The computer of the system adopts the industrial control machine with the advantages of dustproof and wide working temperature range. The operating system of the industrial computer in the station adopts Windows2000 Professional, and the database platform adopts Microsoft SQL Server2000, which is loaded with RS485 communication program, gas station reporting system, server management system and other applications. software.
Second, the card machine linkage and network management system features
Third, the analysis and improvement of the card machine linkage of the gas filling machine and the column At present, the gas filling machine and column of the CNG station of Dagang Oilfield not only do not have the linkage function and communication function of the card machine, but also cannot be fixed and quantitatively refilled. According to the operation situation of CNG refueling station in Dagang Oilfield and the technical characteristics of the system, we have further analyzed and improved the linkage function, communication function, quota and quantitative refueling function of the card machine, making the system more efficient, efficient and accurate in application. .
1 If an abnormality occurs in one communication line, it sometimes affects the other two communication lines, causing the interruption of the entire communication system. In view of the frequent problems in this type of communication mode in the card machine linkage communication system, after research, it is transformed into a ring network form, that is, a main line is used to connect the various gas filling devices in series and then connect with the upper computer. The communication system continuously detects through the ring network. When the airer/column is refilled, the detection signal receives the data and uploads the data to the upper computer through RS485, and then processes the data in the upper computer.
2. Improvement of flow protection function
Traffic protection is set in this system. The intake lines of the low, medium and high pressure gas storage wells are respectively set to the automatic switching function of the flow rate lower limit. However, in most CNG filling stations, gas storage wells are only used for car refueling. The gas filling column itself is only filled by the compressor, and the displacement of the compressor is rated under certain conditions, so the flow lower limit protection function in the system is not feasible in the gas column. At the same time, the displacement of the compressor will be affected by many factors, such as the pressure of the imported gas and the wear of the exhaust valves at all levels. Therefore, the displacement of the same compressor will also change in different periods and in different situations. Therefore, in the modification of the gas column of the CNG filling station in Dagang Oilfield, the flow protection function is shielded.
3. Optimization of pressure protection parameters The pressure protection function is set in this system, and the compressor itself also has a shutdown pressure setting function. The selection of the set value between the two will directly affect the production and safety of the gas station. . If the card machine linkage system pressure protection setting is too high compared to the compressor shutdown setting, then when the compressor is stopped, the card machine linkage system is still in working state, and the intake solenoid valve in the refueling device is still in the open position. The next time you refill, you will not start the “on†button on the refueling device, the compressor will start, which will directly affect the personal safety of the operator. Conversely, if the card machine linkage system pressure protection is lower than the compressor shutdown setting, when the refueling device solenoid valve is closed, the compressor continues to work, which will cause a huge waste of electrical energy.
4. As the temperature changes, the pressure will change accordingly. Therefore, the setting of the temperature compensation system is also critical. After research, it was found that for gases with typical natural gas components (different regions, component changes may be large), the temperature change 1F ° pressure will vary by 13 PSI (0.11 MPa / ° C). Therefore, in the system we have added a temperature compensation system to ensure the safe production of the gas station.
IV. Application effect of the card machine linkage system The system was put into operation at the CNG station of Dagang Oilfield in 2005. After a period of production inspection, the system proved to be powerful and stable, and gradually showed its sales, settlement, charges, etc. Aspects of the advantages.
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