scholarly journals Effects of Nonuniform Flow Distribution on Marine Gas Turbine Waste-Heat Steam Generators

1984 ◽  
Author(s):  
Ho-Tien Shu ◽  
Simion C. Kuo ◽  
M. Keith Ellingsworth
Keyword(s):  
Gas Turbine ◽  
Steam Generator ◽  
Gas Flow ◽  
Waste Heat ◽  
Guide Vane ◽  
Flow Distribution ◽  
Distribution Data ◽  
Nonuniform Flow ◽  
Steam Generators ◽  
And Performance

The results of a study to investigate the effect of nonuniform gas flow distribution on the design and performance of gas turbine waste-heat steam generators particularly for marine propulsion applications are presented. Also included are a review of major design requirements and critical problems associated with nonuniform flow distribution in waste-heat steam generators and a two-dimensional heat exchanger model developed for parametric design and performance analysis of gas turbine waste-heat steam generators. This study is based on actual gas flow distribution data measured at the exit of the collector box for a typical marine gas turbine operated at full and half power conditions. The results indicate that 1) the overall heat transfer rate of a steam generator with nonuniform inlet flow is approximately 16% less than that obtainable based on uniform flow distribution, which represents a decrease in the exit steam temperature from 700 to 450 F; and 2) with appropriate flow distribution controls (using one flow guide vane and one location for flow injection to suppress boundary layer separation), the steam generator performance can be improved by approximately 20% as compared with that for the uncontrolled nonuniform flow conditions.

Flow Distribution Characteristics and Control in Marine Gas Turbine Diffusers

1984 ◽  
Vol 106 (3) ◽  
pp. 654-660
Author(s):  
M. K. Ellingsworth ◽  
Ho-Tien Shu ◽  
S. C. Kuo
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Heat Recovery ◽  
Waste Heat Recovery ◽  
Waste Heat ◽  
Flow Distribution ◽  
Distribution Characteristics ◽  
Nonuniform Flow ◽  
Technical Problems ◽  
And Control

The object of this study was to investigate flow distribution characteristics and control in the marine gas turbine diffusers most suitable for waste heat recovery systems. The major technical problems associated with nonuniform flow distributions in heat-exchanger or flow-equipment systems were reviewed. Various means to alleviate or minimize these undesirable problems were evaluated. Four sets of candidate flow-distribution data were selected from the measured exhaust velocities of typical marine gas turbines for input to the present study. A two-dimensional turbulent flow model for diffusers was developed and computerized, and five diffuser geometries suitable for marine gas turbine waste-heat recovery applications were investigated, based on the actual inlet velocity data. The exit flow distribution characteristics (velocity, mass-flux, pressure recovery, and temperature) and diffuser performance with and without flow-distribution controls were analyzed using the computer programs developed. It was found that nonuniform flow distribution in the gas turbine exhaust can reduce diffuser efficiency to half of that attainable with uniform flow, and that the diffuser exhaust velocities will be more uniform by using guide vanes and/or flow injection than merely using nonsymmetric diffusion angles. The diffuser efficiency can be improved 20 to 36 percentage points by using these contort means.

scholarly journals General Design Considerations for Gas Turbine Waste Heat Steam Generators

1968 ◽  
Author(s):  
W. V. Hambleton
Keyword(s):  
Gas Turbine ◽  
Heat Recovery ◽  
Waste Heat ◽  
Steam Generation ◽  
Steam Generators ◽  
Design Considerations ◽  
Exhaust Heat ◽  
Gas Turbine Exhaust ◽  
Exhaust Heat Recovery ◽  
Turbine Exhaust

This paper represents a study of the overall problems encountered in large gas turbine exhaust heat recovery systems. A number of specific installations are described, including systems recovering heat in other than the conventional form of steam generation.

scholarly journals Gas Turbine Heat Recovery Steam Generators for Combined Cycles Natural or Forced Circulation Considerations

1988 ◽  
Author(s):  
Akber Pasha
Keyword(s):  
Gas Turbine ◽  
Steam Generator ◽  
Heat Recovery ◽  
Power Plants ◽  
Natural Circulation ◽  
Combined Cycle ◽  
Heat Recovery Steam Generator ◽  
Steam Generators ◽  
Forced Circulation ◽  
Gas Turbine Exhaust

