DE928698C - Device for the rapid cooling of heated material, especially Portland cement clinker - Google Patents

Description

Device for the rapid cooling of heated material, in particular from Portland cement clinker. The invention relates to a device for rapid cooling of heated material, especially Portland cement clinician, that is in a rotary kiln has been burned, and consists of its step grate with overlapping, alternately stationary or reciprocating grate plates, the vertical ones Have passage openings and threshold-like projections on their leading edge.

The main cooling elements used in known invention Stair grating types a number of overlapping, horizontal, water-cooled Grate plates, with stationary grate plates Dfie moving with you and her moving Grate plates are used to keep the material density constantly in motion, so that the individual material particles are rolled back and forth and cooled down in the process, while they move forward after the A'b - ,, v @ throwing point at the bottom of the grate system. The angle of inclination formed by the leading edges of the successive grate plates is preferably relatively flat and in any case smaller than the angle of repose - of the material; preferably an angle of inclination of approximately 1z ° is provided, which is small enough to prevent new ones additional Grate particles freely down the stair grate.

Each grate plate has a large number of vertical air circulation openings The grate plates alternate with the reciprocating movement covered .and are open, with D. return air through these openings upwards into the Clinker layer is pressed. The fixed and movable grate plates grip at a small distance of, for example, about 6 mm above one another, so: d @ ate a horizontal one Air gap arises: through which the air is continuous and essentially perpendicular to the air jets passing through the holes approximately in the direction of this material run is pressed.

The material particles are un: medium-fair after falling through the slide, exposed to cold air rays from the oven into the cooling room, and by keeping them in constant motion and turning them over while they are being driven by Moving on from grate to grate, the cold air jets cause it from two directions on which, material particle wedge hitting, a sudden and even cooling.

The Raurar in the cooling chamber below the step grate forms one Wind box to which a fan is connected, which supplies a quantity of air, which is at least equal to the furnace's need for secondary air for combustion.

When using such stair gratings it was found that the material sometimes suddenly flows down the steps of the cooling device or falls in cascades and at the other end .timen red-warm heaps. forms. This process interrupts the steady operation of the device causing it an irregular preheating: of the secondary air led into: the oven and leads to: a generally unsatisfactory state that affects the performance and regularly: i: ge Operation of the device interferes. Occasionally the large pieces of material slide over the smaller ones, but even more often the whole mass slides, similarly an avalanche. The sliding process seems to be tight with the high temperature : of the material to be linked, for it has been shown to occur in the lower section the Klink: Erlcühlvarrichtung not open. Anyway, the process continues up to that the end of rust - once it has been triggered in the region of high temperature is.

As the best means to avoid the cascade or avalanche formation of the hot To prevent material, according to the invention, the donning of an upward -oriented, bead-like part on the front edge, the individual steps of the stair grating found. This swell-like projection proves to be most effective in the case of about the same width as the grate plate and with a slope at the front. 2o to 3o ° against the plane of the plate. Although the Kaslca; denbi, l: dun-: mainly in.. The upper or hot half of the Kl.inkerstromes occurs, it can be advantageous to sälche Use bead-like projections on all grate plates. To explain the subject matter of the invention w: Ird on the drawing: referred to, dlie as an exemplary embodiment and not in restrictive .F: o: rm zu. understand eats.

Fi: g. r. is a TeMwense representation of the cooling device in longitudinal section; Edg.2 is a top plan view of one of the grate plates; FIG. 3 is a vertical section taken along line 3-3 of FIG. 2.

During the operation, the clinker falls from the Dreihrohrüfen i through a slide ii onto the plate 12 and forms a relatively gently sloping layer on the surface serving stationary b: zw. movable grate plates 16 and 17. The layer is pushed forward by the reciprocating movement of the movable grate plates 17 and towards the discharge end on the wall 61: in. Moved regularly, although in a settling manner. The height of the layer is normally 75 to 150 mm, and the extent of the advance is also: by the distance over which the grate plates 17 move, as by the speed of the Movement regulated. By the moving grate plates being pushed forward and withdrawn, the passage openings in the rear part of each grate plate, except for the topmost, are alternately covered or not covered with material : rtsf @ eist grate plates 16, the pawl particles from the movable grate plates 17 lying between them onto the stationary grate plates i6 immediately below, from which they are pushed off again during the next forward movement. Every sudden downward flow or a so-called cascade fall from! Plate I2 up to the wall 6 1 w, ir: d: through the threshold-like protrusions 54 on the grate plates full prevented from coming.

