Monitoring system of CO2 storage tank

Abstract

A CO2 storage tank monitoring system disclosed by the present invention comprises a control platform, an industrial switch, a plurality of CO2 storage tanks and electric control cabinets in one-to-one correspondence with the CO2 storage tanks, monitoring devices are arranged in the CO2 storage tanks, the monitoring devices are electrically connected with the electric control cabinets, and the electric control cabinets are in communication connection with the control platform through the industrial switch. The monitoring device collects and transmits state parameters in the CO2 storage tank to the electric control cabinet, then the state parameters are uploaded to the control platform through the electric control cabinet, an operator can check state information in the CO2 storage tank according to the control platform, real-time monitoring of the CO2 storage tank is achieved, faults can be found in the first time, corresponding measures can be taken, and safety is improved. Besides, one control platform can be in communication connection with a plurality of electric control cabinets, intelligent control over a plurality of CO2 storage tanks is achieved, the labor intensity of operators is reduced, and the field working intensity and the safety risk are effectively reduced.

Description

Technical Field

[0001] The present invention relates to a control system, in particular to a monitoring system for a CO 2 tank container. Background Art

[0002] In the prior art, for the operation and monitoring of liquid CO 2 (carbon dioxide) storage tanks, most rely on manual on-site inspections and manual operations of valves and other mechanical operations. This not only consumes a large amount of human and time costs, but also, due to the uncertainty of human factors, it is easy to cause untimely and inaccurate data collection. In addition, when dangerous situations occur, such as abnormal pressure, over-limit liquid level, excessive temperature fluctuations or abnormal CO 2 concentration in the storage tank, it is difficult for the staff to detect and give an early warning in time. Once an accident occurs, it may cause serious casualties and property losses. Summary of the Invention

[0003] In order to overcome the deficiencies of the prior art, the present invention provides a monitoring system for a CO 2 storage tank.

[0004] The technical solution adopted by the present invention to solve its technical problems is: A monitoring system for a CO 2 storage tank, including a control platform, an industrial switch, several CO 2 storage tanks, and electrical control cabinets corresponding to the CO 2 storage tanks one by one. A monitoring device electrically connected to the electrical control cabinet is provided in the CO 2 storage tank. The electrical control cabinet includes a data acquisition unit, a control instruction unit, and a data translation unit. The input end of the data acquisition unit is connected to the monitoring device, and the output end of the data acquisition unit is connected to the data translation unit; the input end of the control instruction unit is connected to the data translation unit, and the output end of the control instruction unit is connected to the monitoring device; the data translation unit is communicatively connected to the control platform through the industrial switch.

[0005] The control platform includes a data display module and a system management module. The electrical control cabinet includes the modbus TCP protocol. The transmission end of the data translation unit is communicatively connected to the data display module through the modbus TCP protocol, and the receiving end of the data translation unit is communicatively connected to the system management module through the modbus TCP protocol.

[0006] The electrical control cabinet includes a power management module and a DC power supply module. The DC power supply module is divided into two paths, one path is electrically connected to the power management module, and the other path is electrically connected to the monitoring device.

[0007] The output terminals of the power management module are electrically connected to the data acquisition unit, the control instruction unit, and the data translation unit respectively.

[0008] The electric control cabinet includes a data backup module. The data backup module includes a backup of valve status information and a backup of control platform control instructions. The output terminal of the data translation unit is connected to the backup of valve status information and the backup of control platform control instructions respectively.

[0009] The monitoring device includes a liquid phase outlet valve, a nitrogen booster valve, a liquid level gauge, a pressure sensor, and a temperature sensor.

[0010] The control platform is provided with two control buttons: manual control and automatic control. Click on the start interface of the control platform, and a selection box for whether to be automatic will pop up. If "No" is selected, it will enter the manual control mode; if "Yes" is selected, it will enter the automatic control mode.

[0011] In the manual control mode, the operator can independently control the liquid phase outlet valve and the nitrogen booster valve.

[0012] In the automatic control mode, the monitoring device outputs the liquid level value, the pressure value, and the temperature value to the electric control cabinet in sequence. The electric control cabinet respectively judges whether the liquid level value, the pressure value, and the temperature value exceed the safe range. If the judgment result is yes, an alarm will be issued and the liquid phase outlet valve and the nitrogen booster valve will be closed; if the judgment result is no, no operation will be performed.

