JPS6248530B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a powder discharge device for a vertical cooling furnace for powder and granule which requires airtightness.

[Conventional technology and problems]

An example of a discharge device for a vertical cooling furnace for powder and granular materials that requires airtightness is a discharge device for discharging cooled coke from a vertical cooling furnace of a coke dry extinguishing facility. In these facilities, reducing the height of the equipment is important in terms of reducing equipment costs. Conventionally, coke was cut out in batches from the bottom of a vertical cooling furnace through a cut gate, as was the case with the Soviet Union's Gipro coke. The material is airtight using a seal hopper with a double seal valve, and after being unloaded to Cork Wharf, it is continuously discharged to a delivery belt conveyor at a wharf gate, so it was unavoidable that the overall height of the discharge device would be large. .

Furthermore, in Japanese Patent Application Laid-open No. 57-36184, a method of continuous cutting from a vertical cooling furnace is proposed.
In this method, the airtight means still relies on a seal hopper having a double seal valve, so the height of the discharge device remains high.

Furthermore, as shown in Fig. 1, a method is known in which a rotary valve 1 is placed directly facing the powder outlet 5 of a vertical cooling furnace 2, but this method causes crushing due to undesired coke entrainment, and reduces the load. It is difficult to put it into practical use because of the disadvantages that the rotor 3 and casing 4 are subject to significant wear and the airtight function is no longer guaranteed after a short period of operation.

The present invention solves the above-mentioned problems and provides an inexpensive discharge device that can continuously discharge powder and granular materials while maintaining airtightness, and further reduces the height of the entire equipment.

[Means for solving problems]

The present invention provides a discharging device for a vertical cooling furnace for powder and granular materials, in which a conveying device for continuously and quantitatively feeding out the powder and granules is provided below the powder outlet of the vertical cooling furnace, and A rotary valve is provided at the discharge section of the conveying device, and an airtight chamber is provided which communicates the powder outlet of the cooling furnace with the inlet of the rotary valve and isolates the conveying device from the outside air. The joint between the chute wall of the rotary valve supply port and the outer periphery of the rotary valve casing is formed so as to be located far from the falling locus of the powder and granular material, and the rotary valve discharge port is opened from near horizontally. This is a discharge device for a vertical cooling furnace for powder and granular material, characterized in that it is configured to be able to control the supply amount to be smaller than the powder and granular material cutting capacity of a valve.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

FIG. 2 shows an example in which a vibrating feeder 7, which is a conveying device, is provided in an airtight chamber 6 at the lower part of the powder outlet of a vertical cooling furnace 2, and a rotary valve 1 is provided at the discharge portion of the vibrating feeder 7. In the figure, 3 is a rotor, 4 is a casing, and 8 is a blade of the rotor.

The rotor 3 is preferably provided with a side plate 9, as shown in FIG.
It is further discharged from the rotary valve 1 and conveyed by a delivery belt conveyor 13.

The vibrating feeder 7 has a particularly large grain size (200mm
Other than the above), the quantitative cutting performance is good, so it is necessary to ensure that each space (room) consisting of the rotor blades 8 and side plate 9 is not supplied in excess of its capacity. It is possible to introduce granules by controlling the feed rate to avoid Further, by providing the vibrating feeder 7 on the upstream side of the rotary valve 1, it is possible to make the falling flow rate width b of the particulate matter smaller than the opening width a of the supply port 5 of the rotary valve 1. In addition, by locating the joint between the rotary valve supply port's chute wall 14 facing the rotor rotation direction and the outer periphery of the rotary valve's casing 4 at a distance from the falling locus of the powder and granules, the gap between the rotor blades 8 and the casing 4 is increased. This prevents powder and granules from getting caught in the container.

In addition, wear of the tips of the rotor blades 8 exposed to the falling flow of powder and granules at the supply port 5 poses a problem.
Since the falling speed of the powder and granular material supplied to the supply port 5 can be minimized, the powder can be supplied softly, and the wear conditions at the tips of the blades 8 of the rotor can be made favorable. Moreover, the wear in this part is local, and even if a wear-resistant material such as high Cr cast iron is used, the equipment cost of the rotary valve 1 as a whole does not pose a problem. If high-pressure airtightness is required, a super wear-resistant material such as silicon nitride ceramic should be used for this part, or a replacement structure should be used and replaced periodically to maintain a high degree of airtightness. can.

Also, the discharge port 15 of the rotary valve is connected to the casing 4.
The opening is made near the horizontal to avoid wear due to contact and rotation of the powder and granules. In this way, the powder filled in the rotor is discharged without coming into contact with the casing, thereby eliminating wear on the casing due to the powder and reducing the frequency of maintenance. Note that in consideration of improving the airtightness of the rotary valve, it is better to make the outer periphery of the casing as long as possible, so the starting point of the opening should not be raised above point C.

