Research Papers: Gas Turbines: Microturbines and Small Turbomachinery

Modeling and Simulation of an Externally Fired Micro-Gas Turbine for Standalone Polygeneration Application

[+] Author and Article Information
Moksadur Rahman

Department of Energy Technology,
KTH Royal Institute of Technology,
Stockholm 114 28, Sweden
e-mail: musa_me4@yahoo.com

Anders Malmquist

Department of Energy Technology,
KTH Royal Institute of Technology,
Stockholm 114 28, Sweden
e-mail: anders.malmquist@energy.kth.se

Contributed by the Power Division of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received July 31, 2015; final manuscript received March 23, 2016; published online May 24, 2016. Assoc. Editor: Rakesh K. Bhargava.

J. Eng. Gas Turbines Power 138(11), 112301 (May 24, 2016) (15 pages) Paper No: GTP-15-1384; doi: 10.1115/1.4033510 History: Received July 31, 2015; Revised March 23, 2016

Small-scale distributed generation systems are expected to play a vital role in future energy supplies. Subsequently, power generation using micro-gas turbine (MGT) is getting more and more attention. In particular, externally fired micro-gas turbine (EFMGT) is preferred among small-scale distributed generators, mainly due to high fuel flexibility, high overall efficiency, environmental benefits, and low maintenance requirement. The goal of this work is to evaluate the performance of an EFMGT-based standalone polygeneration system with the help of computational simulation studies. The main focus of this work is to develop a dynamic model for an EFMGT. The dynamic model is accomplished by merging a thermodynamic model with a mechanical model of the rotor and a transfer function based control system model. The developed model is suitable for analyzing system performance particularly from thermodynamic and control point of view. Simple models for other components of the polygeneration systems, electrical and thermal loads, membrane distillation unit, and electrical and thermal storage, are also developed and integrated with the EFMGT model. The modeling of the entire polygeneration system is implemented and simulated in matlab/simulink environment. Available operating data from test runs of both the laboratory setups are used in this work for further analysis and validation of the developed model.

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Fig. 1

Block diagram of the proposed polygeneration system

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Fig. 2

Externally fired microturbine CHP system

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Fig. 3

T–S diagram of externally fired gas turbine cycle

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Fig. 4

Compower ET10: (a) laboratory scale prototype and (b) conceptual layout (source: Compower AB)

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Fig. 5

(a) Conceptual diagram of an AGMD and (b) semicommercial AGMD unit of SCARAB Development AB [21]

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Fig. 6

Battery power required during startup

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Fig. 7

Battery supply during peak load

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Fig. 8

Electric power and rotor speed during test run

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Fig. 9

Turbine, compressor, and electric power during the test run

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Fig. 10

Fuel flow rate and booster fan speed during the test

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Fig. 11

Pressure ratio against the rotor speed

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Fig. 12

Pressure drop in the recuperator with respect to the rotor speed

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Fig. 13

Air temperature at different points of air cycle

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Fig. 14

Gas temperature at points of the gas cycle

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Fig. 15

Water temperature at boiler inlet and outlet during test run

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Fig. 16

Developed model for an EFMGT

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Fig. 21

Block diagram of the temperature controller

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Fig. 20

Block diagram of the temperature measurement

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Fig. 19

Block diagram of microturbine fuel supply system

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Fig. 18

Block diagram of microturbine speed governor

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Fig. 17

Block diagram of the fuel supply and control system

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Fig. 26

Generator speed (simulated)

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Fig. 27

Turbine, compressor, generator, and thermal power (simulated)

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Fig. 28

Turbine and compressor pressure ratio (simulated)

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Fig. 29

Working fluid (air) temperature at different stages of the cycle (simulated)

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Fig. 22

Block diagram of the thermal storage

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Fig. 23

Balance between demonstrative electrical load and supply

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Fig. 24

Demonstrative space heating demand

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Fig. 25

Demonstrative hot water/ service water demand

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Fig. 31

Flow rates to/from the combustor (simulated)

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Fig. 32

Water temperature at the boiler inlet and outlet (simulated)

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Fig. 33

MD pure water production rate and feed temperatures (simulated)

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Fig. 30

Combustion gas temperature at different stages of the cycle (simulated)

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Fig. 34

Hourly electricity load profile of a Swedish family house (all household, average over whole year) [35]

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Fig. 35

Hourly heating load profile of a Swedish family house (all household, average over whole year) [35]

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Fig. 36

MD pure water production rate (simulated)

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Fig. 37

Thermal storage temperature (simulated)

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Fig. 38

Turbine, compressor, generator, and thermal power (simulated)



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