Gas pressure regulating metering control system with double pneumatic cut-off protection

Abstract

The utility model discloses a gas pressure regulating metering control system with double pneumatic cut-off protection. The gas pressure regulating metering control system comprises an inlet pressure transmitter, a first pneumatic valve, a first pressure transmitter, a flow transmitter, a temperature transmitter, a self-operated cut-off valve, a self-operated regulating valve, a second pneumatic valve and an outlet pressure transmitter which are connected in sequence, the system further comprises a flow computer, a display module and a PLC controller. The flow computer is electrically connected with the first pressure transmitter, the flow transmitter and the temperature transmitter; the PLC is electrically connected with the inlet pressure transmitter, the outlet pressure transmitter, the first pneumatic valve, the second pneumatic valve and the flow computer. And the display module is electrically connected with the PLC. According to the utility model, the technical effects of fast and stable on-off control of medium flow in the metering control system and real-time acquisition of the current motion state of the metering control system are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of metering systems, in particular to a gas pressure regulating metering control system with double pneumatic cut-off protection. Background Art

[0002] In the energy industry, due to the flammable and explosive nature of some media, safe operation is particularly important. Once a danger occurs, it will cause irreversible economic losses and casualties. At the same time, it will also damage upstream and downstream related equipment.

[0003] In the related art, a manual stop valve is set at the inlet and outlet of the pipeline to manually control the on and off of the fluid. However, since the manual stop valve needs to be opened or closed manually, when the valve diameter is large, the torque of the handle or handwheel is large, and the manual operation is time-consuming and labor-intensive. When an emergency occurs in the transmission pipeline, the line cannot be cut off and isolated in the first place. Utility Model Content

[0004] The main purpose of the utility model is to provide a gas pressure regulating and metering control system with dual pneumatic cut-off protection, so as to solve the problems of slow control response speed and low stability of the metering system for fluid on-off in the related art.

[0005] In order to achieve the above-mentioned object, the utility model provides a gas pressure regulating and metering control system with dual pneumatic cut-off protection, comprising: an inlet pressure transmitter, a first pneumatic valve, a first pressure transmitter, a flow transmitter, a temperature transmitter, a self-operated cut-off valve, a self-operated regulating valve, a second pneumatic valve and an outlet pressure transmitter connected in sequence;

[0006] It also includes a flow computer, display module and PLC controller;

[0007] The flow computer is electrically connected to the first pressure transmitter, the flow transmitter and the temperature transmitter;

[0008] The PLC controller is electrically connected to the inlet pressure transmitter, the outlet pressure transmitter, the first pneumatic valve, the second pneumatic valve and the flow computer;

[0009] The display module is electrically connected to the PLC controller.

[0010] Furthermore, the first pressure transmitter and the temperature transmitter are configured to output two-wire active high-precision 4-20mA signals, and the signal output ends of the first pressure transmitter and the temperature transmitter are connected to the IO channel of the flow computer.

[0011] Furthermore, the flow transmitter is connected to the serial communication channel of the flow computer via an RS485 serial port.

[0012] Furthermore, the flow computer transmits the flow signal to the PLC controller via the RS485 serial port.

[0013] Furthermore, the first pneumatic valve and the second pneumatic valve both include an actuator, and the actuator is configured to receive a 24VDC direct current control command signal output by the PLC controller and output an SPDT signal, and the actuator signal is connected to the PLC controller I / O interface.

[0014] Furthermore, the control command signal output by the PLC controller is set to be an ESD redundant signal.

[0015] Further, the temperature transmitter is electrically connected to the PLC controller;

[0016] The inlet pressure transmitter, the outlet pressure transmitter and the temperature transmitter are configured to output two-wire active high-precision 4-20mA signals, and the signal output ends of the inlet pressure transmitter, the outlet pressure transmitter and the temperature transmitter are connected to the IO channel of the PLC controller.

[0017] Furthermore, the inlet pressure transmitter, the first pressure transmitter, the outlet pressure transmitter and the temperature transmitter are all configured with a local display module, and the local display module is used to display corresponding pressure values ​​and temperature values.

