Inner tank structure of chemical storage tank

Abstract

The utility model discloses an inner tank structure of a chemical storage tank, and belongs to the technical field of organic synthesis. Comprising a concrete foundation, a steel tank body, a ring beam, a heat preservation layer and a sand cushion layer, and the steel tank body comprises a tank bottom and a tank wall; the outer edge of the tank bottom extends outwards relative to the tank wall to form a flange, and the edge is arranged on the ring beam; the thermal insulation layer and the sand cushion layer are sequentially arranged from bottom to top, are arranged between the concrete foundation and the tank bottom and are filled in the ring beam; the thickness of the tank bottom is gradually reduced from the edge to the center, the tank bottom gradually inclines downwards from the edge to the center, and the inclination angle is 1 / 100-1 / 140; the tank wall is gradually thickened from top to bottom, and a plurality of anchoring metal belts are arranged between the outer side of the lower part of the tank wall and the concrete foundation; the anchoring metal belt is vertically arranged, the lower end of the anchoring metal belt is embedded in the concrete foundation, and the upper portion of the anchoring metal belt is bent towards the steel tank body and fixed to the lower portion of the tank wall. The structure is simple, the pressure test is qualified, and the edge of the tank bottom is not warped.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of organic synthesis, in particular to the inner tank structure of chemical industry storage tank, and especially to the inner tank structure of low temperature storage tank. BACKGROUND

[0002] At present, low temperature storage tank is mainly divided into single container tank, double container tank and full container tank three types, and the full container type storage tank is composed of inner tank and outer tank, and the two together constitute a complete storage tank, the inner tank is a self-supporting steel tank for storing liquid products, and the outer tank is a self-supporting steel or concrete storage tank with a vaulted roof. Liquid ammonia, liquid nitrogen and the like need to be stored by low temperature storage tank. The structure of low temperature storage tank can be seen from the following patent description:

[0003] The patent with the application number CN201520315740.4 discloses a super large concrete full containment type low temperature storage tank, which comprises the following structures: a low temperature steel inner tank, a concrete outer tank and a concrete high-piled pile cap, a tank top and an insulation layer, the low temperature steel inner tank comprises an inner tank bottom plate and an inner tank wall plate, the inner tank is provided with an inner tank wall reinforcing ring, and the inner tank wall plate comprises a plurality of annular cylinder segments which are continuously increased in low temperature steel plate thickness from top to bottom and are assembled together; the concrete outer tank comprises a prestressed concrete outer tank wall, an outer tank bottom lining plate and an outer tank wall lining plate, wherein the outer tank wall comprises a prestressed concrete cylinder segment, a reinforcing connection structure of the top tank wall and the tank top; the tank top comprises a concrete outer tank top, a compression ring, an arched net rack steel structure and a skin plate, a suspended ceiling plate and a tank top connecting pipe accessory, wherein the suspended ceiling plate is connected with the arched net rack steel structure through a pull rod, the compression ring comprises a top compression ring and a side wall compression ring, the side wall compression ring is fixed to the inner side of the top of the concrete outer tank cylinder, and the arched net rack steel structure is rigidly welded and connected with the side wall compression ring through a connecting plate; the insulation layer comprises a tank bottom insulation layer, an annular space insulation layer between the inner tank wall plate and the outer tank wall lining plate and a thermal edge angle protection layer, and an outer side insulation layer of the suspended ceiling plate; wherein the tank bottom insulation layer comprises a tank bottom edge cold insulation structure and a tank bottom center cold insulation structure; the annular space insulation layer between the inner tank wall plate and the outer tank wall lining plate comprises a filling insulation layer and an elastic insulation layer; the uppermost layer of glass wool felt of the outer side insulation layer of the suspended ceiling plate is covered with aluminum foil.

