A refrigerant production batching tank

Abstract

The utility model discloses a kind of ingredients storage tanks for refrigerant production, including main tank body of vertical cylindrical shape, the bottom of main tank body is welded and connected with arc-shaped tank bottom, arc-shaped tank bottom gradually inclines downward along tank bottom outer ring to tank bottom inner ring, and discharge opening is opened at the lowest end position of inclination, discharge interface is welded and connected at discharge opening;The top opening of discharge interface is formed with chamfered bending edge, the top end of chamfered bending edge is flush with the top end surface of discharge opening, and the tank bottom wall of the arc-shaped tank bottom where chamfered bending edge and discharge opening are welded and connected is made flush with the top end surface of discharge opening.The optimization of dead angle of tank bottom structure and the design of discharge anti-vortex make dichloromethane in storage tank fully discharge, avoid excessive residual dichloromethane, and improve the problem of accelerated corrosion of storage tank weld caused by fluid accumulation.

Description

Technical Field

[0001] This utility model relates to a batching tank, and more particularly to a batching storage tank for refrigerant production. Background Technology

[0002] Difluoromethane (HFC-32), as an environmentally friendly refrigerant, is produced industrially through a fluorination reaction. The mainstream production route is the fluorination of halomethane, using dichloromethane and anhydrous hydrofluoric acid as core raw materials. HFC-32 is generated through a gas-phase substitution reaction under the action of a catalyst. Dichloromethane serves as the reaction substrate, providing the methane skeleton. It is known to be a liquid at room temperature with a boiling point of 40.1℃ and can be stored at normal pressure. Industrially, to achieve proper batching of dichloromethane, a fixed quantity is typically placed in a carbon steel or 316L stainless steel batching tank for short-term turnover. The liquid dichloromethane flowing from the batching tank is filtered to remove impurities, metered, and then transported to a static mixer where it is mixed with anhydrous hydrofluoric acid, additives, etc.

[0003] However, the carbon steel or 316L stainless steel batching tanks used for temporary storage of dichloromethane are typically designed as either a vertical cylindrical tank with a flat bottom or a vertical cylindrical tank with a conical bottom. The flat bottom, lacking a slope, prevents the liquid dichloromethane from flowing sufficiently to the discharge port, potentially exacerbating dichloromethane residue. While the conical bottom theoretically facilitates discharge, the straight-edge connections between the conical bottom and the tank body, as well as between the conical bottom and the discharge port, can create dead angles during welding, leading to liquid accumulation at the weld. This not only causes dichloromethane residue but also accelerates corrosion due to prolonged liquid retention. Utility Model Content

[0004] To address the shortcomings of the aforementioned technologies, this utility model provides a refrigerant mixing tank for refrigerant production.

[0005] To solve the above technical problems, the technical solution adopted by this utility model is: a refrigerant production batching storage tank, including a main tank body in the shape of a vertical cylinder, an arc-shaped tank bottom welded to the bottom of the main tank body, the arc-shaped tank bottom gradually sloping downwards from the outer circle of the tank bottom to the inner circle of the tank bottom, and a discharge opening is provided at the lowest point of the sloping end, and a discharge interface is welded to the discharge opening.

[0006] The top opening of the discharge port has a chamfered bend, the top of which is flush with the top surface of the discharge opening, and the chamfered bend is welded to the bottom wall of the arc-shaped tank bottom where the discharge opening is located.

[0007] Preferably, an anti-vortex plate is provided inside the discharge port.

[0008] Preferably, the anti-vortex plate consists of two plates that intersect in a cross shape and are perpendicularly distributed.

[0009] Preferably, the inner wall of the main tank and the inner wall of the arc-shaped tank bottom are both smooth surfaces with a roughness Ra≤0.8μm.

[0010] Preferably, a reinforcing ring is provided at the external location of the welded connection between the main tank body and the arc-shaped tank bottom.

[0011] Preferably, a feed inlet is welded to the top wall of the main tank, and a feed valve is connected to the feed inlet. The discharge port is connected to a discharge valve.

