JP2001262148A - Method of removing carbon sticking to the inner parts of the carbonization chamber in coke furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To develop the techniques that removes the carbon sticking to the inside of the carbonization chamber by burning the carbon with the oxygen in an oxygen-containing gas in the operations of a coke oven. SOLUTION: In this method of removing the carbon sticking to the inside of the carbonization chamber by burning the adhering carbon with the oxygen included in an oxygen-containing gas, the exhaustion gas that is exhausted from the carbonization chamber and comprises a variety of components including unburnt oxygen gas exhausted from the carbonization chamber is exhausted from both of the gas-rising pipe set on the carbonization chamber and one or more of coal chargers arranged near a plurality of the gas-rising pipes in the coal-charging holes. The outside air is suitably used as an oxygen-containing gas. The air blowing is started from the coal-charging holes on the distant side from the gas-rising pipe, while a tentative lid having an exhaustion through- pipe bored on the upper part is set to the coal-charging hole and the gas is allowed to rise up as it is brought into contact with the carbon sticking to the inner peripheral face of the coal-charging hole and to pass through the exhaustion pipe.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for removing carbon adhering to a coke oven by burning carbon adhering to the inside of a coking chamber with an oxygen gas contained in an oxygen gas-containing gas.

[0002]

2. Description of the Related Art In an operation for producing coke in a coke oven, a carbon is generated by pyrolysis of hydrocarbons and tar generated in a carbonization process of coal charged in a coking chamber, and carbon is deposited. Particles adhere to the surface of each portion of the carbonized interior wall brick. FIG. 3 shows a schematic vertical sectional view of the coke oven carbonization chamber. In the upper part of the coking chamber 1, a plurality of coal charging holes 2 are provided for receiving coking coal from a coal-charging car 10 traveling above the coke oven in the furnace length direction of the coke oven. Have been. The coke which has been subjected to a predetermined coal dry distillation in the coking chamber 1 is extruded into a coke guide wheel (not shown) by a ram (not shown) installed in the extruder with the furnace lids 4 and 5 on both sides of the coking chamber 1 opened. It is. On the other hand, the gas generated during the coal carbonization passes through the gas riser 6 and is stored as coke oven gas. In the coke oven, the ambient temperature in the upper space in the coking chamber 1 increases with an increase in the operation rate, and the amount of carbon adhering to the inside of the coking chamber tends to increase as the temperature increases. In this way, a large amount of carbon adheres to the upper portion 7 of the carbonization chamber, and the amount of carbon attached particularly to the inner peripheral wall 8 of the coal hole 2 sharply increases. FIG. 4 shows a state of the carbon 9 attached to the inner peripheral wall 8 of the coal charging hole 2.

[0003] Such adhesion of carbon to the inner surface of the carbonization chamber closely blocks the joints of the inner wall bricks, and thus has an effect of preventing gas leakage outside the carbonization chamber. However, as the amount of deposited carbon increases and grows, the thermal conductivity from the inner wall into the carbonization chamber decreases, the productivity decreases due to the decrease in the effective internal volume of the carbonization chamber, and the extruder ram due to the carbon adhered during coke extrusion. Problems such as clogging and damage to bricks, and furthermore, obstruction of charging work due to narrowing of the coal charging hole occur.

Therefore, various techniques have been proposed for removing carbon adhering to the surface inside the carbonization chamber. As a principle of removing adhered carbon, a method has been proposed in which carbon is burned with oxygen, and the combustion gas is exhausted outside the carbonization chamber as exhaust gas. For example, Japanese Patent Application Laid-Open No. Sho 62-161883 discloses a carbonization chamber for removing excessively adhered carbon without impairing the sealability of joints due to carbon adhesion which exerts an important effect on the function of the carbonization chamber. There is disclosed a device for inserting a gas injection lance into a nozzle and spraying an oxygen-containing gas from a nozzle of the nozzle in parallel to the carbonization chamber wall surface to burn and remove carbon attached to the wall surface (hereinafter referred to as “prior art 1”). )). According to the prior art 1, the oxygen-containing gas flows along the wall surface and burns and removes the adhered carbon while forming a swirling flow in the carbonization chamber. Therefore, the excessive adhered carbon on the wall surface is removed without damaging the wall substrate. Is done. Japanese Patent Application Laid-Open No. Hei 8-218075 discloses that a plurality of gas injection nozzles are provided above an inner peripheral portion of a coal charging hole in order to remove carbon attached to a coal charging hole at an upper portion of a carbonization chamber. There has been disclosed a device for injecting high-pressure air downward to remove carbon attached to the inner peripheral surface of a coal charging hole (hereinafter referred to as prior art 2). According to Prior Art 2, the carbon adhering to the coal charging hole can be removed in a short time.

