Boiler feed water treatment device

Abstract

The utility model discloses a boiler feed water treatment device which comprises a hollow fiber membrane pipe, a vacuum connector and shells detachably installed at the two ends of the vacuum connector, a water inlet pipe is installed at the position of the shell on one side, and a water outlet pipe is installed at the position of the shell on the other side. The shell moves in the axial direction of the water inlet pipe and the water outlet pipe. The hollow fiber membrane tubes are mounted on the two end surfaces of the vacuum connector and located in the shell, and a water passing tube group is mounted through the vacuum connector; according to the device, the hollow fiber membrane tube can be directly exposed through transverse movement of the shell, so that the hollow fiber membrane tube can be conveniently maintained or replaced, and relatively convenience is provided.

Description

Technical Field

[0001] This utility model relates to a boiler feedwater treatment device. Background Technology

[0002] Boiler feedwater treatment is a crucial component of boilers, and deoxygenation is a vital part of this process. Dissolved oxygen in the water is a major cause of corrosion in the feedwater system and boiler. During steam production, dissolved oxygen corrodes components of the boiler feedwater system, generating iron oxide that enters the boiler and deposits or adheres to the inner walls and heating surfaces, forming refractory and poorly heat-conducting scale. This increases boiler energy consumption, and severe corrosion can lead to serious safety accidents such as perforation or even rupture of boiler tubes and drums. Therefore, the oxygen level in the feedwater must be controlled at a very low level.

[0003] To meet the oxygen content requirements of boiler feedwater, various technologies and equipment for removing dissolved oxygen from water have been explored. Common deoxygenation methods include thermal deoxygenation, vacuum deoxygenation, analytical deoxygenation, and iron filings deoxygenation. Among these, thermal deoxygenation is a relatively mature and widely used method. This method not only removes oxygen but also does not increase the salt content in the water and operates relatively stably. Its disadvantages include the high-level placement of the deaerator, resulting in a large foundation investment and large site requirements; at the same time, the feedwater needs to be heated to 104℃, leading to high steam consumption, high operating costs, and inconvenience to the operation of the economizer. How to combine new technologies and equipment to explore more economical and efficient deoxygenation processes from the perspective of improving new quality productivity, while ensuring the safe and stable operation of boilers and achieving the goal of cost reduction and efficiency improvement, is an important issue that the thermal power industry needs to address in the long term.

[0004] Membrane separation technology, with its simple process, no phase change during separation, room temperature operation, low energy consumption, and high efficiency, is increasingly valued and widely applied in various industries for solid / liquid, liquid / liquid, gas / liquid, and gas / gas separation. This study utilizes advanced membrane separation technology and products to research efficient deoxygenation processes and equipment for boiler feedwater using membrane technology. It leverages the air-passing but water-passing characteristic of hollow fiber membranes to achieve oxygen removal from feedwater.

[0005] Hollow fiber membranes are the most critical component in membrane degassing and deoxygenation technology. After prolonged use, hollow fiber membranes are prone to clogging. Impurities, colloidal particles, and large solute molecules in the treated water deposit on the membrane surface, causing membrane pore blockage and a decrease in deoxygenation efficiency.

[0006] In the existing technology, maintenance of hollow fiber membrane tubes requires disassembling the entire deaerator, which is very troublesome.

[0007] Based on the above problems, we designed a boiler feedwater treatment device that is highly efficient in deoxygenation and easy to maintain. Utility Model Content

[0008] The technical problem to be solved by this utility model is to provide a boiler feedwater treatment device that is highly efficient in deoxygenation and easy to maintain.

[0009] To solve the above problems, the present invention adopts the following technical solution:

[0010] A boiler feedwater treatment device includes a hollow fiber membrane tube, a vacuum connector, and a housing detachably mounted on both ends of the vacuum connector. An inlet pipe is installed on one side of the housing, and an outlet pipe is installed on the other side of the housing. The housing is axially displaced along the inlet and outlet pipes. The hollow fiber membrane tube is mounted on both ends of the vacuum connector and is located inside the housing. A water pipe assembly is installed through the vacuum connector.

