Heat storage combustion flat single radiant tube device

Abstract

The utility model belongs to the technical field of combustors, and discloses a heat storage combustion flat single radiant tube device which is provided with a heat storage type combustor and a flame radiation flat single tube, and flames combusted by the heat storage type combustor are jetted in the flame radiation flat single tube. Formed flue gas flows back into the heat accumulating type combustor along the pipe wall of the flame radiation flat single pipe and is exhausted after heat is absorbed by a heat accumulator; the heat storage combustion flat single radiant tube device integrates combustion, heat transfer, smoke exhaust and heat storage, and during working, air and smoke need to be reversed, and fuel does not need to be reversed; the utility model has the beneficial effects of small volume of installation space in the furnace, compact structure, uniform temperature of the radiant tube wall and the like.

Description

Technical Field

[0001] This utility model belongs to the field of burner technology, and in particular relates to a regenerative combustion flat single radiant tube device. Background Technology

[0002] Radiant tubes are commonly used heating devices in industrial kilns, with radiation being the primary heat transfer method. The application of radiant tube heating devices in industrial kilns allows for control of the furnace atmosphere, preventing combustion products and flue gas from directly contacting the heated workpieces, thus improving heating quality. They are widely used in controlled atmosphere furnaces for metal heat treatment, galvanizing, magnesium plating, aluminum plating, and industrial cleaning and drying.

[0003] In the prior art, CN111197743A discloses a regenerative M-shaped radiant tube unit and its combustion method. The regenerative M-shaped radiant tube unit includes: a regenerative burner, an M-shaped flame radiant tube, and a reversing device for regenerative combustion; the regenerative burner is connected to the M-shaped flame radiant tube, and the reversing device is connected to the regenerative burner. The regenerative M-shaped radiant tube unit is integrated as a whole, combining combustion, heat transfer, flue gas exhaust, and heat storage; the regenerative burner can use high-calorific-value fuels such as liquefied petroleum gas, natural gas, coke oven gas, and light oil.

[0004] The aforementioned existing technologies have the following drawbacks: 1. The M-shaped radiant tubes occupy a large space inside the furnace, which is not conducive to dense installation in some furnaces where high temperature difference is required; 2. The airflow travels a relatively long distance inside the tube, and the wall temperature is not as uniform as that of a single tube; 3. The use of external telescopic tube components for flue gas return results in a large external installation volume, high material consumption and cost, and relatively complex installation. Utility Model Content

[0005] To address the aforementioned problems, the purpose of this utility model is to disclose a heat storage combustion flat single radiant tube device, which is achieved using the following technical solution.

[0006] A regenerative combustion flat single radiant tube device includes a regenerative burner, a furnace wall mounting connector, and a flame radiant flat single tube, wherein the regenerative burner and the flame radiant flat single tube are fixed together by the furnace wall mounting connector.

[0007] The regenerative burner is characterized by having a first regenerative chamber and a second regenerative chamber inside, with a regenerative body inside the first and second regenerative chambers, and an inlet connected to one end of each of the first and second regenerative chambers.

[0008] The regenerative burner is equipped with an airflow straightening head, a mixing chamber in the middle of the airflow straightening head, a flame nozzle at one end of the mixing chamber, and a fuel spray gun at the other end of the mixing chamber.

[0009] The mixing chamber has a first mixing channel and a second mixing channel on both sides, which are connected to the mixing chamber. The first mixing channel is connected to the other end of the first heat storage chamber, and the second mixing channel is connected to the other end of the second heat storage chamber.

[0010] The regenerative burners on both sides of the airflow straightening head are equipped with a first return flue and a second return flue. One end of the first return flue is connected to the first mixing channel, and one end of the second return flue is connected to the second mixing channel.

[0011] One end of the flame-radiating flat single tube is sleeved in the furnace wall mounting connector, and the other end is closed. The sleeve of the flame-radiating flat single tube and the furnace wall mounting connector forms a first flue gas channel and a second flue gas channel. The first flue gas channel is connected to the other end of the first return flue, and the second flue gas channel is connected to the other end of the second return flue.

[0012] The regenerative burner is also equipped with an ignition detection device.

