Furnace tube high temperature and deformation protection control terminal for heating furnace

Abstract

The utility model discloses a furnace tube high temperature and deformation protection control terminal used for a heating furnace. The terminal comprises a single-chip microcomputer, a first power supply conversion module, a second power supply conversion module, a signal acquisition port and a data communication port. The external DC24V power supply is connected with the signal acquisition port, the external DC24V power supply is connected with the first power supply conversion module, and the first power supply conversion module is connected with the data communication port; the second power supply conversion module is connected with the first power supply conversion module, and the single-chip microcomputer is connected with the second power supply conversion module. The signal acquisition port and the data communication port are respectively connected with the single-chip microcomputer. The control terminal can be used for monitoring the temperature and deformation condition of the furnace tube of the heating furnace in real time.

Description

Technical Field

[0001] The utility model relates to the technical field of heating furnace state monitoring, in particular to a furnace tube high temperature and deformation protection control terminal for a heating furnace. Background Art

[0002] The heating furnace is one of the oilfield special equipment that is widely used in the processing and transportation links of the oil and gas gathering and transportation system. Its function is to heat crude oil, natural gas, oil and gas mixture, etc. to the temperature required by the process to meet the requirements of oil and gas gathering and transportation technology and processing technology. It is a very important oilfield production equipment.

[0003] In recent years, with the continuous increase in oil production and water injection, the heating furnaces in many oil fields are often in an overloaded operation state, resulting in serious scaling of the inner wall of the furnace tube, excessively fast temperature rise and fall and uneven heating, which in turn causes more than 10% of the heating furnace tubes to burn out each year. The subsequent maintenance costs are very high, and it will also seriously delay normal production tasks. In order to avoid this phenomenon, it is necessary to monitor the temperature and deformation of the furnace tubes of the heating furnace in real time. When it is found that the temperature or deformation exceeds the preset range, timely safety interlock protection is carried out to enable the heating furnace to maintain normal operation. However, there is currently no terminal that can be used to realize the real-time monitoring function of the temperature and deformation of the furnace tubes of the heating furnace. Therefore, it is necessary to propose a high temperature and deformation protection control terminal for the furnace tubes of the heating furnace to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to address the deficiencies in the prior art and provide a high temperature and deformation protection control terminal for furnace tubes of a heating furnace, so as to solve the problem that there is currently no terminal that can be used to realize the real-time monitoring function of the temperature and deformation of the furnace tubes of the heating furnace.

[0005] The utility model provides a furnace tube high temperature and deformation protection control terminal for a heating furnace, comprising: a single chip microcomputer, a first power conversion module, a second power conversion module, a signal acquisition port, and a data communication port; an external DC24V power supply is connected to the signal acquisition port to directly power the signal acquisition port; the external DC24V power supply is connected to the first power conversion module, the first power conversion module is connected to the data communication port, and after the external DC24V is acted on by the first power conversion module, a DC5V signal is generated to power the data communication port; the second power conversion module is connected to the first power conversion module, the single chip microcomputer is connected to the second power conversion module, and after the DC5V signal is acted on by the second power conversion module, a DC3.3V signal is generated to power the single chip microcomputer; the signal acquisition port and the data communication port are respectively connected to the single chip microcomputer.

[0006] Further, the first power conversion module includes a power chip U1, a varistor RM1, a diode D1, an inductor L1, an electrolytic capacitor E1, an electrolytic capacitor E2, a filter capacitor C1, a filter capacitor C2, a filter capacitor C3, a filter capacitor C4, and a TVS tube D2; the varistor RM1, the electrolytic capacitor E1, the filter capacitor C1, and the filter capacitor C2 are connected in parallel between the AC pin and the GND pin of the power chip U1, one end of the diode D1 is connected to the ON pin of the power chip U1, and the other end of the diode D1 is connected to one end of the inductor L1, one end of the inductor L1 is connected to the OUT pin of the power chip U1, and the other end of the inductor L1 is connected to the FB pin of the power chip U1, the electrolytic capacitor E2, the filter capacitor C3, the filter capacitor C4, and the TVS tube D2 are connected in parallel, and one end of the electrolytic capacitor E2 is connected to the other end of the inductor L1.

