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摘要
A new Louisiana Low Turbulence (LLT) juice clarifier has been developed, successfully tested and installed at several sugar factories in Louisiana. The principal difference of the new concept is that the flashed juice is introduced into a trayless clarifier through a network of uniformly distributed pipes. Each pipe has a patent pending turbulence reduction device (TRD) attached to the juice exit point. As a result, both velocity and momentum of juice entering the clarifier are reduced by a factor of approximately 50, compared to parameters in the pipe, and the large-scale turbulent eddies are virtually eliminated. Computational fluid dynamics (CFD) modeling was used to optimize the design parameters. Initial industrial tests were performed at two different plants where 6.1 m diameter clarifiers were installed. The performance of the LLT clarifiers was very favorable compared with conventional designs (Dorr, Graver and SRT) throughout the whole grinding season. A new 7.9 m diameter LLT clarifier has been designed and operated at Lula factory in 2011 in parallel with two Graver clarifiers at one half of residence time. Lower sugar losses were reported as well as an increase of clarified juice temperature. It has been demonstrated that the LLT clarifier could be operated successfully even at high mud levels with the residence time not exceeding 30 minutes. Manufacturing cost was estimated at 35-40 %) of conventional designs. Capital cost analysis, observations and operating experiences are presented.
- 出版日期2013-9
