Design And Simulation Analysis Of Large Scale Livestock And Poultry Sewage Stirring Fermentation Equipment

With the rapid development of animal husbandry and aquaculture in China,the pollution problem is becoming increasingly serious.The closed fermentation technology of thermophilic aerobic microorganisms is currently recognized as an important treatment method for harmless,reduced,and resource utilization of livestock and poultry manure,with broad application prospects.Currently,China’s animal husbandry is developing towards large-scale and high-end refinement,and there is an urgent need for large-scale and intelligent closed fermentation processing equipment.Therefore,this paper focuses on the design and simulation of key components of a115m3 large capacity closed high-speed fermentation equipment,as well as research on robust control technology.The specific research content of the paper is as follows:(1)Overall design of high-temperature aerobic fermentation equipment.Determine the functional requirements of the equipment based on the principle of high-temperature aerobic fermentation,influencing factors,and process flow.Based on functional and production requirements,technical indicators of the equipment were developed,and the overall layout design of the equipment was completed,as well as the conceptual design of the mixing ventilation system,transmission system,and control system.(2)Design and simulation optimization of mixing ventilation system.First,complete the design of the fermentation tank according to the capacity and pressure requirements of the fermentation tank.Secondly,based on FLUENT and Workbench,the selection of mixing blades and the design of inclined blades were completed,as well as the design and simulation verification of the spatial layout of the blades.The structural layout scheme of two-layer single blade propeller,two-layer double blade propeller,and three-layer triple blade propeller was determined from top to bottom.Then,with the aid of finite element analysis,the connection between the blade and the mixing shaft is simulated and optimized,and the disk support plate is used to improve the anti breaking ability.Finally,the design and calculation of the vent hole are completed.(3)Design and dynamic simulation of transmission system.Based on the requirements of high torque,low rotational speed,and intermittent mixing,the intermittent hydraulic transmission system is designed,including the design of key components such as ratchets and pawls,as well as the selection and calculation of hydraulic cylinders.Using ADAMS software,dynamic simulations of pawl displacement,velocity,and piston rod displacement were performed to verify the rationality of the design.(4)Design and development of fuzzy control system.Firstly,mathematical models of temperature,humidity,and oxygen content were established.Then,taking temperature control as an example,the research of fuzzy control algorithm and the development of fuzzy PID controller are carried out,and simulation verification is carried out using MATLAB software.Then,based on the Siemens S7-300 CPU 315 controller,the design and development of the entire machine control system were completed.Finally,fermentation experiments and tests were conducted on the designed tower fermentation equipment.The results show that all indicators of organic fertilizer meet national standards and can well meet current social needs.