CN220270214U

CN220270214U - Nuclear power station plate heat exchanger belt cleaning device

Info

Publication number: CN220270214U
Application number: CN202321986884.3U
Authority: CN
Inventors: 赵笑苹; 朱从政
Original assignee: Shenzhen Dongang Kexing Technology Co ltd
Current assignee: Shenzhen Dongang Kexing Technology Co ltd
Priority date: 2023-07-26
Filing date: 2023-07-26
Publication date: 2023-12-29
Anticipated expiration: 2033-07-26

Abstract

The utility model belongs to the technical field of nuclear power station equipment maintenance, and particularly relates to a cleaning device for a plate heat exchanger of a nuclear power station, which comprises a mobile trolley, a box body provided with an inner space, a high-pressure pump, a liquid tank and a purging device, wherein the high-pressure pump, the liquid tank and the purging device are all arranged in the inner space; the box body is arranged on the mobile trolley; the box body is also provided with a first interface communicated with the outlet of the high-pressure pump, the inlet of the high-pressure pump is communicated with the liquid tank, and the liquid tank is provided with a medicine adding port; the first interface is detachably connected with a cleaning inlet of the plate heat exchanger to be cleaned; the box body is also provided with a second interface communicated with the purging device, and the purging device is detachably connected with a cleaning inlet of the plate heat exchanger to be cleaned through the second interface. According to the utility model, the plate heat exchanger to be cleaned does not need to be disassembled, and the plate heat exchanger can be cleaned on line, so that the cleaning efficiency of the plate heat exchanger is improved, and the cleaning workload of the plate heat exchanger is reduced.

Description

Nuclear power station plate heat exchanger belt cleaning device

Technical Field

The utility model belongs to the technical field of nuclear power station equipment maintenance, and particularly relates to a cleaning device for a plate heat exchanger of a nuclear power station.

Background

The plate heat exchanger mainly comprises a plate, a sealing gasket, a fixed end socket, a movable end socket, a clamping bolt, a hanger guide rail, a strut and the like, and has the advantages of compact volume, high heat transfer efficiency and the like. Thin rectangular channels are formed between the various plates through which heat is exchanged. The plate heat exchanger is ideal equipment for liquid-liquid and liquid-vapor heat exchange. The heat exchanger has the characteristics of high heat exchange efficiency, small heat loss, compact and light structure, small occupied area, wide application, long service life and the like. Under the same pressure loss, the heat transfer coefficient is 3-5 times higher than that of the tubular heat exchanger, the occupied area is one third of that of the tubular heat exchanger, and the heat recovery rate can be up to more than 90%.

However, various problems in the use of plate heat exchangers have also had a serious impact on production, for a number of reasons, which are related to various aspects of design, use, maintenance and servicing. For example, clogging problems: the flow channel clearance of the plate heat exchanger is smaller (2.5-6 mm), and particle sundries with the diameter larger than 1.5-3 mm are easy to block the plate channel, so that the pressure drop of the equipment is rapidly deteriorated, the heat exchange capacity of the equipment is greatly reduced due to blockage, and the continuous production of the device is seriously interrupted. Scaling problem: fouling can lead to a reduction in the heat transfer coefficient of the heat transfer device and, in severe cases, can also plug the plate channels. The plate sheet of the plate heat exchanger is designed with a large number of supporting points, which aims to play a role of turbulence (turbulence of the medium to improve the heat transfer coefficient) and pressure bearing on the medium, is a place where solid sundries and fibers are easy to gather, and has the side effect that the fluid forms local stagnation to generate dirt accumulation tumor, and calcium and magnesium ions in the medium are easy to attach and grow on the accumulation tumor after being precipitated at a proper temperature to form a honeycomb dirt sample. Although clogging and fouling are different in origin, the effect on the plate heat exchanger is the same.

