Chemical heating furnace flame detection monitoring and interlocking shutdown protection system

Abstract

This utility model relates to a flame detection, monitoring, and interlocking shutdown protection system for a chemical heating furnace, belonging to the field of heating furnace technology. It solves the problems of complexity and low accuracy in existing heating furnace flame combustion status detection systems. The technical solution includes a heating furnace with several burners and several pre-drilled holes. Flame detection devices are installed at the pre-drilled holes. The flame detection devices are electrically connected to the input of a first controller. The output of the first controller uploads the flame intensity signal to a signal comparison module on a server. The signal input of the signal comparison module is electrically connected to the output of a first process detection device. The first process detection device transmits the process detection parameters detected by the first process detection device to the signal comparison module. The output of the signal comparison module is electrically connected to the signal input of a data processing module on the server. The output of the data processing module is electrically connected to a gas supply valve switch module. This utility model is applied to heating furnaces.

Description

Technical Field

[0001] This utility model provides a flame detection and monitoring system and an interlocking shutdown protection system for a chemical heating furnace, belonging to the field of heating furnace technology. Background Technology

[0002] In chemical reactions in petrochemical, coal chemical, and fine chemical industries, high heating temperatures are often required. Currently, heating furnaces are commonly used in the industry as key process equipment to raise the temperature of materials to the required chemical reaction temperature. This equipment has advantages such as being economical and easy to operate and control, but compared with high-temperature, high-pressure steam heating methods, it poses higher safety risks. Specifically, when some burners in the heating furnace suddenly experience combustion interruption, fuel gas will accumulate inside the furnace. Once the concentration of the fuel gas reaches its explosive limit, it may ignite and explode, leading to a safety accident.

[0003] Based on this, Chinese invention patent (CN117455826A) proposes a method and system for detecting the flame combustion state of a heating furnace. This method obtains the flame combustion area within the furnace by acquiring environmental parameters. However, the combustion state at this point may contain some errors. Therefore, it is necessary to correct the flame combustion area to determine the final flame combustion area, and then determine the flame combustion state based on the corrected flame combustion area. The aforementioned detection system is complex, its detection method is cumbersome, and its detection accuracy is relatively low. Utility Model Content

[0004] To address the technical problems of complex and low detection accuracy in existing furnace flame combustion status detection systems, this invention proposes a chemical furnace flame detection, monitoring, and interlocking shutdown protection system. The aim is to optimize the furnace flame combustion status detection system and improve its detection accuracy by improving the hardware and / or circuit structure.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a flame detection monitoring and interlocking shutdown protection system for a chemical heating furnace, including a heating furnace, wherein the heating furnace is provided with a plurality of burners and a plurality of reserved holes, the reserved holes corresponding one-to-one with the burners, and a flame detection device is provided at each reserved hole. The flame detection device is electrically connected to the signal input terminal of a first controller after passing through a signal amplification circuit module, a first relay and a DI input card in sequence. The signal output terminal of the first controller is electrically connected to the signal input terminal of the signal comparison module of the server. The signal output terminal of the first controller uploads the flame intensity value signal detected by the flame detection device to the signal comparison module of the server.

[0006] The output of the signal comparison module is electrically connected to the signal input of the data processing module. The signal output of the data processing module is electrically connected to the second controller and the switch. The second controller is also electrically connected in sequence to the DO output card, the second relay and the gas supply valve switch module. The gas supply valve switch module is connected to the burner signal input. The switch is also electrically connected in sequence to the DCS monitoring module and the fault handling module.

[0007] The signal input terminal of the signal comparison module is also electrically connected to the output terminal of at least one first process detection device. Further, the data processing module includes several first voters and several second voters. The signal input terminal of the first voter is electrically connected to the output terminal of the signal comparison module, and the output terminal of the first voter is electrically connected to the alarm device of the fault handling module.

[0008] The signal input terminal of the second voter is electrically connected to the output terminal of the signal comparison module, and the output terminal of the second voter is connected to the signal input terminal of the second controller.

[0009] Furthermore, the first voting device is an N-selection voting device, and the second voting device is an n-selection M voting device; where 3≤M<n≤N, and N, n, and M are integers.

