A descaling device for an external cooling water system of a direct current converter station

Abstract

The application discloses a descaling device of a DC converter station outer cold water system, which comprises a first pipe body and a second pipe body, the first pipe body and the second pipe body are communicated through two U-shaped branch pipes, the two U-shaped branch pipes are symmetrically arranged, and the opposite surfaces of the first pipe body and the second pipe body are sealingly arranged; a scale inhibition and removal mechanism, the scale inhibition and removal mechanism comprises a pulse scale inhibition and removal device body arranged on the first pipe body, the pulse scale inhibition and removal device body is mounted on the first pipe body through a plurality of bands, an indicating lamp is mounted on the upper end of the pulse scale inhibition and removal device body, and an input power cable is mounted on the upper end of the pulse scale inhibition and removal device body. In the process of using the device, scale inhibition and removal can be realized without adding liquid medicine, so that the subsequent maintenance cost of the device is reduced, the influence on the environment is reduced, and the operation cost is also reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of pipeline descaling, in particular to a descaling device for an external cooling water system of a direct current converter station. BACKGROUND

[0002] The external cooling water system of an extra-high voltage direct current converter station is an important component of a direct current transmission project. The raw water quality of the external cooling water system of a direct current converter station is generally poor in China. The pipes and cooling towers of the external cooling system are seriously scaled. The operation and management of the external cooling water system of a converter station mainly have the following problems at present.

[0003] 1. The scaling of the cooling tower coil of the external cooling water system seriously reduces the heat transfer coefficient of the cooling equipment, affects the heat dissipation capacity of the external cooling water system, and causes the scaling of the metal equipment to form a concentration cell on the surface of the metal equipment, thereby causing corrosion of the metal under the scale and affecting the service life of the cooling tower. The pH value, water temperature, light and nutrient components are conducive to the reproduction of microorganisms and algae, which makes the circulating water turbid and smelly, forms a sticky mud to block the heat exchange elements, reduces the cooling effect of the cooling water, and increases the operation cost.

[0004] 2. The scaling of the cooling tower coil of the external cooling water system increases the energy consumption of the cooling system, causing unnecessary loss of electric energy.

[0005] 3. The descaling and cleaning work carried out during the annual maintenance increases the maintenance time, which indirectly affects the annual availability of the direct current transmission project.

[0006] 4. The pipe filter membrane system and the chemical dosing system are mainly used in domestic converter stations to solve the scaling problem of the external cooling system. The annual cost of consumables is high. The pipe filter membrane treatment capacity of the external cooling water system of the converter station is generally insufficient. The water quality is polluted after adding chemical agents. In combination with the requirements of the environmental protection law for direct discharge of waste water, the waste water treatment and discharge of the external cooling water after adding chemicals has become a new problem faced by enterprises. Improper waste water treatment directly affects the social image of enterprises. SUMMARY

[0007] The purpose of the present application is to solve the problems in the prior art. The descaling device for the external cooling water system of a direct current converter station can perform descaling and scale inhibition without adding liquid chemicals during use, thereby reducing the subsequent maintenance cost of the device, reducing the impact on the environment, and reducing the operation cost.

[0008] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0009] The application discloses a descaling device of an outer cold water system of a direct current converter station, which comprises a first pipe body and a second pipe body, the first pipe body and the second pipe body are communicated through two U-shaped branch pipes, the two U-shaped branch pipes are symmetrically arranged, and the opposite surfaces of the first pipe body and the second pipe body are sealingly arranged; a scale inhibition and removal mechanism, the scale inhibition and removal mechanism comprises a pulse scale inhibition and removal device body arranged on the first pipe body, the pulse scale inhibition and removal device body is mounted on the first pipe body through a plurality of belts, an indicating lamp is mounted at the upper end of the pulse scale inhibition and removal device body, an input power cable is mounted at the upper end of the pulse scale inhibition and removal device body, a coupler is mounted on the outer side of the first pipe body, the coupler comprises a plurality of coupling bodies and a plurality of limiting screws, and the coupler is electrically connected with the pulse scale inhibition and removal device body through a pulse output cable; a rectangular box is fixedly connected to the upper end of the first pipe body, and an adjusting mechanism is arranged in the rectangular box; and two resistance trigger mechanisms are arranged in the vertical portions of the two U-shaped branch pipes respectively.