[0013] The aforementioned regenerative combustion flat single-radiant tube device has a first return flue and a second return flue connected by a balance channel.

[0014] The aforementioned heat storage combustion flat single radiant tube device, when projected from one end to the other, has a flat inner cavity wall on both the upper and lower sides of the cross-section of the flame radiating flat single tube.

[0015] The aforementioned heat storage combustion flat single radiant tube device, when projected from one end to the other, has outwardly protruding arc-shaped inner walls on both sides of the flame radiating flat single tube.

[0016] The aforementioned heat storage combustion flat single radiant tube device, when projected from top to bottom, has a semi-circular inner wall at the other end of the flame radiating flat single tube.

[0017] The above-described heat storage combustion flat single radiant tube device is characterized in that: the first heat storage chamber is sequentially connected to the first heat storage channel and the first nozzle, and the first nozzle and the first mixing channel are connected by a first return flue; the second heat storage chamber is sequentially connected to the second heat storage channel and the second nozzle, and the second nozzle and the second mixing channel are connected by a second return flue.

[0018] The above-described heat storage combustion flat single radiant tube device has a first heat storage chamber and a second heat storage chamber that are separated from each other and parallel to each other.

[0019] The aforementioned regenerative combustion flat single radiant tube device and ignition detection device enable ignition and flame detection.

[0020] The aforementioned regenerative combustion flat single-radiation tube device has one end of the ignition detection device located within the mixing chamber.

[0021] The aforementioned regenerative combustion flat single radiant tube device uses heat-resistant steel as the material for the flame radiant flat single tube and refractory castable and other high-temperature resistant materials as the inner cavity material for the regenerative burner.

[0022] This utility model has the following beneficial effects:

[0023] 1. The flat single-tube regenerative combustion system integrates combustion, heat transfer, and flue gas exhaust within its single tube, featuring a compact structure and concentrated functions. It uses less heat-resistant material, resulting in lower costs. 2. Compared to M-radiant tubes, the airflow length is shorter, and the flue gas and flame reside within the same flat single-tube system, improving wall temperature uniformity and furnace temperature quality. 3. The single tube occupies little space within the furnace, facilitating dense installation and making it more suitable for applications with high process requirements and small furnace temperature differences. Its compact structure and small installation volume further enhance its advantages.

[0024] 4. It can effectively reduce the flame combustion temperature of regenerative burners, thereby saving fuel and reducing NOx formation.

[0025] 5. It achieves the function of switching air and flue gas without switching fuel, making it more convenient to use. It also avoids the fuel nozzle that stops supplying fuel due to fuel switching, which may cause head coking or reduced life due to high temperature under the action of high-temperature flue gas.

[0026] 6. The low-oxygen mixture formed by air and flue gas can reduce the oxygen content by more than 15%. When it is premixed and burned with high-calorific-value fuel, it can achieve high-temperature low-oxygen combustion, which can further reduce the formation of NOx. Attached Figure Description

[0027] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of the present utility model.

[0028] Figure 2 This is a front view of an embodiment of the present utility model.

[0029] Figure 3 This is a schematic cross-sectional view of an embodiment of the present invention.

[0030] Figure 4 This is a top view of an embodiment of the present utility model.

[0031] Figure 5 This is a left view of an embodiment of the present utility model.

[0032] Figure 6 This is a schematic cross-sectional view of an embodiment of the present invention.

[0033] Figure 7 This is a schematic cross-sectional view of BB of an embodiment of the present invention.

[0034] Figure 8 This is a CC cross-sectional schematic diagram of an embodiment of the present invention.

[0035] Figure 9 This is a schematic cross-sectional view of an embodiment of the present invention.

[0036] Figure 10 This is a schematic cross-sectional view of the EE section of an embodiment of this utility model.

[0037] Figure 11 This is a perspective view of the airflow sorting head end face of the regenerative burner according to an embodiment of the present invention.

[0038] Figure 12 This is a perspective view of the end face of the furnace wall mounting connector according to an embodiment of this utility model.

