Liquid ammonia full-capacity tank using non-metal retaining layer

Abstract

The utility model discloses a liquid ammonia full-capacity tank using a non-metal retaining layer, which relates to the technical field of liquid ammonia storage and transportation and comprises an inner tank and an outer tank, a retaining layer heat insulation structure connected into a whole is arranged between the inner tank and the outer tank, and an annular sealing heat insulation gap is formed between the outer side tank wall of the inner tank and the retaining layer heat insulation structure. A cold insulation layer is arranged between the inner tank bottom of the inner tank and the retaining layer heat insulation structure; the retaining layer heat insulation structure is arranged between the inner tank and the outer tank, and the annular sealing heat insulation gap is formed between the outer side tank wall of the inner tank and the retaining layer heat insulation structure, so that leaked liquid ammonia can be stored in the retaining layer and is not in direct contact with the external environment, heat exchange is greatly reduced, and the service life of the liquid ammonia is prolonged. Therefore, large-area frosting and dew formation on the surface of the outer tank after leakage of the inner tank in an accident working condition are avoided, and gas emission generated by liquid ammonia leakage of the inner tank is remarkably reduced.

Description

Technical Field

[0001] This utility model relates to the field of liquid ammonia storage and transportation technology, specifically to a liquid ammonia full-containment tank using a non-metallic barrier layer. Background Technology

[0002] Liquid ammonia, as an important chemical raw material, has broad application prospects in many fields. With the increasing global focus on clean energy and environmental protection technologies, the development prospects of liquid ammonia are attracting much attention.

[0003] In agriculture, liquid ammonia is a key raw material for nitrogen fertilizer, and its demand is closely linked to agricultural production activities. With global population growth and increasing food demand, the application of liquid ammonia in agriculture is expected to continue to grow.

[0004] In the industrial sector, the application of liquid ammonia in industries such as chemicals and refrigeration is also increasing. For example, in the chemical industry, liquid ammonia is a key raw material for the production of chemicals such as amino acids and nylon; in the refrigeration industry, liquid ammonia is widely used in cooling systems.

[0005] In the field of new energy, liquid ammonia, as a carrier of hydrogen energy, has broad application prospects in the hydrogen energy industry chain. With the continuous development of hydrogen energy technology, the demand for liquid ammonia is expected to increase further.

[0006] As a crucial piece of equipment for storing liquid ammonia, full-containment liquid ammonia tanks are widely used. Currently, most full-containment liquid ammonia tanks built in the industry utilize an outer tank shell as a trapping layer, with loose expanded perlite used as insulation material in the space between the inner and outer tank walls. This type of tank mainly suffers from the following problems:

[0007] Firstly, loose expanded perlite comes into contact with toxic ammonia gas during use. Furthermore, because perlite has an open-cell structure, it will absorb a large amount of ammonia gas. During tank maintenance, this expanded perlite that has absorbed toxic ammonia gas is extremely difficult to dispose of properly as a toxic solid waste.

[0008] Secondly, after a leak occurs in the inner tank during an accident, the flowing liquid ammonia will fill the inner tank. At this time, the loose expanded perlite cannot provide effective insulation for the tank wall, and the outer tank surface will be covered with frost and condensation. The tank foundation is very easy to be damaged by low temperature freezing, and the liquid ammonia will vaporize in large quantities, significantly increasing the gas emissions from the tank and bringing great safety hazards. Utility Model Content

[0009] The purpose of this utility model is to provide a liquid ammonia full-containment tank using a non-metallic trapping layer. By setting a trapping layer insulation structure between the inner tank and the outer tank, and forming an annular sealed insulation gap between the outer tank wall of the inner tank and the trapping layer insulation structure, it can be ensured that the leaked liquid ammonia is stored in the trapping layer and does not come into direct contact with the external environment, which greatly reduces heat exchange. This avoids large-area frost and condensation on the surface of the outer tank after the inner tank leaks in an accident, and significantly reduces the gas emission generated by the leaked liquid ammonia from the inner tank.

[0010] This utility model is achieved through the following technical solution:

[0011] A liquid ammonia full-containment tank using a non-metallic storage layer includes an inner tank and an outer tank. A storage layer insulation structure that is integrally connected between the inner tank and the outer tank is provided. An annular sealed insulation gap is formed between the outer wall of the inner tank and the storage layer insulation structure. A cold insulation layer is provided between the bottom of the inner tank and the storage layer insulation structure.

