Boiler feed water deoxidation system

Abstract

The utility model provides a boiler feed water deoxidation system, which is provided with a gas purging flow path, a vacuum pumping flow path, and a water inlet flow path, a deoxidation flow path and a drainage flow path which are communicated in sequence, and comprises a plurality of deoxidation filters which are arranged on the deoxidation flow path in sequence, the gas purging flow path is communicated with any one of the deoxidation filters, and the vacuum pumping flow path is communicated with any one of the deoxidation filters. By the adoption of the scheme, the interior of the deoxidation flow path is cleaned through gas purging and vacuum pumping, the situation that the deoxidation effect and performance of the deoxidation filter are affected by residual soluble gas in the deoxidation flow path is avoided, meanwhile, the cleaning efficiency of the deoxidation flow path can be improved through cooperation of gas purging and vacuum pumping, and the deoxidation effect of the deoxidation filter is improved. The cleaning time is shortened; and the consumption of energy sources such as purging gas is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of boiler feed water, in particular to a boiler feed water deoxidation system. Background Art

[0002] During methanol production, boiler feed water is supplied by the desalination system, which removes oxygen through a deaerator before supplying it to the boiler. However, existing deaeration systems fail to promptly clean the deaeration flow path, allowing dissolved oxygen to accumulate, impacting the subsequent deaeration process and potentially harming the boiler. Utility Model Content

[0003] The utility model provides a boiler feed water deoxidation system to solve the problem that the deoxidation system in the prior art cannot clean the inside of the deoxidation flow path in time.

[0004] In order to solve the above problems, the utility model provides a boiler feed water deoxygenation system, which has a gas purge flow path, a vacuum exhaust flow path, and a water inlet flow path, a deoxygenation flow path and a drainage flow path connected in sequence. The boiler feed water deoxygenation system includes multiple deoxygenation filters arranged in sequence on the deoxygenation flow path, the gas purge flow path is connected to any one of the deoxygenation filters, and the vacuum exhaust flow path is connected to any one of the deoxygenation filters.

[0005] Furthermore, the gas purge flow path includes a first collecting section and multiple first diversion sections all connected to the first collecting section. The multiple first diversion sections are connected to multiple deoxygenation filters in a one-to-one correspondence. The boiler feed water deoxygenation system also includes a first switch valve, a first pressure sensor, a first flow meter and a flow regulating valve. The direction of the first diversion section toward the first collecting section is the purge direction. The flow regulating valve, the first pressure sensor, the first flow meter and the first switch valve are sequentially arranged on the first collecting section along the purge direction.

[0006] Furthermore, the vacuum exhaust flow path includes a second collecting section and multiple second diversion sections all connected to the second collecting section. The multiple second diversion sections are connected to multiple deoxygenation filters in a one-to-one correspondence. The boiler feed water deoxygenation system also includes a second pressure sensor, an emptying flow path and a vacuum pump. The direction from the second collecting section toward the second diversion section is the vacuum exhaust direction. The second pressure sensor, the emptying flow path and the vacuum pump are sequentially arranged on the second collecting section along the vacuum exhaust direction.

[0007] Furthermore, the boiler feed water deoxygenation system further includes a gas-liquid separator, which is arranged at the outlet side of the vacuum pump.

[0008] Furthermore, the deoxygenation filter includes a shell and hollow fiber membrane yarns, the shell has a water inlet chamber and a drainage chamber spaced apart from each other, and the water inlet chamber and the drainage chamber are respectively provided with a water inlet and a drainage port at one end facing away from each other. The deoxygenation filter also has a transfer chamber for connecting the water inlet chamber and the drainage chamber, and hollow fiber membrane yarns are provided in both the water inlet chamber and the drainage chamber.

[0009] Furthermore, the deoxygenation filter also includes a central water pipe passing through the shell and a baffle arranged in the shell. The baffle is arranged at the center of the shell cavity and divides the cavity in the shell into a water inlet chamber and a drainage chamber. The central water pipe and the hollow fiber membrane both pass through the baffle. The outer periphery of the central water pipe located in the water inlet chamber has multiple water inlet holes, and the outer periphery of the central water pipe located in the drainage chamber has multiple drainage holes. The water inlet chamber and the drainage chamber are connected through the multiple water inlet holes, the cavity of the central water pipe and the multiple drainage holes.

