JPH0756025B2 - Coke dry fire extinguisher cooling tower gas outlet flue - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to the use of a gas when a gas that has become high in temperature due to heat exchange with red hot coke in a cooling tower of a coke dry fire extinguisher is sent to a heat exchanger such as a boiler. Gas outlet flue with less particulate matter associated with the exhaust stream of.

[Prior Art] As a means of cooling the red hot coke while recovering the sensible heat of the red hot coke extruded from the coke oven, the red hot coke batch-charged into the cooling tower is temporarily stored in the pre chamber, and this pre chamber A known coke dry fire extinguishing system is one in which it is continuously dropped into the cooling zone.

Fig. 4 shows a coke dry fire extinguisher equipped with this sensible heat recovery system.

The red hot coke from the coke oven is charged into the prechamber 3 through the charging port 2 provided at the top of the cooling tower body 1. Then, it is gradually dropped into the lower cooling chamber 4 and is heated to about 200 ° C. by heat exchange with the inert gas blown from the gas blowing port 5.
Cooled to a degree. The cooled coke is cut out from the discharge port 6 by the cutting device 7. On the other hand, the inert gas heated to about 800 ° C by heat exchange is collected from the exhaust port 8 into the annular duct 9, and passes through the duct 10 to the boiler.
Guided by 11. Water is supplied from the inflow pipe 12 to the boiler 11, and the water is taken out from the outflow pipe 13 as hot water or steam that has absorbed the heat of the inert gas sent from the duct 10.

At this time, a large amount of powder particles and dust separated from the coke are suspended in the inert gas flowing in the duct 10 toward the boiler 11. Boiler 11
If it is fed into the boiler 11, the heat transfer tube in the boiler 11 will be worn away and these powder particles and dust will be accumulated inside the boiler 11, causing the boiler 11 to malfunction. Therefore, a dust collector 14 is attached in the middle of the duct 10 to remove dust particles and dust in the inert gas. The particles and dust separated from the inert gas by the dust collector 14 are carried out of the system via the discharge pipe 15.

As the dust collector 14 provided in the duct 10, the collision plate 16 on which the powder particles and the dust floating in the inert gas collide is projected in the middle of the flow passage, and the flow passage cross-sectional area near the collision plate 16 is provided. The larger one is used. This type of dust collector
14 has the advantages that the structure is simple and the burden on maintenance is reduced. However, when the amount of powder and dust accompanying the inert gas flowing out from the exhaust port 8 becomes large, the dust collector 14 cannot completely capture the powder and dust, and a part of the powder and dust flows into the boiler 11. In addition, if coke lumps accompany the inert gas, the dust collector
14 will be damaged and it will not be possible to continue operation of the equipment.

Therefore, in order to prevent a large amount of powder particles or coke lumps from being trapped in the inert gas flowing from the exhaust port 8 to the annular duct 9 by rising inside the cooling tower body 1, the furnace wall structure of the exhaust port 8 is adopted. Various improvements have been added.
No. 747, No. 599067, No. 59-153345, No. 60-36574, etc.).

[Problems to be Solved by the Invention]

However, as shown in FIG. 5, the conventional exhaust port 8 has a columnar portion 18 which is continuous with the inner surface of the upper furnace wall 17 and which partitions the exhaust ports 8 from each other. It is designed to be continuous with the inner surface of the lower furnace wall 19. At this time, the pillar portion 18 vertically stacks the individual brick blocks from the lower furnace wall 19 toward the upper furnace wall 17. In such brick laying, the inclination angle α of the columnar portion 18 cannot be made small in view of its structure. Therefore, the inclination angle α of the columnar portion 18 is larger than the repose angle of the coke mass 20 descending in the furnace.
Is getting bigger.

Therefore, the coke lump 20 coming down the cooling tower body 1
Enters from a lower end of the upper furnace wall 17 into a part of the exhaust port 8 in an inclined state. When the inert gas flow 21 rising from the lower side of the cooling chamber 4 flows into the exhaust port 8, coke lumps
The flow velocity of the inert gas flow 21 increases as it gets closer to the lower end of the upper furnace wall 17 depending on the distribution of 20 and the layer thickness.