[0011] Preferably, the vacuum connector includes a body with a hollow interior. Two connecting tubes are provided on the outer wall of the body, and the two connecting tubes are coaxial. Mounting holes are provided on both ends of the body, close to the outer ring of the body. The water pipe assembly is installed through the mounting holes. A first mounting hole is provided circumferentially on both ends of the body, located inside the first mounting hole. The first mounting hole is a stepped hole. A terminal is threaded into the first mounting hole, and a sealing ring is fitted between the terminal and the first mounting hole. One end of the hollow fiber membrane tube is closed, and the other end is open. The open end of the hollow fiber membrane tube is inserted into the outside of the terminal, and a seal is formed between the hollow fiber membrane tube and the terminal. The body is threaded to the outer shell, and a first sealing ring is sandwiched between the body and the outer shell. A connecting bracket is fixed on the outer wall of the body.

[0012] Preferably, the water pipe assembly includes a water pipe that passes through the mounting hole and has both ends exposed outside the body. Nuts are fitted at both ends of the water pipe, and a second sealing ring is fitted on the water pipe. After the nuts are tightened, the second sealing ring seals between the water pipe and the body, and the second sealing ring is partially embedded in the body.

[0013] Preferably, the end of the outer casing away from the main body is machined with a concave tube portion. A through hole for the water inlet pipe and water outlet pipe is provided at the axis of the concave tube portion. An internal thread is machined on the inner wall of the concave tube portion, and a nut is fitted through the internal thread. A sealing ring is embedded in the concave tube portion. The water inlet pipe and the water outlet pipe pass through the sealing ring. After the nut is screwed in, the sealing ring is compressed and elastically deformed. After the sealing ring on one side elastically deforms, it forms a seal with the concave tube portion and the water inlet pipe. After the sealing ring on the other side elastically deforms, it forms a seal with the concave tube portion and the water outlet pipe.

[0014] Preferably, one end of the water inlet pipe is inserted into the outer casing and is closed. Water outlet holes are evenly distributed on the outer wall of the water inlet pipe near the sealed end. A side branch pipe is provided on the outer wall of the water inlet pipe. A pipe cap is threadedly connected to the end of the water inlet pipe away from the sealed end. A third sealing ring is fitted between the pipe cap and the water inlet pipe. A rod is threadedly connected to the axis of the pipe cap. The end of the rod away from the pipe cap extends beyond the side branch pipe. A retaining ring is provided near the end of the rod. A filter screen is fitted on the rod. A pressure cap is threadedly connected to the end of the rod. When the pressure cap is tightened, it presses the filter screen. The outer wall of the filter screen fits against the inner wall of the water inlet pipe. The mesh size of the filter screen is 40-80 mesh.

[0015] Preferably, the end of the water outlet pipe located inside the outer casing is closed, and water inlet holes are evenly distributed on the outer wall of the water outlet pipe near the sealed end, while the end of the water outlet pipe away from the sealed end has an opening.

[0016] The beneficial effects of this utility model are:

[0017] This device allows the hollow fiber membrane tube to be directly exposed by the lateral movement of the outer casing, facilitating maintenance or replacement of the hollow fiber membrane tube and providing greater convenience.

[0018] This device uses vacuum deoxygenation, which is more efficient and suitable for widespread use. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram showing the outer casing on one side when it is open.

[0022] Figure 3 This is an exploded view of the structure of this device;

[0023] Figure 4 This is a 3D view of a vacuum connector;

[0024] Figure 5 This is a schematic diagram of the water pipe assembly installation;

[0025] Figure 6 This is a schematic diagram of the installation of hollow fiber membrane tubes;

[0026] Figure 7 This is a schematic diagram showing the fit between the outer casing and the water inlet pipe.

