Combustion apparatus having a preheat burner and method of heating the same

Abstract

The application provides a combustion device with a preheating burner and a heating method thereof, and relates to the technical field of large component heat treatment. The burner is connected with the inside of the burner jacket through a positioner. The outer wall of the burner jacket is connected with the bottom of the inner furnace wall of the furnace body assembly. The outer wall of the burner jacket is respectively provided with a gas shunt, an air shunt and a backflow air channel. The inside of the burner is sequentially provided with a premixed combustion chamber, a gas chamber and a non-premixed combustion chamber. The bottom of the first heat storage chamber, the bottom of the second heat storage chamber, the top of the third heat storage chamber and the top of the fourth heat storage chamber are respectively provided with temperature measuring thermocouples. The heating method includes a premixed combustion method, a non-premixed combustion method of low-burning-point gas and a non-premixed combustion method of high-burning-point gas. The application can preheat air and gas, control the effective working space of the furnace cavity, select multiple different heating methods according to the process requirements and heat the workpiece in the furnace, so that the heating efficiency in the heat treatment is improved.

Description

Technical Field

[0001] This invention relates to the field of heat treatment technology for large components, and in particular to a combustion device with a preheating burner and its heating method. Background Technology

[0002] Currently, the heat treatment process for forgings requires large gas-fired furnaces for heating, consuming large amounts of gas and emitting significant amounts of waste gas, causing pollution. Existing regenerative burners can reduce energy waste and achieve heat recovery, but they also have some problems, such as uneven heating of the workpiece within the furnace due to alternating heating on both sides, and the inability to preheat only the air, not both air and gas. All current regenerative burners use a separate, non-premixed air-gas combustion method, but this combustion method, due to incomplete mixing, leads to problems such as low flame temperature, uneven furnace temperature, high regenerative temperature, incomplete combustion, large pollutant emissions, and low energy utilization. Different heating processes are required for different workpieces, making the use of a single-function gas-fired furnace inconvenient. Summary of the Invention

[0003] To address the problems existing in the prior art, this invention provides a combustion device with preheating burners and its heating method. By symmetrically arranging combined burners and preheating components on both sides of the inner furnace wall in the furnace body assembly, the workpiece in the furnace cavity is heated evenly. The air reversing valve and gas reversing valve in the gas reversing assembly automatically switch between three modes: premixed combustion, non-premixed combustion of low ignition point gas, and non-premixed combustion of high ignition point gas, thereby adapting to different heating needs, improving heating efficiency, making fuller use of waste heat, and saving energy.

[0004] The present invention provides a combustion device with a preheating burner, which includes a combined burner, a preheating component, a gas reversing component, and a furnace body component. The combined burner is located on the first side wall of the inner furnace wall in the furnace body assembly. It includes a burner jacket, a positioner, and a burner. The burner is connected to the inside of the burner jacket through the positioner. The outer wall of the burner jacket is connected to the bottom of the inner furnace wall in the furnace body assembly. The outer wall of the burner jacket is provided with a gas flow channel, an air flow channel, and a return gas channel. The inside of the burner is provided with a premixed combustion chamber, a gas chamber, and a non-premixed combustion chamber in sequence. The premixed combustion chamber is provided with a premixed anti-backflow fan. The premixed combustion chamber is connected to the first inlet of the furnace cavity in the furnace body assembly through a premixed combustion channel. The gas chamber is connected to the non-premixed combustion chamber through an acceleration port. The outlet of the non-premixed combustion chamber is connected to the second inlet of the furnace cavity in the furnace body assembly. The premixed gas inlet, premixed air inlet, non-premixed gas inlet, non-premixed air inlet, and high-temperature return gas channel are symmetrically distributed on both sides of the outer wall along the axis of the burner. The preheating assembly is located on the second side wall of the inner furnace wall in the furnace body assembly. It includes pipelines, a first regenerator, a second regenerator, a third regenerator, a fourth regenerator, a thermocouple, and a heat storage body. The return gas duct is connected to the first end of the first pipeline via a one-way valve. The air diversion duct is connected to the first end of the second pipeline via a one-way valve. The gas diversion duct is connected to the first end of the third pipeline via a one-way valve. The second end of the first pipeline is connected to the first connection port of the first regenerator. The third end of the first pipeline is connected to the first connection port of the second regenerator. The fourth end of the first pipeline is connected to the first connection port of the third regenerator. The fifth end of the first pipeline is connected to the first connection port of the fourth regenerator. The second end of the second pipeline is connected to the second connection port of the first regenerator. The third end of the second pipeline is connected to the second connection port of the second regenerator. The second end of the third pipeline is connected to the second connection port of the third regenerator. The third end of the third pipeline is connected to the second connection port of the fourth regenerator.

[0005] Preferably, in the preheating assembly, the third connection port of the first heat storage chamber, the third connection port of the second heat storage chamber, the second connection port of the third heat storage chamber, and the second connection port of the fourth heat storage chamber are respectively connected to the first ends of the fourth pipeline, the fifth pipeline, the sixth pipeline, and the seventh pipeline. The first heat storage chamber, the second heat storage chamber, the third heat storage chamber, and the fourth heat storage chamber are provided with heat storage bodies. The bottom of the first heat storage chamber, the bottom of the second heat storage chamber, the top of the third heat storage chamber, and the top of the fourth heat storage chamber are respectively provided with a first temperature measuring coupler, a second temperature measuring coupler, a third temperature measuring coupler, and a fourth temperature measuring coupler.

[0006] Preferably, the gas reversing assembly includes a control cabinet, an air inlet, a gas inlet, an exhaust gas outlet, an air reversing valve, a gas reversing valve, a first temperature sensor, a first control motor, a first rotating shaft, a second temperature sensor, a second control motor, and a second rotating shaft. The fixed end of the second control motor is connected to a first end of a fixed position on the control cabinet, and the fixed end of the first control motor is connected to a second end of a fixed position on the control cabinet. The output end of the second control motor is connected to a first end of the gas reversing valve via the second rotating shaft. The second end of the gas reversing valve is connected to a first end of the gas inlet, a third end of the gas reversing valve is connected to a first end of the exhaust gas outlet, a fourth end of the gas reversing valve is connected to a second end of the seventh pipeline, and a fifth end of the gas reversing valve is connected to a second end of the sixth pipeline. The first control motor's output end is connected to the first end of the air reversing valve via a first rotating shaft. The second end of the air reversing valve is connected to the second end of the air inlet. The third end of the air reversing valve is connected to the second end of the exhaust outlet. The fourth end of the air reversing valve is connected to the second end of the fifth pipeline. The fifth end of the air reversing valve is connected to the second end of the fourth pipeline. The control end of the first control motor is connected to the first end of the first temperature sensor. The control end of the second control motor is connected to the first end of the second temperature sensor. The second and third ends of the first temperature sensor are respectively connected to the first and second temperature measuring couplers via wires. The second and third ends of the second temperature sensor are respectively connected to the third and fourth temperature measuring couplers via wires.

