Double-section membrane sealing type gas holder transformed from polygonal gas holder

Abstract

The invention relates to a double-section membrane sealing type gas holder transformed from a polygonal gas holder, and is characterized by belonging to the field of variable volume gas storage engineering. A part of a side plate of an existing polygonal gas chamber barrel is used as a supporting structure of a piston rubber sealing film, and a vertical plate with a support and a stiffening is arranged at the position of each corner stand column of the polygonal gas chamber (hereinafter referred to as a polygonal chamber) to serve as the supporting structure of the corner piston rubber sealing film. The vertical plate is connected with the original side plates on the two sides of the stand column in the horizontal direction, and the vertical plate is arranged in the vertical direction from the position of the sealing angle steel on the side wall of the membrane sealing gas chamber to the supporting height of the rubber membrane at the corner position of the polygonal chamber when the piston is in the maximum stroke, and is used for supporting the sealing rubber membrane. The sectional area and stroke of an original cabinet piston, a foundation, a bottom plate and a barrel structure can be fully utilized, investment is saved, construction and installation are convenient, and ventilation and inspection lighting conditions in the cabinet are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of variable volume gas storage engineering, and discloses a two-stage membrane-sealed gas holder transformed from a polygonal gas holder. Background Art

[0002] Polygonal gas holders (i.e., Man-type gas holders) are a type of oil-sealed gas holders. They use oil and steel slide plate piston sealing methods, and the cylinder has a regular polygonal appearance. Since Baosteel introduced Man-type gas holders from Japan in 1979 for storing coke oven gas, polygonal gas holders have developed rapidly in China and are widely used by various steel companies. However, due to insufficient installation accuracy and other reasons, many polygonal gas holders have problems such as piston tilt, piston guide wheel jamming, and large oil leakage during operation. In addition, the maximum operating speed of the piston is difficult to meet the needs of the gas pipeline network of the entire plant for the online operation of the gas holder. The metallurgical industry has seen a market demand for transforming polygonal gas holders into rubber membrane sealed gas holders.

[0003] Take a polygonal blast furnace gas tank with a capacity of 150,000 m3 and an operating pressure of 8 kPa built by a steel plant more than ten years ago as an example. The gas tank has 24 columns, the diameter of the circumscribed circle of the side plate is 53.629m, the diameter of the inscribed circle of the side plate is 53.170m, the side length of the side plate is 7m, the horizontal cross-sectional area of ​​the gas tank is 2233m2, and the piston stroke is 67.2m. The height of the side plate is 82.965m, and the height-to-diameter ratio of this gas tank is 82.965 / 53.629=1.547. If it is transformed into a one-stage membrane sealed gas tank, based on the current domestic membrane manufacturing length of ~23m, the tank capacity after the transformation is about 100,000 m3, which has the advantage of stable gas storage pressure; if it is transformed into a two-stage membrane sealed converter gas tank with an operating pressure of ~3kpa to store converter gas, the tank capacity after the transformation is about 130,000 to 140,000 m3. It can be seen that the cabinet capacity utilization rate of the two-stage renovation plan is higher than that of the one-stage renovation plan. Therefore, the biggest advantage of the idea of ​​transforming the polygonal cabinet into a two-stage membrane sealed cabinet is that both the cabinet cross-sectional area and the cabinet capacity utilization rate are the highest.

[0004] The relevant technologies for transforming existing polygonal gasholders into membrane-sealed gasholders are as follows: Patent No. CN201510943133.7 "Method of transforming a polygonal thin oil-sealed dry gasholder into a single-stage rubber membrane-sealed dry gasholder" adds a circle of circular inscribed side panels based on the inscribed circle diameter of the original polygonal cabinet side panel, and the height of the circular inscribed side panel is twice the height of the piston bracket. Patent No. CN201510944177 "Method for Rebuilding Polygonal Thin Oil Sealed Dry Gas Holder into Double-stage Rubber Membrane Sealed Dry Gas Holder" has similar technology to CN201510943133.7, with the inner cylinder side plate and outer membrane stroke height; Patent No. CN201610285866 "Single-stage Rubber Membrane Sealed Gas Holder Reconstructed from Man-type Gas Holder" provides a method for reconstructing an existing small-capacity polygonal gas holder, in which a sleeve with a circular horizontal cross-section is provided at the middle 1 / 3 of the height of the polygonal cabinet side plate, and the sleeve is supported on the original polygonal gas holder cylinder. Patent No. CN201610285854 "Reconstruction Method for Reconstructing Single-stage Rubber Membrane Sealed Gas Holder from Regular Polygonal Thin Oil Sealed Gas Holder" refines the support of the inner cylinder into a number of bracket support types, but the disadvantage is that the effective horizontal cross-sectional area of ​​the gas holder is greatly reduced. Patent No. CN201610285816.2 "Method for Reconstructing Regular Polygonal Thin Oil Sealed Gasholder" also uses an inner cylindrical rubber sealing membrane support structure with several brackets. Patent No. CN201710235175 "Single-stage rubber membrane sealed gasholder reconstructed from regular polygonal thin oil sealed gasholder" uses the inner circular sleeves of several brackets as the rubber sealing membrane support structure and the arched piston to transform the polygonal gasholder, and the lower end of the inner circular sleeve is sealed and connected to the side panel of the polygonal gasholder. CCID Patent No. 201921354526 "A single-stage membrane sealed gasholder reconstructed from a polygonal gasholder" uses the original side panel as part of the cylinder of the new cabinet, maximizing the use of the cylinder cross-sectional area and saving investment.