[0027] Figure 8 This is a magnified view of point A;

[0028] Figure 9 This is a schematic diagram of the pipe cover installation. Detailed Implementation

[0029] All features disclosed in this specification, or steps in all methods or processes disclosed herein, may be combined in any way, except for mutually exclusive features and / or steps.

[0030] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features for a similar purpose, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0031] In the description of this utility model, it should be understood that the terms "one end", "the other end", "outer side", "upper", "inner side", "horizontal", "coaxial", "center", "end", "length", "outer end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0032] Furthermore, in the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0033] In this utility model, unless otherwise explicitly specified and limited, the terms "set," "socket," "connect," "through," and "plug-in" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0034] See Figure 1 , Figure 2 and Figure 3The boiler feedwater treatment device shown includes a hollow fiber membrane tube 1, a vacuum connector 2, and a housing 3 detachably installed at both ends of the vacuum connector 2. A water inlet pipe 4 is installed at one side of the housing 3, and a water outlet pipe 5 is installed at the other side of the housing 3. The housing 3 is axially displaced along the water inlet pipe 4 and the water outlet pipe 5. The hollow fiber membrane tube 1 is installed at both ends of the vacuum connector 2 and is located inside the housing 3. A water pipe assembly 6 is installed through the vacuum connector 2.

[0035] In the above technical solution, the positions of vacuum connector 2, water inlet pipe 4 and water outlet pipe 5 are fixed, while the outer shell 3 can be opened laterally. When the outer shell 3 is opened, maintenance can be performed on the water inlet pipe 4, water outlet pipe 5, water pipe assembly 6 and hollow fiber membrane tube 1.

[0036] See Figure 4 , Figure 5 and Figure 6 As shown, the vacuum connector 2 includes a body 21, which is hollow inside. Two connecting pipes 22 are provided on the outer wall of the body 21, and the two connecting pipes 22 are coaxial. Mounting holes 23 are correspondingly provided on both end faces of the body 21, close to the outer ring of the body 21. The water pipe assembly 6 is installed through the mounting holes 23. A first mounting hole 24 is circumferentially provided on both end faces of the body 21, located inside the mounting holes 23. The first mounting hole 24 is a stepped hole. A terminal 241 is threadedly connected to the first mounting hole 24. A sealing ring 242 is fitted between the terminal 241 and the first mounting hole 24. One end of the hollow fiber membrane tube 1 is closed, and the other end is open. The open end of the hollow fiber membrane tube 1 is inserted into the outside of the terminal 241, and a seal is formed between the two ends by applying glue. The body 21 is threadedly connected to the outer shell 3, and a first sealing ring 31 is sandwiched between the body 21 and the outer shell 3. A connecting bracket 232 is fixed on the outer wall of the body 21.

[0037] In the above technical solution, when multiple devices are connected in parallel, the upper and lower vacuum connectors 2 are connected by the flange of the connecting pipe 22 to achieve docking. Then, the bottom connecting pipe 22 is sealed, and the top connecting pipe 22 is docked with the vacuum pumping equipment.

[0038] In the above technical solution, the hollow fiber membrane tube 1 can be removed for maintenance or replacement by unscrewing the terminal 241.

[0039] See Figure 5As shown, the water pipe assembly 6 includes a water pipe 61, which passes through the mounting hole 23 and has both ends exposed outside the body 21. Nuts 62 are fitted at both ends of the water pipe 61, and a second sealing ring 63 is fitted on the water pipe 61. After the nut 62 is tightened, the second sealing ring 63 seals between the water pipe 61 and the body 21, and the second sealing ring 63 is partially embedded in the body 21.

[0040] The above technical solution can achieve water passage.

