Phase change heat storage tank transformed from idle storage tank in oil field

Abstract

The invention provides a phase change heat storage tank transformed from an oil field idle storage tank, and belongs to the technical field of energy storage. The phase change heat storage tank comprises a tank body and a phase change heat storage device arranged in the tank body; the phase change heat storage device comprises a phase change stacking bed mounting bracket; the plurality of layers of phase-change ball stacking beds are arranged on the phase-change stacking bed mounting bracket, and phase-change ball mounting holes for mounting phase-change balls are uniformly distributed in the phase-change ball stacking beds; the vertical lifting device is arranged on the phase change stacking bed mounting bracket and is used for driving the phase change ball stacking bed to lift; and the flow equalizing plate is arranged at the bottommost end of the phase change stacking bed mounting bracket. According to the system, the idle storage tank can be utilized in a multi-stage mode, old transformation of the idle storage tank of the oil depot is achieved, heat is absorbed and released through the built-in phase change heat storage device, and efficient heat storage is achieved.

Description

Technical Field

[0001] The invention relates to the field of energy storage technology, and in particular to a phase change heat storage tank transformed from an idle storage tank in an oil field. Background Art

[0002] At present, the heat storage tanks that meet the heat demand of oil depots have problems such as large floor space, low heat storage density, low energy utilization rate and fixed storage capacity. Sensible heat storage technology is limited in dealing with these challenges. To solve these problems, phase change heat storage technology has attracted widespread attention. Compared with sensible heat storage technology, phase change heat storage technology has unique advantages, including high heat storage density, stable temperature control range, high efficiency and durability, and controllability. By storing heat energy during off-peak hours and then releasing it during peak hours, phase change heat storage technology can reduce dependence on traditional energy, effectively reduce energy waste, and help achieve efficient utilization of sustainable energy. At the same time, as oil production enters its final stage, there are a large number of idle storage tanks in oil depots. These huge containers become redundant when oil field production slows down or oil demand decreases, and these tanks usually face the problem of abandonment and environmental pollution. Therefore, applying phase change heat storage technology to these abandoned storage tanks can not only effectively solve the problem of energy storage and release, but also provide an innovative solution for the reuse of abandoned containers. Summary of the invention

[0003] In view of this, in order to solve the technical problems of a large number of idle storage tanks in the oil depot in the prior art, which are faced with abandonment and environmental pollution, the present invention provides a phase change heat storage tank for the transformation of idle storage tanks in oil fields, which can make multi-level utilization of idle storage tanks, realize the aging transformation of idle storage tanks in oil depots, and realize efficient heat storage by absorbing and releasing heat through a built-in phase change heat storage device.

[0004] To achieve the above object, the present invention provides the following technical solutions: A phase-change heat storage tank for transformation of idle oilfield storage tanks, comprising a tank body and a phase-change heat storage device arranged in the tank body; The phase change heat storage device comprises: Phase change stacked bed mounting bracket; A plurality of layers of phase change ball stacking beds are arranged on the phase change stacking bed mounting bracket, and phase change ball mounting holes for mounting phase change balls are evenly distributed on the phase change ball stacking beds; A vertical lifting device, arranged on the phase change stacked bed mounting bracket, for driving the phase change ball stacked bed to rise and fall; The flow equalizing plate is arranged at the bottom end of the phase change stacked bed mounting bracket.

[0005] Preferably, diffuser holes are provided on the phase change ball packed bed and the flow equalizing plate.

[0006] Preferably, a temperature sensor is provided inside the phase change balls on each layer of the phase change ball stacking bed.

[0007] Preferably, a manhole is provided on the tank body, and an integrated passage for people and cargo is provided inside the tank body.

[0008] Preferably, the integrated passenger and cargo passage comprises: Bracket; A pedal, disposed between the brackets; A slide groove is arranged on one side of the bracket.

[0009] Preferably, the phase change ball comprises: The phase change ball shell is used to contain the phase change material; The sealing cover has one end screwed to the phase change material inlet on the phase change ball shell, and the other end screwed to the fixing device.

[0010] Preferably, a heat exchange device is provided in the phase change ball.