Plate heat exchangers are also required in many places of the nuclear power plant, for example, the plate heat exchangers are more common in the conventional island and nuclear island nuclear reactions, and as certain nuclear radiation is usually carried in a heat exchange medium of the nuclear power plant, the tightness requirements of the nuclear power plant on the nuclear power plate heat exchangers are more strict.

The nuclear power station needs to be subjected to unscheduled maintenance, so that the probability of faults in the use of the plate heat exchanger can be effectively reduced, the running period of equipment is prolonged, the advantages of high efficiency and energy conservation of the plate heat exchanger are fully exerted, and better economic benefits are obtained for companies.

However, the existing maintenance is generally carried out by adopting a mode of cleaning after disassembly, and the mode of disassembly and cleaning has the problems of low cleaning efficiency and poor sealing performance of the plate heat exchanger caused by frequent disassembly.

Disclosure of Invention

Aiming at the technical problems of low cleaning efficiency and poor sealing performance in disassembly and cleaning in the prior art, the utility model provides a cleaning device for a plate heat exchanger of a nuclear power station.

In view of the above technical problems, the embodiment of the utility model provides a cleaning device for a plate heat exchanger of a nuclear power station, which comprises a mobile trolley, a box body provided with an inner space, and a high-pressure pump, a liquid tank and a purging device which are all arranged in the inner space; the box body is arranged on the mobile trolley;

the box body is also provided with a first interface communicated with the outlet of the high-pressure pump, the inlet of the high-pressure pump is communicated with the liquid tank, and the liquid tank is provided with a medicine adding port; the first interface is detachably connected with a cleaning inlet of the plate heat exchanger to be cleaned;

the box body is also provided with a second interface communicated with the purging device, and the purging device is detachably connected with a cleaning inlet of the plate heat exchanger to be cleaned through the second interface.

Optionally, the cleaning device for the plate heat exchanger of the nuclear power station further comprises a filter box installed in the inner space, a third interface communicated with an inlet of the filter box is further arranged on the box body, and an outlet of the filter box is communicated with the liquid tank; the third interface is detachably communicated with a cleaning outlet of the plate heat exchanger to be cleaned.

Optionally, the cleaning device for the plate heat exchanger of the nuclear power station further comprises a PH value detection part arranged in the liquid tank, and the PH value detection part is used for detecting PH value of cleaning liquid in the liquid tank.

Optionally, the dosing port comprises an acid dosing port and an alkali dosing port; the cleaning device of the plate heat exchanger of the nuclear power station also comprises an automatic acid adder and an automatic alkali adder; the automatic acid adding device is communicated with the acid adding port and is used for adding acidic substances into the liquid tank; the automatic alkali adding device is communicated with the alkali adding port and is used for adding alkaline substances into the liquid tank.

Optionally, the automatic acid adding device comprises a first rotary driving piece, a first conveying screw, an acid adding funnel and a first pipeline provided with a first inner hole, wherein the acid adding funnel is communicated with the first inner hole, and an outlet of the first inner hole is communicated with the acid adding port; the first conveying screw is rotatably arranged in the first inner hole, the output end of the first rotary driving piece is connected with the first conveying screw, and the first rotary driving piece is used for driving the first conveying screw to rotate so as to add acidic substances in the first inner hole into the liquid tank.

Optionally, the automatic alkali adding device comprises a second rotary driving piece, a second conveying screw, an alkali adding funnel and a second pipeline provided with a second inner hole, wherein the alkali adding funnel is communicated with the second inner hole, and an outlet of the second inner hole is communicated with the alkali adding port; the second conveying screw is rotatably arranged in the second inner hole, the output end of the second rotary driving piece is connected with the second conveying screw, and the second rotary driving piece is used for driving the second conveying screw to rotate so as to add alkaline substances in the second inner hole into the liquid tank.

Optionally, the cleaning device for the plate heat exchanger of the nuclear power station further comprises a display screen arranged on the box body, and the display screen is electrically connected with the high-pressure pump, the purging device, the pH value detection part, the automatic acid adder and the automatic acid adder.

Optionally, the cleaning device for the plate heat exchanger of the nuclear power station further comprises a stirring driving piece and a stirring piece arranged at the output end of the stirring driving piece, wherein the stirring driving piece is used for driving the stirring piece to stir the cleaning liquid in the liquid tank.

Optionally, the liquid tank comprises a tank body and a tank cover detachably covered on the tank body, and the stirring driving piece is arranged on the tank cover.

Optionally, the mobile trolley comprises a bottom plate, a pushing handle installed on the bottom plate and a roller installed at the bottom of the bottom plate; the box body is arranged on the bottom plate.

According to the utility model, when the plate heat exchanger in the nuclear power station needs to be cleaned, the plate heat exchanger cleaning device of the nuclear power station is moved to a cleaning place by using the moving trolley; the method comprises the steps that firstly, a quick pipe joint is used for communicating the first connector with a cleaning inlet of a plate heat exchanger to be cleaned, the high-pressure pump pumps cleaning liquid in the liquid tank, pressurizes the cleaning liquid and then conveys the cleaning liquid into the plate heat exchanger to be cleaned, and the high-pressure cleaning liquid can flow out after high-pressure cleaning of each cooling plate of the plate heat exchanger; when the high-pressure pump finishes high-pressure water washing of the plate heat exchanger to be cleaned, the second connector is communicated with the cleaning inlet of the plate heat exchanger to be cleaned by utilizing the quick pipe joint, and the purging device purges the plate heat exchanger to be cleaned; after the purging is finished, the high-pressure pump can also wash the plate heat exchanger to be cleaned with high-pressure water again; therefore, the cleaning device for the plate heat exchanger of the nuclear power station can perform high-pressure water washing and high-pressure blowing on the plate heat exchanger to be cleaned, and the smoothness of the plate heat exchanger to be cleaned after being cleaned is ensured; the plate heat exchanger to be cleaned does not need to be disassembled, and the plate heat exchanger can be cleaned on line, so that the cleaning efficiency of the plate heat exchanger is improved, and the cleaning workload of the plate heat exchanger is reduced; the design of the mobile trolley improves the convenience of moving the plate heat exchanger cleaning device of the nuclear power station.

In addition, be equipped with the charge mouth on the liquid jar, the staff can add washing liquid, acidic material and alkaline material etc. in the liquid jar through the charge mouth to the staff can dispose different washing liquids on line, has further improved the patency after this nuclear power station plate heat exchanger belt cleaning device treats the washing plate heat exchanger.

Drawings

The utility model will be further described with reference to the drawings and examples.

Fig. 1 is a schematic structural view of a cleaning device for a plate heat exchanger of a nuclear power plant and a plate heat exchanger to be cleaned according to an embodiment of the present utility model;

FIG. 2 is a schematic view of a cleaning device for a plate heat exchanger of a nuclear power plant according to an embodiment of the present utility model;

FIG. 3 is a schematic view of a liquid tank portion of a plate heat exchanger cleaning apparatus for a nuclear power plant according to an embodiment of the present utility model;

fig. 4 is a schematic view of a liquid tank portion of a plate heat exchanger cleaning device for a nuclear power plant according to an embodiment of the present utility model.

Reference numerals in the specification are as follows:

1. a moving trolley; 11. a bottom plate; 12. pushing hands; 13. a roller; 2. a case; 21. a first interface; 22. a second interface; 23. a third interface; 24. a display screen; 3. a high pressure pump; 4. a liquid tank; 411. an acid adding port; 412. an alkali adding port; 42. a tank body; 43. a can lid; 5. a purge device; 6. a filter box; 7. a pH value detecting member; 8. an automatic acid adder; 81. a first rotary drive member; 82. a first conveyor screw; 83. an acid adding funnel; 84. a first pipe; 9. an automatic alkali adding device; 91. a second rotary driving member; 92. a second conveyor screw; 93. an alkali adding funnel; 94. a second pipe; 101. a stirring driving member; 102. a stirring member; 100. the plate heat exchanger is to be cleaned.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects solved by the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

It is to be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear", "middle", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the utility model.

