Coke dry quenching equipment and sloping flue part structure thereof

Abstract

The present disclosure pertains to: coke dry quenching equipment capable of accelerating discharge of red heated coke from a sloping flue part; and a sloping flue part structure thereof.　The coke dry quenching equipment comprises a cooling tower provided with a pre-chamber, a cooling chamber, an annular duct, and a sloping flue part. The sloping flue part includes: an annular wall which extends upward from an upper end portion of the cooling chamber in a manner of surrounding a lower end portion of the preliminary chamber from the outside; and a plurality of support walls which extend in the radial direction of the cooling chamber between the lower end portion of the preliminary chamber, and the upper end portion of the cooling chamber and the annular wall, and which are disposed in a state of being arranged along the circumferential direction of the cooling chamber. The inner circumferential surface of the annular wall includes an inclined surface which spreads outward radially toward the top of the cooling chamber. In a vertical cross-section that includes one support wall among the plurality of support walls, a first intersection part where the inner circumferential surface of the cooling chamber and the inclined surface intersect is located above a second intersection part where the lower end of the one support wall and the inner circumferential surface of the cooling chamber intersect.

Description

Coke dry quenching equipment and its sloping flue structure

[0001] The present disclosure relates to a coke dry quenching system and a sloping flue section structure thereof.

[0002] Patent Document 1 discloses a coke dry quenching (CDQ) system that quenches red-hot coke removed from a coke oven with a cooling gas (e.g., an inert gas) and generates power by utilizing the heat of the cooling gas after heat exchange with the red-hot coke. The coke dry quenching system includes a cooling tower including a preliminary chamber for storing red-hot coke and a cooling chamber disposed below the preliminary chamber. The preliminary chamber and the cooling chamber have a vertically extending cylindrical shape. A supply section is provided at the bottom of the cooling chamber to supply cooling gas for dry-cooling the red-hot coke. A plurality of exhaust ports (sloping flues) are provided at the top of the cooling chamber for exhausting the cooling gas, which has been heated by heat exchange with the red-hot coke, to the outside of the cooling tower. The exhaust ports are arranged at predetermined intervals around the circumferential direction of the cooling chamber. Each exhaust port includes an inclined surface (sloping surface) that widens radially outward as it extends upward. Between each exhaust port, a support wall is provided that connects the lower part of the pre-chamber with the inner circumferential surface of the upper part of the cooling chamber in order to support the annular wall of the pre-chamber.

[0003] Japanese Utility Model Publication No. 62-034975

[0004] During operation of the coke dry quenching system, the red-hot coke cooled in the cooling tower is discharged to the outside from the bottom of the cooling tower. In response to this discharge, the red-hot coke stored in the preliminary chamber flows down into the cooling chamber. At this time, the red-hot coke stored in the preliminary chamber also flows into the exhaust port. Meanwhile, as described above, cooling gas is exhausted from the exhaust port toward the outside of the cooling tower. Therefore, the red-hot coke is blown up by the cooling gas and accumulates in the exhaust port, which may cause the exhaust port to become clogged with the red-hot coke. In this case, it tends to be difficult to adjust the flow rate of the cooling gas flowing through the cooling chamber to a level appropriate for the amount of red-hot coke being processed.

[0005] Therefore, in Patent Document 1, an inclined surface is adopted at the exhaust port, in which back surfaces with different inclination angles are connected. In this case, the amount of red-hot coke flowing out of the exhaust port is greater than the amount of red-hot coke flowing into the exhaust port, and clogging of the exhaust port is suppressed. Furthermore, since clogging of the exhaust port is suppressed while maintaining the diameter difference between the pre-chamber and the cooling chamber without increasing the diameter difference, it is said that an increase in cost due to the need to expand the pre-chamber in the height direction to compensate for the smaller diameter of the pre-chamber and the length of the support wall is suppressed.

[0006] However, when an inclined surface with connected back surfaces having different inclination angles is used at the exhaust port as in Patent Document 1, the size of the exhaust port increases and the area of ​​the inclined surface also increases. As a result, not only does the amount of red-hot coke flowing from the pre-chamber into the exhaust port increase, but the frictional resistance that the red-hot coke experiences from the inclined surface also increases. Therefore, the exhaust port structure of Patent Document 1 cannot actually sufficiently eliminate the retention of red-hot coke at the exhaust port.

