A boiler feed water deaerator

Abstract

A boiler feed water deaerator, including deaerator body, deaerator body includes deaerating tower and deaerating water tank which are arranged in communication, deaerating tower is sequentially provided with exhaust pipe, water inlet and the spin membrane tube assembly connected therewith from top to bottom, the axis of exhaust pipe is coaxial with the axis of deaerating tower, the deaerating tower is provided with the fairing between the lower end of exhaust pipe and the primary deaerating zone, the fairing is the gradually expanding structure which is small at top and big at bottom, its axis is coaxial with the axis of exhaust pipe, the upper end of fairing is closed structure, the fairing is connected with the inner wall of deaerating tower, the height position of fairing is adjustable, and the length of lower part of fairing along horizontal direction is greater than the inner diameter of exhaust pipe, the water droplet catching net is arranged below the fairing, the lower part of water droplet catching net is provided with water collecting end, the collecting pipe is arranged below the water collecting end, and the collecting pipe is communicated with the spin membrane tube assembly or deaerating water tank, the utility model forces steam to flow around the edge of cover to enter exhaust port, prolongs steam path, and avoids that steam not participating in heat exchange directly escapes.

Description

Technical Field

[0001] This utility model relates to the field of deaerator technology, specifically a boiler feedwater deaerator. Background Technology

[0002] A swirl film deaerator is a thermal deoxygenation device used to remove dissolved oxygen from boiler feedwater. It is widely used in industries such as power, chemical, and petroleum. The working principle of a swirl film deaerator is to heat water to its saturation temperature using heated steam, causing dissolved oxygen and other non-condensable gases to precipitate and be discharged through the exhaust port, thereby preventing oxygen corrosion of the boiler and pipelines.

[0003] A typical swirl film deaerator, from top to bottom, includes an exhaust port, a water inlet and primary deaeration zone, a main deaeration zone, and a water storage and reheating zone. The primary deaeration zone has a swirl film tube connected to the water inlet, used to rotate the water to form a thin water film, increasing the steam contact area. The steam flows from bottom to top, expelling the released oxygen from the exhaust port. However, in existing technologies, steam is directly discharged from the exhaust port after passing through the water inlet and primary deaeration zones. This results in some steam not fully participating in heat exchange, leading to steam short-circuiting, reduced thermal efficiency, and affecting the discharge of released oxygen. Utility Model Content

[0004] To address the technical problems existing in the background art, this utility model provides a boiler feedwater deaerator.

[0005] The technical solution of this utility model is as follows: A boiler feedwater deaerator includes a deaerator body, which includes a deaerator tower and a deaerator water tank connected vertically. The deaerator tower is provided with an exhaust pipe, an inlet, and a swirl film tube assembly connected thereto from top to bottom. The axis of the exhaust pipe is coaxial with the axis of the deaerator tower. A guide hood is provided inside the deaerator tower between the lower end of the exhaust pipe and the primary deaerator zone. The guide hood has a gradually expanding structure with a smaller upper part and a larger lower part. Its axis is coaxial with the axis of the exhaust pipe. The upper end of the guide hood is a closed structure. The guide hood is connected to the inner wall of the deaerator tower through a first support member. The height of the guide hood is adjustable, and the lower part of the guide hood has a horizontal length greater than the inner diameter of the exhaust pipe. A water droplet collecting net is installed below the flow guide shroud. A water collection end is located at the bottom of the water droplet collecting net, and a collection pipe is located directly below the water collection end. The lower end of the collection pipe is connected to the swirl film tube assembly or the deoxygenated water tank.

[0006] The structure of the fairing is a cone-shaped or pyramidal structure with an open bottom and a hollow interior.

[0007] The specific structure of the water droplet trapping net is that it is an inverted cone-shaped structure with its diameter gradually increasing from bottom to top.

[0008] Preferably, the upper outer edge of the water droplet collecting net is provided with an annular mounting plate coaxial with it, and the annular mounting plate is connected to the inner wall of the guide shroud through a second support member.

[0009] Furthermore, the axis of the annular mounting plate is coaxial with that of the fairing.

[0010] The specific structure of the collection pipe is as follows: the collection pipe includes an integrally formed and interconnected water receiving section, a middle section and a vertical flow guiding section. The upper port of the water receiving section is located directly below the water collection end, the middle section is inclined downward, and the lower end of the vertical flow guiding section is connected to the swirl film tube assembly or the deoxygenated water tank.

