JPS6130157Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a cooling device for powder and granular materials, such as a cooling device for cement clinker. The present invention relates to a cooling device that supplies cooling air for cooling a powder layer on a grid bed.

The prior art will be explained with reference to FIG. A front lattice floor 53 in which movable lattices 51 and fixed lattices 52 are arranged alternately, and a rear lattice floor 54 configured in the same manner as described above are connected in a stepwise manner. Therefore, the powder layer 5 that has accumulated on the lattice bed 53 in the previous stage and is moving in the transport direction 55
The thickness d of 6 becomes smaller on the fixed grid 52a at the final end. Therefore, the flow pressure loss of the cooling air due to the powder layer 56 on the fixed grid 52a becomes small, and blow-by of the cooling air occurs. When this blow-through phenomenon occurs, the entire lattice floor 53 cannot be used effectively, and the fine particles that tend to collect on both sides in the width direction cannot be cooled.
Thermal efficiency decreases. Moreover, the fine grains are on the lattice floor 5 in the previous stage.
3 to the rear lattice floor 54, so that the fine particles still in a red-hot state fall onto the lattice floor 5 at the rear end.
4 and burn out the grid.

The present invention solves the above-mentioned technical problems, improves cooling efficiency by preventing the blow-through phenomenon of cooling air from occurring at the difference in level between the front and rear grid floors, and prevents the grid floor from burning out. It is an object of the present invention to provide a cooling device for powder and granular materials that prevents the

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a simplified longitudinal sectional view of one embodiment of the present invention. The casing 2 of the cooling device 1 is configured to have a rectangular shape extending in the lateral direction, and a connecting introduction part 3 extending upward is provided at one end along the lateral direction. A discharge port of a rotary kiln 4 is rotatably connected to this connection introduction part 3. rotary kiln 4
Cement clinker burned in the cooling device 1 by the combustion heat of the burner 5 is introduced into the cooling device 1 from the discharge port. Inside the casing 2, a plurality of lattice floors 6, 7, 8, 9, for example, first to fourth tiers, are arranged in a stepwise manner from one end to the other end in the lateral direction. There is. The charged cement clinker is transferred as shown by arrow 10 over the first to fourth tiers of grid beds 6 to 9. Further, below the lattice floors 6 to 9 of each stage, ventilation chambers 14, 1 are separated by partition walls 11, 12, 13 and correspond to each other individually.
5, 16, and 17 are formed, and the cooling air supplied to each of the ventilation chambers 14 to 17 by the blower 18 flows upward through the corresponding lattice floors 6 to 9, respectively, and flows into the clinker layer 19. be distributed. As a result, the clinker layer 19 is cooled while being transferred in the transfer direction 10, and the cooled clinker is discharged from the discharge port 20. Note that a part of the air heated by exchanging heat with the clinker is recovered as combustion air for the burner 5, and the remaining air is led out from the exhaust port 21.

FIG. 3 is a longitudinal cross-sectional view showing a part of the first stage lattice floor 6 and the second stage lattice floor 7. The first stage grid floor 6 includes a large number of movable grids 22 provided in multiple rows in the width direction (direction perpendicular to the paper surface of FIG. 3), and a large number of fixed grids 23 provided in multiple rows in the width direction. , are arranged alternately along the transport direction 10. The movable gratings 22 are respectively connected to carts 24 extending laterally within the ventilation chamber 14, and the carts 24 are reciprocated by driving means (not shown). In response to the reciprocating movement of the cart 24, the movable grid 22 moves back and forth as shown by the arrow 25, thereby moving the clinker on the fixed grid 23 along the transport direction 10.
is pushed forward along the The clinker layer 19 is thus transferred as a whole in the transport direction 10.

Similar to the first stage grid floor 6, the second stage grid floor 7 has a movable grid 26 and a fixed grid 27 in the transfer direction 1.
They are arranged alternately along 0. The first tier lattice floor 6 and the second tier lattice floor 7 are connected to each other with a step, and a stepped lattice 2 is provided in the step part.
9 is integrally provided.

4 is a simplified plan view of FIG. 3, and FIG. 5 is a sectional view taken along the cutting plane line - of FIG. 4. According to the present invention, the fixed grid 28 at the final end of the first stage grid floor 6 has both sides 31 in the width direction,
The central portion 30 except 32 is a blind grid. Furthermore, the fixed grids 28 on both sides 31 and 32 are connected to the flow holes 3.
It is assumed to be a perforated lattice having 3 holes. Furthermore, each fixed grid 28 of the central portion 30 is integrally formed with an upwardly protruding protuberance 34 .

FIG. 6 is a longitudinal sectional view showing a part of the second-stage lattice floor 7 and the third-stage lattice floor 8. The third tier lattice floor 8 is constructed by movable lattices 37 and fixed lattices 38 arranged alternately in the same way as the lattice floors 6 and 7 of each tier described above. Second tier lattice floor 7 and third tier lattice floor 8
A stepped lattice 39 is provided at the step portion between the lattice floor 7 and the lattice floor 7, and the stepped lattice 39 is integrally fixed to a fixed lattice 40 at the final end of the second tier lattice floor 7.
This fixed grid 40 is a blind grid over the entire width of the grid floor 7.

