Combustion device of walking beam furnace

Abstract

The utility model discloses a stepping type heating furnace combustion device which comprises a stepping type heating furnace, an air pipeline, an air adjusting valve, a fuel gas pipeline, a fuel gas electromagnetic valve, an air-fuel proportional valve and a controller, and at least one heating assembly is arranged in the stepping type heating furnace. One end of the air pipeline is communicated with the heating assembly, and the other end of the air pipeline is communicated with external air; the air regulating valve is mounted on the air pipeline, and the air regulating valve is suitable for regulating air passing through the air pipeline; one end of the gas pipeline is communicated with the heating assembly, and the other end of the gas pipeline is communicated with a gas source; a fuel gas electromagnetic valve and an air-fuel proportional valve are sequentially arranged in the fuel gas conveying direction of the fuel gas pipeline. And the fuel gas electromagnetic valve is mounted on the fuel gas pipeline. The air-fuel ratio adjusting precision and stability can be improved, and therefore the overall combustion efficiency and operation reliability are improved.

Description

Technical Field

[0001] The utility model relates to a combustion device for a walking beam reheating furnace, belonging to the technical field of reheating furnaces. Background Art

[0002] At present, the walking beam reheating furnace is a device widely used in industrial heating processes, usually used in metal heat treatment, glass manufacturing, ceramic sintering and other technological processes. This kind of reheating furnace usually generates heat by igniting the mixture of air and gas to heat the materials in the furnace.

[0003] After retrieving the prior art, it is found that the Chinese patent with the publication number CN205717171U discloses a heating device for a gas heating furnace. In this patent, by setting flow detection elements, the control of adjusting the ratio of air and fuel is realized. However, it is found in the use process that the use of multiple flow detection elements increases the cost and failure rate and reduces the overall reliability. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to overcome the defects of the prior art and provide a combustion device for a walking beam reheating furnace, which can improve the accuracy and stability of air-fuel ratio adjustment, thereby improving the overall combustion efficiency and operation reliability.

[0005] In order to solve the above technical problem, the technical solution of the utility model is: a combustion device for a walking beam reheating furnace, used for a walking beam reheating furnace, comprising:

[0006] A heating component;

[0007] An air pipeline, one end of the air pipeline is communicated with the heating component, and the other end of the air pipeline is communicated with external air;

[0008] An air regulating valve, the air regulating valve is installed on the air pipeline, and the air regulating valve is suitable for regulating the flow rate of air passing through the air pipeline;

[0009] A gas pipeline, one end of the gas pipeline is communicated with the heating component, and the other end is communicated with a gas source;

[0010] A gas solenoid valve and an air-fuel ratio valve are sequentially arranged along the gas transmission direction of the gas pipeline;

[0011] The gas solenoid valve is installed on the gas pipeline;

[0012] The air-fuel ratio valve is installed on the gas pipeline. An air pressure feedback port is provided on the air-fuel ratio valve. A pressure feedback pipe is provided between the air-fuel ratio valve and the air pipeline. One end of the pressure feedback pipe is communicated with the air pressure feedback port, and the other end is communicated with the air pipeline. The air-fuel ratio valve is adapted to adjust the flow rate of the gas in the gas pipeline according to the pressure feedback from the air pressure feedback port;

[0013] A controller, which is respectively connected to the air regulating valve and the gas solenoid valve. The controller is adapted to control the actions of the air regulating valve and the gas solenoid valve.

[0014] Furthermore, in order to improve the air introduction efficiency, the other end of the air pipeline is also connected with a blower adapted to introduce external air.

[0015] Furthermore, in order to better coordinate the control of the gas input and the ignition of the heating component, an ignition component is also provided in the heating component;

[0016] The controller includes a main controller and an ignition controller, and the main controller is electrically connected to the ignition controller;

[0017] The main controller is connected to the air regulating valve;

[0018] The ignition controller is connected to the gas solenoid valve and the ignition component;

[0019] The main controller is adapted to control the action of the air regulating valve and control the actions of the gas solenoid valve and the ignition component through the ignition controller.

