World Grain - August 2014 - (Page 72)

FEED OPERATIONS Pellet mills Examining this important piece of feed production equipment and its accessories by Fred Fairchild In my two previous articles on pelleting, which ran in the April and May issues of World Grain, I discussed the pelleting system and the cooling and crumbling equipment. In this article I will examine the pellet mill itself along with its accessories. MASH FEEDER The feeder to move the dry mash from the mash bin to the conditioner is a special properly designed screw feeder. It is normally made out of stainless steel due to addition of the moisture into the conditioner that may enter the discharge area of the feeder. In some cases, the screw flighting on the feeder needs be doubled by installing 2-3 additional revolutions of screw flighting at the discharge end halfway between the regular flighting to minimize product surges from the feeder into the conditioning chamber(s). The feeder must be equipped with some type of method to adjust its speed to control the flow rate of the mash passing through it. The amount of mash being delivered determines the amount of steam needed to properly condition it and the amount of work required to drive the pellet mill. The speed is normally controlled using an A.C. Variable Speed starter and motor. The speed can be adjusted manually or by an automated control system. CONDITIONER Conditioning of the mash going to the pellet die is essential in making a good pellet. Conditioning involves adding heat and moisture to the dry mash and then holding the mixture in the conditioner for a specified period of time. This action is to accomplish two major purposes, destroy microorganisms and start the gelatinization process for the final product production. The conditioning process requires time, moisture and heat. A standard conditioner above the pellet mill is a round horizontal tube with paddles (picks) mounted on a shaft that runs the length of the tube to mix the material with the 72 moisture (steam) injected into the conditioning chamber. The conditioner diameter and length are determined by the volume needed to mix the materials and retain them for the needed time period. The size should be such that the conditioning chamber is nearly full during the mixing process, but not overloaded such that it might plug. In some cases, multiple conditioners are often connected in series if one unit is not enough to do the job. Various designs have been developed by pellet mill manufactures to meet the required action and retention times. California Pellet Mill Company has developed a hygieniser unit that fits between the standard conditioner discharge and the pellet mill. It is a jacketed unit that does not mix but passes the mixture through a maintained heat atmosphere on a firstin/first-out design. Wenger has developed a high intensity pre-conditioner (HIP) unit for use above extruders and pellet mills. It is a twin shaft design with separate motors on each shaft. It provides an intense mixing action while the materials are in the unit. To make any conditioner perform at its best, I recommend installing variable speed drives on the units. STEAM SYSTEM Steam supply systems for the conditioning of the mash before it goes to the die must be properly constructed to deliver high quality steam to the conditioning chamber(s). Steam from the boiler is usually sent to the pelleting equipment area under pressures of 125-150 psig, but needs to be reduced to 25 psig +/- as it enters the conditioning chamber(s). By transferring the steam to the pelleting system at high pressure, a smaller system pipe size is required. As an example, a pound of saturated steam at 125 psig has a volume of only 3.22 cubic feet. The same pound of steam at 25 psig occupies 10.5 cubic feet, and when the steam enters the conditioning chamber and has 0 psig, the volume of it is 26.8 cubic feet per pound. As the high pressure steam arrives for the conditioner sysAugust 2014 / World Grain / www.World-Grain.com http://www.World-Grain.com

