Integrated deaerating system for thermal power plant

Abstract

The application discloses a thermal power plant integrated deoxidizing system and relates to the technical field of thermal deoxidizing equipment. The deoxidizing system comprises a water tank and a deoxidizing head fixed to the top of the water tank. The top of the deoxidizing head is provided with a water inlet pipe. The deoxidizing head is provided with a spray head in communication with the water inlet pipe. A filter assembly is arranged between the water inlet pipe and the spray head. The first communication pipe, the second communication pipe, the filter and the backwashing assembly are arranged. When the filtering precision of the pre-filtering device is reduced, the deoxidizing head has an emergency means for liquid filtering, the clogging of the spray head is improved or even avoided, the filtering precision of the pre-filtering device can be reduced according to the use cost, only the filter device with large aperture needs to be reserved, meanwhile, the filter has a backwashing effect, even if the filter is clogged, workers do not need to disassemble the deoxidizing head to clean the filter element, and the labor amount of the workers is further reduced.

Description

Technical Field

[0001] This invention relates to the field of thermal deoxygenation equipment technology, and in particular to an integrated deoxygenation system for thermal power plants. Background Technology

[0002] A thermal deaerator is a new type of deoxygenation device that can remove dissolved oxygen and other gases from the feedwater of a thermal system, prevent corrosion of thermal equipment, and is an important piece of equipment to ensure the safe operation of power plants and industrial boilers.

[0003] Spray-type deaerators are widely used in thermal power plants due to their simple structure and low cost. However, they have high requirements for water quality; if the raw water is not filtered, impurities in the water will clog and damage the nozzles. Current solutions involve adding pretreatment equipment, such as water softeners or pre-filters, upstream of the demister.

[0004] Chinese patent application CN202311134965.5 discloses a thermal deaerator and boiler heating system. By setting a water storage space in the upper part of the deaerator, the contact time between steam and water can be increased, improving the deaeration effect. The gravity of the water in the storage space facilitates easy cleaning of the filter plates, improving their clogging situation. However, this invention does not include a filtration device within the demister head, still employing a pre-filtration method. This method often leads to increased costs, and when the filtration accuracy of the pre-filtration equipment decreases, the demister lacks a corresponding emergency filtration device. When the nozzle becomes clogged, workers need to remove the demister head, which is very troublesome.

[0005] Meanwhile, when the spray disc demister is running at low load, the atomization effect of the liquid deteriorates and the deoxygenation efficiency decreases due to the reduced flow rate and liquid pressure in the inlet pipe.

[0006] Therefore, this invention proposes an integrated deoxygenation system for thermal power plants to solve the above problems. Summary of the Invention

[0007] The purpose of this invention is to provide an integrated deaeration system for thermal power plants to solve the technical problems mentioned in the background art, such as the lack of filtration function in existing deaerators and the poor atomization effect caused by insufficient flow when the equipment is running at low load.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an integrated deoxygenation system for a thermal power plant, comprising a water tank and a deoxygenation head fixed to the top of the water tank, wherein a water inlet pipe is provided at the top of the deoxygenation head, a nozzle communicating with the water inlet pipe is provided inside the deoxygenation head, and a filter assembly is provided between the water inlet pipe and the nozzle.

[0009] The filter assembly includes two adjacent filters. A first connecting pipe and a second connecting pipe are respectively provided between the water inlet pipe and the two filters, and between the nozzle and the two filters. A switching assembly is provided between the first connecting pipe, the second connecting pipe and the two filters. When one of the filters becomes blocked, the switching assembly can connect the other filter to the nozzle.

[0010] The filter includes a housing with a cavity inside. A filter element is disposed inside the cavity, and the filter element divides the cavity into an inner cavity and an outer cavity. An inlet communicating with the outer cavity and an outlet communicating with the inner cavity are respectively disposed at both ends of the housing. A backwashing assembly that cooperates with each other is disposed in the outer cavity and the inner cavity.

