case study: hydrogen production power optimization
TRANSCRIPT
CASE STUDY: HYDROGEN PRODUCTION POWER OPTIMIZATION
Megan ReusserSenior Development Engineer Global Syngas
Technologies ConferenceOctober 12, 2021
Need for Hydrogen Production & Storage
100% Decarbonization
Goals
Energy Storage
Uses in Other Industries
Power Generation
Transportation
Power Generation
Turbines► Major OEMs committing to
capabilities to burn 100% in future advanced class machines
► Existing turbines currently limited to a mixing ratio• Approximately 30% (by volume)
► NOX and performance impacts
EXAMPLE – Power Required for 30% H2 Blend
-100
0
100
200
300
400
500
600
700
800
50MW SCGT 250MW SCGT 700MW CCGT
Load
, MW
Rated Capacity, MW Elecrolysis Load, MW Net Output, MW
*Based on Realtime hydrogen production via electrolysis
Negative Net Output
Positive Net Output
Hydrogen Production Round Trip Efficiency
100% 25-40%
Electrical Grid (or other users)
Renewables
Grid
Electrolysis Storage TurbineCompressionor
Hydrogen Storage Options
Compressed Gas Storage
Liquid Hydrogen Storage
Mor
e Po
wer
Req
uire
dLess Pow
er Required
CASE STUDY – Hydrogen Fuel Blending
► Process facility owner wants to blend hydrogen into fuel gas system• Goal of CO2 reduction• Turbine Driven Compressor (25 MW)• 5% (by volume) – Approximately 75 lb/hr of
hydrogen
► Produce hydrogen on-site via electrolysis• 2.5 MW Electrolyzer• Produces approximately 100 lb/hr of
hydrogen
► Time of Use• Peak ($0.265/kWh) – Daily from 4PM to 8PM • Off-Peak ($0.044/kWh) – All other hoursHydrogen (5%)
Natural Gas (95%)
Option 1 – Electrolyzer Always On
Drives Process
CompressorGrid Electrolysis Storage TurbineCompression
Option 1 – Electrolyzer Always On
Drives Process
CompressorGrid Electrolysis Storage TurbineCompression
75 lb/hr
Option 2 – Cycle On/Off during Peak Hours
Drives Process
CompressorGrid Electrolysis Storage TurbineCompression
90 lb/hr 90 lb/hr 75 lb/hr90 lb/hr
Peak – 4 Hours
Option 2 – Cycle On/Off during Peak Hours
Drives Process
CompressorGrid Electrolysis Storage TurbineCompression
75 lb/hr90 lb/hr
Off-Peak – 20 Hours
15 lb/hr 15 lb/hr
Results
Description Duration(Hours)
Electrolyzer Power(kW)
Compressor Power (kW)
Total Power (kW)
Total Power per Day (kWh)
Price($/kWh)
Cost per Year
($/year)
OPTION 1 – Electrolyzer Always OnPeak Time 4 1,700 0 1,700 6,800 $0.267 $662,694
Off-Peak 20 1,700 0 1,700 34,000 $0.044 $546,040
Total 24 3,400 0 3,400 40,8000 $1,208,734
OPTION 2 – Cycle On/Off during Peak HoursPeak Time 4 0 0 0 0 $0.267 $0
Off-Peak 20 2,100 50 2,150 43,000 $0.044 $690,580
Total 24 2,100 50 2,150 43,000 $690,580
Results
Description Duration(Hours)
Electrolyzer Power(kW)
Compressor Power (kW)
Total Power (kW)
Total Power per Day (kWh)
Price($/kWh)
Cost per Year
($/year)
OPTION 1 – Electrolyzer Always OnPeak Time 4 1,700 0 1,700 6,800 $0.267 $662,694
Off-Peak 20 1,700 0 1,700 34,000 $0.044 $546,040
Total 24 3,400 0 3,400 40,8000 $1,208,734
OPTION 2 – Cycle On/Off during Peak HoursPeak Time 4 0 0 0 0 $0.267 $0
Off-Peak 20 2,100 50 2,150 43,000 $0.044 $690,580
Total 24 2,100 50 2,150 43,000 $690,580
~43% cost savings
~5% power increase
What if Peak-time pricing wasn’t a factor?
Description Duration(Hours)
Price($/kWh)
Cost per Year
($/year)
OPTION 1 – Electrolyzer Always OnPeak Time 4 $0.267 $662,694
Off-Peak 20 $0.044 $546,040
Total 24 $1,208,734
OPTION 2 – Cycle On/Off during Peak HoursPeak Time 4 $0.267 $0
Off-Peak 20 $0.044 $690,580
Total 24 $690,580
Description Duration(Hours)
Price($/kWh)
Cost per Year
($/year)
OPTION 1 – Electrolyzer Always OnPeak Time 4 $0.044 $109,208
Off-Peak 20 $0.044 $546,040
Total 24 $655,248
OPTION 2 – Cycle On/Off during Peak HoursPeak Time 4 $0.044 $0
Off-Peak 20 $0.044 $690,580
Total 24 $690,580
$0.044/kWh
Other Power ConsiderationsPurchased vs. Excess Renewable
Storage Pressure
and Volume
Financial Impacts
Electrolyzer Size
Competing Technologies
Use Case
H2 Production and Storage is Energy
Intensive
Multiple Variables
Complex Analysis
Evaluate the Whole
System
No “One-Size Fits All” Solution
SUMMARY