[0007] Preferably, the furnace body assembly includes a liftable furnace top, a lifting motor, a traction line, an inner furnace wall, an outer furnace wall, a furnace top, and a furnace cavity. The inner furnace wall is inside the outer furnace wall, and the interior of the inner furnace wall is the furnace cavity. The tops of the inner furnace wall and the outer furnace wall are respectively connected to a first end and a second end of the furnace top. The output end of the lifting motor is connected to the liftable furnace top via the traction line, and the fixed end of the lifting motor is connected to a third end of the furnace top.

[0008] Preferably, the sixth end of the first pipeline is provided with four inlet ends that are connected to the furnace cavity.

[0009] Preferably, the first, second, third, and fourth temperature measuring couplers are symmetrically distributed in pairs.

[0010] In another aspect, the present invention provides a heating method for the aforementioned combustion apparatus having a preheating burner, comprising a premixed combustion method, a non-premixed combustion method for low ignition point fuel gas, and a non-premixed combustion method for high ignition point fuel gas.

[0011] Adjust the position of the liftable furnace top connected to the lifting motor according to the workpiece to be processed to obtain the volume of the furnace cavity matching the workpiece to be processed. If a premixed combustion method is required, adjust the positioner to put the combined burner in the first working state. At this time, the premixed gas inlet and the premixed air inlet are connected to the first inlet and the second inlet of the premixed combustion chamber, respectively, while the non-premixed gas inlet and the non-premixed air inlet are closed. Air and gas are introduced into the premixed combustion chamber of the burner in the combined burner through the air inlet and the gas inlet, respectively, and the mixed gas is ignited until the workpiece to be processed is heated.

[0012] If a non-premixed combustion method is required, the positioner is adjusted to put the combined burner in the second working state. In this state, the non-premixed gas inlet and the gas chamber inlet are connected, the non-premixed air inlet and the first inlet of the non-premixed combustion chamber are connected, and the premixed air inlet and the premixed gas inlet are closed. If a non-premixed combustion method using low-ignition-point gas is required, the first control motor and the first temperature sensor are started via the control cabinet, and the temperature difference value of the first temperature sensor is set. Air and gas are introduced into the non-premixed combustion chamber of the burner in the combined burner through the air inlet and gas inlet, respectively, and the mixture is ignited. Based on the comparison between the temperature measured by the first temperature sensor and the set temperature difference value, the first control motor connected to the first rotating shaft controls the air reversing valve to switch between the third and fourth working states until the workpiece is processed. Heating is complete. If a non-premixed combustion method using high-ignition-point gas is required, the first control motor, the second control motor, the first temperature sensor, and the second temperature sensor are activated via the control cabinet, and the temperature difference values ​​of the first and second temperature sensors are set. Air and gas are introduced into the non-premixed combustion chamber of the burner in the combined burner through the air inlet and the gas inlet, respectively, and the mixture is ignited. Based on the comparison between the temperature measured by the first temperature sensor and the set temperature difference value, the first control motor connected to the first rotating shaft controls the air reversing valve to switch between the third and fourth working states. Based on the comparison between the temperature measured by the second temperature sensor and the set temperature difference value, the second control motor connected to the second rotating shaft controls the gas reversing valve to switch between the third and fourth working states, until the workpiece to be processed is heated.

[0013] Preferably, in the non-premixed combustion method, the third operating state is: the air reversing valve and the fifth pipeline are connected, and the gas reversing valve and the seventh pipeline are connected.

[0014] Preferably, in the non-premixed combustion method, the fourth operating state is: the air reversing valve and the fourth pipeline are connected, and the gas reversing valve and the sixth pipeline are connected.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. The combustion device of the present invention preheats air and fuel gas and controls the effective working space of the furnace cavity, thereby improving the heating efficiency in heat treatment. At the same time, it utilizes waste heat through gas circulation within the furnace cavity, making waste heat utilization more efficient and controlling the effective working space of the furnace cavity to save fuel. According to the actual combustion conditions and the type of fuel gas used, it realizes the function switching between premixed combustion and non-premixed combustion, realizing various combustion forms such as premixed combustion, non-premixed combustion of low ignition point fuel gas, and non-premixed combustion of high ignition point fuel gas. It has the characteristics of wide applicability, large operating space, and flexible use.

[0017] 2. The combined burner of this invention overcomes the problem of uneven heating of the workpiece in the furnace caused by the alternating heating on both sides of the traditional regenerative burner. It ensures that each burner can burn independently and simultaneously, the heating flame state is adjustable, the workpiece is heated evenly, and the heating efficiency is high. At the same time, the ability to heat both sides is more convenient than alternating heating. The burner is equipped with independent premixed combustion chamber and non-premixed combustion chamber. The premixed anti-backflow fan can prevent explosions caused by uneven input gas temperature and can also prevent gas backflow in the furnace. The long premixed combustion channel can prevent gas backflow during premixed combustion and prevent the mixed gas from exploding. The high-temperature backflow gas channel design can minimize heat loss, and the acceleration port can increase the flow rate of the non-premixed gas and improve heating efficiency.

[0018] 3. The heat storage chamber of the preheating component of the present invention and the combustion chamber of the burner are independent, which can achieve the recycling, heat storage and cooling of exhaust gas, thereby saving energy, improving heating efficiency, reducing the temperature of exhaust gas, and reducing pollution.

[0019] 4. The furnace body assembly of the present invention adopts a liftable furnace top, which makes the furnace cavity volume variable. The furnace body structure with variable furnace cavity volume can greatly reduce the ineffective heating volume as needed, thereby saving gas and improving heating efficiency.

[0020] 5. The gas reversing components of the present invention are all automatically controlled by the control cabinet of the measurement and control equipment, automatically switching between premixed combustion mode and non-premixed combustion mode to adapt to different heating needs, save labor costs, and operate with precision.

[0021] 6. The heating method of the present invention is completed by a combination of burners, preheating itself and gas reversing itself, without the need for two burners to work together. Various different heating methods can be selected to heat the workpiece in the furnace cavity according to process requirements. Attached Figure Description

[0022] Figure 1 This is a front view of the combustion device with a preheating burner according to the present invention;

[0023] Figure 2 This is a left view of the combustion device with a preheating burner according to the present invention;

[0024] Figure 3 This is a top view of the combustion device with a preheating burner according to the present invention;

[0025] Figure 4 This is a cross-sectional view of the regenerator chamber in the combustion device with a preheating burner of the present invention;

[0026] Figure 5 This is a schematic diagram of the first working state of the combustion device with a preheating burner according to the present invention;

[0027] Figure 6 This is a schematic diagram of the second operating state of the combustion device with a preheating burner according to the present invention;

[0028] Figure 7 This is a schematic diagram of the third operating state of the combustion device with a preheating burner according to the present invention;

[0029] Figure 8 This is a schematic diagram of the fourth operating state of the combustion device with a preheating burner according to the present invention;

[0030] Figure 9 This is a first axonometric view of the combined burner in the combustion device with a preheating burner of the present invention;

[0031] Figure 10 This is a second isometric view of the combined burner in the combustion device with a preheating burner of the present invention;

[0032] Figure 11 This is a diagram showing the connection relationship between the combined burner, preheating assembly, and gas reversing assembly in the combustion device with a preheating burner of the present invention.

