Bidirectional operation tunnel kiln and working method thereof

Abstract

The invention belongs to the technical field of industrial furnace combustion, and particularly discloses a bidirectional operation tunnel kiln which is provided with a kiln body, the kiln body is divided into a first temperature section, a second temperature section, a third temperature section, a fourth temperature section, a fifth temperature section and a sixth temperature section from left to right, and two parallel rails laid from left to right are arranged in the kiln body; a trolley used for conveying materials is arranged on the track, and a plurality of heat storage burner sets are arranged on the inner walls of the front sides and the inner walls of the rear sides of the kiln bodies of the second temperature section, the third temperature section, the fourth temperature section and the fifth temperature section respectively. The system has the beneficial effects of high working efficiency, small heat loss, high comprehensive heat efficiency and waste heat recovery efficiency, more accurate in-kiln pressure control and the like; the invention further discloses a working method of the tunnel kiln.

Description

Technical Field

[0001] The present invention belongs to the technical field of industrial furnace combustion, and in particular discloses a tunnel kiln with bidirectional operation and its working method. Background Art

[0002] A tunnel kiln is generally a long straight tunnel with fixed walls and vaults on both sides and at the top, and kiln cars running on the tracks laid at the bottom. Combustion equipment is arranged on both sides in the middle of the tunnel kiln, forming a fixed high-temperature zone - the firing zone. The high-temperature flue gas generated by combustion flows along the tunnel towards the kiln head under the action of the chimney or induced draft fan at the front end of the tunnel kiln, and at the same time gradually preheats the products entering the kiln. This section constitutes the preheating zone of the tunnel kiln. Cold air is blown into the kiln tail to cool the products in the latter section of the tunnel kiln, and the blown cold air is extracted after cooling the products. This section constitutes the cooling zone of the tunnel kiln.

[0003] In the prior art, such as CN119222996A discloses a new type of tunnel kiln, which relates to the technical field of tunnel kiln temperature control. The technical solutions adopted include a kiln body, tracks, and kiln cars; multiple groups of reverse blowing air curtains are arranged above the preheating zone, and the jet direction of the reverse blowing air curtain faces the firing zone; a preheating zone temperature control device is arranged in the smoke exhaust area, and the preheating zone temperature control device includes a temperature control fan, a preheating extraction heat pipe group, and a preheating air supply pipe group; gaps are formed between the top, bottom, and both sides of the firing zone and the kiln cars; a cooling zone temperature control device is arranged in the cooling zone, and the cooling zone temperature control device includes multiple cooling temperature control pipe groups, and the cooling temperature control pipe group includes a cooling extraction heat pipe group, a cooling air supply pipe group, and a cooling temperature control fan.

[0004] The above prior art has the following defects: 1. The heat loss in the furnace is relatively large; 2. The comprehensive thermal efficiency and waste heat recovery efficiency of the tunnel kiln are low; 3. The production efficiency is low; 4. The air pressure control in the kiln is relatively poor. Summary of the Invention

[0005] In order to solve the above problems, the purpose of the present invention is to disclose a tunnel kiln with bidirectional operation and its working method, which is realized by the following technical solutions.

[0006] A tunnel kiln with bidirectional operation has a kiln body. From left to right, the kiln body is divided into a first temperature section, a second temperature section, a third temperature section, a fourth temperature section, a fifth temperature section, and a sixth temperature section; Two parallel tracks are laid inside the kiln body from left to right, and a trolley for transporting materials is arranged on the tracks. Multiple groups of regenerative burner groups are respectively arranged on the front inner wall and the rear inner wall of the kiln body in the second temperature section, the third temperature section, the fourth temperature section, and the fifth temperature section; Each of the regenerative burner groups in the second temperature section, the third temperature section, the fourth temperature section, and the fifth temperature section is connected to a gas valve station and a control configuration for controlling the combustion or smoke exhaust of the regenerative burner.

[0007] A bidirectional tunnel kiln as described above, each regenerative burner group is composed of two regenerative burners on the front inner wall and two regenerative burners on the rear inner wall; The gas valve station and control configuration include a flue gas pipeline, an air pipeline and a gas pipeline. The flue gas pipeline branches out two flue gas branches. One of the two flue gas branches is located at the front side, and the other of the two flue gas branches is located at the rear side. An air / flue gas reversing pneumatic valve is provided on the flue gas branch; The air pipeline branches out two air branches. One of the two air branches is located at the front side, and the other of the two air branches is located at the rear side. An air / flue gas reversing pneumatic valve is provided on the air branch; The flue gas branch and the air branch on the same side are connected after converging and are respectively communicated with the two regenerative burners on the corresponding side; The gas pipeline branches out two gas branches. A gas reversing solenoid valve is provided on the gas branch. One of the two gas branches is located at the front side, and the other of the two gas branches is located at the rear side. The gas branch is divided into two gas sub-branches, and the gas sub-branches are communicated with the corresponding regenerative burners on the corresponding side.

[0008] A bidirectional tunnel kiln as described above, a gas manual regulating valve is provided on the gas sub-branch for regulating the gas flow rate.

[0009] A bidirectional tunnel kiln as described above, a plurality of circulation fans are provided at the top of the kiln body in the first temperature section 1 and the sixth temperature section 10 for disturbing the circulating air flow in the furnace and transferring the heat of the materials on the high-temperature side to the materials on the low-temperature side.

[0010] A bidirectional tunnel kiln as described above, the gas valve station and control configuration further include a compressed air pipeline. The compressed air pipeline branches out two compressed air branches. One of the two compressed air branches is located at the front side, and the other of the two compressed air branches is located at the rear side. The compressed air branch at the front side is divided into two compressed air sub-branches, and the two compressed air sub-branches are connected to the air / flue gas reversing pneumatic valves (20) of the two air branches at the front side; The compressed air branch at the rear side is divided into two compressed air sub-branches, and the two compressed air sub-branches are connected to the air / flue gas reversing pneumatic valves (20) of the two air branches at the rear side. An air / flue gas reversing manual regulating valve 21 is provided on the compressed air sub-branch.

[0011] For a bidirectional tunnel kiln as described above, the air pipeline also branches out into two supplementary combustion air branches. Each supplementary combustion air branch is further divided into two supplementary combustion air sub-branches, which are respectively connected to the corresponding regenerative burners on the corresponding side. A manual regulating valve for supplementary combustion air is provided on each supplementary combustion air sub-branch. The regulating valve for supplementary combustion air is always opened at a fixed set position whether it is for combustion or smoke exhaust, and is used to adjust the oxidation or reduction atmosphere in the furnace.

