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Simulation of Enhancing Heat Transfer on Waste Heat Boiler of the Incinerator and Analysis of Its Slagging and Fouling

Author: GaoYang
Tutor: YinHongChao
School: Dalian University of Technology
Course: Thermal Power Engineering
Keywords: Waste heat boiler Enhancing heat transfer Numerical simulation Slagging Spiral tube Comprehensive income Criteria Condensation
CLC: TK124
Type: Master's thesis
Year: 2008
Downloads: 257
Quote: 7
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Abstract


China is a big nation in terms of energy production and consumption. With rapid development of the economic, the total energy consumption has increased speedily year by year, as well as Urban sewage and industrial waste water production has also increased sharply. The incineration widely used is an economical, efficient and environmentally harmonious measure. However, waste heat recovery of the burning product has become a major engineering challenge.In this paper, a waste heat boiler of waste incinerator of a real project has been analyzing and studying, the actual crux of the matter is to enhance heat transfer and settle the slagging problems. With the combination of theory and related knowledge in the field of research methods and the direction, the practical problems are simplified to apply fluent software to numerical simulation. The complex problem is divided into two parts to carry out numerical simulation. In order to strengthen heat transfer, heat transfer and dynamic characteristics of the spiral tube and tube are comprised, and an optimization model to adjust the pitch of heat transfer pipe for enhancing heat transfer is set up. In addition, a more detailed analysis in the aspects of heat transferring, pressure drop on the tailgate-for-tube is made. The actual problem that the velocity is selected led to a comprehensive consideration of the characteristics of heat transfer and resistance to determine the velocity—Comprehensive income Criteria is made reference to the guidelines of the velocity, which would be widely referred in an actual projects (the limited velocity and the optimal velocity), which has also been widely discussed in depth.Finally, to attempt to numerically simulate deposition process, through the current understanding of the phenomenon of the deposition, what is realized that only that a fairly complete process of condensation was simulated; the simulation of the deposition process could be more realistic. So water vapor condensation between parallel plates in a horizontal miniature channels is tried to conduct by using Volume of Fluid (VOF) method as the start of the simulation of the deposition process. The comparison of condensation with gravity and without gravity has been made to analyze the effects of gravity on film thickness and heat transfer, and heat transfer was compared with no condensation. In addition, non-steady-state simulation of the condensation show out the two-phase flow pattern change with heat transfer, and shortcomings in the simulated process are summed up, as well as the developing direction in the field in future, which have a good reference value on strengthening understanding condensation and lay a foundation in the further development of condensation model. It also do a good job in paving the way for more complex simulation of the condensation slag process with physical and chemical reactions.

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CLC: > Industrial Technology > Energy and Power Engineering > Thermal engineering, heat > Thermal Engineering Theory > Heat Transfer
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