A swirl film tube, a swirl film apparatus, and a swirl film deaerator

Abstract

This invention provides a swirl film tube, a swirl film generator, and a swirl film deaerator. The swirl film tube includes an outer tube and an inner tube arranged coaxially. The inner tube has caps at both ends and a water inlet on its side. Multiple sets of jet nozzles are evenly distributed along the axial direction on the side wall of the inner tube. Each set of nozzles has multiple nozzles evenly distributed along the circumference of the inner tube. Each nozzle has an angle between itself and its corresponding radial direction in the horizontal plane and is inclined in the same direction. Each nozzle is also inclined downwards. A flow rotation assembly is provided inside the inner tube, connected to an airflow acceleration assembly located at the outer end of the inner tube. When water flows through the inner tube, the flow rotation assembly drives the airflow acceleration assembly to accelerate the steam flow through the outer tube. This invention improves the steam flow effect, enhances the heating effect of steam on the water film on the inner wall of the outer tube, and improves the heat exchange between steam and the water film skirt, thus accelerating the heating efficiency of the water.

Description

Technical Field

[0001] This invention relates to the field of swirl film deaerator technology, and more particularly to a swirl film tube, a swirl film device, and a swirl film deaerator. Background Technology

[0002] To prevent corrosion of thermal equipment and its pipelines, dissolved oxygen and other gases in boiler feedwater must be removed. This ensures the safe operation and extended service life of the thermal equipment. The rotary film deaerator utilizes the principle of thermal deaeration, namely Henry's Law and Dalton's Law, which states that for various gases dissolved in water, under a certain pressure, the higher the water temperature, the lower the solubility.

[0003] The deaerator head of a swirl film deaerator mainly consists of a swirl film device, a water grate, and packing. The swirl film device consists of a swirl film tube, a connecting pipe, and upper and lower tube sheets. In existing deaerators, the swirl film tube generates a water film skirt, which contacts the steam for heat transfer, thus achieving the heating effect. However, the free upward flow of steam has weak mobility, making it difficult to ensure sufficient hot steam for heat transfer with the water film skirt, which limits the heating efficiency. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a swirl film tube, a swirl film generator, and a swirl film deaerator to accelerate steam flow and improve the heat exchange effect between steam and water film.

[0005] According to an embodiment of the present invention, a swirl tube includes an outer tube and an inner tube arranged coaxially. The inner tube has caps at both ends and a water inlet on its side. The side wall of the inner tube is provided with multiple sets of jet nozzles evenly distributed along its axial direction. Each set of jet nozzles has multiple nozzles and is evenly distributed along the circumference of the inner tube. Each jet nozzle has an angle between itself and its corresponding radial direction in the horizontal plane and is inclined in the same direction. Each jet nozzle is also inclined downward. A flow rotation assembly is provided inside the inner tube. The flow rotation assembly is connected to an airflow acceleration assembly located at the outer end of the inner tube. When water flows through the inner tube, the flow rotation assembly can drive the airflow acceleration assembly to accelerate the steam through the outer tube.

[0006] Preferably, the airflow acceleration component includes a plurality of fan blades connected to and driven to rotate by the flow rotation component.

[0007] More preferably, the flow rotation assembly includes a rotating shaft coaxially rotatably disposed inside the inner tube and an impeller fixedly connected to the rotating shaft. The top end of the inner tube is located inside the outer tube, and the rotating shaft passes upward through the cover and is connected to a fan blade located at the top end of the outer tube.

[0008] More preferably, the water inlet is located near the top of the inner tube, the impeller is located below the water inlet, and the jet nozzle is located below the impeller.

[0009] More preferably, the inner tube has two water inlets on its side, which are respectively located near the top and bottom of the inner tube. Two sets of impellers are located between the two water inlets, which are respectively located near the two water inlets. The jet nozzle is located between the two sets of impellers.

