Eclipse ThermJet Burners for Preheated Combustion Air - Power ...

Combustor MaterialThe combustor that you choose depends on the temperatureand the construction of the furnace. Each burner size comesin at least two materials (SiC is available on models up to0200TJPCA). Select material suitable for furnace and preheatedair temperature.The application temperature limits of the combustors can befound in ThermJet PCA Data Sheets 206-1 through 206-13The control methodology is the basis for the rest of the designprocess. Once it is known what the system will look like, thecomponents can be selected. The control methodology chosendepends on the type of process to be controlled. All methodsemploy a heat exchanger and eductor per zone.Step 2: Control MethodologyThere are four basic methods for preheated combustion airapplications. The methods depend on how furnace pressurecontrol and ratio control are applied:1.2.3.4.Furnace pressure control fixed at start up. Single diaphragmratio regulatorFurnace pressure control fixed at start up. Double diaphragmratio regulatorAutomatic furnace pressure control. Double diaphragmratio regulator.Automatic furnace pressure control. Electronic mass ratiocontrol.The recommended method to control the input of a ThermJetPCA burner system is modulating gas & air (on-ratio control orexcess air @ low fire). This method may be applied to singleburner as well as multiple burner systems:Note:The stated operational characteristics only apply if the describedcontrol circuits are followed. Use of different controlmethods will result in unknown operational performancecharacteristics. Use the control circuits contained within thissection or contact Eclipse for written, approved alternatives.10 Eclipse ThermJet PCA Design Guide No. 206, 3/5/07