[0011] Preferably, the backwashing assembly includes a pressure plate that is sealed and slides within the outer cavity, a first elastic element is provided between the pressure plate and the housing, a connecting shaft is rotatably connected to the filter element, a rotating impeller is coaxially fixed at one end of the connecting shaft that extends into the inner cavity, a spiral track is provided on the circumferential side of the connecting shaft 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 provided on the connecting plate, and a plurality of circumferentially distributed connecting rods are provided between the connecting plate and the pressure plate;

[0012] The inner wall of the housing is provided with a limiting member located on one side of the first elastic member. After the pressure plate breaks through the limitation of the limiting member, the pressure in the outer cavity drops instantly and causes the rotating paddle to rotate.

[0013] Preferably, the switching assembly includes two rotating balls located in the first and second connecting pipes respectively. Each rotating ball has three interconnected through holes, with the included angle between the axes of two adjacent through holes being 90 degrees. A pin is provided at the top of each rotating ball, penetrating the first and second connecting pipes. A transmission rod is fixedly connected between the two pins. A transmission gear is coaxially fixed on the pin rotatably connected to the second connecting pipe. Each of the two filter housings has a connecting pipe fixedly connected to its outer cavity. A piston rod is slidably and sealed within the connecting pipe. The end of the piston rod away from the connecting pipe is fixedly connected to a pressure plate. A sliding rod is slidably and sealed at the end of the connecting pipe away from the pressure plate. A rack that meshes with the transmission gear is fixedly connected between the two sliding rods.

[0014] Preferably, the nozzle includes a housing, an outer flow channel and an inner flow channel are provided inside the housing, an atomizing outlet communicating with the inner flow channel is provided at the end of the housing away from the second connecting pipe, and a pressure regulating element is provided on one side of the housing;

[0015] The second connecting pipe and the inner flow channel are equipped with mutually cooperating flow compensation components. When the flow rate in the nozzle decreases, the flow compensation components can send the liquid in the second connecting pipe 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 disposed within a second connecting pipe, the lifting plate having multiple filter holes, two symmetrically distributed lifting grooves disposed on the inner wall of the second connecting pipe, a second elastic element fixedly connected to the lifting plate disposed within the lifting groove, a side pipe disposed on the side wall of the second connecting pipe, a reducing cylinder fixedly connected to the inner wall of the inner flow channel, an external connector connected to the middle of the reducing cylinder disposed on the side wall of the outer shell, the external connector being connected to the side pipe via a pipe, and an arc-shaped plate fixedly connected to the circumferential side of the lifting plate, wherein the area of ​​the arc-shaped plate covering the side pipe varies at different heights of the lifting plate.

[0017] Preferably, the filter element includes a support frame and a filter screen. A collection cavity is formed between the support frame and the housing. The pressure plate is an annular structure and is coaxially sleeved on the outside of the support frame. The support frame has multiple circumferentially distributed notches on its circumferential side. A collection box is fixedly connected to one end of the housing near the outlet. The collection box communicates with the collection cavity. A discharge port is provided on one side of the collection box. The discharge port is connected to a pressure pump.

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

[0019] Preferably, the rotating propeller includes a connecting column fixed coaxially with the connecting shaft, and a plurality of circumferentially distributed blades are fixedly connected to the circumferential side of the connecting column.

[0020] Preferably, the two ends of the variable diameter cylinder are internal conical structures, and a connection hole communicating with the external connector is provided in the middle of the variable diameter cylinder.

[0021] Preferably, the pressure regulating component includes a knob, a piston rod that slides laterally is coaxially disposed inside the knob, a third elastic element is disposed between the piston rod and the knob, an elastic plate is installed at the end of the piston rod away from the third elastic element, and the elastic plate is located at the junction of the outer flow channel and the inner flow channel.

[0022] The beneficial effects of this invention are:

[0023] 1. This invention, through the arrangement of a first connecting pipe, a second connecting pipe, a filter, and a backwashing assembly, provides an emergency liquid filtration solution for the deaerator head when the filtration accuracy of the pre-filter decreases, improving or even preventing nozzle clogging. Furthermore, users can reduce the filtration accuracy of the pre-filter based on operating costs, retaining only the large-aperture filter. Simultaneously, the filter has a backwashing effect, so even if the filter becomes clogged, workers do not need to remove the deaerator head to clean the filter element, further reducing the workload of workers.

[0024] 2. This invention uses rotating balls, transmission rods, transmission gears, and connecting pipes to enable two filters to work alternately. When one filter becomes clogged and begins backwashing, the two rotating balls rotate 90 degrees synchronously, causing the liquid to change its path and enter the other filter. This method not only improves the problem of most impurities re-attaching to the filter element and extends the backwashing interval of a single filter, but also ensures the continuity of the deoxygenation head's operation.

[0025] 3. This invention uses a lifting plate, a variable diameter cylinder, an arc-shaped plate, and a side pipe to achieve flow compensation of the nozzle. When the flow rate in the nozzle's internal channel decreases, the liquid is accelerated by the variable diameter cylinder, creating negative pressure at the side pipe. The liquid in the second connecting pipe enters the nozzle from the side pipe and the external connector, thus improving the problem of poor liquid atomization caused by reduced flow rate when the deoxygenation equipment is operating under low load or when the filter screen becomes heavily clogged.

[0026] 4. With the design of notches, collection chambers, collection boxes, and discharge ports, the present invention ensures that after each backwash of the filter, impurities accumulate in the collection box. Even if the filter box restarts, the impurities will not re-adhere to the filter element. Furthermore, workers can clean the impurities in the collection box using a suction device without removing the deaerator head, which greatly reduces the labor intensity of workers. Attached Figure Description

[0027] Figure 1 This 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 This is a three-dimensional structural diagram of the deoxygenation system of the present invention.

[0029] Figure 3 This is a half-sectional schematic diagram of the deoxygenation head of the present invention.

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

[0031] Figure 5 This is a planar sectional view of the filtering component of the present invention.

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

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

[0034] Figure 8 for Figure 7 Schematic diagram of cross-section at point AA.

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

[0036] Figure 10 This is a schematic diagram of the recoil assembly of the present invention.

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

[0038] Figure 12 This is a schematic diagram of the rotating ball structure of the present invention.

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

[0040] Figure 14 for Figure 11 Enlarged schematic diagram of the structure at point B.

[0041] Figure 15 This is a schematic diagram of the lifting plate and arc-shaped plate of the present invention.

[0042] Figure 16 for Figure 7 Schematic diagram of cross-section at point BB.

[0043] The attached figures are labeled as follows:

[0044] 1. Water tank;

[0045] 2. Deaerator; 21. Inlet pipe;

[0046] 3. Nozzle; 31. Housing; 32. Outer flow channel; 33. Inner flow channel;

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

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

[0049] 6. Backwash assembly; 61. Pressure plate; 62. Connecting shaft; 63. Rotating impeller; 631. Connecting column; 632. Blade; 64. Helical track; 65. Connecting plate; 66. Connecting rod; 67. Limiting component;

[0050] 7. Pressure regulating component; 71. Knob; 72. Piston rod; 73. Third elastic element; 74. Elastic plate;

[0051] 8. Flow compensation component; 81. Lifting plate; 82. Lifting groove; 83. Second elastic element; 84. Side pipe; 85. Variable diameter cylinder; 86. External connector; 87. Arc plate. Detailed Implementation

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] Example 1

[0054] In actual production, existing spray-type disc deaerators use pre-filtration equipment to filter the raw water to prevent impurities in the raw water from clogging the nozzles. However, this method often results in increased costs, and when the filtration accuracy of the pre-filtration equipment decreases, there is no corresponding emergency filtration device in the demister. When the nozzles become clogged, workers need to remove the demister heads, which is very troublesome. To solve the above problems, this embodiment is invented.

[0055] Please see Figures 1 to 16 As shown, an integrated deoxygenation system for a thermal power plant according to an embodiment of the present invention includes a water tank 1 and a deoxygenation head 2 fixed to the top of the water tank 1. The deoxygenation head 2 is provided with a plurality of water spray plates arranged vertically. The top of the deoxygenation head 2 is provided with a water inlet pipe 21. The raw water to be deoxygenated enters the deoxygenation head 2 through the water inlet pipe 21. The deoxygenation head 2 is provided with a spray nozzle 3 communicating with the water inlet pipe 21. A filter assembly 4 is provided between the water inlet pipe 21 and the spray nozzle 3.

