Drainage system

Abstract

The embodiment of the utility model provides a drainage system which comprises a drainage flash tank, a drainage tank and a first drainage connecting pipe, and the first drainage connecting pipe is connected between the drainage flash tank and the drainage tank and used for supplying drainage water in the drainage flash tank into the drainage tank. The first drain connecting pipe is provided with a Y-shaped valve, a first drain valve and a first check valve. According to the drain system, the drain flash tank and the drain tank are connected through the first drain connecting pipe so that drain water can be supplied to the drain tank from the drain flash tank, the first drain connecting pipe is provided with the Y-shaped valve, the first drain valve and the first check valve, and the Y-shaped valve and the first drain valve can prevent gas and impurities from entering the drain tank; the first check valve can avoid drainage backflow, so that the drainage system has good operation stability and operation safety, and the water quality in the drainage box can be ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to power generation technical field, concretely relates to a drainage system. BACKGROUND

[0002] Drainage refers to the water formed by the condensation of steam in various steam pipelines and steam equipment. In a power plant, drainage is collected and separated by a drainage expander, and then the drainage is recovered and stored in a drainage tank. The drainage expander and the drainage tank are connected by a pipeline forming a U-shaped water seal to transfer the drainage from the drainage expander to the drainage tank. However, during operation, the pipeline forming the U-shaped water seal has poor stability, which causes impurities and part of the steam to enter the drainage tank, affecting the water quality in the drainage tank. SUMMARY

[0003] The utility model aims at solving one of the technical problems in the related art at least to some extent. To this end, the embodiments of the utility model provide a drainage system, which has good operation stability and operation safety.

[0004] The drainage system according to the embodiments of the utility model comprises:

[0005] a drainage expander;

[0006] a drainage tank;

[0007] a first drainage connecting pipe connected between the drainage expander and the drainage tank for supplying the drainage in the drainage expander to the drainage tank, the first drainage connecting pipe having a Y-type valve, a first drainage valve, and a first check valve.

[0008] The drainage system according to the embodiments of the utility model connects the drainage expander and the drainage tank by the first drainage connecting pipe to supply the drainage from the drainage expander to the drainage tank. The first drainage connecting pipe has the Y-type valve, the first drainage valve, and the first check valve. The Y-type valve and the first drainage valve can block the gas and impurities from entering the drainage tank, and the first check valve can prevent the backflow of the drainage, so that the drainage system has good operation stability and operation safety and can ensure the water quality in the drainage tank.

[0009] In some embodiments, the drainage system further comprises a second drainage connecting pipe connected between the drainage expander and the drainage tank, the second drainage connecting pipe having a second stop valve, and the first drainage connecting pipe having a first stop valve.

[0010] In some embodiments, the drainage system further comprises:

[0011] a total stop valve connected to the drain tank, the total stop valve connecting an inlet end of the first drain connection pipe and an inlet end of the second drain connection pipe;

[0012] a first drain pipe connected to the first drain connection pipe, the first drain pipe having a first drain stop valve;

[0013] a second drain pipe connected to the second drain connection pipe, the second drain pipe having a second drain stop valve.

[0014] In some embodiments, the first stop valve, the Y valve, the first drain valve and the first check valve are arranged in sequence along a direction of drain flow in the first drain connection pipe, and the first drain pipe is connected to the first drain connection pipe at a position between the first drain valve and the first check valve.

[0015] In some embodiments, the first drain valve has a filter.

[0016] In some embodiments, the drain system further comprises:

[0017] a drain pump connected to the drain tank;

[0018] a drain release pipe having an inlet end connected to the drain pump for obtaining drain supplied by the drain tank to the drain pump, and an outlet end for connection to a deaerator;

[0019] a regulating valve group connected between the drain release pipe and the drain tank for controlling backflow of drain in the drain release pipe to the drain tank, the drain release pipe being connected to the drain release pipe at a position downstream of the connection of the drain pump to the drain release pipe along a direction of drain flow in the drain release pipe.

