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Binary Cycle

The Experts below are selected from a list of 246 Experts worldwide ranked by ideXlab platform

Chuhua Zhang – 1st expert on this subject based on the ideXlab platform

  • sensitivity analysis of system parameters on the performance of the organic rankine Cycle system for Binary Cycle geothermal power plants
    Applied Thermal Engineering, 2014
    Co-Authors: Xing Wang, Chuhua Zhang

    Abstract:

    Abstract The main purpose of this paper is to analyze the sensitivity of system parameters to the performance of the Organic Rankine Cycle (ORC) system quantitatively. A thermodynamic model of the ORC system for BinaryCycle geothermal power plants has been developed and verified. The system parameters, such as working fluid, superheat temperature, pinch temperature difference in evaporator and condenser, evaporating temperature, the isentropic efficiencies of the Cycle pump and radial inflow turbine are selected as six factors for orthogonal design. The order of factors sensitivity on performance indices of the net power output of the ORC system, the thermal efficiency, the size parameter of radial inflow turbine, the power decrease factor of the pump and the total heat transfer capacity are determined by the range obtained from the orthogonal design. At different geothermal temperatures, the ranges of the six factors corresponding to performance indices are analyzed respectively. The results show that the geothermal temperature influences the range of the factors to the net power output, SP factor of radial inflow turbine, and the total heat transfer capacity, but it has no effect for the range of the factors for the thermal efficiency and the power decrease factor of the pump. The evaporating temperature is always the primary or secondary factor that influence the thermodynamic and economic performance of the ORC system. This study would provide useful references for determining the proper design variables in the performance optimization of the ORC system at different geothermal temperatures.

  • Sensitivity analysis of system parameters on the performance of the Organic Rankine Cycle system for BinaryCycle geothermal power plants
    Applied Thermal Engineering, 2014
    Co-Authors: Xiaomin Liu, Xing Wang, Chuhua Zhang

    Abstract:

    The main purpose of this paper is to analyze the sensitivity of system parameters to the performance of the Organic Rankine Cycle (ORC) system quantitatively. A thermodynamic model of the ORC system for BinaryCycle geothermal power plants has been developed and verified. The system parameters, such as working fluid, superheat temperature, pinch temperature difference in evaporator and condenser, evaporating temperature, the isentropic efficiencies of the Cycle pump and radial inflow turbine are selected as six factors for orthogonal design. The order of factors sensitivity on performance indices of the net power output of the ORC system, the thermal efficiency, the size parameter of radial inflow turbine, the power decrease factor of the pump and the total heat transfer capacity are determined by the range obtained from the orthogonal design. At different geothermal temperatures, the ranges of the six factors corresponding to performance indices are analyzed respectively. The results show that the geothermal temperature influences the range of the factors to the net power output, SP factor of radial inflow turbine, and the total heat transfer capacity, but it has no effect for the range of the factors for the thermal efficiency and the power decrease factor of the pump. The evaporating temperature is always the primary or secondary factor that influence the thermodynamic and economic performance of the ORC system. This study would provide useful references for determining the proper design variables in the performance optimization of the ORC system at different geothermal temperatures. © 2014 Elsevier Ltd. All rights reserved.

  • Performance Analysis of Organic Rankine Cycle With Preliminary Design of Radial Turbo Expander for BinaryCycle Geothermal Plants
    Journal of Engineering for Gas Turbines and Power-transactions of The Asme, 2013
    Co-Authors: Xing Wang, Chuhua Zhang

    Abstract:

    In order to produce less emission of greenhouse gases, many studies have been done on the BinaryCycle geothermal power plant to obtain better performance. The radial turbo expanders play an important role in the performance of the organic rankine Cycle (ORC) for BinaryCycle geothermal plants. However, few studies have investigated the effect of parameters of radial turbo expanders on the performance of the ORC. In this paper, a new thermodynamic model of the ORC coupled with the preliminary design of radial turbo expanders is developed. The effects of geothermal water temperature on the ORC performance parameters, such as power output and thermal efficiency are investigated by using the proposed thermodynamic model. The variation of radial turbo expanders’ parameters, such as specific rotational speed with geothermal water temperature is revealed. In the present study, the reasonable efficiency of radial turbo expanders by using the preliminary design is adopted to analyze the performance of the ORC, and an accurate reference about the effect of geothermal source on the parameters of radial turbo expanders is obtained.

