Steel oil tank lining structure and lining modification technology

Abstract

This invention provides a steel oil tank lining structure and lining modification process, relating to the field of oil tank technology. The lining structure includes an inner tank wall, a first reinforcing wall, and a second reinforcing wall. The first reinforcing wall is located on the outer side of the inner tank wall, and the second reinforcing wall is located on the outer side of the first reinforcing wall. A filling space is provided between the first and second reinforcing walls, and a filling layer is provided within the filling space. The filling layer includes a resin-cured layer and a braided layer. The resin-cured layer has two layers, and the braided layer is located between the two resin-cured layers. The filling layer is composed of the braided layer and the resin-cured layer. The braided layer is formed by interlacing ceramic fibers wound around the outer side of carbon fibers. Due to the characteristics of ceramic fibers and carbon fibers and their interlaced structure, the overall strength of the filling layer is higher, and it is not easy to crack or break. Elastic rubber balls are filled inside the gaps of the braided layer, giving the filling layer elastic potential energy and a certain degree of seismic resistance.

Description

Technical Field

[0001] This invention relates to the field of oil tank technology, and more particularly to the lining structure and modification process of steel oil tanks. Background Technology

[0002] An oil tank is a container for storing oil products and is a key facility in an oil depot. Oil tanks can be broadly classified into two categories based on their material: non-metallic oil tanks and metallic oil tanks. Metallic oil tanks are the most commonly used, while non-metallic oil tanks are generally only used in field oil depots and include oil-resistant rubber flexible tanks, fiberglass tanks, and plastic tanks. The inherent disadvantages of oil tanks are as follows: the tank walls are susceptible to corrosion, leading to perforation. In the event of a rupture, the fire dike will inevitably be destroyed, causing a complete oil spill. If the uncontrolled spilled oil encounters a source of ignition, it will create a large-scale fire.

[0003] Given the severe impact of corrosion damage to oil storage tank walls and the structural limitations of single-layer metal tanks, research on double-walled tank structures began in the early 1990s. In vertical oil storage tanks, a double-walled structure is used, adding an outer tank wall outside the inner lining. An annular space is formed between the two walls and filled with supporting components. This reduces the corrosion rate of the tank walls, prevents the spread of contaminants in case of oil leaks, and allows for reliable leak detection. However, previous double-walled tank composite structures typically used materials such as lining cloth, 3D fabric / 3D aluminum foil, etc. These materials are prone to cracking due to low strength, and their poor interlayer bonding can lead to misalignment, affecting uniform support performance. Furthermore, their seismic resistance is limited, thus offering limited protection for the tank. Therefore, this invention proposes a steel oil tank lining structure and lining modification process to address the problems existing in the prior art. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a steel oil tank lining structure and lining modification process. Due to the characteristics of ceramic fibers and carbon fibers, as well as their interwoven structure, the steel oil tank lining structure has higher overall strength and is less prone to cracking and breakage.

[0005] To achieve the objectives of this invention, the invention is implemented through the following technical solutions:

[0006] The first aspect of the present invention provides a steel oil tank lining structure, including an inner tank wall, a first reinforcing wall and a second reinforcing wall. The first reinforcing wall is disposed on the outside of the inner tank wall, and the second reinforcing wall is disposed on the outside of the first reinforcing wall. A filling space is provided between the first reinforcing wall and the second reinforcing wall, and a filling layer is provided in the filling space. The filling layer includes a resin curing layer and a braided layer. The resin curing layer has two layers, and the braided layer is disposed between the two resin curing layers.

[0007] The braided layer is composed of carbon fiber and ceramic fiber. The ceramic fiber is wound around the outside of the carbon fiber to form braided fiber, and multiple sets of braided fibers are interwoven to form the braided layer. The gaps in the braided layer are filled with elastic rubber balls.

[0008] A further improvement is that the braided layer has at least three layers, and the three braided layers and the resin curing layers on both sides are sewn together by a suture. The suture is impregnated with resin and cured into a resin column in the filling layer. The resin column is X-shaped.

[0009] A further improvement is that the diameter of the carbon fiber is 4-45 μm, and the diameter of the ceramic fiber is 4-35 μm.

[0010] A further improvement is that both the first reinforcing wall and the second reinforcing wall are made of fiberglass steel, and the first reinforcing wall, the filling layer, and the second reinforcing wall are bonded together with adhesive.

