LNG test platform and intelligent control system

Abstract

The invention discloses an LNG (liquefied natural gas) test platform and an intelligent control system, which use a PLC (programmable logic controller) and an industrial personal computer to control the operation of a gas station, monitor and process various data in real time and improve the working efficiency and safety of the gas station, and the system mainly comprises the PLC, the industrial personal computer, a frequency converter, a soft starter and various instruments, the PLC is used for controlling various devices of the gas station, such as a liquid adding pump, a flow meter and a pressure sensor, and the industrial personal computer is responsible for collecting and processing various data including pressure, flow, temperature, liquid level and the like, so that comprehensive control over the gas station is achieved, and the working efficiency and safety of the gas station are improved.

Description

Technical Field

[0001] The invention relates to a LNG filling station test program, in particular to an LNG test platform and an intelligent control system. Background Art

[0002] Liquefied natural gas (LNG) is a kind of clean energy with high energy efficiency and low pollution. It is widely used in the modern energy field. With the continuous construction and use of LNG filling stations, the requirements for their operation and management are getting higher and higher. Since LNG filling stations need to adopt a series of control and monitoring equipment to ensure the stability and safety of LNG gas supply, the software development of LNG filling stations is a crucial link. Summary of the invention

[0003] The purpose of the present invention is to provide an LNG testing platform and an intelligent control system to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions: An LNG test platform and intelligent control system, an industrial computer and a PLC, a frequency converter are connected through a network cable, a soft starter is connected through the PLC through Modbus, a gas leak detection and the PLC are connected through Modbus, various instruments and the PLC are connected through analog 4-20mA signals, and an indicator light and the PLC are connected through a digital output signal.

[0005] Compared with the prior art, the present invention has the following beneficial effects: The PLC program control is used to fully monitor and record the operation status of the LNG filling station, and the optimized design is carried out to improve the smooth operation and maintenance convenience of the LNG filling station, and further improve the operational safety of the LNG filling station. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 A schematic diagram of the core control components for the development of an LNG test platform and intelligent control software.

[0007] Figure 2 This is a schematic diagram of the connection of an LNG test platform system.

[0008] Figure 3 The figure is a schematic diagram of data interaction between an LNG test platform and an intelligent control system and a gas dispenser.

[0009] Figure 4 This is a wiring diagram of an LNG test platform, an intelligent control system and various instruments.

[0010] Figure 5It is a schematic diagram of the alarm action process of an LNG test platform and intelligent control system. DETAILED DESCRIPTION

[0011] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the 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.

[0012] See also Figures 1 to 5 In an embodiment of the present invention, an LNG test platform and an intelligent control system include an industrial computer 1, a PLC 2, a frequency converter 3, a soft starter 4, a gas leak detector 5, various instruments 6 and an indicator light 7.

[0013] The industrial computer 1 and PLC2, the frequency converter 3 are connected through a network cable, the soft starter 4 is connected through Modbus via PLC2, the gas leak detector 5 is connected to PLC2 through Modbus, various instruments 6 are connected to PLC2 through analog 4-20mA signals, and the indicator light 7 is connected to PLC2 through digital output signals.

[0014] PLC2 reads the filling data and flow data on the gas filling machine in real time through Modbus, collects the current status of the gas filling machine in real time and makes corresponding action instructions through PLC2, including closing the gas filling machine return valve in standby state, and controlling the frequency converter 3 through PLC2 to operate the gas filling pump in the filling state.

[0015] PLC2 is connected to various instruments 6 through analog 4-20mA signals. The collected data is judged in PLC2. If the corresponding instrument value is higher or lower than the set normal value, a reminder will be given for 20 seconds. If the data collected by the instrument continues to not meet the set value conditions after 20 seconds, an alarm shutdown will be executed. At this time, the industrial computer 1 will display the accurate alarm point and remind the operator to manually intervene to maintain the equipment until the abnormal alarm state is eliminated.

[0016] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An LNG test platform and intelligent control system, comprising an industrial computer (1), a PLC (2), a frequency converter (3), a soft starter (4), a gas leak detector (5), various instruments (6), and an indicator light (7), characterized in that: The industrial computer (1) and PLC (2) and the frequency converter (3) are connected via a network cable, the soft starter (4) is connected via Modbus via PLC (2), the gas leak detector (5) is connected via Modbus to PLC (2), various instruments (6) are connected via analog 4-20mA signals to PLC (2), and the indicator light (7) is connected via digital output signals to PLC (2).

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