Patent Application
20120261251
The present invention relates to transportation of red-hot coke to a coke dry quenching system.
On the other hand, the empty rotary coke bucket (3) is drawn by the electric locomotive (13) to the front of a oven chamber (17) that pushes out the red-hot coke next, and prepares for receiving operation of the red-hot coke. The above-described flow is one cycle of quenching operation in which the red-hot coke out of the coke oven is quenched by the CDQ system (10). Herein, this cycle is based on that the coke is received by the rotary coke bucket (3) by a coke amount from one oven chamber, as an amount for one rotary coke bucket (3), transported by the coke bucket car (7), and charged to the top of the furnace of the CDQ system (10).
However, the size and capability of the coke oven and the CDQ system (10) generally has a wide variety. For example, as shown in a flow chart in
In contrast, in the case of the large coke oven as shown in an embodiment at the upper portion (pushing pusher one time) of the large coke oven (the middle row) of
As a solution for the above-mentioned problem, as disclosed in Japanese Unexamined Patent Application Publication No. 60-92387 and as shown in an embodiment at the lower portion (pushing pusher two times) of the large coke oven (the middle row) of
However, with the configuration disclosed in Japanese Unexamined Patent Application Publication No. 60-92387, the time for pushing per one oven chamber is increased. Accordingly, the worker-hour is increased and the operation becomes troublesome in a case where the number of coke oven chambers is large. Thus, it is difficult to attain the above subject to improve operation efficiency of the CDQ system only by the improvement in the operation method of the coke oven. In addition, in the configuration disclosed in Japanese Unexamined Patent Application Publication No. 60-92387, pushing operation is forcibly stopped during the pushing operation, the red-hot coke at 1000° C. remaining in the oven chamber may be spread around and fall, and the red-hot coke may not be received safely. Also, the next empty coke bucket car is necessary to be moved promptly to the front of the oven chamber before the red-hot coke, the pushing of which is stopped, falls. Thus, the realization may be difficult.
The CDQ system (10) is typically installed later to the coke oven which has been operated, for the purpose of exhaust heat recovering and environmental improvement. The capacity of the rotary coke bucket (3) generally corresponds to the coke amount from one oven chamber, and thus, the size of the rotary coke bucket (3) is also determined accordingly.
However, in the case of the existing small coke oven, since the width of the lateral surface of the existing coke wet quenching car is small, it may be difficult to install the coke bucket car (7) having the rotary coke bucket (3) later. Even in the case of the medium coke oven, as shown in an embodiment at the lower portion (non-rotary coke bucket (3′)) of the medium coke oven (lower row) in
As a result, the advantages of the rotary coke bucket (3) may not be attained. The operation of the CDQ system (10) may be inefficient and unstable. Due to this, the quality of coke may be unstable.
Accordingly, an object of the present invention to provide equipment and a method for red-hot coke capable of eliminating the necessity of increase in speed of the hoist (4) and a congested operation cycle of the CDQ system (10). In this configuration, as shown in the small coke oven chamber shown in
The coke bucket (3, 3′) mentioned here according to the present invention is a rotary coke bucket (3) or a non-rotary coke bucket (3′). When just referring to the coke bucket, it may include both the rotary coke bucket (3) and the non-rotary coke bucket (3′) unless otherwise specified.
In addition, another object of the present invention to provide the optimum operation for the CDQ system (10) in which the particle size segregation of coke is small. In this operation, in the case where the amount capacity of the coke bucket (3, 3′) corresponds to the coke amount from one oven chamber, if it is difficult to newly provide the rotary coke bucket (3) due to the narrow space at the existing coke oven, the newly provided non-rotary coke receiving bucket (1) (using the rails for the existing coke wet quenching car) once receives the red-hot coke, and then the coke receiving car (1) discharges the red-hot coke by a coke amount of two or more oven chambers to the coke bucket (3, 3′), which is newly provided adjacently to the rails for the existing coke wet quenching car, in accordance with its capacity, instead of that the coke bucket (3, 3′) directly receives the red-hot coke from the coke oven.
