Double Cone Rotary Vacuum Dryer



Product Overview

The double cone rotary vacuum dryer is a double-tapered rotary tank. When the tank is in a vacuum state, steam or hot water is passed into the jacket for heating. The heat contacts the wet material through the inner wall of the tank, and the water vapor evaporated after the wet material absorbs heat is drawn away through the vacuum exhaust pipe by the vacuum pump. Since the tank body is in a vacuum state, and the rotation of the tank body continuously turns the material up and down, the drying speed of the material is accelerated, the drying efficiency is improved, and the purpose of uniform drying is achieved. Avoid agglomeration and agglomeration of certain materials during the static vacuum drying process.

The double cone rotary vacuum dryer system is mainly composed of double-tapered rotary vacuum dryer, condenser, dust collector, vacuum exhaust system, heating system, cooling system, electric control system, etc.


Product Introduction

The double cone rotary vacuum dryer is a drying equipment integrating mixing and vacuum drying. The process of vacuum drying is to put the material to be dried in a sealed cylinder, and use the vacuum system to draw a vacuum while heating the material to be dried continuously, so that the water inside the material diffuses to the surface through the pressure difference or the concentration difference, and the water molecules (or other Non-condensable gas) obtains sufficient kinetic energy on the surface of the material, diffuses into the low-pressure space of the vacuum chamber after overcoming the mutual attraction between molecules, and is pumped away by the vacuum pump to complete the separation from the solid.

Product Application

This machine is suitable for vacuum drying and mixing of powder and granular materials in medicine, food, chemical industry and other industries, especially for materials with the following requirements:

1, heat sensitive materials that can not accept high temperature;

2, materials that are easy to oxidize and dangerous;

3, materials that needs to recover the solvent and toxic gas;

4, materials with very low residual volatile matter content;

5, materials that are fully mixed and uniform.

Product Features

(1)During the vacuum drying process, the pressure in the cylinder is always lower than the atmospheric pressure, the number of gas molecules is small, the density is low, and the oxygen content is low. Therefore, it can dry easily oxidized medicines and reduce the chance of material contamination.

(2)Since the temperature of moisture in the vaporization process is directly proportional to the vapor pressure, the moisture in the material can be vaporized at low temperature during vacuum drying to achieve low-temperature drying (water content ≤0.5%), especially suitable for the production of medicines with heat-sensitive materials.

(3)Vacuum drying can eliminate the surface hardening phenomenon that is easily caused by normal pressure hot air drying. This is because the pressure difference between the inside and the surface of the vacuum drying material is large. Under the action of the pressure gradient, the water quickly moves to the surface and there will be no surface hardening.

(4)Due to the small temperature gradient between the inside and outside of the material during vacuum drying, the moisture can be moved and collected independently because ofreverse osmosis, which effectively overcomes the loss phenomenon caused by hot air drying.

(5)Drying in a vacuum state enables a higher drying rate at a lower temperature, which is 2 times faster than the general drying equipment, high heat utilization rate, and energy saving.

(6)Fully enclosed drying, the product has no leakage, no pollution, and is suitable for the drying of strongly stimulating and toxic materials.

Technical Specification

The top angle of the double cone rotary vacuum dryer is 90°~60° (depending on the static angle of the material), and the filling rate of the material is 30%~50%.

The rotary speed of the equipment is generally determined as N≤42.3D½r/min (D is the maximum turning diameter).

The heat transfer coefficient U of the jacket has nothing to do with the operating pressure. For non-cohesive materials, U=116~140W/(m²·K), and for cohesive materials, U=80~93W/(m²·K). The heat transfer area is calculated based on the area of the material contacting the cylinder wall.

The cylinder of the dryer is designed according to the pressure vessel, the inner cylinder is subjected to external pressure, and the outer cylinder is subjected to internal pressure.

ModelVolumeHeating AreaMotor PowerPriceDimensions(mm)Weight

Remarks: 1. The above quotation does not include tax, including freight and packaging

  1. For materials with large volume changes before and after drying, the loading coefficient can be increased appropriately.
  2. If customers have other requirements, we can design and process separately.

Operation Procedures

1.Check before driving:

  • Turn on the vacuum pump to check whether the pipe connections and stuffing box are leaking, whether the inlet and outlet ports are well sealed, and whether the vacuum gauge is sensitive.
  • Open the cooling water valve and check the connection of the heat-carrying pipeline, whether the filling port is leaking, and whether the pressure gauge is sensitive.
  • Check whether the instruments, buttons and indicator lights of the electric control cabinet are normal, and check whether the grounding wire is good, whether there is leakage or short circuit..
  • Fill each oil cup with grease, and the starter motor runs empty. Listen to whether the noise is normal. If it is not, check the source of the noise and eliminate it.

2.Put the materials needed to be dried into the container (powder, fine granular and slurry materials are fed by vacuum), and then close the feed hole cover.

3. After closing the vacuum valve, open the vacuum pump, so that the drying container is negative pressure (600-755mmHg).

4.Turn on the power switch, start the motor, press the working button, and the dryer starts to rotate.

5.Open the heating medium valve, let the heating medium enter the interlayer of the drying vessel, and test according to the process requirements.

6.After the material has been dried, close the heating medium valve first, and then pour cooling water into the interlayer. After the material has cooled to room temperature, stop vacuuming. Turn on the vacuum valve, turn off the motor, stop the dryer from rotating, and open the hole cover to discharge the material.


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