| 摘要 |
FIELD: machine building.SUBSTANCE: drying plant for solutions, suspensions and paste-type materials consists of a housing with a spraying chamber arranged in its upper part and equipped with an injector and a header for supply of heat carrier, a drying chamber with a vibro grain mill located in the central part of the chamber, and a heat carrier gas distribution system. Drying plant also includes solution supply and spent heat carrier cleaning system. Gas distribution system is equipped with two gas-distributing units: top and bottom. Top unit supplies heat carrier to spraying jet root and is designed for uniform distribution of heat carrier along the sprayed material jet. Bottom gas distributing unit allows for supplying heat carrier to the lower part of the housing, where a gas-distributing grate is installed. The grate is provided with nozzles to supply secondary heat carrier and a chute for granules discharge. Vibro grain mill is installed in central part of the housing in the form of a vibrating tray with a screen bottom with perforation coefficient equal to 0.3?0.5, and a perforated plate elastically fixed at the bottom by means of springs with perforation coefficient equal to 0.5?0.7, and a vibratory drive has a control unit, by means of which direction, amplitude and frequency of vibration is changed in the required optimum range of operating parameters of the granulating plant: vibration level is in the range of 100?120 dB, frequency of an oscillating process is in the range of 50?100 Hz; each injector consists of a cylindrical part with outer thread for connection to a nozzle of distributing pipeline and two in-series connected hollow cylindrical-conical belts coaxial to it, and coaxial to the housing, in its lower part there fixed is a nozzle formed with outer conical surface and an end blind partition wall perpendicular to the nozzle axis, in which there is a central throttle hole and at least three inclined holes at an angle of 45° to the nozzle axis; on the nozzle conical surface there is a cylindrical collar with outer thread for connection of the nozzle to lower cylindrical-conical belt of the housing; on the nozzle, on the side opposite to liquid supply, there is an additional row of jet nozzles which are formed at least with three pairs of mutually perpendicular vertical channels for liquid passage and horizontal channels which are intersected on a conical side surface of the nozzle and form outlet holes of each jet nozzle; paired channels are located at a right angle to each other in longitudinal planes of the housing; conical side surface of the nozzle has the apex angle equal to 90°, and two rows of throttle holes are made on the cylindrical-conical belt rigidly attached o the cylindrical part of the housing: one row represents at least three horizontal holes made on cylindrical surface; the other row represents at least three inclined holes at an angle of 45°, which are made on conical surface; in horizontal plane the projections of axes of holes in those rows are located at the distance from each other through an angle lying in optimum range of values of 7.5?60°. On the cylindrical-conical belt connected to the nozzle by means of inner thread there is a row consisting of at least three horizontal throttle holes; in horizontal plane the projections of axes of holes and jet nozzles, which are formed at least with three pairs of mutually perpendicular vertical and horizontal channels on conical side surface of the nozzle, are located from each other through an angle lying in optimum range of values: 7.5?60°.EFFECT: improvement of drying efficiency.3 dwg |
