Water spray cooling of gas turbine cycles

Ritchey, I.; Fisher, E H; Agnew, Gerry

doi:10.1243/0957650001538308

Cited by 5 publications

(4 citation statements)

References 15 publications

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“…The pressure ratio for the cycle is defined as (24) In general, the thermal efficiency of the cycle may be determined from (25) The second-law analysis is a powerful tool in the design, optimization, and performance evaluation of energy systems. The general principles and methodology of second-law analysis may be found in Moran [27], Bejan [28], and Gaggioli [29].…”

Section: The First and Second-law Analysis Of The Cyclementioning

confidence: 99%

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Thermodynamic Evaluation of First and Second Law Performance of Evaporative Cooling Schemes for Regenerative Gas Turbines

Bolattürk

Kanoğlu

Coskun

2007

Energy Exploration & Exploitation

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In this study, effect of evaporative cooling on performance of regenerative gas turbine cycle is investigated considering simple regenerative cycle and regenerative cycle with intercooling and reheating. Evaporative cooling is applied to inlet air in simple regenerative cycle while it is applied to compressor inlet air and air between the compressor stages in reheat regenerative cycle. The first and second law performances of the cycles incorporating evaporative cooling are compared to the corresponding conventional cycles. Effects of the temperature and relative humidity of the ambient air, the turbine inlet temperature, and the pressure ratio on the net work, the thermal efficiency, and the second-law efficiency of the cycles are investigated. It appears that evaporative cooling increases thermal efficiency, net work, and optimum pressure ratio. With respect to simple regenerative cycle at a turbine inlet temperature of 1400 K and at a pressure ratio of 20, the thermal efficiency and the net work increase by 1.5 percent and 4 percent, respectively by inlet cooling in simple regenerative cycle while they increase by 18.3 percent and 12.2 percent, respectively by inlet cooling and intercooling in reheat regenerative cycle. With respect to conventional regenerative cycle with intercooling and reheating, evaporative cooling applied to inlet air and for intercooling provides essentially no increase in thermal and second-law efficiencies while it increases the net work 8.2 percent to 17.8 percent depending on the ambient conditions. Increasing turbine inlet temperature gives a linear increase in the optimum pressure ratio. As the ambient temperature increases and the relative humidity decreases, evaporative cooling becomes more effective in improving cycle performance.

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Section: The First and Second-law Analysis Of The Cyclementioning

confidence: 99%

“…al. [24] reported that spray intercooling can give a greater power boost than conventional intercooling for a given compressor operating envelope and spray inlet chilling can give performance benefits comparable with absorption chilling.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Evaluation of First and Second Law Performance of Evaporative Cooling Schemes for Regenerative Gas Turbines

Bolattürk

Kanoğlu

Coskun

2007

Energy Exploration & Exploitation

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“…Many studies have shown that the spray evaporation cooling process can be analyzed by numerical simulation. Ritchey et al [4] constructed a numerical simulation calculation framework for the inlet spray cooling technology. Within a given range of compressor operation, spray intermediate cooling can provide greater power gain than traditional intermediate cooling, and spray inlet cooling can provide performance advantages comparable to those of absorption refrigeration cooling.…”

Section: Introductionmentioning

confidence: 99%

Simulation on Evaporation and Cooling Characteristics of Spray System

Chang,

Wang,

Wang

et al. 2023

J. Phys.: Conf. Ser.

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This study explored the evaporation and cooling characteristics of air pipeline spray based on computational fluid dynamics method. A geometric model of the pipeline air spray was constructed and meshed, and the Euler-Lagrange research method of the discrete phase model (DPM) was used to study the evaporation and cooling characteristics of the spray system. It was found that the length required for complete evaporation of droplets increased with the relative humidity. When the inlet temperature was 308K and the relative humidity was 40%, the evaporation length increased by 43.71% compared to when it was 20%. There was a negative correlation between the inlet temperature and the evaporation length, and when the relative humidity was 30%, the evaporation length at an inlet temperature of 323K decreased by 1.55m compared to when it was 313K. After spraying, the air temperature gradually decreased along the length of the pipe, and the cooling effect decreased as the relative humidity of the inlet air increased. When the inlet temperature was 308K and the relative humidity was 40%, the outlet temperature was 4.39K higher than when it was 20%, and the cooling effect increased as the inlet air temperature increased. When the relative humidity of the inlet air was 30%, the temperature drop at the outlet at an inlet temperature of 323K was 1.93K higher than when it was 313K.

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“…Examples of the work include spray cooling in gas turbines [4,5], spray applications in incineration processes [6], fire fighting [7], spray forming [8,9] and spray drying [1,2]. However, there is sparse CFD modelling investigation dealing with spray cooling of the hot gas.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nozzle Location and Nozzle Capacity on Spray Cooling of Hot Gas in a Horizontal Duct

Xia¹,

Järvi²,

Nurminen³

et al. 2007

Canadian Metallurgical Quarterly

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The modeling of the spray cooling of hot gas in a horizontal duct is carried out. Three nozzle arrangements are considered: the nozzle is located at the duct wall with the injection in favour of and against gravity (cross flows) and at the central axis (parallel flow). The predicted flow and heat transfer performance between different nozzle arrangements are compared for various nozzle capacities and numerical predictions are verified with simplified analytical solutions of outlet temperature. Results show that some non-vaporized droplets flow out of the duct exit. As far as the cooling effect is concerned, the cross flow with the injection against gravity is the best and the parallel flow appears to be the worst. For a given nozzle capacity, the operation may be more stable (with less flow and thermal fields fluctuation in quasi-steady state) and fewer droplets hit the duct wall for the nozzle arrangement with the injection against gravity. For safe operation, the nozzle should be located about 9 to 10 m ahead of the equipment.Résumé -On effectue la modélisation du refroidissement par aspersion de gaz chaud dans un conduit horizontal. On considère trois arrangements de la buse: la buse est située à la paroi du conduit avec l'injection en faveur de, ou contre, la gravité (écoulements croisés) et à l'axe central (écoulements parallèles). On compare le rendement prédit du transfert d'écoulement et de chaleur entre les différents arrangements de la buse pour des débits variés de la buse. Les prédictions numériques sont vérifiées avec des solutions analytiques simplifiées de la température de sortie. Les résultats montrent que quelques gouttelettes non vaporisées s'écoulent à la sortie du conduit. En ce qui a trait à l'effet de refroidissement, l'écoulement croisé avec l'injection contre la gravité est le meilleur et l'écoulement parallèle semble le pire. Pour un débit donné de la buse, l'opération pourrait être plus stable (avec moins de fluctuation de l'écoulement et des champs thermiques dans un état quasi-stationnaire) et moins de gouttelettes frappent la paroi du conduit pour l'arrangement de la buse avec l'injection contre la gravité. Pour un fonctionnement sûr, on devrait positionner la buse à environ 9 à 10 m en avant de l'équipement.

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Water spray cooling of gas turbine cycles

Cited by 5 publications

References 15 publications

Thermodynamic Evaluation of First and Second Law Performance of Evaporative Cooling Schemes for Regenerative Gas Turbines

Thermodynamic Evaluation of First and Second Law Performance of Evaporative Cooling Schemes for Regenerative Gas Turbines

Simulation on Evaporation and Cooling Characteristics of Spray System

Effect of Nozzle Location and Nozzle Capacity on Spray Cooling of Hot Gas in a Horizontal Duct

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