Design Guide 110 11/11/2011 Eclipse RatioMatic Burners RM Series Version 5
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Table of Contents Introduction .............................................................................................. 4 Product Description....................................................................... 4 Audience ....................................................................................... 4 RatioMatic Documents .................................................................. 4 Purpose.........................................................................................
1 Introduction Product Description The RatioMatic is a nozzle-mix type burner designed for direct and indirect air heating and oven applications up to 1900°F (1040°C). The burner package includes a combustion air blower and an air:gas ratio regulator to fire over a wide gas turndown range at a controlled ratio.
2 Safety Introduction Capabilities This section is provided as a guide for the safe operation of the RatioMatic burner system. All involved personnel should read this section carefully before operating this system. Adjustment, maintenance and troubleshooting of the mechanical and the electrical parts of this system should be done by qualified personnel with good mechanical aptitude and experience with combustion equipment.
3 System Design Design Step 1: Burner Option Selection The design process is divided into the following steps: Step 1 describes how to select burner options to suit an application. Use the RatioMatic Price Lists and Datasheets, series 110 when following this selection process. 1.
Firing Position Fuel Supply • Vertical Down Firing (Available for RM0050 through RM0700) • Vertical Up Firing (Available for RM0050 through RM0700) • Horizontal Firing Burner Configuration Select the turndown required. The high turndown option includes a ratio regulator with bypass adjustment for lower inputs. Combustor Type & Material Select a combustor type based on the application. Low temperature applications use an alloy combustion tube.
• 90° stroke • continuous modulating or high/low modulating control • reversible direction of rotation • certain applications may require control motors with a limit switch or switches if: - the burner capacity is to be limited to fit an application - the chamber is to be fired with positive or negative pressure - the chamber pressure is outside the range -1" w.c. to +1" w.c.
Step 3: Control Methodology Process Controller Control Signal Control Motor Air BV Excess air Process Gas Pressure Impulse et ric Temperature Air St oi ch io m o ntr o c tio Ra Set Point n io at r pe lo Gas Flow Ratio Regulator Figure 3.6. Basic Control Loop Figure 3.4. Air : Gas Flow • The control motor modulates the air butterfly valve (BV) which controls the combustion air flow. • Air pressure in the burner body sends an impulse down the loading line to the ratio regulator.
The possibility exists where the low fire settings are insufficient to ignite the burner within the maximum trial for ignition time. The following options must be considered under these conditions: • start at higher gas input levels • resize and/or relocate the gas controls • use bypass start gas Ignition Gas Piping RatioMatic burners are capable of ignition with either low fire or bypass start gas. Flame rods are available on models RM0050 through RM0700 burners with alloy or SiC tubes.
Step 6: Main Gas Shut-Off Valve Train Component Selection Eclipse can help in the design of a main gas shut-off valve train that satisfies the customer and complies with all local safety standards and codes set by the authorities within that jurisdiction. Contact Eclipse for further information. NOTE: Eclipse supports NFPA regulations (two gas shutoff valves as a minimum standard for main gas shut-off systems).
Appendix Conversion Factors Metric to English From To Multiply By actual cubic meter/hr (am³/h) actual cubic foot/hr (acfh) 35.31 normal cubic meter/hr (Nm³/h) standard cubic foot /hr (scfh) 38.04 degrees Celsius (°C) degrees Fahrenheit (°F) (°C x 9/5) + 32 kilogram (kg) pound (lb) 2.205 kilowatt (kW) BTU/hr 3415 meter (m) foot (ft) 3.281 millibar (mbar) inches water column ("w.c.) 0.402 millibar (mbar) pounds/sq in (psi) 14.5 x 10-3 millimeter (mm) inch (in) 3.
Key to System Schematics Symbol Appearance Name Remarks Bulletin/ Info Guide RatioMatic Main gas shut-off valve train Main Gas Shut-Off Valve Train Gas Cock NC Solenoid Shut-Off Valve (Normally Closed) Eclipse strongly endorses NFPA as a minimum. Gas cocks are used to manually shut-off the gas supply on both sides of the main gas shut-off valve train. Solenoid valves are used to automatically shut off the gas supply on a bypass gas system or on small capacity burners.
Design Guide 110 11/11/2011
