JPH08109381A - Method for removing material attached to upper part of lid of coke oven - Google Patents

Abstract

PURPOSE: To suppress smoking and dust generation in opening an oven lid by removing carbon or coal attached or deposited on the upper part of oven lid in a coke oven before taking out coke from the oven. CONSTITUTION: This removing method is to form an opening part in a part of a oven lid or oven brick until coke is taken out after dry distillation is finished, blow a compressed inert gas or a high pressure gas into carbon or coal attached or deposited on an upper horizontal part of the oven lid and remove the carbon or coal by pressure or combustion.

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 or coal adhered to or deposited on the upper portion of a coke oven furnace lid.

[0002]

2. Description of the Related Art Pulverized coal scattered at the time of charging coal and coke oven gas generated during coal carbonization are pyrolyzed and produced in both furnace lids on the extruder side and guide car side in a coke oven carbonization chamber. The deposited carbon adheres. Especially in the horizontal part of the upper part of the furnace lid, there is a clearance between the upper and lower surfaces of the plug of the furnace lid brick and the kiln mouth frame so as not to hinder the desorption work. Coal deposits.

In the combustion chamber row which sandwiches the carbonization chamber of the coke oven from both sides, the end combustion chamber has a lower temperature than the central portion due to heat radiated toward the end, that is, the kiln mouth, and the upper portion of the furnace lid has the combustion chamber. When coal powder adheres or accumulates due to the fact that it is located higher than the top, the coking speed is much slower than that of coal in the direction inside the carbonization chamber.

[0004] The accumulated coal cannot be sufficiently coked before the kiln is discharged, and is in a state of incomplete dry distillation or a semi-coke state of weak strength. , And cause yellow smoke or dust scattering.

Conventionally, as a symptomatic treatment, there has been practiced a technique of covering the upper part and side surface of the kiln mouth with a suction hood to absorb dust and smoke.

[0006] However, this method can be applied after the work of removing the furnace lid, and even if the dust collecting hood is set, the smoke and dust generated from the adhered deposit cannot be completely trapped. . In particular, even if the dust collection effect is exhibited in the upper part near the kiln opening, the furnace lid is once moved to a slightly separated position for extrusion work and subsequent kiln opening cleaning.
It will be applied to the furnace lid cleaning device.

Therefore, not only the source of yellow smoke and dust when the furnace lid is removed, but also the furnace lid is a source of dust in a series of operations until the cleaning of the furnace lid is completed.

On the other hand, as a method for removing the carbon generated on the furnace wall of the carbonization chamber, there is a method using an acoustic transmitter provided on a ram beam of a coke extruder or an oxygen-containing gas blowing device.
Already, JP-A-3-195797 and JP-A-2-243.
No. 92 is disclosed. Further, a method for removing carbon from a furnace wall using a trolley instead of an extruder is disclosed in JP-A-5-7107.
No. 7 publication.

[0009]

DISCLOSURE OF THE INVENTION In the prior art, dust collecting hoods are provided on the upper and side surfaces of the outer surface of the kiln mouth of the carbonization chamber to prevent scattering and smoke generation of carbon deposited on the furnace lid and undistilled coal when the furnace lid is opened. It was something to suck. But,
In the case of this conventional technique, it can be applied after the work of removing the furnace lid, and the carbon attached to and deposited on the furnace lid that is opened to the outside is violently scattered by the ascending air current due to the sensible heat of the furnace lid, and is installed in the upper part or the surrounding area. The dust collection hood cannot completely capture the dust, and a considerable amount of dust and smoke is generated.

In particular, the furnace lid is once moved to a slightly distant position for the extrusion work and subsequent cleaning of the kiln, and the furnace lid cleaning device is involved. However, the furnace lid is removed from the kiln opening to the cleaning position. During the process of moving and after moving, it is difficult to install the dust collecting hood in space,
Even if it can be installed, it is difficult to install due to the enormous amount of capital investment, which is a factor of deteriorating the surrounding environment.