[0007] Therefore, the present disclosure describes a coke dry quenching system and its sloping flue section structure that can promote the discharge of red-hot coke from the sloping flue section.

[0008] An example of a coke dry quenching system includes a cooling tower including a cylindrical pre-chamber, a cylindrical cooling chamber disposed below the pre-chamber, an annular duct formed around the pre-chamber, and a sloping flue. The sloping flue includes an annular wall extending upward from the upper end of the cooling chamber to surround the lower end of the pre-chamber from the outside, a plurality of support walls formed of firebricks and extending radially of the cooling chamber between the lower end of the pre-chamber, the upper end of the cooling chamber, and the annular wall, and arranged in a line along the circumferential direction of the cooling chamber, and a plurality of exhaust flow passages defined by adjacent support walls in the circumferential direction, the lower end of the pre-chamber, and the annular wall, and configured to fluidly connect the cooling chamber and the annular duct. The inner circumferential surface of the annular wall includes an inclined surface that widens radially outward of the cooling chamber as it extends upward. In a vertical cross section including one of the multiple support walls, a first intersection where the inclined surface intersects with the inner surface of the cooling chamber is located above a second intersection where the lower end of the one support wall intersects with the inner surface of the cooling chamber.

[0009] According to the coke dry quenching equipment and its sloping flue section structure of the present disclosure, it is possible to promote the discharge of red-hot coke from the sloping flue section.

[0010] Fig. 1 is a schematic diagram showing an example of a coke dry quenching system. Fig. 2 is an enlarged perspective view of part II in Fig. 1, showing the vicinity of the sloping flue section as viewed from inside the cooling tower. Fig. 3 is a cross-sectional view taken along line III-III in Fig. 2. Fig. 4 is a diagram for explaining the mechanism by which red-hot coke clogs the exhaust flow path in a conventional coke dry quenching system.

[0011] In the following description, the same elements or elements having the same functions will be designated by the same reference numerals, and redundant explanations will be omitted. Note that in this specification, when referring to the top, bottom, right, and left of a drawing, the directions of the reference numerals in the drawing will be used as the reference.

[0012] [Coke Dry Quenching Equipment] First, the configuration of a coke dry quenching equipment 100 will be described with reference to Fig. 1. The coke dry quenching equipment 100 is configured to cool red-hot coke C1 introduced from a coke oven (not shown) with a cooling gas G1 to obtain quenched (cooled) coke C2. The coke dry quenching equipment 100 includes a cooling tower 101 (chamber), a dust collector 102, a boiler 103, a dust collector 104, a blower 105, a feedwater preheater 106, and a rotary valve 107.

[0013] The cooling tower 101 is a container that contains the red-hot coke C1 and the coke C2. The cooling tower 101 is made of firebricks. In the cooling tower 101, the red-hot coke C1 and the coke C2 flow from top to bottom, and a cooling gas G1 for cooling the red-hot coke C1 flows from bottom to top. The cooling gas G1 may be, for example, an inert gas containing nitrogen gas as a main component. The cooling gas G1 may contain unburned components such as carbon monoxide and hydrogen.

[0014] The cooling tower 101 includes a pre-chamber 101A, a cooling chamber 101B, an annular duct 101C, and a sloping flue section 1.

[0015] The pre-chamber 101A is configured to temporarily store the red-hot coke C1. The pre-chamber 101A has a cylindrical (e.g., substantially cylindrical) shape. An inlet 101a1 is provided at the top of the pre-chamber 101A. The bottom of the pre-chamber 101A is open downward (toward the cooling chamber 101B). When viewed from the top-bottom direction, a lower end 101a2 of the pre-chamber 101A may partially overlap an upper end 101b of the cooling chamber 101B, or may be located inside the upper end 101b of the cooling chamber 101B.

[0016] The red-hot coke C1 is transported to the top of the cooling tower 101 by a transport device 200 and is then poured into the preparatory chamber 101A through an inlet 101a1 provided at the top of the preparatory chamber 101A. The transport device 200 includes a crane 201 and a transport belt 202. The crane 201 is configured to be able to move up and down while holding a bucket 203 that contains the red-hot coke C1. The transport belt 202 is configured to be able to transport the crane 201, which is holding the bucket 203, in the horizontal direction.