Xing Wang – 2nd expert on this subject based on the ideXlab platform

  • thermo economic analysis and optimization selection of orc system configurations for low temperature Binary Cycle geothermal plant
    Applied Thermal Engineering, 2017
    Co-Authors: Luona Yang, Xing Wang

    Abstract:

    Abstract Multi-objective programming is used to analyze the performance of different organic Rankine Cycle (ORC) plant layouts with different working fluids for low temperature BinaryCycle geothermal plant. The studied results show that for the considered ORC plant layouts, the optimal overall performance indices increase with the geothermal temperature increasing. For a specific working fluid, the optimal ORC system for overall performance always remains unchanged despite the increase in the geothermal temperature. The optimal schemes of ORC systems vary with the performance indices of ORC system. The optimal scheme for comprehensive performance index is simple Cycle with R123 when the geothermal temperature increases from 80 °C to 95 °C. The optimal scheme for thermal efficiency is regenerative Cycle with R123, while the optimal scheme for capital cost is superheated Cycle with R123. For the work output and exergy efficiency, the optimal scheme is superheated Cycle with R152a when the geothermal temperature varies from 80 °C to 85 °C, while the scheme of superheated Cycle with R134a is better for work output and exergy efficiency when the geothermal temperature is greater than 90 °C. This study provides useful references for the researchers selecting the optimal configuration of ORC system for low temperature BinaryCycle geothermal plant.

  • sensitivity analysis of system parameters on the performance of the organic rankine Cycle system for Binary Cycle geothermal power plants
    Applied Thermal Engineering, 2014
    Co-Authors: Xing Wang, Chuhua Zhang

    Abstract:

    Abstract The main purpose of this paper is to analyze the sensitivity of system parameters to the performance of the Organic Rankine Cycle (ORC) system quantitatively. A thermodynamic model of the ORC system for BinaryCycle geothermal power plants has been developed and verified. The system parameters, such as working fluid, superheat temperature, pinch temperature difference in evaporator and condenser, evaporating temperature, the isentropic efficiencies of the Cycle pump and radial inflow turbine are selected as six factors for orthogonal design. The order of factors sensitivity on performance indices of the net power output of the ORC system, the thermal efficiency, the size parameter of radial inflow turbine, the power decrease factor of the pump and the total heat transfer capacity are determined by the range obtained from the orthogonal design. At different geothermal temperatures, the ranges of the six factors corresponding to performance indices are analyzed respectively. The results show that the geothermal temperature influences the range of the factors to the net power output, SP factor of radial inflow turbine, and the total heat transfer capacity, but it has no effect for the range of the factors for the thermal efficiency and the power decrease factor of the pump. The evaporating temperature is always the primary or secondary factor that influence the thermodynamic and economic performance of the ORC system. This study would provide useful references for determining the proper design variables in the performance optimization of the ORC system at different geothermal temperatures.

