Removal device of deposits and removal method of deposits

Abstract

To provide a removal device capable of suction of deposits and removal of deposits while breaking deposits in a combustion chamber.SOLUTION: A removal device of deposits for removing deposits deposited in a combustion chamber of a coke oven includes a pipe having a length reaching a combustion chamber bottom and an ejector forming a suction force by blow-in of a gas, wherein the ejector includes a blow-in part for blow-in of a gas, an exhaust part for exhausting a gas, and a suction part generating a suction force by blow-in of a gas, and the pipe is connected on one end side with the suction part and is provided with at least one sharp-tip protrusion on an end face of the other end side.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a deposit removal device and a deposit removal method for removing deposits accumulated in the combustion chamber of a coke oven. [Background technology]

[0002] Chamber-hearth coke ovens (hereafter referred to as "coke ovens") are used to produce coke for use in blast furnaces. A coke oven consists of combustion chambers spaced apart in the width direction of the oven and a carbonization chamber sandwiched between the combustion chambers. The ceiling of the carbonization chamber of this coke oven is provided with a row of multiple (usually 4 to 5) holes for charging. Coal, the raw material for coke, is charged into the carbonization chamber through the holes, and the heat generated by burning gas in the combustion chamber is supplied to the carbonization chamber via refractories to carbonize the coal and produce coke.

[0003] In such coke ovens, some bricks may fall off the furnace wall between the coke chamber and the combustion chamber due to aging and other factors, and accumulate inside the combustion chamber. Furthermore, when spraying thermal spray material onto the damaged area caused by the fallen bricks to repair it, the powdery thermal spray material may scatter and accumulate inside the combustion chamber. When some bricks or thermal spray material accumulate inside the combustion chamber, the temperature of the combustion chamber drops. A drop in the temperature of the combustion chamber also drops the temperature of the coke chamber, lowering the carbonization temperature of the coal and reducing coke productivity. Therefore, it is necessary to remove the deposits accumulated inside the combustion chamber before the temperature of the combustion chamber drops significantly.

[0004] Patent Document 1 discloses a deposit removal device that uses a vertical pipe section that reaches the bottom of the combustion chamber and removes deposits inside the combustion chamber using suction force generated by supplying compressed air to an ejector pipe section. According to Patent Document 1, by switching the supply destination of compressed air to the vertical pipe section or the ejector pipe section, deposits can be removed in the vertical pipe section and compressed air can be supplied to the vertical pipe section that has become hot to cool it.

[0005] Patent Document 2 discloses a suction pipe that uses the suction force of exhaust air to suck in foreign matter accumulated at the bottom of the combustion chamber and discharge it outside the combustion chamber, a crushing tool that crushes foreign matter larger than the inner diameter of the suction pipe, and an excavation tool that excavates the foreign matter. Patent Document 2 discloses that it is preferable to crush and excavate the deposits in the combustion chamber through a crushing step using a crushing tool or an excavation step using an excavation tool, and then perform the suction step using the suction pipe. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2002-155283 [Patent Document 2] Japanese Patent Application Laid-Open No. 2014-55228 Summary of the Invention [Problem to be solved by the invention]

[0007] The deposit removal device disclosed in Patent Document 1 has a problem in that it cannot remove deposits larger than the inner diameter of the vertical pipe. On the other hand, it is possible to remove large deposits by crushing and excavating them using a crushing tool and an excavating tool disclosed in Patent Document 2. However, before removing the deposits, it is necessary to lift the long crushing tool and excavating tool with a crane and transport them to the roof of the coke oven, insert them into the combustion chamber to crush the deposits, and then remove the crushing tool and excavating tool from the combustion chamber, which results in low work efficiency.