It is obvious that none of the above-mentioned prior arts already disclosed removes the carbon adhering to or depositing on the furnace lid, but it is further disclosed in JP-A-3-19579.
No. 7 and Japanese Patent Laid-Open No. 2-24392, the removal work is performed in the process of discharging the coke from the carbonization chamber, and cannot be a technique for preventing dust and smoke when the furnace lid is removed. In addition, in Japanese Unexamined Patent Publication No. 5-71077, not only can it not be a technique for preventing dust generation and smoke generation when the furnace lid is removed, but the carbonization chamber is emptied after the kiln is removed to carry out the furnace wall carbon removal work. Therefore, under the operating conditions where the coke oven operation rate is high and the cycle time is restricted, it is difficult to carry out the operation.

Therefore, the present invention removes carbon and coal adhered or accumulated on the upper part of the furnace lid in the coke oven before the kiln removal,
The purpose is to suppress smoke and dust when the furnace lid is opened.

[0013]

Means for Solving the Problems As a result of studies to solve the above problems, the present inventor has invented that it is a necessary condition that the removal work can be carried out before the furnace lid is opened. is there.

This method is used in a situation where the generated coke oven gas is not allowed to be mixed with an inert gas or combustion exhaust gas, and can be discharged to the outside by cutting the generated gas suction pipe in the middle thereof. During the period from the completion of carbonization in the coke oven to the kiln removal, with the lid on the top of the riser pipe opened, the carbon on the extruder lid on the side of the extruder side or the carbon deposited / deposited on the top of the brick Alternatively, an inert gas is blown to the coal to scatter and remove the carbon and / or coal in the coke oven.

Further, as a technique for removing not only the pressure effect but also a synergistic effect with the combustion result, instead of spraying an inert gas, an oxygen-containing gas is sprayed to burn and remove the carbon and / or coal. It is a thing.

Further, in the technique of spraying and removing an inert gas, if carbon or accumulated coal cannot be removed by opening the riser pipe top cover due to environmental conditions, etc., the riser pipe top cover is closed. Open the edge cutting damper with the generated coke oven gas suction system installed in the curved pipe section, and blow an inert gas from the extruder side furnace lid leveling port onto the carbon and / or coal that has adhered to or accumulated on the furnace lid brick upper part. It is characterized in that the powder coke and the gas that have been scattered and removed are sucked into the gas line of the generated coke oven and removed without scattering outside the system.

[0017]

The operation of the method for removing deposits from the upper portion of the oven lid of the coke oven according to the present invention will be described in detail below.

First, when coal is charged into the carbonization chamber, the coal rises into the carbonization chamber and adheres to the furnace wall and the surface of the furnace lid. As the corner rises, the area directly under the charging hole rises, causing coal inflow toward the furnace lid. As a cause of coal flow-in, the riser for sucking generated gas is strengthening the ejector to prevent gas and dust scattering to the outside air during charging,
This suction pressure can also be increased.

The furnace lid has a clearance of about 100 mm between it and the kiln opening in order to facilitate the attachment / detachment work to the kiln opening, and in particular, the surface level of the charging coal is evenly distributed above the extruder-side furnace lid. There is a level-insertion hole (hereinafter referred to as a leveling hole) for
The height of the furnace lid brick plug is about 500 mm lower.

Although coal easily deposits on the upper part of these furnace lids, the carbonization property is poor for the above-mentioned reason, and the carbonization inside coal is completed and the carbonization is completed, and the coal remains in a semi-coke state or remains as coal. It may be.

Therefore, it is necessary to remove this deposit before the dry distillation is completed and the furnace lid is opened. Therefore, the compressed inert gas or oxygen-containing gas is sprayed through the extruder-side furnace lid leveling port. The method of inserting the nozzle through the extruder-side furnace lid leveling port is excellent in that it can be carried out with the conventional structure without requiring major equipment modification. A long nozzle that blows gas through the leveling port to the upper part of the guide car side furnace lid is installed on the extruder, and it is first sprayed to and removed from the extruder side furnace lid upper deposit, and then inserted to the back to insert the guide car. A gas is blown to the upper furnace lid deposits.

In the case of the preheating charcoal charging method or the like, a working mode in which leveling is not performed is often adopted, and the furnace lid leveling port is often absent or closed. Therefore, it is difficult to select the nozzle insertion through the furnace lid leveling port, and it is advantageous to open a hole in a part of the furnace top brick of the coke oven body brick or a part of the furnace lid.