[0005] Using the original side panel as part of the cylinder of the new cabinet can achieve efficient use of the cross-sectional area of ​​the gas cabinet. The sealing angle steel on the side panel is a polygon with a plane shape that is twice the number of columns, and has 2 times the straight or arc-shaped edges. This can effectively utilize the cross-sectional area of ​​the cylinder, and the sealing rubber film can cover the cylinder more evenly, thereby extending the service life of the sealing rubber film.

[0006] In the above-mentioned polygonal gas tank reconstruction example, the original gas tank had an operating pressure of 8kPa, and was rebuilt into a two-stage membrane-sealed converter gas tank with an operating pressure of about 3kPa. Logically, both the foundation and the bottom plate should be able to withstand it. However, since the concrete ring beam below the oil groove at the bottom of this polygonal gas tank is about 1.1m wide and is about 2.4 to 2.7m wide from the reference line of the inner wall of the cabinet side panel, the two-stage membrane-sealed gas tank has a concrete ring beam below the T-baffle pedestal and the piston concrete dam, and the width is generally more than 3m. If the existing foundation can withstand the impact force on the foundation when the piston with the concrete dam falls, the foundation and the bottom plate can be reused, which will greatly reduce the reconstruction cost. Summary of the invention

[0007] In view of this, the purpose of the present invention is to provide a two-stage membrane sealing cabinet that maximizes the use of the polygonal cabinet piston cross-sectional area and piston stroke, makes full use of the existing foundation, bottom plate and side plate columns and other cylinders, and achieves maximum cabinet capacity utilization and economy of the two-stage membrane sealing cabinet for the transformation of the polygonal gas tank within the existing rubber sealing membrane production length range.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] A two-stage membrane-sealed gas tank modified from a polygonal gas tank, the polygonal gas tank comprising a cylinder body with a regular polygonal cross section formed by welding a plurality of bent stiffening side panels and a plurality of columns, the bottom of the cylinder body comprising a foundation ring beam, a central bottom plate foundation, and a bottom oil groove; a central bottom plate is arranged on the basis of the central bottom plate, and a bottom oil groove vertical plate is arranged on the side of the bottom oil groove; a piston and a piston ring beam support leg are arranged above the central bottom plate; a central bottom plate drain pipe, a displacement vent pipe, an oil riser pipe, and an oil pump station are arranged on the central bottom plate; a high-position oil tank is arranged on the top of the cylinder body; a cabinet top is arranged on the top of the cylinder body,

[0010] During the reconstruction process, the piston and piston ring beam legs are removed, the position of the bottom oil ditch vertical plate above the bottom plate is cut off to form a bottom ditch, the oil pump station is removed and its water inlet pipe is converted into a bottom ditch drainage pipe, the oil riser is removed, and the high-level oil tank is converted into a ventilation window; a vertical plate with support and reinforcement is set at the column position of the polygonal gas tank as a support structure for the corner piston rubber sealing membrane, the vertical plate is connected to the side plates on both sides of the column in the horizontal direction, and is set from the position of the membrane sealing gas tank side wall sealing angle steel to the support height of the rubber membrane at the corner position of the polygonal cabinet when the piston has the maximum stroke in the vertical direction, which is used to support the sealing rubber membrane, and the support structure of the sealing rubber membrane on the polygonal gas tank cylinder is a polygonal cylinder composed of the original side plates and the corner rubber membrane support plates with twice the number of sides of the original polygonal gas tank.

[0011] A part of the existing polygonal gas tank cylinder side plate is used as the support structure of the piston rubber sealing membrane. A vertical plate with support and reinforcement is set at each corner column position of the regular polygonal gas tank (hereinafter referred to as the polygonal tank) as the support structure of the corner piston rubber sealing membrane. The vertical plate is connected to the original side plates on both sides of the column in the horizontal direction. In the vertical direction, the vertical plate is set from the sealing angle steel position of the membrane sealing gas tank side wall to the support height of the rubber membrane at the corner position of the polygonal tank when the piston has the maximum stroke, and is used to support the sealing rubber membrane.

[0012] Furthermore, the sealing angle steel on the side panel is a polygon with a plane shape twice the number of columns, and has two more straight or arc-shaped edges, so that the sealing rubber film covers the cylinder more evenly, which can extend the service life of the sealing rubber film.

[0013] It can be seen that the support structure of the piston rubber sealing membrane on the side panel and the side panel sealing angle steel, which has a plane shape with 3 times the number of sides of the original polygonal gas tank, can use not only straight edges but also curved edges, as long as the sealing rubber membrane sealing angle steel and the supporting structure on the side panel around the plane are as close to a circle as possible.

[0014] Correspondingly, a sealing plate is arranged in the height direction of the original polygonal cabinet side plate to which the side plate sealing angle steel is installed to block the connection gap between the side plate and the column, so as to prevent gas from leaking into the air space.

