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A research is proposedon two-phase flow instability in parabolic trough DSG solar power by means of theoretical analysis combined with numerical simulation, which is based on the working mechanism, heat transfer characteristic of the parabolic trough DSG solar power, and the basic principle, mainfactors and damages of two-phase flow instabilities. The detailed study of uneven distribution of solar...
The problems of uneven flow distribution of vapour-liquid in the parallel pipes widely exist in power boilers, steam generators, heat exchangers and boiling water reactors. The root cause of instability is that the pressure drop versus mass flow rate curve of the system shows an "N-shape" behaviour. To solve this two-phase instability, the simplest and the most effective method is to install...
In order to design and scale up an efficient slurry bubble reactor for liquid fuel synthesis, the effects of distance between adjacent holes, superficial gas velocity, initial liquid height and opening area on local profile of phase holdup are explored experimentally and numerically in the bubble columns with perforated plate distributor. Simulated overall gas holdup by the standard k-ε turbulence...
Due to the growing demand on renewable energy, photovoltaic (PV) generation systems have increased considerably in recent years. However, the power output of PV systems is affected by different weather conditions. Accurate forecasting of PV power output is important for the system reliability and promoting large scale PV deployment. This paper proposes algorithms to forecast power output of PV systems...
Capacity and output power forecasting have great significance in seamless integration of renewable energy to the grid. However, the uncertainty of wind power and intermittence of wind energy are the main factors which affect forecasting precision. The wind power output data can be treated as a signal stream which has characteristics for possible wind capacity forecasting. Hilbert-Huang Transforms...
The prediction algorithm is an important key factor in wind power prediction. However, there are pros and cons on different forecasting algorithms. Based on the principles of wavelet transform (WT), support vector machine (SVM) as well as characteristics of wind turbine generation systems, two prediction methods are presented and compared in this paper. In method 1, the time series of model input...
There are two configuration modes of the FGD booster fan in thermal power plants. One is to install booster fan behind induced draft fan, called the separation mode; the other is to integrate the two kinds of fans, that is to cut off booster fan, but install a bigger induced draft fan which can support the pressure head for the whole system, called the integration mode. Through detailed analysis,...
In this study, detailed models such as boiler furnace and convective heat exchanger, with the consideration of the requirements of boiler thermodynamic calculation, were developed based on Aspen Plus user model. A boiler system for the thermodynamic calculation of a 600 MW sub-critical boiler was established and results were compared to the reference data. The comparison indicates that the models...
This paper presents the results of ASPEN simulations of a carbon-dioxide (CO2) removal and recovery plant that captures CO2 from a 300 MW conventional coal-fired power plant. It also analyzes the techno-economic performance of 300 MW coal-fired power plant with and without ammonia-based CO2 capture process, based on the operating data of an existing power plant. Simulation and calculations indicate...
Hydrogen production based on chemical looping combustion can obtain clean hydrogen with near zero emission of carbon dioxide. This technique can be auto-thermal, making it very promising for hydrogen production. In this paper, the interconnected fluidized beds were established for cold model study, and tests were carried out, aiming at providing some design information for the hot bench. Experiments...
Air supply is one of the most important factors that influence the combustion of the volatile and carbon in a biomass fired boiler. For many biomass power generation plants, there is insufficient measure to assure the proper air supply. In this study, computational fluid dynamics (CFD) modeling of a double-grate biomass fired boiler was carried out. The three-dimensional Reynolds averaged Nervier-stokes...
Short term wind power prediction is one of the effective ways to cope with the operational problems caused by the variability of the wind energy resource when a large penetration of wind power is integrated into electric power systems. In this paper, a model combining a Genetic Algorithm with a Piecewise Support Vector Machine (GA-PSVM) is developed that improves the precision of short term wind power...
The arithmetic of wind power prediction plays an important part in the development of wind power prediction. In this paper, based on the principles of support vector machine (SVM) and wavelet, the wavelet SVM model for short term wind power prediction is built up along with analyzing the characteristics of power curves of wind turbine generator systems. The operation data from a wind farm in North...
Based on a traditional SOFC hybrid power system, a zero CO2 emission SOFC hybrid power system with steam injection is proposed in this paper and its performance is analyzed. Oxy-fuel combustion can burn the fuel gas from anode thoroughly, and increases the concentration of CO2 gas, which will greatly reduce the energy consumption of CO2 separation. At the same time with the steam injected into the...
Significant progress has been made in energy conservation and consumption reduction since the 11th Five-year Plan. 600MW-class thermal power units have become the main force in China's power mix. It is crucial to study the energy-saving potential, improve the economic operation and overall competitiveness of 600MW power units. Taking a 600MW power unit of certain power corporation for instance, the...
This paper analyzes the techno-economic performance of 600 MW coal-fired power plant with and without ammonia-based CO2 capture process, based on the operating data of an existing power plant. The simulation and analysis, with fully consideration of features of existing coal-fired power plants and the integration of CO2 capture process with steam cycle, are made to reveal the thermal and environmental...
This paper proposes a new environmental friendly evaluation criterion to assess the comprehensive performance of coal-fired power plant. The new evaluation criterion, which is called the comprehensive Index of Energy, Resources and Environment (IERE), can synthetically evaluate the thermal, economical and environmental performance of power plants. Based on the new criterion, the paper analyzes the...
High-efficiency, energy-saving and environmentally friendly supercritical thermal power units are gradually becoming main stream in China. In this paper, an advanced energy system analysis method, specific consumption analysis, is used to examine the performance of 600MW supercritical coal-fired power plants and to identify and evaluate the specific consumption accruals. Moreover, the specific consumption...
Numerical simulation of gas-solid flow in fluidized bed has been carried out based on two-fluid model (TFM) in the paper. The influence of different height of bed material, superficial velocity, restitution coefficient of granular elasticity, drag model and time step calculated on phase mixing and bubbles appeared was analyzed and investigated. The results showed that by using the same drag model,...
The functionalization and electric properties of graphene by the addition of transition metal atom of Ni to its surface had been investigated computationally using density functional theory with the generalized gradient approximation. The stable geometry adsorption position, binding energy, band gap, density of states, charge transfer of Ni adsorbed on graphene at two different coverages were calculated...
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