[0011] A further improvement is that the outer side of the inner tank wall is covered with a repair material, and the outer side of the repair material is coated with a glaze layer, and the first reinforcing wall is bonded to the outer side of the glaze layer by adhesive.

[0012] Further improvements are made in that: the repair material is composed of a mixture of barium aluminate cement, kaolin powder and clay brick fragments, and the glaze layer is composed of a mixture of charred gemstone powder, alumina, chromium trioxide, zirconium oxide micro powder and aluminum phosphate solution.

[0013] The second aspect of this invention provides a process for modifying the lining of a steel oil tank, comprising the following steps:

[0014] Step 1: Manually check the oil and gas concentration on the outer side of the inner wall of the oil tank and ventilate until the oil and gas concentration drops to a safe level;

[0015] Step 2: Prepare the repair material and glaze layer. Apply a layer of adhesive to the outside of the inner tank wall, then spray the repair material evenly onto the outside of the inner tank wall and dry it.

[0016] Step 3: After the repair material has dried and solidified, spray a glaze layer on the outside of the repair material and dry it. Then, bond the first reinforcing wall to the outside of the glaze layer with adhesive.

[0017] Step 4: Make the filling layer. Wrap ceramic fibers around the outside of carbon fibers to form braided fibers. Weave multiple sets of braided fibers together to form a braided layer. Fill the gaps in the braided layer with elastic rubber balls.

[0018] Step 5: Stack the three braided layers together, spray resin curing layers on the top and bottom respectively. When the resin curing layer has cured into a resin board, use resin-impregnated stitching thread to sew the braided layer and the resin board together in an X shape, and wait for the stitching thread to cure into a resin column.

[0019] Step 6: Attach the filler layer to the outside of the first reinforcing wall using adhesive, and then attach the second reinforcing wall to the outside of the filler layer using adhesive.

[0020] A further improvement is made in the following step: In step two, the specific method for preparing the repair material is as follows: Crush clay brick fragments into granules, and weigh the raw materials according to the following mass ratio: 15-25 parts of kaolin powder, 50-70 parts of clay brick fragments, 5-12 parts of barium aluminate cement, and 5-8 parts of water. Put the above raw materials into a mixer and stir for 10-20 minutes to obtain the repair material.

[0021] A further improvement is made in the following steps: In step two, the specific method for preparing the glaze layer is as follows: Weigh the following raw materials according to the mass ratio: 20-40 parts of fine slag powder, 5-15 parts of alumina, 10-25 parts of chromium trioxide, 10-20 parts of zirconium oxide micro powder, and 20-25 parts of aluminum phosphate solution; mix the above raw materials evenly to prepare a slurry for glazing.

[0022] Further improvements are made by using a mixture of styrene-acrylic emulsion, formaldehyde-free modified adhesive, polydimethylsiloxane, ammonium polyphosphate, and heat stabilizer.

[0023] The beneficial effects of this invention are as follows:

[0024] 1. The present invention adds a first reinforcing wall and a second reinforcing wall to the outer side of the inner tank wall, and fills the space between the two reinforcing walls with a filling layer. The filling layer consists of a braided layer and a resin curing layer. The braided layer is composed of ceramic fibers wrapped around the outer side of carbon fibers in an interwoven manner. Due to the characteristics of ceramic fibers and carbon fibers and their interwoven structure, the overall strength of the filling layer is higher and it is not easy to crack or break.

[0025] 2. In this invention, the filling layer is stitched in an X-shape using resin-impregnated sutures. The sutures are cured into resin columns to provide support inside the filling layer, making the overall pressure-bearing capacity of the filling layer stronger. The sutures connect the braided layer and the resin-cured layer, resulting in strong interlayer bonding, preventing misalignment and ensuring uniform support.

[0026] 3. The present invention fills the gaps in the woven layer with elastic rubber balls, so that the filling layer has elastic potential energy, has a certain shock resistance, and has diversified functions.

[0027] 4. In the process of modifying the inner lining of an oil tank, this invention prepares a repair material and a glaze layer. The repair material is applied to the outside of the inner tank wall and then the glaze layer is sprayed on. This helps to repair defects in the inner tank wall and solidify the inner tank wall, making the oil tank more robust. Attached Figure Description

[0028] Figure 1 This is a cross-sectional view of the present invention;

[0029] Figure 2This is a schematic diagram showing the splitting of the filling layer of the present invention;

[0030] Figure 3 This is a schematic diagram of the suture line of the present invention;

[0031] Figure 4 This is a schematic diagram of the braided layer assembly of the present invention.