[0033] Figure 12 This is a schematic flowchart of the heating method of the combustion device with a preheating burner according to the present invention.

[0034] Key reference numerals:

[0035] Burner jacket 1, gas splitter 101, air splitter 102, return air duct 103, positioner 2, burner 3, premixed combustion chamber 301, premixed anti-backflow fan 302, premixed combustion channel 303, gas chamber 304, non-premixed combustion chamber 305, acceleration port 306, premixed gas inlet 307, premixed air inlet 308, non-premixed gas inlet 309, non-premixed air inlet 310, high-temperature return air duct 311, first pipeline 4, second pipeline 5, third pipeline 6, one-way valve 7, first heat storage chamber 8, second heat storage chamber 9, third heat storage chamber 10, fourth heat storage chamber 11, first temperature measuring coupler 801, second temperature measuring coupler 90 1. Third temperature measuring coupler 1001, fourth temperature measuring coupler 1101, heat storage body 12, wire 13, fourth pipeline 14, fifth pipeline 15, sixth pipeline 16, seventh pipeline 17, control cabinet 1801, air inlet 18, gas inlet 19, exhaust gas outlet 20, air reversing valve 21, first temperature sensor 2101, first control motor 2102, first rotating shaft 2103, gas reversing valve 22, second temperature sensor 2201, second control motor 2202, second rotating shaft 2203, liftable furnace top 23, lifting motor 24, traction line 2401, inner furnace wall 25, outer furnace wall 26, furnace top 27, furnace cavity 28. Detailed Implementation

[0036] To fully describe the technical content, structural features, objectives, and effects of this invention, a detailed description will be provided below in conjunction with the accompanying drawings.

[0037] Combustion devices with preheating burners, such as Figure 1 As shown, the invention includes a combined burner that performs multiple combustion functions, a preheating component that preheats air and fuel gas, a gas reversing component that reverses the flow of air, fuel gas and exhaust gas, and a furnace body component with variable furnace volume. The combined burner, the preheating component and the gas reversing component constitute the gas circulation structure path of the invention.

[0038] The combined burner is located on the first side wall of the inner furnace wall 25 in the furnace body assembly, such as... Figure 9 and Figure 10 As shown, the assembly includes a burner jacket 1, a positioner 2, and a burner 3. The burner 3 is internally connected to the burner jacket 1 via the positioner 2. The burner 3 is restricted by the positioner 2 and can slide axially within the burner jacket 1. The positioner 2 is marked with a calibration indicator, which can be used to adjust the position of the burner 3 to the first working state and the second working state. The outer wall of the burner jacket 1 is connected to the bottom of the inner furnace wall 25 in the furnace body assembly. The outer wall of the burner jacket 1 is provided with a gas diversion channel 101, an air diversion channel 102, and a return gas channel 103. The burner 3 is internally provided with a premixed combustion chamber 301, a gas chamber 304, and a non-premixed combustion chamber 305.

[0039] The premixed combustion chamber 301 is equipped with a premixed anti-backflow fan 302. The premixed combustion chamber 301 is connected to the first inlet of the furnace cavity 28 in the furnace body assembly through the premixed combustion channel 303. The gas chamber 304 is connected to the non-premixed combustion chamber 305 through the acceleration port 306. The outlet of the non-premixed combustion chamber 305 is connected to the second inlet of the furnace cavity 28 in the furnace body assembly. The premixed gas inlet 307, the premixed air inlet 308, the non-premixed gas inlet 309, the non-premixed air inlet 310 and the high-temperature backflow channel 311 are symmetrically distributed on both sides of the outer wall along the axis of the burner 3.

[0040] Furthermore, to ensure uniform gas mixing and enhance the safety of the heating method, the premixed anti-backflow fan 302 begins to rotate when gas and air enter through the premixed gas inlet 307 and premixed air inlet 308, creating an airflow that moves towards the premixed combustion channel 303. This accelerates gas mixing and the entry of the mixed gas into the furnace chamber 28, preventing gas backflow and potential explosions. The relatively long premixed combustion channel 303 also helps reduce gas backflow to some extent. The acceleration inlet 306 accelerates gas flow when gas from the gas chamber 304 enters the non-premixed combustion chamber 301. Both the non-premixed air inlet 310 and the high-temperature backflow channel 311 are wedge-shaped inlets, which further accelerate gas flow and combustion.

[0041] The preheating component is a combined structure, located on the second side wall of the inner furnace wall 25 within the furnace body assembly, such as... Figure 4 and Figure 11 As shown, the system includes a first pipeline 4, a second pipeline 5, a third pipeline 6, a one-way valve 7, a first heat storage chamber 8, a second heat storage chamber 9, a third heat storage chamber 10, a fourth heat storage chamber 11, a first temperature measuring coupler 801, a second temperature measuring coupler 901, a third temperature measuring coupler 1001, a fourth temperature measuring coupler 1101, a heat storage body 12, a wire 13, a fourth pipeline 14, a fifth pipeline 15, a sixth pipeline 16, and a seventh pipeline 17. The one-way valve 7 controls the flow direction of the airflow to prevent gas backflow. The temperature inside the heat storage chamber is monitored by the temperature measuring couplers, and the process can be automatically adjusted based on the temperature feedback from the temperature sensors.

[0042] The return gas duct 103 is connected to the first end of the first pipeline 4 via a one-way valve 7. The gas splitting duct 101 is connected to the first end of the second pipeline 5 via a one-way valve 7. The air splitting duct 102 is connected to the first end of the third pipeline 6 via a one-way valve 7. The second end of the first pipeline 4 is connected to the first connection port of the first heat storage chamber 8. The third end of the first pipeline 4 is connected to the first connection port of the second heat storage chamber 9 for exhaust gas discharge and air heat storage. The fourth end of the first pipeline 4 is connected to the first connection port of the third heat storage chamber 9. The fifth end of the first pipeline 4 is connected to the first connection port of the fourth heat storage chamber 10 for exhaust gas discharge and gas heat storage. The second end of the second pipeline 5 is connected to the second connection port of the first heat storage chamber 8. The third end of the second pipeline 5 is connected to the second connection port of the second heat storage chamber 9. The second end of the third pipeline 6 is connected to the third heat storage chamber 10. The first connection port of 10 is connected, the third end of the third pipe 6 is connected to the first connection port of the fourth heat storage chamber 11, the third connection port of the first heat storage chamber 8 is connected to the first end of the fourth pipe 14, the third connection port of the second heat storage chamber 9 is connected to the first end of the fifth pipe 15, the second connection port of the third heat storage chamber 10 is connected to the first end of the sixth pipe 16, and the second connection port of the fourth heat storage chamber 11 is connected to the first end of the seventh pipe 17. The interiors of the first heat storage chamber 8, the second heat storage chamber 9, the third heat storage chamber 10, and the fourth heat storage chamber 11 are independent of each other and each is provided with a heat storage body 12. The bottom of the first heat storage chamber 8, the bottom of the second heat storage chamber 9, the top of the third heat storage chamber 10, and the top of the fourth heat storage chamber 11 are respectively provided with a first temperature measuring coupler 801, a second temperature measuring coupler 901, a third temperature measuring coupler 1001, and a fourth temperature measuring coupler 1101.

