CN217356498U - Natural gas hydrogen-loading pipeline control system based on PLC - Google Patents
Natural gas hydrogen-loading pipeline control system based on PLC Download PDFInfo
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- CN217356498U CN217356498U CN202220933590.3U CN202220933590U CN217356498U CN 217356498 U CN217356498 U CN 217356498U CN 202220933590 U CN202220933590 U CN 202220933590U CN 217356498 U CN217356498 U CN 217356498U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
- Y02P90/45—Hydrogen technologies in production processes
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Abstract
The utility model discloses a natural gas hydrogen-doped pipeline control system based on PLC aims at solving the difficult accurate control of natural gas line hydrogen-doped proportion and the not enough technical problem of fail safe nature, include: the system comprises a PLC module, a control terminal, a sensor module and an action module; the control terminal, the sensor module and the action module are respectively and electrically connected with the PLC module; the sensor module comprises a hydrogen purity transmitter for being arranged in the mixed gas pipeline; the action module comprises a pressure regulating valve arranged on the upstream of the hydrogen supply pipeline. The utility model discloses can be according to the accurate control natural gas loading proportion of the actual condition of loading, the reliability is high, and can the automatic monitoring pipeline, auto-stop, diffuse under not complying with the loading requirement or emergency.
Description
Technical Field
The utility model relates to an energy technical field, concretely relates to natural gas hydrogen-mixing pipeline control system based on PLC.
Background
The hydrogen energy is used as clean energy for storage, power generation and combustion, and is a major strategic direction for energy transformation of various countries. Natural gas and hydrogen belong to the same gas energy carrier, and the physical properties of the natural gas and the hydrogen have certain similarity. The infrastructure of natural gas compression, storage, pipeline, combustion facilities, etc. has certain adaptability to hydrogen. The existing natural gas pipe network can be considered to be doped with hydrogen for conveying, and the hydrogen is conveyed to a terminal for separation or direct combustion, so that the hydrogen conveying cost is reduced, the combustion characteristic can be improved after the natural gas is doped with the hydrogen, the greenhouse gas emission is reduced, and the method is one of important ways for promoting the large-scale popularization of the hydrogen energy industry.
After the natural gas pipeline is doped with hydrogen, the property of pipeline transportation gas is changed, and the addition of the hydrogen can cause safety problems in the aspect of pipes, such as hydrogen embrittlement, hydrogen induced cracking and other hydrogen damages. For a natural gas pipeline with hydrogen, the applicable hydrogen loading proportion of each part of the natural gas pipeline is greatly different. The acceptable hydrogen loading proportion of pipe network equipment such as a compressor and the like is the minimum, and is about 10 percent; the hydrogen-loading proportion which can be accepted by the pipeline varies with different steel grades, and the approximate range is between 30% and 50%; the allowable hydrogen loading ratio of the safety accident is about 24 percent. Therefore, for safety reasons, the loading ratio of natural gas is strictly limited, and different loading ratios are required by different pipeline equipment, so that a loading system with good adaptability and high reliability is required.
The patent document with publication number CN112728410A discloses a method and device for accurately controlling the hydrogen-loading ratio of natural gas, which realizes real-time control of the hydrogen-loading ratio, collects the natural gas flow and hydrogen flow in the pipeline, and controls the flow after calculating the flow ratio by a control system, so as to achieve the purpose of controlling the hydrogen-loading ratio of natural gas. However, the inventor of the present application found in experimental studies that such a method can only achieve accuracy theoretically, for example, when the hydrogen pressure is greater than the natural gas pressure, hydrogen may flow back into the natural gas pipeline, which affects the metering of the natural gas flowmeter and further affects the hydrogen loading ratio.
Therefore, there is a need to develop and design a natural gas loading system with good loading control effect and safety and reliability.
Disclosure of Invention
An object of the utility model is to provide a natural gas loading pipeline control system based on PLC aims at solving the difficult accurate control of natural gas line loading proportion and the not enough technical problem of fail safe nature.
In order to solve the technical problem, the utility model adopts the following technical scheme:
a natural gas loading pipeline control pipeline system is designed, and comprises: the system comprises a PLC module, a control terminal, a sensor module and an action module; the control terminal, the sensor module and the action module are respectively and electrically connected with the PLC module; the sensor module comprises a hydrogen purity transmitter arranged in the mixed gas pipeline; the action module comprises a pressure regulating valve arranged on the upstream of the hydrogen supply pipeline.
Further, the PLC module includes: the device comprises a PLC, an analog input unit and an analog output unit; the analog input unit and the analog output unit are respectively connected with the PLC through buses.