[0010] Furthermore, in the direction from the water inlet toward the drain outlet, the radial sizes of the multiple water inlet holes increase sequentially, and the radial sizes of the multiple drain holes decrease sequentially.

[0011] Furthermore, the boiler feed water deoxygenation system further includes a second on-off valve, a third pressure sensor and a second flow meter which are sequentially arranged on the water inlet flow path along the water inlet direction.

[0012] Furthermore, the boiler feed water deoxygenation system further includes a third switch valve and a fourth pressure sensor which are sequentially arranged in the drainage flow path along the drainage direction.

[0013] Furthermore, any one of the deoxidation filters has an exhaust flow path, an exhaust valve is provided on the exhaust flow path, and the exhaust flow path is used to discharge the gas in the deoxidation filter.

[0014] By applying the technical solution of the present utility model, a boiler feed water deoxygenation system is provided. The boiler feed water deoxygenation system has a gas purge flow path, a vacuum exhaust flow path, and a water inlet flow path, a deoxygenation flow path and a drainage flow path connected in sequence. The boiler feed water deoxygenation system includes multiple deoxygenation filters arranged in sequence on the deoxygenation flow path, the gas purge flow path is connected to any one of the deoxygenation filters, and the vacuum exhaust flow path is connected to any one of the deoxygenation filters.

[0015] By the scheme, the deoxidized fluid is from the water inlet flow path into the deoxidized flow path, and after deoxidation by the plurality of deoxidized filters, the deoxidized fluid is discharged from the water outlet flow path, and in the deoxidation process, the dissolved gas is generated, the plurality of deoxidized filters are purged through the gas purging flow path, the purging gas drives the dissolved gas to flow together and is discharged from the deoxidized flow path and the vacuum air extraction flow path under the negative pressure of the vacuum air extraction, and the deoxidized fluid is used for the boiler. In this way, the deoxidized flow path is cleaned by the gas purging and the vacuum air extraction, the deoxidized flow path is prevented from having the dissolved gas remaining to affect the deoxidation effect and performance of the deoxidized filter, meanwhile, the cleaning efficiency of the deoxidized flow path is improved by the cooperation of the gas purging and the vacuum air extraction, the cleaning time is reduced, and the consumption of the purging gas and other energy is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0016] The drawings accompanying the specification of this application form a part thereof, serve to provide further understanding of the present application, and together with the description provide a basis for the understanding of the present application. The illustrative embodiments of the present application and its description serve to explain the application. In the drawings:

[0017] Figure 1 A structure schematic diagram of the boiler feed water deoxidation system is shown.

[0018] Figure 2 A structure schematic diagram of the deoxidized filter in the boiler feed water deoxidation system is shown. Figure 1

[0019] An assembly schematic diagram of the baffle and the central water pipe in the deoxidized filter is shown. Figure 3 Figure 2 The above drawings include the following reference signs:

[0020] The above drawings include the following reference signs:

[0021] 101, gas purging flow path; 1011, first flow collecting section; 1012, first flow dividing section;

[0022] 102, vacuum air extraction flow path; 1021, second flow collecting section; 1022, second flow dividing section;

[0023] 103, water inlet flow path;

[0024] 104, deoxidized flow path;

[0025] 105, water outlet flow path;

[0026] 106, emptying flow path;

[0027] 107, exhaust flow path;

[0028] ​20. Deoxygenation filter; 21. Housing; 211. Water inlet chamber; 212. Drain chamber; 213. Water inlet; 214. Drain; 215. Air inlet; 216. Air outlet; 22. Hollow fiber membrane; 23. Central water pipe; 231. Water inlet hole; 232. Drain hole; 233. Adapter chamber; 24. Baffle;

