Industrial heating furnace temperature control system

Abstract

The utility model provides a temperature control system for an industrial heating furnace, which comprises a temperature sensor, a temperature controller, a power controller, a heating pipe, a frequency converter, a PLC (programmable logic controller), a frequency converter, a wind speed sensor, a motor and an HMI (human-machine interaction) interface, the power controller is further connected with the heating pipe, the PLC is further connected with the wind speed sensor, the frequency converter and the HMI, and the frequency converter is further connected with the motor. On the other hand, a frequency conversion fan can increase the wind speed to realize rapid cooling; on the contrary, when the temperature is too low, the controller can drive the heating pipe to heat, and meanwhile the fan appropriately reduces the air speed to achieve rapid temperature rise. The temperature fluctuation and the response speed are better than those of traditional temperature control.

Description

Technical Field

[0001] The utility model relates to the technical field of temperature control, in particular to a temperature control system for an industrial heating furnace. Background Art

[0002] Existing temperature control:

[0003] In most industrial processes requiring heating, temperature control is a key factor in ensuring product quality and production efficiency. Currently, common temperature control equipment, such as heating furnaces, typically utilizes a combination of temperature sensors and heating tubes to achieve precise temperature control. Larger furnaces require multiple temperature control points to achieve a consistent temperature balance, which increases unnecessary costs.

[0004] Problems with existing technologies:

[0005] 1. Once the signal encounters interference, it is easy to cause unstable temperature control of the furnace cavity and large temperature fluctuations.

[0006] 2. The temperature in the furnace cavity is uneven, and the difference between hot and cold is too large. Utility Model Content

[0007] In order to make up for the deficiencies of the prior art, the embodiments of the present application solve the problems in the prior art by providing an industrial heating furnace temperature control system.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0009] An industrial heating furnace temperature control system includes a temperature sensor, a temperature controller, a power controller, a heating tube, a frequency converter, a PLC, a frequency converter, a wind speed sensor, a motor and an HMI human-machine interface. The temperature sensor is connected to the temperature controller, the temperature controller is also connected to the power controller and the PLC respectively, the power controller is also connected to the heating tube, the PLC is also connected to the wind speed sensor, the frequency converter and the HMI human-machine interface respectively, and the frequency converter is also connected to the motor.

[0010] As a further technical solution of the present invention: the temperature sensor is one of a thermal resistor, a thermocouple, and an infrared sensor.

[0011] As a further technical solution of the present invention: the temperature control unit is composed of a temperature controller and a power regulator.

[0012] As a further technical solution of the present invention: the variable frequency fan is composed of a frequency converter and an electric motor.

[0013] As a further technical solution of the present invention: the temperature sensor and the heating tube are installed in the heating furnace cavity.

[0014] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0015] This design uses a heating + cooling mode for more precise control. When the temperature inside the furnace chamber is too high, the controller can turn off the heating tubes while the variable frequency fan increases the wind speed for rapid cooling. Conversely, when the temperature is too low, the controller drives the heating tubes to heat while the fan speed is reduced to a moderate degree for rapid heating. This has advantages over traditional temperature control in terms of temperature fluctuation and response speed.

[0016] 2. In large heating furnace equipment, the use of this design can greatly reduce energy consumption and costs. The design of frequency conversion and temperature controller reduces energy loss. The combination of PLC and human-machine interface achieves the purpose of intelligent control, which can make the operation steps simpler. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a module diagram of the temperature control system of an industrial heating furnace in this utility model;

[0018] Figure 2 This is the circuit diagram of the variable frequency fan in the temperature control system of the industrial heating furnace of this utility model;

[0019] Figure 3 This is a simplified circuit diagram of the temperature control system of an industrial heating furnace in this utility model;

[0020] Figure 4 This is the circuit diagram of the wind speed sensor in the temperature control system of the industrial heating furnace of this utility model. DETAILED DESCRIPTION

[0021] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0022] Reference Figures 1 to 4 , an industrial heating furnace temperature control system, including a temperature sensor, a temperature controller, a power controller, a heating tube, a frequency converter, a PLC, a frequency converter, a wind speed sensor, a motor and an HMI human-machine interface. The temperature sensor is connected to the temperature controller, the temperature controller is also connected to the power controller and the PLC respectively, the power controller is also connected to the heating tube, the PLC is also connected to the wind speed sensor, the frequency converter and the HMI human-machine interface respectively, and the frequency converter is also connected to the motor.

