Nitrogen replacement device for storage tank

Abstract

The utility model relates to the technical field of pressure containers, in particular to a nitrogen replacement device for a storage tank. The storage tank specifically comprises a storage tank body, a nitrogen inlet is formed in the side wall close to the bottom face of the storage tank, the nitrogen inlet is connected with a nitrogen inlet pipeline, the nitrogen inlet pipeline penetrates through the nitrogen inlet and then is arranged on the bottom face in the storage tank, a plurality of air dispersing pipes are further arranged on the nitrogen inlet pipeline in the storage tank, a plurality of air dispersing holes are formed in each air dispersing pipe, and the air dispersing holes are communicated with the nitrogen inlet pipeline. A nitrogen inlet pipeline on the outer side of the storage tank is connected with a nitrogen storage tank, and nitrogen enters the storage tank from the nitrogen inlet pipeline and is discharged through the vent holes. The nitrogen storage tank has the advantages that the uniform distribution degree of nitrogen in the storage tank is improved, and the consumption of the nitrogen can be reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure vessels, in particular to a nitrogen replacement device for a storage tank. Background Art

[0002] Storage tanks are often used to store petroleum products such as heavy aromatics and naphtha. Nitrogen is introduced into the tank to displace the oil and gas, forming a nitrogen-sealed tank to store petroleum products.

[0003] In the prior art, application number 202321750199.0 provides a nitrogen sealing device for a storage tank, which aims to solve the problem of excessive pressure difference between the inside and outside of the tank and waste of excess nitrogen caused by discharge during material discharge; it includes a nitrogen sealed storage tank, a nitrogen discharge pipe is fixed at the upper end of the nitrogen sealed storage tank, and a nitrogen replenishing mechanism is provided at the end of the nitrogen discharge pipe, the nitrogen replenishing mechanism includes a nitrogen storage box, a first stop valve, a connecting pipe and a nitrogen indicating airbag, and the nitrogen storage box is fixed on the outer surface of the nitrogen sealed storage tank; it can prevent the air from being inhaled and oxidized due to negative pressure problems in the nitrogen sealed storage tank, and can improve the situation where nitrogen is squeezed out and waste is caused when traditional oil is filled.

[0004] In the above technical solution, when nitrogen is passed through, the nitrogen exhaust pipe is placed at the upper end of the nitrogen-sealed storage tank, and the nitrogen completes the nitrogen sealing by squeezing the air or oil gas in the tank when entering the storage tank; in the storage tank, the nitrogen is in a dispersed state during the squeezing process, the nitrogen concentration at the entrance of the nitrogen exhaust pipe is higher, and the concentration at other positions is lower. In order to quickly complete the nitrogen sealing and preserve the petroleum products, the nitrogen exhaust pipe needs to continuously discharge a large amount of nitrogen to meet the nitrogen concentration requirement in the storage tank, which causes a waste of nitrogen.

[0005] How to provide a nitrogen replacement device for a storage tank to improve the uniform distribution of nitrogen in the storage tank and reduce the consumption of nitrogen is an urgent problem to be solved by those skilled in the art. Utility Model Content

[0006] In order to solve the above problems, the utility model provides a nitrogen replacement device for a storage tank.

[0007] The technical solution of the utility model is: a nitrogen replacement device for a storage tank, comprising a storage tank body, a nitrogen inlet is arranged on the side wall adjacent to the bottom surface of the storage tank, the nitrogen inlet is connected to a nitrogen inlet pipeline, the nitrogen inlet pipeline passes through the nitrogen inlet and is arranged on the bottom surface of the storage tank, a plurality of diffuser pipes are also arranged on the nitrogen inlet pipeline in the storage tank, each of the diffuser pipes is provided with a plurality of diffuser holes, the nitrogen inlet pipeline outside the storage tank is connected to the nitrogen storage tank, nitrogen enters the storage tank from the nitrogen inlet pipeline and is discharged from the diffuser holes.

