天然气储气库往复式压缩机异常磨损分析和控制

“十四五”期间全国天然气管网已形成了互联互通，但管输气质更加复杂，一定量的粉尘广泛存在于天然气管道中，导致储气库往复式压缩机压缩缸发生异常磨损。基于切向撞击能量模型，结合现场测量和计算流体力学动网格方法，明确了压缩缸磨损特性。结果表明，压缩缸内润滑油与粉尘混合后形成研磨膏，随着粉尘质量浓度从0.01%增至3.00%，研磨膏黏度从4.51×10⁵mPa·s 增加至 1.27×10⁶mPa·s，密度从890 kg/m³增至980 kg/m³；压缩缸磨损多发生在其12点和6点钟方向，当活塞在行程的两侧时，压缩缸内剪切应力和磨损速率最小，当活塞位于行程中点时，压缩缸内剪切应力和磨损速率最大；发现对于每1000 h运行不需修复压缩缸(磨损量小于0.13 mm)，粉尘质量浓度宜控制在0.60%以下，每5000 h和每10000 h运行不需更换压缩缸(磨损量小于1.16 mm)，粉尘质量浓度应分别控制在1.30%和0.40%以下；当粉尘质量浓度为0.01%时，磨损速率随润滑油黏度降低而降低，当粉尘质量浓度为0.5...

Analysis and control of abnormal wear of reciprocating compressor in natural gas underground storage cavern

During China's 14th five-year plan period, the national natural gas pipeline network has been interconnected, and the gas quality became more complex. A certain amount of dust particles widely spread in the natural gas pipeline, and led to abnormal wear of the reciprocating compressor's cylinder in the underground storage cavern. Based on the SIEM (Shear Impact Energy Model), combined with field measurement and moving-grid method of computational fluid dynamics, the wear characteristics of the compression cylinder are well demonstrated. The results show that the lubricating oil is mixed with dust particles to form grinding paste. With the increase of particle mass concentration from 0.01% to 3.00%, the viscosity of grinding paste increases from 4.51×105 mPa?s to 1.27×106 mPa?s, and the density increases from 890 kg/m3 to 980 kg/m3. The abnormal wear often occurs at 12 o'clock and 6 o'clock of the compression cylinder. When the piston is in the midpoint of the stroke, the wall shear rate as well as the wear rate are the highest. When the piston is in the two end points of the stroke, the wall shear rate as well as the wear rate are the slightest. For every 1000 hours of operation without repairing the cylinder, the particle mass concentration should be controlled below 0.60%. For every 5000 hours and 10 000 hours of operation without replacing the cylinder, and the particle mass concentration should be controlled below 1.30% and 0.40% respectively. When the particle mass concentration is 0.01%, the wear rate decreases with the decrease of lubricating oil viscosity. When the particle mass concentrations are 0.51% and 1.00%, the lubricating oil viscosities are 2.59×105, 2.21×105 and 1.97×105 mPa?s, the calculated wear rate increases sharply with decrease of lubricating oil viscosity.