[0010] Preferably, the adjusting mechanism comprises a sliding plate slidingly connected in the rectangular box, an electromagnet is mounted on the left inner wall of the rectangular box, the electromagnet is elastically connected with the sliding plate through a second spring, and a rack is fixedly connected to the right side of the sliding plate.

[0011] Preferably, a rotating shaft is rotatably connected to the upper end of the rectangular box, the upper end of the rotating shaft extends to the inner bottom of the second pipe body, the lower end of the rotating shaft penetrates through the rectangular box and extends to the inner top of the first pipe body, a gear is mounted on the rotating shaft in the rectangular box through a one-way bearing, and the gear is engaged with the rack.

[0012] Preferably, rotating plates are fixedly connected to the upper end and the lower end of the rotating shaft respectively, and arc-shaped sealing plates are fixedly connected to the opposite sides of the two rotating plates respectively.

[0013] Preferably, the arc-shaped sealing plate located at the upper side is attached to the inner wall of the second pipe body, and the arc-shaped sealing plate located at the lower side is attached to the inner wall of the first pipe body.

[0014] Preferably, the resistance trigger mechanism comprises a mounting strip horizontally fixedly connected in the U-shaped branch pipe, a filter screen sliding up and down is arranged in the U-shaped branch pipe, the filter screen is elastically connected with the lower end of the mounting strip through a first spring, a hollow cylinder is fixedly connected to the lower end of the mounting strip, a cavity is arranged in the hollow cylinder, an elastic bag is fixedly connected to the lower end of the hollow cylinder, the inner top of the elastic bag is communicated with the cavity through a connecting pipe, a conductive piston sliding up and down is arranged in the cavity, a touch delay switch is mounted on the inner top of the cavity, and the space of the inner top of the cavity is communicated with the outside through a ventilation pipe.

[0015] Preferably, the upper end of the rectangular box is provided with an alarm, the sliding plate is magnetic, the electromagnet repels the adjacent surface of the sliding plate after being electrified, the alarm is in series with the electromagnet, and the two touch delay switches are connected in parallel to the series circuit of the alarm and the electromagnet.

[0016] Preferably, the lower end of the lower horizontal part of each U-shaped branch pipe is communicated with a liquid outlet pipe, and the lower end of each liquid outlet pipe is provided with a sealing cover.

[0017] Compared with the prior art, the present application has the following beneficial effects:

[0018] 1. The pulse scale-inhibiting and scale-removing device body is arranged, electric pulses are coupled into the outer cooling water in the pipeline, the scale-forming cations and acid root ions in the outer cooling water are quickly crystallized, the crystallization is suspended in the water and does not adhere to the surface of the heat exchange element, the scale inhibition of the outer cooling water equipment can be realized, compared with the prior art, the scale inhibition can be realized without adding chemical agents, the influence on the environment is reduced, subsequent maintenance and repair are facilitated, and the annual availability of the direct current power transmission project is improved.

[0019] 2. After the electric pulse scale-inhibiting and scale-removing device is installed, the trace carbon dioxide and carbonates in the outer cooling water can be reacted under the action of the electric pulses to generate soluble bicarbonates, and the old scale on the heat exchange element can be removed.

[0020] 3. Two U-shaped branch pipes are arranged, the cooperation of the two filter screens can gather more impurities at the filter screen, another U-shaped branch pipe is used for work, the worker is reminded during replacement, and the normal operation of the water-cooled heat exchange is not affected during the whole replacement process.

[0021] 4. When the replacement is performed, the resistance of the filter screen used for filtering disappears, most of the scale and impurities move downward under the action of gravity, the filter screen is shaken multiple times and finally stops moving under the elastic action of the first spring and the inertia of the filter screen, the scale and crystallization closely adhered to the lower end of the filter screen are separated during the shaking of the filter screen, and the separation of the impurities on the filter screen is more comprehensive. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structural schematic view of a scale-removing device of an outer cooling water system of a direct current converter station.

[0023] Figure 2 It is an enlarged view of a connecting part of the first pipe body and the second pipe body.

[0024] Figure 3 It is Figure 2 a sectional view.

[0025] Figure 4 It is Figure 3enlarged view of A in Fig.