[0010] More preferably, the bottom end of the outer tube is fixedly connected to a guide sleeve with the same inner diameter and coaxially arranged, and the end of the guide sleeve away from the outer tube is flared.

[0011] More preferably, the bottom end of the inner tube is fixedly connected to a coaxially arranged steam guide sleeve via a connecting rod. The diameter of the steam guide sleeve is larger than that of the inner tube and smaller than that of the outer tube. The rotating shaft passes downward through the cover and is connected to a fan blade located inside the steam guide sleeve.

[0012] In a further preferred embodiment, the top end of the steam guide sleeve extends upward to above the bottom cover, and the bottom end of the steam guide sleeve is flared and has a gap between it and the flow guide sleeve.

[0013] According to an embodiment of the present invention, a rotary film device is also provided, comprising the rotary film tube described above.

[0014] According to an embodiment of the present invention, a swirl film deaerator is also provided, comprising the swirl film deaerator described above.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The swirl film tube includes a coaxial outer tube and an inner tube. The two ends of the outer tube are the same as the outside, and the two ends of the inner tube are provided with caps. A flow rotation component is provided inside the inner tube. Under the action of water flow inside the inner tube, it can generate rotational motion. Moreover, the flow rotation component is connected to an airflow acceleration component located outside the inner tube and inside the outer tube. The flow rotation component drives the airflow acceleration component to move, accelerating the airflow motion, so that the steam at the bottom of the swirl film tube passes through the outer tube more quickly, thereby rapidly refreshing the steam between the outer tube and the inner tube, ensuring that the steam between the outer tube and the inner tube is in a high temperature state, thereby improving the heating effect of steam on the water film on the inner wall of the outer tube; at the same time, the accelerated rising steam can also fully interact with the water film skirt generated at the outlet of the outer tube, thereby improving the heat exchange efficiency between steam and water, ensuring that the water can be heated to a thermal saturation state quickly and effectively. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a spiral film tube structure according to the present invention.

[0017] Figure 2 This is a top view schematic diagram of the jet nozzle and inner tube in a swirl tube according to the present invention.

[0018] Figure 3This is a schematic diagram of a certain embodiment of a rotary film tube according to the present invention.

[0019] Figure 4 This is a schematic diagram of another embodiment of the spiral film tube of the present invention.

[0020] In the above figures: 1. Outer pipe; 101. Guide sleeve; 2. Inner pipe; 201. Cover; 202. Inlet; 203. Jet nozzle; 204. Steam guide sleeve; 3. Flow rotation assembly; 301. Rotating shaft; 302. Impeller; 303. Positioning block; 4. Airflow acceleration assembly; 401. Fan blade. Detailed Implementation

[0021] The technical solutions of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] like Figure 1 As shown, a rotary film tube includes an outer tube 1 and an inner tube 2 arranged coaxially. The outer tube 1 and the inner tube 2 are connected by welding through several positioning blocks. The inner tube 2 is provided with caps 201 at both ends and water inlets 202 on the side. The water inlets 202 are connected to an inlet pipe, which penetrates the side wall of the outer tube 1.

[0023] like Figure 2 As shown, the inner tube 2 has multiple sets of jet nozzles 203 evenly distributed along its axial direction on its side wall. Each set of jet nozzles 203 has multiple nozzles and is evenly distributed along the circumference of the inner tube 2. Each jet nozzle 203 has an angle between itself and its corresponding radial direction in the horizontal plane and is inclined in the same direction. Each jet nozzle 203 is also inclined downward, so that a certain spray angle is formed between the jet nozzle 203 and the inner wall of the outer tube 1. The water flow ejected from the jet nozzle 203 rotates down the inner wall at high speed and forms a thin water film in the tube. When it reaches the outlet of the outer tube 1, a thin water film skirt is formed due to the centrifugal force. Steam flows from bottom to top through the tube to carry out heat and mass transfer and heat the water to the saturation temperature under the working pressure.

