Porcelain tunnel kiln production line

Abstract

The utility model relates to a kind of porcelain tunnel kiln production line, wherein porcelain tunnel kiln production line includes the tunnel kiln main part for firing porcelain and the multiple energy-saving efficient combustors of interval arrangement along the length direction of tunnel kiln main part being arranged on tunnel kiln main part, energy-saving efficient combustor includes outer sleeve, inner tube of insertion in outer sleeve and branch pipe of being arranged in the gap between outer sleeve and inner tube, the first side of the outer sleeve is equipped with the first inlet of the air into gap, the first end of the inner tube has the second inlet of the natural gas into, the first end of the branch pipe has the third inlet for the hydrogen gas containing into, the middle part of the inner tube is equipped with the fourth inlet of the second end port communication of branch pipe, the wall of tunnel kiln main part is equipped with channel, energy-saving efficient combustor is arranged in channel, and this porcelain tunnel kiln production line uses energy-saving efficient combustor, it is favorable to improve its combustion efficiency, reduce combustor use cost.

Description

Technical fields: This utility model relates to a porcelain production line, and more particularly to a porcelain tunnel kiln production line. Background technology: Currently, most burners used in porcelain firing employ natural gas or biodiesel as fuel, which results in high combustion costs and significant environmental pollution. For example, Chinese patent "A Temperature-Controlled Furnace for Porcelain Firing" (publication number CN109489422A) includes a furnace body, a chimney, a movable placement rack mechanism, and a gas system. The chimney is located at the back of the furnace body and is connected to the interior of the furnace body through a flue. The movable part includes a sliding track, a table-shaped frame with casters, and a support rack for placing the porcelain to be fired. Part of the sliding track is located directly below the furnace body, and part is located outside the furnace body, so that the table-shaped frame and the support rack can be pushed into the furnace body or pulled out of the furnace body. The gas system provides heat energy to the interior of the furnace body, and a temperature sensor is installed on the top of the furnace to monitor the temperature inside the furnace. Although this temperature-controlled furnace is beneficial for temperature control, it uses natural gas as fuel, which has the problems of high combustion costs and significant environmental pollution.

[0001] For example, the Chinese patent "A porcelain kiln using biodiesel as fuel" (publication number CN212158136U) includes a kiln body, a burner, an oil supply system, an atomization system, a combustion-supporting system, and a PLC controller. The atomization system includes an air compressor, a gas control solenoid valve, a pressure regulating valve, and a pressure gauge. A flue is set below the ground level of the kiln body, and a condenser is installed on the flue. An exhaust fan is installed on the flue after the condenser, and the flue after the exhaust fan is connected to an exhaust gas purification system. Although this patent can stabilize fuel pressure and meet the requirements for safe production, the use of biodiesel as fuel has the problems of high combustion costs and significant environmental pollution. Summary of the Invention: In view of the above-mentioned shortcomings of the prior art, the purpose of this utility model is to provide a porcelain tunnel kiln production line that uses an energy-saving and high-efficiency burner, which is conducive to improving its combustion efficiency and reducing the burner's operating costs.

[0002] This utility model relates to a porcelain tunnel kiln production line, characterized in that it includes a tunnel kiln body for firing porcelain and multiple energy-efficient burners arranged at intervals along the length of the tunnel kiln body. Each energy-efficient burner includes an outer casing, an inner tube extending into the outer casing, and a branch pipe passing through the gap between the outer casing and the inner tube. The first side of the outer casing has a first inlet for introducing air into the gap. The first end of the inner tube has a second inlet for introducing natural gas. The first end of the branch pipe has a third inlet for introducing hydrogen gas. The middle of the inner tube has a fourth inlet communicating with the second end of the branch pipe. A hydrogen-natural gas mixing chamber is formed within the inner tube between the fourth inlet and the second end of the inner tube. A hydrogen-natural gas-air mixing chamber is formed within the outer casing between the second end of the outer casing and the second end of the inner tube. An ignition needle is provided at the second end of the inner tube to ignite the hydrogen-natural gas-air mixing chamber. The wall of the tunnel kiln body has channels through which the outer casing of the energy-efficient burner passes, with the second end of the outer casing facing the combustion chamber of the tunnel kiln body.

