Circulating cooling water quality purification device of indirect air cooling unit

Abstract

The invention relates to the technical field of water purification treatment, in particular to an indirect air cooling unit circulating cooling water quality purification device which comprises a purification cylinder, a filter cylinder assembly, a water inlet pipe assembly, a water outlet pipe assembly, a water inlet pipe assembly and a water outlet pipe assembly. A backwashing assembly; and a scraping assembly. According to the invention, cooling water entering the purification cylinder can be filtered and purified; under the cooperation of the transmission assembly, the central filter cartridge and a plurality of edge filter cartridges which are adjacently distributed on the periphery of the central filter cartridge can be driven to mutually rub and rotate, and meanwhile, the backwashing assembly corresponding to the central filter cartridge and the edge filter purification cartridge parts is implemented; the back washing assembly is operated to carry out back washing on impurities left on the center filter cartridge and the edge filter cartridges, and the two scraping plates attached to the outer walls of the edge filter cartridges are driven to ascend and descend in the vertical direction under transmission of the transmission assembly, so that the external cleaning function is achieved, and overhaul and maintenance are easy.

Description

Technical Field

[0001] The invention relates to the technical field of water purification, and in particular to a circulating cooling water purification device for an indirect air cooling unit. Background Art

[0002] Some power plants often use surface condensing indirect air cooling systems for 2×660MW units. Each unit corresponds to a natural ventilation cooling tower. Each unit's indirect air cooling equipment is equipped with 12 sectors, with a cooling area of ​​1,897,521 square meters and a cooling water volume of 68,500 t / h. The height of the indirect cooling tower is 186m, and the diameter of the X-column at the bottom of the tower is 147m. The inlet water temperature is required to be 62.2℃ and the outlet water temperature is 52℃ under summer operating conditions (ambient temperature 35.5℃), and the turbine reaches rated output.

[0003] However, most of the indirect air-cooling water systems currently use the efficient and water-saving SCAL indirect air-cooling system. On the one hand, because the cooling body is made of metal, it will corrode in the acidic or alkaline water used, resulting in the indirect air-cooling water containing impurities seriously exceeding the standard after commissioning, causing corrosion and leakage of the cooling triangular aluminum tube bundle of the indirect air-cooling system, which has a great impact on the safe operation of the power plant; on the other hand, the application scenario is in an area with strong winds and sand all year round, which makes the indirect air-cooling unit very easy to be seriously polluted.

[0004] The above contents are only used to assist in understanding the technical solution of the present invention, and do not constitute an admission that the above contents are the closest prior art. Summary of the invention

[0005] The object of the present invention is to solve the above-mentioned deficiencies and provide a circulating cooling water purification device for an indirect air-cooling unit.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solution: a water quality purification device for circulating cooling water of an indirect air-cooling unit, comprising a purification cylinder arranged in a cooling water circuit of a surface condenser, a water inlet end for cooling water to enter is arranged on one side of the purification cylinder, and a water outlet end for cooling water to output is arranged on the other side of the purification cylinder, and further comprising:

[0007] A filter cartridge assembly, comprising a central filter cartridge disposed in the inner cavity of the purification cartridge, and a plurality of edge filter cartridges disposed closely to the outer wall of the central filter cartridge, for filtering and purifying cooling water entering the purification cartridge;

[0008] A backwashing assembly, which is correspondingly arranged on the central filter cartridge and the edge filter purification cartridge, and is used for backwashing the supporting cartridge walls on the central filter cartridge and the edge filter cartridge;

[0009] The scraping assembly comprises two scraping plates which are arranged on the outer walls of several edge filter cylinders and are used for scraping and cleaning the impurities retained on the supporting cylinder wall of the edge filter cylinders.

