A porous medium combustion head and a porous medium burner

Abstract

The present application provides a porous medium burner head and a porous medium burner, which belong to the field of gas combustion technology. The porous medium burner head includes a shell, a heat-conducting dense plate and a tail gas pipe. An air inlet is provided on the shell, and the shell has a through chamber, and the chamber includes a premixing zone, an anti-flashback zone, a reaction zone and a radiation zone which are sequentially connected along the air inlet direction, and the radiation zone is located on the side away from the air inlet. The heat-conducting dense plate is located in the radiation zone, and the heat-conducting dense plate is sealed with the shell to seal the end of the radiation zone away from the reaction zone. The tail gas pipe is connected to the shell outside the reaction zone, and the tail gas pipe is connected to the reaction zone. The burner head of this porous medium burner is provided with a heat-conducting dense plate at the end of the radiation zone, and a tail gas pipe is provided in the reaction zone to prevent the tail gas from entering the heating zone, so as to realize oxygen-free heating of the workpiece to be heated.

Description

Technical Field

[0001] The present application relates to the field of gas combustion technology, and in particular to a porous medium burner head and a porous medium burner. Background Art

[0002] Common gas burners provide convection heating and radiation heating of high-temperature flue gas through free flame combustion. This gas combustion method causes a large temperature gradient near the flame surface, extremely uneven temperature distribution, unstable combustion, and leads to local high temperature and incomplete combustion. The local high temperature causes the generation of a large amount of thermal nitrogen oxides, and the incomplete combustion causes the generation of a large amount of carbon monoxide, which in turn causes pollutant emissions to fail to meet standards.

[0003] At the same time, in order to achieve heating of workpieces in an oxygen-free environment, radiant tubes are generally used for heating. The combustion process of the gas is placed in the radiant tube, and the workpiece is heated by the high-temperature radiation of the radiant tube. However, the radiant tubes used in the radiant tube heating technology are expensive, which increases the manufacturing cost.

[0004] In view of the above problems existing in free flame combustion, the porous medium combustion method is adopted to enhance the flame stability, increase the combustion rate, evenly distribute the temperature in the combustion zone, and reduce the emission of combustion pollutants.

[0005] However, the smoke generated by the combustion of the porous medium will be discharged into the heating zone, and oxygen-free heating of the workpiece to be heated cannot be achieved. Summary of the invention

[0006] The purpose of the present application is to provide a porous medium burner head and a porous medium burner, which can prevent smoke from entering the heating zone to achieve oxygen-free heating of the object to be heated.

[0007] In the first aspect, the embodiment of the present application provides a porous medium burner head, including a shell, a heat-conducting dense plate and a tail gas pipe. An air inlet is provided on the shell, and the shell has a through chamber, and the chamber includes a premixing zone, an anti-flashback zone, a reaction zone and a radiation zone which are sequentially connected along the air inlet direction, and the radiation zone is located on the side away from the air inlet. The heat-conducting dense plate is located in the radiation zone, and the heat-conducting dense plate is sealed and connected to the shell, and is used to seal the end of the radiation zone away from the reaction zone. The tail gas pipe is connected to the shell outside the reaction zone, and the tail gas pipe is connected to the reaction zone.

[0008] After the fuel gas and the oxygen-containing gas are mixed in the premixing zone, they enter the anti-flashback zone and then enter the reaction zone for combustion. The heat is radiated into the heating zone through the heat-conducting dense plate in the radiation zone to heat the object to be heated. After the heat-conducting dense plate is connected to the shell, the end of the radiation zone away from the reaction zone can be sealed, and the shell outside the reaction zone is connected with a tail gas pipe. The tail gas generated in the reaction zone can be discharged from the tail gas pipe, which can prevent the tail gas from passing through the radiation zone into the heating zone, so as to prevent the tail gas from contacting the object to be heated, so as to achieve oxygen-free heating of the object to be heated.