[0003] Preferably, a negative pressure generating mechanism is connected in series in the middle of the inner tube. The negative pressure generating mechanism includes a first pipe joint and a second pipe joint that are coaxially connected to each other. The first end of the first pipe joint has a reduced-diameter stepped shaft with an external thread and a pointed cone. The first end of the second pipe joint has an internal threaded hole and an internal conical surface. The fourth inlet is provided on the wall of the internal threaded hole. After the external thread on the reduced-diameter stepped shaft is coaxially threaded with the internal threaded hole of the second pipe joint, the pointed cone and the internal conical surface of the pointed cone are parallel and spaced apart, and the gap between the pointed cone and the internal conical surface is directly opposite the fourth inlet.

[0004] Preferably, the second pipe fitting body is provided with a cylindrical surface and a reverse conical surface that are sequentially connected to the inner conical surface.

[0005] Preferably, the first and second pipe joints are welded and fixed after being threaded together at their opposite first ends, the second end of the branch pipe is welded and fixed to the fourth inlet, and the second ends of the first and second pipe joints, which are opposite to each other, are coaxially welded and connected to the inner pipe.

[0006] Preferably, a flame arrester is connected in series on the aforementioned branch pipe.

[0007] Preferably, a gas guide block is sleeved on the second end of the inner tube. The center of the gas guide block has a through hole that is fixedly sleeved on the second end of the inner tube. The outer periphery of the gas guide block is sleeved on the inner wall of the outer tube. The ignition needle is fixedly installed on the gas guide block. The gas guide block has gas guide holes evenly distributed on it. The gas guide holes are inclined along the axial direction of the inner tube so that the air in the gap is spirally introduced into the hydrogen-natural gas-air mixing chamber.

[0008] Preferably, the second end port of the inner tube is provided with an inner tube cover, and the inner tube cover is radially evenly distributed with vent holes to input the hydrogen-natural gas mixture in the hydrogen-natural gas mixing chamber into the hydrogen-natural gas-air mixing chamber, and the outlet end of the vent hole is directly opposite the outlet end of the gas guide hole.

[0009] Preferably, the outer casing wall at the location of the hydrogen-natural gas-air mixing chamber is cone-shaped.

[0010] Preferably, the aforementioned air guide block is also connected to a sampling needle for collecting data on whether the ignition needle has successfully ignited.

[0011] Preferably, a first flange is fixedly provided on the wall of the outer tube between the first inlet and the second port. The first flange is used to fix and connect with the main body of the equipment. A second flange is provided on the first port of the outer tube. A third flange is fixedly provided on the first end of the inner tube to mate with the second flange. The relative fixation of the inner tube and the outer tube is achieved by connecting the second flange and the third flange.

[0012] When the energy-efficient burner starts up, air is introduced through the first inlet, natural gas through the second inlet, and hydrogen-containing gas through the third inlet. The hydrogen-containing gas and natural gas are mixed in the hydrogen-natural gas mixing chamber and then fed into the hydrogen-natural gas-air mixing chamber, where they mix with the introduced air. At this time, the ignition needle ignites the combustible gas in the hydrogen-natural gas-air mixing chamber, thereby heating the combustion chamber of the tunnel kiln body. After the heating temperature reaches the predetermined value, the supply of hydrogen-containing gas through the third inlet is first disconnected, and then the supply of natural gas through the second inlet is disconnected.

[0013] The production process of this utility model porcelain tunnel kiln production line is divided into three stages: preheating section, firing section, and cooling section. The preheating section accounts for 30-45% of the total kiln length, and the temperature rises from room temperature to 900℃. The firing section accounts for 10-33% of the total kiln length, and the temperature rises from 900℃ to the maximum firing temperature of 1320℃. The cooling section accounts for 38-46%. In terms of temperature control, the temperature in the firing section is controlled at the target value of 1320℃±4℃. In terms of pressure, the pressure difference between the two ends of the firing section is maintained at ±1.5Pa to prevent air inflow or flue gas leakage.

[0014] The cooling section is divided into a rapid cooling zone, a slow cooling zone, and a fast cooling zone. The rapid cooling zone cools from the firing temperature to 700℃ at a rate of 120℃ / h to maintain the glass phase. The slow cooling zone cools from 700-400℃ at a rate of less than 80-90℃ / h to avoid crystal transformation cracking. The fast cooling zone cools from 400-80℃ by forced air cooling.

