Method for assessment of the thermal efficiency of thermotransformers of the combined type for air cooling at the inlet of the regenerative gas turbine plant

2016 ◽  
Vol 0 (3) ◽  
Author(s):  
Andrii M. Radchenko ◽  
Serhii A. Kantor
Keyword(s):  
Gas Turbine ◽  
Thermal Efficiency ◽  
Air Cooling ◽  
Turbine Plant ◽  
Gas Turbine Plant

Thermodynamic Analysis of Air-Cooled Gas Turbine Plants

2000 ◽  
Vol 123 (2) ◽  
pp. 265-270 ◽  
Author(s):  
E. A. Khodak ◽  
G. A. Romakhova
Keyword(s):  
Gas Turbine ◽  
Gas Turbines ◽  
Direct Determination ◽  
Thermodynamic System ◽  
Flow Diagram ◽  
Air Cooling ◽  
Open Steam ◽  
Turbine Plant ◽  
Turbine Cooling ◽  
Gas Turbine Plant

At present high temperature, internally cooled gas turbines form the basis for the development of highly efficient plants for utility and industrial markets. Minimizing irreversibility of processes in all components of a gas turbine plant leads to greater plant efficiency. Turbine cooling, like all real processes, is an irreversible process and results in lost opportunity for producing work. Traditional tools based on the first and second laws of thermodynamics enable performance parameters of a plant to be evaluated, but they give no way of separating the losses due to cooling from the overall losses. This limitation arises from the fact that the two processes, expansion and cooling, go on simultaneously in the turbine. Part of the cooling losses are conventionally attributed to the turbine losses. This study was intended for the direct determination of lost work due to cooling. To this end, a cooled gas turbine plant has been treated as a work-producing thermodynamic system consisting of two systems that exchange heat with one another. The concepts of availability and exergy have been used in the analysis of such a system. The proposed approach is applicable to gas turbines with various types of cooling: open-air, closed-steam, and open-steam cooling. The open-air cooling technology has found the most wide application in current gas turbines. Using this type of cooling as an example, the potential of the developed method is shown. Losses and destructions of exergy in the conversion of the fuel exergy into work are illustrated by the exergy flow diagram.

The Basic Thermodynamics of Turbine Cooling

2000 ◽  
Vol 123 (3) ◽  
pp. 583-592 ◽  
Author(s):  
J. H. Horlock
Keyword(s):  
Gas Turbine ◽  
Thermal Efficiency ◽  
Combustion Temperature ◽  
Plant Performance ◽  
Maximum Temperature ◽  
Working Fluid ◽  
Turbine Plant ◽  
Cooling Flows ◽  
Turbine Cooling ◽  
Gas Turbine Plant

Analyses of gas turbine plant performance, including the effects of turbine cooling, are presented. The thermal efficiencies are determined theoretically, assuming air standard (a/s) cycles, and the reductions in efficiency due to cooling are established; it is shown that these are small, unless large cooling flows are required. The theoretical estimates of efficiency reduction are compared with calculations, assuming that real gases form the working fluid in the gas turbine cycles. It is shown from a/s analysis that there are diminishing returns on efficiency as combustion temperature is increased; for real gases there appears to be a limit on this maximum temperature for maximum thermal efficiency.

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.

Thermo-Economic Analysis of Inlet Air Conditioning Methods of a Cogeneration Gas Turbine Plant

2002 ◽  
Author(s):  
M. Nixdorf ◽  
A. Prelipceanu ◽  
D. Hein
Keyword(s):  
Gas Turbine ◽  
Air Conditioning ◽  
Thermal Power ◽  
Evaporative Cooling ◽  
Ambient Air ◽  
Air Cooling ◽  
Ambient Conditions ◽  
Reference Case ◽  
Turbine Plant ◽  
Gas Turbine Plant

The purpose of this work is to investigate the benefits of some different ambient air conditioning methods for reducing the gas turbine intake air temperature in order to enhance the gas turbine power. As a reference case the combined heat and power plant of the campus area of the Technische Universita¨t Mu¨nchen in Garching is considered, which is equipped with an Allison KH501 Cheng Cycle gas turbine. Three novel technical possibilities of ambient air cooling and power augmentation are shown in detail (desiccant dehumidification and evaporative cooling, absorption chiller unit with air cooler, evaporative cooling at increased inlet air pressure). Based on site ambient conditions and measured yearly load lines for heat and electrical power connected with actual cost functions, the potential economic savings are worked out for the different technical modifications using ambient air cooling for power augmentation of the gas turbine plant. The economic operation lines for power and heat, supplied by the modified gas turbine plant, are calculated by a cost optimization system. The results are compared based on investment costs and economic savings by the extended annual electrical and thermal power production of the modified gas turbine plant.

scholarly journals Investigation Into the Adaptibility of the Modified Exhaust-Heated Gas Turbine Installation to the Operation With an Air Extraction

1991 ◽  
Author(s):  
Joseph A. Golinski
Keyword(s):  
Gas Turbine ◽  
Thermal Efficiency ◽  
Electrical Power ◽  
Chemical Processing ◽  
Turbine Plant ◽  
Coal Gasifier ◽  
Compressor Inlet ◽  
Gas Turbine Plant ◽  
Turbine Installation ◽  
Asme Paper

This paper is a continuation of investigation into the possibilities of industrial application of the modified exhaustheated gas turbine installation with increased thermal efficiency, described in the ASME-Paper 90-GT-369. According to the author’s conception this turbine installation may be very useful when interacting with some chemical processing installations, e.g. by feeding a coal gasifier with pre-heated compressed air. It would then be a turbine system with an air extraction, performing a double duty. The heat contained in the air extracted from the gas turbine system plus the mechanical/electrical power produced create permanent full load conditions yielding the maximum thermal efficiency of the system. It has been found that for some point of extraction from a gas turbine plant of 33 % efficiency (without air extraction) the overall efficiency may raise to some 60 or even 73 %. This is possible due to the fact that the enthalpy increase of the extracted air is calculated with respect to that of the compressor inlet air. Moreover the air supplied to the gasifier does not expand in the turbine and does not perform any mechanical work.

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