[0043] The gas reversing assembly is a combined structure located on the outer side of the outer furnace wall 26, such as... Figure 2 and Figure 3 As shown, it includes a control cabinet 1801, an air inlet 18, a gas inlet 19, an exhaust outlet 20, an air reversing valve 21, a gas reversing valve 22, a first temperature sensor 2101, a first control motor 2102, a first rotating shaft 2103, a second temperature sensor 2201, a second control motor 2202, and a second rotating shaft 2203. The first temperature sensor 2101 and the second temperature sensor 2201 can be set to have a temperature difference.

[0044] The airflow direction changes in the first heat storage chamber 8 and the second heat storage chamber 9 are measured by the first thermocouple 801 and the second thermocouple 901, respectively. When the internal temperature difference reaches a set threshold, it is fed back to the first temperature sensor 2101 via the wire 13. The first temperature sensor 2101 controls the first control motor 2102 to drive the first rotating shaft 2103 to change from the first working state to the second working state. The airflow direction changes in the third heat storage chamber 10 and the fourth heat storage chamber 11 are measured by the third thermocouple 1001 and the fourth thermocouple 1101, respectively. When the internal temperature difference reaches a set threshold, it is fed back to the second temperature sensor 2201 via the wire. The second temperature sensor 2201 controls the second control motor 2202 to drive the second rotating shaft 2203 to change from the first working state to the second working state.

[0045] The input ends of the gas inlet and exhaust outlet 20 extend out through the control cabinet 1801. The fixed ends of the first control motor 2102 and the second control motor 2202 are arranged symmetrically from top to bottom. The operation and control of the first control motor 2102, the first temperature sensor 2101, the second control motor 2202 and the second temperature sensor 2201 can all be performed through the control cabinet 1801.

[0046] The fixed end of the second control motor 2202 is connected to the first end of the fixed position of the control cabinet 1801. The fixed end of the first control motor 2102 is connected to the second end of the fixed position of the control cabinet 1801. The output end of the second control motor 2202 is connected to the first end of the gas reversing valve 22 via the second rotating shaft 2203. The second end of the gas reversing valve 22 is connected to the first end of the gas inlet 19. The third end of the gas reversing valve 22 is connected to the first end of the exhaust outlet 20. The fourth end of the gas reversing valve 22 is connected to the second end of the seventh pipeline 17. The fifth end of the gas reversing valve 22 is connected to the second end of the sixth pipeline 16. The output end of the first control motor 2102 is connected to the first end of the air reversing valve 21 via the first rotating shaft 2101. The second end of the air reversing valve 21... The first control motor 2102 is connected to the second end of the first temperature sensor 2101, the second control motor 2202 is connected to the first end of the second temperature sensor 2201, the second end of the first temperature sensor 2101 is connected to the second end of the second temperature sensor 2201, the second and third ends of the first temperature sensor 2101 are respectively connected to the first temperature measuring coupler 801 and the second temperature measuring coupler 901 through wires 13, and the second and third ends of the second temperature sensor 2201 are respectively connected to the third temperature measuring coupler 1001 and the fourth temperature measuring coupler 1101 through wires 13.

[0047] Furnace components, such as Figure 1 and Figure 3 As shown, the furnace includes a liftable furnace top 23, a lifting motor 24, a traction line 2401, an inner furnace wall 25, an outer furnace wall 26, a furnace top 27, and a furnace cavity 28. The inner furnace wall 25 is inside the outer furnace wall 26, and the interior of the inner furnace wall 25 is the furnace cavity 28. The tops of the inner furnace wall 25 and the outer furnace wall 26 are respectively connected to the first and second ends of the furnace top 27. The output end of the lifting motor 24 is connected to the liftable furnace top 23 through the traction line 2401. The liftable furnace top 23 moves vertically within the furnace cavity 28 under the action of the traction line 2401. Lifting the furnace top allows the volume of the furnace cavity 28 to be varied, which can greatly reduce the ineffective heating volume and save energy according to the needs of use. The fixed end of the lifting motor 24 is connected to the third end of the furnace top 27.

[0048] Specifically, the sixth end of the first pipe 4 is provided with four inlet ends connected to the furnace cavity 28. The inlet ends can operate independently when the volume of the furnace cavity 28 changes. Exhaust gas enters from the upper side of the inlet end, flows to the lower side of the inlet end for recirculation, and flows to the fourth and fifth ends of the first pipe 4 for exhaust. The first temperature measuring coupler 801, the second temperature measuring coupler 901, the third temperature measuring coupler 1001, and the fourth temperature measuring coupler 1101 are symmetrically distributed.

[0049] Another aspect of the present invention, such as Figure 12 As shown, the heating method of the combustion device with a preheating burner includes a premixed combustion method, a non-premixed combustion method for low ignition point gas, and a non-premixed combustion method for high ignition point gas. The combustion device of the present invention can switch functions according to different heating conditions and different gases. The combined burner can automatically switch between premixed combustion mode and non-premixed combustion mode through the gas reversing component, which can adapt to different heating needs and is convenient to use.

[0050] Adjust the position of the liftable furnace top 23 connected to the lifting motor 24 according to the workpiece to be processed, and obtain the volume of the furnace cavity 28 that matches the workpiece. If a premixed combustion method is required, adjust the positioner 2 to put the combined burner in the first working state. Figure 5 As shown, air and gas are introduced into the premixed combustion chamber of burner 3 in the combined burner through air inlet 18 and gas inlet 19, and the mixed gas is ignited until the workpiece to be processed is heated.

[0051] If a non-premixed combustion method is required, adjust positioner 2 to put the combined burner into the second operating state, such as... Figure 6As shown, if a non-premixed combustion method for low-ignition-point gas is required, the first control motor 2102 and the first temperature sensor 2101 are started via control cabinet 1801, and the temperature difference value of the first temperature sensor 2101 is set. Air and gas are introduced into the non-premixed combustion chamber 309 of burner 3 in the combined burner through air inlet 18 and gas inlet 19, respectively, and the mixture is ignited. Based on the comparison between the temperature measured by the first temperature sensor 2101 and the set temperature difference value, the first control motor 2102 connected to the first rotating shaft 2103 controls the air reversing valve 21 to switch between the third and fourth working states, as shown. Figure 7 and Figure 8 As shown, continue heating until the workpiece to be processed is completely heated.

[0052] Specifically, when the temperature difference between the first heat storage chamber 8 and the second heat storage chamber 9 reaches the set temperature difference within a certain period of time, that is, when the temperature difference between the first heat storage chamber 8 and the second heat storage chamber 9 measured by the first temperature measuring coupler 801 and the second temperature measuring coupler 901 reaches the set value, the first temperature sensor 2101 controls the first control motor 2102 to work, driving the first rotating shaft 2103 to switch the air reversing valve 21, changing from the third working state to the fourth working state; after the reversal, the temperature difference between the first heat storage chamber 8 and the second heat storage chamber 9 gradually decreases and then increases again, until the temperature difference reaches the set value again, the first temperature sensor 2101 controls the air reversing valve 21 to change from the fourth working state to the third working state, thus repeating to achieve air preheating until the heating is finished.

