Comparison of Hybrid Configurations of Power Generation and Refrigeration Cycles Using Ammonia-Water Mixture

2005 ◽  
Author(s):  
Keisuke Takeshita ◽  
Masao Tomizawa ◽  
Akinori Nagashima ◽  
Yoshiharu Amano ◽  
Takumi Hashizume
Keyword(s):  
Power Generation ◽  
Mass Fraction ◽  
Performance Comparison ◽  
Water Mixture ◽  
Ammonia Water ◽  
Generation Cycle ◽  
Hybrid Configuration ◽  
Absorption Refrigerator ◽  
Performance Gains ◽  
Power Generation Cycle

This paper describes performance comparison of two types of hybrid configuration of power generation and refrigeration cycles using ammonia-water mixture by simulation calculation. Difference between two configurations is the ammonia mass fraction of solution from the turbine system (power generation cycle) to the ammonia absorption refrigerator (refrigeration cycle). The newer configuration (configuration 2) supplies higher mass fraction solution to the refrigerator. As a result, both configurations show larger system net power than separate operations when the basic composition (the ammonia mass fraction of the evaporator in the turbine system) is 0.45 kg/kg. The performance gains of configuration 1 and 2 are 13.6% and 13.8%, respectively.

Flexible Heat-to-Power Ratio Co-Generation System With Ammonia-Water Mixture Cycles at Bottoming

2003 ◽  
Author(s):  
Keisuke Takeshita ◽  
Yoshiharu Amano ◽  
Takumi Hashizume ◽  
Akira Usui ◽  
Yoshiaki Tanzawa
Keyword(s):  
Working Fluid ◽  
Water Mixture ◽  
Power Ratio ◽  
System Configuration ◽  
Generation System ◽  
Ammonia Water ◽  
Cogeneration System ◽  
Ammonia Absorption ◽  
Hybrid Configuration ◽  
Absorption Refrigerator

This paper presents the experimental study of a unique cogeneration system which the authors call the “Advanced Co-Generation System (ACGS)”. It mainly consists of three turbine systems and an ammonia absorption refrigerator (AAR). The specialty of the ACGS is the bottoming stage employing an ammonia-water mixture (AWM) as the working fluid. First, the overall system configuration and some experimental results at the steady state are shown. The experimental investigation shows that the AWM bottoming cycles contribute to a higher efficiency of the system. An increase of 5–10% in electric power compared to a conventional co-generation system (CGS) is confirmed. Next, a hybrid configuration of the AWM turbine (AWMT) cycle and the AAR is investigated. A simulation model is constructed. The results of the simulation show that the hybrid configuration performs at about 14% higher efficiency.

Thermodynamic Analysis of a Combined Power and Water Production System

2010 ◽  
Author(s):  
S. Ehsan Shakib ◽  
Majid Amidpour ◽  
Cyrus Aghanajafi
Keyword(s):  
Power Generation ◽  
Water Cycle ◽  
Performance Ratio ◽  
Water Production ◽  
Exergy Destruction ◽  
Combined System ◽  
Dual Purpose ◽  
Destruction Rate ◽  
Generation Cycle ◽  
Power Generation Cycle

Most of the potable water and electricity are produced by dual purpose plants. Dual-purpose plants are the one that supplies heat for a thermal desalination unit and produces electricity for distribution to the electrical grid. In this paper a power plant is combined with a multi-effect evaporation thermal vapor compression (METVC) system. Compared with the most widely used (Multi Stage Flash) MSF desalination, METVC has more advantages. Then, energy and exergy analysis equations for desalination plant, power generation cycle, heat recovery steam generator and combined power and water cycle are developed and the results are presented. Results show by rising number of effect from 2 to 14, performance ratio, exergy efficiency and specific heat transfer area rise steadily. For combined system, the maximum and minimum values of exergy destruction rate are related to combustion chamber and desalination effects, respectively. Also, with increasing TIT, exergy destruction rate of power generation cycle decreases while the exergy destruction rate of METVC, especially thermo compressor, goes up and fresh water production reduces dramatically.

scholarly journals System of Comprehensive Energy-Efficient Utilization of Associated Petroleum Gas with Reduced Carbon Footprint in the Field Conditions

Energies ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4921 ◽  
Author(s):  
Valentin Morenov ◽  
Ekaterina Leusheva ◽  
George Buslaev ◽  
Ove T. Gudmestad
Keyword(s):  
Power Generation ◽  
Carbon Footprint ◽  
High Efficiency ◽  
Energy System ◽  
Gas Analysis ◽  
Energy Potential ◽  
Associated Petroleum Gas ◽  
Power Load ◽  
Generation Cycle ◽  
Power Generation Cycle

This paper considers the issue of associated petroleum gas utilization during hydrocarbon production in remote petroleum fields. Due to the depletion of conventional oil and gas deposits around the globe, production shifts to hard-to-recover resources, such as heavy and high-viscosity oil that requires a greater amount of energy to be recovered. At the same time, large quantities of associated petroleum gas are extracted along with the oil. The gas can be utilized as a fuel for power generation. However, even the application of combined power modes (combined heat and power and combined cooling heat and power) cannot guarantee full utilization of the associated petroleum gas. Analysis of the electrical and heat loads’ graphs of several oil fields revealed that the generated thermal energy could not always be fully used. To improve the efficiency of the fuel’s energy potential conversion, an energy system with a binary power generation cycle was developed, consisting of two power installations—a main gas microturbine and an auxiliary steam turbine unit designed to power the technological objects in accordance with the enterprise’s power load charts. To provide for the most complete utilization of associated petroleum gas, a gas-to-liquid system is introduced, which converts the rest of the gas into synthetic liquid hydrocarbons that are used at the field. Processing of gas into various products also lowers the carbon footprint of the petroleum production. Application of an energy system with a binary power generation cycle makes it possible to achieve an electrical efficiency up to 55%, at the same time maintaining high efficiency of consumers’ energy supply during the year. The utilization of the associated petroleum gas in the developed system can reach 100%.

Thermodynamic Analysis of Hydrogen Combustion Turbine Cycles

2001 ◽  
Author(s):  
Umberto Desideri ◽  
Piergiacomo Ercolani ◽  
Jinyue Yan
Keyword(s):  
Power Generation ◽  
Thermodynamic Analysis ◽  
Clean Energy ◽  
Energy System ◽  
Combined Cycle ◽  
World Energy ◽  
Generation Cycle ◽  
Set Up ◽  
Power Generation Cycle ◽  
Energy Network

The “International Clean Energy System Technology Utilizing Hydrogen (World Energy Network)”: WE-NET is a research program directed at the development of the technologies needed build a hydrogen-based energy conversion system. It proposes to set up a world energy network to convert renewable energy, such as hydropower and solar energy, into a secondary and transportable form to supply the demand centers, and to make possible the utilization of existing power generation, transportation, town gas, etc. Within the framework of this program Mitsubishi Heavy Industries, Hitachi and Westinghouse Power Corporation are working to develop an hydrogen-fueled combustion turbine system designed to meet the goals set by the WE-NET Program. The hydrogen–fueled power generation cycle will be able to satisfy the requirements of an efficiency based on the lower heating value higher than 70% and of reliability, availability and maintainability equivalent to current base-loaded natural gas-fired combined cycle. The use of hydrogen will eliminate emissions of CO2 and SOx and significantly reduce those of NOx. This paper presents a thermodynamic analysis of some concepts of hydrogen fuelled cycles which have been studied in the WE-NET program and makes a comparison of their performance.

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