oil‐free, high-temperature heat transfer fluid circulator · 2019-04-17 · seto csp program...
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SETO CSP Program Summit 2019energy.gov/solar-office
SETO CSP Program Summit 2019
Oil‐Free, High-Temperature Heat Transfer Fluid Circulator
Mohawk Innovative Technology, Inc.Award # DE-EE000837409/01/18 – 11/31/1801/09/2019 Date
James F. Walton II, Vice President & Program Manager
SETO CSP Program Summit 2019
MITI Oil-Free MachineryAerospace
Air Cycle MachinesIndustry
Air Compressors
2
Defense Gas Turbine Engines
Copyright © 2019 MiTi®
Energy Turbomachinery
SETO CSP Program Summit 2019
Project Objectives
• Develop High-Temperature Heat Transfer Fluid (HTF) Circulator for Gas Phase Pathway CSP Systems • 1.5 MWth Thermal Load Prototype HTF Circulator
• Pressure Rise 1 or 5 to ~50 Bar
• Inlet Temperature ~550°C w/ potential to 700°C
• Inlet Pressure 73 to 90 Bar and/or 125 Bar to ~240 Bar
• Scalable to 100 MWth Commercial System
• Proof Test
• Potential Demonstration at DOE Site under Phase III
SETO CSP Program Summit 2019
• Operating Conditions (High Pressures & Temperatures)
• Accommodate Disparate Operating Conditions
• High Inlet Temperature and Pressure
• Inlet & Discharge Pressures Vary 2:1
• Speed Ratio: 2:1
• System Design
• Aero Efficiency/Windage/Bearing Losses
• Thrust Balance Due to High Pressure
• Drive System Thermal Management
Key Technical Challenge
4
SETO CSP Program Summit 2019
• Holistic System Design• Aerodynamic Design
• Single & Multi-Stage
• System Tradeoffs
• Impeller Efficiency
• Windage Losses
• Motor Speed & Power
• Thermal Management
• Isolate Motor from Hot HTF
• Thrust Balance Due to High Pressure
Key Technical Challenge – Solution Approach
50
20
40
60
80
100
120
10000 30000 50000 70000 90000 110000 130000
Po
we
r (k
W)
Speed (rpm)
1-Stage Circulator Power vs Speed & Wheel Diameter
1-Stage-40 mm 1-Stage-45 mm 1-Stage-50 mm 1-Stage-55 mm 1-Stage-60 mm
1-Stage-70 mm 1-Stage-84 mm 1-Stage-90 mm 1-Stage-100 mm
Generate & Charge
Charge
Generate
Discharge
Increasing Diameter and Reducing Speed
SETO CSP Program Summit 2019
Efficiency Comparison for Three Configurations
65%
70%
75%
80%
85%
90%
1.00
1.05
1.10
1.15
1.20
1.25
8.0 10.0 12.0 14.0 16.0 18.0 20.0
Effi
cie
ncy
Pre
ssu
re R
atio
Flow (L/s)
Efficiency & Pressure-Ratio vs Volumetric Flow
P_Ratio 2-Stage Series-40 mm 1-Stage-40 mm parallel 40 mm
65%
70%
75%
80%
85%
90%
20000
40000
60000
80000
100000
120000
8.0 10.0 12.0 14.0 16.0 18.0 20.0
Effi
cien
cy
Spe
ed
(rp
m)
Flow (L/s)
Efficiency & Speed vs Volumetric Flow
Speed-1Stage Speed-2Series Speed-Parallel
1-Stage-40 mm 2-Stage Series-40 mm parallel 40 mm
SETO CSP Program Summit 2019
Efficiency Comparison for Three Configurations
65%
70%
75%
80%
85%
90%
20000
40000
60000
80000
100000
120000
8.0 10.0 12.0 14.0 16.0 18.0 20.0
Effi
cien
cy
Spee
d (
rpm
)
Flow (L/s)
Efficiency & Speed vs Volumetric Flow
Speed-1Stage Speed-2Series Speed-Parallel
1-Stage-40 mm 2-Stage Series-40 mm parallel 40 mm
Dis
char
ge 6
3%
Gen
erat
e 2
%
Generate & Charge 33%
Charge 2%
IPLV Efficiency
2-Stage Series 83.6%
1 Stage 83.3%
2-Parallel 78.0%
Without Windage. Bearing or Electromechanical Losses
SETO CSP Program Summit 2019
1-Stage Impeller Compression Power vs Speed & Diameter
83.526 kW 41.042 kW
81.181 kW
20.685 kW
10000
12000
14000
16000
18000
20000
22000
24000
26000
28000
0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 2.5
Pre
ssu
re (k
Pa)
Mass Flow (kg/s)
Performance Map - Pressure
Gen and Charge/Disch (81500 rpm) Generate (56800 rpm)
Charge (80000 rpm) Discharge (40000 rpm)
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 2.5
Effi
cie
ncy
Mass Flow (kg/s)
Performance Map - Efficency
Gen and Charge/Disch (81500 rpm) Generate (56800 rpm)
Charge (80000 rpm) Discharge (40000 rpm)
81.5 krpm;
83.53 kW;
56.8 krpm;
41.04 kW;
80 krpm;
81.18 kW;
40 krpm;
20.69 kW;
SETO CSP Program Summit 2019
High Temperature Recycle Blower with 700⁰C Inlet Air
Thermal Management
SETO CSP Program Summit 2019
Successful Project Impact
• High Temperature Circulator/Compressor Developed
• Enabler for CSP Gen3 Gas Phase Pathway
• Sized for Pilot Demonstration System
• Spiral Developments/Applications
• Other DOE Solar and SCO2 Power Systems
• High Temperature Recycle Blowers For SOFCs
• Syngas Processing
• Kiln Drying (Cement Plants, Wood, etc.)
• Food and Pharmaceutical Applications