新型高压天然气管道内固体颗粒物在线检测装置及其应用

掌握天然气管道内固体颗粒物的含量情况对于分离过滤设备的选型、制订合理的生产运行方案非常重要。常规离线检测技术取样时间较长，不能及时反映管道中固体颗粒物含量的变化情况，已有在线检测技术需前置体积庞大的减压装置，操作繁琐，且在减压装置的实际应用过程中由于节流作用会使得高压天然气管道中有液滴析出，影响在线测量结果的准确度。为此，研发了一套可以直接对高压天然气管道内固体颗粒物进行在线检测的装置，该装置去除了减压装置并提高了检测仪的耐压能力，整体结构简单，操作方便，便携性好。应用该装置对国内某天然气计量站高压多管旋风分离器进出口管道内固体颗粒物的含量进行了测定，测得其中位粒径范围为1.34～3.40 μm，与离线检测方法测得的结果（1.36～2.55 μm）较为接近，表明该技术可较准确地快速检测出天然气管道内固体颗粒物的浓度和粒径分布，并可实时监测其变化情况。

A novel on-line detector for solid particles in natural gas pipelines under high pressure: A case study

To know well the content of solid particles in natural gas pipelines is essential to the type selection of filtering equipment and the programming of a reasonable operation scheme. The conventional off line detection technology will burn time and be impossible to reflect the real time content change of solid particles in the lines. On the other hand, the existing on line detection technology will involve such a preposed decompressor of huge bulk which is complicated to operate; and in its actual application, due to the throttling action, liquid drops precipitate in the high pressure lines, which will influence the on line detection results. In view of this, a novel on line detector is developed for solid particles in natural gas pipelines under high pressure. Abandoning the huge bulk of that decompressor, this new detector has a good performance of pressure resistance as well as some other advantages such as being simple in structure, easy to operate, portable to move, and so on. This novel on line detector was applied to the measurement of solid particles content in the inlet and outlet lines of a high pressure multitubular cyclone at a natural gas metering station in China. As a result, the particle sizes were measured as 1.34 ~ 3.40 μm, which was very close to the results of 1.36 ~ 2.55 μm measured by the off line detector. In a word, this novel technology can not only rapidly and accurately detect the concentration of particles and particle size distribution but achieve the real time monitoring of their variation in natural gas pipelines.