When a part of the furnace lid or a part of the brick at the top of the kiln is opened to provide an introduction hole for compressed gas, the upper brick of the kiln of the coke oven body brick is directed toward the top of the furnace lid in an L-shape or When the opening portion 12 is formed in a curved shape and the compressed inert gas or oxygen-containing gas is blown through this opening, it is not necessary to use a blowing nozzle, and the leveling opening provided in the extruder side furnace lid is opened. No need. This method has an advantage that the compressed gas can be directly blown to the deposit on the upper part of the furnace lid, but on the other hand, a blocking device is provided to maintain the sealing property, and an opening operation is not necessary to blow the compressed gas. There are some inconveniences that will be needed. When opening a part of the upper part of the furnace lid, the diameter is 10
It is preferable to provide an opening for inserting a nozzle of about 0 mm to 250 mm at the upper part of the coke layer, generally within 1 m from the top of the furnace lid. It is easy to open holes in the guide car side furnace lid, but at the same time it results in an increase in the number of coal deposits, and it should be selected according to the conditions of the charge and equipment.

The gas to be blown is preferably a compressed inert gas such as nitrogen gas or water vapor. In the case of an oxygen-containing gas, it burns when it is blown to the deposits and the temperature rises, causing the furnace lid to warp or deform, and the dust that has burned and peeled off to remove the riser pipe top lid. Because it is open, it scatters on the coke oven, and it is in a red heat state, which poses a risk of damage to surrounding equipment. In the case of water vapor, when the temperature is lowered, it may be condensed and cause damage to the wall bricks. Therefore, if nitrogen gas can be used, it is preferable to use nitrogen gas.

When using a compressed inert gas,
The removal energy is only the pressure of the compressed gas, and the pressure needs to be 100 kg / cm ² or more.

In order to reduce this pressure, a technique of blowing an oxygen-containing gas such as air is also established. Although this method has the above-mentioned disadvantages, it has an advantage that the deposit removing effect is equivalently obtained even when a lower pressure is supplied than in the case of an inert gas.

The work of opening and removing the top cover of the rising pipe is as follows.
It is effective in the situation where the inflow of oxygen or an inert gas into the generated coke oven gas is not allowed in order to avoid calorie restriction or danger.

However, when it is not possible to disperse the removed dust to the outside of the system in view of the environment or safety, a method of spraying gas without opening the rising coke oven gas suction system line and opening the rising pipe top cover Can also be taken. The gas, cheap water, and tar vapor generated in the coke oven are the collecting pipes of the products from each kiln after passing through the vertical pipe of the ascending pipe and being cooled in the curved pipe part and then passing through the pillow tube called Drymen. , It is cooled and separated by the gas cooling device via the suction men. In this suction line, the edge-cutting damper located between the curved pipe portion of the ascending pipe and the drymen has a role of operating opening / closing of the edge between each kiln and the drymen.

When the gas is blown into the carbonization chamber with the top lid of the ascending pipe closed, there is a method of opening the lid of the charging hole and discharging it to the furnace or connecting the edge to the drymen. When it is not environmentally preferable to discharge the edging, it is necessary to open the edging damper. When this method is carried out, the high pressure inert gas blowing method is preferable in order to avoid the inflow of oxygen into the generated coke oven gas. The scattered powder coke is recovered as sludge through the rising pipe together with the generated gas. When the oxygen-containing gas is mixed with the inert gas, it is effective to suppress the oxygen concentration to 5% or less, pressurize to a pressure of less than 100 Kg / cm ² and blow it to the deposit in a swirling flow.

The large carbon lumps blown out by the pressure of blowing the gas are kilned out together with the coke in both the high pressure inert gas blowing method and the oxygen-containing gas blowing method.

[0031]

Embodiment 1 FIG. 1 shows a layout of a furnace lid in a carbonization chamber, and FIGS. 2 and 3 show a carbon depositing or depositing portion on the furnace lid.
FIG. 4 shows an example of a nozzle according to the invention.

When coal is charged into the coke oven, the deposit shape on the surface of the coal is such that, in the case of ordinary wet coal, the area directly under the charging holes is raised and the space between the charging holes and the vicinity of the furnace lid are low. The angle of repose at the time of coal deposition becomes smaller and becomes horizontal as the water content of coal becomes lower.

