JPS5981382A - Coke oven having apparatus for drying charged coal - Google Patents

Abstract

PURPOSE:To provide the titled coke oven favorable economically and technically, with a smaller unit scale required without any exclusive dryer, by providing a carrier path for drying charged coal with a ventilating duct in bricks at the throat of the coke oven, and a coal charge vessel at the outlet. CONSTITUTION:Coal 20 is taken from a wet coal vessel 14 by a takeout conveyor 13 and fed through a chute 12 to a carrier path for drying charged coal 8. The coal 20 is agitated by the action of a flight 33 in a chain conveyor 34 during its transfer through the path 8 and dried by evaporating moisture; charged coal 20 can be dried sufficiently because the temp. of the path 8 is 500 deg.C or lower. Vapor generated from the path 8 is removed through a ventilating duct 11 out of the system to eliminate explosion or any other operating troubles. Dried coal 20 is fed into a dry coal vessel 16 by another bucket conveyor 15 and subjected to charging.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a coke oven having a coal drying device for drying and preheating charged coal.

The technical and economic advantages of charging coal into a coke oven after drying and preheating it have long been demonstrated. For example, the effects of preheating coal carbonization include, according to the 3rd edition of the Iron and Steel Handbook, Iron and Steel Manufacturing, an increase in coke oven production capacity by shortening the carbonization time, an increase in charging density, and softening and fusion of the coal during carbonization. It is believed that there are advantages such as improved coking ability by expanding the bed width, reduction in total heat required for carbonization by adopting an efficient drying preheater, and reduction in ammonium water treatment costs by reducing the amount of ammonium water generated. There is.

For this reason, various methods have been tested in the past, but for example, methods have been put into practical use that use a fluidized bed dryer or rotary dryer to dry the coal before charging it into a coke oven. ing.

However, these methods require a dedicated dryer to be installed independently, so of course they require a large installation space.
The capital investment is high due to the use of dust collectors to prevent dust generation during coal drying and dust generation in the dry coal transport line (transport route).Moreover, as a heat source for drying, for example, heavy oil, LNG, etc.
There are disadvantages in terms of economy and operability, such as the need for COG @ fuel.

For this reason, there is a strong hope for the emergence of a method for drying coal charged in a coke oven that is energy efficient, has good investment efficiency, is economical, and requires only a small space for equipment installation, and is excellent in both economic efficiency and operability.

In the present invention, the heat dissipated from the body of the coke oven (heat dissipation) is approximately 100,000 ka1 per coal, which is 15 to 20% of the total heat output.
This makes it possible to maintain the high temperature of the furnace top bricks, and to reduce the amount of CO generated in the carbonization chamber and flowing into the dry main.
Focusing on the phenomenon of maintaining the top brick of the furnace at a high temperature using the sensible heat of G (approximately 800℃), we developed a method to dry the charged coal using the radiation and dissipation (furnace heat) from this furnace body. This is what we provide.

That is, the present invention provides a coal drying method, which is characterized in that a coke oven furnace brick/tile is provided with a conveyance path for drying charged coal in which a steam vent pipe is attached, and a charging coal tank is provided at the outlet of the path. It is a coke oven with a device. Examples of its implementation are as follows.

A coke oven equipped with a coal drying apparatus according to claim 1, characterized in that the steam vent pipe is connected to a suction blower.

1. A coke oven having a coal drying apparatus as set forth in Items 1 and 2 of the scope of the patent Δn, characterized in that a steam venting device is connected to a suction main.

The conveyance path for drying the charged coal is a chain conveyor with flights, and the conveyor is connected to the surface of the furnace top brick.
A coke oven having a coal drying device according to claim 3, characterized in that the coal drying device is removably buried within a brick within 1.0 mm.

The present invention will be explained in detail below based on the drawings.

The top brick of a coke oven reaches a temperature of about 80 to 120 degrees Celsius due to heat transfer from the coking chamber, combustion chamber, etc., and it is well known that the temperature increases the further inside the top brick. There is. The present inventors measured the temperature distribution of the top brick of a coke oven (actual oven) during operation, and obtained the actual measurement results shown in FIG. 1.

