Small Scale Renewable Energy Power System with Hydrogen Combustion

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Presentation transcript:

Small Scale Renewable Energy Power System with Hydrogen Combustion Curt Robbins, Rick Purcell, Larry Sheetz, Roger Jacobson, Alan Gertler Desert Research Institute NHA Hydrogen Conference March 31st, 2008

Outline Background/Rationale System Description Applications Testing Performance Efficiency Suggested improvements Summary

Background Estimated 10,000 Off-Grid locations in Nevada Cost of up to $500,000 for grid connection in remote locations

Project Objective Design, build and test a small scale renewable energy power system. Solar and wind renewable sources Batteries, hydrogen and propane

Applications Residential and industrial (i.e. mines) off-grid locations Military uses Remote scientific experiments requiring energy Natural disasters

System Design Existing external renewable energy sources Power system located in mobile trailer Hydrogen, propane and batteries for 24/7 power security Mobility avoids permitting

System Schematic

Trailer Picture

Components Dual inverters (48 VDC to 120 VAC) 1.3 kWhr energy in twelve 12 VDC gelled-electrolyte battery bank Proton Energy HOGEN 600 Electrolyzer and Stuart KOH electrolyzer Off the shelf, designed for laboratory use 4 hydrogen tanks in trailer and 1 permanent hydrogen tank Two propane tanks on front of trailer Dual fuel ICE-Hydrogen/Propane Solar panels and wind turbine

Engine vs. Fuel Cell Decision Based on previous projects and nature of project Fuel Cell previously tested Cost at start of project 5 years ago Customer maintainability Power security-multiple fuels Longevity/Reliability

Hydrogen Production Proton Energy HOGEN 600 Stuart KOH Produces 600 cc/min H2 at observed 500W Backpressure regulator and mass flow control Designed for laboratory use .03 kg/hr at 1500 W consumption Stuart KOH Stationary in cargo container at DRI .1 kg/hr H2 at 5 kW consumption

Hydrogen Storage Four small gas storage tanks 200 PSI (from electrolyzer) Capacity of .2 kg Hydrogen Manifold for distribution and monitoring

Hydrogen Combustion Lister Petter Stanford AC Generator 2 cylinder 4 stroke, carbureted, turbocharged Converted by Collier Technologies Modified ignition system & spark Dual fuel hydrogen and propane Individual spark timing Computer Unit Controls Stanford AC Generator 1800 RPM

Test Location 1 Residence in SW Reno, NV 1.5 kW tracking solar array HOGEN 600 Trailer hydrogen storage tanks 21 kW-hr/day Winter Load demand

Test Location 2 Desert Research Institute Two 1 kW rated tracking solar arrays and two 1.5 kW wind turbines HOGEN 600 and Stuart Electrolyzer Trailer hydrogen storage plus stationary hydrogen tank 6.5 kW-hr/ day summer load demand

Test Load Demand

Performance Site 1 Site 2 Future design would require more capacity Load demand too large for system No access to second solar array Load bank as demand Some continuous operation and some system faults over 1 month six 40-90 minute engine cycles required per day or ~2 kg hydrogen Site 2 Appropriate load demand Extra hydrogen production and storage Power security Two 50 minute minimum engine cycles required per day or ~.65 kg hydrogen Future design would require more capacity

Efficiency Power Output BTU’s of Fuel Low Power

Suggested Improvements Simplify for cost reduction Controls Electrolysis Maximize efficiency/Wrong application Fuel cell improvement since project began New technologies Hydrogen storage Ultra-capacitors Engine improvements

Summary A reliable and robust mobile R.E. power system with hydrogen combustion was developed and tested Used available technologies Integration and mobility key aspects Engine reliability biggest issue Costs still high 1st step for production Power security for a wide range of applications Energy source on site Waste heat for hot water system

Acknowledgements NREL - Financial support John Sagebiel – Residential Site Kirk Collier, Collier Technologies Arne LaVen

Questions ?