Double cone vacuum dryer needs to be upgraded

Changzhou Fengneng is a dry and innovative enterprise in the domestic drying industry!

There are many manufacturers of double cone rotary vacuum dryers in China, but the overall design and manufacturing level is relatively low. There is no upgrade to this classic utility equipment (only a few manufacturers in China have upgraded their efforts), the real reason is not Combine the theory to study the performance and application of the double cone rotary vacuum dryer, or to upgrade it. Based on the vacuum drying theory, the necessary considerations for the upgrade of the domestic double cone rotary vacuum dryer are made, and some suggestive ideas are proposed for the reference of the people with lofty ideals. The purpose is to domestic double cone rotary vacuum dryer. Manufacturing and application levels are increasing.

1. Why is the double cone rotary vacuum dryer discussed as a classic equipment?

The double-cone rotary vacuum dryer is a widely used equipment in the production of raw materials in the past few years. This is because during the vacuum drying process, the pressure inside the cylinder is always lower than the atmospheric pressure, the number of gas molecules is small, the density is low, and the oxygen is contained. The low amount of the drug can dry the production of drugs that are susceptible to oxidative changes, and can reduce the chance of material contamination. Also, because the water is vaporized, the temperature is proportional to the steam pressure, so the moisture in the material can be vaporized at low temperature during vacuum drying to achieve low temperature drying. The double cone rotary vacuum dryer produced by Changzhou Fengneng Dry is especially suitable for The production of heat sensitive materials in medicines. At the same time, vacuum drying can eliminate the surface hardening phenomenon caused by atmospheric hot air drying. This is because the pressure difference between the vacuum drying material and the surface is large. Under the pressure gradient, the moisture quickly moves to the surface without surface hardening. In addition, when vacuum drying, the temperature gradient between the inside and the outside of the material is small, and the reverse osmosis allows the solvent to move and collect on its own, effectively overcoming the dispersion of the solvent generated by the hot air drying.

From a functional point of view, Changzhou Fengneng Dry Double Cone Rotary Vacuum Dryer is a drying equipment integrating mixing and vacuum drying. It is applied as a classic equipment with simplicity, convenience and double effect. It has practicality and economy. The sexual side is that other equipment is difficult to replace. However, in recent years, it has been diluted by people. The fundamental reason is that manufacturers lack the research and structural improvements. The main performance is that it is difficult to optimize CIP/SIP and drying performance. Therefore, it is necessary. Think about the upgrade.

2. The concept of vacuum drying speed

In the vacuum drying process, people always want to speed up the drying speed and shorten the drying time, but the factors affecting the drying speed are as follows:

(1) The condition of the material to be dried (such as material shape, size and size, stacking method), the moisture content, density, viscosity and other properties of the material itself. Generally, when the material particles are fine and uniform, the pile is loosened, and the thickness is thin, the internal moisture is easily diffused. If the initial temperature of the material is increased, the treatment before vacuum filtration, and the moisture content of the material are reduced, the vacuum drying speed can be increased.

(2) The higher the degree of vacuum, the better the vaporization of water at lower temperatures, but the high vacuum is not conducive to heat conduction, which will affect the heating effect on the material. In order to improve the drying speed of the material, the degree of vacuum should be considered comprehensively according to the characteristics of the material. Usually, the degree of vacuum is not less than 1 × 10 ⁴ Pa.

3. Discussion and suggestion on the factors affecting the vacuum drying speed of double cone rotary vacuum dryer

(1) The process of double cone rotary vacuum dryer was tested. The curves of vacuum, drying temperature, steam pressure and drying time were taken as parameters. The curve of the test showed that the drying process of the double cone rotary vacuum dryer can be divided into *heating, * Five stages of constant temperature, second heating, second constant temperature and cooling. among them:

* Warming is the preheating stage of heating the material to warm it up. In this stage, the amount of water vaporization in the material is small;

*The constant temperature is a constant-speed drying stage in which the free water, surface water, and capillary water of the material are vaporized in large quantities. Therefore, the temperature and the vacuum are in a constant state, and the degree of vacuum is approximately equal to the saturated vapor pressure of the water at the temperature of the drying apparatus;

The second heating is a process of heating the internal moisture of the material to the surface of the material, and the temperature of the material is increased due to the small amount of water vaporized, and the true degree is also increased;

The second constant temperature is a stage of vaporized water and a part of crystal water. Since the water mobility is determined by the vaporization rate, the temperature and the vacuum are in a stable state;

At the beginning of the cooling phase, the heating steam is turned off, and the cooling water is passed to the jacket jacket, and the cylinder is cooled to lower the temperature of the internal material to discharge the dried product.

Now the average drying process parameters of a product are listed in Table 1 below.

Table 1

4. Broaden the function of the double cone rotary vacuum dryer to adapt to a wider range of applications: As can be seen from the table, the properties of the drying process of the Changzhou Fengneng Dry Double Cone Rotary Vacuum Dryer are different, so it should be different. Different operating parameters are set according to their different stages, so that the functions of the device can be utilized more effectively. However, many operating parameters of a realistic double-cone rotary vacuum dryer are constant constant (such as rotational speed) or automatic control (such as working vacuum, drying temperature, etc.), and the following operating parameters for drying different stages of the process to vacuum drying speed The impact of the discussion and recommendations for improvement. In this regard, it is recommended to use a temperature sensing element so that the heat or cooling control in the jacket of the double cone rotary vacuum dryer can be changed during operation, and a menu can be set to select the temperature for different time periods, that is, Time-temperature relationship setting.

Increase mixing and granulation

A nozzle-equipped tube (which can spray the adhesive) can be inserted into the vacuum tube of the double-cone rotary vacuum dryer, and a vacuum mixing tube is added to the inside of the cylinder to add a fixed stirring blade. During the rotation of the cylinder, the agitating blades are fixed on the vacuuming tube to force the material to flow from both sides thereof, so that the radial movement is increased while the material slides along the cylinder wall. Therefore, the effect of mixing and stirring materials can be effectively improved, the moisture vaporization is accelerated, and the drying speed is improved. Thereafter, at the end of the powder material process, the powdery dry material can be formed into a granulated product by spraying a corresponding adhesive through a nozzle (a tube capable of spraying an adhesive).

5. Develop CIP/SIP structure to accommodate aseptic production

The CIP/SIP structure of the double cone rotary vacuum dryer should be changed to develop its structure. In addition to the ideas mentioned above, it can also be connected to the cylinder through a quick-open external spray cleaning device. Form a cleaning loop system. It is also conceivable that the cylinder of the entire Changzhou Fengneng Dry Double Cone Rotary Vacuum Dryer can be disassembled (such as the structure of the clamped square cone mixer), so that the entire cylinder can enter the cleaning station for cleaning and sterilization, of course, the difficulty of this assumption is too Big. This point is also the basis for the upgrade of the double-cone rotary vacuum dryer, so that it can adapt to the production of aseptic grade.

In this paper, the vacuum drying speed of the double-cone rotary vacuum dryer is theoretically discussed. At the same time, the imperfections of the structure of the domestic double-cone rotary vacuum dryer are analyzed, and the vacuum drying theory is proposed. The upgraded R&D has improved the R&D and application level of Changzhou Fengneng Dry Double Cone Rotary Vacuum Dryer, which has made this classic practical product a new vitality. However, the technical department of Changzhou Fengneng Company only put forward some ideas for thinking about its upgrade, and it is used to feed the people with lofty ideals to make the manufacture and application of the double cone rotary vacuum dryer increasingly beautiful.

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