Closed circulating deoxidizing device

Abstract

The invention discloses a closed circulating deoxygenization device. The closed circulating deoxygenization device comprises a shell, the first cavity is formed in the lower portion of the shell, the outer wall of the first cavity communicates with a high-pressure blow-down valve, and a heating assembly is arranged in the first cavity; the second cavity is formed in the middle of the shell, the outer wall of the second cavity is communicated with a water injection pipe, a conical confluence plate serves as a boundary between the second cavity and the first cavity, a water inlet pipe is arranged at the conical bottom of the conical confluence plate, and an exhaust sleeve is arranged in the axial direction of the conical confluence plate; the third cavity is formed in the upper portion of the shell, the top side wall of the third cavity is communicated with an exhaust pipe, and the third cavity and the second cavity are divided by a first partition plate. According to the closed circulation deoxygenization device, water to be deoxygenized is injected into the second cavity through the water injection pipe, the water to be deoxygenized flows back through the conical confluence plate and then enters the first cavity through the water inlet pipe to be heated, and water vapor generated in the heating process enters the third cavity through the exhaust sleeve and the first partition plate to be subjected to condensation backflow; therefore, circulating deoxygenation is realized.

Description

Technical Field

[0001] This invention relates to a closed-loop deaerator, belonging to the technical field of boiler system equipment. Background Technology

[0002] Dissolved oxygen in water can cause oxygen corrosion in equipment and pipelines within heat exchange networks. This not only affects the normal operation of equipment, shortens its service life, and increases maintenance costs, but can also lead to safety hazards and seriously hinder energy-saving technology improvements across various industries. Therefore, deoxygenation of industrial water is crucial. In boiler systems, oxygen corrosion can thin boiler tube walls, reduce their strength, and even cause pipeline explosions.

[0003] Existing deoxygenation devices use pipelines for external circulation to achieve deoxygenation. However, high-temperature water accelerates the oxidation rate of oxygen in the circulation pipelines, resulting in frequent maintenance of the circulation pipelines and low efficiency.

[0004] Furthermore, external circulation deoxygenation devices typically require additional equipment such as circulation pumps, pipelines, and heat exchangers to achieve water circulation and deoxygenation. This complicates the overall structure of the deoxygenation system, increases equipment investment and installation costs, and also occupies more space.

[0005] To drive water circulation within the system, the circulation pump consumes energy. Furthermore, the heating and deaeration process requires additional heat to maintain the water temperature, further increasing energy consumption. This energy consumption issue can be particularly pronounced in large-scale deaeration systems, leading to higher operating costs. Therefore, in order to solve the above-mentioned technical problems, a closed-loop deoxygenation device is urgently needed. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a closed-loop deoxygenation device that can effectively solve the problem of easy oxidation of pipelines in external circulation deoxygenation devices.

[0007] To achieve the above objectives / to solve the above technical problems, the present invention is implemented using the following technical solution: A closed-loop deaeration device, comprising: case; A first cavity is located at the lower part of the shell, and a first drain pipe is connected to the outer wall. A heating component is installed inside the first cavity. The second cavity is located in the middle of the shell and has a water injection pipe connected to its outer wall. The second cavity and the first cavity are separated by a conical manifold. A water inlet pipe is provided at the conical bottom of the conical manifold, and an exhaust sleeve is provided axially on the conical manifold. The third cavity is located on the upper part of the shell, and an exhaust pipe is connected to the top side wall. The third cavity and the second cavity are separated by the first partition. The exhaust sleeve and the first partition are both composed of porous media, serving as a gas-liquid separation interface for gas molecules to pass through. The water vapor generated during the heating process enters the third cavity through the exhaust sleeve and the first partition for condensation and reflux.

[0008] Furthermore, a cooling plate is provided in the third cavity, and the third cavity is connected to the first cavity through a return pipe. The condensate formed by the cooling plate flows back to the first cavity through the return pipe.

[0009] Furthermore, the first cavity includes a steam separation chamber, a heating chamber, and a water collection chamber arranged sequentially from top to bottom, wherein... The heating chamber, the steam separation chamber, and the water accumulation chamber are separated by a second partition. The heating component is disposed inside the heating chamber, and the water accumulation chamber is connected to the return pipe; The high-pressure drain valve is connected to the bottom side wall of the steam separation chamber, and the bottom side wall of the water accumulation chamber is connected to the first drain pipe. The steam separation chamber and the heating chamber are connected, while the water accumulation chamber and the heating chamber are not connected.