The stepped portions of the third tier lattice floor 8 and the fourth tier lattice floor 9 are constructed in the same manner as in FIG. 6 described above.

FIG. 7 is a longitudinal sectional view showing the vicinity of the final end of the fourth stage lattice floor 9. The fourth stage lattice floor 9 is composed of movable lattices 41 and fixed lattices 42 arranged alternately in the same way as the aforementioned lattice floors 6, 7, and 8, but the fixed lattice 43 at the final end has a full width. It is said to be a blind grid for many years. A crevice 44 is provided following the fourth stage lattice bed 9, and the clinker that has passed through the crevice 44 is discharged from the discharge port 20 via a chute 45.

In the cooling device 1 configured as described above,
The clinker introduced from the rotary kiln 4 is cooled from a high temperature of, for example, about 1350°C to about 600 to 700°C in the first stage grid bed 6, and then moves to the second stage grid bed 7. During this movement, a raised portion 34 is formed on the fixed grid 28 of the central portion 30. Therefore, in the central portion 30, the third
As shown in the figure, the transport of the clinker layer 19 is hindered, and the layer thickness d1 of the clinker layer 19 becomes large. Moreover, since the fixed grid 28 is a blind grid in the central portion 30, air is prevented from blowing through. In order to prevent blow-through, if only the above-mentioned portion is made blind, the blind grating will not be cooled and will burn out, or the blind grating will be protected by clinker deposited by the raised portions 34. Also, both side parts 31 and 32
Although the fixed grid 28 is a perforated grid, fine clinker tends to accumulate on both sides 31 and 32, and even if the thickness d2 of the clinker layer 19 (see Fig. 5) becomes small, Since the flow resistance is large, no blow-through occurs.

After being cooled in the first stage lattice bed 6, the clinker passes through the second, third, and fourth stage lattice beds 7, 8, and 9 in order to be cooled. Therefore, after the second-stage grid bed 7, the clinker is not red-hot, and therefore the fixed grid at the final end of each of the second, third, and fourth-stage grid beds 7, 8, and 9 has a full width. By creating a blind grid across the grid, it is sufficient to prevent cooling air from blowing through, and the grid will not be burnt out due to red-hot fine clinker.

Note that if the clinker is in a red-hot state at the final end of the second-stage lattice bed 7, the second-stage lattice bed 7
The fixed grid at the final end of the grid is also constructed in the same manner as the grid floor 6 of the first stage.

The present invention can be widely implemented not only as a cooling device for cement clinker as described in the above-mentioned embodiments, but also as a cooling device for powder and granular materials.

As described above, according to the present invention, the fixed grid at the center in the width direction of the grid bed where the powder is in a red-hot state is a blind grid having a raised part, and the fixed grid at the end of the remaining grid bed is fixed in the width direction. Since the grid is a blind grid throughout the grid, air blow-through phenomenon is prevented from occurring at the stepped portions of each grid bed, the powder and granules are efficiently cooled, and the grid beds are prevented from burning out.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the prior art, FIG. 2 is a simplified vertical sectional view of an embodiment of the present invention, and FIG. FIG. 4 is a simplified plan view of FIG. 3, FIG. 5 is a sectional view taken along the cutting plane line - of FIG. 4, and FIG. FIG. 7 is a vertical cross-sectional view showing a part of the third-stage grid floor 8, and FIG. 7 is a vertical cross-sectional view showing the vicinity of the final end of the fourth-stage grid floor 9. 1...Cooling device, 6,7,8,9...Grate floor,
10... Transfer direction, 14, 15, 16, 17...
Blow chamber, 19... clinker layer, 22, 26, 3
7, 41...Movable grid, 23, 27, 28, 3
8, 40, 42, 43...Fixed grid, 30...Central portion, 34...Protuberance.

Claims (1)

[Scope of utility model registration request] A plurality of stages comprising a plurality of movable gratings reciprocating in the transfer direction and arranged in plural rows in the width direction and a plurality of fixed gratings in plural rows in the width direction, which are alternately arranged along the transfer direction. The lattice floors are arranged in a stepwise manner so as to be sequentially downward in the transfer direction, and each lattice floor is supplied from a ventilation chamber provided individually corresponding to the lower part of each tier of the lattice floor. In a cooling device for powder and granular material in which cooling air is supplied to a layer of powder and granule on a lattice bed by flowing through the granular material, at the end of the granular material in the transport direction on the lattice bed of the stage where the granular material is in a red-hot state, the air is cooled in the width direction. The fixed lattice in the central part, excluding the vicinity of both sides, shall be a blind lattice having upwardly raised ridges, and the fixed lattice at the end of the remaining tiers of the lattice floor shall be a blind lattice over the entire width direction. A cooling device for powder and granular materials.