Sanitary ware shuttle kiln adopting excess air combustion technology

Abstract

The invention relates to the technical field of shuttle kilns, and discloses a sanitary ware shuttle kiln adopting an excess air combustion technology, the sanitary ware shuttle kiln comprises a kiln, a combustion-supporting air pipe and a gas pipe, the front side of the kiln is provided with a kiln cover, the side face of the kiln is provided with an excess air assembly, and the excess air assembly comprises a conduction pipe; the conduction pipe is connected to the outer wall of the kiln through a support, one end of the conduction pipe is provided with a connecting pipe, the other end of the conduction pipe is connected with a combustion-supporting air pipe, and the conduction pipe is communicated with the combustion-supporting air pipe. According to the sanitary ware shuttle kiln based on the excess air combustion technology, the air pressure input of the proportional valve in front of the burner is changed by adjusting the opening degree of the pressure release valve, precise control over the gas input amount at different temperature sections under the same air volume is achieved, a variable air-gas proportional combustion mode is formed, the product temperature and atmosphere requirements are met, and the product quality is improved. And the air pressure input of a proportional valve is reduced through a low-temperature section, so that a combustion mode with small air atmosphere is realized.

Description

Technical Field

[0001] This invention relates to the field of shuttle kiln technology, and more particularly to a sanitary ware shuttle kiln using excess air combustion technology. Background Technology

[0002] A shuttle kiln is an intermittent kiln widely used for firing ceramic products such as sanitary ware. It achieves mass production through the movement of kiln cars and features a wide firing range and strong adaptability. A typical shuttle kiln structure includes a kiln body, kiln cars, a combustion system, a flue gas system, and a control system. The combustion system typically uses gas burners in conjunction with combustion air to supply heat. The kiln cars load the green bodies and complete preheating, firing, and cooling processes within the kiln.

[0003] In response, patent CN218627711U discloses a high-efficiency combustion air system for a shuttle kiln. This system includes a kiln body, a heat exchanger, and a tail gas treatment device. The kiln body is connected to the tail gas treatment device via the heat exchanger. A combustion air device is located at the top of the kiln cavity, with an air outlet. Below the air outlet are a primary combustion port and a secondary combustion port. A smoke outlet is located at the bottom of the kiln body. An insulation layer is provided on the outside of the kiln body. The heat exchanger transfers heat from the hot smoke to the combustion air, thereby increasing its temperature. By adjusting the diameter of the combustion air duct, using a method of appropriately increasing the main duct size and varying the duct diameter, the airflow distribution in each branch duct becomes more consistent, significantly improving the combustion effect.

[0004] However, in practical applications, existing shuttle kilns suffer from excessive temperature differences during the low-temperature heating stage, leading to cracking of the billet due to concentrated thermal stress. The excessive air combustion method used to improve temperature uniformity easily causes flame instability, and high-speed airflow can cause flame detachment or extinguishing. These problems result in significant shortcomings of existing shuttle kilns in terms of production efficiency, energy costs, and environmental performance. Summary of the Invention

[0005] The technical problem to be solved by this invention is that traditional shuttle kilns have the problem of excessive temperature difference inside the kiln and easy cracking of products during the low temperature heating stage. To address this, we propose a sanitary ware shuttle kiln with excessive air combustion technology.

[0006] To achieve the above objectives, this application adopts the following technical solution: a sanitary ware shuttle kiln with excess air combustion technology, comprising a kiln, a combustion air duct, and a gas pipe. The front of the kiln is provided with a kiln cover, and the side of the kiln is provided with an excess air assembly. The excess air assembly includes a guide pipe, which is connected to the outer wall of the kiln via a bracket. One end of the guide pipe is provided with a connecting pipe, and the other end of the guide pipe is connected to the combustion air duct. The guide pipe and the combustion air duct are connected in communication. A first electromagnetic actuator and a hand valve are connected at the middle position of the guide pipe. Air in the combustion air duct passes sequentially through the guide pipe, the first electromagnetic actuator, the hand valve, and the connecting pipe.

