Gas-Fired Heating of Retorts. Laboratory Test of Slot-Jet Assembly. Topical Report, April 1989-January 1990

摘要

A prototype fluid bed retort furnace with an advanced Slot-Jet heating mantle was subjected to about 50 heat up/cool down cycles and about 400 hours of operation. The slot-jet heating mantle was not damaged in any way. Mantle-to-retort heat transfer coefficients were calculated from a heat balance. Heat transfer coefficient thus obtained were analyzed in detail. Simple plotting of the steady state coefficient against mantle gas velocity gave a weak linear correlation, with the coefficient increasing in proportion to mantle gas flow rate. More rigorous treatment of the data was required to account for the scatter in the first simple plot. Acceptable accounting for the scatter was made by treating the measured heat transfer coefficient as the sum of a radiation heat transfer coefficient and a convective heat transfer coefficient. Such treatment allowed for accounting for the multiple effects of gas velocity, gas temperature and annulus-to-retort temperature gradient.