[0053] If a non-premixed combustion method for high-ignition-point gas is required, the first control motor 2102, the second control motor 2102, the first temperature sensor 2101, and the second temperature sensor 2202 are activated via control cabinet 1801, and the temperature difference values ​​of the first temperature sensor 2101 and the second temperature sensor 2102 are set respectively. Air and gas are introduced into the non-premixed combustion chamber 309 of burner 3 in the combined burner through air inlet 18 and gas inlet 19 respectively, and the mixture is ignited. Based on the comparison between the temperature measured by the first temperature sensor 2101 and the temperature difference value set in step S2, the first control motor 2102 connected to the first rotating shaft 2103 controls the air reversing valve 21 to switch between the third and fourth working states; based on the comparison between the temperature measured by the second temperature sensor 2201 and the temperature difference value set in step S2, the second control motor 2202 connected to the second rotating shaft 2203 controls the gas reversing valve 22 to switch between the third and fourth working states, as follows. Figure 7 and Figure 8 As shown, continue heating until the workpiece to be processed is completely heated.

[0054] like Figure 5As shown, the first working state is the premixed combustion mode: air inlet 18 is connected to the fifth pipe 15, gas inlet 19 is connected to the seventh pipe 17, exhaust outlet 20 is connected to the fourth pipe 14 and the sixth pipe 16 respectively, return gas duct 103 is connected to the high-temperature return gas duct 311, the outlet of air diversion channel 102 located on the inner furnace wall 25 is closed, the outlet located on the outer furnace wall 26 is connected to the premixed air inlet 308, the outlet of gas diversion channel 101 located on the inner furnace wall 25 is closed, the outlet located on the outer furnace wall 26 is connected to the premixed gas inlet 307, the premixed air inlet 308 and the premixed gas inlet 307 are connected to the premixed combustion chamber 301, the non-premixed gas inlet 309 and the non-premixed air inlet 310 are closed, and the premixed combustion chamber 301 is in operation, as shown. Figure 6 As shown, the second working state is the non-premixed combustion mode: air inlet 18 is connected to the fourth pipe 14, gas inlet 19 is connected to the sixth pipe 16, exhaust outlet 20 is connected to the seventh pipe 17 and the fifth pipe 15 respectively, return gas duct 103 is connected to the high-temperature return gas duct 311, air diversion channel 102 is connected to the outlet of the inner furnace wall 25 and the non-premixed gas inlet 309, and the outlet of the outer furnace wall 26 is closed, gas diversion channel 101 is connected to the outlet of the inner furnace wall 25 and the non-premixed gas inlet 309, and the outlet of the outer furnace wall 26 is closed, premixed air inlet 308 and premixed gas inlet 307 are closed, non-premixed gas inlet 309 is connected to the gas chamber 304, non-premixed air inlet 310 is connected to the non-premixed combustion chamber 305, and the non-premixed combustion chamber 305 is working. The high-temperature reflux port 311 is connected to the non-premixed combustion chamber 305 in both the first and second working states, serving as a high-temperature gas reflux port.

[0055] In non-premixed combustion methods, such as Figure 7 As shown, in the third operating state, the air reversing valve 21 and the fifth pipeline 15 are connected, and the gas reversing valve 22 and the seventh pipeline 17 are connected, as follows. Figure 8 As shown, in the fourth operating state, the air reversing valve 21 and the fourth pipeline 14 are connected, and the gas reversing valve 22 and the sixth pipeline 16 are connected. The first heat storage chamber 8 and the second heat storage chamber 9 are for air heat storage. Under the change between the third and fourth operating states, they alternately function as exhaust gas outlet heat storage and air inlet preheating. The third heat storage chamber 10 and the fourth heat storage chamber 11 are for gas heat storage. Under the change between the third and fourth operating states, they alternately function as exhaust gas outlet heat storage and gas inlet preheating.

[0056] In a preferred embodiment of the present invention, the first and second working states need to be manually adjusted, while the third and fourth working states are automatically adjusted.

[0057] The following describes in further detail a combustion device with a preheating burner and its heating method according to the present invention, with reference to embodiments:

[0058] This specific embodiment selects to preheat either gas or air based on actual conditions, and chooses one of three combustion methods for heating: premixed combustion method, non-premixed combustion method for low ignition point gas, and non-premixed combustion method for high ignition point gas.

[0059] Example 1: The premixed combustion method is implemented as follows:

[0060] Adjust the position of the liftable furnace top 23 connected to the lifting motor 24 according to the workpiece to be processed, obtain the volume of the furnace cavity 28 matching the workpiece to be processed, and adjust the positioner 2 to put the combined burner in the first working state, such as... Figure 5 As shown.

[0061] Air is introduced through air inlet 18 and gas is introduced through gas inlet 19. The air enters the fifth pipeline 15 through air reversing valve 21, then enters the second heat storage chamber 9, and enters the air distribution channel 102 through the second pipeline 5 from the lower end of the second heat storage chamber 9. At this time, the non-premixed air inlet 310 is closed, and the air enters the premixed air inlet 308 and then enters the premixed combustion chamber 301. The gas enters the seventh pipeline 17 through gas reversing valve 22 through gas inlet 19, and then enters the fourth heat storage chamber. The gas enters the gas distribution channel 101 from the lower end of the fourth regenerator 11 via the third pipeline 6. At this time, the non-premixed gas inlet 310 is closed, and the gas enters the premixed gas inlet 307 and then enters the premixed combustion chamber 301. The air and gas are fully mixed in the premixed combustion chamber 301, and the premixed anti-backflow fan 302 is blown to form an airflow towards the premixed combustion channel 303. At the same time, due to the great obstruction of the gas in the furnace cavity 28, it is difficult for the gas to flow back, and the gas at the outlet of the premixed combustion channel 303 is ignited and starts to work.

[0062] The exhaust gas from combustion in the furnace chamber 28 enters through the inlet at the sixth end of the first pipe 4. Part of it enters the furnace chamber 28 through the first end of the first pipe 4 via the return gas passage 103 and the high-temperature return gas passage 311 to complete heat recovery. The other part enters the first regenerator chamber 8 and the third regenerator chamber 10 through the second and fourth ends of the first pipe 4, respectively. After passing through the regenerator 12, the temperature of the exhaust gas is greatly reduced. It then enters the air reversing valve 21 and the gas reversing valve 22 through the fourth pipe 14 and the sixth pipe 16, and exits the furnace body through the exhaust gas outlet 20. This process continues until heating is complete.

[0063] The entire heating process does not involve preheating, and the energy-saving effect is relatively low under these conditions, but it can greatly reduce the temperature of the exhaust gas and reduce pollution.