[0020] In some embodiments, the regulating valve group comprises a first branch and a second branch connected in parallel, the first branch having a third stop valve, a regulating valve and a fourth stop valve arranged in sequence along a direction of drain flow in the first branch, and the second branch having a fifth stop valve.

[0021] In some embodiments, the drain system further comprises a second check valve, a sixth stop valve and a first gate valve, the second check valve and the sixth stop valve being connected in series between the drain pump and the drain release pipe,

[0022] The first gate valve is connected with the drain tank, the drain pump is at least two, each drain pump is connected with the drain tank through the first gate valve, and the second check valve and the sixth stop valve are arranged between each drain pump and the drain release pipe.

[0023] In some embodiments, the drain system further comprises a steam release pipe, an inlet end of the steam release pipe is connected with the drain expander, an outlet end of the steam release pipe is used for connecting a deaerator to supply steam in the drain expander to the deaerator, and the steam release pipe is provided with a second gate valve and a third check valve.

[0024] In some embodiments, the drain system further comprises:

[0025] A desalted water pipe is connected with the drain expander, and the desalted water pipe is used for supplying desalted water to the drain expander, and the desalted water pipe is provided with a control valve.

[0026] A high-pressure supply pipe is connected with the drain expander, and the high-pressure supply pipe is used for supplying high-pressure drain into the drain expander.

[0027] A low-pressure supply pipe is connected with the drain tank, and the low-pressure supply pipe is used for supplying low-pressure drain into the drain tank. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a structural schematic view of a drain system of an embodiment of the utility model;

[0029] Figure 2 is Figure 1 is a structural schematic view of part A.

[0030] REFERENCE NUMERALS:

[0031] 1. drain expander; 2. second drain connection pipe; 21. second stop valve; 3. first drain connection pipe; 31. Y valve; 32. first drain valve; 33. first check valve; 34. first stop valve; 4. total stop valve; 5. first emptying pipe; 51. first emptying stop valve; 6. second emptying pipe; 61. second emptying stop valve; 7. drain pump; 8. drain release pipe; 9. adjusting valve group; 91. third stop valve; 92. adjusting valve; 93. fourth stop valve; 94. fifth stop valve; 10. second check valve; 11. sixth stop valve; 12. first gate valve; 13. steam release pipe; 131. second gate valve; 132. third check valve; 14. desalted water pipe; 141. control valve; 15. high-pressure supply pipe; 16. low-pressure supply pipe; 17. drain tank. DETAILED DESCRIPTION

[0032] The embodiments of the present application are described in detail below, examples of which are shown in the drawings. The embodiments described below by reference to the drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0033] Reference is made below Figure 1 and Figure 2 The drain system according to the embodiments of the present application is described.

[0034] As Figure 1 and Figure 2 shown, the drain system of the embodiments of the present application comprises a drain expander 1, a drain tank 17 and a first drain connecting pipe 3.

[0035] The first drain connecting pipe 3 is connected between the drain expander 1 and the drain tank 17 for supplying the drain in the drain expander 1 into the drain tank 17, and the first drain connecting pipe 3 has a Y-type valve 31, a first drain valve 32 and a first check valve 33.

[0036] As Figure 1 and Figure 2 shown, the drain expander 1 is used for separating steam and drain, the drain tank 17 is used for receiving and storing the drain generated by the drain expander 1, the first drain connecting pipe 3 is connected between the drain expander 1 and the drain tank 17 for supplying the drain generated by the drain expander 1 into the drain tank 17, and the first drain connecting pipe 3 has a Y-type valve 31, a first drain valve 32 and a first check valve 33. The Y-type valve 31 can avoid the accumulation of gas in the first drain connecting pipe 3, the first drain valve 32 can discharge the gas in the first drain connecting pipe 3, preferably, the first drain valve 32 has a filter to enable the first drain valve 32 to filter and block the impurities in the drain at the same time, and the first check valve 33 can prevent the drain in the first drain connecting pipe 3 from flowing back. Thus, the first drain connecting pipe 3 has good running stability and running safety, and can ensure the water quality in the drain tank.

[0037] The drain system of the embodiments of the present application connects the drain expander and the drain tank through the first drain connecting pipe for supplying the drain from the drain expander to the drain tank, the first drain connecting pipe has a Y-type valve, a first drain valve and a first check valve, the Y-type valve and the first drain valve can block the gas and impurities from entering the drain tank, and the first check valve can avoid the backflow of the drain, so that the drain system has good running stability and running safety, and can ensure the water quality in the drain tank.

[0038] In some embodiments, the drain system of the embodiments of the present application further comprises a second drain connecting pipe 2, the second drain connecting pipe 2 is connected between the drain expander 1 and the drain tank 17, the second drain connecting pipe 2 has a second stop valve 21, and the first drain connecting pipe 3 has a first stop valve 34.

[0039] As shown in Figure 2 The second hydrophobic connecting pipe 2 is connected between the hydrophobic expansion vessel 1 and the hydrophobic tank 17, for supplying the hydrophobic generated by the hydrophobic expansion vessel 1 into the hydrophobic tank 17, in other words, the second hydrophobic connecting pipe 2 and the first hydrophobic connecting pipe 3 are connected in parallel between the hydrophobic expansion vessel 1 and the hydrophobic tank 17, the first hydrophobic connecting pipe 3 is provided with a first stop valve 34 for controlling the opening and closing and the opening degree of the first hydrophobic connecting pipe 3, and the second hydrophobic connecting pipe 2 is provided with a second stop valve 21 for controlling the opening and closing and the opening degree of the second hydrophobic connecting pipe 2.

[0040] When the hydrophobic expansion vessel 1 has pressure, the first hydrophobic connecting pipe 3 is opened, and the second hydrophobic connecting pipe 2 is closed, when the hydrophobic expansion vessel 1 has no pressure, the second hydrophobic connecting pipe 2 is opened, and the first hydrophobic connecting pipe 3 is closed. Preferably, when the hydrophobic system is normally running, the first hydrophobic connecting pipe 3 is opened, and the second hydrophobic connecting pipe 2 is closed, when the hydrophobic expansion vessel 1 needs to be repaired, or the whole hydrophobic system needs to be repaired, the second hydrophobic connecting pipe 2 is opened, and the first hydrophobic connecting pipe 3 is closed.

[0041] In some embodiments, the hydrophobic system of the utility model further comprises a total stop valve 4, a first emptying pipe 5 and a second emptying pipe 6.

[0042] The total stop valve 4 is connected with the hydrophobic tank 17, and the total stop valve 4 is connected with the inlet end of the first hydrophobic connecting pipe 3 and the inlet end of the second hydrophobic connecting pipe 2. The first emptying pipe 5 is connected with the first hydrophobic connecting pipe 3, and the first emptying pipe 5 is provided with a first emptying stop valve 51. The second emptying pipe 6 is connected with the second hydrophobic connecting pipe 2, and the second emptying pipe 6 is provided with a second emptying stop valve 61.

[0043] As shown in Figure 2 The outlet of the hydrophobic tank 17 is connected with the total stop valve 4, the inlet end of the first hydrophobic connecting pipe 3 and the inlet end of the second hydrophobic connecting pipe 2 are connected with the total stop valve 4, and preferably, the first hydrophobic connecting pipe 3, the second hydrophobic connecting pipe 2 and the pipeline provided with the total stop valve 4 are connected through a three-way pipe. The first hydrophobic connecting pipe 3 and the second hydrophobic connecting pipe 2 can be simultaneously cut off from the hydrophobic tank 17 through the total stop valve 4.

[0044] The middle part of the first hydrophobic connecting pipe 3 is connected with the first emptying pipe 5, and the first emptying pipe 5 is provided with a first emptying stop valve 51 for controlling the opening and closing and the opening degree of the first emptying pipe 5. When the total stop valve 4 is closed and the first emptying stop valve 51 is opened, the first hydrophobic connecting pipe 3 can be emptied through the first emptying pipe 5, thereby facilitating maintenance and repair.