[0009] In a possible implementation, the emissivity of the thermally conductive dense plate is not less than 0.7, and the thickness of the thermally conductive dense plate is 10-50 mm.

[0010] By limiting the emissivity and thickness of the heat-conducting dense plate, the heat generated in the reaction zone can pass through the heat-conducting dense plate in the radiation zone, allowing the heat to enter the heating zone on the side of the radiation zone away from the reaction zone, so as to heat the object to be heated in the heating zone and achieve uniform heating.

[0011] In a possible implementation, the thermally conductive dense plate is an aluminum oxide ceramic plate, a zirconium oxide ceramic plate or a silicon carbide ceramic plate.

[0012] The use of the above materials to prepare the heat-conducting dense plate can make the radiation effect of the heat-conducting dense plate better and prevent the exhaust gas from entering the heating area.

[0013] In a possible implementation manner, the heat-conductive dense plate is substantially opposite to the air inlet.

[0014] The gas enters the reaction zone vertically and undergoes a combustion reaction. After the combustion reaction, as subsequent gas continues to enter the reaction zone for reaction, the heat generated by the previous reaction can be pushed toward the radiation zone, allowing more heat to pass through the heat-conducting dense plate into the heating zone, resulting in a higher heat utilization rate.

[0015] In a possible implementation, there are four tail gas pipes, which are all connected to the shell and arranged at intervals along the circumference of the shell.

[0016] After the gas enters the reaction zone and burns, the exhaust gas diffuses to the surroundings, so that the reaction zone is filled with gas and the combustion in the reaction zone is more uniform, so that the temperature of the surface of the radiation zone away from the reaction zone is more uniform, and the object to be heated can be heated evenly.

[0017] In a possible implementation, the porous medium burner head further includes a porous plate, which is located in the reaction zone and connected to the shell; the porous plate is fitted with the dense plate or there is a gap between the porous plate and the dense plate.

[0018] Combustion in the holes of the porous plate can make the combustion in the reaction zone more uniform and the flame more stable. If the porous plate fits the heat-conducting dense plate, the heat generated after combustion can be directly conducted out through the heat-conducting dense plate, and the heat utilization rate is higher. If there is a gap between the porous plate and the heat-conducting dense plate, the heat generated after combustion in the reaction zone will be evenly distributed in the gap between the porous plate and the heat-conducting dense plate as the exhaust gas flows, and then conducted out through the heat-conducting dense plate, and the heat distribution will be more uniform.

[0019] In a possible embodiment, the porous plate includes a first orifice plate and a second orifice plate, the first orifice plate and the second orifice plate are both located in the reaction zone, the first orifice plate and the second orifice plate are both connected to the shell, the aperture of the first orifice plate is smaller than the aperture of the second orifice plate, the first orifice plate is located on the side of the second orifice plate away from the heat-conducting dense plate, and the tail gas pipe is connected to the shell outside the second orifice plate. The second orifice plate is fitted with the heat-conducting dense plate or there is a gap between the second orifice plate and the heat-conducting dense plate.

[0020] The aperture of the first orifice plate is small, and the aperture of the second orifice plate is large. The second orifice plate is close to the radiation zone, and the first orifice plate is close to the anti-flashback zone. After the gas passes through the first orifice plate, it burns at the second orifice plate with a larger aperture, and the combustion is more complete. The flame after combustion is not easy to pass through the first orifice plate with a smaller aperture, and has a certain flashback effect, so that most of the combustion takes place in the second orifice plate, and a small part takes place in the first orifice plate, and the combustion is more complete.

[0021] In a possible implementation, the diameter of the small holes in the first orifice plate is 0.2 mm-3 mm, and the diameter of the large holes in the second orifice plate is 3 mm-7 mm; the porosity of the first orifice plate and the second orifice plate is 10%-80%.

[0022] The apertures of the first orifice plate and the second orifice plate are limited so that the gas burns in the holes of the second orifice plate and the possibility of the flame passing through the first orifice plate is reduced to a certain extent, thus having a certain backfire effect.