[0064] Example 2: The non-premixed combustion method for low ignition point fuel gas is implemented as follows:

[0065] Adjust the position of the liftable furnace top 23 connected to the lifting motor 24 according to the workpiece to be processed, obtain the volume of the furnace cavity 28 matching the workpiece to be processed, and adjust the positioner 2 to put the combined burner into the second working state, such as... Figure 6 As shown.

[0066] When the temperature difference threshold is set to X, and the temperature difference measured by the first temperature measuring coupler 801 and the second temperature measuring coupler 901 is X, the first temperature sensor 2101 feeds back to the first control motor 2102 to control the air reversing valve 21 to switch, where X is the lowest temperature at which the exhaust gas is generated by combustion according to the process.

[0067] Air is introduced through air inlet 18 and gas inlet 19. Air enters the fifth pipeline 15 through air reversing valve 21, then enters the second heat storage chamber 9, and enters the air distribution channel 102 through the second pipeline 5 from the lower end of the second heat storage chamber 9. At this time, the premixed air inlet 308 is closed, and the air enters the non-premixed air inlet 310 and then enters the non-premixed combustion chamber 305. Gas enters the seventh pipeline 17 through gas reversing valve 22, then enters the fourth heat storage chamber 11, and enters the gas distribution channel 101 through the third pipeline 6 from the lower end of the fourth heat storage chamber 11. At this time, the premixed gas inlet 307 is closed, and the gas enters the non-premixed gas inlet 309 and then enters the gas chamber 304. The gas combines with air in the non-premixed combustion chamber 305 through acceleration port 306, and the gas is ignited to start working.

[0068] The exhaust gas from combustion in the furnace chamber 28 enters through the inlet at the sixth end of the first pipe 4. Part of it enters the furnace chamber 28 through the first end of the first pipe 4 via the return gas passage 103 and the high-temperature return gas passage 311 to complete heat recovery. The other part enters the first regenerator chamber 8 and the third regenerator chamber 10 through the second and fourth ends of the first pipe 4, respectively. After passing through the regenerator 12, the temperature of the exhaust gas is greatly reduced. It then enters the air reversing valve 21 and the gas reversing valve 22 through the fourth pipe 14 and the sixth pipe 16, and exits the furnace body through the exhaust gas outlet 20. This process continues until heating is complete.

[0069] When the temperature difference between the first heat storage chamber 8 and the second heat storage chamber 9 reaches X, the first temperature sensor 2101 controls the first control motor 2102 to adjust the air reversing valve 21 via the first rotating shaft 2103. At this time, the air inlet 18 is connected to the fourth pipeline 14 to enter the first heat storage chamber 8, and the exhaust gas outlet 20 is connected to the fifth pipeline 15 and the second heat storage chamber 9. The gas flow direction of the first heat storage chamber 8 and the second heat storage chamber 9 is exchanged. The air flowing through the first heat storage chamber 8 is preheated, and the exhaust gas flowing through the second heat storage chamber 9 continues to store heat. The temperature of the first heat storage chamber 8 decreases and the temperature of the second heat storage chamber 9 increases, and the temperature difference between the two gradually decreases. When the temperature difference between the first heat storage chamber 8 and the second heat storage chamber 9 reaches X again, the first temperature sensor 2101 controls the air reversing valve 21 to reverse again. This process is repeated to complete the preheating of the incoming air. Figure 7 and Figure 8 As shown.

[0070] The heating method in this embodiment can save gas and reduce the temperature of exhaust gas, thus reducing pollution.

[0071] Example 3: The non-premixed combustion method for high ignition point fuel gas is implemented as follows:

[0072] Adjust the position of the liftable furnace top 23 connected to the lifting motor 24 according to the workpiece to be processed, obtain the volume of the furnace cavity 28 matching the workpiece to be processed, and adjust the positioner 2 to put the combined burner into the second working state, such as... Figure 6 As shown.

[0073] After the control cabinet 1801 starts the first temperature sensor 2101 and the first control motor 2102, and sets the temperature difference threshold to X, when the temperature difference measured by the first temperature measuring coupler 801 and the second temperature measuring coupler 901 is X, the first temperature sensor 2101 feeds back to the first control motor 2102 to control the air reversing valve 21 to switch. After the control cabinet 1801 starts the second temperature sensor 2201 and the second control motor 2202, and sets the temperature difference threshold to Y, when the temperature difference measured by the third temperature measuring coupler 1001 and the fourth temperature measuring coupler 1101 is Y, the second temperature sensor 2201 feeds back to the second control motor 2202 to control the gas reversing valve 22 to switch. Here, X is the lowest temperature at which the exhaust gas is generated according to the process combustion, and Y is the lowest temperature at which the exhaust gas is generated according to the process combustion and is less than the ignition point of the gas.

[0074] Air is introduced through air inlet 18 and gas inlet 19. Air enters the fifth pipeline 15 through air reversing valve 21, then enters the second heat storage chamber 9, and enters the air distribution channel 102 through the second pipeline 5 from the lower end of the second heat storage chamber 9. At this time, the premixed air inlet 308 is closed, and the air enters the non-premixed air inlet 310 and then enters the non-premixed combustion chamber 305. Gas enters the seventh pipeline 17 through gas reversing valve 22, then enters the fourth heat storage chamber 11, and enters the gas distribution channel 101 through the third pipeline 6 from the lower end of the fourth heat storage chamber 11. At this time, the premixed gas inlet 307 is closed, and the gas enters the non-premixed gas inlet 309 and then enters the gas chamber 304. The gas combines with air in the non-premixed combustion chamber 305 through acceleration port 306, and the gas is ignited to start working.

[0075] The exhaust gas from combustion in the furnace chamber 28 enters through the inlet at the sixth end of the first pipe 4. Part of it enters the furnace chamber 28 through the first end of the first pipe 4 via the return gas passage 103 and the high-temperature return gas passage 311 to complete heat recovery. The other part enters the first regenerator chamber 8 and the third regenerator chamber 10 through the second and fourth ends of the first pipe 4, respectively. After passing through the regenerator 12, the temperature of the exhaust gas is greatly reduced. It then enters the air reversing valve 21 and the gas reversing valve 22 through the fourth pipe 14 and the sixth pipe 16, and exits the furnace body through the exhaust gas outlet 20. This process continues until heating is complete.

[0076] When the temperature difference between the first heat storage chamber 8 and the second heat storage chamber 9 reaches X, the first temperature sensor 2101 controls the first control motor 2102 to adjust the air reversing valve 21 via the first rotating shaft 2103. At this time, the air inlet 18 is connected to the fourth pipeline 14 to enter the first heat storage chamber 8, and the exhaust gas outlet 20 is connected to the fifth pipeline 15 and the second heat storage chamber 9. The gas flow direction of the first heat storage chamber 8 and the second heat storage chamber 9 is exchanged. The air flowing through the first heat storage chamber 8 is preheated, and the exhaust gas flowing through the second heat storage chamber 9 continues to store heat. The temperature of the first heat storage chamber 8 decreases and the temperature of the second heat storage chamber 9 increases, and the temperature difference between the two gradually decreases. When the temperature difference between the first heat storage chamber 8 and the second heat storage chamber 9 reaches X again, the first temperature sensor 2101 controls the air reversing valve 21 to reverse again. This process is repeated to complete the preheating of the incoming air. Figure 7 and Figure 8 As shown.

