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MICROTURBINE

PRESENTED BY-RAHUL KUMAR PRASADMECHANICAL, ME-1, GRP-1REDG. NO. : 1201219418

3Introduction Micro Turbines are new type of

combustion turbine used for energy generation.

They provide not only electricity , but also the thermal energy for heating needs.

they typically have power outputs in the range of 25 to 300kW.

4 Need of Micro turbines

Demand of alternate energy sources Need of energy in Remote locations Need of compact & portable power generator better efficiency and require infrequent

maintenance. Need of clean energy generating device

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Micro Turbine producing power, as well as heat

6Components of Microturbine

CompressorCombustorGeneratorRecuperator (Heat Exchanger)Turbine Power Electronics (Rectifier & Inverter)

7Combined Heat & Power (CHP) Diagram

8Working Principle Micro turbines are small gas turbines, most of which feature an

internal heat exchanger called a recuperator. In a micro turbine, a radial flow (centrifugal) compressor

compresses the inlet air that is then preheated in the recuperator using heat from the turbine exhaust.

Next, the heated air from the recuperator mixes with fuel in the combustor and hot combustion gas expands through the expansion and power turbines. The expansion turbine turns the compressor and, in single-shaft models, turns the generator as well.

Finally, the recuperator uses the exhaust of the power turbine to preheat the air from the compressor.

Single-shaft models generally operate at speeds over 60,000 revolutions per minute (rpm) and the permanent magnet generator generates electrical power of high frequency, and of variable frequency (alternating current --AC). This power is rectified to direct current (DC) and then inverted to 50/60 Hz for commercial use.

9Types of MicroturbineUnrecuperated Microturbine

Recuperated Microturbine

10ComparisonUnrecuperated

Compressed air is mixed with fuel and burned under constant pressure conditions.

Efficiency 15%.

Recuperated A sheet metal heat

exchanger (recuperator) recovers temperature of the air stream supplied to the combustor.

Efficiency 20~30%.

11Micro turbine Overview Commercially Available Yes (Limited)

Size Range 25-500 kW

Fuel Natural gas, hydrogen, propane, diesel

Efficiency 20-30% (Recuperated)

Environmental Low (<9-50 ppm) Nox

Other Features Cogeneration (50-80°C water)

Commercial Status Small volume production, commercial prototypes now.

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12Advantages of Microturbine

Small number of moving parts Compact size Lightweight Good efficiency in cogeneration Low emission Long maintenance interval less vibration Less noise than reciprocating engines

13Application of Microturbine

Cogeneration Small scale power generation

In Automobiles (turbocharger)

Auxiliary power unit for air planes

14Microturbine Manufacturers

Bowman power systemsCapstone Turbine CooperationElliott energy systemsTurbec AB Ingersoll-Rand Company

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