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1、第六章 英文翻译英文原文：Chute Design In A Large Coal Handling FacilityDavid Charles MorganT.C.C.(Mech .Eng.)MEMNAcknowledgements: The Bionic Research Institute, Chute Design Conference 1991The paper gives a brief overview of coal handling at the Syferfontein Mine, in the Overland Conveyor System, and in the st
2、ockyards.The criteria for selection of chute design are discussed, and design alternatives evaluated.David Charles Morgan is Projects Manager (Materials Handling) with Keeve Steyn Inc. He is a member of the Institute of Materials Handling, and has wide experience in bulk materials handling and insta
3、llation.REQUIREMENT FOR A NEW MINESyferfontein Colliery is an entirely new open cast mine situated at Trichardt in the Eastern Transvaal. The purpose of the mine is to supplement the coal supply to Sasol II and Sasol III factories at Secunda and will produce coal in conjunction with four existing mi
4、nes in the Secunda area.When fully operational the mine will supply some 7 million tons of coal per annum. This coal will be of a higher grade than that produced from the existing mines and by the mining methods employed, will generate a product with a much lower fines content.To ensure continuity o
5、f product quality to the factories it is necessary to both blend the new mines coal with that of the existing underground mines and to homogenize the product to ensure an even distribution of fines. The control of the production of fines on the new mine and the transport systems has been of paramoun
6、t importance and studies conducted by Sasol on the existing systems have been utilised in the design of the transfer points and the design criteria of the conveyors.MINE OPERATIONCoal is strip mined and transported to the coal preparation plant in trucks with capacities of up to 170 tons. The of min
7、e coal is loaded into a hopper below ground level in the primary crushing building where it is extracted by means of an apron conveyor.-300mm Material is extracted by means of a live grizzly and transported by conveyor direct to the secondary crushing plant. The +300mm material is transported via a
8、second apron conveyor to a jaw crusher where it is broken down to -300mm and dispatched to the secondary crushing plant.Prior to secondary crushing the -100mm product is screened out and the crushing by-passed whilst oversize is broken down to the required -100mm by means of a rotary breaker .Rock p
9、resent in the product at this point is removed by the rotary breaker and discharged by conveyor onto a waste rock pile. The final product now plus fines generated in the mining and reduction process is delivered to a fines screening plant where the desired portion of -6.4mm product is removed from t
10、he final product.Throughput of the mine is such that the handling system and plant is capable of handling 2400 ton/hour of R.O.M coal.A circular stockpile acts as a buffer between the overland transportation system, from which coal may be extracted at 2000 ton per hour.To minimize degradation en-rou
11、te the overland system has been kept to 3 conveyors of which the first is a slow running collection conveyor. Of the other 2 flights, have been selected at 8 km and 12 km respectively to keep transfer points to a minimum and belt sag has been restricted to 1% to minimize degradation of the coal en r
12、oute.A splitter bin at the factory distributes coal to either the Sasol II or Sasol III stockyards. The new system at Secunda consists of an additional 2 slewing stackers and 2 barrel reclaimers, together with a distribution system to the existing stackers and a reclaim system to the factories.Despi
13、te keeping the transfer points to minimum a total of 30 individual transfers occur from the R.O.M. intake hopper at the primary crushing building to the stockpiles at Secunda. Careful design of the transfer points to keep degradation to a minimum was therefore quite essential.Sasols policy is one of
14、 constant improvement and in the process of fixing the conceptual layout many changes occurred both on concept and process requirements. This involved radical changes particularly to the stockyard system from the time of initial conception. This allowed innovative thought to at times complex transfe
15、r stations.CHUTE DESIGNCONVEYOR CHUTEWORKTo achieve the objectives of Sasol and the necessity to keep degradation to a minimum it was necessary to move away from conventional chutes. Various types of transfer were investigated, catering from in-line dedicated discharge through to multi-discharge and
16、 proportioning chutes.Investigations with Sasol showed that the low headroom curved chute with moving head for multi-discharge was the ideal and enquiries and designs were based on this concept. The specification for the chutes being as follows:CHUTE SPECIFICATIONThe elimination of coal degradation in chutes is of paramount importance and the following are factors influencing the design of degradation free chutes:A large c
