Integration And Mechanism Of Chemical Looping Combustion With Chemical Intercooling And Methanol Reforming With Multi Production

Harmonious development of energy resource, environment and economy is the important forward direction of energy research in 21^st century. Exploring the new principle of energy transformation and utilization and innovating the new thermodynamic cycle are the main research directions of the generalized total energy system with gas turbine in the future. Meanwhile, CO₂ which emissions to atmospheric form fossil fuel combustion has caused severe environmental pollution. The global climate change caused by greenhouse gas (CO₂) is one of the hot spots and most difficult energy and environmental issues in the future. Supported by the National Natural Science Foundation of China, from the mechanism of the key process, system integration and technology route, the chemical looping combustion (CLC) with zero penalty to capture CO₂ is studied, and chemical intercooling CLC systems are proposed, and also, the development of CO₂ capture technology are predicted, technology route suitable for China is suggested.To reveal the mechanism of energy transformation in CLC, the new principle of cascade utilization of chemical energy of carbon fuel is proposed and investigated fundamentally. The equation of cascaded utilization of chemical energy, physical energy and energy level for processes integration that includes reduce reaction and oxygen reaction is built. According to the energy level equation, the interactions among chemical exergy of fuel, the availability of work in chemical reaction, physical exergy are identified, and also disclosed by energy level. Based on these fundamentals, the indirect combustion of methanol is proposed in which the reduce reaction in CLC is coupled with the low energy level of physical energy. The characteristics about the indirect combustion of methanol are investigated.According to the above new principle, the gas turbine combined cycle with the integration of low-temperature waste heat and chemical looping is proposed. The analysis of the system is based on the energy balance and exergy balance, and the cascade utilization of chemical energy in CLC is identified. The EUD analysis is also adopted, and the key points of the improvement of system performance are indicated. The characteristics of the system are also studied, and there is an optimized intercooling pressure, at which the system has the best thermal efficiency. The studies also show that the chemical intercooling CLC has high performance with zero penalty of capture CO₂. Aiming at a large of high quality fuel is consumed in the conventional reforming process of methanol, a kind of methanol reforming energy system using low energy level of physical energy with hydrogen and electricity production is proposed. By the use of EUD analysis, and compared with conventional system with hydrogen production, the reasons of higher thermodynamic performance of the new system is revealed. The characteristics of the system are studied and the effect of key parameters to the system is analyzed. The mechanism of complementary utilization of methanol and low energy level physical energy is revealed.Based on sustainable energy development strategy of China, by the use of the MESSAGE model, Scenarios of energy supply system of chemical intercooling CLC are investigated. Meanwhile, the Polygeneration system is also included, because of the energy resource structure with coal. Through scenarios comparison of different CO₂ control technology pathways, it was pointed out that the CLC can meet harmonious development of energy, economy and environment. It is expected to be promised pathway suitable for China for CO₂ mitigation. Furthermore, the existing CO₂ technology cannot solve the coordination of energy, economy and environment in future, so the development of new advanced CO₂ technologies is needed for China.