A boiler deaerator

Abstract

The utility model discloses a kind of boiler oxygen-removing apparatus belong to boiler technical field, including vertical cylindrical shell, cyclone water distribution unit, umbrella-shaped steam distributor;The cyclone water distribution unit is fixedly installed on the upper portion of shell inner wall, and it is composed of helical guide vane and annular water collecting tank located just above it;The umbrella-shaped steam distributor is located below cyclone water distribution unit, and it includes conical distribution plate, central steam pipe and at least 3 radial branch pipes arranged coaxially with shell;The shell top is provided with exhaust port, the upper portion of side wall is provided with steam inlet connection central steam pipe, the middle portion of side wall is provided with boiler connection port connection annular water collecting tank, and the bottom is provided with oxygen-removing water outlet.This application passes through the helical guide vane of cyclone water distribution unit, so that the water flow entering produces strong rotation, is thrown to shell inner wall under the action of centrifugal force, forms uniform water film, increases the contact area of water and steam, improves oxygen-removing effect.

Description

Technical Field

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

[0002] During boiler operation, dissolved oxygen in the feedwater can cause severe corrosion to the boiler system, affecting its safe operation and service life. Traditional boiler deaerators have certain shortcomings in terms of deoxygenation effect, working efficiency, and equipment operational stability. For example, the water distribution and steam distribution devices of some deaerators are not optimized in structure, resulting in poor mixing of water and steam and affecting deoxygenation efficiency. At the same time, the monitoring and control of parameters such as liquid level and temperature during equipment operation are not precise enough, which can easily lead to problems such as excessive liquid level fluctuations and abnormal temperatures, thereby affecting the deoxygenation effect and safe operation of the equipment. Therefore, there is an urgent need for a boiler deaerator with a reasonable structure, good deoxygenation effect, stable operation, and the ability to effectively monitor and control operating parameters. Summary of the Invention

[0003] To address the aforementioned problems, this utility model discloses a boiler deaerator. Through the spiral guide plate of the swirl water distribution unit, the incoming water flow is made to rotate strongly and thrown towards the inner wall of the shell under the action of centrifugal force, forming a uniform water film, which increases the contact area between water and steam and improves the deaeration effect.

[0004] To achieve the above objectives, the specific technical solution of this application is as follows: A boiler deaerator includes a vertical cylindrical shell, a swirl water distribution unit, and an umbrella-shaped steam distributor. The swirl water distribution unit is fixedly installed on the upper part of the inner wall of the shell and consists of a spiral guide plate and an annular water collection tank located directly above it. The umbrella-shaped steam distributor is located below the swirl water distribution unit and includes a conical distribution plate coaxially arranged with the shell, a central steam pipe, and at least three radial branch pipes. The top of the shell has an exhaust port, the upper part of the side wall has a steam inlet connected to the central steam pipe, the middle part of the side wall has a boiler connection port connected to the annular water collection tank, and the bottom has a deaerated water outlet.

[0005] Based on the above technical features, preferably, the spiral guide plate is a continuous spiral curved surface structure, with its outer edge welded to the inner wall of the shell; the annular water collection tank is fixed by a stainless steel bracket, and the water inlet pipe passes through the side wall of the shell and communicates with the annular water collection tank.

[0006] Based on the above technical features, preferably, the cone angle of the cone-shaped distribution plate is 90°-120°, and the cone-shaped distribution plate has evenly distributed through holes; one end of the radial branch pipe is vertically welded to the lower part of the central steam pipe, and the other end is inclined downward at 25°-35° and welded to the inner wall of the shell.

[0007] Based on the above technical features, preferably, a baffle demister is provided inside the exhaust port, and the baffle demister is composed of multiple layers of staggered stainless steel corrugated plates.

[0008] Based on the above technical features, preferably, the inner wall of the annular water collection tank is lined with a thick silicon carbide wear-resistant layer, and the lower surface of the conical distribution plate is welded with a tortoise shell mesh and then sprayed with an alumina ceramic coating.

[0009] Based on the above technical features, preferably, a PT100 temperature sensor is built into the lower side wall of the housing, and the sensor probe extends to the central axis of the housing.

[0010] Based on the above technical features, preferably, a saddle-type support is welded to the bottom of the shell, and two mounting grooves are opened on the bottom plate of the support.

