Spiral plane water-cooling burner

Abstract

The utility model relates to a spiral plane water-cooling combustor which can be used for fuel gas premixed combustion. The device comprises a spiral coil pipe, a gas uniformizing plate, a gas inlet pipe, a central water pipe, a gas inlet channel and a mixed gas cavity, the central water pipe is sleeved with the gas inlet pipe, the gas inlet channel is formed between the outer wall of the central water pipe and the inner wall of the gas inlet pipe and communicated with the mixed gas cavity, and the gas uniformizing plate is arranged at the bottom of the mixed gas cavity. The gas uniformizing plate is located above the spiral coil pipe, the spiral coil pipe is communicated with the central water pipe, gas uniformizing holes are formed in the gas uniformizing plate, the spiral coil pipe is formed by coiling a finned pipe in a plane spiral shape, the finned pipe comprises a base pipe of an oval structure and fins, and the base pipe is provided with a gas uniformizing hole. The fins are formed by welding flat steel strips which are spirally and uniformly wound on the outer wall of the base tube, the fins are pressed to form flanging fins, and an airflow channel is formed between the flanging fins and the outer wall of the base tube.

Description

TECHNICAL FIELD

[0001] The utility model relates to a spiral plane water-cooled combustor which can be used for premixed gas combustion. BACKGROUND

[0002] Compared with the traditional combustion mode, the premixed combustion mode of natural gas has the characteristics of high combustion efficiency and low pollutant emission, and is increasingly popular. The water-cooled premixed combustor is one of many premixed combustors, and compared with other forms of premixed combustors, the water-cooled premixed combustor has the characteristics of stable combustion, high combustion efficiency, low nitrogen oxide emission and good safety.

[0003] At present, the water-cooled premixed combustors on the market mainly include light pipe type water-cooled combustors and circular finned tube type water-cooled combustors. However, the ignition area of these combustors is square or close to square, while the cross section of the furnace of many devices using the combustors (such as WNS type gas boilers) is circular, so the combustors with square ignition area are not well matched with these devices. Meanwhile, the light pipe type water-cooled combustor has a limited effective airflow passage length, and generally needs to additionally arrange a tube bundle on the flame side to prevent backfire and stabilize the flame, which is complex in structure and poor in safety; the circular finned tube type water-cooled combustor has low flame density and small output power per unit area, and is suitable for small devices. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at overcoming the above-mentioned deficiencies in the prior art, and provides a spiral plane water-cooled combustor which is reasonable in structural design. The spiral plane water-cooled combustor not only has the characteristics of high combustion efficiency and low nitrogen oxide emission of general premixed combustors, but also has better backfire prevention performance, higher flame density, and the ignition area of the spiral plane water-cooled combustor is circular, which can be matched with devices with circular furnaces.

[0005] The utility model adopts the technical scheme to solve the above-mentioned problems: the spiral plane water-cooled combustor has the structural characteristics that it comprises a spiral coil pipe, a gas distribution plate, an air inlet pipe, a central water pipe, an air inlet passage and a mixed gas cavity, the air inlet pipe is sleeved outside the central water pipe, and the air inlet passage is formed between the outer wall of the central water pipe and the inner wall of the air inlet pipe, the air inlet passage is communicated with the mixed gas cavity, the mixed gas cavity is provided with the gas distribution plate at the bottom, the gas distribution plate is located above the spiral coil pipe, the spiral coil pipe is communicated with the central water pipe, and the gas distribution plate is provided with gas distribution holes.

[0006] Further, the spiral coil pipe is formed by winding a finned tube in a plane spiral shape.

[0007] Further, the finned tube comprises an elliptical base pipe and fins, and the fins are uniformly wound on the outer wall of the base pipe in a spiral shape by welding a flat steel belt.

[0008] Further, the fin is pressed to form a folded edge fin, and an air flow channel is formed between the folded edge fin and the outer wall of the base pipe.

[0009] Further, the spiral type coil pipe is communicated with the center water pipe through a connecting elbow.

[0010] Further, the mixed gas cavity is composed of a large sealing plate, a small sealing plate, a large end plate and an outer frame plate, the outer circle of the large sealing plate is arranged on the inner wall of the outer frame plate, the outer circle of the uniform gas plate is arranged on the inner circle of the large sealing plate, the inner circle of the small sealing plate is arranged on the outer wall of the center water pipe, the inner circle of the uniform gas plate is arranged on the outer circle of the small sealing plate, the inner circle of the large end plate is arranged on the outer wall of the air inlet pipe, and the outer circle of the large end plate is arranged on the inner wall of the outer frame plate.

[0011] Further, the end of the center water pipe is provided with a small end plate.

