Integrated deoxidizing system for thermal power plant

Abstract

The invention discloses an integrated deoxidizing system for a thermal power plant, and relates to the technical field of thermal deoxidizing equipment, the integrated deoxidizing system comprises a water tank and a deoxidizing head fixed at the top of the water tank, a water inlet pipe is arranged at the top of the deoxidizing head, a spray head communicated with the water inlet pipe is arranged in the deoxidizing head, and a filter assembly is arranged between the water inlet pipe and the spray head. Through the arrangement of the first communicating pipe, the second communicating pipe, the filter, the backwashing assembly and the like, after the filtering precision of the front filtering equipment is reduced, the deoxidizing head has an emergency means for filtering liquid, the blockage of the spray head is improved and even avoided, and a user can reduce the filtering precision of the front filtering device according to the use cost; and meanwhile, the filter has a backwashing effect, so that even if the filter is blocked, a worker does not need to detach the deoxidizing head to clean the filter element, and the labor capacity of the worker is further reduced.

Description

Technical Field

[0001] The invention relates to the technical field of thermal deoxidation equipment, and in particular to an integrated deoxidation system for a thermal power plant. Background Art

[0002] Thermal deaerator is a new type of deoxygenation device, which can remove dissolved oxygen and other gases in the feed water of thermal system and prevent corrosion of thermal equipment. It is an important equipment to ensure the safe operation of power plants and industrial boilers.

[0003] Spray water disc deaerator is widely used in thermal power plants due to its simple structure and low cost. However, it has high requirements on water quality. If the raw water is not filtered, the impurities in the water will clog and damage the nozzle. The existing treatment method is to add pretreatment equipment at the front end of the demister, such as a water softener, a pre-filter, etc.

[0004] The Chinese patent with application number CN202311134965.5 discloses a thermal deaerator and boiler heating system. By setting a water storage space on the upper part of the deaerator box, the contact time between steam and water can be increased, and the deoxygenation effect can be improved; with the help of the gravity of the water in the water storage space, the filter plate can be simply cleaned and the blockage of the filter plate can be improved. However, the invention does not set a filtering device in the demister head, and still adopts the pre-filtration method, which is often accompanied by an increase in cost, and when the filtering accuracy of the pre-filtering equipment decreases, the demister does not have a corresponding emergency filtering device. When the nozzle is blocked, the worker needs to remove the demister head, which is very troublesome.

[0005] At the same time, when the spray water disc demister is running at low load, the atomization effect of the liquid becomes worse and the deoxygenation efficiency decreases due to the decrease in flow rate in the water inlet pipe and the decrease in liquid pressure.

[0006] To this end, the present invention proposes an integrated deoxidation system for a thermal power plant to solve the above problems. Summary of the invention

[0007] The object of the present invention is to provide an integrated deoxidation system for a thermal power plant to solve the technical problems mentioned in the above background technology that the existing deoxidizer has no filtering function and the flow rate is insufficient when the equipment is running at low load, resulting in poor atomization effect.

[0008] To achieve the above object, the present invention provides the following technical solution: an integrated deoxidation system for a thermal power plant, comprising a water tank and a deoxidation head fixed to the top of the water tank, a water inlet pipe being arranged on the top of the deoxidation head, a nozzle connected to the water inlet pipe being arranged inside the deoxidation head, and a filter assembly being arranged between the water inlet pipe and the nozzle;

[0009] The filter assembly comprises two filters arranged adjacent to each other, a first connecting pipe and a second connecting pipe are respectively arranged between the water inlet pipe and the two filters and between the nozzle and the two filters, a switching assembly is arranged between the first connecting pipe, the second connecting pipe and the two filters, and when one of the filters is clogged, the switching assembly can connect the other filter with the nozzle;

[0010] The filter comprises a shell with a cavity formed in the shell, a filter element is arranged in the cavity, the filter element divides the cavity into an inner cavity and an outer cavity, a water inlet connected to the outer cavity and a water outlet connected to the inner cavity are respectively arranged at two ends of the shell, and backwashing components that cooperate with each other are arranged in the outer cavity and the inner cavity.

