Guspro BB-8416884 - 4.0 - OPERATION; 4.1 Introduction; 4.1.1 Process Chamber; 4.1.2 High Combustible Loads

2017_E_TYPE-HL.doc Page 25 of 55 24-Oct-2017
4.0 - OPERATION
4.1 Introduction
As explained in previous sections, the Guspro Heat Cleaning Oven includes a process
chamber, an integral thermal oxidizer, temperature controls for burners and air supply, and a
water mist injection system. Both the process and oxidizer temperature controllers control the
water mist injection system.
During operation, the oven is first purged with air corresponding to four times the total
volume of the process chamber, oxidizer chamber and the stack. The oxidizer burner is then
fired and the chamber is preheated up to 1400 degrees Fahrenheit before the process chamber
burner fires.
The process and oxidizer burners switch between high and low fire to maintain the
chamber temperatures at their set points.
4.1.1 Process Chamber
The process chamber is designed to strip coatings/contaminants from metal parts. This is
accomplished by volatilizing the load gradually. As temperature in the process chamber reaches
the flash point, volatilization of the load increases.
As the volatile particles ignite, a rapid rise in process chamber temperature occurs. Thus,
the process chamber controller automatically cycles the process chamber burner to low fire. If
the process chamber continues to rise, the OTS misting system is activated.
When the temperature in the process chamber drops below set point, the burner will cycle
to high fire again to maintain a uniform processing temperature. The OTS is activated only
when temperatures continue to rise after burner chamber and excess temperature set points are
reached. This allows for minimal fuel and water consumption while offering complete load and
temperature control.
As airflow in the process chamber is very low, velocities across the load are very low and
little ash, if any, is entrained and carried to the stack.
4.1.2 High Combustible Loads
Some coatings contain bound oxygen atoms as part of their chemical structure. As these
coatings are decomposed by heat, the released oxygen ignites rapidly causing a rampant