Drainage system
By using the first drain connection pipe with a Y-type valve, a trap and a check valve in the drainage system, the problem of impurities and steam entering the drainage tank caused by poor pipeline stability is solved, and a more stable and safe drainage system operation is achieved, and the water quality is ensured.
Patent Information
- Application Number
- CN202510086027.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-20
- Publication Date
- 2025-03-21
AI Technical Summary
In power plant buildings, the pipelines that form U-shaped water seals have poor stability, causing impurities and some steam to enter the hydrophobic tank, affecting the water quality.
A drainage system is designed, and the drainage expander and the drainage tank are connected through a first drainage connection pipe. The first drainage connection pipe has a Y-type valve, a first drainage valve and a first check valve to prevent gas and impurities from entering and avoiding the drainage return.
It improves the operating stability and safety of the hydrophobic system and ensures the quality of water in the hydrophobic tank.
Smart Images
Figure CN119665147A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of power generation, and in particular to a drainage system. Background Art
[0002] Drain refers to the water condensed from steam in various steam pipes and steam-using equipment. In the power plant, the drain is collected and separated by the drain expansion tank, and then the drain is recovered and stored in the drain tank. The drain expansion tank and the drain tank are connected by a pipe forming a U-shaped water seal to transfer the drain from the drain expansion tank to the drain tank. However, during the operation process, the stability of the pipe forming the U-shaped water seal is poor, resulting in impurities and some steam entering the drain tank, affecting the water quality in the drain tank. Summary of the invention
[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, an embodiment of the present invention provides a drainage system, which has good operation stability and operation safety.
[0004] The hydrophobic system of the embodiment of the present invention comprises:
[0005] Hydrophobic expansion tank;
[0006] Drain tank;
[0007] A first drain connection pipe is connected between the drain expansion tank and the drain tank to supply the drain in the drain expansion tank to the drain tank. The first drain connection pipe has a Y-shaped valve, a first drain valve and a first check valve.
[0008] The drain system of the embodiment of the present invention connects the drain expansion tank and the drain tank through the first drain connecting pipe to supply drain from the drain expansion tank 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 prevent gas and impurities from entering the drain tank. The first check valve can prevent drain backflow, so that the drain system has better operation stability and safety, and can ensure the water quality in the drain tank.
[0009] In some embodiments, the drain system further includes a second drain connection pipe, the second drain connection pipe is connected between the drain expansion tank and the drain tank, the second drain connection pipe has a second stop valve, and the first drain connection pipe has a first stop valve.
[0010] In some embodiments, the hydrophobic system further comprises:
[0011] A main stop valve, the main stop valve is connected to the drain tank, and the main stop valve connects the inlet end of the first drain connecting pipe and the inlet end of the second drain connecting pipe;
[0012] a first drain pipe, the first drain pipe being connected to the first drain connection pipe, and the first drain pipe having a first drain stop valve;
[0013] A second drain pipe is connected to the second drain connection pipe, and the second drain pipe has a second drain stop valve.
[0014] In some embodiments, the first stop valve, the Y-type valve, the first steam trap and the first check valve are arranged in sequence along the direction of steam flow in the first steam trap connecting pipe, and the connection position between the first drain pipe and the first steam trap connecting pipe is located between the first steam trap and the first check valve.
[0015] In some embodiments, the first steam trap has a filter.
[0016] In some embodiments, the hydrophobic system further comprises:
[0017] A drain pump, the drain pump is connected to the drain tank;
[0018] A drain release pipe, the inlet end of which is connected to the drain pump to obtain the drain supplied by the drain pump from the drain tank, and the outlet end of which is used to connect to the deaerator;
[0019] A regulating valve group, wherein the regulating valve group is connected between the drain release pipe and the drain tank to control the drain in the drain release pipe to flow back into the drain tank. Along the direction of drain flow in the drain release pipe, the connection position between the drain release pipe and the drain release pipe is located downstream of the connection position between the drain pump and the drain release pipe.
[0020] In some embodiments, the regulating valve group includes a first branch and a second branch in parallel, the first branch has a third stop valve, a regulating valve and a fourth stop valve, the third stop valve, the regulating valve and the fourth stop valve are arranged in sequence along the hydrophobic flow direction in the first branch, and the second branch has a fifth stop valve.
[0021] In some embodiments, the drain system further includes a second check valve, a sixth stop valve and a first gate valve, wherein the second check valve and the sixth stop valve are connected in series between the drain pump and the drain release pipe.
[0022] The first gate valve is connected to the drain tank, there are at least two drain pumps, each of which is connected to the drain tank through the first gate valve, and a corresponding second check valve and sixth stop valve are provided between each drain pump and the drain release pipe.
