JPS5932788A - Cooling device of particulate material - Google Patents

Abstract

PURPOSE:To efficiently cool clinker by a structure wherein a stepped part is formed in a grating bed in its low temperature zone and splinkling of water is applied at the stepped part. CONSTITUTION:Cooling water is sprayed through spray nozzles 39 against the clinker falling down from an upper step grating bed part 20 to a low step grating bed part 21, while cooling air is blasted through vent holes 41. The cooling water is mixed with the cooling air and, after that, blasted against the clinker in the form of mist in order to cool the clinker. Because the cooling water turns into mist and no local spraying of the cooling water occurs, no water drips from the clinker. Because the cooling water is sprayed against the falling clinker at the stepped part 19, the cooling water is also sprayed over the clinker, which was located at the uppermost part of the clinker layer in the upper step grating bed part 20 and has high temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling device for powder and granular material, for example, a cooling device for cement clinker. A cooling device for powder and granular materials is developed.

In a cooling device in which cooling air is circulated from below through the powder layer of a grid bed, the temperature of the cooling air increases as it goes upward, and the temperature increases as it moves upward in the powder layer. Since it has a temperature distribution that results in high humidity, it is not possible to maintain a large temperature difference between the granular material to be cooled and the cooling air, and therefore the cooling effect is poor. Therefore, conventionally, the area of the grid floor is set large, or cold Jl water is poured into the powder layer where the humidity is relatively low. In this way, if the area of the grid floor is 15 degrees, the cooling device will be 15 degrees, and when cooling water is sprinkled from above the powder layer, the amount of cold discharged will be 15 degrees.
41, which unnecessarily lowers the l:ia degree of the air, which is particularly inconvenient when the sensible heat of the discharged air is recycled. In addition, when cooling water is sprinkled from below the powder layer, the water is sprayed below the powder layer where the temperature is relatively low, so it is difficult to wait for the improvement of the cooling effect. In addition, there is a risk that the sprayed cooling water may drip from the grate floor.

The object of the present invention is to solve the above-mentioned technical problems and provide a cooling device for powder and granular material with improved cooling effect.

Hereinafter, the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a simplified longitudinal cross-sectional view of one embodiment of the invention. The casing 2 of the cold j3J device 1 is configured in a rectangular shape extending in the lateral direction, and has an i! A connection introduction section 3 or 4J is installed. This connection introduction part 3 has a rotary key / l / n 4 no. 1: Ili lli r
-] Forcefully and rotatably connected. The cement fired by the combustion heat of the C gas 5 in the I coke kiln 4 is discharged into the casing 2, where there is a low discharge [-1 to the G in the cooling device 1]. Has movable grating and fixed,
There is a total of 1 lattice floor 6 made up of alternately arranged r1'
lli11 (provided over two sides, and below the lattice floor 6 is a ventilation chamber 7). Since the seven-ment tarinka is not transferred in the transport direction 8 from the grid bed (not shown by the arrow), it is cooled by the cooling air flowing upward through the grid bed 6 from the transport r*(';t7. Cement clinker is sorted by a grinder nozzle 11, and coarse cement clinker is crushed by a crusher 10 and then discharged from a discharge outlet 19.

On the other hand, in the casing 2, the space above the clinker layer 2 is divided into two by a partition wall 14 hanging down from the ceiling wall 13 along the transport direction 8.

In the high temperature region 15 on the soil bIE side along the transfer direction 8 with respect to the partition wall 14, the temperature of the cooling air that has passed through the clinker layer 12 is relatively high, and a part of it is used as combustion air for the burner 5. The remaining air is extracted from the bleed air 1'16 and used as combustion air for a calciner or the like. In the low temperature region 7 on the downstream side of the partition wall 14 along the transfer force direction 8, the temperature of the cooling air that has passed through the Tallinn force +·ri 12 is relatively low and is discharged from the exhaust air [A18].

Note that a heat exchanger may be provided in the middle of a duct (not shown) connected to the exhaust port 18 to recover sensible heat from the discharge air having a relatively low IAIX degree.

According to the second invention, a stepped portion 19 is formed in the lattice bed 6 in the low temperature region 17, and by sprinkling water on this stepped portion 19, the tarinka is efficiently cooled.

FIG. 2 is an enlarged cross-sectional view of the stepped portion 19a].

