新型燃气-氨水蒸汽功冷联供联合循环

A Novel Gas-ammonia/Water Combined Cycle for Power and Refrigeration Cogeneration

基于能的梯级利用原理及氨水工质系统的能量利用特性,将产功与制冷有机结合,提出一种由燃气轮机循环和氨水工质功冷联供循环组成的新型燃气-氨水蒸汽功冷联供联合循环。在系统能量输入及主要参数相同的前提下,将新循环与由常规燃气-蒸汽联合循环和氨吸收式制冷循环组成的功冷联供联合循环进行模拟计算比较,发现新循环的功、冷输出均有增加,热效率和火用效率分别相对提高了6.3%和1.9%。通过火用平衡分析,揭示了新循环的系统性能提高的主要原因在于加热、排烟过程火用损失的大幅减小,证明采用氨水作为底循环工质是将常规燃气-蒸汽联合循环发展为功冷联供循环,提高系统性能的有效措施。

A novel gas-ammonia/water combined cycle for power and refrigeration cogeneration, which includes a gas turbine cycle and an ammonia/water cycle for power and refrigeration cogeneration, is proposed based on the principle of energy cascade utilization and the energy utilization characteristics of the ammonia/water system. With the same energy input and the main cycle parameters, simulation calculation and comparison are carried out between the novel combined cycle and the other combined cycle including a gas-steam combine cycle and an ammonia absorption refrigeration cycle. The results show that there are some increases in the power and the refrigeration outputs, and the novel one has the relative improvements of 6.3% in the total energy efficiency and 1.9% in the exergy efficiency. The exergy balances have been made for these two systems, and which reveals that the decreases of the exergy loss in the heat addition and the exhaust emission process are the main reasons for the improvements of the novel cycle. It is proved that using the ammonia/water mixture as the working fluid of the bottom cycle is an effective way of developing the conventional gas-steam combined cycle into the power and refrigeration cogeneration system and improving the cycle performance.