Furthermore, the vibration feeder 7 is inexpensive, sufficiently durable, and highly practical. Particularly, the compactness of the quantitative cut-out device is important for the present invention, and not only the discharge device but also the entire cooling furnace can be made low-profile, which reduces equipment costs.

Another embodiment of the present invention is shown in FIG. 4, in which an apron feeder is used as a quantitative cutting device upstream of a rotary valve.

In the figure, 10 is an apron feeder, and other symbols refer to the same parts as in FIG. 2 of the above embodiment.

The feature of the apron feeder 10 is that it has excellent quantitative cutting performance even when cutting out large-sized powder particles, and is the most excellent in terms of quantitative cutting performance. In this combination, it is preferable to provide a small chute 11 in order to narrow down the flow width b of the supplied powder and granule to prevent the rotary valve 1 from getting caught in the powder and granule.

As yet another embodiment, an example in which a roll feeder is used as a quantitative cutting device upstream of a rotary valve is shown in FIG.

In the figure, 12 is a roll feeder, and the other symbols refer to the same parts as in FIGS. 3 and 4 of the above embodiment.

The roll feeder 12 is characterized by its simple structure, excellent durability, and low cost. Further, as in the case of the combination of the apron feeder and the rotary valve, it is preferable to provide a small chute 11 at the discharge portion of the roll feeder 12 in order to prevent the powder from being caught in the rotary valve 1.

〔Effect of the invention〕

The present invention configured as described above has the following effects.

Since the powder and granules can be continuously discharged while maintaining the airtightness of the vertical cooling furnace, there is no need for equipment to temporarily store the powder and granules, such as a coke wharf or a seal hopper.

Furthermore, since a rotary valve is used instead of a double seal valve to maintain the airtightness of the vertical cooling furnace, the height of the discharge device is reduced. Therefore, the overall cost of the equipment for the vertical cooling furnace is reduced.

The joint between the rotary valve supply port's chute wall facing the rotor rotational direction and the outer periphery of the rotary valve casing is located far away from the falling trajectory of the powder and granules, so that the powder and granules are caught between the rotor blades and the casing. You won't have to worry about it.

By preventing the rotor from being filled with powder and granules and by opening the rotary valve outlet near the horizontal, the powder does not come into contact with the inner surface of the casing, thereby eliminating wear on the inner surface of the casing.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional explanatory diagram showing an example of a conventional method in which a rotary valve is installed at the bottom of a vertical cooling furnace for powder and granular materials, and Figure 2 is a vibrating feeder installed at the bottom of a vertical cooling furnace for powder and granular materials. A cross-sectional explanatory diagram showing an embodiment of the present invention in which a rotary valve is provided in the discharge section of a vibrating feeder, FIG. 3 is a perspective view of the rotor of the rotary valve used in the present invention, and FIG. 4 is a vertical type cooling for powder and granular materials. A cross-sectional explanatory view showing an embodiment of the present invention in which an apron feeder is provided at the bottom of the furnace and a rotary valve is provided at the discharge part of the apron feeder. Established Ida;
FIG. 2 is an explanatory cross-sectional view showing an embodiment of the present invention in which a rotary valve is provided in the discharge section of the roll feeder. 1... Rotary valve, 2... Vertical cooling furnace, 3
... rotor of rotary valve, 4 ... casing of rotary valve, 5 ... supply port of rotary valve,
6... Airtight chamber, 7... Vibration feeder, 8... Rotor blade, 9... Rotor side plate, 10...
Apron feeder, 11... Shoot, 12...
...roll feeder, 13...discharge belt conveyor, 14...chute wall of rotary valve supply port facing the rotor rotation direction, 15... rotary valve discharge port.

Claims (1)

[Claims] 1. In the discharge device of a vertical cooling furnace for powder and granular materials,
A conveying device for continuously and quantitatively feeding out the powder and granules is provided below the powder outlet of the vertical cooling furnace, and a rotary valve is provided at the discharge part of the conveying device, so that the powder in the cooling furnace is An airtight chamber is provided that communicates the granule outlet with the inlet of the rotary valve and isolates the conveying device from the outside air, and the chute wall of the rotary valve supply port facing the rotor rotation direction is joined to the outer circumference of the rotary valve casing. The part is formed so that it is located far from the falling locus of the powder and granular material,
Discharge of a vertical cooling furnace for powder and granular materials, characterized in that the rotary valve discharge port opens from near horizontally, and the conveying device is configured to be able to control a supply amount smaller than the powder and granule cutting capacity of the rotary valve. Device.