[0032] The components are: 1. Inner tank wall; 2. First reinforcing wall; 3. Second reinforcing wall; 4. Filling layer; 5. Resin curing layer; 6. Braided layer; 7. Carbon fiber; 8. Ceramic fiber; 9. Elastic rubber ball; 10. Stitching thread; 11. Repair material; 12. Glaze layer. Detailed Implementation

[0033] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0034] Example 1

[0035] according to Figure 1 , 2 As shown in Figures 3 and 4, this embodiment proposes a steel oil tank lining structure, including an inner tank wall 1, a first reinforcing wall 2, and a second reinforcing wall 3. The first reinforcing wall 2 is located on the outside of the inner tank wall 1, and the second reinforcing wall 3 is located on the outside of the first reinforcing wall 2. A filling space is provided between the first reinforcing wall 2 and the second reinforcing wall 3, and a filling layer 4 is provided in the filling space. The filling layer 4 includes a resin curing layer 5 and a braided layer 6. The resin curing layer 5 has two layers, and the braided layer 6 is located between the two resin curing layers 5.

[0036] The braided layer 6 is composed of carbon fiber 7 and ceramic fiber 8. The ceramic fiber 8 is wound around the outside of the carbon fiber 7 to form braided fibers, and multiple sets of braided fibers are interwoven to form the braided layer 6. The gaps in the braided layer 6 are filled with elastic rubber balls 9. The space between the two reinforcing walls is filled with a filler layer 4, which is composed of the braided layer 6 and a resin curing layer 5. The braided layer 6 is composed of interwoven ceramic fiber 8 wound around the outside of the carbon fiber 7. Due to the properties of the ceramic fiber 8 and the carbon fiber 7 and their interwoven structure, the filler layer 4 has higher overall strength and is less prone to cracking or breaking.

[0037] The braided layer 6 has three layers, which are sewn together with the resin-cured layers 5 on both sides by sutures 10. The sutures 10 are impregnated with resin and cured into resin columns within the filler layer 4, and the resin columns are X-shaped. The filler layer 4 is also sewn together with resin-impregnated sutures 10 along the X-shape. The sutures 10 are cured into resin columns, providing support within the filler layer 4, thus enhancing the overall pressure-bearing capacity of the filler layer 4. The sutures 10 connect the braided layer 6 and the resin-cured layer 5, resulting in strong interlayer bonding, preventing misalignment, and ensuring uniform support.

[0038] The carbon fiber 7 has a diameter of 35 μm, and the ceramic fiber 8 has a diameter of 25 μm.

[0039] The first reinforcing wall 2 and the second reinforcing wall 3 are both made of fiberglass steel, and the first reinforcing wall 2, the filling layer 4, and the second reinforcing wall 3 are bonded together with adhesive.

[0040] The outer side of the inner tank wall 1 is covered with repair material 11, and the outer side of the repair material 11 is coated with a glaze layer 12. The first reinforcing wall 2 is bonded to the outer side of the glaze layer 12 with adhesive. The repair material 11 is composed of a mixture of barium aluminate cement, kaolin powder, and clay brick fragments. The glaze layer 12 is composed of a mixture of calcined alumina powder, alumina, chromium trioxide, zirconium oxide micropowder, and aluminum phosphate solution. Barium aluminate cement and kaolin powder can increase the strength of the repair material; clay brick fragments, as a base material, can be recycled from engineering waste, saving costs; the glaze layer 12, composed of calcined alumina powder, alumina, chromium trioxide, zirconium oxide micropowder, and aluminum phosphate solution, facilitates rapid curing and enhances the surface strength and compactness of the repair material 11.

[0041] Example 2

[0042] according to Figure 1 , 2 As shown in Figures 3 and 4, this embodiment proposes a process for modifying the lining of steel oil tanks, including the following steps:

[0043] Step 1: Manually check the oil and gas concentration on the outside of the inner wall 1 of the oil tank and ventilate until the oil and gas concentration drops to a safe level.