[0011] Compared with the prior art, the beneficial effects of this application are as follows: This application uses the spiral guide plate of the vortex water distribution unit to make the incoming water flow generate strong rotation, and under the action of centrifugal force, it is thrown towards the inner wall of the shell to form a uniform water film, which increases the contact area between water and steam and improves the deoxygenation effect. The reasonable setting of the cone angle and through holes of the conical distribution plate of the umbrella-shaped steam distributor, as well as the radial branch pipe, enables the steam to be sprayed upward evenly and fully mixed with the rotating water flow, forming a good water-steam countercurrent contact environment, enhancing the deoxygenation reaction process, and effectively reducing the dissolved oxygen content in the water. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of a boiler deaerator according to the present invention; Figure 2 This is a schematic diagram of the conical distribution plate in this utility model; List of identifiers in attached diagrams: 100. Shell; 110. Support; 200. Swirl water distribution unit; 210. Spiral guide plate; 220. Water collection tank; 221. Stainless steel bracket; 222. Water inlet pipe; 300. Umbrella-shaped steam distributor; 310. Conical distribution plate; 311. Through hole; 320. Central steam pipe; 330. Radial branch pipe; 400. Steam inlet; 500. Boiler connection port; 600. Deoxygenated water outlet; 700. Exhaust port; 710. Baffle demister; 800. Temperature sensor. Detailed Implementation

[0013] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0014] It should be noted that the terms "upper," "lower," "left," "right," "front," and "rear" used in the following description refer to the directions shown in the accompanying drawings, while the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively. Furthermore, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0015] like Figure 1 As shown, a boiler deaerator includes a vertical cylindrical shell 100, a swirling water distribution unit 200, and an umbrella-shaped steam distributor 300. The swirling water distribution unit 200 is fixedly installed on the upper part of the inner wall of the shell 100 and consists of a spiral guide plate 210 and an annular water collecting trough 220 located directly above it. The annular water collecting trough 220 distributes the incoming water into a uniform circumferential overflow, and the spiral guide plate 210 converts the overflow water into a rotating thin water film. The umbrella-shaped steam distributor 300 is preferably located 300-500mm below the swirling water distribution unit 200 and includes a conical distribution plate 310 coaxially arranged with the shell 100, a central steam pipe 320, and at least 3 A radial branch pipe 330 is provided, which has a steam outlet facing the conical distribution plate 310; the top of the shell 100 is provided with an exhaust port 700, the upper part of the side wall is provided with a steam inlet 400 connected to the central steam pipe 320, the middle part of the side wall is provided with a boiler connection port 500 connected to the annular water collection tank 220, and the bottom is provided with a deoxygenated water outlet 600.

[0016] The spiral guide plate 210 has a continuous spiral curved surface structure with a spiral angle of 55°-65°, and its outer edge is welded to the inner wall of the shell 100; the annular water collection tank 220 is fixed by a stainless steel bracket 221, and the water inlet pipe 222 passes through the side wall of the shell and communicates with the annular water collection tank 220.

[0017] The cone-shaped distribution plate 310 preferably has a cone angle of 90°-120°, and the cone surface is evenly distributed with through holes 311, the diameter of which is preferably 5-8mm. One end of the radial branch pipe 330 is vertically welded to the lower part of the central steam pipe 320, and the other end is inclined downward at 25°-35° and welded to the inner wall of the shell 100.

[0018] A baffle demister 710 is installed inside the exhaust port 700. The baffle demister 710 is composed of multiple layers of staggered stainless steel corrugated plates. The preferred spacing between the corrugated plates is 10-15mm. It can effectively remove water droplets carried in the exhaust, prevent water droplet loss, and improve the working efficiency and safety of the deaerator.

[0019] The inner wall of the annular water collection tank 220 is lined with a 2mm thick silicon carbide wear-resistant layer 223, and the lower surface of the conical distribution plate 310 is welded with a tortoise shell mesh and then sprayed with an alumina ceramic coating 312, which greatly enhances the wear resistance and corrosion resistance of the components, extends the service life of the equipment, and reduces maintenance costs.

[0020] Temperature measurement holes are provided on the lower side wall of the housing 100, and a PT100 temperature sensor 800 is built in. The sensor probe extends to the central axis of the housing, which can accurately monitor the temperature changes inside the housing, provide important parameters for equipment operation monitoring, facilitate timely detection and handling of abnormal situations, and ensure the safe and stable operation of the equipment.

[0021] The bottom of the shell 100 is welded with a saddle-type support 110. The base plate of the support has two elongated hole mounting slots 111. The length of the holes is perpendicular to the axis of the shell, which makes the equipment installation more convenient and stable, and can adapt to a certain range of foundation unevenness, thereby improving the installation quality and operational stability of the equipment.

