A gradually expanded ejection full-premix water-cooled combustor

Abstract

This invention discloses a gradually expanding ejector premixed water-cooled burner, comprising a burner body, an air inlet pipe, a gradually expanding premixing chamber fixedly connected inside the air inlet pipe, a gas nozzle fixedly connected upstream of the gradually expanding premixing chamber, and a premixing chamber fixedly connected to the end of the gradually expanding premixing chamber away from the gas nozzle. The air inlet, gas nozzle, gradually expanding premixing chamber, and premixing chamber are interconnected. The gas nozzle is connected to a gas main pipe. A diffuser chamber is fixedly connected to the end of the premixing chamber away from the gas nozzle, and the premixing chamber is connected to the diffuser chamber. A water cooling device is also included, comprising a water-cooled pipe bank, with an upper header and a lower header connected to both ends of the water-cooled pipe bank. A water outlet pipe is connected to the upper header, and a water inlet pipe is connected to the lower header. This invention ensures uniform mixing and distribution of the premixed gas, more stable combustion of combustible gas, and reduces the formation of nitrogen oxides.

Description

Technical Field

[0001] This invention relates to the field of burner technology, and in particular to a gradually expanding ejector fully premixed water-cooled burner. Background Technology

[0002] With the gradual deterioration of the ecological environment, the prevention and control of air pollution has become an urgent task. Ultra-low NOx combustion technology is currently the most widely used new technology in the market to achieve ultra-low NOx emissions. However, existing burners generally suffer from problems such as large mixing device volume, difficulty in achieving uniform mixing, high flame temperature during combustion, easy burn-out of the burner head, high NOx emissions, easy backfire and deflagration, and inability to achieve stable combustion. To address these issues, a gradually expanding ejector fully premixed water-cooled burner is proposed. Summary of the Invention

[0003] The purpose of this invention is to provide a gradually expanding ejector fully premixed water-cooled burner to solve the problems existing in the prior art, so as to make the premixed gas mix and distribute evenly, reduce the risk of backfire and deflagration, reduce the flame temperature during the combustion process, reduce the generation of nitrogen oxides, and make the combustion more stable.

[0004] To achieve the above objectives, the present invention provides the following solution: The present invention provides a gradually expanding ejector fully premixed water-cooled burner, comprising:

[0005] The burner body includes an air inlet pipe with an air inlet. A gradually expanding premixing box is fixedly connected inside the air inlet pipe. A gas nozzle is fixedly connected to the upstream end of the gradually expanding premixing box. A premixing chamber is fixedly connected to the end of the gradually expanding premixing box away from the gas nozzle. The air inlet, the gas nozzle, the gradually expanding premixing box, and the premixing chamber are interconnected. The gas nozzle is connected to a gas main pipe. A diffuser chamber is fixedly connected to the end of the premixing chamber away from the gas nozzle. The premixing chamber is connected to the diffuser chamber.

[0006] A water-cooling device, comprising a water-cooled pipe bank, with an upper manifold and a lower manifold connected to both ends of the water-cooled pipe bank. An outlet pipe is connected to the upper manifold, and an inlet pipe is connected to the lower manifold.

[0007] Preferably, the gas nozzle includes an annular sleeve and a plurality of gas branch pipes. The annular sleeve includes an inner wall and an outer wall. The gas branch pipes are fixedly connected to the inner wall and the outer wall of the annular sleeve. A cavity between the inner wall and the outer wall of the annular sleeve forms a gas passage. The gas passage communicates with the gas branch pipes. The gas branch pipes extend out of the inlet pipe and are fixedly connected to and communicate with the main gas pipe. The gas outlet direction of the gas branch pipes is downstream of the inlet pipe. A plurality of partitions are fixedly connected between the inner wall and the outer wall of the annular sleeve. A plurality of sealing plates are fixedly connected between two adjacent gas branch pipes. The sealing plates are located inside the inlet pipe.

[0008] Preferably, a louvered cyclone separator is fixedly connected to the premixing chamber.

[0009] Preferably, the water-cooled pipe bank includes a plurality of water-cooled pipes, the water-cooled pipes are fixedly connected to the diffuser chamber, the two ends of the water-cooled pipes are respectively connected to the upper header and the lower header of the water-cooled pipe bank, and a vent plate is fixedly connected between two adjacent water-cooled pipes, the vent plate having a plurality of air holes.

[0010] Preferably, the vent plate includes an air inlet plate and a flow guide plate, the air inlet plate and the flow guide plate are located on both sides of the water cooling pipe, and the air hole includes a first air inlet and a second air inlet, the first air inlet is opened on the flow guide plate, and the second air inlet is opened on the air inlet plate.