In recent years the combined cycle has become a very attractive power plant arrangement because of its high cycle efficiency, short order-to-on-line time and flexibility in the sizing when compared to conventional steam power plants. However, optimization of the cycle and selection of combined cycle equipment has become more complex because the three major components, Gas Turbine, Heat Recovery Steam Generator and Steam Turbine, are often designed and built by different manufacturers. Heat Recovery Steam Generators are classified into two major categories — 1) Natural Circulation and 2) Forced Circulation. Both circulation designs have certain advantages, disadvantages and limitations. This paper analyzes various factors including; availability, start-up, gas turbine exhaust conditions, reliability, space requirements, etc., which are affected by the type of circulation and which in turn affect the design, price and performance of the Heat Recovery Steam Generator. Modern trends around the world are discussed and conclusions are drawn as to the best type of circulation for a Heat Recovery Steam Generator for combined cycle application.

Flow Guiding and Distributing Devices on the Exhaust Side of Stationary Gas Turbines

1990 ◽  
Vol 112 (1) ◽  
pp. 80-85
Author(s):  
F. Fleischer ◽  
C. Koerner ◽  
J. Mann
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Gas Flow ◽  
Flow Simulation ◽  
Exhaust System ◽  
Flow Distribution ◽  
Scale Model ◽  
Gas Turbine Exhaust ◽  
First Time ◽  
Turbine Exhaust

Following repeated cases of damage caused to exhaust silencers located directly beyond gas turbine diffusers, this paper reports on investigations carried out to determine possible remedies. In all instances, an uneven exhaust gas flow distribution was found. The company’s innovative approach to the problem involved constructing a scale model of a complete gas turbine exhaust system and using it for flow simulation purposes. It was established for the first time that, subject to certain conditions, the results of tests conducted on a model can be applied to the actual turbine exhaust system. It is shown that when an unfavorable duct arrangement might produce an uneven exhaust flow, scale models are useful in the development of suitable flow-distributing devices.

scholarly journals Combined Gas and Steam Cycle for a Gas-Cooled Solar Tower Power Plant

1981 ◽  
Author(s):  
B. Becker ◽  
H. H. Finckh ◽  
R. Meyer-Pittroff
Keyword(s):  
Power Plant ◽  
Energy Conversion ◽  
Gas Turbine ◽  
Steam Generator ◽  
Solar Power ◽  
Waste Heat ◽  
Radiant Energy ◽  
Combined Cycle ◽  
Conversion System ◽  
Energy Conversion System

In gas-cooled solar power plants the radiant energy of the sun is transferred to the cycle fluid in a cavity type solar receiver and converted into electric energy by means of a combined gas and steam turbine cycle incorporating a waste heat steam generator. The design and optimization of the energy conversion system in accordance with solar-specific considerations are described with particular regard to the gas turbine. In designing the energy conversion system several variants on the combined cycle with waste heat steam generator are investigated and special measures for the improvement of the cycle efficiency, such as the refinement of the steam process through the addition of pressure stages are introduced. It is demonstrated that the solar power plant meets the requirements both for straight solar and constant load operation with fossil fuel substitution. In order to establish the possibilities of attaining high part-load efficiencies in straight solar operation, two modes, variable and constant speed of the gas turbine, are compared with one another.

Selective Catalytic Reduction Impact on Heat Recovery Steam Generator Design and Operation

1986 ◽  
Author(s):  
James S. Davis ◽  
G. C. Duponteil
Keyword(s):  
Selective Catalytic Reduction ◽  
Gas Turbine ◽  
Steam Generator ◽  
Heat Recovery ◽  
Gas Flow ◽  
High Efficiency ◽  
Catalytic Reduction ◽  
Nox Reduction ◽  
Heat Recovery Steam Generator ◽  
The Impact

