Academic literature on the topic 'Shut down and start up trends'

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Journal articles on the topic "Shut down and start up trends"

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Li, Min, Chao Wang, Kefa Cen, Mingjiang Ni, and Xiaodong Li. "Emission characteristics and vapour/particulate phase distributions of PCDD/F in a hazardous waste incinerator under transient conditions." Royal Society Open Science 5, no. 1 (2018): 171079. http://dx.doi.org/10.1098/rsos.171079.

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Polychlorinated dibenzo-p-dioxin and polychlorinated dibenzofuran (PCDD/F) emission characteristics and vapour/particulate phase partitions under three continued operation conditions, i.e. shut-down, start-up and after start-up, were investigated by sampling stack gas. The results indicated that the PCDD/F emission levels were 0.40–18.03 ng I-TEQ Nm −3 , much higher than the annual monitoring level (0.016 ng I-TEQ Nm −3 ). Additionally, the PCDD/F emission levels in start-up were higher than the other two conditions. Furthermore, the PCDD/F congener profiles differed markedly between shut-down
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Shi, Xiujiang, Jiqiang Wu, Bin Zhao, Xuan Ma, and Xiqun Lu. "Mixed thermal elastohydrodynamic lubrication analysis with dynamic performance of aero ball bearing during start-up and shut-down." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 234, no. 6 (2020): 873–86. http://dx.doi.org/10.1177/1350650119900401.

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In this study, a coupling model is developed to include the aero ball bearing dynamic performance in the mixed thermal elastohydrodynamic lubrication analysis, and the low-speed and heavy-load conditions during start-up and shut-down are involved. Based on the bearing quasi-dynamics, the inside motion state of the main loading surface is obtained, and the mixed thermal elastohydrodynamic lubrication is conducted to get bearing lubrication state and properties. The numerical lubrication model under low-speed and heavy-load conditions is validated against published tested data, which reveal well
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Klodian, Gumeni. "Analyzing and Solving Stability Problems during the Commissioning of the Steam Turbine." International Journal of Recent Technology and Engineering (IJRTE) 9, no. 3 (2020): 316–20. https://doi.org/10.35940/ijrte.C4435.099320.

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The commissioning of the steam turbine in the CCPP of Vlore (Albania) was carried out after a shutdown of about one year. During previous operation of the unit, in particular in a couple of shutdowns, were observed high vibration at bearing MAD 21. Before the restart, the oil deflector of the MAD21 bearing (the bearing located in the front standard, on the inlet side of the steam turbine and adjacent to the clutch) was modified increasing the radial clearance on the part of the oil deflector acting as a thermal shield with the aim of eliminating / preventing the risk of rubbings. Rubs at the l
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Peplow, Andrew, Javad Isavand, Afshar Kasaei, Babak Afzali, and Delphine Bard-Hagberg. "A Speed-Variant Balancing Method for Flexible Rotary Machines Based on Acoustic Responses." Sustainability 13, no. 13 (2021): 7237. http://dx.doi.org/10.3390/su13137237.

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As rotary machines have become more complicated, balancing processes have been classified as a vital step in condition monitoring to ensure that machines operate reliably, smoothly and safely. All rotating objects will deflect during rotation and all objects possess certain natural frequencies in the absence of rotation. However, an unbalanced object can cause significant unwanted deflection created by resonant vibration at a frequency (cycles/second) close to certain rotational speeds (rotations/second), known as critical speeds. This is especially important for flexible machines which normal
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Escalera López, Daniel, Steffen Czioska, Janis Geppert, et al. "Uncovering Activity-Stability Relationships in Mixed Ir-Based Catalysts Toward Improved Water Electrolysis." ECS Meeting Abstracts MA2022-01, no. 34 (2022): 1373. http://dx.doi.org/10.1149/ma2022-01341373mtgabs.

