【作者】 汪莹莹；

【导师】 肖波；

【作者基本信息】 华中科技大学 ， 环境工程， 2006， 硕士

【摘要】 在化石燃料日渐枯竭的今天,寻求有效的替代能源,是世界各国面临的严峻现状。生物质燃料作为一种古老的能源方式,由于其可再生、储量大以及对环境友善性的优点,再次受到能源工作者的重视,研究能提高生物质燃料利用效率的能源技术成为此项研究的重点。生物质热解气化技术,具有能将生物质原料转化为可燃气、产气的利用效率较高、适用范围广泛等优点,成为众多新型能源技术中的研究热点。基于高温烟气加热的生物质热解气化炉,是华中科技大学清洁生产实验室自主研制的新型生物质能源利用技术。原理是利用在炉体燃烧室中进行的生物质燃烧过程产生的大量热能,通过各烟气列管将该部分热量传递给在热解气化室内的进行热解气化反应的生物质原料,保证其反应的顺利进行。此项技术为综合利用生物质能源提供了良好的示范作用。为了解该新型基于高温烟气加热的热解气化炉运行时的工作状况,采用理论、实验研究与计算流体动力学数值模拟相结合的方式,在实验室电炉热解梧桐落叶实验与尺寸为0.48m×0.48m×1.60m的采用烟气加热方式的热解气化炉热解粗破碎梧桐落叶的中试实验获得的原始数据的基础上,运用CFD计算软件模拟该热解气化炉内部温度场,模拟结果与实验结果相吻合。结果显示:该炉型热解气化室内部温度分布合理,稳定的高温段分布较广,能为生物质的热解气化提供必要的热能。在此基础上,进一步模拟了炉体改进为连续进料时的热解室内部温度分布情况。最后,对该炉体的结构和运行状态的改进提供了几点意见。更多还原

【Abstract】 Today, the fossil energy is drying up, looking for an effective new substitute energy is an important thing facing to the countries around the world. Biomass is an age-old energy, provides with advantages of regeneration, huge reserves and environment friendliness. And it be take seriously again by the experts in the area of energy. The most important thing in the research of biomass use is to improve the efficiency. The technology of biomass pyrogenation can make gas from biomass, which has high effective of the utilization and extensive use area, becomes the hotspot of the research for new energy technologies.The gasifier for biomass pyrogenation, heating by high temperature smoke, is a new technology of biomass pyrogenation, which is designed by the cleanliness production lab of HUST. The energy from the combustion in the burning reactor, which is pass through the smoke standpipes, can be provided for the biomass pyrogenation in the pyrogenation reactor. This technology is a favorable example for using biomass integrated.In order to realize the state of the new gasifier utilizing high temperature smoke heat up, the combination of theory, experiment and computational fluid dynamics was applied. By using the computational fluid dynamics and the data from the pyrogenation experiment of the phoenix tree leaves heating by electric cooker and the new gasifier, size is 0.48m×0.48m×1.60m, utilizing high temperature smoke heat up, it simulated the temperature field in the reactor. The results of the simulation show good agreement with experimental data. The numerical results also show that the temperature in the reactor was distributed suitably, the range of high temperature was wide, it can provide adequate energy for biomass pyrogenation. At the same time, it simulated the temperature field in the reactor when it was circulated continuously, which was in favor of ameliorating the gasifier. At last, it gives some advices for equipment amelioration and the running state optimizing in the future更多还原