JPH0335754Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cooling tower of a coke dry extinguishing system, which is a countercurrent moving bed type heat exchanger.

[Prior Art] As shown in Figs. 7 and 8, the lower part of the cooling tower of coke dry extinguishing equipment includes a funnel portion 4 formed into a lower squeeze with an appropriate inclination, and a conical body. A blast head 5 is provided at the center (axial center position), a coke cutting port 6 is provided at the lower end of the funnel portion 4, and extends radially from the funnel portion 4 across the lower part of the packed bed. A cooling gas distributor 7 is connected to and supports the blast head 5.

The cone of the blast head 5 is a well-known cone provided in a powder storage tank, etc., and is used to eliminate so-called rat holes and cause the coke to fall uniformly in the radial direction.

Further, as shown in FIG. 9, the cross-sectional shape of the distributor 7 is formed into a chevron-shaped upper part so as to reduce the resistance to the descending coke.

[Problems to be Solved by the Invention] In the above-mentioned conventional cooling tower, the distributor 7 had a considerable influence on the descent of coke.

That is, as shown in FIG. 7, a portion B is generated near the center of the area circumferentially divided by the distributor 7, where the descending speed is higher than that of the surrounding area.

In this region B where the speed is high, even if the cooling gas is flowing uniformly, the amount of cooling gas is too small for the unit amount of coke passing, making it difficult to cool down.Furthermore, due to the rise in gas temperature, the gas flow rate in the inter-coke gap further increases. As the size increases, it becomes increasingly difficult for cooling gas to flow. On the other hand, in areas where the coke descent rate is low, even if the cooling gas is flowing uniformly, the amount of cooling gas relative to the unit amount of coke passing through becomes excessive and the temperature rise in the gas is small. The gas flow velocity becomes even smaller, making it easier for the cooling gas to flow.

Therefore, the temperature of the coke in part B, where the coke fall rate is high, is higher than the average temperature, and therefore, the total amount of cooling gas must be increased until the coke temperature in this part B reaches the target temperature or less. There was a problem.

Such a problem also occurs in cases other than the case where there is only one distributor 7 and two cutting ports 6 are arranged directly below it as shown in FIG. A structure in which the outlet 6 is separated from the distributor 7 (10th
), a structure in which two distributors 7 are perpendicular to each other (see FIG. 11), and a structure in which four cutting ports 6 are provided (see FIGS. 12 and 13), the descending A portion B with a high speed occurs.

In view of the above-mentioned circumstances, the present invention was devised to provide a cooling tower for coke dry extinguishing equipment that can eliminate the non-uniformity of the rate of descent caused by the distributor.

[Means for Solving the Problems] The present invention includes a blast head crowned with a cone and provided in a cooling tower, and a cooling gas distribution extending radially at the bottom of the cooling tower to support the blast head. In a cooling tower for a coke dry extinguishing system having a cone, the cone has a symmetrical shape with respect to a diameter line perpendicular to the axis of extension of the distributor, and extends from the outer peripheral end of the cone, and extends from the distributor in the circumferential direction. It is provided with spaced apart overhangs.

[Function] With the above configuration, the overhang portion increases the passage resistance near the center of the area circumferentially divided by the distributor, and in combination with the action of the cone, cools the descending speed of coke. Uniform over the entire cross section of the tower.

[Examples] Examples of the present invention will be described below with reference to the accompanying drawings.

FIGS. 1 and 2 show an embodiment of a cooling tower for a coke dry extinguishing system according to the present invention.

This cooling tower has, as in the past, a blast head 13 provided at its lower part 10 and crowned with a conical body 13a for uniformly descending coke in the radial direction;
The cooling gas distributor 14 has a predetermined member width and extends radially below the packed bed to support the blast head 13. The air is blown up from the bottom into the packed bed.

A projecting portion 13b, which is a feature of the present invention, is provided on the outer peripheral end 16 of the conical body 13a. Further, in this embodiment, two coke cutting ports 15 following the lower end of the funnel portion 11 are arranged in parallel along the extended axis 17 of the distributor 14.

As shown in FIG. 2, the projecting portion 13b is perpendicular to the extension axis 17 of the distributor 14 and
It is formed in a symmetrical shape with respect to a horizontal line (diameter line) 18 passing through the center of the cone 13a, and extends radially outward from the outer peripheral end 16 of the cone 13a by a uniform length. . The length in the circumferential direction is approximately 2/3 of the half circumference of the outer peripheral end 16 of the conical body 13a, and both ends are located at a predetermined interval from the distributor 14 in the circumferential direction. has been done.

Therefore, when viewed in the radial direction, the annular bottleneck 12 formed between the conical body 13a and the funnel portion 11 is blocked by the distributor 14 up to the inner wall of the funnel portion 11, and is also blocked by the distributor 14 up to the inner wall of the funnel portion 11. A part of the area other than the vessel 14 is partially blocked by the overhanging portion 13b.

