A boiler feedwater deoxygenation device

Abstract

This invention discloses a raw water deoxygenation device for boiler feedwater, belonging to the field of boiler feedwater deoxygenation technology. It includes a central water pipe and a shell surrounding the central water pipe; a first sealing cavity and a second sealing cavity are formed between the shell and the central water pipe; the first sealing cavity contains several membrane fiber tubes that communicate with the second sealing cavity; the second sealing cavity is connected to a negative pressure gas source; the central water pipe has several water distribution holes that communicate with the first sealing cavity; and the shell has a drain outlet that communicates with the first sealing cavity. This invention provides a raw water deoxygenation device for boiler feedwater that solves the problems of uneven water distribution, low membrane surface utilization, and poor deoxygenation effect in existing membrane separation deoxygenation devices.

Description

Technical Field

[0001] This invention belongs to the field of boiler feedwater deoxygenation technology, and particularly relates to a raw water deoxygenation device for boiler feedwater. Background Technology

[0002] In boiler feedwater systems, dissolved oxygen in the water can cause corrosion of metal pipes, shorten equipment lifespan, and increase maintenance costs. Therefore, it is necessary to reduce the oxygen content of the feedwater before supplying it to the boiler.

[0003] Existing deoxygenation technologies mainly include thermal deoxygenation and chemical deoxygenation. Thermal deoxygenation consumes a large amount of heat energy, resulting in high operating costs; chemical deoxygenation requires the addition of chemical agents, which not only increases operating costs but may also introduce new impurities, causing secondary pollution to the water. Meanwhile, membrane separation deoxygenation technology, as a novel deoxygenation method, is not only energy-efficient but also pollution-free. However, current membrane separation deoxygenation devices used for separating oxygen in makeup water have shortcomings in water distribution structure and water flow control, easily leading to low membrane surface utilization and unsatisfactory deoxygenation effects. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a raw water deoxygenation device for boiler feedwater, so as to solve the problems of uneven water distribution, low membrane surface utilization, and poor deoxygenation effect of existing membrane separation deoxygenation devices.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a raw water deoxygenation device for boiler feedwater, comprising a central water pipe and a shell covering the outer periphery of the central water pipe;

[0006] The shell and the central water pipe form a first sealing cavity and a second sealing cavity;

[0007] The first sealing cavity is provided with a plurality of membrane fiber tubes that can communicate with the second sealing cavity. The second sealing cavity can be connected to a negative pressure air source. The central water pipe is provided with a plurality of water distribution holes that can communicate with the first sealing cavity. The housing is provided with a drain outlet that communicates with the first sealing cavity.

[0008] Optionally, it also includes a plurality of baffles disposed in the first sealed cavity, the inner or outer sides of the plurality of baffles alternately abutting against the outer wall of the central water pipe or the inner wall of the housing, and each of the membrane fiber tubes can be inserted through the baffle.

[0009] Optionally, the cross-section of the spoiler disk is corrugated.

[0010] Optionally, the baffle plate is provided with a baffle plate perpendicular to the water flow direction, and the width of the baffle plate is less than half the distance between two adjacent baffle plates.

[0011] Optionally, several of the membrane fiber tubes are arranged in a circumferential array around the central water pipe.

[0012] Optionally, a plurality of the water distribution holes are arranged in a circumferential array along the central water pipe.

[0013] Optionally, the inner wall of the membrane fiber tube is provided with protrusions or grooves, and the outer wall of the membrane fiber tube is provided with spiral patterns.

[0014] Optionally, an oxygen content detection module is installed inside the drain outlet.

[0015] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The boiler feedwater deoxygenation device in this technical solution can evenly distribute water through the water distribution holes of the central water pipe, so that the feedwater can fully contact the membrane fiber tube, and achieve efficient separation and purification by means of the membrane fiber tube and the negative pressure gas source. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0017] Figure 1 This is a cross-sectional structural schematic diagram of the boiler feedwater deaeration device in a preferred embodiment of the present invention;

[0018] Figure 2 This is a preferred embodiment of the present invention. Figure 1 A schematic cross-sectional view of the structure at point B;

[0019] Figure 3 This is a schematic diagram of the spoiler disk in a preferred embodiment of the present invention;

[0020] Among them, 1. central water pipe; 101. first sealing cavity; 102. second sealing cavity; 103. water distribution hole; 2. shell; 201. drain outlet; 3. membrane fiber tube; 4. baffle plate; 401. baffle plate. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention and therefore only show the components relevant to the present invention.

[0022] It should be noted that if directional indicators (such as up, down, bottom, top, etc.) are involved in this embodiment, these directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly. The terms "first" and "second" 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. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature. Unless otherwise explicitly specified and limited, the terms "set," "connected," and "linked" 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 direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0023] like Figures 1-3 As shown, a boiler feedwater deaeration device includes a central water pipe 1 and a housing 2 covering the outer periphery of the central water pipe 1. The housing 2 and the central water pipe 1 form a first sealing cavity 101 and a second sealing cavity 102. The first sealing cavity 101 is provided with a plurality of membrane fiber tubes 3 that can communicate with the second sealing cavity 102. The second sealing cavity 102 can be connected to a negative pressure gas source. The central water pipe 1 is provided with a plurality of water distribution holes 103 that can communicate with the first sealing cavity 101. The housing 2 is provided with a drain outlet 201 that communicates with the first sealing cavity 101.