[0015] Furthermore, the polygonal cabinet body foundation is basically reused, using the existing foundation ring beam, a T baffle stand is set on the reused bottom oil groove bottom plate and a piston concrete dam is set on the central bottom plate above the foundation ring beam. The specific plan is as follows:

[0016] Cut off the bottom plate oil groove baffle above the height of the upper weld of the bottom plate oil groove baffle and the central bottom plate lap angle steel, and set a T-baffle stand in the bottom oil groove.

[0017] Furthermore, the bottom oil ditch baffle plate higher than the central bottom plate is removed, and a piston concrete dam is provided on the central bottom plate inside the bottom oil ditch baffle plate above the existing foundation ring beam.

[0018] Furthermore, a sealing channel steel for connecting and fixing the sealing rubber membrane is arranged above the outer frame of the piston concrete dam.

[0019] Furthermore, a water seal is installed at the bottom oil ditch outlet of the crude oil pumping station on the side wall plate or at the bottom oil ditch drain pipe to automatically drain the original water in the bottom oil ditch. At the same time, a U-shaped drainage water seal is installed and modified to drain the water in the bottom oil ditch of the original gas tank using the crude oil pumping station water pit; the central bottom plate drainage water seal can be reused.

[0020] Furthermore, the side panels of the upper part of the cabinet body of the polygonal oil-sealed gas tank are generally provided with skylights, and each column of the cabinet top plate is generally provided with skylights to facilitate the inspection of the piston. After the transformation into a membrane-sealed gas tank, the rubber sealing membrane is prone to aging under sunlight, so the previous skylights are closed, and the gas tower on the cabinet top is also appropriately modified to prevent sunlight from entering the bottom of the cabinet top. In order to facilitate the inspection of the piston inside the cabinet, a piston lighting lamp is installed around the cabinet top.

[0021] In order to adapt to the lifting installation of the rubber membrane, installation holes for the lifting sealing rubber membrane are provided around the top of the cabinet. During normal inspection of the gas cabinet, the cover can be opened to serve as ventilation holes inside and outside the cabinet.

[0022] Furthermore, in order to adapt to the fast piston speed of the membrane-sealed gas tank, ventilation holes are provided on the side panels of the cylinder, and the ventilation holes have the function of preventing sunlight and rain from entering.

[0023] Furthermore, in order to reduce the difficulty of rescuing personnel and quickly evacuate personnel in the event of an internal cage failure, a side panel door directly connected to the piston is provided at an appropriate position on the side panel on the corridor above the position where the sealing angle steel is arranged.

[0024] Furthermore, the original emergency relief pipe can be reused, and its function is changed to a ventilation pipe that can prevent rainwater and sunlight from entering the piston.

[0025] Furthermore, the original mechanical cabinet meter remote range and on-site dial range can be reused after adjustment.

[0026] The beneficial effects of the present invention are:

[0027] The present invention makes maximum use of the cross-sectional area of ​​the existing polygonal cabinet body, and at the same time, regularizes the supporting structure of the sealing rubber membrane on the side plate into a circle as much as possible, adopts measures to avoid natural light, etc., to extend the service life of the sealing rubber membrane; arranges a two-stage piston ground foundation within the width of the existing foundation ring beam, greatly reducing the amount of foundation engineering; and the matching piston sealing angle steel is arranged just above the outer frame of the piston concrete dam. The present invention provides a method for realizing the transformation of a polygonal cabinet into a two-stage membrane sealing cabinet, which maximizes the use of cabinet capacity, saves investment, is convenient for construction and installation, and has good ventilation and inspection lighting conditions in the cabinet.

[0028] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0030] Figure 1 This is the elevation diagram of the original polygonal gas tank structure;

[0031] Figure 2 This is a schematic elevation diagram of the polygonal membrane sealed gas tank structure of the present invention.

[0032] Figure 3 for Figure 2 The AA section is a horizontal cross-sectional view of the original gas tank cylinder at the height at which the second section of the rubber sealing film is subjected to pressure;

[0033] Figure 4 for Figure 3 Part I of the large-scale drawing;

[0034] Figure 5 for Figure 4 Schematic diagram of some structures;

[0035] Figure 6 for Figure 4 The BB section is a schematic diagram of the connection between the rubber membrane support plate at the root (corner) of the column and the corner sealing plate;

[0036] Figure 7 for Figure 4 DD section, i.e. the cross section diagram of the lap joint between the rubber membrane support plate at the root (corner) of the column and the original side plate;

[0037] Figure 8 for Figure 4 EE section, i.e. the section of the side plate sealing angle steel at the original side plate supporting the sealing rubber membrane;

[0038] Fig. 9 for Figure 6 FF section;

[0039] Fig.10 for Figure 4 Part II of the large-scale drawing.

