Hongguang Jin

A new advanced power-generation system using chemical-looping combustion

A new type of power-generation system (called CLSA), with chemical-looping combustion, air saturation and based on energy-utilization diagrams (EUDs), is proposed. A loop of chemical reactions is substituted for conventional combustion and a process of saturation for air is introduced for the following purposes: (1) to reduce the exergy destruction caused by combustion and heat-exchange processes; (2) to separate CO2 easily from the exhaust gas of a gas turbine; (3) to recover the water used in this system. Exergy analysis of a model system indicates that the expected thermal power-plant efficiency could be as high as 55.1% (LHV). Simultaneously, the proposed system can be used to solve environmental problems by recovering and utilizing CO2 as a by-product.

Graphical exergy analysis of complex cycles

Advanced thermal power systems (i.e. the gas-steam combined cycle, the steam injected gas turbine cycle and the regenerative gas turbine cycle) are complex systems with a basic gas turbine cycle. They have been analyzed by using a graphical exergy analysis that generates energy-utilization diagrams (EUDs). Comparison of the EUDs shows that the recently advanced systems have potential for substantial improvements. Suggestions for future improvements are described.

Fundamental Study on a Novel Gas Turbine Cycle

It is important and necessary to develop a new technology for CO 2 capture with less or even no energy penalty to make a breakthrough in greenhouse gas abatement. Towards this objective, we have proposed a novel gas turbine power plant, which is not only to capture CO 2 in the stage of combustion, but also to increase thermal efficiency of the power plant. The chemical-looping combustor in the proposed system consists of a fuel reactor (fuel reacts with metal oxide) and an air reactor (the resulting metal reacts with oxygen in air). This new system requires no additional energy consumption for CO 2 separation (i.e., no energy penalty) and no CO 2 separation equipment. Here, we have identified several breakthrough points in the proposed system and summarized promising results from experimental investigation on the chemical-looping combustion.

Graphical exergy analysis of a new type of advanced cycle with saturated air

Abstract A new type of advanced cycle with saturated air called a gas turbine cycle with saturation for air (GTSA) is analyzed by graphical exergy methodology based on energy-utilization diagrams (EUDs). By comparing it with an advanced steam-injected gas turbine cycle (STIG), key features of the GTSA system are clarified. The model system may achieve an efficiency as high as 56%. It is about 8% more efficient than the STIG. In addition, some suggestions are pointed out for further research.