The Design And Theoretical Study Of Biomass Pyrolysis Oil Heat Carrier High-speed And Efficient Heating Device

Shortage of petroleum resources in China is a known fact, energy security is outstanding, the situation is extremely serious. By2020the national oil demand will reach560million tons, external dependency will rise to more than65%. Moreover, As a large agricultural country, China has rich agricultural waste biomass resources, but due to lack of advanced, high efficiency, low cost, can use commercial development of technology, every year there are about400million tons of straw,300million tons forest waste and300million tons of shrub biomass resources are wasted. Meanwhile, the environmental problems that we currently facing become increasingly prominent and severe. In particular, more serious fog and haze appeared across the country this year, causing people to pay more attention to environmental issues. Therefore, to accelerate research and exploration of the technology that can economy、quickly and efficiently transform the huge amount of waste agricultural and forestry residues into oil bio-fuel that can substitute oil on a certain level is a major realistic problems that we should solve on energy, environmental protection and sustainable development, and has great significance on economic energy, security, and the development of sustainable.Based on the national863issue "ramp trough low power precision control heated biomass fast pyrolysis bio-fuel and hybrid emulsion made of new technology," this article conduct systematic research on biomass fast pyrolysis bio-fuel equipment’s key technologies-heat carrier high-speed heating.Improving the system of biomass pyrolysis bio-oil heat carrier’s heating rate, heating efficiency and heating energy utilization.Based on the theory of heat transfer, and by analyzing the heat transfer during the serial composite heat carrier high-speed heating device, respectively establish a thermal differential equations and heat transfer model to metal pipe heating device, flue gas flow and the furnace, and for theoretical calculation and structure design of the device, design a suitable biomass pyrolysis bio-fuel production line speed tandem composite heat carrier heating device, in order to achieve heat carrier’s high-speed heating and at the same time can improve the utilization ratio of the device heat technology. Conducting an detection experiments on the device’s thermal efficiency, results show that series of composite heat carrier heating thermal efficiency can reach75.25%. with an average thermal efficiency of75.09%, meet the biomass pyrolysis oil process requirements.Based on FLUENT fluid analysis software for the tandem compound heat carrier heating device within the upper and lower furnace temperature field, pressure field and velocity field is simulated, combining with the device to heat carrier heating multiple physical factors, to carry on the grid, then solve the model, the physical model, turbulence model, boundary conditions, the iterative calculating the initial conditions and parameters Settings. By gas-solid coupling analysis, and respectively calculate the upper and lower temperature field, pressure field, velocity field inside the furnace body are mainly distributed on the cloud, furnace temperature testing point under the temperature variation curves, three furnace heat carrier trajectory curve and temperature change. Simulation test results show that the highest tandem compound heat carrier high-speed heating device heat carrier can be heated to873k. Using the basic principles of genetic algorithms, the series of composite heat carrier furnace heating device on the heating surface has been optimized to improve.This paper design and manufacture three different types of burners with the fuel of straw gas, non-condensable gas, bio-fuels; select straw gas burner as the experimental model, meeting the heat demand of tandem compound heat carrier high speed heating device; using five hole probe to test the straw gas burner exit velocity field, analyze the speed of the export of burner flow field, and research different swirl vane Angle effect on the velocity field. The results showed that the use of the burner outer cyclone from DC form the combustion burner has improved significantly.