Tubular reactor design—II A modified one dimensional model

✍ Scribed by M. Ahmed; R.W. Fahien

• Publisher: Elsevier Science
• Year: 1980
• Tongue: English
• Weight: 728 KB
• Volume: 35
• Category: Article
• ISSN: 0009-2509
• DOI: 10.1016/0009-2509(80)85077-9

✦ Synopsis

A modified one-dtmenslonal model (MODM) IS developed for tubular packed reactors with exothermlc reactions The radial temperature and conversion profiles are represented by equations whose parameters are functions of axial posItton The parameters depend upon the centerlme temperature and converslon, the mean temperature and conversion, and the converslon at the reactor wall These five vanables are represented m terms of five ordinary dlfferentlal equations which are solved simultaneously

The heat loss to the surroundings 1s determined from the temperature gradlent and the thermal conductlvlty at the pope wall The heat generatton due to reactlon IS obtamed from a cross-sectlonal average reactlon rate

The model IS used to simulate the oxldatton of sulfur dioxide and the oxidation of naphthalene to phthabcanhydnde Although the MODM requires about half the computer time requued for the two-dlmenslonal model, It was nevertheless found to yield results of comparable accuracy for both the systems The average values of converslon and temperature from the new model are also shown to be more accurate than those obtamed with the conventlonal one-dunenslonal model (CODM) Furthermore the new model also accurately predicts the heat loss at the wall and provides information on the hot spot temperature and location whereas the CODM does not