[0012] Further, the center water pipe and the spiral type coil pipe, and the spiral type coil pipe and the outer frame plate are all provided with sealing fillers.

[0013] Further, the uniform gas plate is a circular ring-shaped steel plate, uniform gas holes are uniformly arranged on the uniform gas plate, and the centers of the uniform gas holes are aligned with the center line of the spiral type coil pipe.

[0014] Compared with the prior art, the utility model has the following advantages:

[0015] 1. The equivalent diameter of the air flow channel of the finned tube in the spiral type coil pipe is smaller than the quenching diameter of the flame, the length of the narrow gap channel is greater than the quenching length of the flame, compared with other forms of the same type of burner, the air flow channel is longer, and therefore the anti-backfire performance is better.

[0016] 2. The short axis of the finned tube in the spiral type coil pipe is smaller than the diameter of the corresponding circular tube, so that more finned tubes can be arranged on the same size, the number of finned tubes and air flow channels increases, the number and density of flames increase, so that greater power can be obtained on a unit area, and large-scale production is facilitated.

[0017] 3. The finned tube in the form of an oval folded edge can be conveniently wound into a spiral type coil pipe under the premise of good safety, high combustion efficiency and low emission, and is convenient to process and manufacture.

[0018] 4. The spiral type coil pipe is adopted, the flame area is similar to the shape of the spiral type coil pipe, is a circular area, and the outer shape of the outer frame plate is also circular, so that the device can be matched with a circular hearth. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is the cross-sectional structure schematic view of the spiral type planar water-cooled burner of the utility model embodiment.

[0020] Figure 2 is a top view structural schematic diagram of the spiral type plane water-cooled combustor of the embodiment of the present application.

[0021] Figure 3 is Figure 1 A-A cross-sectional structural schematic diagram in the.

[0022] Figure 4 is Figure 1 B-B cross-sectional structural schematic diagram in the.

[0023] Figure 5 is a cross-sectional schematic diagram of the multiple adjacent finned tubes (air flow direction diagram) of the embodiment of the present application.

[0024] In the figure: spiral type coil 1, sealing filler 2, small end plate 3, large sealing plate 4, air uniformizing plate 5, air inlet pipe 6, center water pipe 7, small sealing plate 8, large end plate 9, outer frame plate 10, air inlet passage 11, mixed gas cavity 12, connecting elbow 13, air flow passage 14, base pipe 15, folded edge fin 16, air uniformizing hole 17. DETAILED DESCRIPTION

[0025] The present application will be further described in detail below in conjunction with the accompanying drawings and through embodiments, and the following embodiments are an explanation of the present application and the present application is not limited to the following embodiments.

[0026] EMBODIMENT

[0027] Referring to Figures 1 to 5 , it is understood that the structures, proportions, sizes, etc. shown in the drawings attached to the present specification are merely used to cooperate with the content disclosed in the present specification, to be understood and read by those skilled in the art, and are not used to limit the limiting conditions that the present application can be implemented, and therefore do not have substantial technical significance, and any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present application can produce and the purposes that the present application can achieve, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" in the present specification are merely for the convenience of clear understanding and description, and are not used to limit the scope of the present application that can be implemented, and the change or adjustment of the relative relationship, without substantially changing the technical content, is also regarded as the scope of the present application that can be implemented.

[0028] The spiral plane water-cooled burner in the embodiment comprises a spiral coil 1, a uniform air plate 5, an air inlet pipe 6, a central water pipe 7, an air inlet channel 11 and a mixed gas cavity 12. The air inlet pipe 6 is sleeved outside the central water pipe 7, and the air inlet channel 11 is formed between the outer wall of the central water pipe 7 and the inner wall of the air inlet pipe 6. The air inlet channel 11 is communicated with the mixed gas cavity 12. The mixed gas cavity 12 is provided with the uniform air plate 5 at the bottom. The uniform air plate 5 is located above the spiral coil 1. The spiral coil 1 is communicated with the central water pipe 7 through a connecting elbow 13. The uniform air plate 5 is provided with uniform air holes 17.

[0029] The spiral coil 1 is formed by winding the finned tube in a plane spiral shape. The finned tube comprises an elliptical base pipe 15 and fins. The fins are uniformly wound on the outer wall of the base pipe 15 in a spiral shape by a flat steel strip and welded. The fins are pressed to form folded edge fins 16. The air flow channels 14 are formed between the folded edge fins 16 and the outer wall of the base pipe 15.