[0010] Furthermore, the backwashing assembly includes a top plate correspondingly arranged on the central filter cylinder and the edge filter cylinder, a "spiral" delivery pipe arranged on the bottom surface of the top plate, a pump body connected to the delivery pipe is arranged on the top plate, an outer gear ring is arranged on the outside of the pump body, a transmission gear is meshed on a horizontal side of the outer gear ring, and an inner gear ring is meshed on the outer side of the transmission gear;

[0011] The inner gear rings are correspondingly arranged on the tops of the central filter cylinder and the edge filter cylinder.

[0012] Furthermore, a transmission assembly is provided at the top of the purification cylinder and corresponding to the central filter cylinder and the edge filter cylinder;

[0013] The transmission assembly includes a connecting column correspondingly arranged on the top of the pump body installed on the central filter cylinder and the edge filter cylinder, a central gear arranged on the connecting column and coaxially distributed with the central filter cylinder, and a plurality of planetary gears meshed on the central gear that are coaxially distributed with the edge filter cylinders.

[0014] Furthermore, the scraping assembly also includes a screw rod arranged on one side of the scraper plate and a guide rod symmetrically arranged on the other side of the scraper plate.

[0015] Furthermore, a belt transmission unit is provided at the top of the screw rod for synchronous movement with the corresponding planetary gear;

[0016] The belt transmission unit comprises a first pulley and a second pulley which are respectively arranged on the central shaft of the planetary gear and the lead screw, and a transmission belt is arranged on the first pulley and the second pulley.

[0017] Furthermore, a discharge pipe for discharging impurities is provided at the bottom end of the purification cylinder.

[0018] Furthermore, the inner cavity of the purification cartridge is provided with a support assembly for independently separating the water inlet end and the water outlet end;

[0019] The support assembly includes vertical blocks vertically arranged on both sides of the connecting surface of the water inlet end and the water outlet end, and a base arranged at the bottom ends of the vertical blocks on both sides. The base is provided with a guide gap for guiding impurities out, and the center point of the guide gap is provided with a confluence outlet connected to the discharge pipe.

[0020] Furthermore, the separated ends of the vertical blocks are respectively provided with mounting grooves for use with the screw rod and the guide rod.

[0021] Furthermore, a plurality of backwash nozzles are evenly arranged on the delivery pipe.

[0022] Compared with the prior art, the present invention has the following beneficial effects: the present invention can filter and purify the cooling water entering the purification cylinder through the filter cylinder assembly to ensure the water quality of the cooling water passing through the purification cylinder installed in the cooling water circuit of the surface condenser and improve the purification effect; and through the backwashing assembly and the scraping assembly, the central filter cylinder and several edge filter cylinders distributed adjacent to the periphery of the central filter cylinder can be driven to rotate by friction with each other under the coordinated cooperation of the transmission assembly, and the backwashing assembly corresponding to the central filter cylinder and the edge filter purification cylinder is implemented at the same time, and the backwashing assembly is operated to backwash the impurities retained on the central filter cylinder and the edge filter cylinder, and the two scraper plates attached to the outer walls of several edge filter cylinders are driven to rise and fall in the vertical direction under the transmission of the transmission assembly, thereby realizing the external cleaning function and simple inspection and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0024] Figure 1 A three-dimensional structural diagram of an overall perspective of an embodiment of the present invention;

[0025] Figure 2 A three-dimensional structural diagram of a cross section of an embodiment of the present invention;

[0026] Figure 3 A three-dimensional structural diagram of the interior of an embodiment of the present invention from a viewing angle;

[0027] Figure 4 Another cross-sectional perspective structural diagram of an embodiment of the present invention;

[0028] Figure 5 for Figure 4 Enlarged structural diagram at A in the middle.