[0011] Preferably, the backwashing assembly includes a pressure plate that is sealed and slides in the outer cavity, a first elastic member is arranged between the pressure plate and the shell, a connecting shaft is rotatably connected to the filter element, a rotating paddle is coaxially fixed to one end of the connecting shaft that passes through the inner cavity, a spiral track is provided on the circumferential side of the connecting shaft located at one end of the outer cavity, a connecting plate is slidably connected to the connecting shaft, a connecting block that meshes with the spiral track is arranged on the connecting plate, and a plurality of connecting rods uniformly distributed around the circumference are arranged between the connecting plate and the pressure plate;

[0012] A limiting piece is arranged on the inner wall of the shell and is located on one side of the first elastic piece. After the pressure plate breaks through the restriction of the limiting piece, the pressure in the outer cavity is instantly reduced and the rotating paddle is rotated.

[0013] Preferably, the switching assembly includes two rotating balls respectively located in the first connecting tube and the second connecting tube, the rotating ball is provided with three through holes connected to each other, and the axial angle between two adjacent through holes is 90 degrees, and a pin shaft penetrating the first connecting tube and the second connecting tube is arranged on the top of the rotating ball, a transmission rod is fixedly connected between the two pin shafts, and a transmission gear is coaxially fixed on the pin shaft rotatably connected to the second connecting tube, a connecting tube connected to the outer cavity is fixedly connected to the shells of the two filters, a piston rod is sealingly and slidably connected in the connecting tube, an end of the piston rod away from the connecting tube is fixedly connected to the pressure plate, and a sliding rod is sealingly and slidably provided at the end of the connecting tube away from the pressure plate, and a rack meshing with the transmission gear is fixedly connected between the two sliding rods.

[0014] Preferably, the nozzle comprises a shell, an outer flow channel and an inner flow channel are arranged in the shell, an atomization outlet communicating with the inner flow channel is arranged at one end of the shell away from the second connecting pipe, and a pressure regulating member is arranged on one side of the shell;

[0015] The second connecting tube and the inner flow channel are provided with flow compensation components that cooperate with each other. When the flow in the nozzle decreases, the flow compensation component can send the liquid in the second connecting tube to the inner flow channel of the nozzle and increase the liquid flow rate in the inner flow channel.

[0016] Preferably, the flow compensation component includes a lifting plate arranged in the second connecting pipe, the lifting plate is provided with a plurality of filter holes, the inner wall of the second connecting pipe is provided with two symmetrically distributed lifting grooves, a second elastic member fixedly connected to the lifting plate is provided in the lifting groove, a side tube is provided on the side wall of the second connecting pipe, a reducing cylinder is fixedly connected to the inner wall of the inner flow channel, an external joint connected to the middle part of the reducing cylinder is provided on the side wall of the outer shell, the external joint is connected to the side tube through a pipeline, an arc-shaped sheet is fixedly connected to the circumferential side of the lifting plate, and when the lifting plate is at different heights, the arc-shaped sheet has different blocking areas for the side tube.

[0017] Preferably, the filter element includes a support frame and a filter screen, a collecting chamber is formed between the support frame and the shell, the pressure plate is an annular structure and is coaxially sleeved on the outside of the support frame, the circumferential side of the support frame is provided with a plurality of circumferentially evenly distributed notches, one end of the shell near the water outlet is fixedly connected to a collecting box, the collecting box is communicated with the collecting chamber, a discharge port is provided on one side of the collecting box, and the discharge port is externally connected to a pressure extraction device.

[0018] Preferably, the pressure-bearing surface of the pressure plate is an inclined surface and has an inner conical structure. In the initial state of the pressure plate, the lowest point of the pressure plate is consistent with the lowest point of the notch.

[0019] Preferably, the rotating paddle comprises a connecting column fixed coaxially with the connecting shaft, and a plurality of blades evenly distributed around the circumference are fixedly connected to the circumferential side of the connecting column.

[0020] Preferably, both ends of the reducer are inner conical structures, and a connecting hole communicating with the external joint is provided in the middle of the reducer.

[0021] Preferably, the pressure regulating member includes a knob, a piston column that slides laterally is coaxially arranged inside the knob, a third elastic member is arranged between the piston column and the knob, an elastic sheet is installed at one end of the piston column away from the third elastic member, and the elastic sheet is located at the intersection of the outer flow channel and the inner flow channel.