As shown in fig. 1 and 2, the cleaning device for the plate heat exchanger of the nuclear power station provided by an embodiment of the utility model comprises a mobile trolley 1, a box body 2 provided with an inner space, a high-pressure pump 3, a liquid tank 4 and a purging device 5 which are all installed in the inner space; the box body 2 is arranged on the mobile trolley 1; it will be appreciated that the mobile cart 1 includes, but is not limited to, a trolley, an automated mobile cart, etc.; the purge device 5 includes, but is not limited to, an air compressor or the like.

The box body 2 is also provided with a first interface 21 communicated with the outlet of the high-pressure pump 3, the inlet of the high-pressure pump 3 is communicated with the liquid tank 4, and the liquid tank 4 is provided with a medicine adding port; the first interface 21 is detachably connected with a cleaning inlet of the plate heat exchanger 100 to be cleaned; it will be appreciated that a user may add acidic substances, basic substances, detergents, etc. into the liquid tank 4 through the dosing port; the first connection 21 and the cleaning inlet of the plate heat exchanger 100 to be cleaned can be communicated through a quick coupling.

The box body 2 is also provided with a second interface 22 communicated with the purging device 5, and the purging device 5 is detachably connected with a cleaning inlet of the plate heat exchanger 100 to be cleaned through the first interface 21. It will be appreciated that the second connection 22 may be in communication with the cleaning inlet of the plate heat exchanger 100 to be cleaned via a quick coupling. The cleaning inlet may be any one of a cold source inlet, a cold source outlet, a heat source inlet, and a heat source outlet of the plate heat exchanger 100 to be cleaned.

Specifically, when the plate heat exchanger in the nuclear power station needs to be cleaned, the plate heat exchanger cleaning device of the nuclear power station is moved to a cleaning place by using the moving trolley 1; firstly, the first connector 21 is communicated with a cleaning inlet of the plate heat exchanger 100 to be cleaned by utilizing a quick pipe joint, the high-pressure pump 3 pumps the cleaning liquid in the liquid tank 4 and pressurizes the cleaning liquid, the cleaning liquid is conveyed into the plate heat exchanger 100 to be cleaned, and the high-pressure cleaning liquid can flow out after being subjected to high-pressure cleaning on each radiating plate of the plate heat exchanger; after the high-pressure pump 3 finishes high-pressure water washing of the plate heat exchanger 100 to be cleaned, the second interface 22 is communicated with the cleaning inlet of the plate heat exchanger 100 to be cleaned by using a quick pipe joint, and the purging device 5 purges the plate heat exchanger 100 to be cleaned; after the purging is finished, the high-pressure pump 3 can also wash the plate heat exchanger 100 to be cleaned with high-pressure water again; the cleaning device for the plate heat exchanger of the nuclear power station can perform high-pressure water washing and high-pressure blowing on the plate heat exchanger 100 to be cleaned, and ensures the smoothness of the plate heat exchanger 100 to be cleaned after being cleaned; the plate heat exchanger 100 to be cleaned does not need to be disassembled, so that the plate heat exchanger can be cleaned on line, the cleaning efficiency of the plate heat exchanger is improved, and the cleaning workload of the plate heat exchanger is reduced; the design of the mobile trolley 1 improves the convenience of moving the plate heat exchanger cleaning device of the nuclear power station.

In addition, be equipped with the charge mouth on the liquid jar 4, the staff can add washing liquid, acidic material and alkaline material etc. in the charge mouth to liquid jar 4 to the staff can dispose different washing liquids on line, has further improved the patency after this nuclear power station plate heat exchanger belt cleaning device waits to wash plate heat exchanger 100 washs.