[0056] The filter assembly 4 includes two adjacent filters 41. A first connecting pipe 42 and a second connecting pipe 43 are respectively provided 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 housing 411, a cavity is formed inside the housing 411, a filter element 412 is disposed inside the cavity, the filter element 412 divides the cavity into an inner cavity 413 and an outer cavity 414, the two ends of the housing 411 are respectively provided with an inlet communicating with the outer cavity 414 and an outlet communicating with the inner cavity 413, and a backwashing assembly 6 is disposed in the outer cavity 414 and the inner cavity 413.

[0058] The backwashing assembly 6 includes a pressure plate 61 that is sealed and slides within the outer cavity 414. A first elastic element is provided between the pressure plate 61 and the housing 411. A connecting shaft 62 is rotatably connected to the filter element 412. A rotating impeller 63 is coaxially fixed at one end of the connecting shaft 62 that extends into the inner cavity 413. A spiral track 64 is provided on the circumferential side of the connecting shaft 62 at one end of the outer cavity 414. A connecting plate 65 is slidably connected to the connecting shaft 62. A connecting block that meshes with the spiral track 64 is provided on the connecting plate 65. A plurality of circumferentially distributed connecting rods 66 are provided between the connecting plate 65 and the pressure plate 61.

[0059] The rotating propeller 63 includes a connecting column 631 that is coaxially fixed with the connecting shaft 62, and multiple circumferentially distributed blades 632 are fixedly connected to the circumferential side of the connecting column 631.

[0060] A limiting member 67 is provided on the inner wall of the housing 411, located on one side of the first elastic member. After the pressure plate 61 breaks through the limitation of the limiting member 67, the pressure in the outer cavity 414 drops instantly and causes the rotating paddle 63 to rotate.

[0061] The limiting member 67 includes a wedge block that slides on the inner wall of the housing 411. The wedge block is slidably connected to the housing 411 by a spring, and both the upper and lower sides of the wedge block are arc surfaces, with the lower side having a larger arc angle. When the pressure on the pressure plate 61 reaches a certain level, the wedge block retracts into the housing 411, and the pressure plate 61 moves downward rapidly. Subsequently, 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 cause the wedge block to contract.

[0062] In use, raw water enters the outer cavity 414 of one of the filters 41 sequentially through the inlet pipe 21 and the first connecting pipe 42, and after being filtered by the filter element 412, it enters the inner cavity 413. Then, it 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 increases until the pressure plate 61 contacts the limiting member 67 and stays for a period of time. As the pressure in the outer cavity 414 continues to increase, the wedge block is finally retracted into the housing 411 under the action of the pressure plate 61. The pressure plate 61 suddenly moves downward a certain 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. During the rotation, the rotating paddle 63 discharges the liquid in the inner cavity 413 to the outer cavity 414, thereby achieving the backwashing effect of the filter element 412.

[0063] In summary, through the configuration of the first connecting pipe 42, the second connecting pipe 43, the filter 41, and the backwashing assembly 6, the deaerator head 2 provides an emergency means of liquid filtration when the filtration accuracy of the pre-filter decreases, improving or even preventing the nozzle 3 from becoming clogged. Furthermore, users can reduce the filtration accuracy of the pre-filter based on operating costs, retaining only the large-aperture filter. At the same time, the filter 41 has a backwashing effect, so even if the filter 41 becomes clogged, workers do not need to remove the deaerator head 2 to clean the filter element 412, further reducing the workload of workers.

[0064] Example 2

[0065] In actual use, it was found that after backwashing the filter 41, a large amount of impurities would accumulate in the outer cavity 414. If the backwashed filter 41 were put back into operation immediately, most of the impurities would re-adhere to the filter element 412, shortening the backwashing interval of the filter 41 and hindering the continuity of the deoxygenation equipment. Further improvements were made based on the above embodiments.

[0066] Please see Figures 3 to 13 As shown, a first connecting pipe 42 and a second connecting pipe 43 are respectively provided between the water inlet pipe 21 and the two filters 41, and between the nozzle 3 and the two filters 41. A switching component 5 is provided between the first connecting pipe 42, the second connecting pipe 43 and the two filters 41. When one of the filters 41 becomes blocked, the switching component 5 can connect the other filter 41 to the nozzle 3.

