Research And Design Of The Measurement And Control Platform For Photobioreactor

Microalgae organisms have shown very good application prospects in the food industry,animal feed,environmental governance,biofuels,etc.,and have attracted widespread attention from all over the world.However,microalgae cultivation and amplification technologies have always been difficult points in the industrial production process.,The study of photoautotrophic microbial cell factories has become a research hotspot of bioengineering technology today.The cultivation and amplification of microalgae cells are generally carried out by photobioreactors.However,because the cultivation of microalgae is closely related to temperature,p H,turbidity,light and other factors,there is a strong coupling between these factors.It is difficult to accurately obtain the relationship between the parameters.Especially in industrial production,the capacity of algae liquid is large,and the parameter values of different positions are very different.The optimized parameters obtained in the small batch cultivation process in the laboratory cannot be directly applied.It is urgent to design the measurement and control of the photoautotrophic bioreactor in the pilot stage.The platform collects data for the industrialized cultivation of microalgae cells and lays the foundation for optimized cultivation.This project is a sub-project of the "Advanced Technology" orientation project of the National Key R&D Program,which realizes the design of the photobioreactor measurement and control platform.Under the unified arrangement of the project,this paper designed a photoreactor platform that can hold 250 L of algae liquid.The platform uses a combination of pipes and reaction columns,both of which use high-transmittance boroglass to increase light transmittance.The application of pipes is mainly to increase the capacity and increase the light-receiving area of the algae liquid.Under the guidance of industrialized cultivation goals,The sensors,centrifugal pumps,motors,control devices,etc.used are all industrialized equipment.According to the basic requirements of algae liquid culture,the platform equipment is divided into three parts: cultivation module,detection module,and control module.The equipment requirements of each module are discussed separately,and the power requirements of the reactor are analyzed and calculated,which is the energy efficiency of the project.The analysis provided a scientific basis.On this basis,a variety of detection sensors and PLC control devices were selected,and a photoautotrophic bioreactor was successfully built.According to the control requirements,the photoautotrophic bioreactor platform is divided into five parts: gas,liquid circulation module,light control module,temperature control module and main control module.Each module is connected by MODBUS bus.At the same time,we conducted in-depth exchanges with bioengineering technicians,familiar with their operating procedures and usage habits,and designed relevant control software and man-machine dialogue interface to facilitate scientific research personnel to use the platform to collect the required data,and focused on the discussion of the tracking platform design.Finally,the designed platform was tested,the test plan and test process were designed,and the corresponding test results were obtained.All functional indicators can meet the design requirements,and the design of the photoautotrophic bioreactor measurement and control platform was realized.The future work is prospected,and the next step will be further discussions with relevant bioengineering experts to design optimized control algorithms.