[0022] Working principle: The spiral guide plate of the vortex water distribution unit adopts a continuous spiral curved surface structure, which makes the incoming water flow generate strong rotation. Under the action of centrifugal force, it is thrown towards the inner wall of the shell to form a uniform water film, which increases the contact area between water and steam and improves the deoxygenation effect.

[0023] As the rotating water film falls, its surface area increases. Steam through the through-holes of the conical distribution plate comes into countercurrent contact with the water film. Dissolved oxygen diffuses from the water film to the vapor phase due to Henry's law. The rotation of the water film generates centrifugal force, which accelerates the release of oxygen. This allows the steam to be sprayed upwards evenly and mix thoroughly with the rotating water flow, forming a good countercurrent contact environment between water and steam. This enhances the deoxygenation process and effectively reduces the dissolved oxygen content in the water.

[0024] Fresh steam enters the central steam pipe 320 from the steam inlet 400, and is injected at high speed through the radial branch pipe 330 that is inclined downward at 30°. It impacts the lower surface of the umbrella-shaped distribution plate 310. Part of it goes upward from the through hole, and part of it diffuses radially along the conical surface. When it encounters the bottom wall of the shell, it turns back upward. The returned steam and the water film form turbulent shear, realizing enhanced mass transfer by active penetration of the vapor phase into the liquid phase. This is the secondary deoxygenation process.

[0025] The water, after being deoxygenated twice, falls into the lower water storage area of ​​the shell (100) and undergoes static residence deoxygenation for 5-10 minutes at a saturation temperature of 104℃@0.12MPa.

[0026] The oxygen / non-condensable gas released during the deoxygenation process rises to the top, and after water droplets are intercepted by the baffle demister 710, it is discharged from the exhaust port 700.

[0027] It should be noted that the accompanying drawings merely illustrate the technical concept of the present invention and should not be used to limit the scope of protection of the present invention. For those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and all such improvements and modifications fall within the scope of protection of the claims of the present invention.

Claims

1. A boiler deaerator, characterized in that: The system includes a vertical cylindrical shell (100), a swirling water distribution unit (200), and an umbrella-shaped steam distributor (300). The swirling water distribution unit (200) is fixedly installed on the upper part of the inner wall of the shell (100) and consists of a spiral guide plate (210) and an annular water collection tank (220) located directly above it. The umbrella-shaped steam distributor (300) is located below the swirling water distribution unit (200) and includes a conical distribution plate (310) coaxially arranged with the shell (100), a central steam pipe (320), and at least three radial branch pipes (330). The shell (100) has an exhaust port (700) at the top, a steam inlet (400) on the upper part of the side wall connected to the central steam pipe (320), a boiler connection port (500) in the middle of the side wall connected to the annular water collection tank (220), and a deoxygenated water outlet (600) at the bottom.

2. A boiler deaerator according to claim 1, characterized in that: The spiral guide plate (210) is a continuous spiral curved surface structure, and its outer edge is welded to the inner wall of the shell (100); the annular water collection tank (220) is fixed by a stainless steel bracket (221), and the water inlet pipe (222) passes through the side wall of the shell and communicates with the annular water collection tank (220).

3. A boiler deaerator according to claim 1, characterized in that: The cone angle of the cone-shaped distribution plate (310) is 90°-120°, and the cone-shaped distribution plate is evenly distributed with through holes (311); one end of the radial branch pipe (330) is vertically welded to the lower part of the central steam pipe (320), and the other end is inclined downward at 25°-35° and welded to the inner wall of the shell (100).

4. A boiler deaerator according to claim 1, characterized in that: The exhaust port (700) is equipped with a baffle demister (710), which is composed of multiple layers of staggered stainless steel corrugated plates.

5. A boiler deaerator according to claim 1, characterized in that: The inner wall of the annular water collection tank (220) is lined with a thick silicon carbide wear-resistant layer, and the lower surface of the conical distribution plate (310) is welded with a tortoise shell mesh and then sprayed with an alumina ceramic coating.

6. A boiler deaerator according to claim 1, characterized in that: A temperature sensor (800) is built into the lower side wall of the housing (100), with the sensor probe extending to the central axis of the housing.

7. A boiler deaerator according to claim 1, characterized in that: A saddle-type support (110) is welded to the bottom of the housing (100), and two mounting slots are opened on the base plate of the support.

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