[0077] When the temperature difference between the third heat storage chamber 10 and the fourth heat storage chamber 11 reaches Y, the second temperature sensor 2201 controls the second control motor 2202 to adjust the gas reversing valve 22 via the second rotating shaft 2203. At this time, the gas inlet 19 connects to the sixth pipeline 16 and enters the third heat storage chamber 10, while the exhaust gas outlet 20 connects to the seventh pipeline 17 and the fourth heat storage chamber 11. The gas flow directions of the third heat storage chamber 10 and the fourth heat storage chamber 11 are exchanged. The gas flowing through the third heat storage chamber 10 is preheated, while the exhaust gas flowing through the fourth heat storage chamber 11 continues to store heat. The temperature of the third heat storage chamber 10 decreases, while the temperature of the fourth heat storage chamber 11 increases, and the temperature difference between the two gradually decreases. When the temperature difference reaches Y again, the second temperature sensor 2201 controls the gas reversing valve 22 to reverse again, repeating this process to complete the preheating of the incoming gas.

[0078] The heating method in this embodiment can save gas and reduce the temperature of exhaust gas, thus reducing pollution.

[0079] Example 4: A comparative experiment was conducted between a variable combustion chamber with a volume of 5m×2m×2m and a conventional gas-fired heat treatment furnace with the same furnace cavity volume:

[0080] The heating temperature is set to 1000℃. The temperature of the gas entering the heat storage chamber after the temperature inside the furnace cavity 28 stabilizes is detected in real time by the first temperature measuring coupler 801 and the third temperature measuring coupler 1001, and the temperature is recorded at the time of temperature detection.

[0081] Test 1: Under the same process, a traditional gas furnace takes about 1 hour to reach the set temperature. Under the operation of the method according to Example 1, the present invention takes about 55 minutes to reach the temperature without preheating, thanks to the acceleration of gas mixing by the premixed combustion chamber 301, the premixed anti-backflow fan 302 and the premixed combustion channel 303 in the combined burner, and the recovery of high-temperature waste gas by the first pipeline 4 and the high-temperature backflow gas channel 311.

[0082] Test 2: Under the operation of the method according to Example 1, the present invention accelerates gas mixing through the premixed combustion chamber 301, premixed anti-backflow fan 302 and premixed combustion channel 303 in the combined burner, and recovers high-temperature waste gas through the first pipeline 4 and high-temperature backflow gas channel 311. It takes 53 minutes to reach the temperature when the height of the furnace cavity 28 is controlled to be lowered by 10% by the liftable furnace top 23.

[0083] Test 3: Under the operation of the method according to Example 2, the present invention requires approximately 45 minutes to heat to the required temperature under the condition of single air preheating, through the interactive preheating effect of the first heat storage chamber 8 and the second heat storage chamber 9, the acceleration effect of the combustion gas in the combined burner internal acceleration port 306, and the recovery of high temperature waste gas by the first pipeline 4 and the high temperature return gas channel 311.

[0084] Test 4: Under the operation of the method according to Example 3, the present invention requires 40 minutes to reach the temperature under the condition of dual preheating of air and gas, through the interactive preheating of air by the first heat storage chamber 8 and the second heat storage chamber 9, the interactive preheating of gas by the third heat storage chamber 10 and the fourth heat storage chamber 11, the acceleration of gas by the acceleration port 306 in the heat storage chamber combined burner, and the recovery of high temperature waste gas by the first pipeline 4 and the high temperature return gas channel 311.

[0085] Comparisons of tests 1, 2, 3, and 4 show that this invention significantly improves heating efficiency. Different heating processes have varying effects, with the highest efficiency under dual preheating, followed by single air preheating, while the improvement in efficiency is not significant under no preheating. Generally, for every 100°C increase in preheated air temperature, the theoretical combustion temperature increases by approximately 50°C. Preheating allows for more complete combustion and more uniform heating, enabling the rational utilization of low-calorific-value fuel gas, improving combustion quality, reducing air consumption, lowering the air-fuel ratio, reducing flue gas volume, and minimizing heat loss carried away by the flue gas. Simultaneously, the relatively smaller furnace cavity volume (28) also reduces the heating space, improving efficiency. Therefore, the preheating component of this invention significantly improves heating efficiency, and the more preheated the gas, the more significant the efficiency improvement.

[0086] This invention significantly reduces the temperature of exhaust gases. According to previous studies, when a conventional combustion furnace operates at 1000℃, the heat carried away by the flue gas is 52% of the heat supplied by the fuel; at 1200℃, it is approximately 63%; and at 1400℃, it is approximately 74%. This means that the higher the combustion temperature, the greater the heat loss and the higher the exhaust gas temperature. In Test 1, the exhaust gas temperature emitted by a conventional gas furnace during heating was approximately 400-450℃, while the exhaust gas temperature emitted by this invention was approximately 250℃-300℃. It is evident that at the same furnace temperature, this invention can significantly reduce the temperature of exhaust gases, reducing pollution and simultaneously lowering exhaust gas treatment costs. Furthermore, the effect of reducing exhaust gas temperature is more significant than that of conventional gas furnaces at higher combustion temperatures.

[0087] The energy-saving method of this invention generally saves about 5% of fuel for every 100°C increase in air preheating temperature. Comparing Test 1 and Test 2, under conditions without preheating, the heating time is reduced by 5 minutes; Test 1 shows that reducing the furnace cavity height by 10% reduces the heating time by 2 minutes under the same conditions. Under the same air supply rate, the energy-saving effect of this invention is significant.

[0088] 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 combustion device with a preheating burner, comprising a combined burner, a preheating assembly, a gas reversing assembly, and a furnace body assembly, characterized in that, The combined burner is located on the first side wall of the inner furnace wall in the furnace body assembly. It includes a burner jacket, a positioner, and a burner. The burner is connected to the inside of the burner jacket through the positioner. The outer wall of the burner jacket is connected to the bottom of the inner furnace wall in the furnace body assembly. The outer wall of the burner jacket is provided with a gas flow channel, an air flow channel, and a return gas channel. The inside of the burner is provided with a premixed combustion chamber, a gas chamber, and a non-premixed combustion chamber in sequence. The premixed combustion chamber is provided with a premixed anti-backflow fan. The premixed combustion chamber is connected to the first inlet of the furnace cavity in the furnace body assembly through a premixed combustion channel. The gas chamber is connected to the non-premixed combustion chamber through an acceleration port. The outlet of the non-premixed combustion chamber is connected to the second inlet of the furnace cavity in the furnace body assembly. The premixed gas inlet, premixed air inlet, non-premixed gas inlet, non-premixed air inlet, and high-temperature return gas channel are symmetrically distributed on both sides of the outer wall along the axis of the burner. The preheating assembly is located on the second side wall of the inner furnace wall in the furnace body assembly. It includes pipelines, a first regenerator, a second regenerator, a third regenerator, a fourth regenerator, a thermocouple, and a heat storage body. The return gas duct is connected to the first end of the first pipeline via a one-way valve. The air diversion duct is connected to the first end of the second pipeline via a one-way valve. The gas diversion duct is connected to the first end of the third pipeline via a one-way valve. The second end of the first pipeline is connected to the first connection port of the first regenerator. The third end of the first pipeline is connected to the first connection port of the second regenerator. The fourth end of the first pipeline is connected to the first connection port of the third regenerator. The fifth end of the first pipeline is connected to the first connection port of the fourth regenerator. The second end of the second pipeline is connected to the second connection port of the first regenerator. The third end of the second pipeline is connected to the second connection port of the second regenerator. The second end of the third pipeline is connected to the second connection port of the third regenerator. The third end of the third pipeline is connected to the second connection port of the fourth regenerator.

