduced gradually so the promotion cross section of push pedal should be advanced by coal and reduce successively on the direction, has breach and is the rake teeth shape at last.This shape more helps the promotion after-flame that pokes fire, and the adaptability of coal will be better.Inlay resistant to elevated temperatures 14 ceramics furnace plates above the 13 water-cooled boiler tubes and form upper grate.14 fire grate plates are the platy structures in crack with holes.The space of preheating section stove plate is less, and main combustion section space is bigger, and surplus combustion section space is moderate.The lime-ash of after-flame is released by push pedal and is concentrated at 19 and turn on the slag plate, turns over slag plate and stirs when slag relies on to conduct oneself with dignity to make more for a long time, and lime-ash turns over to be fallen in the cinder chamber.The 18th, support the support that turns over slag plate.27 combustion chambers.22 to shake fire grate be lower floor's fire grate, and the coal that upper grate falls burns away.Shake crank 6 22 fire grates are flipped an angle, lime-ash turns over to be fallen in 23 cinder chamber.The 24th, dividing plate that can rotational angle, it plays a part to reconcile lower floor's fire grate intake and turns over lime-ash.Lime-ash is taken out of it outside stove by 25 spiral-type slag eliminators.The water-cooled boiler tube links with 8 upper collecting chambers and 21 next part casees respectively.Air is entered air compartment by the heating of lime-ash waste heat from slag notch when 25 slag removers enter 17 air channels.Air compartment internal partition the 10, the 16th is reconciled the valve that each section air quantity distributes.15 dividing plates are fixed.Flue gas in 27 combustion chambers enters 31 secondary furnaces through 26 outlet flues.The flue gas of after-flame enters flue by flue entrance 34.In flue, be provided with 32 heat-exchanging tube bundles.It is connected with 37 lower drums with 33 upper drums.In order to increase the flue gas backhaul, interbank partition wall should be set.3 furnace linings among the figure.4 heat-insulation layers.5 combustion chamber stove doorways.The decelerator of 7 driven by motor.The 20th, partition wall.The 28th, the collection slag bank.

Claims (6)

1, a kind of fire bed type boiler that is used for buring solid fuel--boiler with push plate coal feeder and two layers of furnace is made up of upper strata water-cooled grate, lower floor's fire grate and drum tube bank, and it is characterised in that the push pedal mechanical orientation that moves reciprocatingly promotes the coal seam and upwards advances at upper grate.

2, boiler with push plate coal feeder and two layers of furnace as claimed in claim 1 is characterized in that upper grate is to inlay high-temperature resistant ceramic hearth plate to constitute on water cooling tube.

3, boiler with push plate coal feeder and two layers of furnace as claimed in claim 1 is characterized in that lower floor's fire grate is to shake or the turnover panel fire grate.

4, boiler with push plate coal feeder and two layers of furnace as claimed in claim 1 is characterized in that the lime-ash waste heat goes into air compartment with air heat is laggard.

5, push plate coal feeder and two layers of furnace as claimed in claim 1 is characterized in that machinery goes out lime-ash.

6, push plate coal feeder and two layers of furnace as claimed in claim 1 is characterized in that by the cross section of push pedal on the direction of advance of upper grate gradually little.

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