Further, the control terminal comprises a touch screen, an emergency stop button, a start button and a stop button; the touch screen is in communication connection with the PLC, and the emergency stop button, the start button and the stop button are respectively and correspondingly electrically connected with the I/O of the PLC.
Further, the action module further comprises: a hydrogen flow regulating valve and a natural gas flow regulating valve which are respectively used for being arranged in a hydrogen supply pipeline provided with a first check valve and a natural gas supply pipeline provided with a second check valve, and a bleeding electromagnetic valve which is arranged in a bleeding pipeline.
Further, the sensor module further includes: when the device is used, the pressure transmitter and the temperature transmitter are respectively arranged in the hydrogen supply pipeline, the natural gas supply pipeline, the mixing mechanism and the mixed gas pipeline in pairs, and the hydrogen flowmeter and the natural gas flowmeter are respectively arranged at the upstream of the check valves in the hydrogen supply pipeline and the natural gas supply pipeline.
Compared with the prior art, the utility model discloses a main beneficial technological effect lies in:
1. the utility model discloses can be according to the accurate control natural gas proportion of mixing hydrogen of the actual condition of mixing hydrogen, the reliability is high.
2. The utility model can automatically monitor the pipeline, and can automatically stop and diffuse when the pipeline is not in accordance with the hydrogen-loading requirement or emergency.
Drawings
Fig. 1 is a schematic diagram of module connection according to the present invention.
Fig. 2 is a schematic structural diagram of the present invention in the embodiment.
FIG. 3 is a flow chart of the present invention for hydrogen loading.
In the above drawings, 1 is an operation panel, 10 is a touch panel, 11 is a start button, 12 is a stop button, 13 is an emergency stop button, 2 is a sensor module, 20 is a pressure transmitter, 21 is a temperature transmitter, 22 is a hydrogen purity transmitter, 3 is an action module, 31 is a hydrogen flow rate adjustment valve, 32 is a natural gas flow rate adjustment valve, 33 is a pressure adjustment valve, 34 is a bleeding solenoid valve, 4 is a PLC module, 40 is a PLC, 41 is an analog input unit, 42 is an analog output unit, 50 is a first check valve, 51 is a second check valve, 6 is a mixing mechanism, 70 is a bleeding safety valve, and 71 is a bleeding hand valve.
Detailed Description
The following embodiments are only intended to illustrate the present invention in detail, and do not limit the scope of the present invention in any way.
The programs referred to or relied on in the following embodiments are all conventional programs or simple programs in the art, and those skilled in the art can make routine selection or adaptation according to specific application scenarios.
Components, structures, mechanisms, sensors, and the like in the following examples are all conventional commercially available products unless otherwise specified.
The embodiment is as follows: a natural gas loading pipeline control system, see fig. 1-2, comprising: PLC module, control terminal, sensor module, action module.
The PLC module includes: the system comprises a CPU SR20 AC/DC/RLY PLC, an EM AI04 analog input unit and an EM AQ04 analog output unit; the analog input unit and the analog output unit are correspondingly connected with the PLC through buses respectively.
The operation panel comprises a Smart Line 700IE V3 touch screen, an emergency stop button, a start button and a stop button, wherein the touch screen and the PLC are connected through an Ethernet through corresponding RJ45 interfaces, and the emergency stop button, the start button and the stop button are respectively electrically connected with the input of the PLC.
The sensor module includes pressure transmitter, temperature transmitter, volume flowmeter, hydrogen purity changer, and wherein, pressure transmitter, temperature transmitter, hydrogen purity changer correspond with analog input module terminal and are connected, and the RS485 communication port of PLC body is inserted to the volume flowmeter.
Referring to fig. 2, a hydrogen gas source and a natural gas source respectively enter a mixing device through a hydrogen pipeline and a natural gas pipeline which are connected in parallel, and enter a mixer pipeline after being fully mixed by the mixing device. The hydrogen pipeline is provided with a pressure regulating valve, a pressure transmitter, a temperature transmitter, a hydrogen flow regulating valve, a hydrogen flowmeter and a first check valve from upstream to downstream in sequence; the natural gas pipeline is sequentially provided with a pressure transmitter, a temperature transmitter, a natural gas flow regulating valve, a natural gas flowmeter and a second check valve from the upstream to the downstream; the mixing pipeline is sequentially provided with a diffusing pipeline, a pressure transmitter, a temperature transmitter and a hydrogen concentration transmitter, wherein the diffusing pipeline consists of a diffusing safety valve, a diffusing hand valve and a diffusing electromagnetic valve which are connected in parallel and is respectively used for overpressure emergency diffusion, manual diffusion and automatic diffusion.
