Multi-stage separation heat-exchange type drying system

A dry system of a multi-staged separation heat exchange type, the dry system comprising:

• a dryer,
• a heat exchange apparatus recovering heat from first air of a high temperature and high humidity discharged by the dryer, heating-exchanging the first air with outside dry second air of a low temperature and discharging the heat-exchanged air,
• a heater heating the second air discharged by the heat exchange apparatus,
• a discharge fan supplying the first air discharged by the dryer to the heat exchange apparatus and externally discharging the first air, and
• a ventilation fan supplying the second air discharged by the heat exchange apparatus to the dryer through the heater,
• wherein the heat exchange apparatus comprises:
• a first main body in which the first air discharged by the dryer flows therein on one side and exits therefrom on the other side, a plurality of first heat exchange blocks having first heat medium circulation tubes disposed therein is disposed at specific intervals so that a heat medium heat-exchanged with the first air circulates within the first heat exchange blocks in a width direction from front to back, and a first whirl generation block changing a flow of the first air passing through the first heat exchange block into a whirl is disposed between the first heat exchange blocks;
• a second main body which is disposed over or under the first main body adjacent to the first main body and in which the second air flows therein on the other side and exits therefrom on one side, and a plurality of second heat exchange blocks having second heat medium circulation tubes disposed therein is disposed at specific intervals within the second main body so that a heat medium heat-exchanged with the second air circulates within the second heat exchange blocks in the width direction from front to back, wherein the second heat exchange block is disposed over or under a corresponding first heat exchange block, the heat exchange blocks corresponding to each other up and down exchange heat media, and a second whirl generation block changing a flow of the second air passing through the second heat exchange block to a whirl is disposed between the second heat exchange blocks;
• a plurality of heat medium connection pipes each of which is connected to the first heat medium circulation tube and the second heat medium circulation tube and along each of which the heat medium heat-exchanged with the first air passing through the first heat exchange block is introduced into a corresponding second heat exchange block and a plurality of heat medium circulation pipes along each of which the heat medium introduced from the first heat exchange block to the second heat exchange block and heat-exchanged with the second air passing through the second heat exchange block is introduced into a corresponding first heat exchange block again;
• a plurality of heat medium circulation pumps, each of the plurality of heat medium circulation pumps being disposed along the path of the heat medium circulation pipe and circulating the heat media of the first and the second heat exchange blocks corresponding to each other;
• a plurality of cleaning solution spray units, each of the plurality of cleaning solution spary units being disposed in the first and the second heat exchange blocks and removing dust attached to the first and the second heat medium circulation tubes within the first and the second heat exchange blocks, respectively;
• and
• a main controller controlling the ventilation fan and the discharge fan so that flow rates of the first air and the second air flowing into a discharge line and a supply line are adjusted, controlling the heat medium circulation pumps so that a circulation flow rate and velocity of the heat media flowing into the first and the second heat exchange blocks are adjusted, and controlling the cleaning solution spray units so that a cleaning solution is adjusted and sprayed based on a set time and amount.