JP2004150525A - Sheet type gas holder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sheet type gas holder having a simple structure for reduced construction costs, excellent in operability, and high in durability. <P>SOLUTION: A flat shaped bottom sheet, a cylindrical shaped side sheet, and a dome shaped roof sheet each made of an airtight and liquidtight flexible sheet material are integrally formed as a bag inside a storage reservoir made of slate or metal. A nozzle is provided on the bottom sheet of the bag for gas to go in and out. Flare shaped welding parts of a circumference end of the bottom sheet and a circumference end of the bottom part of the side sheet are fixed to the bottom slab using a pressure bar plate or a screwing member. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a biogas power generation facility that generates methane gas from organic waste such as human waste, septic tank sludge, waste from livestock and marine products facilities, garbage, and the like, a waste gas from a steel mill, and a low-pressure industrial gas. The present invention relates to a membrane type gas holder applied to a storage facility or the like.
[0002]
[Prior art]
A conventional “dry gas holder” is disclosed in, for example, Japanese Patent No. 303170 (see Patent Document 1) by the present applicant.
This conventional dry gas holder has a piston deck that can move up and down while maintaining the horizontal level in the vertical direction, and a ring-shaped piston fender standing on the outer periphery of the piston fender inside the outer shell body. An inner seal rubber having one end fixed and the other end fixed to the mounting portion of the T fender is provided. An outer seal rubber having one end fixed to the T fender and the other end fixed to the inner wall of the side plate substantially at the T fender height is provided. It is a structure provided.
[0003]
In addition, there is an invention of a "constant-pressure vertical-acting gas bag" (see Patent Document 2), which is made in a substantially pyramid shape by using a flexible airtight material.
The conventional constant-pressure vertical-acting gas bag has a sawtooth-shaped vertical cross-section of the peripheral side wall, and sequentially moves from the upper part to the lower part so that all the refraction folds 2 move up and down at a constant internal pressure. It is formed to have a large area.
In addition, as shown in FIGS. 7 and 8, the base ends of the suspension ropes are fixed at evenly distributed positions on the upper surface of the rigid plate at the ceiling of the gas bag. The balanced weights 5 corresponding to each are mounted.
[0004]
In addition, there is a device of "diaphragm type gas holder" (see Patent Document 3).
In this conventional diaphragm gas holder, the upper opening of the holder body is covered with a roof, and in the diaphragm gas holder in which the diaphragm is attached, the diaphragm is extended downward so as to eliminate dead space at the lower part of the holder body. It has a corresponding shape.
[0005]
In addition, there is an invention of "the structure of a balloon provided so as to be able to move up and down in a tank" (see Patent Document 4).
This conventional invention prevents the contact friction when the balloon is slackened, and furthermore, enables the measurement at all times and reduces the installation space. At the end, a disk made of an inflexible material is mounted at the center of the top, and a rope connected to the balance weight is mounted at the center of the disk, so that the tank can be moved up and down. It is.
[0006]
[Patent Document 1]
Japanese Patent No. 303170 (FIGS. 1 and 2 and page 3, right orchid line 37 to page 4 left orchid line 23)
[Patent Document 2]
JP-B-58-31520 (FIGS. 7 to 11 and page 2, right orchid lines 24 to 28, page 2 right orchid lines 37 to 44)
[Patent Document 3]
Japanese Utility Model Application Laid-Open No. 63-18700 (FIGS. 1 and 2 and claims for utility model registration)
[Patent Document 4]
JP-A-5-229592 (FIG. 1 and page 2, right orchid lines 5 to 8; page 2 right orchid lines 18 to 23)
[0007]
[Problems to be solved by the invention]
As shown in FIG. 1, the dry-type holder of Patent Document 1 introduced above has a complicated structure of a piston deck, a piston fender, a T-fender, and inner and outer seal rubbers, which takes time and effort to construct, and equipment and construction costs. Became expensive.
[0008]
Also, the constant pressure vertical operation type gas bag of the above-mentioned Patent Document 2 has a complicated folding structure of the refraction fold 2 on the peripheral side wall and is difficult to manufacture, and may be aged due to outside air, ultraviolet rays, and the like. There was a concern that it would deteriorate due to use.
[0009]
Further, the diaphragm-type gas holder of Patent Document 3 introduced above requires a large amount of construction of an outer shell having a spherical body structure, and also takes much time to form a diaphragm membrane having a spherical body structure.