[0015] The advantages of this utility model of a porcelain tunnel kiln production line are as follows: First, the energy-saving and high-efficiency burner of this porcelain tunnel kiln production line can improve the flame propagation speed by introducing hydrogen-containing gas through the branch pipe, thus compensating for the slow combustion speed of natural gas; second, it improves combustion characteristics, expands the combustion limit and extends the lean-burn limit, thereby improving combustion efficiency and reducing combustion costs; third, it enhances environmental performance, as hydrogen combustion only produces water, which can reduce pollutant emissions. Under the same calorific value conditions, when the hydrogen content is 10% and 20% (referring to the hydrogen content in the total volume of hydrogen and natural gas), the carbon emission reduction is 3.5% and 7.6% respectively, and NOx emissions are reduced by 30%-50%. Attached image description: Figure 1 This is a schematic cross-sectional view of the porcelain tunnel kiln production line of this utility model; Figure 2 This is a schematic diagram of the main view cross-sectional structure of the energy-saving and high-efficiency burner used in the porcelain tunnel kiln production line of this utility model; Figure 3 , 4 yes Figure 2 A partial view; Figure 5 yes Figure 3 A partial view; Figure 6 yes Figure 4 A partial view; Figure 7 yes Figure 5 Exploded view; Figure 8 yes Figure 7 K-direction view; Figure 9 This is a schematic diagram of the cross-sectional structure connecting the energy-efficient burner to the tunnel kiln production line of porcelain. Detailed implementation method: It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be pointed out that the following detailed description is exemplary and intended to provide further explanation of the present application; unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0016] This utility model of a porcelain tunnel kiln production line includes a tunnel kiln body A1 for firing porcelain and multiple energy-saving and high-efficiency burners 01 arranged at intervals along the length of the tunnel kiln body. The wall of the tunnel kiln body is provided with a channel A2, and the outer sleeve 1 of the energy-saving and high-efficiency burner passes through the channel, with the second end of the outer sleeve 1 facing the combustion chamber A3 of the tunnel kiln body.

[0017] In the combustion chamber A3 of the main body A1 of the tunnel kiln, there is a track A4 and multiple moving cars A5 that move intermittently on the track. The moving cars A5 are loaded with porcelain to be fired. The intermittent movement of the moving cars A5 can be driven by a chain conveyor mechanism on the track.

[0018] The energy-saving and high-efficiency burner 01 includes an outer tube 1, an inner tube 2 extending into the outer tube 1, and a branch tube 4 passing through the gap 3 between the outer tube and the inner tube. The outer tube 1, the inner tube 2, and the branch tube 4 can be made of high-temperature resistant metal materials.

[0019] The outer casing 1 has a first inlet 5 on its first side for introducing air into the gap 3. This first inlet 5 can be connected to a blower or similar equipment via a pipeline. The first end of the inner casing 2 has a second inlet 6 for introducing natural gas. This second inlet 6 can be connected to a natural gas supply tank or supply pipeline via a pipeline. The first end of the branch pipe 4 has a third inlet 7 for introducing hydrogen gas (which can be 100% pure hydrogen or a mixture containing some impurities or other gases, such as a hydrogen-oxygen mixture). The first end of this branch pipe can be connected to hydrogen production equipment or a hydrogen supply tank via a pipeline. The first side or first end of the outer casing 1, inner casing 2, and branch pipe 4 are all located at... Figure 1 Positioned on the left side, the second side or second end of the outer sleeve 1, inner sleeve 2, and branch sleeve 4 are all located in... Figure 1 The position is on the right side of the center.

[0020] The inner tube 2 has a fourth inlet 8 in the middle that is connected to the second end port of the branch tube 4. The inner tube 2 is located between the fourth inlet 8 and the second end port of the inner tube to form a hydrogen-natural gas mixing chamber 9. Hydrogen gas enters the inner tube 2 and the hydrogen-natural gas mixing chamber 9 through the fourth inlet 8.

[0021] The body of the outer tube 1 forms a hydrogen-natural gas-air mixing chamber 10 between the second end port of the outer tube 1 and the second end port of the inner tube. The hydrogen-natural gas mixture output from the second end port of the inner tube mixes with the air introduced into the gap 3 in the hydrogen-natural gas-air mixing chamber 10 to form a hydrogen-natural gas-air mixture.

