Air-cooled flat burner

Abstract

The utility model belongs to the technical field of combustor, especially point to a air -cooled flat -plate combustor, including the combustor tube that is cylindrical and upper end opening, be equipped with the mixed gas inlet pipe of connection mixer on the lateral wall of combustor tube, the upper end opening department of combustor tube is equipped with the corrugated board group, the thickness of corrugated board group is 20mm -60mm, be equipped with the air hole in the corrugated board group, and the aperture rate of corrugated board group is 20% -60%, be equipped with the support frame for supporting corrugated board group in the combustor tube, the support frame includes a plurality of coaxial support ring that sets up, two adjacent support rings are connected through connecting rod, the outermost circle support ring is fixedly installed on the inner lateral wall of combustor tube, the upper end of combustor tube bends inwards and forms the annular limit stop that carries out the upper limit of corrugated board group.The utility model can effectively improve unit heat load, and then improve the tonnage of boiler.

Description

Technical Field

[0001] This utility model belongs to the field of burner technology, and specifically refers to an air-cooled flat plate burner. Background Technology

[0002] With the release of the new national standard, the testing specifications for evaporator water volume have been clarified, and the water volume requirement for evaporators exempt from inspection is less than 30L. If the design normal water level volume of a steam evaporator reaches or exceeds 30 liters (V≥30L), and its rated steam pressure reaches or exceeds 0.1 MPa (P≥0.1MPa, gauge pressure), then such a steam evaporator falls under the regulatory scope of the "Special Equipment Safety Law" and must be subject to strict mandatory supervision. Therefore, the challenge of evaporators lies in how to increase the boiler tonnage within the 30L water capacity limit. Boiler tonnage refers to the amount of water that the boiler can heat into saturated steam per hour under rated parameters (pressure, temperature).

[0003] Most existing evaporators use cylindrical metal fiber burners to form a cylindrical combustion chamber. The cylindrical metal fiber burner has a large combustion area and requires a large furnace size. The water volume is difficult to control. In addition, the opening rate of the metal porous plate inside the metal fiber burner is less than 10%, resulting in a low unit heat load. Under the premise of 30L water capacity, the boiler tonnage is small. Utility Model Content

[0004] The purpose of this invention is to provide an air-cooled flat-plate burner that can effectively increase the unit heat load and thus increase the boiler tonnage.

[0005] This utility model is implemented as follows: An air-cooled flat-plate burner includes a cylindrical combustion chamber with an open top. A mixed gas inlet pipe connected to a mixer is provided on the side wall of the combustion chamber. A corrugated plate assembly is provided at the upper opening of the combustion chamber. The thickness of the corrugated plate assembly is 20mm-60mm, and an air outlet is provided within the corrugated plate assembly. The opening ratio of the corrugated plate assembly is 20%-60%. A support frame for supporting the corrugated plate assembly is provided inside the combustion chamber. The support frame includes multiple coaxially arranged support rings. Adjacent support rings are connected by a connecting rod. The outermost support ring is fixedly installed on the inner side wall of the combustion chamber. The upper end of the combustion chamber is bent inward to form an annular limiting plate that upper limits the corrugated plate assembly.

[0006] In the aforementioned air-cooled flat-plate burner, the outermost support ring is fixedly connected to the inner wall of the combustion cylinder by welding.

[0007] In the aforementioned air-cooled flat plate burner, the corrugated plate assembly includes multiple coaxially arranged annular plates, with a corrugated plate between two adjacent annular plates, and the air outlet is formed between the corrugated plate and the annular plate.

[0008] In the aforementioned air-cooled flat plate burner, the materials of the annular plate and the corrugated plate are 310S stainless steel or 304 stainless steel.

[0009] In the aforementioned air-cooled flat plate burner, the diameter of the air outlet is 0.5mm-1.2mm.

[0010] In the aforementioned air-cooled flat plate burner, the included angle α between the annular limiting plate and the combustion cylinder is 90°-160°.

