中亚天然气管道的干燥工艺

Drying process of Central Asian Natural Gas Pipeline

中亚天然气管道部分管段因地形复杂、管道高低差距较大,扫水后管道弯头和低洼处存留少量残余水,必须对管道进行干燥。对比了干空气干燥和真空干燥两种方法的工艺要求和施工工期,结果表明:由于干燥工期主要取决于管道试压后管道内的残余水量、泡沫清管器的使用效果、空压机的排量和最终露点要求,综合考虑中亚天然气管道的干燥要求、施工工期以及投入使用效果,最终选择使用受外界因素影响小且干燥效果较好的干空气干燥法。中亚天然气管道的干空气干燥设备包括空压机、干燥器、露点仪、发球筒、收球筒及快开盲板等,基于此给出了现场施工设备的安装和施工步骤。

Due to complex terrain,high altitude difference along the Central Asian Gas Pipeline and existed residual water at low point of pipe after purging,the Pipeline has to be dried. The author contrasts the treatment requirements and the construction period of the dry-air drying and vacuum drying. Results indicate that because the drying period mainly depends on the residual water volume of the pipeline after pressure test,the effect of foam pig,the displacement of the air compressor and the final dew point requirements,considering the drying requirements of the Pipeline,construction period and effects,the dry-air drying method with slight external factor and high drying effect is the final choice. The dry-air drying equipments adopted in the Pipeline are consisted of air compressors,dryers,dewpoint meters,pig launching chamber,trap and quick opening closure. This paper provides the procedures of the field construction equipment installation and construction.