[0040] Figure numerals: 1 foundation ring beam; 2T baffle stand; 3 bottom ditch vertical plate; 4 piston support frame; 5 central bottom plate foundation; 6 central bottom plate; 7 piston includes: 7-1 piston plate, 7-2 cage landing platform, 7-3 piston concrete dam, 7-4 piston sealing channel steel, 7-5 piston rubber sealing membrane, 7-6 piston rubber sealing membrane support frame; 8 cabinet corridor; 9 cylinder side plate is composed of 9-1 side plate, 9-2 column sealing angle steel support, 9-3 column side sealing angle steel support 1. 9-4 column sealing rubber membrane support plate, 9-5 column side sealing angle steel support 2. 9-6 side plate lap edge sealing angle steel support plate, 9-7 side plate sealing partition, 9-8 column transition support, 9-9 column sealing angle steel sealing plate, 9-10 column sealing angle steel, 9-11 corner and edge lap edge sealing angle steel transition support, 9-12 corner and edge lap edge sealing angle steel and 9-13 edge sealing angle steel; 10 column; 11 central bottom plate drainage pipe ; 12 Blind plate 1; 13 Blind plate 2; 14 Bottom ditch drainage pipe; 15 Lower manhole; 16 External elevator; 17 External inclined ladder; 18 Mechanical cabinet meter; 19 Side panel door; 20 Side panel ventilation hole composed of 20-1 rain cover and 20-2 wire mesh; 21 High-position ventilation pipe; 22 High-position ventilation box; 23 Side panel lighting window closed; 24 High-position ventilation window; 25 External elevator shaft; 26 Ventilation hole; 27 Lighting lamp holder; 28 Cabinet top railing; 29 Cabinet top including 29-1 cabinet top plate , 29-2 cabinet top truss and 29-3 cabinet top skylight; 30 is automatic gas release pipe; 31 is cabinet top gas tower, 32 internal cage; 33 hand-cranked rescue bag; 34 the second section of the sealing device is composed of 34-1 the fixing and guiding device at the sealing angle steel on the side panel and 34-2 the second section of the sealing rubber membrane; 35 is the T baffle is composed of 35-1 corrugated plate, 35-2 T baffle bracket, 35-3 sealing angle steel, 35-4 sealing channel steel, etc.; 36 is the first section of the rubber sealing membrane.

[0041] In the figure, n is the number of columns or sides of the regular polygonal cabinet; h is the piston stroke of the original polygonal cabinet; H is the piston stroke of the membrane sealing cabinet; D is the diameter of the circumscribed circle of the original polygonal cabinet side panel; d is the diameter of the inscribed circle of the original polygonal cabinet side panel; a: air area; g: gas area; α: the angle between the side panels of the polygonal cabinet; β: the angle between the sealing rubber membrane support plate of the side panel 9-1 and the column part 9-4; γ: the angle between the sealing rubber membrane support plate of the column part 9-4 and the sealing angle steel support plate of the overlapping edge of the side panel 9-6. DETAILED DESCRIPTION

[0042] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0043] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0044] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0045] See also Figures 1 to 10 , the existing polygonal gas tank is as follows Figure 1 As shown, the gas tank cylinder is welded by a plurality of bent stiffening side plates 9 and a plurality of columns 10 to form a regular polygonal cross-section, so it is called a regular polygonal gas tank. The regular polygonal cylinder side plates are a plurality of bent stiffening side plates 9 connected in the height direction as outer lap welds (see Figure 4 ), the bent stiffening side plate 9 is overlapped and welded on the column 10 (see Figure 3), the cylinder body is sealed with gas by a weld, the piston moves up and down in the cylinder body of the gas tank, the piston sealing device is installed in the piston oil groove and a certain height of sealing oil is poured into it to achieve reliable sealing of the gas; the sealing oil leaked from the piston sealing device is mixed with gas condensate and enters the bottom oil groove, the sealing oil and condensate flowing from the bottom oil groove enter the oil pump station through the oil inlet pipe and the water inlet pipe respectively, and the oil and water are automatically separated after multiple static standing at the oil pump station, and the gas condensate is discharged out of the cabinet. The sealing oil after the oil and water are separated by static standing is sent to the high-level oil tank through the oil pump and the oil riser, and then naturally overflows through the overflow port of the high-level oil tank on the side plate 9 into the inner wall of the side plate 9 to replenish the oil level of the piston oil groove, thereby ensuring the sealing performance of the piston.

[0046] The bottom plate of the bottom oil groove is generally lower than the central bottom plate 6 and the height of the bottom oil groove vertical plate exceeds the bottom plate by a certain height, so that the bottom oil groove can store a part of the sealing oil when the sealing oil of the piston sealing device is removed.

[0047] The gas condensate on the central bottom plate 6 of the gas cabinet is automatically discharged out of the cabinet through the central bottom plate drainage pipe 11. When the gas cabinet is replaced and purged, the replacement discharge pipe led out from the low side plate 9 is used to discharge unqualified gas.

[0048] During installation and maintenance, personnel enter the bottom of the piston from the lower manhole 15 and enter the top of the piston from the lower manhole 16; inspection and maintenance personnel go to the top of the cabinet through the external inclined ladder 17 or the external elevator shaft 25, and then enter and exit the piston through the internal cage 32 inside the cabinet top air tower 31 or the hand-cranked emergency rescue device 33.

