How to measure the calculation of the belt dryer and how it works

The material enters the drying section by the machine head and slowly dries. The line speed of the mesh belt depends on the type of material and the water content. The speed of the control line is the speed regulating motor, and the line speed is 630-1800/min. After drying, the material is removed from the discharge end (the even layer is discharged by the machine head, and the odd layer is discharged by the tail). During the drying process, due to the action of the fan, the hot air is introduced into the lower part of the inner cavity of the dryer by the inlet duct. Drying is carried out from the bottom up, and then discharged through the air outlet through the air outlet.

The main principle of the mesh belt dryer is to evenly spread the material on the mesh belt. The mesh belt adopts a 12-60 mesh steel mesh belt, which is dragged and moved in the dryer by the transmission device, and the hot air flows through the material. The water vapor is discharged from the wetted hole to achieve the purpose of drying. The length of the box is composed of standard sections. In order to save the space, the dryer can be made into a multi-layer type, and the common one has two compartments, three floors and two rooms. Five layers, length 6-40m, effective width 0.6-3.0m.

In order to get the good drying effect and proper output of the zui, the water content of the material, the linear velocity of the mesh belt, the air distribution volume and the air temperature must be combined properly, reasonably and organically.

Explain how the thermal mass of the mesh belt dryer equipment is measured

The materials and drying media of the inlet and outlet mesh dryer equipment are used as the calculation objects, and the overall thermal quality is calculated for the drying process:

First, the calorie balance of the continuous dryer's heat balance is based on unit time. Intermittent drying equipment is based on a dry cycle. In the case of heat balance, various possibilities should be considered. The actual drying process can be simplified according to the actual situation. In theoretical drying, the gas has a constant enthalpy. The drying process in theoretical drying is an isobaric process.

Second, the quality (material) balance in the drying process to maintain a constant value of the amount of dry air in the wet air flow, and the quality of the dry material into and out of the dryer. The moisture content is equal due to entering and exiting the continuous dryer.

Third, the mesh belt dryer process components:

1. The heater is a dryer. A number of internal heaters are placed in the dryer to allow the drying process to be carried out at a lower air temperature. It reaches the final gas temperature of zui as it is when the air is heated once.

2. Gas heating and drying machine equipment Liquid or gas fuel is directly burned in the dryer, which not only increases the temperature of the gas, but also increases the humidity of the gas generated by the combustion. The water vapor generated by the combustion also increases the temperature of the gas.

3. Mixing of wet air streams In the drying process of partial gas recycling, there is a problem of mixing two kinds of humid air.

4. Theoretical dryer equipment The change of air state in the theoretical dryer can be divided into two stages. * In the stage, the air is heated in the external heater and its absolute temperature remains unchanged. In the second stage, the enthalpy of the air remains unchanged, and the moisture in the material in the dryer vaporizes until the air is cooled to a predetermined exhaust temperature.

5. Continuous dryer for partial exhaust gas recirculation The flow rate of the inlet air is mixed with some of the exhaust gas.

6. Closed-circulating dryer: When the moisture is to be recovered or an expensive inert gas is used, closed cycle drying is used.