[0024] Meanwhile, the inner tube 2 is provided with a flow rotation component 3, which is connected to an airflow acceleration component 4 located at the outer end of the inner tube 2. When water flows through the inner tube 2, the flow rotation component 3 can drive the airflow acceleration component 4 to accelerate the steam through the outer tube 1.

[0025] This allows more hot steam to enter between the outer tube 1 and the inner tube 2, and accelerates the passage of hot steam through the outer tube 1, thus accelerating the renewal of steam between the outer tube 1 and the inner tube 2. This keeps the internal steam at a high temperature, and before the water film leaves the outer tube 1, the steam can generate sufficient heat exchange with the water film, effectively increasing the temperature of the water film.

[0026] Specifically, such as Figure 1As shown, the airflow acceleration component 4 includes multiple fan blades 401 connected to and driven to rotate by the flow rotation component 3. The edge of the fan blade 401 is fitted with the outer tube 1 with a clearance slightly greater than zero, which can effectively improve the steam acceleration effect.

[0027] Specifically, such as Figure 1 As shown, the flow rotation assembly 3 includes a rotating shaft 301 coaxially rotatably disposed inside the inner tube 2 and an impeller 302 fixedly connected to the rotating shaft 301. When high-speed water flows through the inner tube 2, the impeller 302 can drive the rotating shaft 301 to rotate. The top end of the inner tube 2 is located inside the outer tube 1. The rotating shaft 301 passes upward through the cover 201 and is connected to a fan blade 401 located at the top end of the outer tube 1. The rotating shaft 301 is connected to the cover 201 through a rotating bearing, and a bearing seat is also connected to the bottom of the rotating shaft 301. The bearing seat is fixedly connected to the inner wall of the inner tube 2 through several positioning blocks 303 to maintain the stability of the rotating shaft 301 when rotating. When the rotating shaft 301 rotates, it drives the fan blade 401 to rotate, thereby achieving the effect of accelerating the airflow and driving steam into the outer tube 1.

[0028] In order to fully ensure the effect of water flow on impeller 302, in a further embodiment, the inlet 202 is located near the top of the inner tube 2, the impeller 302 is located below the inlet 202, and the jet nozzle 203 is located below the impeller 302. The water flow that enters the inner tube 2 through the inlet 202 first acts on the impeller 302 and then is ejected through the jet nozzle 203.

[0029] At the same time, when the water flow drives the impeller 302 to rotate, the water flow will also generate rotational motion due to the reaction force of the impeller 302. When the jet nozzle 203 is set, the tilt angle of the jet nozzle 203 can be made to be consistent with the direction of the water flow rotation, which can increase the speed of the water flow ejected from the jet nozzle 203.

[0030] In order to facilitate the formation of a water film skirt, in a further embodiment, a guide sleeve 101 with the same inner diameter and coaxially arranged is fixedly connected to the bottom end of the outer tube 1, and the end of the guide sleeve 101 away from the outer tube 1 is flared.

[0031] like Figure 3 As shown, in order to reduce the impact of steam flow on the water film skirt at the outlet of the guide sleeve 101 and improve the steam flow effect, in a further embodiment, the bottom end of the inner tube 2 is fixedly connected to a coaxially arranged steam guide sleeve 204 by a connecting rod. The diameter of the steam guide sleeve 204 is larger than that of the inner tube 2 and smaller than that of the outer tube 1. The rotating shaft 301 passes through the cover 201 downward and is connected to a fan blade 401 located inside the steam guide sleeve 204. The two sets of fan blades 401 at the top and bottom work synchronously, which can effectively improve the steam flow effect.

[0032] To further reduce the impact of steam flow on the water film skirt, in a further embodiment, the top end of the steam guide sleeve 204 extends upward to above the bottom cover 201, and the bottom end of the steam guide sleeve 204 is flared and has a gap with the flow guide sleeve 101. Under the action of the steam guide sleeve 204, the steam enters between the outer tube 1 and the inner tube 2 at a position close to the outer wall of the inner tube 2.

