1. Product overview and usage:
DZLG series spiral vacuum dryer is a high-efficiency, multi-functional, fully enclosed vertical vacuum drying equipment integrating drying, crushing and powder mixing. Its drying efficiency is 3-5 times that of the "Double Cone Rotary Vacuum Dryer" of the same specification. It is mainly used for powder drying in the pharmaceutical, chemical, pesticide, food and other industries. It can realize the entire process of closed and continuous operation. It is the preferred drying equipment for the above-mentioned industries.
2. Equipment process characteristics:
Drying and mixing of powder is an important link in the production of raw materials, so the selected drying and mixing equipment is the guarantee of the quality of the final product, and it is also the key to determining the production and operation cost. The "DZLG Series Single Cone Spiral Vacuum Dryer" newly developed by our company leads the drying technology of the domestic chemical and pharmaceutical industry with its unique structure and absolute advantages.
(1) The selection of the dryer needs to meet the specific requirements and characteristics of various products and processes. Its content is mainly the following aspects:
1. Most of the raw materials processed in the production are heat-sensitive, so material agglomeration often occurs during the drying process, which requires the drying time to be shortened as much as possible and the drying efficiency to be improved.
2. In the production of materials, the purity of the circulating gas used in the drying process will have a great impact on the quality of the materials. The equipment adopts unique gas supply technology to minimize the influence of gas on the drying process. From the perspective of operating economy, it is hoped that all the process pipelines can be fixedly installed, so as to save the rotation space required by similar double cone dryers.
3. In order to make the whole process continuous and reduce the leakage loss of materials at the same time, the solid discharge flow rate of the dryer is controllable. This can reduce the workload of manual loading and unloading in the clean area and prevent the phenomenon of material outflow.
(2) The structure and characteristics of DZLG series single cone vacuum ribbon dryer:
1. The working process of DZLG series single cone vacuum ribbon dryer is intermittent batch operation. After the wet material enters the silo, heat is supplied through the jacket of the cylinder wall and the inside of the propeller, so that the heating area reaches 140% of the entire container area. Perform heating and drying. And choose the corresponding cone-type drying mixer model (working volume) to achieve the ideal drying effect. The hybrid dryer adopting the up-drive structure has the characteristics of high efficiency drying and mixing ability, and at the same time, it has ample space and is more convenient for users to perform maintenance.
2, the operation is stable, and the crystal shape is protected:DZLG series spiral vacuum drying does not use any auxiliary tools in the process of drying and mixing. It only uses the revolution and rotation of the conical stirring spiral, which makes the material not only lifted from the stirring spiral but also continuously cut and dispersed, ensuring the material All materials in the silo can be fully moved, and the materials are not squeezed by any other external force except for the lifting of the propeller, avoiding the ineffective friction between the powder and the equipment and the powder crystal grains. Ineffective friction is often the main factor leading to the destruction of the crystal shape of the material. This is also the fundamental reason why the LZG series spiral vacuum drying can keep the crystal shape of the material intact during the operation.
3. The top drive eliminates the possibility of product contamination caused by the shaft seal:
Using top drive, compared to bottom drive, this device can avoid the following disadvantages:
The stirring paddle must be disassembled with special equipment for cleaning and maintenance
It is difficult for the shaft seal of the stirring paddle to be truly sealed and pollution-free, and lack of quality assurance
4. Low operating energy cost and high mixing efficiency:
DZLG series single-cone vacuum spiral belt drying is driven by a motor and has a unique design. The spiral driven by the motor's operation is used to lift the material, and there is no energy consumption for cutting alone. It is particularly worth mentioning that in the mixing and drying process, the traditional mixing and drying equipment provides a belt-type stirring blade. Its working principle is that when the mixing is moving, the moving material is as a whole, and a large amount of energy consumption is used for the circular movement of the whole material, so the drying efficiency provided by this kind of mixing is low. The LZG series spiral vacuum drying provides a conical spiral stirring. The entire stirring paddle moves in a circular motion around the axis of the conical silo to ensure that the materials in different parts of the entire container can be stirred. In the process, the material at the bottom of the silo is gradually lifted to the upper part of the container, and then it falls naturally, and so on. This mixing mode enables the materials in the container to be fully and uniformly mixed, eliminates the possibility of material agglomeration during the drying process, and greatly improves the mixing and drying efficiency of the materials. Moreover, it has the advantages of a wide range of processing capacity and low energy consumption per unit mass.
5. Simple operation and convenient maintenance:
DZLG series single-cone vacuum spiral belt drying mechanical structure is simple and effective, easy for the operator to understand, simple button control makes the operation process very simple. Some maintenance work can be completed smoothly and quickly even without professionals. The manhole can be easily adjusted and maintained with the moving screw without complicated disassembly. The equipment has very few wearing parts. The drive unit such as the bearing box is set on the top of the silo. The user can easily detach the entire unit during maintenance, and the top drive unit has ample space.
３. Equipment structure features and functions:
1. The equipment uses jackets and spiral ribbons for internal heating, which increases the overall heating area of the equipment by approximately 40%.
2. The single ribbon agitator used in the equipment is a patented product of the company, which can realize the effect of bottom-up circular stirring and obtain high-efficiency forced heat transfer performance. When the material filling rate is 40%~100%, 100% heating utilization can be obtained. Suitable for mixing and drying delicate materials.
3. Fully sealed system, no foreign matter pollution, high cleanliness, especially suitable for mixing and drying of pharmaceutical intermediates and APIs, and also suitable for mixing and drying of sterile APIs.
4. The small gap between the single ribbon agitator and the vessel wall can effectively prevent the material from sticking to the surface of the vessel wall.
5. The use of a small-angle cone-shaped barrel structure makes the discharge speed fast, clean and does not accumulate.
6. Equipped with recoil device:
Dust raised due to the drying of the material during the drying process is adsorbed on the vacuum trap, which blocks the vacuum channel, and the obstruction of the gas channel directly leads to the extension of the drying time. The lower the temperature of the material during the drying process and the shorter the drying time, the less the material quality will be affected. For the above reasons, the single cone dryer developed by our company is equipped with a back-blowing device on the vacuum trap, which can keep the vacuum channel unblocked during the material drying process, thereby ensuring the drying time and drying quality.
7. The bottom discharge valve is a plate-drawing valve, which is reliable in sealing and is conducive to vacuum drying.
8. The equipment has compact structure, balanced operation, good sealing, no lubrication leakage, simple operation and long service life.
４. working principle:
The heating cone is equipped with a heating jacket, and the heat source is hot water, heat transfer oil or low-pressure steam, so that the inner wall of the cone can maintain a certain temperature. The frequency conversion speed motor drives the single spiral belt agitator to rotate through the parallel helical gear reducer, and the animal material is rotated along the cone-shaped drum and lifted from bottom to top. After the material reaches the highest point, it will automatically flow back to the center of the vortex by gravity and inertia. At the bottom of the cone-shaped cylinder, the material is forced to be heated in the cone-shaped cylinder during the whole process, and the heat is diffused in the material by relative convection and mixing, so that the material can make an all-round irregular reciprocating movement, and the material is the same as a single spiral ribbon and cylinder High-frequency heat transfer and exchange on the wall surface can achieve the effect of heating and drying in a short time. So that the water inside the material evaporates continuously. Under the action of the vacuum pump, the water vapor is drawn by the vacuum pump. If the liquid needs to be recovered, it can be recovered by adding a condenser or a recovery liquid storage tank. After the drying is completed, open the lower discharge valve to discharge the material.
