Experimental Study And Simulation Of Temperature Distribution In Continuous Carbonization Device Of Rice Husk

Energy is the driving force of today’s industrial development, but in recent years the world energy crisis has become more and more serious, and the energy structure has also undergone a transition to clean energy from fossil fuels. Biomass energy has become the focus of new energy development due to the characteristics of large reserves and reproducible. The reasonable utilization of biomass energy can be realized by biomass carbonization,In order to complete the carbonization process, a reasonable carbonization device is needed,and the carbonization process is directly affected by the temperature distribution in the device.In this paper, a continuous carbonization device is designed. The heat transfer is studied by air drying rice husk. Experiment results show that: the calculation formula of the material handling capacity of the continuous carbonization device was obtained; the distribution of heat absorption and heat release interval under different material handling capacity was obtained and the reliability of equipment design was verified. The main contents of this paper are mainly from the following aspects:1. Experimental device and experimental contentThe experimental device is a continuous carbonization device with a maximum material handling capacity of 11.0kg/h. The total length of the device is 6m, and the material conveying device is a non-helical spiral of pitch 0.12 m. Experiments mainly include feed rate test of carbonization device and heat transfer experiment. The carbonization time and the calculation formula of the material handling capacity of the continuous carbonization device under different material handling capacity were obtained by the feed rate test of carbonization device, on the basis of above, the heat transfer experiment was conducted to investigate the distribution of the temperature of the pyrolysis gas produced by rice husk in the axial direction of the continuous carbonization process under the material handling capacity of 5.0kg/h, 6.5kg/h, 8.5kg/h and 11.0kg/h.2. Experimental results and conclusionsThe calculation formula of the material handling capacity of the continuous carbonization device was obtained by the feed rate test of carbonization device: 2=8.46 mQ ?b ?? ?D ?S ?n, and the temperature difference between inner wall temperature and temperature of pyrolysis gas was obtained by the heat transfer experiment. According to the relationship between the heat supply and the change of the temperature difference, the heat absorption and heat release area of rice husk in the experimental device were obtained, and the areas were mainly concentrated in a certain range which was in the range of 1.667m~2.867 m from the device import. Finally,the relative error of the heat transfer coefficient is obtained by calculating, and the error is within the allowable range, which shows that the design is reasonable.3. Temperature distribution simulation of continuous carbonization deviceThe pyrolysis gas temperature distribution of the continuous carbonizing device was simulated by Fluent15.0, and the simulation results were compared with the experimental results, the comparison results show that the deviation was very small. So it shows that the Koufopanos biomass pyrolysis model can better describe the carbonization process of rice husk in the continuous carbonization device, and this simulation method can be used to guide the design of the equipment.