[0022] The beneficial effects of the present invention are:

[0023] 1. The present invention is provided with a first connecting pipe, a second connecting pipe, a filter and a backwashing component. When the filtering accuracy of the pre-filtering device decreases, the deaerator head has an emergency means of liquid filtering, which improves or even avoids the blockage of the nozzle, and the user can reduce the filtering accuracy of the pre-filtering device according to the use cost, and only retain the large-aperture filtering device. At the same time, the filter has a backwashing effect. Even if the filter is blocked, the workers do not need to remove the deaerator head to clean the filter element, which further reduces the labor of the workers.

[0024] 2. The present invention enables the two filters to work in rotation through the arrangement of rotating balls, transmission rods, transmission gears and connecting pipes. When one of the filters becomes clogged and starts backwashing, the two rotating balls rotate 90 degrees synchronously to change the path of the liquid and enter the other filter. This method not only improves the problem of most impurities re-attaching to the filter element, extends the backwashing interval of a single filter, but also ensures the continuity of the deaerator head.

[0025] 3. The present invention is provided with a lifting plate, a reducing cylinder, an arc-shaped sheet and a side pipe. When the flow rate of the flow channel in the nozzle is reduced, the liquid is accelerated by the reducing cylinder to generate negative pressure at the side pipe, and the liquid in the second connecting pipe enters the nozzle from the side pipe and the external joint, thereby realizing flow compensation of the nozzle and improving the problem of poor liquid atomization effect caused by reduced flow rate when the deoxygenation equipment is running at low load and when the filter is severely blocked.

[0026] 4. The present invention is provided with notches, collecting chambers, collecting boxes and discharge ports. Whenever the filter completes a backwash, impurities gather in the collecting box. Even if the filter box starts working again, the impurities will not reattach to the filter element. Workers can clean the impurities in the collecting box through suction and pressure equipment without removing the deaerator head, which greatly reduces the labor intensity of workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The figure is a schematic diagram of the overall structure of an integrated deoxygenation system for a thermal power plant according to the present invention.

[0028] Figure 2 It is a schematic diagram of the three-dimensional structure of the deoxygenation system of the present invention.

[0029] Figure 3 It is a half-section schematic diagram of the deoxidation head of the present invention.

[0030] Figure 4 It is a schematic diagram of the structure of the filter assembly of the present invention.

[0031] Figure 5 It is a planar cross-sectional view of the filter assembly of the present invention.

[0032] Figure 6 It is a schematic diagram of the installation of the filter and the nozzle of the present invention.

[0033] Figure 7 It is a top view of the filter of the present invention.

[0034] Figure 8 for Figure 7 Schematic cross-sectional view at AA in the middle.

[0035] Fig. 9 It is a three-dimensional schematic diagram of the filter element of the present invention.

[0036] Fig.10 It is a schematic structural diagram of the recoil assembly of the present invention.

[0037] Fig.11 It is a cross-sectional schematic diagram of the second connecting pipe and the nozzle of the present invention.

[0038] Fig.12 It is a structural schematic diagram of the rotating ball of the present invention.

[0039] Fig.13 for Figure 6 A schematic diagram of the enlarged structure at point A in the middle.

[0040] Fig.14 for Fig.11 A magnified schematic diagram of the structure at point B in the middle.

[0041] Fig.15 It is a schematic structural diagram of the lifting plate and the arc-shaped sheet of the present invention.

[0042] Fig.16 for Figure 7 Schematic cross-sectional view at the middle BB.

[0043] The accompanying drawings are marked as follows:

[0044] 1. Water tank;

[0045] 2. Deaerator head; 21. Water inlet pipe;

[0046] 3. Nozzle; 31. Shell; 32. External flow channel; 33. Internal flow channel;

[0047] 4. Filter assembly; 41. Filter; 411. Shell; 412. Filter element; 4121. Support frame; 4122. Filter screen; 413. Inner cavity; 414. Outer cavity; 415. Collecting cavity; 416. Notch; 417. Collecting box; 418. Discharge port; 42. First connecting pipe; 43. Second connecting pipe;

[0048] 5. Switching assembly; 51. Rotating ball; 52. Through hole; 53. Pin; 54. Transmission rod; 55. Transmission gear; 56. Connecting pipe; 561. Piston rod; 562. Sliding rod; 57. Rack;

