Food grade sweet potato starch dryer cassava starch drying machine

Tower type starch drying machine is a commonly seen dryer. The height of tower type starch dryer is 15 – 18 meters. The work principle is to evaporate the mixing material which made by raw material and dry with hot air stream. But it consumes a lot of heat energy source. And the stability of working is not good wich affects the quality of the starch powder as well.

QZWG Type Air stream crash starch drying machine is invented by our factory. This plant is designed with positive-negative pressure. This scientific achievement is appraised by Henan Technology Gallery in September, 2006. The invention patent number is ZL2006 10086403.8.

The work principle of starch drying machine is to unite two kinds of flash evaporation and drying theories:

(1) when the wet material and hot air mix up in the drying tube, they could go ahead at high speed in parallel with two suspended states, and crash, damped vibration. Then they go to air blower for refinement. The drying area of material is increased. And the heat efficiency is improved;

 (2) Material is delivered from air blower to vortex room. After fineness, the heavy material containing more moisture revolves along the outer wall at high speed, in order to increase the relative velocity, strengthen the effect of heat transfer, and improve the heat transfer confident of the volume. The material containing regular moisture discharges from the center to the top. The feature of this plant is good quantity of drying, high effect of heat transfer, and low energy source consumption. The height of this plant is lower 50% than tower type starch dryer.

Compare with tower type starch dryer, air stream crash starch drying machine has two advantages:

1. Save heat energy source. The work pressure of heat exchanger is 0.4 - 0.5 MP (0.6 - 0.8 MP for tower type starch dryer), drying temperature solid mixing is ≤55°C (≥65°C for tower type starch dryer). It saves heat energy source 5 – 8% as reducing work pressure and drying temperature. If produce starch 100T/d, it saves stream 4 – 6 T/d
2. Starch quality is very good. the initializing temperature for sweet potato gelatinization is 58°C, the final temperature for sweet potato gelatinization is 72°C. Although tower type starch dryer is a flash stream drying, the drying temperature reaches to gelatinization temperature. So there is some starch gelatinization. And there is a little of yellow suspended solids after mixing water. But, for air stream crash dryer, the temperature is lower gelatinization temperature, so it guarantees quality of the starch.

Main technical parameters of starch drying machine:

Gelatinization temperature of other starches:

Corn starch: 62 - 72°C;       Cassava starch: 59 - 69°C;

Potato starch: 58 - 68°C;           Wheat starch: 58 - 64°C

Our starch drying machine:

Good performence in oversea market: