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Research Papers: Gas Turbines: Industrial & Cogeneration

Application of a Computational Code to Simulate Interstage Injection Effects on GE Frame 7EA Gas Turbine

[+] Author and Article Information
M. Bagnoli, M. Bianchi, F. Melino, A. Peretto

 DIEM University of Bologna, Viale Risorgimento, 2-40136 Bologna, Italy

P. R. Spina

ENDIF, University of Ferrara, Via Saragat, 44100 Ferrara, Italy

S. Ingistov

WCC/BP

R. K. Bhargava

 Foster Wheeler USA Corp., 2020 Dairy Ashford Road, Houston, TX 77077

J. Eng. Gas Turbines Power 130(1), 012001 (Dec 17, 2007) (10 pages) doi:10.1115/1.2771247 History: Received June 28, 2006; Revised October 17, 2006; Published December 17, 2007

This paper investigates effects of interstage water injection on the performance of a GE Frame 7EA gas turbine using aerothermodynamic modeling. To accomplish this objective, a computational code, written in FORTRAN 90 language and developed by DIEM University of Bologna, has been used. The calculation procedure considers effects of evaporation of injected water within the compressor including droplets dynamics, which are necessary in order to fully evaluate effects of wet compression on the gas turbine performance. The robustness of the computational code is demonstrated by evaluating stage-by-stage compressor performance and the overall gas turbine performance in the presence of inlet evaporative fogging, overspray fogging, and interstage water injection. The presented results show that water injection location influences compressor stage loading redistribution differently. The plausible explanations to the observed trends of various performance parameters are presented in this paper.

Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Normalized flow coefficient change at the stage inlet as calculated by White and Meacock (7) (red dotted lines) and by the developed calculation code (18) (blue continuous lines) versus stage number and water to air ratio: 1% (a), 2% (b), and 5% (c) Reference: 15°C, 1.013bars, 100% of RH, droplets diameter equal to 5μm

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Figure 2

GE Fr7EA simulation model

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Figure 3

Generalized compressor stage characteristics ψp*=Fψ(ϕ*,SF)

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Figure 4

Generalized compressor stage efficiency curve

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Figure 5

Frame 7EA power output evaluated by GTPRO (continuous lines) and by the code (square markers) as function of ambient temperature and load

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Figure 6

Frame 7EA Heat Rate evaluated by GTPRO (continuous lines) and by the code (square markers) as function of ambient temperature and load

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Figure 7

Frame 7EA air mass flow rate evaluated by GTPRO (continuous lines) and by the code (square markers) as function of ambient temperature and load

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Figure 8

Gas turbine power output change as function of injected water and air mass flow rate ratio and injection point

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Figure 9

Gas turbine heat rate change as function of injected water and air mass flow rate ratio and injection point

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Figure 10

Compressor pressure ratio as function of injected water and air mass flow rate ratio and injection point

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Figure 11

Air mass flow rate at compressor inlet as function of injected water and air mass flow rate ratio and injection point

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Figure 12

Compressor specific work change as function of injected water and air mass flow rate ratio and injection point

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Figure 13

(a) First stage performance maps and operating points with water injection (Reference: ISO case). (b) 17th stage performance maps and operating points with water injection (Reference: ISO case). (c) First stage performance maps and operating points with water injection (Reference: HOT case). (d) 17th stage performance maps and operating points with water injection (Reference: HOT case).

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Figure 14

(a) Normalized flow coefficient trend at the inlet of each stage as function of injection point and water amount (ISO case). (b) Normalized stage pressure ratio as function of injection point and water amount (ISO case).

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Figure 15

(a) Normalized flow coefficient trend at the inlet of each stage as function of injection point and water amount (HOT case). (b) Normalized stage pressure ratio as function of injection point and water amount (HOT case).

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Figure 16

Temperature profile across the compressor, with reference to 40°C of air temperature and 40% of relative humidity, in case of no water injection and with 6.8kg∕s of water injected upstream of third stage (WIP3)

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Figure 17

Pressure profile across the compressor, with reference to 40°C of air temperature and 40% of relative humidity, in case of no water injection and with 6.8kg∕s of water injected upstream of third stage (WIP3)

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Figure 18

Evaporated water to injected water ratio across the compressor, with reference to 40°C of air temperature and 40% of relative humidity, in the case of 6.8kg∕s of water injected upstream of third stage (WIP3)

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