[0029] 31. First switch valve; 32. Second switch valve; 33. Third switch valve;

[0030] 41. First pressure sensor; 42. Second pressure sensor; 43. Third pressure sensor; 44. Fourth pressure sensor;

[0031] 51. First flow meter; 52. Second flow meter;

[0032] 61. Flow control valve;

[0033] 71. Vacuum pump;

[0034] 81. Exhaust valve. DETAILED DESCRIPTION

[0035] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way serves as any limitation on the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

[0036] like Figures 1 to 3 As shown, an embodiment of the present invention provides a boiler feed water deoxygenation system, which has a gas purge flow path 101, a vacuum exhaust flow path 102, and a water inlet flow path 103, a deoxygenation flow path 104 and a drainage flow path 105 connected in sequence. The boiler feed water deoxygenation system includes a plurality of deoxygenation filters 20 arranged in sequence on the deoxygenation flow path 104, the gas purge flow path 101 is connected to any one of the deoxygenation filters 20, and the vacuum exhaust flow path 102 is connected to any one of the deoxygenation filters 20.

[0037] In this embodiment, the fluid to be deoxygenated enters the deoxygenation flow path 104 from the water inlet flow path 103 and is deoxygenated after passing through multiple deoxygenation filters 20 and then discharged from the water outlet flow path 105. Dissolved gas is generated during this deoxygenation process. The multiple deoxygenation filters 20 are purged via the gas purge flow path 101. The purge gas drives the dissolved gas along with the flow and is discharged from the deoxygenation flow path 104 and the vacuum pumping flow path 102 under the negative pressure of vacuum pumping. The discharged deoxygenated fluid is then used in the boiler. This arrangement allows the deoxygenation flow path 104 to be cleaned through gas purge and vacuum pumping, preventing residual dissolved gas in the deoxygenation flow path 104 from affecting the deoxygenation effect and performance of the deoxygenation filters 20. Furthermore, the combined effects of gas purge and vacuum pumping improve the cleaning efficiency of the deoxygenation flow path 104, reduce cleaning time, and reduce energy consumption, such as purge gas.

[0038] Specifically, the purge gas supplied to gas purge flow path 101 is high-purity nitrogen (99.99%). Only a small amount of high-purity nitrogen is required to purge multiple deoxygenation filters 20. Water inlet flow path 103 communicates with the desalted water system to supply highly oxygenated desalted water to the boiler feedwater deoxygenation system. Desalted water, after deoxygenation by the boiler feedwater deoxygenation system, is then supplied to the boiler.

[0039] like Figure 1 As shown, the gas purge flow path 101 includes a first collecting section 1011 and a plurality of first diversion sections 1012 all connected to the first collecting section 1011. The plurality of first diversion sections 1012 are connected to a plurality of deoxygenation filters 20 in a one-to-one correspondence. The boiler feed water deoxygenation system also includes a first switch valve 31, a first pressure sensor 41, a first flow meter 51 and a flow regulating valve 61. The direction of the first diversion section 1012 toward the first collecting section 1011 is the purge direction. The flow regulating valve 61, the first pressure sensor 41, the first flow meter 51 and the first switch valve 31 are sequentially arranged on the first collecting section 1011 along the purge direction.

[0040] In the embodiment, the deoxidizing filter 20 has an air inlet 215, the plurality of first sub-flow sections 1012 communicate with the plurality of air inlets 215 of the plurality of deoxidizing filters 20 one by one, the purge gas enters the plurality of first sub-flow sections 1012 from the first flow collecting section 1011 and is branched to purge the plurality of deoxidizing filters 20 respectively, the operator can detect the gas flow entering the first flow collecting section 1011 through the first flow meter 51 and detect the fluid pressure flowing through the first flow collecting section 1011 through the first pressure sensor 41, further, the operator can accurately adjust the gas flow and gas pressure of the external device entering the first flow collecting section 1011 by adjusting the flow regulating valve 61, which improves the convenience of adjustment and is beneficial to ensure the reliability of the gas purging flow path 101, and the first on-off valve 31 is used to control the connection and disconnection of the first flow collecting section 1011 and the plurality of first sub-flow sections 1012. In this way, the operator can reasonably control the amount of high-purity nitrogen entering the plurality of deoxidizing filters 20 according to the deoxidizing amount (i.e. the difference between the oxygen content of the fluid discharged from the water draining flow path 105 and the oxygen content of the fluid entering from the water feeding flow path 103), which avoids resource waste while ensuring the gas purging effect, and facilitates the operator to monitor and maintain.

