Intelligent temperature control system for zirconia oxygen analyzer

Abstract

The invention belongs to the technical field of industrial production temperature control, particularly relates to an intelligent temperature control system for a zirconium oxide oxygen analyzer, and belongs to the technical field of industrial production temperature control. The intelligent temperature control system highly integrates a zirconium oxide oxygen analyzer body, a temperature detection module, a zirconium potential acquisition circuit, a phase detection circuit, a heating control circuit, a display device and the like. For an intelligent temperature control system, the requirements for accurate temperature detection, accurate temperature control, rapid system heating and controllable output power are high. A fuzzy PID algorithm, a Kalman filtering algorithm, a compensation algorithm and the like are used in software, cold end compensation, phase detection, heating control and the like are adopted in hardware, and accuracy, safety, real-time performance and expansibility of the system are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of industrial production temperature control, and in particular to an intelligent temperature control system for a zirconium oxide oxygen analyzer. Background Art

[0002] Zirconia analyzers are mainly used in inert gas reactors, purification of argon or nitrogen, combustion control of boilers or incinerators, filling and canning of gas cylinders in gas plants, shipboard inert gas generators, carbon dioxide purity detection in the beer industry, heat treatment industrial furnaces, etc. Strong temperature control technical support is required. The system is used in the field of industrial production and needs to solve many factors such as a wide variety of heating objects, high requirements for temperature control, and heating rate to ensure stable and reliable operation in different systems. This is the difficulty currently faced in the field of technology.

[0003] There are still some disadvantages in the existing technology:

[0004] 1. Heating control technology: Currently, for the intelligent temperature control system of zirconia oxygen analyzer, most of them adopt zero-crossing trigger electricity and switch-type heating methods, which leads to long heating cycle, low temperature accuracy, and oscillation of the expected heating temperature.

[0005] 2. The applicable system is too single: Zirconia oxygen analyzer involves the field of industrial production. There are many types of heating systems. Different temperature control systems require different heating controls, and there are high requirements for the versatility of the intelligent temperature control system.

[0006] 3. The control algorithm of the software is simple and not in-depth enough: The intelligent temperature control system of the zirconium oxide oxygen analyzer needs to accurately control the temperature to eliminate system errors.

[0007] 4. Lack of compensation for system errors: There are errors in the overall system, which come from many aspects such as cold end potential, oxygen content, etc. If the errors are not corrected or compensated, the stability, reliability and safety of the system will be greatly reduced. Summary of the invention

[0008] The present invention aims to solve the above technical problems and provides an intelligent temperature control system for a zirconium oxide oxygen analyzer.

[0009] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0010] An intelligent temperature control system for a zirconium oxide oxygen analyzer, comprising

[0011] Zirconia oxygen analyzer body, used for integrating the shell body of the assembled parts;

[0012] Temperature detection module, used for real-time detection and feedback of heating status, and collection of the temperature of the heating object;

[0013] When the zirconium potential acquisition circuit is used for thermocouple acquisition, the change of cold end temperature will affect the acquisition temperature. The bridge compensation method is added to correct the system temperature, and the electromotive force generated by the unbalanced bridge is used to compensate for the change of thermoelectric potential caused by the change of the cold end temperature of the thermocouple.

[0014] The phase detection circuit uses a phase-triggered heating method to set the conduction angle of the thyristor, which can control the conduction frequency of the heating, making the system respond faster and the temperature control more accurate;

[0015] Heating control circuit; used to control the heating of the heating object, control the temperature of the heating object in real time, and realize automatic adjustment by controlling the heating coefficient;

[0016] Display device: a display screen for displaying local potential, system temperature, time, and the system parameters can be changed through the menu.

[0017] Preferably, the heating control circuit includes a heating cutout, a heating object, a heating control port, a photocoupler U1, a photocoupler U2 and a P-MOS.

