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一前言在石油部标准SYL04-83,即“天然气流量的标准孔板计量方法”的实用公式中,引入了天然气的相对密度G。计量的标准条件为20℃,101.325kPa,而天然气气相色谱分析给出的组分体积百分数又是0℃、101.325kPa条件下的,这就给计量中提出了一个因状态条件改变,相对密度G是否有变化的问题,若有变化,其变化后的值应怎样考虑及处理。二、天然气相对密度的概念石油部标准SYL04-83附录B·l中给天然气相对密度G下的定义是:气体的相对密度G为气体密度与干空气密度之比,即分子量之比。G是按实际气体取样分析,通过计算得出:
I. INTRODUCTION The relative density G of natural gas has been introduced into the practical formula of the Ministry of Petroleum standard SYL04-83, “Standard Orifice Metering Method for Natural Gas Flow”. The standard conditions for the measurement are 20 ° C and 101.325 kPa, while the gas chromatographic analysis of natural gas gives a fractional volume fraction of 0,0 and 101,325 kPa. This gives a measure of the change in state conditions, relative density G If there are any changes, if there is any change, what should be changed and what should be dealt with? Second, the concept of relative density of natural gas Ministry of Petroleum Standards SYL04-83 Appendix B · to G relative density of gas is defined as follows: gas relative density G is the ratio of gas density and dry air density, that is, the molecular weight ratio. G is based on the actual gas sampling analysis, calculated by: