JPH02145686A - Removing of carbon and operation in coke furnace - Google Patents

Abstract

PURPOSE:To operate removing of carbon in carbonizing chamber in extremely short time and thus improve operation rate of coke furnace by blowing air using furnace cover for burning of carbon and burning carbon attached on wall face in carbonizing chamber. CONSTITUTION:A hood 12 of riser tube or a cover 6 of carbon inserting port near to riser tube 2 in an empty furnace finished extrusion of coke from carbonizing chamber 1 of coke furnace is opened and one of the cover is released, then a cover 7 for burning of carbon having a receiving hole 76 of air and a squirt hole 75 is fitted on the hole of furnace. Then, air is blown into said carbonizing chamber 1 through an air tube 74 of air compressing device 8 of same type as loaded in streetcar, etc., thus attached carbon 22 is burnt and removed. Besides, effective burning of carbon in whole region of carbonizing chamber is possible by adjusting blowing quantity of air or hot air according to attaching state of attache carbon.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a method for burning off carbon adhering to the wall surface of a coke oven carbonization chamber and a method for operating a coke oven.

BACKGROUND OF THE INVENTION In the production of coke, carbon adheres to the wall surface of a coke oven carbonization chamber due to the decomposition of hydrocarbons.

This deposited carbon increases the extrusion resistance and causes damage to the furnace wall and clogging. In addition, carbon adhering to the ceiling and riser pipes becomes an impediment to leveling and the passage of generated gas.

On the other hand, the volatile content of raw coal for coke tends to be used at a higher carbonization temperature in order to reduce costs.

Therefore, the generation of carbon increases, and the extension of the life of the coke oven cannot be considered by imitating the carbon problem, and periodic removal work is required.

The conventional method for removing carbon attached to the carbonization chamber is as follows:
The carbonization chamber is made into an empty kiln for one cycle, the riser pipe canopy and the charging port on the opposite side of the riser pipe are opened, and air is introduced from the open coal charging port on the opposite side of the riser pipe due to the draft effect of the riser pipe. The attached carbon is then burned off. However, this method leaves the carbonization chamber empty for a long time,
Not only does the amount of heat of carbonization increase, but production also decreases during this period, and the coal charging port where air is introduced is cooled, causing damage due to spalling and the like. It is said that having a cavity for a long time is undesirable from the viewpoint of extending the life of the furnace body, because the expansion and contraction of the coking chamber wall bricks is greater than the periodic fluctuations of normal operation.

Another method, as described in Japanese Patent Publication No. 60-2348, is to use a spear-shaped jig with a sharp tip and manually push the coal out of the charging port on the furnace. but,
In this method, the carbon layer completely peels off from the wall surface, the sealing function of the carbon at the furnace wall joints is impaired, and black smoke is generated from the chimney due to gas leakage from the carbonization chamber to the combustion chamber.

In addition, this work requires high-temperature, heavy-duty labor, and the carbon that adheres to the ceiling of the carbonization chamber and the upper part of the wall between the coal loading ports is
Since there is a blind spot from above the furnace, it is difficult to push it down.

In addition, there is a method in which the injection conditions of the injection nozzle inserted near the corresponding part are set according to the thickness of the adhering carbon layer on the wall surface of the coke oven carbonization chamber, and the combustion removal is carried out according to the amount of adhering carbon (JP-A-Sho). 61231084) has been proposed.

However, this method is difficult to measure the thickness of the deposited carbon layer in the carbonization chamber.
Not only is the operation complicated, such as setting the injection conditions of the injection nozzle, but the equipment cost is also high.

Also, JP-A-62-. The removal method described in the 1883 publication is a method of injecting a gas pressure source containing oxygen into the coke oven carbonization chamber at high speed using a lance and an injection nozzle. However, this method has the disadvantage that it is difficult to control combustion throughout the carbonization chamber, and that it is difficult to carry out during normal unloading from the kiln. Generally speaking, combustion using an injection nozzle will damage the furnace wall if it is sprayed at a short distance from the furnace wall, so it is necessary to install the injection nozzle parallel to the wall surface of the carbonization chamber for injection. Therefore, in this method, the wall surface near the nozzle installation becomes a combustion blind spot.

In addition, JP-A No. 62-161883 discloses a combustion removal method in which a lance with an injection nozzle is inserted from the top and side surfaces of the carbonization chamber so that the injection direction in the carbonization chamber is parallel to the wall surface. The equipment is described. However, this method also has the same drawbacks as in the case of JP-A-62-1883.

