CN2463750Y - Composite combustion boiler - Google Patents

Abstract

The utility model relates to a composite combustion boiler, which comprises a boiler shell (1), a boiler liner (2), a trapezoidal grate (5), a smoke-isolating arch (4), an air volume regulator (13) and the like. It is characterized in that the furnace container is composed of a furnace container top (2-1), a straight cylinder body (2-2) and a reducing cylinder body (2-13), a smoke guide pipe (7) is fixed with the upper and lower pipe holes of the furnace container by fillet welding, a smoke isolating arch (4) separates the furnace container into a potential changing area and a combustion area, a trapezoidal fire grate composed of an upper and lower plane and an inclined plane is arranged below the smoke guide pipe, and an air volume regulator is arranged on a lower furnace door.

Description

Combined combustion boiler

Usually the air approach axis combustion system consistent with the coal combustion direction is called forward combustion, otherwise, the combustion system that the air approach axis is opposite with the coal combustion direction is called reverse burning, in same coal seam, there are forward combustion and reverse burning simultaneously, this combustion system is called compound combustion.The utility model is a kind of combined combustion boiler.

Present widely used vertical boiler mostly is stationary furnace grate furnace and double-deck furnace grate furnace, gravity-flow ventilation.The stationary furnace grate furnace: forward combustion is that air is through fire grate, ash bed gives the heat back to burning zone, help the burning in fire grate cooling and coal seam, along with gas fume after burning goes up gradually, oxygen content in the flue gas reduces gradually, volatile matter increases gradually, and the volatile matter under the situation of anoxic in the flue gas is decomposed into " carbon black ", forms " black smoke ".Coal seam thickness increases when adding new coal, and flowing resistance increases, the air that enters burner hearth reduce in the flue gas oxygen content still less, volatile matter decomposites more " carbon blacks " in the flue gas, forms denseer " black smoke ", has wasted fuel, pollute environment, seriously exceeded national requirements for environmental protection.The double-deck furnace grate furnace: its structure is upper and lower two fire grates, upper fire-grating is that water-cooled grate is made up of water cooling tube, reverse burning, coal adds upper fire-grating from upper furnace door, enters burning zone after the volatile matter that air is separated out from upper furnace door enters coal seam and coal mixes, volatile matter sufficient combustion in the flue gas, generally do not form " black smoke ", but the upper fire-grating area is little, fractional cold is big, ignition temperature is low, and the fire grate thermic load is low.Lower fire grating is a casting furnace grate, and the burning upper fire-grating leak down to come or discloses the unburnt coal that gets off, burning slowly, the fire grate thermic load is also low, therefore is difficult to satisfy the requirement of boiler output.The double-deck furnace grate furnace stove of calling is higher, the last coal of the fireman gas of requiring great effort very much, and labour intensity is big, and operation is difficulty also, if misoperation, the hole sky appears in upper fire-grating coal seam easily, making burning and eliminating smoke to worsen.Make the smooth combustion of double-deck furnace grate furnace guarantee to exert oneself to guarantee that simultaneously it is very difficult that fume emission reaches environmental requirement.In addition, upper fire-grating is a water cooling tube, and easy scaling often because of the overheated bulging blister pipe explosion accident of water cooling tube takes place scaling, brings hidden danger to safe operation of the boiler in the heat intensity senior executive.Because it is very difficult that the restriction of boiler structure is repaired, also be difficult to guarantee repairing quality.

The utility model purpose is to the user provides a kind of simple in structure, easy to operate, and sufficient combustion satisfies the boiler exert oneself and to meet national environmental protection, aspect requirement such as energy-conservation, safe.

For achieving the above object, fixedly carrying out some improvement on the grate furnace basis, its structure is made up of shell, flue, trapezoidal fire grate, blast regulator etc.Shell is formed by cylinder and ellipse head butt welding; Flue is by the straight cylinder body, reducing cylinder, the top butt welding of oval flue form, a circular hole is opened at flue top and end socket center respectively, flue is inserted in the shell, the interior fillet welding of circular hole that impact tube inserts end socket and flue top is connected, the U type get a foothold circle respectively with shell and the butt welding of flue cylindrical shell, shell and flue are linked to be an integral body.The arc that casts on the gusset that the reducing cylinder gives weldering with refractory concrete in flue is separated into two parts every the cigarette arch with the flue space, and top is the heat convection district, and the bottom is the furnace chamber combustion zone.Carbonated drink space lining between shell and flue is put several smoke pipes of vertically leading.Lead the smoke pipe two ends and curve a regular camber, insert the upper and lower two comb hole interior angle solid weldings of having held successfully on the flue reducing cylinder respectively and decide, combustion zone and heat transfer zone are communicated with formation flue gas circulation passage.Combustion grate is the trapezoidal fire grate of cast iron, and the coal seam is evenly reasonably ventilated everywhere.Lower furnace door is provided with blast regulator and enters the upper and lower two-part air capacity in coal seam with adjusting.

