Pilot Burner ZMI Technical Information - Combustion 911

Application > Examples of applicationIn the case of combined pilot and main burners, EN 746-2:2010stipulates the monitoring of pilot and main burner via the automaticburner control unit. Exceptions are permitted providedthat the safety of the installation is not impaired.1.1.1 Alternating pilot burner with modulating-controlledmain burner1.1.2 Igniting a flame curtain60DJLZ60DJZ VG 8 VG 8GEHZMI60DJZ VG 8 VG 8GEHGEHAKTVASVAGMB/BVHMLEHGEHEKOEKOZMI 16As soon as voltage is supplied to the ignition transformer, thepilot burner ZMI is ignited using an ignition spark. If the pilotburner provides a stable ionization signal, the enable signalfor the flame curtain is then issued via the automatic burnercontrol unit. The flame curtain is ignited.60DJLZGEHAs soon as voltage is supplied to the ignition transformer, thepilot burner ZMI is ignited using an ignition spark. If the pilotburner detects a stable ionization signal, the enable signalfor operation of the main burner is issued via the automaticburner control unit. The main burner is ignited. If the mainburner provides a stable flame signal, the pilot burner ZMIcan be switched off.ZMI · Edition 03.12 5

Project planning information5.2 InstallationInstall the pilot burner so that reliable ignition of the mainburner is guaranteed.The pilot burner tip can be positioned exactly using the moveablemounting device.When pilot burners ZMI are installed in a burner quarl, the tipof the pilot burner is subjected to a very high thermal stress. Ameans of cooling the ZMI must always be provided. Air mustconstantly be passed through a 3 mm gap on the outside ofthe flame tube. As a result of this measure, the service life ofthe pilot burners can be significantly increased.5.2.1 ZMI in burner quarlAir nozzlewith test pointCooling airT-pieceGEH3 mmØ ZMI dia.Ø Burner quarl dia.Flame tube tipThe tip of the pilot burner flame tube must not come into contactwith the main burner flame. Safe ignition of the main burnermust be ensured.To avoid spontaneous combustion, the temperature of thegas/air mixture upstream of the tip of the flame tube must belower than the ignition temperature of the fuel gas ≤ 500°C.When the pilot burner is switched off, the pilot burner air shouldcontinue to flow to ensure that the pilot burner is cooled.To adjust the cooling air volume, we recommend usingthe same air nozzles as for ZMI 16 (Ø 3.3 mm) and ZMI 25(Ø 4.5 mm). The air pressure at the test point is set to approx.20 to 25 mbar using adjusting cock GEH.ZMI · Edition 03.12 10

6 Accessories6.1 Gas nozzle6.3 Ignition transformerTo ensure safe ignition, we recommend using ignition transformerTGI 5-15/100W or TZI 5-15/100W.BurnerZMI 16ZMI 25Gas typeNaturalgasLPGTown gas/coke ovengasNaturalgasLPGTown gas/coke ovengasNozzle dia.[mm (inch)]0.94(0.037)0.76(0.029)1.30(0.051)1.40(0.055)1.05(0.041)1.78(0.070)Order No.ZMI ZMI..T75455010 7544215775455147 7544803275455146 –75455012 7544315775455149 7544803175455148 –TGI 5-15/100WTZI 5-15/100W6.2 High-voltage cableFor the ionization and ignition cables, use unscreened highvoltagecable:FZLSi 1/7 -50 to 180°C (-58 to 356°F),Order No. 04250410,orFZLK 1/7 -5 to 80°C (23 to 176°F),Order No. 04250409.ZMI · Edition 03.12 11

7 Technical dataCapacity:ZMI 16: 1 to 2 kW,ZMI 25: 2.5 to 4 kW (1.5 to 3.3 kW when used with town gas,coke oven gas).Gas inlet pressure: up to 80 mbar (up to 32 "WC),air inlet pressure: up to 120 mbar (up to 46.8 "WC),each depending on the gas type.Burner pressures: flow rate curves for ZMI, seewww.docuthek.com Elster KromschröderSearch term: ZMIKind of document: Flow rate curvesRegistration required!Burner length increments: 100 mm.Gas types: natural gas, LPG (gaseous) and coke oven gas;other gases on request.For cold air only.Flame control: with ionization electrode.Ignition: direct spark ignition (5 kV ignition transformer).Angle plug: interference-suppressed.Housing: aluminium.Flame tube: heat-resistant steel.Max. temperature at the tip of the flame tube:1000°C (1832°F),for lambda < 1:900°C (1652°F).ZMI · Edition 03.12 13

Technical data7.1 DimensionsLAEABRDH1FGAH2LCZMI 16[mm] Dimensions [mm] DIN 2999 DIN EN ISO 228-1D A B C E F H1 H2 GA LA R16 ~44 13.5 ~106 49 36 96 45 Rp 1 / 4 Rp 1 / 2 G 1 / 2* L = burner length increments: 150, 200, 300 ... mmZMI 25[mm] Dimensions [mm] DIN 2999 DIN EN ISO 228-1D A B C E F H1 H2 GA LA R25 ~78 19 ~112 49 36 96 45 Rp 1 / 4 Rp 1 / 2 G 1* L = burner length increments: 150, 200, 300 ... mmZMI · Edition 03.12 14

Technical data7.2 Converting unitsSI unit × multiplier = US unitm 3 /h 35.31 CFHmbar 0.0145 psimbar 0.39 "WCmm 0.039 inchkg 2.2 lbslitres 0.26 galm/s 3.28 ft/sUS unit × multiplier = SI unitCFH 0.0283 m 3 /hpsi 68.89 mbar"WC 2.54 mbarinch 25.4 mmlbs 0.45 kggal 3.79 litresft/s 0.3048 m/s°C = (°F - 32) × 5 /9°F = (°C × 9 /5) + 32ZMI · Edition 03.12 15

8 Maintenance cyclesWe recommend a function check at least once a year.ZMI · Edition 03.12 16

FeedbackFinally, we are offering you the opportunity to assess this “Technical Information (TI)” and to give us your opinion, so that wecan improve our documents further and suit them to your needs.ClarityFound information quicklySearched for a long timeDidn’t find informationWhat is missing?No answerComprehensionCoherentToo complicatedNo answerScopeToo littleSufficientToo wideNo answerUseTo get to know the productTo choose a productPlanningTo look for informationRemarksNavigationI can find my way aroundI got “lost”No answerMy scope of functionsTechnical departmentSalesNo answerContact(Adobe Reader 7 or higher required)www.adobe.comElster GmbHPostfach 2809 · 49018 OsnabrückStrotheweg 1 · 49504 Lotte (Büren)GermanyT +49 541 1214-0F +49 541 1214-370info@kromschroeder.comwww.kromschroeder.comwww.elster.comThe current addresses of our international agents areavailable on the Internet:www.kromschroeder.de/index.php?id=718&L=1We reserve the right to make technical modificationsin the interests of progress.Copyright © 2012 Elster GroupAll rights reserved.03251025ZMI · Edition 03.12 17