[0041] Specifically, the vacuum air flow path 102 includes a second flow collecting section 1021 and a plurality of second sub-flow sections 1022 each communicating with the second flow collecting section 1021, the plurality of second sub-flow sections 1022 communicate with the plurality of deoxidizing filters 20 one by one, the boiler feed water deoxidizing system further includes a second pressure sensor 42, a emptying flow path 106 and a vacuum pump 71, the direction of the second flow collecting section 1021 towards the second sub-flow section 1022 is the vacuumizing direction, the second pressure sensor 42, the emptying flow path 106 and the vacuum pump 71 are sequentially arranged on the second flow collecting section 1021 along the vacuumizing direction.

[0042] In the embodiment, the deoxidizing filter 20 has an air inlet 215, the plurality of first sub-flow sections 1012 communicate with the plurality of air inlets 215 of the plurality of deoxidizing filters 20 one by one, the purge gas enters the plurality of first sub-flow sections 1012 from the first flow collecting section 1011 and is branched to purge the plurality of deoxidizing filters 20 respectively, the operator can detect the gas flow entering the first flow collecting section 1011 through the first flow meter 51 and detect the fluid pressure flowing through the first flow collecting section 1011 through the first pressure sensor 41, further, the operator can accurately adjust the gas flow and gas pressure of the external device entering the first flow collecting section 1011 by adjusting the flow regulating valve 61, which improves the convenience of adjustment and is beneficial to ensure the reliability of the gas purging flow path 101, and the first on-off valve 31 is used to control the connection and disconnection of the first flow collecting section 1011 and the plurality of first sub-flow sections 1012. In this way, the operator can reasonably control the amount of high-purity nitrogen entering the plurality of deoxidizing filters 20 according to the deoxidizing amount (i.e. the difference between the oxygen content of the fluid discharged from the water draining flow path 105 and the oxygen content of the fluid entering from the water feeding flow path 103), which avoids resource waste while ensuring the gas purging effect, and facilitates the operator to monitor and maintain.

[0043] Preferably, the boiler feedwater deoxygenation system also includes a gas-liquid separator, which is disposed on the outlet side of the vacuum pump 71. This arrangement allows the gas-liquid separator to separate the exhaust fluid into gas and liquid, thereby separating excess water from the gas extracted from the deoxygenation filter 20. It will be appreciated that the discharged water and gas are clean and pollution-free, with the gas discharged into the surrounding atmosphere and the excess water discharged into the sewer.

[0044] Preferably, the vacuum pump 71 in this embodiment is a water ring vacuum pump, which needs to be supplemented with a certain amount of cooling water.

[0045] like Figures 1 to 3 As shown, the deoxygenation filter 20 includes a shell 21 and a hollow fiber membrane filament 22. The shell 21 has a water inlet chamber 211 and a drainage chamber 212 spaced apart from each other. The water inlet chamber 211 and the drainage chamber 212 are respectively provided with a water inlet 213 and a drainage outlet 214 at one end facing away from each other. The deoxygenation filter 20 also has a transfer chamber 233 for connecting the water inlet chamber 211 and the drainage chamber 212. Hollow fiber membrane filaments 22 are provided in both the water inlet chamber 211 and the drainage chamber 212.