[0045] Preferably, the first stop valve 34, the Y-type valve 31, the first drain valve 32 and the first check valve 33 are arranged in sequence along the direction of the drain flow in the first drain connection pipe 3, and the connection position of the first evacuation pipe 5 with the first drain connection pipe 3 is located between the first drain valve 32 and the first check valve 33. The first check valve 33 can prevent the drain in the drain tank 17 from flowing back to the first evacuation pipe 5.

[0046] The middle part of the second drain connection pipe 2 is connected with the second evacuation pipe 6, and the second evacuation pipe 6 is provided with a second evacuation stop valve 61, and the opening and closing and the opening degree of the second evacuation pipe 6 are controlled by the second evacuation stop valve 61. When the total stop valve 4 is closed and the second evacuation stop valve 61 is opened, the second drain connection pipe 2 can be evacuated through the second evacuation pipe 6, thereby facilitating maintenance and repair.

[0047] Preferably, the connection position of the second evacuation pipe 6 with the second drain connection pipe 2 is located between the second stop valve 21 and the drain tank 17.

[0048] Preferably, the outlet end of the first evacuation pipe 5 and the outlet end of the second evacuation pipe 6 are connected with or arranged opposite to the trench, so that the evacuated drain is directly discharged through the trench.

[0049] In some embodiments, the drain system of the utility model also comprises a drain pump 7, a drain release pipe 8 and a regulating valve group 9.

[0050] The drain pump 7 is connected with the drain tank 17. The inlet end of the drain release pipe 8 is connected with the drain pump 7, so as to obtain the drain supplied by the drain pump 7 from the drain tank 17, and the outlet end of the drain release pipe 8 is used for connecting the deaerator. The regulating valve group 9 is connected between the drain release pipe 8 and the drain tank 17, so as to control the drain in the drain release pipe 8 to flow back to the drain tank 17. Along the direction of the drain flow in the drain release pipe 8, the connection position of the drain release pipe 8 with the drain release pipe 8 is located downstream of the connection position of the drain pump 7 with the drain release pipe 8.

[0051] As shown in Figure 1 The outlet end of the drain tank 17 is connected with the drain pump 7, the inlet end of the drain release pipe 8 is connected with the drain pump 7, and the outlet end of the drain release pipe 8 is used for connecting the deaerator, so that the drain in the drain tank 17 is supplied to the deaerator through the drain release pipe 8 by the drain pump 7, thereby realizing the secondary utilization of the drain.

[0052] The adjusting valve group 9 is connected between the drain release pipe 8 and the drain tank 17, and the connection position of the drain pump 7 and the drain release pipe 8 and the connection position of the adjusting valve group 9 and the drain release pipe 8 are arranged in sequence along the flow direction of the drain in the drain release pipe 8, and the drain in the drain release pipe 8 can be controlled to flow back to the drain tank 17 through the adjusting valve group 9, including whether the drain flows back to the drain tank 17 from the drain release pipe 8 and the flow rate of the drain flowing back to the drain tank 17 from the drain release pipe 8, for example, when the flow rate in the drain release pipe 8 is greater than the flow rate of the drain that the deaerator can receive, the excess flow rate of the drain flows back to the drain tank 17 through the adjusting valve group 9, avoiding waste of the drain and damage to the deaerator caused by excessive flow rate of the drain.

[0053] Preferably, the drain release pipe 8 has a seventh stop valve for controlling the opening and closing and the opening degree of the drain release pipe 8, and the connection position of the adjusting valve group 9 and the drain release pipe 8 is located upstream of the seventh stop valve along the flow direction of the drain in the drain release pipe 8. When the deaerator does not need to receive the drain, the seventh stop valve is closed, at this time, the drain pump 7 can be closed to avoid the drain in the drain tank 17 continuing to enter the drain release pipe 8, or the drain in the drain release pipe 8 can be completely flowed back to the drain tank 17 through the adjusting valve group 9.