Further, still another object of the present invention is to provide compact and inexpensive equipment without increase in size of transporting equipment for red-hot coke (including the rotary coke bucket, hoist, coke bucket car, and the like). In this configuration, as shown in the large coke oven (middle row) shown in
Further object of the present invention is to provide the optimum operation for the CDQ system (10) that may attain the advantages of the rotary coke bucket (3). In this operation, as shown in the lower row representing the medium coke oven shown in
In addition, further object of the present invention is to provide equipment and a method for transporting red-hot coke without the necessity of increase in size of the hoist (4) and the reinforcement of the CDQ system (10). In this configuration, when the amount capacity of the coke bucket (3, 3′) does not correspond to the coke amount from one oven chamber, the non-rotary coke receiving car (1) having the capacity corresponding to the coke amount from one oven chamber once receives the red-hot coke, and then controls the amount of discharge in accordance with the capacity of the coke bucket (3, 3′), instead of the coke bucket (3, 3′) receives the red-hot coke directly from the coke oven.
In addition, another object of the present invention is to provide the optimum operation for the CDQ system (10) in which the particle size segregation of coke is small. In this operation, in the case where the amount capacity of the coke bucket (3, 3′) corresponds to the coke amount from one oven chamber, if it is difficult to newly provide the rotary coke bucket (3) due to the narrow space at the existing coke oven, the newly provided non-rotary coke receiving bucket (1) (using the rails for the existing coke wet quenching car) once receives the red-hot coke, and then the coke receiving car (1) discharges the red-hot coke by a coke amount from two or more oven chambers to the coke bucket (3, 3′), which is newly provided adjacently to the rails for the existing coke wet quenching car, in accordance with its capacity, instead of that the coke bucket (3, 3′) directly receives the red-hot coke from the coke oven.
To solve the above-described problems, there are provided features of the present invention as follows.
(1) A first invention is transporting equipment for red-hot coke, including: a non-rotary coke receiving car for receiving coke out of a coke oven chamber; a coke bucket for receiving the coke discharged from the coke receiving car; a transporting device for transporting the coke bucket to a hoist position; and a hoist for transporting the coke bucket to a coke dry quenching system.
(2) A second invention is the transporting equipment for red-hot coke according to (1), further including one or two sets of discharge equipment are provided for discharging the coke from the coke receiving car to the coke bucket.
Herein, note that the discharge equipment (16) includes the discharge chute (2) and the dust collector hood (11) as shown in
(3) A third invention is the transporting equipment for red-hot coke according to (1) or (2), in which the transporting device is a turning table disposed on the ground or under the ground, and at least two of the coke buckets are disposed on the turning table.
(4) A fourth invention is the transporting equipment for red-hot coke according to (1) or (2), in which the transporting device is a coke bucket car, and the coke bucket car travels along a circular rail, or a straight-line rail that is arranged in parallel to a travel rail of the non-rotary coke receiving car.
(5) A fifth invention is the transporting equipment for red-hot coke according to (1) or (2), comprising: a coke bucket mounted on the transporting device and having a capacity corresponding to a coke amount from two or more oven chambers; and the hoist for transporting the coke bucket to the coke dry quenching system.
(6) A sixth invention is a transporting method for red-hot coke, comprising the steps of: receiving coke out of a small coke oven by a non-rotary coke receiving car; receiving the coke by a coke bucket; repeating the preceding two receiving steps at least two times; transporting the coke bucket that has received the coke by a coke amount from two or more oven chambers, to a hoist position; and hoisting the coke bucket by a hoist, and charging the red-hot coke into a coke dry quenching system.
(7) A seventh invention is the transporting method for red-hot coke according to (6), in which a coke amount from the one small coke oven chamber is 20 ton or less.
(8) An eighth invention is a transporting method for red-hot coke, comprising the steps of: receiving coke out of a large coke oven chamber by a non-rotary coke receiving car fitting up at least two chambers; discharging the coke by a coke amount from the one chamber to a first coke bucket; transporting the first coke bucket to a hoist position; hoisting the first coke bucket, and charging the red-hot coke into a coke dry quenching system; then, discharging the coke by a coke amount from the residual chamber to an empty second coke bucket; transporting the second coke bucket to the hoist position; and hoisting the second coke bucket, and charging the red-hot coke into the coke dry quenching system.
(9) A ninth invention is the transporting method for red-hot coke according to (8), in which a coke amount from the one large coke oven chamber is 30 ton or more.