[0011] Preferably, the fixing device comprises: a fixing device base, which is screwed to the other end of the cover; A spring, with two ends respectively connected to the fixing rods; The fixing rod has one end which is rotatably connected to the fixing device base through a rotating shaft, and the other end which is a movable end, and the distance between the end points is controlled by the expansion and contraction of the spring.

[0012] Preferably, the vertical lifting device is a worm gear motor, and the worm gear motor is screwed to the phase change stacking bed mounting bracket.

[0013] Preferably, the phase change stacked bed mounting brackets have several groups, and each group of the phase change stacked bed mounting brackets consists of three threaded rods.

[0014] The phase change heat storage tank for transforming idle oil field tanks provided by the present invention can make multi-level use of idle tanks, realize the transformation of idle oil depot tanks, and absorb and release heat through the built-in phase change heat storage device to achieve efficient heat storage. Compared with the prior art, it has the following beneficial effects: (1) The phase change heat storage tank provided by the present invention is a phase change heat storage tank transformed from an idle storage tank in an oil field. On the basis of the existing idle storage tanks in the oil depot, it is transformed into a phase change heat storage tank for multi-stage utilization, making full use of the advantages of the high heat storage density of the phase change material, improving the heat storage capacity of the phase change water tank, and increasing the heat exchange area of ​​the phase change material and enhancing the heat storage and release rate by arranging phase change balls of different sizes in layers. Considering the temperature stratification phenomenon of large-volume water tanks, the vertical lifting device is used to control the spacing of the phase change filling beds and the heat storage capacity of the phase change water tank.

[0015] (2) In addition, the present invention also provides a stable support for the phase change ball through a fixing device to prevent it from shaking or displacement during the heat exchange process, thereby ensuring the stability and safety of the phase change heat storage tank. At the same time, the vertical lifting function of the worm gear motor is used to achieve precise adjustment of the spacing of the phase change packed beds, thereby effectively controlling the heat storage capacity of the phase change water tank, meeting the heat storage requirements in different scenarios, achieving the effect of flexibly controlling the temperature distribution of the water tank and the variable storage capacity, and broadening the scope of application of the phase change heat storage tank.

[0016] (3) The present invention arranges phase change balls of different sizes at different heights based on the temperature stratification phenomenon of a large-volume water tank, thereby realizing multi-stage utilization of the heat transfer fluid.

[0017] (4) The present invention organically combines the phase change ball with the fixing device, which facilitates the installation and disassembly of the phase change ball. Metal fins are built into the phase change ball, which effectively improves the heat storage and release rate of the phase change ball.

[0018] (5) The integrated passenger-cargo passage in the present invention not only facilitates the passage of staff, but also adds a chute for transporting phase change balls, which effectively improves the work efficiency of staff during the maintenance process of the phase change heat storage device.

[0019] In summary, the present invention achieves three objectives: ① High-value transformation of idle storage tanks in oil fields, saving the construction cost of phase change heat storage tanks and solving the environmental problems that may be caused by abandoned storage tanks.

[0020] ② A phase-change heat storage device with graded utilization and variable storage capacity to maximize the storage of thermal energy of the heat transfer fluid.

[0021] ③ The phase change balls can be automatically fixed on the phase change ball pile bed, reducing the installation cost of the phase change balls. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional view of the internal structure of the present invention; Figure 2 It is a schematic diagram of the phase change heat storage device of the present invention; Figure 3 It is a schematic diagram of the phase change ball structure of the present invention; Figure 4 It is a front view of the structure of the vertical lifting device of the present invention; Figure 5 It is a side view of the structure of the vertical lifting device of the present invention; Figure 6 It is a schematic diagram of the structure of the integrated passage for people and goods of the present invention.