[0018] Preferably, pin 1 of the photocoupler U1 is connected to 3V3 through a series resistor R3, pin 1 of the photocoupler U2 is connected to 3V3 through a series resistor R5, the heating incision is connected to pin 2 of the photocoupler U1, pin 4 of the photocoupler U1 is connected to resistor R2, the other end of the resistor R2 is respectively connected to the resistor R1 and the G pole of the P-MOS, the other end of the resistor R1 is combined with the S pole of the P-MOS to connect to VCC, the D pole of the P-MOS is respectively connected to the resistor R4, the diode D2 and the relay Relay1, the other end of the resistor R4 is connected to the indicator light LED0, the other end of the indicator light LED0, the 3rd pin of the photocoupler U1, the other end of the diode D2 and One end of the relay Relay1 is grounded, the heating control port is connected to pin 2 of the photoelectric coupler U2, pin 3 of the photoelectric coupler U2 is grounded, pin 4 of the photoelectric coupler U2 is connected to the bidirectional thyristor driver, and the heating objects are respectively connected in two ways, one way is connected to one end of the switch of the relay Relay1, and the other way is connected to the resistor R6, the first anode of the bidirectional thyristor Q2 and one end of the resistor R7. The bidirectional thyristor driver is connected to the control level of the bidirectional thyristor Q2 and the other end of the resistor R7. The other end of the resistor R6 is connected to the capacitor C1, and the bidirectional thyristor driver is combined with the second anode of the bidirectional thyristor Q2 and the other end of the capacitor C1 to connect the other end of the switch of the relay Relay1.

[0019] Preferably, the phase detection circuit includes 220VAC, a voltage transformer connected to 220VAC, and a phase detection port.

[0020] Preferably, the voltage transformer is divided into two paths and respectively connected to pin 2 and pin 3 of the operational amplifier U3, a resistor R11 is connected in parallel between the two paths of the voltage transformer, pin 4 of the operational amplifier U3 is grounded, pin 1 of the operational amplifier U3 is connected to one end of the resistor R10 and pin 2 of the photoelectric coupler U4, pin 1 of the photoelectric coupler U4 is connected to one end of the resistor R8, the other end of the resistor R8, the other end of the resistor R10 and pin 8 of the operational amplifier U3 are connected to VCC, pin 3 of the photoelectric coupler U4 is connected to the 3V3 ground wire, pin 4 of the photoelectric coupler U4 is connected to the phase detection port and one end of the resistor R9, and the other end of the resistor R9 is connected to 3V3.

[0021] Preferably, the temperature algorithm flow of the heating control circuit is as follows: the MCU collects the temperature of the system, and then performs temperature compensation calculation through Kalman filtering, fuzzy PID and compensation algorithm to correct the system temperature.

[0022] Preferably, the phase-triggered heating method is that the MCU receives a phase detection signal, controls the heating object through a heating control circuit, generates a temperature change, performs temperature detection through a temperature detection module, and transmits the temperature to the MCU.

[0023] After adopting the above structure, the present invention has the following advantages:

[0024] The present invention highly integrates the zirconia oxygen analyzer body, temperature detection module, zirconium potential acquisition circuit, phase detection circuit, heating control circuit, display device, etc. For the intelligent temperature control system, there are very high requirements for accurate temperature detection, precise temperature control, rapid system heating, and controllable output power. Fuzzy PID algorithm, Kalman filter algorithm, compensation algorithm, etc. are used in software, and cold end compensation, phase detection and heating control are used in hardware to ensure the accuracy, safety, real-time performance and scalability of the system.

[0025] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present invention will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 It is the overall framework diagram of the system of the present invention;

[0028] Figure 2 It is a comparison diagram of the heating methods of the present invention;

[0029] Figure 3 is a flow chart of the temperature control algorithm of the present invention;

[0030] Figure 4 It is a flow chart of the phase-triggered heating method of the present invention;

[0031] Figure 5 is a heating control circuit diagram of the present invention;

[0032] Figure 6 is a phase detection circuit diagram of the present invention;

[0033] Figure 7 It is a signal acquisition circuit diagram of the present invention. DETAILED DESCRIPTION

[0034] Specific embodiments of the present invention will now be mentioned in detail. Although the present invention is described in conjunction with these specific embodiments, it should be appreciated that it is not intended to limit the present invention to these specific embodiments. On the contrary, these embodiments are intended to cover substitutions, changes or equivalent embodiments that may be included in the spirit and scope of the invention defined by the claims. In the following description, a large number of specific details are set forth in order to provide a comprehensive understanding of the present invention. The present invention can be implemented without some or all of these specific details. In other cases, in order not to make the present invention unnecessarily obscure, well-known process operations are not described in detail.

[0035] When used in conjunction with "including," "methods comprising," or similar language in this specification and the appended claims, the singular forms "a," "an," and "the" include plural references unless the context clearly dictates otherwise. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0036] The present invention is further described in detail below in conjunction with the full text.

[0037] Combined with Figure 1-Figure 7 , an intelligent temperature control system for a zirconia oxygen analyzer, comprising a zirconia oxygen analyzer body, a housing body for integrating and assembling parts;

[0038] Temperature detection module, used for real-time detection and feedback of heating status, and collection of the temperature of the heating object;

[0039] When the zirconium potential acquisition circuit is used for thermocouple acquisition, the change of cold end temperature will affect the acquisition temperature. The bridge compensation method is added to correct the system temperature, and the electromotive force generated by the unbalanced bridge is used to compensate for the change of thermoelectric potential caused by the change of the cold end temperature of the thermocouple.

[0040] The phase detection circuit uses a phase-triggered heating method to set the conduction angle of the thyristor, which can control the conduction frequency of the heating, making the system respond faster and the temperature control more accurate;

[0041] Heating control circuit; used to control the heating of the heating object, control the temperature of the heating object in real time, and realize automatic adjustment by controlling the heating coefficient;

[0042] Display device: a display screen for displaying local potential, system temperature, time, and the system parameters can be changed through the menu.

[0043] The heating control circuit includes a heating cutout, a heating object, a heating control port, a photoelectric coupler U1, a photoelectric coupler U2 and a P-MOS.

[0044] Pin 1 of the photocoupler U1 is connected to 3V3 through a series resistor R3, pin 1 of the photocoupler U2 is connected to 3V3 through a series resistor R5, the heating incision is connected to pin 2 of the photocoupler U1, pin 4 of the photocoupler U1 is connected to resistor R2, the other end of resistor R2 is respectively connected to resistor R1 and the G pole of P-MOS, the other end of resistor R1 is combined with the S pole of P-MOS to connect to VCC, the D pole of P-MOS is respectively connected to resistor R4, diode D2 and relay Relay1, the other end of resistor R4 is connected to indicator light LED0, the other end of indicator light LED0, pin 3 of the photocoupler U1, the other end of diode D2 and relay One end of the device Relay1 is grounded, the heating control port is connected to pin 2 of the photocoupler U2, pin 3 of the photocoupler U2 is grounded, pin 4 of the photocoupler U2 is connected to the bidirectional thyristor driver, and the heating objects are respectively connected in two ways, one way is connected to one end of the switch of the relay Relay1, and the other way is connected to the resistor R6, the first anode of the bidirectional thyristor Q2 and one end of the resistor R7. The bidirectional thyristor driver is connected to the control level of the bidirectional thyristor Q2 and the other end of the resistor R7. The other end of the resistor R6 is connected to the capacitor C1, and the bidirectional thyristor driver is combined with the second anode of the bidirectional thyristor Q2 and the other end of the capacitor C1 to connect the other end of the switch of the relay Relay1.

[0045] The phase detection circuit includes 220VAC, a voltage transformer connected to 220VAC, and a phase detection port.

[0046] The voltage transformer is divided into two paths and connected to pin 2 and pin 3 of the operational amplifier U3 respectively. A resistor R11 is connected in parallel between the two paths of the voltage transformer. Pin 4 of the operational amplifier U3 is grounded. Pin 1 of the operational amplifier U3 is connected to one end of the resistor R10 and pin 2 of the photoelectric coupler U4. Pin 1 of the photoelectric coupler U4 is connected to one end of the resistor R8. The other end of the resistor R8, the other end of the resistor R10 and pin 8 of the operational amplifier U3 are connected to VCC. Pin 3 of the photoelectric coupler U4 is connected to the 3V3 ground wire. Pin 4 of the photoelectric coupler U4 is connected to the phase detection port and one end of the resistor R9. The other end of the resistor R9 is connected to 3V3.