[0011] In the aforementioned air-cooled flat plate burner, the combustion cylinder includes an upper cylinder with openings at the top and bottom, a lower cylinder with openings at the top and bottom, and a bottom plate covering the lower end of the lower cylinder. The corrugated plate assembly is disposed at the upper end of the upper cylinder, and the mixed gas inlet pipe is disposed on the side wall of the lower cylinder.

[0012] In the aforementioned air-cooled flat-plate burner, the mixed gas inlet pipe is fixed to the side wall of the lower cylinder by welding.

[0013] In the aforementioned air-cooled flat plate burner, flanges are provided at the lower end of the upper cylinder and at the upper and lower ends of the lower cylinder, respectively. The flange of the upper cylinder is fixedly connected to the flange at the upper end of the lower cylinder by screws, and the flange at the lower end of the lower cylinder is fixedly connected to the base plate by screws.

[0014] In the aforementioned air-cooled flat-plate burner, gaskets are provided between the flange of the upper cylinder and the flange at the upper end of the lower cylinder, and between the flange at the lower end of the lower cylinder and the base plate.

[0015] In the aforementioned air-cooled flat plate burner, a gas inlet pipe is provided on the side of the mixer, and a main gas valve is provided on the gas inlet pipe. A fan is connected to the side of the mixer away from the gas inlet pipe. An L-shaped gas pipe is provided inside the combustion cylinder. The upper end of the gas pipe is located below the corrugated plate assembly, and the lower end extends out of the combustion cylinder and connects to the gas pipeline. Multiple through holes are evenly distributed around the circumference of the upper side wall of the gas pipe. An ignition gas valve is provided on the part of the lower end of the gas pipe that extends out of the combustion cylinder.

[0016] In the aforementioned air-cooled flat-plate burner, a programmable controller is also included. The combustion chamber is equipped with an ignition assembly and a flame detection assembly. The ignition assembly, flame detection assembly, main gas valve, ignition gas valve, and fan are electrically connected to the programmable controller. The ignition assembly includes an ignition needle and an ignition grounding needle. The upper end of the ignition needle extends above the corrugated plate assembly, and the lower end extends to the bottom of the combustion chamber. The upper end of the ignition grounding needle extends above the corrugated plate assembly, and the lower end is fixed to the support frame. The flame detection assembly includes a detection probe and a detection grounding needle. The upper end of the detection probe extends above the corrugated plate assembly, and the lower end extends to the bottom of the combustion chamber. The upper end of the detection grounding needle extends above the corrugated plate assembly, and the lower end extends to the bottom of the combustion chamber.

[0017] The outstanding advantages of this utility model compared to the prior art are: In this invention, the mixed gas burns on the upper surface of the corrugated plate assembly, forming planar combustion. This results in a small combustion area, requiring a small furnace size and allowing for easy control of water volume. Simultaneously, the thicker corrugated plate assembly provides good backfire prevention, allowing for a higher open area ratio. The high open area ratio of the corrugated plate assembly in this invention leads to a high unit heat load, resulting in a large boiler tonnage with a 30L water capacity. Furthermore, this invention uses a support frame to support the corrugated plate assembly, resulting in a simple structure, convenient installation, and no impact on the flow rate of the mixed gas. An annular limiting plate, formed by bending the upper end of the combustion cylinder inwards, provides an upper limit for the corrugated plate assembly, making assembly simple and convenient. Attached Figure Description

[0018] Figure 1 This is a cross-sectional view of the present invention.

[0019] Figure 2 yes Figure 1 Enlarged view of point A.

[0020] Figure 3 This is a perspective view of the present invention.

[0021] Figure 4 This is a perspective view of the support frame of this utility model.

[0022] Figure 5 This is a top view of the corrugated plate assembly of this utility model.

[0023] Figure 6 This is a perspective view of the upper cylinder, ignition assembly, flame detection assembly, and gas pipe of this utility model.

