Can you supply the fans across the whole cement flowsheet, or only one duty?
Across the whole flowsheet. We have executed 22 cement & lime duties spanning kiln and preheater ID, kiln/calciner exhaust, clinker and product cooling, coal-mill primary air, raw-mill and cement-mill vent, dirty-side dust extraction, bag-filter and pulse-jet draught, and the ESP or baghouse main fans. Each fan is engineered to its own gas, temperature and dust load — the hot dirty kiln ID and the clean primary-air fan are different machines — but they come from one partner, on one engineering convention across the plant.
What is the maximum gas temperature you handle on a kiln ID or exhaust fan?
Continuous duty up to 600 °C across the envelope, with most kiln and preheater ID running 200 to 450 °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 (a 1 m shaft grows about 7 mm from cold to 600 °C). 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.
Cement kiln dust is brutal. How do you protect the wheel and casing?
Cement kiln and clinker dust is the hardest and sharpest in any fan duty, and raw-side loads are among the heaviest in any fan duty, so we protect three ways sized to your loading. A rugged radial wheel that sheds dust and resists erosion; chrome-carbide hard-facing on the blade leading edges and high-wear zones; and bolted-in, replaceable wear plates and liners at the scroll throat and inlet with inspection and cleanout doors, so worn parts change out in place. The wear scope is replaceable, not welded in — which is what keeps the fan running a full kiln campaign.
Our kiln gas is alkali-laden and some circuits drop below the acid dew point. What do you do?
We size the metallurgy and the dew-point margin to your gas analysis. On alkali-laden gas we choose blade geometry that does not let alkali key onto the wheel and specify corrosion-resistant material where it condenses. Below the acid dew point (typically 120 to 150 °C, common on the cooler mill-vent and ESP circuits) we keep the casing wall above dew point with insulation and heat tracing and select Corten or 316L on the wetted surfaces, stepping to higher alloys on request. The right answer depends on your alkali content, SO₂/SO₃ and moisture, so we engineer it to your gas, not a default.
Can you build a replacement to match our existing cement fan's duty and footprint?
Yes. We reverse-engineer to the existing duty point (flow, static pressure, gas temperature, density and dust load), bearing centres, inlet/outlet orientation and foundation bolt pattern so the unit drops onto the existing base and ducting — whether it is a kiln ID, a cooler fan, a primary-air fan or an ESP main 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 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 area classification calls for it — those are self-declarations of conformity, not third-party certifications. Our only third-party certification is ISO 9001:2015.
