Focus on Coal
Improving high calcium ash conditioning U
nited Conveyor Corporation (UCC) has released a Pin-Paddle Mixer/ Unloader designed specifically for conditioning high calcium ash, with reduced buildup, maintenance time and expense. The Mixer/Unloader conditions ash and other abrasive material with water to suppress dust and ease transport to trucks and rail cars. Paddles push and propel material forward, while fast, counter- rotating shafts ad pins lift the material and create turbulent mixing to expose the ash for optimal wetting. “Fly ash containing high amounts of calcium compounds from Powder River
Basin coal and/or emission control processes can create a number of challenges for plants using traditional methods of ash conditioning for disposal,” states Dan Charhut, UCC Vice President of Technology. “Frequent wet/dry cycles (starts and stops) accelerate a cement-like build-up of material, which increases power consumption while decreasing throughput capacity. UCC incorporates new design features into its Pin-Paddle Mixer/Unloader to address these problems resulting in less clean-out maintenance.” The new design features include patent- pending cleaning chains, designed to generate contact against the ash material and pin-paddles to reduce buildup during each cycle stop. The cleaning chains can improve Mixer/ Unloader throughput by up to 50 per cent. They are offered as a
retrofit kit or as an optional feature on new 4050 and 6050 Mixer/ Unloaders.
Index of Advertisers
ABB Engineering Services AUMA Aalborg Engineering Bekaert Bronswerk Camfil Farr Carl Stahl Castolin Eutectic Caterpillar Dresser Roots Fibox Flexim Frenzelit Harco Laboratories Haws Hilliard
66
www.engineerlive.com
58 11
58A 37A 22
19A 14 61 42 19 13
27A 27 37 62
62A
Inpro/Seal Kopar Liebherr Magotteaux Maxon Multi-Contact NEM RUD Ketten SIPOS Aktorik Solvina Sulzer Turbo Services Vacon Vestas WEG Waukesha Bearings
2
61A 57A 5
29A 45 67 17 25 29 21 30 68 6
34 New spray nozzle styles are utilized for
improved water penetration into the bed of material for uniform conditioning and can be independently controlled to allow precise water discharge during start up, mixing and shut down. Spray nozzles are located at the highest point of the Mixer/ Unloader cover, minimizing the potential for plugging. Nozzles are accessible and can be replaced from outside the mixer/unloader. Additional features of the Pin-Paddle
Mixer/Unloaders include: the shafts and pins use covers made of ultra high molecular weight polyethylene (UHMW PE) material to resist buildup. Even distribution of power between shafts minimizes shaft stress and deflection. A toothed drive belt offers smooth, low-maintenance power transmission without the need for high-maintenance timing gears and lubrication. l
For more information, vist
www.unitedconveyor.com
Page 1 |
Page 2 |
Page 3 |
Page 4 |
Page 5 |
Page 6 |
Page 7 |
Page 8 |
Page 9 |
Page 10 |
Page 11 |
Page 12 |
Page 13 |
Page 14 |
Page 15 |
Page 16 |
Page 17 |
Page 18 |
Page 19 |
Page 20 |
Page 21 |
Page 22 |
Page 23 |
Page 24 |
Page 25 |
Page 26 |
Page 27 |
Page 28 |
Page 29 |
Page 30 |
Page 31 |
Page 32 |
Page 33 |
Page 34 |
Page 35 |
Page 36 |
Page 37 |
Page 38 |
Page 39 |
Page 40 |
Page 41 |
Page 42 |
Page 43 |
Page 44 |
Page 45 |
Page 46 |
Page 47 |
Page 48 |
Page 49 |
Page 50 |
Page 51 |
Page 52 |
Page 53 |
Page 54 |
Page 55 |
Page 56 |
Page 57 |
Page 58 |
Page 59 |
Page 60 |
Page 61 |
Page 62 |
Page 63 |
Page 64 |
Page 65 |
Page 66 |
Page 67 |
Page 68