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We have examined applicability to an integrated coal gasification combined cycle with carbon capture and storage (IGCC-CCS) system for Ni/Mo/TiO2 catalyst (Ni/Mo/Ti), which is a sulfur-tolerant water-gas shift (WGS) catalyst (sour shift catalyst), developed for the purpose of generation efficiency improvement for the IGCC-CCS system. First, we carried out a 1000-h continuous experiment for the H2O/CO...
This paper constructs a Malmquist energy productivity index based on the Shephard energy distance function to measure total-factor energy productivity change. In order to account for individual heterogeneities as well as statistical noises, we use a newly developed fixed-effects SFA model for estimation. Then it is applied to compare energy productivity growth across the world's 123 economies. The...
The share of electricity generated from intermittent renewable sources, e.g., wind and solar grows rapidly. This affects grid stability and power quality. If the share of renewable power generation is to be increased further, additional flexibilities must be introduced.Aggregating small, distributed loads and energy storage facilities is a good medium-term option. In this paper, the suitability of...
To investigate the effects of fuel NO formation models on the prediction of NO concentrations in a coal combustion field, numerical simulations for a coal combustion field in a 760 kW test furnace were performed. Three models, those proposed by De Soete, Chen et al. and Mitchell et al. were employed to calculate fuel NO formation originating from volatile matter. The results show that the model proposed...
In order to identify and compare annual degradation rates of wind turbines, power performance testing was experimentally carried out on the Hankyeong (seaside) and Seongsan (inland) wind farms of Jeju Island, Korea. Five to six years' worth of raw nacelle wind data from SCADA system were analyzed for this work. Power curves were drawn for each year according to IEC 61400-12-1. The AEP and the CF were...
Natural gas combined cycles (NGCCs) represent the main power generation technology in Italy, with a share of more than 40% of global thermoelectric power production. Due to their high operational flexibility, it is likely that NGCCs will continue to play a very important role in maintaining the reliability of supply in a power generation infrastructure characterized by the increasing spread of renewable...
A new three-stage gasifier consisting of an auger gasifier, a fluidized bed gasifier, and a tar-cracking zone was applied for the gasification of dried sewage sludge to obtain a high-quality producer gas with low levels of impurities (tar, NH3, and H2S). In the experiments, the effects of activated carbon (AC), equivalence ratio, the weight ratio of AC to fuel, and feed rate were investigated. In...
Increasing market penetration of renewable energy sources requires measures to stabilize the electric grid. This includes reducing generator output fluctuations as well as providing control reserve. The present study investigates the use of molten-salt storage systems in fossil-fired power plants by conducting a series of numerical process simulations. Two case studies are performed: First, an incinerator...
This paper presents the production, characterization and possible utilization of a bio-oil obtained from Mahua oilseed, which is potentially available in India. Pyrolysis was carried out between 450 °C and 600 °C under semi-batch type reactor for the production of Mahua pyrolysis oil (MPO). The yield of the MPO was found to be about 50% at an optimum temperature of 525 °C. The MPO was also characterized...
The traditional approach to design and deploy microgrids has been mainly focused on ac systems. DC microgrids, however, are gaining attention due to numerous advantages they provide over ac microgrids, such as removing the need for synchronization and frequency adjustment as well as appropriateness in supporting dc loads and distributed energy resources (DERs). Moreover, considering that both ac and...
This study addresses the problem of erosive wear of Francis turbine runner of a typical power station located in northern Himalayan belt of India. Wear damage is determined using the erosion models of IEC-2009, IEC-2013, empirical assessment of Thapa and a methodology proposed in this research work. The proposed model introduces effect of relative velocity of turbine instead of characteristic velocity...
Crude benchmark oil prices play a crucial role in energy policy and investment management. Previous research confined itself to studying the static, uncertain, short- or long-term relationship between global benchmark oil prices, ignoring the time-varying, quantitative, dynamic nature of the relationship during various stages of oil price volatility. This paper proposes a novel approach combining...
Identification of Maintenance Significant Items (MSI) is one of the key phases of the Reliability Centered Maintenance (RCM), which is a screening phase where the number of items for analysis is reduced. But at present, there is little systematic and convenient operation method to identify the MSI. In this paper, we presented a framework for identification of the MSI through combination of quantitative...
An energy pile equipped with a W-type heat exchange pipe was constructed in reclaimed soft ground, which is fabricated in a large-diameter cast-in-place pile. The diameter of the energy pile is 1.5 m and the drilled depth reaches to a 60 m whilst the heat exchange pipe is inserted to 30 m depth from the ground surface. To evaluate thermal performance of the constructed energy pile, a series of in-situ...
Direct use of geothermal energy can present challenges of financial feasibility in a low-enthalpy setting. The average temperature gradients in sedimentary basins make it necessary to reach larger depths for meaningful heat production, thus increasing the drilling cost. Therefore, full realization of geothermal projects in low-enthalpy environments has been difficult and not widely deployed. The concept...
The excess of short circuit currents (SCC) has threatened the security of electrical energy transmission and become one of the most critical problems in power grid operations. At present, high voltage direct current (HVDC) transmission technology is a practical and applicable option to limit short circuit currents by separating a synchronous power grid into several asynchronous power grids. During...
Liquefaction of macroalgae was performed in a stirred autoclave reactor using supercritical ethanol (scEtOH) as a solvent. There was a sharp transition in ethanol consumption during macroalgae liquefaction in scEtOH when the temperature was increased from 350 to 400 °C. At 350 °C, a small amount of ethanol (6 wt%) reacted with intermediates, while at 400 °C, 18 wt% of the ethanol was consumed. Taking...
The objective of this work was to assess the influence of the row cleaner attack angle, the gap between discs, the working depth of a narrow tine and the strip tillage machine's working speed on tractor fuel consumption and on greenhouse effect-related CO2 gas emissions into the environment. This research was carried out by changing the row cleaner disc attack angle from 10.0° to 22.5°, the gap between...
This paper investigates how an extensive implementation of net Zero Energy Buildings (ZEBs) affects cost-optimal investments in the Scandinavian energy system towards 2050. Analyses are done by a stochastic TIMES model with an explicit representation of the short-term uncertainty related to electricity supply and heat demand in buildings. We define a nearly ZEB to be a highly efficient building with...
The performance of solar photovoltaic modules mounted on the rooftop of a rail coach of The Indian Railways is reported here. The focus of this experiment was to quantify the reduction in diesel consumption of the end-on generation system that powers the electrical load in the new generation coaches. A coach retrofitted with two flexible solar photovoltaic modules was run at speeds up to 120 km/h...
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