随着天然气的使用越来越广泛和气体流量计量的发展,高准确度等级的国外进口气体流量仪表的使用在逐渐增加,例如0.2级和0.5级的湿式流量计开始涉及一些贸易结算领域,为保证其计量的准确性的同时又不降低计量准确度等级并且还便于操作,本文以排水取气法为研究方向,拟建立一套扩展测量不确定度在0.06%的气体流量标准装置。 With the increasing use of natural gas and the development of gas flow metering, the use of imported gas flow meters of high accuracy grades is gradually increasing. For example, wet flow meters in grades 0.2 and 0.5 have started to deal with a few trade settlements. To ensure the accuracy of its measurement without reducing the level of measurement accuracy and also easy to operate, this paper takes drainage and gas extraction as the research direction and intends to establish a standard set of gas flow expansion devices with measurement uncertainty of 0.06%.