[0007] One end of the gas pipe is connected to a gas branch pipe. The end of the gas branch pipe away from the gas pipe is embedded in the interior of the connecting pipe. A ball valve, a pressure gauge, an electromagnetic proportional valve, and a solenoid valve are installed on the outer wall of the gas branch pipe. The gas in the gas pipe passes through the gas branch pipe in sequence through the ball valve, the pressure gauge, the electromagnetic proportional valve, the solenoid valve, and the connecting pipe. A pressure tapping pipe is also provided on the surface of the combustion air duct. One end of the pressure tapping pipe is connected to the combustion air duct, and the other end is connected to the gas branch pipe. A fine adjustment valve and a second electromagnetic actuator are installed inside the pressure tapping pipe.

[0008] Preferably, the inner wall of the kiln is provided with a smoke exhaust assembly, which includes a smoke exhaust trough. The inner wall of the kiln is provided with a smoke exhaust trough, and a main smoke exhaust diversion pipe is embedded inside the smoke exhaust trough. Smoke exhaust diversion branch pipes are connected to both sides of the main smoke exhaust diversion pipe, and a smoke exhaust branch pipe is connected to the top of the smoke exhaust branch pipe. The top of the smoke exhaust branch pipe is connected to a smoke exhaust duct, and the smoke exhaust duct is installed at the top of the kiln.

[0009] Preferably, the flue gas inside the kiln is transported to the main flue gas diversion pipe through the flue gas diversion branch pipe, and then discharged through the flue gas branch pipe and the flue gas duct. The main flue gas diversion pipe and the flue gas diversion branch pipe are distributed on both sides of the inner wall of the kiln.

[0010] Preferably, one end of the connecting pipe is connected to a burner assembly, the burner assembly includes a housing, and the end of the housing is provided with a gas inlet and an air inlet. The gas inlet is used to connect to a gas branch pipe, and the gas in the gas pipe is transported to the interior of the gas inlet through the gas branch pipe.

[0011] Preferably, the air inlet is used to connect to the guide pipe, and the air in the combustion air duct is transported to the interior of the air inlet through the guide pipe.

[0012] Preferably, the housing is further provided with an electronic spark plug and a flame rod, the electronic spark plug being used for ignition.

[0013] Preferably, the interior of the housing is provided with a primary combustion zone, a secondary combustion zone, a tertiary combustion zone and a quaternary combustion zone, the quaternary combustion zone being close to the gas inlet and the primary combustion zone being furthest from the gas inlet, the primary combustion zone, the secondary combustion zone, the tertiary combustion zone and the quaternary combustion zone being distributed sequentially inside the housing.

[0014] Preferably, the flame rod extends from the outer wall of the housing to the interior of the housing, and the top of the flame rod is located at the outlet of the fourth-stage combustion zone.

[0015] Preferably, both the first and second electromagnetic actuators are electrically connected to the PLC control system. The PLC control system synchronously adjusts the opening of the first electromagnetic actuator to control the combustion air flow rate and adjusts the opening of the second electromagnetic actuator to control the pressure relief of the pressure tapping pipe based on the temperature sensor signal inside the kiln. This adjusts the gas input of the electromagnetic proportional valve and controls the air-to-gas ratio between 10:1 and 18:1.

[0016] Preferably, the diameter of the pressure tapping pipe is 8-12mm, the adjustment accuracy of the fine-tuning valve is ±0.5kPa, the response time of the second electromagnetic actuator is ≤100ms, and the air pressure input fluctuation range of the electromagnetic proportional valve is ≤±3% by adjusting the pressure relief of the pressure tapping pipe.