[0004] A patent with application number CN202122008593.4 discloses a high-stability new low-temperature LNG storage tank, which comprises an inner tank and an outer tank. The inner tank and the outer tank have a cavity for vertical filling of a cold-keeping layer therebetween. The outer wall of the outer tank has a pressure-bearing ring. The upper ends of the inner tank and the outer tank are jointly connected with a vault, which is fixedly connected with the pressure-bearing ring. The outer part of the outer tank has a prestressed concrete wall. The bottom part between the outer side of the inner tank and the inner side of the outer tank has, from top to bottom, an upper concrete leveling layer, a dry sand layer, a first foam glass, and a lower concrete leveling layer. The corners between the inner tank and the outer tank have a corner protection structure. The sides of the vault have cold-keeping layer filling structures above the cavity. The cold-keeping layer filling structures are in communication with the corresponding cavities, and the two cold-keeping layer filling structures are fixedly connected with an aluminum ceiling. The upper end surface of the aluminum ceiling has glass wool. The aluminum ceiling and the inner wall of the vault have a plurality of evenly distributed suspender rods. The cold-keeping layer filling structure comprises a cold-keeping layer retaining wall. The cold-keeping layer retaining wall and the inner wall of the vault and the inner wall of the outer tank form a filling chamber for vertical filling of the cold-keeping layer. The filling chamber is in communication with the corresponding cavity. The filling chamber has an inner tank crane beam at a position in the inner wall of the vault. The cold-keeping layer retaining wall is arranged close to the corresponding suspender rod. The cavity has an elastically felt arranged vertically at a position on the outer wall of the inner tank. The vault has a filling port above the filling chamber. The width of the filling chamber is greater than that of the cavity.

[0005] A patent with application number CN202211537688.8 discloses a new low-temperature liquid hydrogen storage tank, which comprises an outer tank and an inner tank. An annular heat-insulating space is formed between the outer tank and the inner tank. The annular heat-insulating space comprises a ring gap cold-keeping layer and a bottom cold-keeping layer. The ring gap cold-keeping layer is located on the top and the outer side of the sidewall of the inner tank, and the bottom cold-keeping layer is located on the bottom of the inner tank. A liquid nitrogen cold screen and a first heat-insulating material are arranged in the ring gap cold-keeping layer, and a liquid nitrogen cold screen and a second heat-insulating material are arranged in the bottom cold-keeping layer. The liquid nitrogen cold screen is composed of a cold screen pipe filled with liquid nitrogen and is laid on the outer wall of the inner tank. The liquid nitrogen cold screen maintains the low-temperature environment of the inner tank through liquid nitrogen circulation. The first heat-insulating material is filled in the ring gap cold-keeping layer, and the second heat-insulating material is filled in the bottom cold-keeping layer. A main shielding layer and a secondary shielding layer are laid along the inner wall of the inner tank. The secondary shielding layer is laid between the main shielding layer and the inner wall of the inner tank. The third heat-insulating material is filled between the main shielding layer and the secondary shielding layer. The fourth heat-insulating material is filled between the secondary shielding layer and the inner wall of the inner tank.

[0006] The applicant designs an inner tank structure with simple structure based on the existing structure. The inner tank structure comprises a concrete foundation, a steel tank body, a ring beam, a thermal insulation layer and a sand cushion layer, etc. The steel tank body comprises a tank bottom and a tank wall, etc. The ring beam is fixed on the concrete foundation and coaxially arranged with the steel tank body. The outer edge of the tank bottom extends outward to form a flange relative to the tank wall, and the edge is placed on the ring beam. The thermal insulation layer and the sand cushion layer are sequentially arranged from bottom to top, and are arranged between the concrete foundation and the tank bottom, and are filled in the annular space surrounded by the ring beam.

[0007] After the inner tank is processed, pressure test is needed, and the pressure test is usually water test. For a storage tank with a diameter of about 20m, the applicant performs pressure test on the foregoing inner tank structure. The test process is as follows: fill water to a liquid level of about 18m, perform foundation settlement, and after the settlement amount is stable, lower the liquid level to 14m, and perform positive pressure test by increasing pressure. The applicant finds that when the pressure is increased to 5kPa, the edge of the tank bottom is obviously curved upward, and the pressure test is unqualified. Content of the utility model

[0008] In order to solve the foregoing problem, the utility model embodiment provides an inner tank structure of a chemical storage tank, which is simple in structure, qualified in pressure test and has no curvature of the edge of the tank bottom. The technical scheme is as follows:

[0009] The utility model embodiment provides an inner tank structure of a chemical storage tank, which comprises a concrete foundation 1, a steel tank body, a ring beam 2, a thermal insulation layer 3 and a sand cushion layer, the steel tank body comprises a tank bottom 4 and a tank wall 5, the ring beam 2 is fixed on the concrete foundation 1 and coaxially arranged with the steel tank body, the outer edge of the tank bottom 4 extends outward to form a flange 6 relative to the tank wall 5, and the edge is placed on the ring beam 2, the thermal insulation layer 3 and the sand cushion layer are sequentially arranged from bottom to top, and are arranged between the concrete foundation 1 and the tank bottom 4, and are filled in the annular space surrounded by the ring beam 2, the thickness of the tank bottom 4 gradually thins from the edge to the center, and gradually inclines downward from the edge to the center, and the inclination angle is 1 / 100-1 / 140, the tank wall 5 gradually thickens from top to bottom, and a plurality of anchoring metal bands 7 are arranged between the lower part of the tank wall 5 and the concrete foundation 1, and the plurality of anchoring metal bands 7 are arranged around the steel tank body, the anchoring metal band 7 is vertically arranged, the lower end is embedded in the concrete foundation 1, the upper part is bent towards the steel tank body, and the upper end is fixed on the lower part of the tank wall 5.

[0010] Among them, the thermal insulation layer 3 in the utility model embodiment is built by two layers of foam glass bricks, and the thickness is 18-25cm, the sand cushion layer is made of dry sand, and the thickness is 22-28mm.

[0011] Preferably, the tank bottom 4 in the utility model embodiment gradually inclines downward from the edge to the center, and the inclination angle is 1 / 120.

[0012] Specifically, in this embodiment of the present invention, the edge of the can bottom 4 extends outward by 50-75mm relative to the can wall 5 to form a flange 6; the thickness of the edge of the can bottom 4 is 11-13mm, and the thickness at its center is 9-11mm; the thickness of the upper part of the can wall 5 is 11-13mm, and the thickness at its lower end is 15-18mm.

[0013] Specifically, in this embodiment of the present invention, the anchoring metal strip 7 is a stainless steel metal strip.

[0014] In this embodiment of the present invention, the anchoring metal strip 7 includes an embedded part 71, a lower straight metal strip 72, and an upper curved metal strip 72. The embedded part 71 is horizontally arranged and fixed to the lower end of the lower straight metal strip 72, and is embedded in the concrete foundation 1. The lower straight metal strip 72 is vertically arranged and located outside the steel tank, with its lower part embedded in the concrete foundation 1. The upper end of the upper curved metal strip 73 is fixed to the lower part of the tank wall 5, and it bends in an arc from bottom to top toward the tank wall 5. Its lower end is welded and fixed to the upper end of the lower straight metal strip 72.

[0015] The beneficial effects of the technical solution provided by this utility model embodiment are as follows: This utility model embodiment provides an inner tank structure for a chemical storage tank. During pressure testing, water is filled to a level of 18.3m, and foundation settlement is carried out. After the settlement stabilizes, the liquid level is lowered to 13.8m, and a positive pressure test is conducted at 8.75kPa. The tightness of the steel tank body and the warping of the tank bottom edge are checked. The test results show that the steel tank body has good tightness and no warping is observed at the tank bottom edge; the water-filled leak test is qualified. Attached Figure Description

[0016] Figure 1 This is a partial structural diagram of the inner tank structure of the chemical storage tank in this embodiment.