[0017] The cooling chamber 101B (cooling chamber) is disposed below the spare chamber 101A. The cooling chamber 101B has a cylindrical shape (e.g., a substantially cylindrical shape). The upper portion of the spare chamber 101A is open upward (toward the spare chamber 101A). When viewed from the top-bottom direction, the upper end portion 101b of the cooling chamber 101B may partially overlap with the spare chamber 101A or may be located outside the spare chamber 101A. In other words, when viewed from the top-bottom direction, the inner peripheral surface of the cooling chamber 101B may be located outside the inner peripheral surface of the spare chamber 101A or outside the outer peripheral surface of the spare chamber 101A.

[0018] A pipe D6 (described later) is connected to the lower part of the cooling chamber 101B. The cooling chamber 101B is configured to cool the red-hot coke C1 flowing down from the preliminary chamber 101A by a cooling gas G1 that is supplied to the lower part of the cooling chamber 101B via the pipe D6 and rises within the cooling chamber 101B.

[0019] The cooling gas G1 is heated to about 800°C by heat exchange with the red-hot coke C1 in the cooling chamber 101B, and becomes a high-temperature gas G2. Meanwhile, the red-hot coke C1 is cooled to about 200°C by heat exchange with the cooling gas G1, and becomes a coke C2.

[0020] The annular duct 101C is formed around the auxiliary chamber 101A so as to surround the outer periphery of the auxiliary chamber 101A. The annular duct 101C has a tubular shape (e.g., a substantially cylindrical shape). An outlet portion 101c is provided in a part of the side wall of the annular duct 101C.

[0021] The sloping flue section 1 is disposed between the upper end of the cooling chamber 101B and the lower end of the preparatory chamber 101A and the lower end of the annular duct 101C so as to fluidly connect the cooling chamber 101B and the annular duct 101C. After heat exchange with the red-hot coke C1 in the cooling chamber 101B, the high-temperature gas G2 is discharged to the outside of the cooling tower 101 through the sloping flue section 1, the annular duct 101C, and the outlet section 101c. The detailed configuration of the sloping flue section 1 (sloping flue section structure) will be described later.

[0022] The dust collector 102 is configured to collect at least a portion of the coke dust entrained in the high-temperature gas G2. An inlet side (upstream side) of the dust collector 102 is connected to the outlet portion 101c of the annular duct 101C via a pipe D1.

[0023] The boiler 103 is configured to recover thermal energy from the high-temperature gas G2 that has passed through the dust collector 102. The inlet side (upper part) of the boiler 103 is connected to the outlet side (downstream side) of the dust collector 102 via a pipe D2. The boiler 103 may be configured to generate steam using the recovered thermal energy. The generated steam may be used in power generation facilities, steel mills, chemical plants, etc. The high-temperature gas G2 is cooled by heat recovery in the boiler 103 and becomes low-temperature gas G3.

[0024] The dust collector 104 is configured to recover at least a portion of the coke dust entrained in the low-temperature gas G3 after heat exchange in the boiler 103. The inlet side (upstream side) of the dust collector 104 is connected to the outlet side (lower part) of the boiler 103 via a pipe D3.

[0025] The blower 105 (supply unit) is configured to send the low-temperature gas G3 that has passed through the dust collector 104 toward the cooling chamber 101B. The inlet side (upstream side) of the blower 105 is connected to the downstream side (outlet side) of the dust collector 104 via a pipe D4.

[0026] The feedwater preheater 106 (supply section) is configured to exchange heat between the low-temperature gas G3 delivered by the blower 105 and water (hot water) to cool it to approximately 130°C, and supply the cooled cooling gas G1 to the cooling chamber 101B. The cooling gas G1 supplied to the cooling chamber 101B exchanges heat with the red-hot coke C1, circulates within the coke dry quenching equipment 100, and is then supplied to the cooling chamber 101B again as the cooling gas G1. Therefore, the cooling gas G1 also serves as a circulating gas.

[0027] The inlet side (upstream side) of feedwater preheater 106 is connected to the outlet side (downstream side) of blower 105 via pipe D5 (supply section). The outlet side (downstream side) of feedwater preheater 106 is connected to the lower part of cooling chamber 101B via pipe D6 (supply section). In other words, blower 105, feedwater preheater 106, and pipes D5 and D6 constitute a supply section that supplies cooling gas G to cooling chamber 101B.