[0012] For a bidirectional tunnel kiln as described above, ignition gas configurations are respectively provided on the left side of the second temperature section and the right side of the fifth temperature section, that is, the ignition gas configurations are located at the lower temperature positions on the left side of the second temperature section and the fifth temperature section to ensure the low-temperature combustion safety during the heating-up stage of the tunnel kiln and for the regenerative flat-flame burners. The ignition gas configuration consists of an ignition burner, an ignition gas pipeline connected to the ignition burner, and an ignition air pipeline.

[0013] For a bidirectional tunnel kiln as described above, the regenerative burner is a regenerative flat-flame burner.

[0014] For a bidirectional tunnel kiln as described above, the gas valve station and control configuration have a pressure reducing station for regulating and controlling the input pressures of air and gas. For a bidirectional tunnel kiln as described above, a first smoke exhaust device and multiple first smoke exhaust ports are provided at the left end of the kiln body, and a second smoke exhaust device and multiple second smoke exhaust ports are provided at the right end of the kiln body.

[0015] For a bidirectional tunnel kiln as described above, most of the combustion flue gas is discharged by the regenerative burners for smoke exhaust themselves, and the discharge amount is controlled by a manual regulating valve for air / flue gas reversal. A small part of the flue gas is discharged by the first smoke exhaust device and the second smoke exhaust device at both ends of the tunnel kiln. The first smoke exhaust device and the second smoke exhaust device are provided with smoke exhaust regulating valves for adjusting the smoke exhaust discharge amount to meet the pressure requirements in the kiln.

[0016] For a bidirectional tunnel kiln as described above, the first smoke exhaust device and the second smoke exhaust device are smoke exhaust blowers.

[0017] For a bidirectional tunnel kiln as described above, the air pipeline is connected to an air blower for combustion support.

[0018] For a bidirectional tunnel kiln as described above, through the operation of the bidirectional split cars and the materials, the heat of the materials after heating in the first temperature section or the sixth temperature section can be conducted to the materials on the low-temperature side, reducing heat loss. The flue gas discharge temperature at both ends of the kiln body is ≤150°C. Through the regenerative flat-flame burners and the combustion system, the flue gas discharge temperature in the heating section and the soaking section is ≤150°C, and the comprehensive thermal efficiency and waste heat recovery efficiency of the tunnel kiln are greatly improved.

[0019] A working method of a two-way running tunnel kiln, using the above-mentioned two-way running tunnel kiln, includes the following steps: Step 01: Ignite the regenerative burners on the front side of the second temperature section and the third temperature section through the ignition burners, so that the temperatures of the second temperature section and the third temperature section reach the set values, and use the regenerative burners on the rear side of the second temperature section and the third temperature section for smoke exhaust; Step 02: Ignite the regenerative burners on the rear side of the fourth temperature section and the fifth temperature section through the ignition burners, so that the temperatures of the fourth temperature section and the fifth temperature section reach the set values, and use the regenerative burners on the front side of the fourth temperature section and the fifth temperature section for smoke exhaust; Step 03: The trolley on the front track travels from the left end of the kiln body to the right end of the kiln body, and the trolley on the rear track travels from the right end of the kiln body to the left end of the kiln body; Step 04: After reaching the predetermined time, ignite the regenerative burners on the rear side of the second temperature section and the third temperature section through the ignition burners, so that the temperatures of the second temperature section and the third temperature section reach the set values, and use the regenerative burners on the front side of the second temperature section and the third temperature section for smoke exhaust; Step 05: Ignite the regenerative burners on the front side of the fourth temperature section and the fifth temperature section through the ignition burners, so that the temperatures of the fourth temperature section and the fifth temperature section reach the set values, and use the regenerative burners on the rear side of the fourth temperature section and the fifth temperature section for smoke exhaust; Step 06: The trolley on the front track travels from the right end of the kiln body to the left end of the kiln body, and the trolley on the rear track travels from the left end of the kiln body to the right end of the kiln body; Step 07: After reaching the predetermined time, repeat Steps 01 to 06 until the temperature rise of all materials is completed.

[0020] In the above-mentioned working method of a two-way running tunnel kiln, in Step 01: The gas reversing solenoid valves on the front side of the second temperature section and the third temperature section and the air / gas reversing pneumatic valves on the air branch are opened, and the air / gas reversing pneumatic valves on the front side of the flue gas branch are closed, so that the regenerative burners on the front side of the second temperature section and the third temperature section are used for combustion. The gas flows from the gas pipeline through the two gas branches on the front side, and after being adjusted by the gas manual regulating valve, it enters the corresponding regenerative burners on the front side. The air enters the air pipeline. One part flows through the air branch on the front side, and after being adjusted by the air / gas reversing manual regulating valve, it enters the corresponding regenerative burners. The other part flows through the supplementary combustion air branch on the front side. After the supplementary combustion air manual regulating valve is opened to the set position and fixed, an appropriate amount of supplementary combustion air enters the regenerative burners; The gas changeover solenoid valve, gas manual regulating valve, air / flue gas changeover manual regulating valve on the rear side of the second and third temperature sections, and the air / flue gas changeover pneumatic valve of the air branch are closed. The make-up combustion air manual regulating valve (22) is opened and set at a fixed position, and an appropriate amount of make-up combustion air enters the regenerative burner (5); the air / flue gas changeover pneumatic valve of the flue gas branch on the rear side is opened, so that the regenerative burners on the rear side of the second and third temperature sections are used for exhausting smoke. The flue gas enters the regenerative burners on the rear side of the second and third temperature sections, flows through the corresponding flue gas branches, and is discharged from the flue gas pipeline.

[0021] In step 02 of the working method of the bidirectional tunnel kiln described above: The gas changeover solenoid valve and the air / flue gas changeover pneumatic valve of the air branch on the rear side of the fourth and fifth temperature sections are opened, and the air / flue gas changeover pneumatic valve of the rear flue gas branch is closed, so that the regenerative burners on the rear side of the fourth and fifth temperature sections are used for combustion. The gas flows from the gas pipeline through the two rear gas branches, is adjusted by the gas manual regulating valve and then enters the corresponding regenerative burners on the rear side. The air enters the air pipeline, one part flows through the two rear air branches, is adjusted by the air / flue gas changeover manual regulating valve and then enters the corresponding regenerative burners, and the other part flows through the rear make-up combustion air branch. After the make-up combustion air manual regulating valve is opened and set at a fixed position, an appropriate amount of make-up combustion air enters the regenerative burner; The gas changeover solenoid valve, gas manual regulating valve, air / flue gas changeover manual regulating valve and air / flue gas changeover pneumatic valve of the air branch on the front side of the fourth and fifth temperature sections are closed. The make-up combustion air manual regulating valve (22) is opened and set at a fixed position, and an appropriate amount of make-up combustion air enters the regenerative burner (5); the air / flue gas changeover pneumatic valve of the front flue gas branch is opened, so that the regenerative burners on the front side of the fourth and fifth temperature sections are used for exhausting smoke. The flue gas enters the regenerative burners on the front side of the fourth and fifth temperature sections, flows through the corresponding flue gas branches, and is discharged from the flue gas pipeline.