[0023] In some embodiments, the steam release system further includes a steam release pipe, the inlet end of the steam release pipe is connected to the steam expansion tank, the outlet end of the steam release pipe is used to connect to a deaerator to supply the steam in the steam expansion tank to the deaerator, and the steam release pipe has a second gate valve and a third check valve.
[0024] In some embodiments, the hydrophobic system further comprises:
[0025] A desalted water pipe, the desalted water pipe is connected to the hydrophobic expansion tank, the desalted water pipe is used to supply desalted water to the hydrophobic expansion tank, and the desalted water pipe has a control valve;
[0026] A high-pressure supply pipe, the high-pressure supply pipe is connected to the hydrophobic expansion tank, and the high-pressure supply pipe is used to supply high-pressure hydrophobic water into the hydrophobic expansion tank;
[0027] A low-pressure supply pipe is connected to the drain tank and is used to supply low-pressure drain into the drain tank. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 is a schematic structural diagram of a hydrophobic system according to an embodiment of the present invention;
[0029] Figure 2 yes Figure 1 Schematic diagram of the structure of part A.
[0030] Reference numerals:
[0031] 1. Drain expansion tank; 2. Second drain connection pipe; 21. Second stop valve; 3. First drain connection pipe; 31. Y-type valve; 32. First drain valve; 33. First check valve; 34. First stop valve; 4. Main stop valve; 5. First drain pipe; 51. First drain stop valve; 6. Second drain pipe; 61. Second drain stop valve; 7. Drain pump; 8. Drain release pipe; 9. Regulating valve group; 91. Third stop valve; 92. Regulating 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. Demineralized water pipe; 141. Control valve; 15. High-pressure supply pipe; 16. Low-pressure supply pipe; 17. Drain tank. DETAILED DESCRIPTION
[0032] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.
[0033] Reference below Figure 1 and Figure 2 A hydrophobic system according to an embodiment of the present invention is described.
[0034] like Figure 1 and Figure 2 As shown, the drainage system of the embodiment of the present invention includes a drainage expansion container 1, a drainage box 17 and a first drainage connecting pipe 3.
[0035] The first drain connection pipe 3 is connected between the drain expansion tank 1 and the drain tank 17 to supply the drain in the drain expansion tank 1 to the drain tank 17 . The first drain connection pipe 3 has a Y-shaped valve 31 , a first drain valve 32 and a first check valve 33 .
[0036] like Figure 1 and Figure 2 As shown, the steam expansion tank 1 is used to separate steam and steam, the steam trap box 17 is used to receive and store the steam generated by the steam expansion tank 1, the first steam trap connecting pipe 3 is connected between the steam expansion tank 1 and the steam trap box 17 to supply the steam generated by the steam expansion tank 1 to the steam trap box 17, and the first steam trap connecting pipe 3 has a Y-shaped valve 31, a first steam trap 32 and a first check valve 33. The Y-shaped valve 31 can prevent gas accumulation in the first steam trap connecting pipe 3, and the first steam trap 32 can discharge the gas in the first steam trap connecting pipe 3. Preferably, the first steam trap 32 has a filter so that the first steam trap 32 can filter and block impurities in the steam trap at the same time, and the first check valve 33 can prevent the steam in the first steam trap connecting pipe 3 from flowing back. Therefore, the first steam trap connecting pipe 3 has good operation stability and operation safety, and can ensure the water quality in the steam trap box.
[0037] The drain system of the embodiment of the present invention connects the drain expansion tank and the drain tank through the first drain connecting pipe to supply drain from the drain expansion tank 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 prevent gas and impurities from entering the drain tank. The first check valve can prevent drain backflow, so that the drain system has better operation stability and safety, and can ensure the water quality in the drain tank.
[0038] In some embodiments, the drain system of the embodiment of the present invention also includes a second drain connecting pipe 2, which is connected between the drain expansion tank 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] like Figure 2As shown, the second drain connecting pipe 2 is connected between the drain expansion tank 1 and the drain tank 17 to supply the drain generated by the drain expansion tank 1 to the drain tank 17. In other words, the second drain connecting pipe 2 and the first drain connecting pipe 3 are connected in parallel between the drain expansion tank 1 and the drain tank 17. The first drain connecting pipe 3 has a first stop valve 34 to control the opening and closing and the opening degree of the first drain connecting pipe 3. The second drain connecting pipe 2 has a second stop valve 21 to control the opening and closing and the opening degree of the second drain connecting pipe 2.
[0040] When there is pressure in the hydrophobic expansion tank 1, the first hydrophobic connection pipe 3 is opened and the second hydrophobic connection pipe 2 is closed. When there is no pressure in the hydrophobic expansion tank 1, the second hydrophobic connection pipe 2 is opened and the first hydrophobic connection pipe 3 is closed. Preferably, when the hydrophobic system operates normally, the first hydrophobic connection pipe 3 is opened and the second hydrophobic connection pipe 2 is closed. When the hydrophobic expansion tank 1 needs maintenance or the hydrophobic system as a whole needs maintenance, the second hydrophobic connection pipe 2 is opened and the first hydrophobic connection pipe 3 is closed.