[0024] Reference numerals in the attached diagram: 1. Combustion cylinder; 1a. Upper cylinder; 1b. Lower cylinder; 1c. Base plate; 2. Mixer; 3. Mixed gas inlet pipe; 4. Corrugated plate assembly; 4a. Annular plate; 4b. Corrugated plate; 5. Gas outlet; 6. Support frame; 6a. Support ring; 6b. Connecting rod; 7. Annular limiting plate; 8. Gas inlet pipe; 9. Fan; 10. Gas pipe; 11. Through hole; 12. Ignition needle; 13. Ignition grounding needle; 14. Detection probe; 15. Detection grounding needle. Detailed Implementation

[0025] The present invention will be further described below with reference to specific embodiments. See also: Figure 1 —6: An air-cooled flat-plate burner includes a cylindrical combustion cylinder 1 with an open top. A mixed gas inlet pipe 3, connecting to a mixer 2, is provided on the side wall of the combustion cylinder 1. A corrugated plate assembly 4 is provided at the upper opening of the combustion cylinder 1. The thickness of the corrugated plate assembly 4 is 20mm-60mm, and an air outlet 5 is provided inside the corrugated plate assembly 4. The opening ratio of the corrugated plate assembly 4 is 20%-60%. A support frame 6 for supporting the corrugated plate assembly 4 is provided inside the combustion cylinder 1. The support frame 6 includes multiple coaxially arranged support rings 6a. Adjacent support rings 6a are connected by a connecting rod 6b. The outermost support ring 6a is fixedly installed on the inner side wall of the combustion cylinder 1. The upper end of the combustion cylinder 1 is bent inward to form an annular limiting plate 7 that upper limit the corrugated plate assembly 4.

[0026] The working principle of this utility model is as follows: Figure 1-6 As shown, the mixture of gas and air enters the combustion chamber through the gas inlet pipe 3, and then enters the space above the corrugated plate group 4 through the outlet hole 5 of the corrugated plate group 4, and burns in the space above the corrugated plate group 4.

[0027] In this invention, the mixed gas burns on the upper surface of the corrugated plate assembly 4, forming planar combustion. This results in a small combustion area, requiring a small furnace size and allowing for easy control of water volume. Furthermore, the thicker corrugated plate assembly 4 provides good backfire prevention, allowing for a higher open area ratio. The high open area ratio of the corrugated plate assembly 4 results in a high unit heat load, enabling a large boiler tonnage with a 30L water capacity. Simultaneously, the corrugated plate assembly 4 is supported by a support frame 6, resulting in a simple structure, convenient installation, and no impact on the gas mixture throughput. An annular limiting plate 7, formed by bending the upper end of the combustion cylinder 1 inwards, provides an upper limit for the corrugated plate assembly 4, making assembly simple and convenient.

[0028] Preferably, the thickness of the corrugated plate assembly 4 is 40 mm, and the opening ratio of the corrugated plate assembly 4 is 40%.

[0029] The outermost support ring 6a is fixed to the inner wall of the combustion cylinder 1 by welding.

[0030] The structure of corrugated plate assembly 4: as follows Figure 5 As shown, the corrugated plate assembly 4 includes multiple coaxially arranged annular plates 4a, with a corrugated plate 4b between two adjacent annular plates 4a, and the air outlet 5 is formed between the corrugated plate 4b and the annular plate 4a.

[0031] Preferably, the materials of the annular plate 4a and the corrugated plate 4b are 310S stainless steel or 304 stainless steel.

[0032] Furthermore, the diameter of the vent 5 is 0.5mm-1.2mm. The diameter of the vent 5 is calculated by converting the irregular vent 5 into a circular hole of equal area.

[0033] Furthermore, the included angle α between the annular limiting plate 7 and the combustion cylinder 1 is 90°-160°. In this embodiment, the included angle α between the annular limiting plate 7 and the combustion cylinder 1 is 150°.

