JPH07157763A - Method for controlling oven pressure of coke oven - Google Patents

Abstract

PURPOSE:To provide a method for controlling the oven pressure of a coke oven in which the sealability with joint carbon of brick joints on the oven wall can be ensured; the coke quality can thereby be stabilized; both the thermal damage of the brick in the oven wall due to production of heat spots and the repair cost can be reduced to suppress the emission of black smoke from a combustion chamber and the leak of a carbonization gas from a sealing part of the carbonization chamber to the outside can be suppressed. CONSTITUTION:This method for controlling the oven pressure is to regulate a difference (Q1-Q2) between an internal pressure (Q1) of a carbonization chamber 11 during the carbonization and the internal pressure (Q2) of the combustion chamber 15 to 0 to +60mmAq in the former stage of the carbonization to -5 to +5mmAq in the latter stage of the carbonization in a method for controlling the oven pressure by charging raw material coal from a charging port into the carbonization chamber 11, carbonizing the raw material coal with heat from combustion chambers 15 arranged on both sides of the carbonization chamber 11 and producing coke.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling the pressure of a coke oven, and more specifically to a coke which can secure a joint sealability by carbon that has entered into a brick joint of a furnace wall that separates a carbonization chamber and a combustion chamber. The present invention relates to a furnace pressure control method.

[0002]

2. Description of the Related Art In a room-type coke oven, coking coal is produced by charging coking coal into a carbonization chamber through a charging port and subjecting the coking coal to carbonization by the heat of combustion chambers arranged on both sides of the coking chamber. ing. By the way, in the early stage of carbonization, a large amount of carbonization gas is generated by carbonization of the raw coal, and the internal pressure of the carbonization chamber becomes higher than the internal pressure of the combustion chamber. Moreover, carbon generated by carbonization adheres to the surface of the furnace wall that separates the carbonization chamber and the combustion chamber from the carbonization chamber side, and this adhered carbon grows by entering the brick joint of the furnace wall due to the high internal pressure of the carbonization chamber, The carbonization chamber and the combustion chamber are sealed. On the other hand, in the latter part of the carbonization, the amount of carbonization gas generated in the carbonization chamber decreases, and the internal pressure of the combustion chamber becomes higher than the internal pressure of the carbonization chamber, contrary to the first part of the carbonization. As a result, a minute gap is formed in the brick joint due to the difference in coefficient of thermal expansion between the brick on the furnace wall and the joint carbon, and the contact area between the joint carbon on the furnace wall and the excess oxygen contained in the internal gas of the combustion chamber. Increase, C + O ₂ → CO ₂ , 1 / 2O ₂ + CO → CO ₂ , C
The reaction of + CO ₂ → 2CO is promoted, and the joint carbon is gradually burned out.

[0003]

In the early stage of carbonization, when the internal pressure of the carbonization chamber exceeds the internal pressure of the combustion chamber by, for example, +70 mmAq or more, although the sealing property of the brick joint due to the carbon generated by carbonization becomes good, the internal pressure of the carbonization chamber is improved. However, there was a problem that the dry distillation gas leaked to the outside from the carbonization chamber sealing parts such as the furnace lid sealing part and the charging inlet sealing part on the coke pushing side and the coke discharging side, and the working environment was deteriorated. Further, in the latter stage of dry distillation, when the internal pressure of the carbonization chamber becomes lower than the internal pressure of the combustion chamber by, for example, -6 mmAq or less, the burning rate of the above-mentioned joint carbon becomes faster, the joint seal becomes insufficient, and gas leakage through the brick joint occurs. There is a risk. When such gas leakage occurs, a heat spot due to gas combustion occurs on the low pressure side, and the surrounding bricks are thermally transformed and deteriorated. As a result, the bricks must be repaired relatively frequently, and the cost of repairing the furnace wall becomes high. In addition, when the raw material coal is dry-distilled next time in this state, the dry-distilled gas in the carbonization chamber inevitably leaks to the combustion chamber side. As a result, the dry distillation of the raw coal interferes with the production of defective coke,
In the combustion chamber, since the combustion air is insufficient due to the dry distillation gas that has flowed in, incomplete combustion gas is generated, and black smoke is emitted from the chimney, which causes a problem of environmental pollution. As a conventional technique for controlling the internal pressure in the coke oven, for example, Japanese Patent Laid-Open No.
No. 177,493 discloses a "method for dry distillation of coking furnace charged coking coal", which is for a predetermined period of dry distillation while extracting dry distillation gas from an opening provided on the surface of a coking coal layer in a carbonization chamber. Internal pressure of the upper space of the carbonization chamber at + 5m
It is intended to improve the carbonization efficiency by maintaining it at or below mAq, and is not intended to secure the joint sealability by the joint carbon by controlling the internal pressure difference between the carbonization chamber and the combustion chamber, which is the object of the present invention. . The present invention has been made in view of the above circumstances, and can secure the sealability of the brick joint of the furnace wall by the joint carbon, thereby stabilizing the coke quality and reducing the heat damage of the furnace wall brick due to the generation of heat spots. With the aim of providing a coke oven furnace pressure control method capable of reducing the repair cost, suppressing the generation of black smoke from the combustion chamber, and preventing the external leakage of dry distillation gas from the coking chamber seal part. To do.