[0049] 6. Backwashing assembly; 61. Pressure plate; 62. Connecting shaft; 63. Rotating paddle; 631. Connecting column; 632. Blade; 64. Spiral track; 65. Connecting plate; 66. Connecting rod; 67. Stopper;

[0050] 7. pressure regulating member; 71. knob; 72. piston rod; 73. third elastic member; 74. elastic sheet;

[0051] 8. Flow compensation assembly; 81. Lifting plate; 82. Lifting slot; 83. Second elastic member; 84. Side pipe; 85. Reducer; 86. External joint; 87. Arc sheet. DETAILED DESCRIPTION

[0052] The following will be combined with the 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 described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0053] Example 1

[0054] In the actual production process, the existing spray water disc deaerator uses a pre-filter to filter the raw water to prevent impurities in the raw water from clogging the nozzle, but this method is often accompanied by an increase in cost, and when the filtering accuracy of the pre-filter decreases, there is no corresponding emergency filtering device in the demister. When the nozzle is blocked, the worker needs to remove the demister head, which is very troublesome. This embodiment is specially invented to solve the above problems.

[0055] See also Figures 1 to 16 As shown, an integrated deoxygenation system for a thermal power plant according to an embodiment of the present invention comprises a water tank 1 and a deoxygenation head 2 fixed to the top of the water tank 1, a plurality of water spray trays arranged up and down are arranged in the deoxygenation head 2, a water inlet pipe 21 is arranged on the top of the deoxygenation head 2, raw water to be deoxygenated enters the deoxygenation head 2 from the water inlet pipe 21, a nozzle 3 connected to the water inlet pipe 21 is arranged in the deoxygenation head 2, and a filter assembly 4 is arranged between the water inlet pipe 21 and the nozzle 3.

[0056] The filter assembly 4 includes two adjacently arranged filters 41 , and a first connecting pipe 42 and a second connecting pipe 43 are respectively arranged between the water inlet pipe 21 and the two filters 41 and between the nozzle 3 and the two filters 41 .

[0057] The filter 41 includes a shell 411, a cavity is formed in the shell 411, a filter element 412 is arranged in the cavity, the filter element 412 divides the cavity into an inner cavity 413 and an outer cavity 414, and a water inlet connected to the outer cavity 414 and a water outlet connected to the inner cavity 413 are respectively arranged at both ends of the shell 411, and a backwashing component 6 that cooperates with each other is arranged in the outer cavity 414 and the inner cavity 413.

[0058] The backwash assembly 6 includes a pressure plate 61 which is sealed and slides in the outer cavity 414, a first elastic member is arranged between the pressure plate 61 and the shell 411, a connecting shaft 62 is rotatably connected to the filter element 412, and a rotating paddle 63 is coaxially fixed to one end of the connecting shaft 62 which passes through the inner cavity 413, a spiral track 64 is provided on the circumferential side of the connecting shaft 62 located at one end of the outer cavity 414, a connecting plate 65 is slidably connected to the connecting shaft 62, a connecting block which meshes with the spiral track 64 is arranged on the connecting plate 65, and a plurality of circumferentially evenly distributed connecting rods 66 are arranged between the connecting plate 65 and the pressure plate 61.

[0059] The rotating paddle 63 includes a connecting column 631 coaxially fixed with the connecting shaft 62 , and a plurality of blades 632 evenly distributed around the circumference are fixedly connected to the circumferential side of the connecting column 631 .

[0060] A limiting member 67 located on one side of the first elastic member is disposed on the inner wall of the housing 411 . After the pressure plate 61 breaks through the restriction of the limiting member 67 , the pressure in the outer cavity 414 is instantly reduced and the rotating paddle 63 is rotated.

[0061] The limiting member 67 includes a wedge block sliding on the inner wall of the shell 411. The wedge block is slidably connected to the shell 411 through a spring, and the upper and lower side surfaces of the wedge block are both curved surfaces, and the curved surface angle of the lower side surface is larger. When the pressure on the pressure plate 61 reaches a certain level, the wedge block retracts into the shell 411, and the pressure plate 61 moves downward rapidly. Then the pressure plate 61 is reset under the action of the first elastic member, and the elastic force of the first elastic member is sufficient to shrink the wedge block.