[0007] Furthermore, the second power conversion module includes a power chip U2, a magnetic bead FB1, an electrolytic capacitor E3, a filter capacitor C5, a filter capacitor C6, a filter capacitor C7, and a TVS tube D3; the magnetic bead FB1 is connected to the filter capacitor C5, and the filter capacitor C5 and the filter capacitor C6 are connected in parallel between the IN pin and the GND pin of the power chip U2; the electrolytic capacitor E3, the filter capacitor C7, and the TVS tube D3 are connected in parallel between the OUT pin and the GND pin of the power chip U2.

[0008] Furthermore, the signal acquisition port includes an operational amplifier chip U3, a sampling resistor R1, a current limiting resistor R2, a filter capacitor C8, and a voltage regulator diode D4; the current limiting resistor R2 and the filter capacitor C8 are connected in series and then connected in parallel with the sampling resistor R1 and the voltage regulator diode D4, and the operational amplifier chip U3 is connected between the current limiting resistor R2 and the filter capacitor C8.

[0009] Further, the data communication port includes an RS485 communication circuit, and the RS485 communication circuit includes an RS485 transceiver chip U4, a pull-down resistor R3, a pull-up resistor R4, a matching resistor R5, a current limiting resistor R6, a current limiting resistor R7, a TVS tube D5, and a TVS tube D6; the TVS tube D5 is connected to the current limiting resistor R6, the TVS tube D6 is connected to the current limiting resistor R7, the current limiting resistor R6 and the current limiting resistor R7 are respectively connected to the two ends of the matching resistor R5, the pull-down resistor R3 is connected to the matching resistor R5, and the matching resistor R7 is connected to the TVS tube D5. One end of the resistor R5 is connected to the B pin of the RS485 transceiver chip U4, the other end of the pull-up resistor R4 and the matching resistor R5 are connected to the A pin of the RS485 transceiver chip U4; the R pin of the RS485 transceiver chip U4 is connected to the UART_RX pin of the microcontroller, the RE pin and DE pin of the RS485 transceiver chip U4 are connected to the GPIO pin of the microcontroller, and the D pin of the RS485 transceiver chip U4 is connected to the UART_TX pin of the microcontroller.

[0010] Further, the data communication port includes a CAN communication circuit, which includes a CAN transceiver chip U5, a pull-down resistor R8, a matching resistor R9, a filter capacitor C9, a filter capacitor C10, a resettable fuse PTC1, a resettable fuse PTC2, a TVS tube D7, a TVS tube D8, and a TVS tube D9; one end of the pull-down resistor R8 is connected to the RS pin of the CAN transceiver chip U5, and the other end of the pull-down resistor R8 is connected to the filter capacitor C9, and the filter capacitor C9 is connected to the CANL pin of the CAN transceiver chip U5; the filter The wave capacitor C10 is connected to the CANH pin of the CAN transceiver chip U5; the matching resistor R9 and the TVS tube D7 are connected in parallel between the CANL pin and the CANH pin of the CAN transceiver chip U5; one end of the TVS tube D7 is connected to the resettable fuse PTC1 and the TVS tube D8 in sequence; the other end of the TVS tube D7 is connected to the resettable fuse PTC2 and the TVS tube D9 in sequence; the R pin of the CAN transceiver chip U5 is connected to the CAN0_RX pin of the microcontroller, and the D pin of the CAN transceiver chip U5 is connected to the CAN0_TX pin of the microcontroller.

[0011] The utility model has the following beneficial effects: the overall structure of the high temperature and deformation protection control terminal for the furnace tube of a heating furnace provided by the utility model and the hardware principles of each part can be used to realize timely safety interlocking protection according to the fluctuation of the temperature or deformation of the furnace tube of the heating furnace, so that the heating furnace can maintain normal operation, and can simultaneously monitor the two indicators of the furnace tube and deformation of the heating furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 This is the overall principle block diagram of the furnace tube high temperature and deformation protection control terminal for the heating furnace of the utility model;

[0014] Figure 2 is a hardware schematic diagram of the first power conversion module;

[0015] Figure 3 is a hardware schematic diagram of the second power conversion module;

[0016] Figure 4 It is the hardware schematic diagram of the signal acquisition port;

[0017] Figure 5 It is the hardware schematic diagram of the RS485 communication circuit of the data communication port;

[0018] Figure 6 It is the hardware schematic diagram of the CAN communication circuit of the data communication port. DETAILED DESCRIPTION

[0019] It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the following detailed descriptions are all illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those of ordinary skill in the art to which the present application belongs.

[0020] See also Figures 1 to 6 The utility model provides a furnace tube high temperature and deformation protection control terminal for a heating furnace, comprising: a single chip microcomputer, a first power conversion module, a second power conversion module, a signal acquisition port, and a data communication port. The control terminal uses a medium-performance single chip microcomputer as the main control module, and the single chip microcomputer optional model is: STM32F103VET6.

[0021] An external DC24V power supply is connected to the signal acquisition port to directly power the signal acquisition port; the external DC24V power supply is connected to the first power conversion module, the first power conversion module is connected to the data communication port, and the external DC24V generates a DC5V signal to power the data communication port after being acted on by the first power conversion module; the second power conversion module is connected to the first power conversion module, the single-chip computer is connected to the second power conversion module, and the DC5V signal generates a DC3.3V signal to power the single-chip computer after being acted on by the second power conversion module; the signal acquisition port and the data communication port are respectively connected to the single-chip computer.

[0022] Specifically, the first power conversion module includes a power chip U1, a varistor RM1, a diode D1, an inductor L1, an electrolytic capacitor E1, an electrolytic capacitor E2, a filter capacitor C1, a filter capacitor C2, a filter capacitor C3, a filter capacitor C4, and a TVS tube D2; the power chip U1 can be selected as LM2596S-5. The varistor RM1, the electrolytic capacitor E1, the filter capacitor C1, and the filter capacitor C2 are connected in parallel between the AC pin and the GND pin of the power chip U1, one end of the diode D1 is connected to the ON pin of the power chip U1, the other end of the diode D1 is connected to one end of the inductor L1, one end of the inductor L1 is connected to the OUT pin of the power chip U1, and the other end of the inductor L1 is connected to the FB pin of the power chip U1, the electrolytic capacitor E2, the filter capacitor C3, the filter capacitor C4, and the TVS tube D2 are connected in parallel, and one end of the electrolytic capacitor E2 is connected to the other end of the inductor L1.

[0023] Specifically, the second power conversion module includes a power chip U2, a magnetic bead FB1, an electrolytic capacitor E3, a filter capacitor C5, a filter capacitor C6, a filter capacitor C7, and a TVS tube D3; the power chip U2 can be selected as LM1117-3.3. The magnetic bead FB1 is connected to the filter capacitor C5, and the filter capacitor C5 and the filter capacitor C6 are connected in parallel between the IN pin and the GND pin of the power chip U2; the electrolytic capacitor E3, the filter capacitor C7, and the TVS tube D3 are connected in parallel between the OUT pin and the GND pin of the power chip U2.

[0024] Specifically, the signal acquisition port includes an operational amplifier chip U3, a sampling resistor R1, a current limiting resistor R2, a filter capacitor C8, and a voltage regulator diode D4; the current limiting resistor R2 and the filter capacitor C8 are connected in series and connected in parallel with the sampling resistor R1 and the voltage regulator diode D4, and the operational amplifier chip U3 is connected between the current limiting resistor R2 and the filter capacitor C8.

[0025] The signal acquisition port only has analog signal input. The external analog signal is the 4-20mA current signal sent by the furnace tube temperature and deformation sensor of the heating furnace. The current signal is converted into a voltage signal through the sampling resistor, and then filtered and signal followed by the operational amplifier, and finally input into the ADC acquisition channel of the single-chip microcomputer. The sampling resistor value is: 250Ω±0.1%. The optional model of the operational amplifier chip U3 is: LM358D.

[0026] It should be noted that the signal acquisition port includes a total of 8 analog signal inputs, including 6 temperature signals and 2 deformation signals. The hardware circuit principles of these 8 analog signal inputs are the same. Only one description is given here, and the rest are not repeated.

[0027] Specifically, data communication includes two forms: RS485 and CAN.