[0004]

A method according to the above-mentioned object.
The method for controlling the furnace pressure of the coke oven described above comprises charging coking coal into a carbonization chamber from a charging port, and carbonizing the coking coal by the heat of combustion chambers arranged on both sides of the carbonization chamber to produce coke. In a furnace pressure control method for a coke oven, a difference Q1-Q2 between an internal pressure Q1 of the carbonization chamber and an internal pressure Q2 of the combustion chamber during carbonization.
, Dry distillation first term 0 to +60 mmAq, dry distillation second term -5 to +5
It is configured to be mmAq.

[0005]

According to the method of operating a coke oven as set forth in claim 1, the internal pressure difference between the carbonization chamber and the combustion chamber is 0 to +60 m in the first stage of carbonization.
By setting it in the range of mAq, the carbon generated by carbonization enters the brick joint and grows, and a good joint sealing property is obtained. Moreover, the internal pressure of the carbonization chamber is not so high that the dry distillation gas leaks to the outside from the furnace lid seal part and the charging port seal part on the coke pushing side and the coke discharge side, preventing the deterioration of the working environment due to the external leakage of the dry distillation gas. In addition, since the dry distillation gas is unlikely to leak to the outside in this way, the airtightness of the carbonization chamber is maintained, the dry distillation heat amount is reduced, and the cost can be reduced. Further, in the latter stage of carbonization, by setting the internal pressure difference between the carbonization chamber and the combustion chamber to -5 to +5 mmAq, it is possible to prevent the internal pressure on the combustion chamber side from becoming excessively high and the burning rate of the joint carbon from increasing, which can be suppressed. Gas leaks from brick joints can be prevented by eliminating the lack of joint seals. Further, this gas leakage prevention makes it difficult to generate a heat spot on the low pressure side, prevents deterioration of the bricks of the furnace wall due to thermal transformation, and reduces the repair frequency of the furnace wall. Then, during the next carbonization of the coking coal, carbonization can be performed without such gas leakage, so that the carbonization gas in the carbonization chamber will not flow into the combustion chamber side, which will interfere with carbonization and generate defective coke. In addition to reducing the risk, it is possible to prevent the generation of incomplete combustion gas due to the shortage of combustion air due to the dry distillation gas flowing into the combustion chamber, and thereby to suppress the emission of black smoke from the chimney.

[0006]

Embodiments of the present invention will now be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 is a schematic configuration diagram of a furnace pressure control device for a coke oven to which a method for controlling a coke oven pressure according to an embodiment of the present invention is applied, and FIG. FIG. 2B is a graph showing the relationship between the carbonization elapsed time and the internal pressure of the coke oven as a comparative example, which is a graph showing the relationship with the internal pressure of the coke oven.