[0067] The switching assembly 5 includes two rotating balls 51 located in the first connecting pipe 42 and the second connecting pipe 43 respectively. The rotating balls 51 have three interconnected through holes 52, and the included angle between the axes of two adjacent through holes 52 is 90 degrees. The top of the rotating balls 51 is provided with a pin 53 that passes through the first connecting pipe 42 and the second connecting pipe 43. A transmission rod 54 is fixedly connected between the two pins 53. A transmission gear 55 is coaxially fixed on the pin 53 that is rotatably connected to the second connecting pipe 43. A connecting pipe 56 communicating with the outer cavity 414 is fixedly connected inside the housing 411 of the two filters 41. The connecting pipe 56 is filled with hydraulic oil. A piston rod 561 is slidably connected inside 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 slide rod 562 is slidably connected to the end of the connecting pipe 56 away from the pressure plate 61. The same rack 57 that meshes with the transmission gear 55 is fixedly connected between the two slide rods 562.

[0068] When filtering raw water, guided by the two rotating balls 51, the raw water only passes through one of the filters 41. When the filter 41 becomes clogged, the pressure plate 61 breaks through the constraint of the limiting member 67, and the piston rod 561 moves downward rapidly with the pressure plate 61. At this time, the slide rod 562 moves laterally rapidly and, with the cooperation of the rack 57 and the transmission gear 55, makes 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 backwashed filter 41, the impurities dispersed in the outer cavity 414 settle downwards under the action of gravity, preventing most of the impurities from re-adhering to the surface of the filter element 412 while the liquid is flowing.

[0070] In summary, by using the rotating ball 51, transmission rod 54, transmission gear 55, and connecting pipe 56, the two filters 41 can work alternately. When one of the filters 41 becomes clogged and begins backwashing, the two rotating balls 51 rotate 90 degrees synchronously, causing the liquid to change its path and enter the other filter 41. This method not only improves the problem of most impurities re-attaching to the filter element 412 and extends the backwashing interval of a single filter 41, but also ensures the continuity of the deoxygenation head 2's operation.

[0071] Example 3

[0072] In practical use, it was found that when the filter element 412 becomes clogged, the flow rate inside the nozzle 3 decreases. This reduces the atomization pressure at the atomization outlet, weakening the liquid atomization effect and reducing the atomization area of ​​the nozzle 3, thus worsening the deoxygenation effect of the liquid. Further improvements were made based on the above embodiments.

[0073] refer to Figures 11 to 15As shown, the nozzle 3 includes a housing 31, an outer flow channel 32 and an inner flow channel 33 are provided inside the housing 31, and an atomization outlet communicating with the inner flow channel 33 is provided at one end of the housing 31 away from the second connecting pipe 43. A pressure regulating component 7 is provided on one side of the housing 31.

[0074] The pressure regulating component 7 includes a knob 71, a piston 72 that slides laterally is coaxially disposed inside the knob 71, a third elastic element 73 is disposed between the piston 72 and the knob 71, and an elastic plate 74 is installed at the end of the piston 72 away from the third elastic element 73. The elastic plate 74 is located at the junction of the outer flow channel 32 and the inner flow channel 33.

[0075] The second connecting pipe 43 and the inner flow channel 33 are equipped with a flow compensation component 8 that works in conjunction with each other. When the flow rate in the nozzle 3 decreases, the flow compensation component 8 can send the liquid in the second connecting pipe 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 disposed in the second connecting pipe 43, the lifting plate 81 having multiple filter holes, two symmetrically distributed lifting grooves 82 disposed on the inner wall of the second connecting pipe 43, a second elastic element 83 fixedly connected to the lifting plate 81 disposed in the lifting groove 82, a side pipe 84 disposed on the side wall of the second connecting pipe 43, a reducing cylinder 85 fixedly connected to the inner wall of the inner flow channel 33, an external connector 86 located in the middle of the reducing cylinder 85 disposed on the side wall of the outer shell 31, the external connector 86 being connected to the side pipe 84 via a pipe, and an arc-shaped plate 87 fixedly connected to the circumferential side of the lifting plate 81, the arc-shaped plate 87 having different blocking areas on the side pipe 84 when the lifting plate 81 is at different heights.

[0077] The two ends of the reducing cylinder 85 are internal conical structures, and a connecting hole communicating with the external connector 86 is opened in the middle of the reducing cylinder 85.

