.1.1Proprietary and Confidential © 2014 Babcock & Wilcox Power Generation Group, Inc. All rights reserved.

The Babcock & Wilcox Company FastCirc™ HRSG

June 12, 2014

.2.2Proprietary and Confidential © 2014 Babcock & Wilcox Power Generation Group, Inc. All rights reserved.

HRSG Side Viewwith FastCirc™ Vertical Separator

Single row harps

FastCirc™ Vertical Separator

Optimized SH and RH drains

.3.3Proprietary and Confidential © 2014 Babcock & Wilcox Power Generation Group, Inc. All rights reserved.

FastCirc HRSG Arrangement

• Reduced crane requirements during construction• Increased personnel safety in operation• Performs the same function of an HP Steam Drum• Reduces shell and connection stresses during fast start and rapid load changes

.4.4Proprietary and Confidential © 2014 Babcock & Wilcox Power Generation Group, Inc. All rights reserved.

• Thick Walls (~6”-7” for a 2400 PSI Unit) – Limits startup time / HP drum life

• Drum hump during startup and transients

Drawbacks of Conventional HP Drum

.5.5Proprietary and Confidential © 2014 Babcock & Wilcox Power Generation Group, Inc. All rights reserved.

Patented FastCirc™ Vertical Separator

Vertical Separator Benefits:• Performs the same function as an HP

steam drum• Thin Walls• Increased Response to Load Changes• Eliminates Drum Hump Problems• Expands in the vertical direction

(same as tube bundles)

.6.6Proprietary and Confidential © 2014 Babcock & Wilcox Power Generation Group, Inc. All rights reserved.

Vertical Separator Benefits:• Thin walls (~3” for 2400 PSI

Units)• Expands in the vertical direction

(same as tube bundles)• Integral internals• Same steam purity and holding

capacity as conventional drum

Patented FastCirc™ Vertical Separator

.7.7Proprietary and Confidential © 2014 Babcock & Wilcox Power Generation Group, Inc. All rights reserved.

• Hot start ≤ 8 hours

• Warm start > 8 hours and ≤ 72 hours

• Cold start > 72 hours

Typical Gas Turbine Ramp Rate for Hot Startup

Flow %Press. Psig, Temp °F

Time (minutes)

HRSG Startup Transient ConditionsStart Type Cold Warm HotTime to MCR Minutes 100 96 27Drum Press., psig 2430 2430 2430  Temp., F 665 665 665SSH Out Press., psig 2400 2400 2400  Temp., F 1050 1050 1050Lifetime Cycles (30 years) 200 1170 4680

Cycles Vertical Separator HP Drum Design CyclesCold 1% 10% 200Warm 6% 32% 1170Hot 18% 140% 4680

Total 25% 182% 6050

Fatigue Life UsageFastCirc Vertical Separator vs. HP Steam Drum

.8.8Proprietary and Confidential © 2014 Babcock & Wilcox Power Generation Group, Inc. All rights reserved.

Thank You!