Numerical Simulation of the Influence of Deposits on Heat Transfer Process in a Heat Recovery Steam Generator
Flue gas entrains a large number of ash particles which are composed of alkali substances into the heat recovery steam generator (HRSG).The deposition of particles on the tube surface of heat transfer can reduce the heat transfer efficiency significantly.In the present work,an EulerianLagrangian model based on Computational Fluid Dynamics (CFD) is implemented to simulation flue gas turbulent flow,heat transfer and the particle transport in the HRSG.Several User-Defined Functions (UDFs) are developed to predict the particle deposition/rebounding as well as the influence of physical properties and microstructure of deposits on the heat transfer process.The results show that only after one day deposition,the total heat transfer rate reduces 27.68% compared with the case no deposition.Furthermore,the total heat transfer rate reduces to only 238.74kW after 30 days of continuous operation without any slag removal manipulation.Both numerical simulation and field measurement identify that the deposits play an important role in the heat transfer in the HRSG.Especially,when the deposits cant be removed designedly according to the actual operating conditions,the HRSG experiences a noticeable decline in heat transfer efficiency due to continuous fouling and slagging on the tube surface.
Numerical simulation Heat transfer Particle deposition Deposits growth CFD
Lin Mu Hongchao Yin
School of Energy and Power Engineering, Dalian University of Technology, 116023, Dalian, China
国际会议
台湾
英文
1301-1305
2011-12-11（万方平台首次上网日期，不代表论文的发表时间）