[0028] The rotary valve 107 is provided at the bottom of the cooling tower 101. The coke C2 cooled in the cooling chamber 101B is discharged to the outside of the coke dry quenching equipment 100 through the rotary valve 107. At this time, the cooling gas G1 (containing unburned components such as carbon monoxide and hydrogen) in the cooling chamber 101B also flows toward the rotary valve 107. The rotary valve 107 is configured to discharge the coke C2 to the outside of the coke dry quenching equipment 100 while minimizing the outflow of the cooling gas G1 downstream.

[0029] 2 and 3, the configuration of the sloping flue section 1 will be described. The sloping flue section 1 is made of firebricks. The sloping flue section 1 includes an annular wall 10 and a plurality of support walls 20.

[0030] 2 and 3, the annular wall 10 extends upward from the upper end 101b of the cooling chamber 101B so as to surround the lower end 101a2 of the preliminary chamber 101A from the outside. Therefore, when viewed from the radial direction of the annular wall 10, the annular wall 10 partially overlaps with the lower end 101a2 of the preliminary chamber 101A.

[0031] The inner peripheral surface of the annular wall 10 includes an inclined surface S1. The inclined surface S1 extends upward from the upper end 101b of the cooling chamber 101B, widening radially outward as it extends upward. That is, when the annular wall 10 is viewed alone, excluding the sloping flue portion 1 and the multiple support walls 20, the inclined surface S1 as a whole forms a truncated cone surface. As illustrated in FIG. 3 , the inclination angle α of the inclined surface S1 (the angle of the inclined surface S1 with respect to the horizontal plane H) may be, for example, approximately 50° to 70°. As illustrated in FIG. 3 , when viewed in a vertical cross section including one of the multiple support walls 20, the portion where the inclined surface S1 intersects with the inner peripheral surface of the upper end 101b of the cooling chamber 101B is referred to herein as the "intersection P1" (first intersection). The intersection P1 is located above the intersection P2, which will be described later.

[0032] The support walls 20 are arranged between the lower end 101a2 of the preliminary chamber 101A and the upper end 101b and annular wall 10 of the cooling chamber 101B. Each of the support walls 20 extends radially of the cooling chamber 101B (annular wall 10). The support walls 20 are arranged at predetermined intervals along the circumferential direction of the cooling chamber 101B (annular wall 10). Therefore, an exhaust flow path 30 is formed by a space defined by a pair of support walls 20 adjacent to each other in the circumferential direction, the lower end 101a2 of the preliminary chamber 101A, and the annular wall 10. The exhaust flow path 30 fluidly connects the cooling chamber 101B and the annular duct 101C, and is a flow path through which the high-temperature gas G2 after heat exchange flows from the cooling chamber 101B to the annular duct 101C.

[0033] 2 and 3, the support wall 20 includes an upper portion 21, a middle portion 22, and a lower portion 23. When viewed from the radial direction of the annular wall 10, the upper portion 21 does not overlap with the upper end portion 101b of the cooling chamber 101B, but overlaps with the lower end portion 101a2 of the preliminary chamber 101A and the annular wall 10.

[0034] When viewed in the radial direction of the annular wall 10, the intermediate portion 22 does not overlap with the lower end portion 101a2 of the preliminary chamber 101A or the upper end portion 101b of the cooling chamber 101B, but overlaps with the annular wall 10. When viewed in the circumferential direction of the annular wall 10, the intermediate portion 22 has a substantially trapezoidal shape (see FIG. 3). As illustrated in FIG. 3, when viewed in a vertical cross section including one of the multiple support walls 20, the portion where the inner circumferential surface of the support wall 20 (intermediate portion 22) intersects with the lower end surface of the lower end portion 101a2 of the preliminary chamber 101A is referred to in this specification as an "intersection P0" (third intersection).

