TP3-12 433 Validating a dynamic grid model with tracer gas injection and analysis

摘要

Commissioned by Liander, the Dutch research institute TNO has developed a dynamic computer model of its gas grid. This model provides an insight how gas predictively flows through this grid, and is one of the building blocks toward making a smart grid. A combination of data from a variety of already present measuring devices, including flowmeters, pressure and temperature sensors, as well as information from static modelling software, was used to build this dynamic model. To validate the dynamic model a tracer gas test was conceived and executed. During this field test a traceable gas was injected in the gas grid, and analysers were attached to two gas pressure regulating stations further along the network to detect it. The spread and time of arrival of the tracer gas revealed how the gas actually travelled through the grid. This real-time information could then be compared with the virtual flow inside the model. A dry run of the test itself was done in Liander's "Gas Test Facility", a grid bypass in Amsterdam where in a controlled and monitored environment gas flows up to 14.000m(n)3/h and a pressure up to 8bar can be achieved. During this dry-run phase intimate working knowledge of all the necessary equipment - and the tracer gas itself - was gained, to minimise the risk of any unforeseen problems during the upcoming field test. The field test was designed in such a way that the gas grid itself does not have to be opened up and the live gas supply to customers remains uninterrupted. Existing valves, both under and above ground, where used to connect the equipment, or non-intrusive devices were used.The tracer gas test was a complete success and the Dynamic Grid Model was validated with it. The tracer technique itself is relatively simple and undisruptive to use and can be repeated indefinitely to fine-tune the model even further.