[0008] The present invention was made in consideration of the problems with the prior art, and aims to provide a deposit removal device and a deposit removal method that can suck up and remove deposits while crushing them in the combustion chamber. [Means for solving the problem]

[0009] The means for solving the above problems are as follows. [1] A deposit removal device for removing deposits accumulated in the combustion chamber of a coke oven, comprising: a pipe having a length that reaches the bottom of the combustion chamber; and an ejector that generates suction force by blowing gas into it, the ejector having an inlet section for blowing gas into it, an outlet section from which the gas is exhausted, and a suction section in which suction force is generated by blowing the gas into it; the pipe is connected to the suction section at one end, and the end face of the other end has at least one pointed protrusion formed thereon. [2] The deposit removal device described in [1] further comprises a dust collector, which collects deposits larger than the gap between the blowing section and the exhaust section, and the pipe is connected to the suction section via the dust collector. [3] The deposit removal device according to [1] or [2], wherein the ejector further has a removable lid that closes the exhaust section. [4] A method for removing deposits accumulated in the combustion chamber of a coke oven, comprising crushing the deposits with a pipe having at least one pointed protrusion formed on its end surface, while sucking and removing the deposits with the pipe. [5] The suction force for sucking the deposits is generated by blowing gas into an ejector, and the gas blown into the ejector is caused to flow through the pipe to cool the pipe. [4] The deposit removal method described in [4]. [Effects of the Invention]

[0010] The deposit removal device and method of the present invention can crush deposits accumulated in the combustion chamber while sucking and removing the deposits, thereby enabling the removal of deposits accumulated in the combustion chamber with high work efficiency. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a cross-sectional view of a deposit removal device according to this embodiment. [Figure 2] FIG. 2 is a view of the pipe as seen from the arrow A. [Figure 3]FIG. 3 is a schematic cross-sectional view of the deposit removal device showing a state in which the exhaust unit is closed by the lid unit. [Figure 4] FIG. 4 is a schematic diagram showing the state in which the deposit removal device is lifted and moved. [Figure 5] FIG. 5 is a schematic cross-sectional view of a combustion chamber showing a state in which deposits accumulated in the combustion chamber are removed using a deposit removal device. DETAILED DESCRIPTION OF THE INVENTION

[0012] The present invention will be specifically described below through embodiments of the present invention. The following embodiments are preferred examples of the present invention, and the present invention is not limited to these embodiments.

[0013] 1 is a schematic cross-sectional view of a deposit removal device 50 according to this embodiment. The deposit removal device 50 according to this embodiment is used to remove deposits accumulated in the combustion chamber of a coke oven. The deposit removal device 50 includes an ejector 10 that generates suction force by blowing gas into it, a pipe 20 that extends to the bottom of the combustion chamber, and a dust collector 30.

[0014] The ejector 10 includes a blowing section 12 for blowing gas, an exhaust section 14 for exhausting the gas, and a suction section 16 for generating a suction force by the blowing of the gas. In this embodiment, the gas is, for example, air. A flexible hose 40 connected to a gas supply source (not shown) is connected to the blowing section 12, and the gas is blown through the hose 40. The gas blown from the blowing section 12 is exhausted from the exhaust section 14, generating a suction force in the suction section 16. The configuration of the ejector 10 and the amount of gas blown from the blowing section 12 are preferably adjusted so that the suction force is generated at a wind speed of 20 m / s or more. Experiments conducted by the inventors have confirmed that a wind speed of approximately 10 m / s is required to suck in sediments crushed to a particle size of approximately 1 mm. Therefore, generating a suction force that generates a wind speed of 20 m / s or more enables the crushed sediments to be sucked and removed.

[0015] Furthermore, the suction force of the ejector 10 is preferably adjusted by adjusting the configuration of the ejector 10 and the amount of gas blown from the blowing section 12 so that the wind speed of the sucked air is 30 m / s or less. By setting the wind speed of the sucked air to 30 m / s or less, finely crushed deposits can be selectively sucked in, which can prevent clogging caused by sucking in coarse deposits and enable efficient removal of deposits.