[0005]

According to the prior art 1 described above, excess carbon adhering to the side wall in the carbonization chamber is removed.
Although it can be uniformly burned and removed, it is difficult to remove carbon attached to the upper part 7 of the carbonization chamber, particularly carbon 9 attached to the inner peripheral wall 8 of the coal charging hole 2 as shown in FIG. It is considered that this is because in the gas swirling state in the coking chamber according to the prior art 1, the gas flow to the depressed place such as the inside of the coal charging hole is difficult to reach. Further, the inner peripheral surface 8 of the coal charging hole 2 on the side close to the gas riser 6
The amount of carbon attached to the surface is even greater.

According to the prior art 2, although it is effective to burn and remove carbon adhering to the inner peripheral surface of the coal charging hole, further simplification of the attached carbon removing device is desired.
The reason is as follows. That is, considering the operation procedure of the coke oven, the method of removing the carbon adhering to the inner wall of the coking chamber by combustion is a precondition that after the coke oven is taken out of the coking chamber, it is performed as a preparation work for the coal charging operation. . Therefore, it is desirable that the operation of burning and removing the adhering carbon be a work form capable of simultaneously removing the adhering carbon to the coal charging hole and the adhering carbon to other portions such as the inner wall of the carbonization chamber. Therefore, it is desirable that the equipment used for this is capable of coping with the above-mentioned one unit operation.

[0007] From the above viewpoint, the operation of burning off carbon adhering to the inner wall of the coking chamber must always be performed in any coking chamber. Therefore, it is most desirable to equip the coal-equipped car (reference numeral 10 in FIG. 3) with the apparatus for removing adhering carbon in terms of space and equipment cost.

[0008] Accordingly, an object of the present invention is to perform a single unit operation of carbon adhering to various parts of a carbonization chamber such as a side wall and an upper part in a carbonization chamber of a coke oven. To develop a technology for removing and burning adhering carbon, which is effective for removing adhering carbon on the inner peripheral surface of the coal charging hole in the upper part of the room, especially on the side near the gas riser pipe, and at the lowest possible cost. It is in.

[0009]

Means for Solving the Problems The inventors of the present invention have conducted the following studies from the above viewpoints, and have obtained the following findings. Oxygen-containing gas for the combustion removal of carbon deposited in the carbonization chamber uses a coal charging hole far away from the gas riser and supplies it from here, and the exhaust gas after burning the deposited carbon is The gas is exhausted from a gas riser provided on the side opposite to the oxygen-containing gas supply side. However, because of the large amount of scale attached and the depression, it is difficult to remove and burn by simply contacting and flowing an oxygen-containing gas in the carbonization chamber. In particular, in order to burn and remove the scale attached to the inner peripheral surface of the coal charging hole. In addition, it is necessary to keep the oxygen potential for combustion removal of the adhered scale remaining in the exhaust gas, and to efficiently contact the exhaust gas with the scale. From such a viewpoint, the present inventors have found that a part of the exhaust gas is
By discharging the coal from the coal charging hole in a state where the contact flow with the inner peripheral surface of the coal charging hole with remarkable carbon deposition is maintained, it is found that the carbon deposited on this portion can be effectively burned and removed. Was.

[0010] The present invention has been made based on the above findings, and the gist thereof is as follows. The method for removing carbon attached to the interior of a coke oven carbonization chamber according to claim 1 includes blowing an oxygen-containing gas into the coke oven chamber of the coke oven,
The carbon adhering to the inside of the carbonization chamber is burned and removed. At this time, an oxygen gas component is left in the exhaust gas. And
It is characterized in that a part of the exhaust gas is discharged from a gas riser provided in the upper part of the carbonization chamber, and the remainder of the exhaust gas is discharged from a coal charging hole near the gas riser. Thus, it is possible to burn and remove the adhering carbon on the entire inner wall of the carbonization chamber including the inner peripheral surface of the coal charging hole.