[0010]
Further, since the balloon of Patent Document 4 introduced above is large and heavy, there is a concern that the load is large due to repeated vertical movement and reversal, and the durability is reduced.
[0011]
SUMMARY OF THE INVENTION An object of the present invention is to provide a membrane-type gas holder having a simple structure, low construction cost, good operability, and excellent durability. Is what you do.
[0012]
[Means for Solving the Problems]
The membrane type gas holder according to the first invention has a flat bottom membrane made of a flexible membrane material having airtightness and liquid tightness, and a cylindrical bottom membrane in a storage tank structure made of slate or metal. A side membrane and a dome-shaped roof membrane are formed in an integral-shaped bag, and a nozzle such as a gas inlet / outlet is provided on the bottom membrane of the bag, and a flare between the bottom edge of the bottom membrane and the lower edge of the side membrane is provided. Is fixed to the bottom plate using a holding plate and a screw member.
[0013]
Further, the membrane gas holder according to the second invention is provided with a round bar-shaped reinforcing member which is covered with a tubular membrane piece in a bag-binding manner at the outer peripheral edge of the lowermost portion of the side membrane. The member is provided at a position in contact with the inner side surface of the presser plate, and the outer end of the bag-binding tubular film body piece is located below the presser plate, the lower peripheral edge of the side film with the screwing member, and It was fixed together with the bottom edge of the bottom membrane.
[0014]
Further, an annular weight balancer smaller than the inner diameter of the side membrane provided with a reinforcing tape for holding the roof membrane is placed on the roof membrane upper surface, and the outside of the storage tank structure is connected to the weight balancer via a balance wire. The provision of a counter weight that hangs down on the air always ensures the pressure inside the operation in response to changes in the amount of stored gas.
[0015]
Further, a membrane cloth tab is attached to the outer peripheral portion of the side membrane at a predetermined interval, and a reinforcing member made of synthetic fiber is inserted and held in the membrane cloth tab to regulate the swelling of the side membrane. A plurality of stages are provided on the surface.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of a membrane gas holder according to the present invention will be described with reference to FIGS.
FIG. 1 shows a longitudinal section of the entire membrane type gas holder, and FIG. 2 shows an enlarged view of a fixing portion at the periphery of the bag (film) shown in FIG.
Reference numeral 1 denotes a storage tank structure serving as an outer shell, which is made of a slate having a plywood structure manufactured by mixing asbestos and cement, and a metal made by welding or panel bonding using a steel plate. The storage tank structure 1 is formed into a raised floor type flat bottom cylindrical shape by a bottom plate 2 having a circular planar shape, a cylindrical side wall 3, and a roof 4 having a conical shape or the like.
In addition, the storage tank structure 1 may be formed of a bottom plate structure which is made of concrete or the like and is simplified to be the same as the base surface, without a raised floor type bottom plate as shown in the figure.
Inside the outer shell of the storage tank structure 1, a bag 5 made of a flexible film material having a light weight and a tensile strength, which is gas-tight and liquid-tight for containing gas, is housed.
[0017]
The bag body 5 is formed into a flat bottom cylindrical dome shape integrally formed of a flat bottom film 6, a cylindrical side film 7 and a dome roof film 8 using a flexible film material. . The flexible film material forming the bag body 5 is, for example, a sheet body formed of a synthetic resin material such as a polyolefin resin, an ethylene vinyl acetate resin, a polyvinyl chloride resin, or a fiber such as a polyester fiber or a glass fiber. A sheet member having air-tightness and liquid-tightness, such as a cloth material coated with a synthetic resin such as the above-mentioned polyvinyl chloride resin, is used.
[0018]
The peripheral edge of the bottom film 6 and the lowermost peripheral edge of the side film 7 are heat-welded to each other at a welded portion 9 polymerized in a flared shape, and the welded portion 9 is located above the inner peripheral edge of the bottom plate 2 of the storage tank structure 1. And screw it on.
The spatial distance between the side film 7 and the inner surface of the side wall 3 is calculated by calculating the maximum swelling amount of the side film 7 from the degree of swelling of the film body due to the design pressure. Set. Note that the two-dot chain line in the figure shows the manufactured shape of the side film 7 in a non-pressure state.
[0019]
A gas inflow pipe 10 and a gas discharge pipe 11 into the bag body 5 are provided through the bottom plate 2 and the bottom film 6.