[0023] In a possible implementation, the burner head further includes an anti-flashback disk and a uniform distribution disk. The anti-flashback disk is located in the anti-flashback zone and connected to the shell. The uniform distribution disk is located in the premixing zone and connected to the shell.

[0024] The setting of the anti-flashback disk can effectively prevent the flame from entering the premixing zone, prevent the gas entering from the air inlet from burning in the premixing zone, and improve the safety of the porous medium burner head. The setting of the uniform distribution disk can make the mixed gas evenly enter the reaction zone for combustion.

[0025] In a second aspect, an embodiment of the present application provides a porous medium burner, comprising an ignition electrode, a temperature measuring electrode, a flame detection electrode and the above-mentioned porous medium burner head, wherein the ignition electrode, the temperature measuring electrode and the flame detection electrode are all arranged in a reaction zone.

[0026] The gas in the reaction zone is burned by the ignition electrode, and the temperature in the reaction zone can be detected by the temperature measuring electrode, and whether the combustion in the reaction zone is in progress can be detected by the flame detection electrode. At the same time, the arrangement of the porous medium burner head can prevent the exhaust gas from contacting the object to be heated, so as to achieve oxygen-free heating of the object to be heated. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, without paying any creative work, other related drawings can be obtained based on these drawings and they also belong to the protection scope of the present application.

[0028] Figure 1 A first structural schematic diagram of a porous medium burner head provided in an embodiment of the present application;

[0029] Figure 2 A second structural schematic diagram of a porous medium burner head provided in an embodiment of the present application;

[0030] Figure 3 A third structural schematic diagram of a porous medium burner head provided in an embodiment of the present application;

[0031] Figure 4 This is a fourth structural schematic diagram of the porous medium burner head provided in an embodiment of the present application.

[0032] Icons: 10-porous medium combustion head; 11-shell; 111-air inlet; 112-premixing zone; 113-anti-flashback zone; 114-reaction zone; 115-radiation zone; 116-heating zone; 12-gas guide plate; 13-heat-conducting dense plate; 14-porous plate; 15-anti-flashback plate; 16-uniformly distributed plate; 141-first orifice plate; 142-second orifice plate; 17-exhaust pipe. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0034] The porous medium burner comprises an ignition electrode, a temperature measuring electrode, a flame detection electrode and a porous medium combustion head 10 . Figure 1 A first structural schematic diagram of a porous medium burner head 10 provided in an embodiment of the present application; Figure 2 A second structural schematic diagram of the porous medium burner head 10 provided in an embodiment of the present application; Figure 3A third structural schematic diagram of the porous medium burner head 10 provided in an embodiment of the present application; Figure 4 This is a fourth structural schematic diagram of the porous medium burner head 10 provided in the embodiment of the present application. Figure 1-Figure 4 , wherein the porous medium burner head 10 includes a shell 11.

[0035] The shell 11 is made of heat-resistant alloy steel material, and is provided with an air inlet 111. The shell 11 has a through chamber, and the chamber includes a premixing zone 112, an anti-flashback zone 113, a reaction zone 114 and a radiation zone 115 which are sequentially connected along the air inlet direction. The radiation zone 115 is located on the side away from the air inlet 111, and the premixing zone 112 is located on the side close to the air inlet 111.

[0036] Optionally, the shell 11 is a rotating body structure, and both ends of the shell 11 are open structures, and one end opening can be used as an air inlet 111, so that the premixed gas can be passed into the chamber in the shell 11 from the air inlet 111. The premixed gas includes fuel gas and air, and the fuel gas and air can be burned after being mixed.

[0037] In this application example, please continue to refer to Figure 1 and Figure 2 The shell 11 is a cylindrical structure, one end (lower end) of the cylinder is an air inlet 111, and the chamber in the shell 11 is also cylindrical, and the premixed gas enters the chamber through the air inlet 111.

