The Experts below are selected from a list of 66 Experts worldwide ranked by ideXlab platform
Sri Utami Handayani - One of the best experts on this subject based on the ideXlab platform.
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analisa efisiensi isentropik turbin uap pada pltu 1 jawa barat indramayu isentropic efficiency analysis on steam Turbine pltu 1 jawa barat indramayu
2015Co-Authors: Bayu Pamungkas, Sri Utami HandayaniAbstract:Turbin pada PLTU 1 Jawa Barat Indramayu telah dioperasikan sejak tahun 2011 sehingga dimungkinkan terjadi penurunan kinerja. Untuk mengetahui penurunan kinerja dilakukan perhitunan efisiensi dengan membandingkan daya aktual dan daya isentropik turbin. Analisa efisiensi dilakukan pada unit #2. Perhitungan dilakukan untuk mencari besarnya nilai efisiensi isentropik (ɳis ), daya aktual turbin (Pact), daya turbin isentropis (Pis). Data parameter yang dibutuhkan untuk perhitungan diambil dari komputer pemantau operasi di central control room dan data pada performance test. Dari analisa efisiensi isentropik turbin diketahui bahwa efisiensi turbin tekanan rendah turun dari 95,6% menjadi 54,5% seiring dengan kenaikan beban. Penurunan di turbin tekanan rendah terjadi akibat kenaikan flow sehingga dayanya berkurang. Pada turbin tekanan menengah terjadi kenaikan efisiensi dari 72% menjadi 90,5% karena adanya kenaikan tekanan uap yang masuk ke reheater. Pada turbin tekanan tinggi efisiensinya konstan sekitar 80%.Untuk analisa daya aktual terhadap beban diperoleh selisih sekitar 0,4%-1,5%, hal itu menunjukan bahwa performa turbin dan generator masih baik. Kata Kunci : Efisiensi Isentropik, Turbin Uap, PLTU. Steam Turbine in PLTU 1 Jawa Barat Indramayu has been operated since early 2011, therefore its performance may has decreased. Calculation of efficiency is needed to find out the decrease of performance by comparing between the actual power and isentropic power of steam Turbine. The object of analyzis is Turbine unit #2. Calculated performance indicator includes isentropic efficiency, actual power of steam Turbine and isentropic power of steam Turbine. Data of parameter required in calculation are obtained from operation monitoring computer in central control roo and data from performance test. From the analysis of isentropic efficiency, low pressure turbin efficiency decreased from 95,6% to 54,5% within the increase of unit load. This decrease is due to the increase of steam extraction flow that reduce power prodoced. Efficiency increase was found in intermediate pressure Turbine from 72% to 90,5% due to increase of pressure in reheating process. Efficiency of high pressure Turbine was found out constant. In comparation between actual power and unit load, a difference of 0,4%-1,5% shows that steam turbin and generator still in good condition. Keyword : Steam Turbine Isentropik Efficiency , Power .
Deren Sheng - One of the best experts on this subject based on the ideXlab platform.
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advanced exergoenvironmental evaluation for a coal fired power plant of near zero air pollutant emission
Applied Thermal Engineering, 2018Co-Authors: Xiliang Hong, Jianhong Chen, Hao Lyu, Deren ShengAbstract:Abstract Advanced exergy and exergoenvironmental analyses based on life cycle assessment (LCA) are conducted to an SCPP with and without dust, SO2 and NOX mitigation controls. The analyses show that environmental impacts of components are mainly caused by exergy destruction while combustion chamber (COM) still has great potential to reduce pollutant environmental impact reduced by 99.5% by near-zero air pollutant emission standards. Avoidable environmental impact within each component is endogenous other than most regenerative feedwater heaters. COM has the largest environmental impact of exergy destruction but lower avoidable part compared with superheat transfer (SH) including boiling process. Reheat transfer (RH) shows similar avoidable environmental impact but less exergy destruction in contrast with COM. Turbines play well in exergy efficiency and over 50% of environmental impact within Intermediate-Pressure Turbine (IP) can be avoided. Air preheater (APH) displays a higher avoidable environmental impact than condenser (CND) albeit lower exergy destruction. Pumps and fans have small environmental impacts with over 45% can be avoided. Most environmental impact related to pollutant formation is avoidable and endogenous except for wet flue gas desulfurization (WFGD) which imposes a negative environmental impact on other components. The specific environmental impact of electricity generation is higher than European.
