A Cost-Effective Indirect Coal-Fired Gas Turbine Power and Water-From-Air Cycle

1985 ◽  
Vol 107 (4) ◽  
pp. 861-869 ◽  
Author(s):  
P. R. Trumpler
Keyword(s):  
Gas Turbine ◽  
Cost Effective ◽  
Inlet Temperature ◽  
Turbine Plant ◽  
Air Heater ◽  
Gas Turbine Plant ◽  
The Cost ◽  
Gas Turbine Cycle ◽  
Steam Plant ◽  
Plant Capacity

An ideal open gas turbine cycle with multiple-stage intercooled compression and multiple-stage reheat expansion theoretically approaches Carnot thermal efficiency. A proposed practicable process to utilize this cycle with indirect firing of coal as fuel, with an air heater in place of the boiler, a turbine inlet temperature of 1700°F (927°C) and top pressure of 788 psia (53.6 atm) gives promise of lowering power plant station heat rates (HHV) from 8970 Btu/kWh currently realized by the best scrubber-equipped coal fired steam plants to 7460, a reduction of 16.8% in fuel consumption and consequently the cost of flue gas scrubbers. In addition, a 316 MW plant delivers at rated output 130,000 gal per day water stripped from atmospheric air. Primarily because of an expensive air heater and regenerator the gas turbine plant is penalized by an estimated increase in initial cost from $1000/kW for a steam plant to $1433/kW. With coal priced at $3/million Btu, water selling at 2¢/gal, money at 8% interest, inflation at 5%, and an 81% plant capacity factor, the payback period is 17 years.

Thermodynamic Study of Humid Air Gas Turbine Cycle Power Plants

2005 ◽  
Author(s):  
R. Yadav ◽  
P. Sreedhar Yadav
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Power Plants ◽  
Substantial Reduction ◽  
Thermodynamic Study ◽  
Humid Air ◽  
Turbine Plant ◽  
Design Engineers ◽  
Gas Turbine Plant ◽  
Gas Turbine Cycle

The major challenges before the design engineers of a gas turbine plant and its variants are the enhancement of power output, substantial reduction in NOx emission and improvement in plant thermal efficiency. There are various possibilities to achieve these objectives and humid air gas turbine cycle power plant is one of them. The present study deals with the thermodynamic study of humid air gas turbine cycle power plants based on first law. Using the modeling and governing equations, the parametric study has been carried out. The results obtained will be helpful in designing the humid air gas turbines, which are used as peaking units. The comparison of performance of humid air gas turbine cycle shows that it is superior to basic gas turbine cycle but inferior and more complex to steam injected cycle.

The Optimum Pressure Ratio for a Combined Cycle Gas Turbine Plant

1995 ◽  
Vol 209 (4) ◽  
pp. 259-264 ◽  
Author(s):  
J H Horlock
Keyword(s):  
Gas Turbine ◽  
Pressure Ratio ◽  
Combined Cycle ◽  
Maximum Efficiency ◽  
Specific Work ◽  
Optimum Pressure ◽  
Turbine Plant ◽  
Gas Turbine Plant ◽  
Overall Efficiency ◽  
Gas Turbine Cycle

A graphical method of calculating the performance of gas turbine cycles, developed by Hawthorne and Davis (1), is adapted to determine the pressure ratio of a combined cycle gas turbine (CCGT) plant which will give maximum overall efficiency. The results of this approximate analysis show that the optimum pressure ratio is less than that for maximum efficiency in the higher level (gas turbine) cycle but greater than that for maximum specific work in that cycle. Introduction of reheat into the higher cycle increases the pressure ratio required for maximum overall efficiency.

scholarly journals A Proposed Gas-Turbine Propulsion Plant for Great Lakes Ore Carriers

1963 ◽  
Author(s):  
T. E. Stott
Keyword(s):  
Great Lakes ◽  
Gas Turbine ◽  
Present Status ◽  
Operating Costs ◽  
Plant Selection ◽  
Turbine Plant ◽  
Machinery Plant ◽  
New Construction ◽  
Gas Turbine Plant ◽  
Steam Plant

The present status of overage ships in the Great Lakes bulk carrying fleet, the problems of economic replacement, and the requirements for main propulsion and auxiliary machinery are delineated. With established requirements, the paper develops a gas-turbine machinery plant and compares it to the steam plant used in recent construction. The operating and environmental conditions existing on the Great Lakes are presented as influencing factors in the final plant selection. The study concludes that there is an existing need for new construction to replace obsolete vessels and that the gas-turbine plant will be lower in initial and operating costs when compared with the steam plant, for this application.