[0023] In the figure, 1. fluid inlet; 2. manhole; 3. flow equalizing plate; 4. phase change ball; 41. cover; 42. base of fixing device; 43. fixing rod; 44. shell of phase change ball; 45. phase change material; 46. metal fin; 47. spring; 48. rotating shaft; 5. mounting bracket of phase change stacking bed; 6. stacking bed of phase change balls; 7. tank wall; 8. vertical lifting device; 81. worm; 82. worm gear; 83. motor; 84. tapered roller bearing; 85. transmission shaft; 9. light transmission hole; 10. breathing valve; 11. liquid measuring hole; 12. fluid outlet; 13. integrated passage for people and goods; 131. handrail; 132. pedal; 133. bracket; 134. slide; 14. bottom drain outlet. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", "top / bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] like Figure 1-6 As shown, the present invention provides a phase change heat storage tank transformed from an idle oil field storage tank, comprising a tank body and a phase change heat storage device arranged in the tank body. The tank body is made of an idle oil field storage tank, preferably a dome tank, and its nominal volume is preferably 100m 3The design and construction of the dome tank meets the GBJ128 "Vertical Cylindrical Steel Welded Oil Tank Construction and Acceptance Specifications". Its nominal diameter is preferably DN5000, and the tank wall 7 is made of four-layer steel plates, and the material used is Q235-A. The light-transmitting hole 9, the breathing valve 10, and the liquid-measuring hole 11 are distributed in the arch part, with nominal diameters of DN500, DN300, and DN150 respectively. The manhole 2 is located on the tank wall 7, with a nominal diameter of DN600. The fluid inlet 1 is located on the tank wall 7, 100 mm from the bottom, with a nominal diameter of DN50 and a protruding height of 200 mm. The fluid outlet 12 is located on the tank wall 7, 5000 mm from the bottom, with a nominal diameter of DN50 and a protruding height of 200 mm. Temperature and flow sensors are set at the fluid inlet and outlet, and a temperature sensor is set in the upper part of the water body of the phase change heat storage tank. The bottom water outlet 14 is located on the opposite side of the fluid inlet 1, 50 mm from the bottom, with a nominal diameter of DN50 and a protruding height of 200 mm. The inner wall of the tank is sprayed with a double layer of anti-corrosion coating, and composite silicate is used as insulation material on the side wall.

[0028] The phase change heat storage device comprises: The phase change stacking bed mounting bracket 5 preferably has several groups, each group of the phase change stacking bed mounting bracket 5 is composed of three threaded rods. Such a design can provide a stronger support structure and is also convenient for adjusting the height and position to meet different needs. More preferably, the phase change stacking bed mounting bracket 5 is divided into four groups, each group is composed of three DN350 threaded rods, and is welded and fixed to the bottom plate of the tank body, which can more evenly disperse the pressure and weight and improve the stability of the entire system.

[0029] Several layers of phase change ball stacking beds 6 are arranged on the phase change stacking bed mounting bracket 5, and phase change ball mounting holes for mounting phase change balls 4 are evenly distributed thereon. Among them, the phase change ball stacking bed 6 is preferably a stainless steel plate, and phase change ball mounting holes of different sizes are evenly distributed on different layers of phase change ball stacking beds 6. The size of the phase change ball mounting holes of each layer of the phase change ball stacking bed 6 corresponds to the size of different phase change balls 4. By using phase change ball mounting holes of different sizes in different layers, phase change balls 4 of different sizes can be accommodated. Larger-sized phase change balls 4 may be more suitable for installation in certain layers to provide greater heat storage capacity and better heat exchange effect. This design can also improve the flexibility and adaptability of the stacking bed. By adjusting the size and distribution of different layers of phase change balls 4, it can be optimized for specific application requirements. Using phase change ball mounting holes of different sizes can also help achieve better heat conduction and heat distribution. Phase change balls 4 of different sizes can form different contact points and contact areas, thereby optimizing the transfer and distribution of heat in the stacking bed.

[0030] A vertical lifting device 8 is provided on the phase change stacking bed mounting bracket 5, and is used to drive the phase change ball stacking bed 6 to rise and fall. Preferably, the position of the phase change ball stacking bed 6 can be freely adjusted through a control console. Preferably, a vertical lifting device 8 is provided on the phase change stacking bed mounting bracket 5 below each layer of the phase change ball stacking bed 6. This design allows the phase change ball stacking bed 6 to adjust its height according to actual needs to adapt to different application scenarios. Through the control console, the operator can conveniently control the vertical lifting device 8 to achieve precise adjustment of the position of the phase change ball stacking bed 6.

[0031] A more optimized design is that an independent vertical lifting device 8 is provided under each layer of the phase change ball stacking bed 6. This means that each layer of the stacking bed can be independently raised and lowered without affecting other layers. Such a design further improves the flexibility and adaptability of the system. According to different needs, the distance between the layers can be adjusted, or each layer can be independently controlled to perform specific operations, such as adding phase change balls, maintenance inspection, etc.