[0010] Furthermore, a plurality of return pipes are provided, and an array of such return pipes is distributed on the bottom side of the first partition plate; The return pipe extends through the conical manifold and the second partition into the water accumulation chamber. An exhaust gap is provided between the return pipe and the conical manifold, and the exhaust sleeve is installed in the exhaust gap.

[0011] Furthermore, it also includes a return hopper, which is used to connect the first baffle and the return pipe; The first partition plate has a through hole for condensate to pass through, one end of the return bucket is connected to the through hole, and the other end of the return bucket is interference-fitted with the return pipe.

[0012] Furthermore, it also includes support sleeves and heat insulation rings; The support sleeve is installed between the second partitions to allow the return pipe to pass through; The heat insulation ring is installed between the return pipe and the support sleeve.

[0013] Furthermore, the heating assembly includes: Several annular heating coils are provided and arranged between the second partitions; A connecting pipe is installed on the side wall of the heating chamber. Several heat exchange tubes are arranged inside the connecting pipe through an array of sealing plugs. The heat exchange tubes are connected to the heating coil.

[0014] Furthermore, it also includes: The first limiting support ring is fixed to the side wall of the heating chamber, and the second partition is installed on the first limiting support ring; The second limiting support ring is fixed to the side wall of the steam separation chamber, and the conical manifold is installed on the second limiting support ring.

[0015] Furthermore, it also includes support ribs, and multiple support ribs are provided, with the multiple support ribs connecting the cooling fins to the inner top wall of the third cavity.

[0016] Furthermore, it also includes a spiral guide plate, which is disposed inside the water inlet pipe.

[0017] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The closed-loop deoxygenation device provided by the present invention injects the water to be deoxygenated into the second chamber through the water injection pipe. After the deoxygenated water flows back through the conical manifold, it enters the first chamber through the water inlet pipe for heating. The water vapor generated during the heating process enters the third chamber through the exhaust sleeve and the first baffle for condensation and reflux, thereby achieving deoxygenation.

[0018] The closed-loop deoxygenation device provided by the present invention connects a circulation pump between the water collection chamber and the heating chamber through a pipeline. The circulation pump sends the condensate from the water collection chamber into the heating chamber for circulation deoxygenation, which effectively improves the overall deoxygenation effect. A check valve is also installed on the pipeline connecting the circulation pump and the heating chamber to ensure the stability of the overall operation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the closed-loop deoxygenation device provided by the present invention; Figure 2 This is a schematic diagram of the closed-loop deoxygenation device provided by the present invention in another state.

[0020] In the diagram: 1. Shell; 2. Water collection chamber; 3. Heating chamber; 4. Steam separation chamber; 5. Second chamber; 6. Third chamber; 7. First drain pipe; 8. High-pressure drain valve; 9. Top cover; 10. Water injection pipe; 11. Exhaust pipe; 12. First limiting support ring; 13. Second partition; 14. Connecting pipe; 15. Heating coil; 16. Support sleeve; 17. Conical manifold; 18. Return pipe; 19. Exhaust sleeve; 20. Water inlet pipe; 21. First partition; 22. Return hopper; 23. Cooling fins; 24. Support ribs; 25. Spiral guide plate; 26. Circulation pump. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0022] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances. Example 1

[0024] like Figure 1 As shown, this embodiment provides a closed-loop deoxygenation device, including: Casing 1; The first cavity is located at the lower part of the shell 1, and the outer wall is connected to the first drain pipe 7. A heating component is installed inside the first cavity. The second cavity 5 is located in the middle of the shell 1, and the outer wall is connected to the water injection pipe 10. The second cavity 5 and the first cavity are separated by a conical manifold 17. The conical bottom of the conical manifold 17 is provided with a water inlet pipe 20, and the conical manifold 17 is provided with an exhaust sleeve 19 in the axial direction. The third cavity 6 is located on the upper part of the shell 1, and the top side wall is connected to the exhaust pipe 11. The third cavity 6 and the second cavity 5 are separated by the first partition 21. The exhaust sleeve 19 and the first partition 21 are both composed of porous media, serving as a gas-liquid separation interface for gas molecules to pass through. The water vapor generated during the heating process enters the third cavity 6 through the exhaust sleeve 19 and the first partition 21 for condensation and reflux.