[0011] This invention discloses the following technical effects: In this device, air enters the intake pipe through the air inlet, and combustible gas flows from the main gas pipe to the gas nozzle and is ejected. The gas nozzle ejects high-pressure combustible gas, and the air and combustible gas mix in the gradually expanding premixing box and the premixing chamber. The mixed gas enters the diffuser chamber, then passes through the water-cooled pipe bank, and is ignited and burned by the ignition device. The mixed gas burns on the surface of the water-cooled pipe bank. Water enters the lower header of the water-cooled pipe bank from the water inlet pipe, absorbs heat within the water-cooled pipe bank, lowers the temperature of the combustion flame, achieves stable combustion, and reduces the formation of nitrogen oxides. Hot water flows into the upper header of the water-cooled pipe bank and flows out from the outlet pipe. This invention ensures uniform mixing and distribution of the premixed gas, more stable combustion of the combustible gas, and reduces the formation of nitrogen oxides. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the gradually expanding ejector fully premixed water-cooled burner structure in this invention;

[0014] Figure 2 for Figure 1 Sectional view of AA;

[0015] Figure 3 This is a top view of the present invention;

[0016] Figure 4 for Figure 3 A magnified view of part B in the image;

[0017] Figure 5 This is a schematic diagram of the flat guide plate structure of the present invention;

[0018] Figure 6 This is a schematic diagram of the V-shaped water-cooled pipe bank structure of the present invention;

[0019] Figure 7 This is a side view of the V-shaped water-cooled pipe array of the present invention;

[0020] Figure 8 This is a schematic diagram of the cylindrical water-cooled pipe array structure of the present invention;

[0021] Figure 9 This is a side view of the cylindrical water-cooled pipe array of the present invention;

[0022] The components are as follows: 1. Air inlet; 2. Gas branch pipe; 3. Annular sleeve; 4. Gas main pipe; 5. Gas outlet; 6. Gradient premixing box; 7. Premixing chamber; 8. Louvered cyclone separator; 9. Diffuser chamber; 10. Water outlet pipe; 11. Upper header of water-cooled pipe bank; 12. Water-cooled pipe bank; 13. Lower header of water-cooled pipe bank; 14. Water inlet pipe; 15. Baffle plate; 16. Inner wall of annular sleeve; 17. Outer wall of annular sleeve; 18. Sealing plate; 19. Air inlet plate; 20. Second air inlet; 21. Gas passage; 22. First air inlet; 23. Guide plate; 24. Water-cooled pipe; 25. Air inlet pipe. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Reference Figure 1-4This invention provides a gradually expanding ejector fully premixed water-cooled burner, comprising:

[0026] The burner body includes an air inlet pipe 25, an air inlet 1 on the air inlet pipe 25, a gradually expanding premixing box 6 fixedly connected inside the air inlet pipe 25, a gas nozzle fixedly connected to the upstream end of the gradually expanding premixing box 6, a premixing chamber 7 fixedly connected to the end of the gradually expanding premixing box 6 away from the gas nozzle, the air inlet 1, the gas nozzle, the gradually expanding premixing box 6 and the premixing chamber 7 are interconnected, the gas nozzle is connected to a gas main pipe 4, and a diffuser chamber 9 is fixedly connected to the end of the premixing chamber 7 away from the gas nozzle, and the premixing chamber 7 is connected to the diffuser chamber 9.

[0027] The water cooling device includes a water cooling pipe bank 12, with an upper water cooling pipe bank header 11 and a lower water cooling pipe bank header 13 connected to both ends of the water cooling pipe bank 12. The upper water cooling pipe bank header 11 is connected to an outlet pipe 10, and the lower water cooling pipe bank header 13 is connected to an inlet pipe 14.

[0028] Air enters the intake pipe 25 through the air inlet 1. Combustible gas flows from the gas main pipe 4 to the gas nozzle and is ejected. The gas nozzle ejects high-pressure combustible gas. Air and combustible gas are mixed in the diffuser premixing box 6 and the premixing chamber 7. The flow rate of high-pressure combustible gas is reduced in the diffuser premixing box 6, allowing it to stay in the premixing chamber 7 for a longer time, resulting in a more uniform mixture. The mixed gas enters the diffuser chamber 9, passes through the water-cooled pipe bank 12, and reaches the furnace (not shown in the figure). It is ignited and burned by the ignition device. The mixed gas burns on the surface of the water-cooled pipe bank 12. Water enters the lower header 13 of the water-cooled pipe bank from the water inlet pipe 14, absorbs heat in the water-cooled pipe bank 12, and reduces the temperature of the combustion flame to achieve stable combustion and reduce the generation of nitrogen oxides. Hot water flows into the upper header 11 of the water-cooled pipe bank and flows out from the outlet pipe 10.

