Application of metering system in natural gas pipeline
In the process of natural gas transmission, the difference between the output and the input is called the transmission difference. The transmission difference is usually caused by the non-metering loss of natural gas. In the measurement management work, loss calculation is an important analysis tool. The simple calculation formula is as follows: Loss difference Q = (Q intake Q original pipe deposit)-(Q export Q consumption Q current deposit).
Use the SCADA system to call out the relevant pressure, temperature and flow into the formula for calculation, and analyze the calculation results. If the input difference continues to increase or decrease, it can basically be determined that the measurement system is faulty. The absolute value of the input difference can be roughly Determine the scope of occurrence of measurement failure.
The metering system mainly uses standard orifice metering devices, and the station-controlled flow computer collects on-site pressure, temperature, and differential pressure to calculate the flow in real time. The control center can use the SCADA system to check the related parameters such as pressure, temperature, differential pressure, etc. in real time, and can set upper and lower alarm limits for the relevant parameters. When the flow exceeds the limit, the system will emit an audible and visual alarm within one scan period, on duty Dispatching can make judgments based on the alarm information and direct related stations to switch processes or flow control, which effectively avoids long-term flow overruns and minimizes metering losses.
The measurement system for the natural gas pipeline for custody transfer is located at each distribution station. To ensure the accurate operation of the measurement system, the central computer of the control center uses the remotely collected data to perform flow calculation at the same time. Through the comparison analysis of the two flow calculation systems, It can realize the remote monitoring of the operation status of the flow computer of each substation, and find the abnormal situation of the flow calculation part of each station in time.
Curve analysis is an important function provided by the SCADA system. By calling historical data for a certain period of time to analyze the curve, it can basically determine the time, location and general scope of the measurement loss. The curve analysis provides a microscopic analysis method for measurement management.
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