[0062] When in use, raw water enters the outer cavity 414 of one of the filters 41 through the water inlet pipe 21 and the first connecting pipe 42 in turn, enters the inner cavity 413 after being filtered by the filter element 412, then enters the nozzle 3 through the second connecting pipe 43, and is sprayed out at the atomization outlet. When the filter element 412 is blocked, the pressure plate 61 moves downward as the pressure in the outer cavity 414 continues to increase, until the pressure plate 61 contacts the limiter 67, and the pressure plate 61 stays for a period of time. As the pressure in the outer cavity 414 continues to increase, the wedge block finally retracts into the shell 411 under the action of the pressure plate 61, and the pressure plate 61 suddenly moves downward for a distance. At this time, the connecting shaft 62 rotates under the action of the connecting plate 65, the spiral track 64 and the connecting block, and the rotating paddle 63 discharges the liquid in the inner cavity 413 to the outer cavity 414 during the rotation process, thereby achieving the effect of backwashing the filter element 412.

[0063] To sum up, through the settings of the first connecting pipe 42, the second connecting pipe 43, the filter 41 and the backwash component 6, when the filtering accuracy of the pre-filtering device decreases, the deaerator head 2 has an emergency means of liquid filtration, which improves or even avoids the clogging of the nozzle 3, and the user can reduce the filtering accuracy of the pre-filtering device according to the use cost, and only retain the large-aperture filtering device. At the same time, the filter 41 has a backwashing effect. Even if the filter 41 is blocked, the workers do not need to remove the deaerator head 2 to clean the filter element 412, which further reduces the labor of the workers.

[0064] Example 2

[0065] In actual use, it is found that after the filter 41 is backwashed, a large amount of impurities will accumulate in the outer cavity 414. If the filter 41 is put into operation immediately after backwashing, most of the impurities will be attached to the filter element 412 again, and the backwashing interval of the filter 41 will be shortened, which is not conducive to the continuity of the deoxygenation equipment. Further improvements are made on the basis of the above embodiment.

[0066] See also Figures 3 to 13 As shown, a first connecting pipe 42 and a second connecting pipe 43 are respectively arranged between the water inlet pipe 21 and the two filters 41 and between the nozzle 3 and the two filters 41, and a switching component 5 is arranged between the first connecting pipe 42, the second connecting pipe 43 and the two filters 41. When one of the filters 41 is clogged, the switching component 5 can connect the other filter 41 with the nozzle 3.

[0067] The switching assembly 5 includes two rotating balls 51 respectively located in the first connecting pipe 42 and the second connecting pipe 43. The rotating ball 51 is provided with three mutually connected through holes 52, and the axis angle between two adjacent through holes 52 is 90 degrees. A pin shaft 53 penetrating the first connecting pipe 42 and the second connecting pipe 43 is arranged on the top of the rotating ball 51. A transmission rod 54 is fixedly connected between the two pin shafts 53. A transmission gear 55 is coaxially fixed on the pin shaft 53 rotatably connected to the second connecting pipe 43. A connecting pipe 56 connected to the outer cavity 414 is fixedly connected in the housing 411 of the two filters 41. The connecting pipe 56 is filled with hydraulic oil. A piston rod 561 is sealingly and slidably connected in the connecting pipe 56. The end of the piston rod 561 away from the connecting pipe 56 is fixedly connected to the pressure plate 61. A sliding rod 562 is sealingly and slidably provided at the end of the connecting pipe 56 away from the pressure plate 61. A rack 57 meshing with the transmission gear 55 is fixedly connected between the two sliding rods 562.

[0068] When filtering the raw water, under the guidance of the two rotating balls 51, the raw water only passes through one of the filters 41. When the filter 41 is blocked, the pressure plate 61 breaks through the constraint of the limiter 67, and the piston rod 561 moves downward rapidly with the pressure plate 61. At this time, the slide bar 562 moves horizontally rapidly and, with the cooperation of the rack 57 and the transmission gear 55, the two rotating balls 51 rotate 90 degrees together, and the raw water changes its path and enters the other filter 41.

[0069] Inside the filter 41 after backwashing, the impurities dispersed in the outer cavity 414 settle downward under the action of gravity, preventing most of the impurities from re-attaching to the surface of the filter element 412 while the liquid is flowing.

