伴生气液化处理工艺能耗分析与优化

Energy consumption analysis and optimization of associated gas liquefaction process

为降低伴生气液化处理工艺的能耗,减少冷剂组分和工艺参数之间的相互影响程度。针对双循环混合冷剂(DMR)液化工艺建立了对应的模拟流程,以比功耗为目标函数,换热器温差、压缩机等熵效率等为约束条件,结合KBO法和SQP法完成了工艺流程的能耗优化与调整。结果表明:比功耗的变化趋势与制冷剂中最小碳数组分的变化趋势相同;制冷剂中N_(2)含量越高,比功耗越大;对于预冷剂,应降低C_(2)H_(6)和C_(3)H_(8)的组分含量,升高nC_(5)H_(12)的组分含量;对于深冷剂,应降低CH_(4)、C_(2)H_(6)和N_(2)的组分含量,升高C3H8的组分含量。通过优化制冷剂的流量、配比、压力等参数,总能耗从6236 kW降至4895.1 kW,降幅21.50%;比功耗从0.3746 kWh/kg降至0.3215 kWh/kg,降幅14.17%,节能减排效果显著。

In order to energy consumption of associated gas liquefaction process,the interaction degree between refrigerant components and process parameters is reduced.In view of double-cycle mixed refrigerant(DMR)liquefaction process,the corresponding simulation process is established.Taking the specific power consumption as the objective function and taking the temperature difference of heat exchanger and the entropic efficiency of compressor as the constraint,the energy consumption of process is optimized and adjusted by combining KBO method and SQP method.The results show that the trend of specific power consumption is the same as that of the minimum carbon component in the refrigerant.The higher the N_(2) content in refrigerant is,the greater the specific power consumption is.For the pre-refrigerant,the component content of C_(2)H_(6) and C_(3)H_(8) should be reduced,and the component content of nC5H12 should be increased.For the deep-refrigerant,the content of CH_(4),C_(2)H_(6) and N_(2) should be decreased,and the content of C_(3)H_(8) should be increased.The optimization,refrigerant flow,ratio,pressure and other parameters are adjusted,and the total energy consumption from 6236 kW to 4895.1 kW with a reduction of 21.50%.The specific power consumption is reduced from 0.3746 kWh/kg to 0.3215 kWh/kg with a decrease of 14.17%,which is remarkable on the effect of energy conservation and emission reduction.