[0030] The mixed gas cavity 12 is composed of a large sealing plate 4, a small sealing plate 8, a large end plate 9 and an outer frame plate 10. The outer ring of the large sealing plate 4 is arranged on the inner wall of the outer frame plate 10. The outer ring of the uniform air plate 5 is arranged on the inner ring of the large sealing plate 4. The inner ring of the small sealing plate 8 is arranged on the outer wall of the central water pipe 7. The inner ring of the uniform air plate 5 is arranged on the outer ring of the small sealing plate 8. The inner ring of the large end plate 9 is arranged on the outer wall of the air inlet pipe 6. The outer ring of the large end plate 9 is arranged on the inner wall of the outer frame plate 10. The end of the central water pipe 7 is provided with a small end plate 3. The central water pipe 7 and the spiral coil 1, and the spiral coil 1 and the outer frame plate 10 are all provided with sealing fillers 2.

[0031] Specifically, the base pipe 15 of the finned tube is an elliptical tube. The fins are flat steel strips, which are uniformly wound on the outer side of the base pipe 15 in a spiral shape. The fins are perpendicular to the outer surface of the base pipe 15. The root of the fin and the base pipe 15 are welded into one body by laser welding. The fins on both sides of the long axis on the cross section of the base pipe 15 are processed by folding edges to form two folded edge fins 16 parallel to the long axis. The adjacent folded edge fins 16 and the base pipe 15 form narrow air flow channels 14.

[0032] The finned tube is wound into the spiral coil 1 according to the plane spiral line. Each coil of the finned tube is adjacent without gap. On the cross section of the spiral coil 1, the long axes of the finned tubes are parallel to each other and perpendicular to the plane where the center line of the spiral coil 1 is located. The short axes of the finned tubes are on the same straight line and coincide with the plane where the center line of the spiral coil 1 is located.

[0033] The base pipe 15 of the outermost coil of the spiral coil 1 is reserved as a water inlet or a water outlet. The central water pipe 7 is arranged at the center of the spiral plane water-cooled burner. One end of the innermost coil of the spiral coil 1 is connected with the central water pipe 7 through the connecting elbow 13. The central water pipe 7 is used as a water outlet. The water inlet and the water outlet can be functionally interchanged according to actual needs.

[0034] The uniform gas plate 5 is a circular ring steel plate, which is provided with uniform gas holes 17. The center of the uniform gas holes 17 should be aligned with the center line of the spiral coil pipe 1. The outer diameter of the uniform gas plate 5 should be slightly larger than the inner diameter of the large sealing plate 4. The inner diameter of the uniform gas plate 5 should be slightly smaller than the outer diameter of the small sealing plate 8. The center of the uniform gas plate 5 is coincided with the center of the spiral coil pipe 1, and covers the large sealing plate 4 and the small sealing plate 8.

[0035] The air inlet pipe 6 is a circular straight pipe, the center line of which is coincided with the center line of the center water pipe 7. The outer diameter of the air inlet pipe 6 is larger than the outer diameter of the center water pipe 7. The air inlet pipe 6 is sleeved outside the center water pipe 7, and a jacket is formed between the air inlet pipe 6 and the center water pipe 7, which is the air inlet channel 11 of the mixed gas of the fuel gas and the air.

[0036] The center water pipe 7 is a circular pipe, which is arranged in the center of the spiral coil pipe 1 and is perpendicular to the plane where the center line of the spiral coil pipe 1 is located. One end of the center water pipe 7 is flush with one end of the fin tip in the long axis direction of the finned pipe. One end of the innermost coil of the spiral coil pipe 1 is connected with the center water pipe 7 through a connecting elbow 13.

[0037] The outer frame plate 10 is a circular cylinder, which tightly wraps the finned pipe of the outermost coil of the spiral coil pipe 1.

[0038] The sealing filler 2 is a high-temperature-resistant castable filler, which is used to fill the gap between the center water pipe and the spiral coil pipe 1, and the gap between the outer frame plate 10 and the spiral coil pipe 1, so as to prevent the airflow from flowing through these gaps.

[0039] The small end plate 3 is a circular flat steel plate, the center of which is coincided with the center of the spiral coil pipe 1, and tightly abuts against the fin tip of the spiral coil pipe 1 and is welded with one end of the center water pipe 7.

[0040] The large sealing plate 4 is a circular ring steel plate, the outer diameter of which is the same as the inner diameter of the outer frame plate 10. The inner diameter of the large sealing plate 4 is set to be at least capable of completely covering the gap between the outer frame plate 10 and the spiral coil pipe 1.

[0041] The small sealing plate 8 is a circular ring steel plate, the inner diameter of which is the same as the outer diameter of the center water pipe 7. The outer diameter of the small sealing plate 8 is set to be at least capable of completely covering the gap between the center water pipe 7 and the spiral coil pipe 1.

