Combined Heat & Power (CHP)

Group Meeting #1January 29th, 2013

Michael BentelJeremy DavidErik Peterson

Arpit Shah

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OverviewAll energy will be processed through the CHP plantComponents of the CHP Plant

Gas and Steam Turbine Generation of ElectricityBoiler Production of various pressure steam (LP,MP,HP)

Natural gas from Gas Treating Plant and purge gases from Fischer Tropsch Liquids Refining Plant will be burned.

Plant water from *Team India* will be upgraded to the purity required for boiler feed water and steam turbine

CHP will provide plant and instrument air along with cooling water

All the electrical requirements will be met along with providing 50 MW electricity to the grid

Make up water will be taken from area wells, demineralized and filtered as required

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Group Meeting #1 ObjectivesReport Outlines EstablishedConceptual Process Block FlowDesign BasisCompeting ProcessesGroup Meeting #2 Objectives

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Outline 1. Design Basis √2. Block Flow Diagram √3. Process Flow Diagram4. Material and Energy Balance IN PROGRESS5. Calculations6. Annotated Equipment List (Data Sheet)7. Economic Evaluation factored from Equipment Costs8. Utilities9. Conceptual Control Scheme10. General Arrangement – Major Equipment Layout11. Distribution and End-use Issues Review12. Constraints Review13. Applicable Standards14. Project Communications File IN PROGRESS15. Information Sources and References IN PROGRESS

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Block Flow Diagram (BFD)

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Proposed BFD

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Evaporative Cooling Tower

Processes

Hot Return Water

Cold Supply Water Compressor

Dryer

Air

Compressed Air

Plant Air

Instrument Air

Water Purification

Processes

Boiler

Gas Turbine

Processes

Steam Turbine

Processes

Plant Water Superheated Steam

Natural Gas

Electricity

Hot Gases

BFW

LegendBFW = Boiler Feed WaterMP = Medium PressureLP = Low Pressure

Recycled Condensate

MP steam

LP steam

Condensate

Electricity

Condensate

BFW

Condensate

Condensate Drum

Natural Gas

Air

Effluent

ComponentsTurbinesBoilersPumpsCompressorsEvaporative Cooling TowerWater Purification

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TurbinesTwo Turbine Types

Steam TurbineGas Turbine (i.e. Engine Turbine)

Majority of Electrical Production from Gas Turbine

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Turbine - Recycle Hot gas from Engine Turbine will be used to

heat the boiler Exhaust steam from Steam Turbine will be

used as a mid & low pressure steam sourceRemaining steam will be condensed and fed

back to the boiler feed water

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Boiler TypesWater - Tube BoilerFire - Tube BoilerFluidized Bed Combustion (FBC)

Atmospheric Fluidized Bed Combustion BoilerPressurized Fluidized Bed Combustion BoilerAtmospheric Circulating Fluidized Combustion Boiler

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Water-Tube BoilerModern boiler tube designs within 10,000-

265,000 lbs/hour capacityProduces high pressure steamUtilization of forced and induced drafts for

improved combustion efficiency Higher thermal efficiency shifts are possible

(~90%)Less tolerance for water quality calls for

water treatment plant to avoid scaling

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Boiler ConfigurationWater tube boilers are generally preferred in

high pressure/high steam applications High pressure steam is contained within

small diameter pipes which can withstand the pressure with a thinner wall

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Pumps/CompressorsIndustrial grade pump necessary to circulate

boiler feed water and condensate throughout the plant

Compressed air load is necessary in order to design air system

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Evaporative Cooling Tower (ECT)Provide low cost cooling

below the dry bulb ambient temperature

One of the most energy efficient methods of cooling

Evaporative Cooling Towers allow a small portion of the water being cooled to evaporate into a moving air stream which will provide significant cooling to the rest of that water stream.

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Water PurificationType of purification process is dependent on

types of impurities present in plant waterBoiler operation is completely dependent on

the purity of incoming waterPlant water must be cooled to meet the

requirements of the purification system

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Types of Purification ProcessesFiltrationEvaporationMembrane

Filtration + Electrodionisation Ultrapure Water

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Required InformationEnergy LoadSteam Load/Supply PressureCompressed Air LoadRecyclable Products (if applicable)Specific Team Requirements

Plant Water Composition (Team India)Natural Gas Production & Composition (Team

Alpha)Purge Gas and Steam Quantities (Team

Foxtrot)17

Future ObjectivesMake final decisions on system componentsFinalize CHP BFDProbe other units for desired load

requirements and waste product generation

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Questions

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