1、 Design Description of Vacuum Disc Drying Equipment

1. Performance and Scope of Application

The vacuum disc continuous drying equipment designed and produced by our company is a high-efficiency and energy-saving continuous drying equipment that has been improved and innovated based on the absorption of domestic and foreign technologies. Its unique structure and working principle determine that it has high thermal efficiency, low energy consumption, low footprint, simple configuration, and convenient operation and control. Features such as a good operating environment. Widely applicable to product drying operations in industries such as chemical, pharmaceutical, pesticide, feed, and new materials.

2. Working principle and process

Wet materials are continuously added to the feeding hopper of the main machine. The upper electric vacuum ball valve is opened to distribute the materials alternately into the top two material tanks. The vacuum ball valves on the upper and lower parts of the material tanks are alternately opened and closed. The materials are continuously added to the first layer of the drying disc on the upper part of the dryer under the action of the mixing motor. The rake arm with rake blades rotates to make the rake blades continuously flip the materials, allowing the materials to fully absorb heat. The materials flow through the surface of the drying disc along the exponential spiral line. The materials on the low drying disc are transferred to the outer edge and fall to the outer edge of the high drying disc below. The materials on the high drying disc move inward and fall into the lower low drying disc from the middle discharge port. The high and low drying discs are alternately arranged up and down, and the materials can continuously flow through the entire process. Drying machine, with a hollow drying tray filled with heating medium. The heating medium enters the drying disc through one end and exits from the other end. The dried material falls from the last layer of the drying tray to the cooled bottom layer of the shell, and is finally transferred by the rake blade to the discharge port and flows out of the bottom two material tanks. The discharge is rotated by the upper and lower electric vacuum ball valves. The moisture evaporates and evaporates from the material, and is forcibly extracted by a vacuum pump through the upper and lower material tanks. The solvent is condensed by the condenser and collected in the buffer tank, and the moisture is finally emptied.

The vacuum disc drying equipment is suitable for drying thermosensitive materials with very low temperature requirements, such as drugs, vitamins, biological products, enzymes, solvent containing materials, etc. Wet materials are added in batches to a quantitative feeder that can withstand negative pressure. After turning on the vacuum pump to put the disc dryer in a negative pressure state, the materials are evenly added to the dryer through a continuous lock for drying operations. The dried materials flow out from the discharge port at the bottom of the dryer. The moisture escaping from the material is collected by the condenser and solvent receiving tank, and the entire operation process is carried out under negative pressure.

2、 Vacuum disc drying equipment is suitable for materials:

The process of enclosed solvent recovery disc continuous drying equipment is suitable for drying processes that require solvent recovery, and for drying processes where the moisture content is flammable, explosive, or toxic and cannot be directly discharged into high gas, recovery treatment must be carried out. If the moisture content is methanol, ethanol, gasoline, pyridine, petroleum ether, halogenated hydrocarbons, acetone, formaldehyde, etc. On the basis of the basic configuration, add continuous material entry and exit locks, condensers, solvent receiving tanks, and vacuum pumps. The moisture (solvent vapor) escaping from the dryer enters the solvent recovery condenser from the top of the dryer, condenses into solvent liquid under the cooling of the cooling medium, and enters the solvent receiving tank. Non condensable gases leave the solvent receiving tank and are evacuated by a vacuum pump. The cooling medium should be selected based on the characteristics of the solvent, either cooling water or cold salt water.

1 Wet material 2 Quantitative feeder 3 Continuous ball valve feeding 4 Vacuum disc drying equipment 5 Condenser 6 Heating medium in 7 Heating medium out 8 Solvent receiver 9 Vacuum pump 10 Dry product 11 Cooling medium in 12 Cooling medium in 13 Exhaust gas exhaust

3、 Principle of nitrogen replenishment for vacuum disc drying equipment:

The disc type continuous drying equipment for nitrogen circulation environmental protection is suitable for drying substances that are particularly prone to oxidation, flammable, explosive, and highly toxic. On the basis of basic configuration, equipped with solvent condenser, solvent receiving tank, inert gas circulation machine, fin heater, inert gas replenishment tank and other machines. Wet materials are added to the dryer through a continuous lock by a quantitative feeder, and the drying process is completed by moving from top to bottom. The dry material flows out from the bottom of the dryer through a continuous lock, and the moisture escaping from the material enters the condenser from the top of the dryer and condenses into liquid, flowing into the solvent receiving tank. The cooled inert gas is transported to the dryer by a circulation machine, absorbs the moisture of the material, and enters the condenser for re cooling, creating a closed-loop circulation. Before entering the dryer, the inert gas must be preheated by a fin heater, and the inert gas storage tank can replenish the lost nitrogen gas to the system.