[0026] Figure 5 is Figure 3 enlarged view of B in Fig.

[0027] Figure 6 is a sectional view of one of the hollow cylinders connected to the elastic bag.

[0028] In the figure: 1 first pipe body, 2 second pipe body, 3 U-shaped branch pipe, 4 liquid outlet pipe, 5 rotating shaft, 6 rectangular box, 7 alarm, 8 pulse scale removal device body, 9 binding belt, 10 input power cable, 11 indicator light, 12 pulse output cable, 13 coupler, 14 limit screw, 15 sealing cover, 16 rotating plate, 17 arc-shaped sealing plate, 18 mounting strip, 19 hollow cylinder, 20 elastic bag, 21 first spring, 22 filter screen, 23 cavity, 24 connecting pipe, 25 gear, 26 touch delay switch, 27 conductive piston, 28 ventilation pipe, 29 sliding plate, 30 electromagnet, 31 second spring. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

[0030] Referring to Figures 1-6 A scale removal device of a direct current converter station external cooling water system, comprising a first pipe body 1 and a second pipe body 2, the first pipe body 1 and the second pipe body 2 are communicated through two U-shaped branch pipes 3, the two U-shaped branch pipes 3 are symmetrically arranged, and the opposite surfaces of the first pipe body 1 and the second pipe body 2 are both sealingly arranged;

[0031] As an embodiment of the present application, the scale removal device further comprises a scale removal mechanism, the scale removal mechanism comprises a pulse scale removal device body 8 arranged on the first pipe body 1, the pulse scale removal device body 8 is mounted on the first pipe body 1 through a plurality of binding belts 9, an indicator light 11 is mounted on the upper end of the pulse scale removal device body 8, an input power cable 10 is mounted on the upper end of the pulse scale removal device body 8, a coupler 13 is mounted on the outer side of the first pipe body 1, the coupler 13 comprises a plurality of coupling bodies and a plurality of limit screws 14, and the coupler 13 is electrically connected with the pulse scale removal device body 8 through a pulse output cable 12;

[0032] As one of the embodiments of the present application, the rectangular box 6 is fixedly connected to the upper end of the first pipe body 1, an adjusting mechanism is arranged in the rectangular box 6, the adjusting mechanism comprises a sliding plate 29 which is slidingly connected in the rectangular box 6, an electromagnet 30 is mounted on the left inner wall of the rectangular box 6, the electromagnet 30 is elastically connected with the sliding plate 29 through a second spring 31, the right side of the sliding plate 29 is fixedly connected with a rack, the upper end of the rectangular box 6 is rotatably connected with a rotating shaft 5, the upper end of the rotating shaft 5 extends to the inner bottom of the second pipe body 2, the lower end of the rotating shaft 5 penetrates through the rectangular box 6 and extends to the inner top of the first pipe body 1, rotating sealing pads are mounted at the positions where the rotating shaft 5 penetrates through the first pipe body 1 and the second pipe body 2, the part of the rotating shaft 5 located in the rectangular box 6 is mounted with a gear 25 through a one-way bearing, the gear 25 is engaged with the rack, through the use of the one-way bearing, when the rack moves right, the gear 25 will be driven to rotate, while when the rack moves left, the gear 25 will not be driven to rotate, the upper end and the lower end of the rotating shaft 5 are fixedly connected with rotating plates 16, the opposite sides of the two rotating plates 16 are fixedly connected with arc-shaped sealing plates 17, the arc-shaped sealing plate 17 located at the upper side is attached to the inner wall of the second pipe body 2, the arc-shaped sealing plate 17 located at the lower side is attached to the inner wall of the first pipe body 1;

[0033] As one of the embodiments of the present application, two resistance trigger mechanisms are arranged in the vertical parts of the two U-shaped branch pipes 3 respectively, the resistance trigger mechanism comprises a mounting strip 18 which is horizontally fixedly connected in the U-shaped branch pipe 3, a filter screen 22 which can slide up and down is arranged in the U-shaped branch pipe 3, the filter screen 22 is elastically connected with the lower end of the mounting strip 18 through a first spring 21, the lower end of the mounting strip 18 is fixedly connected with a hollow cylinder 19, the inside of the hollow cylinder 19 is provided with a cavity 23, the lower end of the hollow cylinder 19 is fixedly connected with an elastic bag 20, the inner top of the elastic bag 20 is communicated with the cavity 23 through a connecting pipe 24, the cavity 23 is provided with a conductive piston 27 which can slide up and down, the inner top of the cavity 23 is mounted with a touch delay switch 26, after the touch delay switch 26 is triggered, the energized element will be energized for a period of time and then automatically turned off, the space of the inner top of the cavity 23 is communicated with the outside through a ventilation pipe 28;