[0022] In step 04 of the working method of the bidirectional tunnel kiln described above: The gas changeover solenoid valve and the air / flue gas changeover pneumatic valve on the rear side of the second and third temperature sections are opened, and the air / flue gas changeover pneumatic valve of the rear flue gas branch is closed, so that the regenerative burners on the rear side of the second and third temperature sections are used for combustion. The gas flows from the gas pipeline through the two rear gas branches, is adjusted by the gas manual regulating valve and then enters the corresponding regenerative burners on the rear side. The air enters the air pipeline, one part flows through the two rear air branches, is adjusted by the air / flue gas changeover manual regulating valve and then enters the corresponding regenerative burners, and the other part flows through the rear make-up combustion air branch. After the make-up combustion air manual regulating valve is opened and set at a fixed position, an appropriate amount of make-up combustion air enters the regenerative burner; The gas reversing solenoid valve, gas manual regulating valve, air / flue gas reversing manual regulating valve on the front side of the second temperature section and the third temperature section, and the air / flue gas reversing pneumatic valve on the air branch are closed. The supplementary combustion air manual regulating valve (22) is opened and set at a fixed position, and an appropriate amount of supplementary combustion air enters the regenerative burner (5); the air / flue gas reversing pneumatic valve on the front side of the flue gas branch is opened, so that the regenerative burners on the front side of the second temperature section and the third temperature section are used for exhausting smoke. The smoke enters the regenerative burners on the front side of the second temperature section and the third temperature section, flows through the corresponding flue gas branches, and is discharged from the flue gas pipeline.

[0023] In the working method of the double-direction running tunnel kiln described above, in step 05: The gas reversing solenoid valve and the air / flue gas reversing pneumatic valve on the front side of the fourth temperature section and the fifth temperature section are opened, and the air / flue gas reversing pneumatic valve on the front side of the flue gas branch is closed, so that the regenerative burners on the front side of the fourth temperature section and the fifth temperature section are used for combustion. The gas flows from the gas pipeline through the two front gas branches, and after being adjusted by the gas manual regulating valve, enters the corresponding regenerative burners on the front side. The air enters the air pipeline, one part flows through the two front air branches, and after being adjusted by the air / flue gas reversing manual regulating valve, enters the corresponding regenerative burners, and the other part flows through the front supplementary combustion air branch. After the supplementary combustion air manual regulating valve is opened and set at a fixed position, an appropriate amount of supplementary combustion air enters the regenerative burners; The gas reversing solenoid valve, gas manual regulating valve, air / flue gas reversing manual regulating valve on the rear side of the fourth temperature section and the fifth temperature section, and the air / flue gas reversing pneumatic valve on the air branch are closed. The supplementary combustion air manual regulating valve (22) is opened and set at a fixed position, and an appropriate amount of supplementary combustion air enters the regenerative burner (5); the air / flue gas reversing pneumatic valve (20) on the front side of the flue gas branch is opened, so that the regenerative burners on the rear side of the fourth temperature section and the fifth temperature section are used for exhausting smoke. The smoke enters the regenerative burners on the rear side of the fourth temperature section and the fifth temperature section, flows through the corresponding flue gas branches, and is discharged from the flue gas pipeline.

[0024] The present application has the following beneficial effects: 1. It has a double-direction running trolley, which can roast the materials on two tracks at one time, and the production efficiency is higher.

[0025] 2. Through the running of the double-direction opposite-opening trolley and the materials, the heat of the materials after heating in the first temperature section or the sixth temperature section can be conducted to the materials on the low-temperature side, reducing heat loss, and greatly improving the comprehensive thermal efficiency and waste heat recovery efficiency of the tunnel kiln.

[0026] 3. The second temperature section and the fifth temperature section are provided with circulating fans, which can disturb the circulating air flow in the furnace and transfer the heat of the materials on the high-temperature side to the materials on the low-temperature side.

[0027] 4. Most of the combustion flue gas is discharged by the regenerative burners for smoke exhaust, and the discharge volume is controlled by the air / flue gas reversing manual regulating valve. A small part of the flue gas is discharged by the first smoke exhaust device and the second smoke exhaust device at both ends of the tunnel kiln. The first smoke exhaust device and the second smoke exhaust device are provided with smoke exhaust regulating valves for adjusting the smoke exhaust volume, and the pressure control in the kiln is more accurate.

[0028] 5. A supplementary combustion air pipeline and a supplementary combustion air manual regulating valve are provided, and the oxidation or reduction atmosphere in the furnace is better. Description of the Drawings

[0029] Figure 1 It is a schematic structural diagram of the first-stage furnace kiln of the embodiment of the present invention and a schematic diagram of the corresponding furnace temperature control curve and material temperature line inside the first-stage furnace kiln.

[0030] Figure 2 It is a schematic structural diagram of the second-stage furnace kiln of the embodiment of the present invention and a schematic diagram of the corresponding furnace temperature control curve and material temperature line inside the second-stage furnace kiln.

[0031] Figure 3 It is a schematic structural diagram of the third-stage furnace kiln of the embodiment of the present invention and a schematic diagram of the corresponding furnace temperature control curve and material temperature line inside the third-stage furnace kiln.

[0032] Figure 4 It is a schematic structural diagram of the fourth-stage furnace kiln of the embodiment of the present invention and a schematic diagram of the corresponding furnace temperature control curve and material temperature line of the fourth-stage furnace kiln.

[0033] Figure 5 It is a schematic structural diagram of the fifth-stage furnace kiln of the embodiment of the present invention and a schematic diagram of the corresponding furnace temperature control curve and material temperature line inside the fifth-stage furnace kiln.

[0034] Figure 6 It is a top view of the inside of the first-stage furnace kiln of the embodiment of the present invention.