[0013] The electric control cabinet uploads the judgment result, the valve status information, and the information of the control platform control instructions to the data backup module.

[0014] The beneficial effects of the present invention are as follows: In the present invention, a monitoring device is provided in the CO 2 storage tank. The monitoring device is electrically connected to the electric control cabinet, and the electric control cabinet is communicatively connected to the control platform through an industrial switch. The monitoring device collects and transmits the state parameters in the CO 2 storage tank to the electric control cabinet, and then the electric control cabinet uploads them to the control platform. Operators can view the state information in the CO 2 storage tank according to the control platform, realizing real-time monitoring of the CO 2 storage tank, being able to discover faults in the first time and take corresponding measures, improving safety.

[0015] In addition, one control platform of the present invention can be communicatively connected to multiple electric control cabinets, realizing intelligent control of multiple CO 2 storage tanks, reducing the labor intensity of operators, and effectively reducing the on-site work intensity and safety risks. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below in conjunction with the drawings and embodiments.

[0017] Figure 1 is the block schematic diagram of the monitoring system of the present invention.

[0018] Figure 2 is the circuit block schematic diagram of the monitoring system of the present invention.

[0019] Figure 3 is the transportation logic diagram of the monitoring system of the present invention. Detailed implementation manners

[0020] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with the detailed implementation manners and with reference to the accompanying drawings. It should be noted that, without conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0021] It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention.

[0022] The following describes some embodiments of the present invention provided in conjunction with the accompanying drawings.

[0023] Refer to Figure 1 and Figure 2 , a monitoring system for a CO 2 storage tank, including a control platform 1, an industrial switch 2, a plurality of CO 2 storage tanks 3, and an electric control cabinet 4 corresponding to each CO 2 storage tank 3 one by one. A monitoring device 5 electrically connected to the electric control cabinet 4 is arranged in the CO 2 storage tank 3. The electric control cabinet 4 includes a data acquisition unit 41, a control instruction unit 42, and a data translation unit 43. The input end of the data acquisition unit 41 is connected to the monitoring device 5, and the output end of the data acquisition unit 41 is connected to the data translation unit 43; the input end of the control instruction unit 42 is connected to the data translation unit 43, and the output end of the control instruction unit 42 is connected to the monitoring device 5; the data translation unit 43 is communicatively connected to the control platform 1 through the industrial switch 2. In the present invention, the monitoring device 5 collects and transmits the state parameters in the CO 2 storage tank 3 to the electric control cabinet 4, and then the electric control cabinet 4 uploads them to the control platform 1. Operators can view the state information in the CO 2 storage tank 3 according to the control platform 1, realizing real-time monitoring of the CO 2 storage tank 3, being able to discover faults in the first time and take corresponding measures, improving safety. In addition, one control platform 1 in the present invention can be communicatively connected to multiple electric control cabinets 4, realizing intelligent control of multiple CO 2 storage tanks 3, reducing the labor intensity of operators, and effectively reducing the on-site working intensity and safety risks.

[0024] In this embodiment, the control platform 1 uses an industrial tablet computer of HuShida, with the operating system being the win10 system. Specifically, a three-proof and reinforced tablet computer of HuShida is selected, with a 10.1-inch large screen, 10-point touch control, an IP65 protection level, a resolution of 1920×1200. The tablet computer is equipped with a Celeron N5100 quad-core processor, 8G of memory, and a 256G storage disk, which can meet the control requirements of the system. The industrial switch 2 selects the MOXA 16-port industrial switch EDS-316, which can meet the needs of connecting multiple electrical control cabinets. The electrical control cabinet 4 selects the PLC of the Siemens S7-200SMART series. This series of PLCs can expand communication ports, digital quantity channels, and analog quantity channels, and can be precisely customized to improve the product utilization rate. The PLC is equipped with a standard Ethernet interface and supports multiple industrial Ethernet communication protocols such as PROFINET, TCP, UDP, and Modbus TCP.