[0049] Taking the above-mentioned polygonal blast furnace gas tank with a tank capacity of 150,000 m3 and an operating pressure of 8 kPa as an example, the gas tank has 24 columns, corresponding to α of 15°; the side plate circumscribed circle diameter D: 53.629m, the side plate inscribed circle diameter d: 53.170m, the side plate side length 7m, the side plate thickness 6mm, and the piston stroke h: 67.2m. After the transformation into a membrane sealed gas tank, the side plate circumscribed circle diameter D and the inscribed circle diameter d remain unchanged, the piston stroke becomes H, β is 7.5°; γ is 3.75°.

[0050] After transformation into membrane sealed gas tank, the foundation ring beam 1 is reused; the central bottom plate 5 foundation is reused; the bottom oil groove is transformed into a bottom water groove, and the groove formed by the bent stiffened side plate 9, the bottom oil groove bottom plate, and the bottom oil groove vertical plate 6 that is cut off and higher than the central bottom plate 5 is reused as the bottom water groove to collect the gas condensate from the upper space; the piston ring beam legs need to be removed; the central bottom plate is reused; the bottom oil groove vertical plate, cut off the part that is higher than the central bottom plate and reuse it; all pistons are removed and rebuilt; The corridor 8 is reused; the side plate 9 is reused; the column 10 is reused; the central bottom plate drainage pipe 11 is reused; the replacement vent pipe is removed and its opening on the side plate is sealed with a blind plate; the oil riser is removed; the oil pump station, after removing the oil pump station box, the oil inlet pipe is sealed with a blind plate, and its water inlet pipe is transformed into an automatic drainage pipe for the bottom ditch; the lower manhole 15 is reused to facilitate maintenance personnel to enter under the piston; the upper manhole is deactivated; the external elevator 16 is reused; the external inclined ladder 17 is reused; the mechanical cabinet meter 1 8 The readings displayed on the modified instrument panel match the capacity of the new cabinet; the emergency relief pipe can be retained and reused as a ventilation pipe; the high-level oil tank can be retained and reused as a ventilation box; the side panel skylight is closed and out of use, and the blind plate after the glass is removed can be removed to prevent light from entering the cabinet; the side panel ventilation hole 20 is reused; the external elevator shaft 25 is reused, and the safety relief pipe can be removed because the newly built automatic relief pipe of the membrane sealed cabinet has the functions of purging and releasing and automatically releasing the excess gas in the cabinet after the piston exceeds the maximum stroke. It can be retained when the layout is convenient to achieve a higher piston top protection safety factor; the cabinet top railing 28 is reused; the cabinet top plate 29-1 and the cabinet top truss 29-2 are both reused, and the cabinet top window needs to be closed and out of use. The blind plate after the glass is removed can be removed to prevent light from entering the cabinet; the cabinet top air tower 31 is reused; the internal cage 32 and the manual rescue bag 33 are both reused to provide access and escape routes for the inspection and maintenance personnel on the newly built piston.

[0051] If the emergency relief pipe is removed, the opening on the side plate 9 can be closed with a blind plate, or the opening on the side plate can be transformed into a structure similar to the ventilation hole 20 of the new cabinet. Similarly, if the high-level oil tank is removed, the opening on the side plate 9 can be closed with a blind plate, or the opening on the side plate can be transformed into a structure similar to the ventilation hole 20 of the new cabinet.

[0052] The best implementation scheme of the present invention for transforming the polygonal cabinet into a two-stage membrane sealed gas cabinet is shown in detail. Figure 2 to Figure 10, the newly built T-baffle bracket 2 is fixed on the bottom ditch and side plate 9-1. The bottom oil ditch vertical plate is cut off and the part higher than the central bottom plate is reused as the bottom ditch vertical plate 3. The piston support frame 4 is fixed on the central bottom plate 6 above the foundation ring beam 1. The central bottom plate foundation 5 and the central bottom plate 6 are both reused; the piston is completely newly built, consisting of a piston plate 7-1, a cage landing platform 7-2, a piston concrete dam 7-3, a piston sealing channel steel 7-4, and a piston rubber sealing membrane support frame 7-5, which is connected to the T-baffle sealing angle steel 35-3 through the first section of the rubber sealing membrane 36. The cabinet corridor 8 is reused, and the cylinder side panel 9 is modified on the original side panel 9 and the column 10. The shape of the original equipment cylinder is a regular polygon. In order to adapt to the membrane sealing, the fixing device of the rubber membrane on the cylinder side panel should be as circular as possible. Therefore, a column foot support 9-2, a plate support one 9-3 and a plate support two 9-5 are provided at the column 10 (or corner). At this time, the horizontal section of the cylinder contacted by the rubber membrane 34-2 above the sealing angle steel 9-10 becomes a 2n-gon; further, in order to make the sealing membrane on the side panel as round as possible and extend the service life of the sealing membrane, an overlapping side panel 9-6 is provided between the edge side panel 9-1 and the corner side panel 9-4. At this time, the horizontal section of the cylinder contacted by the rubber membrane 34-2 above the sealing angle steel 9-10 becomes a 4n-gon, see Figure 4 , see accordingly Figures 5 to 10 The supporting structures of the second section of the sealing rubber membrane 34-2 on the original cylinder are respectively the edge support plate 9-1, the corner support plate 9-4 and the overlap support plate 9-6. The side plate sealing angle steel corresponding to the corner sealing angle steel 9-10, the side plate overlap sealing angle steel 9-12, and the edge sealing angle steel 9-13 are used to fix the second section of the sealing rubber membrane 34-2 on the side plate 9 with the sealing membrane fixing device 34-1 (see Figure 2 ). The support of the corner sealing angle steel 9-10 on the original cylinder can be welded by the column transition support 9-8 and the column sealing angle steel sealing plate 9-9, and the support legs 9-11 and the sealing sealing plate 9-15 are arranged under the column sealing angle steel sealing plate 9-9; at the same time, in order to prevent the gas from escaping from the gap between the side plate 9-1 and the column 10 to the top of the piston, a side plate sealing partition 9-7 is arranged on the original cylinder at the height of the sealing angle steel 9-10.