Selective Catalytic Reduction (SCR) is a post-combustion method to reduce the oxides of nitrogen (NOx), present in flue gases such as gas turbine exhaust streams, to N2 and water. It involves the injection of ammonia and the use of a catalyst module to promote the reaction to obtain high efficiency (60–86+%) NOx reduction. Several operating parameters can influence catalyst performance to include temperature, gas flow distribution, presence of sulfur compounds and catalyst age. This paper examines the impact of a SCR integration in a gas turbine heat recovery steam generator (HRSG) design/operation. Limitations on HRSG load and following capabilities, effect on capital cost and overall performance and current SCR system experience represent a number of areas that are examined.

scholarly journals Numerical simulation of gas flow and droplet motion in a wave-plate eliminator of the separator-steam-generator system in the waste-heat-utilisation complex

2017 ◽  
Vol 159 ◽  
pp. 00002
Author(s):  
Valerij Artemov ◽  
Konstantin Minko ◽  
Georgij Yankov ◽  
Anton Ptakhin ◽  
Anton Kondratev ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Steam Generator ◽  
Gas Flow ◽  
Waste Heat ◽  
Generator System ◽  
Droplet Motion ◽  
Wave Plate

Investigations on Dynamic Behaviour of Heat Recovery Steam Generators Carried Out With a Commercial Software Program

2007 ◽  
Author(s):  
Gottfried Brandstetter ◽  
Christian Daublebsky
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Heat Recovery ◽  
Waste Heat ◽  
Important Process ◽  
Steel Mill ◽  
Steam Generators ◽  
Commercial Software ◽  
Software Program ◽  
Firing System

Heat recovery steam generators (HRSGs) downstream of gas turbines are often used in combination with process steam applications. A HRSG trip is more severe in applications with highly important process steam than in applications producing only electricity. HRSGs in important process steam applications can be equipped with a supplementary and fresh air firing system having the capacity of replacing at least the total waste heat coming from the gas turbine. A fresh air firing system provides the capability of keeping the HRSG in operation without the gas turbine running. If the HRSG is required to stay in operation even after a gas turbine trip, a change over from waste heat firing to fresh air firing has to follow immediately. The gas turbine speed rundown after a trip occurs very rapidly, so the change over procedure has to be carried out within a few seconds to avoid a HRSG shut down. Enormous gradients of heat input and steam mass flow extracted from the HRSG occur in such cases. This will cause the HRSG parameters to deviate considerably from the steady state, thus conventional HRSG calculations cannot be used in such cases. The thermal inertia of the HRSG needs to be considered, which requires the use of special software programs. A commercial boiler software program with a dynamic calculation module for unsteady calculations was utilized and a comparison with data gathered from the operation of the HRSG was performed. The boiler performance parameters during change over procedures were investigated in detail using extensive measurements at an Austrian steel mill (VOESTALPINE). The parameters of this investigation were compared with calculation results gained from a commercial software program for validation purposes. This comparison will enable predictions to be made for future projects with sufficient accuracy, which will allow the risk to be reduced when offering guarantees in this regard.

Combined Gas and Steam Cycle for a Gas-Cooled Solar Tower Power Plant

1982 ◽  
Vol 104 (2) ◽  
pp. 330-340 ◽  
Author(s):  
B. Becker ◽  
H. H. Finckh ◽  
R. Meyer-Pittroff
Keyword(s):  
Power Plant ◽  
Energy Conversion ◽  
Gas Turbine ◽  
Steam Generator ◽  
Solar Power ◽  
Waste Heat ◽  
Radiant Energy ◽  
Combined Cycle ◽  
Conversion System ◽  
Energy Conversion System

In gas-cooled solar power plants the radiant energy of the sun is transferred to the cycle fluid in a cavity type solar receiver and converted into electric energy by means of a combined gas and steam turbine cycle incorporating a waste heat steam generator. The design and optimization of the energy conversion system in accordance with solar-specific considerations are described with particular regard to the gas turbine. In designing the energy conversion system several variants on the combined cycle with waste heat steam generator are investigated and special measures for the improvement of the cycle efficiency, such as the refinement of the steam process through the addition of pressure stages are introduced. It is demonstrated that the solar power plant meets the requirements both for straight solar and constant load operation with fossil fuel substitution. In order to establish the possibilities of attaining high part-load efficiencies in straight solar operation, two modes, variable and constant speed of the gas turbine, are compared with one another.

Sign in / Sign up

Export Citation Format

Share Document