The operation and use method of the natural gas loading system is as follows (see figure 3):
when the natural gas flow regulating valve is used, the opening degree and the hydrogen mixing proportion of the natural gas flow regulating valve are set on the touch screen, after the start button is pressed, the system starts to work, and the system automatically regulates the natural gas flow regulating valve to the set opening degree. When the system is used for hydrogen loading, the pressure regulating valve can be automatically regulated, and the pressure of hydrogen is ensured to be greater than the pressure of natural gas by 0.2 MPa. The hydrogen purity transmitter on the mixer pipeline can monitor whether the purity of the hydrogen in the mixed gas meets the set hydrogen mixing proportion in real time, when the hydrogen ratio in the mixed gas exceeds the set value, the system automatically controls the hydrogen flow regulating valve to be closed slightly, and when the hydrogen ratio in the mixed gas is lower than the set value, the system automatically controls the hydrogen flow regulating valve to be opened greatly.
When emergency occurs, or an emergency stop button and a stop button are pressed, or the pressure regulating valves are fully opened and the hydrogen pressure is not higher than the natural gas pressure by 0.2MPa, or the hydrogen flow regulating valves are fully opened and the set hydrogen adding proportion is not reached, or the pipeline is over-pressurized and over-heated, the system closes the regulating valves and the pressure regulating valves, opens the bleeding electromagnetic valve for bleeding, and finishes the hydrogen adding work. When system failure occurs, gas in the system is in overpressure, and the relief safety valve is automatically opened when reaching an opening pressure critical value, so that emergency relief is realized.
The present invention has been described in detail with reference to the accompanying drawings and embodiments, but those skilled in the art will understand that various specific parameters in the above embodiments can be changed or equivalent substitutions can be made on related components, structures and materials without departing from the technical concept of the present invention, thereby forming a plurality of specific embodiments, which are common variations of the present invention and will not be described in detail herein.
Claims (5)
1. The utility model provides a natural gas loading pipeline control system based on PLC which characterized in that includes: the system comprises a PLC module, a control terminal, a sensor module and an action module; the control terminal, the sensor module and the action module are respectively and electrically connected with the PLC module;
the sensor module comprises a hydrogen purity transmitter arranged in the mixed gas pipeline;
the action module comprises a pressure regulating valve arranged on the upstream of the hydrogen supply pipeline.
2. The PLC-based natural gas loading pipeline control system according to claim 1, wherein the PLC module comprises: the device comprises a PLC, an analog input unit and an analog output unit; the analog input unit and the analog output unit are respectively connected with the PLC through buses.
3. The PLC-based natural gas loading pipeline control system according to claim 1, wherein the control terminal comprises a touch screen, an emergency stop button, a start button and a stop button;
the touch screen is in communication connection with the PLC,
the emergency stop button, the start button and the stop button are respectively and correspondingly electrically connected with the I/O of the PLC.
4. The PLC-based natural gas loading pipeline control system according to claim 1, wherein the action module further comprises: a hydrogen flow regulating valve and a natural gas flow regulating valve which are respectively used for being arranged in a hydrogen supply pipeline provided with a first check valve and a natural gas supply pipeline provided with a second check valve, and a bleeding electromagnetic valve which is arranged in a bleeding pipeline.
5. The PLC-based natural gas loading pipeline control system according to claim 1, wherein the sensor module further comprises: when the device is used, the pressure transmitter and the temperature transmitter are respectively arranged in the hydrogen supply pipeline, the natural gas supply pipeline, the mixing mechanism and the mixed gas pipeline in pairs, and the hydrogen flowmeter and the natural gas flowmeter are respectively arranged at the upstream of the check valves in the hydrogen supply pipeline and the natural gas supply pipeline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220933590.3U CN217356498U (en) | 2022-04-22 | 2022-04-22 | Natural gas hydrogen-loading pipeline control system based on PLC |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220933590.3U CN217356498U (en) | 2022-04-22 | 2022-04-22 | Natural gas hydrogen-loading pipeline control system based on PLC |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024066459A1 (en) * | 2022-09-30 | 2024-04-04 | 上海飞奥燃气设备有限公司 | Method and system for controlling hydrogen doping concentration in natural gas in fuel gas pipeline |
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2022
- 2022-04-22 CN CN202220933590.3U patent/CN217356498U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024066459A1 (en) * | 2022-09-30 | 2024-04-04 | 上海飞奥燃气设备有限公司 | Method and system for controlling hydrogen doping concentration in natural gas in fuel gas pipeline |
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