[0078] When in 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 plate 87 covers a large area of ​​the side pipe 84, or even completely blocks it. Conversely, when the flow rate entering the nozzle 3 is small, the arc-shaped plate 87 covers a small area of ​​the side pipe 84.

[0079] When the liquid enters the nozzle 3 and accumulates in the outer channel 32, as the hydraulic pressure increases, the elastic sheet 74 deforms to one side, and the outer channel 32 gradually connects with the inner channel 33. The greater the liquid pressure, the greater the deformation of the elastic sheet 74, the higher the liquid velocity entering the inner channel 33, and the larger the atomization area and the better the effect of the liquid.

[0080] When the flow rate decreases, the liquid velocity entering the inner flow channel 33 decreases, the shielding area of ​​the arc plate 87 on the side pipe 84 decreases, and the liquid will accelerate when passing through the reducing cylinder 85 due to the reduced pipe diameter. According to the Venturi principle, a negative pressure will be generated in the outer connector 86 and the side pipe 84, and the liquid in the second connecting pipe 43 will be replenished into the inner flow channel 33, thereby achieving flow compensation and improving the atomization effect of the liquid.

[0081] In summary, by using the lifting plate 81, the reducing cylinder 85, the arc-shaped plate 87, and the side pipe 84, when the flow rate of the inner flow channel 33 of the nozzle 3 decreases, the liquid is accelerated by the reducing cylinder 85, causing a negative pressure to be generated at the side pipe 84. The liquid in the second connecting pipe 43 enters the nozzle 3 from the side pipe 84 and the external connector 86, thereby achieving flow compensation of the nozzle 3 and improving the problem of poor liquid atomization effect caused by reduced flow rate when the deoxygenation equipment is operating under low load and when the filter screen 4122 is heavily clogged.

[0082] Example 4

[0083] To facilitate the cleaning of impurities inside filter 41, it is not necessary for workers to remove the deaerator head 2. Further improvements have been made based on 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 collection chamber 415 is formed between the support frame 4121 and the housing 411. The pressure plate 61 has an annular structure and is coaxially sleeved on the outside of the support frame 4121. Multiple circumferentially distributed notches 416 are opened on the circumferential side of the support frame 4121. A collection box 417 is fixedly connected to one end of the housing 411 near the water outlet. The collection box 417 communicates with the collection chamber 415. A discharge port 418 is provided on one side of the collection box 417. The discharge port 418 is connected to a pressure pump.

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

[0086] During use, impurities in the outer cavity 414 are deposited downwards 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 periodically.

[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] In summary, through the design of the notch 416, the collection chamber 415, the collection box 417, and the discharge port 418, impurities accumulate in the collection box 417 after each backwash of the filter 41. Even if the filter box restarts, the impurities will not re-adhere to the filter element 412. Furthermore, workers can clean the impurities in the collection box 417 using a suction device without removing the deaerator head 2, which greatly reduces the labor intensity of the workers.

[0089] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An integrated deaeration system for a thermal power plant, comprising a water tank and a deaeration head fixed to the top of the water tank, characterized in that, The top of the deaerator head is provided with a water inlet pipe, and a nozzle connected to the water inlet pipe is provided inside the deaerator head. A filter assembly is provided between the water inlet pipe and the nozzle. The filter assembly includes two adjacent filters. A first connecting pipe and a second connecting pipe are respectively provided between the water inlet pipe and the two filters, and between the nozzle and the two filters. A switching assembly is provided between the first connecting pipe, the second connecting pipe and the two filters. When one of the filters becomes blocked, the switching assembly can connect the other filter to the nozzle. The filter includes a housing with a cavity inside. A filter element is disposed inside the cavity, and the filter element divides the cavity into an inner cavity and an outer cavity. An inlet communicating with the outer cavity and an outlet communicating with the inner cavity are respectively disposed at both ends of the housing. A backwashing assembly that cooperates with each other is disposed in the outer cavity and the inner cavity. The backwashing assembly includes a pressure plate that slides and seals within the outer cavity. A first elastic element is provided between the pressure plate and the housing. A connecting shaft is rotatably connected to the filter element. A rotating impeller is coaxially fixed to one end of the connecting shaft that extends into the inner cavity. A helical track is provided on the circumferential side of the connecting shaft at one end of the outer cavity. A connecting plate is slidably connected to the connecting shaft. A connecting block that meshes with the helical track is provided on the connecting plate. Multiple circumferentially distributed connecting rods are provided between the connecting plate and the pressure plate. A limiting element is provided on the inner wall of the housing, located on one side of the first elastic element. When the pressure plate breaks through the limitation of the limiting element, the pressure in the outer cavity drops instantaneously, causing the rotating impeller to rotate.