[0035] Figure 7 It is a cross-sectional view of the A-A section of the embodiment of the present invention.

[0036] Figure 8 It is a top view of the first-stage furnace kiln of the embodiment of the present invention.

[0037] Figure 9 It is a cross-sectional view of the B-B section of the embodiment of the present invention.

[0038] Figure 10 It is a schematic structural diagram of the heating and heat storage system of the embodiment of the present invention.

[0039] Figure 11 It is a front view of the first-stage furnace kiln of the unidirectionally operating tunnel kiln in the prior art and a schematic diagram of the internal temperature curve of the first-stage furnace kiln.

[0040] Figure 12 It is a front view of the second furnace of a unidirectional tunnel kiln in the prior art and a schematic diagram of the internal temperature curve of the second furnace.

[0041] Figure 13 It is a front view of the third furnace of a unidirectional tunnel kiln in the prior art and a schematic diagram of the internal temperature curve of the third furnace.

[0042] In the figure, from left to right, the first furnace, the second furnace, the third furnace, the fourth furnace and the fifth furnace of the invention embodiment constitute the complete furnace of the invention embodiment.

[0043] In the figure, from left to right, the first furnace, the second furnace and the third furnace of the prior art constitute the complete unidirectional running furnace of the prior art.

[0044] In the figure, the corresponding names of the reference numerals are: 1. First temperature section, 2. First smoke exhaust device, 3. First smoke exhaust port, 4. Second temperature section, 5. Regenerative burner, 6. Third temperature section, 7. Fourth temperature section, 8. Pressure reducing station, 9. Fifth temperature section, 10. Sixth temperature section, 11. Second smoke exhaust device, 12. Second smoke exhaust port, 13. Material, 15. Trolley, 16. Circulation fan, 17. Ignition burner, 18. Gas reversing solenoid valve, 19. Gas manual regulating valve, 20. Air / flue gas reversing pneumatic valve, 21. Air / flue gas reversing manual regulating valve, 22. Supplementary combustion air manual regulating valve. Detailed implementation mode

[0045] Such as Figures 1 to 10 , a bidirectional tunnel kiln, having a kiln body, from left to right, the kiln body is divided into a first temperature section 1, a second temperature section 4, a third temperature section 6, a fourth temperature section 7, a fifth temperature section 9 and a sixth temperature section 10; Inside the kiln body, there are two parallel tracks laid from left to right. On the tracks, there are trolleys 15 for transporting materials 13. On the inner walls of the second temperature section 4, the third temperature section 6, the fourth temperature section 7 and the fifth temperature section 9, there are respectively multiple groups of regenerative burner groups. Each group of regenerative burner groups is composed of two regenerative burners 5 on the front inner wall and two regenerative burners 5 on the rear inner wall. On the top of the kiln body of the first temperature section 1 and the sixth temperature section 10, there are multiple circulation fans 16 for disturbing the circulating air flow in the furnace and transferring the heat of the materials on the high-temperature side to the materials on the low-temperature side; At the left end of the kiln body, there is a first smoke exhaust device 2 and multiple first smoke exhaust ports 3. At the right end of the kiln body, there is a second smoke exhaust device 11 and multiple second smoke exhaust ports 12; The regenerative burner groups of the second temperature section 4, the third temperature section 6, the fourth temperature section 7, and the fifth temperature section 9 are each connected to a gas valve station and control configuration, and the gas valve station and control configuration have a pressure reducing station 8 for controlling the input pressure of air and gas. The gas valve station and control configuration include a flue gas pipeline, an air pipeline, a gas pipeline, and a compressed air pipeline. The flue gas pipeline branches out into two flue gas branches, one of the two flue gas branches is located at the front side, and the other of the two flue gas branches is located at the rear side. An air / flue gas reversing pneumatic valve 20 is provided on the flue gas branch. The air pipeline branches out into two air branches and two supplementary combustion air branches. One of the two air branches is located at the front side, and the other of the two air branches is located at the rear side. An air / flue gas reversing pneumatic valve 20 is provided on the air branch. The supplementary combustion air branch is divided into two supplementary combustion air sub-branches, and the supplementary combustion air sub-branches are respectively connected to the corresponding regenerative burners 5 on the corresponding side. A supplementary combustion air manual regulating valve 22 is provided on the supplementary combustion air sub-branch for regulating the oxidation or reduction atmosphere in the furnace. The flue gas branch and the air branch on the same side are connected after converging and are respectively connected to the two regenerative burners 5 on the corresponding side. The gas pipeline branches out into two gas branches. A gas reversing solenoid valve 18 is provided on the gas branch. One of the two gas branches is located at the front side, and the other of the two gas branches is located at the rear side. The gas branch is divided into two gas sub-branches. A gas manual regulating valve 19 is provided on the gas sub-branch for regulating the gas flow rate. The gas sub-branch is connected to the corresponding regenerative burner 5 on the corresponding side. The compressed air pipeline branches out into two compressed air branches. One of the two compressed air branches is located at the front side, and the other of the two compressed air branches is located at the rear side. The compressed air branch located at the front side is divided into two compressed air sub-branches, and the two compressed air sub-branches are connected to the air / flue gas reversing pneumatic valves 20 of the two air branches located at the front side. The compressed air branch located at the rear side is divided into two compressed air sub-branches, and the two compressed air sub-branches are connected to the air / flue gas reversing pneumatic valves 20 of the two air branches located at the rear side. An air / flue gas reversing manual regulating valve 21 is provided on the compressed air sub-branch. Ignition gas configurations are respectively provided on the left side of the second temperature section 4 and the right side of the fifth temperature section 9, that is, the ignition gas configurations are located at the lower temperature positions on the left side of the second temperature section 4 and the right side of the fifth temperature section 9 to ensure the safety of the low-temperature combustion of the tunnel kiln during the heating-up stage and the regenerative flat-flame burners. The ignition gas configuration is composed of an ignition burner 17 and an ignition gas pipeline and an ignition air pipeline connected to the ignition burner 17.

[0046] For the above-mentioned tunnel kiln with two-way operation, the regenerative burner 5 is a regenerative flat-flame burner.

[0047] For a two-way operating tunnel kiln as described above, most of the combustion flue gas is discharged by the regenerative burners 5 for smoke exhaust, and the discharge amount is controlled by the air / flue gas reversing manual regulating valve 21. A small portion of the flue gas is discharged by the first smoke exhaust device 2 and the second smoke exhaust device 11 at both ends of the tunnel kiln. The first smoke exhaust device 2 and the second smoke exhaust device 11 are provided with smoke exhaust regulating valves for adjusting the smoke exhaust discharge amount to meet the requirements of the pressure inside the kiln.

