JPH0129239B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for drying and heating up coke dry extinguishing equipment, which is carried out for the first time after construction of a furnace, and particularly relates to a method for drying and heating up coke dry extinguishing equipment, which is carried out for the first time after construction of a furnace. The heat insulating layer, which was charged to prevent combustion, is made into bulk material that is processed in the blast furnace, unlike conventional ones.This ensures ventilation and allows the material to be placed directly into the blast furnace without being removed after cutting. The present invention relates to a method for increasing the drying temperature at the initial stage of operation of coke dry extinguishing equipment, which improves workability by allowing injection of coke.

In red-hot coke dry fire extinguishing towers, the refractory insulation inside the tower is damp when the tower is constructed, so it is necessary to dry it and raise the temperature in the early stages of operation. To briefly explain this based on FIG. 1, before drying starts, a cold coke layer 3 is placed to cover the steel cooling gas blowing part 2 provided at the bottom of the fire extinguishing tower 1 in order to protect it from high temperatures. is formed in advance. Next, a drying burner 4 is installed in the tower, and while the air and fuel gas blown in from the drying burner 4 are combusted, the combustion gas is exhausted from the annular flue 5 to dry the bricks in the tower. After the temperature has been raised by the burner 4, red hot coke is charged from the charging port 6 and the temperature is continued to rise using this heat.

By the way, there is a possibility that the cold coke 3 will burn during drying and heating, and it is necessary to prevent this. Therefore, conventionally, heat-resistant bricks were laid on the upper surface of the cold coke 3 to form a heat insulating layer 7.

However, although combustion of the cold coke 3 can be prevented by laying heat-resistant bricks, the following problems occur.

(1) When blowing cooling gas into the tower from the cooling gas blowing section 2 through the cooling gas conduit 8 in order to cool the charged red-hot coke, the air permeability of the heat insulating layer 7 made of the heat-resistant bricks is poor and it remains as it is. Therefore, the required amount of gas cannot be delivered. Therefore, in order to form a fault that will serve as a gas passage in the heat-resistant brick layer,
This requires the troublesome work of cutting out portions of the cold coke 3 from the bottom of the tower in different amounts in the circumferential direction.

(2) Heat-resistant bricks 7 are mixed into the coke cut from the bottom of the tower, but if they are charged into the blast furnace together with the coke, it will cause operational problems because they are refractory. Therefore, the complicated work of sorting out the mixed heat-resistant bricks 7 from the cut coke was required.

The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to form a layer of heat-resistant bulk material on top of cold coke, thereby making it different from the conventional heat-resistant brick layer. By obtaining the same insulation effect and ensuring sufficient air permeability as is, and by using this bulk material as a raw material to be processed in the blast furnace, it can be directly fed into the blast furnace with coke without having to be removed after cutting. Thus, it is an object of the present invention to provide a drying temperature raising method in the initial stage of operation of coke dry extinguishing equipment, which can significantly improve workability.

According to the present invention, the above object is achieved as follows. That is, a cold coke layer is filled and formed so as to cover a cooling gas blowing section made of steel that is installed at the bottom of a fire extinguishing tower and blows cooling gas in countercurrent to the red-hot coke flowing down inside the tower. Protects the cooling gas blowing section from the high heat caused by the drying temperature increase that will occur in the future. Next, a heat insulating layer made of processed raw materials such as sintered ore and iron ore, which are introduced into the blast furnace and processed together, is formed on the cold coke layer to ensure fire resistance and air permeability. Then, the upper part of the heat insulating layer is dried and heated using a burner, and then, since breathability has already been ensured, the red hot coke is directly introduced into the tower from the cooling gas blowing section through the cold coke layer and the heat insulating layer. Inject cooling gas. Finally, the cold coke layer and the heat insulating layer are cut out of the tower so that they can be introduced into the blast furnace as they are without being separated later, since the heat insulating layer is the raw material to be processed in the blast furnace, thereby improving work efficiency. It was designed to be obtained.

