boiling water test loop university of idaho
DESCRIPTION
Dakota Nickerson, Kyle Pflueger , Adam Leschber , Andrew Dahlke M.E. Undergrad. Boiling Water Test Loop University of Idaho . What We Want to Accomplish Today. Provide Insight s found for Initial BWTL Provide Insights found for Proposed BWTL Verify Deliverable for this Project - PowerPoint PPT PresentationTRANSCRIPT
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Boiling Water Test LoopUniversity of Idaho
Dakota Nickerson, Kyle Pflueger, Adam Leschber, Andrew Dahlke
M.E. Undergrad
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What We Want to Accomplish Today
Provide Insights found for Initial BWTL
Provide Insights found for Proposed BWTL
Verify Deliverable for this Project
Verify Component Selection
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BWTL
BWTL- Boiling Water Test Loop
A closed steam loop system that simulates the conditions seen in a Boiling Water Reactor for the purpose of testing nuclear fuel rods in the Advanced Test Reactor (ATR).
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BWTL Design Recieved
Condenser or quench tank
Dem
iner
alize
r
Booster Pump
CondensatePump
Circulating Water
Pressure Control Valve
Flow Elements
IsolationValve
Line heater
Heater Element
TE
TE
TE
TE
PI
Temp – 530FPress – 1050 psig
Temp – 100FPress – 2 psig
Temp – 110FPress – 160 psig
PI
Line heaterFeedwater pump
Temp – 400FPress – 1050 psig
Temp – 120FPress – 600 psig
Temp – 545FPress – 1020 psig
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Problem Identification
The purpose of this project is to design and build a scaled boiling water test loop
that can be used to verify the boiling regime while controlling inlet and outlet
steam qualities.
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Proposed BWTL Design
Line heater
Heater E
lement
Temp – 295 ± 5 FPress – 60 psig
Pressure Relief Valve
Heat Exchanger
PETE
Pump
Temp – 295 ± 5 FPress – 60 psig
PETE
TE
Temp –290 ± 5 FPress – 60 psig
Temp 290 ± 5 FPress – 60 psig
TE
ASME Expansion Tank
1
2
3
456
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Value Gained From This Project
1st Pass Prototype that will provide insight into critical design aspects associated with a Boiling Water Test Loop.
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1: Cartridge Heater
A Chromalox cartridge heater has been chosen to simulate the 18” nuclear fuel rod.
Dimensions are: 18” length, .500” diameter. The manufacturer has told us we can expect 5.6 kW/ft.
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2: Test Section
Option 1: Transparent High Temp Plastic Tube
Poly-Sulfone Rated to 300 F ID of 0.75 in, and OD of 1.00 in. Cost is approximately $100.
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2: Test Section
Option 2: Sight Glass Tube
Glass Pressure vessel.
Can be threaded or flanged directly to pipe.
Rated to 500F and 500 psi
Cost: $600
Recommended Design
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3: Heater
Circular Flow Heater Will Provide 15 kW of energy into system. Accompanied with Control panel that will provide
inlet and outlet temperature.
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4: Pump
Recommended Pump:Manufacturer Model Nominal Capacity at
Maximum SpeedMaximum DifferentialPressure
MaximumTemperature
Cost
GPM PSI ˚F $Viking Pump Heavy duty series-
FH C323 200 800 300-350
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5: Heat Exchanger
Cross flow, shell and tube heat exchanger
Capacity in excess of 20 kW
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6: Expansion Tank
ASME pressure vessel
Will allow room for water to turn to vapor
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Analysis
Linear Heat Rate From The Chromalox Heater:
5.65 kW/ft Required exit quality:
14.6% Assuming inlet quality:
7.5% Expected Scaled Loop Flow Rate:
0.89 gallons per minute
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Critical Heat Flux
Critical Heat Flux is 1944 kW/m2
Our heat flux is 464 kW/m2
Therefore our critical linear heat rate is 23.6 kW/ft – well below heater output
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Design Concerns
Line heater Outlet steam management Pump life Control system Safety Costs
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Total Cost Cartridge Heater: $200 Sight Glass/Test tube: $600 Heater: $1000 Heater Control: N/A Pump: $350 Pump Motor and Speed Control: N/A Heat Exchanger: $1100 Expansion Tank: $800 Stainless Steel Tubing 30 ft: $150 Fittings: $450 Mounting System: $350 Tubing Insulation: $100 Sensors: N/A
Total≈ $5100 + sensors, pump motor, and sensors/control
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Spring 2010 Timeline
Detailed design package completed by January 29
All parts ordered by February 5. Apparatus built by April 9. Trouble shooting and Testing April 16 –
May 7
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SpecificaitonsDescription Function Specification
1 Test Section Heater Simulates nuclear fuel rod. 220 V and 300 W/in2
2 Transparent Test Section Allows a person to see the boiling regime on the heater
Polysulfone plastic, operates at 295 ±5 F and vapor pressure of water at 295 ± 5 F.
3. Line Heater Adds energy to the water so that the quality of the water at the test section inlet can be adjusted.
Operates at vapor pressure of water at 295 ± 5 F, and has a 15 kW capacity.
4 Pump Pressurizes test section and circulates water
Operates at the vapor pressure of water at 295 ± 5 ˚F and can support the head seen in the system while maintaining the satisfying a flow rate varying from 0.0-3.0 gpm.
5 Heat Exchanger Takes energy out of the circulating water
Operates at vapor pressure of water at 295 ±5 F and removes up to 20 kW energy from water.
6 Expansion Tank Allows for expansion of the water in the loop when vapor occurs
Operates at vapor pressure of water at 295 ±5 F and supplies excess volume in loop for steam expansion.
Temp. Elements Measures the temperature at different places in the loop.
Operates at vapor pressure of water at 295 ±5 F sends an electrical signal which can be input to a data acquisition system. Likely a J type thermo couple.
Pressure Elements Measures the pressure at different places in the loop.
Operates at vapor pressure of water at 295 ± 5 F and sends an electrical signal which can be input to a data acquisition system.