[0048] For a two-way operating tunnel kiln as described above, the first smoke exhaust device 2 and the second smoke exhaust device 11 are smoke exhaust blowers.

[0049] For a two-way operating tunnel kiln as described above, the air pipeline is connected with an auxiliary combustion blower.

[0050] For a two-way operating tunnel kiln as described above, through the operation of the two-way split trolley 15 and the material 13, the heat of the material 13 after heating in the first temperature section 1 or the sixth temperature section 10 can be conducted to the material 13 on the low-temperature side, reducing heat loss. The flue gas discharge temperature at both ends of the kiln body is ≤150°C. Through the regenerative flat-flame burner and the combustion system, the discharge temperature of the combustion flue gas in the heating section and the soaking section is ≤150°C, and the comprehensive thermal efficiency and waste heat recovery efficiency of the tunnel kiln are greatly improved.

[0051] For a two-way operating tunnel kiln as described above, the first temperature section 1 and the sixth temperature section 10 are the preheating / cooling sections of the material 13, the second temperature section 4 and the fifth temperature section 9 are the heating / slow cooling sections of the material 13, and the third temperature section 6 and the fourth temperature section 7 are the soaking sections of the material 13.

[0052] A working method of a two-way operating tunnel kiln, using a two-way operating tunnel kiln as described above, includes the following steps: Step 01: Open the gas reversing solenoid valve 18 at the front side of the second temperature section 4 and the third temperature section 6, and the air / flue gas reversing pneumatic valve 20 of the air branch, and close the air / flue gas reversing pneumatic valve 20 of the flue gas branch at the front side, so that the regenerative burners 5 at the front side of the second temperature section 4 and the third temperature section 6 are used for combustion. The gas flows through two gas branches at the front side from the gas pipeline, and after being adjusted by the gas manual regulating valve 19, it enters the corresponding regenerative burners 5 at the front side. The air enters the air pipeline, one part flows through the air branch at the front side, and after being adjusted by the air / flue gas reversing manual regulating valve 21, it enters the corresponding regenerative burners 5, and the other part flows through the supplementary combustion air branch at the front side. After the supplementary combustion air manual regulating valve 22 is opened to a set position and fixed, an appropriate amount of supplementary combustion air enters the regenerative burners 5; Ignite the regenerative burners 5 at the front side of the second temperature section 4 and the third temperature section 6 through the ignition burner 17 to make the temperatures of the second temperature section 4 and the third temperature section 6 reach the set values; Close the gas change-over solenoid valve 18, gas manual regulating valve 19, air / flue gas change-over manual regulating valve 21 at the rear side of the second temperature section 4 and the third temperature section 6, and the air / flue gas change-over pneumatic valve 20 in the air branch. The opening set position of the supplementary combustion air manual regulating valve (22) is fixed, and an appropriate amount of supplementary combustion air enters the regenerative burner (5); open the air / flue gas change-over pneumatic valve (20) in the rear flue gas branch, so that the regenerative burners 5 at the rear side of the second temperature section 4 and the third temperature section 6 are used for exhausting flue gas. The flue gas enters the regenerative burners 5 at the rear side of the second temperature section 4 and the third temperature section 6, flows through the corresponding flue gas branches, and is discharged from the flue gas pipeline. Step 02: Open the gas change-over solenoid valve 18 at the rear side of the fourth temperature section 7 and the fifth temperature section 9, and the air / flue gas change-over pneumatic valve 20 in the air branch. Close the air / flue gas change-over pneumatic valve 20 in the rear flue gas branch, so that the regenerative burners 5 at the rear side of the fourth temperature section 7 and the fifth temperature section 9 are used for combustion. The gas flows through the two rear gas branches from the gas pipeline, enters the corresponding regenerative burners 5 at the rear side after being regulated by the gas manual regulating valve 19. The air enters the air pipeline. One part flows through the two rear air branches, enters the corresponding regenerative burners 5 after being regulated by the air / flue gas change-over manual regulating valve 21. The other part flows through the rear supplementary combustion air branch, and after the opening set position of the supplementary combustion air manual regulating valve 22 is opened and fixed, an appropriate amount of supplementary combustion air enters the regenerative burner 5. Ignite the regenerative burners 5 at the rear side of the fourth temperature section 7 and the fifth temperature section 9 through the ignition burner 17, so that the temperatures of the fourth temperature section 7 and the fifth temperature section 9 reach the set values. Close the gas change-over solenoid valve 18, gas manual regulating valve 19, air / flue gas change-over manual regulating valve 21 at the front side of the fourth temperature section 7 and the fifth temperature section 9, and the air / flue gas change-over pneumatic valve 20 in the air branch. The opening set position of the supplementary combustion air manual regulating valve (22) is fixed, and an appropriate amount of supplementary combustion air enters the regenerative burner (5); open the air / flue gas change-over pneumatic valve (20) in the front flue gas branch, so that the regenerative burners 5 at the front side of the fourth temperature section 7 and the fifth temperature section 9 are used for exhausting flue gas. The flue gas enters the regenerative burners 5 at the front side of the fourth temperature section 7 and the fifth temperature section 9, flows through the corresponding flue gas branches, and is discharged from the flue gas pipeline. Step 03: The trolley 15 on the front track travels from left to right, successively passing through the first temperature section 1, the second temperature section 4, the third temperature section 6, the fourth temperature section 7, the fifth temperature section 9, and the sixth temperature section 10. The trolley 15 on the rear track travels from right to left, successively passing through the sixth temperature section 10, the fifth temperature section 9, the fourth temperature section 7, the third temperature section 6, the second temperature section 4, and the first temperature section 1. The temperature of the material 13 at the rear side of the first temperature section 1 is conducted to the material 13 at the front side of the first temperature section 1, cooling the material 13 at the rear side of the first temperature section 1 and preheating the material 13 at the front side of the first temperature section 1; The temperature of the material 13 at the front side of the sixth temperature section 10 is conducted to the material 13 at the rear side of the sixth temperature section 10, cooling the material 13 at the front side of the sixth temperature section 10 and preheating the material 13 at the rear side of the sixth temperature section 10; Step 04: After reaching the predetermined time, open the gas reversing solenoid valve 18 and the air / flue gas reversing pneumatic valve 20 at the rear sides of the second temperature section 4 and the third temperature section 6, and close the air / flue gas reversing pneumatic valve 20 of the rear side flue gas branch, so that the regenerative burners 5 at the rear sides of the second temperature section 4 and the third temperature section 6 are used for combustion. The gas flows through the two rear gas branches from the gas pipeline, enters the corresponding regenerative burners 5 at the rear side after being adjusted by the gas manual regulating valve 19. The air enters the air pipeline. One part flows through the two rear air branches, enters the corresponding regenerative burners 5 after being adjusted by the air / flue gas reversing manual regulating valve 21, and the other part flows through the rear supplementary combustion air branch. After the supplementary combustion air manual regulating valve 22 is opened to the set position and fixed, an appropriate amount of supplementary combustion air enters the regenerative burners 5; Ignite the regenerative burners 5 at the rear sides of the second temperature section 4 and the third temperature section 6 through the ignition burner 17, so that the temperatures of the second temperature section 4 and the third temperature section 6 reach the set values; Close the gas reversing solenoid valve 18, the gas manual regulating valve 19, the air / flue gas reversing manual regulating valve 21 and the air / flue gas reversing pneumatic valve 20 of the air branch at the front sides of the second temperature section 4 and the third temperature section 6. The supplementary combustion air manual regulating valve (22) is opened to the set position and fixed, and an appropriate amount of supplementary combustion air enters the regenerative burners (5). Open the air / flue gas reversing pneumatic valve (20) of the front side flue gas branch, so that the regenerative burners 5 at the front sides of the second temperature section 4 and the third temperature section 6 are used for exhausting smoke. The flue gas enters the regenerative burners 5 at the front sides of the second temperature section 4 and the third temperature section 6, flows through the corresponding flue gas branches, and is discharged from the flue gas pipeline; Step 05: Open the gas reversing solenoid valve 18 and the air / flue gas reversing pneumatic valve 20 at the front sides of the fourth temperature section 7 and the fifth temperature section 9, and close the air / flue gas reversing pneumatic valve 20 of the front side flue gas branch, so that the regenerative burners 5 at the front sides of the fourth temperature section 7 and the fifth temperature section 9 are used for combustion. The gas flows through the two front gas branches from the gas pipeline, enters the corresponding regenerative burners 5 at the front side after being adjusted by the gas manual regulating valve 19. The air enters the air pipeline. One part flows through the two front air branches, enters the corresponding regenerative burners 5 after being adjusted by the air / flue gas reversing manual regulating valve 21, and the other part flows through the front supplementary combustion air branch. After the supplementary combustion air manual regulating valve 22 is opened to the set position and fixed, an appropriate amount of supplementary combustion air enters the regenerative burners 5; Ignite the regenerative burners 5 on the front side of the fourth temperature section 7 and the fifth temperature section 9 through the ignition burner 17 to make the temperatures of the fourth temperature section 7 and the fifth temperature section 9 reach the set values; Close the gas reversing solenoid valve 18, the gas manual regulating valve 19, the air / flue gas reversing manual regulating valve 21 on the rear side of the fourth temperature section 7 and the fifth temperature section 9, and the air / flue gas reversing pneumatic valve 20 on the air branch. The supplementary combustion air manual regulating valve (22) is opened at a fixed set position, and an appropriate amount of supplementary combustion air enters the regenerative burner (5); open the air / flue gas reversing pneumatic valve (20) on the front side of the flue gas branch, so that the regenerative burners 5 on the rear side of the fourth temperature section 7 and the fifth temperature section 9 are used for exhausting smoke. The smoke enters the regenerative burners 5 on the rear side of the fourth temperature section 7 and the fifth temperature section 9, flows through the corresponding flue gas branches, and is discharged from the flue gas pipeline; Step 06: The trolley 15 on the front side track travels from right to left, successively passing through the sixth temperature section 10, the fifth temperature section 9, the fourth temperature section 7, the third temperature section 6, the second temperature section 4, and the first temperature section 1; The trolley 15 on the rear side track travels from left to right, successively passing through the first temperature section 1, the second temperature section 4, the third temperature section 6, the fourth temperature section 7, the fifth temperature section 9, and the sixth temperature section 10; The temperature of the material 13 on the front side of the first temperature section 1 is conducted to the material 13 on the rear side of the first temperature section 1, which cools the material 13 on the front side of the first temperature section 1 and preheats the material 13 on the rear side of the first temperature section 1.

