论文部分内容阅读
针对混合制冷剂循环液化天然气流程能耗高、效率低的现状,运用HYSYS软件对液化流程模型进行优化,分析评价表明,压缩机、冷却器、多股流换热器、节流阀及混合器的损失依次减少。探讨了流体压力、温度、压缩比等参数对压缩过程不可逆性的影响,第一段压缩机出口压力为1 074 k Pa、压缩比为2.02,第二段压缩机进口温度为40℃、压缩比为3.63时,最小压缩机比功耗、损失为5.98 k Wh/kmol、15 840.06 k W。优化换热器操作,保持夹点温差、对数平均温差约3、5℃,换热器损失减少41%。借助分析原料气的CP-T分布,在满足不同温区所需冷量的基础上,合理配置制冷剂组分,调整制冷剂蒸发压力可降低换热过程损失。
In view of the high energy consumption and low efficiency of liquefied natural gas (LNG) cycle in mixed refrigerant cycle, HYSYS software was used to optimize the liquefaction process model. The analysis and evaluation showed that compressors, coolers, multi-flow heat exchangers, The loss of the mixer decreases in turn. The influence of parameters such as fluid pressure, temperature and compression ratio on the irreversibility of the compression process was discussed. The first stage compressor outlet pressure was 1 074 kPa, the compression ratio was 2.02, the second stage compressor inlet temperature was 40 ℃, and the compression ratio At 3.63, the minimum compressor specific power loss was 5.98 k Wh / kmol and 15 840.06 kW. Optimize the operation of the heat exchanger to maintain the temperature difference between the pinch points. The average logarithmic temperature difference is about 3,5 ° C, and the loss of the heat exchanger is reduced by 41%. By analyzing the CP-T distribution of feed gas, it can reduce the heat transfer process and loss by adjusting the refrigerant composition and adjusting the evaporation pressure of refrigerant on the basis of meeting the required cooling capacity in different temperature zones.