That is, as shown in FIG. 4, there is a relationship in which the descending speed V of coke passing through the annular confinement 12 becomes faster as the width of the annular confinement 12 increases, and by appropriately selecting the size of the overhang portion 13b, Therefore, the non-uniformity of the descending speed V caused by the distributor 14 can be eliminated.

By making this descending speed V uniform, the amount of cooling gas per unit weight of coke becomes uniform in each part of the packed bed, and the heat exchange performance is significantly improved and the amount of cooling gas can be reduced. It is possible to downsize the entire fire extinguishing equipment.

Furthermore, since the present invention has an extremely simple configuration, it can be easily applied to conventional cooling towers, and is highly versatile.

FIG. 3 shows another embodiment of the present invention, in which four cutting ports 15 are provided along the circumferential direction of the conical body 13a. In this configuration, the projecting portion 13b is omitted at the position of the diameter line 18, and extends near the center of each region divided into four by the extension axis 17 and the diameter line 18.

FIG. 5 shows another embodiment applied to the cooling tower of FIG.
It is formed in an elliptical shape with the major axis being . In this way, the cone 13a and the overhang 19
It has the advantages of being relatively easy to process and having high strength.

Next, the contents of a coke descent test in a cooling tower conducted by the present inventors in order to confirm the effects of the present invention will be described.

This drop test was conducted using the cooling tower shown in Figures 1 and 2. Coke was charged into the cooling tower, and a marker was placed on a predetermined planar coordinate using a template. Alternately cut coke from the outlet, record the position (number) of the identified balls found in the coke, the number of times they were cut out (discharge order), and which cutout, and calculate the coke descending speed V in the cooling tower. The distribution in plan view was determined.

The test results are shown in Figure 6 (upper and lower rows) as a descending constant velocity diagram and a speed distribution diagram. In the same figure,
For comparison, conventional configurations (A) and (C) and the present invention (B) and (D) are shown side by side.

Comparing both constant velocity diagrams shown in the upper part of the same figure, it is found that in the conventional one, the intervals between the constant velocity lines are narrow and dense, and in A and B, the part of the extended axis 17 and the diameter line 18 The rate of descent differs greatly between the two. In addition, in the case of the present invention, the intervals between the constant velocity lines are wide and sparse, and there is almost no difference in the descending speed between the extension axis 17 section and the diameter line 18 section, and the descending speed, which was uneven in the past, has been significantly reduced. You can see that it has been improved.

When comparing the speed ratio region 21 of 0.8 to 1.2 shown as the allowable speed range in the speed distribution diagram, it is found that the conventional model C is slightly distributed around the high speed region 22. On the other hand, in the device 2 of the present invention, although the high speed region 22 and the low speed region 23 remain in some parts, the permissible region 21 is widely distributed, and the overall descending speed is permissible. It can be seen that the value is within the range.

This descent test showed that the present invention reliably eliminates the non-uniform coke descent rate caused by the cooling gas distributor, thus proving the practicality of the present invention.

[Effects of the Invention] In summary, the present invention provides the following excellent effects.

Since a projecting portion is provided which is symmetrical about a diameter line perpendicular to the extension axis of the cooling gas distributor and extends from the outer circumferential end of the cone and is spaced apart from the distributor in the circumferential direction, the distributor The non-uniformity of the coke descent rate in the cooling tower caused by
A significant improvement in heat exchange performance is achieved, making it possible to downsize and improve the performance of the entire coke dry extinguishing equipment.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing one embodiment of the cooling tower of the coke dry extinguishing equipment according to the present invention, Fig. 2 is a plan view thereof, and Fig. 3 is a plan view showing another embodiment of the present invention. , FIG. 4 is a diagram showing the relationship between the descending speed of coke and the annular bottleneck width, FIG. 5 is a plan view showing another embodiment of FIG. 1, and FIG. 6 is a diagram for explaining the effects of the present invention. The conventional descending constant velocity diagram A, the descending constant velocity diagram B of the present invention, the conventional velocity distribution diagram C, the velocity distribution diagram D of the present invention, and Figure 7 show the cooling of the conventional coke dry extinguishing equipment in the cooling tower. A plan view showing the tower, FIG. 8 is a side sectional view thereof, FIG. 9 is a sectional view taken along the line A-A in FIG. 8, and FIGS. 10 to 13 are views of other conventional cooling towers. FIG. In the figure, 13 is a blast head, 13a is a cone, 13b is an overhang, 14 is a cooling gas distributor,
17 is an extended axis of the distributor, and 18 is a diameter line perpendicular to this.

Claims (1)

[Scope of utility model registration request] In a cooling tower of a coke dry extinguishing system, which has a blast head crowned with a cone and provided in the cooling tower, and a cooling gas distributor extending radially at the bottom of the cooling tower to support the blast head. , an overhanging portion extending from the outer circumferential end of the conical body and spaced apart from the distributor in the circumferential direction, having a symmetrical shape with respect to a diameter line perpendicular to the extension axis of the distributor; Cooling tower with coke dry extinguishing equipment.