Research On The Automatic Control System For Aerobic Fermentation

In traditional agricultural production,the main control operations of composting include mixing,turning over and ventilation.Generally,keep manually turning the compost pile each specific period to achieve the internal environment readjustment.This manual control method is not only time-consuming and laborious with bad accuracy,but also difficult to collect the environmental parameters of compost pile,which is difficult to get the environmental changes during composting process.At present,aerobic composting reactor has good research potential and application prospect because of its short composting period,small footprint,easy to achieve automatic control and low pollution.Using reactor for aerobic fermentation treatment,combining electrical equipment and mechanical equipment,achieving the process of monitoring control integration,reducing labor expenditure and improving control efficiency,which has significant meaning for agricultural waste treatment and agricultural production.Based on the previous research results,this paper has carried out the following research work:(1)Aiming for the relevant environmental monitoring and control operation in the process of aerobic composting,a lower computer controller of aerobic composting is designed.The device is developed on the ARM7 chip lpc2387,which is connected with the LCD touch screen.The electrical interface of the control equipment,such as agitator and blower,can be connected to the designated interface of the controller.Then,the electrical channel can be activated through the touch screen to achieve the relevant control operation.Take use of touch screen for parameter setting,each control device can be switched between manual control mode,timing control mode,periodic control mode and automatic control mode.Controller connect the sensor equipment to collect the internal environmental parameters of the compost reactor,and display the collected data in the relevant interface of the touch screen.At the same time,send the collected data to the upper computer monitoring software through the wireless device for display and storage.(2)Based on Microsoft Visual Studio 2010,an upper computer monitoring software is developed,which can receive the compost environment data uploaded by the lower computer controller,then display it in the real-time monitoring interface and store it in the local database.In the parameter setting interface,you can set the working mode and equipment parameters of the lowercomputer controller.In the data query interface,you can obtain the corresponding experimental data content from the database by inputting the experimental period and selecting the specific options.(3)Aiming for the aeration operation of the lower computer controller,a ventilation control scheme based on the fuzzy PID control theory is proposed.Through real-time collection of oxygen concentration value in fermentation reactor,oxygen concentration deviation and oxygen concentration deviation change rate are calculated.As both input parameters of fuzzy control algorithm,the optimal control parameters for different composting stages can be solved through fuzzy reasoning,and the ventilation rate of control equipment is adjusted in real time.The composting experiment shows that the automatic control system of aerobic fermentation designed in this paper,which is used together with aerobic composting reactor,has multiple control modes and high degree of automation.It can reduce the human labor in the composting production,improve the production efficiency,and provide some ideas and reference opinions for application of intelligent equipment in the field of agricultural aerobic composting.