Two novel thermal cycles based on Brayton cycle and Rankine cycle are proposed, respectively, which integrate the recovery of low-level waste heat and Liquefied Nature Gas （LNG） cold energy utilization for power gen...Two novel thermal cycles based on Brayton cycle and Rankine cycle are proposed, respectively, which integrate the recovery of low-level waste heat and Liquefied Nature Gas （LNG） cold energy utilization for power generation. Cascade utilization of energy is realized in the two thermal cycles, where low-level waste heat,low-temperature exergy and pressure exergy of LNG are utilized efficiently through the system synthesis. The simulations are carried out using the commercial Aspen Plus 10.2, and the results are analyzed. Compared with the conventional Brayton cycle and Rankine cycle, the two novel cycles bring 60.94% and 60% in exergy efficiency, respectively and 53.08% and 52.31% in thermal efficiency, respectively.展开更多
针对冷能回收再利用问题,提出了一种结合LNG和燃煤废气发电与天然气再液化的冷能利用系统并对系统进行了改进。对原系统和系统改进部分进行了热力学计算,详细分析了蒸发压力、蒸发温度对系统热力性能的影响,分析了天然气液化率对系统净...针对冷能回收再利用问题,提出了一种结合LNG和燃煤废气发电与天然气再液化的冷能利用系统并对系统进行了改进。对原系统和系统改进部分进行了热力学计算,详细分析了蒸发压力、蒸发温度对系统热力性能的影响,分析了天然气液化率对系统净输出功的影响,确定了发电循环的最佳蒸发压力、蒸发温度及天然气液化率的范围。结果表明:以回收1000 kg·h^(-1)的LNG冷量计算,发电系统最大净输出功为69.6 k W·h,系统冷回收效率为41.43%;液化系统LNG液化率最大值为24%;系统改进后,发电系统净输出功和冷回收效率提高了17.85%,液化系统LNG液化率提高至28%。为日后LNG气化供气过程中的冷能利用提供一种新的思路。展开更多
基金the Science and Technology Foundation of Shaanxi Province (No.2002K08-G9).
文摘Two novel thermal cycles based on Brayton cycle and Rankine cycle are proposed, respectively, which integrate the recovery of low-level waste heat and Liquefied Nature Gas （LNG） cold energy utilization for power generation. Cascade utilization of energy is realized in the two thermal cycles, where low-level waste heat,low-temperature exergy and pressure exergy of LNG are utilized efficiently through the system synthesis. The simulations are carried out using the commercial Aspen Plus 10.2, and the results are analyzed. Compared with the conventional Brayton cycle and Rankine cycle, the two novel cycles bring 60.94% and 60% in exergy efficiency, respectively and 53.08% and 52.31% in thermal efficiency, respectively.
文摘针对冷能回收再利用问题,提出了一种结合LNG和燃煤废气发电与天然气再液化的冷能利用系统并对系统进行了改进。对原系统和系统改进部分进行了热力学计算,详细分析了蒸发压力、蒸发温度对系统热力性能的影响,分析了天然气液化率对系统净输出功的影响,确定了发电循环的最佳蒸发压力、蒸发温度及天然气液化率的范围。结果表明:以回收1000 kg·h^(-1)的LNG冷量计算,发电系统最大净输出功为69.6 k W·h,系统冷回收效率为41.43%;液化系统LNG液化率最大值为24%;系统改进后,发电系统净输出功和冷回收效率提高了17.85%,液化系统LNG液化率提高至28%。为日后LNG气化供气过程中的冷能利用提供一种新的思路。
