Magnetic metal flow measuring and adjusting device and method
By designing a magnetic metal flow measurement and regulation device, the problem of overflow tube flow in sodium-cooled fast reactor evaporator exceeding the design range is solved, effective flow measurement and closed-loop adjustment are realized, and the operationability and control performance of the system are improved.
Patent Information
- Application Number
- CN202411600130.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-11
- Publication Date
- 2025-03-04
AI Technical Summary
The flow rate of the overflow tube in the sodium-cooled fast reactor evaporator exceeds the design range, resulting in the bubble noise detector not working properly and the closed-loop regulation of the flow rate cannot be achieved.
Design a magnetic metal flow measurement and regulation device, including a signal acquisition module, a power supply and power conversion module, a signal processing module, a flow output module, a guide rail and a fixing device and a box. By copying, collecting, amplifying and isolating the signals of the bubble noise detector, it is converted into a standard 4-20mA signal or 1-5VDC signal, flow measurement and closed-loop adjustment are achieved.
Effective measurement and closed-loop adjustment of overflow pipe flow are realized, the operationability and control performance of the system are improved, and the operating costs are reduced.
Smart Images
Figure CN119554574A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of instrumentation and control, and in particular relates to a magnetic metal flow measurement and regulation device and method. Background Art
[0002] The overflow pipe installed in the sodium-cooled fast reactor evaporator is used to return the overflow of the evaporator to the buffer tank. A hydrogen meter, a bubble noise detector and a corresponding overflow valve (shut-off valve) are installed on the overflow pipe. The hydrogen meter is used to measure the hydrogen content in the overflow pipe to monitor the hydrogen produced by the sodium-water reaction that may occur in the system; the bubble noise detector is used to monitor whether there is gas in the overflow pipe to determine whether there is hydrogen produced by the sodium-water sodium-water reaction in the system, or other forms of gas; the overflow valve is used to isolate the evaporator in the event of a sodium-water event. The overflow pipe diameter is designed to be φ48mm. At the beginning of the system design, no flow meter was designed in the loop. Only an indirect flow calculation device was designed in the bubble noise detector through the bubble collection loop in the overflow pipe. Since the actual flow of the system is about 35m 3 / h is much larger than the designed flow rate 7m 3 / h, causing the bubble noise detector to exceed the flow rate for a long time and fail to work. To this end, possible technical means include: overflow valve inching control, modifying the bubble noise meter range, adding a regulating valve to the overflow pipe, and modifying the pipe diameter. Since modifying the pipe diameter will affect the design of the bubble noise and hydrogen meter, it is not advisable to modify it; adding a regulating valve will have a greater impact on the piping layout of the system, so it is also not advisable to modify it; since the bubble noise meter has been manufactured, the flow cannot be modified. Manual open-loop flow regulation is achieved on site by adopting inching control of the overflow valve. However, this flow cannot be sent to the main control, nor can closed-loop regulation be achieved. Summary of the invention
[0003] The purpose of the present invention is to provide a magnetic metal flow measurement and regulation device and method, which can realize the measurement and closed-loop regulation of overflow pipe flow.
[0004] The technical solution of the present invention is as follows: a magnetic metal flow measurement and regulation device, including a signal acquisition module, a power supply and power conversion module, a signal processing module, a flow output module, a guide rail and a fixing device and a box.
[0005] The signal acquisition module includes a copy module and an isolation and amplification module, which copies, collects, amplifies, and isolates the signal sent by the bubble noise detector to the secondary instrument, and copies, collects, amplifies mV, and provides the query voltage of the module. The output is the copied mV signal and the amplified 1-5V standard voltage signal, as well as the 4-20mA standard current signal. The signal is output to the rear processing module and is directly output to the third-party data processing system after isolation.
[0006] The power supply and power conversion module provides an interface and includes a voltage-stabilizing power supply module, which converts 220VAC power into a stable 12-36VDC standard DC power supply.
[0007] The signal processing module includes a PLC main control module, which processes the signal output by the acquisition module, converts the input signal into a flow signal, and outputs a standard 4-20mA signal or a 1-5VDC signal.
[0008] The box has an outer dimension of a 300mm*300mm*300mm metal cube, and includes a power input point, an input opening and an output opening at the bottom of the box. Two rows of guide rails are arranged inside the box. The upper row of guide rails is used to fix the power conversion module and the main control module, and the lower row of guide rails is used to fix the input module and the flow output module. The module has its own input and output terminals.
