Hurricane Katrina: Baptist Medical Center's CHP Plant Operation

1
Hurricane Katrina Baptist Medical Center's CHP
Plant Operation

• Louay Chamra, PhD
• and
• B. K. Hodge, PhD, PE
• Southeast CHP Application Center
• Mississippi State University

2
Facility Overview
3
Facility Overview

• 624-bed capacity
• Full-service urban hospital with a medical staff
  of 497 with 3,000 employees

4
System Description

• System Schematic

Econ.
WHRB
Natural Gas
DV
Generator
Gearbox
Turbine
Chiller
5
System Description
6
System Description

• Gas Turbine Generator Set
• Diverter Valve
• Waste Heat Recovery Boiler
• Economizer
• Steam Absorption Chiller
• Primary Switch Gear

7
System Description

• Gas Turbine Generator Set

8
System Description

• Gas Turbine Generator
• Natural gas fired
• 5,600 hp with ISO standard day output of 4.0 MW
• Starting and synchronizing controls
• Fire detection/protection
• Vibration analyzer
• Nominal 13,800 volts

9
System Description

• Diverter Valve
• Operation is controlled by the heat recovery
  boiler
• Directs the exhaust gas to the HR boiler or out
  of the bypass stack to maintain the required
  steam pressure

10
System Description

• Waste Heat Recovery Boiler
• WHRB rated at 30,000 lb/hr
• 125 psi steam to absorption units and hospital
• Two modes of firing
• Turbine
• 5.8 MMBtu duct burner system
• supplements turbine exhaust
• Direct fresh-air fire
• 41.5 MMBtu when the turbine is off line

11
System Description

• Economizer
• Utilizes remaining waste heat to preheat boiler
  feed water
• Water treatment chemicals fed to feedwater prior
  to the economizer

12
System Description

• Absorption Chillers
• 1250-ton double effect
• Utilizes 115 psi steam at 11.8 lb/hr-ton
• 750-ton double effect
• Utilizes 115 psi steam at 9.6 lb/hr-ton
• Chilled water at 42 F with 54 F return
• 23 AHUs served in main hospital
• 60 percent of total chilled water requirements

13
System Description

• Absorption Chillers

14
System Description

• Primary Switchgear
• Metal-clad 4-bay switchgear
• Vacuum breakers for generator output and primary
  utility feed
• Generator and utility protective relays
• Synchronizing controls for generator/utility grid
• Immediate shift from turbine to grid power
• 2 seconds to secondary grid feed

15
Scheduled Maintenance Items and Frequency

• Turbine gearbox overhaul 3.5 years
• Oil change As needed
• Filter replacement 3 months
• Routine inspections 8 weeks
• Intermediate inspection 6 months
• Annual inspection
• 200 off-line hours/year for inspections
• Monthly maintenance contract 14,500
• (includes all parts and labor)

16




Economics (early years)

• Year Elec. Sav. NG Cost Maint.
  Savings
• 1,250,000 402,000 159,000
  686,000
• 1,240,000 432,000 159,000
  648,000
• 1,400,000 468,000 163,000
  770,000
• ___________
• Average cost avoidance 701,000
• Projected simple payback period attained.

17
Economics (recent)

• Year Elec. Sav. NG Cost Maint.
  Savings
• 2001 1,415,770 708,549 174,000
  533,225
• 2002 1,587,074 776,950 174,000
  636,123
• 1,823,494 743,852 174,000
  905,643
• 2,022,926 972,401 174,000
  876,524
• ___________
• Average cost avoidance 737,879

18
Utilities

• Natural gas price per MMBTU Pre-Katrina -
  8.46 Post-Katrina - 14.79
• Electricity price per kWh Pre-Katrina -
  0.08 Post-Katrina - 0.07

19
Utilities Cost Data
20
Hurricane Katrina
21
Katrinas Impact

• 302,000 homes destroyed
• Approximately 125-250B in damages
• 1,323 deaths
• 2.7M customers without power

22
MBMC Response
23
Value of CHP

• Mississippi Baptist Medical Center
• Remained open and treated a high volume of
  patients
• Provided clothing, food, and housing for
  displaced patients during the first night of the
  disaster
• Opened a round-the-clock day care to allow
  employees to focus on patient care

24
Any Questions?

• Energy Efficient with a Cleaner Environment
• Power Security
• Power Reliability

CHP is a Triple Win