[0033] Example 2:

[0034] like Figure 4 As shown, unlike Embodiment 1, the inner tube 2 has two water inlets 202 on its side. The two water inlets 202 are respectively located near the top and bottom of the inner tube 2. Two sets of impellers 302 are located between the two water inlets 202. The two sets of impellers 302 are respectively located near the two water inlets 202. At this time, the blade angles of the two sets of impellers 302 are opposite. The jet nozzle 203 is located between the two sets of impellers 302, and water can flow through the two water inlets 202 at the same time. The two streams of water act on the impellers 302 at both ends, which can effectively increase the rotation speed of the shaft 301, thereby increasing the rotation speed of the fan blade 401.

[0035] Example 3:

[0036] A rotary film generator includes a rotary film tube as described in Embodiment 1 or Embodiment 2, with an inlet 202 connected to the inlet pipe of the rotary film generator via an inlet pipe.

[0037] Example 4:

[0038] A swirl film deaerator includes the swirl film device in Example 3, wherein both ends of the outer tube 1 are connected to the internal space of the tower head.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A spiral film tube, comprising an outer tube (1) and an inner tube (2) coaxially arranged, characterized in that, The inner tube (2) is provided with caps (201) at both ends and water inlets (202) on the side. Multiple sets of jet nozzles (203) are provided on the side wall of the inner tube (2) and are evenly distributed along its axial direction. Each set of jet nozzles (203) has multiple nozzles and is evenly distributed along the circumference of the inner tube (2). Each jet nozzle (203) has an angle between itself and its corresponding radial direction in the horizontal plane and is inclined in the same direction. Each jet nozzle (203) is also inclined downward. The inner tube (2) is provided with a flow rotation component (3). The flow rotation component (3) is connected to an airflow acceleration component (4) located at the outer end of the inner tube (2). When water flows through the inner tube (2), the flow rotation component (3) can drive the airflow acceleration component (4) to accelerate the steam through the outer tube (1). The airflow acceleration component (4) includes a plurality of fan blades (401) connected to and driven to rotate by the flow rotation component (3). The flow rotation assembly (3) includes a rotating shaft (301) coaxially rotatably disposed inside the inner tube (2) and an impeller (302) fixedly connected to the rotating shaft (301). The top end of the inner tube (2) is located inside the outer tube (1). The rotating shaft (301) passes through the cover (201) upward and is connected to a fan blade (401) located at the top end inside the outer tube (1). The inner tube (2) is provided with two water inlets (202) on its side. The two water inlets (202) are respectively located near the top and bottom of the inner tube (2). Two sets of impellers (302) are provided between the two water inlets (202). The two sets of impellers (302) are respectively located near the two water inlets (202). The jet nozzle (203) is located between the two sets of impellers (302). The bottom end of the outer tube (1) is fixedly connected to a guide sleeve (101) with the same inner diameter and coaxially arranged. The end of the guide sleeve (101) away from the outer tube (1) is flared. The bottom end of the inner tube (2) is fixedly connected to a coaxially arranged steam guide sleeve (204) by a connecting rod. The diameter of the steam guide sleeve (204) is larger than that of the inner tube (2) and smaller than that of the outer tube (1). The rotating shaft (301) passes through the cover (201) downward and is connected to a fan blade (401) located inside the steam guide sleeve (204).

2. The spiral film tube according to claim 1, characterized in that, The top end of the steam guide sleeve (204) extends upward to above the bottom cover (201), and the bottom end of the steam guide sleeve (204) is flared and has a gap between it and the flow guide sleeve (101).

3. A film spinning device, characterized in that, Includes a rotary film tube as described in any one of claims 1-2.

4. A swirl film deaerator, characterized in that, Including the rotary film device as described in claim 3.

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