In Example 1, dry carbon having a water content of 5% was charged into the coke oven 1. The angle of repose is smaller than that of wet charcoal due to the low water content, but it is easily lifted up by the impact of drop charging in the carbonization chamber, and because it is sucked at 60 mmAq by the riser ejector, the upper horizontal part of the guide car side furnace lid 4 is About 50 mm, and about 90 m on the leveling opening 8 of the extruder side furnace lid 6.
m of accumulated coal 13 was generated. In the figure, 2 is a coke layer, 3 is an ascending pipe, 5 is a guide car side furnace lid brick plug, and 7 is an extruder side furnace lid brick plug.

As a method of removing this before the kiln was taken out, a method of utilizing an extruder side furnace lid leveling port with few facility modifications was used. The extruder has a compressed nitrogen cylinder of 80 kg / cm ^2, a booster booster, and 4 holes with gas blowing holes facing the front, 4 on each side and 6 on the bottom. The blowing nozzle 10 having 6 rows was mounted. The blowing pressure of this gas blowing hole is about 150 kg / cm ^2.
And the gas injection hole 11 has a diameter of 10 mm.
14 rows were provided. For each hole, the hole at the tip end is directed forward, and the holes provided on the side face are directed in different directions for each row in the front direction, the rear direction, and the direct downward direction, without inching the blowing nozzle position. It has become possible to work at two fixed points, the front side and the back side of the carbonization chamber.

Nitrogen gas was injected for about 20 seconds each with the rising pipe top cover 9 open, and the scattered substances and the sprayed gas were diffused from the rising pipe top. Also contributed to the removal of deposits on both furnace lids and cleaned them. Reference numeral 14 in the drawing denotes an edge cutting damper.

[0036]

[Embodiment 2] FIG. 5 shows a partially opened structure of a brick structure of an upper part of a coke oven kiln.

In Example 2, dry coke having a water content of 2% was charged into the coke oven 1. The angle of repose of coal is small, and leveling work is not necessary everyday. The operation was performed with the leveling port of the extruder side furnace lid closed. Although the leveling opening was filled with refractory clay to form a brick plug at the same level as the furnace lid on the guide car side, coal deposition occurred in the upper horizontal part due to coal charging.

Since dust was scattered when the furnace lid was opened during the kiln removal, the deposit removal method before opening the furnace lid according to the present invention was applied. In the method of opening the furnace lid, the amount of coal flowing into the seal increases when dry coal with a small angle of repose is charged. The method of providing the through hole 12 was adopted.

A hole with a diameter of 50 mm is formed in the mirror brick with a depth of 15 mm.
Open 0 mm horizontally and extend downward from its tip for a length of 300
mm holes were opened downward. The guide car side and the extruder side are each provided with an L shape, a metal frame is fitted in the opening and is connected to the gas introduction pipe, and during dry distillation, a small amount of nitrogen gas is blown as an inert gas to block the dust. A three-way valve that can switch between the low-pressure inert gas pipe and the high-pressure air pipe was provided so that high-pressure air can be blown in during the removal of the accumulated carbon and coal before kiln removal.

In Example 2, paying attention to the fact that dust is easily combusted, a compressor for generating compressed air as an oxygen-containing gas is installed in an extruder and a guide car, and exhaust gas and scattered dust are discharged from the top of the rising pipe to the outside air. I decided to do it. The low pressure inert gas pipe was supplied from the utility pipe laid in the factory. High-pressure air is used for extruder and guide wheel 70
Supplied with a Kg / cm ² compressor. It was verified that the blowing angle of the air was from just above the horizontal part of the upper part of the furnace lid, but because the clearance between the brick plug and the ceiling of the carbonization chamber was small, the air flowed laterally and provided a surface-level cleaning action.

[0041]

[Third Embodiment] Most of the dust scattered from the top of the ascending pipe falls to the coke oven, and a part falls to the inspection corridor of the ascending pipe. The top of the coke oven is regularly suctioned and cleaned with an on-cleaner, but it is desirable not to drop scattered dust from the working environment.

Therefore, in order to prevent the gas from being released to the outside of the system, the lid of the ascending pipe is closed, the edge cutting damper with the generated gas suction line is opened, and the generated gas is sucked.

