The Modeling and Dynamic Simulation of U-Tube Steam Generator

2013 ◽  
Vol 401-403 ◽  
pp. 400-403
Author(s):  
Jian Qiang Gao ◽  
Hai Kun Xing ◽  
Xin Sun ◽  
Nan Nan Xue
Keyword(s):  
Dynamic Simulation ◽  
Steam Generator ◽  
Simulation Experiment ◽  
Natural Circulation ◽  
Water Side ◽  
Primary Water ◽  
Lumped Parameters ◽  
The Mathematical Model ◽  
Circulation Evaporator ◽  
Tube Metal

For comprehensive research on the dynamics of U-tube natural circulation evaporator in plant, the modular and lumped parameters method is used to establish the mathematical model of U-tube steam generator. Steam generator is divided into three parts in the model: primary water side, U-tube metal side and secondary water side. Secondary water side includes five modules. Then, the dynamic simulation experiment can be made on the basis of the simulation model. The experiment results consistent with the actual data and the adaptability and rationality of the model are verified.

Thermal-hydraulic Design of Natural Circulation Integrated Steam Generator Using Design Map

2021 ◽  
pp. 117389
Author(s):  
Namhyeong Kim ◽  
Hyungmo Kim ◽  
Jaehyuk Eoh ◽  
Moo Hwan Kim ◽  
HangJin Jo
Keyword(s):  
Steam Generator ◽  
Natural Circulation ◽  
Hydraulic Design

Development of Repair Technologies for J-Groove Welds of Drain and Instrument Nozzle in Steam Generator

2009 ◽  
Author(s):  
Kwang Soo Park ◽  
Chang Sig Kong ◽  
Seon Ho Lee ◽  
Woo Sung Kim
Keyword(s):  
Steam Generator ◽  
Welding Process ◽  
Outer Wall ◽  
Field Application ◽  
Repair System ◽  
Monitoring Tool ◽  
Welding Equipment ◽  
Gas Tungsten Arc ◽  
Primary Water ◽  
Remote Welding

SG drain & instrument nozzles and their welds fabricated with alloy 600 and alloy 82/182 is susceptible to Primary Water Stress Corrosion Cracking (PWSCC). In Korea, the cracks due to PWSCC were discovered in the drain nozzle of Yongkwang units 3 & 4. Doosan has developed a system for steam generator to repair damaged drain nozzle & welds and to prevent further damage on the instrument nozzle & welds. The repair system consists of machining, welding equipment and installation tool for this equipment. The machining equipment is used to remove the nozzle and J-groove welds. The process is called mechanical machining and the main equipment is installed on steam generator’s outer wall. The welding equipment is designed for the machined J-groove welds and overlay. The auto welding equipment consists of welding head, controller, monitoring tool and Gas Tungsten Arc Welding (GTAW) power supply. Doosan has developed remote welding process using the monitoring tool. The installation tool consists of automatic installment tool for instrument nozzle and manual installment tool for drain nozzle. Doosan successfully completed a mockup test and field application for Yongkwang unit 3.

scholarly journals Gas Turbine Heat Recovery Steam Generators for Combined Cycles Natural or Forced Circulation Considerations

1988 ◽  
Author(s):  
Akber Pasha
Keyword(s):  
Gas Turbine ◽  
Steam Generator ◽  
Heat Recovery ◽  
Power Plants ◽  
Natural Circulation ◽  
Combined Cycle ◽  
Heat Recovery Steam Generator ◽  
Steam Generators ◽  
Forced Circulation ◽  
Gas Turbine Exhaust

In recent years the combined cycle has become a very attractive power plant arrangement because of its high cycle efficiency, short order-to-on-line time and flexibility in the sizing when compared to conventional steam power plants. However, optimization of the cycle and selection of combined cycle equipment has become more complex because the three major components, Gas Turbine, Heat Recovery Steam Generator and Steam Turbine, are often designed and built by different manufacturers. Heat Recovery Steam Generators are classified into two major categories — 1) Natural Circulation and 2) Forced Circulation. Both circulation designs have certain advantages, disadvantages and limitations. This paper analyzes various factors including; availability, start-up, gas turbine exhaust conditions, reliability, space requirements, etc., which are affected by the type of circulation and which in turn affect the design, price and performance of the Heat Recovery Steam Generator. Modern trends around the world are discussed and conclusions are drawn as to the best type of circulation for a Heat Recovery Steam Generator for combined cycle application.

Gas Storage Cavity Simulation Experiment Research and Application

2014 ◽  
Vol 496-500 ◽  
pp. 891-895
Author(s):  
Ji Fang Wan ◽  
Rui Chen Shen ◽  
Zhong Yuan Ji ◽  
Jing Bin Xie
Keyword(s):  
Simulation Experiment ◽  
Gas Storage ◽  
Salt Rock ◽  
Experiment Research ◽  
Solution Mining ◽  
Drill Site ◽  
Similarity Ratio ◽  
Rock Model ◽  
Salt Caverns ◽  
The Mathematical Model

The real salt cores from drill-site was regarded as the prototype in this experiment. They are used to simulate solution mining process of salt caverns. In this paper the mathematical model of solution mining wasset up.Experimental parameters are obtained by similarity ratio. Afternumerous experiments on the artificial salt rock model,the results show that thecontrol experimental parametersand the references design are effective.This researchhas some guidance on field engineering of solution mining construction.