As shown in FIG. 1, a coke oven furnace pressure control apparatus 10 to which a coke oven furnace pressure control method according to an embodiment of the present invention is applied has a pressure sensor 13 at a predetermined position in a carbonization chamber 11. The carbonization chamber side pressure control system 14 attached, the combustion chamber side pressure control system 17 in which the pressure sensors 16 are attached inside the combustion chambers 15 arranged on both sides of the carbonization chamber 11, and an external device incorporating a microcomputer And a differential pressure setting device 18.

The carbonization chamber side pressure control system 14 includes a pressure sensor 1
Based on the internal pressure measurement signal of the carbonization chamber 11 sent from No. 3, the suction force of the ejector for sucking the dry distillation gas in the carbonization chamber 11 from the rising pipe 12 is adjusted to control the internal pressure Q1 of the carbonization chamber 11. Further, the combustion chamber side pressure control system 17 adjusts the burner temperature by operating the opening / closing amount of the fuel damper or the combustion gas damper based on the internal pressure measurement signal of the combustion chamber 15 sent from the pressure sensor 16 to adjust the internal pressure of the combustion chamber 15. It controls Q2.

Based on these internal pressure measurement signals, the differential pressure setter 18 determines that the internal pressure difference Q1-Q2 is 0 to +60 m during the initial period of carbonization.
It is a control unit that issues a control command to the respective pressure control systems 14 and 17 so as to be in the range of mAq and the range of -5 to +5 mmAq in the latter stage of dry distillation. The internal pressure control range during the initial period of carbonization was 0
~ +40 mmAq is preferable, and if it is less than 0 mmAq, the burning rate of the joint carbon 21 is high and joint sealing is insufficient, so that gas or atmospheric suction is generated through the brick joint 20 and a heat spot due to gas combustion occurs. When the surrounding bricks 19a deteriorate and exceed +60 mmAq, the dry distillation gas easily leaks to the outside from the coke extrusion side and the coke discharge side, such as the furnace lid seal portion and the charging port seal portion.

The internal pressure control range in the latter stage of carbonization is
5 to +5 mmAq is preferable, and if it is less than -5 mmAq, the burning rate of the joint carbon 21 is high and joint sealing is insufficient, which causes gas leakage through the brick joint 20 and causes a heat spot due to gas combustion. The surrounding bricks 19a are deteriorated, and if it exceeds +5 mmAq, the carbonization gas is liable to slightly leak to the outside from the furnace lid seal part and the charging port seal part on the coke extrusion side and the coke discharge side.
Regarding the pressure in the carbonization chamber 15, if the pressure sensor 13 is provided at the base of the rising pipe 12 instead of the average value in the carbonization chamber 15 corresponding to the pressure sensor 13, in the first half of the carbonization,
0 to +60 mmAq becomes -60 to +40 mmAq,
-5 to +5 mmAq is -6 to +4 m in the latter stage of dry distillation
It becomes mAq.

Next, a method for controlling the coke oven pressure according to the present invention using the coke oven pressure control device 10 will be described. In FIG. 1, coking coal is charged into the carbonization chamber 11 through a charging port, and the charged coking coal is carbonized by the heat of the combustion chamber 15 to produce coke. In the early part of the carbonization, a large amount of carbonization gas is generated, and the furnace wall 19 for partitioning the carbonization chamber 11 and the combustion chamber 15 is separated.
Carbon, which is a thermal decomposition component of hydrocarbons contained in the carbonization gas, adheres to the surface of the carbonization chamber 11 side. During the dry distillation, pressure sensors 13 and 16 on both chambers 11 and 15 send the internal pressure measurement signals of the chambers 11 and 15 to the differential pressure setting device 18.

