A high-pressure steam generator for oilfield electrothermal molten salt energy storage

Abstract

This utility model relates to the technical field of electrothermal molten salt energy storage steam generation devices, and more particularly to an oilfield electrothermal molten salt energy storage high-pressure steam generation device. This device includes a hollow cylindrical heat exchange cylinder with elliptical end caps welded to both ends. The heat exchange tube bundle inside the cylinder is fixed by axially staggered flow-stabilizing guide plates, stabilizing the flow of hot molten salt and guiding its uniform distribution, thereby enhancing the contact efficiency between the heat exchange tube bundle and the molten salt. A high-temperature molten salt inlet pipe and a low-temperature molten salt outlet pipe are connected to the heat exchange cylinder to form a molten salt circulation channel, allowing the heat from the high-temperature molten salt to be transferred to the feedwater circuit through heat exchange with the tube bundle. The heat exchange tube bundle indirectly heats the softened water into high-pressure steam through indirect heat exchange with the high-temperature molten salt inside the cylinder. This device integrates molten salt energy storage and steam generation functions. Through a robust sealing structure, optimized flow channel design, and efficient heat exchange mechanism, it achieves molten salt heat transfer and steam generation under high-pressure conditions, significantly improving heat exchange efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of electrothermal molten salt energy storage steam generators, and in particular to an oilfield electrothermal molten salt energy storage high-pressure steam generator. Background Technology

[0002] In the field of oilfield electrothermal molten salt energy storage steam generation technology, ensuring uniform heating of heat exchange tube bundles and effectively reducing the flow resistance of heat exchange sources are key factors in improving the stable operation of the equipment. Technological advancements in this field are of great significance for improving energy utilization efficiency, reducing equipment maintenance costs, and extending equipment service life.

[0003] Traditional shell-and-tube heat exchangers typically use baffles to extend the heat exchange path of the heat source to achieve the desired heat exchange effect. However, this design has some significant drawbacks. Specifically, the baffles are welded to the shell at a 90° angle, which not only significantly increases the flow resistance of the fluid, leading to an increase in system pressure drop, but also produces a series of negative effects when the fluid passes through.

[0004] For example, when a heat exchanger impacts a baffle plate perpendicularly, local eddies easily form around the impact point. These eddies not only increase energy loss but also hinder smooth fluid flow, further weakening the heat exchange effect. Furthermore, this design exacerbates equipment wear and fatigue, thus affecting the stability and reliability of the entire system. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] This invention provides an oilfield electrothermal molten salt energy storage high-pressure steam generator to overcome the problems of high flow resistance, increased pressure drop, and low heat exchange efficiency caused by local eddies in existing steam generators due to the vertical impact of the heat source on the baffle plate.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides an oilfield electrothermal molten salt energy storage high-pressure steam generator, comprising: a heat exchange cylinder;

[0009] The heat exchange cylinder is a hollow cylindrical structure, and elliptical end caps are provided at both the left and right ends of the heat exchange cylinder, which are welded to the heat exchange cylinder.

[0010] The heat exchange cylinder is provided with a heat exchange tube bundle, which is fixed by a number of flow-stabilizing guide plates;

[0011] The plurality of flow-stabilizing guide plates are arranged in a staggered manner relative to each other along the inner wall of the heat exchange cylinder, and the plurality of flow-stabilizing guide plates are respectively fixedly connected to the inner wall of the heat exchange cylinder.

[0012] The lower end of the heat exchange cylinder is provided with a high-temperature molten salt input pipe and a low-temperature molten salt output pipe, and the high-temperature molten salt input pipe, the low-temperature molten salt output pipe and the heat exchange tube bundle are fixedly connected.

[0013] The heat exchange tube bundle is provided with a softened water inlet and a steam outlet at both ends, respectively;

[0014] The flow stabilizing guide plate includes a support plate and two symmetrically arranged guide plates. The two guide plates are fixedly connected, and the included angle α formed between the two guide plates is in the range of 30°-60°. The guide plates enable the hot molten salt fluid to form an S-shaped flow channel in the heat exchange cylinder.

[0015] Preferably, the heat exchange tube bundle is composed of several stacked and bent heat exchange tubes, and the heat exchange tube bundle is located at the center of the heat exchange cylinder through several flow-stabilizing guide plates, and a gap is provided between the heat exchange tube bundle and the inner wall of the heat exchange cylinder.