[0010] Furthermore, the data processing module includes two first voting units, each of which has fifteen signal input terminals electrically connected to the fifteen output terminals of the signal comparison module, and the output terminals of both first voting units are electrically connected to an alarm device.

[0011] Furthermore, the data processing module includes two second voting units, each of which has fifteen signal input terminals electrically connected to the fifteen output terminals of the signal comparison module, and the output terminals of both second voting units are electrically connected to the input terminals of the second controller.

[0012] Furthermore, the flame detection device is model IFD-UV-001.

[0013] Furthermore, both the first controller and the second controller are PLC controllers.

[0014] The advantages of this utility model over the prior art are as follows:

[0015] 1. The flame detection device of this utility model works in conjunction with the signal amplification circuit module, server, DCS monitoring module, fault handling module and their circuit connection components to improve the detection accuracy of the flame combustion status of the heating furnace compared with the traditional heating furnace flame combustion status detection system, and the system is simpler.

[0016] 2. By setting up a first voting device and a second voting device, this utility model maintains stable operation while taking into account safety considerations.

[0017] 3. This utility model enables the installation of a flame detection and monitoring system and an interlocking shutdown protection system for the heating furnace by fixing a flame detection device to a pre-drilled hole on the heating furnace. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings:

[0019] Figure 1 This is the control logic diagram of this utility model;

[0020] Figure 2 This utility model relates to a 15-out-of-15 voting device, a 15-out-of-12 voting device, and their connecting circuits. Figure 1 ;

[0021] Figure 3 This utility model includes a first voting device, a second voting device, and their connecting circuits. Figure 2 ;

[0022] Figure 4 The circuit diagrams of the three-out-of-two low-interlock logic module, the three-out-of-two high-interlock logic module, and their connection relationships are shown in this utility model.

[0023] Figure 5 This utility model provides a three-out-of-one voting device, a three-out-of-two voting device, and their connection circuit diagrams.

[0024] Figure 6 This utility model relates to a three-out-of-two high-interlocking logic module and its connection circuit. Figure 1 ;

[0025] Figure 7 The circuit diagrams of the three-out-of-two low-interlock logic module, the three-out-of-two high-interlock logic module, and their connection relationships are shown in this utility model.

[0026] Figure 8 This utility model provides a four-out-of-one voting device, a four-out-of-three voting device, and their connection circuit diagrams.

[0027] Figure 9 This utility model relates to a three-out-of-two high-interlocking logic module and its connection circuit. Figure 2 ;

[0028] Figure 10 This is a circuit diagram of the three-out-of-two high-interlock logic module, the three-out-of-two voting device, and their connection relationships according to this utility model.

[0029] Figure 11 This is a layout diagram of the combustion furnace and heating furnace of this utility model.

[0030] In the diagram: 1 is a 12-core cable, 2 is an integrated flame detector, 3 is a heat-insulating joint, 4 is a viewing window assembly, 5 is the first pair of wires, 6 is a three-way valve, 7 is the second pair of wires, 8 is a universal joint, 9 is a heating furnace, and 10 is a burner. Detailed Implementation

[0031] In this utility model, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not used to limit this utility model.

[0032] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] like Figures 1 to 11 As shown, this utility model provides a flame detection monitoring and interlocking shutdown protection system for a chemical heating furnace, including a heating furnace 9. Several burners 10 are fixedly connected to the heating furnace 9. Several reserved holes are opened on the heating furnace 9, and each reserved hole corresponds to one of the burners 10. A flame detection device is fixedly connected to each reserved hole. The flame detection device is electrically connected to the signal input terminal of the first controller after passing through a signal amplification circuit module, a first relay and a DI input card. The signal output terminal of the first controller is electrically connected to the signal input terminal of the signal comparison module of the server. The signal output terminal of the first controller uploads the flame intensity value signal of the burner 10 detected by the flame detection device to the signal comparison module of the server.

[0034] The output of the signal comparison module is electrically connected to the signal input of the data processing module. The signal output of the data processing module is electrically connected to the second controller and the switch. The second controller is also electrically connected in sequence to the DO output card, the second relay and the gas supply valve switch module. The gas supply valve switch module is connected to the signal input of the burner 10. The switch is also electrically connected in sequence to the DCS monitoring module and the fault handling module.

