天然气中汞的直接测定方法

针对国内外尚无针对含油、含水较多井口天然气或处理厂原料气汞含量检测标准的问题,为消除芳香烃干扰的影响,结合天然气中几乎全部为单质汞的特点,提出了天然气中汞的直接测定方法;该方法首先测得带有干扰影响的检测值,然后再将天然气通过特殊的汞过滤器,该过滤器只对天然气中的汞有吸附作用而对干扰物无吸附作用,这样就可得到仅有干扰物影响的检测值,两者相减即为真实的天然气汞含量。研究表明,该方法不仅具有很好的稳定性和可对比性,而且操作简便,便于推广使用;不仅适用于产品气,而且适用于含油、含水较多的井口天然气和处理厂原料气。

Determination of mercury in natural gas by direct measurement

Since there is no testing standard for mercury content determination in wellhead natural gas or raw natural gas with liquid hydrocarbon or water in the world, to eliminate the interference of aromatic hydrocarbons, the author proposes a direct determination method according to the characteristics that mercury in natural gas is almost all elemental mercury. This method firsts get the value with mercury and interference, and then the value only with interference with a filter which only adsorbing mercury. By subtraction of two values, the real mercury content will be got. Research shows that this method is not only stable and comparable, but also is easy to master, and is not only suitable for product gas, but also for raw natural gas.