JPH0647000Y2 - Coke dry fire extinguisher cooling tower gas outlet flue - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is applied to the case where a gas heated to a high temperature by 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 the pre chamber A known coke dry fire extinguishing system is one in which it is continuously dropped into the cooling zone.

Fig. 3 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 to the boiler 11 from an inflow pipe 12, 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 may be worn away, or these powder particles may accumulate inside the boiler 11, causing the boiler 11 to malfunction. So the duct
A dust collecting device 14 is attached in the middle of 10, and the dust collecting device 14 removes 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 through 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 particles accompanied by the inert gas flowing out from the exhaust port 8 increases, the dust collector 14 cannot completely capture the powder particles, and some of the powder particles flow into the boiler 11. Further, if coke lumps accompany the inert gas, it causes the dust collector 14 to malfunction, making it impossible to continue the 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.
747, 59-9067, 59-153345
No. 60-36574, etc.).

[Problems to be solved by the device]

However, as shown in FIG. 4, the conventional exhaust port 8 is continuous with the inner surface of the upper furnace wall 17 to form a pillar brick 18 that partitions the exhaust ports 8 from each other. Lower furnace wall 19
It is designed to be continuous with the inner surface of the. Therefore, the coke lump 20 falling from the cooling tower main body 1 enters from the 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 below the cooling chamber 4 flows into the exhaust port 8, the inert gas flow 21 becomes closer to the lower end of the upper furnace wall 17 depending on the distribution of the coke mass 20. The flow rate increases. 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. In addition, the coke lump 20 accompanying the inert gas stream 21
Other powders are also added.

The present invention bypasses the inert gas flow rising from below the cooling chamber at a position below the exhaust port,
The purpose is to reduce the flow rate of the inert gas flowing through the exhaust port and prevent the outflow of coke lumps and powder particles from the cooling tower to the duct and the boiler.

[Means for Solving the Problems]

In order to achieve the object, the cooling tower gas outlet flue of the present invention is provided with a cooling chamber on the furnace wall below the exhaust port connecting the inside of the furnace to the annular duct provided around the cooling tower of the coke dry fire extinguisher equipment. The opening of the inlet side opening of the sub-flow path for bypassing the rising inert gas, the sub-flow path is provided inside or outside the furnace wall, and the outlet-side opening of the sub-flow path is It is characterized by opening in the furnace wall above the coke lumps accumulated in the exhaust port.

〔Example〕

Hereinafter, the features of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows an example in which a sub-channel is provided inside the furnace wall of the cooling tower. In the figure, components corresponding to the members shown in FIG. 4 are designated by the same reference numerals, and the reference numerals in FIGS. 3 and 4 are used as appropriate in the following description.

In the outlet flue of this embodiment, as in the case of FIG. 4, a pillar brick 18 is arranged between the upper furnace wall 17 and the lower furnace wall 19 to form the exhaust port 8. Below the exhaust port 8, the sub-channel 22
Are formed. This sub-channel 22 has an inlet side opening 22a in the furnace wall below the exhaust port 8 and an outlet side opening 22b in the furnace wall above the coke mass 20 accumulated in the exhaust port 8.
With.

A part of the inert gas flow 21 rising in the cooling chamber 4 is
And becomes a bypass flow 21a via the outlet side opening portion 22b and flows into the annular duct 9 through the outlet side portion of the exhaust port 8. Then, the flow rate of the inert gas flow 21 passing through the exhaust port 8 decreases by the flow rate of the bypass flow 21a. As a result, the wind pressure applied to the coke lump 20 accumulated in the exhaust port 8 is reduced, and in particular, the coke lump 20 and powder particles near the lower end of the upper furnace wall 17 are prevented from scattering.

In order to effectively suppress the increase of the wind pressure at the exhaust port 8 by the bypass flow 21a, it is preferable to provide the inlet side opening 22a of the auxiliary flow path 22 in the furnace wall within 1000 mm below the exhaust port 8. When the position of the inlet side opening 22a is too far below the exhaust port 8, the inert gas flows into the exhaust port 8 through the auxiliary flow path 22 without being sufficiently used for cooling the coke in the cooling chamber 4. I will be depressed.