[0011] Furthermore, the collection pipe is provided with multiple third supports along its extension direction, and the third supports are connected to the inner wall of the deaerator.

[0012] The deflector can force some of the steam to flow around its edge before entering the exhaust port. The steam contains tiny water droplets. To facilitate the capture of these tiny water droplets and reduce media loss, the ratio of the maximum outer diameter of the water droplet collection net to the maximum outer diameter of the deflector is 0.5-1, so that the water droplet collection net is located inside the deflector, which facilitates the capture of tiny water droplets.

[0013] The specific structure of the adjustable height of the flow guide is as follows: the first support includes a first connecting pipe and a second connecting pipe sleeved on its outer side. The upper part of the first connecting pipe is connected to the inner wall of the deaerator, and the lower end of the second connecting pipe is connected to the flow guide. Both the first and second connecting pipes are provided with corresponding connecting holes. The first and second connecting pipes are detachably connected by an adjusting member that passes through the connecting hole.

[0014] The beneficial effects of this utility model are as follows: The lower end of the baffle covers the area directly below the exhaust port, forcing the steam to flow around the edge of the baffle to enter the exhaust port. This process lengthens the steam path, ensuring that it makes full contact with the water flow and preventing steam that has not participated in heat exchange from escaping directly. High-speed rising steam may carry tiny water droplets. The deflector can cause the water droplets to fall back after colliding with the wall of the deflector due to inertia. Combined with the water droplet collection net, this reduces water loss and the risk of corrosion to the exhaust system. Non-condensable gases such as oxygen have low density and will naturally accumulate in the space at the top of the cover, making it easy to discharge them through the exhaust port. The guiding effect of the flow guide can make the steam evenly distributed across the entire deaerator cross section, avoiding excessively strong or weak local airflow and ensuring the stability of the swirling film and water film. As steam rises, tiny water droplets carried by it collide with the metal wires of the water droplet collection net. Due to surface tension, they adhere and accumulate, first gathering at the lower water collection end, and eventually falling back to the swirl film tube assembly or deoxygenated water tank. Attached Figure Description

[0015] In the attached diagram: Figure 1 This is a schematic diagram of the cross-sectional structure; Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle; Figure 3 A schematic diagram of the structure of the flow guide, water droplet trap, and collection pipe; Figure 4 for Figure 3 A three-dimensional image; Figure 5 This is a schematic diagram of the first support component. The components represented by the various reference numerals in the diagram are: 1. Deaerator body; 101. Deaerator tower; 1011. Exhaust pipe; 1012. Inlet; 1013. Swirl film tube assembly; 102. Deaerator water tank; 2. Flow guide hood; 3. First support component; 301. First connecting pipe; 302. Second connecting pipe; 303. Connecting hole; 304. Adjusting component; 4. Water droplet collection net; 401. Water collection end; 5. Collection pipe; 501. Water receiving section; 502. Intermediate section; 503. Vertical flow guide section; 6. Annular mounting plate; 7. Second support component; 8. Third support component. Detailed Implementation

[0016] See Figure 1 , Figure 2 and Figure 3 As shown, a boiler feedwater deaerator includes a deaerator body 1. The deaerator body 1 includes a deaerator tower 101 and a deaerator water tank 102 connected vertically. The deaerator tower 101 is provided with an exhaust pipe 1011, an inlet 1012 and a swirl film tube assembly 1013 connected thereto from top to bottom. The deaerator body 1 also includes steam inlets respectively provided in the deaerator tower 101 and the deaerator water tank 102. The steam inlets are used to provide steam, and the swirl film tube is used to rotate the water entering through the inlet 1012 to form a thin water film, thereby increasing the steam contact area. The steam flows from bottom to top and is used to discharge the released oxygen from the exhaust port.

