JP3308907B2 - Water type gas holder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas holder for storing, for example, a by-product gas generated from a steel mill or the like and a raw material gas for producing city gas, and more particularly to a water tank and a gas tank containing water for sealing. The present invention relates to an improvement of a water-based gas holder configured by a gas tank that moves up and down according to an increase or decrease in a storage amount.

[0002]

2. Description of the Related Art City gas, coke oven gas, and the like are produced day and night, but the amount of use is determined by demand. In many cases, the gas is supplied after being stored in a gas holder. In particular, a large amount of converter gas is generated intermittently and in a short time in a blowing operation in a steelmaking process of a steel mill. The type that goes up and down is often used. That is, while the stored gas amount is small, the gas 3 is stored only in the inner gas tank 4 as shown in FIG. 4, and the gas tanks 5 and 6 are landed. The gas 3 stored in the gas tank 4 is sealed by the water 19 filled in the water tank 7, which is the outermost tank, so that the gas 3 does not leak out of the tank. As the gas flows into the gas tank 4 through the gas inflow pipe 1 and the amount of stored gas increases, the plurality of gas tanks 4, 5, and 6 rise while being sequentially connected. Conversely, the gas flows out from the gas outflow pipe 2 and the stored gas amount decreases, and the gas tanks 4, 5, and 6 descend sequentially to 6,
Land in the order of 5,4. In order to prevent accidental tilting or eccentricity of the gas tank during the ascent / descent operation, an upper roller provided on the circumference of the upper end of each of the gas tanks 4, 5, and 6 is provided in the gas holder. 8, 10, 12; lower rollers 9, 11, 13 arranged on the circumference of the lower end; base pillars 14, inner pillars 15, 1 arranged for supporting and guiding those rollers;
A guide roller mechanism composed of 6, 17 and the like is provided. As shown in FIG. 5, the inner pillars 15 and 16 are provided on the inner peripheral surfaces of the gas tanks 5 and 6, respectively, and the inner pillar 17 is provided on the inner peripheral surface of the water tank 7 (FIG. 4). About 10
mounting legs 20 provided at both upper and lower ends of a long inner pillar
Is fixed to the inner peripheral surface of the tank by welding. Inner pillar 15,1
Although the body of 6 is slightly separated from the inner peripheral surface of each gas tank 5, 6, each gas tank 5, 6 is formed by slightly overlapping several steel plates in the height direction and joining them. Therefore, the size of the gap between the inner pillar body and the tank inner peripheral surface is, for example, 4 to
There is a width of about 8.5 mm.

[0003]

The gas tanks 4, 5, and 6 of the gas holder are immersed in sealing water in a lowered state. When floating, the water adheres to the inner wall of the gas tank. When the stored gas is, for example, a converter gas, its components are carbon monoxide, carbon dioxide and some nitrogen. Therefore, carbon dioxide in the converter gas dissolves in the adhering water that comes into direct contact with the stored gas to form carbonated water, which erodes the inner wall of the gas tank made of a steel plate to cause corrosion and pitting. The mechanism of corrosion and pitting caused by carbon dioxide gas is well known, and in order to prevent this, it has been generally practiced to apply an anticorrosion coating to the inner wall of the gas tank.

However, the present inventors conducted a detailed investigation on the entire surface of the gas tank inner wall of the gas holder used for a long period of time in order to grasp the actual situation of corrosion and pitting of the inner wall of the gas tank. The new fact that the corrosion and pitting conditions of the specific part of the garbage are becoming apparent is found. As a result of earnest studies based on this fact, it was found that the corrosion and pitting of the specific portion were caused by the bending of the inner pillar which is a member of the guide roller mechanism. That is, due to the pressing force from the lower roller due to the inclination and eccentricity that occurs accidentally when the gas tank is raised and lowered, the inner pillar attached to the inner wall of the tank through the gap with the mounting legs is elastically deformed, bent and painted. It repeatedly contacts the inner wall of the tank (see FIG. 5). The contact peels off the coating film applied to the inner wall of the gas tank, and the inner pillar repeats contact even after the peeling of the coating film. Therefore, the abrasion of the inner wall of the gas tank and the corrosion and pitting caused by the carbonated water adhered thereto. It turned out to be localized. In other words, each time the gas tank moves up and down, the inner pillar bends and damages the coating film and the steel plate on the inner wall of the gas tank in contact with each other. It cannot be avoided by means alone.