[0029] In the figure: 1. purification cartridge; 2. water inlet end; 3. water outlet end; 4. filter cartridge assembly; 41. center filter cartridge; 42. edge filter cartridge; 5. backwash assembly; 51. top plate; 52. delivery pipe; 53. pump body; 54. outer gear ring; 55. transmission gear; 56. inner gear ring; 6. scraper assembly; 61. scraper plate; 62. screw rod; 63. guide rod; 7. transmission assembly; 71. connecting column; 72. center gear; 73. planetary gear; 74. first pulley; 75. transmission belt; 76. second pulley; 8. discharge pipe; 9. support assembly; 91. vertical block; 92. base; 93. diversion gap; 931. confluence outlet. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0031] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0032] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or schemes that A and B meet at the same time. In addition, "multiple" refers to more than two. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] like Figure 1-5As shown, a water purification device of the present invention is applied to the field of circulating cooling water of an indirect air-cooling unit, comprising a purification cylinder 1 arranged in the cooling water circuit of a surface condenser, wherein one side of the purification cylinder 1 is provided with a water inlet 2 for cooling water to enter, and the other side of the purification cylinder 1 is provided with a water outlet 3 for cooling water to output, and further comprising:

[0034] The filter cartridge assembly 4 includes a central filter cartridge 41 disposed in the inner cavity of the purification cartridge 1 and a plurality of edge filter cartridges 42 disposed closely to the outer wall of the central filter cartridge 41, and is used to filter and purify the cooling water entering the purification cartridge 1;

[0035] The backwashing assembly 5 is correspondingly arranged in the central filter cartridge 41 and the edge filter cartridge 42, and is used for backwashing the supporting cylinder walls of the central filter cartridge 41 and the edge filter cartridge 42;

[0036] The scraping assembly 6 includes two scraping plates 61 which are arranged on the outer walls of the edge filter cylinders 42 and are used to scrape and clean the impurities retained on the supporting cylinder wall of the edge filter cylinders 42 .

[0037] In a specific implementation, by penetrating and connecting the water inlet end 2 welded on one side of the purification cylinder 1 and the water outlet end 3 welded on the other side, the device can be installed in the cooling water circuit of the surface condenser, thereby achieving purification of the cooling water in the circuit;

[0038] The filter cartridge assembly 4 is distributed in the inner cavity of the purification cartridge 1, and the mesh gaps on the outer supporting surfaces of the central filter cartridge 41 and the edge filter cartridge 42 are utilized to effectively isolate impurities and prevent the impurities from being discharged through the filter cartridge assembly 4 and the water outlet 3;

[0039] During the periodic maintenance, the backwashing assembly 5 installed in the central filter cartridge 41 and the edge filter cartridge 42 can be used to perform backwashing and impurity cleaning operations inside the corresponding central filter cartridge 41 and the edge filter cartridge 42, thereby reducing the phenomenon of impurities accumulating and clogging the mesh, ensuring the recycling of the filter cartridge assembly 4, and having a simple structure and a beneficial effect of purifying water quality;

[0040] The external cleaning function is also achieved by installing a scraping assembly 6 that is vertically movable and fits on the outer walls of several edge filter cartridges 42. The backwashing assembly 5 is used in conjunction with the central filter cartridge 41 and the edge filter cartridge 42 included in the filter cartridge assembly 4. The inspection and maintenance are simple, no disassembly of the machine is required for maintenance, and the efficiency is high.

[0041] It should be noted that the filter cartridge assembly 4 includes a central filter cartridge 41 and an edge filter cartridge 42, and the filters, fillers and resins sequentially arranged from the outside to the inside can not only filter out large particles of impurities and suspended particles such as dust contained in the cooling water, but also can remove hardness ions in the cooling water, reduce the hardness of the water and prevent scaling.

[0042] Preferably, the filter is a polypropylene filter, the filler is a diatomaceous earth filler, and the resin is a macroporous mixed bed anion exchange resin.

[0043] Preferably, the filter cartridge assembly 4 in the purification cartridge 1 adopts a separate assembly structure, which can be conveniently installed and removed, thereby improving the convenience of maintaining the filter cartridge assembly 4.