[0008] Furthermore, the nitrogen inlet pipeline is in a "T" shape in the storage tank, the "T"-shaped top of the nitrogen inlet pipeline is arranged at the center of the bottom surface of the storage tank, and the "T"-shaped bottom of the nitrogen inlet pipeline is connected to the nitrogen inlet port; a plurality of the diffuser pipes are connected in parallel with each other and fixed on the top of the nitrogen inlet pipeline, and are connected to the top of the nitrogen inlet pipeline and form a "cross".

[0009] Furthermore, the nitrogen inlet pipeline is in the shape of an "I" in the storage tank, and an "O"-shaped ventilation ring is connected to one end of the nitrogen inlet pipeline. The ventilation ring is arranged at the center of the bottom surface of the storage tank, and multiple diffusion pipes are evenly connected on the ventilation ring. The diffusion pipes are arranged on the bottom surface of the storage tank around the ventilation ring.

[0010] Furthermore, the diameters of the multiple air diffusion holes on each of the air diffusion pipes gradually increase from the center of the storage tank toward the outside, and the spacing between the air diffusion holes gradually decreases.

[0011] Furthermore, a sealing structure is provided between the nitrogen inlet and the nitrogen inlet pipeline; the nitrogen inlet pipeline outside the storage tank is in a "J" shape, and the height of the "J"-shaped nitrogen inlet pipeline is higher than the storage tank; a stop valve is provided on the nitrogen inlet pipeline near the outside of the storage tank.

[0012] The beneficial effects of the utility model are as follows: by arranging a plurality of diffuser pipes on the bottom surface of the storage tank, and by arranging the diffuser pipes in parallel or surrounding each other at the bottom of the storage tank, the nitrogen can be guided to be dispersed in the storage tank. After the nitrogen enters the diffuser pipe from the nitrogen inlet pipeline, the nitrogen starts to diffuse from the bottom of the storage tank. The air or oil gas in the storage tank can be replaced by the extrusion of the nitrogen, and the gas is discharged from the gas outlet on the storage tank to complete the nitrogen sealing work. The diffuser holes are opened on the diffuser pipe, so that the diffusion outlet of the nitrogen is increased in the storage tank, the uniform distribution of the nitrogen in the storage tank is improved, and the nitrogen sealing work efficiency of the storage tank is improved, thereby reducing the consumption of nitrogen.

[0013] The diameter of the diffusion holes on each diffusion pipe increases gradually from the center of the storage tank to the outside, and the spacing between the diffusion holes decreases gradually; by gradually increasing the diameter and gradually decreasing the spacing from the center to the outside, it can be avoided that when nitrogen is input into the storage tank from the nitrogen inlet pipeline, the nitrogen concentration is high at the first contact position and low at other positions; by setting the gradually increasing diameter and gradually decreasing hole spacing, the pressure is used to disperse the nitrogen output, which further ensures the uniform distribution of nitrogen in the storage tank and reduces the nitrogen consumption.

[0014] The nitrogen inlet pipeline on the outside of the storage tank is in a "J" shape, and its height is higher than the storage tank. By utilizing the principle of the liquid level communicating device, it can prevent the liquid in the tank from flowing back to the nitrogen storage tank, thereby avoiding the loss of liquid in the tank and also avoiding damage to the nitrogen storage tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the internal structure of a storage tank in Example 1 of the utility model;

[0016] Figure 2 This is a schematic diagram of the internal structure of a storage tank in Example 2 of the utility model;

[0017] Figure 3 It is a schematic diagram of the external structure of the storage tank of the utility model;

[0018] In the figure:

[0019] 1. Storage tank body 1-1, gas outlet 2, nitrogen inlet pipeline

[0020] 2-1, stop valve 3, air diffuser pipe 3-1, air diffuser hole

[0021] 3-2, ventilation ring 3-3, nitrogen inlet pipe DETAILED DESCRIPTION

[0022] Example 1

[0023] A nitrogen replacement device for a storage tank comprises a storage tank body 1, a nitrogen inlet is provided on the side wall adjacent to the bottom of the storage tank, the nitrogen inlet is connected to a nitrogen inlet pipeline 2, the nitrogen inlet pipeline 2 penetrates the nitrogen inlet and is arranged on the bottom of the storage tank, the nitrogen inlet pipeline 2 in the storage tank is a nitrogen inlet main pipe 3-3, a plurality of diffuser pipes 3 are further provided on the nitrogen inlet main pipe 3-3, each diffuser pipe 3 is provided with a plurality of diffuser holes 3-1, the nitrogen inlet pipeline outside the storage tank is connected to a nitrogen storage tank, nitrogen enters the storage tank from the nitrogen inlet pipeline 2 and is discharged from the diffuser holes 3-1.

[0024] Furthermore, the nitrogen inlet main pipe 3-3 is in a "T" shape in the storage tank, the top of the nitrogen inlet main pipe 3-3 is arranged at the center of the bottom surface of the storage tank, and the bottom of the nitrogen inlet main pipe 3-3 is connected to the nitrogen inlet port; multiple diffuser pipes 3 are connected in parallel with each other and fixed on the nitrogen inlet main pipe 3-3 by welding, and the multiple diffuser pipes 3 are respectively connected to the top of the nitrogen inlet main pipe 3-3 and form a "cross" shape; wherein the multiple diffuser pipes 3 are of equal or unequal lengths, and multiple diffuser holes 3-1 are arranged on each diffuser pipe 3, and the aperture gradually increases from the center position of the storage tank to the outside, and the spacing between the diffuser holes 3-1 gradually decreases.

[0025] During operation, nitrogen is output from the nitrogen storage tank, flows through the nitrogen inlet pipeline 2 outside the storage tank and then enters the storage tank, and is transported into the diffuser pipe 3 through the nitrogen inlet main pipe 3-3. A plurality of diffuser pipes 3 are arranged in parallel at the bottom of the storage tank, and the nitrogen is transported into different diffuser pipes 3, and then the nitrogen is evenly dispersed in the storage tank through the diffuser holes 3-1 arranged on the diffuser pipes 3. The aperture gradually increases from the center position of the storage tank to the outside, and the spacing between the diffuser holes 3-1 gradually decreases, which ensures that the nitrogen is output from the center position of the bottom of the storage tank, and the amount of nitrogen diffused from all the diffuser holes 3-1 on the diffuser pipe 3 is equivalent, and the concentration will not be different due to different distances from the center position, which ensures the uniform distribution of nitrogen in the storage tank and reduces the consumption of nitrogen. Among them, the distribution of the diffuser pipes 3 can be arranged in an axisymmetric manner along the nitrogen inlet pipeline 2, and the lengths thereof are symmetrical and the same and cover the bottom of the storage tank, which further ensures the uniform distribution of nitrogen in the storage tank and reduces the consumption of nitrogen.

[0026] Example 2

[0027] A nitrogen replacement device for a storage tank comprises a storage tank body 1, a nitrogen inlet is provided on a side wall adjacent to the bottom of the storage tank, the nitrogen inlet is connected to a nitrogen inlet pipeline 2, the nitrogen inlet pipeline 2 penetrates the nitrogen inlet and is arranged on the bottom of the storage tank, the nitrogen inlet pipeline 2 in the storage tank is a nitrogen inlet main pipe 3-3, a plurality of diffuser pipes 3 are further provided on the nitrogen inlet main pipe 3-3, each diffuser pipe 3 is provided with 5-7 diffuser holes 3-1, the nitrogen inlet pipeline 2 outside the storage tank is connected to a nitrogen storage tank, nitrogen enters the storage tank from the nitrogen inlet pipeline 2 and is discharged from the diffuser holes 3-1.

[0028] Furthermore, the nitrogen inlet main pipe 3-3 is in the shape of an "I" in the storage tank, and an "O"-shaped ventilation ring 3-2 is connected to one end of the nitrogen inlet main pipe 3-3. The ventilation ring 3-2 is arranged at the center of the bottom surface of the storage tank, and multiple diffuser pipes 3 are evenly connected on the ventilation ring 3-2. The diffuser pipes 3 are arranged on the bottom surface of the storage tank around the ventilation ring 3-2.