[0046] In this embodiment, the fluid flowing in from the water inlet flow path 103 enters the water inlet chamber 211 and contacts the hollow fiber membrane filaments 22 inside the water inlet chamber 211 before being deoxygenated. The fluid then enters the drainage chamber 212 from the water inlet chamber 211 through the adapter chamber 233, where it contacts the hollow fiber membrane filaments 22 inside the drainage chamber 212 and is deoxygenated again. This arrangement effectively reduces the dissolved oxygen in the desalted water supplied to the boiler, thereby effectively reducing oxygen corrosion of the desalted water to the boiler, reducing the corrosion of the boiler equipment by dissolved oxygen in the feed water, thereby reducing the frequency of boiler pipe bursts due to oxygen corrosion and improving the safety of boiler operation.

[0047] Specifically, the deoxygenation filter 20 also includes a central water pipe 23 passing through the shell 21 and a baffle 24 arranged in the shell 21. The baffle 24 is arranged at the center of the cavity of the shell 21 and divides the cavity in the shell 21 into an inlet cavity 211 and a drainage cavity 212. The central water pipe 23 and the hollow fiber membrane 22 both pass through the baffle 24. The outer periphery of the central water pipe 23 located in the water inlet cavity 211 has a plurality of water inlet holes 231, and the outer periphery of the central water pipe 23 located in the drainage cavity 212 has a plurality of drainage holes 232. The water inlet cavity 211 and the drainage cavity 212 are connected through the plurality of water inlet holes 231, the cavity of the central water pipe 23 and the plurality of drainage holes 232, and the cavity of the central water pipe 23 forms a transfer cavity 233.

[0048] In the embodiment, the desalted water in the water inlet cavity 211 enters the adapter cavity 233 from the plurality of water inlet holes 231 of the central water pipe 23 and flows into one side of the water outlet cavity 212, and then the desalted water fills into the water outlet cavity 212 from the plurality of water outlet holes 232 and is deoxidized again. In this way, the cavity of the shell 21 is divided into two parts by the baffle, and the desalted water can be deoxidized in both cavities, which is beneficial to improve the sufficiency and effect of deoxidization.

[0049] As shown in Figure 3 , in the direction from the water inlet 213 to the water outlet 214, the radial sizes of the plurality of water inlet holes 231 gradually increase, and the radial sizes of the plurality of water outlet holes 232 gradually decrease.

[0050] In this way, the part close to the center area of the cavity of the shell 21 has a larger flow area of the cavity of the central water pipe 23, and the flow path is optimized, which avoids the situation that the desalted water directly enters the water inlet hole 231 without being deoxidized after entering the water inlet cavity 211, ensures the reliability of the hollow fiber membrane 22 in the water inlet cavity 211 for deoxidizing the desalted water, and the design reason of the water outlet hole 232 is the same, which is beneficial to reduce the situation that the desalted water directly flows out from the end water outlet hole 232 without being deoxidized or incompletely deoxidized after entering the water outlet cavity 212 of the central water pipe 23, ensures the reliability of deoxidizing the desalted water, and improves the deoxidization efficiency.

[0051] As shown in Figure 1 , the boiler feed water deoxidization system further comprises a second switch valve 32, a third pressure sensor 43 and a second flow meter 52 which are sequentially arranged on the water inlet flow path 103 in the water inlet direction.

[0052] In this way, the second switch valve 32 is used to control the opening and closing of the water inlet flow path 103 and the desalted water supply flow path, the third pressure sensor 43 and the second flow meter 52 are used to detect the pressure and flow of the desalted water flowing through the water inlet flow path 103, which is convenient for the operator to accurately control the water inlet flow and pressure according to the actual needs, and is convenient for the operator to monitor and maintain.

[0053] Specifically, the boiler feed water deoxidization system further comprises a third switch valve 33 and a fourth pressure sensor 44 which are sequentially arranged on the water outlet flow path 105 in the water outlet direction.

[0054] In this way, the third switch valve 33 is used to control the opening and closing of the water outlet flow path 105 and the external environment, and the fourth pressure sensor 44 is used to detect the pressure of the desalted water flowing through the water outlet flow path 105, which is convenient for the operator to monitor and maintain.