Harry Brandt - One of the best experts on this subject based on the ideXlab platform.
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thermodynamic analysis of zero atmospheric emissions power plant
Journal of Engineering for Gas Turbines and Power-transactions of The Asme, 2004Co-Authors: Joel Martinezfrias, Ray J Smith, Harry BrandtAbstract:This paper presents a theoretical thermodynamic analysis of a zero-atmospheric emissions power plant. In this power plant, methane is combusted with oxygen in a gas generator to produce the working fluid for the Turbines. The combustion produces a gas mixture composed of steam and carbon dioxide. These gases drive multiple Turbines to produce electricity. The Turbine discharge gases pass to a condenser where water is captured. A stream of pure carbon dioxide then results that can be used for enhanced oil recovery or for sequestration. The analysis considers a complete power plant layout, including an air separation unit, compressors and intercoolers for oxygen and methane compression a gas generator three steam Turbines, a reheater, two preheaters, a condenser, and a pumping system to pump the carbon dioxide to the pressure required for sequestration. This analysis is based on a 400 MW electric power generating plant that uses Turbines that are currently under development by a U.S. Turbine manufacturer. The high-pressure Turbine operates at a temperature of 1089 K (1500°F) with uncooled blades, the Intermediate-Pressure Turbine operates at 1478 K (2200°F) with cooled blades and the low-pressure Turbine operates at 998 K (1336°F). The power plant has a net thermal efficiency of 46.5%. This efficiency is based on the lower healing value of methone, and includes the energy necessary for air separation and for carbon dioxide separation and sequestration.
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thermodynamic analysis of zero atmospheric emissions power plant
ASME 2002 International Mechanical Engineering Congress and Exposition, 2002Co-Authors: Joel Martinezfrias, Ray J Smith, Salvador M Aceves, Harry BrandtAbstract:This paper presents a thermodynamic analysis of a natural gas zero-atmospheric emissions power plant with a net electrical output of 400 MW. In this power plant, methane is combusted with oxygen in a gas generator to produce the working fluid for the Turbines. The combustion produces a gas mixture composed of steam and carbon dioxide. These gases drive multiple Turbines to produce electricity. The Turbine discharge gases pass to a condenser where water is captured as liquid and gaseous carbon dioxide is pumped from the system. The carbon dioxide can be economically conditioned for enhanced recovery of oil, or coal-bed methane, or for sequestration in a subterranean formation. The analysis considers a complete power plant layout, including an air separation unit, compressors and intercoolers for oxygen and methane compression, a gas generator, three steam Turbines, a reheater, a preheater, a condenser, and a carbon dioxide pumping system to pump the carbon dioxide to the pressure required for sequestration. The computer code is a powerful tool for estimating the efficiency of the plant, given different configurations and technologies. The efficiency of the power plant has been calculated over a wide range of conditions as a function of the two important power plant parameters of Turbine inlet temperature and Turbine isentropic efficiency. This simulation is based on a 400 MW electric power generating plant that uses Turbines that are currently under development by a U.S. Turbine manufacturer. The high-pressure Turbine would operate at a temperature of 1089 K (1500 °F) with uncooled blades, the Intermediate-Pressure Turbine would operate at 1478 K (2200 °F) with cooled blades and the low-pressure Turbine would operate at 998 K (1336 °F). The corresponding Turbine isentropic efficiencies for these three Turbines were taken as 90, 91 and 93 percent. With these operating conditions, the zero-atmospheric emissions electric power plant has a net thermal efficiency of 46.5%. This net thermal efficiency is based on the lower heating value of methane, and includes the energy necessary for air separation and for carbon dioxide separation and sequestration.Copyright © 2002 by ASME
Bayu Pamungkas - One of the best experts on this subject based on the ideXlab platform.