In the coke oven in the first stage of carbonization, the internal pressure Q1 of the carbonization chamber 11 is higher than the internal pressure Q2 of the combustion chamber 15,
Therefore, based on the internal pressure measurement signals of the chambers 11 and 15, the pressure control systems 14 and 17 from the differential pressure setter 18 so that the internal pressure difference Q1-Q2 of the chambers 11 and 15 is in the range of 0 to +60 mmAq. A pressure control command is issued to. In this way, since the inside of the carbonization chamber 11 is maintained at a large pressure,
The carbon adhering to the furnace wall 19 is as shown by the arrow in FIG.
The joint carbon 21 formed into the brick joint 20 of No. 9 gradually grows, and the joint carbon 21 thus formed provides good joint sealing between the carbonization chamber 11 and the combustion chamber 15. Moreover, since the internal pressure of the carbonization chamber 11 is suppressed within the range of 0 to +60 mmAq, the dry distillation gas is discharged from the carbonization chamber seal parts such as the furnace lid seal part and the charging port seal part on the coke extrusion side and the coke discharge side to the outside. It is hard to leak and can prevent the deterioration of the work environment around the coke oven. In this way, since the external leakage of the dry distillation gas from the carbonization chamber seal portion and the leakage from the brick joint 20 to the combustion chamber 15 side are suppressed, the dry distillation heat amount of the combustion chamber can be reduced and the cost can be reduced.

On the other hand, in the latter part of the carbonization, the amount of carbonization gas generated in the carbonization chamber 11 decreases, and in contrast to the first part of the carbonization, the combustion chamber 15
The internal pressure Q2 becomes higher than the internal pressure Q1 of the carbonization chamber 11. As a result, a minute gap is formed between the brick 19a of the furnace wall 19 and the joint carbon 21 due to the difference in the coefficient of thermal expansion, and the external exposed area of the joint carbon 21 of the furnace wall 19 increases, and therefore the joint carbon 21 and the combustion carbon 21 burn. The contact area with excess oxygen contained in the internal gas of the chamber 15 increases, and the joint carbon 21 is burned from the combustion chamber 15 side by the combustion reaction shown in the column of the prior art.

At this time, the internal pressure difference Q1-Q2 between the two chambers 11 and 15 is -5 to +5 m based on the command from the differential pressure setting device 18.
Each pressure control system 1 should be in the range of mAq.
4 and 17 are controlled. As a result, joint carbon 2
The burning rate of 1 is slowed down to a speed at which a necessary and sufficient amount of joint carbon 21 can be secured at the end of carbonization, and gas leakage from brick joint 20 can be prevented. In the conventional means, the air inside the combustion chamber 15 passes through the seal gap of the brick joint 20 and is transmitted to the inside of the low-pressure side carbonization chamber 11, so that a heat spot is easily generated, but in the present means, gas leakage from the brick joint 20 occurs. Brick 1
It is possible to prevent deterioration of 9a due to thermal transformation, reduce the frequency of repairing the furnace wall 19, and thus extend the life of the furnace.

Further, at the next dry distillation of the raw coal, the good sealing property of the brick joint 20 is secured as described above, so that the dry distillation gas in the carbonization chamber 11 does not flow into the combustion chamber 15 side. As a result, the generation of defective coke due to insufficient carbonization can be reduced, and the combustion chamber 1
It is possible to prevent the generation of incomplete combustion gas due to the shortage of combustion air due to the dry distillation gas that has flowed into the chamber 5, and to suppress the black smoke from the chimney of the combustion chamber 15 and pollute the environment. Moreover, the present means can be applied to any existing type of coke oven by attaching the oven pressure control device 10 of the coke oven.

Next, the coke oven furnace pressure control device 10 shown in FIG. 1 was used in the carbonization chamber 11 having a charging coal amount of about 30 T / ch to perform a coke oven furnace pressure control experiment to carbonize the raw coal. The pressure change between the internal pressure Q1 of the carbonization chamber 11 and the internal pressure Q2 of the combustion chamber 15 with the passage of time was examined. The graph of FIG. 2A shows the furnace pressure control of the coke oven of the example, and the graph of FIG. 2B shows the furnace pressure control of the coke oven of the comparative example, and the experimental results are shown in Table 1. .