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The role of proton exchange membrane water electrolysers (PEMWE) in providing clean and reliable green hydrogen is undeniable in a fully decarbonized energy system. Indeed, the ambitious “Hydrogen Shot” initiative by the U.S. DoE seeks to decrease in a decade green hydrogen pricing down to 1$/Kg H2.(1) Such endeavour will require a mass-scale implementation of PEMWEs, which is currently bottlenecked by the use of scarce precious metal catalysts, particularly at the anode where loadings of the state-of-the-art iridium (Ir) catalyst typically range between 1-3mgIr cm-2.(2) Thus, recent strategie
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Michael McCoy. "Microbiome start-up Kaleido to shut down." C&EN Global Enterprise 100, no. 13 (2022): 18. http://dx.doi.org/10.1021/cen-10013-buscon17.

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Deng, Jun, and Hua Wei. "An MILP Formulation for the Thermal Unit Commitment Problem Considering Start-Up and Shut-Down Power Trajectories." Applied Mechanics and Materials 672-674 (October 2014): 493–98. http://dx.doi.org/10.4028/www.scientific.net/amm.672-674.493.

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This paper presents a mixed-integer linear formulation for the thermal unit commitment problem considering the start-up and shut-down power trajectories. A realistic and accurate modeling of the unit’s operating phase is given, which includes the phases of start-up, dispatchable and shut-down. The start-up type is decided by the unit’s prior off-line time. The start-up costs and power trajectories depend on the type of start-up. A new set of binary variables is introduced to represent the dispatchable status, which can decrease the binary variables and constraints significantly. Finally, a tes
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Duda, Piotr, and Mirosław W. Mrzygłód. "Shape and operation optimization of a thick-walled power boiler component." MATEC Web of Conferences 240 (2018): 05006. http://dx.doi.org/10.1051/matecconf/201824005006.

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The aim of this article is the proposition of a two-stage optimization of power boiler components subjected to transient thermo-mechanical loads. As the basis of transient load regime, the TRD 301 regulations are used. In the first stage of an investigation, the genetic algorithms are used to determine the optimal shape of the structure. As optimization constraints, the maximum total stresses in the whole cycle are assumed. In the next stage, the method for the start-up and shut-down operation optimization is shown. The problem is defined to minimize the time of start-up and shut-down processe
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Dwornicka, Renata. "The Impact of the Power Plant Unit Start-Up Scheme on the Pollution Load." Advanced Materials Research 874 (January 2014): 63–69. http://dx.doi.org/10.4028/www.scientific.net/amr.874.63.

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The typical problem in design of experiments methodology is to avoid risk of obtaining The article presents problems related to optimization of start-up and shut-down of the power unit located in a coal-based electric plant. The optimization includes minimization of the start-up and shut-down duration while maximum allowed stresses in the main steam valve are simultaneously taken into consideration. Such approach leads to increasing of overall efficiency of the power unit and as a result to reducing of environmental burden with the same amount of energy obtained.
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Choudhari, S. H. "Start-Up and Shut-Down of Large Size Turbo Sets." IFAC Proceedings Volumes 19, no. 16 (1986): 231–34. http://dx.doi.org/10.1016/s1474-6670(17)59384-2.

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Dissertations / Theses on the topic "Shut down and start up trends"

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Karlsson, Rikard. "Hybrid start up/shut down vibrations." Thesis, KTH, Farkost och flyg, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-39688.

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A vehicle start/stop engine system is investigated with focus on human perception of discomfort. The FRF between engine rotational acceleration around the neutral torque axis (NTA) and seat rail acceleration with the specific interest in start up and shut down events is estimated from measurements, using a shaker torque excitation. The inverted torque sensitivity formulates a frequency dependent target of powertrain torque related to seat rail acceleration. The main rotation direction for the transversally mounted engine is the pitch-direction, yielding high acceleration levels in both longitu
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Lamibrac, Adrien. "Étude des dégradations dans les piles à combustible PEMFC pendant les phases de démarrage/arrêt." Thesis, Université de Lorraine, 2013. http://www.theses.fr/2013LORR0117/document.

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Cette thèse contribue à l'identification des mécanismes de dégradation qui ont lieu durant les phases de démarrage et d'arrêt des Piles à Combustible à Membrane Échangeuse de Proton. Dans un premier temps, des démarrages et arrêts individuels sont étudiés au moyen d'une cellule équipée de collecteurs de courants segmentés. Les courants internes qui sont produits durant ces opérations peuvent ainsi être mesurés. La mesure du dioxide de carbone dans les gaz d'échappement de la cathode révèle qu'une partie des courants internes correspond à de l'oxydation du carbone. Une autre part provient des r
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Oyarce, Alejandro. "Electrode degradation in proton exchange membrane fuel cells." Doctoral thesis, KTH, Tillämpad elektrokemi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-133437.

