Consulting-Specifying Engineer - August 2007 - (Page A4)

For More Information Cleaver-Brooks www.cleaver-brooks.com E N E RGY SOLUTION S CE NTE R Combustion & Energy Systems Ltd www.combustionandenergy.com DOE/EERE Programs www.eere.energy.gov/industry/saveenergynow Madden Manufacturing www.maddenmfg.com Menex Inc. Tel (905) 276-1774 Email: menex.jozo@bellnet.ca More About Boilers www.energysolutionscenter.org/tech/tech_boilers.asp Penn Separator www.pennseparator.com Sentry Equipment Corp. www.sentry-equip.com Sidel Systems USA www.sidelsystems.com Spirax Sarco www.spiraxsarco.com ConDex condensing economizer system is situated on the steel platform in the center of this photo. each other, so the circulating water remains unchanged. For this reason, this process also can be used with dual-fuel boilers that burn both oil and gas, as well as with gas-only boilers. He also points out that because this type heat recovery allows less fuel to be burned, emissions of CO2, a greenhouse gas, are reduced. For each million Btu of fuel saved, the emission of CO2 is reduced by 118 lbs. CIRCULATING WATER NOT CONTAMINATED Veitch explains that the condensing economizer approach has an advantage over spray tower systems because it heats water to higher temperatures, not being limited by the dew point of the ﬂue gas. Additionally, he says, there is no requirement for continuing treatment of the circulating water. An example of an installed ConDex system is at a Dow Corning plant in Carrollton, Ky. Here the system heats process and makeup water from 55°F to 180°F and recovers an average of 6.3 million Btu per hour, for annual energy savings of $628,000. The installed payback for this system was achieved in one year. In an installation on the district heating system of the University of Guelph in Ontario, a ConDex system is used to recover ﬂue gases from multiple boilers, heating treated boiler makeup water from 65°F to 200°F. The University calculates that the system generates annual energy cost savings of $535,000. Del Monte Corp. installed ConDex condensing economizers on boilers at two seasonal food processing factories in Rochelle, Ill., in December 2005. According to Del Monte spokesman Bill Riker, the results were obvious and immediate. He indicates, “Based on the successes during that ﬁrst year, we have just completed the startup of ConDex systems at two other seasonal facilities, and have begun evaluating the potential for a ﬁfth facility. The sixth and seventh facilities have already been identiﬁed.” Riker notes that during the summer and fall processing seasons of 2006, natural gas consumption was reduced by 9.3%. He adds, “The average exit gas temperature was only 101.5°F.” Riker also points out that the greater the ﬂow of makeup water, the greater the heat recovery will be. He also says that the greater the boiler’s annual utilization factor, the greater will be the rate of return. “This is an important consideration, but we were able to justify projects for seasonal factories that operated only three months per year,” Riker says. SIDEL SYSTEM FEATURES SMALL FOOTPRINT Another important provider of ﬂue gas heat recovery equipment is Sidel Systems U.S.A. Inc. The Sidel SRU ﬂue gas condenser features a vertical design with a relatively small footprint. Standard systems are available in sizes from 2.1 to 42 million Btu/hour. The design uses stainless steel water tubes with a pure aluminum ﬁnned-tube heat exchange surface. The system is arranged with the greatest level of condensation toward the upper level of the unit, so condensate trickling down helps keep the ﬁnned-tube surfaces clean. According to Sid Abma from Sidel, “With enough water ﬂow through the SRE condenser block, the ﬂue gas temperature will be reduced to almost the same temperature as the incoming water. This is the reason we want the coolest water possible.” He suggests using the unit for pre-warming building hot water, boiler make-up water, even water for swimming pools or greenhouse use. THE COLDER THE BETTER Abma indicates, “We want the coldest water, and as much as we can have.” He notes that radiant ﬂoor heating is another great use for this water. “Tens Continued on Page A12 A4 http://www.cleaver-brooks.com http://www.combustionandenergy.com http://www.eere.energy.gov/industry/saveenergynow http://www.maddenmfg.com http://www.energysolutionscenter.org/tech/tech_boilers.asp http://www.pennseparator.com http://www.sentry-equip.com http://www.sidelsystems.com http://www.spiraxsarco.com

Table of Contents Feed for the Digital Edition of Consulting-Specifying Engineer - August 2007

Contents M/E Roundtable Giants 100 Pullout Poster Giants Stand Tall: CSE Giants 100 Report Electrical Design for Tall Buildings HVAC and Fire Safety for Elevator Systems How to Beat the Codes GAS Technology Supplement Recovering Waste Heat from Boilers New Applications for Tankless Water Heating Systmes Techniques Improve for Powder Coating MDF New Tools Available for Heat Treating Steel Direct Drive Engines

Consulting-Specifying Engineer - August 2007

For optimal viewing of this digital publication, please enable JavaScript and then refresh the page. If you would like to try to load the digital publication without using Flash Player detection, please click here.