[0038] In another embodiment, please continue to refer to Figure 3 and Figure 4 The shell 11 is a cylindrical structure, and the lower end of the shell 11 gradually shrinks to form a small-diameter air inlet 111. If the air inlet 111 has a small diameter, the premixed gas may not be evenly distributed in the premixing zone 112 when it enters the chamber, which will make the gas not burn evenly in the subsequent process. Therefore, a gas guide plate 12 is provided at the air inlet 111.

[0039] Please continue reading Figure 3 The peripheral wall of the gas guide plate 12 is connected to the inner wall of the shell 11, and through holes are evenly distributed on the gas guide plate 12. Along the circumferential direction of the gas guide plate 12, the aperture of the through hole gradually decreases from the outside to the inside. Or along the circumferential direction of the gas guide plate 12, the number of through holes is gradually reduced from the outside to the inside. So that the premixed gas entering from the air inlet 111 can enter the premixing zone 112 after passing through the gas guide plate 12, and the part of the premixing zone 112 close to the shell 11 can also be filled with gas.

[0040] For other embodiments, please refer to Figure 4The gas guide disk 12 is spaced apart from the shell 11, and is connected to the shell 11 through a plurality of connectors (not shown, four, two or six connectors). No through holes are provided on the gas guide disk 12. After the premixed gas enters from the air inlet 111, it enters the premixing zone 112 through the gap between the periphery of the gas guide disk 12 and the shell 11, so that the part of the premixing zone 112 close to the shell 11 can also be filled with gas.

[0041] In the embodiment of the present application, the porous medium burner head 10 further includes a heat-conducting dense plate 13, a porous plate 14, an anti-tempering disk 15 and a uniformly distributed disk 16. The heat-conducting dense plate 13, the porous plate 14, the anti-tempering disk 15 and the uniformly distributed disk 16 are arranged in layers and are all connected to the inner wall of the shell 11. There may be a gap between two adjacent plate-like structures, or they may be in close contact.

[0042] In the embodiment of the present application, the structure of the shell 11 is not necessarily a body of revolution, and the cross section of the shell 11 can also be square, oval, etc., which is not limited in the embodiment of the present application. Accordingly, the shapes of the heat-conducting dense plate 13, the porous plate 14, the anti-tempering disk 15 and the uniformly distributed disk 16 will also change with the structure of the shell 11, so that the heat-conducting dense plate 13, the porous plate 14, the anti-tempering disk 15 and the uniformly distributed disk 16 can be connected in the shell 11.

[0043] Furthermore, the heat conductive dense plate 13 is arranged in the radiation zone 115 of the chamber, the porous plate 14 is arranged in the reaction zone 114 of the chamber, the anti-flashback disk 15 is arranged in the anti-flashback zone 113 of the chamber, and the uniform distribution disk 16 is arranged in the premixing zone 112 of the chamber. In order to install the heat-conducting dense plate 13, the porous plate 14, the anti-tempering disk 15 and the uniformly distributed disk 16, a fire-resistant heat-insulating layer is arranged on the inner wall of the shell 11 (the fire-resistant heat-insulating layer is made of a fire-resistant heat-insulating material, for example: a fire-resistant heat-insulating fiber product available on the market - a fire-resistant heat-insulating cotton), and then a high-temperature resistant sealant (a high-temperature resistant sealant available on the market) is arranged on the fire-resistant heat-insulating layer. When connecting the heat-conducting dense plate 13, the porous plate 14, the anti-tempering disk 15 and the uniformly distributed disk 16, high-temperature resistant sealants are respectively arranged between the heat-conducting dense plate 13, the porous plate 14, the anti-tempering disk 15 and the uniformly distributed disk 16 and the shell 11 for sealing connection.