[0070] To summarize, by means of the rotating ball 51, the transmission rod 54, the transmission gear 55 and the connecting pipe 56, the two filters 41 can work in rotation. When one of the filters 41 becomes clogged and starts backwashing, the two rotating balls 51 rotate 90 degrees synchronously, so that the liquid changes its path and enters the other filter 41. This method not only improves the problem of most impurities re-attaching to the filter element 412, extends the backwashing interval of a single filter 41, but also ensures the continuity of the operation of the deaerator head 2.

[0071] Example 3

[0072] In actual use, it is found that when the filter element 412 is blocked, the flow rate in the nozzle 3 will decrease, and the atomization pressure of the atomization outlet will decrease, which will not only weaken the atomization effect of the liquid, but also reduce the atomization area of ​​the nozzle 3, making the deoxygenation effect of the liquid worse. Further improvements are made on the basis of the above embodiment.

[0073] refer to Figures 11 to 15As shown, the nozzle 3 includes a shell 31, in which an outer flow channel 32 and an inner flow channel 33 are arranged. An atomization outlet connected to the inner flow channel 33 is arranged at one end of the shell 31 away from the second connecting pipe 43, and a pressure regulating member 7 is arranged on one side of the shell 31.

[0074] The pressure regulating member 7 includes a knob 71, in which a piston column 72 for transverse sliding is coaxially arranged, a third elastic member 73 is arranged between the piston column 72 and the knob 71, and an elastic sheet 74 is installed at one end of the piston column 72 away from the third elastic member 73, and the elastic sheet 74 is located at the intersection of the outer flow channel 32 and the inner flow channel 33.

[0075] The second connecting tube 43 and the inner flow channel 33 are provided with a flow compensation component 8 that cooperates with each other. When the flow in the nozzle 3 decreases, the flow compensation component 8 can send the liquid in the second connecting tube 43 to the inner flow channel 33 of the nozzle 3 and increase the liquid flow rate in the inner flow channel 33.

[0076] The flow compensation component 8 includes a lifting plate 81 arranged in the second connecting pipe 43, and a plurality of filter holes are provided on the lifting plate 81. Two symmetrically distributed lifting grooves 82 are provided on the inner wall of the second connecting pipe 43. A second elastic member 83 fixedly connected to the lifting plate 81 is provided in the lifting groove 82. A side pipe 84 is provided on the side wall of the second connecting pipe 43. A reducing cylinder 85 is fixedly connected to the inner wall of the inner flow channel 33. An external joint 86 located in the middle of the reducing cylinder 85 is provided on the side wall of the outer shell 31. The external joint 86 is connected to the side pipe 84 through a pipeline. An arc piece 87 is fixedly connected to the circumferential side of the lifting plate 81. When the lifting plate 81 is at different heights, the arc piece 87 has different shielding areas for the side pipe 84.

[0077] Both ends of the reducer cylinder 85 are inner conical structures, and a connecting hole communicating with the external joint 86 is opened in the middle of the reducer cylinder 85 .

[0078] During use, when the flow rate entering the nozzle 3 is large, the liquid pressure on the lifting plate 81 is large, and the arc-shaped piece 87 blocks a large area of ​​the side tube 84, or even completely blocks it. Conversely, when the flow rate entering the nozzle 3 is small, the arc-shaped piece 87 blocks a small area of ​​the side tube 84.

[0079] When the liquid enters the nozzle 3 and gathers in the outer flow channel 32, the elastic sheet 74 deforms to one side as the hydraulic pressure increases, and the outer flow channel 32 is gradually connected with the inner flow channel 33. The greater the liquid pressure, the greater the deformation of the elastic sheet 74, the higher the speed of the liquid entering the inner flow channel 33, the largest atomization area of ​​the liquid, and the best effect.

[0080] When the flow rate decreases, the speed of the liquid entering the inner flow channel 33 decreases, the blocking area of ​​the arc-shaped piece 87 on the side tube 84 is reduced, and the liquid is accelerated when passing through the reducer 85 due to the reduction in the tube diameter. According to the Venturi principle, negative pressure will be generated in the external joint 86 and the side tube 84, and the liquid in the second connecting tube 43 will be supplemented into the inner flow channel 33, so as to achieve flow compensation and improve the atomization effect of the liquid.