In the case of a structure in which the concrete foundation is directly used as the bottom slab 2 and the bottom film 6 is mounted on the upper surface of the bottom slab 2 instead of the raised floor type bottom slab 2 as shown in FIG. A pit is provided on the bottom slab 2 of the concrete foundation in order to facilitate the installation of the above-mentioned pipe in the pit.
[0020]
As shown in FIG. 2, the side wall 3 is erected on a foundation 12, and a plurality of portions are fixed to a bracket-shaped fixing member 14 fixed to a lower outer peripheral edge of the side wall 3 with an anchor member 15.
The bottom slab 2 is arranged on a support member 13A made of a mold steel material such as a channel material, fixed on a support material 13B such as an angle material fixed to the entire inner periphery of the lower portion of the side wall 3, and laid on a high floor.
Then, a bottom film 6 on the lower surface of the bag 5 is extended on the upper surface of the bottom plate 2.
[0021]
As shown in FIG. 2, the fixing portion 9 of the bag body 5 is formed such that the lowermost peripheral edge of the side film 7 is bent outward at the peripheral edge of the bottom film 6 and welded in a flared shape. A flat band substantially fan-shaped annular covering film 16 is coated and welded on the peripheral edge to ensure airtightness.
A tubular film piece 19 obtained by bending a film piece into a bag shape is formed on the upper part of the annular covering film 16, and a round bar-shaped reinforcing member 20 such as a wire rope is inserted into the tubular film piece 19. .
Then, flared welding portions at the peripheral edge of the bottom film 6 and the peripheral edge of the side film 7, an annular covering film 16 having a substantially band-like fan shape, and a tubular film The outer end of the body piece 19 is inserted, and a band-shaped pressing plate 17 is superposed thereon, inserted through the bolt, and the whole is tightened from above with a nut.
As described above, the fixing portion 9 of the bag body 5 is integrally fixed by the screw member 18 of the bolt and the nut.
[0022]
The tubular membrane piece 19 abuts against the side membrane 7 so as to flexibly bend by the swelling of the bag body 5, and the lowermost side membrane due to the internal pressure is generated by the fastening force of the internal round bar-shaped reinforcing member 20. Of the welded portion 9 between the bottom film 6 and the side film 7 can be prevented.
Further, the holding plate 17 is in contact with the side surface of the reinforcing member 20 via the bag-binding tubular film piece 19 to prevent the reinforcing member 20 from spreading and moving, and furthermore, the bag-binding tubular film piece 19. , The upward movement of the reinforcing member 20 can be prevented. In this manner, the reinforcing member 20 is always held at a predetermined position, and the separation of the welded portion 9 between the bottom film 6 and the side film 7 can be prevented. Therefore, safety can be ensured even in the case of a high internal pressure.
[0023]
As shown in FIG. 3, a reinforcing tape 25 is laid out on the upper surface of the dome-shaped roof film 8 of the bag body 5 substantially radially from the zenith. The reinforcing tape 25 is made of a synthetic fiber material such as a polyester fiber having a flat band shape, a higher rigidity than the material of the membrane, and a similar elongation.
An annular weight balancer 21 made of a pipe material having an outer diameter smaller than the inner diameter of the side membrane and having a weight corresponding to the designed pressure is mounted on the outer peripheral position of the roof membrane 8. Connect the edges.
The reinforcing tape 25 on the upper surface of the roof membrane 8 keeps the balance of the annular weight balancer 21, reduces the tension generated in the roof membrane 8 due to the internal pressure, and suppresses expansion.
In addition, the two-dot chain line in the figure has shown the manufacturing shape of the bag body 5 in a non-pressure state.
[0024]
Then, the distal end of the balance wire 22 is connected to a plurality of upper portions of the weight balancer 21, symmetrical positions, and extends from the balance wire 22 to the outer surface of the storage tank structure 1 via a plurality of pulleys 23 and hangs down. A counterweight 24 is provided at the tip.
By changing the weight of the counterweight 24, the pressure inside the operation can be changed or adjusted. In addition, a level gauge is provided to measure the gas storage capacity from the outer surface of the storage tank structure according to its height. can do.
[0025]
Using the weight balancer 21, the balance wire 22, and the counterweight 24, the bag body 5 is stably moved up and down, and the pressure inside the operation is always secured in response to the change in the gas storage amount. The operating pressure is usually a relatively low pressure of 500 mm or less in a water column.
[0026]
As shown in FIG. 4, a plurality of membrane cloth tabs 26 are fixed to the outer periphery of the side membrane 7 at intervals with a hollow shape, and a synthetic fiber strip or a synthetic fiber band is formed in the hollow part of the membrane cloth tab 26. The reinforcing member 27 having a rope shape or the like is inserted and disposed in a horizontal ring shape.
