Design And Theory Research Of The Condensation System For Biomass Pyrolysis Gas

With the sustainable development of the economic construction, China’s problems of energy security and environmental pollution are becoming more and more serious. Nowadays, the amount of oil imported from abroad is close to300million tons and the carbon dioxide emission load is more than10billion tons in our country every year. But as an agricultural and forestry country, the waste biomass resources are so abundant that at least600million tons of agroforestry wastes need to be used every year. Researching and developing the technology of manufacturing bio-oil which can replace the oil in some certain fields is one of the most effective ways to utilize the agriculture and forestry wastes deeply. There are lots of practical significances to make up for the shortage of oil and save the national energy security.It is the key technology that can condense and liquefy the gas in the fast pyrolysis of biomass industry. In order to reduce the energy consumption of equipment operation and pull up the trait and yield of the bio-oil, it is necessary to reinforce the effectiveness of condensation and liquefaction of the pyrolysis gas of biomass because it is depended on the experiment in designing these equipments.According to the above problems, this paper discusses the technology and craft about how to condense and liquefy the high temperature pyrolysis gas of biomass by the way of contacting with normal temperature bio-oil directly on the basis of design of hybrid condensing heat exchanger through researching and collecting a lot of literature review about the design theory and method of various condensation and heat exchange device at home and abroad. This paper comes up with the design method, steps and related parameters and their values of condensation heat transfer system based on this technology and craft so the way will be researched that designed the condensation heat transfer system about annual output of ten thousand tons of bio-oil. The computational fluid dynamics code Fluent will be used to check the related performance of this cooling unit. The results show that the proposed design method is feasible. The condensation heat transfer in a designed system could be tried to apply in engineering practice. Finally, design and develop a complete set of fluid conveying and electrical control subsystem for condensation heat exchange system in accordance with the design principle of these two subsystems respectively.