A complete spray drying equipment system should include an air supply system, exhaust system, drying system, separation system, and cleaning system.
The main factors affecting the yield of extract powder are the exhaust air temperature and the pressure difference of the cyclone separator. If the exhaust air temperature is too high, the fineness of the extract powder is smaller, the moisture is lower, and the smaller the particles are, the easier it is to be discharged. If the pressure difference is too high or too low, the extract powder will also be discharged.
The ground slurry is further stirred uniformly in the stirring tank and heated to above 35 degrees Celsius, and then pressure is applied to the stirring tank. The slurry is sent to the atomizer under the action of the pressure and then atomized by the atomizer sprayed into him from the lower part of the tower.
After being heated by the oil-gas heat exchanger, spray drying equipment is sent to the gas distributor on the top of the tower by the blower. After the gas distributor, spray drying equipment enters the tower evenly and in a cyclone shape to dry and granulate the atomized slurry. After the pellets are in contact with the hot gas, the liquid on the surface will quickly evaporate, and the gas inside will migrate to the surface and be taken away by the hot gas during the subsequent drying process. The dried pellets fall to the bottom of the tower and are recycled through a pair of butterfly valves.
The collected gas after drying the slurry contains vaporized ethane and a small amount of tiny dust. The gas will be sent to the cyclone separator by the pressure fan first, and the dust in spray drying equipment will be preliminarily separated, and then sent to the leaching tower for condensation.
In the leaching tower, the gas will be fully scrubbed, and the condensed ethane gas is collected at the bottom of the leaching tower, and the scrubbed gas is sent to the oil-gas heat exchanger for heating and reuse. During operation, the system maintains a slightly positive pressure state, which is automatically controlled by the air supply valve and exhaust valve.
This action avoids the shortcomings of hot air vortex and axial flow and also installs a hot air rectification chamber. The air outlet of the rectification chamber is equipped with honeycomb-shaped fixed blades, similar to the guide impeller of a paddle turbine. The hot air flows out through the radius of the fixed blades.
Changed the direction of the hot air, blowing towards the drying tower. In this way, the vortex hot air is converted into the axial supply of the drying tower by the fixed blades, so as to achieve the purpose of rectification, and the effect is very obvious for the product adhesion problem in the drying tower.
Moreover, after rectification, the hot air is prevented from rotating, so that the heat can be evenly received when the mist drops, so that the thermal change of the finished product can be kept to a minimum, thus improving the quality of the finished product.