A Practical Example of Simulation Assisted Engineering and System Integrated Test for ABWR RIP-MFG System

2009 ◽  
Author(s):  
Hitoshi Ochi ◽  
Atsutoshi Mizuide
Keyword(s):  
Power Supply ◽  
Rotational Inertia ◽  
Design Phase ◽  
Component Level ◽  
Simulation Code ◽  
Generator System ◽  
Recirculation Flow ◽  
Detail Design ◽  
First Case ◽  
Start Up

In Advanced Boiling Water Reactor (ABWR) the recirculation flow is controlled by Reactor Internal Pumps (RIP). For the new construction ABWR plant, Hitachi-GE applied a Motor Fluid coupling Generator system as a power supply of RIPs (RIP-MFG system). In RIP-MFG system, one MFG supplies electric power to five RIPs and controls the speed of RIPs simultaneously. MFG is the highly reliable power supply system and can sustain power supply to RIPs against grid perturbation due to its large rotational inertia [1]. Application for RIP-MFG system to ABWR is world’s first case although both MFG in BWR and RIP in ABWR are proven technologies. Since the recirculation flow system is the key system determining plant operational performance, Hitachi-GE applied Simulation Assisted Engineering (SAE) for RIP-MFG system to get higher reliability for designing RIP-MFG system and keep a plant constructional schedule due to avoid “trial and error” in the start-up test. The design process was broken down into 3 design phases and 7 design steps as follows. Basic design phase consists of step 1 through step 3. Step 1, a simulation code (RIP-MFG code) which contains electronic and hydraulics models for RIP and MFG was developed. Step 2, basic simulation was performed with RIP-MFG code and general inputs. It was concluded that RIP-MFG system would be basically applicable to ABWR recirculation flow control. Step 3, the System Requirements Specification for RIP-MFG system and the component design specifications were documented based upon the simulation. Detail design phase consists of step 4 through step 6. Step 4, The RIP-MFG components were produced and the component level tests were performed. Step 5, RIP-MFG system integrated tests were performed. The objective of the integrated tests was to verify the system design and the RIP-MFG code. The RIP-MFG code outputs have good agreement with both steady state and transient test data. It has concluded that RIP-MFG code is verified. Step6, the RIP-MFG controller parameters are now being evaluated with the verified code. Final test phase consists of step 7. Step 7, the performances of ABWR with RIP-MFG system will be evaluated finally in the plant start-up test.

P-Removal in Completely Mixed Systems

1985 ◽  
Vol 17 (11-12) ◽  
pp. 325-326 ◽  
Author(s):  
H J. G. W. Donker ◽  
P. Opic ◽  
H. P. de Vries
Keyword(s):  
Mixed System ◽  
Domestic Waste ◽  
Recirculation Flow ◽  
Start Up ◽  
Significant Difference ◽  
Aerobic Reactor ◽  
The Difference ◽  
Positive Effect ◽  
Mixed Systems ◽  
P Removal

Ca. 60 % of the Dutch activated sludge plants consist of completely mixed systems, experiments have been carried out in completely mixed pilot plants to study the biological P-removal. The research was carried out in two pilot plants. The pilot plants consisted of: anaerobic reactor, anoxic reactor, aerobic reactor and a clarifier. All the reactors were completely mixed. Both plants were fed with settled domestic waste water at a sludge loading of 400 and 250 g COD/kg sludge.day respectively. The results are given below:sludge loading (g COD/kg sludge.day)400400250ratio Anaerobic : Anoxic : Aerobic1: 1:2,71:1:4,11:1:2,7P-removal (%)802875N-removal (%)505065COD-removal (%)858585 It has been shown that there is no significant difference between the results at the two different sludge loadings. Remarkable is the difference between the ratio 1:1:2,7 in combination with the internal recirculation flow anoxic-anaerobic of 160 % and the ratio 1:1:4,1 with a recirculation flow of 30 %. During the start-up at a sludge loading of 250 g COD/kg sludge.day and an internal recirculation flow of 30 %, bulking sludge developed almost immediately. The Premoval was completely disturbed. Increasing the internal recirculation flow to 160% had a positive effect on settling properties and P-removal. This investigation has pointed out that a completely mixed system is suitable for biological P-removal, without negatively affecting the nitrification. Important factors in the process are the ratio anaerobic:anoxic:aerobic and the recirculation flows.

