Can you supply the fans across the whole pulp & paper mill, or only one duty?
Across the whole mill. We have executed a handful of pulp & paper duties spanning recovery-boiler and power-boiler ID and FD, lime-kiln induced draught and exhaust, machine-hall and process ventilation, dirty-side dust extraction, combustion and process air, and the corrosive bleach-plant exhaust. Each fan is engineered to its own gas, temperature and corrosion load — the hot sticky recovery ID and the wet chlorine bleach vent are different machines — but they come from one partner, on one engineering convention across the plant. The underlying fan engineering is proven across our whole range.
What is the maximum gas temperature you handle on a lime-kiln or boiler ID fan?
Continuous duty up to 600 °C across the envelope. Lime-kiln exhaust typically runs to about 400 °C at the fan and recovery and power-boiler ID around 150 to 350 °C. Above about 350 °C we fit a shaft cooling disc to keep heat off the bearings, keep the bearings outside the airstream, and add expansion joints for the thermal growth. Refractory lining is attested to 600 °C for the hottest kiln duty. The fan is built for your stated gas temperature and excursion case, not a generic rating.
Recovery-boiler gas carries sticky carryover and is an explosion concern. How do you handle it?
Recovery-boiler flue gas carries sticky sodium-salt smelt carryover and fume that fouls a wheel and unbalances it, and the black-liquor burn makes the stream a fire and explosion concern. We use a rugged radial wheel that resists buildup and sheds fume, choose blade geometry so carryover does not key onto the wheel, and fit cleanout, wash and inspection doors so the wheel cleans down in place. Construction, clearances and any ATEX scope are matched to the boiler-house area classification you give us.
Our bleach plant exhaust is wet chlorine and chlorine dioxide. What materials do you use?
We size the metallurgy to your gas analysis. Bleach-plant exhaust runs wet and below the acid dew point (roughly 50 to 90 °C), so we select 316L or a higher alloy on the wetted surfaces, or an FRP or coated build where the chlorine chemistry demands it, and design the casing to drain and dry rather than hold wet acid. The right answer depends on your chlorine and chlorine-dioxide concentration, moisture and temperature, so we engineer it to your gas, not a default.
Can you build a replacement to match our existing paper-mill fan's duty and footprint?
Yes. We reverse-engineer to the existing duty point (flow, static pressure, gas temperature, density and dust or corrosion load), bearing centres, inlet/outlet orientation and foundation bolt pattern so the unit drops onto the existing base and ducting — whether it is a recovery or power-boiler ID, an FD fan, a lime-kiln ID or a bleach-plant exhaust fan. Made to your installation, not a nearest-catalogue substitute. Send the old GA, the nameplate and a curve if you have one, and we match it.
Do you performance-test the fans, and what about AMCA, CE, ATEX and quality certification?
Every fan is performance-tested in-house to the AMCA 210 / ISO 5801 method on our 200 HP VFD test rig, and dynamically balanced to ISO 21940 G6.3 as standard (G2.5 / G1.0 on application). Because the rig runs cold air, hot boiler and kiln-gas operation is extrapolated by fan-law correction for density. To be precise: that in-house testing is to the AMCA 210 / ISO 5801 method, not AMCA-certified; CE is self-declared per 2006/42/EC and 2014/35/EU, and ATEX Zone 2/22 is self-declared per 2014/34/EU (Category 3) where the recovery boiler-house area classification calls for it — those are self-declarations of conformity, not third-party certifications. Our only third-party certification is ISO 9001:2015.
