Abstract

This paper deals with aspects of the combined power and power (CPP) plants. Such plants consist of two major parts: the steam turbine and gas turbine plants. This study investigates the efficiency of CPP under the effect of several factors. CPP plants including an open cycle gas turbine and a bottoming cycle steam turbine can achieve the highest thermal efficiency obtained with turbomachinery up to date. In this cycle, the anticipated waste thermal energy of the exhaust of gas turbine is used to generate high-pressure steam to empower the steam turbine in the steam cycle. By systematically varying the main design parameters, their influence on the CPP plant can be revealed. A comprehensive parametric study was conducted to measure the influence of the main parameter of the gas and steam cycles on the performance of CPP. The results exhibit that the overall plant thermal efficiency is significantly greater than that of either of the two turbines. Due to the high thermal efficiency, a significant reduction in the greenhouse effect can be achieved. It is found that the regenerative steam cycle will reduce the overall efficiency of the combined cycle. On the other hand, using the reheat steam cycle in the CPP plant will lead to an increase in both the thermal efficiency of the plant and the dryness factor of steam at the exit of the steam turbine.

References

1.
OECD
,
2011
,
Towards Green Growth: Monitoring Progress: OECD Indicators
,
OECD Green Growth Studies, OECD Publishing
,
Paris
.
2.
Asif
,
M.
, and
Muneer
,
T.
,
2007
, “
Energy Supply, Its Demand and Security Issues for Developed and Emerging Economies
,”
Renewable Sustainable Energy Rev.
,
11
(
7
), pp.
1388
1413
. 10.1016/j.rser.2005.12.004
3.
Vatopoulos
,
K.
,
Andrews
,
D.
,
Carlsson
,
J.
,
Papaioannou
,
I.
, and
Zubi
,
G.
,
2012
, “
Study on the State of Play of Energy Efficiency of Heat and Electricity Production Technologies
,” https://setis.ec.europa.eu/system/files/4.Efficiencyo fheatandelectricityproductiontechnologies.pdf.
4.
Omosanya
,
A. J.
,
Akinlabi
,
E. T.
, and
Okeniyi
,
J. O.
,
2019
, “
Overview for Improving Steam Turbine Power Generation Efficiency
,”
J. Phys.: Conf. Ser.
,
1378
(
032040
), pp.
1
9
. 10.1088/1742-6596/1378/3/032040
5.
Poullikkas
,
A.
,
2005
, “
An Overview of Current and Future Sustainable gas Turbine Technologies
,”
Renewable Sustainable Energy Rev.
,
9
(
5
), pp.
409
443
. 10.1016/j.rser.2004.05.009
6.
Cerri
,
G.
,
1987
, “
Parametric Analysis of Combined Gas-Steam Cycles
,”
Trans. ASME J. Eng. Gas Turbines Power
,
109
(
1
), pp.
46
55
. 10.1115/1.3240005
7.
Bhinder
,
F. S.
, and
Mango
,
O. I. K.
,
1995
,
A Parametric Study of the Combined Power and Power (CPP) Plant for Generating Electricity
,
ASME Turbo Cogeneration
,
Vienna
.
8.
Horlock
,
J. H.
,
1995
, “
Combined Power Plants: Past, Present and Future
,”
ASME J. Eng. Gas Turbines Power
,
117
(
4
), pp.
608
616
. 10.1115/1.2815448
9.
Horlock
,
J. H.
,
1995
, “
The Optimum Pressure Ratio for a Combined Cycle Gas Turbine Plant
,”
Proc. Inst. Mech. Eng., Part A: J. Power Energy
,
209
(
4
), pp.
259
264
. 10.1243/PIME_PROC_1995_209_004_01
10.
Al-Anfaji
,
A. S. B.
,
2015
, “
The Optimization of Combined Power-Power Generation Cycles
,”
Ph.D. thesis
, https://uhra.herts.ac.uk/handle/2299/15485.
11.
Breeze
,
P.
,
2016
,
Gas Turbine Power Generation
, Chap. 7,
Elsevier Science & Technology Books
,
The Netherlands
, pp.
65
75
.
12.
Rao
,
A.
,
2012
,
Combined Cycle Systems for Near-Zero Emission Power Generation
,
Woodhead Publishing
,
Cambridge
.
13.
Cohen
,
H.
,
Rogers
,
G. F. C.
, and
Saravanamuttoo
,
H. I. H.
,
1996
,
Gas Turbine Theory
, 4th ed.,
Longman
,
London
14.
Incropera
,
F. P.
, and
DeWitt
,
D. P.
,
2002
,
Fundamentals of Heat and Mass Transfer
,
J. Wiley
,
New York
.
15.
El-Wakil
,
M. M.
,
1984
,
Power Plant Technology
,
McFraw-Hill Book Company
,
New York
.
16.
Press information
.
MHI Achieves 1,600 °C Turbine Inlet Temperature in Test Operation of World's Highest Thermal Efficiency “J-Series” Gas Turbine, 2011-05-26, No.1435
, https://www.mhi.com/news/1105261435.html.
17.
Cengel
,
Y.
, and
Boles
,
M.
,
2015
,
Thermodynamics: An Engineering Approach
, 8th ed.,
McGraw-Hill
,
New York
.
You do not currently have access to this content.