Determinationofdryingrate.docx

Determination of drying rate1、The experiment purpose Grasp the structure and operation of the moisture tester.Determination of water loss rate curve of wet material under constant drying condition(i.e., hot air temperature, humidity, constant velocity, material and air contact mode).c、Determine the moisture content of the material.d、To master the methods of using measurement and control instruments.Experimental principleWhen the wet material and drying media contact, material surface water began to gasification and transfer to the surrounding medium. According to the characteristics of different drying process during the drying process can be divided into two stages: the stage of constant rate of drying and the drying phase.Factors of constant velocity section drying rate and critical moisture content influence mainly has：types and properties of solid materials、the thickness of the solid material layer or the particle size、air temperature, humidity and air velocity、the way of Relative motion of air and solid materials.The drying rate and the critical moisture content of the constant velocity section are important data for the study of the drying process and the design of the dryer.In this experiment, the sludge was dried under constant drying conditions, and the water content and water loss rate curves were determined.Schematic diagram of the experimental deviceThe annular halogen heater to ensure that the sample at high temperature in the process of testing uniform annular heating, the sample surface is not easy to damage, fast drying, in the drying process, the moisture meter continuously measures and instantly displays the water content of the sample, drying process is completed, the final measured moisture content value is locked and displayed.The experimental procedureThe halogen moisture analyzer is placed horizontally、adjust the front bottom casters、until the bubble is transferred to the circle in the level.Press the ON/OFF key to boot,the moisture meter disp