[0047] The temperature algorithm flow of the heating control circuit is as follows: the MCU collects the temperature of the system, and then performs temperature compensation calculation through Kalman filtering, fuzzy PID and compensation algorithm to correct the system temperature.

[0048] The phase-triggered heating method is that the MCU receives the phase detection signal, controls the heating object through the heating control circuit, generates temperature changes, performs temperature detection through the temperature detection module, and transmits the temperature to the MCU.

[0049] Embodiment 1:

[0050] like Figure 5-Figure 7 As shown, when the heating input port is low, the photocoupler U1 is turned on, Q1 is also turned on, and Relay1 is energized; when the heating input port is high, the photocoupler U1 is turned off, Q1 is not turned on, and Relay1 is disconnected. When the heating control port is low, the photocoupler U2 is turned on, and the bidirectional thyristor Q2 is also turned on; otherwise, the bidirectional thyristor Q2 is not turned on. When the heating input port and the heating control port are both low levels, the heating object is heated, otherwise it is not heated. Q1 is a P-MOS and Relay1 is a relay. After the 220V AC enters, it passes through the voltage transformer and enters the operational amplifier U3. The operational amplifier U3 compares the phase and outputs high and low levels. When the output is low, the phase detection port detects a high level; otherwise, a low level is detected, and the temperature change is the change in the resistance value of Rt, and the bridge output produces a voltage difference. Rt is a thermistor.

[0051] Embodiment 2:

[0052] The intelligent temperature control system for a zirconium oxide oxygen analyzer of the present invention integrates a zirconium oxide oxygen analyzer body, a temperature detection circuit, a zirconium potential acquisition circuit, a phase detection circuit, a heating control circuit, and a display device.

[0053] Intelligent temperature control system: The present invention includes a zirconia oxygen analyzer body, a temperature detection circuit, a zirconium potential acquisition circuit, a phase detection circuit, a heating control circuit, and a display device. At present, an intelligent temperature control system for a zirconia oxygen analyzer has appeared for the first time. The system has a high degree of accuracy and reliability, and improves the efficiency, quality and safety of work.

[0054] Controllable power output: The core content of this invention is the controllable power output. In different heating systems, accurate temperature and fast response are required. The heating system before this usually uses a zero-crossing trigger circuit, which leads to a long control cycle, such as Figure 2 As shown, the present invention can set the conduction angle of the thyristor and control the conduction frequency of the heating, so that the system responds faster, the temperature control is more accurate, and the applicability is greatly enhanced.

[0055] Design of signal acquisition circuit: When collecting thermocouples, changes in the cold end temperature will affect the collected temperature. This system adds a bridge compensation method to correct the system temperature, and uses the electromotive force generated by the unbalanced bridge to compensate for the change in thermoelectric potential caused by the change in the cold end temperature of the thermocouple. The hardware circuit is simple and easy to implement, with stable performance and low cost.

[0056] Data display and control: The intelligent temperature control system has a 3.5-inch serial display interface, which can display local potential, system temperature and other information in real time, and the system parameters can be changed through the menu.

[0057] This system can detect and feedback the heating status in real time, and adopts advanced control algorithms to greatly reduce the error of detection data, and finally achieve more accurate temperature control. This is crucial to maintain system temperature, product quality, output rate, and industrial production safety. The controllable power output is used for heating, with accurate temperature control, fast response speed, and strong applicability, ensuring that the system is more stable, timely, safe and reliable.

[0058] The intelligent temperature control system for the zirconia oxygen analyzer of the present invention adopts a phase-triggered heating method. In different heating systems, the conduction angle of the thyristor is set to control the conduction frequency of the heating, so that the system responds faster and the temperature control is more accurate.