Problems to be Solved by the Invention The conventional method of carbon combustion in a carbonization chamber using natural ventilation in the cavity is as follows:
As described above, the carbonization is carried out by leaving the carbonization chamber empty, opening the riser pipe, and partially opening the charging lid. However, this natural ventilation has a limit to the amount of combustion air, and in order to completely burn the carbon, it is necessary to leave the carbonization chamber empty for a long time. As a result, the operating rate of the furnace decreases, and local combustion control is not possible.
This causes local cooling of the furnace wall, which has an adverse effect on the furnace bricks.

Various problems have also been encountered in the various carbon combustion removal methods or devices that have been proposed to eliminate the drawbacks of natural ventilation.

This invention aims to solve these problems.
The present invention provides a method for removing carbon adhering to a coke oven and a method for operating it, which can completely burn and remove carbon adhering to the wall surface of a coke oven.

Means for Solving the Problems In order to achieve the above object, the method for removing deposited carbon in a coke oven of the present invention provides a method for removing adhered carbon from a coke oven, in which the coke oven is removed from a coke oven in the vicinity of the large lid of the riser pipe or the riser pipe in which coke has been extruded from the coke oven carbonization chamber. After opening the cover of the coal charging port, remove one side of the furnace lid, attach a carbon combustion furnace lid with an air inlet and an air outlet to the kiln mouth, and connect the air pipe of the air pressure feeding device mounted on a train etc. The purpose is to blow air or the like into the carbonization chamber through the carbonization chamber to burn the deposited carbon.

The carbon combustion furnace cover used includes a plurality of carbon combustion air outlets arranged in the vertical direction.

In addition, during coke oven operation, while coke is being extruded from the relevant oven according to the work schedule,
The purpose is to sequentially repeat the carbon removal operation of blowing air or the like into each kiln from which the coke extrusion has been completed and which burns off the adhering carbon.

In this case, the carbon removal work is performed using a carbon combustion furnace lid in which a plurality of carbon combustion air outlets are vertically arranged.

Function: When blowing air, etc. using the carbon combustion furnace cover according to the present invention, the air inlets corresponding to areas with a large amount of carbon adhesion produce more air, and the air inlets corresponding to areas with less adhering carbon inject more air. Since the amount of carbon is controlled to be reduced, carbon combustion is effectively carried out in the entire area of the carbonization chamber, and carbon can be completely removed through short-time combustion.

Therefore, in the operation of a coke oven according to the work schedule, during a short period of time when coke is being extruded in the relevant kiln, the carbon removal work to burn off the adhering carbon in the previous kiln is synchronized with the coke extrusion work. You can do it by doing this.

EXAMPLES Example 1 An example of the method for removing carbon deposited in a coke oven according to the present invention will be described with reference to FIGS. 1 to 4.

Figure 1 shows a guide wheel (5
) side furnace lid is removed, a carbon removal furnace lid (7) is attached in its place, and the air pressure feeding device (8) mounted on the coke guide car (5) is connected to the carbon removal furnace N (7). FIG. In the figure, (4) is a heat storage chamber, (9) is an inlet, (10) is a hood, (20) is a movable dust collection duct, and (21) is a fixed dust collection duct.

The coke oven is not in operation, and the current long-time empty oven is shortened (to reduce production and reduce the amount before carbonization) to create a carbonization chamber (1).
When burning the adhering carbon (22), firstly, in order to discharge the combustion gas after the carbon has been burned, the top fi (12) of the riser pipe (2) or the coal charging port near the riser pipe is used in an empty kiln. Release M(6). Next, the extruder side furnace lid (
3) Or, remove one of the coke guide car side furnace lids (coke guide car side furnace M in the figure) and replace it with, for example, the carbon combustion furnace lid (7) temporarily placed on the stand (16) in Figure 5. Attach. At this time, the replacement of the furnace lid is done using a furnace lid removal machine installed on the train.

As shown in Fig. 2, the carbon combustion furnace cover (7) is made of a steel frame (71) fitted with a refractory (72) and knife-etched to block outside air like a normal PM. (7
3). The refractory (72) is equipped with an air pipe (
74) and multiple outlets (
75) and one receiving port (76) on the steel frame side.
will be established. A damper (77) is provided opposite to each outlet (75), and as shown in FIG. 2C, the damper (77)
The opening area of the air outlet (75) can be changed by moving the air outlet (75) forward or backward to adjust the amount of air blown out. In addition, damper (77)
is adjusted by means such as manually operated by a screw mechanism or automatically operated by a cylinder. Note that (78) in the figure is a bolt for installation.

The air pressure feeding device (8) consists of a feeding & HJt equipped with a connecting device (81) at the tip. An example of this connecting device (81) is shown in FIG. At the tip of the air pipe (82) connected to the ventilation hall, a movable duct (83) whose rear part is sealed with bellows (84) is movably moved via rollers, etc., and is moved forward and backward by a hydraulic cylinder (85). Configure.

And the receiving port (76) of the carbon combustion furnace M (7)
Place the air pressure feeding device (8) at a position where the moving duct (83) and ) and the moving duct (83) are airtightly connected (Fig. 3b).

After the air pressure feeding device (8) is connected as described above, the blower is moved to blow air, etc. into the carbonization chamber from each outlet (75) to burn the attached carbon (22).

At this time, the condition of the adhered carbon is determined by visual inspection, mechanical or electrical detection method, and based on this, the damper (
77) to adjust the amount of air blown from each outlet (75) to match the amount of deposited carbon. therefore,
Complete combustion of carbon is possible by localized blowing of air or the like.

Example 2 A case in which the carbon combustion removal method according to the present invention is carried out during coke oven operation performed according to a predetermined kiln discharge schedule will be described with reference to FIGS. 5 and 6.

FIG. 6 shows a time schedule for coke oven operation according to the present invention. This operating method is such that the charging of coal into the previous extrusion kiln is started only when extrusion in the current extrusion kiln is completed, and while the current extrusion kiln is extruding, the coal loading car is running to receive the coal, and the previous extrusion is completed. The kiln is empty. During this coal receiving run, the empty kiln remains for about 6 minutes. Using this empty kiln time, the guide wheel is used to burn off the carbon deposited in the previous extrusion kiln.

In other words, compared to the current extrusion kiln, the guide wheel removes the furnace lid.
While the shutter (guide shield) is set and coke is being extruded by the extruder, the same guide wheel is used to replace the carbon combustion furnace lid and blow air or hot air into the extrusion kiln. This is done to burn off the adhering carbon. The blowing of hot air is carried out for about 2 minutes during extrusion, which is indicated by hatched blowing in the figure, and the blowing of air is carried out before that time.

As mentioned above, the extrusion work in the extrusion kiln and the combustion removal of adhering carbon in the kiln that has already been extruded are performed simultaneously according to the time schedule, and the details of the operation during this time will be explained based on FIG. 5.

The diagram shows kiln number 2. This figure shows the work order when the work schedule is set so that the kiln unloading work is performed in the order of 7.12.17...

In this case, the coke guide car (5) is equipped with a furnace lid detacher (14).
) and the shutter (15) are mounted at a distance of five kilns, and a hot air blowing device (30) equipped with a carbon combustion furnace M (7) is mounted. This hot air blowing device (3
0) attaches the carbon combustion furnace M (7) to the support cart (32) placed on the rail (31), so that the carbon combustion furnace lid (7) fits into the kiln opening when the cart moves forward. , the reception port (76) of the furnace lid and the air blower U,! t (33) is connected with a flexible air pipe (34). And the blower (3
3) The suction port is connected to the coke guide wheel (
5) to the suction port (9) provided on the dust collection hood (10).

Therefore, in this case, the connecting device shown in FIG. 3 is not necessary, and as shown in FIG. The hot air of over 100°C generated in the process is blown into the carbonization chamber as carbon combustion air (time indicated by hatched blowing in Figure 6). Air is blown during the spraying period before that.

Now, the case where the work starts from extrusion in the second kiln will be explained with reference to FIG. 5a. After stopping the coke guide wheel (5) by aligning the center of the furnace lid removal 14) with the center of the No. 2 kiln, remove the furnace lid (13) of the No. 2 kiln. The removed furnace cover (13) is placed on a storage stand (16) installed outside the furnace, so the coke guide car (5) is moved. Then, after placing the furnace lid (13) on the holding stand (16), the coke guide car (5) travels to the furnace side, sets the shutter (15) in the second kiln, and completes extrusion. After the extrusion of the No. 2 kiln is completed, the coke guide wheel (5) stops when the furnace cover is attached and removed [4] in line with the No. 7 kiln that will be extruded next time. At this time, it faces the second lid of the hot air blowing device (30) from which the carbon combustion furnace lid (furnace H13 from which extrusion was completed last time) was removed. Here, for the No. 7 kiln, after removing the furnace ff1 (18) and installing the shutter (15), extrusion work is performed using an extruder. While extrusion is being carried out in the No. 7 kiln, the lid (12) of the riser pipe of the empty No. 2 kiln or the coal charging port M (
6) and the support stand (30) of the hot air blowing device (30)
32) and attach the carbon combustion furnace lid (7).
The blower (33) is started and air is blown from the dust collection hood (10) at first, and hot air is blown during extrusion to burn off the adhered carbon. At this time, the adhesion state of the adhered carbon (22) is detected by means such as visual inspection, and based on this data, the amount of air blown out from each outlet (75) of the carbon combustion furnace M (7) is adjusted. It can be removed sufficiently by a combustion time of about 6 minutes, which is the same as the extrusion time.