Table of Contents for the Digital Edition of World Grain - August 2014

World Grain - August 2014
Table of Contents
From the Editor-in-chief - Fundamentals drive wheat prices
Calendar of Events
Latin American milling conferences
News Review - Interflour to build flour mill in Philippine free-trade zone
San Miguel to double flour milling capacity
ADM Milling completes expansion in Indiana
Bartlett building grain facility in Kansas
Cargill to build grain facility in Arkansas
Grupo Bimbo acquires Ecuadorean baker
Didion Milling names vice-president, business development
GrainCorp buys stake in Egyptian flour miller
Egypt purchases 5.1 million tonnes of wheat in 2013-14
United Grain plans bigger expansion at port
E.U. feed groups want decision on GMs
Toepfer renamed ADM Germany
E.U., EIB to work together on agriculture
Uzbekistan harvests record 8 million tonnes of grain
Ungashick joins World Grain sales team
E.U. sets import duty for first time in nearly four years
CHS earnings up 51% in third quarter
CHS makes management changes
Ardent Mills selects office location
Grain Market Review - Coarse grains
Country Focus - South Africa
Feature - Dawn of a New Era
Ardent Mills partners, executives, bring deep roots in flour milling
Regional Review - A Vital Grain Producer
Regional Review - Overflowing with Oilseeds
Regional Review - Export Challenges
Feature - Using Corn as a 'Lifeline'
LifeLine products
Technical Profile - Demanding the best
Feature - A Growing Issue
Feed Operations - Pellet Mills
Feature - Debugging your facility
Species spotted
Guest Commentary - Unforgettable: How flour saved Berlin
Feature - Olam's rice nucleus program
Rice Quarterly - UN sets acceptable levels of arsenic in rice
New rice mill planned for Arkansas
Italy wants ‘fairer’ rice deal
Thailand province developing jasmine rice
Thailand’s rice price shoots up on drought
Supplier News
Product Showcase
World Grain Archive
Ad Index/Fax Back Program

World Grain - August 2014

http://digital.world-grain.com/sosland/wg/2020_11_01
http://digital.world-grain.com/sosland/wg/2020_10_01
http://digital.world-grain.com/sosland/wg/2020_09_01
http://digital.world-grain.com/sosland/wg/2020_08_01
http://digital.world-grain.com/sosland/wg/2020_07_01
http://digital.world-grain.com/sosland/wg/2020_06_01
http://digital.world-grain.com/sosland/wg/2020_05_01
http://digital.world-grain.com/sosland/wg/2020_04_01
http://digital.world-grain.com/sosland/wg/2020_03_01
http://digital.world-grain.com/sosland/wg/2020_02_01
http://digital.world-grain.com/sosland/wg/2020_01_01
http://digital.world-grain.com/sosland/wg/2019_12_01
http://digital.world-grain.com/sosland/wg/2019_11_01
http://digital.world-grain.com/sosland/wg/2019_10_01
http://digital.world-grain.com/sosland/wg/2019_09_01
http://digital.world-grain.com/sosland/wg/2019_08_01
http://digital.world-grain.com/sosland/wg/2019_07_01
http://digital.world-grain.com/sosland/wg/2019_06_01
http://digital.world-grain.com/sosland/wg/2019_05_01
http://digital.world-grain.com/sosland/wg/2019_04_01
http://digital.world-grain.com/sosland/wg/2019_03_01
http://digital.world-grain.com/sosland/wg/2019_02_01
http://digital.world-grain.com/sosland/wg/2019_01_01
http://digital.world-grain.com/sosland/wg/2018_12_01
http://digital.world-grain.com/sosland/wg/2018_11_01
http://digital.world-grain.com/sosland/wg/2018_10_01
http://digital.world-grain.com/sosland/wg/2018_09_01
http://digital.world-grain.com/sosland/wg/2018_08_01
http://digital.world-grain.com/sosland/wg/2018_07_01
http://digital.world-grain.com/sosland/wg/2018_06_01
http://digital.world-grain.com/sosland/wg/2018_05_01
http://digital.world-grain.com/sosland/wg/2018_04_01
http://digital.world-grain.com/sosland/wg/2018_03_01
https://www.nxtbook.com/sosland/wg/2018_02_01
https://www.nxtbook.com/sosland/wg/2018_01_01
https://www.nxtbook.com/sosland/wg/2017_12_01
https://www.nxtbook.com/sosland/wg/2017_11_01
https://www.nxtbook.com/sosland/wg/2017_10_01
