Drying Substances

Synopsis

Drying substances takes the important part in process engineering. It helps in cleaning, producing, shipping and etc. parts of process. Most dryers are heated by air, which removes the moist vapors. The temperature of ambient air is controlled by thermostat. Air flow can be also controlled by control panel. Tray drier that is used in this experiment works following way: the air the bottom of the chamber below the trays and then rises, through the trays of substance being dried, and exits from an opening in the top of the chamber. The students looked at the process of drying the wet sand and needed to find out effects of drying flowrate, temperature and sand size. It is quite long experiment. Students recorded every 5-10 minutes the temperature of wet bulb and dry bulb temperature and also every time red the weight of drying sand. Theoretically part of experiment consists two graphs: The moisture content of wet sand vs. Time of drying and Drying rate vs. The moisture content of wet sand. Each graph takes the important roles in calculation part of the experiment. This report will discussmain points in illustrating the theory results have been done by the records taken during the experiment.

Content

Synopsis………………………………………1

Introduction……...……………………………………………………………………………………………………………………………………3

Theory……………………………………………………………………………………………………………………………………………………3

Experimental technique…….……………………………………………………………………………………………………………………4

Tables and Charts……………………………………………………………………………………………………………………………………4

        Experiment A…………………………………………………………………………………………………………………………….5

        Experiment B…………………………………………………………………………………………………………………………….7

        Experiment C……………………………………………………………………………………………………………………………9

        Experiment D…………………………………………………………………………………………………………………………….11

        Experiment F…………………………………………………………………………………………………………………………….13

Discussion and Calculation………………………………………………………………………………………………………..……………17

Working on errors………………………………………………………..…………………………………………………………………………21

Conclusion……...………………………………………………………………………………………………………………………………………21

Introduction

In a process industries to yield a solid product from wet material engineers use drying process. Drying is the process of isothermally removing volatile substances. There are not considering any mechanically method for separating a liquid from a sold product. Several types of dryers are used in different fields and specialties. The common type of dryer in many industrial applications that involve drying operation is tray dryers.