SU1530891A1 - Bar grate cooler - Google Patents

Abstract

The invention can be used in the production of cement and other bulk materials. The purpose of the invention is to increase the cooling efficiency. The refrigerator includes a housing 1, an air-permeable conveying grate 5 located therein and a material distributor mounted for swinging across the grid on an axis associated with a reversing drive and made in the form of sockets 7 and 8 of variable section joined to a smaller base. The lower bell 8 is made with an angle of inclination of the side walls to the vertical axis, equal to 20-25 °. The axis of swing is placed on the upper bell 7. 3 Il. 1 tab.

Description

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The invention relates to apparatuses for cooling cement clinker and other volatile materials produced in rotary kilns.

The purpose of the invention is to increase the cooling efficiency.

Figure 1 shows the grate cooler, a longitudinal section; figure 2 - section aa in figure 1; on fng. Z - distributor geometry and its various positions during operation.

The grate cooler includes a housing 1 in which a focusing bunker 2 with a neck 3 of rectangular cross section, a distributor 4 and an air hopper (onits grate 5) is mounted. The lower part of the socket is made with the angle of inclination of the side walls to the vertical axis equal to 20-25 ° C, the upper bell 7 can be made, for example, as an incomplete cylinder. The swing axis 6 is fixed on the upper socket 7 and is reversible drive (not shown) and placed in the plane of symmetry of the hopper 2 so that the upper bell is above the cut of the neck 3 of the hopper 2. The radius of the bell forming 7 is obviously more than half the width of the neck 3.

Thus, the neck 3 is included in the socket 7 with a large gap. This makes it possible to always cover the flow of bulk material leaving the neck 3, even at very large deflection angles from the vertical axis (with a large width of the refrigerator). In grate coolers having a width of 2-3 times the height of the loading shaft, in order to distribute the material over the entire width of the grate 5, it is necessary to deflect the distributor 4 from the vertical by an angle of ot to 70.

The boundary values of the angles, ft and H are determined on the basis of the structural dimensions of the specific refrigerator and the angle of repose Cf of the material being cooled.

The maximum (limiting) angle about the deviation of the axis of the distributor 4 is determined from the ratio

sin rev. l - b 2 -). h - -5-

where h is the distance from the axis of swing

to the lower cut of the distributor; L is the width of the grate

a fridge;

b - Schioin of the lower section of the distributor (lower socket) j The value of the angle jb of the side walls of the distributor 4 is determined from the ratio

15

f - (90 ° - Cf),

0

five

0

where tf is the angle of repose of the material to be cooled (selected by reference).

The maximum value of about should exclude the contact of the distributor 4 and the walls of the housing 1 and ensures that the material is spread with an equal layer over the entire width L of the grate 5. If the value of less is less than the maximum, uniform spreading over the width L is not ensured.

For example, for the Volga-75 refrigerator (at L 6 m, h 2.8 m, oL 70 °). The values of the angles оС, ep, (f and И for various materials are given in the table.

Clinker material

Famous to the Pyrite

 (

.l.

70454525

70405020

70405020

70454525

The grate cooler works as follows.

From the rotating curing, the heated bulk material pushes into the hopper 2, and from there into the distributor 4 and further onto the conveying grate 5. Captured by the upper socket 7 all the bulk material falls into the lower socket 8, the angle of inclination of the side walls of which ensures reliable even pouring out of the distributor 4. Due to the fact that the distributor 4 performs uniform swinging across the lattice of the mezvud by the side walls of the refrigerator I, the bulk material falls into the bottom socket

153089

H, the angle of inclination of the side walls of which ensures reliable uniform development from the distributor 4.

10 15

Bulk material is laid on the transporting grate 5 along its width in the same height, which provides the same aerodynamic resistance to the cooling air, and consequently, uniform air distribution over the entire area of the transporting grate of the refrigerator and creates the best heat exchange conditions, while the secondary temperature air and the temperature of the bulk material at the outlet from the refrigerator is reduced.

sixteen

Claims (1)

Invention Formula The grate refrigerator for bulk material, comprising a housing with an air-tight conveying grate placed in it and a material distributor mounted with a possibility of pumping across the grate on an axis associated with a reversible drive, characterized in that , the distributor is designed in the form of variable-cross-section sockets connected to each other with a smaller base, the lower of which is made with the angle of inclination of the side walls to the vertical axis equal to m 20-25 °. Phie.1 Fig.Z