According to a second aspect of the present invention, there is provided a method for removing carbon adhering to the interior of a coke oven carbonization chamber, wherein air is used as the oxygen-containing gas in the coke oven carbonization chamber. Is blown from a coal charging hole provided on a side far from the gas riser.
On the other hand, the exhaust gas is discharged from both the gas riser and the coal charging hole. At this time, the coal charging hole used for discharging the exhaust gas shall be located on the side closer to the gas riser and has a large amount of adhering carbon. Is selected. As for the exhaust method, an exhaust pipe for allowing exhaust gas to escape is fitted with a temporary lid penetrating the upper part of the exhaust pipe, which is attached to the coal charging hole, and the exhaust gas adheres to the inner peripheral surface of the coal charging hole. It is characterized in that it comes into contact with the carbon that has been burned and removed so that it rises and is discharged from the exhaust stack. In addition, by controlling the composition of the components in the exhaust gas from the coal charging hole so as not to impair environmental conservation, the exhaust gas from the coal charging hole can be released to the atmosphere.

According to a third aspect of the present invention, there is provided an apparatus for removing carbon adhering to the interior of a coke oven carbonization chamber, which burns and removes carbon adhered to the interior of the coke oven carbonization chamber. Gas injection lance mechanism provided with a gas injection lance provided with an oxygen-containing gas injection nozzle, and a high-pressure gas supply for supplying the high-pressure oxygen-containing gas to the gas injection lance mechanism A mechanism and a charging hole exhaust mechanism including a coal charging hole temporary lid provided through an upper portion of an exhaust pipe for discharging a part of exhaust gas generated in the carbonizing chamber from the carbonizing chamber. Is characterized by the fact that

According to a fourth aspect of the present invention, there is provided an apparatus for removing adhering carbon in a coke oven carbonization chamber.
The gas injection lance mechanism, the high-pressure gas supply mechanism, and the charging hole exhaust mechanism are all characterized in that they are provided in a coke oven coal-equipped car. As described above, all of the components for removing adhering carbon inside the coking chamber are installed in the coal-equipped vehicle, so that the adhering carbon can be removed at any time in any coking chamber during the coke oven operation period. This is advantageous in efficiency.

[0014]

Next, the present invention will be described with reference to the drawings. FIG. 1 is a schematic perspective view of a partially cutaway cross section for explaining an example of a desirable apparatus used for carrying out the method for removing adhering carbon in a coke oven carbonization chamber of the present invention. FIG. It is a schematic front view of the charging hole exhaust mechanism explaining the mounting method of the coal charging hole temporary lid.

In FIG. 1, a coal injection truck 10 running in a longitudinal direction above a coke oven 11 is provided with a gas injection lance mechanism 12, a high-pressure gas supply mechanism 13, and a charging hole exhaust mechanism 14.
Is provided, and a high-pressure oxygen-containing gas is supplied from the high-pressure gas supply mechanism 13 to the gas blowing lance mechanism 12,
It is blown into the carbonization chamber 1.

The gas injection lance mechanism 12 includes a lance 1
5, a holder 16 and a lifting device 17;
5, a gas injection nozzle 18 is provided on the outer peripheral surface. As a result of the oxygen-containing gas injection from the gas injection nozzle 18, the formation of local high-temperature areas such as hot spots on the carbonized indoor wall bricks, in order not to damage the brick joints or damage the bricks on the back side of the attached carbon. The gas injection direction is designed to have an angle of incidence that is oblique or nearly parallel to the wall surface of the carbonization chamber.

The high-pressure gas supply mechanism 13 includes a gas blower 1
9, a gas supply pipe 20, a control device 21, and an operation panel 22 for supplying oxygen-containing gas to the gas blowing lance mechanism 12. As the oxygen-containing gas, there are oxygen gas, air and the like, and air is desirable in terms of cost. The supply conditions of the oxygen-containing gas are as follows: in order to ensure the effect of burning and removing adhered carbon, and to ensure the stability of the temperature inside the carbonization chamber,
The flow rate and flow rate of the injected gas are set in appropriate ranges in accordance with the oxygen gas concentration in the gas and the angle of incidence on the wall surface of the carbonization chamber.

