Helix Vibrating dryer for Ammonium Paratungstate 

 Principle

 It is an innovation horizontal batch-type vacuum dryer . The moister of wet material will be evaporated by heat transmission. The stirrer with squeegee will remove material on hot surface and move in the container to form cycle flow. The evaporated moisture will be pumped by vacuum pump.

Wet materials are fed continuously to the top drying layer in the dryer. They will be turned and stirred continuously by harrows when the harrow's arm rotates, the material flows through the surface of the drying plate along the exponential helical line. On the small drying plate the material will be moved to its exterior edge and drop down to the exterior edge of the large drying plate underneath, and will then 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 saturated steam, hot water or thermal oil will be led into hollow drying plates from one end to other end of the dryer. The dried product will drop from the last layer of the drying plate to the bottom layer of the smell body, and will be moved by harrows to the discharge port. The moisture exhausts 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 product 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 recovery, bag dust filter, return and mix mechanism for dried materials and suction fan etc. solvent in those paste state and heat sensitive materials can be easily recovered, and thermal decomposition and reaction can be also carried out. 

 Application  

 Drying, heat decomposition, combustion, cooling, reaction, and sublimation

1. Organic chemicals

2. Mineral chemicals

3. Pharmaceutical and foodstuff

4. Feed and fertilizer

Feature 

(1) easy control, wide application

1. Regulate thickness of materials, rotating speed of main shaft, number of harrow's arm, style of and sizes harrows achieve best drying process.

2. Each layer of drying plate can be fed with hot or cold media individually to heat or cold materials and make temperature control accurate and easy.

3. Dwell time of materials can be accurately adjusted.

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

(2) Easy and simple operation

1. Start stop of dryer is quite simple

2. After material feeding is stopped, they can be easily discharged out of the dryer by harrows.

3. Careful cleaning and observation can be carried inside the equipment through large-scale viewing window.

(3) Low energy consumption

1. Thin layer of materials, low speed of main shaft, small power and energy required for conveying system of materials.

2. Dry by conducting heat so it has high heating efficiency and low energy consumption.

(4)Good operation environment, solvent can be recovered and powder discharge meet the requirements of exhaust.

1. Normal pressure type: as low speed of air flow inside the equipment and moisture being high in upper part and low in lower part, dust powder couldn't float to the equipment, so there is almost no dust powder in tail gas discharged from the moist discharge port on the top.

2. Closed type: equipped with solvent recovery device that can recover organic solvent easily from moist-carrier gas. The solvent recovery device has simple structure and high recovery rate, and nitrogen can be used as moist-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 type: if the plate dryer is operating under vacuum state, it is particularly suitable for drying heat sensitive materials.

(5) Easy installation and  small occupying area.

1. As the dryer is in a whole for delivery, it is quite easy to install and fix at site only by hoisting.

2. As drying plates being arranged by layers and installed vertically, it takes a small occupying area though drying area is large.

Parameter