scholarly journals Features of swirled flows in power plant chimneys

2021 ◽  
Vol 2088 (1) ◽  
pp. 012039
Author(s):  
P V Roslyakov ◽  
D A Khokhlov ◽  
M N Zaichenko ◽  
I L Ionkin
Keyword(s):  
Power Plant ◽  
Swirling Flows ◽  
Computational Studies ◽  
Operating Modes ◽  
Gas Supply ◽  
Swirled Flows

Abstract The results of computational studies of the cylindrical and conical chimneys operating modes are presented. It is shown that with opposite gas supplies, swirling flows appear. Their shape and intensity depend on the type of chimney stack and the gas supply conditions. Swirling flows significantly affect the fields of axial and tangential velocities and determine the conditions for the gas outflow from the chimney.

Study on 3-D Flow Field of Concrete Volute Conduit of Circulating Water Pump in Nuclear Power Plant

2011 ◽  
Vol 99-100 ◽  
pp. 350-353
Author(s):  
Xiao Bing Sun ◽  
Xu Bin Qiao
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Stokes Equations ◽  
Three Dimensional ◽  
Gradual Change ◽  
Water Pump ◽  
Pump System ◽  
Circulating Water ◽  
Operating Modes

As the largest unit capacity of nuclear power plant at present, the flow conduit of circulating water pump in EPR1750 nuclear power plant is a volute conduit, which is a cast-in-situ conceret structure with complexly gradual change cavity. Therefore, the hydraulic efficiency of circulating water pump is not only related with the design of pump leaves, but also closely related to the design of volute and the complicated spatial type of intake and outtake conduits. With the pump leaves and the intake and outtake conduits of conceret volute as the research model, based on computational fluid dynamics (CFD)and the three dimensional Reynolds averaged Navier-Stokes equations, an analytic model suitable for computation is established to simulate the three-dimensional steady flow in the whole pumping system under different operating modes. By use of the commercial fluid-computation softer ANSYS, the distribution of basic physic quantities in the fluid field inside the pump and the conduits is obtained. The analysis and prediction of the performance of pump system are made, and the spatial type design of intake and outtake conduits is evaluated. The calculation results can be referenced to improve the design of pump systems in the similar projects.

Enhancing Prediction Accuracy in the Evaluation of Power Plant Uprates Utilizing a Novel ‘Big Data’ Approach

2018 ◽  
Author(s):  
Peter Pechtl ◽  
Christian Scheinecker ◽  
Josef Petek
Keyword(s):  
Big Data ◽  
Power Plant ◽  
Economic Assessment ◽  
Fast Evaluation ◽  
Detailed Model ◽  
Current Configuration ◽  
Fuel Savings ◽  
Operating Modes ◽  
Definition Of ◽  
Operational Data

The evaluation of power plant uprates has traditionally been based on the definition of several ‘typical’ operating modes based on historical data and a — more or less detailed — model of the plant that is compared in current configuration against the same base model including the modifications under consideration. For the economic assessment of the uprate, annual operating hours are allocated to the operating points, and fuel savings and/or additional output predicted by the model due to the modifications are evaluated against the expected investment cost. In this study, the authors demonstrate that this classic approach contains risks in several aspects, in particular: • the representativeness of the ‘typical’ operating modes, • the accuracy of the model, and • the correctness of the assumptions in the allocation of operating hours. Utilizing the example of an actual uprate of a heat recovery steam generator (HRSG) in a large utility plant of an Austrian steel company, a new approach for an evaluation based on ‘big data’ is presented that uses a full year of operational data in hourly granularity for both, the verification of the accuracy of the plant model, and the evaluation of the effect of the uprate. The authors also provide details of the underlying technologies that allow for both, excellent match of operational data with a fully-fledged heat balance software and fast evaluation of tens of thousands of calculation cases.

Economic Analysis of a 660MW Supercritical Turbine for Steam Initial Parameters

2014 ◽  
Vol 960-961 ◽  
pp. 1550-1553 ◽  
Author(s):  
Yu Lin Tang ◽  
Shan Tu ◽  
Yang Du ◽  
Chao Wang ◽  
Hong Juan Wang
Keyword(s):  
Power Plant ◽  
Thermal Power ◽  
Steam Pressure ◽  
Heat Consumption ◽  
Operating Parameters ◽  
Steam Temperature ◽  
Operating Modes ◽  
Endothermic Process ◽  
Steam Parameters ◽  
Main Steam

Economic diagnosis of thermal power units is to determine the economy of its operating parameters and operating modes by quantitative and qualitative analysis, which is significant to economic operation and energy saving of power plant. On the basis of equivalent enthalpy drop method and the theory of variable conditions, the economic diagnosis model of operating parameters was established. As main steam temperature and main steam pressure for example, economic diagnosis of a 660MW supercritical steam turbine unit was performed. The result demonstrates that improving the main steam temperature or main steam pressure can reduce heat consumption of the unit. The essence of improving the initial steam parameters is to improve the average temperature of the steam cycle endothermic process, thus improving the circulation efficiency and reducing heat consumption. The economic impact of main steam temperature is up to 0.61g/(kW·h), while which of main steam pressure is little. Therefore, by increasing the initial steam parameters, especially the main steam temperature, to improve the economy of the entire power plant is the main way to enhance the efficiency of power plant in the current.

