| A lot of problems about recycling waste cutting fluid in the wafer cutting links with wafer cell manufacturing process was investigated experimentally.The current condition of photovoltaic cutting was summarized systematically in this paper.Polyhydric alcohol is the main liquid components in the cutting fluid. Separate the mixed polyols refinement will have high economic value added and market development prospects. By comparison,the method of continuous vacuum distillation using three towers was proposed.Combined with orthogonal experiment design method for the three-tower continuous vacuum distillation process by using Aspen plus software.The effects of theoretical plate number, feed location, reflux ratio and operating pressure on continuous decompression distillation simulation were discussed.The Simulation results illustrate the optimum operation region and energy saving effect.Under optimum conditions,the purity of the separated ethylene glycol was99.45%and the yield is92.30%, as well as the purity and yield of di-ethylene glycol and tri-ethylene glycol were high. Requirements of industrial grade products were reached.According to the technological parameters of the previous study,the design of ethylene glycol distillation column was completed, the design has identified the plate number, the structure of the tower diameter, tower plate, plate concrete structure and related process calculation.Using fluid mechanics calculation and gas-liquid phase operation load, illustrate the sieve plate tower of the design is feasible and reasonable.This design provides a theoretical basis for the tower equipment industrial design. |
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