Comparative study on off-design characteristics of CHP based on GTCC under alternative operating strategy for gas turbine

Yang, Cheng; Huang, Zhifeng; Ma, Xiaoqian

doi:10.1016/j.energy.2017.12.145

Cited by 25 publications

(6 citation statements)

References 27 publications

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“…As far as turbine modeling is concerned, variety of researchers have employed various techniques like turbine performance maps [ 9 , 10 , 32 , 33 , 35 , 52 , 61 , 74 , 159 ], Stodola ellipse equation [ 7 , 12 , 66 , 71 , 73 , 90 , 121 , 160 , 161 , 162 ], choking equation [ 45 ], Flugel formula [ 40 , 163 , 164 , 165 , 166 , 167 , 168 ] and blade element method [ 45 , 73 , 75 , 111 ]. If turbine performance is not available, then the turbine off design model is designed by the choking equation.…”

Section: Transient Model Development Portfolio Of Igtsmentioning

confidence: 99%

Transient Behavior in Variable Geometry Industrial Gas Turbines: A Comprehensive Overview of Pertinent Modeling Techniques

Hashmi

Lemma

Ahsan

et al. 2021

Entropy

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Generally, industrial gas turbines (IGT) face transient behavior during start-up, load change, shutdown and variations in ambient conditions. These transient conditions shift engine thermal equilibrium from one steady state to another steady state. In turn, various aero-thermal and mechanical stresses are developed that are adverse for engine’s reliability, availability, and overall health. The transient behavior needs to be accurately predicted since it is highly related to low cycle fatigue and early failures, especially in the hot regions of the gas turbine. In the present paper, several critical aspects related to transient behavior and its modeling are reviewed and studied from the point of view of identifying potential research gaps within the context of fault detection and diagnostics (FDD) under dynamic conditions. Among the considered topics are, (i) general transient regimes and pertinent model formulation techniques, (ii) control mechanism for part-load operation, (iii) developing a database of variable geometry inlet guide vanes (VIGVs) and variable bleed valves (VBVs) schedules along with selection framework, and (iv) data compilation of shaft’s polar moment of inertia for different types of engine’s configurations. This comprehensive literature document, considering all the aspects of transient behavior and its associated modeling techniques will serve as an anchor point for the future researchers, gas turbine operators and design engineers for effective prognostics, FDD and predictive condition monitoring for variable geometry IGT.

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Section: Transient Model Development Portfolio Of Igtsmentioning

confidence: 99%

Transient Behavior in Variable Geometry Industrial Gas Turbines: A Comprehensive Overview of Pertinent Modeling Techniques

Hashmi

Lemma

Ahsan

et al. 2021

Entropy

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“…For the Class F gas turbines, about 20% load reduction can be achieved when the constant TIT principle is employed, while the power load of the units can vary within 40–100% when the constant TET principle is used. The constant TIT principle has higher efficiency than the other one because of the higher initial parameters, however, it results in an increase in TET as the load decreases due to the decreasing expansion ratio 7,8 . Normally, below the minimum load of the TIT principle, the TET principle or fuel‐only control is employed.…”

Section: Introductionmentioning

confidence: 99%

“…Normally, below the minimum load of the TIT principle, the TET principle or fuel‐only control is employed. The strategy of fuel‐only control is to vary the fuel mass flow and not involve air mass flow regulation, which is normally working when IGV has been fixed 8 . Therefore, when different operation strategies are applied for GT, the variation laws of thermodynamic parameters and system performance will be different under variable load conditions 9 .…”

Section: Introductionmentioning

confidence: 99%

“…The constant TIT principle has higher efficiency than the other one because of the higher initial parameters, however, it results in an increase in TET as the load decreases due to the decreasing expansion ratio. 7,8 Normally, below the minimum load of the TIT principle, the TET principle or fuel-only control is employed. The strategy of fuel-only control is to vary the fuel mass flow and not involve air mass flow regulation, which is normally working when IGV has been fixed.…”