[0044] Step 2: Prepare repair material 11, specifically: crush clay brick fragments into granules, and weigh the raw materials according to the following mass ratio: 20 parts kaolin powder, 60 parts clay brick fragment granules, 10 parts barium aluminate cement, and 7 parts water. Put the above raw materials into a mixer and stir for 15 minutes to obtain repair material 11. Prepare glaze layer 12, specifically: weigh the following raw materials according to the following mass ratio: 30 parts fine powder of calcined gemstone, 10 parts alumina, 20 parts chromium trioxide, 15 parts zirconium oxide micro powder, and 20 parts aluminum phosphate solution. Mix the above raw materials evenly to make a slurry for glazing. Coat a layer of adhesive on the outside of the inner tank wall 1, and then evenly spray the repair material 11 onto the outside of the inner tank wall 1 and dry it. In the process of modifying the inner lining of the oil tank, this invention prepares repair material 11 and glaze layer 12. Coating the outside of the inner tank wall 1 with repair material 11 and then spraying the glaze layer 12 is beneficial for repairing defects in the inner tank wall 1 and for curing the inner tank wall 1, making the oil tank more robust.

[0045] Step 3: After the repair material 11 has dried and solidified, spray the glaze layer 12 onto the outside of the repair material 11 and dry it. Then, bond the first reinforcing wall 2 to the outside of the glaze layer 12 with adhesive.

[0046] Step 4: Fabricate the filling layer 4. Wrap ceramic fibers 8 around the outside of carbon fiber 7 to form woven fibers. Interweave multiple sets of woven fibers to form a woven layer 6. Fill the gaps in the woven layer 6 with elastic rubber balls 9. The woven layer 6 is composed of interweaving ceramic fibers 8 wrapped around the outside of carbon fiber 7. Due to the characteristics of ceramic fibers 8 and carbon fiber 7 and their interweaving structure, the filling layer 4 has higher overall strength and is less prone to cracking or breaking. Filling the gaps in the woven layer 6 with elastic rubber balls 9 gives the filling layer 4 elastic potential energy and a certain degree of seismic resistance.

[0047] Step 5: Stack the three braided layers 6 together, and spray the top and bottom surfaces with resin curing layers 5 respectively. When the resin curing layer 5 has cured into a resin board, use resin-impregnated stitching thread 10 to sew the braided layer 6 and the resin board along an X shape, and wait for the stitching thread 10 to cure into a resin column. The inside of the filling layer 4 is sewn with resin-impregnated stitching thread 10 along an X shape. The stitching thread 10 cures into a resin column and provides support inside the filling layer 4, making the overall pressure-bearing capacity of the filling layer 4 stronger. The stitching thread 10 connects the braided layer 6 and the resin curing layer 5, making the interlayer bonding strong and not easy to misalign, ensuring uniform support.

[0048] Step 6: Adhere the filler layer 4 to the outside of the first reinforcing wall 2 with adhesive, and then adhere the second reinforcing wall 3 to the outside of the filler layer 4 with adhesive.

[0049] The adhesive is made from a mixture of styrene-acrylic emulsion, formaldehyde-free modified adhesive, polydimethylsiloxane, ammonium polyphosphate, and heat stabilizer. Adhesives made from these materials are corrosion-resistant and do not easily fail.

[0050] This invention adds a first reinforcing wall 2 and a second reinforcing wall 3 to the outer side of the inner tank wall, and fills the space between the two reinforcing walls with a filling layer 4. The filling layer 4 consists of a braided layer 6 and a resin-cured layer 5. The braided layer 6 is composed of ceramic fibers 8 interwoven around the outer side of carbon fibers 7. Due to the characteristics of ceramic fibers 8 and carbon fibers 7 and their interwoven structure, the filling layer 4 has higher overall strength and is less prone to cracking or breaking. Furthermore, the filling layer 4 is stitched in an X-shape with resin-impregnated stitching 10. The stitching 10 cures into resin columns, providing support within the filling layer 4, thus enhancing its overall pressure-bearing capacity. The stitching 10 connects the braided layer 6 and the resin-cured layer 5, resulting in strong interlayer bonding, preventing misalignment, and ensuring uniform support. Simultaneously, this invention fills the gaps in the braided layer 6 with elastic rubber balls 9, giving the filling layer 4 elastic potential energy and a certain degree of shock resistance, thus diversifying its functions. In addition, when modifying the inner lining of the oil tank, the present invention prepares a repair material 11 and a glaze layer 12. The repair material 11 is applied to the outside of the inner tank wall 1 and then the glaze layer 12 is sprayed on, which is beneficial to repair the defects of the inner tank wall 1 and solidify the inner tank wall 1, making the oil tank more robust.