[0039] In the figure, the corresponding figures are as follows: 1. Regenerative burner, 11. First inlet, 12. Second inlet, 13. First regenerative chamber, 21. Mixing chamber, 22. Airflow straightening head, 23. Flame nozzle, 24. First regenerative channel, 25. Second regenerative channel, 26. First nozzle, 27. Second nozzle, 28. First return flue, 29. Second return flue, 210. First mixing channel, 211. Second mixing channel, 212. Balancing channel, 3. Furnace wall mounting connector, 4. Flame radiation flat single tube, 41. First flue gas channel, 42. Second flue gas channel, 5. Fuel spray gun, 6. Ignition detection device. Detailed Implementation

[0040] Example: Figures 1 to 12 A regenerative combustion flat single radiant tube device includes a regenerative burner 1, a furnace wall mounting connector 3, and a flame radiant flat single tube 4. The regenerative burner 1 and the flame radiant flat single tube 4 are fixed together by the furnace wall mounting connector 3, and the flame radiant flat single tube 4 is located on the right side of the regenerative burner 1.

[0041] The regenerative burner 1 is provided with a parallel and vertical first regenerative chamber 13 and a second regenerative chamber 14. The first regenerative chamber 13 and the second regenerative chamber 14 are provided with regenerative bodies. The first regenerative chamber 13 is provided with a first inlet 11 on the upper side, and the second regenerative chamber 14 is provided with a second inlet 12 on the upper side. The first inlet 11 and the second inlet 12 are used to input air or discharge flue gas.

[0042] The regenerative burner 1 has an airflow straightening head 22 on the lower right side, a mixing chamber 21 in the middle of the airflow straightening head 22, a flame nozzle 23 at the right end of the mixing chamber 21, and a fuel spray gun 5 connected to the left end of the mixing chamber 21 for spraying high-calorific-value fuels such as liquefied petroleum gas, natural gas, coke oven gas and light oil.

[0043] The rear side of the mixing chamber 21 is connected to one end of a first mixing channel 210, and the front side of the mixing chamber 21 is connected to one end of a second mixing channel 211.

[0044] A first return flue 28 is provided in the regenerative burner 1 on the rear side of the airflow straightening head 22, and a second return flue 29 is provided in the regenerative burner 1 on the front side of the airflow straightening head 22.

[0045] One end of the first flue 28 is connected to the first mixing channel 210, and one end of the second flue 29 is connected to the second mixing channel 211.

[0046] The first flue 28 and the second flue 29 are connected by two balancing channels 212;

[0047] The first heat storage chamber 13 is connected to the first heat storage channel 24 and the first nozzle 26 in sequence below. The first nozzle 26 and the first mixing channel 210 are connected by the first return flue 28. The second heat storage chamber 14 is connected to the second heat storage channel 25 and the second nozzle 27 in sequence below. The second nozzle 27 and the second mixing channel 211 are connected by the second return flue 29.

[0048] The left end of the flame radiation flat single tube 4 is sleeved in the furnace wall mounting connector 3, and the right end is closed. Projected from left to right, the inner walls of the upper and lower sides of the cross-section of the flame radiation flat single tube 4 are flat, and the inner walls of the left and right sides of the flame radiation flat single tube 4 are outwardly protruding arcs. Projected from top to bottom, the sleeve of the flame radiation flat single tube 4 and the furnace wall mounting connector 3 forms a first flue gas channel 41 and a second flue gas channel 42, which are respectively connected to the first return flue duct 28 and the second return flue duct 29 on the corresponding regenerative burner 1.

[0049] The regenerative burner 1 is also equipped with an ignition detection device 6, one end of which is located in the mixing chamber 21.

[0050] Working principle: Open the fuel spray gun 5 and introduce high-calorific-value fuel into the mixing chamber 21. Open the first inlet 11 and the second inlet 12. Air is introduced into the first inlet 11 and the second inlet 12 is used for exhaust. The air enters from the first inlet 11, flows through the first heat storage chamber 13, the first heat storage channel 24 and the first nozzle 26 to form an air jet. It is sprayed into the first mixing channel 210 through the first return flue 28 and then enters the mixing chamber 21. After the air and high-calorific-value fuel are fully mixed in the mixing chamber 21, they are ignited by the ignition detection device 6 and sprayed into the flame radiation flat single tube 4 from the flame nozzle 23. The flue gas formed by combustion is divided into two streams at the end of the flame radiation flat single tube 4 and flows back along the inner wall of the flame radiation flat single tube 4.

