玉米燃料乙醇低能耗工业生产新工艺

Low-energy Consumption Technology for Industrial Production of Corn Fuel Ethanol

本团队研发的玉米燃料乙醇低能耗生产新工艺,采用了低温液化、浓醪同步糖化间歇发酵、三塔压差精馏与分子筛脱水工艺和全厂各工段的废热进行余热回收技术,目前已经成功应用于多家燃料乙醇生产企业。以黑龙江鸿展生物科技股份有限公司已经投产的30万吨级燃料乙醇工程项目为例,对比分析了新工艺与传统工艺在技术特点、能耗、产品质量等方面的差异。结果表明:与传统工艺相比,新工艺蒸汽消耗降低10.26%,工艺用水量节约28.09%,循环水用量减少11.11%,每生产一吨燃料乙醇折合可节约标准煤49 kg,每年可以为企业节约标准煤14700吨,节省燃料乙醇能耗成本约800万元;同时燃料乙醇和玉米酒糟(DDGS)的产品质量均符合国家标准,部分指标高于国家标准,如乙醇纯度达99.9%,甲醇低至0.01%,DDGS中粗蛋白质为26.1%,粗脂肪为10.5%,粗纤维为8.7%。

The new low-energy consumption process of corn fuel ethanol developed by our team adopted low temperature liquefaction,synchronous saccharification and batch fermentation of concentrated mash,three-tower differential pressure distillation and molecular sieve dehydration process and waste heat recovery technology from various sections of the plant.At present,it has successfully applied to a number of fuel ethanol distillery.Taking the Heilongjiang Hongzhan Science and Technology Co.,Ltd.300000-ton fuel ethanol project as an example,the technical characteristics,energy consumption and product quality were compared and analyzed between the new and the traditional process.The results showed that the steam consumption,process water and amount of circulating water of the new process were reduced by 10.26%,28.09%and 11.11%compared with those of traditional process,respectively.The production of 1 ton fuel ethanol could save 49 kg standard coal;thus 14700 tons of standard coal could be saved annually and the energy consumption cost of fuel ethanol could be saved by about 8 million Yuan.At the same time,the product qualities of fuel ethanol and corn distiller's grains(DDGS)were in line with the national standards,some indicators were higher than the national standards,such as the purity of ethanol could reach 99.9%,methanol content was as low as 0.01%,crude protein content was 26.1%,crude fat content was 10.5%and the crude fiber content was 8.7%.