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为了能从众多多效蒸发流程中快速准确地筛选出能耗最低的最佳流程,建立了筛选多效蒸发最佳流程的新方法——矩阵法。新方法将多效蒸发系统中的物料衡算和热量衡算非线性方程组描述成矩阵方程,当流程或节能措施改变时,无需重新推导数学模型,只需将矩阵方程中的若干参数重新赋值,模型就能模拟并流、逆流、各种形式的错流、平流和平错流,还能模拟上述流程有或无蒸汽喷射式热泵技术、引出额外蒸汽预热原料液、冷凝水闪蒸和溶液闪蒸的各种情况,从而快速准确地筛选出最佳流程。浓缩菠萝汁的三效蒸发系统的模拟筛选结果表明:不采用任何节能措施或仅采用冷凝水闪蒸或仅采用蒸汽喷射式热泵技术时,最佳流程是逆流;同时采用蒸汽喷射式热泵技术、引出额外蒸汽预热原料液和冷凝水闪蒸的并流流程最佳,其节省的生蒸汽消耗量高达42.77%。矩阵法是筛选多效蒸发最佳流程的新方法,具有通用性强、效率高、速度快且准确等突出优点。
In order to quickly and accurately select the best flow with the lowest energy consumption from many multi-effect evaporation processes, a new method of screening the best flow of multi-effect evaporation is established, which is the matrix method. The new method describes the material balance and calorific value non-linear equations in a multi-effect evaporation system as a matrix equation. When the process or energy-saving measures are changed, it is not necessary to re-derive the mathematical model, just reassign some parameters in the matrix equation , The model can simulate cocurrent, countercurrent, all forms of cross flow, advection and staggered flow, and can also simulate the above process with or without steam jet heat pump technology, lead extra steam to preheat raw material liquid, condensed water flash and solution Flashing a variety of circumstances, in order to quickly and accurately filter out the best flow. The simulation results of the three-effect evaporation system of concentrated pineapple juice show that the best flow is countercurrent without using any energy-saving measures or using only condensate flashing or steam jet heat pump technology. At the same time, steam jet heat pump technology is adopted, Lead extra steam Preheat raw material liquid and condensate flash and the best parallel flow process, the saving of raw steam consumption up to 42.77%. The matrix method is a new method to screen the best process of multi-effect evaporation. It has the advantages of high universality, high efficiency, fast speed and accuracy.