Date of Award
11-30-2018
Document Type
Thesis
Degree Name
Engineering, MSE
First Advisor
Kwangkook Jeong
Committee Members
Hideya Koizumi; Mohammad Abutayeh
Call Number
LD 251 .A566t 2018 A79
Abstract
Ash deposition is a real concern in the pulverized coal-fired power plants because it inhibits heat transfer in heat exchangers which ultimately reduces the power plant efficiency and causes material damage to them by corrosion or erosion. The objective of this study is to investigate the impact of fuel quality on ash deposition by combined effect of inertial impaction and thermophoresis, assimilating shedding factor for transient modeling in the low-temperature heat exchangers (Gas-to-Gas Heaters). Single tube method with finite cell division approach is implemented in MATLAB 2017a to solve the governing equations for predicting ash deposition rates. The Stokes based capture efficiency is used to predict inertial impaction while the thermal gradient is calculated to predict thermophoretic deposition. The modeling results showed that particles larger than 10 µm dominated deposition and a larger share of deposition came from inertial impaction. The case studies suggest that substandard fuel incited excessive deposition.
Rights Management
This work is licensed under a Creative Commons Attribution 4.0 International License.
Recommended Citation
Aryal, Sandeep, "Unsteady Modeling on Fly Ash Deposition in Full-Scale Gas-To-Gas Heaters for Ultrasupercritical Pulverized Coal-Fired Power Plant Applications" (2018). Student Theses and Dissertations. 473.
https://arch.astate.edu/all-etd/473