[0041] See Figure 7 and Figure 8 As shown, the end of the outer shell 3 away from the main body 21 is machined with a concave tube portion 331. A through hole 332 for passing through the water inlet pipe 4 and the water outlet pipe 5 is provided at the axis of the concave tube portion 331. An internal thread is machined on the inner wall of the concave tube portion 331, and a nut 333 is fitted through the internal thread. A sealing ring 334 is embedded in the concave tube portion 331. The water inlet pipe 4 and the water outlet pipe 5 pass through the sealing ring 334. After the nut 333 is screwed in, the sealing ring 334 is compressed and elastically deformed. After the sealing ring 334 on one side elastically deforms, it forms a seal with the concave tube portion 331 and the water inlet pipe 4. After the sealing ring 334 on the other side elastically deforms, it forms a seal with the concave tube portion 331 and the water outlet pipe 5.

[0042] In the above technical solution, by tightening the nut 333, the position of the outer shell 3 relative to the water inlet pipe 4 and the water outlet pipe 5 is fixed.

[0043] After the outer shell 3 is threadedly connected to the main body 21, tightening the nut 333 can prevent the outer shell 3 from loosening.

[0044] The sealing ring 334 is compressed and deformed to ensure a tight seal and prevent water leakage from the housing 3 at the through hole 332.

[0045] When maintaining the hollow fiber membrane tube 1, the inlet pipe 4, and the outlet pipe 5, first unscrew the nut 333 to loosen the sealing ring 334. After loosening, the outer shell 3 can rotate along the inlet pipe 4 and the outlet pipe 5. Rotate the outer shell 3 until it separates from the main body 21, and then pull open the outer shell 3 to expose the hollow fiber membrane tube 1, which facilitates the maintenance of the hollow fiber membrane tube 1, as well as the maintenance of the inlet pipe 4 and the outlet pipe 5.

[0046] See Figure 7 , Figure 8 and Figure 9As shown, one end of the water inlet pipe 4 is inserted into the outer casing 3 and is closed. Water outlet holes 41 are evenly distributed on the outer wall of the water inlet pipe 4 near the sealed end. A side branch pipe 42 is provided on the outer wall of the water inlet pipe 4. A pipe cap 43 is threaded to the end of the water inlet pipe 4 away from the sealed end. A third sealing ring 44 fits between the pipe cap 43 and the water inlet pipe 4. A rod 45 is threaded to the axis of the pipe cap 43. The end of the rod 45 away from the pipe cap 43 extends beyond the side branch pipe 42. A retaining ring 46 is provided near the end of the rod 45. A filter screen 47 is fitted on the rod 45. A pressure cap 48 is threaded to the end of the rod 45. When the pressure cap 48 is tightened, it presses the filter screen 47. The outer wall of the filter screen 47 fits against the inner wall of the water inlet pipe 4. The mesh size of the filter screen 47 is 40~80 mesh.

[0047] During installation, the side branch pipe 42 is connected to the flange of the original boiler inlet pipe, so that the water in the original boiler inlet pipe first enters the inlet pipe 4 through the side branch pipe 42 and then enters the outer casing 3.

[0048] In the above technical solution, coarse particles in the water can be intercepted by the filter screen 47.

[0049] When maintenance is required on filter 47, simply unscrew cap 43 to remove filter 47, clean it, and then reinstall it.

[0050] See Figure 3 As shown, the end of the water outlet pipe 5 located inside the outer casing 3 is closed, and water inlet holes 51 are evenly distributed on the outer wall of the water outlet pipe 5 near the sealed end. The end of the water outlet pipe 5 away from the sealed end has an opening.

[0051] During installation, the open end of the outlet pipe 5 is connected to the boiler's inlet pipe flange.

[0052] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0053] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0054] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0055] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0056] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0057] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A boiler feedwater treatment device, comprising a hollow fiber membrane tube (1), characterized in that: It also includes a vacuum connector (2) and a housing (3) detachably mounted on both ends of the vacuum connector (2). A water inlet pipe (4) is installed on one side of the housing (3) and a water outlet pipe (5) is installed on the other side of the housing (3). The housing (3) is axially displaced along the water inlet pipe (4) and the water outlet pipe (5). The hollow fiber membrane tube (1) is mounted on both ends of the vacuum connector (2) and is located inside the housing (3). A water pipe assembly (6) is installed through the vacuum connector (2).