The present inventors paid attention to the temperature distribution shown in FIG. 1, and in order to utilize this for drying charged coal, they manufactured a model furnace 1 shown in FIG. 2 and conducted basic research.

In FIG. 2, numerical values other than the symbols indicate the dimensions of the model furnace I.

This model furnace 1 is designed so that the temperature distribution of the furnace top brick can be made similar to that of an actual coke oven (actual furnace) used in operation. Furthermore, a chain conveyor is removably buried inside the furnace top brick 2 as a coal conveyance path 3, so that the coal can be conveyed back and forth through the path 3. In the figure, 4 indicates a coal supply port, 5 indicates a coal conveyance mechanism that penetrates the inside of a tube conveyor used as a coal conveyance path, and 6 indicates a combustion burner.

FIG. 3 shows the results of investigating the coal drying effect using the model furnace 1 shown in FIG. 2. This figure shows the results of an investigation at a surface temperature of 300° C. of the coal conveyance path 3 and a coal conveyance speed of v-12 m/min.

As a result, it can be seen that when coal (charged coal) containing 6 to 11% moisture is conveyed for 10 minutes on the coal conveyance path 3, about 6% of the moisture evaporates and dries.

Therefore, if the temperature of the furnace top brick due to furnace heat is 500℃ or less, and considering the operating conditions of the coke oven, it will be 300℃±5.
If the coal conveyance path 3 can be maintained at 0° C., not only the moisture content of the charged coal can be adjusted but also the charged coal can be preheated.

The present invention provides a coke oven having a charged coal drying device developed based on the above basic research, and examples thereof are shown in FIGS. 4 to 10.

Figure 4 is an explanatory diagram showing an example of utilizing an existing coke oven;
Figures 5 (a), (b), and 6 are enlarged explanatory views of the main parts of Figure 4, Figure 7 is an explanatory view showing the other actual male side of Figures 5 and 6, and Figure 8 Figure 9 is an explanatory diagram showing an example of an existing frozen or newly installed coke oven, Figure 9 is an explanatory diagram showing a steam venting system for the conveyance route for drying charged coal, and Figure 10 is a plan view of the Shinjitsu side of Figure 9. It is an explanatory diagram shown visually.

Figure 4 shows an example in which a coal drying device is installed in an existing coke oven that is in operation. 50 from the surface of coke oven top brick 7
A chain conveyor having a flight 33 shown in Fig. 5 (a) and 2 (b) as a conveyance path 8 for drying the charged coal within 0 mm inside = 34 is meandering when viewed from the plane of the top of the coke oven and can be removed at will. Bury it.

An example of this buried state is shown in an enlarged view in FIG. 6, with inspection port 9, coal loading port 10. The coal will be buried in a detour so as not to interfere with the rails of coal loading cars.

The conveyance path 8 for drying charged coal is provided with steam vent pipes 11 for appropriate lengths of the entire length thereof. The pipe 11 is equipped with an automatic control valve (not shown) to satisfy the steam venting function. One end of the conveyance path 8 for drying the charged coal is connected to the chute 12, the cutting conveyor 13, and the wet coal tank 14 of the coal tower. The other end of the conveyance path 8 for drying charged coal is connected to a packet conveyor 15 and a dry coal tank 16. The coal conveyance speed tty y7 of the charged coal drying conveyance path 8 can be controlled by operating a drive device for a tube conveyor (not shown). ...In the figure, 17 is a retaining wall, 18 is a carbonization chamber, 19 is a combustion chamber, 20 is coal (charged coal), and 21 is a compressed air supply device, which is attached to and detached from the outlet of the channel 8 for drying the charged coal. It is set up freely.

