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Purpose

Energy costs are secondonly to raw material costs in

the operation of dry mill ethanol

plants. A large amount of thermal

energy as steam is used during

the process operations and

integrating energy efficiencies

by recovering more heat that

is available is vital to lowering

production costs.

Victory Energy is a leader in the design and manufacture of Heat Recovery Steam Generators (HRSG) for

ethanol plants. Steam is generated using energy from the hot ue gas exhaust from a Thermal Oxidizer. HRSG

and plant thermal efciencies are signicantly improved by incorporating economizers to recover the heat that

is still present in the HRSG exhaust. Challenging operating conditions have been responsible for reduced life

expectancies of some economizers.

Victory Energy has engineered a solution for this issue facing many HRSG owners by upgrading the metallurgy

of the economizer coils that are subjected to the corrosive environment in the ue gas path. This solution will

provide for long operational life and generate energy savings for many years.

Maximize Heat RecoveryEthanol plant HRSG economizers are designed to maximize heat recovery and are typically arranged in three

separate coils. Heat from the HRSG ue gas exhaust is used to rst heat de-aerated boiler feed-water; Secondly

the cook-water used in process operations is heated up in the cook-water economizer and nally the make-up feed-

water is heated in the third coil, prior to being de-aerated.

PRINCIPLE

10701 E. 126th St. N., Collinsville, Oklahoma 74021

918.274.0023

w w w . v i c t o r y e n e r g y . c o m

F O L L O W A L E A D E R

Victory Energy Economizers - Designed forthe long run.

Duplex

fnned

tube

coils

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Challenging Conditions

The make-up feed-water and cook-water are not de-aerated, i.e. they still contain dissolved oxygen. In addition the

temperature of the water entering these coils is typically below the water dew-point of the ue gas. Equally if not more

important is the fact that the ue gas has chlorides in it and in some cases even trace amounts of sulfur compounds.

All of these contribute to corrosion risks due to:

Oxygen pitting from the non de-aerated feed-water.

Corrosive condensation from the ue gas.

Chloride stress corrosion cracking.

Acid corrosion from condensing sulfur compounds.

Some ethanol plants have experienced corrosion issues with their economizers from one or more of these corrosion

mechanisms and are operating without economizers, leading to fuel dollars being wasted up the stack.

Victory Energy has the SolutionVictory Energy has selected Duplex Stainless Steel as the ideal metallurgy for the make-up feed-water and

cook-water coils. With its unique properties, Duplex pressure part construction can mitigate risks from all of these

corrosion mechanisms.

Victory Energy can provide replacement Duplex nned tube coils for quick eld installation. Our eld service

department can re-tube your existing economizer, usually within three days, during your next scheduled outage. In

some cases, entire shop assembled boxes or modules are available for quick and easy replacement.

As plants are trying to maximize production and operating above design conditions, Victory Energy Engineersare available to collect eld data and provide optimized alternative economizer designs to maximize heat recovery

and increase protability.

Let our experts provide you with the best engineered solution to maximize heat recovery. Contact us at

1.877.783.2665 to see how we can help you.

Contact us at 1.877.783.2665 to see how you can improve your Economizers performance.

PRINCIPLE

10701 E. 126th St. N., Collinsville, Oklahoma 74021

918.274.0023

w w w . v i c t o r y e n e r g y . c o m

F O L L O W A L E A D E R

Victory Energy

Engineers can

collect feld

data

and provide

optimized

economizer

designs.