Tham khảo tài liệu 'steam power by mike brown_11', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Simpo PDF Merge and Split Unregistered Version - http MIL-HDBK-1003 7 separate compartments with each compartment provided with a large hatch cover. Hatch covers are moved to the open position by means of cables attached to the unloader bucket. These cables are also used to lower a bulldozer into each compartment for final cleanup of coal. The unloader boom may be extended on both sides of the tower structure which allows the unloader to be used also for coal reclaim from an onshore stockpile. The boom may also be provided with a movable operating cab which can be positioned to serve at either end of the boom. The unloader bucket is supported by cables from a trolley that moves back and forth along the boom. The unloader mechanism includes a holding hoist to raise lower and hold the bucket a closing hoist that opens and closes the bucket a trolley winch that moves the trolley and a tower drive if the tower is of the movable type . The tower structure supports a machinery house that contains DC motor driven hoisting and trolley movement equipment motor generator sets and electrical control equipment. Coal is dropped into a receiving hopper from which it is discharged to a yard belt conveyor. Coal Crushing. If unsized coal such as run of mine is delivered to the plant a coal crusher must be provided to reduce the coal to uniform lump size suitable for storage and firing or pulverizing. In climates where frozen coal may be a problem a coal cracker for breaking up frozen lumps should be provided on the conveyor system feeding plant bunkers or silos. For additional information relative to coal crushing equipment see MIL-HDBK-1003 6. Coal Storage. Storage shall be as required in MIL-HDBK-1003 6 under paragraph titled Fuel Handling except that the outside storage reserve stockpile shall be designed to store 90 days usage of coal at full plant capacity. Coal Reclaiming. Coal reclaiming is usually done by means of bull dozing the coal from the .