The advantage of the present invention is that the carbon adhering to the inner wall including the upper part in the carbonization chamber 1 and the coal charging hole especially on the side close to the gas riser 6, for example, the inner peripheral surfaces of 2e and 2d in FIG. It is superior in simultaneously removing the carbon adhering to 8e and 8d. In order to achieve this, the exhaust gas is discharged from the coal charging hole among the coal charging holes. Therefore, it is necessary that an appropriate amount of oxygen gas remains in the exhaust gas.

As shown in FIG. 2, the charging hole exhaust mechanism 14 includes coal charging hole temporary lids 23e and 23d, exhaust pipes 24e and 24d provided therethrough and provided at the upper part, and a lifting / lowering / swiveling mechanism 25e. , And 25d, each elevating and lowering mechanism supports each exhaust stack together with the temporary coal charging lids 23e and 23d, and ascends and lowers and rotates and mounts them in the coal charging holes 2e and 2d. Here, the elevating and turning mechanisms 25e and 25d
It is mounted on a coal-equipped vehicle 10.

Using the above-described apparatus, the lance 15 is inserted into the carbonization chamber 1 through the coal charging holes 2a, 2b, and 2c, and an oxygen-containing gas is injected from the gas injection nozzle 18 to cause the carbon adhering to the inside of the carbonization chamber. Perform combustion removal work. This operation is performed after the coke is discharged from the carbonization chamber 1 and before the coal charging operation while the furnace temperature is in a high temperature state.
Therefore, the oxygen gas in the oxygen-containing gas blown into the carbonization chamber 1 reacts with carbon attached to each part in the carbonization chamber 1 to generate CO ₂ . The carbon adhering to the side wall and the upper portion in the carbonization chamber 1 is burned and removed mainly by the injection flow of the oxygen-containing gas blown from the injection nozzle 18 of the lance 15 and the swirl flow in the carbonization chamber 1, while the combustion is removed. The carbon 9 attached to the inner peripheral surfaces 8e and 8d of the coal charging holes 2e and 2d near the gas riser tube side,
Since the residual exhaust gas of the oxygen gas flows while sufficiently contacting, the combustion removal effect is exhibited.

[0021]

EXAMPLES The present invention will be further described with reference to examples. FIG.
Using the apparatus shown in FIG. 2, the carbon adhered in the carbonization chamber 1 after the coke was discharged from the kiln was burned off. The gas injection lances 15 were inserted into the three coal charging holes 2a, 2b, 2c far from the gas riser pipe 6. The lance is provided with gas injection nozzles 18 in three stages. The oxygen gas injection direction was set to an incident angle of 22.5 ° with respect to the carbonization chamber side wall surface, and the nozzle outlet flow rate was set to a low speed of 15 m / s (Example 1) and a high speed of 20 to 100 m / s (implementation). Example 2) -2
Tested at standard. In the high-speed flow test, the compressor was started.

There are two types of exhaust gas outlets, the gas riser 6 and the coal charging hole 2. The purpose of exhausting from the coal charging hole 2 is to remove and remove carbon adhering to the inner peripheral wall 8. If the amount of adhering carbon is relatively large and the entire amount of exhaust gas is discharged from the gas riser 6, it is removed by combustion. 2, 2 e and 2 on the side close to the difficult coal charging hole 2, namely the gas riser 6
Exhaust gas was discharged from d.

A normal temperature air was supplied to the inside of the carbonization chamber 1 under the above conditions to perform a combustion removal test of the deposited carbon. Table 1 shows the results of visual observation of the tests of Examples 1 and 2 by the carbon removal method within the scope of the present invention and Comparative Example 1 by the carbon removal method outside the scope of the present invention. As Comparative Example 1, among the test conditions of Examples 1 and 2 described above, the results of the exhaust gas exhaust method in which the entire amount of exhaust gas was exhausted from the gas riser 6 and the other conditions were the same were also described.

