摘要
辽河油田200万m3/d天然气轻烃回收装置,目前由于设计规模与实际处理量不匹配,设备老化严重,装置已不能满足生产运行要求,拟新建一套处理规模为100万m3/d的轻烃回收装置。通过大量模拟计算,分析了C2、C3收率与制冷温度和总能耗之间的关系,确定了制冷温度为-114℃,C2收率为85%、C3收率为98%的最优工艺参数。针对工程特点对轻烃回收方案进行了优选,最终确定了膨胀机制冷加丙烷辅助制冷的同轴前增压的轻烃回收方案。该方案采用丙烷辅助制冷系统,增强了装置对组分波动的适应性,避免了目前装置氨系统的腐蚀问题;再生气取自分子筛出口并返回压缩机三级入口,利用原料气压缩机三级增压,增加装置运行的平稳性,同时取消再生气分离器,减少了投资;增设再生气换热器,回收再生气余热590kW,减少燃料气消耗40万m3/a以上;冷量和热量梯级利用,能量利用率高,单位综合能耗低于国内和国际能耗水平。
The 200×104 m3/d light hydrocarbon recovery equipment in Liaohe Oilfield is the biggest one in China.Because the actual treatment capability of the equipment is far lower than the designed one and the equipment is severe aging,the equipment can not satisfy the production requirement.Therefore,a new projectis planned to build which has a treatment capability of 100×104 m3/d.The VMGSIM numerical simulation results show that the optimal process conditions of the equipment are as follows:the lowest cooling temperature of-114℃,C2 recovery rate of 85% and C3 recovery rate of 98%.Moreover,the scheme optimization for the equipment is carried out according to its engineering characteristics.The coaxial anterior turbocharged technique and process of expander refrigeration plus the propane auxiliary refrigeration are applied.The analysis shows that the propane auxiliary refrigeration process greatly enhances the adaptability of component fluctuation and avoids the corrosion problem of the ammonia refrigeration system.The regenerated gas from molecular sieve desiccator outlet returns to the three-stage inlet of the compressor,than the gas pressure is increased by the compressor,thus enhances the stability of the system,and it decreases the investment by canceling the regenerated gas separator.The new regenerated gas heat exchanger recycles the waste heat of 590 kW and decreases the consumption of fuel gas of 40×104 m3/a;the cool energy and heat energy is step-by-step utilized,and the unit consumption of energy is below the domestic and international expenditure standard of energy.
出处
《石油工程建设》
2010年第2期8-12,共5页
Petroleum Engineering Construction
关键词
天然气
轻烃回收装置
方案优化
natural gas
light hydrocarbon recovery equipment
scheme optimization