(10) A tenth invention is the transporting equipment or the transporting method according to any one of (1) to (9), in which the coke bucket is a rotary coke bucket.
(1) With the present invention, the transporting processing for the red-hot coke may be performed efficiently, based on the optimum capacity of the coke bucket (3, 3′) and the optimum cycle time of the hoist (4) that are suitable for the capability of the CDQ system (10) regardless of the operation conditions such as the coke amount from one oven chamber, and the number of pushing operations. In particular, in the case of the small coke oven, the two or more non-rotary coke receiving cars (1) receive the red-hot coke by an amount equivalent to the coke amount from two or more oven chambers, and discharge that amount of red-hot coke to the one rotary coke bucket (3) or non-rotary coke bucket (3′). Accordingly, it is possible to employ the optimum capacity of the coke bucket (3, 3′) and the optimum cycle time of the hoist (4) that are suitable for the capability of the CDQ system (10).
Also, in the case of the large coke oven, the non-rotary coke receiving car (1) receive the red-hot coke by an amount equivalent to the coke amount from one oven chamber, by distributing the coke into two or more chambers, and discharges the red-hot coke to the rotary coke bucket (3) or non-rotary coke bucket (3′) in accordance with the capacity of the coke bucket (3, 3′). Accordingly, the equipment may be compact and inexpensive without increase in the size of the transporting equipment for red-hot coke (including the rotary coke bucket (3) or non-rotary coke bucket (3′), the hoist (4), the coke bucket car (7), and the like).
(2) With the present invention, when the CDQ system (10) is provided at the existing coke oven, the non-rotary coke receiving car (1), the coke bucket (3, 3′), and its transporting device are newly provided using the rails for the existing coke wet quenching car, so as to transport the red-hot coke to the CDQ system (10). Accordingly, the configuration may be applied to the CDQ system (10) having a predetermined characteristic without major conversion of the coke oven.
(3) In addition, since the travel rails for the non-rotary coke receiving car are the same as that of the coke wet quenching car, the existing coke wet quenching car as well as a coke quenching tower (sprinkler equipment) disposed in the extension of the rails may be used. Accordingly, even if the CDQ system (10) may not receive the red-hot coke for some reason, the system may be easily switched to the coke wet quenching equipment to transport the red-hot coke, thereby achieving safety.
(4) In addition, with the present invention, it is possible to use the coke bucket (3, 3′) of a uniform capacity, while the small coke oven, the medium coke oven, and the large coke oven are concurrently operated, thereby enhancing the operation efficiency of the CDQ system (10).
An embodiment of the present invention will be described below with reference to the drawings.
(A) Case For Small Coke Oven (small coke oven being defined such that coke amount from one oven chamber is 20 ton or less (around 10 ton))
Referring to
Rotating the rotary coke bucket (3) during reception of the red-hot coke provides a coke layer with a small particle size segregation in circumferential direction. Accordingly, the red-hot coke may be cooled uniformly in a furnace of a CDQ. As shown in
In
The coke bucket car (7) has a two-car arrangement at the receiving position (A) shown in
While rails (12) for the coke bucket car (7) are straight-line rails (12) in
Components suitable for the present invention and applied to a small coke oven will be described below.
The non-rotary coke receiving car (1) in the case of the small coke oven is newly provided using the existing rails (12) for the coke wet quenching car. Or, the existing coke wet quenching car may be used as a substitute.
The non-rotary coke receiving car (1) has the equipment specification corresponding to a transportation cycle of coke in accordance with the arrangement conditions of the subject coke oven and CDQ system (10). The equipment specification of the non-rotary coke receiving car (1) is determined on the basis of a variety of items to be considered, such as the number of tractive electric locomotives (13) of the coke receiving car (1), the shape of the coke receiving car (1), the number of sets of discharge equipment (discharge gate (5)) provided at the coke receiving car (1), and the like. For example, even when the transportation capacity of the non-rotary coke receiving car (1) is constant, one or more separation walls may be disposed at the coke receiving car (1) in a direction orthogonal to an advancing direction thereof to provide two or more chambers, and the discharge gate may be disposed at each of the chambers. Accordingly, the red-hot coke may be divided and charged to each chamber. This may increase the number of discharging operations of the red-hot coke, thereby increasing the discharging time of the red-hot coke. However, the width, length, and height of the discharge chute of the coke receiving car (1) may be decreased. As a result, the depth of a pit in which the rails (12) for the coke bucket car (1) are provided becomes small, and the distance of hoisting the coke by the hoist (4) becomes small, thereby promoting significant cost reduction.