The reinforcing member 27 has the same outer diameter as that of the side film 7 and is provided in a plurality of stages in a horizontal ring shape on the outer peripheral surface of the side film 7 as shown in the figure. Alternatively, although not shown, they are continuously provided in a diagonal spiral shape, or provided in a plurality of stages separated from each other after being crossed.
[0027]
As described above, by providing the reinforcing member 27 on the outer peripheral surface of the side film 7, the strength of the side film 7 is increased, the swelling is restricted, the contact with the inner surface of the side wall is prevented, and the side film 7 cannot be deformed in the horizontal direction. It does not give a strong pulling force and allows natural folding in the vertical direction.
[0028]
【The invention's effect】
The membrane type gas holder according to the first invention has a flat bottom membrane made of a flexible membrane material having airtightness and liquid tightness, and a cylindrical bottom membrane in a storage tank structure made of slate or metal. A side membrane and a dome-shaped roof membrane are formed in an integral-shaped bag, and a nozzle such as a gas inlet / outlet is provided on the bottom membrane of the bag, and a flare between the bottom edge of the bottom membrane and the lower edge of the side membrane is provided. Is fixed to the bottom slab using the holding plate and screw member, so that the membrane is located in the storage tank structure and is not exposed to sunlight or the outside air, so there is no deterioration due to ultraviolet light and strong wind Therefore, it is possible to prevent the collapse of the film body and the damage due to flying objects, and to ensure safety and durability.
In addition, since the bag body has a flat bottom cylindrical shape, when the storage capacity is large, it can be dealt with by increasing the side membrane, and it can be installed economically on a small site.
In addition, since the bottom film has a flat shape and is placed on the bottom plate, the stress generated by the internal pressure is received by the bottom plate through the bottom film, so that no tension is generated in the bottom film, and the bottom film is further attached to the bottom plate. Tensile stress and repetitive stress due to internal pressure fluctuation do not occur in the bottom film of the nozzle mounting portion, and safety can be improved.
In addition, the membrane can be integrally molded at the factory and fixed on the bottom slab at the fixing part of the outer peripheral edge of the bottom membrane at the site.Since it can be easily mounted in low places, it is safe and shortens the construction period. And economic efficiency can be improved.
Furthermore, the film body of the bag body is made of a commercially available lightweight flexible film material having airtightness, and the peripheral edge of the bottom film and the peripheral edge of the lower side of the side film are formed into a flared welded portion. The membrane and roof membrane are integrally molded, and finally the lap welded part is easily heat welded from the outer surface, so no special equipment is required, it is easy and easy, workability is good, and it is economical without labor. can do.
[0029]
Further, the membrane gas holder according to the second invention is provided with a round bar-shaped reinforcing member which is covered with a tubular membrane piece in a bag-binding manner at the outer peripheral edge of the lowermost portion of the side membrane. The member is provided at a position in contact with the inner side surface of the presser plate, and the outer end of the bag-binding tubular film body piece is located below the presser plate, the lower peripheral edge of the side film with the screwing member, and Since it is fixed together with the peripheral edge of the bottom film, the round bar-shaped reinforcing member can suppress the spread of the lowermost portion of the side film due to the internal pressure, and can prevent the welded portion between the bottom film and the side film from peeling.
Also, the holding plate is in contact with the reinforcing member through a bag-binding tubular film piece on the inner side surface of the holding plate, which can prevent the reinforcing member from spreading and moving, and further press the bag-binding tubular film piece. As a result, the upward movement of the reinforcing member can be prevented, and thus the reinforcing member is always held at a predetermined position, so that the welded portion between the bottom film and the side film can be prevented from peeling off. In this case, safety can be ensured.
[0030]
Further, an annular weight balancer smaller than the inner diameter of the side membrane provided with a reinforcing tape for holding the roof membrane is placed on the roof membrane upper surface, and the outside of the storage tank structure is connected to the weight balancer via a balance wire. By installing a counterweight that hangs down on the roof membrane, the pressure inside the operation is always ensured in response to changes in the gas storage volume, so the reinforcing tape on the roof membrane can maintain the balance of the annular weight balancer while maintaining the internal pressure. Can reduce the tension generated on the roof membrane, thereby suppressing the expansion that tends to spread upward.