2. The boiler feedwater treatment device according to claim 1, characterized in that: The vacuum connector (2) includes a body (21), which is hollow inside. Two connecting pipes (22) are provided on the outer wall of the body (21). The two connecting pipes (22) are coaxial. Mounting holes (23) are provided at both ends of the body (21). The mounting holes (23) are close to the outer ring of the body (21). The water pipe assembly (6) is installed through the mounting holes (23). A first mounting hole (24) is provided in a ring at both ends of the body (21). The first mounting hole (24) is located inside the mounting hole (23). The first mounting hole (24) is a stepped hole. A terminal (241) is threadedly connected inside the first mounting hole (24). A sealing ring (242) is fitted between the terminal (241) and the first mounting hole (24). One end of the hollow fiber membrane tube (1) is closed, and the other end has an opening. The open end of the hollow fiber membrane tube (1) is inserted into the outside of the terminal (241), and a seal is formed between the hollow fiber membrane tube (1) and the terminal (241) by applying glue. The body (21) is threadedly connected to the outer shell (3), and a first sealing ring (31) is sandwiched between the body (21) and the outer shell (3). A connecting bracket (232) is fixed on the outer wall of the body (21).

3. The boiler feedwater treatment device according to claim 2, characterized in that: The water pipe assembly (6) includes a water pipe (61) that passes through the mounting hole (23) and has both ends exposed outside the body (21). Nuts (62) are fitted at both ends of the water pipe (61). A second sealing ring (63) is fitted on the water pipe (61). After the nut (62) is tightened, the second sealing ring (63) seals between the water pipe (61) and the body (21). The second sealing ring (63) is partially embedded in the body (21).

4. The boiler feedwater treatment device according to claim 2, characterized in that: The outer shell (3) has a recessed tube portion (331) at the end away from the main body (21). A through hole (332) for passing through the water inlet pipe (4) and the water outlet pipe (5) is provided at the axis of the recessed tube portion (331). An internal thread is processed on the inner wall of the recessed tube portion (331), and a nut (333) is fitted through the internal thread. A sealing ring (334) is embedded in the recessed tube portion (331). The water inlet pipe (4) and the water outlet pipe (5) pass through the sealing ring (334). After the nut (333) is screwed in, the sealing ring (334) is elastically deformed under pressure. After the sealing ring (334) on one side is elastically deformed, it forms a seal with the recessed tube portion (331) and the water inlet pipe (4). After the sealing ring (334) on the other side is elastically deformed, it forms a seal with the recessed tube portion (331) and the water outlet pipe (5).

5. The boiler feedwater treatment device according to claim 4, characterized in that: One end of the water inlet pipe (4) is inserted into the outer casing (3) and is closed. Water outlet holes (41) are evenly distributed on the outer wall of the water inlet pipe (4) near the sealed end. A side branch pipe (42) is provided on the outer wall of the water inlet pipe (4). A pipe cap (43) is threaded to the end of the water inlet pipe (4) away from the sealed end. A third sealing ring (44) fits between the pipe cap (43) and the water inlet pipe (4). A rod (45) is threaded to the axis of the pipe cap (43). 5) The end away from the pipe cover (43) extends beyond the side branch pipe (42). A retaining ring (46) is provided near the end of the rod (45). A filter screen (47) is fitted on the rod (45). A pressure cap (48) is threaded to the end of the rod (45). After the pressure cap (48) is tightened, it presses the filter screen (47). The outer wall of the filter screen (47) is attached to the inner wall of the water inlet pipe (4). The mesh size of the filter screen (47) is 40~80 mesh.

6. The boiler feedwater treatment device according to claim 4, characterized in that: The end of the water outlet pipe (5) located inside the outer casing (3) is closed. Water inlet holes (51) are evenly distributed on the outer wall of the water outlet pipe (5) near the sealed end. The end of the water outlet pipe (5) away from the sealed end has an opening.

Images