[0053] In order to adapt to the rubber membrane lifting installation, the periphery of the cabinet top is provided with a mounting hole for lifting the sealing rubber membrane. During normal inspection of the gas cabinet, the cover can be opened as a ventilation hole 26 inside and outside the cabinet. When the gas enters the cabinet and starts to run, when the piston 7 rises from the 4-piston bracket, its own weight generates the first stage of gas storage pressure; when the piston 7 rises to the limit device on the upper part of the T baffle 32, the first stage of sealing rubber membrane 36 is completely attached to the inner side of the T baffle 35-2, and the piston 7 drives the T baffle 32 to leave the T baffle stand 2 and move upward together. The corresponding gas storage pressure in the cabinet becomes the second stage of gas storage pressure generated by the total weight of the T baffle 32 and the piston 7. When the piston reaches the maximum stroke H of this gas cabinet, the second stage of rubber sealing membrane 34-2 is completely pressed on 9-4, 9-6 and 9-1 above the side plate sealing angle steels 9-10, 9-12, and 9-13. Therefore, this type of gas storage tank is called a two-stage membrane sealing cabinet.

[0054] Corresponding to the two-stage piston, after calculation, the foundation ring beam 1 and the central bottom plate foundation 5 are reused, the original bottom oil ditch is transformed into a bottom water ditch, and a T-baffle stand 2 is set in the bottom water ditch, the bottom water ditch vertical plate 3 higher than the central bottom plate 6 is cut off, and the piston bracket 4 is welded on the reused central bottom plate 6, and a piston concrete dam 7-3 is set above it, and then a piston sealing channel steel 7-4 is set on the outside above the piston concrete dam 7-3, so as to facilitate the installation, fixation, inspection and maintenance of the first section of the rubber membrane 36 at the piston sealing channel steel 7-4.

[0055] Furthermore, the central bottom plate drainage pipe 11 utilizes the original pipe and is redesigned according to the gas storage pressure of the new gas tank. The interface on the cabinet side panel 9-1 of the replacement vent pipe is closed with a blind plate 12; the functions of the original replacement vent pipe, emergency vent pipe and safety vent pipe are replaced by the automatic vent pipe 30 drawn from the side panel near the corridor below the height of the side panel sealing angle steel 9-10. The automatic vent pipe 30 is drawn from an appropriate position near the cabinet corridor below the cabinet side panel sealing angle steel and is led to the cabinet top railing before being released. The automatic vent pipe valve is arranged on the corridor. When the piston exceeds the maximum stroke H, the mechanical push rod automatically opens the automatic vent pipe 30 to release the gas to prevent the piston from hitting the top; when the gas tank is replaced, the vent pipe can be manually opened to release the gas in the cabinet.

[0056] Furthermore, after the oil pump station is dismantled, the oil pump station oil inlet pipe interface on the cabinet side panel 9-1 is closed with a blind plate 13, and the oil pump station water inlet pipe interface on the cabinet side panel 9-1 is modified according to the gas storage pressure of the new gas tank; the original polygonal gas tank lower manhole is reused, and the piston under the piston can be entered for maintenance; the original inspection personnel enter and exit the gas tank piston passage facilities are reused as the external elevator room 16, external inclined ladder 17, external elevator shaft 25, internal cage 32, emergency rescue lifting device 33, and the corresponding piston is provided with an internal cage landing platform 7-2. The side panel door that can directly enter the T-frame 35 is set on the corridors of each floor of the gas tank. This is the new piston access passage set according to the characteristics of the membrane sealed gas tank.

[0057] The side panel lighting window 23 and the cabinet top lighting window 29-3 are closed to prevent sunlight from entering the cabinet to extend the service life of the sealing rubber membrane; the corresponding cabinet top 29 is provided with a ventilation hole 26, which also has the function of hoisting the sealing rubber membrane. The cabinet top 29 is provided with a lighting lamp holder 27 to illuminate the cabinet during maintenance or inspection. The high-position ventilation window 24 is reused, and together with the side panel ventilation hole 20, it meets the air inlet and outlet requirements of the membrane sealed gas tank with a large throughput. The original mechanical cabinet meter 18 remote range and on-site dial range can be reused after adjustment.