Since the embodiment shown in FIG. 4 has the above-described configuration, the coal 20 is cut out from the wet coal tank 14 by the cutting conveyor 13 and guided to the conveyance path 8 for drying the charged coal through the chute 12. As a result, the coal 20 is conveyed through the path 8 and is agitated by the action of the flights 33 of the chain conveyor 34, so that the coal 20 having a large surface area is dried by evaporating moisture.

It can be seen from FIG. 1 that the temperature and change of the path 8 is 500
Since the temperature is below .degree. C., the charged coal 20 can be sufficiently dried as explained in FIGS. 2 and 3.

Note that the charging coal 20 can be preheated or the humidity can be adjusted by adjusting the time required for coal conveyance, the amount of coal conveyed, etc., depending on the purpose.

Further, FIG. 7 shows an example in which coal can be stirred at a transfer point on the coal conveyance path 8. In this case, for example, conveyance path 8 → chute 35 → conveyor 36 → supply chute 37 → multiplication of conveyance path 8! Since the coal is stirred with an interaction of 111g, there is an advantage that the stirring M is increased.

Now, the steam generated in the conveyance path 8 for drying the charged coal is removed to the outside of the yarn through the steam vent pipe 11, thereby solving explosions and other operational troubles.

The dried charged coal 20 is transferred to another gasket type conveyor 1.
5' to a dry coal tank 16 for charging.

Since the compressed air supply device 21il-11 is removably installed at the inlet and/or outlet of the charged coal conveyance path 8,
By supplying compressed air to the charged coal conveying path 8, the inside of the conveying pipe can be cooled to a predetermined temperature during cleaning and when the conveying device is stopped in an emergency. As a result, the route 8 satisfies the condition that it does not interfere with the operation.

FIG. 8 shows another embodiment of FIG. 4, which is applied to an existing or newly installed coke oven, for example.

A chain conveyor as a conveyance path 8 for drying the charged coal equipped with a steam vent pipe 11 is installed at a distance of 50 mm from the surface of the furnace top brick 2.
It can be removably buried at a depth within 0wnJJ. At the entrance of the conveyor 8, a coal supply device 23 (for example, a supply holler 9-) connected to the belt conveyor 22 is provided. At the outlet of the amada charged coal drying path 8, a charged coal type (for example, stored coal hora/thousand) 24 is provided. However, the illustrated one shows a state in which a gasket type conveyor 25 is connected to the outlet of the route 8 and a coal storage container 24 is provided.

That hora/? - 24 is connected to the charging car 27 below the cutting opening 26 . The charging coal drying path 8 is buried in a manner similar to that shown in FIG. 4 so as not to interfere with other coke oven configurations. In this case, route 8 may be selected from among those in FIGS. 5(a) to 8.

Since the embodiment shown in FIG. 8 is constructed as described above, the fourth embodiment
It has the following advantages compared to the example shown in the figure.

The coal supply device 23 and charging coal tank 24 are separated, the conveyance path 8 is simple and the equipment cost is low;
Since the charged coal conveyance path 8 can be taken out of the system of the coke 714 bodies from the retaining wall 17, there are advantages such as the above-mentioned two compressed air supply devices and the coal stirring system shown in FIG. 8 can be easily installed and utilized.

9 and 10 show the steam vent pipe 11 of the conveyance path 8 for drying charged coal and its thread, which are selected and adopted as appropriate in FIGS. 4 to 8. In the figure, 21 indicates a compressed air supply device.

In FIG. 9, the steam vent pipe 11 of the charged coal drying path 8 is connected to a suction blower 29 via a suction pipe 28. 30
is an automatic control valve, and the steam vent pipe 11 is installed at necessary locations for operation.
It plays the role of opening and closing and adjusting the amount of steam suction. Therefore, the steam generated in the conveyance path 8 for drying the charged coal is sucked in by operating the suction blower 29 and the automatic control valve 30, and satisfies the operating conditions for drying the charged coal.

