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Modular Geothermal Energy Recovery and Conversion
Published in Yatish T. Shah, Modular Systems for Energy and Fuel Recovery and Conversion, 2019
The study proposes a methodology for sizing a standardized, modular geothermal ORC power plant. Consequently, the system consists of six main components, namely evaporator, recuperator, condenser, fan, pump, and turbine. The recuperator helps maintain a high injection temperature; it increases thermal efficiency and reduces the thermal condenser load. The heat exchangers are represented by a counterflow shell/tube configuration, with working fluid flowing in the shell of the evaporators and in the tube of the air-cooled condensers. The pump is centrifugal with a variable speed drive. The turbine is equipped with nozzle vanes, which are also controlled with an electric drive. Isobutane was used as a working fluid in the system. Working fluid selection is an essential and initial step of the ORC design process, but it is not the main concern of this work. Isobutane was chosen because it has the highest energetic efficiency in medium wellhead temperature range [38], low global-warming potential, low ozone-depleting potential, and good market availability. A schematic of this type of binary geothermal plant is illustrated in Figure 9.2 [58].
Utility and Process System Optimization
Published in Albert Thumann, Scott Dunning, Plant Engineers and Managers Guide to Energy Conservation, 2020
The various names or designations applied to heat exchangers are partly an attempt to describe their function and partly the result of tradition within certain industries. For example, a recuperator is a heat exchanger which recovers waste heat from the exhaust gases of a furnace to heat the incoming air for combustion. This is the name used in both the steel and glass-making industries. The heat exchanger performing the same function in the steam generator of an electric power plant is termed an air preheater, and in the case of a gas turbine plant, a regenerator.
Waste Heat Recovery
Published in Albert Thumann, D. Paul Mehta, Handbook of Energy Engineering, 2020
The various names or designations applied to heat exchangers are partly an attempt to describe their function and partly the result of tradition within certain industries. For example, a recuperator is a heat exchanger which recovers waste heat from the exhaust gases of a furnace to heat the incoming air for combustion. This is the name used in both the steel and the glass making industries. The heat exchanger performing the same function in the steam generator of an electric power plant is termed an air preheater, and in the case of a gas turbine plant, a regenerator.
Modeling and simulation of biogas-fueled power system
Published in International Journal of Green Energy, 2019
Mohammed Saeed, Samaa Fawzy, Magdi El-Saadawi
The basic components of an MT generation system include compressor, turbine, recuperator, and permanent magnet synchronous generator with power electronics interfacing. MT operation is based on Brayton cycle. The choice of whether to use a single-shaft MT or two-shaft type is largely determined by the characteristics of the driven load. If the load speed is constant, as in the case of an electric generator, a single-shaft unit is often specified; an engine specifically designed for electric power generation would make use of a single-shaft configuration. An alternative, however, is the use of a two-shaft engine. If the load needs to be driven with varying speeds, two-shaft engines are advantageous. The inlet air is compressed in a radial compressor. This air is mixed with fuel in the combustor and burned. The hot burning gas is amplified in the turbine to produce rotating mechanical power to rotate the compressor and the electric generator. To increase the overall efficiency, an air-to-gas heat exchanger called recuperator is added. Without a recuperator the overall efficiency of an MT is 15 to 17%, whereas it can be increased to 33 to 37% with an 85% effective recuperator (Duan, Bournazou, and Kravaris 2017b). A schematic diagram of an MT system is illustrated in Figure 8 (Guda 2005b).
Recent Progress on High Temperature and High Pressure Heat Exchangers for Supercritical CO2 Power Generation and Conversion Systems
Published in Heat Transfer Engineering, 2023
Depending on operating conditions and heat exchanger performance, over 60% of the heat addition to the compressor discharge is achieved through recuperation, while the remaining is provided by the heat source [10]. The objectives of recuperator design are to maximize heat transfer efficiency, minimize pressure drop, and ensure even flow distribution. Challenges facing recuperators are the requirements to withstand high temperature and large pressure differentials, flow passage design to improve thermohydraulic performance and reduce pressure drop and need to reduce capital cost.