[0032] In general, the application of the vertical lifting device 8 enables the phase change ball stacking bed 6 to have the characteristics of adjustable height and convenient operation. The independent vertical lifting device 8 of each layer further enhances the flexibility and independence of the system, making it more adaptable to different application scenarios and needs. Such a design will undoubtedly improve the overall performance and user experience of the system.

[0033] The flow equalizing plate 3 is arranged at the bottom end of the phase change stacked bed mounting bracket 5. The installation height of the flow equalizing plate 3 is preferably located above the manhole 2 described below.

[0034] In the present invention, diffuser holes are provided on the phase change ball packed bed 6 and the flow equalizer plate 3 to ensure uniform flow of the heat transfer fluid. The presence of diffuser holes helps to optimize the heat conduction process, thereby improving the heat conduction efficiency.

[0035] In the present invention, a temperature sensor is provided inside the phase change balls on each layer of the phase change ball stacked bed 6 to monitor the temperature inside the phase change balls 4 in real time. By measuring the temperature inside the phase change balls 4, the progress of the phase change process and the heat distribution state inside the stacked bed can be understood. This is crucial for controlling the phase change process, ensuring the stable operation of the system, and optimizing the heat exchange process. There are preferably 12 temperature sensors, and such a design can ensure sufficient data collection points to obtain more accurate and comprehensive temperature information. By monitoring these temperature data, the working state of the phase change ball stacked bed 6 can be understood in real time, and adjustments can be made as needed, such as adjusting the flow rate and temperature of the heat transfer fluid.

[0036] In the present invention, a manhole 2 is provided on the tank body, and a man-cargo integrated passage 13 is provided inside the tank body. Workers can enter the tank body through the manhole 2, and enter the phase change heat storage device through the man-cargo integrated passage 13, and can install or remove the phase change ball 4. The manhole 2 is preferably provided on the tank wall 7, and the man-cargo integrated passage 13 is preferably located in the center part.

[0037] This design allows staff to easily conduct internal inspections and operations. After entering the tank body, staff can further enter the interior of the phase change heat storage device through the integrated personnel and cargo passage 13. The integrated personnel and cargo passage 13 is located in the central part of the tank body, which is not only convenient for staff to pass through, but also can be used to transport and install equipment such as phase change balls. Inside the phase change heat storage device, staff can install and disassemble the phase change balls 4. According to actual needs, the number of phase change balls can be flexibly increased or decreased to adjust the heat storage capacity or perform maintenance and replacement. This design takes into account the safety of the staff and the convenience of operation. The location and size of the manhole 2 and the integrated personnel and cargo passage 13 are carefully planned to ensure that staff can easily enter and exit and complete their tasks. At the same time, the relevant areas may also be equipped with safety facilities such as guardrails, lighting and communication equipment to ensure the safety and work efficiency of the staff.

[0038] In the present invention, the integrated passenger and cargo passage 13 comprises: The bracket 133 provides support and connection points for the entire device, ensuring the stability and reliability of the channel to support the staff and the transported phase change ball 4.

[0039] The pedal 132 is disposed between the brackets 133 and is the main passage for the staff to walk. The surface of the pedal 132 is provided with anti-skid grooves to increase friction and prevent the staff from slipping or getting injured during walking.

[0040] The slide groove 134 is arranged on one side of the bracket, and the phase change ball can be transported through the slide groove 134. The phase change ball 4 can easily enter and exit the tank body and the phase change heat storage device through the slide groove 134, which simplifies the installation and disassembly process.

[0041] It may also include handrails 131, which are arranged at both ends of the bracket to provide support and help the staff maintain balance. The handrails 131 and the pedals 132 together form a safe and stable passage, allowing the staff to move easily and safely. The overall integrated passage 13 for people and goods is preferably made of aluminum alloy. Aluminum alloy has the characteristics of lightness, strength and corrosion resistance, and is suitable for such complex structures that need to bear a certain weight. In addition, aluminum alloy also has good processing properties and can be easily manufactured and assembled into the desired shape and structure.