Owing to these reasons, it is necessary to determine the shape of the non-rotary coke receiving car (1) by comprehensively considering the arrangement conditions (transportation cycle of coke) of the CDQ system (10), the shape of the discharge chute (2), and the like.
It is obvious that the capacity of one non-rotary coke receiving car (1) needs a coke amount from one oven chamber or more, however, it is unreasonable if the capacity holds a coke amount from two or more oven chambers in view of ancillary equipment. Thus, the capacity preferably corresponds to a coke amount from one oven chamber.
The shape of the non-rotary coke receiving car (1) is preferably rectangular similarly to the shape of the existing coke wet quenching car due to the small width of a space between the front of the coke oven and the rails, for receiving the red-hot coke. The bottom of the non-rotary coke receiving car is inclined toward the coke bucket (3, 3′), or the bottom of the non-rotary coke receiving car (1) has a dump function so as to prevent the red-hot coke from remaining when the red-hot coke is discharged from the non-rotary coke receiving car (1). In addition, the non-rotary coke receiving car (1) has the discharge gate (5) that can control the amount of discharge of the red-hot coke, the gate being disposed at a position of the discharge equipment (16).
The discharge equipment (16) includes the discharge chute (2) and the dust collector hood (11) as shown in
At least two coke buckets (3, 3′) are newly provided adjacently to the rails (12) for the existing coke wet quenching car, and the capacity of each bucket preferably ranges from 20 to 30 ton per bucket. In this case, one coke bucket may receive the red-hot coke by a coke amount from two or three oven chambers. The coke bucket (3, 3′) may employ a rotary coke bucket (3) or a non-rotary coke bucket (3′). The rotary coke bucket (3) is more preferable because the particle size segregation in circumferential direction of the coke is decreased, the particle size distribution in the CDQ furnace becomes uniform, flow deflection of gas in the furnace is reduced, and accordingly, thermal efficiency is enhanced. However, the present invention is not limited thereto, and may attain the object of the present invention even when employing the non-rotary coke bucket (3′).
The shape of the rotary coke bucket (3) or the non-rotary coke bucket (3′) is not limited particularly. The shape of the rotary coke bucket (3) is determined in view of its interference with respect to the peripheral equipment.
Since the rotary coke bucket (3) receives the red-hot coke while rotating, the shape thereof is preferably cylindrical to achieve the balance while rotating. The coke bucket structure includes a bucket body corresponding to the amount capacity, a hanging metal part detachably attached to the hoist (4), and a gating device provided at the bottom of the bucket and being capable of discharging the red-hot coke by way of a CDQ charging chute (9).
A transporting device (7, 15) for the coke bucket newly provided adjacently to the rails (12) for the existing coke wet quenching car may be preferably the coke bucket car (7) or the turning table (15), which is self-propelled or provided with an external driver. Rails (12) for the coke bucket car (7) or the turning table (15) is disposed on the ground or at an underground pit (14) so as to secure a drop with respect to the'rails (12) for the non-rotary coke receiving car (1). The rails (12) for the coke bucket car (7) are preferably parallel to the rails (12) for the non-rotary coke receiving car (1), or looped rails.
The capability of the hoist (4) is comprehensively determined on the basis of its hoist power (hoist load and hoist speed) corresponding to the hanging load with the above-described red-hot coke mounted, and its travel power (travel load and travel speed) related to the time cycle necessary for a coke processing amount of the coke oven chamber. The primary structure of the hoist (4) includes a hanging tool and a hoist winch for attaching/detaching and lifting up/down the coke'bucket (3, 3′) having the red-hot coke mounted, as well as a travel car and a travel driver for reciprocation between the uppermost hoist position and the CDQ charging chute (9). In addition, a coke bucket cover (8) is attached to the hanging tool, so that the coke bucket (3, 3′) is covered with the coke bucket cover (8) when the coke bucket is hung, thereby preventing heat loss, and protecting the hoist from being exposed to radiant heat of the red-hot coke during the transportation.