[0053] The temperature of the material 13 on the rear side of the sixth temperature section 10 is conducted to the material 13 on the front side of the sixth temperature section 10, which cools the material 13 on the rear side of the sixth temperature section 10 and preheats the material 13 on the front side of the sixth temperature section 10.

[0054] Step 07: After reaching the predetermined time, loop through steps 01 to 06 until the temperature increase of all materials 13 is completed.

[0055] The present application has the following beneficial effects: 1. It has a trolley that runs bidirectionally and can roast the materials on two tracks at one time, with higher production efficiency.

[0056] 2. Through the operation of the bidirectional oncoming trolley 15 and the materials 13, the heat of the materials 13 after the heating of the first temperature section 1 or the sixth temperature section 10 can be conducted to the materials 13 on the low-temperature side, reducing heat loss. Compared with the Figures 11 to 13 one-way running tunnel kiln shown, the comprehensive thermal efficiency and waste heat recovery efficiency are greatly improved.

[0057] 3. The second temperature stage 4 and the fifth temperature stage 9 are equipped with a circulation fan 16, which can disturb the circulating air flow in the furnace and transfer the heat of the high-temperature side material to the low-temperature side material.

[0058] 4. Most of the combustion flue gas is discharged by the regenerative burner 5 for smoke exhaust itself, and the discharge amount is controlled by the air / flue gas reversing manual regulating valve 21. A small part of the flue gas is discharged by the first smoke exhaust device 2 and the second smoke exhaust device 11 at both ends of the tunnel kiln. The first smoke exhaust device 2 and the second smoke exhaust device 11 are provided with smoke exhaust regulating valves for adjusting the smoke exhaust discharge amount, and the pressure control in the kiln is more accurate.

[0059] 5. A supplementary combustion air pipeline and a supplementary combustion air manual regulating valve 22 are provided, and the oxidation or reduction atmosphere in the furnace is better.