The operating conditions were the same as in Example 2 except that dry carbon having a water content of 2% was charged into the coke oven, but the blowing gas was introduced through the leveling port of the extruder side furnace lid.

In the third embodiment, a method of spraying an inert gas so that it can be sucked into the generated gas line was selected. However, nitrogen gas was used as the inert gas, and a high pressure cylinder was mounted on each of the extruder and the guide car. Then, the blowing nozzle was provided with 6 holes, each having 14 holes of 10 mm in diameter, as in the example, and 4 holes were provided at the tip end in the forward direction. Flexible nozzle heat resistant high pressure piping was used for joining the nozzle and the cylinder. With the riser lid closed, open the edging damper provided in the lower part of the riser curved pipe section, and after the coal is burned in the carbonization chamber, which is a standard for the completion of coke, after 1 hour has elapsed Sprayed for about 50 seconds.

As a result, it was possible to remove the furnace top deposit without polluting the surrounding environment and without affecting the coke oven operation due to the removal work. The smoke and dust generated when removing the furnace lid for the kiln removal work could be completely eliminated from those caused by the upper deposit.

[0046]

As described above, according to the present invention, it becomes possible to remove the carbon or coal attached or deposited on the upper portion of the furnace lid in the coke oven before opening the furnace lid. Moreover, since it is possible to remove it before the coke firing operation without opening the top cover of the ascending pipe, it is possible to eliminate the smoke and dust generated when the furnace lid is opened for the firing operation, which can greatly contribute to the maintenance of the surrounding environment. It is a thing.

It is possible to make a great improvement by appropriately selecting the optimum method depending on the charging characteristics, operating conditions, equipment conditions and the like.

[Brief description of drawings]

FIG. 1 is a layout view of a coke oven and a furnace lid.

FIG. 2 is a diagram illustrating a guide car side furnace lid upper structure diagram and a state in which coal and carbon are accumulated.

FIG. 3 is a diagram illustrating an extruder side furnace lid upper part structure and a state in which coal and carbon are accumulated.

4 (a) and 4 (b) are views showing an example of a compressed gas blowing nozzle inserted from the extruder side furnace lid upper leveling port.

FIG. 5 is a view showing an example in which a part of the brick structure at the upper part of the coke oven kiln opening is partially opened.

[Explanation of symbols]

1 ... Coke oven 2 ... Coke layer 3 ... Rise pipe 4 ... Guide car side furnace lid 5 ... Guide car side furnace lid brick plug 6 ... Extruder side furnace lid 7 ... Extruder side furnace lid brick plug 8 ... Extruder side furnace Lid leveling port 9 ... Ascending pipe top lid 10 ... Inert gas or oxygen-containing gas blowing nozzle (example) 11 ... Inert gas or oxygen-containing gas blowing hole (example) 12 ... Coke oven kiln port Blow compressed gas Through hole partially opened for use (example) 13 ... Furnace top deposit 14 ... Edge cut damper

Claims (3)

[Claims] 1. From the extruder side furnace lid leveling port to the deposit or deposit on the upper portion of the brick of the furnace lid between the end of dry distillation in the coke oven and the time when the kiln is discharged, with the lid of the riser pipe open. A method for removing deposits from the upper portion of the oven lid of a coke oven, characterized in that an inert gas is blown to the carbon and / or coal thus produced to scatter and remove the carbon and / or coal in the coke oven. 2. Between the end of dry distillation in the coke oven and the time when the kiln is discharged, the upper lid of the rising pipe is opened, and the upper lid of the extruder is attached to or deposits on the upper brick of the oven lid. A method for removing deposits from the upper part of a furnace lid of a coke oven, characterized in that an oxygen-containing gas is blown to the carbon and / or coal to remove the carbon and / or coal by combustion. 3. From the end of dry distillation in the coke oven to the start of the kiln, the lid of the rising pipe is closed, the edge cutting damper of the bent pipe of the rising pipe is opened, and the extruder lid flattening port is opened. Inert gas is blown to the carbon and / or coal that has adhered to or deposited on the top of the furnace lid brick, and the coke and gas that have been scattered and removed are sucked in the coke oven gas line provided in the curved pipe section of the rising pipe. Characteristic method for removing deposits on the upper part of a coke oven furnace lid.