Design And Simulation Analysis Of Household Kitchen Waste Degradation Device

Kitchen waste contains very high moisture and organic matter,which is easy to decay and generate odor.It is prone to decay during collection,transportation,and processing,breeding bacteria,and posing a potential risk of spreading diseases.In the treatment of urban kitchen waste,due to the incomplete classification of waste,many recyclable wastes are mixed together for treatment,resulting in waste of resources.In traditional urban waste treatment,kitchen waste is usually buried in a landfill,which not only wastes resources,but also pollutes land and groundwater.Kitchen waste contains a large amount of organic matter.If it can be effectively treated,it can be converted into organic fertilizer through biological fermentation,which is conducive to the reuse and recycling of resources.The treatment of kitchen waste is of great significance to resource utilization,waste reduction and green life.Therefore,according to the characteristics of household kitchen waste and the requirements of organic matter recycling treatment,a household kitchen waste degradation device is designed and analyzed.The main research contents of this paper are as follows:(1)The treatment processes of kitchen waste are compared and analyzed,and the process flow chart of the household kitchen waste degradation device is designed.According to the process flow chart,the scheme design of the household kitchen waste degradation device is carried out.The blade type mixing mechanism is used to mix kitchen waste with the fermentation strain evenly,and the constant temperature fermentation is carried out by wrapping the silica gel heating belt outside the fermentation bucket and then wrapping the insulation cotton.3D modeling of the overall device,and the working principle of the household kitchen waste degradation device was described.(2)In order to ensure that the design of the device can meet the actual work needs,the structure design of the mixing device and fermentation barrel is carried out.By analyzing the load of the mixing device to meet the usage requirements,the parameters of the mixing blades were optimized based on the response surface method.Sensitivity analysis was conducted on the mixing blades,and four size parameters of the mixing blades were selected as the parameters for this optimization design.The mass of the mixing blades was taken as the optimization objective function,and the optimization model was solved using ANSYS.The mass was reduced by 13% compared to before optimization.Conduct modal analysis on the mixing device,and the natural frequency of the improved mixing device is safe.The design of the mixing device meets the design requirements.The fermentation barrel is designed in structure and analyzed in statics,and the design meets the requirements.The calculated thickness of the insulation layer is 3mm,which can effectively ensure the constant temperature fermentation of kitchen waste.The structure of the air purification device was designed,and the ventilation volume in the household kitchen waste degradation device was calculated.(3)A single factor experiment and a three factor and three level orthogonal experiment were conducted using the discrete element method to investigate the factors that affect the dispersion coefficient,such as filling ratio,stirring shaft speed,and number of positive and negative rotations.By designing a single factor experiment,the influence of the parameter changes of each factor on the experimental results is obtained.By designing a three factor and three level orthogonal experiment,the degree of influence of filling ratio,stirring shaft speed,and number of positive and negative rotations on the discrete coefficient under the combined action was obtained.Range and variance analysis was conducted on the obtained experimental results,and the results showed that the number of positive and negative rotations had the greatest impact on the discrete coefficient,while the filling ratio had the smallest impact.The optimal solution was a filling ratio of 0.4,a stirring shaft speed of8r/min,and a number of positive and negative rotations of 1.In order to ensure that the design of the fermentation barrel can meet practical production needs,a mathematical model of thermal convection and steady-state turbulence in the fermentation barrel was established using Fluent software.The velocity and temperature fields inside the fermentation barrel were simulated and analyzed.Comparative analysis found that setting the air inlet and outlet adjacent to each other inside the fermentation barrel can improve the heat dissipation effect.(4)Design the control system of the household kitchen waste degradation device.Using Arduino control board for intelligent control of the entire machine;Select the core hardware of the control system,including temperature and humidity sensors,infrared sensors,relays,and steering gear;Program the opening module,stirring air purification module,and control system interface;In order to ensure the normal operation of the programming and hardware,system testing was conducted on each subsystem of the system to ensure that each system operates normally,(5)In order to verify the optimal structural combination parameters obtained from the above structural design and simulation test,a prototype was made and tested.According to the prototype test results,the degradation rate was 78.2%,the degradation process was shorter than the traditional degradation cycle,and it was suitable for household treatment of kitchen waste.Therefore,the structural design and simulation analysis results met the design expectations.