[0012] Preferably, a maintenance handhole is also provided on the top wall of the main tank.

[0013] Preferably, a temperature sensor and a liquid level sensor are also installed on the top wall of the main tank, with the probes of the temperature sensor and the liquid level sensor extending into the main tank.

[0014] Preferably, a breather valve is also installed on the top wall of the main tank.

[0015] Preferably, the top wall of the main tank is also equipped with lifting lugs distributed in a four-corner pattern.

[0016] This utility model discloses a refrigerant production mixing tank, which adopts an arc-shaped tank bottom combined with a slope design to concentrate the dichloromethane discharged to the discharge port. Simultaneously, the connection between the discharge port and the arc-shaped tank bottom is designed with a rounded transition chamfer to ensure sufficient discharge of the dichloromethane flowing to the discharge port. Finally, the anti-vortex plate prevents false emptying. In summary, this new invention, through the optimization of the dead angle of the tank bottom structure and the anti-vortex design for discharge, ensures the full discharge of dichloromethane from the storage tank, avoiding excessive dichloromethane residue and mitigating the problem of accelerated weld corrosion caused by liquid accumulation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0018] Figure 2 for Figure 1 The main view.

[0019] Figure 3 This is a schematic diagram showing the connection between the arc-shaped tank bottom and the discharge interface of this utility model.

[0020] Figure 4 for Figure 3 A magnified schematic diagram of the structure at point A in the middle.

[0021] Figure 5 This is a schematic diagram of the material discharge interface of this utility model.

[0022] Figure 6 for Figure 5 A schematic diagram of the structure of the anti-vortex plate.

[0023] In the diagram: 1. Main tank body; 2. Support leg; 3. Inspection manhole; 4. Liquid level sensor; 5. Temperature sensor; 6. Feed port; 7. Feed valve; 8. Breathing valve; 9. Lifting lug; 10. Reinforcing ring; 11. Discharge valve; 12. Arc-shaped tank bottom; 13. Discharge port; 13a. Chamfered bend edge; 14. Anti-vortex plate; 15. Discharge opening. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0025] Example 1

[0026] This embodiment discloses a refrigerant production batching storage tank, the overall structure of which is as follows: Figure 1 and Figure 2 As shown, it includes a main tank body 1 in the shape of a vertical cylinder, and an arc-shaped tank bottom 12 welded to the bottom of the main tank body 1.

[0027] like Figure 3 As shown, the arc-shaped tank bottom 12 gradually slopes downwards from the outer ring of the tank bottom to the inner ring of the tank bottom to present a slope design feature. A circular opening is provided at the lowest point of the slope. The circular opening serves as the discharge opening 15 and is used to weld and connect the discharge interface 13.

[0028] like Figure 4 and Figure 5 As shown, a chamfered bend edge 13a is formed at the top opening of the discharge port 13. The chamfered bend edge 13a is formed by bending process with a radius r = 30-50mm rounded corner, which can avoid the traditional straight dead corner. The bend arc convexes into the tank body, ensuring that the dichloromethane liquid flowing to the discharge port 15 along the slope due to gravity can flow smoothly along the arc surface, thereby fully realizing the discharge of dichloromethane.

[0029] Furthermore, the arc-shaped tank bottom 12 and the discharge port 13 are specifically connected by welding to the bottom wall of the arc-shaped tank bottom 12 where the discharge opening 15 is located through a chamfered and bent edge 13a, as shown below. Figure 4As shown, after the welding connection is completed, the top of the chamfered edge 13a must be flush with the top surface of the discharge opening 15 so that the chamfered edge 13a can smoothly connect the sloped bottom wall of the tank and the discharge interface. Thus, by extending the discharge interface 13 to the top of the discharge opening of the arc-shaped tank bottom 12 and connecting it using the chamfered edge 13a, the dead-angle structure of the traditional batching storage tank bottom and discharge interface welded together with right-angled edges is eliminated. This avoids the accumulation of dichloromethane in the dead-angle position, reducing dichloromethane residue and effectively improving the problem of accelerated tank corrosion caused by liquid accumulation.