[0017] The technical effects and advantages of this invention are as follows:

[0018] This invention achieves precise control of the gas input at different temperature ranges under the same air volume by adjusting the pressure input of the proportional valve before the burner, while keeping the gas and combustion air pressure constant. This forms a variable air-gas ratio combustion mode, which not only meets the product temperature and atmosphere requirements, but also achieves a "large air, small flame" combustion mode by reducing the proportional valve pressure input in the low-temperature range. This lowers the flame temperature while using high-speed airflow to stir the temperature field inside the kiln, keeping the temperature difference within ±3℃, uniformly distributing the temperature field and providing an oxidizing atmosphere. In the high-temperature range, the proportional valve pressure input is increased to achieve complete air-gas combustion and improve combustion efficiency. Combined with a 1:50 or higher wide-adjustment burner and an electromagnetic proportional valve that bypasses the small flame gas supply, it ensures that the flame does not go out when switching between large and small flames, and that gas and air are supplied synchronously. The combustion mode can be automatically switched simply by setting the pressure relief device. It has the advantages of high efficiency and energy saving, excellent temperature uniformity, strong combustion stability, and wide process adaptability, effectively solving the problems of large temperature difference at low temperatures, easy flame detachment, local overheating, and high energy consumption in traditional shuttle kilns. Attached Figure Description

[0019] The disclosure of this invention is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this invention. In the drawings, the same reference numerals are used to refer to the same parts:

[0020] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0021] Figure 2 This is a schematic diagram of the structure of the smoke exhaust duct and the smoke exhaust branch pipe of the present invention;

[0022] Figure 3 This is a schematic diagram of the structure of the flue gas trough and kiln wall of the present invention;

[0023] Figure 4 This is a schematic diagram of the structure of the main exhaust pipe and the branch exhaust pipe of the present invention;

[0024] Figure 5 This is a schematic diagram of the combustion-supporting air duct and gas pipe of the present invention;

[0025] Figure 6 For the present invention Figure 5 Schematic diagram of the structure at point A;

[0026] Figure 7 This is a schematic diagram of the gas inlet and electronic spark plug of the present invention;

[0027] Figure 8 This is a schematic cross-sectional view of the secondary and tertiary combustion zones of the present invention;

[0028] Figure 9 This is a schematic diagram of the structure of the secondary combustion zone and the quaternary combustion zone of the present invention;

[0029] Figure 10 This is a schematic diagram of the excess air combustion control principle of the present invention;

[0030] Figure 11 For the present invention Figure 10 A magnified view of a portion of the image.

[0031] Legend: 11. Kiln body; 12. Kiln door; 2. Smoke exhaust assembly; 21. Smoke exhaust duct; 22. Smoke exhaust branch pipe; 23. Smoke exhaust trough; 24. Kiln wall; 25. Main smoke exhaust diversion pipe; 26. Branch smoke exhaust diversion pipe; 3. Excess air assembly; 31. Connecting pipe; 32. Manual valve; 33. Solenoid valve; 34. Solenoid proportional valve; 35. Pressure gauge; 36. First electromagnetic actuator; 37. Ball valve; 38. Second electromagnetic actuator; 39. Conductor pipe; 40. Gas branch pipe; 41. Pressure tapping pipe; 42. Fine adjustment valve; 4. Combustion air duct; 5. Gas pipe; 6. Burner assembly; 61. Gas inlet; 62. Electronic spark plug; 63. Flame rod; 64. Air inlet; 65. Primary combustion zone; 66. Secondary combustion zone; 67. Tertiary combustion zone; 68. Quaternary combustion zone; 69. Shell. Detailed Implementation

[0032] It is readily understood that, based on the technical solution of this invention, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of the invention. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative examples of the technical solution of this invention and should not be considered as the entirety of the invention or as limitations or restrictions on the technical solution of this invention.

[0033] Reference Figure 1 As shown, the present invention provides a technical solution: a shuttle kiln for sanitary ware using excess air combustion technology, comprising a kiln body 11, a combustion air duct 4, and a gas pipe 5. A kiln door 12 is provided on the front of the kiln body 11, and an excess air assembly 03 is provided on the side. The excess air assembly 03 includes a guide pipe 39, which is connected to the outer wall of the kiln body 11 via a bracket. One end of the guide pipe 39 is connected to a connecting pipe 31, and the other end is connected to the combustion air duct 4. A first electromagnetic actuator 36 and a hand valve 32 are connected in parallel at the middle position of the guide pipe 39. Air from the combustion air duct 4 is sequentially transported to the burner via the guide pipe 39, the first electromagnetic actuator 36, the hand valve 32, and the connecting pipe 31. Through the coordinated adjustment of the first electromagnetic actuator 36 and the hand valve 32, the combustion air flow can be precisely controlled, forming a high-speed airflow to stir the temperature field inside the kiln, solving the problem of large temperature differences in the low-temperature section of traditional kilns causing cracking of the green body.

