The complex reaction system of the coal gasification coupling C1 reaction was analyzed based on the principles of thermodynamics. The results show that an increase in the temperature is beneficial to the generation of...The complex reaction system of the coal gasification coupling C1 reaction was analyzed based on the principles of thermodynamics. The results show that an increase in the temperature is beneficial to the generation of hydrocarbons with high carbon-atom contents, in which the alkane yield is higher than the alkene yield. The complex reaction system consisting of C, H_2O, CO, CO2, H_2, C_2H_4, C_3H_6 and C_4H_8 was studied, and the obtained results indicated that when the maximum mole fraction content of C_2―C4 olefins was regarded as the optimized objective function, the optimum temperature was approximately 648 K, the pressure was 0.1 MPa, the feed ratio was approximately 0.6, and the maximum mole fraction content of C_2―C_4 olefins was approximately 28.24%. The thermodynamic simulation and calculation of the complex reaction system can provide a basis for the determination and optimization of actual process conditions and are therefore of great theoretical and practical significance.展开更多
The partial coal gasification air pre-heating coal-fired combined cycle (PGACC) is a cleaning coal power system, which integrates the coal gasification technology, circulating fluidized bed technology, and combined cy...The partial coal gasification air pre-heating coal-fired combined cycle (PGACC) is a cleaning coal power system, which integrates the coal gasification technology, circulating fluidized bed technology, and combined cycle technology. It has high efficiency and simple construction, and is a new selection of the cleaning coal power systems. A thermodynamic analysis of the PGACC is carried out. The effects of coal gasifying rate, pre-heating air temperature, and coal gas temperature on the performances of the power system are studied. In order to repower the power plant rated 100 MW by using the PGACC, a conceptual design is suggested. The computational results show that the PGACC is feasible for modernizing the old steam power plants and building the new cleaning power plants.展开更多
利用化学链制氧(chemical looping air separation,CLAS)取代传统空气分离制氧技术,提出了基于化学链制氧的煤气化集成系统。以Mn2O3/Mn3O4为氧载体,依据Gibbs自由能最小化原理,利用Aspen Plus对该集成系统进行模拟研究。结果表明,当还...利用化学链制氧(chemical looping air separation,CLAS)取代传统空气分离制氧技术,提出了基于化学链制氧的煤气化集成系统。以Mn2O3/Mn3O4为氧载体,依据Gibbs自由能最小化原理,利用Aspen Plus对该集成系统进行模拟研究。结果表明,当还原温度高于840℃时,还原程度和粗煤气温度不随还原温度增加而发生明显变化,H2、CO和CH4流量及含量变化趋势较平缓,冷煤气效率为80%左右;随CO2循环比增大,水蒸气用量逐渐减少,粗煤气中H2流量和含量降低,CO流量和含量升高,CH4流量和含量基本不变,冷煤气效率升高,粗煤气温度降低。气化压力变化对粗煤气中H2、CO和CH4流量和含量无明显影响,气化压力升高会降低冷煤气效率,提高粗煤气温度。展开更多
基金supported by the National Natural Science Foundation of China(NSFC Grant No. 51706168)
文摘The complex reaction system of the coal gasification coupling C1 reaction was analyzed based on the principles of thermodynamics. The results show that an increase in the temperature is beneficial to the generation of hydrocarbons with high carbon-atom contents, in which the alkane yield is higher than the alkene yield. The complex reaction system consisting of C, H_2O, CO, CO2, H_2, C_2H_4, C_3H_6 and C_4H_8 was studied, and the obtained results indicated that when the maximum mole fraction content of C_2―C4 olefins was regarded as the optimized objective function, the optimum temperature was approximately 648 K, the pressure was 0.1 MPa, the feed ratio was approximately 0.6, and the maximum mole fraction content of C_2―C_4 olefins was approximately 28.24%. The thermodynamic simulation and calculation of the complex reaction system can provide a basis for the determination and optimization of actual process conditions and are therefore of great theoretical and practical significance.
文摘The partial coal gasification air pre-heating coal-fired combined cycle (PGACC) is a cleaning coal power system, which integrates the coal gasification technology, circulating fluidized bed technology, and combined cycle technology. It has high efficiency and simple construction, and is a new selection of the cleaning coal power systems. A thermodynamic analysis of the PGACC is carried out. The effects of coal gasifying rate, pre-heating air temperature, and coal gas temperature on the performances of the power system are studied. In order to repower the power plant rated 100 MW by using the PGACC, a conceptual design is suggested. The computational results show that the PGACC is feasible for modernizing the old steam power plants and building the new cleaning power plants.
文摘利用化学链制氧(chemical looping air separation,CLAS)取代传统空气分离制氧技术,提出了基于化学链制氧的煤气化集成系统。以Mn2O3/Mn3O4为氧载体,依据Gibbs自由能最小化原理,利用Aspen Plus对该集成系统进行模拟研究。结果表明,当还原温度高于840℃时,还原程度和粗煤气温度不随还原温度增加而发生明显变化,H2、CO和CH4流量及含量变化趋势较平缓,冷煤气效率为80%左右;随CO2循环比增大,水蒸气用量逐渐减少,粗煤气中H2流量和含量降低,CO流量和含量升高,CH4流量和含量基本不变,冷煤气效率升高,粗煤气温度降低。气化压力变化对粗煤气中H2、CO和CH4流量和含量无明显影响,气化压力升高会降低冷煤气效率,提高粗煤气温度。
