JP2000273458A - Method and device for controlling adhesion of tar to place close to door opening of carbonization chamber of coke oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control the adhesion of carbon adhered to the periphery of a door opening portion by removing tar which is stayed on the door opening portion of a coke oven carbonization chamber as a raw material for the carbon. SOLUTION: Compressed gas-jetting nozzles 2 which can jet a compressed gas on tar stayed close to the door opening portion 3 of the carbonization chamber of a coke oven are attached to the lower portion of the support bracket 5 of a sheet surface cleaner loaded on an extruder. The jetting axes of the compressed gas-jetting nozzles 2 are obliquely downward directed to the oven bottom at the door opening portion 3. Each compressed gas-jetting nozzle 2 is connected to a compressor and a compressed gas tank through a control valve, and compressed air is forcefully charged from the compressor and the compression gas tank.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for suppressing the production of carbon adhered to the bottom of a coke oven, which inhibits the door detachability of a carbonization chamber in a coke oven. The present invention relates to a method and an apparatus for suppressing tar sticking in the vicinity of a door opening of a coke oven carbonization chamber by removing tar remaining in a section.

[0002]

2. Description of the Related Art In a coke oven using a coke oven, which is currently widely used, coking coal as a coke raw material is charged from a plurality of charging holes provided on the upper surface of a coke oven carbonization chamber, and dry distillation is completed. Later, a method of opening the doors provided on the left and right sides of the coking chamber and extruding coke in the coking chamber from one door opening to the other door opening using an extruder is generally performed. .

[0003] In such equipment, the volatile components generated during carbonization are recovered as fuel gas, but tar and the like having low volatility accumulate in the furnace bottom of the carbonization chamber. Most of these tars are discharged together by extruding coke from the carbonization chamber, but the tar at the furnace bottom of the extruder-side door opening is not extruded together with the coke, and if left to stand it will solidify and stick to carbon. And grow. If the grown adhered carbon grows until it interferes with the door, it will hinder the door attaching / detaching operation.

[0005] More specifically, as shown in FIG. 5, which shows the state of retention of tar near the door opening of the coking chamber, the furnace bottom 3 a of the extruder-side opening 3 in the coking chamber 4 and inserted into the opening 3. The bottom surface of the door brick 12a is usually about 50 m
There is a gap δ of about m. This gap δ is a clearance required for attaching and detaching the door 12, but the tar 13 staying in this gap δ may be extruded together with coke when the coke 15 in the carbonization chamber 4 is extruded by an extruder. Because there is not, it stays as it is. This tar 13
Although it is a liquid having a high viscosity but a fluidity at the initial stage of staying, if left as it is, it is gradually denatured and solidified by heat transfer from the carbonization chamber 4 side. As a result of this repetition, as shown in FIG. 6, the fixed carbon 14 at the furnace bottom 3a of the coking chamber 4 gradually grows, and the clearance δ 'between the door bricks 12a decreases. This fixed carbon 14
The thickness from the bottom of the furnace is called the fixed carbon height.

[0005] The height of the bonded carbon increases and the door brick 1
When the clearance δ ′ with the door 2a is lost, the door brick 12a and the fixed carbon 14 interfere when the door 12 is mounted. When this state progresses, when the door 12 is mounted, the stuck carbon 14 at the furnace bottom collides with the door brick 12a, and the door 12 is warped or the brick 12a is damaged. The opening 3 cannot be sealed. Reference numeral 16 in FIG. 5 denotes a seal plate such as a knife edge which is brought into contact with the sheet surface.

In recent coke oven operations, automatic operation of mobile machines has been promoted in order to reduce operations in an environment generally referred to as 3K operation. Since it is a main factor of the reduction in the rate, removal and reduction of the adhered carbon 14 in the vicinity of the door opening 3 is an important issue in promoting automation of the coke oven operation. In general, the removal of the adhered carbon is carried out by moving the extruding device after the coke extrusion is completed and before closing the door opening 3 with the door 12, and manually removing the carbon 14 adhered to the furnace bottom 3a. It is done by shaving off at.

However, in this method, the automatic operation of the apparatus must be temporarily stopped for the work of removing the adhered carbon 14, and the extruding apparatus must be moved for safety. It prolongs significantly, causing a drop in productivity. As a countermeasure, a device has been developed that automatically removes the sticking carbon using a rolling cutter or the like.
It is technically difficult to remove the stuck carbon in a complicated place such as a corner, and it cannot be said that a sufficient effect is exhibited. For this reason, at present, human labor has not been eliminated.

As a method of removing carbon adhering to the wall surface in the coke oven carbonization chamber 4, Japanese Patent Application Laid-Open No.
As described in JP-A-85-85, etc., there is a method in which a nozzle for ejecting a gas containing oxygen is inserted into the carbonization chamber 4 and the gas ejected from the nozzle burns and removes the adhered carbon in the furnace. However, in this method, although removal of carbon adhering to the high-temperature portion inside the carbonization chamber 4 can be expected, tar remaining at the end such as the vicinity of the door opening 3 into which the door 12 is inserted, which is a subject of the present invention, is retained. Because of the low temperature of 13, combustion removal was not possible even if oxygen was supplied into the carbonization chamber 4.

[0009]

As described above, in the conventional coke oven operation, the means for simply and effectively removing the carbon adhered to the vicinity of the door opening 3 on the extruder side of the furnace bottom is provided. Was not until. The present invention has been made in view of such a problem, and in order to suppress the generation of the sticking carbon which is a main factor of such a problem, the tar remaining in the door opening which is the source of the sticking carbon is removed. Then, it is an object to suppress the adhesion of tar.

[0010]

According to the present invention, the process of producing the above-mentioned fixed carbon is started when viscous liquid tar adheres to the furnace bottom first, and this is particularly the case where the metallic tar which is the open end of the furnace bottom is opened. It is made in consideration of the fact that it grows as strong solid carbon especially in the corner part of the frame part of the frame, and an effective solid carbon removing device is effective simply by mechanically removing the solid carbon. It has been conceived that it cannot be obtained, and it has been made in view of the necessity to devise a method of removing the viscous liquid tar in the early stage of production in order to solve this.

That is, in order to solve the above-mentioned problem, an invention according to claim 1 of the present invention is a method for suppressing the adhesion of tar remaining near a door opening of a coke oven carbonization chamber, the method comprising: Provided is a method for suppressing tar adhesion near a door opening of a coke oven carbonization chamber, which comprises blowing compressed gas toward tar remaining near a door opening after extruding coke and blowing the compressed gas toward the inside of the furnace. Things.

[0012] Next, a second aspect of the present invention is to provide a pressurized sheet for a coke oven extruder, which is attached to a lower portion of the coke oven side of the sheet surface cleaner and which is compressed gas into tar remaining near the door opening of the coking chamber. And a compressed gas supply nozzle for supplying a compressed gas to the compressed gas injection nozzle. A tar sticking suppression device near a door opening of a coke oven carbonization chamber is provided. Things.

[0013]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic side view showing the installation of a compressed gas ejection nozzle of the tar sticking suppression device, and FIG.
Is an enlarged schematic plan view thereof. First, the structure will be described. A compressed gas ejection nozzle 2 of a tar sticking suppression device is fixed to a lower portion of a cleaner portion 7 of a sheet surface cleaner 1 mounted on an extruder body, and a door opening of a coke oven carbonization chamber 4 is provided from the nozzle 2. The structure is such that compressed air is blown toward the metal frame at the furnace bottom end of the part 3.

The cleaner 7 is supported by a support bracket 5 that moves up and down and moves up and down with respect to the door opening 3 by an actuator (not shown), and a seat fixed to the support bracket 5 and provided around the door opening 3. A brush portion 6 that slides on the surface. The plurality of compressed gas ejection nozzles 2 are attached to the lower part of the support bracket 5 so as to be directed toward the lower part of the space side of the door opening 3 with respect to the brush part 6. In FIG. 1, the brush portion 6 is illustrated as an integral body that is long in the vertical direction, but may be divided into a plurality in the vertical direction.

The jet axis of the compressed gas jet nozzle 2 is directed obliquely downward toward the furnace bottom near the door opening 3a. Each compressed gas ejection nozzle 2 is connected to a compressor or a compressed gas tank 9 via a control valve 8, and can eject compressed air pumped from the compressor or the compressed gas tank 9. In FIG.
0 indicates a nozzle header.

Next, the operation of the above device will be described. When the carbonization is completed, the doors on the left and right sides of the coke oven carbonization chamber 4 are opened, and then the extrusion ram of the extruder is inserted into the carbonization chamber 4 to push out the red hot coke in the carbonization chamber 4 from the other opening. . After the extrusion of the coke is completed, the sheet surface cleaner 1 is advanced to the door opening 3 side, and the brush 6 of the cleaner 7 contacts the sheet surface provided on the outer periphery of the opening 3 and is continuously moved up and down. The sheet surface is cleaned. At the same time as the cleaning operation, the tar sticking suppression device is operated to supply the compressed gas to the compressed gas ejection nozzle 2.

As a result, as shown in FIG. 3, during cleaning of the sheet surface near the door opening, the compressed gas
The compressed air is blown toward the door opening 3 from the bottom of the furnace. As a result, compressed air is blown against the tar 13 which is still liquid, the tar 13 is pushed into the carbonization chamber 4, and the tar 13 is removed from the furnace bottom portion facing the lower surface of the door brick, and as a result, The growth of adhered carbon near the door opening is suppressed.

Here, it is desirable that the angle θ of the ejection axis of the nozzle 2 is set in a range downward from 20 degrees to 70 degrees with respect to the horizontal. If the angle θ of the ejection shaft is less than 20 degrees, the time during which the gas ejected from the nozzle 2 does not directly hit the tar 13 during the vertical movement of the cleaner 7 increases, so that the tar 13 cannot be removed effectively. Further, even when gas is ejected at an angle exceeding 70 degrees, tar 13 is removed from carbonization chamber 4.
Is not preferred because the effect of blowing inward is reduced.

Further, the pressure of the compressed gas to be ejected must be 4 kg / cm ² or more as the collision pressure with the tar 13. Below this, there is no effect of blowing off the tar 13. The upper limit of the impact pressure need not be particularly specified, the possibility of causing damage to the furnace bottom bricks themselves at 10 kg / cm ² or more pressure increases, carried out at a pressure of less than 10 kg / cm ² is It is suitable.

Here, since the apparatus according to the present invention obtains a predetermined effect by blowing off the tar 13 by the dynamic pressure of the compressed gas, any gas may be used as the compressed gas. Compressed air, nitrogen, oxygen, etc., which can be used in a factory at low cost, are preferred. In particular, oxygen,
When air is used, it is expected that the tar 13 is blown off from the furnace bottom near the opening as described above, and that the tar 13 is also burned and removed by the intensively supplied oxygen and the like and the heat in the furnace. Is more preferable.

In the above embodiment, the case where the compressed gas ejection nozzle 2 is provided on the sheet surface cleaner 1 has been described. However, the compressed gas ejection nozzle 2 is provided on the extrusion rack of the extruder, or separately and independently mounted on the extruder. You may. However, when the sheet surface cleaner 1 is provided as in the above-described embodiment, the tar 13 is removed during the cleaning of the existing sheet surface, thereby preventing the productivity of the coke production from being reduced. ,
There is no need to separately provide a mechanism for bringing the compressed gas ejection nozzle 2 closer to the door opening 3.

In the above description, the case where the ejection angle of the compressed gas ejection nozzle 2 is fixed is described as an example. However, the ejection angle θ in the vertical direction can be changed in accordance with the vertical movement of the cleaner unit 7. As a mechanism, the ejection angle may always be optimized. Further, by providing the above-described compressed gas ejection nozzles in two stages, even if the cleaner unit 7 moves up and down, the compressed air ejected from one of the nozzles may be always blown to the furnace bottom. Further, the compressed gas may be mainly injected into the corner portion by inclining the axis in the horizontal direction with respect to the predetermined nozzle.

[0023]

EXAMPLES The present invention was tested in a coke oven having a capacity of 66 furnaces / furnace and a production capacity of 2000 t / day. The compressed air spraying process was performed at each extrusion operation while the production rate was 1.3 times / day and the production rate per day was 30 days. The amount of compressed air to be sprayed is 2 Nm ³ per extrusion operation.
/ Min × 10 seconds.

FIG. 4 shows the transition of the growth of the fixed carbon during this time. As can be seen from FIG. 4, when the tar adhesion suppressing device according to the present invention was not used, the height of the adhered carbon became 50 mm about 20 days after the start of the operation, and the adhered carbon grew to the interference area with the door. On the other hand, when the present invention was carried out, almost no growth was observed even after 60 days, indicating that the generation of fixed carbon could be suppressed for a long period of time.

[0025]

As described above, by employing the present invention, the growth of carbon adhered to the extruder side door opening near the furnace bottom can be simply and effectively suppressed. As a result,
Door blocking failure due to the growth of the adhered carbon can be prevented. At this time, if the apparatus according to claim 2 is adopted, the growth of carbon adhered to the extruder side door opening near the furnace bottom can be easily performed without lowering the productivity for coke production and with a simple mechanism. And it can be suppressed effectively.

[Brief description of the drawings]

FIG. 1 is a schematic side view for explaining a tar sticking suppression device according to an embodiment of the present invention.

FIG. 2 is an enlarged schematic plan view for explaining a tar sticking suppressing device according to an embodiment of the present invention.

FIG. 3 is a view showing ejection of compressed gas from a compressed gas ejection nozzle according to the embodiment of the present invention.

FIG. 4 is a diagram showing the relationship between the number of treatment days and the height of the fixed carbon.

FIG. 5 is a view showing a relationship between the fixed carbon in the vicinity of the door opening and the door brick.

FIG. 6 is a diagram for explaining the growth of fixed carbon.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Seat surface cleaner 2 Compressed gas ejection nozzle 3 Door opening 4 Carbonization chamber 6 Brush section 8 Control valve 9 Compressor etc. 10 Nozzle header

Claims (2)

[Claims] 1. A method for suppressing sticking of tar remaining near a door opening of a coke oven carbonization chamber, wherein compressed gas is blown toward tar remaining near a door opening after extruding coke in a carbonization chamber. And a method of suppressing tar sticking in the vicinity of a door opening of a coke oven carbonization chamber. 2. A compressed gas can be injected to tar retained in the vicinity of a door opening of a coke oven carbonization chamber by being attached to a lower portion of a cleaner portion of a sheet surface cleaner mounted on an extruder of a coke oven on a coke oven side. An apparatus for suppressing tar adhesion near a door opening of a coke oven carbonization chamber, comprising: a compressed gas ejection nozzle; and compressed gas supply means for supplying a compressed gas to the compressed gas ejection nozzle.