[0025] In the above technical solution, the closed-loop deoxygenation device provided in this embodiment can inject the water to be deoxygenated into the second chamber 5 through the water injection pipe 10. After the water to be deoxygenated flows back through the conical manifold 17, it enters the first chamber through the water inlet pipe 20 for heating. The water vapor generated during the heating process enters the third chamber 6 through the exhaust sleeve 19 and the first partition 21 for condensation and reflux, thereby achieving deoxygenation. Example 2

[0026] like Figure 1 As shown, the closed-loop deoxygenation device provided in this embodiment differs from the closed-loop deoxygenation device provided in Embodiment 1 in that: The third cavity 6 is provided with a cooling plate 23. The third cavity 6 is connected to the first cavity through a return pipe 18. The condensate formed by the cooling plate 23 flows back to the first cavity through the return pipe 18.

[0027] The first cavity includes, from top to bottom, a steam separation chamber 4, a heating chamber 3, and a water accumulation chamber 2, wherein, The heating chamber 3, the steam separation chamber 4, and the water accumulation chamber 2 are separated by a second partition 13. The heating component is disposed in the heating chamber 3, and the water accumulation chamber 2 is connected to the return pipe 18; The high-pressure drain valve 8 is connected to the bottom side wall of the steam separation chamber 4, and the bottom side wall of the water accumulation chamber 2 is connected to the first drain pipe 7. The steam separation chamber 4 and the heating chamber 3 are connected, while the water accumulation chamber 2 and the heating chamber 3 are not connected.

[0028] A plurality of return pipes 18 are provided, and the plurality of return pipes 18 are arrayed and distributed on the bottom side of the first partition plate 21; The return pipe 18 extends through the conical manifold 17 and the second partition 13 into the water accumulation chamber 2. An exhaust gap is provided between the return pipe 18 and the conical manifold 17, and the exhaust sleeve 19 is installed in the exhaust gap.

[0029] It also includes a return hopper 22, which is used to connect the first partition 21 and the return pipe 18; The first partition 21 has a through hole for condensate to pass through, one end of the return bucket 22 is connected to the through hole, and the other end of the return bucket 22 is interference-fitted with the return pipe 18.

[0030] It also includes the support sleeve 16 and the heat insulation ring; The support sleeve 16 is installed between the second partitions 13 to allow the return pipe 18 to pass through; The heat insulation ring is installed between the return pipe 18 and the support sleeve 16. The connection between the return pipe 18 and the second partition 13 below the heating chamber 3 is sealed to ensure that the heating chamber 3 and the water accumulation chamber 2 are not connected, but this does not affect the return pipe 18 from returning the condensate to the water accumulation chamber 2.

[0031] The heating component includes: Several annular heating coils 15 are provided and arranged between the second partitions 13; The connecting pipe 14 is located on the side wall of the heating chamber 3. Several heat exchange tubes are arranged inside the connecting pipe 14 through an array of sealing plugs. The heat exchange tubes are connected to the heating coil 15. In addition to ensuring the basic heating function, the heating component should also be equipped with a temperature sensor and a temperature control component to monitor the heating temperature for dynamic adjustment. This is a conventional choice in the field and will not be elaborated here.

[0032] It also includes a first limiting support ring 12, which is fixed to the side wall of the heating chamber 3, and the second partition 13 is installed on the first limiting support ring 12; The second limiting support ring is fixed to the side wall of the steam separation chamber 4, and the conical manifold 17 is installed on the second limiting support ring.

[0033] It also includes support ribs 24, of which multiple support ribs 24 are provided, and multiple support ribs 24 connect the cooling plate 23 to the inner top wall of the third cavity 6.

[0034] It also includes a spiral guide plate 25, which is disposed inside the water inlet pipe 20.