[0028] The RS485 communication circuit includes an RS485 transceiver chip U4, a pull-down resistor R3, a pull-up resistor R4, a matching resistor R5, a current limiting resistor R6, a current limiting resistor R7, a TVS tube D5, and a TVS tube D6; the TVS tube D5 is connected to the current limiting resistor R6, the TVS tube D6 is connected to the current limiting resistor R7, the current limiting resistor R6 and the current limiting resistor R7 are respectively connected to the two ends of the matching resistor R5, the pull-down resistor R3 is connected to one end of the matching resistor R5 and is connected to the B pin of the RS485 transceiver chip U4, the pull-up resistor R4 is connected to the other end of the matching resistor R5 and is connected to the A pin of the RS485 transceiver chip U4; the R pin of the RS485 transceiver chip U4 is connected to the UART_RX pin of the microcontroller, the RE pin and the DE pin of the RS485 transceiver chip U4 are connected to the GPIO pin of the microcontroller, and the D pin of the RS485 transceiver chip U4 is connected to the UART_TX pin of the microcontroller.

[0029] The RS485 transceiver chip model is: I SO3088DWR. The typical value of matching resistor R5 is: 120Ω. In the RS485 communication circuit, the UART1 and GPIO interface of the microcontroller are connected to the RS485 transceiver chip, which completes the electrical protocol matching and then connects to the EMC protection circuit composed of TVS, resistors, etc.

[0030] The CAN communication circuit includes a CAN transceiver chip U5, a pull-down resistor R8, a matching resistor R9, a filter capacitor C9, a filter capacitor C10, a resettable fuse PTC1, a resettable fuse PTC2, a TVS tube D7, a TVS tube D8, and a TVS tube D9; one end of the pull-down resistor R8 is connected to the RS pin of the CAN transceiver chip U5, and the other end of the pull-down resistor R8 is connected to the filter capacitor C9, and the filter capacitor C9 is connected to the CANL pin of the CAN transceiver chip U5; the filter capacitor C10 is connected to the CAN receiver The matching resistor R9 and TVS tube D7 are connected in parallel between the CANL pin and the CANH pin of the CAN transceiver chip U5; one end of the TVS tube D7 is connected to the resettable fuse PTC1 and the TVS tube D8 in sequence; the other end of the TVS tube D7 is connected to the resettable fuse PTC2 and the TVS tube D9 in sequence; the R pin of the CAN transceiver chip U5 is connected to the CAN0_RX pin of the microcontroller, and the D pin of the CAN transceiver chip U5 is connected to the CAN0_TX pin of the microcontroller.

[0031] The optional model of CAN transceiver chip is: SN65HVD230DR. The typical value of matching resistor R9 is: 120Ω. In the CAN communication circuit, the CAN0 interface of the microcontroller is connected to the CAN transceiver chip, which completes the electrical protocol matching and then connects to the EMC protection circuit composed of TVS, resistors, capacitors, etc.

[0032] In summary, the overall structure and hardware principles of the high temperature and deformation protection control terminal for the furnace tubes of a heating furnace provided by the utility model can be used to implement timely safety interlocking protection according to the fluctuation of the temperature or deformation of the furnace tubes of the heating furnace, so that the heating furnace can maintain normal operation, and can simultaneously monitor the two indicators of the furnace tubes and deformation of the heating furnace.

[0033] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example.

[0035] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A furnace tube high temperature and deformation protection control terminal for a heating furnace, characterized in that: include: Single chip microcomputer, first power conversion module, second power conversion module, signal acquisition port, data communication port; An external DC24V power supply is connected to the signal acquisition port to directly power the signal acquisition port; the external DC24V power supply is connected to the first power conversion module, the first power conversion module is connected to the data communication port, and the external DC24V generates a DC5V signal to power the data communication port after being acted on by the first power conversion module; the second power conversion module is connected to the first power conversion module, and the single-chip computer is connected to the second power conversion module, and the DC5V signal generates a DC3.3V signal to power the single-chip computer after being acted on by the second power conversion module; the signal acquisition port and the data communication port are respectively connected to the single-chip computer.

