PGL Continual Plate Dryer for pharmaceuticals/tray dryer

1.Descriptions

PLG Series Continual Plate Dryer is a kind of high effective conducting and continuous drying equipment. Its unique structure and operating principle determine that it has advantage of high heat efficiency, low energy consumption, small occupying area, simple configuration, easy operating and control as well as friendly operating environment etc. It can be widely used in drying process in the fields of chemical industry. Pharmaceuticals, agricultural chemicals, foodstuff, fodder, process of agricultural and sideline products etc, and is well received by various sectors in their practical usage. Now there are three big categories, named normal pressure, closed and vacuum styles, four sizes of 1200,1500,2200 and 3000, and three kinds of materials, namely A(carbon steel), B(stainless steel used for those all parts where materials are contacted) and C(on the basis of B to add stainless steel materials for vapor pipes, main shaft and support , and stainless steel linings for cylinder body and top cover). With drying area being from 4 to 180 square meters, now we have hundreds of models of series products and various kinds of auxiliary devices available to meet requirements of drying materials for customers.

2 The principle of work

Wet materials are fed continuously to the first drying layer on the top of the dryer. They will be turned and stirred by rakes when the rake arm rotates and drop down to the outer edge of the large drying plate under earth, and will be moved inward and drop down from its central hole to the small drying plate on the next layer. Both small and large drying plates are arranged alternately so as materials can go through the whole dryer continuously. The heating media, which could be informs of saturated steam, hot water or heat conducting oil will be led into hollow drying plates from one end to the other end of the dryer. The dried materials will drop from the last layer of the drying plate to the bottom layer of the shell body, and will be moved by rakes to the discharge port. The moisture escapes from materials and will be removed from the moist discharge port on the top cover, or sucked out by the vacuum pump on the top cover for vacuum-type plate dryer. The dried materials discharged from the bottom layer can be packed directly. The drying capability can be raised up if equipped with supplementary devices such as finned heater, condenser for solvent retrieval, bag dust remover, return and mix mechanism for dried materials and drawing fan etc. Solvent in those dried paste and heat sensitive materials can be easily retrieved and thermal decomposition and reaction can be also carried out.

3 Features

(I) Easy regulation and control, strong adaptability

1. Regulate thickness of materials, speed of main shaft, number of rake arm, style of and sizes of rakes to make drying process be optimal.

2. Each layer of drying plate can be led thermal or cold media individually to heat of cold materials and make temperature control accurately and easily.

3. Dwelling time of materials and be accurately adjusted.

4. Single flowing direction of materials without return flowing and mixing, even drying and stable quality, no re-mixing is needed.

(II) Easy and simple operation

1. Start and stop of dryer is quite simple.
2. After materials are stopped feeding and conveying, they can be easily exhausted out of the dryer by rakes.
3. Careful cleaning and observation can be carried inside the equipment through large-scale viewing window.

(III) Low energy consumption

1. Thinner layer of materials, low speed of main shaft, small power and energy needed for conveying system of materials.
2. Dry by conducting heat so it has high heating efficiency and low energy consumption.

(IV) Friendly environment, solvent can be retrieved and dust powder discharge can meet requirement.

1. Normal pressure style: as low speed of air flow inside the equipment and moisture being high in upper part low in lower part, dust powder could not float to the top of the equipment, so there is almost no dust powder in tail gas discharged from the most discharge port on the top.
2. Closed Style: equipped with solvent retrieval device that can retrieve organic solvent easily from most-carrier gas in closed circulation for those subject to burning, explosion and oxidation, and poisonous materials in order for safe operation. Especially suitable for drying of flammable, explosive and poisonous materials.
3. Vacuum Style: if the plate dryer is operating under vacuum state, it is particularly suitable for drying of heat sensitive materials.

(V) Easy installation and small occupying area

1. As the dryer is in a whole to leave the factory and to be transported, it is quite easy to install and fix in the location only by hosting.

2. As drying plates are arranged by layers and installed vertically, it takes a small occuping area through drying area is larger.