Biomass Dryers. Presented By GenCap Technologies Inc. 9/9/2010

Transcription

1 2010 Bimass Dryers Presented By GenCap Technlgies Inc. 9/9/2010

2 A Cmparisn f Bimass Dryers 2010 Table f Cntents List f Figures... 2 ROTARY DRYERS... 3 Cmpanies... 3 FLASH DRYERS/PNEUMATIC DRYERS... 4 Cmpanies... 4 RING DRYERS (mdified flash dryer)... 5 Cmpanies... 5 FLUID BED DRYERS... 6 Cmpanies... 6 SPRAY DRYERS... 7 Cmpanies... 7 ARTICLES... 8 Frm Operating Ease t Operating Csts: Weighing Differences in DDGS Dryers 8 Page 1

3 A Cmparisn f Bimass Dryers 2010 List f Figures Figure 1 GEA Barr- Rsin Flash Dryer... 4 Figure 2 Open system f a Fluid Bed Dryer... 6 Figure 3 GEA Nir Spray Dryer diagram... 7 Page 2

4 A Cmparisn f Bimass Dryers 2010 Purpses Chemical Pharmaceutical Fd Maize germs Pwders Crystalline materials Structure Cylinder shell inclined at angle (0-5 degrees) Functin: cnveyr and heating device Lifting flights inside t increase cntact with surface area Cst and Output $ per year t maintain 74.8% capital 25.2% peratinal Prduce 150 kg/h db dried ptat cubes Advantages 80-90% f misture reduced ( d&dq=rtary+bimass+dryers&printsec=abstract#v=nepage&q=rtary%20bimass%20dryers& f=false) Lw maintenance Large vlume Disadvantages Can nly dry certain vlume at a time (nt a cntinuus feed) Slw (10-20 minutes residence time) Cannt dry sludge, wet waste, fine grains, any similar materials Burns fssil fuel t create heat Expensive because use f fssil fuel Only 10-15% f cylindrical vlume is filled High energy cnsumptin, lw utput Whiting Equipment Canada Inc. (Swensn dryers) Ambient air temp up t 350 degrees F Direct heat dryer prduced ht air- up t 1800 degrees F Teafrd PPH water evapratin frm PPH bne dry material Page 3

5 A Cmparisn f Bimass Dryers 2010 GEA Barr- Rsin Evaprate tnnes/hur Purpses Sludge Wet cakes Fd Minerals Chemicals slurries Structure Spin flash dryer Hrizntal agitatr disperses mass that cmes in cntact with heat t dry Cage Mill flash dryer Vertical pin type rtary cages Wet mass fed thrugh center fr direct heat cntact Rtatin disperses feed while drying Cst Apprx. Output f few hundred kg/hur hundreds f tns/hur Apprx temp degrees C Advantages secnds f residence time Cylindrical shape and shrt time = high vlume f mass that can be dried Ideal fr fine grained materials Disadvantages Nt ideal fr heat sensitive materials Only dries surface misture GEA Barr- Rsin Use f scrubbers t clean exhaust gas t meet emissin requirements Elevated drying temperature Flashes ff surface misture, drying gas is instantly cled w/ increasing prduct temperature 20+ tns f water evapratin/hur Inlet air temp degree C Figure 1 GEA Barr- Rsin Flash Dryer Page 4

6 A Cmparisn f Bimass Dryers 2010 Airflw can exceed cfm ( m3/hur) Whiting Equipment Canada Inc. (Swensn dryers) Available in carbn steel, stainless steel and ther allys Purpses Sludge Fd (byprducts) grains Structure Materials first heat cntact is a flash f heat Particles pass thrugh rings fr further drying (if larger/wet particle, cnveyed back t dry again) Materials are then cnveyed t a secnd chamber clumn Heated air is mved thrugh clumn, drying particles Particles pass thrugh rings fr further drying (if larger/wet particle, cnveyed back t dry again) Cst Advantages Thrugh and cmplete drying Shrt residence time 2 secnds flash dry 4 minutes mixing recycle system Disadvantages Many parts t machine and drying prcess GEA Barr- Rsin Presence f manifld r internal classifier Centrifugal airstream and adjustable splitter blades mve heavier, semi dried material back int dryer Lighter dryer cntinues thrugh cnveyr Selective residence time cfm ( m 3 /hr) Natural gas, steam, ht il, flue gases used t perate Page 5

7 A Cmparisn f Bimass Dryers 2010 Purpses Fd Chemical Mineral Plymer Pwders/crystals/granules Structure Air supplied thrugh perfrated distributr plate Air flw velcity is sufficient t supprt mass weight Air turbulence causes materials t becme suspended n a cushin f air r gas Slids behave like biling liquid Cst Advantages Can hld high vlumes Optimum heat transfer efficiency Gd mixture Frequent cllisins between particles allw fr Disadvantages Nt easily perated with all the different parts Cmpanies Whiting Equipment Canada Inc. (Swensn dryers) Statinary and upright Use f feed chute r screw feeder Fluidized by gas (nitrgen) GEA Nir Vibr- Fluidizer Size 300 ft 2 Temperature up t 1200 degrees C Figure 2 Open system f a Fluid Bed Dryer High thermal capacity ensures accurate temperature cntrl unifrm heat treatment 90f heat supplied thrugh steam r circulating fluid Reductin in airflw = reductin in emissin, plant size and perating csts Page 6

8 A Cmparisn f Bimass Dryers 2010 Purpses Fd Pharmaceutical Structure Atmizes a wet slutin int drp lets Gas/spray mixing chamber Heated air is sprayed at tp f cne- shaped chamber Wet is mixture cmes in cntact with heat Dried particles gather at bttm Cst Advantages evenly and thrughly dried particles Disadvantages nly prduces pwder slids requires adequate drplet and spraying distance Cmpanies GEA Filtermat requires a lnger drying time includes cnveyr fr secnd stage drying Figure 3 GEA Nir Spray Dryer diagram air blws dwnward Whiting Equipment Canada Inc. (Swensn dryers) Page 7

9 A Cmparisn f Bimass Dryers Summary: Operability and Cntrl Rtary (gd) cntinues t run even if there is prcess prblem Material is t wet, sugar cntent t high, t much material in machine Adjustable temperature fr different vlumes f mass Ring (gd) Small vlume f material = Prduces better quality prduct Rtary (bad) Lng residence time = lng and hard recvery Especially if vlume f mass is high Ring (bad) Shrt residence time = smaller prcessing size Layut Rtary Requires large flr space and cncrete fundatin, lts f fundatin fr all part required Nt much steel invlved Ring Steel structure Only fan needs substantial fundatin Material Handling and Recycling Systems Rtary Ring Energy Usage Rtary Electrical Usage Lng cnveyr Dry prduct depsited n ne end, feeder feet at ther end Shrt cnveyr Assist f gravity in prcess Large diameter seals under suctin = leakage Use 5-10% mre heat Page 8

10 A Cmparisn f Bimass Dryers 2010 Rtary Ring Rtatin f drum t cnvey prduct Cnveys pneumatically and at high velcity Cnsumes mre pwer Maintenance Rtary Ring Cst f electrical pwer is much less than heat Mechanical systems n drum and extra cnveyrs require regular maintenance Only main fan needs maintenance Page 9