[0016] Preferably, the support plate is located on the center line of the two guide plates, and the lower end of the support plate is fixedly connected to the two guide plates.

[0017] Preferably, the support plate is provided with a plurality of through holes, and a heat exchange tube bundle is embedded in the through holes. The heat exchange tube bundle passes through the support plate and is welded to the support plate.

[0018] Preferably, the flow-stabilizing guide plate is made of a high-temperature resistant alloy.

[0019] Preferably, the heat exchange tube bundle exchanges heat indirectly with the external high-temperature molten salt, and a steam generation channel is formed through the softened water inlet and the steam outlet.

[0020] Preferably, the guide plate has a semi-circular arc structure with the arc surface facing outwards.

[0021] (III) Beneficial Effects

[0022] This utility model provides an oilfield electrothermal molten salt energy storage high-pressure steam generator, which can realize the formation of a stable and sealed cavity by welding the heat exchange cylinder to the elliptical end caps at both ends, adapting to high-pressure working conditions and ensuring structural strength.

[0023] The heat exchange tube bundle installed in the heat exchange cylinder is fixed by several flow stabilizing guide plates. The flow stabilizing guide plates are arranged in a staggered manner along the inner wall axis, which can stabilize the flow of hot molten salt fluid and guide its uniform distribution, thereby enhancing the contact efficiency between the heat exchange tube bundle and the hot molten salt.

[0024] The high-temperature molten salt inlet pipe at the lower end is fixedly connected to the low-temperature molten salt outlet pipe and the heat exchange tube bundle to form a circulation channel for the hot molten salt, which facilitates the transfer of heat from the high-temperature molten salt to the softened water flowing inside the heat exchange tube bundle.

[0025] The heat exchange tube bundle has a softened water inlet at one end and a steam outlet at the other end. By indirectly exchanging heat with the high-temperature molten salt inside the heat exchange cylinder, the softened water can be efficiently heated and converted into high-pressure steam. This achieves the integration of molten salt energy storage and steam generation, thereby improving heat exchange efficiency. Attached Figure Description

[0026] Figure 1 This invention presents a schematic diagram of the structure of an oilfield electrothermal molten salt energy storage high-pressure steam generator.

[0027] Wherein: 1: heat exchange cylinder; 2: softened water inlet; 3: heat exchange tube bundle; 3-1: high temperature molten salt input pipe; 3-2: low temperature molten salt output pipe; 4: elliptical head; 5: flow stabilizer guide plate; 5-1: support plate; 5-2: guide plate; 6: steam outlet. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0029] In the description of this utility model, it is necessary to understand that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "top", and "bottom" are all based on the orientation or positional relationship shown in the accompanying drawings. The purpose is only to facilitate the description of this utility model and simplify the description, and is not intended to indicate or imply that the indicated component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0030] like Figure 1 As shown, this utility model provides an oilfield electrothermal molten salt energy storage high-pressure steam generator, comprising: a heat exchange cylinder 1;

[0031] The heat exchange cylinder 1 adopts a hollow cylindrical structure. Elliptical end caps 4 are provided at the left and right ends of the heat exchange cylinder 1. The elliptical end caps 4 are tightly connected to the heat exchange cylinder 1 by welding to form a pressure-bearing cavity with good sealing performance and a stable structure, which provides a solid foundation for the safe and stable operation of the device, and at the same time provides a reliable space carrier for the installation and operation of the internal components.

[0032] The heat exchange cylinder 1 is equipped with a heat exchange tube bundle 3 inside. The heat exchange tube bundle 3 is fixed to the center of the heat exchange cylinder 1 by a number of flow stabilizing guide plates 5. The number of flow stabilizing guide plates 5 are arranged in a staggered manner along the inner wall of the heat exchange cylinder 1. The number of flow stabilizing guide plates 5 are respectively fixedly connected to the inner wall of the heat exchange cylinder 1.

