CN1079286A

CN1079286A - Combustion chamber for boiler double front and double rear grate-fired

Info

Publication number: CN1079286A
Application number: CN 92106940
Authority: CN
Inventors: 李昆龙
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-05-26
Filing date: 1992-05-26
Publication date: 1993-12-08

Abstract

A kind of combustion chamber for boiler double front and double rear grate-fired, the design is the combustion chamber that is applicable to less than the 6T grate firing boiler.Its main feature is to be provided with a face arch group and a rear arch group, and establishes a hogging between arch under front and back, forms four saturating burners, and the flue gas of combustion zone is guided into the bottom of a pan.According to different coals, can also utilize cover plate two saturating burner lidizations before and after the hogging, and arch growth down before making is applicable to burning of coal inferior.

Description

Combustion chamber for boiler double front and double rear grate-fired

The combustion apparatus that the present invention system uses solid fuel.

Evaporation capacity is that 1 ton/hour-4 tons/hour horizontal link chain boiler and reciprocal horizontal sliding boiler is present widely used miniature boiler, these two kinds of boilers all use solid fuel, and therefore parameters such as the volatile matter of the fuel that uses and burning-point are determining the efficient of boiler to a great extent.In the burner hearth of above-mentioned boiler, be provided with at present various multi-form ignite arch and front and back arches, to adapt to solid fuel with different parameters.It has been generally acknowledged that, when using low brown coal of the high burning-point of volatile matter and bituminous coal, adopt high and short front and back arch.Low when using volatile matter, rear arch that the appropriate to the occasion employing of the anthracite that burning-point is high is low and long and high and short face arch are given coal seam (boiler teaching and research room of Harbin Institute of Technology work " miniature boiler design and repacking ") to help in the burner hearth high-temperature flue gas radiation more heat.

Though above-mentioned have height and short face arch and low and boiler long rear arch has improved the temperature of furnace front, can utilize lower meager coal of volatilization or anthracite, still exist the low problem of efficiency of combustion but be lower than 10 anthracite for volatile matter, therefore use this boiler still can't make full use of anthracite resource.

At the problems referred to above, the applicant is once in the Chinese patent 85201639(applying date 85,4,22) a kind of chamber design of proposition with two face arch, this burner hearth by one group of preceding arch lower and long and one three folding shape by one before the face arch group formed of arch down, this face arch group form one independently the combustion zone with the temperature of raising burner hearth bottleneck throat.Adopt the design's the boiler anthracite of the high burning-point of low volatile that can burn, and can also obtain higher efficient.Through practice in the past few years, obtain extraordinary social effect and economic effect, but also exposed some shortcomings simultaneously, for example, be lower than 10% anthracite for volatile matter, its efficiency of combustion is on the low side.

At above shortcoming, the design has proposed a kind of more perfect design, and low rear arch combustion chamber can not make full use of the problem that volatile matter is lower than 10% colm to eliminate the two face arch of inclined and other short and high face arch and length.

The design mainly is two groups of arches before and after utilizing, and forms two saturating burners, makes that the high temperature between the arch and hogging and combustion layer enters the combustion zone with the increasing efficiency of combustion and the thermal efficiency from two saturating burners (being burner) under front and back.Opened two saturating burners between arch and hogging under these external front and back, the visual coal difference of this saturating burner is opened, partially opens, is closed and regulate combustion efficiency.If ature of coal is good, burning zone temperature height, the reduction reaction of pyrocarbon produces a large amount of CO, the content of middle part CO is the highest in whole burner hearth, in order to allow the imflammable gas in this part flue gas fully burn totally,, allow flue gas fling drum so can open two saturating burners (9), the flue gas that the front and back arch is come fully mixes, to improve combustion rate.

Details are as follows in conjunction with the accompanying drawings for the design, wherein:

Fig. 1 vertically arranges schematic diagram for two rear arch combustion chambers before two;

Fig. 2 is the A-A profile of Fig. 1;

Fig. 3 is the B-B profile of Fig. 1;

Fig. 4 is the C-C profile of Fig. 1.