[0009] The flow output module is implemented by a universal analog output card, that is, the data representing the flow size processed by the signal processing module is converted into a standard 4-20mA signal or a 1-5VDC signal.
[0010] The duplication module is implemented by a general isolation and distribution module, which divides the input signal into two and then outputs them.
[0011] The isolation and amplification module is implemented using a universal isolation and amplification module, and uses a signal amplifier to achieve the isolation and amplification functions of the primary signal.
[0012] A magnetic metal flow measurement and regulation method comprises the following steps: the collected initial signal is a spectrum signal, the spectrum signal is converted into a weak millivolt signal through data analysis and processing, the stable spectrum signal is linearly converted into a standard signal in the stage of stable flow without interference, and the flow is regulated by adjusting the opening of a flow regulating valve to achieve flow regulation; in the stage of interference or fluctuation of flow, the opening of the flow regulating valve is open-loop regulated, the valve opening is manually adjusted to a certain opening first, and after the flow is stabilized, it is switched back to closed-loop regulation.
[0013] The beneficial effects of the present invention are: 1) the present invention does not change the main structure of the current system and equipment, and realizes functions such as flow collection, remote transmission processing, and control by cleverly processing the primary signal collected by the detector, which can greatly improve the operability of the system and reduce the operating cost; 2) the present invention provides an intuitive flow collection and display method to improve the operability of the system; 3) the present invention can be used to realize the control and adjustment function of the sodium valve, improve the operability and control performance of the system, and reduce the operating cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1A schematic diagram of a magnetic metal flow measurement and regulation device provided by the present invention;
[0015] Figure 2 This is a schematic diagram of the box. DETAILED DESCRIPTION
[0016] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.
[0017] like Figure 1 As shown, a magnetic metal flow measurement and regulation device converts the collected bubble noise detection signal into an applicable metal flow signal. The device includes a signal acquisition module, a power supply and power conversion module, a signal processing module, a flow output module, a guide rail and a fixing device, and an external box.
[0018] The signal acquisition module includes a copy module and an isolation and amplification module, which copies, collects, amplifies, and isolates the signal sent by the bubble noise detector to the secondary instrument. Its front-end design copies, collects, and amplifies the mV module, and provides the query voltage of the module. The output of the module is the copied mV signal and the amplified 1-5V standard voltage signal and 4-20mA standard current signal. The signal can be output to the rear processing module, or it can be directly output to a third-party data processing system after isolation.
[0019] The power supply and power conversion module provides an interface, including a voltage-stabilized power supply module, which converts 220VAC power into a stable 12-36VDC standard DC power supply. If the external system provides a stable 24VDC power supply, this module can be bypassed and the 24VDC power supply can be directly connected.
[0020] The signal processing module includes a set of PLC main control modules, which can process the signals output by the acquisition module, convert the input signals into flow signals through internal algorithms, and output standard 4-20mA signals or 1-5VDC signals.
[0021] The box has an outer dimension of 300mm*300mm*300mm metal cube. The box must meet the IP65 rating, and the bottom of the box includes 1 power input point, 1 input opening and 1 output opening. Two rows of rails are set inside the box. The upper row of rails is used to fix the power conversion module and the main control module, and the lower row of rails is used to fix the input module (including the signal acquisition and replication module, the isolation amplifier module) and the flow output module. The module has its own input and output terminals.
[0022] The flow output module is implemented using a universal AO (analog output) card, which converts the data representing the flow size processed by the signal processing module into a standard 4-20mA signal or a 1-5VDC signal.
[0023] The replication module is implemented using a universal isolation distribution module, which splits the input signal into two and then outputs them.
[0024] The isolation amplifier module is implemented with a universal isolation amplifier module and uses a signal amplifier to achieve the isolation and amplification functions of the primary signal.
[0025] Signal acquisition modules and signal processing modules are both very mature products on the market. After being packaged, they can directly collect and process signals. For example, the signal acquisition card (AI / DI) and signal processor of Siemens PLC system. Another example is the signal acquisition card (AI / DI) and CPU module / main control module of domestic DCS control system.
