Date

2016

Document Type

Thesis

Degree

Master of Science

Department

Mechanical Engineering

First Adviser

Oztekin, Alparslan

Abstract

A mercury detection system was built and tested to help assess the mercury absorption ability of synthetic disks, made of Kapton polyimide film, under simulated flue gas conditions at different temperature levels. These synthetic disks would be part of a continuous mercury monitoring system developed by UHV, Inc. and the Lehigh University Energy Research Center. Evaluation of the disks was based on mercury absorption efficiency, calculated from the difference in mercury concentration before and after placing the discs into the detection system. CFD simulations of the temperature field in the test chamber were performed to get an accurate value of the gas temperature at the disk positions. Curve fits for the relationship between mercury absorption efficiency and gas temperature was drawn. This would provide valuable information to be used in the manufacture of the synthetic disk for the UHV mercury analyzer. It was found that the synthetic disks have a better temperature performance in terms of mercury absorption capacity in plain nitrogen flow (60.5% at 150°F) than where the simulated flue gas contains 700 ppm NO, 350 ppm SO2, 12.5% CO2, 5% O2 and N2 balancing the mixture (36.37% at 150 ). Testing of the disks under simulated flue gas condition with 20% moisture was also performed at 150°F to simulate the conditions of flue gas after a Wet Flue Gas Desulfurization system. The results showed that flue gas humidity has very little impact on the mercury absorption efficiency of the synthetic disks at 150°F.

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