[0030] Correspondingly, for example Figure 3 As shown, the arc-shaped tank bottom 1 has a large arc design and no dead corners. Its top has a circular opening with the same diameter as the bottom of the main tank body 1. The arc-shaped tank bottom 12 is welded to the main tank body 1 after being spliced ​​together.

[0031] Preferably, a reinforcing ring 10 can be further welded to the external position of the welded connection between the main tank body 1 and the arc-shaped tank bottom 12 to further enhance the structural strength of the batching storage tank.

[0032] Furthermore, it should be noted that after the arc-shaped tank bottom 12 is formed by CNC punching, it is first welded to the discharge interface 13, and then welded to the main tank body 1. Submerged arc welding is used to weld from the inside out to ensure that the weld is free of defects such as incomplete penetration, porosity, and cracks. After welding, post-weld heat treatment is performed to eliminate welding stress and restore corrosion resistance. In addition, the slope of the arc-shaped tank bottom 12 is checked after welding. If the weld protrudes, it needs to be ground. A laser rangefinder is used to detect the height of each point on the tank bottom and calculate the slope deviation to be ≤±0.5‰ to ensure that the entire tank bottom has no reverse slope or dead angles, so that the chamfered and bent edge 13a can smoothly connect the arc-shaped tank bottom 12 and the discharge interface 13.

[0033] Furthermore, the refrigerant production mixing tank disclosed in this embodiment adopts the existing mixing tank design, such as... Figure 1 As shown, a feed port 6 is welded to the top wall of the main tank 1. The feed port 6 is connected to a feed valve 7, which is used to control the opening and closing of the feed port 6. Similarly, a discharge port 13 is connected to a discharge valve 11, which controls the opening and closing of the discharge port 13.

[0034] Furthermore, a temperature sensor 5, a liquid level sensor 4, a breather valve 8, and a maintenance manhole 3 are also installed on the top wall of the main tank 1. The level sensor 4 can be a capacitive level gauge, with its probe extending into the main tank 1. Its measuring range must cover the effective volume of the tank, with an accuracy of ±1mm, and it provides real-time feedback of the level to the PLC system. The temperature sensor probe extends into the main tank 1 to measure the internal temperature and provide feedback to the PLC system. Its measuring range is -10℃ to 60℃, with an accuracy of ±0.5℃. It is linked to an external spray cooling system via the PLC system. If the ambient temperature exceeds a preset value, cooling is activated to prevent excessive dichloromethane volatilization due to high internal temperature. A breather valve is installed at the top of the main tank 1. A flame-arresting breather valve with a stainless steel flame-arresting core is used to balance the internal pressure (venting during feeding and replenishing during discharging), preventing negative pressure from causing tank deformation or positive pressure from causing leakage. The maintenance manhole 3 primarily facilitates the maintenance of this storage tank. It can be a flange-type bolt-tightened maintenance manhole structure. The manhole cover is connected to the flange of the manhole cylinder, with a sealing gasket in between. Bolts are used for even tightening to ensure a tight seal.

[0035] In summary, the refrigerant production mixing tank disclosed in this embodiment is designed with an arc-shaped tank bottom without dead corners, which reduces the residue of dichloromethane. Furthermore, the arc-shaped tank bottom has a slope, which allows dichloromethane to gather from the surrounding area towards the discharge opening at the lower center point under the action of gravity. After transitioning through the chamfered and bent edge 13a, it is smoothly discharged into the discharge interface 13. Due to the improved design of the tank bottom and the discharge interface, on the one hand, the existence of dead corners is reduced, effectively reducing the residue of dichloromethane. On the other hand, the accumulation of dichloromethane is improved, which can further improve the problem of accelerated corrosion caused by accumulation.

[0036] Example 2

[0037] This embodiment discloses a refrigerant production batching storage tank. Based on the structure disclosed in Embodiment 1, the inner wall of the main tank body 1 and the inner wall of the arc-shaped tank bottom 12 are further polished to make them smooth surfaces with a roughness Ra≤0.8μm. The smooth surface can reduce the adhesion of dichloromethane liquid, thereby further reducing residue.

