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Learn the basics of biogas use and its current role in Wisconsin. Next, manufacturers will talk about biogas systems and requirements. Lastly, fleets will talk about their firsthand experience using biogas as a transportation fuel.
Citation preview
Biogas to Vehicle CNG
Wisconsin Clean Cities November 5, 2013
Biogas/Vehicle Fuel Benefits
• “Home grown” Fuels
– Lock in your future fuel cost long term
• Green Fuel- RNG has the smallest carbon footprint of any commercial vehicle fuel
• Complies with CNG fuel specs and engine warranties
2
BioCNG Is….
A Patent pending system to convert
biogas from an anaerobic digester or a
landfill to a gaseous vehicle fuel.
CNG Terms and Definitions
CNG - Compressed Natural Gas
LNG - Liquid Natural Gas
RNG - Renewable Natural Gas (BioCNG™)
GGE - Gasoline Gallon Equivalent, 116,000 BTU/Gal
DGE - Diesel Gallon Equivalent, 130,000 BTU/Gal
Biogas - Methane (CH4) and carbon dioxide (CO2) produced from the breakdown of waste by bacteria in wastewater treatment facilities and landfills
RIN - A Renewable Identification Number is a serial number assigned to a batch of biofuel for the purpose of tracking its production, use, and trading
Things to Consider
CNG vehicles on site or in future budget? How many vehicles?
What type of vehicles?
How often do they need to fill up?
Time or fast fill?
Is suitable biogas available?
Is natural gas available on site?
Existing infrastructure CNG infrastructure
Biogas Conditioning System
Biogas Quality
BioCNG™ System Process Flow Diagram
Biogas Source
(Digester, Landfill
BioCNG™ Gas Conditioning
System
CNG Vehicle Fueling System
CNG Vehicles
Hydrogen Sulfide
Removal
Gas Compression/
Moisture Removal
Siloxane/ VOC
Removal
Control Panel
Glycol Chiller
Carbon Dioxide
Removal
10
BioCNG Models
CNG Fueling
12
Identifying the Fuel Needs Vehicle Fueling Capability
Model Ford F150 Waste Hauler School Bus
BioCNG™ 50 16 5 4
BioCNG™ 100 32 10 8
BioCNG™ 200 64 20 16
* Assumes 1 fill per day per vehicle
• Dane County, WI Rodefeld Landfill
• Developed with private, municipal, and educational entities
• System installation – December 2010
• Upgraded to 50 SCFM/ 250 gge/day in 2012
• 19 county light duty vehicles – more planned
• 6.4 MW LFGTE plant operational on site – excess gas
• 2011-US EPA’s LMOP Project of the Year Award
Dane County, WI Project Information
14
Dane County, WI Rodefeld Landfill
15
Dane County, WI Rodefeld Landfill
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Dane County, WI Rodefeld Landfill
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City of Janesville, WI WWTP Janesville, WI WWTP
Overview
Founded in 1835
Located on the Rock River, in southeast Wisconsin
Area: 33 sq miles
Population: 63,500
Design Capacity of 19.8 million gallons of sewage per
day (MGD)
Thermophilic-mesophilic anaerobic digestion
Produces 100,000 to 130,000 ft3 per day of digester gas
Generates 1,600 dry tons of biosolids per year
City of Janesville, WI WWTP Janesville, WI WWTP
Timeline
November 2010
July 2011
January 2012
March 2012
Summer 2012
(4) CR65-ICHP
Capstone
MicroTurbines
140scfm Gas
Conditioning System
BioCNG Add-On
(1) CR200 Capstone
MicroTurbine
Gas Storage
Sphere
Vehicle Fueling
Station
PHASE 1 PHASE 2
City of Janesville, WI WWTP Janesville, WI WWTP
BioCNG Storage and Filling Station
100 gallons
gasoline
equivalent
storage sphere.
Fill-up time
comparable to
conventional
fuel station.
Gas treatment and microturbines inside
Digester with gas storage
Chiller Compressor
Fuel dispenser
High Pressure
Gas Storage
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Sacramento South Area Transfer Station
Organic Waste Recycling Center and Renewable Natural Gas Fueling Station
Sacramento, CA
Sacramento-Atlas Disposal Fleet
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Sacramento, CA Project Information
• Food Waste Digester- Clean World Partners • Start Up Date-May 2013 • 25-100 TPD • BioCNG 100 & BioCNG 200 • 100-300 scfm • 500-450 GGE/day • Clean Energy Fueling Station • Fueling Sacramento/Atlas Disposal trucks and other third party fleets
Summary • Proven technology
• Lowest cost fuel
• Long term fixed fuel cost
• Meets CNG fuel specs
• Complies with engine manufacturers warrantees
• Lowest carbon footprint (greenest fuel)
• Scales down for small biogas generators
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Efficiency of BioCNG to Convert Methane into Vehicle Fuel
50
55
60
65
70
60 65 70 75 80 85 90
Raw
Bio
gas
Me
than
e C
on
cen
trat
ion
Percent Methane Conversion to Vehicle Fuel
Figure 1 - BioCNG Methane Efficiency
Typical LFG Typical Digester Gas
Environmentally Superior Fuel
“RENEWABLE NATURAL GAS (RNG): The Solution to a Major Transportation Challenge,” Energy Vision, New York, September 2012
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Biogas/Vehicle Fuel System Economics
29
Biogas Inlet and Outlet
Raw LFG
CH4 50 to 60%
CO2 40 to 50%
O2 0 to 1.5%
N2 0.5 to 5%
H2S Up to 1,500 ppmv
Siloxane Up to 1,500 ppmv
Trace Others <1%
Water 0.40%
Product BioCNG Fuel
CH4 88 to 96%
CO2 0.2 to 1.0 %
O2 0.0 to 1.0%
N2 0 to 10 %
H2S Non Detect
Siloxane Non Detect
H2O Per CNG
Requirements
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The CNG Revolution • Gasoline and diesel costs continue to rise
• Natural gas is abundant and has a lower unit energy cost than petroleum fuels.
• Fleets are converting to CNG for cost savings
• Natural Gas / CNG will play a role in our nation’s energy security and independence
• CNG has environmental benefits over Gasoline and Diesel
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What is CNG? • Natural gas compressed to 3,000-5,000 psi
• CNG is used worldwide as a vehicle fuel
– 15,000,000 vehicles worldwide
– Approx. 200,000 vehicles in US growing rapidly
– Powers small and large vehicles (scooters to semis)
• Renewable Natural Gas (RNG) fuel is from renewable biogas sources
– Landfills, WWTP digesters, Organic waste /food waste digesters, dairy/ agricultural digesters
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Today’s Presentation
• CNG overview
• Biogas/vehicle fuel opportunities
• BioCNG in Wisconsin
33
Efficiency of BioCNG to Convert Methane into Vehicle Fuel
• Methane efficiency of the BioCNG system varies depending on the concentration of methane the raw biogas.
• Methane not converted to vehicle fuel is routed with the carbon dioxide waste gas to be destroyed in a boiler, flare or micro turbine.
• If the waste gas is routed to a boiler, micro turbine, or other recovery system the methane efficiency may approach 100%.
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