As described above, in the case of the small coke oven as shown in the row for the small coke oven in
(B) Case For Large Coke Oven (Large coke oven being defined such that coke amount from one oven is 30 ton or more)
The inner portion of the large non-rotary coke receiving car (1) is divided into at least two chambers by way of a separation wall (21), and two or more discharge gates (5) are prepared to receive the coke out of the coke oven. Such a large non-rotary coke receiving car (1) travels to the discharge equipment (16) (discharge position (A)), the rotary coke bucket (3) on the No. 1 car of the coke bucket car (7) waiting at the underground pit (14) receives a half of the red-hot coke mounted in the coke receiving car (a coke amount from a first chamber shown in
When the coke bucket car (7) has at least two-car arrangement and the rotary coke bucket (3) having the red-hot coke mounted thereon is hung by the hoist (4), in the another rotary coke bucket (3) being an empty coke bucket is always arranged below either of two sets of the discharge equipment (16). Accordingly, the non-rotary coke receiving car (1) traveling on the main line may be operated efficiently without time loss in transportation and discharge processing of the red-hot coke from the coke oven.
Components suitable for the present invention and applied to a large coke oven will be described below.
The non-rotary coke receiving car (1) in the case of the large coke oven is newly provided using the existing rails (12) for the coke wet quenching car. Or, the existing coke wet quenching car may be used as a substitute. The capacity of one large non-rotary coke receiving car (1) preferably ranges from 30 to 60 ton per car. The shape of the non-rotary coke receiving car (1) is preferably rectangular in plan view on account of the narrow space between the front of the coke oven and the rails (12). In addition, at least one separation wall (21) is provided at the center portion of the non-rotary coke receiving car (1) to divide the inner portion into at least two chambers, so that the red-hot coke out of the oven chamber (17) is distributed into two or more chambers by way of the separation wall (21). Note that the number of the separation walls of the coke receiving car (1) is three or less at a maximum, and thus, the number of the chambers becomes four or less.
Since the discharge equipment (16), the coke bucket (3, 3′), the transporting device (7, 15) of the coke bucket, and the hoist (4) may employ configurations similar to that in the above-described case for the small coke oven, the description of these configurations will be omitted.
In the case of the large coke oven as shown in the row for the large coke oven in
(C) Case of Medium Coke Oven (Medium coke oven being defined such that coke amount from one oven is more than 20 ton and less than 30 ton)
As shown in the lower row for a medium coke oven in
Components suitable for the present invention and applied to a medium coke oven will be described below.
The non-rotary coke receiving car (1) in the case of the medium coke oven is newly provided using the existing rails (12) for the coke wet quenching car. Or, the existing coke wet quenching-car may be used as a substitute. The specifications of the non-rotary coke receiving car (1) is necessary to be determined by comprehensively considering the arrangement conditions of the subject coke oven and CDQ system (10) (transportation cycle of coke), the number of tractive electric locomotives (13) of the coke receiving car, the shape of the coke receiving car (1), the shape of the discharge chute, and the like. It is obvious that the capacity of one non-rotary coke receiving car (1) is necessary to correspond to a coke amount from one oven chamber or more, however, it is unreasonable if the capacity holds a coke amount from two or more oven chambers in view of ancillary equipment. Thus, the capacity preferably corresponds to a coke amount from one oven chamber.
The shape of the non-rotary coke receiving car (1) is preferably rectangular similarly to the shape of the coke wet quenching car due to the small width of a space between the front of the coke oven and the rails, for receiving the red-hot coke. The bottom of the non-rotary coke receiving car (1) is inclined toward the rotary coke bucket (3), or the bottom of the non-rotary coke receiving car (1) has a dump function so as to prevent the red-hot coke from remaining when the red-hot coke is discharged from the non-rotary coke receiving car (1). In addition, the non-rotary coke receiving car (1) has, in its inner side and at its outlet portion, the discharge gate (5) that can control the amount of discharge of the red-hot coke, the gate being disposed at a position of the discharge equipment (16).
