Circulation Heater Acts As Duct Heater To Raise Chemical Gas To Correct Process Temperature
Circulation Heater Acts As Duct Heater To Raise Chemical Gas To Correct Process Temperature
2 PagesCirculation Heater Acts As Duct Heater To Raise Chemical Gas To Correct Process Temperature Problem: A chemical process was to heat 1211 lbs/hour (510 kg/hour) of air to produce an outlet temperature of 1056°F (570°C) and pressure of 1.8 psig (0.26 kPa) from an ambient inlet temperature of 100°F (35°C) at standard atmospheric pressure. The process could only withstand a maximum allowable pressure drop of 1.5 psi (0.22 kPa) across the heating element bundles. These specifications made by the customer for an 8-inch (20 cm) flange heater having a maximum sheath temperature of 1300°F (705°C) and a maximum allowable watt density of 3.5 and 8 W/in2 (0.5 to 1.2 W/cm2). Solution: The high outlet temperature necessitated using three heaters in series. The first of which was a 60 kilowatt heater of