The largest, practically achievable advance of the movable grate plates corresponds approximately to their half width, in which position the rear edge of each movable Ro: s @ tp, latte is still covered by the front edge: of the fixed grate plate above, which prevents fine-grained clinker between the Rostplütten can get. In addition, the extent of the sliding advance and consequently the layer height can be changed by regulating the drive motor. The stationary and movable grate plates are essentially of the same type and can also be manufactured from steel rods 53 reinforced gray cast iron, the front or leading edges of the stationary grate plates 16 and the front and side edges of the more movable grate plates 17 preferably z. B. by quenching, should be hardened in order to withstand the wear and tear of the I-ainker. The front part of the grate plates 16 and 17 has an upwardly rising sill-like reinforcement because it occupies about 401 / o of the entire width of the grate plate and the surface of which forms an angle of about 20 to 30 ° with the plane of the grate. This part has a thickness at its front edge which is preferably slightly more than 500/0 greater than the material thickness of the grate at its rear edge; The greater material thickness of the grate plates at their front edge, which is the result of the clamp-like reinforcement, causes the material to fall over a greater distance when passing from one grate plate to the next. This results in an increasing cooling effect In the device shown in Fig. 1 only the grate plates near the inlet end are provided with such projections: it is obvious that such reinforced grate plates can be used over the entire cooling device.

One! each grate plate is with a variety of passages or Openings 6o provided which, essentially perpendicular to their bearing, the Kl, inke.r Surface lying and looking down weird like that. expand that they. by small cannot be clogged. Between the -, vech, s @ ehvei, s, e consecutive ones There is a space of approximately 6 mm between the grate plates and horizontal ducts for those coming from the lower part of the cooling chamber 7 that forms the wind box To form air.

A major advantage of the grate plates designed according to the invention with threshold-like projections 54 lies in the fact that a second cooling process is made dispensable because by increasing the silt height: the material of one grate plate to the next the ventilation of the material and its cooling is increased so that the material on the last roist plate is comfortable with gloves can be included. So the use of the m-i-t prevents the bulbous Rust plates provided with protrusions not only lia, vimen-like lintels of the material by cooling down, but also increases the degree of effectiveness of the A, b @ lcii @ .hlvo, rgang.

Claims (3)

PATENT CLAIM: i. Device for rapid cooling of heated Material, especially from Portlandzem @ entkl: inker, m.ittel.s compressed air, consisting from a step grate with overlapping grate plates, which alternate stationary b, betw. are movable back and forth in the longitudinal direction of the grate, thereby that the, Ro, stp, laths (16, -17) .still-like projections (54) are present, which on the front, about q.00 / 0 - the grate: slat-width part in one Angle of about 25 ° b is increasing to the front edge of the grate plates, see above. that the Rust plates on their front edge a little more than 5o% stronger than on their rear edge will. 2. Apparatus according to claim i, characterized in that the grate plates in the upper part of the step grate projections (54) have their front edges and that the grate plates in the lower part of the step grate have a flat surface. 3. Apparatus according to claim i and 2, characterized in that .the grate plates with equal, e, i @ chäß, ig distributed, upwardly narrowed holes (6o) for the passage The compressed air is provided perpendicular to the surface of the grate plates get lost. Device according to Claims i to 3, characterized in that the front edges the cast iron grate plates (16) as well as the front and side edges the movable grate plates (17) are hardened by quenching. Druclzsdh, dressed: U.S. Patent No. 2,137,155; Swiss Patent No. 193 565; German Paterntschrift No. 66o q.86.