The Experts below are selected from a list of 288 Experts worldwide ranked by ideXlab platform
Duane E. Thompson - One of the best experts on this subject based on the ideXlab platform.
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DEVELOPMENT OF A PC-BASED DATA ACQUISITION SYSTEM FOR PERFUMNCE WNITORING ON AN 81-MEGAWATT Steam Cycle
1991Co-Authors: Duane E. ThompsonAbstract:A computer-based performance monitoring system has been successfully developed and implemented on an 81-megawatt Steam Cycle generating unit. This paper presents the instrument, data acquisition, computer, and software requirements for the system. This PC-based system was designed in such a manner that it is transparent to the unit's existing control scheme. Data from this system permits the setting of operating limits to avoid ongoing problems of turbine blade damage.
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Development of a PC-based data acquisition system for performance monitoring on an 81 megawatt Steam Cycle electric power generating unit
IEEE Transactions on Energy Conversion, 1991Co-Authors: A. Domijan, Duane E. ThompsonAbstract:A computer-based performance monitoring system has been successfully developed and implemented on an 81 MW Steam Cycle generating unit. The instrument, data acquisition, computer, and software requirements for the system are discussed. This PC-based system was designed in such a manner that it is transparent to the unit's existing control scheme. Data from this system permits the setting of operating limits to avoid ongoing problems of turbine blade damage.
A. R. Kvrivishvili - One of the best experts on this subject based on the ideXlab platform.
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High-temperature turbocompressor set of combined Steam-Cycle power units
2008 Third International Forum on Strategic Technologies, 2008Co-Authors: A. R. KvrivishviliAbstract:The prospects of a creation of the high-temperature coal-fired combined Steam-Cycle power units which operate similarly to combined Cycle plants, but use superheated Steam at pressure about 1 MPa instead of gas in the upper Cycle (implementing the Field-Baranovsky Cycle), are considered in the article. The calculation results for the high-temperature turbocompressor set in the power range from 30 to 100 MW are submitted.
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Design figures of high-temperature low-pressure combined Steam-Cycle power unit
Thermophysics and Aeromechanics, 2007Co-Authors: A. R. KvrivishviliAbstract:The scheme and Cycle of a promising highly economic coal-dust combined Steam-Cycle power unit are presented. The flow-rate, thermodynamic, and design figures of high-temperature sets (a coal-dust boiler and a high-temperature Steam turbine) are considered.
Yongping Yang - One of the best experts on this subject based on the ideXlab platform.
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parametric analysis and process optimization of Steam Cycle in double reheat ultra supercritical power plants
Applied Thermal Engineering, 2016Co-Authors: Luyao Zhou, Gang Xu, Shifei Zhao, Cheng Xu, Yongping YangAbstract:Abstract Parametric analysis and process optimization of Steam Cycle in double reheat ultra-supercritical power plants were performed in this study. Thermal and economic analyses were presented to reveal the benefits brought from the parametric analysis and process optimization. Parametric analysis of reheat pressure was firstly carried out to improve thermal performance of the double reheat Steam Cycle with eight-stage regenerative heaters. An optimized process of Steam Cycle with ten-stage regenerative heaters was put forward to further improve thermal performance of the double reheat power plant. The results showed that the power generation efficiency of the double reheat power plant could increase by 0.49 percentage point by parametric and process optimization. The economic analysis revealed that the cost of electricity of the double reheat power plant with both optimized process and parameters will decrease from 49.55 $/MWh to 49.07 $/MWh. This study could indicate that parametric analysis and process optimization of the Steam Cycle can both improve thermal and economic performances of double reheat ultra-supercritical power plants.
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an improved configuration of lignite pre drying using a supplementary Steam Cycle in a lignite fired supercritical power plant
Applied Energy, 2015Co-Authors: Luyao Zhou, Gang Xu, Shifei Zhao, Cheng Xu, Yongping Yang, Dongke ZhangAbstract:A novel concept of improved configuration of lignite pre-drying using a supplementary Steam Cycle incorporated in a lignite fired supercritical power plant was proposed in this study. Differing from the conventional lignite pre-drying power plant configuration, in this lignite pre-drying power plant (LPDPP) concept, the Steam bleeds for the dryer and some regenerative heaters (RHs) are redirected from the high pressure turbines and low pressure turbines through a separate turbine named the Regenerative-turbine (R-turbine). With the R-turbine in place, the degree of super-heating of the bleeds for the dryer and for RH3–RH5 is significantly reduced, thus leading to a reduction in the heat transfer temperature difference and exergy destruction rate. The net energy efficiency and the economic benefits of the proposed LPDPP are also enhanced as compared to the conventional configuration. The analysis showed that, for a 600MW supercritical LPDPP, the exergy destruction of the dryer could be reduced from 14.23MWth in the conventional configuration to 13.25MWth in the proposed design. The net energy efficiency could be further improved by 0.3 percentages points with a heat rate reduction of approximately 59.4kJ/kWh. The net economic benefit of the proposed LPDPP could reach $47.6M per year, which is $0.9M greater than that of the conventional lignite pre-drying unit.