  • Sensitivity analysis of system parameters on the performance of the Organic Rankine Cycle system for BinaryCycle geothermal power plants
    Applied Thermal Engineering, 2014
    Co-Authors: Xiaomin Liu, Xing Wang, Chuhua Zhang

    Abstract:

    The main purpose of this paper is to analyze the sensitivity of system parameters to the performance of the Organic Rankine Cycle (ORC) system quantitatively. A thermodynamic model of the ORC system for BinaryCycle geothermal power plants has been developed and verified. The system parameters, such as working fluid, superheat temperature, pinch temperature difference in evaporator and condenser, evaporating temperature, the isentropic efficiencies of the Cycle pump and radial inflow turbine are selected as six factors for orthogonal design. The order of factors sensitivity on performance indices of the net power output of the ORC system, the thermal efficiency, the size parameter of radial inflow turbine, the power decrease factor of the pump and the total heat transfer capacity are determined by the range obtained from the orthogonal design. At different geothermal temperatures, the ranges of the six factors corresponding to performance indices are analyzed respectively. The results show that the geothermal temperature influences the range of the factors to the net power output, SP factor of radial inflow turbine, and the total heat transfer capacity, but it has no effect for the range of the factors for the thermal efficiency and the power decrease factor of the pump. The evaporating temperature is always the primary or secondary factor that influence the thermodynamic and economic performance of the ORC system. This study would provide useful references for determining the proper design variables in the performance optimization of the ORC system at different geothermal temperatures. © 2014 Elsevier Ltd. All rights reserved.

A. A. Shipkov – 3rd expert on this subject based on the ideXlab platform

  • A Combined BinaryCycle Geothermal Power Plant with a Secondary Flash Steam Superheating System: Choice of Optimal Working Fluids
    Thermal Engineering, 2019
    Co-Authors: G. V. Tomarov, A. A. Shipkov

    Abstract:

    —The article presents the results from numerically modeling the process circuit of a combined BinaryCycle double-flash geothermal power plant (GeoPPs) with the use of secondary flash steam superheating by means of a hydrogen–oxygen steam generator. Geothermal heat carrier from substandard wells of the Mutnovsk geothermal field, as well as separated steam and waste brine from the Mutnovsk GeoPP, were taken as the primary heat source. Numerical investigation results have shown that the application of secondary flash steam superheating by means of a hydrogen–oxygen steam generator makes it possible to increase the steam turbine’s power output and its flow path efficiency owing to the steam wetness reduced by more than a factor of two. In addition, reduced steam wetness helps prevent erosion damage to the last-stage turbine rotor blades. Data on the effect that the use of different organic substances has on the efficiency and power output of the Binary installation and of the GeoPP as a whole are given. Optimization investigations have shown that the highest power output and efficiency values of the Binary installation used as part of a combined BinaryCycle GeoPP at the lowest specific brine flowrate are achieved in using organic substances from the groups of nontoxic fire- and flame-proof (R-31-10 and RC-318) and low-toxic fire- and flame-proof ones (R-227ea, R-236fa, R1318, and R-134a) as working fluids. It has been established that the highest power output values of a combined BinaryCycle double-flash GeoPP with secondary flash steam superheating by means of a hydrogen–oxygen steam generator are achieved in using the organic working fluids R-31-10, R‑227ea, and RC-318. In so doing, the optimum design pressure in the expander-separator at which the highest efficiency and power output of the studied GeoPP are obtained makes 0.47 MPa. In solving optimization problems on selecting the working fluids for Binary combined-Cycle GeoPP installations, it is proposed to use multiaxial composite diagrams of the relative values of geothermal power plant parameters and characteristics. An example of drawing a multiaxial composite diagram for the relative values of parameters and characteristics for a combined BinaryCycle GeoPP for the R-290, R-31-10, R-32, and RC-318 working fluids is given. The numerical investigation results can be used in designing new and modernizing the operating GeoPPs that use steam geothermal sources.