[0055] Furthermore, each deoxidation filter 20 has an exhaust flow path 107 equipped with an exhaust valve 81. Exhaust flow path 107 is used to exhaust gas from the deoxidation filter 20. This configuration can assist in exhausting gas from the deoxidation flow path 104 and also assist in purging and vacuuming. Preferably, the deoxidation flow path 104 between any two adjacent deoxidation filters 20 also has an exhaust flow path 107 equipped with an exhaust valve 81, which can be opened and assisted in exhaust according to actual conditions.

[0056] Preferably, there are three deoxygenation filters 20 in this embodiment, and the boiler feed water deoxygenation system also includes a control module, which is electrically connected to the first switch valve 31, the second switch valve 32, the third switch valve 33, the first pressure sensor 41, the second pressure sensor 42, the third pressure sensor 43, the fourth pressure sensor 44, the first flow meter 51, the second flow meter 52, the flow regulating valve 61, the vacuum pump 71, and the exhaust valve 81 to facilitate semi-automatic control of multiple flow paths.

[0057] In summary, the present invention provides a boiler feed water deoxygenation system, whose water inlet flow path 103 is connected to the desalted water system. The desalted water provided by the desalted water system to the boiler first flows through the boiler feed water deoxygenation system for deoxygenation, and the desalted water entering the water inlet flow path 103 flows downstream to the deoxygenation flow path 104 and passes through three deoxygenation filters 20 in sequence for three-stage filtration and deoxygenation. For any deoxygenation filter 20, the desalted water first contacts with the hollow fiber membrane filament 22 in its water inlet cavity 211 and undergoes a first deoxygenation, and then enters the drainage cavity 212 through multiple water inlet holes 231, the transfer cavity 233 and multiple drainage holes 232 on the central water pipe 23 for a second deoxygenation. After the three-stage filtration and deoxygenation, the dissolved oxygen content of the desalted water is removed to the required level, the water pressure will be reduced by 0.1~0.3MPaG, and finally discharged from the drainage flow path 105. High-purity nitrogen is then blown into the first collecting section 1011 of the gas purge flow path 101 and enters the three deoxidation filters 20 through the three first diverter sections 1012, thereby purging the entire deoxidation flow path 104. The high-purity nitrogen drives all the dissolved gases, such as nitrogen, oxygen, and carbon dioxide, removed from the water to flow together and, under the action of the vacuum pump 71, are uniformly discharged from the three second diverter sections 1022 and converge into the second collecting section 1021 for unified discharge. This arrangement cleans the interior of the deoxidation flow path 104 through gas purging and vacuum extraction, preventing the presence of residual dissolved gases in the deoxidation flow path 104 from affecting the deoxidation effect and performance of the deoxidation filters 20.

[0058] The above merely describes preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

[0059] It is to be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0060] The relative arrangement of parts and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless otherwise specifically indicated. At the same time, it should be understood that the sizes of the various parts shown in the drawings are not drawn in accordance with the actual proportional relationship. The technology, methods and devices known to those skilled in the related art can not be discussed in detail, but under appropriate circumstances, the technology, methods and devices should be considered as part of the authorized description. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0061] In the description of the present application, it should be understood that the orientation words such as "front, rear, upper, lower, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and these orientation words do not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the protection scope of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0062] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0063] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

Claims

1. A boiler feed water deoxygenation system, characterized in that: The boiler feed water deoxygenation system comprises a gas purge flow path (101), a vacuum extraction flow path (102), and a water inlet flow path (103), a deoxygenation flow path (104), and a drainage flow path (105) that are sequentially connected. The boiler feed water deoxygenation system comprises a plurality of deoxygenation filters (20) that are sequentially arranged on the deoxygenation flow path (104). The gas purge flow path (101) is connected to any one of the deoxygenation filters (20), and the vacuum extraction flow path (102) is connected to any one of the deoxygenation filters (20).