[0033] The heat exchange tube bundle 3 is composed of several stacked and bent heat exchange tubes. This arrangement increases the heat exchange area, making the contact between the high-temperature molten salt and the heat exchange tube bundle 3 more sufficient and conducive to efficient heat transfer. The heat exchange tube bundle 3 is located at the center of the heat exchange cylinder 1 through several flow-stabilizing guide plates 5. There is a gap between the heat exchange tube bundle 3 and the inner wall of the heat exchange cylinder 1, which provides a smooth flow channel for the hot molten salt fluid and avoids the problem of fluid stagnation and poor flow in a narrow space.

[0034] The flow-stabilizing guide plate 5 includes a support plate 5-1 and two guide plates 5-2. The two guide plates 5-2 are semi-circular arc structures with the arc surface facing outwards, forming a specific included angle α between them. The angle α ranges from 30° to 60°. Fluid experiments have shown that the angle α should preferably be 45°. This unique structure can guide the hot molten salt fluid to form an S-shaped flow channel in the heat exchange cylinder 1. When the hot molten salt fluid flows through the flow-stabilizing guide plate 5, the semi-circular arc guide plate 5-2 will tangentially guide the flow, avoiding the fluid from vertically impacting the plate and generating local eddies. This effectively reduces the flow resistance of the fluid, allowing the hot molten salt to flow through the heat exchange tube bundle 3 in a uniform and stable state, greatly improving the uniformity of fluid distribution and thus enhancing the heat exchange effect.

[0035] The support plate 5-1 is located on the center line of the two guide plates 5-2, and its lower end is fixedly connected to the guide plate 5-2. The heat exchange tube bundle 3 is embedded in the evenly distributed through holes on the support plate 5-1. The heat exchange tube bundle 3 passes through the through holes and is welded to the support plate 5-1. This connection method not only firmly fixes the heat exchange tube bundle 3, ensuring that it will not be displaced or vibrated during fluid flow, but also ensures a tight fit between the heat exchange tube bundle 3 and the flow stabilizing guide plate 5, further improving the structural strength and stability of the entire device. The flow stabilizing guide plate 5 is made of high-temperature resistant alloy, specifically Inconel 625 nickel-based high-temperature alloy. This material has excellent high-temperature resistance and oxidation resistance, and can work stably for a long time in a high-temperature molten salt environment, effectively resisting high-temperature oxidation and media corrosion, and greatly extending the service life of the device.

[0036] The lower end of the heat exchange cylinder 1 is provided with a high-temperature molten salt inlet pipe 3-1 and a low-temperature molten salt outlet pipe 3-2. The high-temperature molten salt inlet pipe 3-1, the low-temperature molten salt outlet pipe 3-2 and the heat exchange tube bundle 3 are fixedly connected to form the inlet and outlet channel of the high-temperature molten salt. The high-temperature molten salt enters the heat exchange cylinder 1 from the high-temperature molten salt inlet pipe 3-1. Under the guidance of the flow stabilizer guide plate 5, it fully exchanges heat with the heat exchange tube bundle 3 along the S-shaped channel. After releasing heat, it flows out from the low-temperature molten salt outlet pipe 3-2, realizing the efficient transfer of molten salt heat.

[0037] One end of the heat exchange tube bundle 3 is provided with a softened water inlet 2, and the other end is provided with a steam outlet 6. After the softened water enters the heat exchange tube bundle 3 from the softened water inlet 2, it indirectly exchanges heat with the external high-temperature molten salt, absorbs the heat released by the molten salt, gradually heats up and vaporizes into high-pressure steam, and finally exits from the steam outlet 6.

[0038] This indirect heat exchange method ensures that the softened water is heated in a safe environment, avoiding the pollution and corrosion problems that may be caused by direct contact with high-temperature molten salt, and also forms an efficient steam generation channel, ensuring the stability and efficiency of the steam generation process.

[0039] It is understood that the above-mentioned embodiments mentioned in this utility model can be combined with each other to form combined embodiments without violating the principle and logic. Due to space limitations, this utility model will not elaborate further.

[0040] Those skilled in the art will understand that, in the above-described method of the specific implementation, the order in which each step is written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of each step should be determined by its function and possible internal logic.

[0041] The oilfield electrothermal molten salt energy storage high-pressure steam generator provided by this utility model forms a stable and sealed cavity by means of heat exchange cylinder 1 and elliptical end caps 4 welded to both ends, which can adapt to high pressure conditions and ensure structural strength.