[0035] The signal input terminal of the signal amplification circuit module is also electrically connected to the output terminal of at least one first process detection device, which transmits the process detection parameters detected by the first process detection device to the signal comparison module.

[0036] The signal comparison module has preset values ​​for flame intensity and at least one set of preset values ​​for process detection. After the signal comparison module outputs a signal that the flame intensity signal value emitted by the burner 10 exceeds the preset value and a signal that the process detection parameter exceeds the preset value for process detection, it transmits the signal to the signal input terminal of the data processing module of the server.

[0037] The output of the signal comparison module transmits the signals of flame intensity exceeding the preset value and process detection parameters exceeding the preset process detection value to the display module of the DCS monitoring module via the switch. At the same time, the DCS monitoring module transmits the signals of flame intensity exceeding the preset value and process detection parameters exceeding the preset process detection value to the fault handling module for early warning, prompting the staff to carry out maintenance.

[0038] The data processing module includes multiple first voters and multiple second voters. The signal input terminals of the first voters are electrically connected to the output terminals of the signal comparison module, and the output terminals of the first voters are electrically connected to the alarm device of the fault handling module. The signal input terminals of the second voters are electrically connected to the output terminals of the signal comparison module, and the output terminals of the second voters are connected to the signal input terminals of the second controller.

[0039] The first voting device is an N-choose-1 voting device (N is an integer), meaning that when one flame intensity signal value at the signal input terminal of the first voting device exceeds a preset value, the alarm device is triggered. The second voting device is an n-choose-M voting device (2≤M<3≤n≤N, where M and n are both integers), meaning that when M flame intensity signal values ​​at the signal input terminal of the second voting device exceed preset values ​​and / or process detection parameters exceed preset process detection values, a control signal is output to the second controller.

[0040] Specifically, each heating furnace 9 is equipped with N burners 10 and has N reserved holes. Each reserved hole is connected to a flame detection device via a flange. The flame detection device corresponds to the nozzle of the burner 10 and can detect the state of the flame generated by the burner 10 in real time.

[0041] In use, if N≥3, N flame detection devices are electrically connected to the signal amplification circuit module, thereby uploading N flame intensity signal values ​​exceeding the preset value to the signal comparison module. That is, the signal input terminal of the signal comparison module receives the flame intensity value signals emitted by the burner 10 detected by the N flame detection devices, and the output terminal of the signal comparison module outputs M (N≥M>L, where L is the number of burners 10 whose flame intensity signal values ​​exceed the preset value, determined by the designer or owner based on the total number of burners 10 in the heating furnace 9 while taking into account safety and stable equipment operation. In this embodiment, L is 12) flame intensity signal values ​​exceeding the preset value. When these M flame intensity signal values ​​exceed the preset value, the output terminal of the signal comparison module outputs M flame intensity signal values ​​exceeding the preset value to the signal input terminal of the second voter. The output terminal of the second voter outputs a control signal to the second controller. The second controller controls the gas supply valve switch module through the second relay, thereby closing the gas supply valve of the burner 10. The burner 10 stops burning, thus preventing the fuel from being cut off due to the burner 10 stopping burning, which could lead to an explosion due to fuel accumulation inside the furnace of the heating furnace 9.

[0042] In this embodiment, each heating furnace 9 is equipped with thirty burners 10 and has thirty pre-drilled holes. Each pre-drilled hole is connected to a flame detection device via a flange, which can detect the flame status generated by the burner 10 in real time. The signal comparison module includes two data comparators, and the fifteen signal input terminals of each data comparator are respectively connected to the output terminals of the fifteen flame detection devices.

[0043] When the number of fuel burners N < 3 in the heating furnace 9, m (1 ≤ m < N, m is an integer) flame detection devices and Nm first process detection devices are electrically connected to the signal amplification circuit module, thereby uploading m flame intensity signal values ​​exceeding preset values ​​and Nm process detection parameter exceeding process detection preset values ​​to the signal comparison module. That is, the signal input terminal of the signal comparison module inputs the flame intensity value signals emitted by the burner 10 detected by N flame detection devices and 3-N process detection parameter signals. The output terminal of the signal comparison module outputs k (1 ≤ k ≤ N, k is an integer) flame intensity signal values ​​exceeding preset values ​​and 2-k process detection parameter exceeding process detection preset values ​​to the signal input terminal of the second voter. The output terminal of the second voter outputs a control signal to the second controller. The second controller controls the gas supply valve switching module through the second relay, thereby closing the gas supply valve of the burner 10.