[0051] A stream of flue gas flows through the first flue gas passage 41, through the second return flue 29, the second nozzle 27, the second heat storage passage 25, and the second heat storage chamber 14, and then exits from the second inlet 12. When it flows through the second heat storage chamber 14, it heats the heat storage body inside the second heat storage chamber 14.

[0052] Another stream of flue gas flows through the second flue gas passage 42 and then through the first return flue 28. Part of the flue gas is introduced into the first mixing passage 210 by the air jet, forming a low-oxygen mixture of air and flue gas with the air in the first mixing passage 210, reducing the oxygen content in the air. The low-oxygen mixture and the high-calorific-value fuel burn stably at the flame nozzle 23. The other part of the flue gas merges with the flue gas flowing through the second return flue 29 through the balance passage 212, and flows through the second nozzle 27, the second heat storage passage 25, and the second heat storage chamber 14 before being discharged from the second inlet 12.

[0053] After preheating for a period of time, the flow is reversed. Air is introduced into the second inlet 12, and the first inlet 11 is used for exhaust. The air enters from the second inlet 12, flows through the second heat storage chamber 14 and the second heat storage channel 25, is heated by the heat storage body in the second heat storage channel 25, and then forms an air jet through the second nozzle 27. After being sprayed into the second mixing channel 211 through the first return flue 29, it enters the mixing chamber 21. After the air and high calorific value fuel are fully mixed in the mixing chamber 21, they are ignited by the ignition detection device 6 and sprayed into the flame radiation flat single tube 4 from the flame nozzle 23. The flue gas formed by combustion is divided into two streams at the end of the flame radiation flat single tube 4 and flows back along the inner wall of the flame radiation flat single tube 4.

[0054] A stream of flue gas flows through the second flue gas passage 42, through the first return flue 28, the first nozzle 26, the first heat storage passage 24, and the first heat storage chamber 13, and then exits from the first inlet 11. When it flows through the first heat storage chamber 13, it heats the heat storage body inside the first heat storage chamber 13.

[0055] Another stream of flue gas flows through the first flue gas passage 41 and then through the second return flue 29. Part of the flue gas is introduced into the second mixing passage 211 by the air jet, forming a low-oxygen mixture of air and flue gas with the air in the second mixing passage 211, reducing the oxygen content in the air. The low-oxygen mixture and the high-calorific-value fuel are stably burned at the burner nozzle 23. The other part of the flue gas merges with the flue gas flowing through the first return flue 28 through the balance passage 212, and flows through the first nozzle 26, the second heat storage passage 25, and the second heat storage chamber 14 before being discharged from the first inlet 11.

[0056] By repeating this process of reversing direction, heat storage combustion is achieved.

[0057] In the above embodiments, the temperature of the flue gas discharged from the first inlet 11 or the second inlet 12 is ≤150°C.

[0058] In the above embodiments, the first inlet 11 or the second inlet 12 that needs to be vented with air can be supplied with positive pressure air by a blower, and the second inlet 12 or the first inlet 11 that needs to be vented with flue gas can be supplied with an induced draft fan or other negative pressure device with similar function.

[0059] In the above embodiments, the material of the flame radiation flat single tube 4 is a refractory material.

[0060] This utility model has the following beneficial effects:

[0061] 1. The flat single-radiant tube device for heat storage combustion integrates combustion, heat transfer and smoke exhaust in one flat single tube. It has a compact structure and concentrated functions. The flat single tube for flame radiation uses less heat-resistant material and has a low cost.

[0062] 2. Compared with M-shaped radiant tubes, the airflow length is shorter, and the flue gas and flame are in the same flat single flame radiant tube, which improves the uniformity of wall temperature and improves the quality of furnace temperature.

[0063] 3. A single tube occupies little space inside the furnace, which is conducive to dense installation. It is more suitable for some processes with high requirements and small temperature difference inside the furnace. It has a compact structure and small installation volume.

[0064] 4. It can effectively reduce the flame combustion temperature of regenerative burners, thereby saving fuel and reducing NOx formation.

