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Biogas Treatment and Combined Heat and Power (CHP) Combined Heat and Power (CHP) John L. Willis, P.E., BCEE, Brown AND Caldwell
Biogas Treatment and Combined Heat and Power (CHP)Combined Heat and Power (CHP)John L. Willis, P.E., BCEE, Brown AND Caldwell
Overview
• CHP Overview
• CHP Technologies
• Tools and Future Resources
CHP O i
Biogas Treatment and Combined Heat and Power (CHP)
CHP Overview
Methane from Sewage Taps Significant Potential Energy
• Much digester gas is currently flared (wasted)
B t f t t bl • Best source of wastewater renewable power production is:
COD > CH > CO + gCOD -> CH4 -> CO2 + energy
• Integral element to self-sufficient POTWs:• Strass - Austria• Point Loma - San Diego, CA• Carson JWPCP – LA County, CA
EBMUD O kl d CA• EBMUD – Oakland, CA
Payback is Improved with
• Higher power costs
Bigg l t• Bigger plants
• More gas – enhanced digestion/supplements
• Higher efficiency CHP options
• Higher GHG – REC value
Most Important:
An Enhancement with a Payback
Common, Wrong Way to Look at Biogas
The Better, CHP Way to Look at Biogas
CHP T h l i
Biogas Treatment and Combined Heat and Power (CHP)
CHP Technologies
Flow Sheet for Combustion Turbines
Joint Water Pollution Control Plant
• LACSD - Carson, CA
300 MGD• 300 MGD
• Combustion TurbineSolar Mars 90 (Three)• Solar Mars 90 (Three)
• 9 MW• 18 MW total output
• Combined Cycle• Additional 7 MW
Flow Sheet for Internal Combustion Engine
Point Loma WWTP
• San Diego, CA
160 MGD• 160 MGD
• Internal Combustion EngineEngine• Caterpillar 3612 (Two)• 2.3 MW• 4.6 MW total output
• Excess Digester Gas is Fl dFlared
Flow Sheet for Microturbine
Lancaster WRP
• LACSD - Lancaster, CA
15 MGD• 15 MGD
• MicroturbineIngersoll Rand (One)• Ingersoll-Rand (One)
• 250 kW• 190 kW total output
• Steam Boilers• Fueled by digester gas• Digester heating
Flow Sheet for Fuel Cell
Riverside WQCP
• Riverside, CA
40 MGD• 40 MGD
• Fuel CellFuelCell Energy• FuelCell Energy
• DFC 1500 MA• 300 kW/stack• 1000 kW total output
• $4.5 Million SGIP
T l d F t R
Biogas Treatment and Combined Heat and Power (CHP)
Tools and Future Resources
WERF’s LCAMER Tool
Brown and Caldwell | October 2, 2010
CHP-SET Tool Overview
Prime Mover
Efficiency Efficiency at
Various LoadsLoads
System Overview
EmissionsOverview
Ancillary Loads are Subtracted from
System Efficiency
WERF Barriers to Biogas Utilization for Renewable Energy• Future/Ongoing effort
• 4 Focus Groups:p• WEF Nutrient – Miami (Jan)• NYWEA – New York City (Feb)• WEF Biosolids – Sacramento (May)• WEF Water/Energy – Chicago (Aug)
• Participate in WERF’s “Barriers” discussion if you:• Do not have digesters but are considering themg g• Have digesters and no gas use• Have digesters and have recently implemented/
are implementing CHPare implementing CHP• Are just curious…