Conventionally, the use of a gas holder has been periodically stopped with regard to the perforation of the gas tank, and emergency repairs such as welding and reinforcing a steel plate suitable for the size of the corrosion or pit portion from the outer wall of the gas tank have been performed. And responded. For the steel plate welding work, it is necessary to stop using the gas holder, replace the gas stored in the gas holder with air, and then supply pressurized air to keep the gas tank at a predetermined position from the sealed water surface. There is.

However, if the use of the gas holder is periodically stopped for emergency repair, for example, it is necessary to prepare a spare gas holder or to secure a worker, which is problematic in terms of resource saving and labor saving. In addition, with respect to the emergency repair method in which a steel plate is welded and joined from the outer wall, there is also a bad effect that the coating film applied to the inner wall of the gas tank is burned by welding heat.

Incidentally, the above-mentioned fact that the specific portion of the inner wall of the gas tank is corroded and pitted is a new fact based on the result of the research conducted by the inventor of the present invention. There is no technology.

The present invention has been made in view of these circumstances, and an object of the present invention is to provide a gas holder which does not damage the painted surface applied to the inner wall of the gas tank even when the inner pillar repeatedly contacts the inner wall of the gas tank. It is.

[0009]

In order to achieve the above object, the invention according to claim 1 includes a gas tank which rises and falls in accordance with an increase and decrease of a gas storage amount in a tank containing water for sealing. In a water-type gas holder in which an inner column for correcting the ascending / descending posture is disposed between the respective tanks, a cushion material is disposed between an inner peripheral surface of the gas tank and the inner column facing the same. It is characterized by the following. According to a second aspect of the present invention, in the water-containing gas holder according to the first aspect, the cushion member is a rubber plate.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. The same or corresponding parts as those in the related art are denoted by the same reference numerals, and redundant description will be omitted.
1 is a perspective view of an inner column provided in a gas tank of the water-containing gas holder of the present embodiment, FIG. 2 is a cross-sectional view showing a main structure and operation of a gas tank having the inner column, and FIG. It is a partial enlarged view. First, an outline of the overall structure will be described. As shown in FIG. 4, this water-containing gas holder comprises three gas tanks 4, 5 having different diameters arranged concentrically inside a cylindrical water tank 7.
6 and the innermost gas tank 4 is covered. As shown in FIG. 2A, each tank in a state where gas is not stored has its lower part landed and is submerged in the water stored in the water tank 7.
The lower end of the gas tank 4 and the upper and lower ends of the gas tanks 5 and 6 have connecting portions R respectively. The connecting portion (4
R _L ) engages with the connecting portion (5R _U ) at the upper end of the gas tank 5,
The connecting part (5R _L ) at the lower end of the gas tank 5 is structured to be able to engage with the connecting part (6R _U ) at the upper end of the gas tank 6.

[0011] Lower connecting rollers 9, 11, 12 are juxtaposed to connecting portions _RL at the lower ends of the gas tanks 4, 5, 6, respectively. On the other hand, upper rollers 8, 10, 12 are provided at the upper ends of the gas tanks 4, 5, 6 via arms.