[0060] The above embodiments are only the preferred technical solutions of the present invention and should not be regarded as limitations on the present invention. The protection scope of the present invention should be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, the equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A bidirectional tunnel kiln having a kiln body, characterized in that: From left to right, the kiln body is divided into the first temperature section (1), the second temperature section (4), the third temperature section (6), the fourth temperature section (7), the fifth temperature section (9) and the sixth temperature section (10); Two parallel tracks are arranged from left to right inside the kiln body, and a trolley (15) for transporting materials (13) is arranged on the tracks. A plurality of heat storage burner groups are arranged on the front inner wall and the rear inner wall of the kiln body in the second temperature section (4), the third temperature section (6), the fourth temperature section (7) and the fifth temperature section (9); The regenerative burner groups of the second temperature section (4), the third temperature section (6), the fourth temperature section (7) and the fifth temperature section (9) are each connected to a gas valve station and a control configuration for controlling the regenerative burner combustion group or smoke exhaust.

2. A bidirectional tunnel kiln according to claim 1, characterized in that: A plurality of circulation fans (16) are provided on the top of the kiln body of the first temperature section (1) and the sixth temperature section (10); A first smoke exhaust device (2) is provided at the left end of the kiln body, and a second smoke exhaust device (11) is provided at the right end of the kiln body.

3. A bidirectional tunnel kiln according to claim 2, characterized in that: Each heat storage burner group is composed of two heat storage burners (5) located on the front inner wall and two heat storage burners (5) located on the rear inner wall; The gas valve station and control configuration include a flue gas pipeline, an air pipeline and a gas pipeline, the flue gas pipeline is divided into two flue gas branches, one of the two flue gas branches is located at the front side, and the other of the two flue gas branches is located at the rear side, and an air / flue gas reversing pneumatic valve (20) is provided on the flue gas branch; The air pipeline is divided into two air branches, one of the two air branches is located at the front side, and the other of the two air branches is located at the rear side, and an air / smoke reversing pneumatic valve (20) is provided on the air branch; The flue gas branch and the air branch located on the same side are connected to the two regenerative burners (5) on the corresponding side respectively after they are joined; The gas pipeline is divided into two gas branches, each of which is provided with a gas reversing solenoid valve (18). One of the two gas branches is located at the front side, and the other of the two gas branches is located at the rear side. The gas branch is divided into two gas branches, and the gas branches are connected to the corresponding regenerative burners (5) on the corresponding side.

4. A bidirectional tunnel kiln according to claim 3, characterized in that: The gas valve station and control configuration also includes a compressed air pipeline, the compressed air pipeline is divided into two compressed air branches, one of the two compressed air branches is located at the front side, and the other of the two compressed air branches is located at the rear side. The compressed air branch located at the front side is divided into two compressed air branches, and the two compressed air branches are connected to the air / smoke reversing pneumatic valves (20) of the two air branches located at the front side; The compressed air branch located at the rear side is divided into two compressed air branches, and the two compressed air branches are connected to the air / smoke reversing pneumatic valves (20) of the two air branches located at the rear side. An air / smoke reversing manual regulating valve 21 is provided on the compressed air branch; The air pipeline is further divided into two supplementary combustion air branches, which are respectively connected to the corresponding heat storage burners (5) on the corresponding side, and a supplementary combustion air manual regulating valve (22) is provided on the supplementary combustion air branch.

5. A bidirectional tunnel kiln according to claim 4, characterized in that: An ignition gas configuration is provided on the left side of the second temperature section (4) and on the right side of the fifth temperature section (9), respectively. The ignition gas configuration is composed of an ignition burner (17), an ignition gas pipeline and an ignition air pipeline connected to the ignition burner (17).

6. A working method of a bidirectional tunnel kiln, characterized in that: A bidirectional tunnel kiln using claim 5 comprises the following steps: Step 01: Ignite the regenerative burner (5) at the front side of the second temperature section (4) and the third temperature section (6) by means of the ignition burner (17), so that the temperature of the second temperature section (4) and the third temperature section (6) reaches a set value, and use the regenerative burner (5) at the rear side of the second temperature section (4) and the third temperature section (6) for smoke exhaust; Step 02: Ignite the regenerative burners (5) at the rear side of the fourth temperature section (7) and the fifth temperature section (9) by means of the ignition burner (17), so that the temperatures of the fourth temperature section (7) and the fifth temperature section (9) reach the set values, and use the regenerative burners (5) at the front side of the fourth temperature section (7) and the fifth temperature section (9) for smoke exhaust; Step 03: The trolley (15) on the track at the front side moves from the left end of the kiln body to the right end of the kiln body, and the trolley (15) on the track at the rear side moves from the right end of the kiln body to the left end of the kiln body; Step 04: After the predetermined time is reached, the regenerative burner (5) at the rear side of the second temperature section (4) and the third temperature section (6) is ignited by the ignition burner (17), so that the temperature of the second temperature section (4) and the third temperature section (6) reaches the set value, and the regenerative burner (5) at the front side of the second temperature section (4) and the third temperature section (6) is used for smoke exhaust; Step 05: Ignite the regenerative burner (5) at the front side of the fourth temperature section (7) and the fifth temperature section (9) by means of the ignition burner (17), so that the temperature of the fourth temperature section (7) and the fifth temperature section (9) reaches a set value, and use the regenerative burner (5) at the rear side of the fourth temperature section (7) and the fifth temperature section (9) for smoke exhaust; Step 06: The trolley (15) on the track at the front side moves from the right end of the kiln body to the left end of the kiln body, and the trolley (15) on the track at the rear side moves from the left end of the kiln body to the right end of the kiln body; Step 07: After the predetermined time is reached, steps 01 to 06 are repeated until the combustion and heating of all materials (13) are completed.

7. The working method of a bidirectional tunnel kiln according to claim 6, characterized in that: In step 01: the gas reversing solenoid valve (18) and the air / smoke reversing pneumatic valve (20) of the air branch on the front side of the second temperature section (4) and the third temperature section (6) are opened, and the air / smoke reversing pneumatic valve (20) of the front smoke branch is closed, so that the heat storage burner (5) on the front side of the second temperature section (4) and the third temperature section (6) is used for combustion, and the gas flows from the gas pipeline through the two gas branches on the front side, and enters the corresponding heat storage burner (5) on the front side after being adjusted by the gas manual regulating valve (19), and the air enters the air pipeline, one way flows through the air branch on the front side, and enters the corresponding heat storage burner (5) after being adjusted by the air / smoke reversing manual regulating valve (21), and the other way flows through the supplementary combustion air branch on the front side, and is adjusted to the set position by the supplementary combustion air manual regulating valve (22) and then fixed, and the supplementary combustion air enters the heat storage burner (5) after an appropriate amount of air; The gas reversing solenoid valve (18), the gas manual regulating valve (19), the supplementary combustion air manual regulating valve (22), the air / smoke reversing manual regulating valve (21) and the air / smoke reversing pneumatic valve (20) of the air branch on the rear side of the second temperature section (4) and the third temperature section (6) are closed, the supplementary combustion air manual regulating valve (22) is opened and fixed to a set position, and a proper amount of supplementary combustion air enters the heat storage burner (5); the air / smoke reversing pneumatic valve (20) of the rear side smoke branch is opened, so that the heat storage burner (5) on the rear side of the second temperature section (4) and the third temperature section (6) is used for smoke exhaust, and the smoke enters the heat storage burner (5) on the rear side of the second temperature section (4) and the third temperature section (6), flows through the corresponding smoke branch, and is discharged from the smoke pipeline.