[0042] In the present invention, the phase change ball 4 comprises: The phase change ball shell 44 is used to contain the phase change material 45. The phase change ball shell 44 is preferably made of PC plastic. The phase change material 45 is preferably a 58°C paraffin material.

[0043] The cover 41 has one end screwed to the inlet of the phase change material 45 on the phase change ball housing 44, and the other end screwed to the fixing device. The cover 41 can be screwed off to fill the phase change ball with paraffin material with a phase change temperature of 58°C.

[0044] In the present invention, a heat exchange device is provided in the phase change ball, which is preferably three aluminum metal fins 46 with an angle of 120° to enhance the heat storage and release capacity of the phase change ball.

[0045] In the present invention, the fixing device comprises: A fixing device base 42, which is screwed to the other end of the cover 41; The fixing rod 43 has one end rotatably connected to the fixing device base 42 via a rotating shaft 48, and the other end is a movable end, and the distance between the end points is controlled by the expansion and contraction of a spring to realize the conversion of the fixed state and the movable state of the phase change ball; The spring 47 has two ends connected to the fixing rod 43 respectively, and the middle part of the spring is a circular ring perpendicular to the spring spiral direction with a diameter slightly larger than the diameter of the cover.

[0046] When the spring 47 is not stressed, the phase change ball is in a fixed state. At this time, the distance between the movable ends of the fixed rod is greater than the diameter of the phase change ball installation hole. When force is applied to the fixed rod 43, the spring 47 contracts. At this time, the distance between the movable ends of the fixed rod is less than the diameter of the phase change ball installation hole. The phase change ball is in an active state, which is convenient for installation or removal. By adjusting the interaction between the fixed rod 43 and the spring 47, the phase change ball can be firmly fixed and flexibly removed. This design not only ensures the stability of the phase change ball inside the tank, but also facilitates the operation of the staff.

[0047] The fixing device is preferably made of stainless steel, and the spring 47 is preferably made of spring 47 steel and sprayed with anti-corrosion paint on the surface.

[0048] In the present invention, the vertical lifting device 8 is a worm gear 82, a worm 81, and a motor 83, and the worm gear 82, a worm 81, and a motor 83 are screwed to the phase change stacking bed mounting bracket 5. Specifically, it can be: The vertical lifting device 8 is composed of a worm 81 transmission device and a motor 83. The motor 83 drives the transmission shaft 85 to drive the worm 81 and the worm wheel 82 to achieve vertical lifting. The worm wheel 82 is installed with tapered roller bearings 84 above and below to bear radial loads.

[0049] The motor 83 is used as a power source to drive the worm 81 and the worm wheel 82 to rotate through the transmission shaft 85. The transmission of the worm wheel 82 and the worm 81 has a large transmission ratio, which can achieve a slow and stable speed control and is suitable for occasions where precise position adjustment is required.

[0050] Tapered roller bearings 84 are installed above and below the worm gear 82 to bear radial loads. This design ensures that during the vertical lifting process, the device can stably support the weight of the phase change ball stacking bed 6 and bear various forces and loads generated by the movement.

[0051] The worm gear transmission device is driven by the motor 83 to accurately control the vertical lifting position of the phase change ball stacking bed 6. This vertical lifting device 8 has the characteristics of compact structure, stable operation, high precision and strong load-bearing capacity, and is suitable for accurately adjusting and operating the phase change ball stacking bed 6 inside the tank or phase change heat storage device.

[0052] The transmission shaft 85 and the worm 81 are driven to rotate by the motor 83, and the helical line of the worm 81 is meshed with the tooth groove inside the worm wheel 82 to realize the rotation of the worm wheel 82, and the rotational motion of the worm wheel 82 is converted into linear motion by screwing with the phase change stacking bed mounting bracket 5, thereby realizing the lifting function. By controlling the motor 83, the lifting position of the phase change ball stacking bed 6 in the vertical direction can be accurately controlled. This vertical lifting device 8 has the characteristics of compact structure, stable operation, high precision and strong load-bearing capacity, and is suitable for precise adjustment and operation of the phase change ball stacking bed 6 inside the tank or phase change heat storage device.