2. The boiler feed water deoxygenation system according to claim 1, characterized in that: The gas purge flow path (101) comprises a first collecting section (1011) and a plurality of first diverter sections (1012) each connected to the first collecting section (1011); the plurality of first diverter sections (1012) are connected to the plurality of deoxidation filters (20) in a one-to-one correspondence; the boiler feed water deoxidation system further comprises a first switch valve (31), a first pressure sensor (41), a first flow meter (51) and a flow regulating valve (61); the direction of the first diverter section (1012) toward the first collecting section (1011) is a purge direction; the flow regulating valve (61), the first pressure sensor (41), the first flow meter (51) and the first switch valve (31) are sequentially arranged on the first collecting section (1011) along the purge direction.

3. The boiler feed water deoxygenation system according to claim 1, characterized in that: The vacuum exhaust flow path (102) comprises a second collecting section (1021) and a plurality of second diverting sections (1022) each connected to the second collecting section (1021); the plurality of second diverting sections (1022) are connected to the plurality of deoxidation filters (20) in a one-to-one correspondence; the boiler feed water deoxidation system further comprises a second pressure sensor (42), an exhaust flow path (106) and a vacuum pump (71); the direction from the second collecting section (1021) toward the second diverting section (1022) is a vacuum exhaust direction; the second pressure sensor (42), the exhaust flow path (106) and the vacuum pump (71) are sequentially arranged on the second collecting section (1021) along the vacuum exhaust direction.

4. The boiler feed water deoxygenation system according to claim 3, characterized in that: The boiler feed water deoxygenation system further comprises a gas-liquid separator, which is arranged at the outlet side of the vacuum pump (71).

5. The boiler feed water deoxygenation system according to claim 1, characterized in that: The deoxygenation filter (20) comprises a shell (21) and hollow fiber membranes (22); the shell (21) comprises a water inlet chamber (211) and a drainage chamber (212) spaced apart from each other; a water inlet (213) and a drainage chamber (214) are respectively provided at ends of the water inlet chamber (211) and the drainage chamber (212) facing away from each other; the deoxygenation filter (20) further comprises a transfer chamber (233) for connecting the water inlet chamber (211) and the drainage chamber (212); the hollow fiber membranes (22) are both provided in the water inlet chamber (211) and the drainage chamber (212).

6. The boiler feed water deoxygenation system according to claim 5, characterized in that: The deoxygenation filter (20) further comprises a central water pipe (23) passing through the shell (21) and a baffle (24) disposed in the shell (21); the baffle (24) is disposed at the center of the shell (21) cavity and divides the cavity in the shell (21) into the water inlet cavity (211) and the drainage cavity (212); the central water pipe (23) and the hollow fiber membrane (22) both pass through the baffle (24) and are located in the water inlet cavity. The outer periphery of the central water pipe (23) in (211) has a plurality of water inlet holes (231), and the outer periphery of the central water pipe (23) in the drainage cavity (212) has a plurality of drainage holes (232). The water inlet cavity (211) and the drainage cavity (212) are connected through the plurality of water inlet holes (231), the cavity of the central water pipe (23) and the plurality of drainage holes (232), and the cavity of the central water pipe (23) forms the transfer cavity (233).

7. The boiler feed water deoxygenation system according to claim 6, characterized in that: In the direction from the water inlet (213) toward the drain outlet (214), the radial dimensions of the plurality of water inlet holes (231) increase sequentially, and the radial dimensions of the plurality of drain holes (232) decrease sequentially.

8. The boiler feed water deoxygenation system according to claim 1, characterized in that: The boiler feed water deoxygenation system further comprises a second on-off valve (32), a third pressure sensor (43) and a second flow meter (52) which are sequentially arranged on the water inlet flow path (103) along the water inlet direction.

9. The boiler feed water deoxygenation system according to claim 1, characterized in that: The boiler feed water deoxygenation system further includes a third switch valve (33) and a fourth pressure sensor (44) which are sequentially arranged in the drainage flow path (105) along the drainage direction.

10. The boiler feed water deoxygenation system according to claim 1, characterized in that: Any of the deoxidation filters (20) has an exhaust flow path (107), an exhaust valve (81) is provided on the exhaust flow path (107), and the exhaust flow path (107) is used to discharge the gas in the deoxidation filter (20).

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