[0034] The structure of combustion chamber 1 is as follows: Figure 1 , 3 As shown in Figure 6, the combustion cylinder 1 includes an upper cylinder 1a with openings at the top and bottom, a lower cylinder 1b with openings at the top and bottom, and a bottom plate 1c covering the lower end of the lower cylinder 1b. The corrugated plate assembly 4 is disposed at the upper end of the upper cylinder 1a, and the mixed gas inlet pipe 3 is disposed on the side wall of the lower cylinder 1b. The structure is simple and facilitates the processing and installation of the combustion cylinder 1 and the installation of the corrugated plate assembly 4.

[0035] Connection structure between the mixed gas inlet pipe 3 and the lower cylinder 1b: The mixed gas inlet pipe 3 is fixed to the side wall of the lower cylinder 1b by welding.

[0036] Connection structure of each part of the combustion cylinder 1: The lower end of the upper cylinder 1a and the upper and lower ends of the lower cylinder 1b are respectively provided with flanges. The flange of the upper cylinder 1a and the flange at the upper end of the lower cylinder 1b are fixedly connected by screws. The flange at the lower end of the lower cylinder 1b is fixedly connected to the base plate 1c by screws.

[0037] In order to improve the sealing of each connection of the combustion cylinder 1, gaskets are provided between the flange of the upper cylinder 1a and the flange at the upper end of the lower cylinder 1b, and between the flange at the lower end of the lower cylinder 1b and the base plate 1c.

[0038] Furthermore, the mixer 2 is provided with a gas inlet pipe 8 on its side, and a main gas valve is provided on the gas inlet pipe 8. A blower 9 is connected to the side of the mixer 2 away from the mixed gas inlet pipe 3. An L-shaped gas pipe 10 is provided inside the combustion chamber 1. The upper end of the gas pipe 10 is located below the corrugated plate assembly 4, and the lower end extends out of the combustion chamber 1 and connects to the gas pipeline. Multiple through holes 11 are evenly distributed around the circumference of the upper side wall of the gas pipe 10. An ignition gas valve is provided on the lower part of the gas pipe 10 that extends out of the combustion chamber 1. During ignition, the ignition gas valve is opened, and a small portion of the gas enters the combustion chamber 1 through the gas pipe 10 and forms an ignition flame on the upper surface of the corrugated plate assembly 4. Then, the ignition gas valve is closed, and the main gas valve and the blower 9 are opened. The main gas enters the mixer through the gas inlet pipe 8 and mixes with the air pushed by the blower 9. After mixing, it enters the combustion chamber 1 through the mixed gas inlet pipe 3 to achieve continuous combustion.

[0039] This invention ignites the flame by using a small portion of the gas first, resulting in a high ignition success rate, reduced risk of flameout, and good safety.

[0040] Furthermore, the L-shaped gas pipe 10 is fixedly installed inside the combustion chamber 1 at its lower end.

[0041] To achieve automatic control and facilitate monitoring of the combustion status above the corrugated plate assembly 4, a programmable controller is also included. The combustion chamber 1 is equipped with an ignition assembly and a flame detection assembly. The ignition assembly, flame detection assembly, main gas valve, ignition gas valve, and blower 9 are electrically connected to the programmable controller. The ignition assembly includes an ignition needle 12 and an ignition grounding needle 13. The upper end of the ignition needle 12 extends above the corrugated plate assembly 4, and the lower end extends to the bottom of the combustion chamber 1. The upper end of the ignition grounding needle 13 extends above the corrugated plate assembly 4, and the lower end is fixed to the support frame 6. The flame detection assembly includes a detection probe 14 and a detection grounding needle 15. The upper end of the detection probe 14 extends above the corrugated plate assembly 4, and the lower end extends to the bottom of the combustion chamber 1. The upper end of the detection grounding needle 15 extends above the corrugated plate assembly 4, and the lower end extends to the bottom of the combustion chamber 1.

[0042] Once the ignition flame is generated, the flame detection component sends a signal to the programmable controller, which then controls the ignition gas valve to close and the main gas valve to open.