[0017] In the diagram: 1. Concrete foundation, 2. Ring beam, 3. Insulation layer, 4. Tank bottom, 5. Tank wall, 6. Flange, 7. Anchoring metal strip;

[0018] 71 Embedded parts, 72 Lower straight metal strip, 73 Upper curved metal strip. Detailed Implementation

[0019] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0020] Example 1

[0021] See Figure 1, the embodiment 1 provides an inner tank structure of a chemical storage tank, which comprises a concrete foundation 1, a steel tank body, a ring beam 2, a thermal insulation layer 3, a sand cushion layer and a plurality of anchoring metal bands 7. The steel tank body comprises a tank bottom 4 and a tank wall 5, the tank bottom 4 is circular, and the tank wall 5 is a cylindrical structure and is coaxially arranged with the tank bottom 4. The material of the steel tank body is 16MnDR. The ring beam 2 is fixed on the concrete foundation 1 and is coaxially arranged with the steel tank body, and the material thereof can be concrete. The edge of the tank bottom 4 extends outward by 50-75mm to form a flange 6 relative to the tank wall 5, and the edge is arranged on the ring beam 2. Specifically, the tank wall 5 is located directly above the ring beam 2 and is arranged close to the outer side of the ring beam 2. The outer edge of the flange 6 is flush with the outer side of the ring beam 2. The thermal insulation layer 3 and the sand cushion layer are sequentially arranged from bottom to top and are arranged between the concrete foundation 1 and the tank bottom 4 and are filled in the annular space surrounded by the ring beam 2. Specifically, the thermal insulation layer 3 is made of two layers of foam glass bricks (the specifications are all 500mm*450mm*100mm, the density is 148kg / m 3 , and the compressive strength is 0.86Mpa) and the thickness is 18-25cm, and the sand cushion layer is made of dry sand and the thickness is 22-28mm. The foregoing structure is similar to the structure of the existing inner tank structure, and the difference lies in that:

[0022] The thickness of the tank bottom 4 in the embodiment gradually thins from the edge to the center, is gradually inclined downward (i.e. a slight slope structure is formed) from the edge to the center, the inclination angle is 1 / 100-1 / 140, the thickness of the edge is 11-13mm, and the thickness of the center is 9-11mm. The tank wall 5 gradually thickens from top to bottom, a plurality of anchoring metal bands 7 are arranged between the lower outer side of the tank wall 5 and the concrete foundation 1, the thickness of the upper part is 11-13mm, and the thickness of the lower end is 15-18mm. The plurality of (the number is greater than or equal to four) anchoring metal bands 7 are arranged around the steel tank body (uniformly distributed or unevenly distributed). The anchoring metal band 7 is vertically arranged, the lower end is embedded in the concrete foundation 1, the upper part is bent towards the steel tank body, the upper end is fixed on the lower part of the tank wall 5, and the anchoring metal band 7 is a stainless steel band (the material is 1Cr18Ni9Ti) and is located in the outer tank.

[0023] Embodiment 2

[0024] Referring to Figure 1The inner tank structure of the chemical storage tank of the embodiment 2 is basically the same as that of the embodiment 1, and the difference is that the anchoring metal belt 7 in the embodiment 2 comprises a pre-embedded part 71, a lower straight metal belt 72 and an upper bent metal belt 73. The pre-embedded part 71 is horizontally arranged and fixed at the lower end of the lower straight metal belt 72 and is pre-embedded in the concrete foundation 1 and is in the form of a rectangular block. The lower straight metal belt 72 is vertically arranged and located outside the steel tank body and is pre-embedded in the concrete foundation 1 and is parallel to the corresponding part of the tank wall 5. The upper end of the upper bent metal belt 73 is fixed at the lower part of the tank wall 5, and the upper bent metal belt 73 is arc-shaped bent from bottom to top towards the tank wall 5, and the lower end of the upper bent metal belt 73 is welded and fixed with the upper end of the lower straight metal belt 72. The foregoing structure is easy to install the anchoring metal belt 7, and the lower straight metal belt 72 and the upper bent metal belt 73 are welded during assembly.

