CU POWERHOUSE OPTIMIZATION

PAUL C. CALDARA, P.E.

Engineer, Energy Section Colorado Department of Regulatory Agencies Public Utilities Commission 1560 Broadway, Suite 250 Denver, CO 80202

PRESENTER’S BACKGROUND

• PROFESSIONAL ENGINEER ON STAFF, COLORADO PUC, 2008 TO PRESENT

• MANAGER, UTILITY SERVICES, UNIVERSITY OF COLORADO AT BOULDER, 2000 – 2008

• ENGINEER, MARKETING, XCEL ENERGY, 1990 – 2000

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BY THE WAY….

• ONLY THE COMMISSION SPEAKS FOR THE COMMISSION. STAFF CAN PROVIDE STAFF’S OPINION.

• THE DRAWINGS AND INFORMATION IN THE PRESENTATION ARE FOR ILLUSTRATIVE PURPOSES AND MAY NOT BE PRECISELY ACCURATE.

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WHAT YOU NEED TO KNOW:

•PRIORITIES:

1) SAFETY

2) RELIABILITY

3) ECONOMICS

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CAMPUS LOAD

• ELECTRICITY: 20mW, 120,000,000 kWh annually.

• STEAM: 150,000 lbs/hr winter steam load.

• CHILLED WATER: 3,300 tons, peaks in summer.

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PURPA

• PUBLIC UTILITIES REGULATORY POLICY ACT,1978.

• ENCOURAGED THE DEVELOPMENT OF COGENERATION FACILITIES, AND PROVIDES THAT UTILITIES WOULD BE REQUIRED TO PURCHASE ELECTRICITY FROM, AND PROVIDE BACK-UP POWER TO CO-GENERATORS AT NON-DISCRIMINATORY RATES.

• CO-GENERATORS ARE EXEMPT FROM REGULATION AS PUBLIC UTILITIES.

• ELECTRIC UTILITIES ARE REQUIRED TO INTERCONNECT AND OPERATE IN PARALLEL WITH COGENERATION FACILITIES.

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CO-GENERATION

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CAMPUS LOAD: ELECTRICITY, STEAM, CHILLED WATER

CO-GENERATION

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CO-GENERATION

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CO-GENERATION

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CO-GENERATION

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CO-GENERATION

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CO-GENERATION

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EQUIPMENT

• TWO BOILERS: 130,000 lbs/hr AND 100,000 lbs/hr

• TWO 16 mW GAS COMBUSTION TURBINES

• TWO 80,000 lbs/hr HEAT RECOVERY STEAM GENERATORS

• 1 mW STEAM TURBINE

• THREE ABSORPTION CHILLERS

• THREE UTILITY FEEDERS

• ELECTRIC SWITCHGEAR

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CIRCA 1910

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CIRCA 1920-1930

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CIRCA 1960

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PRESENT DAY

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SWITCHGEAR VAULT

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13 kV SWITCHGEAR

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13 kV SWITCHGEAR

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13 kV SWITCHGEAR

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MONITORING “THE BOARDS”

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POWERHOUSE SWITCHGEAR PANEL

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SYNCHROSCOPE

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TURBINE CONTROLS

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ABSORPTION CHILLER

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ABSORPTION CHILLER

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COMBUSTION GAS TURBINE

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OUTSIDE OF TURBINE

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TURBINE EXHAUST STACKS

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COMBUSTION GAS TURBINE

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GENERATOR END OF TURBINE

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STEAM BOILER

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STEAM BOILER, NATURAL GAS FLAME

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STEAM BOILER, LOOKING UP

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HRSG, LOOKING UP

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PUMPS EVERYWHERE

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• CO-GENERATION CAN INCREASE EFFICIENCY

BUT CAN ADD COMPLEXITY.

• THE SIZING OF EQUIPMENT IS IMPORTANT

BECAUSE YOU LIVE WITH YOUR DECISIONS FOR

A LONG TIME.

• THE MORE OPTIONS YOU HAVE TO SERVE LOAD,

THE MORE COMPLEX TO FIND TRUE

OPTIMIZATION.

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• ALWAYS THINK BROADLY WHEN THINKING OF ENERGY AND ENERGY EFFICIENCY.

• LOOK FOR UNINTENDED CONSEQUENCES.

• REMEMBER YOUR PRIORITIES OF SAFETY, RELIABILITY, AND THEN ECONOMICS/EFFICIENCY.

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THANK YOU

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