Demonstrating the Noise Control of a Coal Preparation Plant. Volume I. Initial Installation and Treatment Evaluation.

摘要

A coal preparation plant was selected to demonstrate various noise control techniques and materials in a commercially operating plant. At the start of the project,the 1,650-ton-per-hour (tph) plant was surveyed to document the existing sound levels and worker noise exposures. On the basis of the survey,individual noise sources were characterized and assigned priorities for treatment. Four categories of noise control treatments were installed in this plant:resilient impact pads,curtains,chute liners,and resilient screen decks. Currently (1977) available resilient impact pads and curtains were suitable for general use in coal preparation plants,and they provided significant noise reduction (6to 10dB(A)). The overall performance of the chute liners,which also provided useful noise reduction,was strongly dependent on the specific installation. Although the resilient screen decks have the potential for 7to 9dB(A) of coal/screen impact noise reduction,blinding and delamination (in composite decks) encountered at the Georgetown Plant represented major design problems for these products. This program achieved noise reductions up to 10dB in various areas of the plant (within the restrictions imposed by the plant's operation) resulting in significant reduction in worker noise exposures.