[0018] Furthermore, the display module includes an HMI.

[0019] Furthermore, it also includes an input pipeline, a connecting pipeline and an output pipeline, wherein the connecting pipeline is provided in two groups and connected in parallel between the input pipeline and the output pipeline;

[0020] The inlet pressure transmitter and the first pneumatic valve are arranged on the input pipeline, the outlet pressure transmitter and the second pneumatic valve are arranged on the output pipeline, and the first pressure transmitter, flow transmitter, temperature transmitter, self-operated shut-off valve, and self-operated regulating valve are arranged on the connecting pipeline.

[0021] In the embodiment of the utility model, an inlet pressure transmitter, a first pneumatic valve, a first pressure transmitter, a flow transmitter, a temperature transmitter, a self-operated shut-off valve, a self-operated regulating valve, a second pneumatic valve and an outlet pressure transmitter are arranged in sequence; a flow computer, a display module and a PLC controller are also included; the flow computer is electrically connected to the first pressure transmitter, the flow transmitter and the temperature transmitter; the PLC controller is electrically connected to the inlet pressure transmitter, the outlet pressure transmitter, the first pneumatic valve, the second pneumatic valve and the flow computer; the display module is electrically connected to the PLC controller, so that the PLC controller can collect the inlet pressure transmitter and the outlet pressure transmitter in real time. The pressure value of the pressure transmitter can be controlled by the PLC controller to pneumatically cut off the flow of the medium in the pipeline when the pressure value exceeds the set value, and the medium pressure, flow and temperature parameters in the system can be collected by the flow computer and processed. During the medium transportation process, the display module can be used to display the current operating status of the metering control system in real time, thereby achieving the technical effect of fast and stable on-off control of the medium flow in the metering control system and real-time acquisition of the current movement state of the metering control system, thereby solving the problem of slow control response speed of the metering system for fluid on-off and low stability in use in the related technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings constituting a part of the present invention are used to provide a further understanding of the present invention, so that other features, purposes and advantages of the present invention become more obvious. The drawings and descriptions of the schematic embodiments of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0023] Figure 1 is a connection diagram of a metering control system according to an embodiment of the present invention;

[0024] Figure 2 is a schematic diagram of a metering control system according to another embodiment of the present invention;

[0025] Among them, 1 is an inlet pressure transmitter, 2 is a first pneumatic valve, 3 is a first pressure transmitter, 4 is a flow transmitter, 5 is a flow computer, 6 is a temperature transmitter, 7 is a self-operated cut-off valve, 8 is a self-operated regulating valve, 9 is an outlet pressure transmitter, 10 is a second pneumatic valve, 11 is a PLC controller, 12 is a display module, 13 is an input pipeline, 14 is a connecting pipeline, and 15 is an output pipeline. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0027] It should be noted that the terms "first", "second", etc. in the specification and claims of the utility model 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 data used in this way can be interchanged under appropriate circumstances, so as to describe the embodiments of the utility model described here.

[0028] In the present invention, the directions or positional relationships indicated by the terms "upper", "lower", "inner", etc. are based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction.

[0029] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this utility model can be understood according to specific circumstances.

[0030] In addition, the terms "disposed", "provided with", "connected", "fixed" and the like should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0031] In addition, the term "plurality" shall mean two or more.

[0032] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] To solve relevant technical problems, such as Figure 1As shown, the embodiment of the utility model provides a gas pressure regulating and metering control system with dual pneumatic cut-off protection, comprising: an inlet pressure transmitter 1, a first pneumatic valve 2, a first pressure transmitter 3, a flow transmitter 4, a temperature transmitter 6, a self-operated cut-off valve 7, a self-operated regulating valve 8, a second pneumatic valve 10 and an outlet pressure transmitter 9 connected in sequence;

[0034] It also includes a flow computer 5, a display module 12 and a PLC controller 11;

[0035] The flow computer 5 is electrically connected to the first pressure transmitter 3, the flow transmitter 4 and the temperature transmitter 6;

[0036] The PLC controller 11 is electrically connected to the inlet pressure transmitter 1, the outlet pressure transmitter 9, the first pneumatic valve 2, the second pneumatic valve 10 and the flow computer 5;

[0037] The display module 12 is electrically connected to the PLC controller 11 .