[0034] As one of the embodiments of the present application, the upper end of the rectangular box 6 is mounted with an alarm 7, the sliding plate 29 has magnetism, the adjacent surfaces of the electromagnet 30 and the sliding plate 29 repel each other after the electromagnet 30 is energized, the alarm 7 and the electromagnet 30 are in a series circuit, the two touch delay switches 26 are connected in parallel into the series circuit of the alarm 7 and the electromagnet 30, the lower end of the lower horizontal part of each U-shaped branch pipe 3 is communicated with a liquid outlet pipe 4, the lower end part of each liquid outlet pipe 4 is mounted with a sealing cover 15.

[0035] In the present application, when in use, the first pipe body 1, the right U-shaped branch pipe 3 and the second pipe body 2 are all communicated with the outside cold water channel (and as shown in the figure, the right U-shaped branch pipe 3 is also communicated with the outside cold water channel) Figure 1As shown, the water body in the flow channel moves from bottom to top), heat exchange cooling is achieved, in the process, the pulse scale inhibition and removal device body 8 is started, the electric pulse is directionally coupled to the outer cooling water in the pipeline, the scale-forming cations (calcium ions, magnesium ions, etc.) in the outer cooling water are quickly crystallized with the acid radical ions (carbonate ions), the crystallization is suspended in the water without adhering to the surface of the heat exchange element, that is, the scale inhibition of the outer cooling water equipment can be achieved. If the scale (calcium carbonate or magnesium carbonate) has adhered to the surface of the heat exchange element during the operation of the outer cooling water equipment, after the installation of the pulse scale inhibition and removal device body 8, the trace carbon dioxide in the outer cooling water can be reacted with the carbonate under the action of the electric pulse to generate soluble bicarbonate, and the old scale on the heat exchange element is removed.

[0036] In the above process, in the initial state, the right U-shaped branch pipe 3 is in a conductive state, and the crystallization and removed scale in the water body is filtered at the right filter screen 22. As the impurities increase, the resistance of the filter screen 22 to the water flow impact increases, so that the filter screen 22 continuously moves upward. When a large amount of impurities are accumulated, the filter screen 22 moves upward to contact the elastic bag 20 and compresses the elastic bag 20. After the elastic bag 20 is compressed, the gas is pressed into the cavity 23, pushing the conductive piston 27 to move upward, so that the conductive piston 27 contacts the touch delay switch 26. At this time, the electromagnet 30 and the alarm 7 are energized for a period of time and automatically turned off. After the electromagnet 30 is energized, it pushes the sliding plate 29 to move rightward. The rightward movement of the sliding plate 29 makes the rack move rightward and rotates the gear 25. After the rack moves rightward to the maximum position, the gear 25 just rotates 180°. In this way, the whole formed by the rotating shaft 5, the two rotating plates 16 and the two arc-shaped sealing plates 17 rotates 180°. At this time, the right U-shaped branch pipe 3 is sealed, and the left U-shaped branch pipe 3 is conductive.

[0037] At this time, the right U-shaped branch pipe 3 has no liquid flow, and the resistance of the right filter screen 22 disappears. Most of the scale and impurities move downward under the elastic action of the first spring 21 and the inertia of the filter screen 22. The filter screen 22 shakes multiple times and finally stops moving. When the filter screen 22 shakes, the scale and crystallization adhered to the lower end of the filter screen 22 are separated. At this time, the staff only needs to open the sealing cover 15 on the right liquid outlet pipe 4. The shaken scale and crystallization are finally discharged with the water flow from the liquid outlet pipe 4 to the outside, completing the whole self-cleaning process, and the self-cleaning process does not affect the overall water cooling operation.

[0038] In addition, it should be noted that the use of the alarm 7 can remind the staff to discharge the waste water. When the left side accumulates a large amount of impurities, the above process is repeated.