2. The combustion device with a preheating burner according to claim 1, characterized in that, In the preheating assembly, the third connection port of the first heat storage chamber is connected to the first end of the fourth pipeline, the third connection port of the second heat storage chamber is connected to the first end of the fifth pipeline, the second connection port of the third heat storage chamber is connected to the first end of the sixth pipeline, and the second connection port of the fourth heat storage chamber is connected to the first end of the seventh pipeline. The first, second, third, and fourth heat storage chambers are equipped with heat storage bodies. The bottom of the first heat storage chamber, the bottom of the second heat storage chamber, the top of the third heat storage chamber, and the top of the fourth heat storage chamber are respectively equipped with a first temperature measuring coupler, a second temperature measuring coupler, a third temperature measuring coupler, and a fourth temperature measuring coupler.

3. The combustion device with a preheating burner according to claim 2, characterized in that, The gas reversing assembly includes a control cabinet, an air inlet, a gas inlet, an exhaust gas outlet, an air reversing valve, a gas reversing valve, a first temperature sensor, a first control motor, a first rotating shaft, a second temperature sensor, a second control motor, and a second rotating shaft. The fixed end of the second control motor is connected to a first end of a fixed position on the control cabinet. The fixed end of the first control motor is connected to a second end of a fixed position on the control cabinet. The output end of the second control motor is connected to a first end of the gas reversing valve via the second rotating shaft. The second end of the gas reversing valve is connected to a first end of the gas inlet. The third end of the gas reversing valve is connected to a first end of the exhaust gas outlet. The fourth end of the gas reversing valve is connected to a second end of a seventh pipeline. The fifth end of the gas reversing valve is connected to a second end of a sixth pipeline. The output end of the first control motor is connected to the first end of the air reversing valve via a first rotating shaft. The second end of the air reversing valve is connected to the second end of the air inlet. The third end of the air reversing valve is connected to the second end of the exhaust outlet. The fourth end of the air reversing valve is connected to the second end of the fifth pipeline. The fifth end of the air reversing valve is connected to the second end of the fourth pipeline. The control end of the first control motor is connected to the first end of the first temperature sensor. The control end of the second control motor is connected to the first end of the second temperature sensor. The second and third ends of the first temperature sensor are respectively connected to the first and second temperature measuring couplers via wires. The second and third ends of the second temperature sensor are respectively connected to the third and fourth temperature measuring couplers via wires.

4. The combustion device with a preheating burner according to claim 1, characterized in that, The furnace body assembly includes a liftable furnace top, a lifting motor, a traction line, an inner furnace wall, an outer furnace wall, a furnace top, and a furnace cavity. The inner furnace wall is inside the outer furnace wall, and the interior of the inner furnace wall is the furnace cavity. The tops of the inner furnace wall and the outer furnace wall are respectively connected to the first and second ends of the furnace top. The output end of the lifting motor is connected to the liftable furnace top via the traction line, and the fixed end of the lifting motor is connected to the third end of the furnace top.

5. The combustion device with a preheating burner according to claim 1 or 2, characterized in that, The sixth end of the first pipeline is provided with four inlet ends that are connected to the furnace cavity.

6. The combustion device with a preheating burner according to claim 2, characterized in that, The first temperature measuring coupler, the second temperature measuring coupler, the third temperature measuring coupler, and the fourth temperature measuring coupler are respectively arranged symmetrically.

7. A heating method for a combustion apparatus with a preheating burner according to any one of claims 1-6, comprising a premixed combustion method, a non-premixed combustion method for low ignition point fuel gas, and a non-premixed combustion method for high ignition point fuel gas, characterized in that, Adjust the position of the liftable furnace top connected to the lifting motor according to the workpiece to be processed to obtain the volume of the furnace cavity matching the workpiece to be processed. If a premixed combustion method is required, adjust the positioner to put the combined burner in the first working state. At this time, the premixed gas inlet and the premixed air inlet are connected to the first inlet and the second inlet of the premixed combustion chamber, respectively, while the non-premixed gas inlet and the non-premixed air inlet are closed. Air and gas are introduced into the premixed combustion chamber of the burner in the combined burner through the air inlet and the gas inlet, respectively, and the mixed gas is ignited until the workpiece to be processed is heated. If a non-premixed combustion method is required, the positioner is adjusted to put the combined burner in the second working state. At this time, the non-premixed gas inlet and the gas chamber inlet are connected, the non-premixed air inlet and the first inlet of the non-premixed combustion chamber are connected, and the premixed air inlet and the premixed gas inlet are closed. If a non-premixed combustion method with low ignition point gas is required, the first control motor and the first temperature sensor are started through the control cabinet, and the temperature difference value of the first temperature sensor is set. Air and gas are introduced into the non-premixed combustion chamber of the burner in the combined burner through the air inlet and the gas inlet, respectively, and the mixed gas is ignited. According to the comparison between the temperature measured by the first temperature sensor and the set temperature difference value, the air reversing valve is controlled by the first control motor connected to the first rotating shaft to switch between the third and fourth working states until the workpiece to be processed is heated. If a non-premixed combustion method with high ignition point gas is required, the first control motor, the second control motor, the first temperature sensor and the second temperature sensor are started through the control cabinet, and the temperature difference value of the first temperature sensor and the second temperature sensor is set. Air and gas are introduced into the non-premixed combustion chamber of the burner in the combined burner through the air inlet and gas inlet, respectively, and the mixture is ignited. Based on the comparison between the temperature measured by the first temperature sensor and the set temperature difference value, the air reversing valve is controlled to switch between the third and fourth working states by the first control motor connected to the first rotating shaft. Based on the comparison between the temperature measured by the second temperature sensor and the set temperature difference value, the gas reversing valve is controlled to switch between the third and fourth working states by the second control motor connected to the second rotating shaft, until the workpiece to be processed is heated.

8. The heating method of the combustion device with a preheating burner according to claim 7, characterized in that, In the non-premixed combustion method, the fourth operating state is: the air reversing valve and the fourth pipeline are connected, and the gas reversing valve and the sixth pipeline are connected.

9. The heating method of the combustion device with a preheating burner according to claim 7, characterized in that, In the non-premixed combustion method, the third operating state is: the air reversing valve and the fifth pipeline are connected, and the gas reversing valve and the seventh pipeline are connected.

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