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Four examples of typical combustion source types, and the results with a Cain Industries heat recovery system applied. DATA without a Cain System Combustion Source: Hot Water Boiler Heat Sink ........................ Return Water Waste Exhaust Temp .................. 510°F Water Temp. Inlet ...................... 130°F Btu/hr Burner Input ............. 6,437,000 Fuel Type ......................... Natural Gas O2 Content .................................. 10% Excess Air ................................... 82% Combustion Efficiency ................... 75% Fuel Cost Per Therm ..................... $.60 Annual Operating Hours ............ 6,000 PERFORMANCE with a Cain System Model Selection ........................... C700 Circulating Water Flow .............. 20 gpm Final Exhaust Temp. ...................... 250°F Water Temp. Outlet ...................... 186°F Pressure Drop, Water ............... 5.0 psig Pressure Drop, Exhaust ........... 0.10” WC Btu/hr recovered .................... 560,900 Btu/hr saved ........................... 747,900 Total Cost Installed ....................$12,400 Payback ........................... 5.5 mo. Annual Return on Investment 217% Annual Savings ............... $26,880 DATA without a Cain System Combustion Source: 800 BHP Steam Boiler Heat Sink .................. Boiler Feed Water Waste Exhaust Temp. .................. 470°F Water Temp. Inlet ........................ 210°F Btu/hr Burner Input ............ 33,580,000 Fuel Type ........................... Natural Gas O2 Content ..................................... 6% Excess Air ..................................... 36% Combustion Efficiency ................. 78.9% Fuel Cost Per Therm ...................... $.60 Annual Operating Hours ............. 6,000 PERFORMANCE with a Cain System Model Selection ............ RTR-142H26ALS Boiler Feed Water Flow ........... 55.2 gpm Final Exhaust Temp. ...................... 319°F Water Temp. Outlet ................... 263.3°F Pressure Drop, Water ................ 2.0 psig Pressure Drop, Exhaust ........... 0.47” WC Btu/hr recovered .................. 1,417,000 Btu/hr saved ........................ 1,776,000 Total Cost Installed ................... $37,700 Payback ........................... 7.1 mo. Annual Return on Investment 170% Annual Savings .............. $ 63,936 DATA without a Cain System Combustion Source: 1,250 kW Engine Heat Sink ............. 50% Ethylene Glycol Waste Exhaust Temp. ................. 968°F Water Temp. Inlet ....................... 195°F SCFM ....................................... 3,667 Fuel Type ......................... Natural Gas O2 Content ................................. N/A Excess Air .................................. N/A Combustion Efficiency (relative) ..... 78% Fuel Cost Per Therm ..................... $.60 Annual Operating Hours ............ 6,000 PERFORMANCE with a Cain System Model Selection ..........HRSR-336B28CSS Circulating Liquid Flow ............ 175 gpm Final Exhaust Temp. ......................330°F Water Temp. Outlet ...................... 232°F Pressure Drop, Water ............... 8.3 psig Pressure Drop, Exhaust ........... 1.75” WC Btu/hr recovered .................. 2,863,000 Btu/hr saved ........................ 3,670,000 Total Cost Installed ................. $ 57,960 Payback ........................... 5.3 mo. Annual Return on Investment 228% Annual Savings ............ $ 132,120 DATA without a Cain System Combustion Source: 1,700 kW Engine Heat Sink ....................... Process Steam Water Exhaust Temp. .................. 783°F Water Temp. Inlet ......................... N/A SCFM ....................................... 5,222 Fuel Type .......................... Natural Gas O2 Content ................................... N/A Excess Air ................................... N/A Combustion Efficiency (relative) ...... 78% Fuel Cost Per Therm ..................... $.60 Annual Operating Hours ............ 6,000 PERFORMANCE with a Cain System Model Selection ........ ESG1-620D18CSS Operating Steam Pressure ........150 PSIG Final Exhaust Temp ...................... 428°F Boiler Horsepower ..................... 68 BHP Equivalent Evaporation .......... 2,339 pph Pressure Drop, Exhaust .......... 1.55” WC Btu/hr recovered .................. 2,269,000 Btu/hr saved ........................ 2,908,000 Total Cost Installed ................. $113,600 Payback ......................... 13.0 mo. Annual Return on Investment 92% Annual Savings ............. $104,688 Savings comparison data is based on a conservative fuel cost per therm (100,000 Btu), and approximate annual operating hours. Your results may vary. Total Cost Installed includes: Equipment, shipping, and complete installation. Contact Cain Industries for your FREE savings analysis proposal. Your Authorized Cain Representative PO Box 189 W194 N11826 McCormick Dr. Germantown, WI 53022 262-251-0051 800-558-8690 sales@cainind.com www.cainind.com © 2000, Cain Industries. All rights reserved. Printed in USA #90180PDF Image | Powerhouse Exhaust Gas Waste Heat to Energy Project
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