[0035] When viewed from a vertical cross section including one of the support walls 20, the angle θ formed by the horizontal plane H including the intersection P0 and the imaginary line L1 passing through the intersections P0 and P1 may be, for example, 70° or less, 60° or less, or 50° or less. The angle θ may be, for example, greater than 0°, 40° or more, or 50° or more. The angle θ may be greater than the angle of repose β of the red-hot coke C1 in the exhaust passage 30, may be equal to the angle of repose β, or may be smaller than the angle of repose β. That is, the imaginary line L1 may extend below the repose surface S2 of the red-hot coke C1, may extend within the repose surface S2, or may extend above the repose surface S2. The angle of repose β may be, for example, approximately 35°.

[0036] When viewed from the radial direction of the annular wall 10, the lower portion 23 does not overlap the lower end portion 101a2 of the preliminary chamber 101A or the annular wall 10, but overlaps the upper end portion 101b of the cooling chamber 101B. When viewed from the circumferential direction of the annular wall 10, the lower portion 23 has a substantially triangular shape (see FIG. 3). As illustrated in FIG. 3, when viewed in a vertical cross section including one of the multiple support walls 20, the portion where the lower end of the support wall 20 (lower portion 23) intersects with the inner circumferential surface of the upper end portion 101b of the cooling chamber 101B is referred to in this specification as an "intersection P2" (second intersection).

[0037] When viewed in a vertical cross section including one of the support walls 20, the angle γ between the horizontal plane H including the intersection P0 and the imaginary line L2 (the inner peripheral surface of the one support wall 20) passing through the intersections P0 and P2 may be, for example, approximately 60° to 80°. The support walls 20 are constructed by stacking firebricks. The preliminary chamber 101A is supported by the multiple support walls 20. Therefore, a compressive load from the preliminary chamber 101A acts on each support wall 20. Therefore, there is a limit to how small the angle γ can be to support the preliminary chamber 101A while suppressing damage to the support walls 20 due to the compressive load. As a result, the lower portion 23 of the support wall 20 may extend below the intersection P1.

[0038] [Operation] FIG. 4 shows the configuration of a conventional sloping flue section 1 in which the intersection P1 and the intersection P2 coincide (see also the annular wall 10 and the upper end 101b of the cooling chamber 101B depicted by the two-dot chain line in FIG. 3). As illustrated in FIG. 4(a), high-temperature coke C1 flowing into the exhaust passage 30 accumulates in the exhaust passage 30 at an angle of repose β. Within the exhaust passage 30, high-temperature gas G2 flows from the cooling chamber 101B toward the annular duct 101C. As illustrated in FIGS. 4(a) and 4(b), the high-temperature gas G2 tends to flow near the lower end 101a2 of the pre-chamber 101A, where pressure loss is small (the amount of red-hot coke C1 accumulated is small). Therefore, as illustrated in FIG. 4(b), the red-hot coke C1 accumulated inside the exhaust passage 30 is blown out of the exhaust passage 30 by the relatively high-speed high-temperature gas G2. During operation of the coke dry quenching system 100, as illustrated in Fig. 4(c), the red-hot coke C1 is blown away by the high-temperature gas G2, causing the red-hot coke C1 to remain in the exhaust passage 30. As a result, as illustrated in Fig. 4(d), there is a concern that the red-hot coke C1 may clog the exhaust passage 30. Therefore, in order to avoid this clogging phenomenon, the flow rate of the cooling gas G1 has been limited.

[0039] However, in the above example, the intersection P1 is located higher than the intersection P2. In this case, compared to a conventional sloping flue section 1 in which the intersections P1 and P2 are aligned, the inner circumferential surface of the cooling chamber 101B is located outward. Therefore, the length of the inclined surface S1 of the annular wall 10 extending upward from the upper end 101b of the cooling chamber 101B is relatively short. Therefore, even when the red-hot coke C1 flows into the exhaust passage 30, the contact area between the red-hot coke C1 and the inclined surface S1 is small, and the frictional resistance that the red-hot coke C1 experiences from the inclined surface S1 is reduced. As a result, the red-hot coke C1 is more likely to flow downward from the exhaust passage 30, which facilitates the discharge of the red-hot coke C1 from the sloping flue section 1. In this way, blockage of the exhaust passage 30 by the red-hot coke C1 is suppressed, thereby increasing the flow rate of the cooling gas G1 supplied to the cooling chamber 101B. In addition, since the inner peripheral surface of the cooling chamber 101B is located relatively outward, the capacity of the cooling chamber 101B is relatively large. Therefore, by increasing the flow rate of the cooling gas G1 and the capacity of the cooling chamber 101B, it is possible to significantly improve the processing capacity (cooling capacity) of the red-hot coke C1 in the cooling chamber 101B.