[0044] The premixed gas entering from the air inlet 111 can be evenly distributed in the premixing zone 112 after passing through the uniform distribution disk 16, so that the subsequent gas can be evenly burned. Optionally, a plurality of through holes are evenly arranged on the uniform distribution disk 16, and the aperture of the through holes on the uniform distribution disk 16 is about 1-5 mm. Since the aperture of the air inlet 111 is large, a large amount of premixed gas enters the front end of the premixing zone 112 through the air inlet 111 (before passing through the uniform distribution disk 16), and due to the through hole structure of the uniform distribution disk 16, the speed of the premixed gas passing through the uniform distribution disk 16 is relatively slow, so that a certain air pressure can be formed at the front end of the premixing zone 112, so that the premixed gas fills the front end of the premixing zone 112, and then evenly passes through the uniform distribution disk 16 to enter the rear end of the premixing zone 112, so that the subsequent premixed gas can be burned.

[0045] In the embodiment of the present application, the premixed gas is burned in the reaction zone 114, the porous plate 14 is located in the reaction zone 114, and the porous plate 14 is sealed and connected to the housing 11. The premixed gas is burned in the holes of the porous plate 14, which can make the combustion in the reaction zone 114 more uniform and the flame more stable.

[0046] Optionally, the porous plate 14 includes a first orifice plate 141 and a second orifice plate 142, the first orifice plate 141 and the second orifice plate 142 are both located in the reaction zone 114, the first orifice plate 141 and the second orifice plate 142 are fitted together, the first orifice plate 141 and the second orifice plate 142 are both connected to the shell 11, the aperture of the first orifice plate 141 is smaller than the aperture of the second orifice plate 142, the first orifice plate 141 is located on the side of the second orifice plate 142 away from the heat-conducting dense plate 13, and the exhaust pipe 17 is connected to the shell 11 outside the second orifice plate 142.

[0047] The structures of the first orifice plate 141 and the second orifice plate 142 include but are not limited to foam, honeycomb, array, fiber winding, etc. The aperture of the first orifice plate 141 is small, and the aperture of the second orifice plate 142 is large. The second orifice plate 142 is close to the radiation zone 115, and the first orifice plate 141 is close to the anti-flashback zone 113. After the gas passes through the first orifice plate 141, it burns at the second orifice plate 142 with a larger aperture, and the combustion is more complete. The flame after combustion is not easy to pass through the first orifice plate 141 with a smaller aperture, which has a certain flashback effect, so that most of the combustion is carried out in the second orifice plate 142, and a small part is carried out in the first orifice plate 141, and the combustion is more complete.

[0048] Optionally, the aperture of the small hole in the first orifice plate 141 is 0.2mm-3mm, for example, the aperture of the hole in the first orifice plate 141 is 0.2mm, 0.5mm, 1mm, 2mm or 3mm. The aperture of the large hole in the second orifice plate 142 is 3mm-7mm, for example, the aperture of the hole in the second orifice plate 142 is 3mm, 4mm, 5mm, 6mm or 7mm. The porosity of the first orifice plate 141 and the second orifice plate 142 is 10%-80%, for example, the porosity of the first orifice plate 141 and the second orifice plate 142 is 10%, 30%, 50%, 70% or 80%. So that the gas burns in the hole of the second orifice plate 142, and to a certain extent reduces the possibility of the flame passing through the first orifice plate 141, which has a certain tempering effect.

[0049] Furthermore, the materials of the first orifice plate 141 and the second orifice plate 142 include, but are not limited to, high temperature resistant materials such as alumina ceramics, zirconium oxide ceramics, silicon carbide ceramics, iron-chromium-aluminum alloys, chromium-nickel alloys, and tungsten alloys.

[0050] In the embodiment of the present application, the anti-flashback disk 15 can further reduce the flashback rate of the flame in the burner head. The anti-flashback disk 15 is connected to the shell 11. Through the setting of the anti-flashback disk 15, the flame can be effectively prevented from entering the premixing zone 112, and the gas entering from the air inlet 111 can be prevented from burning in the premixing zone 112, thereby improving the safety of the porous medium burner head 10.

[0051] The anti-tempering disk 15 is evenly provided with a plurality of through holes, and the aperture of the through holes on the anti-tempering disk 15 is approximately between 0.2 and 1 mm. The aperture of the anti-tempering disk 15 is smaller than the aperture of the uniformly distributed disk 16, which can prevent tempering.

