CN215895293U - Automatic control system of LNG station - Google Patents
Automatic control system of LNG station Download PDFInfo
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- CN215895293U CN215895293U CN202121613084.8U CN202121613084U CN215895293U CN 215895293 U CN215895293 U CN 215895293U CN 202121613084 U CN202121613084 U CN 202121613084U CN 215895293 U CN215895293 U CN 215895293U
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Abstract
The utility model discloses an automatic control system of an LNG station, which comprises a control cabinet, wherein the control cabinet is respectively and electrically connected with a data acquisition instrument in an input mode, the control cabinet is respectively and electrically connected with a touch screen and an alarm controller in an output mode, the alarm controller is electrically connected with an alarm probe, the control cabinet also comprises a PLC system, the PLC system is communicated with an operator station and a dispatching center through a network communication port, and an HMI (human machine interface), the dispatching center and a router of the operator station are connected with an industrial switch through network cables. The automatic control system of the LNG station is connected with each data acquisition instrument, the alarm system and the PLC system by adopting the control cabinet, can realize the acquisition of on-site pipe network pressure, gas leakage and flow signals, can perform manual open-loop control after remote monitoring personnel confirm abnormity after receiving combustible gas concentration alarm and set pressure, temperature, flow and other parameter overrun alarm prompts, and can perform remote manual open-loop emergency control after an abnormal system cannot be automatically controlled.
Description
Technical Field
The utility model relates to the field of control systems, in particular to an automatic control system of an LNG station.
Background
LNG becomes a main gas source or a transitional gas source of a city which can not use the pipe-line natural gas for gas supply at present, and is also a supplementary gas source or a peak shaving gas source of a plurality of cities which use the pipe-line natural gas for gas supply. An LNG vaporization station is a satellite station that receives, stores and distributes LNG and is also an intermediate conditioning site for towns or gas companies to transfer LNG from a manufacturer to customers. By virtue of the advantages of short construction period and capability of rapidly meeting the demand of a gas utilization market, the LNG gasification station is gradually built in a plurality of economically developed and energy-scarce middle and small cities in the south-east coast of China, and becomes a permanent gas supply facility or a transitional gas supply facility before arrival of pipeline natural gas. Currently, some LNG station control systems are far away from the construction age, and along with the increase of service life, the hardware of the station control system is aged, software runs slowly, and faults and unknown errors occur frequently, so that the current production requirements cannot be met.
SUMMERY OF THE UTILITY MODEL
The utility model aims to design an automatic control system of an LNG station to solve the problems in the background technology.
In order to achieve the purpose, the utility model provides the following technical scheme:
the automatic control system of the LNG station comprises a control cabinet, wherein the control cabinet is respectively and electrically connected with a pressure transmitter, a differential pressure transmitter, a temperature transmitter, a stop valve, an electric ball valve and a turbine flowmeter, the control cabinet is respectively and electrically connected with a touch screen and an alarm controller, the alarm controller is electrically connected with an alarm probe used for monitoring the concentration of combustible gas, the control cabinet is provided with a PLC system, the PLC system is communicated with an operator station and a dispatching center through a network communication port, and the HM I of the operator station, the dispatching center and a router are connected with an industrial switch through a network cable.
Further, the PLC system selects Siemens PLC1500 series products, the PLC system provides more than 1 RJ45 Ethernet communication port and more than 2 RS485 serial communication ports, the serial communication ports can perform asynchronous and synchronous transmission, the transmission and receiving speed is greater than or equal to 9600bps, and the serial communication ports and the turbine flowmeter realize 1:1 or 1:2 configuration.
Further, the turbine flowmeter is communicated with the PLC system in a 485 serial communication mode.
Further, the isolation voltage of the industrial switch is more than 1500V, and at least 2 network ports are reserved.
Further, the PLC system is provided with an explosion-proof box, and the shell of the explosion-proof box is kept in a grounding state.
Further, the control cabinet is powered by the UPS power supply.
