Thermal Characteristics of Tube Bundles in Ultra-Supercritical Boilers

Choi, Seok Min; Park, Jun Su; Sohn, Hong Gyoo; Kim, Seon Ho; Cho, Hyung Hee

doi:10.3390/en9100779

Cited by 5 publications

(3 citation statements)

References 32 publications

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“…The effect of temperature alone is most often considered in relation to the assessment of the allowable service life for membrane wall tubes, drums or headers, taking into account phenomena such as material overheating [6] or creep [4,7,8]. Most of the works presented in the literature consist in investigations and analyses of damaged pipes, headers or drums, i.e., pressure parts [6,7,[9][10][11]. However, damage resulting in leaks in the boiler also affects non-pressure elements of the facility, such as membrane wall fins [12,13].…”

Section: Introductionmentioning

confidence: 99%

Negative Impact of Thermal Loads on Pressure and Non-Pressure Boiler Parts

Duda

Felkowski

2023

Energies

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Issues related to the proper design of power boiler elements taking account of thermal loads are still relevant in this era of increasing variability of the boiler power output over time. The aim of this work is to present a thermal and strength analysis for a section of the membrane wall of a steam boiler, designed and manufactured in compliance with international standards, and approved for operation by a pressure equipment supervisory authority. Although the procedures were followed as required, the boiler membrane wall became cyclically damaged. The cause of such periodic damage to the boiler can be explained based on the conducted analyses.

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Section: Introductionmentioning

confidence: 99%

Negative Impact of Thermal Loads on Pressure and Non-Pressure Boiler Parts

Duda

Felkowski

2023

Energies

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“…Increasing steam parameters (pressure and temperature) of utility boilers can effectively improve fossil energy utilization to reduce pollutant emissions [1,2]. The application of ultra-supercritical technology puts higher requirements on the steam oxidation resistance of high temperature heating surface materials [3,4].…”

Section: Introductionmentioning

confidence: 99%

Investigation on Oxidation Behavior of Super304H and HR3C Steel in High Temperature Steam from a 1000 MW Ultra-Supercritical Coal-Fired Boiler

Wang

et al. 2019

Energies

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Oxidation behavior of Super304H and HR3C steel in high temperature steam from an ultra-supercritical coal-fired boiler was investigated in this paper. The results showed that the steam oxidized surface of Super304H ware composed of Fe2O3, Cr2O3 and FeCr2O4, the oxide scale had a thickness of 50–70 μm. In addition, the steam oxidized surface of HR3C ware composed of Fe2O3, the oxide scale was about 20μm in thickness and contained few pitting. The oxidation product layer of the two samples could be divided into two layers, including outer layer enriched O element and Fe element, and inner layer enriched O element and Cr element. Furthermore, oxide scale spalling was observed on the surface of Super304H sample.

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“…However, most power plants use the Ljungstrom type GGH than Rothemuhle type GGH, considering the installation cost and operational efficiency [4]. To exchange heat, the Ljungstrom type GGH transfers the untreated and treated gases through separate ducts and through the rotor [5]. To increase the efficiency of heat exchange, a corrugated heating element is inserted, as shown in Figure 1b.…”

Section: Introductionmentioning

confidence: 99%

Optimization of the Heating Element in a Gas-Gas Heater Using an Integrated Analysis Model

et al. 2017

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Gas-gas heaters (GGHs) are used to reheat gases through desulfurization in coal-fired power plants to reduce low-temperature corrosion and white smoke. Wrinkled heating elements are installed inside the GGH to perform effective heat exchange. An optimization study of the heating element shape was conducted to reduce the differential pressure effectively and improve performance. An integrated analysis model was applied. Based on actual operational data, a computational fluid dynamic analysis was conducted on the L-type heating element and GGH system. The experiments applied the optimal latin hypercube sampling method, and numerical analysis was performed for each sample. Based on the response surface, the result of the sample was optimized through the pointer algorithm. For the integrated analysis model, validation was performed by comparison with the actual operational data, and the thermal-fluid characteristics of the heating element and GGH system were analyzed to set three parameters: plate angle, undulated angle, and pitch 1. From the optimization result, increases in the undulated angle and pitch 1 reduce the pressure drop by widening the heating element cross section. By increasing the plate angle, the heat transfer area is secured and the reduced heat transfer coefficient is compensated, improving the GGH performance.

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Thermal Characteristics of Tube Bundles in Ultra-Supercritical Boilers

Cited by 5 publications

References 32 publications

Negative Impact of Thermal Loads on Pressure and Non-Pressure Boiler Parts

Negative Impact of Thermal Loads on Pressure and Non-Pressure Boiler Parts

Investigation on Oxidation Behavior of Super304H and HR3C Steel in High Temperature Steam from a 1000 MW Ultra-Supercritical Coal-Fired Boiler

Optimization of the Heating Element in a Gas-Gas Heater Using an Integrated Analysis Model

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