Steady state CFD analysis of heat transfer coefficient in pressurised pipes of super-heater of OP210 steam boiler

Granda, Mariusz

doi:10.1051/matecconf/201824005008

Cited by 5 publications

(2 citation statements)

References 6 publications

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“…In terms of that and at the basis of the fluid mechanic and finite volume method theory, discretization of the boundary layer should be prepared properly. In this case, only fully turbulent flow occurs, so the most important is dimensionless y+ parameter that is very useful for velocity profile description [3,4,5]. Another important criterion is the mesh quality, where poor mesh orthogonality has enough influence, to make solution of the simulation distant from the reality [6].…”

Section: Steady State Analysismentioning

confidence: 99%

CFD analysis of steam superheater, transient state

2019

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Nowadays, industry requirements referring to the optimization, not only demand better efficiency ordurability but also the lower total cost of the project. Maximum temperatures, allowablestress and economics determine materials used during the engineering process. Moreover, different materials in different parts of superheater can be used. Regarding the steady–state, calculations can be derived without major difficulties but transient–state is a much more complex issue, where Computational Fluid Dynamics can be applied. CFD as an engineering tool, that gives a better understanding of the problem, is more and more popular during the optimization process. Appropriate knowledge about heat transfer, fluid dynamics, finite element method is required to find the solution to the given question. The paper presents a CFD analysis of the transient-state of the steam boiler superheater when attemperator is running. Temperature distribution of the steam, flue gas and maximum wall temperature were determined.

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Section: Steady State Analysismentioning

confidence: 99%

CFD analysis of steam superheater, transient state

2019

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“…The subsequent phase of the research involved creating an appropriate mesh. The relevant boundary layer was established, with the dimensionless parameter 'y + ' equating to one [33]. Discretization is imperative due to the significant impact of discretization errors on the simulation outcomes.…”

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confidence: 99%

Analysis of the Causes of the Emergency Shutdown of Natural Gas-Fired Water Peak Boilers at the Large Municipal Combined Heat and Power Plant

Trojan,

Dzierwa,

Taler

et al. 2023

Energies

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The paper presents a cause-and-effect analysis of the failure of a 130 MWt gas-fired water boiler. The fault was a rupture of the helically finned tubes in the first rows of the second-stage water heater (ECO2). The high frequency of failures forced the boiler user to investigate their causes. The rapid drop in water flow in the ECO2 and the tightly finned pipes suggested that the permissible operating temperature of the steel used was exceeded. The only possible way to assess the working conditions was through a CFD simulation of the operation of the ECO2. Validated with the data acquisition system, the results show that the main reason for the failure was the overheating of the first rows of finned water heater pipes, regardless of the boiler load. The high heat flux value, exceeding 500,000 W/m2, and the increased flue gas temperature in front of the ECO2, almost reaching 900 °C, affected the appearance of the boiling film, limiting the cooling of the tube wall. Heat radiation and eddies behind the tubes significantly impacted the non-uniform temperature distribution, resulting in high pipe wall stress. By analyzing the service life of the first row of pipes based on the Larson–Miller parameter, it was concluded that the pipes would fail after only a few tens of hours.

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