The solid dust, ammonia sulfide, condensate, water and other liquid substances carried by natural gas in the pipeline transport process do serious harm to the safe operation of pipelines and instrumentation equipment along the way. The performance of the filter installed in the natural gas station and the user entrance is the key to the quality and flow of gas supply. The performance of the filter element changes dynamically with the use. If the filter element cannot be cleaned and replaced in time, the passing efficiency of gas will be seriously affected and the local resistance will soar and the passing flow will drop sharply, thus causing the safety problem of gas supply. In this paper, based on the investigation and analysis of the working condition of natural gas filter in actual engineering, a numerical model of natural gas filter was established, and the flow field inside the filter was simulated by means of CFD tool. The research shows that the change of inlet velocity has a great influence on the filtering effect. When the inlet velocity is about 13m/s, the filtering effect is the best, reaching more than 96%. Under limited conditions, it is recommended to give priority to the replacement of the lower filter element.
Keywords gas filter, numerical simulation, flow distribution, filter efficiency