[0034] One end of the gas pipe 5 is connected to the gas branch pipe 40, and the end of the gas branch pipe 40 away from the gas pipe 5 is embedded in the connecting pipe 31. A ball valve 37, a pressure gauge 35, an electromagnetic proportional valve 34, and a solenoid valve 33 are sequentially installed on the outer wall of the gas branch pipe 40. The gas in the gas pipe 5 is delivered to the burner via the gas branch pipe 40, ball valve 37, pressure gauge 35, electromagnetic proportional valve 34, solenoid valve 33, and connecting pipe 31.

[0035] The surface of the combustion air duct 4 is also provided with a pressure tapping pipe 41, one end of which is connected to the combustion air duct 4 and the other end is connected to the gas branch pipe 40; a fine adjustment valve 42 and a second electromagnetic actuator 38 are installed inside the pressure tapping pipe 41. By adjusting the opening of the fine adjustment valve 42 and the second electromagnetic actuator 38, the pressure relief of the pressure tapping pipe 41 can be controlled, thereby indirectly adjusting the air pressure input of the electromagnetic proportional valve 34.

[0036] One end of the gas pipe 5 is rigidly connected to the gas branch pipe 40 via a flange. The end of the gas branch pipe 40 away from the gas pipe 5 is embedded inside the connecting pipe 31 with an interference fit, and a metal spiral wound gasket is installed at the interface to ensure a seal. Along the gas flow direction, the outer wall of the gas branch pipe 40 is sequentially equipped with a ball valve 37, a pressure gauge 35, a solenoid proportional valve 34, and a solenoid valve 33: the ball valve 37 is used to cut off the gas supply during maintenance and to adjust the gas flow rate according to the wind pressure input ratio; the solenoid valve 33 is a safety shut-off valve that closes rapidly within 0.3 seconds in the event of power failure. The gas in the gas pipe 5 passes through the gas branch pipe 40 and then through each control component before being delivered to the burner assembly via the connecting pipe 31, forming a precise and controllable gas supply path.

[0037] A pressure tapping pipe 41 is vertically welded to the surface of the combustion air duct 4. The pressure tapping pipe 41 is made of stainless steel, with one end connected to the combustion air duct 4 via a saddle-shaped interface, and the other end welded to the upstream position of the ball valve 37 of the gas branch pipe 40. A fine-tuning valve 42 and a second electromagnetic actuator 38 are connected in series inside the pressure tapping pipe 41. By adjusting the opening of the fine-tuning valve 42 and the second electromagnetic actuator 38, the pressure relief from the combustion air duct 4 to the gas branch pipe 40 can be changed, thereby indirectly adjusting the air pressure input of the electromagnetic proportional valve 34. This achieves an asymmetric air pressure regulation mode where the total amount of combustion air remains constant and only the amount of gas is adjusted, so that the air-gas ratio is dynamically balanced within the range, meeting the precise control requirements when there is excess air combustion.

[0038] The inner wall of the kiln body 11 is provided with a smoke exhaust assembly 2, which includes a smoke exhaust trough 23. A main smoke exhaust pipe 25 is embedded inside the smoke exhaust trough 23. Smoke exhaust branch pipes 26 are symmetrically connected to both sides of the main smoke exhaust pipe 25. The top end of each branch pipe 26 is connected to a branch exhaust pipe 22, and the top end of each branch pipe 22 is connected to a smoke exhaust duct 21. The flue gas inside the kiln body 11 is centrally discharged to a designated location via the smoke exhaust trough 23, the branch pipes 26, the main smoke exhaust pipe 25, the branch pipes 22, and the smoke exhaust duct 21.

