The Study On Techno-engineering And Technical Economic Analysis Of Bioethanol Production From Corn Stalks

Energy is a kind of natural resource which supply energy for humanbing, and it is the material foundation for human living and society developing. Following the low carbon economy wave in recently years, most countries established their developing plan for regenerable energy, and supply special fund to promote technology and industy development of regenerable energy. Biomass energy is the largyest regenerable energy source in the world,and in the research and exploitation system of biomass energy, fibre ethanol technology has became an important economy carrier supported by publication,governments and corporations, at the same time, it is the basic platform and important channel to realize biomass refine developing in future.Cellulosic ethanol technology industry is an exploring and optimizing process Though there have gaining continuing technology developing in fibre ethanol research field, and about 40 middle pre-production trials have built on the base of different technologies in the world, fibre ethanol industry is still on the primary stage of industry production, the developing actualities of cellulosic ethanol shown that there are key technologyies which restrict fibre ethanol industry transforming need to be resolve now.This task was based on the three phases of straw cellulosic fuel ethanol middle engineering test demonstration study, took the key technology of raw materials pretreament, production technic transform to engineering, and process economics study as main studing. Phasely conclusions and fruits for the study were given as follow:(1)The design thought of two methods of steam explosion and dilute acid combined action to pretreat raw materials was drawn out after compared middle engineering tests operating in the world now, and then materials and supplies calculation of middle engineering tests with the capability of 300t straw every year was achieved, technical parameters of the main equipments were radicated, equipments design, machining,fixation and shakedown test were systematicly been done,the basic study base of the middle engineering tests was accomplishhed. (2)with the pilot production demonstration line of 300t/a,the experiment and runing of two kinds of pretreatment technic to deal with corn straw were accomplished. The results of dilute acid pretreat experiment shown that saccharified ratio reached 50.5%,ethnol concentration reached 23.1g/L, and ethnol recovery reached 82.5%。(3)with BOX-Behnken design, the technics mathematical model which took total saccharified ratio as respond was set up by answer side analytical method,and technics optimize simulation was accomplished by the model,better total deoxidize sugar dates gained by the experiment. The experiment dates shown that pretreatment corn straw by vapour blast at the condition of pressure maintain 227s,vapour pressure keep 3.08Mpa,and ammonium acid carbonate concentration keep 2.11%, the total deoxidize sugar concentration could reached 60.04g/L.(4)Pretreatment corn straw by steam explosion could produce better effect than dilute acid.In the dates of the experiment pretreatment corn straw by vapour blast,saccharify got 53.5%,ethanol concentration got 24.8g/L,and ethanol recovery ratio got 82.9%. TGA, XRD and SED methods were integrated to study the physical and chemical characteristic of corn straw after vapour blast.the results shown that vapour blast pretreatment have depressed cellulose rime distinctnessly.(5)The new useage of corn straw residue was explored. corn straw residue could be used as waterproof material, that could enhance additional profit of corn straw residue which had been used to produced ethnol fuel.Been added 10～11% corn straw residue, the producing cost of waterproof material could depressed 8～9%,and the water proof ability enhance 8.1%, the the extensibility under maximum pulling enhanced 0.92%,the pulling keep rate was 3.5% higer than comparison dates.(6)The factors affect energy consume in the two pretreation methods were been emphatically analysed.thermodynamics equation of steam explosion process was built, and factors affect energy consume of vapour were analyzed.that could supply reference for the optimization and amplification of steam explosion equipment.the experiment results shown that the total energy consume of steam explosion was 1027.7MJ/t less than dilute technology.