Adopt the boiler of this spline structure, encircle under the adiabatic radiation effects every cigarette at arc.Combustion temperature in hearth is higher, and it is fast that the coal seam fire burns, and flue gas is dispersed to around the burner hearth and is retracted to and leads the smoke pipe lower nozzle and draw, and flue gas is fully mixed, burning fully, discharged flue gas is approximate colourless.Trapezoidal fire grate make the coal seam air distribution rationally evenly and also the increase of coal seam thickness the air capacity that enters the coal seam is not had much influences.Blast regulator can be regulated according to combustion case and enter coal seam two parts air capacity up and down.Burner hearth is not arranged water cooling tube, significantly reduces the generation of boiler pipe explosion accident, and the lower furnace door height is suitable, and the last coal operation of fireman is comfortable.

Further describe below in conjunction with the utility model structure cut-away view and embodiment.

Accompanying drawing is the cut-away view of the utility model combined combustion boiler

Illustrating vertical combined combustion boiler is made up of every cigarette arch (4), blast regulator (13) etc. shell (1), flue (2), trapezoidal casting furnace grate (5), arc.Shell (1) is made of ellipse head (1-1) and cylinder (1-2) butt welding, flue (2) pushes up the reducing cylinder (2-3) that (2-1) straight cylinder body (2-2) and the butt welding of two S shape cylinders joint form by oval flue and is welded to form, S shape cylinder joint diameter transition place has a row respectively and leads the pore that the smoke pipe caliber is complementary, and leads smoke pipe (7) two ends and curves certain radian and insert respectively that fillet welding connects in the pore; Straight cylinder body (2-2) both sides have several combs hole, horizontal water tube (8) two ends are inserted this pore fillet welding respectively and fixed, and constitute convection heating surface; A pore that is complementary with the impact tube diameter is respectively opened at end socket (1-1) and (2-1) center, flue top.Flue is inserted in the shell, and the interior fillet welding of pore that impact tube (6) inserts end socket and flue top is connected to discharge flue gas; The U type is got a foothold, and butt welding is connected circle (3) with flue reducing cylinder (2-3) with shell cylinder (1-2) respectively, shell and flue are constituted an integral body, form the carbonated drink space between shell and the flue, the arc that is cast in by refractory concrete on the gusset that gives weldering on the flue reducing cylinder is divided into furnace combustion zone (12) and heat convection district (11) every cigarette arch (4) with the flue space.Open a upper furnace door (9) and a lower furnace door (10) on the same side shell, the flue, upper furnace door communicates with the heat convection district, uses for blowing out, deashing, inspection, and lower furnace door communicates with furnace combustion zone (12), is used for coal and ventilation.Open the vent window (13-1) of a fan shape on the lower furnace door, the fanning strip similar (13-2) to the vent window shape, by rivet (13-3) with the fanning strip riveting on fire door vent window top, rotate fanning strip and regulate the handle of vent window aperture size and the blast regulator (13) that the fixing hole (13-5) of fixed sectors plate in certain position constituted.Fire grate is that trapezoidal casting furnace grate (5) is made up of upper and lower plane and inclined-plane, is installed in apart from the position of leading smoke pipe (7) lower nozzle below 150～400mm.

When boiler used, coal was delivered on the fire grate from lower furnace door, and an air part enters burner hearth below fire grate, and a part enters burner hearth from the vent window on the lower furnace door.According to the burner hearth combustion case, rotatable fanning strip is regulated the aperture of vent window, controls the ratio of this two parts air capacity.The flue gas that produces is scattered in to shrink in leading the smoke pipe lower nozzle around the burner hearth again and is drawn out to the heat convection district, and by impact tube, smoke stack emission atmosphere, flue gas obtains fully mixed burning, and discharged flue gas is approximate colourless.

Claims (3)

1, a kind of combined combustion boiler is by cylinder shell and flue, trapezoidal casting furnace grate, and arc is every compositions such as cigarette arch, blast regulators.Flue is inserted in the shell, get a foothold circle with shell by impact tube and U type, it is boiler body that flue is welded to connect into an integral body, it is characterized in that flue (2) bottom is the reducing cylinder (2-3) that the butt welding of two S shape cylinder joints forms, it is fixed to lead the two comb hole interior angle solid weldings of having opened at smoke pipe (7) two ends elbow insertion reducing cylinder diameter transition place, cast on the gusset that the reducing cylinder gives weldering and the arc that forms is separated into heat convection district (11) and furnace combustion zone (12) every cigarette arch (4) with the flue space by refractory concrete, and make the flue gas of burner hearth burning generation be drawn out to the heat convection district from leading smoke pipe (7).

2, boiler according to claim 1, it is characterized in that opening on the lower furnace door (10) vent window (13-1) of a fan shape, the fanning strip (13-2) similar and big slightly to vent window (13-1) shape, rotated fanning strip and can regulate the handle (13-5) of vent window aperture size and the blast regulator (13) that the fixing hole (13-4) of fixed sectors plate in certain position constituted on the vent window upper position by rivet (13-3) riveting.

3, boiler according to claim 1 is characterized in that combustion apparatus is that trapezoidal casting furnace grate (5) is made up of upper and lower plane and inclined-plane, is installed in apart from leading 150～400mm position, smoke pipe (7) lower nozzle below.