As seen from Figure 1, in the deployment scenarios of the combustion chamber of horizontal feed chain furnace hogging group.Antetheca in the combustion chamber has a carbonated drink protector (1), and arch (2) before the front end of burner hearth has should be made up of one section askew arch and one section level arch as shown in the figure in preceding arch, and the horizontal angle α of this section askew arch ₁Be 0-85 °.Encircle down have one below preceding arch before (3), the floor projection length of encircleing down before this is 230-1500mm, horizontal angle α ₂Be 0-85 °.Establish a hogging (4) behind the arch down preceding, the projected length of hogging is 50-600mm, and the back of hogging (4) is established one group of rear arch again.This group rear arch divides back arch and back arch down, and the back projected length be located at after the hogging of arch (5) down is 100-500mm, and preceding arch (3) down and hogging (4) and hogging (4) with after under encircle between (5) burner (9) respectively arranged; Back arch (6) is formed the horizontal angle α of above-mentioned askew arch by one section level arch and one section askew arch ₃Be 0-85 °.The size that the available mobile cover plate (8) of above-mentioned burner (9) is regulated passage, the character of based on fuel or Close All, or all open, also can partly open.

From the above mentioned and as seen from Figure 1 the design has four combustion zones, (I) combustion zone is between preceding arch down and coal seam, a large amount of high-temperature flue gas regressive erosion coal seams, make that coal-fired waving analyzes, coking and burning, flue gas enters the burner hearth middle part with 1200-1500 ℃ temperature by saturating burner (7) then, enters the IV combustion zone.(II) combustion zone is between hogging and coal seam, and flue gas is gone out from saturating burner (9), and temperature can be up to 1250-1350 ℃, the bright IV combustion zone that enters dazzlingly.It between the rear arch group (III) combustion zone, be in the lime-ash after-flame stage, temperature is 900-1000 ℃, and it is bigger to contain the oxygen branch in the flue gas, reversible flow is (II) (IV) combustion zone delivery of supplemental oxygen branch, and the flue gas of (III) combustion zone can enter the bottom of a pan through saturating burner (10).The size that the available cover plates of the saturating burners in front and back (9) (8) of hogging part are regulated burner, when burning relatively poor anthracite or colm, can partly or entirely saturating burner (10) be covered, hogging and preceding arch are down linked together becomes long preceding arch down.

The design is the improvement to the defeated coal burning boiler combustion chamber of two face arch levels, but also can be used in the combustion chamber of cant furnace grate.

Claims

1, a kind of combustion chamber for boiler double front and double rear grate-fired of forming by two face arch, hogging and rear arch, of the present invention being characterized as, in the burner hearth of boiler, be provided with arch (5) under preceding arch (2) and preceding arch (3) down and back arch (6) and the back, and be provided with a hogging (4) between the arch (5) down at preceding down arch (3) and back, and the minimum point of encircleing under preceding is more than the 55mm apart from the short distance on the top layer of fuel fuel.

2, by the described combustion chamber of claim 1, the projected length of encircleing down before it is characterized in that is 230-1500mm, horizon elevation angle (α ₁) be 0-85 °, preceding arch is one section askew arch and one section broken line shape arch that level arch is formed, the horizontal angle (α of its leading portion askew arch ₂) be 0-85 °, the projected length of hogging is 50-600mm, the back arch is formed the horizontal angle (α of askew arch by short arch of a level and askew arch ₃) be 0-85 °, the back projected length of arch down is the 100-500 millimeter.

3, by the described combustion chamber of claim 1, before it is characterized by down between arch (3) and the carbonated drink protector (1) saturating burner (7) distance be the 100-750 millimeter, the saturating burner (10) between the back arch is encircleed down with the back is apart from being 50-600mm.

4,, it is characterized by on the breach that under preceding down arch afterbody and hogging and hogging and back, encircles the front portion and can add cover plate (8) by the described combustion chamber of claim 1.

5, by the described combustion chamber of claim 1, encircleing the anterior projected length that stretches into preceding arch afterbody before it is characterized in that down must be greater than 5mm, and the projected length of arch must be greater than 5mm after the afterbody of arch must stretch under the back.