[0029] Furthermore, each air diffusion pipe 3 is of equal length, and 5-7 air diffusion holes 3-1 are provided on each air diffusion pipe 3. From the center of the storage tank to the outside, the hole diameter gradually increases, and the spacing between the air diffusion holes 3-1 gradually decreases.

[0030] Furthermore, a sealing structure is provided between the nitrogen inlet and the nitrogen inlet pipeline 2 to prevent leakage of liquid or gas in the storage tank; the nitrogen inlet pipeline 2 outside the storage tank is in a "J" shape, and the height of the "J"-shaped nitrogen inlet pipeline 2 is higher than the storage tank; a stop valve 2-1 is provided on the nitrogen inlet pipeline 2 near the outside of the storage tank.

[0031] During operation, when the storage tank is empty before being loaded with petroleum products and the nitrogen storage tank is opened, the nitrogen squeezes the air in the storage tank, and the squeezed air is discharged through the air outlet arranged on the top of the storage tank; when the storage tank is loaded with products, the nitrogen is gradually output from the air diffusion hole 3-1, continuously impacting the petroleum products to replace the oil and gas, and the squeezed oil and gas after the impact are discharged from the air outlet, thereby improving the stability of the petroleum products in the storage tank.

[0032] The above is a detailed description of an embodiment of the utility model, but the content is only a preferred embodiment of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of application of the utility model should still fall within the scope of the patent coverage of the utility model.

Claims

1. A nitrogen replacement device for a storage tank, characterized in that: The invention comprises a storage tank body, wherein a nitrogen inlet is arranged on the side wall adjacent to the bottom of the storage tank, the nitrogen inlet is connected to a nitrogen inlet pipeline, the nitrogen inlet pipeline passes through the nitrogen inlet and is arranged on the bottom of the storage tank, a plurality of diffuser pipes are arranged on the nitrogen inlet pipeline in the storage tank, each diffuser pipe is provided with a plurality of diffuser holes, the nitrogen inlet pipeline outside the storage tank is connected to a nitrogen storage tank, and nitrogen enters the storage tank from the nitrogen inlet pipeline and is discharged from the diffuser holes.

2. A nitrogen replacement device for a storage tank according to claim 1, characterized in that: The nitrogen inlet pipeline is in a "T" shape in the storage tank, the "T"-shaped top of the nitrogen inlet pipeline is arranged at the center of the bottom surface of the storage tank, and the "T"-shaped bottom of the nitrogen inlet pipeline is connected to the nitrogen inlet port; a plurality of the diffuser pipes are connected in parallel with each other and fixed on the top of the nitrogen inlet pipeline, and are connected to the top of the nitrogen inlet pipeline and form a "cross".

3. A nitrogen replacement device for a storage tank according to claim 1, characterized in that: The nitrogen inlet pipeline is in the shape of an "I" in the storage tank, and an "O"-shaped ventilation ring is connected to one end of the nitrogen inlet pipeline. The ventilation ring is arranged at the center of the bottom surface of the storage tank, and multiple diffusion pipes are evenly connected on the ventilation ring. The diffusion pipes are arranged on the bottom surface of the storage tank around the ventilation ring.

4. A nitrogen replacement device for a storage tank according to any one of claims 1 to 3, characterized in that: Each of the air diffusion pipes is provided with a plurality of air diffusion holes, and the hole diameter increases gradually from the center position of the air diffusion hole storage tank to the outside, and the spacing between the air diffusion holes decreases gradually.

5. A nitrogen replacement device for a storage tank according to any one of claims 1 to 3, characterized in that: A sealing structure is provided between the nitrogen inlet and the nitrogen inlet pipeline; the nitrogen inlet pipeline outside the storage tank is in a "J" shape, and the height of the "J"-shaped nitrogen inlet pipeline is higher than the storage tank; a stop valve is provided on the nitrogen inlet pipeline near the outside of the storage tank.

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