The utility model has the beneficial effects that: compared with the prior art, the automatic control system of the LNG station adopts the control cabinet to be connected with the pressure transmitter, the differential pressure transmitter, the temperature transmitter, the stop valve, the electric ball valve, the turbine flowmeter, the alarm system for monitoring the concentration of the combustible gas and the PLC system, so that the acquisition of on-site pipe network pressure, gas leakage and flow signals can be realized, after receiving the alarm of the concentration of the combustible gas and the alarm prompt for setting the overrun of parameters such as pressure, temperature, flow and the like, a remote monitoring person can carry out manual open-loop control after confirming the abnormity, and after the abnormal system cannot be automatically controlled, the remote manual open-loop emergency control can be carried out.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural view of an autonomous system of an LNG station according to the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the description is only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
Referring to fig. 1, the automatic control system of the LNG station of the present invention includes a control cabinet, the control cabinet is electrically connected to a pressure transmitter, a differential pressure transmitter, a temperature transmitter, a trip valve, an electric ball valve, and a turbine flowmeter, the control cabinet is electrically connected to a touch screen and an alarm controller, the alarm controller is electrically connected to an alarm probe for monitoring the concentration of combustible gas, the control cabinet is provided with a PLC system, the PLC system communicates with an operator station and a dispatch center through a network communication port, and an HMI of the operator station, the dispatch center, and a router are connected to an industrial switch through a network. In this embodiment, the control box chooses the external installation type as required for use, and the touch-sensitive screen that is used for on-the-spot monitored control system adopts the siemens touch-sensitive screen. The touch screen has the main functions of displaying field production data in real time, monitoring and alarming abnormal conditions, displaying field production processes, remotely controlling equipment and adding PLC data into a system of a dispatching center. The metal parts inside the control cabinet are in contact with each other with as large an area as possible to ensure electrical conductivity and avoid mutual connection through painted parts. The grounding end is used in the control cabinet and is connected with the control cabinet door through a connecting wire, and the connecting wire is short and thick. The instrument wiring of the control cabinet and the data acquisition meter adopts an explosion-proof flexible pipe, and a galvanized pipe is used for protecting a signal wire.
The PLC system selects Siemens PLC1500 series products, more than 1 RJ45 Ethernet communication port and more than 2 RS485 serial communication ports can be provided, the serial communication ports can carry out asynchronous and synchronous transmission, the transmission and receiving speed is more than or equal to 9600bps, and the serial communication ports and the turbine flowmeter realize 1:1 or 1:2 configuration. According to the I/O point statistical table and the system requirements, the I/O point quantity is reserved according to the allowance of more than 20%, and the PLC selects Siemens PLC1500 series products to ensure the reliability and stability of the system. The PLC system is provided with the explosion-proof box, a network cable and a signal cable entering the box body adopt explosion-proof interference tubes with explosion-proof grades meeting relevant regulations of GB 4208 and 2008, and the good grounding of the shell of the explosion-proof box is ensured. In addition, a signal lightning protector is added to the analog quantity signal, the switching value signal and the RS485 communication line on the site. Meanwhile, reliable grounding of all lightning protection devices is guaranteed, a PLC equipment cabinet adopts a BV-10mm2 copper wire grounding wire to be connected to a grounding collection ring, and the BV-6mm2 copper wire is adopted by the grounding wire of the analog quantity, switching quantity and RS485 signal surge protector to be connected with the grounding collection ring, so that the length of the grounding collection ring is not more than 1 meter, and the influence of inductive lightning and sudden signal change on a system can be effectively prevented.
The turbine flowmeter is communicated with the PLC system in a 485 serial communication mode. In addition, this autonomous system of LNG station still includes the PLC cabinet, and PLC cabinet safety end inserts communication isolation safety bars and surge protector. The safety grid has the main functions of limiting current and limiting voltage, and the energy available for the data acquisition instrument is ensured to be within a safety range. When spike current or voltage is suddenly generated in an electric loop or a communication line of an automatic control system of the LNG station due to external interference, the surge protector can conduct and shunt in a very short time, so that damage of surge to other equipment in the loop is avoided.