[0053] The lifting principle is as follows: When the worm 81 rotates under the action of the driving device, its helix will mesh with the tooth grooves on the inner side of the worm wheel 82. Due to the design of the helix angle and tooth ratio of the worm 81 and the worm wheel 82, the worm wheel 82 will move axially driven by the worm 81. Through the action of the lifting mechanism, the rotational motion of the worm wheel 82 is converted into linear motion, thereby realizing the lifting function. The phase change ball stacking bed 6 is placed above the vertical lifting device. When the vertical lifting device rises, the phase change ball stacking bed 6 rises. When the vertical lifting device descends, due to the factor of gravity, the phase change ball stacking bed 6 descends. The two are in contact with each other but do not need to be fixed.

[0054] In summary, the vertical lifting device 8 using the worm gear 82, worm 81 and motor 83 provides stable and reliable vertical motion control for the phase change ball stacking bed 6, allowing the staff to easily install, disassemble and adjust the position of the phase change ball stacking bed 6.

[0055] The heat exchange principle of the present invention is as follows: When the water temperature is lower than 55°C, it is in the heat charging mode. The high-temperature heat flow enters the phase change heat storage tank from the lower part through the fluid inlet, flows through the phase change heat storage device to store heat, and flows out from the fluid outlet. When the temperature inside the phase change ball is higher than 60°C, the inlet is closed and the heat charging is completed. When it is in the heat release mode, the low-temperature fluid enters the tank from the fluid inlet for heat exchange. When the temperature inside the phase change ball is lower than 57°C, the heat release is completed.

[0056] The above are only preferred specific implementations of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and improved concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A phase change heat storage tank for transformation of idle oil field storage tanks, characterized in that: It comprises a tank body and a phase change heat storage device arranged in the tank body; The phase change heat storage device comprises: Phase change stacked bed mounting bracket; A plurality of layers of phase change ball stacking beds are arranged on the phase change stacking bed mounting bracket, and phase change ball mounting holes for mounting phase change balls are evenly distributed on the phase change ball stacking beds; A vertical lifting device, arranged on the phase change stacked bed mounting bracket, for driving the phase change ball stacked bed to rise and fall; The flow equalizing plate is arranged at the bottom end of the phase change stacked bed mounting bracket.

2. The phase change heat storage tank for transformation of idle oil field storage tanks according to claim 1 is characterized in that: The phase change ball stacking bed and the flow equalizing plate are provided with diffuse flow holes.

3. The phase change heat storage tank for transformation of idle oil field storage tanks according to claim 1 is characterized in that: A temperature sensor is arranged inside the phase change balls on each layer of the phase change ball accumulation bed.

4. The phase change heat storage tank for transformation of idle oil field storage tanks according to claim 1 is characterized in that: A manhole is arranged on the tank body, and a man-cargo integrated passage is arranged inside the tank body.

5. The phase change heat storage tank for transformation of idle oil field storage tanks according to claim 4 is characterized in that: The integrated passenger and cargo channel includes: Bracket; A pedal, disposed between the brackets; A slide groove is arranged on one side of the bracket.

6. The phase change heat storage tank for transformation of idle oil field storage tanks according to claim 1, characterized in that: The phase change ball comprises: The phase change ball shell is used to contain the phase change material; The sealing cover has one end screwed to the phase change material inlet on the phase change ball shell, and the other end screwed to the fixing device.

7. The phase change heat storage tank for transformation of idle oil field storage tanks according to claim 6, characterized in that: A heat exchange device is arranged in the phase change ball.

8. The phase change heat storage tank for transformation of idle oil field storage tanks according to claim 6, characterized in that: The fixing device comprises: a fixing device base, which is screwed to the other end of the cover; A spring, with two ends respectively connected to the fixing rods; The fixing rod has one end which is rotatably connected to the fixing device base through a rotating shaft, and the other end which is a movable end, and the distance between the end points is controlled by the expansion and contraction of the spring.

9. The phase change heat storage tank transformed from an idle oil field storage tank according to claim 1, characterized in that: The vertical lifting device is a worm gear motor, and the worm gear motor is screwed to the phase change stacking bed mounting bracket.

10. A phase change heat storage tank for transformation of idle oil field storage tanks according to any one of claims 1 to 9, characterized in that: The phase change stacked bed mounting brackets are provided in a plurality of groups, and each group of the phase change stacked bed mounting brackets is composed of three threaded rods.

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