[0058] The first-stage piston 7 rises to generate the first-stage gas storage pressure, and the first-stage sealing rubber membrane 36 realizes the active connection between the 35T baffle (i.e., the second-stage piston, hereinafter referred to as the T baffle) and the piston 7. When the piston 7 rises to the limit device on the 35T baffle, the first-stage sealing rubber membrane 36 is completely pressed on the inner side of the 35T baffle under the action of air pressure, and the piston 7 drives the 35T baffle to continue to rise. The 35T baffle rises to generate the second-stage gas storage pressure, and the active seal between the 35T baffle and the side plate 9 is realized by the second-stage sealing rubber membrane 34-2. When the piston reaches the maximum stroke H, the second-stage sealing rubber membrane 34-2 is completely pressed on the edge support plate 9-1, the corner support plate 9-4 and the overlap support plate 9-6 at the corresponding positions under the action of air pressure.

[0059] According to the current manufacturing length of the sealing membrane of ~25m, the height of the first-stage piston 7 and the 35T baffle are planned to make full use of the existing piston stroke. The capacity of the gas holder after the transformation can reach about 140,000 cubic meters, which is a significant increase compared to the transformation into a single-stage membrane sealed gas holder of about 100,000 cubic meters. The existing gas tank cylinder is polygonal and has pillars protruding from the cabinet at the corners, so a 9-4 corner rubber membrane support plate 9-4 is set at the corner of the gas tank (regular polygon corner) to double the number of polygonal sides of the gas tank cylinder; optionally, a lap plate 9-6 is set between the 9-4 corner rubber membrane support plate 9-4 and the 9-1 side plate, so that the corner sealing angle steel 9-10, the wall panel lap sealing angle steel 9-12 and the edge sealing angle steel 9-13 used to fix the rubber membrane on the side plate in the horizontal plane are as smooth as possible. At the same time, the support plates 9-4, 9-6 and 9-1 of the sealing rubber membrane on the side plate in the horizontal plane are also as smooth as possible, which can effectively extend the service life of the sealing rubber membrane 34-2. The installation height of the support plates 9-4 and 9-6 of the sealing rubber membrane on the side plate is from about 100mm above the fixing device of the 34-2 rubber membrane on the cabinet to the height of the cylinder to which the sealing rubber membrane can be attached when the piston 9 has the maximum stroke, see the attached Figure 4. The support plates 9-4 and 9-6 of the sealing rubber membrane on the side panels cover the height range in which the rubber membrane may be close to the gas tank cylinder in the height direction, and are divided into several sections, with a spacing of about 10mm between adjacent sections, so as to facilitate on-site installation, welding and anti-corrosion. This is convenient for on-site adjustment of gas tanks with poor verticality of columns to ensure that the vertical surface of the vertical plate 9-4 is vertical. The support plates 9-4 and 9-6 of the sealing rubber membrane on the side panels maintain a gap of about 10mm between each section, which is conducive to installation adjustment and ventilation. In this way, the part of the sealing rubber membrane 34-2 that is close to the cylinder becomes a polygon with four times the number of sides of the original polygonal cabinet, which is specifically composed of the side panel 9-1 and the support plate 9-4, and the side panel overlap edge sealing angle steel support plate 9-6, which maximizes the use of the horizontal cross-sectional area of ​​the original polygonal gas tank, so that the volume of the large-volume polygonal cabinet after transformation is maximized under the existing sealing membrane manufacturing length limit, and saves engineering workload.

[0060] After the sealing weld construction near the sealing plate 9-9 is completed, a leakage check should be carried out.

[0061] In order to prevent gas leakage at the overlapped part of the polygonal cabinet side panel 9-1 and the column 10, the side panel sealing partition 9-7 is welded to cut off the gas in the height direction of the side panel 9-1 at the same height as the installation height of the column transition support 9-8 on the cylinder; in order to facilitate ventilation inside the membrane sealed cabinet, ventilation holes 20 are provided on the original side panel at a height above the fixing device of the rubber membrane 34-1 on the cabinet body, and the ventilation holes 20 are arranged at intervals above the partition 9-7, which is conducive to ventilation inside the cabinet and realizes faster movement of the piston than the polygonal cabinet piston.

[0062] Taking the aforementioned 150,000 m3 polygonal gas tank as an example, the horizontal cross-section is a regular 24-gon with a horizontal cross-sectional area of ​​2,233 square meters. Under the condition that the domestic manufacturing length of the sealing rubber membrane is about 25 meters, the piston stroke of the modified polygonal membrane sealed gas tank is about 45 meters, and the gas space under the cylinder sealing angle steel is fully utilized. The supporting structure of the sealing rubber membrane on the gas tank cylinder is changed to a 96-gon with a horizontal cross-sectional area of ​​about 2,219 square meters, which is equivalent to the area of ​​53.17 meters of the inscribed circle diameter of the original polygonal gas tank. If a sealing rubber membrane supporting cylinder with the same diameter as the inscribed circle diameter of the original polygonal gas tank is used to modify the gas tank, the engineering workload will be large and the ventilation conditions in the cabinet will be poor; if a sealing rubber membrane supporting cylinder that can be entered for maintenance is used, the horizontal cross-sectional area will be greatly reduced and the engineering workload will be even greater.