[0044] In one embodiment, the backwash assembly 5 includes a top plate 51 correspondingly arranged on the central filter cartridge 41 and the edge filter cartridge 42, a spiral-shaped delivery pipe 52 arranged on the bottom surface of the top plate 51, a pump body 53 connected to the delivery pipe 52 is arranged on the top plate 51, an outer gear ring 54 is arranged on the outside of the pump body 53, a transmission gear 55 is meshed on a horizontal side of the outer gear ring 54, and an inner gear ring 56 is meshed on the outer side of the transmission gear 55;

[0045] The inner gear ring 56 is correspondingly arranged on the top of the central filter cartridge 41 and the edge filter cartridge 42. With this design, through the delivery pipe 52 welded on the bottom surface of the top plate 51 and the pump body 53 bolted on the top plate 51 and connected to the delivery pipe 52, when the external shell of the pump body 53 applies a rotational external force, the generated rotational force will be transmitted through the outer gear ring 54 welded on the outside thereof, and the transmission gear 55 meshingly connected on the outside of the outer gear ring 54 and the inner gear ring 56 meshingly connected on the outside of the transmission gear 55, so that the delivery pipe 52 welded on the bottom surface of the top plate 51 and the central filter cartridge 41 or the edge filter cartridge 42 can rotate independently, and then the mesh impurities on the outer wall of the central filter cartridge 41 or the edge filter cartridge 42 can be backwashed through the delivery pipe 52, and the cleaning effect is good.

[0046] It should be noted that an interface for connecting to an external water source is installed at one end of the outer shell of the pump body 53 .

[0047] It should be noted that the open inner wall machined on the top of the central filter cylinder 41 or the edge filter cylinder 42 can be welded and fixed to the inner gear ring 56 .

[0048] In one embodiment, a transmission assembly 7 is provided at the top of the purification cartridge 1 and corresponds to the central filter cartridge 41 and the edge filter cartridge 42;

[0049] The transmission assembly 7 includes a connecting column 71 correspondingly arranged on the top of the pump body 53 installed on the central filter cylinder 41 and the edge filter cylinder 42, a central gear 72 arranged on the connecting column 71 and coaxially distributed with the central filter cylinder 41, and a plurality of planetary gears 73 coaxially distributed with the edge filter cylinder 42 are meshed on the central gear 72. In this design, a connecting column 71 is welded at the center of the top outside of the pump body 53 installed on the central filter cylinder 41 and the edge filter cylinder 42, and a central gear 72 coaxially distributed with the central filter cylinder 41 and a planetary gear 73 meshing with the central gear 72 and coaxially installed with the edge filter cylinder 42 are installed on the connecting column 71. Once the central gear 72 receives power, it will drive the central filter cylinder 41 coaxially distributed with the central gear 72 and the backwashing assembly 5 installed on the top of the central filter cylinder 41, while driving the edge filter cylinder 42 coaxially distributed with the planetary gear 73 and the backwashing assembly 5 installed on the top of the edge filter cylinder 42 to rotate, thereby achieving a synchronous motion driving effect, and then achieving mutual squeezing and friction between several edge filter cylinders 42 adjacent and tightly attached to the central filter cylinder 41, thereby assisting in achieving the external cleaning function.

[0050] It should be noted that a driving motor is installed at the top center of the central gear 72 to provide a rotational driving force.

[0051] In one embodiment, the scraping assembly 6 further includes a screw rod 62 disposed on one side of the scraping plate 61 and a guide rod 63 symmetrically disposed on the other side of the scraping plate 61. In this design, through the two scraping plates 61 attached to the outer walls of the edge filter cartridges 42, and the screw rod 62 with internal threads machined on one side of the two scraping plates 61 and the guide rod 63 with sliding limit in the guide groove machined on the other side, when the screw rod 62 is subjected to a force, the rotation of the screw rod 62 will drive the scraping plate 61 with threads thereof to perform vertical linear motion under the guidance of the guide rod 63 on the other side, thereby realizing the external cleaning function.

[0052] It should be noted that cleaning bristles are installed on the surface of the scraper plate 61 that contacts the edge filter cartridge 42 .