In an embodiment, as shown in fig. 1 and 2, the cleaning device for the plate heat exchanger of the nuclear power station further comprises a filter box 6 installed in the inner space, a third interface 23 which is communicated with an inlet of the filter box 6 is further arranged on the box body 2, and an outlet of the filter box 6 is communicated with the liquid tank 4; the third interface 23 is detachably connected to the cleaning outlet of the plate heat exchanger 100 to be cleaned. It will be appreciated that the third connection 23 may be in communication with the cleaning outlet of the plate heat exchanger 100 to be cleaned via a quick coupling. It should be noted that the cleaning outlet may be any one of a cold source inlet, a cold source outlet, a heat source inlet and a heat source outlet of the plate heat exchanger to be cleaned 100, and the cleaning liquid inlet and the cleaning liquid outlet are two interfaces of the plate heat exchanger to be cleaned 100 that are mutually communicated.

Specifically, after the high-pressure pump 3 fills the plate heat exchanger 100 to be cleaned with the high-pressure cleaning solution, the cleaning solution flows into the filter tank 6 through the cleaning outlet of the plate heat exchanger 100 to be cleaned, and the cleaned cleaning solution flows into the liquid tank 4 after being filtered by the filter tank 6, so that the cleaning solution can be recycled.

In an embodiment, as shown in fig. 4, the cleaning device for the plate heat exchanger of the nuclear power station further includes a ph detecting element 7 installed in the liquid tank 4, where the ph detecting element 7 is used for detecting the ph of the cleaning liquid in the liquid tank 4. It can be appreciated that the PH detecting member 7 includes, but is not limited to, a PH tester, etc., and the PH detecting member 7 can automatically detect the PH of the cleaning solution in the liquid tank 4, so as to prompt a worker to add an acidic substance or an alkaline substance into the liquid tank 4, thereby ensuring that the PH of the cleaning solution in the liquid tank 4 is within a proper range.

In one embodiment, as shown in fig. 2 and 3, the dosing port includes an acid port 411 and an alkali port 412; the cleaning device for the plate heat exchanger of the nuclear power station also comprises an automatic acid adder 8 and an automatic alkali adder 9; the automatic acid adder 8 is communicated with the acid adding port 411 and is used for adding acidic substances into the liquid tank 4; the automatic alkali adder 9 is communicated with the alkali adding port 412 and is used for adding alkaline substances into the liquid tank 4. It will be appreciated that the automatic acid adder 8 and the automatic base adder 9 each include, but are not limited to, peristaltic pumps, screw pumps, and the like. In this embodiment, according to the ph value of the cleaning solution in the liquid tank 4 detected by the ph value detecting element 7, the automatic acid adder 8 may automatically add an acidic material into the liquid tank 4 through the acid adding port 411, or the automatic alkali adder 9 may automatically add an alkaline material into the liquid tank 4 through the alkali port, so that the ph value of the cleaning solution in the liquid tank 4 may be automatically adjusted to a suitable range, and the automation degree of the cleaning device for the plate heat exchanger of the nuclear power station is further improved.

In one embodiment, as shown in fig. 3 and 4, the automatic acid feeder 8 includes a first rotary driving member 81, a first conveying screw 82, an acid adding funnel 83, and a first pipe 84 having a first inner hole, wherein the acid adding funnel 83 is connected to the first inner hole, and an outlet of the first inner hole is connected to the acid adding port 411; the first conveying screw 82 is rotatably installed in the first inner hole, the output end of the first rotary driving piece 81 is connected with the first conveying screw 82, and the first rotary driving piece 81 is used for driving the first conveying screw 82 to rotate so as to add acidic substances in the first inner hole into the liquid tank 4. It will be appreciated that the first rotary drive 81 includes, but is not limited to, a rotary motor or the like, and the acid hopper 83 is mounted above the first conduit 84 so that the acidic material in the acid hopper 83 automatically drops into the first bore. The automatic acid adder 8 adds an acidic substance in a powder or liquid form to the liquid tank 4.

