Eclipse TFB030 Manual

Also see for TFB030: Installation guide

Contents

Eclipse TFB030 Manual Manual pdf 10 page image

10 Eclipse TFB, V2, Design Guide 310, 11/14/2014Tube Design1. Elbowsa.We recommend the use of standard and sweepelbows only.b.The first elbow should be at least eight tubediameters from the face of the burner.2. Stacka.Make sure that the stack is large enough to handlethe exhaust flow plus the dilution air.b.The stack must be at least one pipe size larger thanthe tube exhaust.NOTE: Detailed guidelines for flue sizing calculations arein the Eclipse Combustion Engineering Guide (EFE 825).3. Draft breaking hoodFigure 3.8.A draft breaking hood is an open connection between theheater tube exhaust and the exhaust stack. It allows freshdilution air to pass into the exhaust and mix with theexhaust gases.The advantages of a draft hood are:• the burner operation is less sensitive to atmosphericconditions• the temperature of the exhaust gases is lower whenthey pass through the roof.NOTE: Make sure that it is possible to get accessbetween the draft hood and the tube exhaust. Then youcan install a damper plate if acoustic feedback occurs inthe tube.Step 2: Control MethodologyThe control methodology is the basis for the rest of thedesign process. Once you know what your system willlook like, you can select the individual components. Whichcontrol methodology you choose depends on the type ofprocess that you want to control.Control MethodsThere are two main methods to control the input of a TFBsystem:1. Modulating controlA burner system with modulating control gives aninput that is in proportion with the demands of theprocess. Any input between high and low fire ispossible. The burner operates at 15% excess air athigh fire, and 100% excess air (min.) at low fire.2. High/low controlA system with high/low control gives a high or low fireinput to the process. No input between high and lowfire is possible. The burner operates at 15% excessair at high fire, and 100% excess air (min.) at low fire.The only difference in the components is the type ofactuator on the automatic butterfly valve (controlvalve , page 11).On the next page you will find schematics of thesecontrol methods. The symbols in the schematics areexplained in the Appendix on page ii.Automatic gas shut-off by burner (optional)As an option, an automatic gas shut-off valve can beinstalled. If the flame monitoring system detects a failure,the gas shutoff valve closes, interrupting the gas supply tothe burner that caused the failure.System schematics1. AirThe control valve  is in the air line. It sets the air flowto the required value.2. GasThe ratio regulator  allows the required amount ofgas to go to the burner. Low fire gas is limited by ratioregulator . High fire gas is limited by the manualbutterfly valve .StackTube exhaustDilution airDraft breakinghood