2. The integrated deaeration system for a thermal power plant according to claim 1, characterized in that, The switching assembly includes two rotating balls located inside the first and second connecting pipes, respectively. Each rotating ball has three interconnected through holes, with the included angle between the axes of adjacent through holes being [degree]. A pin is provided at the top of each rotating ball, penetrating both the first and second connecting pipes. A transmission rod is fixedly connected between the two pins. A transmission gear is coaxially fixed to the pin rotatably connected to the second connecting pipe. Each of the two filter housings has a connecting pipe fixedly connected to its external cavity. A piston rod is slidably and sealed within the connecting pipe. The end of the piston rod away from the connecting pipe is fixedly connected to a pressure plate. A sliding rod is slidably and sealed at the end of the connecting pipe away from the pressure plate. A rack that meshes with the transmission gear is fixedly connected between the two sliding rods.

3. The integrated deaeration system for a thermal power plant according to claim 2, characterized in that, The nozzle includes a housing, an outer flow channel and an inner flow channel are provided inside the housing, an atomization outlet communicating with the inner flow channel is provided at the end of the housing away from the second connecting pipe, and a pressure regulating component is provided on one side of the housing. The second connecting pipe and the inner flow channel are equipped with mutually cooperating flow compensation components. When the flow rate in the nozzle decreases, the flow compensation components can send the liquid in the second connecting pipe to the inner flow channel of the nozzle and increase the liquid flow rate in the inner flow channel.

4. The integrated deaeration system for a thermal power plant according to claim 3, characterized in that, The flow compensation component includes a lifting plate disposed within a second connecting pipe, the lifting plate having multiple filter holes, two symmetrically distributed lifting grooves on the inner wall of the second connecting pipe, a second elastic element fixedly connected to the lifting plate being disposed within the lifting groove, a side pipe being disposed on the side wall of the second connecting pipe, a reducing cylinder being fixedly connected to the inner wall of the inner flow channel, an external connector connected to the middle of the reducing cylinder being disposed on the side wall of the outer shell, the external connector being connected to the side pipe via a pipe, and an arc-shaped plate being fixedly connected to the circumferential side of the lifting plate, the arc-shaped plate having different blocking areas on the side pipe at different heights of the lifting plate.

5. The integrated deaeration system for a thermal power plant according to claim 4, characterized in that, The filter element includes a support frame and a filter screen. A collection cavity is formed between the support frame and the housing. The pressure plate is an annular structure and is coaxially sleeved on the outside of the support frame. Multiple circumferentially distributed notches are opened on the circumferential side of the support frame. A collection box is fixedly connected to one end of the housing near the outlet. The collection box communicates with the collection cavity. A discharge port is provided on one side of the collection box. The discharge port is connected to a pressure pumping device.

6. The integrated deaeration system for a thermal power plant according to claim 5, characterized in that, The pressure plate has a sloping surface with an inner conical structure. In the initial state, the lowest point of the pressure plate coincides with the lowest point of the notch.

7. The integrated deaeration system for a thermal power plant according to claim 6, characterized in that, The rotating propeller includes a connecting column fixed coaxially with the connecting shaft, and multiple circumferentially distributed blades are fixedly connected to the circumferential side of the connecting column.

8. The integrated deaeration system for a thermal power plant according to claim 7, characterized in that, The two ends of the variable diameter cylinder are internal conical structures, and a connection hole communicating with the external connector is opened in the middle of the variable diameter cylinder.

9. The integrated deaeration system for a thermal power plant according to claim 8, characterized in that, The pressure regulating component includes a knob, a piston rod that slides laterally is coaxially disposed inside the knob, a third elastic element is disposed between the piston rod and the knob, and an elastic plate is installed at the end of the piston rod away from the third elastic element. The elastic plate is located at the junction of the outer flow channel and the inner flow channel.

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