https://www.nxtbook.com/sosland/wg/2017_09_01
https://www.nxtbook.com/sosland/wg/2017_08_01
https://www.nxtbook.com/sosland/wg/2017_07_01
https://www.nxtbook.com/sosland/wg/2017_06_01
https://www.nxtbook.com/sosland/wg/2017_05_01
https://www.nxtbook.com/sosland/wg/2017_04_01
https://www.nxtbook.com/sosland/wg/2017_03_01
https://www.nxtbook.com/sosland/wg/2017_02_01
https://www.nxtbook.com/sosland/wg/2017_01_01
https://www.nxtbook.com/sosland/wg/2016_12_01
https://www.nxtbook.com/sosland/wg/2016_11_01
https://www.nxtbook.com/sosland/wg/2016_10_01
https://www.nxtbook.com/sosland/wg/2016_09_01
https://www.nxtbook.com/sosland/wg/2016_08_01
https://www.nxtbook.com/sosland/wg/2016_07_01
https://www.nxtbook.com/sosland/wg/2016_06_01
https://www.nxtbook.com/sosland/wg/2016_05_01
https://www.nxtbook.com/sosland/wg/2016_04_01
https://www.nxtbook.com/sosland/wg/2016_03_01
https://www.nxtbook.com/sosland/wg/2016_02_01
https://www.nxtbook.com/sosland/wg/2016_01_01
https://www.nxtbook.com/sosland/wg/2015_12_01
https://www.nxtbook.com/sosland/wg/2015_11_01
https://www.nxtbook.com/sosland/wg/2015_10_01
http://digital.world-grain.com/sosland/wg/2015_09_01
http://digital.world-grain.com/sosland/wg/2015_08_01
http://digital.world-grain.com/sosland/wg/2015_07_01
http://digital.world-grain.com/sosland/wg/2015_06_01
http://digital.world-grain.com/sosland/wg/2015_05_01
https://www.nxtbook.com/sosland/wg/2015_04_01
https://www.nxtbook.com/sosland/wg/2015_03_01
https://www.nxtbook.com/sosland/wg/2015_02_01
http://digital.world-grain.com/sosland/wg/2015_01_01
https://www.nxtbook.com/sosland/wg/2014_12_01
https://www.nxtbook.com/sosland/wg/2014_11_01
https://www.nxtbook.com/sosland/wg/2014_10_01
https://www.nxtbook.com/sosland/wg/2014_09_01
https://www.nxtbook.com/sosland/wg/2014_08_01
https://www.nxtbook.com/sosland/wg/2014_07_01
https://www.nxtbook.com/sosland/wg/2014_06_01
https://www.nxtbook.com/sosland/wg/2014_05_01
https://www.nxtbook.com/sosland/wg/2014_04_01
https://www.nxtbook.com/sosland/wg/2014_03_01
https://www.nxtbook.com/sosland/wg/2014_02_01
https://www.nxtbook.com/sosland/wg/2014_01_01
https://www.nxtbook.com/sosland/wg/2013_12_01
https://www.nxtbook.com/sosland/wg/2013_11_01
https://www.nxtbook.com/sosland/wg/2013_10_01
https://www.nxtbook.com/sosland/wg/2013_09_01
https://www.nxtbook.com/sosland/wg/2013_08_01
https://www.nxtbook.com/sosland/wg/2013_07_01
https://www.nxtbook.com/sosland/wg/2013_06_01
https://www.nxtbook.com/sosland/wg/2013_05_01
https://www.nxtbook.com/sosland/wg/2013_04_01
https://www.nxtbook.com/sosland/wg/2013_03_01
https://www.nxtbook.com/sosland/wg/2013_02_01
https://www.nxtbook.com/sosland/wg/2013_01_01
https://www.nxtbook.com/sosland/wg/2012_12_01
https://www.nxtbook.com/sosland/wg/2012_11_01
https://www.nxtbook.com/sosland/wg/2012_10_01
https://www.nxtbook.com/sosland/wg/2012_09_01
https://www.nxtbook.com/sosland/wg/2012_08_01
https://www.nxtbook.com/sosland/wg/2012_07_01
https://www.nxtbook.com/sosland/wg/2012_06_01
https://www.nxtbook.com/sosland/wg/2012_05_01
https://www.nxtbook.com/sosland/wg/2012_04_01
https://www.nxtbook.com/sosland/wg/2012_03_01
https://www.nxtbook.com/sosland/wg/2012_02_01
https://www.nxtbook.com/sosland/wg/2012_01_01
https://www.nxtbook.com/sosland/wg/2011_12_01
https://www.nxtbook.com/sosland/wg/2011_11_01
https://www.nxtbook.com/sosland/wg/2011_10_01
https://www.nxtbook.com/sosland/wg/20111_09_01
https://www.nxtbook.com/sosland/wg/2011_08_01
https://www.nxtbook.com/sosland/wg/2011_07_01
https://www.nxtbook.com/sosland/wg/2011_06_01
https://www.nxtbook.com/sosland/wg/2011_05_01
https://www.nxtbook.com/sosland/wg/2011_04_01
https://www.nxtbook.com/sosland/wg/2011_03_01
http://digital.world-grain.com/sosland/wg/2011_02_01
http://digital.world-grain.com/sosland/wg/2011_02_01
http://digital.world-grain.com/sosland/wg/2011_01_01
http://digital.world-grain.com/sosland/wg/2010_12_01
http://digital.world-grain.com/sosland/wg/2010_11_01
http://digital.world-grain.com/sosland/wg/2010_10_01
http://digital.world-grain.com/sosland/wg/2010_09_01
