Translated Abstract
Energy system based on the traditional fossil fuel promotes the rapid development of world economy and also leads to serious energy crisis and environmental degradation. Energy shortage and environmental pollution have become the most serious problem the world faced. Development and utilization of renewable energy, industrial waste heat and other low grade heat sources can not only reduce the consumption of conventional energy, improve energy efficiency but also alleviate environmental thermal pollution. As the traditional steam Rankine cycle is no longer applicable in the utilization of low grade heat sources, the low grade heat source power generation system using non-conventional working fluid is proposed which can convert the low grade heat sources into electricity power efficiently. Therefore, the theoretical and experimental research of low grade heat source power generation technology, meet the national strategy of sustainable development and have important practical significance and engineering application value.
The thermodynamic mathematical model of Kalina power cycle system is established in this paper. The effects of turbine inlet temperature, turbine inlet pressure and the concentration of the basic solution on the net power output, thermal efficiency and exergy efficiency are evaluated. The effect of the regenerator on the performance of the Kalina power cycle is also discussed. The performance of Kalina cycle and regenerative Kalina cycleare compared under different thermal conditions.
For the practical application of Kalina power cycle system, the economics model of Kalina cycle is established. The effects of turbine inlet temperature, turbine inlet pressure and the concentration of the basic solution on the system cost, the cost of the heat exchanger and the cost per unit power are analyzed. Multi-objective optimization of the Kalina power cycle system with maximizing the exergy efficiency and minimizing the cost per power as the objective functions is carried out. Results show that regenerative Kalina cycle system ismore suitable for operation under high temperature and high pressure, too low concentration of the basic solution could affect the comprehensive performance of the Kalina cycle and regnerative Kalina cycle system .
ORC power system with different mixture working fluid is compared under various turbine inlet pressure and temperature and the thermodynamic performance of ORC is very different. The thermal efficiency and exergy efficiency of the system are improved by adding the regenerator while the net output power system is unchanged. As ORC is wildly used, the performance of ORC and supercritical CO2 is analyzed and compared in term of five thermo-economic indexs. The results show that the ORC working with R600a yields the maximum net power of 204.86kW while the highest thermal and exergy efficiencies are obtained by R601 which are 13.8% and 56.6%, respectively. The system thermal efficiency, exergy efficiency, the net power of the supercritical CO2 cycle and the system cost are all increased with addition of the regenerator, and with the turbine inlet pressure increasing the effect of the regenerator on the performance of the system recedes.
The low grade heat ORC system working with R123 is experimentally evaluated to provide support for the practical application of ORC. The performance of the ORC under different heat sources and R123 mass flow rate is analyzed. The experimental data show that with increasing heat source temperature and R123 mass flow rate, the turbine inlet pressure and rotation speed both increase. The output power of the experimental system could reach 6.07kW, the turbine efficiency could reach 58.53%. It also indicates that with increasing of heat source temperature and decrease of R123 mass flow rate the effect of regenerator on the system performance enhances and recedes, respectively. The thermo-economic performance of low grade heat power cycle and the thermal performance of the ORC are evaluated in theoretical analysis and experimental test, respectively. It is useful to improve the utilization efficiency of renewable energy and industry west heat, extend the practical application of the low grade heat power cycle and to relieve the energy and environmental problems. The work may have significant academic and engineering application value.
Translated Keyword
[Kalina Cycle Thermo-economic Analysis Mixture Working Fluid Parameter Optimization Experimental Test]
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