天然气净化用过滤元件性能测定与分析

Performance Test of Filter Cartridge for Natural Gas Purification

在天然气长距离管道输送过程中,天然气夹带的固态及液态杂质严重影响压缩机组及管道的可靠运行。为此,利用天然气净化用过滤元件性能检测装置对离心压缩机干气密封过滤器滤芯的性能进行了检测。检测结果表明,所建立的检测方法可有效评价过滤元件的气液过滤性能、气固过滤性能、耐冲击性能和压溃特性;滤芯压降变化情况在不同过滤过程中存在明显差别,气液过滤中滤芯压降逐渐升高,最终在稳态阶段保持稳定,而在气固过滤中,滤芯压降始终呈增长趋势;滤芯气液过滤效率与气固过滤效率之间无对应关系,现场工况下,天然气内含有液态杂质时,宜选用气液过滤效率作为滤芯过滤性能考核指标;当滤芯工作压力波动小于0.5 MPa时,短暂的气流冲击不会影响滤芯的过滤性能。研究结果可为滤芯的选用提供试验依据。

In the long-distance transmission process of natural gas, the reliable operation of the compressor u-nits and pipelines is seriously affected by dusts and droplets entrained in natural gas. The performance of dry seal gas filter cartridges used in centrifugal compressors is investigated. The results show that gas-liquid filtration per-formance, gas-solid filtration performance, impact resistance performance and collapse performance can be effec-tively evaluated by the established measurement methods. Significant difference in the evolution of pressure drop can be observed in different filtration process. Pressure drop increases until it remains constant at the steady stage in the gas-liquid filtration process. However, pressure drop remains increasing through the gas-solid filtration process. There is no corresponding relation between gas-liquid filtration efficiency and gas-solid filtration efficien-cy. When droplets are entrained in natural gas at practical condition, gas-liquid filtration efficiency is preferable for being the evaluation index of filtration performance. When the fluctuation of pressure is less than 0. 5 MPa, the per-formance of the filter cartridges will not be affected by short period airflow impact.