[0029] Further optimization of the scheme: the gas nozzle includes an annular sleeve 3 and several gas branch pipes 2. The annular sleeve 3 includes an inner wall 16 and an outer wall 17. The gas branch pipes 2 are fixedly connected to the inner wall 16 and the outer wall 17 of the annular sleeve. The cavity between the inner wall 16 and the outer wall 17 of the annular sleeve forms a gas passage. The gas passage is connected to the gas branch pipes 2. The gas branch pipes 2 extend out of the inlet pipe 25. The gas branch pipes 2 are fixedly connected to and connected to the main gas pipe 4. The gas outlet direction of the gas branch pipes 2 is downstream of the inlet pipe 25. Several partitions 15 are fixedly connected between the inner wall 16 and the outer wall 17 of the annular sleeve. Several sealing plates 18 are fixedly connected between two adjacent gas branch pipes 2. The sealing plates 18 are located inside the inlet pipe 25.

[0030] Combustible gas enters from the main gas pipe 4 into the branch gas pipe 2, and then from the branch gas pipe 2 into the gas passage between the inner wall 16 and the outer wall 17 of the annular sleeve. The baffle 15 divides the gas passage into independent channels. The gas outlet end of the gas passage is the gas outlet 5, which is flat-nozzle shaped. Air enters from the air inlet 1. The sealing plate 18 ensures that air can only pass through the inner wall 16 of the annular sleeve. The sealing plate 18, the branch gas pipe 2, and the inner wall 16 of the annular sleeve form a tapering structure. After the air passes through the inner wall 16 of the annular sleeve, the air velocity increases and the pressure decreases. At the same time, high-pressure gas is ejected from the gas outlet 5, converting pressure energy into kinetic energy. The pressure decreases, and they will form a low-pressure zone in the premixing chamber 7. Due to the existence of the low-pressure zone, air that has not entered the premixing chamber 7 will be drawn in and mixed in the premixing chamber 7.

[0031] The scheme has been further optimized by installing a louvered cyclone separator 8 inside the premixing chamber 7.

[0032] The mixed gas passes through the louvered cyclone separator 8 and then enters the diffuser chamber 9 for thorough mixing.

[0033] The scheme is further optimized. The water-cooled pipe bank 12 includes several water-cooled pipes 24. The water-cooled pipes 24 are fixedly connected to the diffuser chamber 9. The two ends of the water-cooled pipes 24 are respectively connected to the upper header 11 and the lower header 13 of the water-cooled pipe bank. A vent plate is fixedly connected between two adjacent water-cooled pipes 24. Several air holes are opened on the vent plate.

[0034] The water-cooled tube 24 is filled with water. The mixed gas reaches the furnace (not shown in the figure) through the vent. It is ignited by the ignition device and burns. The mixed gas burns on the surface of the water-cooled tube 24, thus enabling heat exchange.

[0035] The design is further optimized. The vent plate includes an air inlet plate 19 and a flow guide plate 23. The air inlet plate 19 and the flow guide plate 23 are located on both sides of the water cooling pipe 24. The air holes include a first air inlet 22 and a second air inlet 20. The first air inlet 22 is opened on the flow guide plate 23, and the second air inlet 20 is opened on the air inlet plate 19.

[0036] The gas channel 21 is located between the inlet plate 19 and the guide plate 23. The mixed gas enters the gas channel 21 through the first inlet 22, and then enters the furnace (not shown in the figure) through the second inlet 20. It is ignited and burned by the ignition device, forming surface combustion on the surface of the water-cooled tube bank 12. The flame temperature is reduced by heat exchange through the water-cooled tube 24, thereby achieving stable combustion, reducing the generation of nitrogen oxides, and also cooling the guide plate 23 and the inlet plate 19.

[0037] The working principle of this device is as follows: Air from the blower (not shown) enters the intake pipe 25 through the air inlet 1. After passing through the inner wall 16 of the annular sleeve, the air velocity increases and the pressure decreases. At the same time, high-pressure gas is ejected from the gas passage between the inner wall 16 and the outer wall 17 of the annular sleeve, converting pressure energy into kinetic energy. The pressure decreases, and they will form a low-pressure zone in the premixing chamber 7. Due to the existence of the low-pressure zone, air that has not entered the premixing chamber 7 will be drawn in and mixed in the premixing chamber 7. The mixed gas enters the diffuser 9 through the louvered cyclone separator 8 for thorough mixing and conversion of kinetic energy into pressure energy. The mixed gas continues to flow forward, is guided by the guide plate 23, and enters the first intake hole 22. Then, it enters the second intake hole 20 through the gas passage 21 and is injected into the furnace. After being ignited by the ignition device, it forms surface combustion on the surface of the water-cooled tube bank 12. The flame temperature is reduced by the heat exchange of the water-cooled tube bank 12, thereby achieving stable combustion and reducing the generation of nitrogen oxides. It also cools the guide plate 23 and the intake plate 19.