[0081] To sum up, through the settings of the lifting plate 81, the reducing cylinder 85, the arc piece 87 and the side pipe 84, when the flow rate of the flow channel 33 in the nozzle 3 is reduced, the liquid is accelerated by the reducing cylinder 85 to generate negative pressure at the side pipe 84, and the liquid in the second connecting pipe 43 enters the nozzle 3 from the side pipe 84 and the external connector 86, thereby realizing the flow compensation of the nozzle 3, improving the problem of poor liquid atomization effect caused by reduced flow rate when the deoxygenation equipment is running at low load and when the filter screen 4122 is severely blocked.

[0082] Example 4

[0083] In order to facilitate the cleaning of impurities in the filter 41, workers do not need to remove the deoxidation head 2. Further improvements are made on the basis of the above embodiment.

[0084] refer to Figures 8 to 16 As shown, the filter element 412 includes a support frame 4121 and a filter screen 4122, a collecting chamber 415 is formed between the support frame 4121 and the shell 411, the pressure plate 61 is an annular structure and is coaxially sleeved on the outside of the support frame 4121, and a plurality of circumferentially evenly distributed notches 416 are opened on the circumferential side of the support frame 4121, and a collecting box 417 is fixedly connected to one end of the shell 411 close to the water outlet, and the collecting box 417 is communicated with the collecting chamber 415, and a discharge port 418 is provided on one side of the collecting box 417, and the discharge port 418 is externally connected to a pressure extraction device.

[0085] The pressure-bearing surface of the pressure plate 61 is an inclined surface and presents an inner conical structure. In the initial state of the pressure plate 61 , the lowest point of the pressure plate 61 is consistent with the lowest point of the notch 416 .

[0086] When in use, impurities in the outer cavity 414 are deposited downward under the action of gravity and enter the collection cavity 415 under the guidance of the pressure plate 61. The impurities in the collection cavity 415 enter the collection box 417. Workers can clean the impurities in the collection box 417 after each self-cleaning of the filter element 412 or regularly.

[0087] The pumping equipment includes a water pump, a water tank 1 and a connecting pipe 56 . After the worker starts the water pump, the impurities in the collection box 417 enter the water tank 1 through the connecting pipe 56 .

[0088] To sum up, through the settings of the notch 416, the collection chamber 415, the collection box 417 and the discharge port 418, every time the filter 41 completes a backwash, the impurities gather in the collection box 417. Even if the filter box starts working again, the impurities will not re-attach to the filter element 412, and the workers can clean the impurities in the collection box 417 through the vacuum equipment without removing the deaerator head 2, which greatly reduces the labor intensity of the workers.

[0089] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An integrated deoxidation system for a thermal power plant, comprising a water tank and a deoxidation head fixed on the top of the water tank, characterized in that: A water inlet pipe is arranged on the top of the deaerator head, a nozzle connected to the water inlet pipe is arranged inside the deaerator head, and a filter assembly is arranged between the water inlet pipe and the nozzle; The filter assembly comprises two filters arranged adjacent to each other, a first connecting pipe and a second connecting pipe are respectively arranged between the water inlet pipe and the two filters and between the nozzle and the two filters, a switching assembly is arranged between the first connecting pipe, the second connecting pipe and the two filters, and when one of the filters is clogged, the switching assembly can connect the other filter with the nozzle; The filter comprises a shell with a cavity formed in the shell, a filter element is arranged in the cavity, the filter element divides the cavity into an inner cavity and an outer cavity, a water inlet connected to the outer cavity and a water outlet connected to the inner cavity are respectively arranged at two ends of the shell, and backwashing components that cooperate with each other are arranged in the outer cavity and the inner cavity.

2. The integrated deoxidation system for thermal power plants according to claim 1, characterized in that: The backwashing assembly includes a pressure plate that is sealed and slides in the outer cavity, a first elastic member is arranged between the pressure plate and the shell, a connecting shaft is rotatably connected to the filter element, a rotating paddle is coaxially fixed to one end of the connecting shaft that passes through the inner cavity, a spiral track is opened on the circumferential side of the connecting shaft located at one end of the outer cavity, a connecting plate is slidably connected to the connecting shaft, a connecting block that meshes with the spiral track is arranged on the connecting plate, and a plurality of connecting rods uniformly distributed around the circumference are arranged between the connecting plate and the pressure plate; A limiting piece is arranged on the inner wall of the shell and is located on one side of the first elastic piece. After the pressure plate breaks through the restriction of the limiting piece, the pressure in the outer cavity is instantly reduced and the rotating paddle is rotated.