http://digital.world-grain.com/sosland/wg/2010_08_01
http://digital.world-grain.com/sosland/wg/2010_07_01
http://digital.world-grain.com/sosland/wg/2010_06_01
http://digital.world-grain.com/sosland/wg/2010_05_01
http://digital.world-grain.com/sosland/wg/2010_04_01
http://digital.world-grain.com/sosland/wg/2010_03_01
http://digital.world-grain.com/sosland/wg/2010_02_01
http://digital.world-grain.com/sosland/wg/2010_01_01
http://digital.world-grain.com/sosland/wg/2009_12_01
http://digital.world-grain.com/sosland/wg/2009_11_01
http://digital.world-grain.com/sosland/wg/2009_10_01
http://digital.world-grain.com/sosland/wg/2009_09_01
http://digital.world-grain.com/sosland/wg/2009_08_01
http://digital.world-grain.com/sosland/wg/2009_07_01
http://digital.world-grain.com/sosland/wg/2009_06_01
http://digital.world-grain.com/sosland/wg/2009_05_01
http://digital.world-grain.com/sosland/wg/2009_04_01
http://digital.world-grain.com/sosland/wg/2009_03_01
http://digital.world-grain.com/sosland/wg/2009_02_01
http://digital.world-grain.com/sosland/wg/2009_01_01
http://digital.world-grain.com/sosland/wg/2008_12_01
http://digital.world-grain.com/sosland/wg/2008_11_01
http://digital.world-grain.com/sosland/wg/2008_10_01
http://digital.world-grain.com/sosland/wg/2008_09_01
http://digital.world-grain.com/sosland/wg/2008_08_01
http://digital.world-grain.com/sosland/wg/2008_07_01
http://digital.world-grain.com/sosland/wg/2008_06_01
http://digital.world-grain.com/sosland/wg/2008_05_01
http://digital.world-grain.com/sosland/wg/2008_04_01
http://digital.world-grain.com/sosland/wg/2008_03_01
http://digital.world-grain.com/sosland/wg/2008_02_01
http://digital.world-grain.com/sosland/wg/2008_01_01
http://digital.world-grain.com/sosland/wg/2007_12_01
http://digital.world-grain.com/sosland/wg/2007_11_01
http://digital.world-grain.com/sosland/wg/2007_10_01
http://digital.world-grain.com/sosland/wg/2007_09_01
http://digital.world-grain.com/sosland/wg/2007_08_01
http://digital.world-grain.com/sosland/wg/2007_07_01
http://digital.world-grain.com/sosland/wg/2007_06_01
http://digital.world-grain.com/sosland/wg/2007_05_01
http://digital.world-grain.com/sosland/wg/2007_04_01
http://digital.world-grain.com/sosland/wg/2007_03_01
http://digital.world-grain.com/sosland/wg/2007_02_01
http://digital.world-grain.com/sosland/wg/2007_01_01
http://digital.world-grain.com/sosland/wg/2006_12_01
http://digital.world-grain.com/sosland/wg/2006_11_01
http://digital.world-grain.com/sosland/wg/2006_10_01
http://digital.world-grain.com/sosland/wg/2006_09_01
http://digital.world-grain.com/sosland/wg/2006_08_01
http://digital.world-grain.com/sosland/wg/2006_07_01
http://digital.world-grain.com/sosland/wg/2006_06_01
http://digital.world-grain.com/sosland/wg/2006_05_01
http://digital.world-grain.com/sosland/wg/2006_04_01
http://digital.world-grain.com/sosland/wg/2006_03_01
http://digital.world-grain.com/sosland/wg/2006_02_01
http://digital.world-grain.com/sosland/wg/2006_01_01
http://digital.world-grain.com/sosland/wg/2005_12_01
http://digital.world-grain.com/sosland/wg/2005_11_01
http://digital.world-grain.com/sosland/wg/2005_10_01
http://digital.world-grain.com/sosland/wg/2005_09_01
http://digital.world-grain.com/sosland/wg/2005_08_01
http://digital.world-grain.com/sosland/wg/2005_07_01
http://digital.world-grain.com/sosland/wg/2005_06_01
http://digital.world-grain.com/sosland/wg/2005_05_01
http://digital.world-grain.com/sosland/wg/2005_04_01
http://digital.world-grain.com/sosland/wg/2005_03_01
http://digital.world-grain.com/sosland/wg/2005_02_01
http://digital.world-grain.com/sosland/wg/2005_01_01
http://digital.world-grain.com/sosland/wg/2004_12_01
http://digital.world-grain.com/sosland/wg/2004_11_01
http://digital.world-grain.com/sosland/wg/2004_10_02
http://digital.world-grain.com/sosland/wg/2004_10_02
http://digital.world-grain.com/sosland/wg/2004_10_01
http://digital.world-grain.com/sosland/wg/2004_09_01
http://digital.world-grain.com/sosland/wg/2004_08_01
https://www.nxtbookmedia.com