8. The working method of a bidirectional tunnel kiln according to claim 7, characterized in that: In step 02: the gas reversing solenoid valve (18) and the air / smoke reversing pneumatic valve (20) of the air branch at the rear side of the fourth temperature section (7) and the fifth temperature section (9) are opened, and the air / smoke reversing pneumatic valve (20) of the rear smoke branch is closed, so that the heat storage burner (5) at the rear side of the fourth temperature section (7) and the fifth temperature section (9) is used for combustion, and the gas flows from the gas pipeline through the two gas branches at the rear side, and enters the corresponding heat storage burner (5) at the rear side after being regulated by the gas manual regulating valve (19), and the air enters the air pipeline, one way flows through the two air branches at the rear side, and enters the corresponding heat storage burner (5) after being regulated by the air / smoke reversing manual regulating valve (21), and the other way flows through the supplementary combustion air branch at the rear side, and is regulated by the supplementary combustion air manual regulating valve (22) and opened to a set position and then fixed, and a proper amount of supplementary combustion air enters the heat storage burner (5); The gas reversing solenoid valve (18), the gas manual regulating valve (19), the supplementary air manual regulating valve (22), the air / smoke reversing manual regulating valve (21) and the air / smoke reversing pneumatic valve (20) of the air branch on the front side of the fourth temperature section (7) and the fifth temperature section (9) are closed, the supplementary air manual regulating valve (22) is opened and the setting position is fixed, and the supplementary air enters the heat storage burner (5) in an appropriate amount; the air / smoke reversing pneumatic valve (20) of the front side smoke branch is opened, so that the heat storage burner (5) on the front side of the fourth temperature section (7) and the fifth temperature section (9) is used for smoke exhaust, and the smoke enters the heat storage burner (5) on the front side of the fourth temperature section (7) and the fifth temperature section (9), flows through the corresponding smoke branch, and is discharged from the smoke pipeline.

9. The working method of a bidirectional tunnel kiln according to claim 8, characterized in that: In step 04: The gas changeover solenoid valve (18) and the air / flue gas changeover pneumatic valve (20) at the rear sides of the second temperature section (4) and the third temperature section (6) are opened, and the air / flue gas changeover pneumatic valve (20) of the flue gas branch at the rear side is closed, so that the regenerative burners (5) at the rear sides of the second temperature section (4) and the third temperature section (6) are used for combustion. The gas flows from the gas pipeline through the two rear gas branches, and after being adjusted by the gas manual regulating valve (19), it enters the corresponding regenerative burners (5) at the rear side. The air enters the air pipeline. One way flows through the two rear air branches, and after being adjusted by the air / flue gas changeover manual regulating valve (21), it enters the corresponding regenerative burners (5). The other way flows through the rear supplementary combustion air branch, and after the supplementary combustion air manual regulating valve (22) is opened to a set position and then fixed, the supplementary combustion air is adjusted appropriately and then enters the regenerative burners (5). The gas changeover solenoid valve (18), the gas manual regulating valve (19), the supplementary combustion air manual regulating valve (22), the air / flue gas changeover manual regulating valve (21) and the air / flue gas changeover pneumatic valve (20) of the air branch at the front sides of the second temperature section (4) and the third temperature section (6) are closed, and the supplementary combustion air manual regulating valve (22) is opened to a set position and fixed, and the supplementary combustion air enters the regenerative burners (5) appropriately; The air / flue gas changeover pneumatic valve (20) of the flue gas branch at the front side is opened, so that the regenerative burners (5) at the front sides of the second temperature section (4) and the third temperature section (6) are used for exhausting flue gas. The flue gas enters the regenerative burners (5) at the front sides of the second temperature section (4) and the third temperature section (6), flows through the corresponding flue gas branches, and is discharged from the flue gas pipeline.

10. The working method of a bidirectional tunnel kiln according to claim 9, characterized in that: In step 05: The gas changeover solenoid valve (18) and the air / flue gas changeover pneumatic valve (20) at the front sides of the fourth temperature section (7) and the fifth temperature section (9) are opened, and the air / flue gas changeover pneumatic valve (20) of the flue gas branch at the front side is closed, so that the regenerative burners (5) at the front sides of the fourth temperature section (7) and the fifth temperature section (9) are used for combustion. The gas flows from the gas pipeline through the two front gas branches, and after being adjusted by the gas manual regulating valve (19), it enters the corresponding regenerative burners (5) at the front side. The air enters the air pipeline. One way flows through the two front air branches, and after being adjusted by the air / flue gas changeover manual regulating valve (21), it enters the corresponding regenerative burners (5). The other way flows through the front supplementary combustion air branch, and after the supplementary combustion air manual regulating valve (22) is opened to a set position and then fixed, the supplementary combustion air is adjusted appropriately and then enters the regenerative burners (5). The gas reversing solenoid valve (18), the gas manual regulating valve (19), the supplementary combustion air manual regulating valve (22), the air / smoke reversing manual regulating valve (21) and the air / smoke reversing pneumatic valve (20) of the air branch on the rear side of the fourth temperature section (7) and the fifth temperature section (9) are closed, the supplementary combustion air manual regulating valve (22) is opened and the setting position is fixed, and the supplementary combustion air enters the heat storage burner (5) in an appropriate amount; the air / smoke reversing pneumatic valve (20) of the rear side smoke branch is opened, so that the heat storage burner (5) on the rear side of the fourth temperature section (7) and the fifth temperature section (9) is used for smoke exhaust, and the smoke enters the heat storage burner (5) on the rear side of the fourth temperature section (7) and the fifth temperature section (9), flows through the corresponding smoke branch, and is discharged from the smoke pipeline.

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