[0040] According to the above example, when viewed in a vertical cross section including one of the support walls 20, the angle θ between the horizontal plane H and the imaginary line L1 can be set to 70° or less. In this case, the angle θ approaches the angle of repose β of the red-hot coke C1 or becomes smaller than the angle of repose β. This further reduces the contact area between the red-hot coke C1 and the inclined surface S1. This further facilitates the discharge of the red-hot coke C1 from the sloping flue section 1.

[0041] [Modifications] The disclosure in this specification should be considered to be illustrative in all respects and not restrictive. Various omissions, substitutions, modifications, etc. may be made to the above examples without departing from the scope and spirit of the claims.

[0042] [Other Examples] Example 1. One example of a coke dry quenching system includes a cooling tower including a cylindrical pre-chamber, a cylindrical cooling chamber disposed below the pre-chamber, an annular duct formed around the pre-chamber, and a sloping flue section. The sloping flue section includes an annular wall extending upward from the upper end of the cooling chamber so as to surround the lower end of the pre-chamber from the outside, a plurality of support walls formed of firebricks and extending radially of the cooling chamber between the lower end of the pre-chamber, the upper end of the cooling chamber, and the annular wall, and arranged in a line along the circumferential direction of the cooling chamber, and a plurality of exhaust flow passages defined by adjacent support walls in the circumferential direction, the lower end of the pre-chamber, and the annular wall, and configured to fluidly connect the cooling chamber and the annular duct. The inner circumferential surface of the annular wall includes an inclined surface that widens radially outward of the cooling chamber as it extends upward. In a vertical cross section including one of the multiple support walls, a first intersection where the inclined surface intersects with the inner surface of the cooling chamber is located above a second intersection where the lower end of the one support wall intersects with the inner surface of the cooling chamber.

[0043] When the first intersection is located above the second intersection, the inner circumferential surface of the cooling chamber is located outward compared to a configuration in which the first and second intersections are approximately aligned. Therefore, the length of the inclined surface of the annular wall extending upward from the upper end of the cooling chamber is relatively short. Therefore, even when the red-hot coke flows into the exhaust passage, the contact area between the red-hot coke and the inclined surface is small, reducing the frictional resistance the red-hot coke experiences from the inclined surface. As a result, the red-hot coke is more likely to flow downward from the exhaust passage, thereby facilitating the discharge of the red-hot coke from the sloping flue. In this way, blockage of the exhaust passage by the red-hot coke is suppressed, thereby increasing the flow rate of the cooling gas supplied to the cooling chamber. In addition, since the inner circumferential surface of the cooling chamber is located relatively outward, the capacity of the cooling chamber is relatively large. Therefore, the increased flow rate of the cooling gas and the increased capacity of the cooling chamber significantly improve the red-hot coke processing capacity (cooling capacity) of the cooling chamber.

[0044] Example 2 In the coke dry quenching system of Example 1, in a vertical cross section including one of the support walls, the angle θ formed by a horizontal plane including a third intersection where the lower end of the preparatory chamber intersects with the inner circumferential surface of the one support wall and a line passing through the second intersection and the third intersection may be 70° or less. In this case, the angle θ approaches the angle of repose of the red-hot coke or becomes smaller than the angle of repose. This further reduces the contact area between the red-hot coke and the inclined surface. This further facilitates the discharge of the red-hot coke from the sloping flue section.

[0045] Example 3. An example of a sloping flue structure is a sloping flue structure for a coke dry quenching system equipped with a cooling tower including a preparatory chamber, a cooling chamber disposed below the preparatory chamber, and an annular duct formed around the preparatory chamber. The example of the sloping flue structure includes an annular wall extending upward from the upper end of the cooling chamber so as to surround the lower end of the preparatory chamber from the outside, a plurality of support walls formed of firebricks, extending radially of the cooling chamber between the lower end of the preparatory chamber, the upper end of the cooling chamber, and the annular wall, and arranged in a line along the circumferential direction of the cooling chamber, and a plurality of exhaust flow paths defined by circumferentially adjacent support walls among the plurality of support walls, the lower end of the preparatory chamber, and the annular wall, and configured to fluidly connect the cooling chamber and the annular duct. The inner circumferential surface of the annular wall includes an inclined surface that widens outward as it extends upward. In a vertical cross section including one of the plurality of support walls, a first intersection where the inclined surface intersects with the inner peripheral surface of the cooling chamber is located above a second intersection where the lower end of the one support wall intersects with the inner peripheral surface of the cooling chamber. In this case, the same effects as those of the coke dry quenching system of Example 1 can be obtained.