[0022] An ignition needle 11 is provided at the second end of the inner tube to ignite the hydrogen-natural gas-air mixing chamber. The ignition needle 11 is connected to the outside of the first end of the inner tube by a wire passing through the gap 3. Ignition occurs when the ignition controller sends a signal to the ignition needle 11. The ignition needle 11 and the ignition controller are both commercially available components, and their structure and working principle will not be described in detail here.

[0023] A negative pressure generating mechanism 12 is connected in series in the middle of the inner pipe 2. The negative pressure generating mechanism includes a first pipe joint 13 and a second pipe joint 14 that are coaxially connected. The center of the first pipe joint 13 and the second pipe joint 14 has a central channel for natural gas to pass through. The first end of the first pipe joint 13 has a reduced-diameter stepped shaft 15, which is provided with an external thread 16 and a pointed cone 17. The first end of the second pipe joint 14 has an internal threaded hole 18 and an internal conical surface 19. The fourth inlet 8 is provided on the wall of the internal threaded hole 18. The external thread on the reduced-diameter stepped shaft... After the thread 16 is coaxially threaded to the inner threaded hole of the second pipe joint, the pointed cone surface 171 and the inner cone surface 19 of the pointed cone head are set parallel and spaced apart, and the gap area 20 between the pointed cone surface 171 and the inner cone surface 19 is directly opposite to the fourth inlet 8. In use, natural gas passes through the central channel, and hydrogen-containing gas is introduced through the fourth inlet 8. The flow rate and velocity of natural gas and hydrogen-containing gas can be the same or different. The velocity can be provided by the external gas supply pipeline, or the larger flow rate and velocity of natural gas can drive the hydrogen-containing gas into the mixing chamber.

[0024] The second pipe connector body may be provided with a cylindrical surface 21 and a reverse conical surface 22 connected in sequence to the inner conical surface. The hydrogen-containing gas can be guided into the mixing chamber (hydrogen-natural gas mixing chamber 9) through the pointed conical surface 171, the inner conical surface 19, the cylindrical surface 21 and the reverse conical surface 22.

[0025] The specific connection structure between the first pipe joint 13 and the second pipe joint 14 and the inner pipe is as follows: the first pipe joint 13 and the second pipe joint 14 are threaded together at their opposite first ends and then fixed by welding. The second end port of the branch pipe 4 is welded and fixed to the fourth inlet 8. The second ends of the first pipe joint 13 and the second pipe joint 14 that are opposite to each other are coaxially connected in series and welded to the inner pipe, so that the inner pipe forms a continuous pipeline.

[0026] To prevent combustion gases from entering the branch pipe due to pressure changes in the mixing chamber or combustion chamber, a flame arrester 23 is connected in series on the branch pipe. The flame arrester 23 is a commercially available component and is used to prevent the flame from flashing back into the branch pipe 4 through which hydrogen-containing gas flows, causing an explosion.

[0027] To facilitate thorough gas mixing, a gas guide block 24 is fitted onto the second end of the inner tube 2. The center of the gas guide block has a through hole that is fixedly fitted onto the second end of the inner tube. The outer circumference of the gas guide block fits onto the inner wall of the outer tube. The ignition needle 11 passes through and is fixedly installed on the gas guide block 24. The gas guide block is evenly distributed with gas guide holes 25, which can be circular or rectangular. Multiple gas guide holes 25 can be arranged in one or two circles on the gas guide block 24. The length direction of the gas guide holes is inclined along the axial direction of the inner tube. The inclined gas guide holes 25 can allow the air in the gap to be introduced into the hydrogen-natural gas-air mixing chamber in a spiral manner. This arrangement of the gas guide holes 25 helps to make the air mix more evenly with natural gas and hydrogen.