[0054] In some embodiments, the adjusting valve group 9 includes a first branch and a second branch connected in parallel, the first branch has a third stop valve 91, an adjusting valve 92 and a fourth stop valve 93, the third stop valve 91, the adjusting valve 92 and the fourth stop valve 93 are arranged in sequence along the flow direction of the drain in the first branch, and the second branch has a fifth stop valve 94.

[0055] As shown in Figure 1 The adjusting valve group 9 includes a main pipe and a first branch and a second branch connected in parallel in the middle of the main pipe, the inlet end of the main pipe is connected to the drain release pipe 8, the outlet end of the main pipe is connected to the drain tank 17, and the first branch and the second branch are preferably one of which is open and the other of which is closed to connect the inlet end and the outlet end of the main pipe.

[0056] The first branch has a third stop valve 91, an adjusting valve 92 and a fourth stop valve 93, the third stop valve 91, the adjusting valve 92 and the fourth stop valve 93 are arranged in sequence along the flow direction of the drain in the first branch, the second branch has a fifth stop valve 94, the third stop valve 91 and the fourth stop valve 93 can be controlled to open and close the first branch, the fifth stop valve 94 can be controlled to open and close the second branch, and the adjusting valve 92 is used to control the opening degree of the first branch, in other words, to control the flow rate of the drain in the first branch.

[0057] Preferably, when the drainage system is operating normally, the first branch is open and the second branch is closed. The flow rate of drainage returning to the drainage tank 17 via the regulating valve group 9 is controlled by the regulating valve 92. When the regulating valve 92 needs to be repaired or replaced, the first branch is closed and the second branch is opened.

[0058] In some embodiments, the drainage system of this utility model further includes a second check valve 10, a sixth shut-off valve 11, and a first gate valve 12. The second check valve 10 and the sixth shut-off valve 11 are connected in series between the drainage pump 7 and the drainage release pipe 8. The first gate valve 12 is connected to the drainage tank 17. There are at least two drainage pumps 7, and each drainage pump 7 is connected to the drainage tank 17 through the first gate valve 12. Each drainage pump 7 and the drainage release pipe 8 are provided with a corresponding second check valve 10 and a sixth shut-off valve 11.

[0059] like Figure 1 As shown, a second check valve 10 and a sixth shut-off valve 11 are connected between the condensate pump 7 and the condensate release pipe 8. The second check valve 10 and the sixth shut-off valve 11 are arranged in sequence along the flow direction of the condensate from the condensate pump 7 to the condensate release pipe 8. The second check valve 10 is used to prevent the condensate in the condensate release pipe 8 from flowing back to the condensate pump 7. The sixth shut-off valve 11 is used to control the opening degree of the condensate pump 7 and the condensate release pipe 8.

[0060] There are at least two drain pumps 7, preferably two. The inlet ends of both drain pumps 7 are connected to a transfer pipe. The transfer pipe is connected to the drain tank 17 through a first gate valve 12. The first gate valve 12 is used to control the opening and closing of the transfer pipe, in other words, to control the simultaneous on / off connection between all drain pumps 7 and the drain tank 17. Each drain pump 7 is equipped with a corresponding second check valve 10 and a sixth shut-off valve 11 between itself and the drain release pipe 8.

[0061] When the drainage system is running normally, one of the drainage pumps 7 can be turned on and the other drainage pump 7 can be turned off to allow for maintenance and replacement of the turned-off drainage pump 7 and the corresponding second check valve 10 and sixth shut-off valve 11. Alternatively, the number of drainage pumps 7 that can be turned on can be selected according to the required flow rate of the drainage release pipe 8. For example, both drainage pumps 7 can be turned on so that the drainage in the drainage tank 17 enters the drainage release pipe 8 at the maximum flow rate and then enters the deaerator.

[0062] In some embodiments, the hydrophobic system of this utility model further includes a steam release pipe 13, the inlet end of which is connected to the hydrophobic expansion container 1, and the outlet end of which is connected to the deaerator to supply steam in the hydrophobic expansion container 1 to the deaerator. The steam release pipe 13 has a second gate valve 131 and a third check valve 132.