[0012] In this design, the liquid ammonia full-containment tank mainly consists of an inner tank, an outer tank, and a heat-absorbing layer insulation structure located between them. An annular sealed insulation gap is formed between the outer wall of the inner tank and the heat-absorbing layer insulation structure. Under normal operating conditions, this gap effectively prevents heat from entering the inner tank from the outside, reducing the vaporization of liquid ammonia due to heat absorption, ensuring the stability of the stored liquid ammonia, and reducing energy loss. In the event of an accident involving a leak in the inner tank, this gap, in conjunction with the heat-absorbing layer insulation structure, prevents the leaked liquid ammonia from directly contacting the external environment, significantly reducing heat exchange and preventing large-scale frost or condensation on the outer tank surface due to contact with low-temperature liquid ammonia. It also reduces the amount of liquid ammonia vaporization, lowers gas emissions, and ensures the safe operation of the storage tank. Furthermore, a cold insulation layer is installed between the bottom of the inner tank and the heat-absorbing layer insulation structure, further enhancing the insulation performance of the full-containment tank. This cold insulation layer effectively blocks heat from entering the inner tank from the bottom, maintaining the low-temperature environment at the bottom of the inner tank and ensuring the stability of the stored liquid ammonia. The presence of the insulation layer also prevents stress concentration and deformation at the bottom of the inner tank caused by temperature changes, which helps to extend the service life of the inner tank and improve the reliability of the full-capacity tank.

[0013] As an optimized solution for liquid ammonia full-containment tanks, the heat-insulating structure of the storage layer includes heat-insulating components and a CAC anti-seepage layer;

[0014] The heat insulation component is connected to the inner wall of the outer tank, and the CAC anti-seepage layer is connected to the inner wall surface of the heat insulation component.

[0015] In this solution, the insulation components effectively prevent heat transfer, maintain a low-temperature environment inside the tank, and reduce the vaporization of liquid ammonia, while the CAC anti-seepage layer prevents leakage of liquid ammonia and ammonia gas, ensuring storage safety. The two work together to not only optimize the insulation and anti-seepage performance of the full-containment tank, but also make the full-containment tank more reliable and stable in the face of different operating conditions.

[0016] As an optimized solution for liquid ammonia full-containment tanks, the heat-insulating structure of the storage layer also includes fiberglass cloth, which is connected to the outer wall surface of the heat-insulating component.

[0017] In this solution, the fiberglass cloth is connected to the outer wall of the insulation component, which can enhance the overall structural strength of the trapping layer, making it more stable and less prone to damage when subjected to liquid ammonia pressure, temperature changes and external vibrations. At the same time, the fiberglass cloth can also assist in sealing, reducing the risk of gas and liquid leakage.

[0018] As an optimized solution for liquid ammonia full-containment tanks, the fiberglass cloth is connected to the inner tank wall of the outer tank by means of pasting or bolting.

[0019] In this solution, the adhesive bonding method is simple to apply and provides good sealing, allowing the fiberglass cloth to adhere tightly to the tank wall and enhancing the overall sealing performance; while the bolt fastening method provides a firm connection, ensuring that the fiberglass cloth can always function stably when dealing with complex working conditions such as vibration and pressure changes.

[0020] As an optimized solution for liquid ammonia full-containment tanks, the fiberglass cloth, the heat insulation components, and the CAC anti-seepage layer are bonded together into a block structure using low-temperature adhesive and laid on the inner wall of the outer tank.

[0021] In this solution, the fiberglass cloth, insulation components, and CAC impermeable layer are bonded together into a block structure using low-temperature adhesive. This not only enhances the integrity and stability of the components but also ensures that the structure will not loosen or separate due to temperature changes in the low-temperature liquid ammonia storage environment.

[0022] As an optimized solution for liquid ammonia full-containment tanks, the insulation component is made of polyurethane foam.

[0023] In this design, polyurethane foam possesses excellent thermal insulation properties and a low thermal conductivity, effectively preventing heat transfer, reducing the influx of external heat into the inner tank, decreasing the vaporization of liquid ammonia, and maintaining the low-temperature storage state of liquid ammonia, thus meeting the high thermal insulation requirements of the full-containment tank. It also possesses a certain degree of flexibility and compressive strength, which, during the operation of the full-containment tank, can buffer the impact of pressure changes in the inner tank and external vibrations on the tank structure, helping to maintain the overall structural stability of the full-containment tank.

[0024] As an optimized solution for liquid ammonia full-containment tanks, the cold insulation layer is a heat insulation structure made of foamed glass bricks.

