On the Efficiency of Heat and Electric Power Plants Based on Combined-Cycle Plants with Overexpansion of the Working Fluid in the Gas Turbine and Injection of Steam into the Gas Path

Шапошников, В. В.; Biryukov, B. V.

doi:10.1007/s10556-018-0445-8

Cited by 8 publications

(2 citation statements)

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“…Humidified gas turbines have been seen, for a long time, as technology with great potential for high efficiency energy production, especially combined with other technologies in cogeneration and district heating or technological solutions such as water or steam recovering from exhaust gas or CO 2 removal [18]. Steam-based gas turbine cycles have been employed over the years [19,20], especially for Combined Heat and Power (CHP) [21]. Humidification and steam reforming have also been used simultaneously [22,23], under various compressor stages [24], and under a great variety of conditions.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Novel Humified Gas Turbine Cycle Parameters for Ammonia/Hydrogen Fuels

Božo¹,

Valera‐Medina

2020

Energies

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Carbon emissions reduction via the increase of sustainable energy sources in need of storage defines chemicals such as ammonia as one of the promising solutions for reliable power decarbonisation. However, the implementation of ammonia for fuelling purposes in gas turbines for industry and energy production is challenging when compared to current gas turbines fuelled with methane. One major concern is the efficiency of such systems, as this has direct implications in the profitability of these power schemes. Previous works performed around parameters prediction of standard gas turbine cycles showed that the implementation of ammonia/hydrogen as a fuel for gas turbines presents very limited overall efficiencies. Therefore, this paper covers a new approach of parameters prediction consisting of series of analytical and numerical studies used to determine emissions and efficiencies of a redesigned Brayton cycle fuelled with humidified ammonia/hydrogen blends. The combustion analysis was done using CHEMKIN‐PRO (ANSYS, Canonsburg, PA, USA), and the results were used for determination of the combustion efficiency. Chemical kinetic results denote the production of very low NOx as a consequence of the recombination of species in a post combustion zone, thus delivering atmospheres with 99.2% vol. clean products. Further corrections to the cycle (i.e., compressor and turbine size) followed, indicating that the use of humidified ammonia-hydrogen blends with a total the amount of fuel added of 10.45 MW can produce total plant efficiencies ~34%. Values of the gas turbine cycle inlet parameters were varied and tested in order to determine sensibilities to these modifications, allowing changes of the analysed outlet parameters below 5%. The best results were used as inputs to determine the final efficiency of an improved Brayton cycle fuelled with humidified ammonia/hydrogen, reaching values up to 43.3% efficiency. It was notorious that humidification at the injector was irrelevant due to the high water production (up to 39.9%) at the combustion chamber, whilst further research is recommended to employ the unburned ammonia (0.6% vol. concentration) for the reduction of NOx left in the system (~10 ppm).

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Section: Introductionmentioning

confidence: 99%

Prediction of Novel Humified Gas Turbine Cycle Parameters for Ammonia/Hydrogen Fuels

Božo¹,

Valera‐Medina

2020

Energies

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“…Nowadays there are many approaches to get an energy. In might be conventional ways, for example, traditional thermal power plants with a huge steam turbine and boilers [1,2]. Also now getting wide spread using of renewable energy sources -solar, soil, wind energy -these installations appear all around the world [3][4][5].…”

Section: Introduction and Problem Definitionmentioning

confidence: 99%

Waste Co-Combustion with a Conventional Fossil Fuel on Power Plants

et al. 2020

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The paper has to shed light into understanding the waste useful and it has an aim to review about possibilities how to using different types of waste to generate energy. The paper highlighted the terms, that renewables it isn’t energy of the future but waste is – at least the future for the next hundred years. It’s very important to use waste by the right way, because of some current methods waste using have a low efficiency. There are several ways of using waste with pretreatment. Nowadays pretreatment includes torrefaction, pelletization, torrefaction of pellets (TOP) and wide spread around the world. It is necessary to compare economic indicators when you want to using some scenario. Using of waste can help us to reduce the pollutions and decrease load to an ambient. There are some advantages to using organic waste to generate energy – it can be considered as a fuel. But it also consists some negatives aspects such as low efficiency due to low thermal values (i.e. specific thermal capacity). Hence, waste using not so unequivocally as it seems at first sight. Thus, here is our understanding for this problem.

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