[0024]

[Table 1]

By bringing a gas having an oxygen potential into flow contact, the carbon adhering to the inner peripheral surfaces of the charging holes 2d and 2e close to the gas riser which could not be removed until now can be removed. The load of manual removal of carbon in the charging hole was significantly reduced, and the frequency of work at the furnace top was reduced, which also helped to ensure worker safety.

[0026]

As described above, according to the present invention,
In a room-type coke oven, carbon adhering to various parts of the carbonization chamber during operation can be efficiently removed within the working time of the conventional level. That is,
Simultaneous removal of both the carbon deposited on the inner surface of the coal charging hole near the gas riser and the upper part of the carbonization chamber where the amount of deposited carbon is high, and the carbon deposited on the wide side wall of the carbonization chamber at the same time Can be. By automating the carbon removal work on the inner peripheral surface of the charging hole, which had been done manually, a great effect was obtained, such as improvement of work efficiency and ensuring safety. It is possible to provide a method and an apparatus for removing carbon adhering to the inside of the coke oven carbonization chamber, and industrially useful effects are obtained.

[Brief description of the drawings]

FIG. 1 is a partially cut-away schematic perspective view of an example of a device for removing adhering carbon in a coke oven carbonization chamber used for carrying out the present invention.

FIG. 2 is a schematic front view of a charging hole exhaust mechanism for explaining a method of mounting the coal charging hole temporary cover of FIG. 1;

FIG. 3 is a schematic longitudinal sectional view illustrating a configuration of a coking oven type coke oven chamber.

FIG. 4 is a schematic longitudinal sectional view illustrating a state of carbon attached to an inner peripheral wall of a coal charging hole. Show.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coalization room 2 Coal charging hole 3 Charging lid 4 Furnace lid (extrusion machine side) 5 Furnace lid (Coke guide car) 6 Gas riser 7 Upper part of carbonization chamber 8 Inner peripheral wall 9 Adhered carbon 10 Coal car 11 Coke oven 12 Gas Blow-in lance mechanism 13 High-pressure gas supply mechanism 14 Charge-hole exhaust mechanism

Claims (4)

[Claims] 1. A method for blowing an oxygen-containing gas into a coking chamber of a coke oven to burn and remove carbon adhering to the inside of the coking chamber, wherein various types of gas containing unburned oxygen gas discharged from the coking chamber are used. Exhaust gas comprising the components, a gas riser provided in the upper part of the carbonization chamber, and at least one of a plurality of coal charging holes provided in the upper part of the carbonization chamber located closer to the gas riser. Exhausting from both of said coal charging holes. 2. A method for removing carbon adhering to the interior of a coke oven carbonization chamber. 2. The method according to claim 2, wherein air is used as the oxygen-containing gas, and the oxygen-containing gas is blown into the coke oven carbonization chamber through the coal charging hole provided on a far side from the gas riser. In the method of exhausting the exhaust gas from the coal charging hole, an exhaust pipe is attached to the coal charging hole with a temporary lid provided to penetrate the upper portion, and the exhaust gas is discharged to the inner peripheral surface of the coal charging hole. Raise while contacting the attached carbon,
2. The method for removing carbon adhering to the interior of a coke oven carbonization chamber according to claim 1, wherein the carbon is discharged through the exhaust stack. 3. An apparatus for burning and removing carbon adhering to the interior of a coke oven carbonization chamber, wherein gas is provided from a coal charging hole into the interior of the carbonization chamber and provided with an oxygen-containing gas injection nozzle. A gas injection lance mechanism having a lance, a high-pressure gas supply mechanism for supplying the high-pressure oxygen-containing gas to the gas injection lance mechanism, and discharging a part of exhaust gas generated in the carbonization chamber from the carbonization chamber. An apparatus for removing adhering carbon in a coke oven carbonization chamber, comprising: a charging hole exhaust mechanism provided with a coal charging hole temporary lid provided so as to penetrate an exhaust pipe at an upper portion thereof. 4. The coke oven carbonization chamber according to claim 3, wherein the gas injection lance mechanism, the high-pressure gas supply mechanism, and the charging hole exhaust mechanism are installed in a coke oven of the coke oven. An attached carbon removal device.