Section: Introductionmentioning

confidence: 99%

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Environmental thermoeconomic performance analysis of gas turbine combined cycle under off‐design conditions

Wang

Duan

Zhang

2022

Energy Science & Engineering

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Although the gas turbine combined cycle (GTCC) system has better environmental performance, it still emits pollution gases such as CO 2 and NOx. It is reasonable and necessary to add the environmental cost to the power production cost of the GTCC system. Based on the structure theory of thermoeconomics, through the reasonable pricing of pollutants (considering the environmental costs of CO 2 and NOx emission), the system environmental thermoeconomic cost (ETC) model is developed in this study, which achieves absolute internalization of environmental costs. Taking GTCC with different gas turbine (GT) operation strategies as the research object, the influences of different operation strategies and environmental conditions on the GTCC system ETC are studied. The results of this study show that it is beneficial to maintain higher turbine inlet temperatures (T 3 ) and turbine outlet temperatures (T 4 ), thus ensuring better GTCC environmental thermoeconomic performance, and GTCC with the operation strategy (using inlet guide vane (IGV) control to maintain T 3 at the design value and then to keep T 4 at its maximum value (IGVT3-650-F) has the lowest ETC, which are 0.09429 $/ kW•h at 75% gas turbine load rate (GTLR) and 0.10079 $/kW•h at 50% GTLR, respectively; reducing the emission of pollutants can reduce the unit ETC; for the combustion chamber, as the pollutant generation component of GTCC unit, it is most affected by the environmental damage cost; reducing the inlet air temperature can improve the system environmental thermoeconomic performance.

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“…Trying to boost the performance forecast precision of gas turbines at different off-design conditions, a non-linear manifold performance acclimation technique was used through genetic algorithm procedure [14]. Off-design performance analysis of gas turbines with emissions as well as the off-design performance analysis of different gas turbine configurations have been investigated [15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Off-design performance analysis of gas turbines

Saturday¹,

Nweke²

2020

Global J. Eng. Tech. Adv.

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This work deals with the off-design performance analysis of gas turbines. Two gas turbine power stations in Rivers state, Nigeria were used as case studies. Ambient temperature-induced off-design calculations were carried out. This is because no gas turbine operates at its design point in the field and ambient temperature is one of the parameters that changes more frequently in gas turbine operation. Off-design performance models were developed to estimate the power output, thermal efficiency and the exhaust gas temperature at different ambient temperature values. Input data were obtained from the two gas turbine operations and engine adaptation results from previous researches. The power output and the thermal efficiency drops with increase in ambient temperature while the exhaust gas temperature increases with increase in ambient temperature. On the average, power output drops by 1.13 MW when ambient temperature increases by 10 •C for the first gas turbine power plant and the value obtained for the second gas turbine power plant which is smaller is 0.473 showing that the power drop is dependent on the power output of the plant. For the same range of ambient temperature increase, thermal efficiency drops by 0.637 % and 0.583 % respectively for the two power plants. Larger drop in power output as well as thermal efficiency occurs at the lower temperature values. The exhaust gas temperature increases with ambient temperature almost uniformly with average value of 1.29 K and 1.21 K respectively for 1•C increase in ambient temperature. The simulated results closely matched the results obtained from the field at different ambient temperatures. The results of this work will guide power plant operators in economic analysis by estimating the power output beforehand.

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Comparative study on off-design characteristics of CHP based on GTCC under alternative operating strategy for gas turbine

Cited by 25 publications

References 27 publications

Transient Behavior in Variable Geometry Industrial Gas Turbines: A Comprehensive Overview of Pertinent Modeling Techniques

Transient Behavior in Variable Geometry Industrial Gas Turbines: A Comprehensive Overview of Pertinent Modeling Techniques

Environmental thermoeconomic performance analysis of gas turbine combined cycle under off‐design conditions

Off-design performance analysis of gas turbines

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