A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 2 is a schematic explanatory diagram showing an example of coke dry extinguishing equipment for explaining the method of the present invention.
As shown in the figure, 10 is a cooling tower having a charging port 11 at the top and a cooling gas blowing part 12 at the bottom, 13 is a dust remover, 14 is a boiler, and 15 is a circulation fan, which supplies circulating gas to the cooling tower 10. Introduced into charging port 11
A circulating gas passage is configured to cool the red-hot coke that has been charged and flow down, and to guide the circulating gas heated by the cooling to the boiler 14 for heat recovery.

Further, a diffusion pipe 16 is provided at a position on the gas inlet side of the cooling tower 10 in the circulating gas flow path. In the figure, 17 is a drying burner for drying the refractory insulation bricks in the cooling tower 10 by burning air and fuel gas, and 18 is a drying burner provided on the gas inlet side to the cooling tower 10 to control the flow rate of circulating gas or a diffusion pipe. 16 is shown.

In the above configuration, before drying and raising the temperature of the fire extinguishing tower 10, a cold coke layer 19 made of cold coke is filled and formed in advance to cover the steel cooling gas blowing section 12 provided at the bottom of the tower. A heat insulating layer 20 made of a processing raw material such as sinter or iron ore is laid on top of the cold coke layer 19 to prevent the cold coke layer 19 from being directly exposed to high temperatures.

Next, the drying temperature raising method of this fire extinguishing equipment will be explained.

After the coke dry fire extinguishing tower 10 is constructed, it is necessary to dry and heat the fireproof insulating bricks inside the tower 10 to remove moisture. This drying temperature increase is carried out in three stages at the beginning of operation in conjunction with the original red-hot coke cooling operation.

The first stage of drying and heating up the coke dry fire extinguishing equipment involves a temporary chimney 2
At the same time, the damper 18 provided on the lower gas inlet side is closed to prevent circulating gas from flowing into the fire extinguishing tower 10. Then, a drying burner 17 is installed inside the fire extinguishing tower 10, and the air and fuel gas sent therefrom are combusted, and the combustion gas is sucked by the blower 18 and exhausted to the atmosphere from the diffusion pipe 16. Before the start of drying, in order to protect the steel gas injection part 12 from the combustion heat of the burner 17 and the high heat of the red hot coke charged later, a layer of cold coke made of cold coke is placed at the bottom of the fire extinguishing tower 10. 19 is filled and formed to cover the gas injection part 12, but if this continues, there is a risk that the cold coke layer 19 will burn during the temperature rise. Therefore, in the present invention, a heat insulating layer 20 is formed on top of the cold coke layer 19 using bulk material made of blast furnace processed raw materials such as sinter or iron ore to protect the cold coke layer 19. Since sintered ore and iron ore are heat resistant, there is no danger of combustion, and if they are charged in layers, they have a heat insulating effect and can also prevent the cold coke layer 19 from burning.

As the second stage of drying temperature increase, the drying burner 17 is removed and the manhole 2 is opened as shown in Fig. 3.
2 (see FIG. 2) is closed, red-hot coke 23 is introduced from the charging port 11, and the temperature continues to rise using this heat.
At this stage, the damper 18 is opened to open the circulation gas flow path, and cooling gas is blown from the cooling gas blowing section 12 through the cold coke layer 19 and the heat insulating layer 20, countercurrently to the red hot coke 23, and exchanging heat therewith. At this time, a heat insulating layer 2 of sintered ore or iron ore
Since the material 0 is made of loose material, it is breathable and does not interfere with the flow of the cooling gas.

