Abstract:

In order to establish the combined-cycle of CCHP (combined cool heat and power) using natural gas and biomass as fuels, a series of thermodynamic parameters and boundary condition has been tested on ASPEN PLUS simulation plat.And the conversion process of thermal and power of the key part in the system have been discussed, as well as the distributions of material flow rate, pressure and temperature in the system.Besides, the effects of the inputting parameters on economic, technical and emission performance have been studied.The results show that the proportion of natural gas and biomass gasification has a very important impact on exhaust temperature and pressure of gas turbine, waste heat boiler.So does the energy gradient.Under certain blend ratio, with the increase in air, exhaust temperature of gas turbine and waste heat boiler will obviously decline.Though the total capacity utilization increases, relatively energy-saving rate, equivalent exergy efficiency and economy exergy efficiency of the system continue to decreases.And, the air temperature and the ambient temperature will result in overall energy efficiency of the system improved.

Key words: biomass, syngas, mathematical modeling, optimal design, energy conservation and emissions reduction

摘要：

利用ASPEN PLUS稳态模拟平台测试修正热力参数、流动过程的作用条件,以建立冷热电联供(CCHP)系统的联合循环,研究了系统中关键单元的热功转换过程,以及物流的流率、压力和温度分布,探讨了各输入参数对系统经济、技术和排放性能等的影响。结果表明:(1)预设工况下,燃气轮机进口温度为340℃,系统总能利用率达到94.65%,经济效率达到67.27%,CO₂、CO、NO₂、NO、SO₂排放量分别为0.5 kg·(kW·h)^-1、1.025 mg·(kW·h)^-1、0.15 g·(kW·h)^-1、6 g·(kW·h)^-1、3.7 g·(kW·h)^-1;(2)随着空气流量的增加,燃气轮机和余热锅炉的排气温度急速下降,总能利用率上升,而相对节能率、当量效率和经济效率不断减小。因此,空气的量应控制在理论空气量的20%~40%之间;(3)随着空气温度及环境温度的升高,燃料的气化率会微小地下降,但系统的总体能效性能会提高。

关键词: 生物质, 合成气, 数学模拟, 优化设计, 节能减排