scholarly journals Reheat and Regenerative Gas Turbines for Feed Water Repowering of Steam Power Plant

1995 ◽  
Author(s):  
G. Negri di Montenegro ◽  
M. Gambini ◽  
A. Peretto
Keyword(s):  
Steam Turbine ◽  
Gas Turbine ◽  
Flow Rate ◽  
Gas Turbines ◽  
Power Plants ◽  
Feed Water ◽  
Brayton Cycle ◽  
Energy Integration ◽  
Steam Power ◽  
Steam Power Plants

This study is concerned with the repowering of existing steam power plants (SPP) by gas turbine (GT) units. The energy integration between SPP and GT is analyzed taking into particular account the employment of simple and complex cycle gas turbines. With regard to this, three different gas turbine has been considered: simple Brayton cycle, regenerative cycle and reheat cycle. Each of these cycles has been considered for feed water repowering of three different existing steam power plants. Moreover, the energy integration between the above plants has been analyzed taking into account three different assumptions for the SPP off-design conditions. In particular it has been established to keep the nominal value for steam turbine power output or for steam flow-rate at the steam turbine inlet or, finally, for steam flow-rate in the condenser. The numerical analysis has been carried out by the employment of numerical models regarding SPP and GT, developed by the authors. These models have been here properly connected to evaluate the performance of the repowered plants. The results of the investigation have revealed the interest of considering the use of complex cycle gas turbines, especially reheat cycles, for the feed water repowering of steam power plants. It should be taken into account that these energy advantages are determined by a repowering solution, i.e. feed water repowering which, although it is attractive for its simplicity, do not generally allows, with Brayton cycle, a better exploitation of the energy system integration in comparison with other repowering solutions. Besides these energy considerations, an analysis on the effects induced by repowering in the working parameters of existing components is also explained.

Using Fresh Air in Windbox Repowering of Existing Steam Power Plants

2007 ◽  
Author(s):  
V. Nayyeri ◽  
P. Asna Ashary
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Power Plants ◽  
Flame Temperature ◽  
Heat Transfer Process ◽  
Low Oxygen ◽  
Steam Power ◽  
Steam Power Plants ◽  
Gas Turbine Exhaust ◽  
Turbine Exhaust

Repowering is increasing efficiency and output power of an existing steam power plants by integration them with gas turbine. Several approaches are proposed for repowering regards to condition of existing power plants. One of those approaches which provides opportunity for existing boiler reusing is windbox repowering. In this method, one or several gas turbines are installed near the existing steam unit and the exhaust of gas turbines is used as preheated combustion air for boiler. The main difficulty in integration of gas turbine and boiler is decreasing flame temperature in supplementary combustion of boiler due to low oxygen content of gas turbine exhaust compared with fresh air and its effect on heat transfer process especially in radiative sections. When advanced gas turbines are used in windbox repowering, the fresh air should be used for increasing oxygen due to low oxygen percent. In this study, the effect of using fresh air in wind box repowering will be investigated and two main arrangements, preheating and not preheating of fresh air will be compared. This study shows the advantages of using preheated air for mixing with gas turbine exhaust when advanced gas turbines are used for windbox repowering.

The Role of Rotor Welding Design in Meeting Future Market Requirements

2013 ◽  
Author(s):  
T.-U. Kern ◽  
H. Almstedt ◽  
Th. Thiemann ◽  
S. Brussk ◽  
K. Niepold
Keyword(s):  
Steam Turbine ◽  
Power Plants ◽  
Turbine Rotor ◽  
Future Market ◽  
Higher Plant ◽  
Steam Power ◽  
Material Development ◽  
Steam Power Plants ◽  
High Efficient ◽  
Technical Features

The demand for current and future steam turbine components is driven by higher efficiency but also by higher plant cycling needs and optimized cost balance. An increase in efficiency increases the demand for higher life steam temperatures of up to 620/630°C for today’s units and of even up to 720°C for future steam power plants. The gap between required material properties in the hot and cold running parts of a steam turbine rotor is widened by the increased live steam temperatures and the increased demand for flexibility and adaptability to current and expected future energy market conditions. Besides further material development, welding is one measure to realize such contradictory rotor characteristics. Whereas 720°C is more a future related task, solutions for 560°C / 620°C apply already welded rotors. The paper discusses from a perspective of a steam turbine manufacturer the technical features to enable flexible high efficient rotor components with a focus on advanced welding technologies suitable for different large steam turbine components and what further steps for new welding technologies are under way.