[0020] Furthermore, the walking beam reheating furnace combustion device further includes a temperature detection component, which is installed in the walking beam reheating furnace. The temperature detection component is adapted to detect the temperature in the walking beam reheating furnace and issue a temperature signal;

[0021] The main controller is connected to the temperature detection component. The main controller is adapted to receive the temperature signal issued by the temperature detection component and control the action of the air regulating valve according to the temperature signal.

[0022] Furthermore, a specific type of the temperature detection component is provided. The temperature detection component is a thermocouple.

[0023] Furthermore, a specific type of the heating component is provided. The heating component is a burner.

[0024] Further, for more precise control of the air flow rate and manual adjustment as a backup, the walking-beam reheating furnace combustion device further includes an air manual control valve, which is arranged on the air pipeline, between the heating component and the air control valve, and the air manual control valve is adapted to manually control the air flow rate in the air pipeline.

[0025] Further, for precise control of the air-fuel ratio and provision of a manual adjustment option, the walking-beam reheating furnace combustion device further includes a manual linear control valve, which is arranged on the gas pipeline, between the air-fuel ratio control valve and the heating component.

[0026] Further, for precise control of the gas flow rate and safe cut-off, the walking-beam reheating furnace combustion device further includes a gas manual cut-off valve, which is installed at the inlet of the gas pipeline.

[0027] Further, for rapid and fine adjustment of the gas flow rate, the gas solenoid valve includes a gas quick-opening solenoid valve and a gas slow-opening solenoid valve connected in series on the gas pipeline.

[0028] By adopting the above technical solutions, the utility model has the following beneficial effects:

[0029] In the utility model, the controller first controls the air control valve to open, so that air enters the heating component from the air pipeline, and then the controller controls the gas solenoid valve to open, so that gas enters from the gas pipeline. When passing through the air-fuel ratio control valve, the air-fuel ratio control valve adjusts the gas flow rate in the gas pipeline according to the pressure feedback from the pressure feedback pipe at the air pressure feedback port, to achieve a suitable air / gas ratio. Finally, the air and gas enter the heating component together and are ignited in the heating component to heat the walking-beam reheating furnace.

[0030] The temperature detection component in the walking-beam reheating furnace detects the temperature in the walking-beam reheating furnace and issues a temperature signal. During actual operation, the temperature detection component monitors the temperature in the walking-beam reheating furnace in real time and transmits the temperature signal to the controller, and the controller adjusts the air flow rate through the air control valve accordingly to improve the combustion efficiency.

[0031] In addition, the other end of the air duct is connected to a blower, which can improve the efficiency of air introduction, ensure stable air supply during the combustion process, and further optimize the combustion effect. The ignition component in the heating component cooperates with the main controller through the ignition controller, which can accurately control the ignition timing and ensure the stability and safety of combustion. The air regulating valve and the manual air regulating valve can use both electric and manual regulating functions simultaneously, which not only realizes control but also provides flexibility for manual intervention, ensuring the stability and reliability of the system under different working conditions. In addition, a combination of a fast-opening gas solenoid valve and a slow-opening gas solenoid valve is adopted in the gas solenoid valve, which ensures the high efficiency of the combustion process and improves the safety and response speed of the device.

[0032] In summary, through the reasonable ratio of air to gas, precise temperature control, the design of combining controller control with manual regulation, and efficient and safe gas flow control, the utility model has the beneficial effects of improving combustion efficiency, reducing energy waste, and reducing harmful gas emissions, and can well meet the requirements of modern industry for energy conservation, emission reduction, and efficient combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic structural principle diagram of the combustion device of the walking beam reheating furnace of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0034] In order to make the content of the present utility model easier to be clearly understood, the present utility model will be further described in detail below according to specific embodiments in conjunction with the drawings.