[0052] In the embodiment of the present application, the heat-conducting dense plate 13 is located in the radiation zone 115, and the heat-conducting dense plate 13 is sealed and connected to the housing 11, and is used to seal the end of the radiation zone 115 away from the reaction zone 114. This can prevent the exhaust gas from passing through the radiation zone 115 and entering the heating zone 116 (see Figure 1-Figure 4 , above the radiation zone 115 is the heating zone 116) to achieve oxygen-free heating of the object to be heated.

[0053] At the same time, it is necessary to set a tail gas pipe 17 to discharge the tail gas. The tail gas pipe 17 is connected to the shell 11 outside the reaction zone 114, and the tail gas pipe 17 is in communication with the reaction zone 114. The tail gas generated in the reaction zone 114 can be discharged from the tail gas pipe 17 to avoid the tail gas from contacting the object to be heated, so as to achieve oxygen-free heating of the object to be heated.

[0054] In the embodiment of the present application, the emissivity of the heat-conducting dense plate 13 is not less than 0.7, and the thickness of the heat-conducting dense plate 13 is 10-50 mm. For example, the emissivity of the heat-conducting dense plate 13 is 0.70, 0.71, 0.72, 0.75 or 0.8. The thickness of the heat-conducting dense plate 13 is 10 mm, 20 mm, 30 mm, 40 mm or 50 mm.

[0055] By limiting the emissivity and thickness of the heat-conducting dense plate 13, the heat generated in the reaction zone 114 can pass through the heat-conducting dense plate 13 in the radiation zone 115 and enter the heating zone 116, so as to heat the object to be heated in the heating zone 116 and achieve uniform heating.

[0056] Optionally, the heat-conducting dense plate 13 is an alumina ceramic plate, a zirconium oxide ceramic plate or a silicon carbide ceramic plate. Using the above materials to prepare the heat-conducting dense plate 13 can make the heat-conducting dense plate 13 have a better radiation effect and prevent the exhaust gas from entering the heating zone 116.

[0057] Further, the porous plate 14 is fitted with the dense plate (see Figure 1 and Figure 3 ), that is to say: the second orifice plate 142 is in contact with the heat-conducting dense plate 13. Then the heat generated after combustion can be directly conducted out through the heat-conducting dense plate 13, and the heat utilization rate is higher.

[0058] In other embodiments, there is a gap between the porous plate 14 and the dense plate (see Figure 2 and Figure 4 ) That is to say: there is a gap between the second orifice plate 142 and the heat-conducting dense plate 13. The heat generated by the combustion in the reaction zone 114 will be evenly distributed in the gap between the second orifice plate 142 and the heat-conducting dense plate 13 as the exhaust gas flows, and then conducted out through the heat-conducting dense plate 13, so that the heat distribution is more even.

[0059] In the embodiment of the present application, the heat-conducting dense plate 13 is substantially opposite to the air inlet 111. The gas enters the reaction zone 114 vertically to undergo a combustion reaction, and after the combustion reaction, since the subsequent gas continues to enter the reaction zone 114 to react, the heat generated by the previous reaction can be pushed toward the radiation zone 115, so that more heat passes through the heat-conducting dense plate 13 and enters the heating zone 116, and the heat utilization rate is higher.

[0060] In the embodiment of the present application, there are four tail gas pipes 17, all of which are connected to the shell 11 outside the reaction zone 114 (optionally, the shell 11 outside the second orifice plate 142) and are arranged at intervals along the circumference of the shell 11. After the gas enters the reaction zone 114 for combustion, the tail gas diffuses to the surroundings, so that the reaction zone 114 is filled with gas, and the combustion of the reaction zone 114 is more uniform, so that the temperature of the surface of the radiation zone 115 away from the reaction zone 114 is more uniform, and the object to be heated can be heated evenly.

