JP6757111B1 - Coke dry fire extinguishing equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coke dry fire extinguishing system provided with a cooling gas blowing device for improving coke cooling performance. SOLUTION: A cooling gas blowing device that allows coke to pass through a central opening is used to make the coke descent uniform. Further, the cooling chamber volume is increased by reducing the device volume. Both of them evenly extend the coke cooling chamber residence time and improve the coke cooling capacity. [Selection diagram] Fig. 3

Description

The present invention relates to a coke dry fire extinguishing system attached to a coke oven.

FIG. 1 shows the current coke dry fire extinguishing system. Coke dry fire extinguishing equipment is a major energy-saving equipment in the ironmaking process that improves the quality of coke and recovers thermal energy. Many have chambers that are brick-laying cylindrical containers filled with coke. The red-hot coke introduced from above the chamber descends from the pre-chamber 6 and is discharged while being cooled by the cooling chamber 1.

The cooling gas rises in the voids of the coke layer from the lower part of the chamber through the cooling gas blowing device 2. The pressure resistance of the coke layer makes the cooling gas flow uniform to a certain extent. The surface inside the cooling chamber 1 and the surface of the cooling gas blowing device 2 have a characteristic that they can easily pass through due to a slight bias of voids.

FIG. 2 shows the gas flow and the coke flow in the cooling chamber. The cooling chamber has a funnel-shaped narrowing down. The steeper the inclination of the funnel portion 3 is, the easier it is to uniformly discharge coke, but the entire chamber becomes high, which is disadvantageous to the equipment cost. Due to this narrowing down, the coke flow in the chamber tends to stay in the periphery, and the descent speed tends to increase toward the center.

There is a cooling gas blowing device 2 for controlling the coke descent and blowing the cooling gas into the coke layer. The cooling gas is supplied from the outside of the funnel portion 3 to the cooling chamber from the device via the support portion 5.

A certain residence time (time for coke to pass from the height of the lower end of the sloping flue inlet 4 to the lower end of the cooling chamber) is required for coke cooling. It is desirable that the residence time is evenly secured in the entire coke layer. The degree of uniformity of the residence time varies depending on the degree of uniformity of the coke descent of the cooling chamber straight body portion 10. Further, it is necessary to secure the cooling chamber volume (volume from the lower end of the sloping flue inlet to the lower end of the chamber) for a certain residence time.

In order to achieve a more uniform and longer residence time, it is desirable to make the coke descent uniform and increase the cooling chamber volume as a basis. It is rational to bring a uniform gas flow into AC contact with this. On top of that, it is desirable to improve it according to the actual conditions such as the coke layer and the drift of cooling gas that are uniquely generated.

Equal and long residence times improve coke cooling capacity, allowing for increased coke processing and power generation, increased use of cheaper coke raw materials, reduced carbon dioxide emissions and reduced emission of harmful substances. Recently, there have been increasing demands for strengthening combustion in the prechamber, increasing the amount of coke processed by increasing the size of the blast furnace and coke furnace, and upgrading from the Coke Stabilization Quenching process (CSQ), and coke cooling performance is for the ironmaking process. is important.

Improvement of coke cooling performance by cooling gas blowing device has been tackled in the past. Shows recent inventions.

Japanese Patent Application Laid-Open No. 2016-35028 This is an invention for adjusting the blowing balance in the circumferential direction and the radial direction for an umbrella-shaped device which is a standard technique at present. Focusing on the red hot coke particle size distribution after charging, the amount of cooling gas in the radial direction of the device is adjusted according to the drift of the coke layer. The balance of the amount of cooling gas in the circumferential direction is also adjusted to reduce the coke discharge temperature.

Japanese Patent Application Laid-Open No. 2011-207919 Patent Document 2 provides a small blowing device in the space below the funnel portion to which the cooling gas has not sufficiently passed, to make the cooling gas blown uniformly.

The two inventions improve the cooling gas blowing method of the cap-shaped device and improve the coke cooling performance to some extent. However, the Kasagata device is still premised on the equalization and extension of the coke residence time.

As shown on the right side of FIG. 2, the cap-shaped device moves the central coke layer radially outward along the cap-shaped inclination so that coke does not accumulate, and secures a residence time. The peripheral coke layer, which tends to be delayed in descent, joins the flow of the central coke layer that bypasses the end of the cap shape to promote the descent. Although it is versatile, there is a limit as a method for making the coke descent of the entire straight body of the cooling chamber almost uniform because the coke movement is large in the radial direction in the cooling chamber.

Furthermore, the Kasagata device forms a spaceship-shaped (abacus-shaped) space with the coke resting surface directly below. This space reduces the volume of the cooling chamber by increasing the diameter of the cap-shaped device. On the contrary, if the diameter is reduced, the effect of equalizing the coke descent becomes smaller. With the Kasagata device, it is difficult to achieve both uniform coke descent and secure cooling chamber volume.

The present invention is based on such a background, and is equipped with a new cooling gas blowing device that overcomes the technical problems of the Kasagata device, and is capable of improving coke processing capacity and heat recovery capacity, and reducing equipment construction costs. Provide equipment.

The first object of the present invention is to remarkably equalize the coke descent in the straight body portion of the cooling chamber. The second is to minimize the volume of the device including the cooling gas path and increase the volume of the cooling chamber.

FIG. 3 shows two examples of funnel-shaped devices of the present invention. The shape is such that coke passes through the central opening of the device. The cooling gas supplied from the outside of the funnel portion via the support portion is blown from a ring-shaped cooling gas path including the outer peripheral surface of the device and the coke resting surface. The central coke layer is decelerated with a device and lowered from the central opening. The peripheral coke layer outside the outer diameter of the device is lowered between the outer circumference of the device and the inner surface of the cooling chamber and discharged along the funnel portion. It is desirable to minimize the coke movement in the radial direction of the chamber in the straight body of the cooling chamber by adjusting the amount of descent of the central coke layer and the peripheral coke layer. It is desirable to keep the coke discharge temperature lower and more stable.

As shown on the left side of FIG. 3, the cooling gas passes through the peripheral coke layer on the outer periphery of the device and the central coke layer on the inner side of the device, and rises while being dispersed by receiving the pressure resistance of the coke layer at the straight body of the cooling chamber.

FIG. 4 shows two examples of the reverse funnel type device of the present invention. In the device of the present invention, it is desirable to reduce the volume of the device including the cooling gas path within a range that does not affect the uniform coke descent. For example, if the cooling gas blowing is not affected, the cooling chamber volume can be increased by flattening the gas passage cross section by adjusting the inclination of the device to the coke angle of repose.

Alternatively, the device volume can be reduced by dividing the coke resting surface into a plurality of upper and lower stages by a louver as shown on the left of FIG. By passing coke through the center of the device, a ring-shaped cooling gas path can be formed along the periphery of the device.

In the present invention, in order to promote uniform coke descent in the straight body portion of the cooling chamber, it is desirable that 80% or more of the device volume including the cooling gas passage is contained in the funnel portion.

A part or the whole of the blowing device may have a stretched shell (monocoque) structure. The device or cooling gas path may be multiplexed or multi-staged vertically. An opening may also be provided in the support portion in order to secure or equalize the blowing amount. Patent No. 6518860 may be used in combination in order to make the cooling gas flow in the circumferential direction of the straight body more uniform.

According to the present invention, the coke descent of the straight body of the cooling chamber can be made much more uniform. Further, by flattening the shape of the cross section of the cooling gas path of the device, the volume of the cooling chamber can be expanded. The present invention makes it possible to secure a uniform coke residence time and increase the cooling chamber volume, which was difficult with a cap-shaped device. Therefore, the coke quality and energy recovery performance, which are the objectives of the coke dry fire extinguishing system, can be improved. Furthermore, the entire coke dry fire extinguishing system can be downsized.

This is an overview of coke dry fire extinguishing equipment. In the shade-shaped device, the left shows the cooling gas flow and the right shows the coke flow. In the two examples of the funnel-shaped device of the present invention, the cooling gas flow is shown on the left, and the descent velocity distribution at the upper and lower points of the straight body is shown on the right. The reverse funnel type device according to the present invention shows the louver type on the left and the simple type on the right.

A specific example to which the present invention is applied is shown. The present invention utilizes the properties of coke as a powder or granular material, and the properties of coke vary depending on the raw material and the carbonization condition. Therefore, it is desirable to optimize by model experiment, simulation, actual machine observation, etc. The present invention can be applied to both new and existing coke dry fire extinguishing equipment.

An example of a funnel-shaped device is shown in FIG. The central coke layer slows down by utilizing the internal friction generated in the device. It is desirable to adjust the amount of coke passing through the central opening so that coke does not stay in the device.

An example in which the device has a reverse funnel shape is shown in FIG. Cooling gas is blown from the resting surface of the central coke that has passed through the central opening. By passing a certain amount of coke through the central opening, it is possible to suppress the coke flow moving from the central coke layer to the periphery.

The present invention can be applied to an operation of uniformly lowering the powder or granular material filled in the container. It can be applied when discharging the packed layer of powder or granular material in which internal friction is generated.

1 Cooling chamber 2 Device 3 Funnel part 4 Sloping flue inlet 5 Support part 6 Prechamber 9 Cooling gas path 10 Cooling chamber straight body part

Claims (1)

The chamber of the refractory is filled with coke, and it has a red hot coke inlet at the top and a cooling coke outlet at the bottom. It is a structure that is transported,

The central coke layer is lowered from the central opening of the cooling gas blowing device, and the peripheral coke layer is characterized in that it is lowered between the outer periphery of the cooling gas blowing device and the inner surface of the cooling chamber, and the cooling gas is blown including the cooling gas path. It is a structure that accommodates 80% or more of the total device volume in the funnel part.

A coke dry fire extinguishing system that features this.

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