In addition, because the weight balancer and the counterweight always apply a predetermined load corresponding to the internal operation pressure to the roof membrane, even when the gas storage amount is small, the predetermined operation pressure can be secured, and the gas generation amount can be reduced. Applicable to unstable gas production facilities.
Furthermore, by changing the weight of the weight of the counterweight, the pressure inside the operation can be changed and adjusted, and a level gauge is provided to measure the gas storage capacity from the outer surface of the storage tank structure according to its height position. You can also.
[0031]
Further, a membrane cloth tab is attached to the outer peripheral portion of the side membrane at a predetermined interval, and a reinforcing member made of synthetic fiber is inserted and held in the membrane cloth tab to regulate the swelling of the side membrane. Because the surface is provided with a plurality of stages, the tension generated in the side membrane due to the internal pressure is partially borne by the reinforcement member, and the tension generated in the side membrane can be reduced by the plurality of stages of the reinforcing member. Since the safety can be improved and the capacity can be increased by increasing the height of the side membrane, it can be applied to large-capacity gas storage and high-pressure storage.
In addition, the reinforcing member is made of a synthetic fiber material having a higher rigidity than the flexible membrane material but a similar elongation, so that the swelling between the reinforcing members can be reduced. When the side membrane is folded, it can be naturally folded in the vertical direction without being deformed in the horizontal direction, so that the space between the side membrane and the inner surface of the side wall can be narrowed, and it can be installed even on a narrow site.
[0032]
[Brief description of the drawings]
FIG. 1 is an explanatory longitudinal sectional view showing an embodiment of a membrane gas holder according to the present invention.
FIG. 2 is an enlarged vertical cross-sectional explanatory view showing a vicinity of a fixing portion of a lower peripheral edge of the bag body of FIG. 1;
FIG. 3 is an explanatory longitudinal sectional view showing a state in which a reinforcing tape, a weight balancer, and the like are provided on a roof membrane.
FIG. 4 is an explanatory longitudinal sectional view showing a case where a plurality of membrane cloth tabs and a reinforcing member for a horizontal ring are provided on an outer peripheral portion of a side membrane.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Storage structure 2 Bottom plate 3 Side wall 4 Roof 5 Bag (film body) 6 Bottom film 7 Side film 8 Roof film 9 Fixing part 10 Supply pipe 10A Inlet nozzle 11 Discharge pipe 11A Outlet nozzle 12 Foundation 13A Supporting material 13B Supporting material 14 Fixing material 15 Anchor material 16 Annular covering film 17 Pressing plate 18 Screwing member 19 Cylindrical film piece 20 Reinforcement member 21 Weight balancer 22 Balance wire 23 Pulley 24 Counter weight 25 Reinforcement tape 26 Membrane cloth tab 27 Reinforcement member

Claims (4)

A flat bottom membrane, a cylindrical side membrane, and a dome-shaped roof membrane are integrated with a gas-tight and liquid-tight flexible membrane material in a slate or metal storage tank structure. A nozzle, such as a gas inlet / outlet, is formed on the bottom film of the bag body, and a flared welded portion between the peripheral edge of the bottom film and the lowermost peripheral edge of the side film is formed by a pressing plate and a screw member. A membrane type gas holder characterized by being fixed to a bottom plate by using a film. At the outer peripheral edge of the lowermost portion of the side film, a round bar-shaped reinforcing member covered in a bag binding shape with a tubular film piece is provided, and the round bar-shaped reinforcing member is provided at a position in contact with the inner surface of the holding plate. At the same time, the outer end of the bag-bound cylindrical membrane body piece is fixed to the lower part of the holding plate together with the lowermost peripheral edge of the side membrane and the peripheral edge of the bottom membrane by the screwing member. Item 7. A membrane gas holder according to Item 1. On the upper surface of the roof membrane, an annular weight balancer smaller than the inner diameter of the side membrane provided with a reinforcing tape for holding the roof membrane is placed, and is suspended outside the storage tank structure via a balance wire coupled to the weight balancer. 3. The membrane gas holder according to claim 1, wherein a counter weight is provided so as to always maintain the internal operation pressure in response to a change in the gas storage amount. A membrane cloth tab is attached to the outer peripheral portion of the side membrane at a predetermined interval, a reinforcing member made of synthetic fiber is inserted into the membrane cloth tab and held to regulate the swelling of the side membrane, and the reinforcing member is attached to the outer peripheral surface of the side membrane. The membrane gas holder according to claim 3, wherein a plurality of stages are provided.

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