[0035] The following will combine Figure 1 The closed-loop deoxygenation device provided in this embodiment will be described as follows: Figure 1 As shown, the closed-loop deaerator includes a shell 1, and the shell 1 is provided with a water collection chamber 2, a heating chamber 3, a steam separation chamber 4, a second chamber 5 and a third chamber 6 from bottom to top. Among them, a first drain pipe 7 is provided at the bottom of the water accumulation cavity 2; A second partition 13 is provided on each of the two axial sides of the heating chamber 3. A heating mechanism is provided between the second partition 13. The second partition 13 between the steam separation chamber 4 and the heating chamber 3 is provided with an array of first through holes. The top of the heating chamber 3 is connected to the bottom of the steam separation chamber 4. The second partition 13 between the water accumulation chamber 2 and the heating chamber 3 is used to isolate the water accumulation chamber 2 and the heating chamber 3. The water accumulation chamber 2 and the heating chamber 3 are not connected. A conical manifold 17 with a conical structure is provided between the steam separation chamber 4 and the second chamber 5. A water inlet pipe 20 is provided at the conical bottom of the conical manifold 17. The water inlet pipe 20 passes through the second partition 13 and extends into the heating chamber 3. A high-pressure drain valve 8 is provided on the bottom side wall of the steam separation chamber 4, and a water injection pipe 10 is provided on the top side wall of the second chamber 5. The main water pipe 10 should also be equipped with a main isolation valve and a check valve. The main isolation valve is a gate valve or a ball valve. During normal system operation, the main isolation valve is closed and is only opened when water needs to be replenished. The check valve is installed after the main isolation valve to prevent the medium in the system from flowing back into the water supply pipeline when the pressure is abnormal, thus protecting the safety of the external water source and equipment.

[0036] A first partition 21 is provided between the second cavity 5 and the third cavity 6. The first partition 21 is densely covered with a number of second through holes, the diameter of which is less than 2 mm. An exhaust pipe 11 is provided at the top of the third cavity 6. Among them, a number of return pipes 18 are fixed in an array on the first partition 21. The return pipes 18 extend through the conical manifold 17 and the second partition 13 into the water accumulation chamber 2. An exhaust gap is provided between the return pipes 18 and the conical manifold 17. An exhaust sleeve 19 with a porous structure made of sintered metal is provided in the exhaust gap. Water enters the heating chamber 3 from the second chamber 5 through the water inlet pipe 20 for circulation heating and deoxygenation. Subsequently, due to the large mesh density of the exhaust sleeve 19, water is difficult to discharge from the exhaust sleeve 19 into the second chamber 5, but the separated oxygen can enter the second chamber 5 through the exhaust sleeve 19 and finally be discharged from the top third chamber 6. The set return pipe 18 and the high-density first partition 21 can make water vapor condense and fall back into the water accumulation chamber 2, and the mechanism realizes internal circulation. The condensed return water can be discharged through the first drain pipe 7 for production. The high-pressure drain valve 8 can be opened periodically for sewage discharge.

[0037] A normally closed valve body should be installed on the first drain pipe 7 to control the opening and closing of the first drain pipe 7 and realize controllable drainage. The normally closed valve body can be a gate valve or a ball valve. During normal operation of the system, this valve must always be kept closed and only temporarily opened when drainage or venting is required.

[0038] The housing 1 includes a bottom housing, a top housing, and a top cover plate 9. A first limiting support ring 12 is provided inside the bottom housing, and a second partition plate 13 is stacked and installed in the first limiting support ring 12. A second limiting support ring is provided in the middle of the top housing, and a conical manifold 17 is installed on the second limiting support ring. The split structure facilitates the installation of the second partition 13 and the conical manifold 17. Compared with welding fixation, the limiting support is easier to maintain.

[0039] The bottom shell, top shell, and top cover plate 9 are fixed together by flanges, which provide high stability.

[0040] Several integrated bent return buckets 22 are arranged in an array on the first partition plate 21. The return pipe 18 is fixed to the bottom of the return bucket 22 with an interference fit. The return bucket 22 can increase the recovery efficiency of condensate.

[0041] A cooling fin 23 is connected to the top of the third cavity 6 by several supporting ribs 24. The cooling fin 23 is thermally connected to the outside through the supporting ribs 24 and the top shell of the third cavity 6. The cooling fin 23 can increase the condensation efficiency of the condensate and reduce the water accumulation in the exhaust pipe 11.

[0042] A plurality of support sleeves 16 corresponding to the return pipe 18 are arranged in an array between the two sets of second partition plates 13, and a heat insulation ring is provided between the support sleeve 16 and the wall of the return pipe 18. The heat insulation ring ensures that the condensate can flow back stably into the water accumulation chamber 2, reducing the possibility of secondary heating of water vapor.

[0043] The heating mechanism includes several annular heating coils 15 arranged between the second partitions 13. A connecting pipe 14 is provided on the side wall of the heating chamber 3. Several heat exchange tubes are arranged in the connecting pipe 14 through an array of sealing plugs. The heat exchange tubes are interconnected with the heating coils 15. The coils have a large heating area and high heat exchange efficiency.