[0044] More specifically, the data processing module includes two first voting units and two second voting units. The first voting units are either a 1 / 15 voting unit, a 1 / 3 voting unit, or a 1 / 4 voting unit, and the second voting units are either a 1 / 15 voting unit, a 2 / 3 voting unit, or a 3 / 4 voting unit.

[0045] Taking a heating furnace 9 with thirty burners 10 fixedly connected as an example, two first voting devices and two second voting devices are used. The first voting device is a 1 / 15 voting device, and the second voting device is a 1 / 15 voting device. The control logic of the data processing module in this embodiment is explained in detail.

[0046] Specifically, the fifteen signal input terminals of each first voting unit are electrically connected to the fifteen output terminals of the signal comparison module, and the signal that the flame intensity signal value exceeds the preset value is output to the first voting unit. The output terminal of the first voting unit is electrically connected to the alarm device, and when one of the flame intensity signal values ​​exceeds the preset value, an alarm signal is issued.

[0047] The fifteen signal input terminals of each second voter are electrically connected to the fifteen output terminals of the signal comparison module. The signal that the flame intensity signal value exceeds the preset value is output to the second voter. The output terminals of the two second voters are electrically connected to the input terminals of three OR gates, and the output terminals of the three OR gates are electrically connected to the input terminals of the second controller.

[0048] The three OR gates are designated as the first OR gate, the second OR gate, and the third OR gate. The input of the first OR gate is also electrically connected to the outputs of the fourth OR gate and the seventh OR gate. The input of the fourth OR gate is electrically connected to the outputs of the fifth OR gate and the sixth OR gate. The input of the seventh OR gate is electrically connected to the output of the pressure gauge of the burner 10 and the output of the bubble level gauge of the heater 9. The input of the fifth OR gate is electrically connected to the output of the fuel gas pressure detection device of the heater 9's continuous light and the output of the heater 9's shutdown button. The input of the second OR gate is also electrically connected to the outputs of the fourth OR gate, the seventh OR gate, and the third AND gate. The input of the third OR gate is also electrically connected to the outputs of the fifth OR gate, the first AND gate, the second AND gate, and the output of the three-out-of-two high-order interlocking logic module. The input of the first AND gate is electrically connected to the output of the 3-out-of-2 low-interlock logic module and the output of the third AND gate; the input of the second AND gate is electrically connected to the output of the 3-out-of-2 low-interlock logic module and the output of the bypass button for start-up of the heater 9; the input of the third AND gate is electrically connected to the output of the bypass button for start-up of the heater 9. The input of the 3-out-of-2 high-interlock logic module is electrically connected to the output of three feed temperature detectors, and the input of the 3-out-of-2 low-interlock logic module is electrically connected to the output of three mixed hydrogen flow detectors.

[0049] The range of the 3-out-of-2 high-temperature interlocking logic module is 0-500℃, and the set value is 399℃. After receiving the detection signals output by the three feed temperature detectors, the input terminal of the 3-out-of-2 high-temperature interlocking logic module performs a 3-out-of-2 filtering to remove random interference and abnormal jump values, and selects the middle value as the valid input. Based on the pre-processed valid signal, the 3-out-of-2 high-temperature interlocking logic module performs a 3-out-of-2 voting logic process. When the detection signals output by at least two feed temperature detectors exceed the set value of the 3-out-of-2 high-temperature interlocking logic module, a low level is output.

[0050] The three-out-of-two low-interlock logic module has a range of 0-49000 Nm³ / h and a setpoint of 19579 Nm³ / h. After receiving the detection signals from three mixed-hydrogen flow meters, the module performs a three-out-of-two filtering to eliminate random interference and abnormal fluctuations, selecting the median value as the valid input to ensure basic signal reliability. Based on the pre-processed valid signal, the module performs a three-out-of-two voting logic. When the detection signals from at least two mixed-hydrogen flow meters are lower than the module's setpoint, it outputs a low level.