[0017]

[Table 1]

As is clear from Table 1, the joint carbon 21 remained in all the brick joints 20 of the furnace wall 19 in the embodiment, whereas most of the furnace end portion was burned in the comparative example. Excellent results such as gas leakage and loss of dry distillation gas recovery were eliminated, and the amount of black smoke discharged from the combustion chamber 15 was small.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and the invention is included in the present invention even if there are design changes and the like without departing from the scope of the invention. For example, in the embodiment, the mounting position of the pressure sensor on the carbonization chamber side is set to a predetermined position in the carbonization chamber, but the present invention is not limited to this and may be arranged at the base of the rising pipe, for example. In short, it may be installed anywhere as long as the internal pressure of the carbonization chamber can be measured, and the mounting position of the pressure sensor on the combustion chamber side,
Similarly, it may be provided anywhere as long as the internal pressure of the combustion chamber can be measured. Further, the pressure control system between the carbonization chamber and the combustion chamber is
The control system is not limited to that of the embodiment, and may be any control system as long as it can control the pressure of both chambers.

[0020]

As described above, in the method for controlling the coke oven pressure according to the first aspect of the present invention, the difference Q1-Q2 between the internal pressure Q1 of the carbonization chamber and the internal pressure Q2 of the combustion chamber in the first stage of carbonization is +0 to +60 mm.
Since it was limited to the range of Aq, the inside of the carbonization chamber was maintained at a relatively large pressure, and the carbon adhering to the furnace wall entered the brick joint and gradually grew, and the joint carbon formed formed the carbonization chamber and the combustion chamber. A good joint sealing property can be obtained.
Moreover, since the internal pressure of the carbonization chamber is suppressed within the range of 0 to +60 mmAq, it is difficult for the carbonization chamber seal portion to leak to the outside, and the risk of dry distillation gas leaking to the outside and deteriorating the working environment around the coke oven can be reduced, Moreover, in this way, external leakage of carbonization gas from the carbonization chamber seal part and leakage from the brick joint to the combustion chamber side are prevented, so the recovery loss of carbonization gas is suppressed and the amount of carbonization heat of the combustion chamber is reduced. Therefore, cost reduction can be achieved. On the other hand, the internal pressure difference Q1
Since -Q2 is limited to the range of -5 to +5 mmAq, the internal pressure on the combustion chamber side is prevented from becoming too large or too small, and the burnout rate of the joint carbon secures the necessary and sufficient amount of joint carbon at the end of carbonization. The speed is set as high as possible to prevent gas leakage from brick joints, to eliminate the heat spots generated on the low pressure side to prevent deterioration due to thermal transformation of bricks, reduce the frequency of repairing furnace walls and extend furnace life. be able to. Moreover, at the next carbonization of the coking coal, the good sealing property of the brick joint is ensured in this way, so the carbonization gas in the carbonization chamber will not flow into the combustion chamber side, which may cause insufficient carbonization. The generation of defective coke can be reduced and the generation of incomplete combustion gas due to the shortage of combustion air due to the dry distillation gas flowing into the combustion chamber is prevented, and black smoke is suppressed from exiting the chimney of the combustion chamber. Then, environmental pollution can be prevented. In addition, this method of controlling the coke oven pressure is applicable to any existing type coke oven.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a coke oven furnace pressure control apparatus to which a coke oven furnace pressure control method according to an embodiment of the present invention is applied.

FIG. 2 (a) is a graph showing the relationship between the elapsed time of carbonization of this means and the internal pressure of the coke oven. (B) It is a graph which shows the relationship between the carbonization elapsed time of the conventional means and the internal pressure of a coke oven.

[Explanation of Codes] 10 Coke oven furnace pressure control device 11 Coking chamber 12 Upcomer pipe 13 Pressure sensor 14 Coking chamber side pressure control system 15 Combustion chamber 16 Pressure sensor 17 Combustion chamber side pressure control system 18 Differential pressure setting device 19 Furnace wall 19a Brick 20 Brick joint 21 Joint carbon Q1 Internal pressure of carbonization chamber Q2 Internal pressure of combustion chamber

Claims (1)

[Claims] 1. Charging coal into a carbonization chamber from a charging port,
In a furnace pressure control method of a coke oven for dry-distilling the raw coal by heat of combustion chambers arranged on both sides of the carbonization chamber to produce coke, an internal pressure Q1 of the carbonization chamber and an internal pressure Q2 of the combustion chamber during carbonization.
And a difference Q1-Q2 between 0 and +60 mmAq in the first stage of carbonization and -5 to +5 mmAq in the latter stage of carbonization.