[0024] Specifically, the central water pipe 1 connects to the makeup water requiring deoxygenation. As the makeup water passes through the central water pipe 1, it enters the first sealed chamber 101 evenly through the water distribution holes 103, ensuring sufficient contact between the makeup water and the membrane fiber tubes 3. Simultaneously, the second sealed chamber 102, connected to the negative pressure gas source, creates a negative pressure area within the membrane limiting tube, separating oxygen from the makeup water through the membrane limiting tube. The separated oxygen is then collected or discharged through the negative pressure gas source. In other words, the boiler makeup water deoxygenation device in this technical solution evenly distributes water through the water distribution holes 103 of the central water pipe 1, ensuring sufficient contact between the makeup water and the membrane fiber tubes 3. The membrane fiber tubes 3 and the negative pressure gas source achieve efficient separation and purification, resulting in high functional integration, convenient maintenance, and significant advantages.

[0025] Furthermore, such as Figure 2 , Figure 3As shown, to further increase the contact between the makeup water and the membrane fiber tube 3, the boiler makeup water deoxygenation device also includes several baffles 4 disposed in the first sealing cavity 101. The inner or outer sides of the baffles 4 alternately abut against the outer wall of the central water pipe 1 or the inner wall of the shell 2, and each membrane fiber tube 3 can pass through the baffles 4. The baffles 4 can isolate the surface of the membrane fiber tube 3 into several independent areas, and the makeup water flowing out from the water distribution hole 103 flows along the channels isolated by the baffles 4. The makeup water can pass through several areas when flowing, thereby increasing the contact time and frequency between the makeup water and the membrane fiber tube 3, thereby further increasing the membrane separation deoxygenation effect.

[0026] The above, such as Figure 2 , Figure 3 As shown, the cross-section of the baffle plate 4 is corrugated to further increase the stroke of the water supply flow. At the same time, a baffle plate 401 perpendicular to the water flow direction is provided on the baffle plate 4, and the width of the baffle plate 401 is less than half the distance between two adjacent baffle plates 4, so that the water supply can maintain a turbulent state when flowing in the channel, thereby improving the deoxygenation effect.

[0027] In this embodiment, several membrane fiber tubes 3 are arranged in a circumferential array around the central water pipe 1. This ensures that during membrane treatment processes such as separation and filtration, the makeup water can evenly contact each membrane fiber tube 3, allowing each membrane fiber tube 3 to function fully. This avoids overuse of some membrane fiber tubes and underutilization of others, extending the overall service life of the membrane fiber tubes and ensuring consistent treatment results. Furthermore, several water distribution holes 103 are distributed in a circumferential array along the central water pipe 1, allowing makeup water to enter the first sealing cavity 101 evenly from all directions through the central water pipe 1. This avoids uneven water distribution leading to excessively large or small local water flows, ensuring a balanced fluid distribution within the first sealing cavity 101. This ensures consistent treatment effects in each area when subsequently contacting the membrane fiber tubes 3, improving overall treatment efficiency.

[0028] Meanwhile, the inner wall of the membrane fiber tube 3 is provided with protrusions or grooves, and the outer wall of the membrane fiber tube 3 is provided with spiral patterns to increase the contact area between the water supply and the surface of the membrane fiber tube 3.

[0029] Furthermore, in this technical solution, an oxygen content detection module is installed inside the drain outlet 201 to detect the effect of water replenishment and deoxygenation.

[0030] Working principle: The central water pipe 1 connects to the makeup water requiring deoxygenation. As the makeup water passes through the central water pipe 1, some of it enters the first sealing chamber 101 evenly from the water distribution hole 103. The baffle plate 4 in the first sealing chamber 101 isolates the surface of the membrane fiber tube 3 into several independent areas. When the makeup water flowing out of the water distribution hole 103 flows along the channels isolated by the baffle plate 4, it passes through several areas, thereby increasing the contact time and frequency between the makeup water and the membrane fiber tube 3, ensuring sufficient contact between the makeup water and several membrane fiber tubes 3. The second sealing chamber 102, connected to the negative pressure air source, creates a negative pressure area inside the membrane limiting tube, thereby separating the oxygen in the makeup water through the membrane limiting tube, and allowing the separated oxygen to be collected or discharged through the negative pressure air source.

[0031] Based on the preferred embodiments of the present invention described above, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A raw water deoxygenation device for boiler feedwater, characterized in that: It includes a central water pipe (1) and a housing (2) covering the outer periphery of the central water pipe (1); The shell (2) and the central water pipe (1) form a first sealing cavity (101) and a second sealing cavity (102). The first sealing cavity (101) is provided with a plurality of membrane fiber tubes (3) that can communicate with the second sealing cavity (102). The second sealing cavity (102) can be connected to a negative pressure air source. The central water pipe (1) is provided with a plurality of water distribution holes (103) that can communicate with the first sealing cavity (101). The housing (2) is provided with a drain outlet (201) that communicates with the first sealing cavity (101). It also includes several baffles (4) disposed in the first sealing cavity (101), the inner or outer sides of several baffles (4) are alternately attached to the outer wall of the central water pipe (1) or the inner wall of the shell (2), and each membrane fiber tube (3) can be inserted through the baffle (4). The cross-section of the spoiler disk (4) is corrugated; The turbulence plate (4) is provided with a turbulence plate (401) perpendicular to the water flow direction, and the width of the turbulence plate (401) is less than half the distance between two adjacent turbulence plates (4).

2. The boiler feedwater deaeration device according to claim 1, characterized in that: Several of the membrane fiber tubes (3) are arranged in a circular array around the central water pipe (1).

3. The boiler feedwater deaeration device according to claim 1, characterized in that: Several of the water distribution holes (103) are arranged in a circular array along the central water pipe (1).

4. The boiler feedwater deaeration device according to claim 1, characterized in that: The inner wall of the membrane fiber tube (3) is provided with protrusions or grooves, and the outer wall of the membrane fiber tube (3) is provided with spiral patterns.

5. The boiler feedwater deaeration device according to claim 1, characterized in that: An oxygen content detection module is installed inside the drain outlet (201).

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