[0038] In this embodiment, the metering control system mainly includes a flow metering system part, an emergency cut-off protection system part, a PLC control part and a status display part. The flow metering system part mainly includes a flow computer 5, an inlet pressure transmitter 1, a first pressure transmitter 3, a flow transmitter 4, a temperature transmitter 6 and an outlet pressure transmitter 9, a self-operated cut-off valve 7 and a self-operated regulating valve 8. The emergency cut-off protection system part mainly includes a first pneumatic valve 2 and a second pneumatic valve 10. The PLC control part mainly includes a PLC controller 11, and the status display part mainly includes a display module 12.

[0039] In this embodiment, the PLC control part is at least used to collect pressure parameters in the flow metering system, and can control the actuator action in the emergency cut-off protection system based on the pressure parameters to achieve on-off control of the medium flow. In this process, the status display module 12 can display the system operation status based on the collected parameters, and the display content includes the pressure value, temperature value, flow rate, opening and closing status of related valves, etc. at various positions in the system.

[0040] In one embodiment, during the operation of the metering control system, the PLC controller 11 collects the signals output by the inlet pressure transmitter 1 and the outlet pressure transmitter 9, converts the current analog signal into a digital signal through corresponding logical operations, and transmits it to the display module 12 for display after matching according to the measuring range. In addition, the PLC controller 11 can also collect the first pneumatic valve 2 and the second pneumatic valve 10, and transmit the current state of the valve (all closed, all open) to the display module 12 for display through the corresponding signal channel. It can also transmit the command signal to the first pneumatic valve 2 and the second pneumatic valve 10 through the corresponding signal channel, so as to control the switching action of the first pneumatic valve 2 and the second pneumatic valve 10.

[0041] The first pressure transmitter 3 and the temperature transmitter 6 arranged at both ends of the flow transmitter 4 can be used for pressure correction and temperature correction respectively. That is, the signals of the first pressure transmitter 3 for pressure correction, the temperature transmitter 6 for temperature correction, and the flow transmitter 4 are first uploaded to the flow computer 5, and the flow computer 5 can directly obtain the working state value of the flow transmitter 4 (hereinafter referred to as the working state value). After the flow computer 5 performs temperature and pressure correction, it can calculate the handover standard state value (hereinafter referred to as the standard state value), and then the flow computer 5 can display the temperature value, pressure value, working state value and standard state value of the metering control system part and the cumulative value obtained after calculation and other parameters on the display module 12.

[0042] In this embodiment, the PLC controller 11 collects the pressure values ​​of the inlet pressure transmitter 1 and the outlet pressure transmitter 9 in real time. When the pressure value exceeds the set value, the PLC controller 11 can control the first pneumatic valve 2 and the second pneumatic valve 10 to pneumatically cut off the flow of the medium in the pipeline, and the flow computer 5 can collect and process the medium pressure, flow and temperature parameters in the system. During the medium transportation process, the display module 12 can be used to display the operating status of the current metering control system in real time, thereby achieving the technical effect of quickly and stably controlling the on-off control of the medium flow in the metering control system and obtaining the current movement state of the metering control system in real time, thereby solving the problem of slow control response speed of the metering system for fluid on-off and low stability in use in the related technology.