[0051] The three-out-of-two high-interlock logic module and the three-out-of-two low-interlock logic module are logic control modules commonly used by those skilled in the art, and will not be described in detail here.

[0052] Taking a burner 10 fixedly connected in the heating furnace 9 as an example, the second voting device adopts a three-out-of-two voting device. The three input terminals of the second voting device are electrically connected to the three output terminals of the signal comparison module. The signal comparison module receives the flame intensity value signal emitted by the burner 10 detected by a flame detection device and the process detection parameter signals detected by two first process detection devices. One output terminal of the signal comparator outputs a flame intensity signal value exceeding a preset value, and the other two output terminals output process detection parameters exceeding process detection preset values. In this embodiment, the first process detection device is a flue gas temperature detector in the radiant section of the heating furnace 9.

[0053] If the flame intensity signal value output by the signal comparator exceeds the preset value, the output terminal of the signal can be electrically connected to the alarm device via the first voter or directly to the alarm device to issue an alarm signal.

[0054] The output of the second voting device is electrically connected to the inputs of the first NOR gate and the second NOR gate. The input of the first NOR gate is also electrically connected to the outputs of the two fuel gas pressure detectors for the continuous lighting of the heating furnace 9 and the two-out-of-three high-pressure interlocking module 2. The input of the second NOR gate is also electrically connected to the outputs of the eighth OR gate and the ninth OR gate. The inputs of the second NOR gate and the first NOR gate are connected in parallel and then connected to the field button. The outputs of both the first and second NOR gates are electrically connected to the inputs of the second controller. The two inputs of the eighth OR gate are electrically connected to the outputs of the two-out-of-three high-pressure interlocking module 2 and the integrated operational amplifier, respectively. The input of the two-out-of-three high-pressure interlocking module 2 is electrically connected to the outputs of three outlet temperature detectors for the heating furnace 9. The input of the integrated operational amplifier is electrically connected to the outputs of the emergency circulation line flow detector and the bottom oil flow detector of the light pressure reducing tower for the heating furnace 9.

[0055] The first process detection device is a process detection device that is not directly related to the state of the burner 10 during the operation of the heating furnace 9. In this embodiment, the first process detection device is one or both of the following: a radiant chamber temperature detection device and a convection temperature detection device.

[0056] The flame detection device is model IFD-UV-001. It includes an integrated flame detector 2. One end of the integrated flame detector 2 is electrically connected to the signal circuit amplification module via a 12-core cable 1. The other end of the integrated flame detector 2 is sequentially connected to a universal joint 8 via a heat insulation connector 3, a viewing window assembly 4, a first pair of wires 5, a three-way valve 6, and a second pair of wires 7. The universal joint 8 is fixedly connected to a pre-drilled hole via a flange gauge. The pre-drilled hole is either an ignition hole or a viewing hole.

[0057] Both the first and second controllers are PLC controllers.

[0058] There are no restrictions on the number and model of the first and second voting units, as long as the total number of their signal input terminals is not less than the number of flame detection devices used to detect the intensity of the flame generated by the burner 10.

[0059] The working principle of this utility model is as follows:

[0060] In use, the flame detection device transmits the flame intensity signal detected by the burner 10 and / or the process detection parameter signal detected by the first process detection device through the signal amplification circuit module, the first relay, and the DI input card to the signal input terminal of the first controller. The signal output terminal of the first controller uploads the flame intensity signal detected by the flame detection device to the signal comparison module of the server. The signal comparison module outputs a signal indicating that the flame intensity signal value of the burner 10 exceeds a preset value and / or a signal indicating that the process detection parameter exceeds a preset value, and then transmits this signal to the data processing module of the server. When one or more flame detection devices... When the flame intensity signal value output by the measuring device exceeds the preset value, an alarm signal is issued. When the number of burners 10 whose flame intensity signal value exceeds the preset value reaches the number determined by the designer or owner based on the total number of burners 10 in the heating furnace 9 while taking into account safety and stable equipment operation, or when the number of burners 10 whose flame intensity signal value exceeds the preset value and the number of process detection parameters whose process detection preset value exceeds the preset value exceeds the preset value, the second controller controls the gas supply valve switch module to close the gas supply valve of the burner 10. At the same time, the flame intensity signal value exceeding the preset value and the process detection parameters exceeding the process detection preset value are uploaded to the display module of the DCS monitoring module through the switch for display.