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analisa efisiensi isentropik turbin uap pada pltu 1 jawa barat indramayu isentropic efficiency analysis on steam Turbine pltu 1 jawa barat indramayu
2015Co-Authors: Bayu Pamungkas, Sri Utami HandayaniAbstract:Turbin pada PLTU 1 Jawa Barat Indramayu telah dioperasikan sejak tahun 2011 sehingga dimungkinkan terjadi penurunan kinerja. Untuk mengetahui penurunan kinerja dilakukan perhitunan efisiensi dengan membandingkan daya aktual dan daya isentropik turbin. Analisa efisiensi dilakukan pada unit #2. Perhitungan dilakukan untuk mencari besarnya nilai efisiensi isentropik (ɳis ), daya aktual turbin (Pact), daya turbin isentropis (Pis). Data parameter yang dibutuhkan untuk perhitungan diambil dari komputer pemantau operasi di central control room dan data pada performance test. Dari analisa efisiensi isentropik turbin diketahui bahwa efisiensi turbin tekanan rendah turun dari 95,6% menjadi 54,5% seiring dengan kenaikan beban. Penurunan di turbin tekanan rendah terjadi akibat kenaikan flow sehingga dayanya berkurang. Pada turbin tekanan menengah terjadi kenaikan efisiensi dari 72% menjadi 90,5% karena adanya kenaikan tekanan uap yang masuk ke reheater. Pada turbin tekanan tinggi efisiensinya konstan sekitar 80%.Untuk analisa daya aktual terhadap beban diperoleh selisih sekitar 0,4%-1,5%, hal itu menunjukan bahwa performa turbin dan generator masih baik. Kata Kunci : Efisiensi Isentropik, Turbin Uap, PLTU. Steam Turbine in PLTU 1 Jawa Barat Indramayu has been operated since early 2011, therefore its performance may has decreased. Calculation of efficiency is needed to find out the decrease of performance by comparing between the actual power and isentropic power of steam Turbine. The object of analyzis is Turbine unit #2. Calculated performance indicator includes isentropic efficiency, actual power of steam Turbine and isentropic power of steam Turbine. Data of parameter required in calculation are obtained from operation monitoring computer in central control roo and data from performance test. From the analysis of isentropic efficiency, low pressure turbin efficiency decreased from 95,6% to 54,5% within the increase of unit load. This decrease is due to the increase of steam extraction flow that reduce power prodoced. Efficiency increase was found in intermediate pressure Turbine from 72% to 90,5% due to increase of pressure in reheating process. Efficiency of high pressure Turbine was found out constant. In comparation between actual power and unit load, a difference of 0,4%-1,5% shows that steam turbin and generator still in good condition. Keyword : Steam Turbine Isentropik Efficiency , Power .
Da J L E - One of the best experts on this subject based on the ideXlab platform.
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a modelling approach to assessing the feasibility of the integration of power stations with steam electrolysers
Chemical Engineering Research & Design, 2014Co-Authors: Mithila N Manage, Eva Sorense, S J R Simons, Da J L EAbstract:Abstract Hydrogen, combined with fuel cell technology, is an option for reducing our reliance on hydrocarbon-based fuels. Solid oxide electrolyser cells (SOECs) have been studied as a possible technology to produce hydrogen from steam. As the current global energy mix is heavily reliant on hydrocarbon-based fuels, utilising existing technologies such as coal fired power plants, combined with SOECs in an integrated system, may enable a path towards reducing carbon dioxide emissions as well as creating a way of introducing ‘cleaner’ fuel. In this work, a steady state model of a SOEC was developed and used to assess the feasibility of using hot steam from a power plant as feed to a SOEC. The main objective was to study the ways of improving the SOEC efficiency. The most favourable feed for the SOEC was to extract steam prior to the intermediate pressure Turbine, which showed SOEC efficiency improvement of 25% compared with conventional SOEC operation of heating water at 25 °C. The thermoneutral point of 4644 A m−2 was shown to be a guide for assessing design and operation options with heat integration possibilities after this point. For scenarios of 7% steam extraction and a purely H2 production plant, 250 MW (7500 kg h−1) and 290 MW (8700 kg h−1) H2 can be produced with SOECs sized at 43,300 and 50,100 m2, respectively.