[0035] As Figure 1 shown, a combustion device for a walking beam reheating furnace, which is used for a walking beam reheating furnace, includes:

[0036] A heating component 1;

[0037] An air duct 2, one end of the air duct 2 is connected to the heating component 1 in communication, and the other end of the air duct 2 is connected to the external air in communication;

[0038] An air regulating valve 21, the air regulating valve 21 is installed on the air duct 2, and the air regulating valve 21 is adapted to regulate the flow rate of the air passing through the air duct 2;

[0039] A gas duct, one end of the gas duct is connected to the heating component 1 in communication, and the other end is connected to a gas source in communication;

[0040] A gas solenoid valve and an air-fuel ratio valve 51 are arranged in sequence along the gas transmission direction of the gas duct;

[0041] The gas solenoid valve is installed on the gas duct;

[0042] The air-fuel ratio valve 51 is installed on the gas pipeline. The air-fuel ratio valve 51 is provided with an air pressure feedback port. A pressure feedback pipe is provided between the air-fuel ratio valve 51 and the air pipeline 2. One end of the pressure feedback pipe is communicated with the air pressure feedback port, and the other end is communicated with the air pipeline 2. The air-fuel ratio valve 51 is adapted to adjust the flow rate of the gas in the gas pipeline according to the pressure feedback by the air pressure feedback port.

[0043] A controller, which is respectively connected to the air regulating valve 21 and the gas solenoid valve. The controller is adapted to control the actions of the air regulating valve 21 and the gas solenoid valve.

[0044] In this embodiment, as Figure 1 shown, in the present utility model, the controller first controls the air regulating valve 21 to open, so that air enters the heating assembly 1 from the air pipeline 2. Then the controller controls the gas solenoid valve to open, so that gas enters from the gas pipeline. When the gas passes through the air-fuel ratio valve 51, the air-fuel ratio valve 51 adjusts the flow rate of the gas in the gas pipeline according to the pressure feedback by the pressure feedback pipe on the air pressure feedback port, to achieve a suitable air / gas ratio. Finally, the air and the gas enter the heating assembly 1 together and are ignited in the heating assembly 1 to heat the walking beam reheating furnace.

[0045] The main workpiece processed in this embodiment is round steel pipe blanks, and the gas used is natural gas.

[0046] The main purpose of this embodiment is to solve the problems of insufficient combustion, excessive combustion, and air consumption during the heating process of round steel pipe blanks. Among them, insufficient combustion will cause small black skins on the outer surface of the steel pipe and uneven wall thickness of the steel pipe. Excessive combustion will cause oxidation and burning loss of the billet and waste of natural gas. The problem of air consumption is mainly manifested in that when changing the working dies in the workshop, it is impossible to achieve automatic temperature reduction to reduce the waste of natural gas consumption.

[0047] The controller adjusts the air regulating valve to make the heating assembly 1 have three states: high fire, low fire, and flameout. The controller uses a three-position pulse linear regulation control method to control the air regulating valve, and real-time corrects the air flow rate for combustion support to adjust the power of the heating assembly 1, ensuring that the error between the actual combustion temperature and the process requirement temperature is not higher than ±10°C. When the furnace temperature in the heating zone reaches a certain temperature, the controller controls the air regulating valve to the closed position or the low position for low-fire and flameout heat preservation operations to reduce natural gas consumption.

[0048] Specifically, as Figure 1 shown, the other end of the air pipeline 2 is also connected with a blower 6 adapted to introduce external air.

[0049] In this embodiment, as Figure 1As shown, the blower 6 connected to the other end of the air duct 2 is mainly used to supply stable and sufficient external air to the walking beam reheating furnace. The installation position of the blower 6 is at the end of the air duct 2. By introducing external air, it can ensure that the walking beam reheating furnace always has sufficient oxygen supply during operation, thus ensuring the adequacy and stability of combustion. The rotational speed of the blower 6 can be adjusted by the controller, so that the air volume entering the air duct 2 can be adjusted according to different combustion requirements.