[0053] In one embodiment, a belt transmission unit is provided on the top of the screw rod 62 for synchronous movement with the corresponding planetary gear 73;

[0054] The belt transmission unit includes a first pulley 74 and a second pulley 76 respectively arranged on the central axis of the planetary gear 73 and the screw rod 62, and a transmission belt 75 is arranged on the first pulley 74 and the second pulley 76. In this design, the second pulley 76 sleeved on the top of the screw rod 62 and the first pulley 74 sleeved on the central axis of the corresponding planetary gear 73, and the transmission belt 75 horizontally wound around the first pulley 74 and the second pulley 76 can transmit the rotational force of the corresponding planetary gear 73 to the screw rod 62, thereby realizing the driving effect of the vertical movement of the scraper plate 61.

[0055] In one embodiment, a discharge pipe 8 for discharging impurities is provided at the bottom end of the purification cylinder 1. With this design, the discharge pipe 8 connected to the inner cavity of the purification cylinder 1 is welded at the bottom end of the purification cylinder 1, and after closing the pipeline control valves installed on the water inlet end 2 and the water outlet end 3, the pipeline control valve connected to the discharge pipe 8 is opened, so that the filter cylinder assembly 4 installed inside the purification cylinder 1 can be cleaned and maintained regularly, and the cleaned impurities can be discharged through the discharge pipe 8, without disassembling the machine for maintenance, and the operation is simple.

[0056] In one embodiment, the inner cavity of the purification cartridge 1 is provided with a support assembly 9 for independently separating the water inlet end 2 and the water outlet end 3;

[0057] The support assembly 9 includes vertical blocks 91 vertically arranged on both sides of the connection surface of the water inlet end 2 and the water outlet end 3, and a base 92 arranged at the bottom of the vertical blocks 91 on both sides. The base 92 is provided with a guide gap 93 for the impurity discharge, and the center point of the guide gap 93 is provided with a confluence port 931 connected to the discharge pipe 8. In this design, through the vertical blocks 91 on both sides of the inner cavity of the purification cylinder 1 and perpendicular to the connection surface of the water inlet end 2 and the water outlet end 3, and the base 92 welded at the bottom of the vertical blocks 91 on both sides, on the one hand, the inner cavity of the purification cylinder 1 can be independently separated, so that the water inlet area and the water outlet area are placed in two independent areas, ensuring the cooling water purification effect in and out of the purification cylinder 1. On the other hand, at the guide gap 93 machined on the base 92, the inner guide slope of the guide gap 93 is used to make the scraped impurities converge along the slope and enter the confluence port 931 formed in one piece at the center point of the guide gap 93 and connected to the discharge pipe 8, thereby achieving the effect of concentrated output of impurities.

[0058] It should be noted that the top surface of the base 92 is rotatably mounted with the corresponding central filter cartridge 41 and edge filter cartridge 42 .

[0059] In one embodiment, the ends of the vertical block 91 are respectively provided with mounting grooves for use with the screw rod 62 and the guide rod 63. In this design, the two mounting grooves are machined on the ends of the vertical block 91, and the screw rod 62 and the guide rod 63 are vertically installed in the two mounting grooves, which provides installation space and provides effective support.

[0060] In one embodiment, a plurality of backwash nozzles are evenly arranged on the delivery pipe 52. With this design, the backwash nozzles are connected and installed in a plurality of evenly arranged grooves machined on the delivery pipe 52. When the delivery pipe 52 is subjected to a rotational force, the evenly arranged backwash nozzles are driven to perform even backwash jet operations in the corresponding central filter cartridge 41 or edge filter cartridge 42 to flush impurities and prevent impurities from accumulating at the mesh and causing blockage.