[0038] Advantages of this device:

[0039] 1. The design of the louvered cyclone separator 8 serves to equalize flow and prevent backfire. At the same time, when the premixed gas passes through, a reflux zone is formed again in the diffuser zone, making the mixing more uniform.

[0040] 2. The design of the diffuser chamber 9 reduces the flow rate of the premixed gas and increases the pressure, which allows the premixed gas to be ignited smoothly.

[0041] 3. The design of the gas branch pipe 2, sealing plate 18 and annular sleeve 3 constitutes a tapered structure. After the air passes through, the flow rate increases and the pressure decreases, forming a low-pressure zone in the premixing chamber to guide the flow and make the gas mix evenly.

[0042] 4. The gradually expanding premixing chamber 6 is designed as a gradually expanding type. This structure can reduce the gas flow rate and increase the pressure, forming a backflow, which allows the gas to stay in the premixing chamber 7 for a longer time and mix more evenly. It can also reduce the size of the premixing chamber.

[0043] 5. Arranging the main gas pipe 4 and the branch gas pipe 2 in a ring can make the gas distribution more even.

[0044] 6. The design of the water-cooled tube array 12 can reduce the flame temperature, reduce the generation of nitrogen oxides, and make the flame combustion more stable.

[0045] In this embodiment, the flow guide plate 23 is V-shaped, such as Figure 4 As shown, in other embodiments, the flow guide plate 23 can also be flat, such as... Figure 5 As shown.

[0046] In this embodiment, the water-cooled pipe array is U-shaped, such as... Figure 1 As shown, in other embodiments, the water-cooled pipe array 12 can also be V-shaped, such as... Figure 6 and Figure 7 As shown, the water-cooled pipe bank 12 can also be arranged in a cylindrical shape, such as... Figure 8 and Figure 9 As shown.

[0047] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0048] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A gradually expanding ejector fully premixed water-cooled burner, characterized in that... ,include: The burner body includes an air inlet pipe (25), an air inlet (1) on the air inlet pipe (25), a gradually expanding premixing box (6) fixedly connected inside the air inlet pipe (25), a gas nozzle fixedly connected to the upstream end of the gradually expanding premixing box (6), a premixing chamber (7) fixedly connected to the end of the gradually expanding premixing box (6) away from the gas nozzle, the air inlet (1), the gas nozzle, the gradually expanding premixing box (6) and the premixing chamber (7) are interconnected, the gas nozzle is connected to a gas main pipe (4), and a diffuser chamber (9) is fixedly connected to the end of the premixing chamber (7) away from the gas nozzle, and the premixing chamber (7) is connected to the diffuser chamber (9). A water cooling device, comprising a water cooling pipe bank (12), with an upper water cooling pipe bank header (11) and a lower water cooling pipe bank header (13) connected at both ends of the water cooling pipe bank (12). An outlet pipe (10) is connected to the upper water cooling pipe bank header (11), and an inlet pipe (14) is connected to the lower water cooling pipe bank header (13). The gas nozzle includes an annular sleeve (3) and several gas branch pipes (2). The annular sleeve (3) includes an inner wall (16) and an outer wall (17). The gas branch pipes (2) are fixedly connected to the inner wall (16) and the outer wall (17) of the annular sleeve. The cavity between the inner wall (16) and the outer wall (17) of the annular sleeve forms a gas channel. The gas channel is connected to the gas branch pipes (2). 2) The gas inlet pipe (25) extends out, the gas branch pipe (2) is fixedly connected to and communicates with the gas main pipe (4), the gas outlet direction of the gas branch pipe (2) is towards the downstream direction of the gas inlet pipe (25), a number of partitions (15) are fixedly connected between the inner wall (16) of the annular sleeve and the outer wall (17) of the annular sleeve, and a number of sealing plates (18) are fixedly connected between two adjacent gas branch pipes (2), and the sealing plates (18) are located inside the gas inlet pipe (25); The water-cooled pipe bank (12) includes several water-cooled pipes (24), the water-cooled pipes (24) are fixedly connected to the diffuser chamber (9), and the two ends of the water-cooled pipes (24) are respectively connected to the upper header (11) of the water-cooled pipe bank and the lower header (13) of the water-cooled pipe bank. A vent plate is fixedly connected between two adjacent water-cooled pipes (24), and several air holes are opened on the vent plate. The vent plate includes an air inlet plate (19) and a flow guide plate (23). The air inlet plate (19) and the flow guide plate (23) are located on both sides of the water cooling pipe (24). The air holes include a first air inlet (22) and a second air inlet (20). The first air inlet (22) is opened on the flow guide plate (23), and the second air inlet (20) is opened on the air inlet plate (19).

2. The gradually expanding ejector fully premixed water-cooled burner according to claim 1, characterized in that: A louvered hydrocyclone (8) is fixedly connected inside the premixing chamber (7).

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