MAWERA FSB Series Firebox Boiler with a Flat Moving Grate Brochure

Model Capacity* FSB 180 45 - 180 kW 0.15 - 0.61 MBTU/h FSB 220 55 - 220 kW 0.19 - 0.75 MBTU/h FSB 280 70 - 280 kW 0.24 - 0.96 MBTU/h FSB 350 90 - 350 kW 0.31 - 1.20 MBTU/h FSB 440 110 - 440 kW 0.38 - 1.50 MBTU/h FSB 550 140 - 550 kW 0.48 - 1.88 MBTU/h FSB 700 175 - 700 kW 0.60 - 2.39 MBTU/h FSB 850 215 - 850 kW 0.73 - 2.90 MBTU/h FSB 1,100 275 - 1,100 kW 0.94 - 3.76 MBTU/h FSB 1,400 350 - 1,400kW 1.20 - 4.80 MBTU/h FSB 1,700 425 - 1,700kW 1.45 - 5.80 MBTU/hFacts and Figures: MAWERA Firebox Boiler with a Flat Moving Grate, Product Line FSBProduct information MAWERA Firebox Boiler with a Flat Moving GrateFSB Series0.6 MBTU/h to 5.8 MBTU/h (180 to 1,700kW)Design and Operation Apart from conventional biomass, this flat moving grate is particularly designed to burn wood fuel with a high ash and high moisture content.Significant advantages of the flat moving grate combus-tion in the FSB Series are: 1. a wide variety of wood fuel can be used, and 2. lower particulate matter emissions due to an undisturbed fuel bed.MAWERA’s flat moving grate boilers use a Low-NOx firebox technology. Our Low-NOx combustion chamber is equipped with variable and controlled primary air supply, automatic modulation flame control, and O2 regulation (Oxygen Trim System) thus reducing NOx emissions. The geometry of the combustion chamber was developed based on research at our test facilities and in cooperation with Graz Technical University. As a result, NOx emissions are reduced by 80% compared to fireboxes with a conventional moving grate technology.Wood fuel is discharged from bunkers or silos using MAWERA’s hydraulic push rams or MAWERA’s silo dischar-ge system. Depending on architectural constrains and the particle size of the fuel, push rods, chain conveyors or tube screw augers can be used to transport the fuel. Ident. no. 35.22 - 35.32 Boiler model: Standard boiler with 230°F (110°C) outlet temperature and 58 PSI (4 bar) operational pressure; the boiler can also be built for higher operational pressure, higher outlet temperature and with an individual certification by the German Technical Inspection Agency (German TUEV) or ASME (USA & Canada). The following wood fuel may be used: Wood residue from forestry operations („slush“), wood from landscaping (bark), wood waste from sawmills (trims, cut-offs, planer shavings, saw dust, sander dust, fines), particle boards, MDFs (medium density fiberboard). Fuel moisture content: 10% to 55% m.c. (wet basis) Fuel grade: particle size from 7/16’’ to 4’’ (11.2 to 100 mm) conveyed by a Screw, above 4’’ conveyed by hydraulic push ram* heat output depends on the type of fuel used, particularly its moisture contentMAWERA HolzfeuerungsanlagenGesellschaft mbHA 6971 Hard am BodenseeNeulandstraße 30T +43 - (0)5574 - 74 301-0F +43 - (0)5574 - 74 301-20info@mawera.comwww.mawera.comMAWERAKessel & Maschinenbau GmbHD 88131 LindauRobert-Bosch-Straße 15T +49 - (0)8382 - 977 012T +49 - (0)8382 - 977 013info@mawera.comwww.mawera.comMAWERA (UK) Limited 31 Enterprise Ind. Est. Britannia Way LICHFIELD Staffordshire WS 14 9UY P +44 - (0)1543 - 25 88 44 F +44 - (0)1543 - 41 63 11 info@mawera.comwww.mawera.comMAWERA (Canada) Ltd.104 Sixth Street East, P.O. Box 2716Revelstoke, BCV0E 2S0 CanadaP +1 (250) 814 - 7184F +1 (250) 837 - 5556info@mawera.cawww.mawera.caT1 Ash temperature M1 Primary fanT2 Fire temperature primary combustion chamber M2 Secondary fanT3 Fire temperature secondary combustion chamber M3 Flue gas fan T4 Boiler supply temperature M4 Flue gas recirculation (optional)T5 Boiler return temperature M5 Hydraulic unit for the grate / de-ashing T6 Flue gas temperature downstream from the boiler M6 Hydraulic unit for the walking floor T7 Flue gas temperature downstream from the economizer (opt.) M7 Hydraulic unit for the push rod stoker B1 Lambda probe (O2 control) B3 Laser barrier monitoring the fire bed B2 Negative pressure measurement (and control) (only in combination with hydraulic stoker)MAWERA Fire Box Boiler FSB with Flat Moving GrateDesign and OperationMain Features:l high efficiency: up to 91%l available for temperatures above 230°F (110°C) according to German TUEV standards or ASME (USA & Canada)l minimal radiation losses through complete insulation of the entire boiler unitThe entire system is controlled by the well proven micro-processor MAWERA Logic 300 operated by a touch screen panel. In addition, a modem for remote maintenance, a human-machine interface (“MAVIS”) and a tele-emergency alert system are available.Three-pass flame tube boiler - a back-up oil or gas burner can be addded to the cover, swivelling into the flame tubeAdd-on soot blower for cleaning heat exchanger View into the combustion chamber with dome-shape brick refractoryFlat moving grate FSB - hydraulically driven (two independently moving sub-grates available for boilers with a nominal capacity of 850 kW / 2.9 MBTU/h and larger)Hydraulic fuel stoker (left) and controlled primary air distribution (right)Combustion chamber design - unique multi-sec-tional insulation and high quality brick refractory liningl resting firebed yields significantly lower emissionsl built-in emergency heat ex- changer allows quick operational changes; meets DIN 4751 part 2 (German industrial standard)l overlapping, pre-stressed grate bars keep fuel from falling through the grate (ash is removed permanently and automatically underneath the grate)l three-pass flame tube boiler with flue gas temperatures below 374°F (190°C) at full-load l high wear-resistance due to generously-sized grate surfacel heat output can be gradually varied between 25% to 100% of the rated capacity; low emissions even at partial loadOptional - de-ashing into an ash container; directly or via screw Primary air supply at various zones; air pre-heating or flue gas re-circulation optional