[0017] The axis of the exhaust pipe 1011 is coaxial with the axis of the deaerator 101. A guide shroud 2 is provided inside the deaerator 101, located between the lower end of the exhaust pipe 1011 and the primary deaerator zone. The guide shroud 2 has a gradually expanding structure, smaller at the top and larger at the bottom, and its axis is coaxial with the axis of the exhaust pipe 1011. The upper end of the guide shroud 2 is a closed structure. The guide shroud 2 is connected to the inner wall of the deaerator 101 through a first support member 3. The height of the guide shroud 2 is adjustable, and the lower part of the guide shroud 2 has a horizontal length greater than the inner diameter of the exhaust pipe 1011. The guide shroud 2 is a conical or a pyramidal structure with an open bottom and a hollow interior. In this embodiment, the guide shroud 2 is a conical structure.

[0018] The lower end of the deflector 2 covers the area directly below the exhaust port, forcing the steam to flow around the edge of the hood before entering the exhaust port. This process lengthens the steam path, ensuring full contact with the water flow and preventing steam that has not participated in heat exchange from escaping directly. Furthermore, the rapidly rising steam may carry tiny water droplets, and the blocking effect of the deflector 2 causes the water droplets to collide with the wall of the deflector 2 due to inertia and fall back down. Combined with the water droplet collection net 4, this reduces water loss and the risk of corrosion in the exhaust system.

[0019] See Figure 3 and Figure 4 As shown, a water droplet collecting net 4 is provided below the flow guide hood 2. A water collection end 401 is provided at the lower part of the water droplet collecting net 4. A collection pipe 5 is provided directly below the water collection end 401. The lower end of the collection pipe 5 is connected to the swirl film tube assembly 1013 or the deoxygenated water tank 102. The water collected by the collection pipe 5 can enter the swirl film tube assembly 1013 or the deoxygenated water tank 102 for reuse.

[0020] The specific structure of the water droplet collecting net 4 is as follows: the water droplet collecting net 4 is an inverted cone-shaped structure, with its diameter gradually increasing from bottom to top. An annular mounting plate 6, coaxial with the upper end of the water droplet collecting net 4, is provided on its outer edge. The annular mounting plate 6 is connected to the inner wall of the guide shroud 2 via a second support member 7. The annular mounting plate 6 facilitates the installation of the water droplet collecting net 4. To facilitate the installation of the water droplet collecting net 4 and to enable it to capture a large number of tiny water droplets, the axis of the annular mounting plate 6 is coaxial with the guide shroud 2.

[0021] The water droplet collecting net 4 has a cone-shaped mesh structure, which does not affect the steam being guided to the surrounding area by the guide shroud 2. Moreover, it can also use its own structure to capture the moisture in the steam. The moisture accumulates from top to bottom to the water collection end 401, and can eventually be collected by the collection pipe 5 below it.

[0022] The specific structure of the collection pipe 5 is as follows: the collection pipe 5 includes an integrally formed and interconnected water receiving section 501, a middle section 502, and a vertical flow guiding section 503. The upper end of the water receiving section 501 is located directly below the water collecting end 401. The middle section 502 is inclined downwards. The lower end of the vertical flow guiding section 503 is connected to the swirl film tube assembly 1013 or the deaerator water tank 102. The collection pipe 5 is provided with multiple third support members 8 along its extension direction. The third support members 8 are connected to the inner wall of the deaerator tower 101, so that the collection pipe 5 will not shake and its water receiving function will not be affected.

[0023] The deflector 2 forces some steam to flow around its edge before entering the exhaust port. The steam contains tiny water droplets. To facilitate the capture of these tiny water droplets and reduce media loss, the ratio of the maximum outer diameter of the water droplet collecting net 4 to the maximum outer diameter of the deflector 2 is 0.5-1, so that the water droplet collecting net 4 is located on the lower inner side of the deflector 2, which facilitates the capture of tiny water droplets.