Therefore, the coke mass 20 near the lower end of the upper furnace wall 17 is blown off by the inert gas flow 21 and is carried to the annular duct 9 at a high rate. The scattering of the coke lumps 20 becomes more remarkable as the amount of the inert gas fed into the cooling tower body 1 increases as the equipment becomes larger. Further, the amount of powder particles other than the coke lump 20 that accompanies the inert gas flow 21 is also increased.

To prevent the scattering of coke lumps and powder particles,
As shown in FIG. 6, it is possible to divide the exhaust port 8 into multiple stages by a plurality of or a single partition wall 22 in “Iron and Steel” Vol 74 (1988).
No. 6, pp. 30-37. With this partition wall 22, the coke lump 20 in the exhaust port 8 is separated from the partition wall 22.
It has an upper surface 20a and a lower surface 20b. Comparing the deposition state of the coke lump 20 with the case of FIG. 5, the deposition thickness of the coke lump 20 when viewed in the flow direction of the inert gas flow 21 is about half. Therefore, the difference in the ventilation resistance between the upper furnace wall 17 directly below and the partition wall 22 directly above, and between the partition wall 22 directly below and the lower furnace wall 19 directly above is small, and is directly below the upper furnace wall 17 and directly below the partition wall 22. The tendency of the inert gas flow 21 to concentrate is also suppressed. As a result, the coke lumps 20 and powder particles blown off by the inert gas flow 21 are reduced.

The partition wall 22 is provided, for example, as protruding from the side surface of the columnar portion 18. Therefore, a specially manufactured irregular shaped brick is required as the columnar portion 18, and it is not easy to attach it to existing equipment. Moreover, since there is the upper surface 20a and the lower surface 20b that make the deposition thickness of the coke lump 20 different when viewed in the flow direction of the inert gas flow 21, the flow distribution of the inert gas flow 21 passing through the exhaust port 8 is 8 is not uniform in the cross section. Therefore, some coke lumps 20 and powder particles may be taken out from immediately below the upper furnace wall 17 or the partition wall 22 having a high flow velocity.

Therefore, the present invention prevents the inert gas passing through the exhaust port from locally concentrating on the upper furnace wall side by forming a gap in which the inert gas flow positively flows on the lower furnace wall side. The purpose is to prevent and prevent entrainment of coke lumps and powder particles.

[Means for Solving the Problems]

In order to achieve the object, the cooling tower gas outlet flue of the present invention is divided into an annular duct provided around the cooling tower and an exhaust port connecting the inside of the furnace with a lower furnace wall, an upper furnace wall and a columnar portion, A plurality of groove portions extending in the flow path direction of the inert gas flow passing through the exhaust port are formed on the lower furnace wall side corresponding to at least the inlet side portion of the exhaust port, and the cross-sectional shape of the groove portion is deeper than the inlet portion. Is characterized in that it is formed wider.

〔Example〕

Hereinafter, the features of the present invention will be specifically described by way of examples with reference to the drawings.

FIG. 1 shows an embodiment in which a groove is formed in a lower furnace wall 19 forming a part of the exhaust port 8, and FIG. 2 shows a structure seen from line AA in FIG.

In the figure, the members corresponding to the members of the conventional example shown in FIG. 5 are denoted by the same reference numerals, and in the following description, the conventional examples shown in FIG. 4 and FIG. Numbers are used as appropriate.

In the outlet flue of this embodiment, the columnar portion 18 is arranged between the upper furnace wall 17 and the lower furnace wall 19 to form the exhaust port 8 as in the case of FIG. As shown in FIG. 4, a plurality of columnar parts 18 are provided along the inner peripheral surface of the cooling tower body 1, and the exhaust port 8 is provided between the respective columnar parts 18.

On the inner wall surface of the lower furnace wall 19 forming the lower surface of the exhaust port 8, a plurality of grooves, that is, gas passages 26 are provided along the passage direction of the inert gas flow 21. Therefore, between the coke lump 20 that has entered the inlet side of the exhaust port 8 and the inner wall surface of the lower furnace wall 19,
A void is formed. This void reduces the pressure loss of the inert gas flow 21 passing through the lower furnace wall 19 side. As a result, the flow rate of the inert gas flow 21 passing through the upper furnace wall 17 side decreases, and the flow rate of the inert gas flow 21 passing through the lower furnace wall 19 side increases.