[0016] The pipe 20 is inserted into the combustion chamber through an inspection hole provided in the ceiling of the combustion chamber, and is used to crush deposits that have accumulated in the combustion chamber and remove the crushed deposits by suction. The inspection hole provided in the ceiling of the combustion chamber has an inner diameter of 40 to 50 mm. The combustion chamber is constantly heated to about 1000°C. For this reason, it is preferable to use a steel pipe with a nominal A rating of 32A and a heat-resistant temperature of 1000°C or higher for the pipe 20. An example of a steel pipe with a heat-resistant temperature of 1000°C or higher is a stainless steel pipe (SUS310S).

[0017] One end of the pipe 20 is connected to the suction unit 16 via the dust collector 30, and the end face of the other end has a pointed protrusion 22 formed thereon. In the example shown in FIG. 1, multiple pointed protrusions 22 are formed, but it is sufficient that at least one pointed protrusion 22 is formed on the end face of the pipe. By forming the pointed protrusion 22 on the end face of the pipe 20 in this way, deposits accumulated in the combustion chamber can be crushed at the end face of the pipe 20. Note that the pointed protrusion may be a protrusion whose width narrows toward the tip, and the tip of the protrusion may be curved or flat.

[0018] Fig. 2 is a view taken along an arrow A of the pipe 20. As shown in Fig. 2, a plate-like member 24 that passes through the axial center of the pipe 20 and connects the circumferential surface of the pipe 20 may be attached by welding to the end face of the pipe 20. By attaching the plate-like member 24 to the end face of the pipe 20, the deposits can be crushed by the plate-like member 24, and the deposits can be pulverized into small pieces.

[0019] Furthermore, by providing the plate-like member 24 on the end face of the pipe 20, it is possible to prevent large deposits from being sucked into the pipe 20. This makes it possible to suppress clogging caused by sucking in large deposits, and to efficiently remove the deposits.

[0020] Referring again to Figure 1, the dust collector 30 is provided to prevent deposits sucked through the pipe 20 from clogging the gap 18 at the connection between the blowing section 12 and the exhaust section 14 of the ejector 10. A wire mesh with openings smaller than the gap 18 is provided at the connection between the dust collector 30 and the suction section 16 to collect deposits larger than the gap 18. For example, if the gap 18 between the blowing section 12 and the exhaust section 14 of the ejector 10 is 20 mm, the mesh opening of the wire mesh of the dust collector 30 is preferably 10 mm.

[0021] Furthermore, it is preferable that the cross-sectional dimension of dust collector 30 perpendicular to the axial direction of pipe 20 is three to four times the inner diameter of pipe 20. This increases the amount of deposits that can be accommodated in dust collector 30, reducing the number of times deposits need to be removed from dust collector 30 and further improving the operating efficiency of deposit removal device 50.

[0022] 3 is a cross-sectional schematic diagram of the deposit removal device 50, showing the state in which the exhaust section 14 is closed by the lid section 19. As described above, the ejector 10 preferably has a removable lid section 19 that closes the exhaust section 14. By closing the exhaust section 14 with the lid section 19, the gas blown from the blowing section 12 flows into the pipe 20 through the suction section 16. Therefore, when the pipe 20 becomes hot, closing the exhaust section 14 with the lid section 19 allows the gas to flow into the pipe 20, thereby cooling the hot pipe 20.

[0023] Next, a deposit removal method for removing deposits accumulated in a combustion chamber using the deposit removal device 50 according to this embodiment will be described. FIG. 4 is a schematic diagram showing the state in which the deposit removal device 50 is lifted and moved. The deposit removal device 50 has a long pipe 20. Therefore, as shown in FIG. 4, the deposit removal device 50 is lifted by a crane 60 and moved to the roof of a coke oven 80.

[0024] 5 is a schematic cross-sectional view of a combustion chamber 70 showing the state in which deposits 74 accumulated in the combustion chamber 70 are being removed using a deposit removal device 50. The deposit removal device 50 is moved to the roof of a coke oven 80 by a crane 60 and positioned so that the tip of the pipe 20 coincides with an inspection hole 72 provided in the ceiling of the combustion chamber 70. At this position, the deposit removal device 50 is gradually lowered by the crane 60, whereby the pipe 20 is inserted into the combustion chamber through the inspection hole 72. This state is shown in FIG. 5(a).