The isolation voltage of the industrial switch is more than 1500V and at least 2 net ports are reserved. The industrial switch in the embodiment meets the requirements of physical port isolation and network dual redundancy and ensures that the distance between the ports is less than 50 m. If it is larger than 50m, the relay is increased or the communication transmission rate is decreased according to the specification of the port.
The control cabinet is powered by the UPS, the UPS is provided with the explosion-proof box, and the shell of the explosion-proof box is kept in a grounding state. Because the control cabinet has higher requirements on the stability of the power supply, an uninterrupted power supply needs to be provided, and the UPS power supply is made of a brand of easy-to-go, 3KVA and is online for 4 hours.
The control cabinet is provided with an audible and visual alarm. The switch board is installed in explosive gas environment place, and audible and visual alarm is used for detecting the leakage condition in indoor outer dangerous place, guarantees production and personal safety.
The automatic control system of the LNG station further comprises an upper computer, and the PLC cabinet and the upper computer are arranged in an explosion-proof safety area. The host computer in this embodiment has the giga transmission rate, communicates through the network between PLC system and the host computer, and other equipment in field station need RS485 communication, adopts PLC port one-to-one communication, then the network upload host computer.
The working principle of the embodiment is as follows: the LNG station selects a stable and reliable S7-1500 series PLC of German Siemens company as a main control module, an upper computer, a UPS power supply, a switch, a surge protector, a safety barrier and the like are configured, signals of field flow, pressure, temperature, a combustible gas probe and the like are collected in real time, the end station transmits the signals in an Ethernet/wireless mode, and data are sent to a dispatching center for processing and displaying.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (6)
1. The utility model provides a self-control system of LNG station, includes the switch board, its characterized in that: the control cabinet is respectively and electrically connected with the pressure transmitter, the differential pressure transmitter, the temperature transmitter, the stop valve, the electric ball valve and the turbine flowmeter, the control cabinet is respectively and electrically connected with the touch screen and the alarm controller in an output mode, the alarm controller is electrically connected with the alarm probe for monitoring the concentration of combustible gas, the control cabinet is provided with a PLC system, the PLC system is communicated with the operator station and the dispatching center through a network communication port, and the HMI of the operator station, the dispatching center and the router are connected with the industrial switch through network cables.
2. The autonomous system of an LNG plant of claim 1 wherein: the PLC system selects Siemens PLC1500 series products, the PLC system provides more than 1 RJ45 Ethernet communication port and more than 2 RS485 serial communication ports, the serial communication ports can carry out asynchronous and synchronous transmission, the transmission and receiving speed is more than or equal to 9600bps, and the serial communication ports and the turbine flowmeter realize 1:1 or 1:2 configuration.
3. The autonomous system of an LNG plant of claim 1 wherein: the turbine flowmeter is communicated with the PLC system in a 485 serial communication mode.
4. The autonomous system of an LNG plant of claim 1 wherein: the isolation voltage of the industrial switch is more than 1500V, and at least 2 network ports are reserved.
5. The autonomous system of an LNG plant of claim 1 wherein: the PLC system is provided with an explosion-proof box, and the shell of the explosion-proof box is kept in a grounding state.
6. The autonomous system of an LNG plant of claim 1 wherein: the control cabinet is powered by the UPS power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121613084.8U CN215895293U (en) | 2021-07-15 | 2021-07-15 | Automatic control system of LNG station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121613084.8U CN215895293U (en) | 2021-07-15 | 2021-07-15 | Automatic control system of LNG station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215895293U true CN215895293U (en) | 2022-02-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121613084.8U Active CN215895293U (en) | 2021-07-15 | 2021-07-15 | Automatic control system of LNG station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215895293U (en) |
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2021
- 2021-07-15 CN CN202121613084.8U patent/CN215895293U/en active Active
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