[0042] The heat exchange tube bundle 3 installed in the heat exchange cylinder 1 is fixed by several flow stabilizing guide plates 5. The flow stabilizing guide plates 5 are arranged in a staggered manner along the inner wall axis, which can stabilize the flow of hot molten salt fluid and guide its uniform distribution, thereby enhancing the contact efficiency between the heat exchange tube bundle 3 and the hot molten salt.

[0043] The high-temperature molten salt inlet pipe 3-1 at the lower end is fixedly connected to the low-temperature molten salt outlet pipe 3-2 and the heat exchange tube bundle 3 to form a circulation channel for hot molten salt, which facilitates the transfer of heat from the high-temperature molten salt to the softened water flowing inside the heat exchange tube bundle 3.

[0044] The heat exchange tube bundle 3 has a softened water inlet 2 at one end and a steam outlet 6 at the other end. By indirectly exchanging heat with the high-temperature molten salt inside the heat exchange cylinder 1, the softened water can be efficiently heated and converted into high-pressure steam, realizing the integration of molten salt energy storage and steam generation functions, thereby improving the heat exchange efficiency.

[0045] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical applications, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A high-pressure steam generator for oilfield electrothermal molten salt energy storage, characterized in that, include: Heat exchange cylinder (1); The heat exchange cylinder (1) is a hollow cylindrical structure. Elliptical heads (4) are provided at the left and right ends of the heat exchange cylinder (1). The elliptical heads (4) are welded to the heat exchange cylinder (1). The heat exchange cylinder (1) is provided with a heat exchange tube bundle (3), which is fixed by a number of flow-stabilizing guide plates (5); The plurality of flow-stabilizing guide plates (5) are arranged in a staggered manner along the inner wall of the heat exchange cylinder (1), and the plurality of flow-stabilizing guide plates (5) are respectively fixedly connected to the inner wall of the heat exchange cylinder (1). The lower end of the heat exchange cylinder (1) is provided with a high-temperature molten salt input pipe (3-1) and a low-temperature molten salt output pipe (3-2), and the high-temperature molten salt input pipe (3-1), the low-temperature molten salt output pipe (3-2) and the heat exchange tube bundle (3) are fixedly connected. The heat exchange tube bundle (3) is provided with a softened water inlet (2) and a steam outlet (6) at both ends. The flow guide plate (5) includes a support plate (5-1) and two symmetrically arranged guide plates (5-2). The two guide plates (5-2) are fixedly connected, and the included angle α formed between the two guide plates (5-2) is in the range of 30°-60°. The guide plates (5-2) enable the hot molten salt fluid to form an S-shaped flow channel in the heat exchange cylinder (1).

2. The oilfield electrothermal molten salt energy storage high-pressure steam generator according to claim 1, characterized in that, The heat exchange tube bundle (3) is composed of several stacked and bent heat exchange tubes. The heat exchange tube bundle (3) is located at the center of the heat exchange cylinder (1) through several flow-stabilizing guide plates (5). There is a gap between the heat exchange tube bundle (3) and the inner wall of the heat exchange cylinder (1).

3. The oilfield electrothermal molten salt energy storage high-pressure steam generator according to claim 1, characterized in that, The support plate (5-1) is located on the center line of the two guide plates (5-2), and the lower end of the support plate (5-1) is fixedly connected to the two guide plates (5-2).

4. The oilfield electrothermal molten salt energy storage high-pressure steam generator according to claim 1, characterized in that, The support plate (5-1) is provided with a plurality of through holes, and a heat exchange tube bundle (3) is embedded in the through holes. The heat exchange tube bundle (3) passes through the support plate (5-1) and is welded to the support plate (5-1).

5. The oilfield electrothermal molten salt energy storage high-pressure steam generator according to claim 1, characterized in that, The flow guide plate (5) is made of high-temperature resistant alloy.

6. The oilfield electrothermal molten salt energy storage high-pressure steam generator according to claim 1, characterized in that, The heat exchange tube bundle (3) indirectly exchanges heat with the external high-temperature molten salt, and forms a steam generation channel through the softened water inlet (2) and the steam outlet (6).

7. The oilfield electrothermal molten salt energy storage high-pressure steam generator according to claim 3, characterized in that, The guide plate (5-2) has a semi-circular arc structure with the arc surface facing outwards.

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