The stepped portion 19 is constructed by connecting an upper lattice floor portion 20 and a lower lattice floor portion 21 with vertically extending vertically extending holes 22. The upper lattice floor portion 20 has an inner grid 24 fixed on a lattice support beam 23 fixed at a fixed position, and a trolley 25.
A movable grid 2 fixed on a grid support beam 26 fixed above.
7 are arranged alternately along the transfer force direction 8. In addition, Taichung 25 is the drive means (Figure jJ not shown)
Accordingly, the movable grating 27 moves in the direction of /J(z).Furthermore, the fixed grating 24 and the movable grating 27 are supplied with cooling air from the ventilation chamber 7. A plurality of holes 29 for flowing through the clinker layer 12.
There are 30 holes in each.

The lower lattice floor portion 21 is a two-tier lattice floor portion 20.1.
! ;Similarly, 1 fixed to the lattice support beam 31,! The il rating elements 32 and the rotational gratings 35 fixed to the grating support beams 34 of the truck 33 are arranged alternately along the transfer direction 8.

” In the two-stage lattice floor portion 20, at the downstream end along the 4× feeding direction 8, there is a fixed portion extending downstream along the conveying direction 8 so as not to form a space 36 between the lower tier lattice floor portion 21 and the lower tier lattice floor portion 21. A grid 37 is provided. If the grid adjacent to the fixed grid 37 on the flow side F along the transport direction 8 is the fixed grid 24 as shown in the figure in order to make the space 36 relatively large, then
Both fixed grids 37 and 24 are fixed to the grid support beam: 38. Note that holes 29 are also formed in the fixed grid 37 extending downstream along the transport direction 8.

The space 36 has a space 1i? along the width direction of the casing 2 (direction perpendicular to the suite in FIG. 2). , ': A plurality of spray nozzles: 39 are provided with spaces between them. These spray pan nozzles 39 are provided at both J1n in a water supply pipe 40, and the water supply 'i'i' 40 is connected to a water supply source (not shown).

The lattice 22 extends in one direction from the lower lattice floor portion 21,
It is bent along the fixed grid 37 and comes into contact with the downstream end of the fixed grid 37 along the transfer force direction 8 . This lattice 22 is the lattice support beam 3
8, and a plurality of IM air boxes 41 for blowing out cooling air from the ventilation chamber 7 toward the space 36 are bored.

In the cooling device 1 constructed in this way (11
At 9, from the 1st level grid floor portion 20 to the lower grid 1
4<Spray nozzle 3 toward the clinker falling in part 2J
Cooling water is sprayed from 9. Moreover, since cooling air is blown into the space 36 from the ventilation holes 41, the cooling water mixes with the cooling air, becomes a mist, and is cooked into the clinker. -1, the clinker is cooled by each
Since the cooling water is in the form of a mist, the cooling water is not locally sprayed toward the clinker, and the water ηXi does not drip from the clinker. In this way, the cooling water that has reached the C1 clinker is completely evaporated, and the previously cooled clinker is efficiently cooled.

In addition, by spraying cooling water toward the clinker falling at the stepped portion 19, it is possible to
Cold water was also applied to the clinker which was at the top of the clinker J and was at a high temperature.

Even if the high-temperature clinker is not in contact with the clinker, the clinker will be mixed in the lower lattice floor section 21, so the cooling water will not completely evaporate due to heat conduction between the clinkers. , so the clinker is efficiently cooled.

Note that the cooling air jetted out from the vent hole 41 also serves to prevent the cooling water from the spray nozzle 39 from dripping along the grid 22.

As another embodiment of the present invention, the mist water amount of each of Mi spray nozzles 39 provided along the width direction of the casing 2 is adjusted according to the clinker cooling Lg in the width direction of the casing 2 using a water adjustment valve (see Fig. r, 1.x via
g: If the difference is %, the clinker will be cooled more efficiently.

Here, a comparison with a conventional cooling device will be made with reference to FIG. The curve in FIG. 3 shows the clinker temperature distribution of the conventional cooling device 6. If 80 g of water is sipped per 1 kg of clinker, the evaporation of the water will remove approximately 53 kcal of heat from 1 kg of clinker, reducing the temperature of the clinker by approximately 255°C. Therefore, in a conventional cooling system that required approximately 38 m to cool clinker to approximately 85°C, the present cooling system uses mist cooling to cool clinker to approximately 85°C, as shown by the broken line.
/3 or the length can be shortened. Furthermore, the air volume per unit decreases as shown in Table 1.