[0025] As a further improvement of the present invention, the monitoring device 5 includes a liquid phase outlet valve 51, a nitrogen booster valve 52, a liquid level gauge 53, a pressure sensor 54, and a temperature sensor 55. The electrical control cabinet 4 collects data and converts the collected analog quantity values to obtain actual values such as pressure and liquid level. Among them, the liquid phase outlet valve 51 and the nitrogen booster valve 52 collect valve state and opening information, and the opening and closing of the liquid phase outlet valve 51 and the nitrogen booster valve 52 and the automatic control of the opening are performed through the control instruction unit 42.

[0026] As a further improvement of the present invention, the control platform 1 includes a data display module 11 and a system management module 12. The electrical control cabinet 4 includes a modbus TCP protocol 44. The transmission end of the data translation unit 43 is communicatively connected to the data display module 11 through the modbus TCP protocol 44, and the receiving end of the data translation unit 43 is communicatively connected to the system management module 12 through the modbus TCP protocol 44. In this embodiment, the electrical control cabinet 4 and the control platform 1 communicate through an industrial switch and an RJ45 network cable. The modbus TCP protocol 44 is set in the electrical control cabinet 4. That is to say, the modbus TCP protocol 44 of the electrical control cabinet 4 is connected to the industrial switch 2 through an RJ45 network cable, and the industrial switch 2 is connected to the control platform 1 through an RJ45 network cable, making the communication of the monitoring system more convenient. In this embodiment, one industrial switch 2 corresponds to one control platform 1, and one industrial switch 2 can communicate with multiple electrical control cabinets 4, so that communication between one control platform 1 and multiple electrical control cabinets 4 can be realized, and intelligent control of multiple CO 2 storage tanks 3 can be achieved.

[0027] In this embodiment, the electric control cabinet 4 includes a power management module 45 and a DC power supply module 46. The DC power supply module 46 is divided into two paths. One path is electrically connected to the power management module 45, and the other path is electrically connected to the monitoring device 5. The output end of the power management module 45 is respectively electrically connected to a data acquisition unit 41, a control instruction unit 42, and a data translation unit 43. The DC power supply module 46 outputs a DC voltage of 24V, and the power management module 45 converts the DC voltage of 24V into a low voltage that can be used by the data acquisition unit 41, the control instruction unit 42, and the data translation unit 43, facilitating power supply to the devices.

[0028] As a further improvement of the present invention, the electric control cabinet 4 includes a data backup module 47. The data backup module 47 includes a valve status information backup 48 and a control platform control instruction backup 49. The output end of the data translation unit 43 is respectively connected to the valve status information backup 48 and the control platform control instruction backup 49. Record the parameter information of the CO 2 storage tank, valve status information, and control platform control instruction information for convenient subsequent traceability and management analysis.

[0029] Refer to Figure 3 , Figure 3 is the transportation logic diagram of a monitoring system given by the present invention. In the present invention, the control platform 1 is provided with two control modes: manual control and automatic control. Specifically, click on the start interface of the control platform 1, and a selection box for whether to be automatic pops up. Select "No", then enter the manual control mode; select "Yes", then enter the automatic control mode. The operator can freely select the control mode, which is convenient to use.

[0030] In this embodiment, in the manual control mode, the operator can separately control the liquid phase outlet valve 51 and the nitrogen booster valve 52. For example, when separately detecting or repairing the liquid phase outlet valve 51 and the nitrogen booster valve 52, power supply or operation can be directly stopped for them, thus facilitating maintenance more conveniently.