[0043] As for the display module 12, the display module 12 includes an HMI, which can perform human-computer interaction while displaying relevant information. Therefore, the inlet pressure protection value and the outlet pressure protection value can be input into the touch screen as required, and the interlocking protection logic can be selected to enable. When the inlet pressure exceeds the protection value, in order to ensure the stable operation of the system, a duration can be set inside the PLC controller 11. When the pressure is continuously high and reaches the duration, the PLC controller 11 sends a control command to the first pneumatic valve 2 to control the first pneumatic valve 2 to close, cut off the connection with the upstream, and ensure that the equipment is not damaged. Since the downstream equipment may be a combustion equipment that is more sensitive to pressure, if the outlet pressure exceeds the protection value, the PLC controller 11 will make a logical judgment and send a control command to the second pneumatic valve 10 to control the second pneumatic valve 10 to close, cut off the connection with the downstream, and protect the downstream equipment.

[0044] For more convenient operation, manual opening and closing commands can be set on the HMI to manually issue valve opening and closing commands to the first pneumatic valve 2 and the second pneumatic valve 10. At the same time, shielding and enabling switching buttons of relevant control instructions are set to control the entire process in multiple ways.

[0045] On the basis of the above implementation, in order to protect the metering system and the regulating system, the control command signal output by the PLC controller 11 is set as an ESD redundant signal. Since the ESD is a redundant setting, the PLC controller 11 needs to send redundant ESD, that is, when two ESD channels are triggered at the same time, the corresponding pneumatic valve executes the emergency shutdown command.

[0046] The metering control system in this embodiment can display the corrected flow value, the inlet pressure value, the outlet pressure value, and the current state of the pneumatic valve on the HMI screen. At the same time, the inlet pressure protection value and the outlet pressure protection value can be set. When the current pressure of the medium exceeds the protection value due to equipment failure or working environment, the relevant interlocking protection logic is executed, and the inlet or outlet or the inlet and outlet emergency cut-off valves with actuators are shut down urgently.

[0047] Furthermore, the first pressure transmitter 3 and the temperature transmitter 6 are configured to output two-wire active high-precision 4-20 mA signals, and the signal output ends of the first pressure transmitter 3 and the temperature transmitter 6 are connected to the IO channel of the flow computer 5 .

[0048] Furthermore, the flow transmitter 4 is connected to the serial communication channel of the flow computer 5 via the RS485 serial port.

[0049] Furthermore, the flow computer 5 transmits the flow signal to the PLC controller 11 via the RS485 serial port.

[0050] Furthermore, the first pneumatic valve 2 and the second pneumatic valve 10 both include an actuator, which is configured to receive a 24VDC direct current control command signal output by the PLC controller 11 and output a SPDT signal, and the actuator signal is connected to the I / O interface of the PLC controller 11.

[0051] Further, the temperature transmitter 6 is electrically connected to the PLC controller 11;

[0052] The inlet pressure transmitter 1, the outlet pressure transmitter 9 and the temperature transmitter 6 are configured to output two-wire active high-precision 4-20mA signals, and the signal output ends of the inlet pressure transmitter 1, the outlet pressure transmitter 9 and the temperature transmitter 6 are connected to the IO channel of the PLC controller 11.

[0053] Furthermore, the inlet pressure transmitter 1, the first pressure transmitter 3, the outlet pressure transmitter 9 and the temperature transmitter 6 are all provided with a local display module 12, and the local display module 12 is used to display the corresponding pressure values ​​and temperature values ​​for on-site observation.

[0054] In addition, it should be noted that both the first pressure transmitter 3 and the temperature transmitter 6 have HART protocol, which makes data transmission more accurate and stable.

[0055] In one embodiment, Figure 2 As shown, the metering control system further includes an input pipeline 13, a connecting pipeline 14 and an output pipeline 15, wherein the connecting pipeline 14 is provided in two groups and connected in parallel between the input pipeline 13 and the output pipeline 15;

[0056] The inlet pressure transmitter 1 and the first pneumatic valve 2 are arranged on the input pipeline 13, the outlet pressure transmitter 9 and the second pneumatic valve 10 are arranged on the output pipeline 15, the first pressure transmitter 3, the flow transmitter 4, the temperature transmitter 6, the self-operated cut-off valve 7, and the self-operated regulating valve 8 are arranged on the connecting pipeline 14.