[0025] Embodiment 3

[0026] The inner tank structure of the chemical storage tank of the embodiment 3 is basically the same as that of the embodiment 1, and the difference is that the diameter of the steel tank body in the embodiment 3 is 21.42 m, the volume is 8000 m 3 ; the tank bottom 4 is gradually inclined from the edge to the center and the inclination angle is 1 / 120. The edge of the tank bottom 4 extends outward by 60 mm relative to the tank wall 5 to form a flange 6, the thickness of the heat preservation layer 3 is 20 cm, and the thickness of the sand cushion layer is 25 mm. The thickness of the edge of the tank bottom 4 is 12 mm, and the thickness at the center is 10 mm. The thickness of the upper part of the tank wall 5 is 12 mm, and the thickness of the lower end is 16 mm. The design requirements are shown in Table 1:

[0027] Table 1

[0028]

[0029] The test process is as follows: fill water to the liquid level of 18.3 m, carry out foundation settlement, after the settlement amount is stable, lower the liquid level to 13.8 m, carry out positive pressure test by increasing pressure to 8.75 kPa. Check the tightness of the steel tank body and the warping condition of the edge of the tank bottom. After detection, the steel tank body is good in tightness and the edge of the tank bottom has no warping condition, and the water filling test is qualified.

[0030] Embodiment 4

[0031] The inner tank structure of the chemical storage tank of the embodiment 4 is basically the same as that of the embodiment 1, and the difference is that the upper and lower sides of the heat preservation layer 3 in the embodiment 4 can be respectively provided with a leveling layer and a waterproof layer, the waterproof layer is formed by impregnating asphalt in oil felt paper, and the leveling layer is formed by brushing two coats of asphalt paint, and the surface is flat and free of bubbles.

[0032] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. The inner tank structure of chemical storage tank, comprising concrete foundation (1), steel tank body, ring beam (2), insulation layer (3) and sand cushion layer, the steel tank body comprises tank bottom (4) and tank wall (5), the ring beam (2) is fixed on the concrete foundation (1) and it is coaxial with the steel tank body, the outer edge of the tank bottom (4) extends outward to form flange (6) relative to the tank wall (5), and the edge is placed on the ring beam (2), the insulation layer (3) and sand cushion layer are sequentially arranged from bottom to top, which is arranged between the concrete foundation (1) and the tank bottom (4), and is filled in the annular space surrounded by the ring beam (2), characterized in that; The thickness of the tank bottom (4) gradually thins from the edge to the center, which gradually slopes downward from the edge to the center with an inclination angle of 1 / 100-1 / 140; the tank wall (5) gradually thickens from top to bottom, and a plurality of anchoring metal strips (7) are arranged between the lower outer side of the tank wall (5) and the concrete foundation (1), and the plurality of anchoring metal strips (7) are arranged around the steel tank body; the anchoring metal strips (7) are vertically arranged, the lower end is embedded in the concrete foundation (1), the upper part is bent towards the steel tank body, and the upper end is fixed on the lower part of the tank wall (5). ​ 2. The inner tank structure of a chemical storage tank according to claim 1, wherein The heat preservation layer (3) is made of two layers of foam glass bricks and has a thickness of 18-25 cm, and the sand cushion layer is made of dry sand and has a thickness of 22-28 mm.

3. The inner tank structure of a chemical storage tank according to claim 1, wherein The tank bottom (4) gradually slopes downward from the edge to the center with an inclination angle of 1 / 120.

4. The inner tank structure of a chemical storage tank according to claim 1, wherein The edge of the tank bottom (4) extends outward by 50-75 mm relative to the tank wall (5) to form a flange (6); the thickness of the edge of the tank bottom (4) is 11-13 mm, and the thickness at the center is 9-11 mm; the thickness of the upper part of the tank wall (5) is 11-13 mm, and the thickness of the lower end is 15-18 mm.

5. The inner tank structure of a chemical storage tank according to claim 1, wherein The anchoring metal strip (7) is a stainless steel metal strip.

6. The inner tank structure of a chemical storage tank according to claim 1, wherein The anchoring metal strip (7) includes a pre-embedded part (71), a lower straight metal strip (72), and an upper bent metal strip (73); the pre-embedded part (71) is horizontally arranged and fixed at the lower end of the lower straight metal strip (72), which is embedded in the concrete foundation (1); the lower straight metal strip (72) is vertically arranged outside the steel tank body, and the lower part is embedded in the concrete foundation (1); the upper end of the upper bent metal strip (73) is fixed on the lower part of the tank wall (5), which is arc-shaped bent towards the tank wall (5) from bottom to top, and the lower end is welded and fixed with the upper end of the lower straight metal strip (72).

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