Document VKa5Jp4bo3Zg9Kq14jOe3xKGg

Unloading letup depends largely.on the way coal arrives. Some forma of shipping -- hargee, for example--can't self* unload at all, to unloading equipment U an absolute ne cessity. Other types, like hopper cars, con self-unload, but we often install equipment to speed the job or make It easier under bad conditions (dumpers, thawers. shakers, etc). And frequently we add devices, such as feeders, to set up a controlled flow to the next step in the handling process. If coal Is bought unsized, `and slsing is desirable for stor 'Since it isn't practical to deliver coal at the rate it's burned, age or firing, preparation may be done near the receiving !'Sritfetorage to permit less frequent shipments and to point, as diagrammed, or in plant near point of use. >'lnh out variations in delivery. Storage may be outdoors By transfer, we refer to handling between the unloading or,Under cover -- either in a silo or similar outside structure, point and the final storage point from which coal normally : ** la bins or bunkers in the plant. It's now common prnc- discharges to the Aring equipment. It may. involve only cat '' **Mxs to have a relatively small storage for normal needs and piece of equipment, or several, depending on local condi '^larger one (often outdoors) for reserve, with means for tions and whether there is more than one storage. erring from dead to live storage. '.V 1' In plant here refers to handling between Anal storage and the Aring equipment. Sometimes this would mean no more then chutes to direct Aow to individual Aring units and gates or velvet to control flow. Or, we might have a con* vcying system to feed coal from any bunker section to any Aring unit and to move coal from one bunker section to another. Weighing or measuring may be done near Aring units, at the receiving point, or at both locations. COAL HANDLING: For its few or many steps . P- ;i aH Vi ; $ "V, growing array of equipment combinations In essence, the job of a handling system is to move coal from a re ceiving point to the firing equip ment. Whether it's simple or com plex depends on how we receive the coal, how the plant is situated, and what we expect from the sys tem in capacity, flexibility, conven ience, etc. To meet such a variety of conditions and requirements, we have an extensive array of mecha nized handling devices, which may be combined in almost innumerable ways. Boslc Stops. It just isn't possible to set down what we might call a fypicaf coal-handling system. What we've tried to do in the chart above is break down the over-all operation into typical steps, ex plain the general function of each, and give some idea of the many ways they can be combined. And for each step, we've listed typical devices used. How Chart Works. Before tak ing a look at some of the combina tions diagrammed, let's be sure we know how it works. To make the over-all picture dearer, the chart divides it into steps or functions. Not all of these need be involved in any actual case. Nor will they always stand out clearly as sepa rate operations --a tingle piece of equipment may, in practice, handle two or more of these functions. The order in which steps are charted is close to that likely to be followed in many cases. But spe- icific operations, such as prepara tion or weighing, may be handled *:by truck. Truck dumps directly to ?i bln, from which o screw con- at other points than those shown. ireyar carries coal to a stoker. On fFinally, white flow arrows Indicate fte chart this would be lc-6-7-9. a great number of combinations, ^In another relatively simple set- the chart cannot, in the nature of sftip, railroad cars discharge over a things, cover all of the many pos `track hopper and a bucket elevator sible arrangements. r Hfts coal to the plant bunker. From Within these limitation*, how here it flows through chutes to ever, the chert helps to show what's 'hoker hoppers (Id-2-4-6-7-9). involved in this coal-handling job .^Adding Elements. Now let's and thus serves os a useful intro 'oppose the plant gets some more duction to discussions of functions Miers and extends1 the bunker. To and equipment that follow. <itribute along the length of the Simple Setups. Now let's look at -.bunker wc add a horizontal con- some possible setups, set how con 'yor over it. This means more ditions Influence them, and how the tanifer equipment, although chart chart pictures them. Simplest situ 'tquence is still la-2-4-6-7-9. But ation might be a basement plant in * .^improve operation we add coal a city building, with coal received ..Kales. Then we have another chart step, end sequence is la.2*4*6-7-8-9. To protect against major delays in shipments, we odd on outdoor storage and a bulldozer for build ing the pile. To provide an initial pile for the dozer to work from we use a portable conveyor. The dozer reclaims to the track hopper. Then, when we're using the outdoor pile, the coal-handling sequence becomes la-2-5-4-6-7-8-9. Complex System. Now, to give the chart a real workout, let's look at on actual system receiving coai by both water and rail. A coal tow. er unloads the barges and a con* veyor carries coal to a crusher house (lb-2-4-3). A rotary car dumper unloads rail shipments to a hopper feeding another conveyor leading to the crusher house (la-2- 4-3). The crusher house serves as a transfer point, for routing coal into the plant or to a drag scraper for building an outdoor pile and re claiming from it. So for direct han dling into the plant the over-all lineup is: lo-2-4-3-4-6-7-8-9or lb2.4-3-4-6-7-8-9. When we're stock piling and reclaiming, the proce dure is la-2-4-3-4-5-4-6-7-8-9 ond its equivalent for water shipments. Matty Combinations. While these examples are but a few of many possible arrangements, they're enough to show that each system consists of certain basic functions combined to meet specific job requirements and conditions. Fim HANOUNO ANO StQlAOI sowt KCSMiei 1953 Wei HANDUNO AND STOKAOE