Specifically, the first rotary driving member 81 drives the first conveying screw 82 to rotate in the first inner hole, and the first conveying screw 82 may convey the acidic material in the first inner hole to the liquid tank 4 through the acid adding port 411; by controlling the number of turns of the first conveying screw 82, the amount of acidic substances added into the liquid tank 4 by the automatic acid adder 8 can be controlled, and the pH value of the cleaning liquid in the liquid tank 4 can be accurately controlled.

In one embodiment, as shown in fig. 3 and 4, the automatic alkali adder 9 includes a second rotary driving member 91, a second conveying screw 92, an alkali adding funnel 93, and a second pipe 94 provided with a second inner hole, wherein the alkali adding funnel 93 is communicated with the second inner hole, and an outlet of the second inner hole is communicated with the alkali adding port 412; the second conveying screw 92 is rotatably installed in the second inner hole, an output end of the second rotary driving piece 91 is connected with the second conveying screw 92, and the second rotary driving piece 91 is used for driving the second conveying screw 92 to rotate so as to add alkaline substances in the second inner hole into the liquid tank 4. It will be appreciated that the second rotary drive 91 includes, but is not limited to, a rotary motor or the like, and the alkalizing funnel 93 is mounted above the second pipe 94 so that the alkaline substance in the alkalizing funnel 93 automatically falls into the second inner bore. The automatic alkali adder 9 adds an alkali substance in a powder or liquid form to the liquid tank 4.

Specifically, the second rotary driving piece 91 drives the second conveying screw 92 to rotate in the second inner hole, and the second conveying screw 92 can convey the alkaline substance in the second inner hole into the liquid tank 4 through the alkaline adding port 412; by controlling the number of turns of the second conveying screw 92, the amount of alkaline substances added into the liquid tank 4 by the automatic alkali adder 9 can be controlled, and the pH value of the cleaning liquid in the liquid tank 4 can be accurately controlled.

In an embodiment, as shown in fig. 1, the cleaning device for the plate heat exchanger of the nuclear power station further includes a display screen 24 mounted on the tank 2, where the display screen 24 is electrically connected to the high-pressure pump 3, the purge device 5, the ph value detector 7, the automatic acid adder 8, and the automatic acid adder 8. It will be appreciated that the display screen 24 may display the ph of the cleaning liquid, the operating pressure of the high-pressure pump 3, the amount of acidic substances added by the automatic acid adder 8, the amount of alkaline substances added by the automatic acid adder 8, and the like in real time. In this embodiment, due to the design of the display screen 24, a worker may obtain various data through the display screen 24, so that the user experience of the cleaning device for the plate heat exchanger of the nuclear power station is further improved.

In an embodiment, as shown in fig. 3 and fig. 4, the cleaning device for the plate heat exchanger of the nuclear power plant further includes a stirring driving member 101 and a stirring member 102 installed at an output end of the stirring driving member 101, where the stirring driving member 101 is used for driving the stirring member 102 to stir the cleaning solution in the liquid tank 4. It will be appreciated that the stirring driving member 101 may drive the interaction member to rotate in the liquid tank 4, so that the stirring member 102 may stir the cleaning solution in the liquid tank 4, and the stirring member 102 may make the acidic or alkaline substance fully dissolved in the liquid tank 4, thereby ensuring the quality of the cleaning solution in the liquid tank 4.

In one embodiment, as shown in fig. 1, the liquid tank 4 includes a tank body 42 and a tank cover 43 detachably fitted on the tank body 42, and the agitation driving member 101 is mounted on the tank cover 43. It will be appreciated that the lid 43 is closed on top of the tank body 42 and the agitation driving member 101 is integrated with the lid 43, thereby facilitating the removal and installation of the liquid tank 4.