  • Optimization Investigations of a Combined BinaryCycle Geothermal Power Plant with Two Separation Pressures and Flashed Steam Superheating Using a Hydrogen–Oxygen Steam Generator
    Thermal Engineering, 2019
    Co-Authors: G. V. Tomarov, V. I. Borzenko, A. A. Shipkov

    Abstract:

    —The article considers the specific features of and prospects for improving the efficiency of geothermal power plants (GeoPPs) that use a steam–water mixture from geothermal fields and steam superheating as an energy source. The process flow diagram of a combined BinaryCycle GeoPP with two separation pressures and flashed steam superheating with the use of a hydrogen–oxygen steam generator is proposed. The advisability of using a separator downstream of the high-pressure section for decreasing the steam moisture at the turbine condenser inlet is substantiated. The article also presents the results from numerical optimization investigations of the effect that the choice of organic working fluid has on the efficiency, safety, and environmental characteristics of the Binary installation used as part of a combined-Cycle GeoPP. The following groups of organic substances as possible candidates for use as working fluid are considered: nontoxic, nonflammable, and nonexplosive ones (group I); low-toxic, nonflammable, and nonexplosive ones (group II); nontoxic inflammable ones (group III); and low-toxic, inflammable, and explosive ones (group IV). Typical dependences characterizing the effect that the pressure in the expander and the saturation pressure in the evaporator have on the Binary turbine net power output, on the specific flowrate of separated geothermal brine per unit power capacity, on the Binary Cycle efficiency, and on the GeoPP efficiency as a whole are shown taking as examples the use of cyclobutane and octafluoropropane as a working fluid. For a few working fluids, the existence of extremes in the above-mentioned dependences is established, which determine the Binary installation optimal power values and the minimal geothermal brine specific flowrate. Based on the numerical analysis results, limitations are imposed on the admissible maximum and minimum pressure values in the Binary circuit. Bar charts of calculated process characteristics influencing the Binary turbine flow path’s design and efficiency are plotted. A priority (according to the maximum net power output criterion) list of working fluids relating to the group of environmentally friendly organic substances for the combined-Cycle GeoPP Binary installation with flashed steam superheating taking into account process-related limitations is drawn up.

  • Modern geothermal power: Binary Cycle geothermal power plants
    Thermal Engineering, 2017
    Co-Authors: G. V. Tomarov, A. A. Shipkov

    Abstract:

    ⎯In the second part of the review of modern geothermal power plant technologies and equipment, a role, a usage scale, and features of application of Binary Cycle plants in the geothermal economy are consid-ered. Data on the use of low-boiling fluids, their impact on thermal parameters and performance of geother-mal Binary power units are presented. A retrospective of the use of various low-boiling fluids in industrial Binary power units in the world since 1965 is shown. It is noted that the current generating capacity of Binary power units running on hydrocarbons is equal to approximately 82.7% of the total installed capacity of all the Binary power units in the world. At the same time over the past 5 years, the total installed capacity of geother-mal Binary power units in 25 countries increased by more than 50%, reaching nearly 1800 MW (hereinafter electric power is indicated), by 2015. A vast majority of the existing Binary power plants recovers heat of geo-thermal fluid in the range of 100–200°C. Binary Cycle power plants have an average unit capacity of 6.3 MW, 30.4 MW at single-flash power plants, 37.4 MW at double-flash plants, and 45.4 MW at power plants working on superheated steam. The largest Binary Cycle geothermal power plants (GeoPP) with an installed capacity of over 60 MW are in operation in the United States and the Philippines. In most cases, Binary plants are involved in the production process together with a steam Cycle. Requirements to the fluid ensuring safety, reliability, and efficiency of Binary power plants using heat of geothermal fluid are determined, and differ-ences and features of their technological processes are shown. Application of Binary Cycle plants in the tech-nological process of combined GeoPPs makes it possible to recover geothermal fluid more efficiently. Fea-tures and advantages of Binary Cycle plants using multiple fluids, including a Kalina Cycle, are analyzed. Technical characteristics of Binary Cycle plants produced by various manufacturers are considered, and data on the Russian pilot Binary geothermal power unit in the Pauzhetskaya GeoPP is provided. Expediency of the use of Binary Cycle plants for autonomous power supply and energy extension of existing GeoPPs without drilling extra wells and in flowsheets of newly designed combined GeoPPs are noted.