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The topic of this thesis is the degradation of fuel cell electrodes in proton exchange membrane fuel cells (PEMFCs). In particular, the degradation associated with localized fuel starvation, which is often encountered during start-ups and shut-downs (SUs/SDs) of PEMFCs. At SU/SD, O2 and H2 usually coexist in the anode compartment. This situation forces the opposite electrode, i.e. the cathode, to very high potentials, resulting in the corrosion of the carbon supporting the catalyst, referred to as carbon corrosion. The aim of this thesis has been to develop methods, materials and strategies to
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Ayyagari, Balakrishna. "Simulation and Validation of Vapor Compression System Faults and Start-up/Shut-down Transients." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-9780.

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The statistics from the US Department of Energy show that about one-third of the total consumption of electricity in the households and industries is due to the Air Conditioning and Refrigeration (AC & R) systems. This wide usage has prompted many researchers to develop models for each of the components of the vapor compression systems. However, there has been very little information on developing simulation models that have been validated for the conditions of start-up/shutdown operations as well as vapor compression system faults. This thesis addresses these concerns and enhances the existin
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Books on the topic "Shut down and start up trends"

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Frank W. Cawood and Associates., ed. Easy computing for seniors: A step-by-step handbook from start-up to shut-down. FC&A Pub., 2002.

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Singh, Tej. Cirus start-up after 205 days of long shut down: A report on operational physics and instrumentation. Bhabha Atomic Research Centre, 2005.

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Easy Computing for Seniors: A Step-By-Step Handbook From Start-up to Shut-Down. The Editors of FC&A, 2004.

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Book chapters on the topic "Shut down and start up trends"

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de Groot, W. Herman. "Plant Start-Up/Shut-Down and Operational Conditions Sulphonation/Neutralisation." In Sulphonation Technology in the Detergent Industry. Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-015-7918-6_8.

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Bacci, Tiziano, Antonio Frangioni, and Claudio Gentile. "Start-up/Shut-Down MINLP Formulations for the Unit Commitment with Ramp Constraints." In AIRO Springer Series. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-63072-0_26.

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Hauptmanns, Ulrich, and Jaime Rodríguez. "Probabilistic Safety Analysis of a Plant for the Production of Nitroglycol including Start-up and Shut-down." In Probabilistic Safety Assessment and Management ’96. Springer London, 1996. http://dx.doi.org/10.1007/978-1-4471-3409-1_87.

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Sarkar, Dipak K. "Start-Up and Shut-Down." In Thermal Power Plant. Elsevier, 2015. http://dx.doi.org/10.1016/b978-0-12-801575-9.00012-3.

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"start-up and shut-down." In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik. Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_196750.

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"Start-up and shut-down procedures." In Design of Slurry Transport Systems. CRC Press, 1991. http://dx.doi.org/10.1201/9781482296600-41.

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Choudhari, S. H. "START-UP AND SHUT-DOWN OF LARGE SIZE TURBO SETS." In Automation and Instrumentation for Power Plants. Elsevier, 1989. http://dx.doi.org/10.1016/b978-0-08-034197-2.50037-9.

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BIEN, ZEUNGNAM, DONG-HWAN HWANG, HANOH LEE, and HYUNG-KEUN RYU. "AN AUTOMATIC START-UP AND SHUT-DOWN CONTROL OF A DRUM-TYPE BOILER USING FUZZY LOGIC." In Advances in Fuzzy Systems — Applications and Theory. WORLD SCIENTIFIC, 1994. http://dx.doi.org/10.1142/9789814503679_0002.

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"Effective and Key Financial Management Solutions for Entrepreneurs and Business Owners." In Advances in Finance, Accounting, and Economics. IGI Global, 2025. https://doi.org/10.4018/979-8-3693-9415-1.ch010.