[0023] Temperature sensor: This sensor is used to collect the current ambient temperature in real time. Commonly used temperature sensors in industry include RTDs, thermocouples, and infrared sensors. Each temperature sensor has different accuracy and measurement ranges, and the choice can be based on the specific industrial installation environment and specific needs.

[0024] Heating tubes: Electric current passing through a conductor generates heat, which is used to heat objects or air. They are a common type of electric heating device, widely used in industry and daily life. Heating tubes are made of a variety of materials. Commonly used electric heating tubes in industry are usually made of resistance wire, nickel-chromium alloy, or other high-resistance materials.

[0025] The temperature control unit, consisting of a temperature controller and a power regulator, is the core of the temperature control process. It determines whether the received temperature signal meets the required requirements based on preset temperature and an algorithm. If the temperature falls below the set point, the controller sends a signal to the regulator to activate the heating element. If the temperature reaches or exceeds the set point, the controller shuts off the regulator to prevent overheating. Different temperature controllers vary in price, accuracy, and response speed; choose one based on your specific needs.

[0026] Variable frequency fan: It consists of a frequency converter and an electric motor. The frequency converter changes the power frequency to control the motor speed, so that the output air volume can meet the process requirements under different environments. It has many advantages such as energy saving and high efficiency, flexible control, stable operation, and reduced noise. It is widely used in industrial control, building environment, environmental protection engineering and other fields.

[0027] PLC: Programmable Logic Controller, which can perform data storage, logical operations, program control, communication interaction and other instructions. Compared with traditional industrial control, it has the advantages of fast computing speed, good stability, and easy maintenance. It is widely used in various industrial control fields such as manufacturing, energy, and transportation.

[0028] 2. Thermocouples and heating tubes are installed in the heating furnace cavity. The thermocouple signal is sent to the temperature controller, which determines whether the current temperature reaches the expected setting, thereby controlling the working status of the heating tube. At the same time, the temperature controller sends the current temperature to the PLC, which facilitates the PLC to determine whether the temperature in the furnace cavity is balanced and stable.

[0029] To ensure uniform heating within the furnace cavity, a variable-frequency fan drives hot air through the circulation system. A damper is installed within the cavity to adjust the initial air speed, also meeting the specific temperature control requirements of certain equipment. A wind speed sensor within the cavity transmits a signal to the PLC, enabling it to determine whether the actual air speed within the cavity meets the required requirements.

[0030] In actual industrial furnace production, excessive catalyst / raw materials often cause blockage, leading to larger temperature fluctuations and suboptimal performance. Traditional furnaces are unable to identify the cause and blockage point, making routine maintenance difficult. A wind speed sensor converts ambient wind speed into an electrical signal and sends it to the PLC. The PLC determines the problem and provides timely feedback on the human-machine interface. It also drives the variable frequency fan to increase wind speed to clear the blockage point.

[0031] Here’s how it works:

[0032] The sensor collects signals, converts temperature / wind speed signals into electrical signals and sends them to the control unit. The preset control logic in the control unit makes judgments and controls the heating tube / fan to output, and sends the current data to the HMI screen for real-time display, which is convenient for operators to monitor.

[0033] This design can also be modified based on the traditional heating furnace. The core is to add a variable frequency fan and wind speed sensor unit to the original heating path. Adding a damper can control the initial wind speed. Then, the output of the variable frequency fan is adjusted to control the circulating wind speed in the heating furnace, so that the entire furnace cavity is heated evenly.

[0034] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

[0035] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment have also been appropriately combined to form other implementation methods that are easy for those skilled in the art to understand.

Claims

1. An industrial heating furnace temperature control system, comprising a temperature control unit, a variable frequency fan, a temperature sensor, a power controller, a heating tube, a frequency converter, a PLC, a wind speed sensor, a motor, and an HMI human-machine interface, characterized in that: The temperature control unit is composed of a temperature controller and a power regulator, the variable frequency fan is composed of a frequency converter and an electric motor, the temperature sensor is connected to the temperature controller, the temperature controller is also connected to the power controller and PLC respectively, the power controller is also connected to the heating tube, the PLC is also connected to the wind speed sensor, the frequency converter and the HMI human-machine interface respectively, and the frequency converter is also connected to the electric motor.

2. An industrial heating furnace temperature control system according to claim 1, characterized in that: The temperature sensor is one of a thermal resistor, a thermocouple, and an infrared sensor.

3. The industrial heating furnace temperature control system according to claim 1, characterized in that: The temperature sensor and the heating tube are installed in the heating furnace cavity.

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