[0026] A magnetic metal flow measurement and regulation method, using the principle of electromagnetic induction, the collected initial signal is a spectrum signal, and the spectrum signal is converted into a weak millivolt signal through data analysis and processing. Since the signal received by the general digital control system is a standard 4-20mA signal, it is necessary to convert the weak millivolt signal into a standard signal. In addition, in the measurement of liquid metal flow, there are many interference sources, the signal noise is large, which is not conducive to the measurement of flow, and the flow measurement value is used to adjust the relevant regulating valve to achieve the flow regulation function, so it is necessary to shield such noise in the flow regulation stage. The present invention realizes the above two functions, in the stage where the flow is stable and there is no interference, the stable spectrum signal (weak millivolt signal) is linearly converted into a standard signal, and the flow is regulated by the flow regulating valve opening to achieve flow regulation; in the stage where the flow is disturbed or fluctuated, the flow regulating valve opening is open-loop regulated, the valve opening is manually adjusted to a certain opening, and after the flow is stabilized, it is switched back to closed-loop regulation.
[0027] The characteristics of the present invention are as follows:
[0028] 1) The appearance and internal module design of the magnetic metal flow measurement and regulation device.
[0029] 2) The processing methods of flow collection, replication, isolation, and amplification of magnetic metal flow measurement and regulation devices, and the processing methods of signal output.
[0030] 3) Signal processing method and signal processing algorithm of magnetic metal flow measurement and regulation device.
[0031] The above descriptions are only preferred implementation modes of the present invention. As long as the technical solutions for the purposes of the present invention are achieved by substantially the same means, they are within the protection scope of the present invention.
[0032] Obviously, the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims
1. A magnetic metal flow measurement and regulation device, characterized in that: It includes a signal acquisition module, a power supply and power conversion module, a signal processing module, a flow output module, a guide rail and a fixing device and a box.
2. A magnetic metal flow measurement and regulation device as claimed in claim 1, characterized in that: The signal acquisition module includes a copy module and an isolation and amplification module, which copies, collects, amplifies, and isolates the signal sent by the bubble noise detector to the secondary instrument, and copies, collects, amplifies mV, and provides the query voltage of the module. The output is the copied mV signal and the amplified 1-5V standard voltage signal, as well as the 4-20mA standard current signal. The signal is output to the rear processing module and is directly output to the third-party data processing system after isolation.
3. A magnetic metal flow measurement and regulation device as claimed in claim 1, characterized in that: The power supply and power conversion module provides an interface and includes a voltage-stabilizing power supply module, which converts 220VAC power into a stable 12-36VDC standard DC power supply.
4. A magnetic metal flow measurement and regulation device as claimed in claim 1, characterized in that: The signal processing module includes a PLC main control module, which processes the signal output by the acquisition module, converts the input signal into a flow signal, and outputs a standard 4-20mA signal or a 1-5VDC signal.
5. A magnetic metal flow measurement and regulation device as claimed in claim 1, characterized in that: The box has an outer dimension of a 300mm*300mm*300mm metal cube, and includes a power input point, an input opening and an output opening at the bottom of the box. Two rows of guide rails are arranged inside the box. The upper row of guide rails is used to fix the power conversion module and the main control module, and the lower row of guide rails is used to fix the input module and the flow output module. The module has its own input and output terminals.
6. A magnetic metal flow measurement and regulation device as claimed in claim 1, characterized in that: The flow output module is implemented by a universal analog output card, that is, the data representing the flow size processed by the signal processing module is converted into a standard 4-20mA signal or a 1-5VDC signal.
7. A magnetic metal flow measurement and regulation device as claimed in claim 2, characterized in that: The duplication module is implemented by a general isolation and distribution module, which divides the input signal into two and then outputs them.
8. A magnetic metal flow measurement and regulation device as claimed in claim 2, characterized in that: The isolation and amplification module is implemented using a universal isolation and amplification module, and uses a signal amplifier to achieve the isolation and amplification functions of the primary signal.
9. A method for measuring and regulating magnetic metal flow, characterized in that: It includes the following: the initial signal collected is a spectrum signal, which is converted into a weak millivolt signal through data analysis and processing. When the flow is stable and there is no interference, the stable spectrum signal is linearly converted into a standard signal, and the flow is adjusted by using the flow to adjust the flow control valve opening to achieve flow regulation; when the flow is disturbed or fluctuated, the flow control valve opening is open-loop adjusted, and the valve opening is manually adjusted to a certain opening first, and then switched back to closed-loop regulation after the flow is stable.