The development of a Single-Well Oil Production System

1982 ◽  
Vol 307 (1499) ◽  
pp. 279-287
Keyword(s):  
Conceptual Design ◽  
Production System ◽  
Oil Production ◽  
Design Phase ◽  
New Approach ◽  
Detail Design ◽  
Single Well ◽  
Operational Criteria

Since early 1980, BP has been developing the conceptual design of a Single-Well Oil Production System or SWOPS. This paper outlines the concept and discusses the design and the operational criteria that have been applied in this early work. It further examines some of the innovative areas of technology that have been included in this new approach and outlines the work of the detail design phase, which has just started.

Design of a Fuze Power Supply to Small Caliber Time Fuze

2013 ◽  
Vol 433-435 ◽  
pp. 197-200
Author(s):  
Li Hong ◽  
He Zhang ◽  
Hao Jie Li
Keyword(s):  
Energy Storage ◽  
Power Supply ◽  
Start Up ◽  
Hysteresis Characteristics

The modern fuze technology puts forward higher and higher requirements of the fuze power, especially the fast feature of supplying power. Capacitor energy storage power whose energy is from the setter can supply power for fuze before launching the projectile, but its energy is little, so it couldnt satisfy the energy for the fuze work. The turbine alternator can generate power in all the trajectory, so its energy is enough, but it has the hysteresis characteristics of the start-up. This paper puts forward a composite power supply of using two kinds of power supply to solve the requirement of the fast feature of supplying power. Finally, the experiments demonstrate the composite power supply is feasible.

A Research on the Power Match of Generator System of Special Vehicle

2012 ◽  
Vol 580 ◽  
pp. 82-86
Author(s):  
Shi Shun Zhu ◽  
Su Jun Luo ◽  
Hui Xiao ◽  
Gang Yang
Keyword(s):  
Power Supply ◽  
Dynamics Model ◽  
Matching Method ◽  
Generator System ◽  
Special Project ◽  
Special Vehicle ◽  
The Impact ◽  
Power Match

Aimed at the problem of power supply protection on vehicles as the special project platform, making use of the surplus reserve power of vehicles and installing moving shaft generator system is introduced. Dynamics model of vehicle with shaft generator system is established, the impact of shaft generator system to the vehicle is analyzed, and compared with the dynamics of prototype vehicle, the dynamics matching method of vehicle with moving shaft generator system is obtained.

scholarly journals Chaos Predictability in a Chemical Reactor

2020 ◽  
Vol 30 (11) ◽  
pp. 2050221
Author(s):  
Marek Berezowski
Keyword(s):  
Mathematical Model ◽  
Chemical Reactor ◽  
Transient Chaos ◽  
Distant Future ◽  
State Variable ◽  
First Case ◽  
Start Up ◽  
System Temperature ◽  
Intermittent Chaos ◽  
The Mathematical Model

The dynamics of the tubular chemical reactor with mass recycle was examined. In such a system, temperature and concentrations may oscillate chaotically. This means that state variable values are then unpredictable. In this paper, it has been shown that despite the chaos, the behavior of such a reactor can be predictable. It has been shown that this phenomenon can occur in two cases. The first case concerns intermittent chaos. It has been shown that intermittent outbursts can occur at regular intervals. The second case concerns transient chaos, i.e. a situation when chaos occurs only for a certain period of time, e.g. only during start-up. This phenomenon makes it impossible to predict what will occur in the reactor in the nearest time, but, makes it possible to precisely determine the values of the variables even in the distant future. Both of these phenomena were tested by numerical simulation of the mathematical model of the reactor.

Auxiliary Turbine Generator Set Isolation System Design for US Naval Vessel

2012 ◽  
Author(s):  
Paul G. Jones ◽  
Steven L. Carmichael
Keyword(s):  
Finite Element Models ◽  
Component Level ◽  
Sea State ◽  
Turbine Generator ◽  
Full System ◽  
Naval Vessel ◽  
Isolation System ◽  
Actual Performance ◽  
Detail Design ◽  
Machinery Space

The RR4500 Auxiliary Turbine Generator (ATG) incorporates an isolation system addressing four main design requirement environments. These environments include high-impact shock, structureborne vibration, sea state motion, and installation/integration into the machinery space. Multiple design iterations were performed, beginning with a simplified system representation and expanding to full system finite element models. Specific resilient isolation mounts were selected to satisfy the competing criteria from the different requirement sets. Design resolutions passed specific requirements down to the component level and were addressed during detail design. Structures, system components, and flexible ship connections were adapted to meet the requirements needed by the isolation system. Testing of the system indicates good correlation between system predictions and actual performance.