[0028] In addition, to further achieve better gas mixing, an inner tube cover 26 is provided at the second end port of the inner tube. Multiple air passage holes 27 are radially evenly distributed on the inner tube cover 26. The air passage holes 27 are located on the tube wall at the opening of the inner tube cover 26. The axis of the air passage holes 27 is perpendicular to the axis of the inner tube. The air passage holes 27 input the hydrogen-natural gas mixture in the hydrogen-natural gas mixing chamber to the hydrogen-natural gas-air mixing chamber. The outlet end of the air passage hole 27 is directly opposite the outlet end of the air guide hole 25, so that the spiral output air and the hydrogen-natural gas mixture are mixed more evenly. The inner tube cover 26 can be fitted onto the second end port of the inner tube with an interference fit. Multiple channels are evenly distributed on the second end port of the inner tube, which are directly opposite the air passage holes (each channel makes the second end port of the inner tube serrated). The air and the hydrogen-natural gas mixture mix with the air after passing through the channels and air passage holes.

[0029] For a reasonable design, the outer casing wall at the position of the hydrogen-natural gas-air mixing chamber is conical with a taper of 8-12 degrees, and the outer casing wall at the position of gap 3 is conical with a taper of 1-2 degrees.

[0030] To test whether ignition is complete, a sampling needle 28 is also connected to the gas guide block to collect data on whether the ignition needle has successfully ignited. This sampling needle 28 is also connected to the outside of the inner tube and to the ignition controller via a circuit to detect whether the ignition needle has successfully ignited. The ignition controller collecting data on whether ignition is successful is existing technology and will not be described in detail here.

[0031] To facilitate the installation of various components, a first flange 29 is fixedly installed on the wall of the outer tube 1 between the first inlet 5 and the second port. This first flange is used to fix and connect with the main body of the equipment (such as the wall of the equipment). A second flange 30 is provided on the first port of the outer tube, and a third flange 31 that mates with the second flange 30 is fixedly installed on the first end of the inner tube 2. The relative fixation of the inner tube and the outer tube is achieved by connecting the second flange and the third flange.

[0032] When the energy-efficient burner starts up, air is introduced through the first inlet 5, natural gas through the second inlet 6, and hydrogen-containing gas through the third inlet 7. The hydrogen-containing gas and natural gas are mixed in the hydrogen-natural gas mixing chamber 9, and then introduced into the hydrogen-natural gas-air mixing chamber 10 to mix with the introduced air. At this time, the ignition needle 11 ignites the combustible gas in the hydrogen-natural gas-air mixing chamber, thereby heating the combustion chamber A3 of the tunnel kiln body A1. After the heating temperature reaches the predetermined temperature value, the introduction of hydrogen-containing gas through the third inlet 7 is disconnected first, and then the introduction of natural gas through the second inlet 6 is disconnected.

[0033] The advantages of this utility model of a porcelain tunnel kiln production line are as follows: First, the energy-saving and high-efficiency burner of this porcelain tunnel kiln production line can improve the flame propagation speed by introducing hydrogen-containing gas through the branch pipe, thus compensating for the slow combustion speed of natural gas; second, it improves combustion characteristics, expands the combustion limit and extends the lean-burn limit, thereby improving combustion efficiency and reducing combustion costs; third, it enhances environmental performance, as hydrogen combustion only produces water, which can reduce pollutant emissions. Under the same calorific value conditions, when the hydrogen content is 10% and 20% (referring to the hydrogen content in the total volume of hydrogen and natural gas), the carbon emission reduction is 3.5% and 7.6% respectively, and NOx emissions are reduced by 30%-50%.

[0034] Energy-efficient and high-efficiency burners are applied to porcelain tunnel kiln production lines. Different proportions of hydrogen-containing gas are introduced into the energy-efficient and high-efficiency burners, which can reduce the cost of combustion under the condition of producing the same calorific value.

[0035] 1. When hydrogen accounts for 10% of the volume of the natural gas-hydrogen mixture: It can reduce natural gas consumption by about 12%. Based on the cost of natural gas of 3 yuan / m³ and hydrogen of 1 yuan / m³, the cost reduction is 8%-10%. Environmental benefits: CO2 emissions are reduced by 3.5% and NOx by about 20%.

[0036] 2. When hydrogen accounts for 20% of the volume of the natural gas-hydrogen mixture: Natural gas consumption can be reduced by 15%-25%, and the cost of mixed gas can be reduced to 2.7 yuan / m³, a cost reduction of 15%-20%; environmental benefits: CO2 emissions are reduced by 5%, and NOx emissions are reduced by about 23%.

[0037] 3. When hydrogen accounts for 30% of the volume of the natural gas-hydrogen mixture: Natural gas consumption can be reduced by 25%-30%, and fuel costs can be reduced by 20%-25%.