[0039] The kiln wall 24 is the side enclosure structure of the shuttle kiln 11. An exhaust trough 23 is opened on the inner side of the kiln wall 24, and a guide pipe 39 support for the excess air assembly 3 is fixed on the outer side. A through channel for the exhaust diversion branch pipe 26 is pre-embedded in the middle. The exhaust trough 23 on the inner side of the kiln wall 24 is evenly distributed along the length of the kiln, directly receiving the flue gas generated by combustion inside the kiln. The flue gas is guided into the exhaust diversion branch pipe 26 by the negative pressure inside the trough. The exhaust diversion branch pipe 26 pre-embedded inside the kiln wall 24 is inclined upwards at 45°, guiding the flue gas to the exhaust duct 21 at the top of the kiln, preventing the flue gas from stagnating inside the kiln.

[0040] One end of the connecting pipe 31 is connected to the burner assembly 6. The burner assembly 6 includes a burner housing 69, and the end of the burner housing 69 is provided with a gas inlet 61 and an air inlet 64.

[0041] Gas inlet 61 is connected to gas branch pipe 40. Gas in gas pipe 5 is transported to gas inlet 61 through gas branch pipe 40. Air inlet 64 is connected to conduit 39. Air in combustion air pipe 4 is transported to air inlet 64 through conduit 39.

[0042] An electronic spark plug 62 and a flame rod 63 are disposed inside the burner housing 69, and a primary combustion zone 65, a secondary combustion zone 66, a tertiary combustion zone 67, and a quaternary combustion zone 68 are sequentially distributed along the gas flow direction. The quaternary combustion zone 68 is close to the gas inlet 61, while the primary combustion zone 65 is far from the gas inlet 61. The flame rod 63 extends from the outer wall of the burner housing 69 into the interior, and its tip is located at the outlet of the quaternary combustion zone 68.

[0043] Both the first electromagnetic actuator 36 and the second electromagnetic actuator 38 are electrically connected to the PLC control system. The PLC control system adjusts the opening of the first electromagnetic actuator 36 synchronously to control the combustion air flow rate according to the temperature sensor signal inside the kiln, and adjusts the opening of the second electromagnetic actuator 38 to control the pressure relief of the pressure tapping pipe 41, thereby adjusting the gas input of the electromagnetic proportional valve 34 and controlling the air-to-gas ratio between 10:1 and 18:1.

[0044] The pressure tapping pipe 41 has a diameter of 8-12mm, the adjustment accuracy of the fine-tuning valve 42 is ±0.5kPa, the response time of the second electromagnetic actuator 38 is ≤100ms, and the pressure relief of the pressure tapping pipe 41 can be adjusted to ensure that the air pressure input fluctuation range of the electromagnetic proportional valve 34 is ≤±3%.

[0045] Both the first electromagnetic actuator 36 and the second electromagnetic actuator 38 are electrically connected to the PLC control system, forming an intelligent combustion control closed loop. The PLC control system accurately determines the current heating stage of the kiln by real-time acquisition of temperature sensor signals inside the kiln, and accordingly adjusts the opening of the first electromagnetic actuator 36 to control the combustion air flow, while simultaneously adjusting the opening of the second electromagnetic actuator 38 to control the pressure relief of the pressure tapping pipe 41, thereby indirectly adjusting the gas input of the electromagnetic proportional valve 34. This control method allows for flexible adjustment of the mixing ratio of combustion air and gas, enabling dynamic switching of the air-gas ratio within a wide range, readily meeting the combustion state requirements of different process stages.