[0050] When the system starts, the blower 6 is first turned on to supply external air to the air duct 2. The air enters the air duct through the air regulating valve. The blower 6 can not only provide a stable air flow rate, but also flexibly adjust the air supply volume according to the change of the internal temperature of the walking beam reheating furnace to achieve precise control of the combustion process. At the same time, the blower 6 and the air regulating valve work together to ensure that the air flow velocity and pressure are always within an appropriate range to ensure the combustion efficiency and heat transfer effect in the walking beam reheating furnace.

[0051] In other possible embodiments, the working state of the blower 6 can also be connected to the temperature detection element, and the controller automatically adjusts the rotational speed of the blower according to the temperature change in the walking beam reheating furnace to ensure that the air supply is reduced when the temperature is high to prevent excessive combustion, and the air supply is increased when the temperature is low to ensure sufficient combustion. In addition, the blower 6 can also be equipped with a pressure sensor to detect the pressure change in the air duct 2 in real time to ensure the stability and safety of the air supply.

[0052] Specifically, as Figure 1 shown, an ignition component is also provided in the heating component 1;

[0053] The controller includes a main controller 31 and an ignition controller 32, and the main controller 31 is electrically connected to the ignition controller 32;

[0054] The main controller 31 is connected to the air regulating valve 21;

[0055] The ignition controller 32 is connected to the gas solenoid valve and the ignition component;

[0056] The main controller 31 is adapted to control the action of the air regulating valve 21 and control the action of the gas solenoid valve and the ignition component through the ignition controller 32.

[0057] Specifically, as Figure 1 shown, this embodiment further includes a temperature detection element. The temperature detection element is installed in the walking beam reheating furnace and is adapted to detect the temperature in the walking beam reheating furnace and send out a temperature signal;

[0058] The main controller 31 is connected to the temperature detector. The main controller 31 is adapted to receive the temperature signal sent by the temperature detector and control the operation of the air regulating valve 21 according to the temperature signal.

[0059] In this embodiment, as Figure 1 shown, the ignition component in the heating component 1 is used to ignite the gas. The ignition component cooperates with the gas solenoid valve through the ignition controller 32 to ensure the synchronization of the gas supply and the ignition operation during the ignition process. When the ignition controller 32 receives the control signal sent by the main controller 31, the ignition controller 32 will first open the gas solenoid valve to ensure that the gas flows into the heating component 1 as required and start the ignition component to complete the ignition operation.

[0060] The main controller 31 monitors the temperature in the step-type heating furnace in real time through its connection with the temperature detector. When the detected temperature is lower than the preset value, the main controller 31 controls the air regulating valve 21 to increase the opening degree, and the heating component 1 switches to high fire.

[0061] The ignition controller 32 is a prior art, and this embodiment will not elaborate on it. There is also WinCC control and real-time monitoring in this embodiment, which is connected to the controller, and the controller can specifically be a PLC.

[0062] Specifically, the temperature detector is a thermocouple.

[0063] In this embodiment, as Figure 1 shown, as the core component for temperature detection, the thermocouple can accurately and real-time sense the temperature change in the step-type heating furnace and convert it into an electrical signal to be transmitted to the main controller 31. The thermocouple has the characteristics of fast response speed and high measurement accuracy, and is especially suitable for such heating devices that require real-time temperature control, ensuring more accurate temperature control during the heating process and avoiding the phenomena of overheating or insufficient temperature.

[0064] When the temperature in the step-type heating furnace reaches the predetermined set value, the thermocouple will continuously monitor the temperature and feedback the data to the main controller 31. If the main controller 31 detects that the temperature is too high or too low, it will automatically adjust the operations of the air regulating valve and the gas solenoid valve according to the temperature signal to precisely control the combustion process and ensure that the temperature in the furnace body is maintained within the optimal range. This not only improves the combustion efficiency but also extends the service life of the equipment.

[0065] In addition, in other possible implementation manners, the thermocouple can be installed at different positions of the step-type heating furnace to achieve multi-point temperature monitoring. This design can more comprehensively monitor the temperature distribution inside the furnace body and avoid the occurrence of local overheating or low temperature. By comprehensively regulating the temperature in different areas, the main controller 31 can further optimize the heating effect, ensure the temperature uniformity inside the entire step-type heating furnace, and meet different process requirements.