[0025] Once the pipe 20 is inserted into the combustion chamber 70, gas is blown in from the blowing section 12 with the exhaust section 14 open, and deposits 74 inside the combustion chamber 70 are sucked out. At this time, the operator moves the deposit removal device 50 up and down and rotates it, causing the protrusions 22 provided on the end face of the pipe 20 to excavate and crush the deposits 74 inside the combustion chamber 70. Furthermore, if a plate-like member 24 is provided on the end face, the plate-like member 24 may be used to crush and pulverize the deposits 74. This state is shown in Figure 5(b).

[0026] Because the temperature inside the combustion chamber 70 is about 1000°C, if the removal of the deposits 74 is performed for a long period of time, the pipe 20 will heat up and become hot. For this reason, it is preferable to periodically lift the deposit removal device 50 with the crane 60 until the tip of the pipe 20 is outside the combustion chamber 70, and then, with the exhaust section 14 closed with the lid section 19, blow gas into the pipe 20 from the blowing section 12 to cool the pipe 20. In this embodiment, after removing the deposits 74 for five minutes, the deposit removal device 50 is lifted with the crane 60 and the pipe 20 is cooled for three minutes. This makes it possible to avoid damage to the pipe 20 due to high temperatures. By repeatedly performing this suction, removal, and cooling, the deposits 74 inside the combustion chamber 70 can be removed.

[0027] When the inside of the combustion chamber 70 is viewed through the inspection hole 72, the deposits 74 accumulated inside the combustion chamber 70 appear red, and the bottom surface of the combustion chamber 70 appears black. For this reason, in this embodiment, the removal status of the deposits 74 is evaluated by the area ratio of the area of ​​the deposits 74 that appear red to the area of ​​the bottom surface of the combustion chamber 70 (hereinafter, this area ratio will be referred to as the "area ratio of deposits").

[0028] The area ratio of deposits 74 can be determined, for example, by visually inspecting the inside of combustion chamber 70 through inspection hole 72 while cooling pipe 20. Alternatively, the area ratio of deposits 74 can be determined by photographing the inside of combustion chamber 70 through inspection hole 72 with a color digital camera while cooling pipe 20, and analyzing the image data generated thereby.

[0029] When deposits 74 accumulate in the combustion chamber 70, the temperature of the combustion chamber 70 drops. This lowers the carbonization temperature of the coal, and reduces the productivity of the coke oven. Therefore, it is preferable to remove the deposits 74 until the dropped temperature of the combustion chamber 70 recovers to the target temperature. The inventors have confirmed that when the hearth temperature of the combustion chamber 70 drops by 150 to 200°C, removing the deposits until the area ratio of the deposits 74 is 50% will restore the hearth temperature to 100°C.

[0030] A target area ratio of deposits is determined based on these relationships and the target furnace bottom temperature of the combustion chamber 70, and removal of deposits 74 and cooling of pipe 20 are repeated until that area ratio is reached. According to the inventors' studies, it has been confirmed that the area ratio of deposits 74 can be reduced from 100% to 75% by setting the wind speed of the suction air to 25 m / s and repeating removal of deposits 74 and cooling of pipe 20 three times.

[0031] Once it is confirmed that the deposits 74 have been removed to the target area ratio, the blowing of gas into the blowing section 12 is stopped, and the deposit removal device 50 is hoisted up by the crane 60. This state is shown in Figure 5(c).

[0032] The deposit removal device 50 is hoisted by the crane 60 until the tip of the pipe 20 is outside the combustion chamber 70, and then the tip of the pipe 20 is positioned to coincide with another inspection hole 72, and the deposit removal method is repeated again. When the target area ratio is achieved in all of the inspection holes 72, the removal of deposits from the combustion chamber 70 is completed, and the deposit removal device 50 is hoisted by the crane 60 and moved from the roof of the coke oven 80, as shown in Figure 4.