Damped Absorber Optimization and Stability for Semi-Definite Systems Exhibiting Unstable Self-Excitation During Start-Up

1992 ◽  
Vol 114 (1) ◽  
pp. 47-53 ◽  
Author(s):  
J. R. Shadley ◽  
J. R. Sorem
Keyword(s):  
Computer Simulation ◽  
System Dynamics ◽  
Laboratory Testing ◽  
Submersible Pump ◽  
Safe Operation ◽  
Pump System ◽  
Electric Induction ◽  
First Case ◽  
Start Up ◽  
Electric Submersible Pump

Stability is examined with respect to the torque in the elastic element between motor and load in semi-definite systems exhibiting unstable self-excitation during start-up. Equations are provided for optimizing a motor-mounted damped absorber to minimize the torque fluctuations in the shafting between motor and load in semi-definite systems. Minimum damper inertia needed to stabilize the system is computed assuming optimum damping. Stability and damper optimization equations are applied to two cases involving unstable self-excitation in electric submersible pump systems. In the first case, unstable growth of torque amplitude in shafting between an electric induction motor and an inertial load was observed during start-up in laboratory testing. A computer simulation of the system dynamics demonstrated that the torque could be stabilized by adding a damped absorber to the motor. In a computer simulation for the second case, unstable torque fluctuations in the shafting of an electric submersible pump system were dramatically reduced by the addition of a damped absorber; however, stability was not achieved until the damper inertia was sufficiently increased. Stability is not always required for safe operation of electric submersible pumps. A computational model of the system dynamics during startup should be used to determine when stability is required.

Research on Output Current Sharing and Synchronous Start-Up in Parallel Power Supply Modules

2014 ◽  
Vol 1028 ◽  
pp. 262-266
Author(s):  
Chao Huang ◽  
Jian Jun Liao ◽  
Hai Sheng Yu
Keyword(s):  
Power Supply ◽  
Power Supplies ◽  
Output Current ◽  
Advantages And Disadvantages ◽  
Current Sharing ◽  
Large Current ◽  
Start Up ◽  
Distributed Power System ◽  
And Performance ◽  
Switching Mode

With the development of the distributed power system, the paralleled switching mode power supplies are becoming more and more important for large current load. However, paralleled system usually requires load sharing to equalize stresses, and while a lot of techniques have been used, there are many compromises between complexity and performance. This paper introduces the superiority of the power supply modules in parallel, discusses both the advantages and disadvantages of the usual current sharing methods. Finally, some suggestions to enhance redundancy and reliability for current sharing modules have been proposed.

Structural Deformation and Stress Analysis of Aircraft Wing by Finite Element Method

2014 ◽  
Vol 906 ◽  
pp. 318-322 ◽  
Author(s):  
M. Fazlay Rabbey ◽  
Anik Mahmood Rumi ◽  
Farhan Hasan Nuri ◽  
Hafez M. Monerujjaman ◽  
M. Mehedi Hassan
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Structural Properties ◽  
Structural Deformation ◽  
Design Parameters ◽  
Design Phase ◽  
Aircraft Wing ◽  
Detail Design ◽  
The Cost ◽  
Element Method

Wing of an aircraft is lift producing component. It makes aircraft airborne by generating lift>weight. The wing must take the full aircraft weight during flying. So, it is very sophisticated task for designing a wing by keeping consideration of every design parameters simultaneously. This paper contains analysis of structural properties of wing by using finite element method. For well-organized design all the variables must be considered from the beginning of the design phase. The design phases for aircraft are: conceptual, preliminary and detail design. Until the preliminary design phase the aircraft structure is not considered. During these phases the material of the wing should be selected in such a way so that it can perform efficiently with less unexpected phenomena (drag) for which responsible properties are displacement, stress etc. Currently the most focusing area for the aero-elastic investigation is to design wing with good aerodynamic shape which will associated with less dragging structural behavior. It helps to reduce SFC (Specific Fuel Consumption) and so the cost. The analysis on that has done through Computational means as well as simulation technique to develop knowledge about the variation of aircraft wing structural properties.

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