[0063] like Figure 1As shown, the hydrophobic expander 1 is connected with the inlet end of the steam release pipe 13, and the outlet end of the steam release pipe 13 is used to connect the deaerator to supply the steam generated by the hydrophobic expander 1 to the deaerator to realize the utilization of the steam and the heat energy of the steam. The steam release pipe 13 has a second gate valve 131 and a third check valve 132, which are arranged in sequence along the flow direction of the steam in the steam release pipe 13, the second gate valve 131 is used to control the opening and closing of the steam release pipe 13, and the third check valve 132 is used to avoid the backflow of the steam.

[0064] In some embodiments, the hydrophobic system of the utility model embodiment further comprises a desalted water pipe 14, a high-pressure supply pipe 15 and a low-pressure supply pipe 16.

[0065] The desalted water pipe 14 is connected with the hydrophobic expander 1, and the desalted water pipe 14 is used to supply desalted water to the hydrophobic expander 1. The desalted water pipe 14 has a control valve 141. The high-pressure supply pipe 15 is connected with the hydrophobic expander 1, and the high-pressure supply pipe 15 is used to supply high-pressure hydrophobic water into the hydrophobic expander 1. The low-pressure supply pipe 16 is connected with the hydrophobic tank 17, and the low-pressure supply pipe 16 is used to supply low-pressure hydrophobic water into the hydrophobic tank 17.

[0066] As shown in the figure, Figure 2 The hydrophobic expander 1 is connected with the outlet end of the desalted water pipe 14 to receive the desalted water provided by the desalted water pipe 14. The desalted water pipe 14 has a control valve 141, which controls the opening and closing and opening degree of the desalted water pipe 14 according to the temperature in the hydrophobic expander 1 to adjust the temperature in the hydrophobic expander 1 by desalted water and avoid damage to the hydrophobic expander 1.

[0067] The outlet end of the high-pressure supply pipe 15 is connected with the hydrophobic expander 1 to supply the high-pressure hydrophobic water of the power plant room into the hydrophobic expander 1 through the high-pressure supply pipe 15. The outlet end of the low-pressure supply pipe 16 is connected with the hydrophobic tank 17 to supply the low-pressure hydrophobic water of the power plant room into the hydrophobic tank 17 through the low-pressure supply pipe 16. The high-pressure supply pipe 15 is provided with an eighth stop valve to control the opening and closing and opening degree of the high-pressure supply pipe 15, and the low-pressure supply pipe 16 is provided with a ninth stop valve to control the opening and closing and opening degree of the high-pressure supply pipe 15.

[0068] Preferably, all the stop valves, the control valve 141 and the regulating valve 92 in the utility model embodiment are electric to realize automatic operation.

[0069] In the description of the utility model, it is necessary to understand that the terms "first", "second" are only used for distinguishing, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless there is a clear specific limitation.

[0070] In the utility model, unless there is a clear provision and limitation, the terms "installation", "connection", "connection", "fixing" and other terms should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection or communication with each other; it can be directly connected, or indirectly connected through intermediate medium, or the communication or interaction relationship between two elements, unless otherwise specified. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific situation.

[0071] In the utility model, unless there is a clear provision and limitation, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be indirectly contacted through intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0072] In the utility model, the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In the description, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, the skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of different embodiments or examples without contradiction.

[0073] Although the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the utility model, and the changes, modifications, replacements and modifications of the above embodiments by the ordinary skilled in the art are within the protection scope of the utility model.

Claims

1. A hydrophobic system, characterized in that, Comprise: A hydrophobic expander (1); A hydrophobic tank (17); A first hydrophobic connecting pipe (3) connected between the hydrophobic expander (1) and the hydrophobic tank (17) for supplying the hydrophobic in the hydrophobic expander (1) to the hydrophobic tank (17), the first hydrophobic connecting pipe (3) has a Y-type valve (31), a first hydrophobic valve (32) and a first check valve (33).