A plurality of base pillars 14 are provided so as to surround the outer periphery of the water tank 7, and the inner surfaces thereof are formed by upper rollers 8, 10,.
12 is a guide surface on which the vehicle runs. The inner pillars 15, 16, and 17 fixed to the inner peripheral surfaces of the gas tanks 5, 6 and the water tank 7, respectively, with upper and lower ends fixed thereto, have flat bodies 19 formed on channel steel 18 as shown in FIG. It has a square steel pipe shape attached. Attachment legs 20 made of equilateral angle steel are welded to the upper and lower ends of the inner column main body, respectively. The inner pillars are attached to the gas tanks 5 and 6 and the water tank 7 by welding the mounting legs 20 to the inner circumferential surface of the tank with the outer surface of the flat steel 19, which is the back surface of the inner pillar, facing the inner circumferential surface of the tank. . The inner pillar of the present embodiment is different from the conventional one in that a rubber plate 21 as a cushion material is attached to the inner pillar back surface (outer surface of the flat steel 19) which is a surface facing the inner wall of the tank. . This rubber plate 21
An adhesive is practically used on the industrial scale for sticking. However, the gas tanks 5 and 6 provided with the rubber plate 21 are in a severe environment in which water is repeatedly exposed and exposed to gas due to the rise and fall of the gas storage amount. Therefore, there is a possibility that the rubber plate 21 may be peeled off due to the deterioration of the adhesive, and it is preferable to use a physical attachment means such as a screw for safety. The cushion material is not limited to a rubber plate, but may be any cushion material that does not damage the coating film on the inner wall of the gas tank or the steel plate.

Each of the inner pillars 15, 16, 1 thus constructed
Dozens of steel pipes 7 are arranged on the inner peripheral surfaces of the gas tanks 5 and 6 and the water tank 7, respectively. The lower rollers 9, 11, and 12 at the lower end of 6 run in contact with each other, and together with the upper rollers 8, 10, and 12, correct the elevation posture of each of the gas tanks 4, 5, and 6.

Next, the operation will be described. Now, when the gas 3 is fed from the gas inflow pipe 1 into the gas tank 4 in the state of FIG. 2A, the gas tank 4 rises as the gas storage amount increases. When the gas tank 4 reaches a single ascending limit as shown in FIG. 2B, the connecting portion (4R _L ) at the lower end engages with the connecting portion (5R _U ) at the upper end of the gas tank 5. If the gas 3 is continuously supplied, as shown in FIG. 2C, the gas tank 4 and the gas tank 5 continue to be connected and continue to rise. Thereafter, in the same manner, the maximum storage amount eventually reaches the maximum storage amount when the gas tank 6, which is the outermost tank, reaches the ascending limit. If the gas tanks 4, 5, 6 are inclined or eccentric for some reason during this ascent, the corresponding lower roller 9 presses the inner pillars 15, 16, 17 to which it comes into contact outward. Therefore, as shown in FIG.
While being elastically bent, the local contact with the stepped inner peripheral surfaces of the gas tanks 5 and 6 is repeated. Since the contact in this case is made via the rubber plate 21 as a cushion material, the coating on the inner peripheral surfaces of the gas tanks 5 and 6 does not peel off unlike the conventional case. Therefore, the phenomenon of abrasion of the inner peripheral surfaces of the gas tanks 5 and 6, corrosion by the attached carbonated water, and concentration of pitting corrosion can be prevented.

When the stored gas 3 in the tank flows out of the tank via the gas outlet pipe 2, the gas tank 4,
5 and 6 sequentially settle as the gas amount decreases. In the course of the sedimentation, even if the gas tank is inclined or eccentric as described above, the contact between the inner pillars 15 and 16 and the inner peripheral surfaces of the gas tanks 5 and 6 causes the rubber plate 21 serving as a cushioning material to contact. The coating on the inner peripheral surfaces of the gas tanks 5 and 6 is not peeled off since the coating is performed through the gas tanks. (Embodiment) Hereinafter, the effect of the present invention will be described in detail by an embodiment in which the present invention is applied to a gas holder having a geometric volume of 50,000 cubic meters.