3. The integrated deoxidation system for thermal power plants according to claim 2, characterized in that: The switching assembly includes two rotating balls respectively located in the first connecting tube and the second connecting tube, the rotating ball is provided with three through holes connected to each other, and the axial angle between two adjacent through holes is degrees, a pin shaft penetrating the first connecting tube and the second connecting tube is provided on the top of the rotating ball, a transmission rod is fixedly connected between the two pin shafts, a transmission gear is coaxially fixed on the pin shaft rotatably connected to the second connecting tube, a connecting tube connected to the outer cavity is fixedly connected to the shells of the two filters, a piston rod is sealingly and slidably connected in the connecting tube, the end of the piston rod away from the connecting tube is fixedly connected to the pressure plate, the end of the connecting tube away from the pressure plate is sealingly and slidably provided with a sliding rod, and a rack meshing with the transmission gear is fixedly connected between the two sliding rods.

4. The integrated deoxidation system for thermal power plants according to claim 3, characterized in that: The nozzle comprises a shell, an outer flow channel and an inner flow channel are arranged in the shell, an atomization outlet connected to the inner flow channel is arranged at one end of the shell away from the second connecting pipe, and a pressure regulating member is arranged on one side of the shell; The second connecting tube and the inner flow channel are provided with flow compensation components that cooperate with each other. When the flow in the nozzle decreases, the flow compensation component can send the liquid in the second connecting tube to the inner flow channel of the nozzle and increase the liquid flow rate in the inner flow channel.

5. The integrated deoxidation system for thermal power plants according to claim 4, characterized in that: The flow compensation component includes a lifting plate arranged in a second connecting pipe, a plurality of filter holes are provided on the lifting plate, two symmetrically distributed lifting grooves are provided on the inner wall of the second connecting pipe, a second elastic member fixedly connected to the lifting plate is provided in the lifting groove, a side tube is provided on the side wall of the second connecting pipe, a reducing cylinder is fixedly connected to the inner wall of the inner flow channel, an external joint connected to the middle part of the reducing cylinder is provided on the side wall of the outer shell, the external joint is connected to the side tube through a pipeline, an arc-shaped sheet is fixedly connected to the circumferential side of the lifting plate, and when the lifting plate is at different heights, the arc-shaped sheet has different shielding areas for the side tube.

6. The integrated deoxidation system for thermal power plants according to claim 5, characterized in that: The filter element includes a support frame and a filter screen, a collecting chamber is formed between the support frame and the shell, the pressure plate is an annular structure and is coaxially sleeved on the outside of the support frame, a plurality of circumferentially evenly distributed notches are opened on the circumferential side of the support frame, a collecting box is fixedly connected to one end of the shell near the water outlet, the collecting box is communicated with the collecting chamber, a discharge port is provided on one side of the collecting box, and the discharge port is externally connected to a pressure extraction device.

7. The integrated deoxidation system for thermal power plants according to claim 6, characterized in that: The pressure-bearing surface of the pressure plate is an inclined surface and presents an inner conical structure. In the initial state of the pressure plate, the lowest point of the pressure plate is consistent with the lowest point of the notch.

8. The integrated deoxidation system for thermal power plants according to claim 7, characterized in that: The rotating paddle comprises a connecting column fixed coaxially with the connecting shaft, and a plurality of blades evenly distributed around the circumference are fixedly connected to the circumferential side of the connecting column.

9. The integrated deoxidation system for thermal power plants according to claim 8, characterized in that: Both ends of the reducer are inner cone structures, and a connecting hole communicating with the external joint is provided in the middle of the reducer.

10. The integrated deoxidation system for thermal power plants according to claim 9, characterized in that: The pressure regulating member comprises a knob, in which a piston column is coaxially arranged for transverse sliding, a third elastic member is arranged between the piston column and the knob, an elastic sheet is installed at one end of the piston column away from the third elastic member, and the elastic sheet is located at the intersection of the outer flow channel and the inner flow channel.

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