[0061] In other embodiments, there may be two or six tail gas pipes 17 to discharge the tail gas generated in the reaction zone 114. In order to further utilize the tail gas, in the embodiment of the present application, the tail gas can be heat exchanged with the premixed gas to utilize the heat in the tail gas and facilitate the subsequent combustion of the premixed gas.

[0062] Optionally, the extension direction of the tail gas pipe 17 is approximately perpendicular to the intake direction of the air inlet 111. After the premixed gas burns at the second orifice plate 142, the tail gas diffuses to the surroundings. The tail gas pipe 17 arranged in the horizontal direction can directly discharge the tail gas so that the subsequent combustion at the second orifice plate 142 can proceed smoothly. In the embodiment of the present application, the heat-conducting dense plate 13, the second orifice plate 142, the first orifice plate 141, the anti-backfire disk 15, and the uniformly distributed disk 16 are all arranged approximately in parallel. The heat-conducting dense plate 13, the second orifice plate 142, the first orifice plate 141, the anti-backfire disk 15, and the uniform distribution disk 16 are basically perpendicular to the inlet direction of the premixed gas, so that after the premixed gas enters the premixing zone 112, it evenly passes through the uniform distribution disk 16 and the anti-backfire disk 15, enters the first orifice plate 141 and the second orifice plate 142, and burns in the second orifice plate 142. The heat generated in the reaction zone 114 can evenly pass through the heat-conducting dense plate 13 to heat the object to be heated in the heating zone 116.

[0063] In the embodiment of the present application, in order to make the premixed gas burn in the reaction zone 114, the ignition electrode, the temperature measuring electrode and the flame detection electrode are all arranged in the reaction zone 114. The ignition electrode is used to make the gas in the reaction zone 114 burn, and then the temperature in the reaction zone 114 can be detected by the temperature measuring electrode, and whether the combustion in the reaction zone 114 is in progress can be detected by the flame detection electrode.

[0064] The porous medium burner can be used in an atmosphere protection furnace or an electrode baking furnace, etc., so as to heat the workpiece to be heated, avoid direct contact between the workpiece to be heated and the flue gas, and avoid oxidation damage.

[0065] The working principle of the porous medium burner provided in the embodiment of the present application is:

[0066] The premixed gas enters the premixing zone 112 through the air inlet 111, passes through the uniformly distributed plate 16 and the anti-tempering plate 15, and then enters the first orifice plate 141 and the second orifice plate 142, ignites the ignition electrode, and detects the flame generated in the reaction zone 114 through the flame detection electrode. The temperature in the reaction zone 114 is detected by the temperature measuring electrode. If the temperature is high, the amount of premixed gas entering the air inlet 111 can be reduced, and if the temperature is low, the amount of premixed gas entering the air inlet 111 can be increased. The heat generated in the reaction zone 114 generates stable infrared radiation through the heat-conducting dense plate 13 to perform infrared radiation heating on the workpiece to be heated in the heating zone 116, and can prevent smoke from entering the heating zone 116, and the smoke is discharged from the tail pipe 17.

[0067] The porous medium burner provided in the embodiment of the present application has the following beneficial effects:

[0068] (1) Compared with the free flame combustion technology, the porous medium combustion technology provided by the present application has the advantages of high thermal utilization rate, low pollutant emissions (ultra-low emissions of nitrogen oxides and carbon monoxide), and large load regulation ratio.

[0069] (2) Compared with the traditional free flame combustion technology, the porous medium burner provided in the present application can prevent the workpiece to be heated from contacting with the exhaust gas generated by the combustion, and can realize infrared radiation heating of the workpiece to be heated, thereby avoiding oxidation damage to the workpiece to be heated.

[0070] (3) Compared with the traditional radiant tube heating technology, the porous medium burner provided by the present application has a simple structure and does not require expensive heat-resistant alloy radiant tubes, thereby eliminating the restrictive influence of radiant tubes on workpiece heating technology and reducing costs.

[0071] (4) The porous medium burner provided in the present application can lead out the high-temperature exhaust gas generated by combustion for reuse, thereby achieving efficient utilization of energy.

