JP5735058B2 - Dry main replacement method - Google Patents

Description

The present invention relates to a method for replacing a dry main of a coke oven.

The coke oven has a heat storage chamber in the lower part of the furnace body, and has a structure in which carbonization chambers and combustion chambers are alternately arranged in the upper part. The fuel gas is burned in the combustion chamber, and in the carbonization chamber adjacent to the combustion chamber. Coke is obtained by dry distillation of coal.
The coke oven gas generated by the dry distillation of coal is recovered to the dry main from the riser installed in each carbonization chamber. By injecting ammonia-containing water (so-called low water) into the dry main, the coke oven gas is cooled, and by-products (eg, coal tar, sludge, etc.) are separated from the coke oven gas and sent to the by-product treatment facility. It is done.

Since the dry main body always comes into contact with the water in this manner, corrosion tends to proceed, and it is necessary to replace the dry main body with a relatively high frequency. In the replacement work of the dry main, it is necessary to stop the carbonization of coal and prevent the coke oven gas from being scattered, and in the construction method that requires a long time for the replacement work, there is a problem that the productivity of the coke oven is reduced.
Conventionally, the replacement work of the dry main has been done by dismantling the existing dry main on the coke oven, lowering the dismantled parts with a crane installed on the ground, and then lifting the new parts with the crane. The procedure is to assemble. However, an extruder is disposed on one of the longitudinal side surfaces of the coke oven, and a guide car and a fire extinguisher are disposed on the other side surface. As a result, when installing a crane near the side of the coke oven, it is necessary to use a small crane, and it is dismantled to reduce the weight of the crane's suspended load (hereinafter referred to as the suspended load). Parts and new parts need to be disassembled into small parts. Such replacement work causes an increase in the number of times the crane is hung and causes an extension of the construction period.

  On the other hand, a large crane can be installed in the vicinity of the end face in the longitudinal direction of the coke oven because there are few restrictions on the place where the crane is installed. If a large crane is used, the weight of the suspension load can be increased, and the number of suspensions can be reduced. However, with that crane alone, parts disassembled at any location on the coke oven are transported to the longitudinal end face of the coke oven, or new parts are transported from the longitudinal end face of the coke oven to any location on the coke oven. It is difficult to do.

In order to solve this problem, a cart that travels between an arbitrary place on the coke oven and a longitudinal end surface of the coke oven has been studied. For example, Patent Document 1 discloses a cart that travels on a track of a coal-cooked vehicle. It is disclosed.
The technique disclosed in Patent Document 1 uses a bogie traveling on a track and a suspended beam installed on a coke oven when exchanging a furnace top duct. And since the member of a furnace top duct is lifted from a trolley with a suspension beam and installed and assembled at a predetermined position, a member exceeding the suspension load permitted by the suspension beam cannot be transported. That is, the technique disclosed in Patent Document 1 leaves room for improvement from the viewpoint of further reducing the number of suspensions, that is, shortening the work period.

JP 2005-290251 A

  An object of the present invention is to provide an exchange method that can reduce the construction period by reducing the number of crane suspensions when replacing the dry main of a coke oven.

In order to reduce the number of times the dismantled parts and new parts are suspended in the replacement work of the dry main of the coke oven, the inventors have made the dry main and the pipes such as ascending pipes and off-take mains attached thereto (hereinafter referred to as the “main pipe”). The construction method that transports the integrated pipe and the deck used by the workers for inspection etc. was examined from the following viewpoints (A) to (C). That is,
(A) Use a large crane installed on the ground for transportation between the coke oven and the ground.
(B) Since the location where the crane of (A) above is installed is restricted, a carriage is used for transportation on the coke oven.
(C) In order to make the best use of the allowable suspension load of the crane of (A) above, there are three points that the crane and suspension beam are not used on the coke oven.

As a result of the examination, the positions where the incidental piping and the deck are installed in the dry main are not necessarily arranged symmetrically, so that the posture of the dry main is stabilized during transportation and the dry main on the carriage is lifted and lowered to dismantle It was found that the number of suspended parts and new parts can be reduced, and the construction period can be greatly shortened.
The present invention has been made based on such knowledge.

  That is, according to the present invention, two or more transport carts that travel on a track composed of a pair of rails provided for running a coal-mounted vehicle on a coke oven are connected at a fixed interval, and the first is attached to each upper surface of the transport cart. A mounting carriage that can move in a direction perpendicular to the track is arranged, and a dry main is mounted on the upper surface of the mounting carriage together with the auxiliary piping and the deck so as to be movable in the vertical direction and is dry using a chain block. This is a dry main replacement method in which a main weight is prevented from falling, and a counterweight is attached to the mounting cart to prevent the mounting cart from falling from the transport cart, and the exchanging work is performed by transporting the coke oven.