2. A furnace tube high temperature and deformation protection control terminal for a heating furnace as claimed in claim 1, characterized in that: The first power conversion module includes a power chip U1, a varistor RM1, a diode D1, an inductor L1, an electrolytic capacitor E1, an electrolytic capacitor E2, a filter capacitor C1, a filter capacitor C2, a filter capacitor C3, a filter capacitor C4, and a TVS tube D2; The varistor RM1, the electrolytic capacitor E1, the filter capacitor C1, and the filter capacitor C2 are connected in parallel between the AC pin and the GND pin of the power chip U1, one end of the diode D1 is connected to the ON pin of the power chip U1, the other end of the diode D1 is connected to one end of the inductor L1, one end of the inductor L1 is connected to the OUT pin of the power chip U1, and the other end of the inductor L1 is connected to the FB pin of the power chip U1, the electrolytic capacitor E2, the filter capacitor C3, the filter capacitor C4, and the TVS tube D2 are connected in parallel, and one end of the electrolytic capacitor E2 is connected to the other end of the inductor L1.

3. A furnace tube high temperature and deformation protection control terminal for a heating furnace as claimed in claim 1, characterized in that: The second power conversion module includes a power chip U2, a magnetic bead FB1, an electrolytic capacitor E3, a filter capacitor C5, a filter capacitor C6, a filter capacitor C7, and a TVS tube D3; The magnetic bead FB1 is connected to the filter capacitor C5. The filter capacitors C5 and C6 are connected in parallel between the IN pin and the GND pin of the power chip U2. The electrolytic capacitor E3, the filter capacitor C7, and the TVS tube D3 are connected in parallel between the OUT pin and the GND pin of the power chip U2.

4. A furnace tube high temperature and deformation protection control terminal for a heating furnace as claimed in claim 1, characterized in that: The signal acquisition port includes an operational amplifier chip U3, a sampling resistor R1, a current limiting resistor R2, a filter capacitor C8, and a voltage regulator diode D4; The current limiting resistor R2 and the filter capacitor C8 are connected in series and then connected in parallel with the sampling resistor R1 and the voltage stabilizing diode D4. The operational amplifier chip U3 is connected between the current limiting resistor R2 and the filter capacitor C8.

5. A furnace tube high temperature and deformation protection control terminal for a heating furnace as claimed in claim 1, characterized in that: The data communication port includes an RS485 communication circuit, and the RS485 communication circuit includes an RS485 transceiver chip U4, a pull-down resistor R3, a pull-up resistor R4, a matching resistor R5, a current limiting resistor R6, a current limiting resistor R7, a TVS tube D5, and a TVS tube D6; The TVS tube D5 is connected to the current limiting resistor R6, and the TVS tube D6 is connected to the current limiting resistor R7. The current limiting resistor R6 and the current limiting resistor R7 are respectively connected to the two ends of the matching resistor R5, the pull-down resistor R3 is connected to one end of the matching resistor R5 and connected to the B pin of the RS485 transceiver chip U4, and the pull-up resistor R4 is connected to the other end of the matching resistor R5 and connected to the A pin of the RS485 transceiver chip U4; the R pin of the RS485 transceiver chip U4 is connected to the UART_RX pin of the microcontroller, the RE pin and the DE pin of the RS485 transceiver chip U4 are connected to the GPIO pin of the microcontroller, and the D pin of the RS485 transceiver chip U4 is connected to the UART_TX pin of the microcontroller.

6. A furnace tube high temperature and deformation protection control terminal for a heating furnace as claimed in claim 1, characterized in that: The data communication port includes a CAN communication circuit, and the CAN communication circuit includes a CAN transceiver chip U5, a pull-down resistor R8, a matching resistor R9, a filter capacitor C9, a filter capacitor C10, a resettable fuse PTC1, a resettable fuse PTC2, a TVS tube D7, a TVS tube D8, and a TVS tube D9; One end of the pull-down resistor R8 is connected to the RS pin of the CAN transceiver chip U5, and the other end of the pull-down resistor R8 is connected to the filter capacitor C9, and the filter capacitor C9 is connected to the CANL pin of the CAN transceiver chip U5; the filter capacitor C10 is connected to the CANH pin of the CAN transceiver chip U5; the matching resistor R9 and the TVS tube D7 are connected in parallel between the CANL pin and the CANH pin of the CAN transceiver chip U5; one end of the TVS tube D7 is connected to the resettable fuse PTC1 and the TVS tube D8 in sequence; the other end of the TVS tube D7 is connected to the resettable fuse PTC2 and the TVS tube D9 in sequence; the R pin of the CAN transceiver chip U5 is connected to the CAN0_RX pin of the microcontroller, and the D pin of the CAN transceiver chip U5 is connected to the CAN0_TX pin of the microcontroller.

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