Proven Practices in Chemical Control for Steam Power Plants

1967 ◽  
Vol 89 (3) ◽  
pp. 305-309
Author(s):  
F. G. Straub
Keyword(s):  
Water Treatment ◽  
Steam Turbine ◽  
Power Plants ◽  
Water Soluble ◽  
Steam Power ◽  
Boiler Water ◽  
Internal Corrosion ◽  
Steam Power Plants ◽  
The University ◽  
Water Treatments

The author has conducted research on boiler water treatment at the University of Illinois and in many steam power plants during the last forty-three years. This research covered the cause and prevention of water soluble and silica deposits in steam turbine, metal losses in the wet steam areas of the steam turbine, metal pickup in the preboiler feedwater cycle, internal corrosion in boiler tubes including oxygen embrittlement. The author reports that with proper control of the water treatment these difficulties can be prevented. He outlines the water treatments used and reports the favorable results obtained in boilers, many of which have operated for over twenty years (600–2600 psi). He also reports on the operation of a large number of boilers which have operated for a similar number of years without requiring internal acid cleaning. These results only cover the operation of conventional boilers with natural and controlled circulation.

Performance Analysis of a 565 MW Steam Power Plant

2011 ◽  
Author(s):  
R. Chacartegui ◽  
D. Sa´nchez ◽  
J. A. Becerra ◽  
A. Mun˜oz ◽  
T. Sa´nchez
Keyword(s):  
Power Plant ◽  
Power Plants ◽  
Operating Conditions ◽  
Feed Water ◽  
Water Heater ◽  
Turbine Generator ◽  
Steam Power ◽  
Steam Power Plant ◽  
Water Heaters ◽  
Steam Power Plants

In this work, a tool to predict the performance of fossil fuel steam power plants under variable operating conditions or under maintenance operations has been developed. This tool is based on the Spencer-Cotton-Cannon method for large steam turbine generator units. The tool has been validated by comparing the predicted results at different loads with real operating data of a 565 MW steam power plant, located in Southern Spain. The results obtained from the model show a good agreement with most of the power plant parameters. The simulation tool has been then used to predict the performance of a steam power plant in different operating conditions such as variable terminal temperature difference or drain cooler approach of the feed-water heaters, or under maintenance conditions like a feed-water heater out of service.

scholarly journals Up-Rated Reheat Gas Turbine for the Repowering of Steam Power Plants

1999 ◽  
Author(s):  
G. Negri di Montenegro ◽  
A. Peretto ◽  
E. Mantino
Keyword(s):  
Gas Turbine ◽  
Power Plants ◽  
Fossil Fuel ◽  
Lower Cost ◽  
Combined Cycle ◽  
Internal Rate Of Return ◽  
Steam Power ◽  
Steam Power Plants ◽  
Combined Cycles ◽  
Fossil Fuel Power Plants

In the present paper, a thermoeconomic analysis of combined cycles derived from existing steam power plants is performed. The gas turbine employed is a reheat gas turbine. The increase of the two combustor outlet temperatures was also investigated. The study reveals that the transformation of old conventional fossil fuel power plants in combined cycle power plants with reheat gas turbine supplies a cost per kWh lower than that of a new combined cycle power plant, also equipped with reheat gas turbine. This occurs for all the repowered plants analyzed. Moreover, the solution of increasing the two combustor outlet temperatures resulted a strategy to pursue, leading, in particular, to a lower cost per kWh, Pay Back Period and to a greater Internal Rate of Return.

Analysis of fouling thermal resistance of feed-water heaters in steam power plants

2009 ◽  
Vol 16 (Special) ◽  
Author(s):  
Dariusz Butrymowicz ◽  
Jerzy Głuch ◽  
Tomasz Hajduk ◽  
Marian Trela ◽  
Andrzej Gardzilewicz
Keyword(s):  
Thermal Resistance ◽  
Power Plants ◽  
Feed Water ◽  
Steam Power ◽  
Water Heaters ◽  
Steam Power Plants

Gas Turbine Propulsion for LNG Transports

2006 ◽  
Author(s):  
Louis Ellington ◽  
Glenn McAndrews ◽  
Alexander Harsema-Mensonides ◽  
Ravi Tanwar
Keyword(s):  
Steam Turbine ◽  
Gas Turbine ◽  
Steam Generator ◽  
Gas Turbines ◽  
Operating Cost ◽  
Dual Fuel ◽  
Feed Water ◽  
Slow Speed ◽  
Turbine Generator ◽  
Water Steam