[0031] In this embodiment, in the automatic control mode, the liquid level gauge 53, the pressure sensor 54, and the temperature sensor 55 automatically detect the parameters of the CO 2 storage tank, and then transmit the detected parameters to the electric control cabinet 4. The electric control cabinet 4 analyzes and judges these parameters and feeds them back to the control platform 1. Specifically, the liquid level gauge 53 is used to detect the CO 2The liquid level value inside the storage tank. The liquid level gauge 53 can be an optical fiber sensor. The working principle of the optical fiber sensor is that light emitted by a light source passes through an optical fiber and enters a modulator. After the parameter to be measured interacts with the light entering the modulation region, it causes changes in the optical properties of the light, including changes in light intensity, wavelength, frequency, phase, polarization state, etc. Then, it passes through the optical fiber and enters an optical detector. After demodulation, the measured parameter is obtained. The measured parameter is transmitted back to the data acquisition unit 41, and the data acquisition unit 41 transmits the data to the data translation unit 43. The data translation unit 43 compares whether it exceeds the preset value range. If it exceeds the range, a control signal is sent to the control instruction unit 42, thereby closing the liquid phase outlet valve 51 and the nitrogen boosting valve 52. Finally, the data translation unit 43 respectively sends the parameter information and the valve status information to the data backup module 47 and the modbus TCP protocol 44, facilitating the operator to view the situation. If it does not exceed the preset range, the data translation unit 43 does not send a control signal to the control instruction unit 42 and directly sends the parameter information to the data backup module 47 and the modbus TCP protocol 44. Among them, CO 2 The liquid level of the storage tank is generally controlled within 10% - 90% of the storage tank volume. If the liquid level is too low, it may cause instability of the pressure inside the tank; while if the liquid level is too high, when the temperature rises, the liquid expansion may cause the pressure to rise sharply, exceeding the safety limit. The present invention can monitor the CO 2 liquid level of the storage tank in real time, improving the CO 2 safety of the storage tank.

[0032] The pressure sensor 54 is used to detect the CO 2 pressure value inside the storage tank. The pressure value is transmitted back to the data acquisition unit 41, and the data acquisition unit 41 transmits the data to the data translation unit 43. The data translation unit 43 compares whether it exceeds the preset value range. If it exceeds the range, a control signal is sent to the control instruction unit 42, thereby closing the liquid phase outlet valve 51 and the nitrogen boosting valve 52. Finally, the data translation unit 43 respectively sends the parameter information and the valve status information to the data backup module 47 and the modbus TCP protocol 44, facilitating the operator to view the situation. If it does not exceed the preset range, the data translation unit 43 does not send a control signal to the control instruction unit 42 and directly sends the parameter information to the data backup module 47 and the modbus TCP protocol 44. Among them, CO 2The storage tank can be used to store low-temperature liquid carbon dioxide. Generally, the storage temperature is around -20°C, and its pressure usually ranges from 1.9 MPa to 2.2 MPa. This is because at low temperatures, carbon dioxide is in a liquid state, and this pressure range helps to maintain the liquid state of carbon dioxide. When the pressure is lower than 1.9 MPa, flash evaporation may occur to the liquid carbon dioxide, that is, part of the liquid carbon dioxide vaporizes rapidly; when the pressure is higher than 2.2 MPa, the risk of safety accidents such as the rupture of the storage tank will increase. Through the electric control cabinet, the pressure of the CO 2 storage tank can be monitored in real time, improving the safety of the CO 2 storage tank.

[0033] The temperature sensor 55 is used to detect the temperature value inside the CO 2 storage tank. The temperature value is sent back to the data acquisition unit 41. The data acquisition unit 41 transmits the data to the data translation unit 43. The data translation unit 43 compares whether it exceeds the preset value range. If it exceeds the range, a control signal is sent to the control instruction unit 42, thereby closing the liquid phase outlet valve 51 and the nitrogen booster valve 52. Finally, the data translation unit 43 sends parameter information and valve status information to the data backup module 47 and the modbus TCP protocol 44 respectively, facilitating the operator to view the situation; if it does not exceed the preset range, the data translation unit 43 does not send a control signal to the control instruction unit 42 and directly sends parameter information to the data backup module 47 and the modbus TCP protocol 44. Among them, the CO 2 storage tank can be used to store low-temperature liquid carbon dioxide, and the temperature is generally maintained between -20°C and -30°C. When the temperature approaches -20°C, the saturated vapor pressure of the liquid carbon dioxide is relatively low, which helps to reduce the vaporization of carbon dioxide. If the temperature rises, the saturated vapor pressure of carbon dioxide will increase, resulting in easier vaporization of the liquid carbon dioxide, thus affecting the pressure balance inside the storage tank. When the temperature is lower than -30°C, although carbon dioxide is still in a liquid state, it will increase the energy consumption of the refrigeration system. Because to maintain a lower temperature, the refrigeration equipment needs to consume more energy. At the same time, too low a temperature may affect the material properties of the storage tank, such as making the storage tank material brittle and increasing the risk of rupture of the storage tank. Through the electric control cabinet, the temperature of the CO 2 storage tank can be monitored in real time, improving the safety of the CO 2 storage tank.