[0046] The pressure tapping pipe 41, along with the fine-tuning valve 42 and the second electromagnetic actuator 38, constitutes a precision air pressure regulation unit. By accurately controlling the pressure relief of the pressure tapping pipe, the air pressure input of the electromagnetic proportional valve 34 can be adjusted in real time. This regulation mechanism employs asymmetric control logic, adjusting only the gas input while ensuring a stable total combustion air volume, achieving an innovative control mode of "constant air volume, adjustable gas volume." The system can automatically switch combustion modes according to changes in kiln temperature. In the low-temperature stage, it increases the proportion of combustion air to create excess air combustion, reducing flame temperature and enhancing airflow stirring. In the high-temperature stage, it optimizes the air-to-air ratio to achieve complete combustion, ensuring simultaneous improvement in kiln temperature uniformity and combustion efficiency, effectively solving technical problems such as large low-temperature temperature differences and poor flame stability in traditional shuttle kilns.

[0047] Working principle:

[0048] When the kiln 11 is started, the PLC control system initializes, opens the hand valve 32 and ball valve 37, and closes the solenoid valve 33. The combustion air enters the guide pipe 39 through the combustion air pipe 4, passes through the first solenoid actuator 36 and the hand valve 32 to reach the air inlet 64 of the burner assembly 6. At this time, the second solenoid actuator 38 of the pressure tapping pipe 41 is closed, and the fine adjustment valve 42 is at its initial opening.

[0049] During the low-temperature excess air combustion stage, when the kiln temperature is ≤300℃, the PLC system triggers the excess air mode. At this time, the second electromagnetic actuator 38 opens, and the fine adjustment valve 42 adjusts the pressure relief amount, so that the pressure tapping pipe 41 takes pressure from the combustion air pipe 4 and releases pressure to the gas branch pipe 40, reducing the air pressure input of the electromagnetic proportional valve 34, reducing the gas volume, and gradually increasing the air-to-gas ratio from 10:1 to 18:1.

[0050] Next, the gas flows through the gas pipe 5 and the gas branch pipe 40, passing through the ball valve 37, pressure gauge 35, electromagnetic proportional valve 34, and electromagnetic valve 33 in sequence, and enters the burner assembly 6 from the gas inlet 61.

[0051] First, the combustion-supporting air and fuel gas are premixed in the primary combustion zone 65. Then, air is introduced in stages in the secondary combustion zone 66. Next, the combustion zone 67 is expanded and the combustion speed is reduced. Finally, the flame is stabilized in the quaternary combustion zone 68, forming a high-speed stirring airflow, so that the temperature difference in the kiln is ≤±3℃.

[0052] During normal combustion in the high-temperature section, when the kiln temperature exceeds 300℃, the PLC system gradually shuts down the second electromagnetic actuator 38, the fine-tuning valve 42 reduces the pressure relief, the air-gas ratio is adjusted back from 18:1 to 10:1, the gas volume increases, and the combustion temperature rises to 1220℃, meeting the firing requirements.

[0053] During the exhaust process, the flue gas inside the kiln enters the main exhaust diversion pipe 25 through the exhaust trough 23, and is discharged through the exhaust diversion branch pipe 26, the exhaust branch pipe 22, and the exhaust duct 21. The flame rod 63 monitors the flame status in real time. When flameout is detected, the PLC system immediately closes the solenoid valve 33 and the solenoid proportional valve 34 to cut off the gas supply and ensure safety.

[0054] The technical scope of this invention is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this invention, and all such modifications and variations should fall within the protection scope of this invention.

Claims

1. A shuttle kiln for sanitary ware of the excess air combustion technique, characterized in that, The utility model provides a kiln, combustion air pipe and gas pipe, the front of kiln is equipped with kiln cover, the lateral surface of kiln is equipped with excess air component, excess air component includes lead -through pipe, lead -through pipe is connected on the outer wall of kiln through support, one end of lead -through pipe is equipped with connecting pipe, the other end of lead -through pipe is connected with combustion air pipe, lead -through pipe and combustion air pipe are communicated, first electromagnetic actuator and hand valve are connected in the middle position of lead -through pipe, air in combustion air pipe passes through lead -through pipe, first electromagnetic actuator, hand valve and connecting pipe in proper order, One end of gas pipe is connected with gas branch pipe, the end away from gas pipe of gas branch pipe is embedded to the inside of connecting pipe, ball valve, pressure gauge, electromagnetic proportional valve and electromagnetic valve are arranged on the outer wall of gas branch pipe, the gas in gas pipe passes through ball valve, pressure gauge, electromagnetic proportional valve, electromagnetic valve and connecting pipe in proper order through gas branch pipe, the surface of combustion air pipe is further equipped with pressure tapping pipe, one end of pressure tapping pipe is connected with combustion air pipe, the other end is connected with gas branch pipe, fine adjustment valve and second electromagnetic actuator are installed in the inside of pressure tapping pipe.