[0061] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

Claims

1. A water purification device for circulating cooling water of an indirect air-cooling unit, comprising a purification cylinder (1) arranged in a cooling water circuit of a surface condenser, wherein one side of the purification cylinder (1) is provided with a water inlet (2) for cooling water to enter, and the other side of the purification cylinder (1) is provided with a water outlet (3) for cooling water to output, characterized in that: Also includes: A filter cartridge assembly (4) comprising a central filter cartridge (41) disposed in the inner cavity of the purification cartridge (1), and a plurality of edge filter cartridges (42) disposed in close proximity to the outer wall of the central filter cartridge (41), for filtering and purifying cooling water entering the purification cartridge (1); A backwashing assembly (5), which is correspondingly arranged in the central filter cylinder (41) and the edge filter cylinder (42), and is used to perform a backwashing operation on the supporting cylinder walls of the central filter cylinder (41) and the edge filter cylinder (42); The scraping assembly (6) comprises two scraping plates (61) which are arranged on the outer walls of a plurality of edge filter cylinders (42) and are used to scrape and clean impurities retained on the supporting cylinder wall of the edge filter cylinder (42).

2. The circulating cooling water purification device for an indirect air-cooling unit according to claim 1 is characterized in that: The backwashing assembly (5) comprises a top plate (51) correspondingly arranged on the central filter cylinder (41) and the edge filter cylinder (42), a spiral-shaped delivery pipe (52) arranged on the bottom surface of the top plate (51), a pump body (53) connected to the delivery pipe (52) arranged on the top plate (51), an outer gear ring (54) arranged outside the pump body (53), a transmission gear (55) meshed on a horizontal side of the outer gear ring (54), and an inner gear ring (56) meshed on the outer side of the transmission gear (55); The inner gear ring (56) is correspondingly arranged on the top of the central filter cylinder (41) and the edge filter cylinder (42).

3. The circulating cooling water purification device for an indirect air-cooling unit according to claim 2 is characterized in that: A transmission assembly (7) is provided at the top of the purification cylinder (1) and corresponding to the central filter cylinder (41) and the edge filter cylinder (42); The transmission assembly (7) comprises a connecting column (71) arranged on the top of the pump body (53) mounted on the central filter cylinder (41) and the edge filter cylinder (42), and a central gear (72) arranged on the connecting column (71) and coaxially distributed with the central filter cylinder (41); and a plurality of planetary gears (73) respectively coaxially distributed with the edge filter cylinders (42) are meshed on the central gear (72).

4. The circulating cooling water purification device for an indirect air-cooling unit according to claim 3 is characterized in that: The scraping assembly (6) further comprises a screw rod (62) arranged on one side of the scraping plate (61) and a guide rod (63) symmetrically arranged on the other side of the scraping plate (61).

5. The circulating cooling water purification device for an indirect air-cooling unit according to claim 4 is characterized in that: A belt transmission unit is provided at the top of the screw rod (62) for synchronous movement with the corresponding planetary gear (73); The belt transmission unit comprises a first pulley (74) and a second pulley (76) which are respectively arranged on the central axis of the planetary gear (73) and the screw rod (62), and a transmission belt (75) is arranged on the first pulley (74) and the second pulley (76).

6. The circulating cooling water purification device for an indirect air-cooling unit according to claim 4 is characterized in that: The bottom end of the purification cylinder (1) is provided with a discharge pipe (8) for discharging impurities.

7. The circulating cooling water purification device for an indirect air-cooling unit according to claim 6, characterized in that: The inner cavity of the purification cartridge (1) is provided with a support assembly (9) for independently separating the water inlet end (2) and the water outlet end (3); The support assembly (9) comprises vertical blocks (91) vertically arranged on both sides of the connection surface of the water inlet end (2) and the water outlet end (3), and bases (92) arranged at the bottom ends of the vertical blocks (91) on both sides, and a guide gap (93) for guiding impurities is arranged on the base (92), and a converging flow outlet (931) connected to the discharge pipe (8) is arranged at the center point of the guide gap (93).

8. The circulating cooling water purification device for an indirect air-cooling unit according to claim 7, characterized in that: The separated ends of the vertical block (91) are respectively provided with mounting grooves for use with the screw rod (62) and the guide rod (63).

9. The circulating cooling water purification device for an indirect air-cooling unit according to claim 2, characterized in that: A plurality of backwash nozzles are evenly arranged on the delivery pipe (52).

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