The flow passage cross-sectional area of the sub-flow passage 22 varies depending on the facility operation and operating conditions of the cooling tower body 1, but from the total amount of inert gas required to cool the red hot coke in the cooling chamber 4, the exhaust port 8 It is necessary to secure a flow passage cross-sectional area sufficient to pass an inert gas flow of a flow rate obtained by subtracting the flow rate of the inert gas flow 21 in which the scattering of coke lumps and powder particles is within the allowable range. The flow rate of the inert gas flow 21 within which the scattering of coke lumps and powder particles at the exhaust port 8 is within the allowable range can be easily obtained experimentally by the equipment.

FIG. 2 shows an example in which the auxiliary flow path 22 is provided outside the furnace. In this example, the sub-channel 22 is made of a tube made of a refractory material or a heat-resistant metal material, both ends of the tube are penetrated through the furnace wall and opened in the furnace, and the inlet side opening 22a and the outlet side opening are formed. 22b. Further, a damper 23 is provided in the middle of the inlet side opening 22a and the outlet side opening 22b, and the operation of the damper 23 opens and closes the sub-channel 22. That is, when the flow rate of the inert gas blown into the cooling tower main body 1 is large and the coke lumps 20 and the powder particles are expected to be scattered, the sub passage 22 is opened and the inert gas flow passing through the exhaust port 8 is opened. Reduce the flow rate of 21. On the other hand, when the amount of the inert gas blown is small, the sub-flow path 22 is closed so that the entire amount of the inert gas passes through the exhaust port 8.

Next, a concrete operation result will be described. Channel cross-section area 0.1m
A cooling tower was used in which the inlet side opening 22a of the sub-channel 22 having m ² was opened to the furnace wall below the exhaust port 8. Red hot coke having a temperature of 1050 ° C. was charged into this cooling tower, and cold coke was taken out at a rate of 2500 kg / min. At this time, the flow rate of the inert gas blown into the cooling chamber 4 was set to 3800 Nm ³ / min.

The flow rate of the inert gas stream 21 flowing through the exhaust port 8 was measured and found to be 3250 Nm ³ / min. On the other hand, the flow rate of the bypass flow 21a flowing through the auxiliary flow path 22 was 550 Nm ³ / min. And
The amount of powder particles brought out of the cooling chamber 4 by the inert gas flow 21 was 50 kg / min, and no coke lump was contained.

On the other hand, when the red hot coke was cooled under the same conditions using a cooling tower not equipped with the sub-channel 22, the exhaust port 8
The flow rate of the inert gas stream 21 flowing through is 3800 Nm ³ / min, 1
It was accompanied by powder particles of 00 kg / min. Also, in the powder particles,
A small coke block was also included.

[Effect of device]

As described above, in the present invention, the flow rate of the inert gas flow passing through the exhaust port is reduced by providing the sub-flow path below the exhaust port. Therefore, the wind pressure applied to the coke lumps accumulated in the exhaust port is suppressed, and the coke lumps and powder particles are not entrained in the inert gas flow, or the entrained amount can be reduced. as a result,
Even if the amount of inert gas blown in is increased with the increase in the size of coke dry fire extinguishing equipment, troubles caused by coke lumps and powder particles taken out from the cooling tower can be avoided and stable operation can be performed. .

[Brief description of drawings]

Figure 1 shows the outlet flue with the sub-channel built into the furnace wall,
FIG. 2 shows an outlet flue provided with a sub-flow passage outside the furnace. On the other hand, FIG. 3 shows the conventional coke dry fire extinguishing equipment, and FIG.
The figure is for explaining the problem near the exit flue. 1: Cooling tower body, 4: Cooling chamber 8: Exhaust port, 9: Annular duct 21: Inert gas flow, 21a: Bypass flow 22: Sub flow path, 22a: Inlet opening 22b: Outlet opening, 23 : Damper

Claims (1)

[Scope of utility model registration request] 1. An inlet side of a sub-flow passage for bypassing an inert gas rising in a cooling chamber to a furnace wall below an exhaust port connecting the inside of the furnace to an annular duct provided around a cooling tower. An opening is opened, the sub-channel is provided inside or outside the furnace wall, and the outlet side opening of the sub-channel is opened in the furnace wall above the coke lump accumulated in the exhaust port. This is a cooling tower gas outlet flue for coke dry fire extinguishing equipment.