  In the exchanging method of the present invention, it is preferable that the mounting carriage moves on a track composed of a pair of rails provided on the transport carriage.

  According to the present invention, when exchanging the dry main of the coke oven, the number of crane suspensions can be reduced and the construction period can be greatly shortened.

It is sectional drawing which shows typically the principal part of the trolley | bogie used by this invention, and the dry main body installed in the coke oven. It is a top view which shows typically the example of arrangement | positioning of a coke oven and a dry main. It is sectional drawing which shows typically the example which moved the mounting trolley below the dry main body. It is sectional drawing which shows typically the example which moved the mounting trolley on the conveyance trolley.

FIG. 1 is a cross-sectional view schematically showing main parts of a carriage used in the present invention and a dry main body installed in a coke oven.
First, a cart used in the present invention will be described with reference to FIG.
A pair of rails 2 are provided on the coke oven 1, and in a normal operation, a charcoal vehicle (not shown) travels on a track (hereinafter referred to as a first track) composed of the rails 2. During the replacement work of the dry main 5, the carbonization of coal is stopped, so the running of the coal-carrying car is also stopped, the carriage 3 is lifted on the coke oven 1 by a crane installed on the ground, and it runs on the rail 2. Arrange them as possible. As a crane to be used, a large crane capable of hanging or lifting heavy objects such as dry mains is installed in the vicinity of the longitudinal end face of the coke oven 1. Here, the longitudinal direction of the coke oven 1 refers to a direction parallel to the central axis of the dry main 5 shown in the plan view of FIG. 2, and the longitudinal end surface refers to a wall surface perpendicular to the central axis of the dry main 5.

  A mounting carriage 4 is disposed on the upper surface of the transport carriage 3 so that it can move in a direction perpendicular to the track made of the rails 2 (that is, the first track). The means for moving the mounting carriage 4 is not particularly limited. However, since the dry main 5 to be transported is heavy, a pair of rails (not shown) are laid on the transportation carriage 3 and moved on the rails. It is preferable. A trajectory (hereinafter referred to as a second trajectory) on which the mounting carriage 4 moves is perpendicular to the first trajectory.

The second track is laid horizontally (that is, parallel to the upper surface of the coke oven 1). In the cross-sectional view of FIG. 1, the transport carriage 3 is raised on the rail 2 of the first track. This shows a frame having a predetermined thickness in order to maintain the strength of the transport carriage 3. The second track is also laid horizontally on the rail 2 of one track (see FIG. 3).
Next, the procedure for carrying out the existing dry main from the coke oven will be described with reference to FIGS.

  As shown in FIG. 3, the transport carriage 3 (see FIG. 1) is stopped at a predetermined position on the first track, the mounting carriage 4 is moved along the second track (not shown), and the dry main 5 Stop at the bottom. At that time, the auxiliary track 6 may be laid horizontally from the end of the second track to the lower part of the dry main 5 as required. When a rail is laid as the second track, the auxiliary track 6 also uses a rail.

  Thereafter, the jack 7 mounted on the mounting carriage 4 is raised and brought into contact with the dry main 5. In such a state that the dry main 5 is supported by the jack 7, the dry main 5 is cut to a predetermined length, and the water, coal tar, sludge, etc. remaining in the dry main 5 are not leaked. Block the cut surface. At this time, the deck 8 is also cut according to the length of the dry main 5. It is not necessary to remove the deck 8 from the dry main 5. Although not shown in FIG. 3, the incidental pipes such as the rising pipe 9 and the offtake main 10 as shown in FIG. 2 are not removed from the dry main 5 and are not required to be replaced (for example, the coke oven 1) Separate.

  Thus, the dry main 5 is cut, and the dry main 5 is fixed to the mounting carriage 4 with the chain block 11 to prevent the dry main 5 from falling over. Further, a counterweight 12 is attached to the mounting cart 4 to prevent the mounting cart 4 from falling from the second track. As shown in FIG. 3, since the dry main 5 is transported without removing the deck 8 and incidental piping (not shown), the center of gravity is biased, and the posture is stabilized by using the chain block 11 and the counterweight 12. Thus, as will be described later, it is possible to prevent the vehicle from falling or falling when transported by the transport cart 3.