A Thermo-Environmental Evaluation of a Modified Combustion Gas Turbine Plant

2018 ◽  
Vol 141 (4) ◽  
Author(s):  
Abdul Khaliq ◽  
M. A. Habib ◽  
Keshavendra Choudhary
Keyword(s):  
Relative Humidity ◽  
Gas Turbine ◽  
Air Cooling ◽  
Moderate Increase ◽  
Turbine Plant ◽  
Combustion Gas ◽  
Ambient Relative Humidity ◽  
Co Concentration ◽  
Gas Turbine Plant ◽  
Gas Turbine Cycle

This paper reports the comprehensive thermodynamic modeling of a modified combustion gas turbine plant where Brayton refrigeration cycle was employed for inlet air cooling along with evaporative after cooling. Exergetic evaluation was combined with the emission computation to ascertain the effects of operating variables like extraction pressure ratio, extracted mass rate, turbine inlet temperature (TIT), ambient relative humidity, and mass of injected water on the thermo-environmental performance of the gas turbine cycle. Investigation of the proposed gas turbine cycle revealed an exergetic output of 33%, compared to 29% for base case. Proposed modification in basic gas turbine shows a drastic reduction in cycle's exergy loss from 24% to 3% with a considerable decrease in the percentage of local irreversibility of the compressor from 5% to 3% along with a rise in combustion irreversibility from 19% to 21%. The environmental advantage of adding evaporative after cooling to gas turbine cycle along with inlet air cooling can be seen from the significant reduction of NOx from 40 g/kg of fuel to 1 × 10−9 g/kg of fuel with the moderate increase of CO concentration from 36 g/kg of fuel to 99 g/kg of fuel when the fuel–air equivalence ratio reduces from 1.0 to 0.3. Emission assessment further reveals that the increase in ambient relative humidity from 20% to 80% causes a considerable reduction in NOx concentration from 9.5 to 5.8 g/kg of fuel while showing a negligible raise in CO concentration from 4.4 to 5.0 g/kg of fuel.

scholarly journals Long-Time Operating Experiences With Oberhausen Closed-Cycle Gas-Turbine Plant

1970 ◽  
Author(s):  
Gerhard Deuster
Keyword(s):  
Heat Exchanger ◽  
Gas Turbine ◽  
Closed Cycle ◽  
Turbine Plant ◽  
Air Heater ◽  
Cold State ◽  
Long Time ◽  
Gas Turbine Plant

Calculations made prior to building the Oberhausen closed-cycle gas-turbine plant have been fully confirmed after nine years of operation. Operating experiences reviewed are (a) with the air heater, including radiation parts, convection part, brickwork, and double-jacket pipe; (b) with the machine set, including LP and HP compressors, turbine, and gearing; (c) with the heat-exchanging units, including heat exchanger, precooler, and intercoolers; (d) deceleration and acceleration of the machine to/from cold state. Breakdowns and failures referred to were of the sort that can be avoided both safely and cheaply by applying the experience we have now accumulated.

Experimental Determination of the Heat Recovery Boiler Effectiveness of a Gas Turbine Plant

2014 ◽  
Vol 659 ◽  
pp. 503-508
Author(s):  
Sorin Gabriel Vernica ◽  
Aneta Hazi ◽  
Gheorghe Hazi
Keyword(s):  
Experimental Data ◽  
Gas Turbine ◽  
Heat Recovery ◽  
Heat Recovery Boiler ◽  
Experimental Point ◽  
Experimental Data Processing ◽  
Turbine Plant ◽  
Transfer Unit ◽  
Gas Turbine Plant ◽  
Recovery Boiler

Increasing the energy efficiency of a gas turbine plant can be achieved by exhaust gas heat recovery in a recovery boiler. Establishing some correlations between the parameters of the boiler and of the turbine is done usually based on mathematical models. In this paper it is determined from experimental point of view, the effectiveness of a heat recovery boiler, which operates together with a gas turbine power plant. Starting from the scheme for framing the measurement devices, we have developed a measurement procedure of the experimental data. For experimental data processing is applied the effectiveness - number of transfer unit method. Based on these experimental data we establish correlations between the recovery boiler effectiveness and the gas turbine plant characteristics. The method can be adapted depending on the type of flow in the recovery boiler.

scholarly journals Comparison of Various Fluidized Bed Combustor-Gas Turbine Systems

1985 ◽  
Author(s):  
Arthur P. Fraas
Keyword(s):  
Gas Turbine ◽  
Fluidized Bed ◽  
Thermal Efficiency ◽  
Combustion Efficiency ◽  
Capital Cost ◽  
Inlet Temperature ◽  
Extensive Experience ◽  
Helium Gas ◽  
Steam Plant ◽  
Fluidized Bed Combustor

Pressurizing a fluidized bed combustor with a gas turbine greatly improves both sulfur retention and combustion efficiency. Operating the gas turbine with a high inlet temperature (e.g. 900°C) would yield a thermal efficiency about four points higher than for an atmospheric furnace, but 40 y of experience have failed to solve problems with flyash erosion and deposits. Extensive experience such as that with fluidized bed catalytic cracking units indicates that the gas turbine blade erosion and deposit problems can be handled by dropping the turbine inlet temperature below 400°C where the turbine delivers just enough power to drive the compressor. The resulting thermal efficiency is about half a point higher than for an atmospheric bed, and the capital cost of the FBC-related components is about 40% lower. While a closed-cycle helium gas turbine might be used rather than a steam cycle, the thermal efficiency would be about four points lower and the capital cost of the FBC-related components would be roughly twice that for the corresponding steam plant.

Sign in / Sign up

Export Citation Format

Share Document