[0063] Other embodiments:

[0064] In addition to straight edges, the supporting structure of the piston rubber sealing membrane on the side panel and the side panel sealing angle steel, which is a plane shape with a number of sides three times the number of polygonal sides added to the original polygonal gas tank, can also use curved edges, as long as the sealing rubber membrane sealing angle steel and the supporting structure on the side panel around the plane are as close to a circle as possible.

[0065] The column base support 9-2, the plate support one 9-3 and the plate support two 9-5 can be replaced by steel sections, or the plate support one 9-3 and the plate support two 9-5 can be combined into one part.

[0066] The gas condensate in the bottom ditch can also be automatically discharged through the oil drain pipe interface at the bottom of the old cabinet by setting the water seal according to the gas storage pressure of the new cabinet.

[0067] It is also possible to avoid the old original corridor and add an automatic vent pipe valve platform to install an automatic vent pipe.

[0068] When the bottom oil ditch is transformed into a bottom water ditch, drainage holes can also be opened on the part of the baffle plate that is higher than the central bottom plate, close to the top of the central bottom plate, to reduce the engineering workload of completely removing the baffle plate that is higher than the central bottom plate.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A two-stage membrane-sealed gas tank modified from a polygonal gas tank, characterized in that: It was converted from a polygonal gas holder; The polygonal gas tank comprises a cylinder body with a regular polygonal cross section formed by welding a number of bent stiffening side plates and a number of columns, the bottom of the cylinder body comprises a foundation ring beam, a central bottom plate foundation, and a bottom oil groove; a central bottom plate is arranged on the basis of the central bottom plate, and a bottom oil groove vertical plate is arranged on the side of the bottom oil groove; a piston and a piston ring beam support leg are arranged above the central bottom plate; a central bottom plate drainage pipe, a displacement and venting pipe, an oil riser pipe, and an oil pump station are arranged on the central bottom plate; a high-level oil tank is arranged on the top of the cylinder body; a cabinet top is arranged on the top of the cylinder body, During the reconstruction process, the piston and piston ring beam legs are removed, the position of the bottom oil ditch vertical plate above the bottom plate is cut off to form a bottom ditch, the oil pump station is removed and its water inlet pipe is converted into a bottom ditch drainage pipe, the oil riser is removed, and the high-level oil tank is converted into a ventilation window; a vertical plate with support and reinforcement is set at the column position of the polygonal gas tank as a support structure for the corner piston rubber sealing membrane, the vertical plate is connected to the side plates on both sides of the column in the horizontal direction, and is set from the position of the membrane sealing gas tank side wall sealing angle steel to the support height of the rubber membrane at the corner position of the polygonal cabinet when the piston has the maximum stroke in the vertical direction, which is used to support the sealing rubber membrane, and the support structure of the sealing rubber membrane on the polygonal gas tank cylinder is a polygonal cylinder composed of the original side plates and the corner rubber membrane support plates with twice the number of sides of the original polygonal gas tank.

2. A two-stage membrane-sealed gas tank modified from a polygonal gas tank according to claim 1, characterized in that: The sealing angle steel on the side panel is based on a polygon whose plane shape is twice the number of columns, and has twice the number of straight or curved sides.

3. The two-stage membrane-sealed gas tank modified from a polygonal gas tank according to claim 1, characterized in that: The supporting structure of the sealing rubber membrane on the polygonal gas tank cylinder is a polygonal cylinder with four times the number of sides of the original polygonal gas tank, which is composed of the original side panels, the corner rubber membrane supporting panels, and the lap plates between the original side panels and the corner rubber membrane supporting panels; the sealing angle steel used to fix the sealing rubber membrane on the gas tank cylinder is also a polygon with four times the number of sides of the original polygonal gas tank.

4. The two-stage membrane-sealed gas tank modified from a polygonal gas tank according to claim 1 is characterized by: A piston support is arranged on the central bottom plate to support the piston concrete dam.

5. A two-stage membrane-sealed gas tank modified from a polygonal gas tank according to claim 4, characterized in that: A sealing channel steel is provided on the upper outer side of the piston concrete dam frame for connecting and fixing the sealing rubber membrane.

6. The two-stage membrane-sealed gas tank modified from a polygonal gas tank according to claim 1, characterized in that: The skylights on the top of the polygonal gas tank and the skylights on the upper side panels of the cylinder are closed.

7. The two-stage membrane-sealed gas tank modified from a polygonal gas tank according to claim 1, characterized in that: A piston lighting lamp is installed on the top of the cabinet.

8. The two-stage membrane-sealed gas tank modified from a polygonal gas tank according to claim 1, characterized in that: Ventilation holes are arranged on the side panels at a height above the sealing angle steel of the cabinet side panels, and side panel doors are opened on the cabinet corridor.

9. The two-stage membrane-sealed gas tank modified from a polygonal gas tank according to claim 1, characterized in that: Lead out an automatic relief pipe on the cabinet corridor at a height below the sealing angle steel of the cabinet side panel, and lead it to the high cabinet top for relief.

10. The two-stage membrane-sealed gas tank modified from a polygonal gas tank according to claim 1, characterized in that: Cut off the bottom plate oil groove baffle above the height of the upper weld of the bottom plate oil groove baffle and the central bottom plate lap angle steel, and set a T-baffle stand in the bottom oil groove.

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