At least two rotary coke buckets (3) are newly provided adjacently to the rails (12) for the existing coke wet quenching car, and the capacity of each bucket preferably ranges from 20 to 30 ton per bucket. The shape of the rotary coke bucket (3) is determined in view of its interference with respect to the peripheral equipment. Since the rotary coke bucket 3) receives the red-hot coke while rotating, the shape thereof is preferably cylindrical to reduce the particle size segregation in circumferential direction, and achieve the balance while rotating. The coke bucket structure includes a bucket body corresponding to the amount capacity, a hanging metal part detachably attached to the hoist (4), and a gating device provided at the bottom of the bucket and being capable of discharging the red-hot coke by way of a CDQ charging chute (9).
Since the discharge equipment (16), the transporting device (7, 15) of the coke bucket, and the hoist (4) may employ configurations similar to that in the above-described case for the small coke oven, the description of these configurations will be omitted.
In the case of the medium coke oven, as shown in the row for the medium coke oven in
An example using the transporting equipment according to the present invention will be described.
Table 1 shows:
(1) comparison of the processing cycle of the hoist (4) using the transporting equipment of the present invention for the small coke oven, with respect to that of the related art, and
(2) comparison of the processing cycle of the hoist using the transporting equipment of the present invention for the large coke oven, with respect to that of the related art.
In either case, the processing amount of coke of the coke oven is 189 ton/hr, and hence, the transporting capability of coke necessary for the hoist is 189 ton/hr.
(1) Regarding the case of the small coke oven with the coke amount from one oven chamber being 13.5 ton, in the related art (hoist amount of 13.5 ton at a time), the processing cycle of the hoist (4) is 10 cycles/hr at a maximum since the shortest cycle time is 6 min/cycle, and accordingly the transporting processing is 10 oven chambers/hr (135 ton/hr). Therefore, the transportation of the red-hot coke is insufficient, and this means that the productivity of the coke oven is decreased to 135 ton/hr.
On the other hand, when the transporting equipment of the present invention is used, and the capacity of the rotary coke bucket (3) is determined to 27 ton, the processing cycle of the hoist (4) is 7 cycles/hr at a maximum since a cycle time of the hoist (4) is 8.6 minutes/cycle which is longer than the shortest cycle time of the hoist of 6 minutes/cycle. Accordingly, the transportation capability achieves 14 coke oven chambers/hr (189 ton/hr), thereby sufficiently transporting the red-hot coke to the CDQ system (10). The use of the transporting equipment of the present invention do not cause decrease in the productivity of the coke oven.
(2) Regarding the case of the large coke oven with the coke amount from one oven chamber being 54 ton, in the related art (hoist amount of 54 ton at a time), the processing cycle of the hoist (4) is 3.5 cycles/hr since the cycle time of the hoist (4) is 17.1 minutes/cycle. Since the rotary coke bucket (3) has a heavy load such as 54 ton, the hoist power becomes excessively large, and the increase in weight of the hoist as well as reinforcement of the structure for the hoist are necessary, resulting in serious cost increase. When the transporting equipment of the present invention is used and the capacity of the rotary coke bucket (3) is determined to 27 ton, the processing cycle of the hoist (4) became 7 times/hr at a maximum since a cycle time of the hoist (4) is 8.6 minutes/cycle which is longer than the shortest cycle time of 6 minutes/cycle of the hoist (4). Accordingly, the processing is available according to the capability of the hoist (4) of the related art, even when the capacity of the coke bucket is 27 ton, which is a half of the value of the related art. Therefore, this embodiment according to the present invention does not need overcapacity of a hoist.
By using the transporting equipment according to the present invention for transporting the red-hot coke from the oven chamber (17) of the coke oven to the CDQ system (10), the CDQ system (10) may be operated efficiently regardless of the degree of the coke amount from one oven chamber.
This application is a continuation application of application Ser. No. 12/225,287 filed Sep. 17, 2008, which is the United States national phase application under 35 USC 371 of International application PCT/JP2006/309355 filed Apr. 28, 2006. The entire contents of each of application Ser. No. 12/225,287 and International application PCT/JP2006/309355 are hereby incorporated by reference herein.
| Number | Date | Country | |
|---|---|---|---|
| Parent | 12225287 | Sep 2008 | US |
| Child | 13531949 | US |
