DDI-HeatExchangers Inc.DDI-HeatExchangers Inc.

www.ddi-heatexchangers.comwww.ddi-heatexchangers.comDDI Since 1980DDI Since 1980

Poster

Sketch Anaerobic Digestion

Advantages

These 2 HX have been in These 2 HX have been in continuous non-stop operation continuous non-stop operation

for for 9 years9 years withoutwithout any any maintenancemaintenance

NapaneeNapanee

Pembroke

Comparison Flier

Payback is possible in 1 yearPayback is possible in 1 year

Energy Saved (15 Years)

Energy ROIEnergy ROI

Electricity CostElectricity Cost

Cogeneration

DDI HXDDI HX

DDI Outline

Tube Disadvantages –Heat Area

Tube Disadvantages - Length

Tube Disadvantages - Sludge

DDI Sketch w/ advantages

SPIRAL technology gets SPIRAL technology gets BLOCKED,BLOCKED, Max. gap is only 1” Max. gap is only 1” and has pins for other liquid (no and has pins for other liquid (no

% solids there).% solids there). - 1“- - 1“-

TUBE Technology cannot have TUBE Technology cannot have same flow for both liquids, and same flow for both liquids, and 3” gap each, at the same time.3” gap each, at the same time.

DrawingDrawing

Vitalix 65-70 % Solids Vitalix 65-70 % Solids MolassesMolasses

12 Sep 200712 Sep 2007• Vitalix Inc. has been using the DDI heat Vitalix Inc. has been using the DDI heat

exchanger almost a year now with very positive exchanger almost a year now with very positive results. results. Raw molasses at 65% to 70% solidsRaw molasses at 65% to 70% solids is is running on one side and hot water on the other. running on one side and hot water on the other. We have had no problems with plugging We have had no problems with plugging or pressure build upor pressure build up. We are also very . We are also very pleased with the pleased with the effectiveness of this unit effectiveness of this unit in heat transferin heat transfer. Thank you for your help and . Thank you for your help and support.support.

Plant Mgr.  Doug OlsonPlant Mgr.  Doug Olson 308-762-8358308-762-8358 Vitalix Inc.Vitalix Inc. Alliance NEAlliance NE. .

Pembroke Direct Sludge-to-Pembroke Direct Sludge-to-SludgeSludge

• From:From: David Atkinson David Atkinson Sent:Sent: September 7, 2007 11:23 AM September 7, 2007 11:23 AMTo:To: 'erwin@ddi.ca' 'erwin@ddi.ca'Subject:Subject: Letter of Reference Letter of Reference

•   • The Pembroke Pollution Control Centre is using the DDI Heat Exchanger with very The Pembroke Pollution Control Centre is using the DDI Heat Exchanger with very

positive results.  positive results.  Raw sludgeRaw sludge with an average temperature between 11* with an average temperature between 11*

C to 19* C flows through one side of the heat exchanger C to 19* C flows through one side of the heat exchanger and re-and re-circulated sludgecirculated sludge from the digesters with temperatures ranging in from the digesters with temperatures ranging in the high thirty’s flows through the opposite side of the heat exchanger.  This has the high thirty’s flows through the opposite side of the heat exchanger.  This has resulted in substantial savings as the resulted in substantial savings as the raw sludge is increased raw sludge is increased in temperature prior to entering the digesters in temperature prior to entering the digesters at no expense to the City sewage systemat no expense to the City sewage system..  After   After almost two years of operation no plugging has occurred and it works as per almost two years of operation no plugging has occurred and it works as per specification.  I am very satisfied with the results of this piece of equipment.  specification.  I am very satisfied with the results of this piece of equipment. 

•   • David AtkinsonDavid Atkinson• City of PembrokeCity of Pembroke• Utilities SuperintendentUtilities Superintendent• Office 613-735-6821 ext. 1490Office 613-735-6821 ext. 1490• Fax    613-732-7028 Fax    613-732-7028

Doors opened after 8.5 Doors opened after 8.5 yearsyears

The Gaskets after 8.5 YearsThe Gaskets after 8.5 Years

Inside – Clean and without Inside – Clean and without damage after 8.5 yearsdamage after 8.5 years

Viscosity Influence on required Viscosity Influence on required areaarea

RepresentativesRepresentatives

LinksLinks

•Personnel (http://www.ddi-heatexchangers.com/resume.htm)

•Other Products(http://www.ddi-heatexchangers.com/other_products.htm)

DDI can supply Parker Boiler & Pumps DDI can supply Parker Boiler & Pumps tootoo

DDI has PIG CLEANING optionDDI has PIG CLEANING option

Sample QuoteSample Quote

Tulsa OK, Via Ashbrook and Tulsa OK, Via Ashbrook and HDRHDR

Rialto- EnerTech via HDRRialto- EnerTech via HDR

11 Heat Exchangers- all phases.11 Heat Exchangers- all phases.

Molasses with 65 % Molasses with 65 % SolidsSolids VitalixVitalix

DDI HX and Boiler setDDI HX and Boiler set DDI in Pontiac with Boiler combined- DDI in Pontiac with Boiler combined- (Cover removed)(Cover removed)

Building’s Sewage Heat Building’s Sewage Heat RecoveryRecovery

RECOVERING HEATRECOVERING HEAT from the Hot from the Hot liquids leaving the Suites (i.e. liquids leaving the Suites (i.e. SewageSewage with % Solidswith % Solids) at about ) at about 20-28 deg C. 20-28 deg C.

Directly to… Directly to…

Cold WaterCold Water entering the Building entering the Building before the Boiler, at about 2-10 before the Boiler, at about 2-10 deg C.deg C.

Man-Hole Man-Hole (video on the web)(video on the web)

Davit Arm – swings door in limited Davit Arm – swings door in limited spacespace

DDI Logo - Final