scholarly journals Optimal Gas Supply for Joint Electric Power Plant

1989 ◽  
Vol 109 (4) ◽  
pp. 254-261
Author(s):  
Nobuo Sannomiya ◽  
Yoshikazu Nishikawa ◽  
Keiichi Akimoto ◽  
Takashi Tsuda ◽  
Masatoshi Ookubo
Keyword(s):  
Power Plant ◽  
Electric Power ◽  
Electric Power Plant ◽  
Gas Supply

scholarly journals Simplified imitation model of fuel processor in composition of air-independent power plants

2020 ◽  
pp. 245-250
Author(s):  
А.В. Балакин ◽  
А.Н. Дядик ◽  
А.С. Кармазин ◽  
М.В. Ларионов ◽  
С.Н. Сурин
Keyword(s):  
Power Plant ◽  
Power Plants ◽  
Control Valve ◽  
Simulation Models ◽  
Operating Conditions ◽  
Fuel Processor ◽  
Operating Modes ◽  
Hydrogen Supply ◽  
Mass Flow Rates ◽  
The Individual

В статье представлена упрощенная имитационная модель, описывающая работу топливного процессора в составе воздухонезависимой энергетической установки. Рассмотрено блочное моделирование отдельных составляющих ВНЭУ, в частности, высокотемпературного реактора, блока очистки газа от серы и сажи, первого и второго блоков конверсии, сепаратора и регулирующего клапана. Имитационные модели отдельных элементов ВНЭУ позволяют рассчитывать динамические характеристики энергоустановки и создавать алгоритмы управления клапанами подачи водорода в переходных режимах. Теоретические зависимости для определения массовых расходов реагентов, температур и давлений приведены для идеальных газов с целью представления в среде LabVIEW с учетом полученных экспериментальных данных для проведения расчета маневров по регулированию давления на заданных режимах работы ВНЭУ при различных условиях ее работы. The article presents a simplified simulation model that describes the operation of the fuel processor as part of an air-independent power plant. Block modeling of the individual components of an air-independent power plant, in particular, a high-temperature reactor, a unit for cleaning gas from sulfur and soot, the first and second conversion units, a separator, and a control valve, is considered. Simulation models of individual elements of an air-independent power plant allow you to calculate the dynamic characteristics of a power plant and create algorithms for controlling hydrogen supply valves in transient conditions. Theoretical dependencies for determining the mass flow rates of reagents, temperatures and pressures are given for ideal gases for the purpose of presentation in the LabVIEW environment, taking into account the obtained experimental data for the calculation of maneuvers for regulating pressure at specified operating modes of an air-independent power plant under various operating conditions. The results of the work are described extremely accurately and informatively. The main theoretical and experimental results, actual data, discovered relationships and regularities are presented.

GAS DYNAMIC OPERATING MODES OF LOW PRESSURE GAS NETWORKS DURING TRANSPORT GAS-HYDROGEN MIXTURES

2017 ◽  
Author(s):  
Mariia Serediuk ◽  
Keyword(s):  
Volume Fraction ◽  
Chemical Properties ◽  
Low Pressure ◽  
Gas Networks ◽  
Operating Modes ◽  
Gas Dynamic ◽  
Dynamic Operating ◽  
Hydrogen Mixtures ◽  
Physical And Chemical ◽  
Gas Supply

By means of mathematical modeling the patterns of change the physical and chemical properties, necessary for calculations the gas networks of low pressure, for gas-hydrogen mixtures with volume fraction of hydrogen from zero to 100 % were found. The regularities of gas-dynamic calculations of lowpressure steel gas networks in the case of transportation of gas-hydrogen mixtures with different volume fraction of hydrogen while maintaining the costs and energy consumption of the elements of the gas supply system, typical for the transportation of natural gas were established.

Coordinated Control Strategies between Photovoltaic Power Plant in MW Level and the Power Grid

2012 ◽  
Vol 260-261 ◽  
pp. 518-524
Author(s):  
Kang Ning Wang ◽  
Chao Ying Yang ◽  
Jin Hao Wang ◽  
Lin Liu
Keyword(s):  
Power Generation ◽  
Power Plant ◽  
Large Scale ◽  
Control Strategies ◽  
Coordinated Control ◽  
Storage Device ◽  
Operating Modes ◽  
Photovoltaic Power ◽  
Voltage Support

The paper proposed control strategies for a large-scale photovoltaic power plant in different operating modes in order to improve the utilization of solar energy and power quality of the integration. Take one 3MW photovoltaic power plant as an example, the energy storage device was used as the node to provide frequency and voltage support during the switching period. Then the photovoltaic power generation simulation model was built based on the MW level photovoltaic power plant’s information and data on the PSCAD/EMTDC software platform. This model achieved a coordinated control between photovoltaic power generation and the grid under different operating modes. The simulation result also proved the effectiveness of the control strategies and the significance in ensuring the reliability of power supply and grid stability.

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