[0059] The present invention and its embodiments are described above, and such description is not restrictive. What is shown in the full text is only one of the embodiments of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. An intelligent temperature control system for a zirconium oxide oxygen analyzer, characterized in that: include Zirconia oxygen analyzer body, used for integrating the shell body of the assembled parts; Temperature detection module, used for real-time detection and feedback of heating status, and collection of the temperature of the heating object; When the zirconium potential acquisition circuit is used for thermocouple acquisition, the change of cold end temperature will affect the acquisition temperature. The bridge compensation method is added to correct the system temperature, and the electromotive force generated by the unbalanced bridge is used to compensate for the change of thermoelectric potential caused by the change of the cold end temperature of the thermocouple. The phase detection circuit uses a phase-triggered heating method to set the conduction angle of the thyristor, which can control the conduction frequency of the heating, making the system respond faster and the temperature control more accurate; Heating control circuit; used to control the heating of the heating object, control the temperature of the heating object in real time, and realize automatic adjustment by controlling the heating coefficient; Display device: a display screen for displaying local potential, system temperature, time, and the system parameters can be changed through the menu.

2. A power supply circuit according to claim 1, characterized in that: The heating control circuit comprises a heating cutout, a heating object, a heating control port, a photoelectric coupler U1, a photoelectric coupler U2 and a P-MOS.

3. A power supply circuit according to claim 2, characterized in that: Pin 1 of the photocoupler U1 is connected to 3V3 through a series resistor R3, pin 1 of the photocoupler U2 is connected to 3V3 through a series resistor R5, the heating incision is connected to pin 2 of the photocoupler U1, pin 4 of the photocoupler U1 is connected to resistor R2, the other end of resistor R2 is respectively connected to resistor R1 and the G pole of P-MOS, the other end of resistor R1 is combined with the S pole of P-MOS to connect to VCC, the D pole of P-MOS is respectively connected to resistor R4, diode D2 and relay Relay1, the other end of resistor R4 is connected to indicator light LED0, the other end of indicator light LED0, pin 3 of the photocoupler U1, the other end of diode D2 and relay One end of the device Relay1 is grounded, the heating control port is connected to pin 2 of the photocoupler U2, pin 3 of the photocoupler U2 is grounded, pin 4 of the photocoupler U2 is connected to the bidirectional thyristor driver, and the heating objects are respectively connected in two ways, one way is connected to one end of the switch of the relay Relay1, and the other way is connected to the resistor R6, the first anode of the bidirectional thyristor Q2 and one end of the resistor R7. The bidirectional thyristor driver is connected to the control level of the bidirectional thyristor Q2 and the other end of the resistor R7. The other end of the resistor R6 is connected to the capacitor C1, and the bidirectional thyristor driver is combined with the second anode of the bidirectional thyristor Q2 and the other end of the capacitor C1 to connect the other end of the switch of the relay Relay1.

4. A power supply circuit according to claim 1, characterized in that: The phase detection circuit includes 220VAC, a voltage transformer connected to 220VAC, and a phase detection port.

5. A power supply circuit according to claim 4, characterized in that: The voltage transformer is divided into two paths and connected to pin 2 and pin 3 of the operational amplifier U3 respectively. A resistor R11 is connected in parallel between the two paths of the voltage transformer. Pin 4 of the operational amplifier U3 is grounded. Pin 1 of the operational amplifier U3 is connected to one end of the resistor R10 and pin 2 of the photoelectric coupler U4. Pin 1 of the photoelectric coupler U4 is connected to one end of the resistor R8. The other end of the resistor R8, the other end of the resistor R10 and pin 8 of the operational amplifier U3 are connected to VCC. Pin 3 of the photoelectric coupler U4 is connected to the 3V3 ground wire. Pin 4 of the photoelectric coupler U4 is connected to the phase detection port and one end of the resistor R9. The other end of the resistor R9 is connected to 3V3.

6. A power supply circuit according to claim 1, characterized in that: The temperature algorithm flow of the heating control circuit is as follows: the MCU collects the temperature of the system, and then performs temperature compensation calculation through Kalman filtering, fuzzy PID and compensation algorithm to correct the system temperature.

7. A power supply circuit according to claim 1, characterized in that: The phase-triggered heating method is that the MCU receives the phase detection signal, controls the heating object through the heating control circuit, generates temperature changes, performs temperature detection through the temperature detection module, and transmits the temperature to the MCU.

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