Client parameters for a specific heater will determine its final design, capacity, and characteristics, and with most critical fired-heater installations. However, the following fundamental precepts are reflected in the process design of every vacuum heater from OnQuest or Born Canada:
Heat Transfer - Uniformity of heat transfer to each parallel pass.
Tube Arrangement - Parallel passes are situated so as to obtain uniform heat transfer to each pass. We can effect a crossover arrangement where the process flow in one pass will jump several tubes in the adjacent pass, thereby locating similar tube coil joints in the same relative position in multi-pass coil arrangement.
Radiant Heat Transfer Rates - Conventionally, depending on tube coil configuration, we target average radiant rates from 8,000 to 12,000 BTU/hr. ft2. Double firing would lift the rate to approximately 15,000 BTU/hr. ft2.
Temperature, Pressure, & Vaporization - In-tube process conditions of temperature, pressure, and vaporization are critical design parameters; proper flash vaporization data and enthalpy data are mandatory for proper design. The entire in-tube profile for every heater we design is simulated and modeled on our in-house software.