[0039] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art, according to the technical solution and inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A descaling device for an external cooling water system of a direct current converter station, characterized in that Include: The first pipe body (1) and the second pipe body (2) are communicated by two U-shaped branch pipes (3), the two U-shaped branch pipes (3) are symmetrically arranged, and the opposite surfaces of the first pipe body (1) and the second pipe body (2) are sealingly arranged; The scale inhibition and removal mechanism includes a pulse scale inhibition and removal device body (8) arranged on the first pipe body (1), the pulse scale inhibition and removal device body (8) is installed on the first pipe body (1) by a plurality of straps (9), the upper end of the pulse scale inhibition and removal device body (8) is provided with an indicating lamp (11), the upper end of the pulse scale inhibition and removal device body (8) is provided with an input power cable (10), the outer side of the first pipe body (1) is provided with a coupler (13), the coupler (13) includes a plurality of coupling bodies and a plurality of limiting screws (14), the coupler (13) is electrically connected with the pulse scale inhibition and removal device body (8) through a pulse output cable (12); A rectangular box (6) is fixedly connected to the upper end of the first pipe body (1), and an adjusting mechanism is arranged in the rectangular box (6); Two resistance trigger mechanisms are arranged in the vertical portions of the two U-shaped branch pipes (3) respectively; The adjusting mechanism includes a sliding plate (29) slidingly connected in the rectangular box (6), an electromagnet (30) is arranged on the left inner wall of the rectangular box (6), the electromagnet (30) is elastically connected with the sliding plate (29) through a second spring (31), and the right side of the sliding plate (29) is fixedly connected with a rack; A rotating shaft (5) is rotatably connected to the upper end of the rectangular box (6), the upper end of the rotating shaft (5) extends to the inner bottom of the second pipe body (2), the lower end of the rotating shaft (5) penetrates through the rectangular box (6) and extends to the inner top of the first pipe body (1), and the portion of the rotating shaft (5) in the rectangular box (6) is provided with a gear (25) through a one-way bearing, and the gear (25) is engaged with the rack; The resistance trigger mechanism includes a mounting strip (18) fixedly connected horizontally in the U-shaped branch pipe (3), a filter screen (22) sliding up and down is arranged in the U-shaped branch pipe (3), the lower end of the mounting strip (18) is elastically connected with the filter screen (22) through a first spring (21), the lower end of the mounting strip (18) is fixedly connected with a hollow cylinder (19), the inside of the hollow cylinder (19) is provided with a cavity (23), the lower end of the hollow cylinder (19) is fixedly connected with an elastic bag (20), the inner top of the elastic bag (20) is communicated with the cavity (23) through a connecting pipe (24), the cavity (23) is provided with a conductive piston (27) sliding up and down, the inner top of the cavity (23) is provided with a touch delay switch (26), and the space of the inner top of the cavity (23) is communicated with the outside through a ventilation pipe (28).

2. A descaling device for an external cooling water system of a direct current converter station according to claim 1, characterized in that The upper end and the lower end of the rotating shaft (5) are fixedly connected with rotating plates (16), and the opposite sides of the two rotating plates (16) are fixedly connected with arc-shaped sealing plates (17).

3. A descaling device for an external cooling water system of a direct current converter station according to claim 2, characterized in that The upper arc-shaped sealing plate (17) is attached to the inner wall of the second pipe body (2), and the lower arc-shaped sealing plate (17) is attached to the inner wall of the first pipe body (1).

4. A descaling device for an external cooling water system of a direct current converter station according to claim 3, characterized in that The upper end of the rectangular box (6) is provided with an alarm (7), the sliding plate (29) is magnetic, the electromagnet (30) repels the adjacent surface of the sliding plate (29) after being electrified, the alarm (7) and the electromagnet (30) are in a series loop, and the two touch delay switches (26) are connected in parallel into the series loop of the alarm (7) and the electromagnet (30).

5. A descaling device for an external cooling water system of a direct current converter station according to claim 4, characterized in that The lower end of the lower horizontal part of each U-shaped branch pipe (3) is communicated with a liquid outlet pipe (4), and the lower end of each liquid outlet pipe (4) is provided with a sealing cover (15).

Images