In one embodiment, as shown in fig. 1, the mobile cart 1 includes a base plate 11, a pushing handle 12 mounted on the base plate 11, and a roller 13 mounted on the bottom of the base plate 11; the case 2 is mounted on the bottom plate 11. It can be appreciated that the mobile cart 1 is a trolley, and the user can drive the mobile cart 1 to move through the pushing handle 12.

The above embodiments of the cleaning device for a plate heat exchanger of a nuclear power plant are only examples, and are not intended to limit the present utility model, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. The cleaning device for the plate heat exchanger of the nuclear power station is characterized by comprising a movable trolley, a box body provided with an inner space, a high-pressure pump, a liquid tank and a purging device, wherein the high-pressure pump, the liquid tank and the purging device are all arranged in the inner space; the box body is arranged on the mobile trolley;

2. The cleaning device for the plate heat exchanger of the nuclear power plant according to claim 1, further comprising a filter tank installed in the inner space, wherein a third interface communicating with an inlet of the filter tank is further provided on the tank body, and an outlet of the filter tank communicates with the liquid tank; the third interface is detachably communicated with a cleaning outlet of the plate heat exchanger to be cleaned.

3. The nuclear power plant plate heat exchanger cleaning device according to claim 1, further comprising a ph detecting member installed in the liquid tank, wherein the ph detecting member is used for detecting the ph of the cleaning liquid in the liquid tank.

4. A nuclear power plant plate heat exchanger cleaning device according to claim 3, wherein the dosing port comprises an acid dosing port and an alkali dosing port; the cleaning device of the plate heat exchanger of the nuclear power station also comprises an automatic acid adder and an automatic alkali adder; the automatic acid adding device is communicated with the acid adding port and is used for adding acidic substances into the liquid tank; the automatic alkali adding device is communicated with the alkali adding port and is used for adding alkaline substances into the liquid tank.

5. The nuclear power plant plate heat exchanger cleaning device of claim 4 wherein the automatic acid adder comprises a first rotary driving piece, a first conveying screw, an acid adding funnel and a first pipeline provided with a first inner hole, wherein the acid adding funnel is communicated with the first inner hole, and an outlet of the first inner hole is communicated with the acid adding port; the first conveying screw is rotatably arranged in the first inner hole, the output end of the first rotary driving piece is connected with the first conveying screw, and the first rotary driving piece is used for driving the first conveying screw to rotate so as to add acidic substances in the first inner hole into the liquid tank.

6. The nuclear power plant plate heat exchanger cleaning device according to claim 4, wherein the automatic alkali adding device comprises a second rotary driving piece, a second conveying screw, an alkali adding funnel and a second pipeline provided with a second inner hole, the alkali adding funnel is communicated with the second inner hole, and an outlet of the second inner hole is communicated with the alkali adding port; the second conveying screw is rotatably arranged in the second inner hole, the output end of the second rotary driving piece is connected with the second conveying screw, and the second rotary driving piece is used for driving the second conveying screw to rotate so as to add alkaline substances in the second inner hole into the liquid tank.

7. The nuclear power plant plate heat exchanger cleaning device of claim 4, further comprising a display screen mounted on the tank, wherein the display screen is electrically connected to the high pressure pump, the purge device, the ph detector, the automatic acid adder, and the automatic acid adder.

8. The nuclear power plant plate heat exchanger cleaning device according to claim 1, further comprising a stirring driving member and a stirring member arranged at an output end of the stirring driving member, wherein the stirring driving member is used for driving the stirring member to stir the cleaning liquid in the liquid tank.

9. The nuclear power plant plate heat exchanger cleaning apparatus of claim 8 wherein the liquid tank includes a tank body and a tank cover removably secured to the tank body, the agitation driving member being mounted to the tank cover.

10. The nuclear power plant plate heat exchanger cleaning apparatus according to any one of claims 1 to 8, wherein the traveling carriage comprises a bottom plate, a pusher mounted on the bottom plate, and a roller mounted on the bottom of the bottom plate; the box body is arranged on the bottom plate.