[0038] Furthermore, as a preferred embodiment, such as Figure 5 and Figure 6 As shown, an anti-vortex plate 14 can be installed inside the discharge port 13. The anti-vortex plate 14 consists of two plates that intersect in a cross shape and are vertically distributed. The material is the same as that of the storage tank, such as 316L stainless steel or carbon steel. The design parameters such as the height and size of the anti-vortex plate 14 can be specifically set according to the storage tank capacity and the diameter of the liquid discharge port pipe. It disperses the liquid kinetic energy through turbulence and suppresses the formation of vortices during discharge, thereby avoiding false emptying and further reducing the residue of dichloromethane.

[0039] In addition, lifting lugs 9 are installed at the top wall of the main tank in a four-corner arrangement to facilitate the hoisting and transportation of this storage tank equipment; the entire storage tank is supported on the support legs 2 to lift the tank off the ground and reserve sufficient space for the external equipment connected to the discharge port 13.

[0040] In summary, the refrigerant production mixing tank disclosed in this embodiment effectively reduces the residue of dichloromethane in the tank and improves the problem of accelerated tank corrosion caused by liquid accumulation by using the arc-shaped tank bottom design, the chamfered and bent edge design of the discharge interface, the smooth inner surface design of the tank, and the anti-vortex design.

[0041] The above embodiments are not intended to limit the present utility model, nor is the present utility model limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the technical solution of the present utility model are also within the protection scope of the present utility model.

Claims

1. A refrigerant production batching storage tank, comprising a main tank body (1) in the shape of a vertical cylinder, characterized in that: The bottom of the main tank (1) is welded to an arc-shaped tank bottom (12). The arc-shaped tank bottom (12) gradually slopes downward from the outer ring of the tank bottom to the inner ring of the tank bottom, and a discharge opening (15) is provided at the lowest point of the slope. A discharge interface (13) is welded to the discharge opening (15). The top opening of the discharge port (13) has a chamfered bend (13a) formed, the top of the chamfered bend (13a) is flush with the top surface of the discharge opening (15), and the chamfered bend (13a) is welded to the bottom wall of the arc-shaped tank bottom (12) where the discharge opening (15) is located.

2. The refrigerant production batching and storage tank according to claim 1, characterized in that: An anti-vortex plate (14) is provided inside the discharge port (13).

3. The refrigerant production batching and storage tank according to claim 2, characterized in that: The anti-vortex plate (14) consists of two plates that intersect in a cross shape and are perpendicularly distributed.

4. The refrigerant production batching and storage tank according to claim 1, characterized in that: The inner wall of the main tank (1) and the inner wall of the arc-shaped tank bottom (12) are both smooth surfaces with a roughness Ra≤0.8μm.

5. The refrigerant production batching and storage tank according to claim 1, characterized in that: A reinforcing ring (10) is provided at the external position of the welded connection between the main tank body (1) and the arc-shaped tank bottom (12).

6. The refrigerant production batching and storage tank according to claim 1, characterized in that: The main tank (1) is welded to the top wall with a feed port (6) and a feed valve (7) is connected to the feed port (6). The discharge port (13) is connected to a discharge valve (11).

7. The refrigerant production batching and storage tank according to claim 6, characterized in that: The main tank (1) is also provided with a maintenance handhole (3) on the top wall.

8. The refrigerant production batching and storage tank according to claim 7, characterized in that: Temperature sensor (5) and liquid level sensor (4) are also installed on the top wall of the main tank (1), and the probes of temperature sensor (5) and liquid level sensor (4) extend into the main tank (1) respectively.

9. The refrigerant production batching and storage tank according to claim 8, characterized in that: A breather valve (8) is also installed on the top wall of the main tank (1).

10. The refrigerant production batching and storage tank according to claim 9, characterized in that: The main tank (1) is also equipped with lifting lugs (9) arranged in a four-corner pattern on the top wall.

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