[0066] When the workshop stops production for product changeover, in order to better save energy and reduce consumption, a thermocouple is used for closed-loop detection of the furnace temperature. According to the signal feedback from the in-furnace temperature on-site, the controller performs a difference operation between the real-time temperature and the set temperature, and outputs a pulse to adjust the corresponding output opening degree, match the corresponding gas volume, and form a closed-loop temperature control. Ensure that the actual combustion temperature remains at the set cooling temperature, avoid empty consumption, and achieve the purpose of energy saving and consumption reduction.

[0067] Specifically, as Figure 1 shown, the heating component 1 is a burner.

[0068] In this embodiment, the burner is responsible for igniting an appropriate proportion of gas and air, thereby providing heat source for the walking beam reheating furnace. During operation, the gas enters the burner through the gas pipeline, and at the same time, the air enters the burner through the air pipeline. The ignition component ignites the mixed gas under the control of the ignition controller to generate a stable flame.

[0069] In addition, the structural design of the burner itself can be appropriately adjusted according to different application scenarios. In some embodiments, the shape, size, and material of the burner can be optimized according to specific working environments such as high temperature and high pressure to meet the usage requirements of different walking beam reheating furnaces.

[0070] Specifically, as Figure 1 shown, this embodiment also includes a manual air regulating valve 22, which is arranged on the air pipeline 2, between the heating component 1 and the air regulating valve 21. The manual air regulating valve 22 is suitable for manually controlling the air flow rate in the air pipeline 2.

[0071] In this embodiment, as Figure 1 shown, the manual air regulating valve 22 provides a backup manual control method. In some cases, such as during initial commissioning or equipment maintenance, the operator can manually adjust the air flow rate through the manual regulating valve 22. As an auxiliary device, the manual air regulating valve 22 ensures that even when the automatic regulation function fails, the operator can manually intervene in the air supply to ensure the normal operation of the equipment.

[0072] Specifically, as Figure 1 shown, this embodiment also includes a manual linear regulating valve 52, which is arranged on the gas pipeline, between the air-fuel ratio valve 51 and the heating component 1.

[0073] In this embodiment, as Figure 1As shown, the manual linear regulating valve 52 provides the ability of manual intervention. When the air-fuel ratio valve 51 fails or under special working conditions, the operator can manually adjust the gas flow accurately through the manual linear regulating valve 52. Due to the linear regulation characteristics, the operator can gradually adjust the gas flow according to the actual combustion state to ensure the stability of the combustion process.

[0074] Specifically, Figure 1 As shown, this embodiment further includes a manual gas shut-off valve 41, which is installed at the inlet of the gas pipeline.

[0075] In this embodiment, if Figure 1 As shown, the manual gas shut-off valve 41 is located in the upstream part of the gas pipeline and is mainly used for emergency shut-off or opening of the gas supply under manual operation. When the system needs to be maintained or repaired or an emergency occurs, the operator can quickly cut off the gas flow through the manual shut-off valve 41 to ensure the safety of the equipment and the operator.

[0076] Specifically, Figure 1 As shown, the gas solenoid valve includes a gas fast-opening solenoid valve 421 and a gas slow-opening solenoid valve 422 which are connected in series on the gas pipeline.

[0077] In this embodiment, if Figure 1 As shown, the gas solenoid valve is composed of a gas quick-opening solenoid valve 421 and a gas slow-opening solenoid valve 422 connected in series, and the two work together to control the opening speed of the gas. The function of the gas quick-opening solenoid valve 421 is to quickly open the gas pipeline, and when a quick response is required, ensure that the gas can quickly enter the heating component 1, thereby achieving rapid ignition or heating. This design is suitable for scenes that require rapid temperature rise, which can effectively shorten the heating time and improve the working efficiency of the walking beam heating furnace.

