Thermal and flow characteristics of a cylindrical superheater with circular fins

Bang, You-Ma; Park, Seung Ryong; Cho, Chong Pyo; Cho, Minjung; Park, Sungwook

doi:10.1016/j.applthermaleng.2020.115895

Cited by 9 publications

(4 citation statements)

References 21 publications

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“…The saturated steam enters the HTSG inlet and is passed with a swirl as shown in Figure 3. This is a key technology capable of generating high‐temperature steam in the HTSG system 14 . The HTSG inlet angle is set 5° and the steam flows in a swirl to increase effective heat transfer area.…”

Section: Methodsmentioning

confidence: 99%

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Study on highly efficient high‐temperature steam harvesting using waste energy

Kim

Cho

et al. 2021

Intl J of Energy Research

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In this study, a high-temperature steam generator (HTSG) of cyclone cylindrical type has been developed for energy harvesting applications. Solid refuse fuel (SRF) is considered the thermal energy source. The operating conditions are steam temperature of 773 K, steam pressure of 0.3 to 0.6 MPa, and mass flow rate of 10 to 35 kg/h. The pressure drop of steam in the HTSG is analyzed through numerical methods, which can control the outlet pressure of steam for hydrogen stack application based on the experimental results. The maximum heat transfer efficiency of the HTSG system is 66% at 0.3 MP and 35 kg/ h, which can generate 306 tons per year of high-temperature steam. Moreover, the produced steam can be converted to 15.3 tons of hydrogen. The HTSG system can harvest 767 MWh of energy per year, and it is expected to significantly reduce energy consumption while minimizing the environmental impact.

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Section: Methodsmentioning

confidence: 99%

“…This is a key technology capable of generating hightemperature steam in the HTSG system. 14 The HTSG inlet angle is set 5 and the steam flows in a swirl to increase effective heat transfer area. Depending on the inlet angle, the steam flow has different directions, as presented in Figure 4.…”

Section: Experimental Apparatusmentioning

confidence: 99%

Study on highly efficient high‐temperature steam harvesting using waste energy

Kim

Cho

et al. 2021

Intl J of Energy Research

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“…Via contrasting the computed results with the CFD findings, the correctness of the novel approach was established. Bang et al [19] studied the flow resistance and heat transfer properties of a superheater in the boiler and explored the influence of circular fins with different curvature angles on the Nusselt number (Nu), pressure drop, and steam temperature. Laubscher et al [20][21][22] studied the platen superheater in a 620 MW boiler.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Heat Transfer and Flow Resistance Characteristics of Superheater in Hydrocracking Heat Recovery Steam Generator

Zhang,

Wang,

Zhao

et al. 2023

Energies

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The heat recovery steam generator (HRSG) was utilized to recover the waste heat resources of the catalyst’s regenerated gas with the objective to reduce the energy consumption of the hydrocracking process. In this study, the flow resistance and heat transfer performance of the superheater tube bundles in the hydrocracking HRSG were investigated via numerical simulation. The performance evaluation criterion (PEC1) was applied to characterize the comprehensive heat transfer performance of superheater tube bundles. The results showed that as the transverse tube pitch increased, the Nusselt number (Nu) showed a monotonically increasing trend, the Euler number (Eu) showed a monotonically decreasing trend, and PEC1 showed a monotonically increasing trend. As the longitudinal tube pitch increased, Nu exhibited a monotonically increasing trend, Eu showed a monotonically decreasing trend, and PEC1 showed a monotonically increasing trend. In the scope of the simulated results, as the transverse and longitudinal tube pitches were 110 mm and 95 mm, respectively, PEC1 reached the maximum value. Compared with the primary structural parameters, PEC1 increased by 2.32% and 8.50%, respectively. Finally, a new correlation was proposed to predict Nu and Eu of the superheater tube bundles in the hydrocracking HRSG.

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“…Although limited when it comes to condensation hoods, the literature describes profusely the unit processes regarding other applications and appliances. The most important phenomena in terms of the condensation efficiency are: the model of condensation of the air-steam mixture coupled with the species transportation process [4][5][6][7][8], the heat transfer in externally-finned pipes with plain circular fins [9][10][11][12][13][14], and also tube bundle configuration analysis [15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Development of a Condensation Model and a New Design of a Condensation Hood—Numerical and Experimental Study

et al. 2021

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The development of a numerical model and design for the innovative construction of a heat exchanger (HE) used in a condensation hood (being a part of the combi-steamer) are described in this work. The model covers an air-steam flow, heat transfer, and a steam condensation process. The last two processes were implemented with the use of an in-house model introduced via User Defined Functions (UDF). As the condensate volume is negligible compared to the steam, the proposed model removes the condensate from the domain. This approach enabled the usage of a single-phase flow for both air and steam using a species transport model. As a consequence, a significant mesh and computation time reduction were achieved. The new heat exchanger is characterised by reorganised fluid flow and by externally finned pipes (contrary to the original construction, where internally finned pipes were used). This allowed a reduction in the number of the pipes from 48 to 5, which significantly simplifies construction and manufacturing process of the HE. The redesigned HE was tested in two cases: one simulating normal working conditions with a combi-steamer, the other with extremely high heat load. Measurement data showed that the numerical model predicted condensate mass flow rate (3.67 g/s computed and 3.56 g/s measured) and that the condensation capability increased at least by 15% when compared to the original HE design.

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Thermal and flow characteristics of a cylindrical superheater with circular fins

Cited by 9 publications

References 21 publications

Study on highly efficient high‐temperature steam harvesting using waste energy

Study on highly efficient high‐temperature steam harvesting using waste energy

Numerical Investigation on Heat Transfer and Flow Resistance Characteristics of Superheater in Hydrocracking Heat Recovery Steam Generator

Development of a Condensation Model and a New Design of a Condensation Hood—Numerical and Experimental Study

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