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These days, business owners are at an unprecedented level of economic anxiety, and this issue threatens the financial stability of companies. Many businesses around the world have been shut down due to social distancing measures, many of which will likely close permanently. Entrepreneurs and start-up business owners who seek to avoid this fate must pay more attention to their financial management, because not paying enough attention to this issue now is like buying a one-way ticket to bankruptcy. Instead of sitting around and waiting for financial salvation to magically appear, try to be cauti
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Jaffer Vali, Dr Shaik. "AN IOT UTILITY MODULE PLACEMENT METHOD FOR CLOUD-FOG COMMUNITY ENVIRONMENT." In Futuristic Trends in IOT Volume 3 Book 4. Iterative International Publishers, Selfypage Developers Pvt Ltd, 2024. http://dx.doi.org/10.58532/v3bdio4p2ch2.

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As of late, the thought of dispensed computing has been stretched out toward the organization edge. Gadgets shut to the employer edge, known as haze hubs, provide figuring capacities with low inertness to neighborhood give up gadgets. In the subsequent haze figuring worldview (moreover called side processing), Utility components can be conveyed to a disseminated foundation, involving each cloud server farms and haze hubs. The preference which foundation hubs ought to have which utility components has an widespread effect on widespread framework boundaries like execution and electricity utiliza
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Conference papers on the topic "Shut down and start up trends"

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Allahverdian, Hayrik, Anil Singh, Gabriel Saldivar, and Jim McVay. "Chloride Stress Corrosion Cracking of an Austenitic Stainless Steel Pipe Fitting in a Hydroprocessing Unit." In CORROSION 2017. NACE International, 2017. https://doi.org/10.5006/c2017-09518.

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Abstract Cracking occurred in a stainless steel branch nozzle fitting at a low point in the reactor effluent piping in a Gasoil Hydrotreater unit following start up. Normal preventive measures were implemented to protect the reactor effluent piping system (made of HF modified material) against Polythionic acid stress corrosion cracking (PTASCC) during shut down (neutralization & nitrogen purging), however cracking occurred in the 321 (UNS S32100) type austenitic stainless steel (SS) weld-olet right after the start up. Materials selection of the low point drain, which used Alloy 825 (UNS N0
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Scholz, A., and C. Berger. "Improved Methods of Creep-Fatigue Life Assessment of Components." In AM-EPRI 2007, edited by R. Viswanathan, D. Gandy, and K. Coleman. ASM International, 2007. https://doi.org/10.31399/asm.cp.am-epri-2007p0748.

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Abstract Here’s a refined version of your abstract for improved clarity, grammar, and readability: Enhanced life assessment methods contribute to the long-term operation of high-temperature components by reducing technical risks and increasing economic benefits. This study investigates creep-fatigue behavior under multi-stage loading, including cold start, warm start, and hot start cycles, as seen in medium-loaded power plants. During hold times, creep and stress relaxation accelerate crack initiation. Creep-fatigue life can be estimated using a modified damage accumulation rule that incorpora
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Thodla, Ramgopal, Feng Gui, and Ashwini Chandra. "Subcritical Crack Growth Rate of X65 Steel in Offshore Applications - Sour Service." In CORROSION 2018. NACE International, 2018. https://doi.org/10.5006/c2018-10963.

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Abstract Subsea flowlines and risers experience fatigue cycles due to thermal and/or pressure transients or vortex induced vibration (VIV). Flowlines and risers also experience extended period of constant hold (i.e., static load) during operation. Low alloy bolts on subsea equipment also experiences constant load in addition to the fatigue loading during start up and shut down. Although there has been work on the fatigue damage of flowlines and risers, little work has been done to understand the crack growth rate (CGR) resulting from the static loading during operations in production environme
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Singh, Anil, Emil Bereczky, and Ted Anderson. "Toughness Considerations for Centrifugally Cast HF - Modified Alloy Piping Used in Hydroprocessing Services." In CORROSION 2004. NACE International, 2004. https://doi.org/10.5006/c2004-04641.

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Abstract Centrifugally cast HF-modified austenitic-ferritic stainless steel piping has been used in hydroprocessing reactor circuit for about 40 years. Over the years, there have been a few reported cases of cracking incidences. One resulted in a leak upon start up, after a planned shut down. The others were non-penetrating. Room temperature Charpy V-notch impact values of this alloy are significantly reduced once the material is subjected to service conditions. Crack tip opening displacement (CTOD) tests were performed on service exposed, as well as unused HF-modified piping to study resistan
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Zhengmao, Yang, Kristian Norland, Neil Brown, and Daniel Karunakaran. "Upheaval Creep of Rock Dumped Flexible Flowline." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-23673.