[0025] In this solution, foamed glass bricks possess excellent thermal insulation properties. Their closed-cell structure results in low thermal conductivity, effectively preventing heat from entering the inner tank from the bottom. This creates a stable low-temperature environment at the bottom of the inner tank, reducing vaporization losses of liquid ammonia. The high compressive strength of the foamed glass bricks allows them to withstand part of the weight of the inner tank and liquid ammonia, enhancing the stability of the bottom structure of the full-containment tank. Using them as the insulation layer optimizes the cold insulation and load-bearing performance of the full-containment tank, helping to maintain the storage condition of liquid ammonia and ensuring the safe and stable operation of the full-containment tank.

[0026] As an optimized solution for liquid ammonia full-containment tanks, the upper surface of the insulation layer is provided with a load distribution plate for supporting the inner tank.

[0027] In this design, a load distribution plate is installed on the upper surface of the insulation layer, which can evenly distribute the weight of the inner tank and its liquid ammonia onto the insulation layer and the outer tank structure. This effectively prevents damage or deformation of the insulation layer due to excessive local pressure, thereby affecting the insulation effect and the stability of the entire container tank.

[0028] As an optimized solution for liquid ammonia full-containment tanks, the bottom of the outer tank is provided with a bottom cement slab, and the heat-insulating structure of the storage layer is laid on top of the bottom cement slab.

[0029] In this design, a bottom cement slab is filled at the bottom of the outer tank, providing a solid foundation for the entire full-containment tank and enhancing the load-bearing capacity of the tank bottom, enabling it to better support the weight of the inner tank, liquid ammonia, and the heat-trapping insulation structure. Laying the heat-trapping insulation structure on top of the bottom cement slab not only ensures the stable installation of the heat-trapping layer but also further blocks the transfer of external heat with the help of the bottom cement slab.

[0030] As an optimized solution for liquid ammonia full-containment tanks, the thickness of the bottom cement plate is 75mm-150mm.

[0031] In this design, a sufficiently thick bottom cement slab can prevent the uneven deformation of the outer tank bottom plate from affecting the construction and stress of the foam glass bricks, thereby optimizing the stress of the overall bottom insulation layer.

[0032] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0033] This invention, by setting up a heat-insulating structure with a trapping layer between the inner and outer tanks to form an annular sealed heat-insulating gap, can effectively prevent leaked liquid ammonia from directly contacting the external environment, reduce heat exchange, avoid large-area frost and condensation on the surface of the outer tank, and significantly reduce the amount of liquid ammonia vaporization and gas emissions. This significantly improves the safety of the full-containment tank under accident conditions and reduces the possibility of safety accidents such as explosions and poisoning. Attached Figure Description

[0034] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0035] Figure 1 This is a schematic diagram of the structure of this utility model.

[0036] The attached diagram shows the markings and corresponding component names:

[0037] 1-Glass cloth, 2-Insulation components, 3-CAC waterproof layer, 4-Outer tank, 5-Outer tank bottom, 6-Bottom cement board, 7-Foam glass brick, 8-Load distribution plate, 9-Inner tank bottom, 10-Inner tank. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0039] Example 1

[0040] This embodiment 1 provides a liquid ammonia full-containment tank using a non-metallic storage layer, such as... Figure 1 As shown, it includes an inner tank 10 and an outer tank 4;

[0041] A heat-trapping layer insulation structure, forming a single unit, is installed between the inner tank 10 and the outer tank 4. This structure includes an insulation component 2 and a CAC (carbon dioxide) impermeable layer 3. The insulation component 2 is made of polyurethane foam and is connected to the inner wall of the outer tank 4. This effectively prevents heat transfer, maintains a low-temperature environment inside the tank, and reduces the vaporization of liquid ammonia. The CAC impermeable layer 3 is connected to the inner wall of the insulation component, preventing leakage of liquid ammonia and ammonia gas, thus ensuring storage safety. To further enhance the heat-trapping layer insulation structure's ability to withstand liquid ammonia pressure, temperature changes, and external vibrations... For stability, a fiberglass cloth 1 is also connected to the outer wall of the insulation component 2, which can enhance the overall structural strength of the storage layer. The fiberglass cloth 1 can be connected to the inner tank wall of the outer tank 4 by pasting or bolting. In actual construction, in order to ensure that the insulation structure of the storage layer will not loosen or separate due to temperature changes in the low-temperature liquid ammonia storage environment, the fiberglass cloth 1, the insulation component 2 and the CAC seepage prevention layer 3 are bonded into a block structure with low-temperature adhesive and laid on the inner tank wall of the outer tank 4. In this way, the integrity and stability between the components will be greatly enhanced.

