随着石化能源的日趋紧张,国外一些发达国家在上世纪末就已经开始了关于生物质能源综合利用方面的研究,比如,德国在政策支持下,通过利用秸秆牧草、畜禽粪便,建立了遍布全国的沼气工程,截止到2004年为止,建立了超过2000家的沼气工程。国外对干法发酵技术的研究起步较早,并且德国巴伐利亚州研发出了商业实用技术。美 With the petrochemical energy becoming more and more tense, some developed countries in the world have already begun to study on the comprehensive utilization of biomass energy at the end of the last century. For example, Germany, with the support of policies, has established a nationwide network of livestock waste by using straw pasture and livestock manure, Of biogas projects, as of 2004, has established more than 2,000 biogas projects. Foreign countries on the dry fermentation technology started earlier, and Germany Bavaria developed a commercial and practical technology. nice