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For the protection from dropped object/fishing trawl impact, flexible flowlines are normally trenched or rock-dumped. And hence, upheaval buckling and lateral buckling may be promoted by the elevated temperatures and high pressures. Due to the unique properties of un-bonded flexible flowline, the flexible flowline may creep in the trench or rock berm when it is subjected to cyclic pressure and temperature changes due to start-up and shut-down of flowline in service. In this paper, a finite element analysis model for the global buckling and upheaval creep of flexible flowline is proposed. In th
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Yin, Chunyu, Xiaoyong Yang, and Jie Wang. "Dimensionless Analysis of Heat Transfer and Flow Resistance on Laminar Flow Recuperator." In 16th International Conference on Nuclear Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/icone16-48218.

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Recuperator is one of the key components in the helium-turbine cycle coupled with High Temperature Gas cooled Reactor (HTGR). Synthetically considering the heat transfer coefficients, the pressure drop and installation space of recuperator, it is obviously a trend to use compact heat exchanger as recuperator in nuclear power plant. Recuperator recovers heat from the turbine exhaust gas. It promotes the cycle efficiency over entire power range and in all typical modes including start up and shut down modes. The recuperator’s heat transfer coefficients, height, pressure drop have effect on the r
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Soares, Cesar, Mohamed Adil, Aditya Pareek, Amit Vashistha, Yashaswi Shivank, and Urmi Dutta. "An Integrated Digital Solution for Well Shut-In Detection and Validation and Reservoir Pressure Estimation." In SPE Annual Technical Conference and Exhibition. SPE, 2023. http://dx.doi.org/10.2118/215026-ms.

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Abstract Shut-ins of production and injection wells are an integral part of annual asset planning to obtain information that is unavailable during production well tests or routine injection operations. Near-wellbore reservoir pressures, productivity and injectivity indices, and skin factors are critical for production, injection and maintenance schedule planning and can be estimated using pressure data observed during well shut-ins. Engineers across different assets often utilize spreadsheet-based tools with custom written macros to acquire and analyze relevant data and to estimate well parame
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Biliotti, Davide, Alberto Scotti Del Greco, Francesco Cangioli, and Giuseppe Iurisci. "A New Approach to Performance Mapping of Radial Inflow Turbines." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91856.

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Abstract The performance of radial inflow turbines, and specifically of turboexpanders for oil & gas applications, has been traditionally described in terms of efficiency versus velocity speed ratio (U/C) and discharge flow coefficient (Q/N). Especially in the testing phase, this latter parameter has been often preferred to the angle setting of moveable inlet guide vanes (IGV), which are standard equipment for most turboexpanders. In practice, the expander U/C has been often considered to give the performance backbone, while the Q/N ratio has been used for secondary corrections. Moreover,
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Guerrero-Mestre, Victoria, and Javier Contreras. "Stochastic unit commitment considering start-up and shut-down trajectories." In 2016 IEEE Power and Energy Society General Meeting (PESGM). IEEE, 2016. http://dx.doi.org/10.1109/pesgm.2016.7741655.

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Evans, P., J. Sandvig, J. Churchill, J. Lowe, D. Newman, and M. Weel. "Continuous Measurement of Methane Emissions from Turbines and Compressors Using Predictive Emissions Monitoring (PEMS) Technology – New Insights from a Global Deployment Programme." In SPE International Health, Safety, Environment and Sustainability Conference and Exhibition. SPE, 2024. http://dx.doi.org/10.2118/220445-ms.

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Abstract A new predictive emissions monitoring system (PEMS) is presented for the continuous measurement of methane emissions from incomplete combustion in natural gas-fuelled turbines and engines used in oil and gas production facilities. The method integrates condition monitoring and environmental data with first-principles models of energy and mass conservation to derive continuous tracking of methane emissions with minute-level resolution, full traceability, and an estimation of uncertainty. It is designed to fulfil the expectations of site-specific methane emissions reporting, including L
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