[0042] Among them, an annular sealing and insulation gap is formed between the outer tank wall of the inner tank 10 and the insulation structure of the storage layer. This annular sealing and insulation gap constitutes a sealed cavity, which can ensure that the leaked liquid ammonia is stored in the storage layer and does not come into direct contact with the external environment, greatly reducing heat exchange. This avoids large-area frost and condensation on the surface of the outer tank after the inner tank leaks in an accident, and significantly reduces the gas emission generated by the leaked liquid ammonia from the inner tank.

[0043] Meanwhile, a cold insulation layer is set between the bottom 9 of the inner tank 10 and the heat-insulating structure of the storage layer. This cold insulation layer is a heat-insulating structure made of foam glass bricks 7, which creates a stable low-temperature environment for the bottom of the inner tank and reduces the vaporization loss of liquid ammonia. A load distribution plate 8 for supporting the inner tank 10 is connected to the upper surface of the cold insulation layer. The load distribution plate 8 can effectively prevent the cold insulation layer from being damaged or deformed due to excessive local pressure.

[0044] Example 2

[0045] This embodiment 2 provides a liquid ammonia full-containment tank using a non-metallic storage layer, based on the solution of embodiment 1. Figure 1 As shown, the bottom 5 of the outer tank 4 is filled with a bottom cement slab 6. The aforementioned heat-insulating structure of the heat-insulating layer is laid on top of the bottom cement slab 6. This not only ensures the stable installation of the heat-insulating layer, but also further blocks the transmission of external heat with the help of the bottom cement slab 6. In some embodiments, in order to avoid the uneven deformation of the bottom plate of the outer tank from affecting the construction and stress of the foam glass bricks, the thickness of the bottom cement slab 6 is 75mm-150mm, and usually 100mm is sufficient to meet the requirements.

[0046] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A liquid ammonia full-containment tank using a non-metallic storage layer, comprising an inner tank (10) and an outer tank (4), characterized in that, A heat-insulating structure for trapping and storing heat is provided between the inner tank (10) and the outer tank (4) as a whole. An annular sealed heat-insulating gap is formed between the outer tank wall of the inner tank (10) and the heat-insulating structure for trapping and storing heat. A cold-insulating layer is provided between the bottom (9) of the inner tank (10) and the heat-insulating structure for trapping and storing heat.

2. The liquid ammonia full-containment tank using a non-metallic storage layer according to claim 1, characterized in that, The heat-insulating structure of the water-retaining layer includes heat-insulating components (2) and a CAC seepage-proof layer (3); The heat insulation component (2) is connected to the inner wall of the outer tank (4), and the CAC anti-seepage layer (3) is connected to the inner wall surface of the heat insulation component (2).

3. A liquid ammonia full-containment tank using a non-metallic storage layer according to claim 2, characterized in that, The heat-insulating structure of the heat-absorbing layer also includes glass fiber cloth (1), which is connected to the outer wall surface of the heat-insulating component (2).

4. A liquid ammonia full-containment tank using a non-metallic storage layer according to claim 3, characterized in that, The fiberglass cloth (1) is attached to the inner wall of the outer tank (4) by means of pasting or bolting.

5. A liquid ammonia full-containment tank using a non-metallic storage layer according to claim 3, characterized in that, The fiberglass cloth (1), the heat insulation component (2), and the CAC anti-seepage layer (3) are bonded together with low-temperature adhesive into a block structure and laid on the inner wall of the outer tank (4).

6. A liquid ammonia full-containment tank using a non-metallic storage layer according to any one of claims 1-5, characterized in that, The insulation component (2) is made of polyurethane foam.

7. A liquid ammonia full-containment tank using a non-metallic storage layer according to claim 6, characterized in that, The cold insulation layer is a heat insulation structure made of foam glass bricks (7).

8. A liquid ammonia full-containment tank using a non-metallic storage layer according to claim 7, characterized in that, The upper surface of the cold insulation layer is provided with a load distribution plate (8) for supporting the inner tank (10).

9. A liquid ammonia full-containment tank using a non-metallic storage layer according to claim 6, characterized in that, The bottom (5) of the outer tank (4) is provided with a bottom cement plate (6), and the heat-insulating structure of the heat-absorbing layer is laid on top of the bottom cement plate (6).

10. A liquid ammonia full-containment tank using a non-metallic storage layer according to claim 9, characterized in that, The thickness of the bottom cement board (6) is 75mm-150mm.

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