Janusz Badur - One of the best experts on this subject based on the ideXlab platform.
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on low grade waste heat utilization from a supercritical Steam power plant using an orc bottoming Cycle coupled with two sources of heat
Energy Conversion and Management, 2017Co-Authors: Pawel Ziolkowski, Tomasz Kowalczyk, Sebastian Kornet, Janusz BadurAbstract:Abstract This paper analyzes a waste heat recovery system based on a binary vapor Cycle composed of an organic Rankine Cycle (ORC) bottoming a supercritical Steam Cycle. The organic Rankine Cycle is supplied by two heat sources. The first one is waste heat from a Steam boiler, which condenses flue gases to 200 MWt at 90 °C and preheats the fluid with a low boiling point. The second one is a Steam condenser, which also acts as a low-boiling-point fluid vapor generator. Steam condensation temperatures was tested in the range 55–115 °C. Usage of a low-boiling-point fluid instead of Steam in range of the low temperature (below 100 °C) has several advantages. One advantage is the possibility for the effective utilization of a large amount of low-grade waste heat from a supercritical Steam Cycle. For the most efficient configuration, 22.92 MW of additional electrical energy is generated. The thermal efficiency of the waste heat recovery system is 11.46%, which is 71.75% of the Carnot efficiency. Usage of an organic Rankine Cycle for bottoming the supercritical Steam Cycle also provides cubature reduction of the power plant. For the most efficient case, a Steam volume flow at the new Steam turbine outlet is reduced by 88% compared to a reference stream turbine. The volume flow at the ORC turbine outflow is reduced by 54%. Numerical analyses of the thermodynamic Cycles, before and after modifications, are carried out using computational flow mechanics, mainly, with in-house code.
S Ali M Moosavian - One of the best experts on this subject based on the ideXlab platform.
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introducing a hybrid multi generation fuel cell system hydrogen production and cryogenic co2 capturing process
Chemical Engineering and Processing, 2017Co-Authors: Mehdi Mehrpooya, Cyrus Rahbari, S Ali M MoosavianAbstract:Abstract A combined system containing molten carbonate fuel cell power plant, coal gasification, hydrogen production cryogenic CO 2 capture, Rankine Steam Cycle and ammonia-water absorption refrigeration system is introduced and analyzed. In this process, power, heat and cooling are produced. An electrochemical model is developed to validate the experimental results of the fuel cell. In this system at first coal burn with oxygen and produce synthesis gas which is primary fuel for molten carbonate fuel cell and hydrogen production. Outlet gases which contain carbon dioxide are sent to the cryogenic CO 2 capture system and hydrogen is separated from CO 2 . Effect of key parameters on performance of the process is investigated. The power output from the system is 6.55 MW which 6 MW is gained from the fuel cell and 0.55 MW from the heat recovery and Steam Cycle. Also, this process produce 90 kmol/h hydrogen and 90% of the produced CO 2 is captured. Electrical efficiency of the hybrid system is 58% (LHV). Refrigeration duty (−30 °C) and the recovered heat are 101.2 kW and 22.11 kW respectively.
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optimal design of solid oxide fuel cell ammonia water single effect absorption Cycle and rankine Steam Cycle hybrid system
Journal of Power Sources, 2016Co-Authors: Mehdi Mehrpooya, Hossein Dehghani, S Ali M MoosavianAbstract:Abstract A combined system containing solid oxide fuel cell-gas turbine power plant, Rankine Steam Cycle and ammonia-water absorption refrigeration system is introduced and analyzed. In this process, power, heat and cooling are produced. Energy and exergy analyses along with the economic factors are used to distinguish optimum operating point of the system. The developed electrochemical model of the fuel cell is validated with experimental results. Thermodynamic package and main parameters of the absorption refrigeration system are validated. The power output of the system is 500 kW. An optimization problem is defined in order to finding the optimal operating point. Decision variables are current density, temperature of the exhaust gases from the boiler, Steam turbine pressure (high and medium), generator temperature and consumed cooling water. Results indicate that electrical efficiency of the combined system is 62.4% (LHV). Produced refrigeration (at −10 °C) and heat recovery are 101 kW and 22.1 kW respectively. Investment cost for the combined system (without absorption Cycle) is about 2917$ kW −1 .