Design On Liquidus Temperature Detector Of Aluminum Electrolyte

Liquidus temperature is one of the important physical and chemical properties of the electrolyte,it is also an important reference data for molten salt electrolysis process,grasping the information of the liquidus temperature has a positive effect on improving the current efficiency,reducing the energy consumption and controlling the electrolyzer.Therefore,the study of liquidus temperature is one of the important prerequisites for the development of low-temperature electrolysis process and the development of new electrolytic equipment such as energy saving,environmental protection production.The main purpose of this project is to design a device to measure the liquidus temperature of aluminum electrolyte,this device provides the basis for the electrolytic aluminum production process.Liquidus temperature measurement methods have visual method,thermal analysis,differential thermal analysis method and so on,the step-cooling curve method is suitable for real-time detection and take it as the theoretical basis of this topic.For aluminum electrolysis plant has strong magnetic field interference and a lot of electrolytic cells,design a portable mobile measuring device.Front-end system is only responsible for temperature acquisition,through the ZigBee wireless to transmit data to the data processing unit,data processing unit is responsible for receiving the temperature data in real time,showing the temperature curve,calculating the liquidus temperature and so on,so technicians only need to move the front-end temperature acquisition unit can complete liquidus temperature measurement.This dissertation describes the functional requirements of the liquidus temperature detection device,including collecting accurate temperature data,real-time display of temperature and curve.A variety of technical solutions are proposed for these functional requirements,compare their advantages and disadvantages,and select the most appropriate solution.Design the front-end temperature acquisition unit hardware circuit,build the test platform and debug to improve the hardware system.On the basis of learning embedded systems,Qt application development,write the software code for the data processing unit.In addition,the primary crystallization temperature algorithm is studied,according to the characteristic of step-cooling curve,difference method and density method are used to calculate the liquidus temperature,then use the experimental data which from the field to analysis,finally the temperature density method is employed.Finally,the signal generator is used to simulate the thermocouple signal to demonstrate and test,and increase the noise in the signal,analysise the experimental results.System test results show that user can accurately complete aluminum electrolyte liquidus temperature measurement through the device.