PRODUCTS porous burner metal fibre burner industrial furnaces combustion technology combustion chambers and reactors ceramic pieces consulting and training
Issendorff Thermoprozesstechnik e.K. I Bahnhofstr. 19 I D-91083 Baiersdorf I I USt-IdNr.: DE 268 299 066

main characteristics

o high radiant heat output o low exhaust emissions o high thermal shock resistance o variable burner geometry o high power density up to 10MW/m² o high power modulation up to 1:10 o adjustable temperature of the burner surface
metal  fibre burners

Metal fibre burner (MFB)

Metal   fiber   burners   are   typically   used   in   applications   where   uniform   heating   of   the   product by   infrared   radiation   is   advantageous.   Both   the   burner   output   and   the   emitted   radiant heat   can   be   controlled   over   a   wide   range.   The   reaction   times   of   metal   fiber   burners   are just   a   few   seconds.   This   allows   the   temperature   curve   required   for   an   optimum   heating process    of    the    workpiece    to    be    precisely    and    reproducibly    achieved.    The    risk    of overheating   of   the   product   is   drastically   reduced.   Short   heating   times   and   low   excess   air increase   the   energy   efficiency   of   the   heated   process   plants.   Due   to   the   simple   cutting   of the   surface   material   used,   even   complicated   burner   shapes   can   be   realized.   The   power range   in   which   metal   fiber   burners   are   used   extends   from   a   few   kilowatts   to   several megawatts. Metal   fiber   burners   can   be   operated   with   natural   gas,   LNG,   biogas,   methane,   ethane, propane, butane, lean gas or also with hydrogen/methane mixtures.

Application examples

powder coating, surface treatment drying process tool heating welding preheating boiler heating thermal exhaut gas treatment coffee roasting surface browning of baked products

Metal fibre surface

The   burner   surface   of   the   metal   fiber   burner   is   made   of   Bekinit®.   DThe   uniquely   knitted 3D   material   is   made   of   highly   heat-resistant   Fecralloy®   metal   fibre   and   can   be   used   as   a curved,   cylindrical   or   flat   burner   surface.   The   flexible   structure   of   the   material   reduces   the thermal   shock   susceptibility   of   the   burners.   The   processing   of   the   long-term   stable   fiber leads to a reliable radiant heat output with simultaneous high power modulation.

Radiant operation

An   approx.   1   mm   thin,   barely   visible   flame   carpet   stabilizes   over   the   burner   surface, which   is   evenly   permeated   by   the   fuel   gas/air   mixture.   Due   to   the   high   temperature gradient   in   the   flame,   heat   is   transported   against   the   direction   of   flow   towards   the   burner surface. The   transferred   heat   causes   the   burner   surface   to   glow.   The   temperature   of   the   burner surface   depends   on   the   type   of   fuel   gas,   the   excess   air   and   the   burner   capacity.   The maximum    radiation    intensity    of    the    metal    fibre    burner    depends    on    the    surface temperature and ranges between 2,2 m – 3,3 m. Properties in radiant mode Spec. surface load: 100 - 500 kW/m² Maximum radiation efficiency: ca. 40 % air exces ratio: 1,1 - 1,5 burner surface temperature: 600 °C – 1050 °C Furnace and plant temperature: < 400 °C

Blue flame operation

If   the   specific   area   output   exceeds   650   kW/m²,   the   distance   between   the   flame   carpet and   the   burner   surface   increases.   The   heat   transport   from   the   flame   to   the   burner   surface is   greatly   reduced   and   the   temperature   of   the   burner   surface   drops   significantly.   The flame   length   can   be   a   few   centimetres   in   this   operating   condition.   Typical   for   premixed flames is the bluish colour. Properties in blue flame mode Spec. surface load: 650 – 10.000 kW/m² air exces ratio: 1,1 -1,5 burner surface temperature: < 150 °C Furnace or plant temperature: < 800 °C
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