[0078] On the other hand, the slow-opening gas solenoid valve 422 is used in certain working conditions that require slow temperature rise or precise control of gas supply. It can precisely control the gradual increase in gas flow to prevent temperature overshoot or unstable combustion caused by too fast introduction of gas. The design of this slow-opening valve ensures that the gas flow changes gradually during the startup and shutdown process, preventing pressure fluctuations or safety hazards caused by sudden airflow shocks to the system, improving the control accuracy and safety of the gas system, and is suitable for different heating needs and working conditions.

[0079] In the above-described specific embodiments, the technical problems solved by the present utility model, the technical solutions, and the beneficial effects have been further described in detail. It should be understood that the above are only specific embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A combustion device for a walking beam reheating furnace, which is used for a walking beam reheating furnace, is characterized in that, Comprising: A heating component (1); An air duct (2), one end of the air duct (2) is in communication with the heating component (1), and the other end of the air duct (2) is in communication with the external air; An air regulating valve (21), the air regulating valve (21) is installed on the air duct (2), and the air regulating valve (21) is adapted to regulate the flow rate of the air passing through the air duct (2); A gas pipeline, one end of the gas pipeline is in communication with the heating component (1), and the other end is in communication with a gas source; A gas solenoid valve and an air-fuel ratio valve (51) are arranged in sequence along the gas transmission direction of the gas pipeline; The gas solenoid valve is installed on the gas pipeline; The air-fuel ratio valve (51) is installed on the gas pipeline, an air pressure feedback port is provided on the air-fuel ratio valve (51), a pressure feedback pipe is provided between the air-fuel ratio valve (51) and the air duct (2), one end of the pressure feedback pipe is in communication with the air pressure feedback port, and the other end is in communication with the air duct (2), and the air-fuel ratio valve (51) is adapted to regulate the flow rate of the gas in the gas pipeline according to the pressure feedback by the air pressure feedback port; A controller, the controller is respectively connected to the air regulating valve (21) and the gas solenoid valve, and the controller is adapted to control the actions of the air regulating valve (21) and the gas solenoid valve.

2. The step-type heating furnace combustion device according to claim 1, characterized in that The other end of the air duct (2) is further connected with a blower (6) adapted to introduce external air.

3. The step-type heating furnace combustion device according to claim 1, characterized in that An ignition component is further provided in the heating component (1); The controller includes a main controller (31) and an ignition controller (32), and the main controller (31) is electrically connected to the ignition controller (32); The main controller (31) is connected to the air regulating valve (21); The ignition controller (32) is connected to the gas solenoid valve and the ignition component; The main controller (31) is adapted to control the action of the air regulating valve (21), and control the actions of the gas solenoid valve and the ignition component through the ignition controller (32).

4. The step-type heating furnace combustion device according to claim 3, characterized in that It further includes a temperature detection component, the temperature detection component is installed in the step-type heating furnace, and the temperature detection component is adapted to detect the temperature in the step-type heating furnace and issue a temperature signal; The main controller (31) is connected to the temperature detection component, and the main controller (31) is adapted to receive the temperature signal issued by the temperature detection component and control the action of the air regulating valve (21) according to the temperature signal.

5. The step-type heating furnace combustion device according to claim 4, characterized in that The temperature detection component is a thermocouple.

6. The step-type heating furnace combustion device according to claim 1, characterized in that The heating component (1) is a burner.

7. The step-type heating furnace combustion device according to claim 1, characterized in that It further includes a manual air regulating valve (22), which is arranged on the air pipeline (2) and located between the heating component (1) and the air regulating valve (21), and the manual air regulating valve (22) is adapted to manually control the air flow rate in the air pipeline (2).

8. The step-type heating furnace combustion device according to claim 1, wherein it further includes a manual linear regulating valve (52), which is arranged on the gas pipeline and located between the air-fuel ratio valve (51) and the heating component (1).

9. The step-type heating furnace combustion device according to claim 1, wherein it further includes a manual gas cut-off valve (41), which is installed at the inlet of the gas pipeline.

10. The step-type heating furnace combustion device according to claim 1, wherein the gas solenoid valve includes a gas quick-opening solenoid valve (421) and a gas slow-opening solenoid valve (422) connected in series on the gas pipeline.

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