[0061] Regarding the specific structure of this utility model, it should be noted that the connection relationships between the various component modules adopted in this utility model are definite and achievable. Except as specifically described in the embodiments, their specific connection relationships can bring about corresponding technical effects and solve the technical problems proposed by this utility model without relying on the execution of corresponding software programs. The models of the components, modules, and specific components appearing in this utility model, the connection methods between them, and the conventional usage methods and expected technical effects brought about by the above-mentioned technical features, unless specifically described, are all publicly disclosed content in patents, journal articles, technical manuals, technical dictionaries, and textbooks that can be obtained by those skilled in the art before the application date, or belong to conventional technology, common knowledge, and other existing technologies in this field. There is no need to elaborate, which makes the technical solution provided in this case clear, complete, and achievable, and can reproduce or obtain corresponding physical products based on this technical means.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A chemical heating furnace flame detection monitoring and interlocked shutdown protection system, comprising a heating furnace (9), a plurality of burners (10) and a plurality of reserved holes are arranged on the heating furnace (9), and the reserved holes correspond to the burners (10) one by one, characterized in that, Each reserved hole is equipped with a flame detection device. The flame detection device is connected to the signal input terminal of the first controller in sequence through the signal amplification circuit module, the first relay and the DI input card. The signal output terminal of the first controller is connected to the signal input terminal of the signal comparison module of the server. The signal output terminal of the first controller uploads the flame intensity value signal detected by the flame detection device to the signal comparison module of the server. The output of the signal comparison module is electrically connected to the signal input of the data processing module. The signal output of the data processing module is electrically connected to the second controller and the switch. The second controller is also electrically connected to the DO output card, the second relay and the gas supply valve switch module in sequence. The gas supply valve switch module is connected to the signal input of the burner (10). The switch is also electrically connected to the DCS monitoring module and the fault handling module in sequence. The signal input terminal of the signal comparison module is also electrically connected to the output terminal of at least one first process detection device, which transmits the process detection parameters detected by the first process detection device to the signal comparison module.

2. The chemical process heating furnace flame detection monitoring and interlocked shutdown protection system according to claim 1, wherein, The data processing module includes several first voting units and several second voting units. The signal input terminal of the first voting unit is electrically connected to the output terminal of the signal comparison module, and the output terminal of the first voting unit is electrically connected to the alarm device of the fault processing module. The signal input terminal of the second voter is electrically connected to the output terminal of the signal comparison module, and the output terminal of the second voter is connected to the signal input terminal of the second controller.

3. The chemical process heating furnace flame detection monitoring and interlocked shutdown protection system according to claim 2, wherein, The first voting device is an N-selection voting device, and the second voting device is an n-selection M voting device; where 3≤M<n≤N, and N, n, and M are integers.

4. The chemical process heating furnace flame detection monitoring and interlocked shutdown protection system, according to claim 2, wherein, The data processing module includes two first voting units. The fifteen signal input terminals of each first voting unit are electrically connected to the fifteen output terminals of the signal comparison module, and the output terminals of both first voting units are electrically connected to the alarm device.

5. The flame detection, monitoring, and interlocking shutdown protection system for a chemical heating furnace according to claim 1, characterized in that, The data processing module includes two second voting units. The fifteen signal input terminals of each second voting unit are electrically connected to the fifteen output terminals of the signal comparison module, and the output terminals of both second voting units are electrically connected to the input terminals of the second controller.

6. The flame detection, monitoring, and interlocking shutdown protection system for a chemical heating furnace according to claim 1, characterized in that, The flame detection device is model IFD-UV-001.

7. The flame detection, monitoring, and interlocking shutdown protection system for a chemical heating furnace according to claim 1, characterized in that, Both the first controller and the second controller are PLC controllers.

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