Research On Process Control System Of Straw Fermentation Fuel Ethanol

In recent years,with the gradual depletion of fossil fuels,the growing energy crisis and the increasingly serious environmental pollution,biomass energy has become the focus of attention in the field of energy with its huge resources,renewable,low pollution and other advantages.And fuel ethanol is currently the world’s largest production and use of biomass energy,can be used as a vehicle fuel to reduce dependence on oil,In particular,Straw lignocellulose as the raw material for bio fermentation to produce fuel ethanol,in order to achieve efficient use of resources at the same time,to avoid straw waste,incineration and other environmental pollution.But the straw fermentation fuel ethanol has not yet been large-scale promotion,the main reason is the low level of automation,production technology and equipment can not meet the requirements of process control of straw fermentation fuel ethanol.And in the production process,the error and failure is not easy to find in time,resulting in waste of raw materials and equipment idling,seriously restricts the scale and intensive production process of straw fermentation fuel ethanol.Therefore,the research on the ethanol process control system of straw fermentation fuel with good control effect and high automation degree is necessary to reduce the cost of fuel ethanol production,improve the fermentation efficiency and yield.Based on the analysis of the process mechanism and production process of straw fermentation fuel ethanol,using corn straw cellulose as raw material,determine the pretreatment method of mechanical crushing combined with acid fiber blasting,and using the simultaneous saccharification fermentation process which the enzymatic hydrolysis of lignocellulose and fermented sugar are carried out simultaneously.According to the characteristics of nonlinear,time lag and time varying in the process of fuel ethanol fermentation,the main parameters of fermentation process were optimized by intelligent control technology.With the temperature variable as an example,the fuzzy PID algorithm is used to dynamically adjust the temperature of the straw fermentation fuel ethanol,and simulated by MATLAB,the simulation results show that the fuzzy PID has faster response speed and higher control precision than the traditional PID.On the basis of the prediction model of straw fermentation by support vector machine,taking the concentration of ethanol as the optimal target,the particle swarm optimization algorithm was used to optimize the control of feed flow rate.The experimental results show that the method can improve the concentration of ethanol.In order to improve the intelligent level of fuel ethanol fermentation process,an embedded remote monitoring system based on ARM-Linux and GPRS was designed.In the field of embedded monitoring terminal,the AD chip ADS8344 E and DA chip DA8574 are used respectively through the SPI interface and IIC bus to connect with ARM9 microprocessor,system can realize high-speed,multi-channal synchronous data acquisition and output control,and through the GPRS network to upload data simultaneously to remote receiver.In the remote data monitoring center,the B/S architecture based on Ajax to manage the received data,and the dynamic data interaction between Web client and the remote monitoring terminal was realized.The experimental results show that the designing project is reasonable,with high real-time performance and dependability,and that it can have excellent practicability.