New Concept of a Micro Gas Turbine Based Co-Generation Package for Performance Improvement in Practical Use

Mochizuki, Kenichiro; Shibata, Satoshi; Inoue, Umeo; Tsuchiya, Toshiaki; Sotouchi, Hiroko; Okamoto, Masanori

doi:10.1115/pwr2005-50364

Cited by 4 publications

(2 citation statements)

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“…On the experimental side, Mochizuki et al were the first to perform an experimental study on steam injection in an mGT cycle. They injected steam, externally generated using a gas boiler, with a steam/air ratio of up to 6 % in the recuperator inlet of a Capstone C60 (60 kW e ) showing that the efficiency increased by 3 to 4 % [10]. Additionally, they showed that, as expected, NO x emissions decreased (from 4.6 to 1.5 ppm) while a slight increase in CO emissions was reported [10].…”

Section: Introductionmentioning

confidence: 68%

“…They injected steam, externally generated using a gas boiler, with a steam/air ratio of up to 6 % in the recuperator inlet of a Capstone C60 (60 kW e ) showing that the efficiency increased by 3 to 4 % [10]. Additionally, they showed that, as expected, NO x emissions decreased (from 4.6 to 1.5 ppm) while a slight increase in CO emissions was reported [10]. Delattin et al also numerically studied the potential of auto-raised steam injection in the compressor outlet of a Turbec T100, showing that with a maximal injection of 3.3 % steam, the electrical efficiency increased by 5.1 % relative [3].…”

Section: Introductionmentioning

confidence: 99%

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Micro Gas Turbine Cycle Humidification for Increased Flexibility: Numerical and Experimental Validation of Different Steam Injection Models

Paepe

Rossi

Carrerro

et al. 2018

Journal of Engineering for Gas Turbines and Power

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With the current shift from centralized to more decentralized power production, new opportunities arise for small-scale combined heat and power (CHP) production units like micro gas turbines (mGTs). However, to fully embrace these opportunities, the current mGT technology has to become more flexible in terms of operation—decoupling the heat and power production in CHP mode—and in terms of fuel utilization—showing flexibility in the operation with different lower heating value (LHV) fuels. Cycle humidification, e.g., by performing steam injection, is a possible route to handle these problems. Current simulation models are able to correctly assess the impact of humidification on the cycle performance, but they fail to provide detailed information on the combustion process. To fully quantify the potential of cycle humidification, more advanced numerical models—preferably validated—are necessary. These models are not only capable of correctly predicting the cycle performance, but they can also handle the complex chemical kinetics in the combustion chamber. In this paper, we compared and validated such a model with a typical steady-state model of the steam injected mGT cycle based on the Turbec T100. The advanced one is an in-house MATLAB model, based on the NIST database for the characterization of the properties of the gaseous compounds with the combustion mechanisms embedded according to the Gri-MEch 3.0 library. The validation one was constructed using commercial software (Aspen Plus), using the more advance Redlich-Kwong-Soave (RKS)- Boston-Mathias(BM) property method and assuming complete combustion by using a Gibbs reactor. Both models were compared considering steam injection in the compressor outlet or in the combustion chamber, focusing only on the global cycle performance. Simulation results of the steam injection cycle fueled with natural gas and syngas showed some differences between the two presented models (e.g., 5.9% on average for the efficiency increase over the simulated steam injection rates at nominal power output for injection in the compressor outlet); however, the general trends that could be observed are consistent. Additionally, the numerical results of the injection in the compressor outlet were also validated with steam-injection experiments in a Turbec T100, indicating that the advanced MATLAB model overestimates the efficiency improvement by 25–45%. The results show the potential of simulating the humidified cycle using more advanced models; however, in future work, special attention should be paid to the experimental tuning of the model parameters in general and the recuperator performance in particular to allow correct assessment of the cycle performance.

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Section: Introductionmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 99%

Micro Gas Turbine Cycle Humidification for Increased Flexibility: Numerical and Experimental Validation of Different Steam Injection Models

Paepe

Rossi

Carrerro

et al. 2018

Journal of Engineering for Gas Turbines and Power

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Waste heat recovery optimization in micro gas turbine applications using advanced humidified gas turbine cycle concepts

et al. 2017

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Toward Higher Micro Gas Turbine Efficiency and Flexibility—Humidified Micro Gas Turbines: A Review

Paepe

Carrero

Bram

et al. 2018

Journal of Engineering for Gas Turbines and Power

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Micro gas turbines (mGTs) offer several advantages for small-scale combined heat and power (CHP) production compared to their main competitors, the internal combustion engines (ICEs), such as low vibration level, cleaner exhaust, and less maintenance. The major drawback is their lower electrical efficiency, which makes them economically less attractive and explains their low market penetration. Next to improving the efficiency of the components of the traditional recuperated mGT, shifting toward more innovative cycles may help enhancing the performance and the flexibility of mGTs. One interesting solution is the introduction of water in the mGT cycle—either as auto-raised steam or hot liquid—preheated with the waste heat from the exhaust gases. The so-called humidification of the mGT cycle has the potential of increasing the electrical performance and flexibility of the mGT, resulting in a higher profitability. However, despite the proven advantages of mGT humidification, only few of these engines have been experimentally tested and up to now, no cycle is commercially available. With this paper, we give a comprehensive review of the literature on research and development of humidified mGTs: we examine the effect of humidification both on the improvement of the cycle efficiency and flexibility and on the performance of the specific mGT components. Additionally, we will present the different possible layouts, both focusing on the numerical and experimental work. Finally, we pinpoint the technological challenges that need to be overcome for humidified mGTs to be viable. In conclusion, humidification of mGT cycles offers great potential for enhancing the cycle's electrical efficiency and flexibility, but further research is necessary to make the technology commercially available.

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New Concept of a Micro Gas Turbine Based Co-Generation Package for Performance Improvement in Practical Use

Cited by 4 publications

References 0 publications

Micro Gas Turbine Cycle Humidification for Increased Flexibility: Numerical and Experimental Validation of Different Steam Injection Models

Micro Gas Turbine Cycle Humidification for Increased Flexibility: Numerical and Experimental Validation of Different Steam Injection Models

Waste heat recovery optimization in micro gas turbine applications using advanced humidified gas turbine cycle concepts

Toward Higher Micro Gas Turbine Efficiency and Flexibility—Humidified Micro Gas Turbines: A Review

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