[0044] A spiral guide plate 25 with a spiral structure is provided inside the water inlet pipe 20; the spiral guide plate 25 can prevent the water in the heating chamber 3 from backflowing or flowing back into the second chamber 5 due to heating and boiling.

[0045] like Figure 1 As shown, the inlet pipe 20 is located in the lower middle part of the heating chamber 3. This arrangement ensures that the outlet is never below the liquid surface, forming a liquid seal. The steam pressure in the heating chamber 3 acts directly on the liquid surface, requiring the steam to overcome the static pressure of this liquid column before entering the inlet pipe 20. This significantly increases the resistance to steam backflow and effectively prevents backflow. Cold water is injected into the relatively cooler lower liquid layer, gradually mixing and heating up. This avoids instantaneous boiling when cold water directly contacts the high-temperature wall or liquid surface, thus preventing pipe vibration and cavitation. Simultaneously, injecting liquid from the bottom helps create natural convection, with cold water at the bottom and hot water at the top, resulting in higher heating efficiency and a more uniform temperature field.

[0046] To improve the overall deoxygenation effect, such as Figure 2As shown, a circulation pump 26 is also provided. The circulation pump 26 is connected to the water collection chamber 2 and the heating chamber 3 through a pipeline to send the condensate in the water collection chamber 2 into the heating chamber 3 for circulation and deoxygenation. A check valve should also be provided on the pipeline connecting the circulation pump 26 and the heating chamber 3 to ensure the stability of the overall operation.

[0047] Device installation: The device housing 1 is installed in two parts. The bottom housing is placed in a predetermined position, and a first limiting support ring 12 is installed inside the bottom housing. Then, the second partition plates 13 are stacked and installed in the first limiting support ring 12. Next, the heating coil 15 of the heating mechanism is arranged in a ring between the two sets of second partition plates 13, and the heat exchange tube is connected to the heating coil 15. The heat exchange tube is fixed by the sealing plug on the connecting pipe 14.

[0048] Install the top housing, and set a second limiting support ring in the middle of the top housing. Install the conical manifold 17 on the second limiting support ring. Then, fix the top cover 9 to the top housing through a flange to ensure the sealing and stability of the entire housing 1.

[0049] A reflux hopper 22 with an integral bending structure is provided on the first partition 21. The reflux pipe 18 is interference-fitted and fixed to the bottom of the reflux hopper 22, and the reflux pipe 18 is arrayed and fixed on the first partition 21. At the same time, the cooling fin 23 is connected to the top of the third cavity 6 by a support rib 24 to ensure the thermal conductivity connection between the cooling fin 23 and the outside.

[0050] A support sleeve 16 corresponding to the return pipe 18 is installed between the two sets of second partitions 13, and a heat insulation ring is set between the support sleeve 16 and the wall of the return pipe 18. A spiral guide plate 25 with a spiral structure is installed inside the water inlet pipe 20 to complete the installation of the internal structure of the device.

[0051] Device operation: Production water enters the second chamber 5 through the water injection pipe 10 on the top side wall of the second chamber 5. Then, the water flows steadily into the heating chamber 3 through the water inlet pipe 20 at the bottom of the conical manifold 17 and under the action of the spiral guide plate 25.

[0052] The heating mechanism starts working, and the heating coil 15 heats the water. The water is heated in the heating chamber 3, and the dissolved oxygen in the water gradually precipitates out. Because the exhaust sleeve 19 is made of a porous structure of sintered metal material with a large mesh density, it is difficult for water to enter the second chamber 5 through the exhaust sleeve 19, but the separated oxygen can enter the second chamber 5 through the exhaust sleeve 19 and finally be discharged from the exhaust pipe 11 at the top of the third chamber 6.

[0053] During the heating process, the generated water vapor rises to the third chamber 6 through the second through hole. The cooling plate 23 exchanges heat with the outside environment, reducing the temperature inside the third chamber 6 and causing the water vapor to condense into water droplets. The reflux hopper 22 and reflux pipe 18 increase the efficiency of condensate recovery. The condensate flows back to the water collection chamber 2 through the reflux pipe 18, realizing the internal circulation of the device.