[0034] The above embodiments cannot limit the protection scope of the present invention. Those skilled in the professional technical field, without departing from the overall concept of the present invention, the equivalent modifications and changes made still fall within the scope covered by the present invention.

Claims

1. A monitoring system for a CO2 storage tank, characterized in that: The invention comprises a control platform (1), an industrial switch (2), a plurality of CO2 storage tanks (3), and an electric control cabinet (4) corresponding to each of the CO2 storage tanks (3). A monitoring device (5) electrically connected to the electric control cabinet (4) is arranged in the CO2 storage tank (3). The electric control cabinet (4) comprises a data acquisition unit (41), a control instruction unit (42), and a data translation unit (43). The input end of the data acquisition unit (41) is connected to the monitoring device (5), and the output end of the data acquisition unit (41) is connected to the data translation unit (43); the input end of the control instruction unit (42) is connected to the data translation unit (43), and the output end of the control instruction unit (42) is connected to the monitoring device (5); and the data translation unit (43) is connected to the control platform (1) through the industrial switch (2).

2. The monitoring system for the CO2 storage tank according to claim 1 is characterized in that The control platform (1) comprises a data display module (11) and a system management module (12); the electric control cabinet (4) comprises a modbus TCP protocol (44); a transmission end of the data translation unit (43) is communicatively connected to the data display module (11) via the modbus TCP protocol (44); and a receiving end of the data translation unit (43) is communicatively connected to the system management module (12) via the modbus TCP protocol (44).

3. The monitoring system for the CO2 storage tank according to claim 2 is characterized in that The electric control cabinet (4) comprises a power management module (45) and a direct current power supply module (46); the direct current power supply module (46) is divided into two paths, one path being electrically connected to the power management module (45) and the other path being electrically connected to the monitoring device (5).

4. The monitoring system for the CO2 storage tank according to claim 3 is characterized in that The output end of the power management module (45) is electrically connected to the data acquisition unit (41), the control instruction unit (42) and the data translation unit (43) respectively.

5. The monitoring system for the CO2 storage tank according to claim 4 is characterized in that The electric control cabinet (4) comprises a data backup module (47), the data backup module (47) comprises a valve status information backup (48) and a control platform control instruction backup (49), and the output end of the data translation unit (43) is respectively connected to the valve status information backup (48) and the control platform control instruction backup (49).

6. The monitoring system for the CO2 storage tank according to claim 1 is characterized in that The monitoring device (5) comprises a liquid phase outlet valve (51), a nitrogen boost valve (52), a liquid level meter (53), a pressure sensor (54), and a temperature sensor (55).

7. The monitoring system for a CO2 storage tank according to claim 6, characterized in that The control platform (1) is provided with two control buttons, manual control and automatic control. When the start interface of the control platform (1) is clicked, a selection box for whether to automatically start or not pops up. If "no" is selected, the manual control mode is entered. If "yes" is selected, the automatic control mode is entered.

8. The monitoring system for a CO2 storage tank according to claim 7, characterized in that: In the manual control mode, the operator can independently control the liquid phase outlet valve (51) and the nitrogen boost valve (52).

9. The monitoring system for a CO2 storage tank according to claim 7, characterized in that: In the automatic control mode, the monitoring device (5) sequentially outputs the liquid level value, the pressure value and the temperature value to the electric control cabinet (4), and the electric control cabinet (4) judges whether the liquid level value, the pressure value and the temperature value exceed the safety range respectively. If the judgment result is yes, an alarm is issued and the liquid phase outlet valve (51) and the nitrogen boost valve (52) are closed; if the judgment result is no, no operation is performed.

10. The monitoring system for CO2 storage tank according to claim 9, characterized in that The electric control cabinet (4) uploads the judgment result, valve status information and information of the control command of the control platform (1) to the data backup module (47).

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