In the final stage of drying and heating, the coke 19 is gradually cut out from the bottom of the column 10, while red-hot coke 23 is charged from the charging port 11 at the top.
In this process, sinter or iron ore is converted into coke 19
However, since sintered ore and iron ore are raw materials for blast furnaces, there will be no problem in blast furnace operation even if they are charged together with coke into a blast furnace (not shown). Incidentally, in a 100 t/h class coke dry fire extinguishing system, the amount of cold coke 19 is approximately 100 ^m3 , and the heat insulating layer 2 of the sintered ore or iron ore used is
Since 0 is 15 to 20 m ³ , even if coke 19 is mixed with sintered ore or iron ore, the proportion thereof is small and does not cause any problem in blast furnace operation.

Therefore, a heat insulating layer 20 made of sintered ore, iron ore, etc. is formed on the top of the cold coke layer 19. Since this heat insulating layer 20 is a bulk material, it can be formed into a layer by simply charging it uniformly into the tower 10. Since it is formed and laid on the upper surface of the cold coke layer 19, it is not necessary to lay the heat-resistant bricks 7 regularly as in the conventional example, and the work of forming the heat insulating layer 20 can be made extremely easy and in a short time. In addition, since the heat insulating layer 20 is made of loose materials, it has countless gaps even when formed in layers, ensuring sufficient air permeability as it is. The secondary work of cutting out a portion of the coke can be omitted, and the required amount of gas can be sent.
Furthermore, since the heat insulating layer 20 uses sintered ore or iron ore itself, which is a processing raw material for a blast furnace and does not pose any problem even if it is charged into a blast furnace and processed, it can be fed into the blast furnace with it mixed in. Therefore, the most complicated work of removing the heat-insulating layer material (heat-resistant brick) from the coke, which is conventional, can be omitted.

In summary, the method of increasing the drying temperature at the initial stage of operation of coke dry extinguishing equipment according to the present invention exhibits the following excellent effects.

(1) A heat insulating layer made of processed raw materials such as sintered ore and iron ore is formed on top of the cold coke, ensuring fire resistance and air permeability, and is filled to protect the gas injection equipment from high temperatures. In addition to preventing the formed cold coke layer from burning during drying and heating, when charging red hot coke and blowing cooling gas into the tower after heating by the drying burner is completed,
As it is, gas will circulate sufficiently and ventilation will not be hindered. Therefore, the work required to ensure air permeability, which was conventionally required, is no longer necessary.

(2) Sinter or iron ore is mixed into the cut coke, but since these raw materials are raw materials for blast furnaces, they can be charged into the blast furnace together with coke. Therefore, the conventionally indispensable and most troublesome task of sorting out coke can be omitted, and the initial operation time can be significantly shortened. Therefore, smooth drying temperature rise is possible, and accordingly, inexpensive blast furnace coke can be supplied.

(3) In this way, the entire operation process for drying and heating up the fire extinguishing equipment can be simplified, and drying and heating can be done smoothly.

[Brief explanation of drawings]

Fig. 1 is a schematic cross-sectional view of a fire extinguishing tower explaining the conventional drying and heating method, Figs. 2 and 3 are schematic system diagrams of fire extinguishing equipment implementing the present invention, and Fig. FIG. 3 is an explanatory diagram showing the drying temperature increase by red-hot coke. In addition, in the figure, 10 is a coke dry fire extinguishing tower, 12 is a cooling gas blowing part, 17 is a burner, 19 is a cold coke layer, 20 is a heat insulation layer, and 23 is red hot coke.

Claims (1)

[Claims] 1. A cold coke layer is formed so as to cover the cooling gas blowing section which is provided at the bottom of the coke dry fire extinguishing tower and blows cooling gas countercurrently into the red hot coke flowing down inside the tower. On top of this, a heat insulating layer made of processing raw materials such as sintered ore, iron ore, etc., which are put into a blast furnace and processed is formed, and the upper part of the heat insulating layer is dried and heated using a burner,
A coke characterized in that the cold coke layer and the insulation layer are cut out of the tower while blowing cooling gas into the red hot coke that is then introduced into the tower through the cooling gas blowing section through the cold coke layer and the insulation layer. Dry heating method at the initial stage of operation of dry fire extinguishing equipment.