[0065] 5. It achieves the function of switching air and flue gas without switching fuel, making it more convenient to use. It also avoids the fuel nozzle that stops supplying fuel due to fuel switching, which may cause head coking or reduced life due to high temperature under the action of high-temperature flue gas.

[0066] 6. The low-oxygen mixture formed by air and flue gas can reduce the oxygen content by more than 15%. When it is premixed and burned with high-calorific-value fuel, it can achieve high-temperature low-oxygen combustion, which can further reduce the formation of NOx.

[0067] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A regenerative combustion flat single radiant tube device, comprising a regenerative burner (1), a furnace wall mounting connector (3), and a flame radiant flat single tube (4), wherein the regenerative burner (1) and the flame radiant flat single tube (4) are fixed together by the furnace wall mounting connector (3); Its features are: The regenerative burner (1) is provided with a first regenerative chamber (13) and a second regenerative chamber (14). The first regenerative chamber (13) and the second regenerative chamber (14) have a heat storage body inside. One end of the first regenerative chamber (13) and the second regenerative chamber (14) are respectively connected to an inlet. The regenerative burner (1) is provided with an airflow straightening head (22), and a mixing chamber (21) is provided in the middle of the airflow straightening head (22). One end of the mixing chamber (21) is provided with a flame nozzle (23), and the other end of the mixing chamber (21) is connected to a fuel spray gun (5). The mixing chamber (21) is provided with a first mixing channel (210) and a second mixing channel (211) on both sides, which are connected to the mixing chamber (21). The first mixing channel (210) is connected to the other end of the first heat storage chamber (13), and the second mixing channel (211) is connected to the other end of the second heat storage chamber (14). The regenerative burners (1) on both sides of the airflow straightening head (22) are provided with a first return flue (28) and a second return flue (29). One end of the first return flue (28) is connected to the first mixing channel (210), and one end of the second return flue (29) is connected to the second mixing channel (211). One end of the flame radiation flat single tube (4) is sleeved in the furnace wall mounting connector (3), and the other end is closed. The sleeve of the flame radiation flat single tube (4) and the furnace wall mounting connector (3) forms a first flue gas channel (41) and a second flue gas channel (42). The first flue gas channel (41) is connected to the other end of the first return flue (28), and the second flue gas channel (42) is connected to the other end of the second return flue (29). The regenerative burner (1) is also equipped with an ignition detection device.

2. The regenerative combustion flat single radiant tube device according to claim 1, characterized in that: The first flue (28) and the second flue (29) are connected by a balancing channel (212).

3. The regenerative combustion flat single radiant tube device according to claim 2, characterized in that: Projecting from one end to the other, the inner walls of the upper and lower sides of the cross-section of the flame-radiated flat single tube (4) are flat.

4. The regenerative combustion flat single radiant tube device according to claim 3, characterized in that: Projecting from one end to the other, the inner walls of the left and right sides of the flame radiation flat single tube (4) are outwardly protruding arcs.

5. A regenerative combustion flat single radiant tube device according to claim 4, characterized in that: Projected from top to bottom, the other end of the inner wall of the flame-radiated flat single tube (4) is semi-circular.

6. The regenerative combustion flat single radiant tube device according to claim 5, characterized in that: The first heat storage chamber (13) is connected in sequence to the first heat storage channel (24) and the first nozzle (26). The first nozzle (26) and the first mixing channel (210) are connected in the air by the first return flue (28). The second heat storage chamber (14) is connected in sequence to the second heat storage channel (25) and the second nozzle (27). The second nozzle (27) and the second mixing channel (211) are connected in the air by the second return flue (29).

7. A regenerative combustion flat single radiant tube device according to claim 6, characterized in that: The first heat storage chamber (13) and the second heat storage chamber (14) are separated from each other and are parallel.

8. A regenerative combustion flat single radiant tube device according to claim 7, characterized in that: The ignition detection device (6) realizes ignition and flame detection.

9. A regenerative combustion flat single radiant tube device according to claim 8, characterized in that: One end of the ignition detection device (6) is located inside the mixing chamber (21).

10. A regenerative combustion flat single radiant tube device according to claim 9, characterized in that: The material of the flame radiation flat single tube (4) is heat-resistant steel, and the material of the regenerative burner cavity is refractory castable.

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