As described above, when the extrusion in the No. 7 kiln and the carbon combustion in the No. 2 kiln are completed, the coke guide wheel (5) moves and moves the furnace M (18) to face the No. 2 kiln as shown in Fig. 5G. Then, operate the furnace lid removal machine (14) to install the furnace lid and finish premature coal loading.

The above operation is repeated, but when the carbon combustion has finished for the final n-th kiln, there is no furnace lid in the furnace lid detacher (14). Therefore, when the Konik guide car (5) stops at a position where the carbon combustion furnace cover (7) faces the final window as shown in Fig. 4d, it faces the furnace M desorption machine (14) on the car. A stand (17) is set up at the position, and the furnace cover removal machine (14) grabs the spare furnace 1 (19) placed there.
A coke guide car (
5) Move and attach the furnace lid. Also, the deposit is on the stand (17)
It is also possible to move the coke guide car (5) to the above-mentioned stand (16) and use its furnace cover (13) without installing a coke guide wheel (5).

Incidentally, in the above embodiment, the case was explained in which one of the furnace cover removal machines (14) mounted on the current guide car was used. If one more furnace lid removal/removal machine is added near the cart (32), extrusion and carbon combustion can be performed at a fixed position without the guide car having to travel extra.

Effects of the Invention This invention attaches a carbon combustion furnace lid having a plurality of outlets in the height direction to the kiln mouth in an empty state, and blows air or hot air in accordance with the state of adhering carbon to burn and remove the carbon. Therefore, effective carbon combustion is possible throughout the entire carbonization chamber, and by adjusting the blowout from each outlet, it is possible to ideally diffuse air and hot air within the carbonization chamber and concentrate it in areas with excess carbon. By targeted injection, carbon can be completely removed through short-term combustion. Therefore, the process can be carried out not only in an empty kiln but also in a kiln that has finished extrusion during operation according to the work schedule, without changing the work schedule.

Therefore, the carbon removal work in the carbonization chamber can be carried out in a significantly shorter time than in the conventional method, and the coke operation rate can be improved.

[Brief Description of the Drawings] Fig. 1 is an explanatory diagram showing a state in which a carbon removal furnace cover is attached to a coke oven carbonization chamber in order to implement the present invention, and Fig. 2 is an explanatory diagram showing a state in which a carbon removal furnace cover is installed in a coke oven carbonization chamber to implement the present invention. Figure 3 shows the connection device of the air pressure feeding device; Fig. 4 is an explanatory drawing showing the hood part of the coke guide car equipped with a hot air blowing port; Fig. 5 a- d is an explanatory diagram partially illustrating the operation according to the time schedule when performing carbon combustion removal during coke oven operation, and Fig. 6 is an explanatory diagram partially illustrating the operation according to the time schedule when performing carbon combustion removal during coke oven operation. It is an explanatory view showing a time schedule of an extruder, a guide car, and a coal loading car. 1... Carbonization chamber 2... Rising pipe 5...
Coke guide car 6... Charging port 7... Furnace cover for carbon combustion 8... Air pressure feeding device 9... Suction port 10... Collection hood 12... Top!
13.18.19... Hearth lid 14...
・Furnace cover removal machine 15...Shiro door 16.17...
・Deposit table 22...adhesive carbon 23...
Fire extinguisher or packet truck 30...Hot air blowing device

Claims (1)

[Scope of Claims] 1. After opening the riser pipe canopy of the empty oven after coke has been extruded from the coke oven carbonization chamber or the cover of the coal loading port adjacent to the riser pipe, one side of the furnace cover is removed and the kiln port is opened. A carbon combustion furnace lid having an air intake port and an air outlet is attached to the coke, and air, etc. is blown into the carbonization chamber through an air pipe of an air pressure feeding device mounted on a train or the like to burn adhering carbon. How to remove carbon deposits from a furnace. 2. The method for removing carbon deposits in a coke oven according to claim 1, characterized in that a carbon combustion furnace lid is used in which a plurality of carbon combustion air outlets are vertically arranged. 3. While coke is being extruded in the relevant kiln according to the work schedule, the carbon removal work of blowing air etc. to burn off the adhering carbon is repeated for each kiln from the previous kiln that finished coke extrusion. A coke oven operating method characterized by: 4. The method of operating a coke oven according to claim 3, wherein the carbon removal work is carried out using a carbon combustion furnace cover in which a plurality of carbon combustion air outlets are vertically arranged.