CN1059027C

CN1059027C - Wall adsorption jet smooth burning method and premix burner thereof

Info

Publication number: CN1059027C
Application number: CN 94107332
Authority: CN
Inventors: 黎军; 盛宏至; 吴承康
Original assignee: Institute of Mechanics of CAS
Current assignee: Institute of Mechanics of CAS
Priority date: 1994-07-04
Filing date: 1994-07-04
Publication date: 2000-11-29
Anticipated expiration: 2014-07-04
Also published as: CN1099469A

Abstract

The present invention belongs to a combustor for boilers and furnaces. The present invention uses a curved wall surface (2) for adsorbing fuel air jets, the curved wall surface (2) is composed of a convex curved line (3) and a concave curved line (4), and fuels in jets are concentrated in a high-temperature backflow region under the action of inertia and are heated and combusted rapidly in the jets. In addition, curved jets have a strong erosive function to the curved wall surface simultaneously, and the wall surface of the combustor can be effectively prevented from generating slag. The combustor has the characteristics of good flame stability, no slag, wide fuel adaptability, simple structure, no abrasion component and no need of high speed jets.

Description

Wall adsorption jet smooth burning method and precombustion chamber

The invention belongs to the burner of boiler, stove etc.

The aerodynamic principle that present similar technology adopted, the burner of design has, rotating jet high temperature recirculation zone type, Blunt wake high temperature recirculation zone type, multiple jet flow high temperature Jia Liu district type, wall-attached jet high temperature recirculation zone type.Above-described all kinds of burner, its shortcoming be, fuel that has and high temperature recirculation zone coupling are unreasonable, and resistance is big, swirl vane is easy to wear, the easy slagging scorification of combustion chamber wall surface, and the bluff body that has is easy to wear, what have needs high-speed jet, complex structure, and what also have needs control jet or the like.

The present invention and wall-attached jet high temperature recirculation zone type belong to wall-attached jet high temperature recirculation zone type together, but have utilized two kinds of attached wall forms of different jets.In hydrodynamics, there are two kinds of attached wall phenomenons of jet, the one, jet separates the attached wall of cavity type jet of attached wall more earlier, and another kind is the complete adherent attached wall of non-NULL alveolitoid jet, and the present invention is the attached wall of jet that has utilized the non-NULL alveolitoid.

Goal of the invention of the present invention is, overcomes above-mentioned shortcoming, and a kind of wall adsorption jet smooth burning method and precombustion chamber are provided.

Fig. 1 is a principle assumption diagram.

Fig. 2 is the side view of Fig. 1.

Fig. 3 is the principle assumption diagram of attached wall up and down.

Fig. 4 is the side view of Fig. 3.

Fig. 5 is the principle assumption diagram of square attached wall.

Fig. 6 is the side view of Fig. 5.

Fig. 7 is the principle assumption diagram of circular attached wall.

Fig. 8 is the side view of Fig. 7.

(1) is wind passage, (2) curved wall, (3) convex curves, (4) notching curve, (5) flex point among Fig. 1,2.

(1) is wind passage, (6) last wind passage, (7) upper and lower sides air port, (8) left and right sides air port among Fig. 3,4.

(9) are a wind square duct among Fig. 5,6.

(10) are a wind circular channel among Fig. 7,8.

Fig. 1 is the principle assumption diagram of wall adsorption jet smooth burning method of the present invention and precombustion chamber, is the step of expansion in the exit of a wind passage (a 1) side wherein, and opposite side is smooth curved surface, just curved wall (2).Curved wall (2) is divided into two sections, and one section is to go up convex line (3) and another section notching curve (4), and two sections curve tie points are flex point (5).Because jet and wall have mutual suction-operated, thereby jet is along a hydraulically smooth surface side flow of curved wall (2) just all the time during from the ejection of wind passage, do not exist one jet produce to be separated and the cavity of attached wall again, because of the direction of the attached wall of jet is determined, be adsorbed in a side of curved wall (2), so needn't set the direction of its attached wall with control jet, the case of bending of jet depends on the shape of curved wall (2), can the based on fuel condition, demanded power output and the on-the-spot locality condition of use are come the degree of crook of the interior jet of designed combustion device neatly, thereby realize various demanded fuels.With curved wall (2) adsorbed fuel air-spray, it is crooked mobile to make it form attached wall in chamber passage, the compact district that produces backflow and fuel particle or drop at opposite side.

Fig. 3,4 what provide is the burner that is made of two attached walls two wind passages, wherein curved wall (2) has been made up-down structure, the size of last wind channels designs is bigger than the size of a wind passage (1), its principle is, when fuel sprays, because of the reason of gravity has part, fuel is just more even when the combustion chamber like this, because this programme adopts is that the burner of two attached walls can more effectively prevent slagging scorification, wall adsorption jet precombustion chamber feature of the present invention also has the outer wall in precombustion chamber that upper and lower sides air port (7) and left and right sides air port (8) also are installed, it act as, when having increased up and down crosswind and left and right sides crosswind, can elongate the recirculating zone in the combustion chamber, just look the difference of fuel mass, the flux of crosswind and left and right sides crosswind reaches best steady combustion state about suitably regulating.Method with curved wall (2), precombustion chamber can also be made three-dimensional combustion chamber,, it is characterized in that as Fig. 5 and Fig. 7, said curved wall (2) can be made the flared horn wall structure of four outside flarings, maybe can do the flared horn wall structure of circular outside flaring.

Embodiment 1: shown in two wall-attachment Fig. 3,4, two wind passages (1), (6) are wherein arranged, last wind passage (6) is greater than a wind passage (1), exit at two wind passages, curved wall (2) is all arranged, ventilating opening (7) and left and right sides ventilating opening (8) up and down are installed at last lower wall surface and two sides.

Embodiment 2: three-dimensional wall-attachment as Fig. 5,6 and Fig. 7,8 shown in, wherein a wind passage (9) is the Back Word type, in the exit of a wind passage (9), curved wall (2) is arranged all.Also can do circular flared horn shape in addition, wherein a wind passage (10) is annular, in the exit of a wind passage (10), makes the curved wall (2) of toroidal.

The advantage of above-described wall adsorption jet precombustion chamber is, can protect wall, not slagging scorification, flame stabilization, reduction pollution, the fuel scope of application wide and simple in structure etc. effectively.

Claims

1. a wall adsorption jet smooth burning method is characterized in that, with curved wall (2) adsorbed fuel air-spray, it is crooked mobile to make it form attached wall in chamber passage, the compact district that produces backflow and fuel particle or drop at opposite side.

2. a wall adsorption jet smooth burning precombustion chamber is characterized in that, curved wall (2) is divided into two sections, and one section is to go up convex line (3) and another section valley line (4), and two sections curve tie points are flex point (5).

3. by the described precombustion chamber of claim 2, it is characterized in that said curved wall (2) can be made wall up-down structure or that only make down structure.

4. by claim 2 or 3 described precombustion chambers, it is characterized in that said curved wall (2) can be made the square horn mouth wall structure of four outside flarings.

5. by claim 2 or 3 described precombustion chambers, it is characterized in that said curved wall (2) can be done the horn mouth wall structure of circular outside flaring.

6. by the described precombustion chamber of claim 2, it is characterized in that, increased ventilating opening (7) and left and right sides ventilating opening (8) up and down at last lower wall surface and two sides.