FIG. 10 shows a coke oven top brick 7 in another embodiment of FIG.
It is shown as seen from the plane. The difference with Figure 9 is
The suction pipe 28 is connected to a suction main 32 which is connected to a dry main 31. Therefore, the suction main 32 is -30mm Aq (30+n+n H
2O), the action of this draws steam through the charge coal drying path 8, and satisfies the operating conditions of the charge coal drying tank. In order to ensure operational safety, a suction blower 29 is provided in the suction pipe 28, so that the blower 29 can also be used to force suction.

Since the present invention 1 is constructed and operates as described above, it has the technical and economical advantages of drying (preheating) charging coal, which is already known, such as the previously mentioned effects during carbonization. Demonstrate. Also, unlike the conventional charging coal drying (preheating),
Since it is carried out by utilizing the dissipated heat (furnace heat) of the coke oven, it is extremely economical and has an energy-saving effect. Furthermore, since it does not require a dedicated dryer (preheater) like the conventional one, the scale of the equipment is small and the equipment cost can be reduced. Therefore, the present invention has economically and technically advantageous effects not found elsewhere.

[Brief explanation of drawings]

Figure 1 is a graph showing the temperature distribution of the coke oven bricks, Figure 2 is an explanatory diagram of the coke model oven used in the basic research of the present invention, and Figure 3 is the result of the test using Figure 2. A graph showing the coal drying state; Fig. 4d is an explanatory diagram showing an embodiment of the coke oven of the present invention; Figs. 7 is an explanatory diagram showing another embodiment of FIG. 6, FIG. 8 is an explanatory diagram showing another embodiment of FIG. 4, and FIG. 9 is an explanatory diagram showing another embodiment of FIG. 4.
FIG. 10 is an explanatory diagram showing the steam venting system of the conveyance route for drying charged coal used in the figure, and FIG. 10 is an explanatory diagram showing another embodiment of FIG. 9 viewed from above. 1: Model furnace, 2: Furnace top brick, 3: Coal conveyance path, 4: Coal supply port, 5: Coal conveyance mechanism,
6: Combustion burner, 7: Coke oven top brick, 8: Transport path for drying charged coal, 9: Inspection port, 10: Coal charging port, ] 1: Steam vent pipe, 12: Chute, 13: Cutting conveyor, 14 : Wet coal tank of coal tower, 15, 15' : Packet type conveyor, 16: Dry coal tank, 17: Retaining wall, 18: Carbonization chamber,
19: Combustion chamber, 20: Coal (charged coal), 21: 1 compressed air supply device 22: Pelt conveyor, 23: Coal supply device, 24 2 charging coal tanks, 25: Packet type conveyor, 26: Cutting port , 27: Charging vehicle, 28: Suction pipe, 29: Suction blower-130: Automatic control valve,
31: Dry main, 32: Suction main, 33: Flight, 34: Chain conveyor X1
35: Chute, 36: Conveyor, -137:
supply chute. Fig. 1 Fig. 2 Nonoheli Dadde, Fig. 3, 5 [□ ゛ [Sharing F3! Between f (intermediate) Figure 5 (a) (b)

Claims (1)

[Scope of Claims] 1. A steam vent pipe is attached to the top brick of a coke oven, a conveyance path for drying the charged coal is provided, a coal supply device is provided at the entrance of the path, and a conveyance path for drying the charged coal is provided at the outlet of the path. A coke oven equipped with a coal drying device, characterized in that it is equipped with a tank. 2. A coke oven having a coal drying apparatus according to claim 1, characterized in that a steam vent T is connected to a suction blower. 3. Claim 1, characterized in that the steam vent pipe is connected to the suction main. A coke oven comprising the coal drying device according to item 2. 4. The conveyance path for drying the charged coal is a chain conveyor with flights, and the conveyor is placed 50 mm from the surface of the furnace top brick.
A coke oven having a coal drying device according to claim 1, characterized in that the coal drying device is removably buried within a brick within 100 m². 5. Paragraphs 1 and 2 of the patent claim, characterized in that a compressed air supply device is detachably provided at the entrance of the conveyance path for drying charged coal and/or at the outlet of the shredder. A coke oven comprising the coal drying device according to items 3 and 4.