Embed Size (px)
Citation preview
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…