[0057] In this embodiment, the two groups of connecting pipelines 14 are both provided with a first pressure transmitter 3, a flow transmitter 4, a temperature transmitter 6, a self-operated cut-off valve 7, and a self-operated regulating valve 8. In normal medium transport conditions, only one group of connecting pipelines 14 can be used, and the other group of connecting pipelines 14 can be closed by the self-operated cut-off valve 7. When a connecting pipeline 14 in use fails, the other connecting pipeline 14 can be opened for use. On the basis of providing two groups of connecting pipelines 14, in order to facilitate the collection of relevant parameters, two flow computers 5 can be provided, and the two flow computers 5 are respectively connected to the devices on the two groups of connecting pipelines 14.

[0058] The above description is only the preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Within the spirit and principle of the utility model, any modification, equivalent replacement, improvement, etc. made shall be included in the protection scope of the utility model.

Claims

1. A gas pressure regulating and metering control system with dual pneumatic cut-off protection, characterized in that: include: An inlet pressure transmitter, a first pneumatic valve, a first pressure transmitter, a flow transmitter, a temperature transmitter, a self-operated cut-off valve, a self-operated regulating valve, a second pneumatic valve and an outlet pressure transmitter connected in sequence; It also includes a flow computer, display module and PLC controller; The flow computer is electrically connected to the first pressure transmitter, the flow transmitter and the temperature transmitter; The PLC controller is electrically connected to the inlet pressure transmitter, the outlet pressure transmitter, the first pneumatic valve, the second pneumatic valve and the flow computer; The display module is electrically connected to the PLC controller.

2. The gas pressure regulating and metering control system according to claim 1, characterized in that: The first pressure transmitter and the temperature transmitter are configured to output two-wire active high-precision 4-20mA signals, and the signal output ends of the first pressure transmitter and the temperature transmitter are connected to the IO channel of the flow computer.

3. The gas pressure regulating and metering control system according to claim 2, characterized in that: The flow transmitter is connected to the serial communication channel of the flow computer via the RS485 serial port.

4. The gas pressure regulating and metering control system according to claim 3, characterized in that: The flow computer transmits the flow signal to the PLC controller via the RS485 serial port.

5. The gas pressure regulating and metering control system according to claim 4, characterized in that: The first pneumatic valve and the second pneumatic valve both include an actuator, and the actuator is configured to receive a 24VDC direct current control command signal output by the PLC controller and output an SPDT signal, and the actuator signal is connected to the PLC controller I / O interface.

6. The gas pressure regulating and metering control system according to claim 5, characterized in that: The control command signal output by the PLC controller is set to be an ESD redundant signal.

7. The gas pressure regulating and metering control system according to claim 1, characterized in that: The temperature transmitter is electrically connected to the PLC controller; The inlet pressure transmitter, the outlet pressure transmitter and the temperature transmitter are configured to output two-wire active high-precision 4-20mA signals, and the signal output ends of the inlet pressure transmitter, the outlet pressure transmitter and the temperature transmitter are connected to the IO channel of the PLC controller.

8. The gas pressure regulating and metering control system according to claim 1, characterized in that: The inlet pressure transmitter, the first pressure transmitter, the outlet pressure transmitter and the temperature transmitter are all configured with a local display module, and the local display module is used to display corresponding pressure values ​​and temperature values.

9. The gas pressure regulating and metering control system according to claim 1, characterized in that: The display module includes an HMI.

10. The gas pressure regulating and metering control system according to claim 1, characterized in that: It also includes an input pipeline, a connecting pipeline and an output pipeline, wherein the connecting pipeline is provided in two groups and connected in parallel between the input pipeline and the output pipeline; The inlet pressure transmitter and the first pneumatic valve are arranged on the input pipeline, the outlet pressure transmitter and the second pneumatic valve are arranged on the output pipeline, and the first pressure transmitter, flow transmitter, temperature transmitter, self-operated shut-off valve, and self-operated regulating valve are arranged on the connecting pipeline.

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