摘要
从压缩机压比、燃料利用率以及运行温度对系统工作性能影响的角度,对一种SOFC-GT-ST联合循环动力系统进行了热力系统性能的模拟分析。结果发现。压比为14、汽碳比为2.1、燃料利用率为0.85、SOFC运行温度不高于950℃的工况下,系统性能最优。将钙循环碳捕集工艺耦合入联合循环系统。在输入钙循环碳捕集系统中天然气设为定值的基础上,对影响系统碳捕集率以及发电率的各因素进行模拟分析。模拟了在不同碳化炉温度、煅烧炉温度、气固分离率、钙酸比以及驰放率诸因素的影响下,系统的碳捕集率和汽轮机组发电功率的变化,同时发现将一部分排气进行回流对冷流传热的做法可以提高循环效率。模拟确定了各因素最优解,即碳化炉温度为630℃、煅烧炉温度为950℃、气固分离率为98%、钙酸比设为1.1、驰放率设为0.02时,系统热力学性能以及碳捕集率最优,系统发电效率为60.32%,相比原始系统下降12.76%,系统碳捕集率达到90.36%。
The thermodynamic system performance of a new SOFC-GT-ST combined cycle power system is simulated and analyzed.Effects of compressor pressure ratio,fuel utilization and SOFC operating temperature on the system performance are also simulated.The results show that when the pressure ratio is 14,the steam carbon ratio is 2.1,the fuel utilization ratio is 0.85 and the SOFC operating temperature is not higher than 950℃,the system performance is optimal.Then,the calcium cycle carbon capture process is coupled into the combined cycle system.Factors affecting the system carbon capture rate and power generation rate are simulated and analyzed on the basis of setting the natural gas input into the calcium cycle carbon capture system as a fixed value.The changes of carbon capture rate and steam turbine power are simulated with different values of carbonization furnace temperature,calciner temperature,gas-solid separation rate,calcium acid ratio and relaxation rate.The simulation results show that the circulation efficiency can be improved by refluxing part of the exhaust steam to transfer heat to the cold flow.The thermodynamic performance and carbon capture rate of the system are optimal in the situation where the carbonization furnace temperature is 630℃,the calciner temperature is 950℃,the gas-solid separation rate is 98%,the calcium acid ratio is 1.1 and the relaxation rate is 0.02.The power generation efficiency of the system is 60.32%,which is 12.76%lower than the original system.Whereas,the carbon capture rate of the system reaches 90.36%.
作者
田松峰
李正宽
刘亚轩
张都
刘诗尧
TIAN Songfeng;LI Zhengkuan;LIU Yaxuan;ZHANG Du;LIU Shiyao(Baoding Key Laboratory of Low Carbon and High Efficiency Power Generation Technology,North China Electric Power University,Baoding 071003,China)
出处
《电力科学与工程》
2021年第12期37-46,共10页
Electric Power Science and Engineering
关键词
钙循环
碳捕集
SOFC发电系统
热力学性能
碳排放处理
calcium circulation
carbon capture
SOFC power generation system
thermodynamic properties
carbon emission treatment