[0072] (5) The porous medium burner provided in the present application has a simple structural configuration, strong operability, high safety, and low equipment investment cost.

[0073] The above is only a part of the embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A porous medium burner head, characterized in that: include: A shell, wherein an air inlet is arranged on the shell, and the shell has a through chamber, wherein the chamber comprises a premixing zone, an anti-flashback zone, a reaction zone and a radiation zone which are sequentially connected along the air inlet direction, wherein the radiation zone is located on a side away from the air inlet, and the lower end of the shell gradually contracts to form the air inlet; A heat-conducting dense plate, the heat-conducting dense plate is located in the radiation zone, the heat-conducting dense plate is sealed to the shell, and is used to seal the end of the radiation zone away from the reaction zone; A tail gas pipe, the tail gas pipe is connected to the shell outside the reaction zone, and the tail gas pipe is in communication with the reaction zone; A uniform distribution disk, the uniform distribution disk is located in the premixing zone, the uniform distribution disk is connected to the housing, a plurality of through holes are evenly arranged on the uniform distribution disk, and the aperture of the through holes on the uniform distribution disk is 1-5 mm; and A gas guide plate, the gas guide plate is arranged at the gas inlet; Among them, the peripheral wall of the gas guide plate is connected to the inner wall of the shell, and along the circumferential direction of the gas guide plate, the aperture of the through holes on the gas guide plate gradually decreases from the outside to the inside, or along the circumferential direction of the gas guide plate, the number of through holes on the gas guide plate gradually decreases from the outside to the inside.

2. The porous medium burner head according to claim 1, characterized in that: The emissivity of the heat-conducting dense plate is not less than 0.7, and the thickness of the heat-conducting dense plate is 10-50 mm.

3. The porous medium burner head according to claim 2, characterized in that: The heat-conducting dense plate is an aluminum oxide ceramic plate, a zirconium oxide ceramic plate or a silicon carbide ceramic plate.

4. The porous medium burner head according to claim 1, characterized in that: The heat-conducting dense plate faces the air inlet.

5. The porous medium burner head according to any one of claims 1 to 4, characterized in that: The four tail gas pipes are connected to the shell and arranged at intervals along the circumference of the shell.

6. The porous medium burner head according to any one of claims 1 to 4, characterized in that: The porous medium burner head further comprises a porous plate, the porous plate is located in the reaction zone, and the porous plate is connected to the shell; The porous plate is fitted with the heat-conducting dense plate or there is a gap between the porous plate and the heat-conducting dense plate.

7. The porous medium burner head according to claim 6, characterized in that: The porous plate comprises a first orifice plate and a second orifice plate, the first orifice plate and the second orifice plate are both located in the reaction zone, the first orifice plate and the second orifice plate are both connected to the shell, the aperture of the first orifice plate is smaller than the aperture of the second orifice plate, the first orifice plate is located on a side of the second orifice plate away from the heat-conducting dense plate, and the tail gas pipe is connected to the shell outside the second orifice plate; The second orifice plate is fitted with the heat-conducting dense plate or there is a gap between the second orifice plate and the heat-conducting dense plate.

8. The porous medium burner head according to claim 7, characterized in that: The diameter of the small holes in the first orifice plate is 0.2 mm-3 mm, and the diameter of the large holes in the second orifice plate is 3 mm-7 mm; the porosity of the first orifice plate and the second orifice plate is 10%-80%.

9. The porous medium burner head according to any one of claims 1 to 4, characterized in that: The burner head further comprises an anti-flashback disk, wherein the anti-flashback disk is located in the anti-flashback zone and is connected to the shell.

10. A porous medium burner, characterized in that: It comprises an ignition electrode, a temperature measuring electrode, a flame detection electrode and the porous medium burner head according to any one of claims 1 to 9, wherein the ignition electrode, the temperature measuring electrode and the flame detection electrode are all arranged in the reaction zone.

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