Combined-Cycle Start-Up Procedures: Dynamic Simulation and Measurement

2016 ◽  
Author(s):  
Nicolas J. Mertens ◽  
Falah Alobaid ◽  
Bernd Epple ◽  
Hyun-Gee Kim
Keyword(s):  
Power Plant ◽  
Dynamic Simulation ◽  
Steam Generator ◽  
Heat Recovery ◽  
Thermal Stresses ◽  
Measurement Data ◽  
Combined Cycle ◽  
Heat Recovery Steam Generator ◽  
Start Up ◽  
Fast Start

The daily operation of combined-cycle power plants is increasingly characterized by frequent start-up and shutdown procedures. In addition to the basic requirement of high efficiency at design load, plant operators therefore acknowledge the relevance of enhanced flexibility in operation — in particular, fast start-ups — for plant competitiveness under changing market conditions. The load ramps during start-up procedure are typically limited by thermal stresses in the heat recovery steam generator (HRSG) due to thick-walled components in the high pressure circuit. Whereas conventional HRSG design is largely based on simple steady-state models, detailed modelling and dynamic simulation of the relevant systems are necessary in order to optimize HRSG design with respect to fast start-up capability. This study investigates the capability of a comprehensive process simulation model to accurately predict the dynamic response of a triple-pressure heat recovery steam generator with reheater from warm and hot initial conditions to the start-up procedure of a heavy-duty gas turbine. The commercial combined-cycle power plant (350 MWel) was modelled with the thermal-hydraulic code Apros. Development of the plant model is based on geometry data, system descriptions and heat transfer calculations established in the original HRSG design. The numerical model is validated with two independent sets of measurement data recorded at the real power plant, showing good agreement.

Natural Circulation and Creep Damage Analyses of Severe Accident for a Typical PWR Plant

2009 ◽  
Author(s):  
Osamu Kawabata ◽  
Masao Ogino
Keyword(s):  
Steam Generator ◽  
Natural Circulation ◽  
Reactor Core ◽  
Creep Damage ◽  
Reactor Vessel ◽  
Reactor System ◽  
Severe Accident ◽  
Steam Generator Tube ◽  
Hot Gas ◽  
Core Meltdown

When the primary reactor system remain pressurized during core meltdown for a typical PWR plant, loop seals formed in the primary reactor system would lead to natural circulations in hot leg and steam generator. In this case, the hot gas released from the reactor core moves to a steam generator, and a steam generator tube would be failed with cumulative creep damage. From such phenomena, a high-pressure scenario during core meltdown may lead to large release of fission products to the environment. In the present study, natural circulation and creep damage in the primary reactor system accompanying the hot gas generation in the reactor core were discussed and the combining analysis with MELCOR and FLUENT codes were performed to examine the natural circulation behavior. For a typical 4 loop PWR plant, MELCOR code which can analyze for the severe accident progression was applied to the accident analyses from accident initiation to reactor vessel failure for the accident sequence of the main steam pipe break which is maintained at high pressure during core meltdown. In addition, using the CFD code FLUENT, fluid dynamics in the reactor vessel plenum, hot leg and steam generator of one loop were simulated with three-dimensional coordinates. And the hot gas natural circulation flow and the heat transfer to adjoining structures were analyzed using results provided by the MELCOR code as boundary conditions. The both ratios of the natural circulation flow calculated in the hot leg and the steam generator using MELCOR code and FLUENT code were obtained to be about 2 (two). And using analytical results of thermal hydraulic analysis with both codes, creep damage analysis at hottest temperature points of steam generator tube and hot leg were carried out. The results in both cases showed that a steam generator tube would be failed with creep rupture earlier than that of hot leg rupture.

Dynamic Modeling of an Overhead Valve Engine CAM-Follower System Using a Resistive Companion Dynamic Simulation Solver

2005 ◽  
Author(s):  
Daniel C. Sloope ◽  
David N. Rocheleau
Keyword(s):  
Mathematical Model ◽  
Dynamic Simulation ◽  
Dynamic Modeling ◽  
Valve Train ◽  
Test Bed ◽  
Virtual Test ◽  
Virtual Test Bed ◽  
Cam Follower ◽  
Valve Engine ◽  
The Mathematical Model

A computer simulation model of the valve train of a Honda GX30 engine was modeled using Virtual Test Bed (VTB), a resistive companion dynamic simulation solver. Traditionally VTB has been exclusive to solving electrical system models but using the resistive companion equivalence of through and across variables, it can be applied to mechanical systems. This paper describes a dynamic simulation of an overhead valve engine cam-follower system using the VTB software application. The model was created to show valve train position, velocity and acceleration to aid in development of a camless engine being developed at the University of South Carolina. The mathematical model was created using governing dynamic equations. Using C++ programming, the mathematical model was transformed into a Virtual Test Bed model. The VTB model successfully shows valve train component position, velocity and acceleration. The significance of this work is its novelty in using the Virtual Test Bed environment to handle dynamic modeling of mechanical systems, whereas to date, VTB has been primarily focused on resistive companion modeling of power electronic systems. This work provides the foundation for using VTB to tackle more complex mechanical models.

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