[0046] Example 4 In the sloping flue section structure of Example 3, in a vertical cross section including one of the plurality of support walls, the angle θ formed by a horizontal plane including a third intersection where the lower end of the preliminary chamber intersects with the inner peripheral surface of the one support wall and a line passing through the second intersection and the third intersection may be 70° or less. In this case, the same effects as those of the coke dry quenching system of Example 2 can be obtained.

[0047] 1...sloping flue section (sloping flue section structure), 10...annular wall, 20...support wall, 30...exhaust flow path, 100...coke dry quenching equipment, 101...cooling tower, 101A...preparatory chamber, 101B...cooling chamber, 101C...annular duct, L1...imaginary straight line, P0...intersection (third intersection), P1...intersection (first intersection), P2...intersection (second intersection), S1...inclined surface.

Claims

1. A cooling tower comprising: a cylindrical pre-chamber; a cylindrical cooling chamber located below the pre-chamber; an annular duct formed around the pre-chamber; and a sloping flue section, wherein the sloping flue section comprises: an annular wall extending upward from the upper end of the cooling chamber so as to surround the lower end of the pre-chamber from the outside; a plurality of support walls made of firebricks extending in the radial direction of the cooling chamber between the lower end of the pre-chamber and the upper end of the cooling chamber and the annular wall, and arranged in a line along the circumferential direction of the cooling chamber; and a plurality of exhaust flow passages defined by adjacent support walls in the circumferential direction among the plurality of support walls, the lower end of the pre-chamber, and the annular wall, and configured to fluidly connect the cooling chamber and the annular duct, wherein the inner circumferential surface of the annular wall includes an inclined surface that widens radially outward of the cooling chamber as it extends upward, A coke dry quenching system, wherein in a vertical cross section including one of the plurality of support walls, a first intersection where the inclined surface intersects with the inner surface of the cooling chamber is located above a second intersection where the lower end of the one support wall intersects with the inner surface of the cooling chamber.

2. A coke dry quenching system as described in claim 1, wherein in a vertical cross section including one of the plurality of support walls, the angle θ formed by a horizontal plane including a third intersection where the lower end of the auxiliary chamber and the inner surface of the one support wall intersect, and an imaginary line passing through the second intersection and the third intersection, is 70° or less.

3. A sloping flue section structure for a coke dry quenching system equipped with a cooling tower including a preparatory chamber, a cooling chamber arranged below the preparatory chamber, and an annular duct formed around the preparatory chamber, comprising: an annular wall extending upward from the upper end of the cooling chamber so as to surround the lower end of the preparatory chamber from the outside; a plurality of support walls made of firebricks extending in the radial direction of the cooling chamber between the lower end of the preparatory chamber and the upper end of the cooling chamber and the annular wall, and arranged in a row along the circumferential direction of the cooling chamber; and a plurality of exhaust flow passages defined by adjacent support walls in the circumferential direction among the plurality of support walls, the lower end of the preparatory chamber, and the annular wall, and configured to fluidly connect the cooling chamber and the annular duct, wherein the inner peripheral surface of the annular wall includes an inclined surface that widens outward as it extends upward, A sloping flue section structure of a coke dry quenching system, wherein in a vertical cross section including one of the plurality of support walls, a first intersection where the inclined surface and the inner surface of the cooling chamber intersect is located higher than a second intersection where the lower end of the one support wall and the inner surface of the cooling chamber intersect.

4. A sloping flue section structure as set forth in claim 3, wherein in a vertical cross section including one of the plurality of support walls, the angle θ formed by a horizontal plane including a third intersection where the lower end of the auxiliary chamber and the inner peripheral surface of the one support wall intersect, and an imaginary line passing through the second intersection and the third intersection, is 70° or less.

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