Table 1. FIG. 4 is an enlarged sectional view of the vicinity of the stepped portion 19 of another embodiment of the present invention.
i;: Same reference 1 for the part that does! it't: 'J o i'zu. In this embodiment, in the one-stage grid floor portion 2 (), the movable grid 27 near the stage 19 has a raised protrusion at the downstream end along the transport direction 8. Part 4
2 is formed. For other (1-r configurations, the first
Similar to the L-4 and ug2Iff examples.

Note that on the upstream side of the upper lattice floor portion 20, a movable lattice having an upwardly raised protrusion 42 at the downstream end may be further provided.

According to this embodiment, the upper part and the lower part t16 of the clinker layer 12 are reversed and mixed by the protrusion 42 of the movable lattice 27. Therefore, when the talin force falls at the stepped portion 19, mist-like cooling water is sprayed onto the relatively high-temperature talin, and the cooling efficiency is further improved.

n: In each of the embodiments described above, (
) The upstream end along the transfer direction 8 is a fixed grid 32. Therefore, the tarinka deposited below the space 36 becomes stationary, and there is a risk that the cooling water sprayed on the deposited portion may not evaporate sufficiently and may drip downward from the fixed grid 32. Therefore, as shown in FIG. 5, the movable grating 35 may be used as the grating at the upstream end along the conveyance direction 8 of the lower grating floor portion 21. If this is done, the tarinka will no longer be stationary below the space 36, and the cooling water will be prevented from dripping.

Note that the present invention can be widely implemented not only as a cooling device for Tallinn force but also as a cooling device for powder and granular materials.

As mentioned above, according to Misfire 11J, since the cooling water is sprayed toward the powder and granules falling at the step, the powder and granules can be efficiently cooled, and furthermore, the cooling water is prevented from dripping from the grid floor. be done. Furthermore, since the latent heat of evaporation of water is utilized, the cooling device of the present invention can be downsized, the cooling wind wall unit consumption is reduced, and the power consumption of the cooling fan is reduced. Furthermore, since the amount of air discharged from the cooling device is halved, the device becomes smaller compared to the exhaust air fan, and the power consumption of the exhaust air fan is also reduced. Furthermore, since water can be uniformly sprayed onto the powder or granule, it is possible to prevent water from remaining in the powder or granule, resulting in improved quality.

[Brief explanation of the drawing]

Figure 1 shows a vertical 111 which is a simple 11-tower version of an example of the present invention.
The i-side view, FIG. 2 is an enlarged IQ-i view of the stepped portion 19 (J), the top view is a graph to explain that the cooling device jT is smaller than the conventional one, and FIG. FIG. 5 shows an enlarged cross section N1 near the stepped portion 19 of another embodiment of the present invention.
It is an i-side view. 8... Transfer direction, 14... Partition wall, 15... High temperature area, 17... Low humidity area, 19... Step portion, 2
0... Upper lattice floor part, 21... Lower lattice floor part, 22... Lattice, 24, :32, 37...
Fixed grid, 27, 35... Movable grid, 36... Space, 39... Spray percentage nozzle, 41... Ventilation hole, 42...
・Tsube's agent Patent attorney Kei Nishi

Claims (3)

[Claims] (1) IJ movable gratings that reciprocate in the transfer direction and are provided in multiple rows in the width direction and fixed gratings that are provided in multiple rows in the width direction are alternately arranged along the transfer direction. The bed is formed into a culm, and cooling air is circulated in the direction from below the lattice bed to cool the powder and granules on the lattice bed, and the comparison is made by heat exchange with the granules. In order to collect the cold air that has reached a high temperature, the cooling air at a relatively high temperature is collected in a granular cold air 3+ device in which one side of the lattice floor is partitioned by a partition wall. On the downstream side of the region in the transport direction, a stepped portion is formed in the middle of the grid bed, and the i′Ji of the upper grid bed portion is
At the downstream end in the transfer direction of J, there is an I++ connection with the lower lattice floor part.
A cooling device for powder or granular material, characterized in that a fixed grid extending downstream in the transport direction is arranged to form a space, and a cooling water spray nozzle is provided in the space. (2) In the vicinity of the stepped portion, the movable grating in the upper grating floor portion is formed with a protrusion that rises upward on the downstream side in the transfer direction. Cooling device for powder and granular material i (i. (3) The lattice that connects the upper lattice floor portion and the lower 414 child floor portion is provided with cooling air that is injected into the space.
A cooling device for powder or granular material as set forth in claim 1 or 2 of the scope of Patent I, characterized in that a ventilation hole is provided.