Next, as shown in FIG. 4, the jack 7 is lowered, and the mounting carriage 4 is moved onto the transport carriage 3. At this time, a stable posture can be continuously maintained by adjusting the length of the chain block 11 following the lowering of the dry main 5.
Then, the transport carriage 3 travels on the rail 2 of the first track to the end surface in the longitudinal direction of the coke oven 1. Since the dry main 5 is long, two or more transport carts 3 are used, and the transport carts 3 are connected so that they can run at a constant interval. Each of the transport carts 3 travels with the mounting cart 4 mounted thereon. When the transport carriage 3 arrives at the end face in the longitudinal direction of the coke oven 1, the dry main body 5 is suspended using a crane. Thereafter, the dry main 5 is sent to the assembly ground and dismantled.

The above is the procedure for carrying out the existing dry main from the coke oven.
Next, a procedure for carrying a new dry main onto the coke oven will be described with reference to FIGS.
As shown in FIG. 4, the dry main 5 is lifted by a crane on a jack 7 mounted on the mounting carriage 4, and the posture is stabilized by using a chain block 11 and a counterweight 12. At this time, the jack 7 is lowered. The new dry main 5 is manufactured by attaching a deck 8 and incidental piping (not shown) at the building site.

Then, the transport carriage 3 is run and stopped at a predetermined position. At this time, two or more transport carts 3 are used, but since they are the same as described above, detailed description is omitted here.
Next, the mounting carriage 4 is moved along a second track (not shown) and stopped at the installation position of the dry main 5. Since the auxiliary track 6 used here is the same as described above, the description thereof is omitted.

Subsequently, as shown in FIG. 3, the jack 7 is raised and the dry main 5 is centered, and not only the new dry main 5 but also the deck 8 and incidental pipes are joined to corresponding peripheral equipment. Since the functions of the chain block 11 and the counterweight 12 used to stabilize the posture of the dry main 5 are the same as described above, description thereof will be omitted.
Thereafter, the jack 7 is lowered, and the mounting carriage 4 is further moved onto the transport carriage 3 (see FIG. 1).

The above is the procedure for carrying a new dry main onto the coke oven.
The means for driving the transport carriage and the mounting carriage is not particularly limited, but it is preferable to use a winch or a chain block. You may tow a conveyance cart with a charcoal vehicle.
As described above, according to the present invention, the long dry main can be replaced without separating the deck and the accompanying piping, so that the construction period can be greatly shortened.

  In addition, after completion | finish of replacement work, it is preferable to remove a conveyance trolley | bogie, a mounting trolley | bogie, and an auxiliary | assistant track | truck so that operation of a coke oven may not arise.

One crane (upper limit of 60 tons of allowable lifting load) is installed near the end face in the longitudinal direction of the coke oven, and two transport carts are connected and run to replace the 30 m dry main (total weight 50 tons). Was carried out by the method of the present invention. As a result, the replacement work was completed on the 13th construction period (the number of times the dry main was suspended).
In contrast, conventionally, two cranes (upper limit of 30 tons of allowable load) are installed in the vicinity of the longitudinal side surface of the coke oven without using a transport cart, and the existing dry mains are reduced on the coke oven. After dismantling and carrying out with a crane, a new relatively small member was carried into a coke oven with a crane and assembled. When a dry main body having the same scale as described above is replaced by this conventional method, the number of suspensions increases, and 19 days are required.

  That is, according to the construction method of the present invention, it was confirmed that the construction period of the replacement work of the dry main can be shortened by 32%.

DESCRIPTION OF SYMBOLS 1 Coke oven 2 Rail of 1st track 3 Carriage cart 4 Mounting cart 5 Dry main 6 Auxiliary track 7 Jack 8 Deck 9 Rise pipe
10 Off Take Main
11 Chain block
12 Counterweight

Claims (2)

  Two or more transport carts traveling on a track composed of a pair of rails installed to run a coal-cooked car on a coke oven are connected at regular intervals, and perpendicular to the track on each upper surface of the transport car A mounting carriage that can move in any direction is arranged, and the dry main is placed on the upper surface of the mounting carriage so as to be movable in the vertical direction together with the auxiliary piping and the deck, and the dry main body is turned over using a chain block. Preventing and mounting the counterweight on the mounting carriage to prevent the mounting carriage from falling from the transporting carriage, and transporting the coke oven to perform the dry main replacement work. Replacement method for dry mains.   2. The dry main replacement method according to claim 1, wherein the placing carriage moves on a pair of rails provided on the transport carriage.

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