[0043] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. An air-cooled flat-plate burner, characterized in that: The combustion chamber (1) is cylindrical and open at the top. A gas inlet pipe (3) for connecting a mixer (2) is provided on the side wall of the combustion chamber (1). A corrugated plate assembly (4) is provided at the upper opening of the combustion chamber (1). The thickness of the corrugated plate assembly (4) is 20mm-60mm. An air outlet (5) is provided inside the corrugated plate assembly (4). The opening ratio of the corrugated plate assembly (4) is 20%-60%. A support frame (6) for supporting the corrugated plate assembly (4) is provided inside the combustion chamber (1). The support frame (6) includes multiple coaxially arranged support rings (6a). Two adjacent support rings (6a) are connected by a connecting rod (6b). The outermost support ring (6a) is fixedly installed on the inner side wall of the combustion chamber (1). The upper end of the combustion chamber (1) is bent inward to form an annular limiting plate (7) for upper limit positioning of the corrugated plate assembly (4).

2. The air-cooled flat-plate burner according to claim 1, characterized in that: The corrugated plate assembly (4) includes multiple coaxially arranged annular plates (4a), with a corrugated plate (4b) between two adjacent annular plates (4a), and the air outlet (5) is formed between the corrugated plate (4b) and the annular plate (4a).

3. The air-cooled flat-plate burner according to claim 2, characterized in that: The diameter of the air outlet (5) is 0.5mm-1.2mm.

4. The air-cooled flat-plate burner according to claim 1, characterized in that: The included angle α between the annular limiting plate (7) and the combustion cylinder (1) is 90°-160°.

5. The air-cooled flat-plate burner according to claim 1, characterized in that: The combustion cylinder (1) includes an upper cylinder (1a) with openings at the top and bottom, a lower cylinder (1b) with openings at the top and bottom, and a bottom plate (1c) covering the lower end of the lower cylinder (1b). The corrugated plate assembly (4) is disposed at the upper end of the upper cylinder (1a), and the mixed gas inlet pipe (3) is disposed on the side wall of the lower cylinder (1b).

6. The air-cooled flat-plate burner according to claim 5, characterized in that: The upper cylinder (1a) and the lower cylinder (1b) are respectively provided with flanges at the lower end and the upper and lower ends. The flange of the upper cylinder (1a) and the flange at the upper end of the lower cylinder (1b) are fixedly connected by screws, and the flange at the lower end of the lower cylinder (1b) is fixedly connected to the base plate (1c) by screws.

7. The air-cooled flat-plate burner according to claim 1, characterized in that: The mixer (2) is provided with a gas inlet pipe (8) on its side. A main gas valve is provided on the gas inlet pipe (8). A fan (9) is connected to the side of the mixer (2) away from the gas inlet pipe (3). An L-shaped gas pipe (10) is provided inside the combustion cylinder (1). The upper end of the gas pipe (10) is located below the corrugated plate group (4), and the lower end extends out of the combustion cylinder (1) to connect to the gas pipeline. Multiple through holes (11) are evenly distributed around the upper side wall of the gas pipe (10). An ignition gas valve is provided on the part of the lower end of the gas pipe (10) that extends out of the combustion cylinder (1).

8. The air-cooled flat-plate burner according to claim 7, characterized in that: It also includes a programmable controller. The combustion chamber (1) is provided with an ignition assembly and a flame detection assembly. The ignition assembly, flame detection assembly, main gas valve, ignition gas valve and blower (9) are electrically connected to the programmable controller. The ignition assembly includes an ignition needle (12) and an ignition grounding needle (13). The upper end of the ignition needle (12) extends above the corrugated plate group (4) and the lower end extends to the bottom of the combustion chamber (1). The upper end of the ignition grounding needle (13) extends above the corrugated plate group (4) and the lower end is fixed on the support frame (6). The flame detection assembly includes a detection probe (14) and a detection grounding needle (15). The upper end of the detection probe (14) extends above the corrugated plate group (4) and the lower end extends to the bottom of the combustion chamber (1). The upper end of the detection grounding needle (15) extends above the corrugated plate group (4) and the lower end extends to the bottom of the combustion chamber (1).

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