Table 1 shows the specifications of the gas tanks 5 and 6, and the inner pillars 15 and
Table 2 shows the specifications of the sixteen.

[0017]

[Table 1]

[0018]

[Table 2]

When the gap between the inner peripheral surface of the gas tank and the inner column was measured, it was 4 to 8.5 mm. This change in the gap is, as described above, because the gas tank is formed by joining several steel plates in the height direction.
The size of the rubber plate 21 as a cushion material attached to the back surface of the inner pillars 15 and 16 (the surface facing the inner peripheral surface of the gas tank) has a width of 2
The dimensions were 40 mm, length 9600 mm, thickness 3 mm, and the dimensions other than the thickness were the same as those of the flat steel 19 facing the inner wall of the gas tank. As the material, NBR of synthetic rubber was selected in consideration of chemical stability when water immersion and exposure to gas were repeated. The rubber plate 21 was attached to the flat steel 19 by applying an adhesive mainly composed of chloroprene-based synthetic rubber to the entire joint surface. Furthermore, a diameter of 5 mm is used as a physical attachment means.
mm drill screw was used together. The mounting points of the drill screws were two in the lateral direction with a rubber plate width of 240 mm and six in the height direction with a rubber plate length of 9,600 mm.

Table 3 shows the effect of extending the life of the gas tank by using the rubber plate 21. In the table, “before” is a comparative example in which the rubber plate 21 was not used, and “after” is an example of the present invention in which the rubber plate 21 was used. According to the embodiment, since the coating film applied to the inner wall of the gas tank is not damaged by raising and lowering the gas tank, the gas tank has a very good effect of preventing corrosion and pitting of the gas tank. It is clear that the effect of significantly extending the life was obtained.

[0021]

[Table 3]

In the above description, the cushion member disposed between the inner peripheral surface of the tank and the opposing inner column is shown as being disposed on the entire opposing surface of the inner column. However, for example, it is also possible to dispose only the portion of the opposing surface of the inner column that contacts the inner peripheral surface of the tank.

Further, it is not always necessary to provide a cushion material on the opposing surface of the inner column 17 opposing the inner wall of the water tank 7. Even if the coating peels off due to the contact between the two, the inner wall of the water tank is always in the water, so it can be said that there is little risk of corrosion and pitting corrosion due to carbonated water.

[0024]

As described above, according to the present invention, even if the inner pillar repeatedly comes into contact with the inner peripheral surface of the gas tank, the cushion material prevents the coating film applied to the inner wall of the gas tank from being damaged. ,
Corrosion and pitting of the gas tank are remarkably prevented, and as a result, the life of the gas tank of the gas holder can be greatly extended as compared with the conventional case.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of an inner column in a water-containing gas holder according to the present invention.

FIG. 2 is a sectional view of a main part of a water type gas holder according to the present invention, wherein FIG.
(C) shows the process of ascending the gas tank when the gas storage amount increases.

FIG. 3 is a cross-sectional view illustrating an operation of the inner pillar according to the present invention shown in FIG.

FIG. 4 is a schematic cross-sectional view showing an outline of the whole water type gas holder.

FIG. 5 is a cross-sectional view illustrating an operation of an inner column in a conventional water-containing gas holder.

[Explanation of symbols]

 4, 5, 6 Gas tank 7 Water tank 8, 10, 12 Upper roller 9, 11, 13 Lower roller 15, 16, 17 Inner pillar 19 Water for sealing 21 Cushion material (rubber plate)

Claims (2)

(57) [Claims] A gas tank which rises and falls according to an increase and decrease of a gas storage amount is provided in a tank filled with water for sealing, and an inner pillar for correcting a rising and falling posture is provided between the tanks. In a water-type gas holder, a cushion material is disposed between an inner peripheral surface of the gas tank and the inner column facing the inner surface of the gas tank. 2. The water type gas holder according to claim 1, wherein the cushion member is made of a rubber plate.