[0033] As described above, in the deposit removal device 50 and deposit removal method according to this embodiment, the deposits 74 can be sucked up and removed while being crushed by the convex portion 22 provided on the end face of the pipe 20. In contrast, if the device for crushing the deposits 74 in the combustion chamber 70 and the device for sucking and removing the deposits 74 were separate devices, the device for crushing the deposits 74 in the combustion chamber 70 would also be a long device, and would therefore need to be hoisted by a crane, as with the deposit removal device 50. This would double the time required for the operations of lifting the device with the crane 60 as shown in FIG. 4 , moving it to the roof of the coke oven 80, and then lifting it again with the crane 60 and removing it from the roof of the coke oven 80, thereby significantly reducing work efficiency.

[0034] Furthermore, it is difficult to crush the deposits 74 to the target area ratio in a single crushing of the deposits 74. For this reason, the crushing device and suction device must be moved in and out of the combustion chamber 70 multiple times until the target area ratio is reached, further reducing work efficiency. In contrast, the deposit removal device 50 and deposit removal method according to this embodiment, as described above, can crush and remove the deposits 74 by suction, so that deposits accumulated in the combustion chamber can be removed with extremely high work efficiency.

[0035] Although the deposit removal device 50 according to the present embodiment has been described as including the dust collector 30, the present invention is not limited to this. For example, if the plate-like member 24 shown in FIG. 2 is provided and a configuration is adopted in which deposits 74 larger than the gap 18 at the connection between the inlet section 12 and the outlet section 14 of the ejector 10 are not sucked in, the deposit removal device 50 does not need to include the dust collector 30.

[0036] However, if a configuration is provided at the tip of the pipe 20 that prevents deposits 74 larger than the gap 18 from being sucked in, blockage by the deposits 74 is likely to occur at the tip of the pipe 20. For this reason, it is preferable to provide the dust collector 30 in the deposit removal device 50 rather than providing a configuration at the tip of the pipe 20 of the deposit removal device 50 that prevents deposits 74 larger than the gap 18 from being sucked in.

[0037] Furthermore, the suction force of the pipe 20 may be adjusted so that deposits 74 larger than the gap 18 at the connection between the blowing section 12 and the exhaust section 14 of the ejector 10 are not sucked in. In this case, too, the deposit removal device 50 does not need to have the dust collector 30.

[0038] However, because deposits 74 come in a variety of shapes, it is difficult to adjust the suction force to ensure that deposits 74 larger than the gap 18 are not sucked in. For this reason, it is preferable to provide the deposit removal device 50 with a dust collector 30 rather than adjusting the suction force of the deposit removal device 50. [Explanation of symbols]

[0039] 10 Ejector 12 Blowing section 14 Exhaust section 16 Suction part 18 Gap 19 Lid 20 Pipe 22 Convex part 24 Plate-shaped member 30 Dust Collector 40 Hose 50 Sediment removal device 60 Crane 70 Combustion chamber 72 Inspection hole 74 Sediment 80 Coke Oven

Claims

1. A deposit removal device for removing deposits accumulated in a combustion chamber of a coke oven, comprising: a pipe having a length that reaches the bottom of the combustion chamber; An ejector that generates suction force by blowing gas into it, and the ejector has a blowing section that blows in a gas, an exhaust section that exhausts the gas, and a suction section that generates a suction force by blowing the gas, The pipe is connected to the suction part at one end and has at least one pointed projection formed on the end surface of the other end.

2. Further comprising a dust collector; the dust collector collects deposits larger than the gap between the blowing section and the exhaust section; The deposit removal device according to claim 1 , wherein the pipe is connected to the suction part via the dust collector.

3. 3. The deposit removal device according to claim 1, wherein the ejector further includes a removable lid that closes the exhaust section.

4. A method for removing deposits accumulated in a combustion chamber of a coke oven, comprising: A method for removing deposits, comprising crushing the deposits with a pipe having at least one pointed protrusion formed on an end surface thereof, and removing the deposits by suction with the pipe.

5. the suction force that sucks the deposit is a suction force generated by blowing gas into an ejector, 5. The deposit removal method according to claim 4, wherein the gas blown into the ejector is caused to flow through the pipe to cool the pipe.

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