2. The excess air combustion technology sanitary ware shuttle kiln according to claim 1, characterized in that: The inner wall of kiln is provided with a smoke exhaust assembly, the smoke exhaust assembly includes a smoke exhaust groove, the inner wall of the kiln is provided with a smoke exhaust groove, the smoke exhaust groove is embedded with a smoke exhaust main pipe, the smoke exhaust main pipe is connected with smoke exhaust branch pipes on both sides, the smoke exhaust branch pipes are connected with smoke exhaust sub-pipes at the top, and the smoke exhaust sub-pipes are connected with smoke exhaust air pipes at the top.

3. The excess air combustion technology sanitary ware shuttle kiln according to claim 2, characterized in that: The smoke in the kiln is transported to the inside of the smoke exhaust main pipe through the smoke exhaust branch pipes, and then to the smoke exhaust sub-pipes and the smoke exhaust air pipes for exhaust, and the smoke exhaust main pipe and the smoke exhaust branch pipes are distributed on both sides of the inner wall of the kiln.

4. The excess air combustion technology sanitary ware shuttle kiln according to claim 1, characterized in that: One end of the connecting pipe is connected with a burner assembly, the burner assembly includes a housing, a gas inlet and an air inlet are formed at the end of the housing, the gas inlet is connected with the gas branch pipe, and the gas in the gas pipe is transported to the inside of the gas inlet through the gas branch pipe.

5. The excess air combustion technology sanitary ware shuttle kiln according to claim 4, characterized in that: The air inlet is connected with the lead-through pipe, and the air in the combustion air pipe is transported to the inside of the air inlet through the lead-through pipe.

6. The excess air combustion technology sanitary ware shuttle kiln according to claim 5, characterized in that: The inside of the housing is also provided with an electronic spark plug and a flame rod, and the electronic spark plug is used for ignition operation.

7. The excess air combustion technology sanitary shuttle kiln according to claim 6, characterized in that: The inside of the housing is provided with a first combustion zone, a second combustion zone, a third combustion zone and a fourth combustion zone, the fourth combustion zone is close to the gas inlet, the first combustion zone is farthest from the gas inlet, and the first combustion zone, the second combustion zone, the third combustion zone and the fourth combustion zone are distributed in the inside of the housing in sequence.

8. The excess air combustion technology sanitary ware shuttle kiln according to claim 7, characterized in that: The flame rod extends from the outer wall of the housing to the inside of the housing, and the top end of the flame rod is arranged at the outlet of the fourth combustion zone.

9. The excess air combustion technology sanitary ware shuttle kiln according to claim 1, characterized in that: The first electromagnetic actuator and the second electromagnetic actuator are electrically connected with a PLC control system, the PLC control system adjusts the opening of the first electromagnetic actuator to control the combustion-supporting air flow according to the temperature sensor signal in the kiln, adjusts the opening of the second electromagnetic actuator to control the pressure relief amount of the pressure-taking pipe, thereby adjusting the gas input amount of the electromagnetic proportional valve, and controls the air-gas ratio to be between 10:1 and 18:

1.

10. The excess air combustion technology sanitary ware shuttle kiln according to claim 1, characterized in that: The pipe diameter of the pressure-taking pipe is 8-12 mm, the adjustment accuracy of the fine adjustment valve is ±0.5 kPa, the response time of the second electromagnetic actuator is ≤100 ms, and the pressure relief amount of the pressure-taking pipe is adjusted, so that the fluctuation range of the air pressure input of the electromagnetic proportional valve is ≤±3%.

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