[0042] The large sealing plate 4, the small sealing plate 8 and the small end plate 3 are respectively arranged on both sides of the spiral coil pipe 1.

[0043] The large end plate 9 is a circular ring-shaped steel plate, which is used to connect the air inlet pipe 6 and the outer frame plate 10. The large end plate 9 is parallel to the plane where the center line of the spiral coil 1 is located, and is away from the plane where the center line of the spiral coil 1 is located by a certain distance. The large end plate 9 forms a space with the outer frame plate 10, the air uniformizing plate 5 and the large sealing plate 4 and the small sealing plate 8, which is the mixed gas cavity 12.

[0044] The cooling water enters from the straight section of the outermost coil of the spiral coil 1, and goes out from the center water pipe 7 after being heated. The inlet and outlet can be interchanged according to the needs.

[0045] The mixed gas of gas and air enters the mixed gas cavity 12 from the air inlet channel 11, is distributed by the air uniformizing plate 5, and then enters the spiral coil 1 uniformly from one end of the long axis of the finned tube, and is sprayed out from the other end of the long axis of the finned tube. After ignition, the flame area is similar to the shape of the spiral coil 1, which is a circular area.

[0046] The spiral coil 1 is wound by a single finned tube. According to actual needs, the spiral coil 1 can also be wound by two or more than two finned tubes symmetrically.

[0047] In addition, it should be noted that the specific embodiments described in the specification, the shape of the components, the name taken, etc. can be different. The above described in the specification is only an example of the structure of the utility model. Any equivalent changes or simple changes made according to the structure, features and principles described in the utility model patent concept are included in the protection scope of the utility model patent. The skilled in the art of the utility model can make various modifications or supplements or adopt similar ways to replace the described specific embodiments, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, which should belong to the protection scope of the utility model.

Claims

1. A spiral-shaped planar water-cooled burner, characterized in that: It includes a spiral coil (1), a gas equalization plate (5), an air inlet pipe (6), a central water pipe (7), an air inlet channel (11), and a mixing chamber (12). The air inlet pipe (6) is fitted outside the central water pipe (7), and an air inlet channel (11) is formed between the outer wall of the central water pipe (7) and the inner wall of the air inlet pipe (6). The air inlet channel (11) is connected to the mixing chamber (12). A gas equalization plate (5) is provided at the bottom of the mixing chamber (12). The gas equalization plate (5) is located above the spiral coil (1). The spiral coil (1) is connected to the central water pipe (7). A gas equalization hole (17) is provided on the gas equalization plate (5).

2. The spiral planar water-cooled burner according to claim 1, characterized in that: The spiral coil (1) is formed by spiraling finned tubes in a planar spiral shape.

3. The spiral planar water-cooled burner according to claim 2, characterized in that: The finned tube includes an elliptical base tube (15) and fins, wherein the fins are formed by welding flat steel strips spirally and uniformly wound around the outer wall of the base tube (15).

4. The spiral planar water-cooled burner according to claim 3, characterized in that: The fins are pressed to form folded fins (16), and an airflow channel (14) is formed between the folded fins (16) and the outer wall of the base tube (15).

5. The spiral planar water-cooled burner according to claim 1, characterized in that: The spiral coil (1) is connected to the central water pipe (7) via a connecting elbow (13).

6. The spiral planar water-cooled burner according to claim 1, characterized in that: The mixing chamber (12) is composed of a large sealing plate (4), a small sealing plate (8), a large end plate (9) and an outer frame plate (10). The outer ring of the large sealing plate (4) is set on the inner wall of the outer frame plate (10). The outer ring of the air equalization plate (5) is set on the inner ring of the large sealing plate (4). The inner ring of the small sealing plate (8) is set on the outer wall of the central water pipe (7). The inner ring of the air equalization plate (5) is set on the outer ring of the small sealing plate (8). The inner ring of the large end plate (9) is set on the outer wall of the air inlet pipe (6). The outer ring of the large end plate (9) is set on the inner wall of the outer frame plate (10).

7. The spiral planar water-cooled burner according to claim 1, characterized in that: The end of the central water pipe (7) is provided with a small end plate (3).

8. The spiral planar water-cooled burner according to claim 1, characterized in that: Sealing filler (2) is provided between the central water pipe (7) and the spiral coil (1), and between the spiral coil (1) and the outer frame plate (10).

9. The spiral planar water-cooled burner according to claim 1, characterized in that: The gas equalization plate (5) is a circular steel plate, and gas equalization holes (17) are evenly opened on the gas equalization plate (5). The center of the gas equalization hole (17) is aligned with the center line of the spiral coil (1).

Images