[0024] See Figure 5As shown, if the distance between the guide shroud 2 and the lower end of the exhaust pipe 1011 is too small, the steam velocity will be too high, increasing the exhaust resistance and potentially causing vibration; if the distance is too large, it will reduce the steam's ability to carry water droplets, resulting in incomplete exhaust. To this end, the height of the flow guide 2 is adjustable. Multiple sets of first support members 3 can be provided. Each first support member 3 includes a first connecting pipe 301 and a second connecting pipe 302 sleeved on its outer side. The upper part of the first connecting pipe 301 is connected to the inner wall of the deaerator 101, and the lower end of the second connecting pipe 302 is connected to the flow guide 2. Both the first connecting pipe 301 and the second connecting pipe 302 have corresponding connecting holes 303. The first connecting pipe 301 and the second connecting pipe 302 are detachably connected by an adjusting member 304 passing through the connecting hole 303. The connecting hole 303 can be a threaded hole, and the adjusting member 304 can be an adjusting bolt, which facilitates the fixed connection of the first connecting pipe 301 and the second connecting pipe 302 by adjusting the adjusting bolt. When it is necessary to adjust the height of the flow guide 2, the adjusting bolt is loosened, and the position of the second connecting pipe 302 in the first connecting pipe 301 is adjusted. After the position is adjusted, the connecting hole 303 of the first connecting pipe 301 is aligned with the connecting hole 303 of the second connecting pipe 302, and then connected by adjusting the bolt.

Claims

1. A boiler feedwater deaerator, comprising a deaerator body (1), the deaerator body (1) comprising a deaerator tower (101) and a deaerator water tank (102) connected vertically, the deaerator tower (101) being provided with an exhaust pipe (1011), an inlet (1012), and a swirl film tube assembly (1013) connected thereto, from top to bottom, the axis of the exhaust pipe (1011) being coaxial with the axis of the deaerator tower (101), characterized in that, The deaerator (101) is provided with a flow guide (2) located between the lower end of the exhaust pipe (1011) and the primary deaerator zone. The flow guide (2) has a gradually expanding structure with a smaller upper part and a larger lower part. Its axis is coaxial with the axis of the exhaust pipe (1011). The upper end of the flow guide (2) is a closed structure. The flow guide (2) is connected to the inner wall of the deaerator (101) through the first support member (3). The height of the flow guide (2) is adjustable, and the lower part of the flow guide (2) has a horizontal length greater than the inner diameter of the exhaust pipe (1011). The flow guide shroud (2) is provided with a water droplet collection net (4) below it. The lower part of the water droplet collection net (4) is provided with a water collection end (401). A collection pipe (5) is provided directly below the water collection end (401). The lower end of the collection pipe (5) is connected to the swirl film tube assembly (1013) or the deoxygenated water tank (102).

2. A boiler feedwater deaerator according to claim 1, characterized in that, The flow guide (2) is a cone-shaped or pyramidal structure with an open bottom and a hollow interior.

3. A boiler feedwater deaerator according to claim 1, characterized in that, The water droplet capturing net (4) is an inverted cone-shaped structure with its diameter gradually increasing from bottom to top.

4. A boiler feedwater deaerator according to claim 3, characterized in that, The upper end of the water droplet collecting net (4) is provided with an annular mounting plate (6) coaxial with it, and the annular mounting plate (6) is connected to the inner wall of the guide shroud (2) through the second support member (7).

5. A boiler feedwater deaerator according to claim 4, characterized in that, The axis of the annular mounting plate (6) is coaxial with the flow guide (2).

6. A boiler feedwater deaerator according to claim 1, characterized in that, The collection pipe (5) includes an integrally formed and connected water receiving section (501), a middle section (502) and a vertical flow guide section (503). The upper end of the water receiving section (501) is located directly below the water collection end (401), the middle section (502) is inclined downward, and the lower end of the vertical flow guide section (503) is connected to the swirl film tube assembly (1013) or the deoxygenated water tank (102).

7. A boiler feedwater deaerator according to claim 6, characterized in that, The collecting pipe (5) is provided with a plurality of third support members (8) along its extension direction, and the third support members (8) are connected to the inner wall of the deaerator (101).

8. A boiler feedwater deaerator according to claim 3, characterized in that, The ratio of the maximum outer diameter of the water droplet collecting net (4) to the maximum outer diameter of the flow guide (2) is 0.5-1.

9. A boiler feedwater deaerator according to claim 1, characterized in that, The first support member (3) includes a first connecting pipe (301) and a second connecting pipe (302) sleeved on its outer side. The upper part of the first connecting pipe (301) is connected to the inner wall of the deaerator (101), and the lower end of the second connecting pipe (302) is connected to the flow guide (2). The first connecting pipe (301) and the second connecting pipe (302) are both provided with corresponding connecting holes (303). The first connecting pipe (301) and the second connecting pipe (302) are detachably connected by an adjusting member (304) passing through the connecting hole (303).

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