[0054] After multiple cycles of deoxygenation, the water quality meets production requirements. At this point, the first drain pipe 7 at the bottom of the water collection chamber 2 is opened to discharge the condensate return water for chemical production. The high-pressure drain valve 8 on the bottom side wall of the steam separation chamber 4 is opened periodically for sewage discharge.

[0055] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A closed-loop deoxygenation device, characterized in that, include: Shell (1); The first cavity is located at the lower part of the shell (1), and the outer wall is connected to the first drain pipe (7). A heating component is installed inside the first cavity. The second cavity (5) is located in the middle of the shell (1), and the outer wall is connected to the water injection pipe (10). The second cavity (5) and the first cavity are separated by a conical manifold (17). The conical bottom of the conical manifold (17) is provided with a water inlet pipe (20), and the axial direction of the conical manifold (17) is provided with an exhaust sleeve (19). The third cavity (6) is located on the upper part of the shell (1) and is used for condensation reflux. The top side wall is connected to an exhaust pipe (11). The third cavity (6) and the second cavity (5) are separated by a first partition (21). The exhaust sleeve (19) and the first partition (21) are both composed of porous media, which serve as a gas-liquid separation interface for gas molecules to pass through. The water vapor generated during the heating process enters the third cavity (6) through the exhaust sleeve (19) and the first partition (21) for condensation and reflux.

2. The closed-loop deoxygenation device according to claim 1, characterized in that, The third cavity (6) is provided with a cooling plate (23). The third cavity (6) is connected to the first cavity through a return pipe (18). The condensate formed by the cooling plate (23) flows back to the first cavity through the return pipe (18).

3. The closed-loop deoxygenation device according to claim 2, characterized in that, The first cavity includes a steam separation chamber (4), a heating chamber (3), and a water collection chamber (2) arranged sequentially from top to bottom, wherein, The heating chamber (3), the steam separation chamber (4), and the water accumulation chamber (2) are separated by a second partition (13); The heating component is disposed in the heating chamber (3), and the water accumulation chamber (2) is connected to the return pipe (18); The high-pressure drain valve (8) is connected to the bottom side wall of the steam separation chamber (4), and the bottom side wall of the water accumulation chamber (2) is connected to the first drain pipe (7). The steam separation chamber (4) and the heating chamber (3) are connected, while the water accumulation chamber (2) and the heating chamber (3) are not connected.

4. The closed-loop deoxygenation device according to claim 3, characterized in that, The return pipe (18) is provided in a plurality of arrays, which are distributed on the bottom side of the first partition (21); The return pipe (18) extends through the conical manifold (17) and the second partition (13) into the water accumulation chamber (2). An exhaust gap is provided between the return pipe (18) and the conical manifold (17), and the exhaust sleeve (19) is installed in the exhaust gap.

5. The closed-loop deoxygenation device according to claim 4, characterized in that, It also includes a return hopper (22), which is used to connect the first partition (21) and the return pipe (18); The first partition (21) has a through hole for condensate to pass through. One end of the return bucket (22) is connected to the through hole, and the other end of the return bucket (22) is interference-fitted with the return pipe (18).

6. The closed-loop deoxygenation device according to claim 5, characterized in that, It also includes a support sleeve (16) and a heat insulation ring; The support sleeve (16) is installed between the second partitions (13) for the passage of the return pipe (18); The heat insulation ring is installed between the return pipe (18) and the support sleeve (16).

7. The closed-loop deoxygenation device according to claim 6, characterized in that, The heating component includes: Several annular heating coils (15) are provided and arranged between the second partitions (13); A connecting pipe (14) is set on the side wall of the heating chamber (3). Several heat exchange tubes are arranged in the connecting pipe (14) through a sealing plug array. The heat exchange tubes are connected to the heating coil (15).

8. The closed-loop deoxygenation device according to claim 7, characterized in that, Also includes: The first limiting support ring (12) is fixed to the side wall of the heating chamber (3), and the second partition (13) is installed on the first limiting support ring (12); The second limiting support ring is fixed to the side wall of the steam separation chamber (4), and the conical manifold (17) is installed on the second limiting support ring.

9. The closed-loop deoxygenation device according to claim 8, characterized in that, It also includes support ribs (24), and multiple support ribs (24) are provided. The multiple support ribs (24) connect the cooling plate (23) and the inner top wall of the third cavity (6).

10. The closed-loop deoxygenation device according to claim 1, characterized in that, It also includes a spiral guide plate (25), which is disposed inside the water inlet pipe (20).

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