[0038] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A porcelain tunnel kiln production line, characterized in that: The system includes a tunnel kiln body for firing porcelain and multiple energy-efficient burners spaced apart along the length of the tunnel kiln body. Each energy-efficient burner includes an outer casing, an inner tube extending into the outer casing, and a branch pipe passing through the gap between the outer casing and the inner tube. The first side of the outer casing has a first inlet for introducing air into the gap. The first end of the inner tube has a second inlet for introducing natural gas. The first end of the branch pipe has a third inlet for introducing hydrogen gas. The middle of the inner tube has a fourth inlet communicating with the second end of the branch pipe. A hydrogen-natural gas mixing chamber is formed within the inner tube between the fourth inlet and the second end of the inner tube. A hydrogen-natural gas-air mixing chamber is formed within the outer casing between the second end of the outer casing and the second end of the inner tube. An ignition needle is provided at the second end of the inner tube to ignite the hydrogen-natural gas-air mixing chamber. The tunnel kiln body has channels on its wall, and the outer casing of the energy-efficient burner passes through these channels with its second end facing the combustion chamber of the tunnel kiln body.

2. The porcelain tunnel kiln production line according to claim 1, characterized in that: A negative pressure generating mechanism is connected in series in the middle of the inner tube. The negative pressure generating mechanism includes a first pipe joint and a second pipe joint that are coaxially connected to each other. The first end of the first pipe joint has a reduced-diameter stepped shaft with an external thread and a pointed cone. The first end of the second pipe joint has an internal threaded hole and an internal conical surface. The fourth inlet is provided on the wall of the internal threaded hole. After the external thread on the reduced-diameter stepped shaft is coaxially threaded with the internal threaded hole of the second pipe joint, the pointed cone surface and the internal conical surface of the pointed cone are arranged parallel and spaced apart, and the gap between the pointed cone surface and the internal conical surface is directly opposite the fourth inlet.

3. The porcelain tunnel kiln production line according to claim 2, characterized in that: The second pipe fitting body has a cylindrical surface and a reverse conical surface that are sequentially connected to the inner conical surface.

4. The porcelain tunnel kiln production line according to claim 3, characterized in that: The first and second pipe joints are welded and fixed after being threaded together at their respective first ends. The second end of the branch pipe is welded and fixed to the fourth inlet. The second ends of the first and second pipe joints, which are opposite to each other, are coaxially welded and connected to the inner pipe.

5. The porcelain tunnel kiln production line according to claim 4, characterized in that: A flame arrester is connected in series on the branch pipe.

6. The porcelain tunnel kiln production line according to claim 1, 2, 3, 4 or 5, characterized in that: A gas guide block is fitted onto the second end of the inner tube. The center of the gas guide block has a through hole that is fixedly fitted onto the second end of the inner tube. The outer periphery of the gas guide block is fitted onto the inner wall of the outer tube. The ignition needle is fixedly installed on the gas guide block. The gas guide block has evenly distributed gas guide holes that are inclined along the axial direction of the inner tube so that the air in the gap is spirally introduced into the hydrogen-natural gas-air mixing chamber.

7. The porcelain tunnel kiln production line according to claim 6, characterized in that: The inner tube is provided with an inner tube cover at the second end port. The inner tube cover has radially distributed vent holes to input the hydrogen-natural gas mixture in the hydrogen-natural gas mixing chamber into the hydrogen-natural gas-air mixing chamber. The outlet end of the vent hole is directly opposite the outlet end of the gas guide hole.

8. The porcelain tunnel kiln production line according to claim 7, characterized in that: The outer casing wall is cone-shaped at the location of the hydrogen-natural gas-air mixing chamber.

9. The porcelain tunnel kiln production line according to claim 7, characterized in that: The gas guide block is also connected to a sampling needle for collecting data on whether the ignition needle has successfully ignited.

10. The porcelain tunnel kiln production line according to claim 7, characterized in that: A first flange is fixedly provided on the wall of the outer tube between the first inlet and the second port. The first flange is used to fix the connection with the main body of the equipment. A second flange is provided on the first port of the outer tube. A third flange is fixed on the first end of the inner tube to mate with the second flange. The relative fixation of the inner tube and the outer tube is achieved by connecting the second flange and the third flange.

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