2. The hydrophobic system of claim 1, wherein, Also comprising a second hydrophobic connecting pipe (2) connected between the hydrophobic expander (1) and the hydrophobic tank (17), the second hydrophobic connecting pipe (2) has a second stop valve (21), the first hydrophobic connecting pipe (3) has a first stop valve (34).

3. The hydrophobic system of claim 2, wherein, Also comprising: A total stop valve (4) connected to the hydrophobic tank (17), and the total stop valve (4) is connected to the inlet end of the first hydrophobic connecting pipe (3) and the inlet end of the second hydrophobic connecting pipe (2); A first emptying pipe (5) connected to the first hydrophobic connecting pipe (3), the first emptying pipe (5) has a first emptying stop valve (51); A second emptying pipe (6) connected to the second hydrophobic connecting pipe (2), the second emptying pipe (6) has a second emptying stop valve (61).

4. The hydrophobic system of claim 3, wherein, The first stop valve (34), the Y-type valve (31), the first hydrophobic valve (32) and the first check valve (33) are arranged in sequence along the direction of hydrophobic flow in the first hydrophobic connecting pipe (3), and the connection position of the first emptying pipe (5) and the first hydrophobic connecting pipe (3) is located between the first hydrophobic valve (32) and the first check valve (33).

5. The hydrophobic system of claim 1, wherein, The first hydrophobic valve (32) has a filter.

6. The hydrophobic system of claim 1, wherein, Also comprising: A hydrophobic pump (7) connected to the hydrophobic tank (17); A hydrophobic release pipe (8) having an inlet end connected to the hydrophobic pump (7) to obtain the hydrophobic supplied by the hydrophobic pump (7) from the hydrophobic tank (17), and an outlet end for connecting a deaerator; A regulating valve group (9) connected between the hydrophobic release pipe (8) and the hydrophobic tank (17) for controlling the return of the hydrophobic in the hydrophobic release pipe (8) to the hydrophobic tank (17), and the connection position of the hydrophobic release pipe (8) and the hydrophobic release pipe (8) is located downstream of the connection position of the hydrophobic pump (7) and the hydrophobic release pipe (8) along the direction of hydrophobic flow in the hydrophobic release pipe (8).

7. The hydrophobic system of claim 6, wherein, The regulating valve group (9) comprises a first branch and a second branch connected in parallel, the first branch has a third stop valve (91), a regulating valve (92) and a fourth stop valve (93), the third stop valve (91), the regulating valve (92) and the fourth stop valve (93) are arranged in sequence along the direction of hydrophobic flow in the first branch, and the second branch has a fifth stop valve (94).

8. The hydrophobic system of claim 6, wherein, Further comprising a second check valve (10), a sixth stop valve (11) and a first gate valve (12), the second check valve (10) and the sixth stop valve (11) are connected in series between the drain pump (7) and the drain release pipe (8), The first gate valve (12) is connected with the drain tank (17), the drain pump (7) is at least two, each drain pump (7) is connected with the drain tank (17) through the first gate valve (12), and each drain pump (7) and the drain release pipe (8) are provided with corresponding second check valve (10) and sixth stop valve (11).

9. The hydrophobic system of claim 1, wherein, Further comprising a steam release pipe (13), the inlet end of the steam release pipe (13) is connected with the drain expander (1), the outlet end of the steam release pipe (13) is used for connecting a deaerator to supply steam in the drain expander (1) to the deaerator, the steam release pipe (13) has a second gate valve (131) and a third check valve (132).

10. The hydrophobic system of claim 1, wherein, Further comprising: A desalted water pipe (14) connected with the drain expander (1), the desalted water pipe (14) is used for supplying desalted water to the drain expander (1), and the desalted water pipe (14) has a control valve (141); A high-pressure supply pipe (15) connected with the drain expander (1), the high-pressure supply pipe (15) is used for supplying high-pressure drain into the drain expander (1); A low-pressure supply pipe (16) connected with the drain tank (17), the low-pressure supply pipe (16) is used for supplying low-pressure drain into the drain tank (17).

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