关键词: 站场, 噪声, 调压阀, 流场, 降噪装置

Abstract: BInvestigation is made on noise in the process areas of gas transmission pipeline stations, understanding range and distribution of noise that exceeds the related standards. The theories of fluid dynamics are used to analyze the internal flow field of noise source, thus acquiring the noise-generating mechanism. It is necessary to independently develop noise-reducing device for gas pipeline stations once the domestic and foreign noise-reducing technology is not suitable for handling noise of gas pipeline stations. A series of measures are adopted to improve the internal flow field characteristics of noise source, adding a baffle plate behind adjustment valve and installing a fairing behind the baffle plate, adjusting distribution of velocity flow field at adjustment valve, eliminating rushing waters, turbulence and shock wave of gas. As a result, noise of pressure-regulating valve, manifold and bent pipe is lowered, substantially solving the bottleneck that noise exceeds the related standard. This new-type noise-reducing device is structured with noise-eliminating segment, rectification segment and flange-connecting back-up plate. It is suitable for valve, manifold and pipe diameter. The device can be installed inside the pipe by means of flange, with a number of advantages, such as convenience in installation and dismantlement, cost-effectiveness and free from limitation of valve types. Field application indicates that noise is reduced to below the standard specified in the State regulation, helping keep employees of the pipeline stations in health.

Key words: gas pipeline, station, noise, pressure-regulating valve, flow distribution, noise eliminator