SU553421A2 - Multizone dryer for fibrous materials - Google Patents

Description

one

The invention relates to a textile raw material drying technique and is intended for use in the primary fiber processing industry and in the textile industry for drying thin stem materials and textile fibers, such as flax, hemp trusses, jute and kenaf fibers, cotton, wool, etc. after their heat or wet processing.

According to the main author. St. No. 421869 is a well-known multi-zone dryer for fibrous materials, containing: a chamber with a conveyor for moving the material being dried from a loading device to a discharge device and axial fans for reversing blowing of the layer of material by a coolant supplied through pressure boxes with hollow walls-nozzles placed above and below the conveyor, connected to a centrifugal fan for two-sided blow-drying of the material being dried at the boundaries of the zones, and the shafts of axial fans are located in the plane of the working branch the conveyor and each axial fan are connected to three adjacent ducts placed above and below the working branch of the conveyor 1.

The disadvantages of the known installation are the unevenness of the saping of the flax seed along the length of the stems and the low intensity of the process.

The aim of the invention is to intensify heat and mass transfer and increase the uniformity of drying.

This goal is achieved by introducing into the design of pressure boxes from below and above the conveyor of movable air guiding screens with a heat radiating surface and installing a casing with inclined side walls above the working branch of the conveyor, the notolechny part of which is made in the form of a profiled grille.

FIG. 1 shows the installation, a general view in longitudinal section; in fig. 2 - section A-A, FIG. one; in fig. 3 is a section BB, FIG. 2; in fig. 4 - profile arcuate section of the ceiling part of the casing.

The dryer contains a chamber 1 with a conveyor 2, loading and unloading devices (not shown), axial fans 3, pressure boxes 4 with hollow slotted walls 5 and air guide screens 6 connected to the centrifugal fan 7, steam heaters 8, casing

9 with profiled grilles 10, consisting of drying zones M, cooling 12, and vacuuming 13, a droplet separator 14, and a nozzle blowing ventilation system 15. The shafts 16 axial fans 3 are located in

the plane of the working branch of the conveyor 2, and

Each fan is connected to three adjacent KopodaiM 4.

The installation works as follows.

The stalks or fibers are superimposed on the net of the conveyor 2 and move in the casing 9 at a given speed. The heated air is supplied to the material from bottom to top and from top to bottom by axial circulation fans 3 and centrifugal fans 7. In bottom-up blowing zones, the material layer is suspended and expanded, and is additionally loosened at the boundaries of the zones by two counter-parallel struts mi air coming out of the sun 5 at high speed. At the same time, due to the presence of air guiding shields 6, when entering the layer, more air is supplied to the butt, thicker part of the layer and less to the top part.

This ensures uniform drying of the layers of flax along the shirip of the conveyor, i.e., the length of the stems. The profiled grids 10 do not prevent the layer of material from expanding in a suspended state, but delay the removal of debris from the layer of material beyond the limits of the conveyor 2. In this case, the grids 10 are self-cleaning in contact with the moving material. The layer of material makes a wave-like movement and, thanks to the inclined walls of the casing 9, the stalks of flax seed in the layer are aligned on the bombs, which is very important for the subsequent machining of the layer of stalks on the flax milling machine.

The air passing through the layer of material is again directed through the heater -8 to the inlet of the fan 3. Pre-heated fresh air is supplied by one fan 7. At the end of the drying zone 11, air is also supplied through the cooling zone 12. In this way, a counter-current variant of the movement of the drying agent and the material being dried is carried out, with recirculation and intermediate heating of air, through the zones of the dryer. The exhaust air is vented to the atmosphere. In the zone of chilled day 12, the layer of material is somewhat cooled by outside air. In the wet zones, the material layer is blown saturated.

moisture with air (f: 85-90%,) and is slightly moistened from the surface, which is very useful in the machining of flax on a flax-breaking machine. Circus qi moist warm

air in the zones of moistening 13 is closed.

Claims (3)

1. Multizone dryer for fibrous materials according to author's certificate no. 421869, characterized in that, in order to intensify heat and mass transfer and increase drying uniformity, pressure boxes are equipped with movable air-guiding screens with a heat radiating surface, and a working cover with inclined side steppes is installed above the working conveyor branch as a profiled lattice. 2. The dryer according to claim 1, is different in that the casing grid is made in the form of alternating arcuate and flat portions. 3. The dryer according to claim 2, wherein that the arcuate lattice regions consist of two conjugate parts, described by different radii. Sources of information taken into account in the examination: 1. Auth. St. No. 421869, cl. F 26B 17/04, 1970. b- b f YU K molisoo) Fig l