Simulation And Application Of Biobutanol Distillation Process Based On Simulation Platform With Independent Intellectual Property

In recent years,the issue about the quest for fossil fuel alternatives,as the demand for renewable and alternative energy increases,has attracted many attention in all over the world.Biobutanol,with super physico-chemical properties,is one of the ideal liquid fuel to replace fossil fuels.On the one hand,however,there are problems,such as the energy requirement and economics,with biobutanol distillation process;On the other hand,the dynamic characteristics of technological process is too sophisticated to understand.Therefore,biobutanol distillation process can’t be widely used in practical production.This paper researches and discusses on biobutanol distillation process.The main content of this paper is as follows:1.The TCD process and E-TCD process were simulated by using DSO simulation system,a simulation platform with independent intellectual property.At first,the thermodynamic models were compared,and the NRTL modle was used to calculate the basic physical and thermodynamic properties;And then,dynamic model of decanter and distillation column were established in the simulation system,which we used to analyse dynamic characteristic of TCD process and E-TCD process.With the increase of running time,ethanol was gradually cumulated in the TCD loop,according to the simulation.But the ETCD process will reach a new stable operation state in 230 hours,2.The study,based on dynamic simulation,design a basic structure for ETCD process,to eliminate the negative influence of the disturbance.According to the dynamic characteristics of the basic structure,the control scheme was optimized,and two improved control structure are proposed.The three control schemes were compared using the system error square integral function,under±10%feed flow disturbance.The simulation results show that,three control schemes can ensure that the E-TCD process quickly responds to fluctuations in feed flow.The improved control scheme 2 shows the best control performance.Compared with the previous two control structures,its integral of squared error is reduced by 84.6%and 12.5%.3.In order to learn about how the total concentration and composition ratio of the feed in the ABE distillation process affect the energy consumption and Technol-economic of different processes,the study investigated concentration and composition data of ABE in-situ separation products reported in the literature in recent years,and statistical tools were used to fit the data.Four representative total concentrations and composition ratios were selected as the feed data used in the study.4.The steady-state process simulation tool was used to simulate the three ABE distillation processes reported in the literature.At the same time,a cost estimation model was established to evaluate the process under different feed conditions.simulation results show that the economic performance of process 3 is poor,and when the proportion of acetone in the feed is high,the total annual cost of process 2 is 0.037～0.126·106 US $/yr lower than that of process 1,andthe proportion of acetone in the feed is low,process 1 saves 0.026～0.044·106 US $/yr compared with process 2.The conclusion is that,a suitable separation sequence in actual production should be selected according to the composition of the product.