聚酯纖維製程中VOC焚化處理用觸媒之特性探討

Characterization of the Catalyst Used for VOC Incineration in Polyester Manufacturing

陳順文(shun-wen Chen)

指導教授 ： 林昇佃

元智大學/工程學院/化學工程與材料科學學系/碩士(2004年)

摘要

無資料

關鍵字

焚化 ； 觸媒 ； 有機氣體

並列摘要

ABSTRACT
Catalytic incineration is a commonly used VOC's（volatile organic compounds）abatement method in the chemical industry. It can convert 90% or higher VOCs emission from petrochemical plant.
In this study, catalytic incinerator built in 1996 on Chung-shing fiber plant is examined. The study contains three parts：（1）companing different kind of catalyst for the incinerator（2）studying the effect of operating condition and the reactive kinetics, and（3）examining the reason for the catalystic deactivation.
Three catalysts were compared in the incinerator. The result demonstrated that the Pt-Pd bimetallic catalyst can have superlative 98% VOC removal efficiency, The Pt catalyst is the next with a 96% removal efficiency and the Pd catalyst achieved only 89% removal efficiency. Considering the cost, the Pt is obviously the best choice for the incinerator.
The Pt-Pd catalyst was studied for above 3 year period. At a VOC inlet concentration above 6000ppm, the VOC conversions become lower with increase concentration. When the VOC inlet concentration is lower than 6000ppm, the VOC conversion already not to change with decrease concentration. In a GHSV（gas hourly space velocity）from 3158hr-1~4737hr-1, average conversion of 96% or higher can be achieved. However, a GHSV above 11494hr-1 may result in a more economic operation. The inlet temperature also affect the VOC removal efficiency, it must be higher 240℃that conversion can achieve 90% or higher. If the inlet temperature is higher than 290℃, the conversion did not change significantly with the inlet temperature. When the outlet temperature shot higher than 750℃, nearly 100% conversion was observed probably due to the thermal reaction by the overheated hearth. The kinetic behavior of the incinerator was studied by operating at a differential mode. The reaction order (n) according to the power rate law was found between 0.77~0.83, which increased slightly with increasing temperature. This fiber plant catalytic incinerator for VOCs abatement was found to follow the rate equation as -rA=8349exp(-9.33/RT)×P . Based on an adiabatic energy balance analysis, the estimated operating performance can predict the actual plant operation within a 10% or lower deviation.
Last but not the least, the Pt-Pd catalyst after three-year operation suffered a significant activity loss. The reason for the catalyst deactivation was found mainly due to sintering, though fouling by coke deposition may present.

並列關鍵字

Incineration ； catalyst ； VOC