As the groove portion formed in the lower furnace wall 19, that is, the gas passage 23,
A rail-type brick (24) is formed on the upper inclined portion of the lower furnace wall (19) so that a space is formed between the coke cake (20) and the lower furnace wall (19).

In this way, the area of the groove formed by the rail-shaped brick 24, that is, the area of the gas passage 23 can be secured according to the amount of the inert gas for cooling. Further, at this time, the upper portions of the adjacent railroad bricks 24 may be arranged so as to be in contact with each other.

FIG. 3 is a graph showing the flow rate distribution of the inert gas flow 21 passing through the exhaust port 8 in the case of the embodiment of the present invention. As is clear from the figure, the lower furnace wall 19 and coke lumps
Since the inert gas flow 21 preferentially passes through the gap formed between 20 and 20, the flow rate of the inert gas flow 21 flowing on the side of the upper furnace wall 17 decreases, and the flow rate distribution with respect to the cross section of the exhaust port 8 is reduced. Averaged. Therefore, the coke lump 20 is not accompanied by the inert gas flow 21 in the vicinity of the upper furnace wall 17.

On the other hand, in the conventional exhaust port 8 described with reference to FIG. 5, the pressure loss due to the penetration of the coke lump 20 is different in the cross section of the exhaust port 8, so that it is extremely large on the side of the upper furnace wall 17 as shown by the broken line. . The coke lump 20 is accompanied by the inert gas flow 21 near the upper furnace wall 17 where the flow rate is large, and is sent out of the furnace.

〔The invention's effect〕

As described above, in the present invention, a groove is formed on the lower furnace wall side that forms the lower surface of the exhaust port, and a gap is formed between the coke mass that has entered the inlet side of the exhaust port and the lower furnace wall side. Is formed. Coke lumps do not enter this void, so the pressure loss is small and the inert gas flow passes preferentially. Therefore, the flow rate of the inert gas flow passing through the upper furnace wall side is reduced, the inert gas does not concentrate immediately under the upper furnace wall and does not flow at a high speed, and coke lumps and powder particles are prevented from being entrained. As a result, troubles due to coke lumps and powder particles taken out from the cooling tower can be avoided and stable operation can be performed even if the amount of inert gas blown in is increased with the increase in the size of coke dry fire extinguishing equipment. It will be possible.

[Brief description of drawings]

FIG. 1 is a sectional view showing an outlet flue according to an embodiment of the present invention,
FIG. 2 is a sectional view taken along the line AA of FIG. FIG. 3 is a graph specifically showing the effect of the present invention. FIG. 4 is a schematic view showing the overall structure of the coke dry fire extinguishing equipment, and FIGS. 5 and 6 are sectional views showing a conventional outlet flue. 1 ... Cooling tower body, 2 ... Input port, 3 ... Pre-chamber 4 ... Cooling chamber, 5 ... Gas injection port, 6 ... Coke discharge port, 7 ... Cutting device, 8 ... Exhaust port, 9 …… Annular duct 10 …… Duct, 11 …… Boiler, 12 …… Inflow pipe 13 …… Outflow pipe, 14 …… Dust collector, 15 …… Discharge pipe 16 …… Collision plate, 17 …… Upper furnace wall , 18: columnar section 19: lower furnace wall, 20: coke lump, 20a: upper surface 20b: lower surface, 21: inert gas flow, 22: partition wall 23: groove or gas passage , 24 …… Rail type brick

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yuichi Yamamura Yuichi Yamamura Oita-shi, Oita 1 Nishinosu, Oita-shi, Nippon Steel Co., Ltd. Inside Oita Works (56) References Sho 59-145546 (JP, U)

Claims (1)

[Claims] 1. An exhaust port for connecting an annular duct provided around a cooling tower to the interior of a furnace is divided into a lower furnace wall, an upper furnace wall and a columnar portion, and the lower furnace wall corresponding to at least an inlet side portion of the exhaust port. On the side, a plurality of groove portions extending in the direction of the flow path of the inert gas flow passing through the exhaust port are formed, and the cross-sectional shape of the groove portions is formed so that the inner side is wider than the inlet side. Flue for gas outlet of cooling tower of fire extinguishing equipment.