GE aero-derivative gas turbines were first introduced into marine operations during the late 1960’s and early 1970’s. GE is now leveraging its many years of proven marine experience and offshore dual-fuel experience to offer dual-fuel gas turbines for LNG Carrier (LNGC) propulsion and electric power. With building of new larger LNGC’s now beginning, the industry is seriously considering a change to gas turbine based systems in order to capitalize on their many advantages. CoGES (combined gas turbine — steam generator electric) plants for LNGC’s consist of dual-fueled gas-turbine-generator (GTG) set(s) and auxiliaries, heatrecovery steam generator (HSRG), a steam-turbine-generator set, feed-water, steam and condensate systems. Leveraging cruise-ship reliability programs, the GTG instrumentation and control systems are single-point fault tolerant. Gas turbine power plants offer many additional advantages, including but not limited to: Use of boil-off gas as a cost-effective and environmentally friendly fuel (slow speed diesel ships require complex on-board reliquifaction of boil-off gas). When installed on deck, CoGES plants provide high power-volume density that translates into increased cargo revenue and deferred capital cost. Gas turbines ease of maintenance and quick changeout. Developed to meet the International Code for the Construction and Equipment of Ships Carrying Liquefied Gases in Bulk (IGC) and classification society standards for marine applications, GE’s 2 X LM2500 CoGES plant is a very simple and reliable solution. Dry-run capable HRSG’s are used in lieu of exhaust damper and by-pass systems. Outage of any one prime mover leaves the plant with nominally 50% power remaining. Common spares are inherent. Established as having an equivalent level of safety as traditional LNGC propulsion systems via FMECA type studies, the 2 x dual-fueled LM2500 CoGES plant has been “Approved in Principle” by Class for use on LNG Carriers. Alternatively, GE’s 1 X dual-fueled LM6000 or 1 X LM2500+/G4 CoGES plant addresses capital & operating cost pressures via reduced equipment costs and improved fuel economy. Redundancy and simplicity are achieved via a dry-run capable HRSG and an STG, combined with auxiliary diesel generator sets. Both the LM2500 family and LM6000 CoGES plants offer viable alternatives to traditional steam turbine and slow-speed-diesel propulsion. Gas-fuel, liquid-fuel, and bi-fuel operation provide flexibility and redundancy to ship owners who must safely and reliably deliver cargo at the lowest possible cost per MMBTU throughout a fleet life cycle.

Thermal and Economic Analysis of Besat Steam Power Plant Repowering

2006 ◽  
Author(s):  
Sepehr Sanaye ◽  
Younes Hamzeie ◽  
Mohammad Reza Malekian ◽  
Mohammad Reza Sohrabi
Keyword(s):  
Power Generation ◽  
Power Plant ◽  
Gas Turbine ◽  
Capital Investment ◽  
Power Plants ◽  
Design Parameters ◽  
Inlet Temperature ◽  
Steam Power ◽  
Total Cost ◽  
Steam Power Plants

There is a rapid growth of electricity consumption in the world. This problem needs enough resources for capital investment for construction of new power plants and/or making all efforts to increase the thermal efficiency of existing power generation cycles. Therefore this situation has lead power generation industries to repower and modify the existing steam power plants which are constructed in the recent three or four decades. In this paper an important method for repowering of old steam power plants which uses a gas turbine is analyzed. Hot Wind Box (HWB) repowering method was technically and economically evaluated to repower the Besat steam power plant. This power plant was constructed and exploited in 1967 in Tehran. The optimum design parameters such as gas turbine power output, compressor and turbine isentropic efficiency, pressure ratio, and the ratio of turbine inlet temperature to compressor inlet temperature were found by defining an objective function the total cost per unit of repowered plant power output and using numerical search optimization technique for its minimizing. The objective function, the total cost, included initial or capital investment, operation and maintenance costs during plant life cycle. The numerical values of optimum design parameters and the results of the sensitivity analysis are reported.

scholarly journals EXPERIMENTAL STUDY OF UTILIZING SOLAR ENERGY TO HEAT FEED WATER IN REGENEATIVE STEAM POWER PLANTS

2018 ◽  
Vol 22 (02) ◽  
pp. 94-107
Author(s):  
Ghanim Kadhim Abdulsada ◽  
◽  
Dhamyaa Saad Khudhur ◽  
Moamin Mahdi Aisa ◽  
◽  
...  
Keyword(s):  
Experimental Study ◽  
Solar Energy ◽  
Power Plants ◽  
Feed Water ◽  
Steam Power ◽  
Steam Power Plants
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