[0051] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A steel oil tank lining structure, comprising an inner tank wall (1), a first reinforcing wall (2), and a second reinforcing wall (3), characterized in that: The first reinforcing wall (2) is located on the outside of the inner tank wall (1), and the second reinforcing wall (3) is located on the outside of the first reinforcing wall (2). A filling space is provided between the first reinforcing wall (2) and the second reinforcing wall (3), and a filling layer (4) is provided in the filling space. The filling layer (4) includes a resin curing layer (5) and a braided layer (6). The resin curing layer (5) has two layers, and the braided layer (6) is located between the two resin curing layers (5). The braided layer (6) is composed of carbon fiber (7) and ceramic fiber (8). The ceramic fiber (8) is wrapped around the outside of the carbon fiber (7) to form braided fiber, and multiple sets of braided fibers are interwoven to form the braided layer (6). The gaps in the braided layer (6) are filled with elastic rubber balls (9). The braided layer (6) has at least three layers. The three braided layers (6) and the resin curing layers (5) on both sides are sewn together by sutures (10). The sutures (10) are impregnated with resin and cured into resin columns in the filling layer (4). The resin columns are X-shaped. The sutures (10) connect the braided layer (6) and the resin curing layer (5), so that the interlayer bonding force is strong and it is not easy to misalign. The process of modifying the lining of steel oil tanks includes the following steps: Step 1: Manually check the oil and gas concentration on the outside of the inner wall (1) of the oil tank and ventilate until the oil and gas concentration drops to a safe level; Step 2: Prepare repair material (11) and glaze layer (12). Apply a layer of adhesive to the outside of the inner tank wall (1), then spray the repair material (11) evenly onto the outside of the inner tank wall (1) and dry it. Step 3: After the repair material (11) has dried and solidified, spray a glaze layer (12) on the outside of the repair material (11) and dry it. Then, attach the first reinforcing wall (2) to the outside of the glaze layer (12) with adhesive. Step 4: Make a filling layer (4), wrap ceramic fibers (8) around the outside of carbon fiber (7) to form a braided fiber, weave multiple sets of braided fibers together to form a braided layer (6), and fill the gaps in the braided layer (6) with elastic rubber balls (9). Step 5: Stack the three braided layers (6) together, spray the resin curing layer (5) on the top and bottom respectively, and when the resin curing layer (5) is cured into a resin board, use the resin-impregnated suture (10) to sew the braided layer (6) and the resin board along the X shape, and wait for the suture (10) to cure into a resin column. Step 6: Adhere the filler layer (4) to the outside of the first reinforcing wall (2) with adhesive, and then adhere the second reinforcing wall (3) to the outside of the filler layer (4) with adhesive.

2. The steel oil tank lining structure according to claim 1, characterized in that: The carbon fiber (7) has a diameter of 4-45 μm, and the ceramic fiber (8) has a diameter of 4-35 μm.

3. The steel oil tank lining structure according to claim 1, characterized in that: The first reinforcing wall (2) and the second reinforcing wall (3) are both made of fiberglass steel, and the first reinforcing wall (2), the filling layer (4) and the second reinforcing wall (3) are bonded together with adhesive.

4. The steel oil tank lining structure according to claim 1, characterized in that: The repair material (11) is composed of barium aluminate cement, kaolin powder and clay brick fragments, and the glaze layer (12) is composed of slag powder, alumina, chromium trioxide, zirconium oxide micro powder and aluminum phosphate solution.

5. The steel oil tank lining structure according to claim 1, characterized in that: In step two, the specific method for preparing the repair material (11) is as follows: crush clay brick fragments into granules, weigh the raw materials according to the following mass ratio: 15-25 parts of kaolin powder, 50-70 parts of clay brick fragments, 5-12 parts of barium aluminate cement, and 5-8 parts of water. Put the above raw materials into a mixer and stir for 10-20 minutes to obtain the repair material (11).

6. The steel oil tank lining structure according to claim 5, characterized in that: In step two, the specific method for preparing the glaze layer (12) is as follows: weigh the following raw materials according to the mass ratio: 20-40 parts of fine slag powder, 5-15 parts of alumina, 10-25 parts of chromium trioxide, 10-20 parts of zirconium oxide micro powder, and 20-25 parts of aluminum phosphate solution; mix the above raw materials evenly to make a slurry for glazing.

7. The steel oil tank lining structure according to claim 6, characterized in that: The adhesive is made from a mixture of styrene-acrylic emulsion, formaldehyde-free modified adhesive, polydimethylsiloxane, ammonium polyphosphate, and heat stabilizer.

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