[0041] In some embodiments, the drain system of the embodiment of the present invention further includes a main stop valve 4 , a first drain pipe 5 and a second drain pipe 6 .
[0042] The main stop valve 4 is connected to the drain tank 17, and the main stop valve 4 connects the inlet end of the first drain connection pipe 3 and the inlet end of the second drain connection pipe 2. The first drain pipe 5 is connected to the first drain connection pipe 3, and the first drain pipe 5 has a first drain stop valve 51. The second drain pipe 6 is connected to the second drain connection pipe 2, and the second drain pipe 6 has a second drain stop valve 61.
[0043] like Figure 2 As shown, the outlet of the drain tank 17 is connected to the main stop valve 4, and the inlet end of the first drain connection pipe 3 and the inlet end of the second drain connection pipe 2 are both connected to the main stop valve 4. Preferably, the first drain connection pipe 3, the second drain connection pipe 2 and the pipeline provided with the main stop valve 4 are connected through a tee. The main stop valve 4 can simultaneously isolate the first drain connection pipe 3 and the second drain connection pipe 2 from the drain tank 17.
[0044] The middle part of the first drain connection pipe 3 is connected to the first drain pipe 5, and the first drain pipe 5 has a first drain stop valve 51, so as to control the opening and closing and the opening degree of the first drain pipe 5 through the first drain stop valve 51. When the main stop valve 4 is closed and the first drain stop valve 51 is opened, the first drain connection pipe 3 can be drained through the first drain pipe 5, so as to facilitate inspection and maintenance.
[0045] Preferably, the first stop valve 34, the Y-shaped valve 31, the first steam trap 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 between the first drain pipe 5 and the first drain connection pipe 3 is located between the first steam trap 32 and the first check valve 33. The first check valve 33 can prevent the drain in the drain tank 17 from flowing back into the first drain pipe 5.
[0046] The middle part of the second drain connection pipe 2 is connected to the second drain pipe 6, and the second drain pipe 6 has a second drain stop valve 61, and the opening and closing and the opening degree of the second drain pipe 6 are controlled by the second drain stop valve 61. When the main stop valve 4 is closed and the second drain stop valve 61 is opened, the second drain connection pipe 2 can be drained through the second drain pipe 6, so as to facilitate inspection and maintenance.
[0047] Preferably, the connection position between the second drain pipe 6 and the second drain connecting pipe 2 is located between the second stop valve 21 and the drain tank 17 .
[0048] Preferably, the outlet end of the first drain pipe 5 and the outlet end of the second drain pipe 6 are connected to the trench or arranged opposite to each other, so that the drained water can be directly discharged through the trench.
[0049] In some embodiments, the drain system of the embodiment of the present invention further includes a drain pump 7 , a drain release pipe 8 and a regulating valve group 9 .
[0050] The drain pump 7 is connected to the drain tank 17. The inlet end of the drain release pipe 8 is connected to the drain pump 7 to obtain the drain supplied by the drain tank 17 to the drain pump 7, and the outlet end of the drain release pipe 8 is used to connect the deaerator. The regulating valve group 9 is connected between the drain release pipe 8 and the drain tank 17 to control the drain in the drain release pipe 8 to flow back into 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 and the drain release pipe 8 is located downstream of the connection position of the drain pump 7 and the drain release pipe 8.
[0051] like Figure 1 As shown, the outlet of the drain tank 17 is connected to the drain pump 7, the inlet end of the drain release pipe 8 is connected to the drain pump 7, and the outlet end of the drain release pipe 8 is used to connect to the deaerator, so that the drain in the drain tank 17 is supplied to the deaerator through the drain pump 7 through the drain release pipe 8, thereby realizing the secondary utilization of the drain.
[0052] The regulating valve group 9 is connected between the drain release pipe 8 and the drain tank 17. Along the flow direction of the drain in the drain release pipe 8, the connection position of the drain pump 7 and the drain release pipe 8 and the connection position of the regulating valve group 9 and the drain release pipe 8 are arranged in sequence. The regulating valve group 9 can control the drain in the drain release pipe 8 to flow back into the drain tank 17, including controlling whether drain flows back from the drain release pipe 8 to the drain tank 17, and the flow rate of drain flowing back from the drain release pipe 8 to the drain tank 17. For example, when the flow rate in the drain release pipe 8 is greater than the flow rate of drain that the deaerator can receive, the part of the drain that exceeds the flow rate flows back to the drain tank 17 through the regulating valve group 9, so as to avoid drain waste and damage to the deaerator caused by excessive drain flow.
[0053] Preferably, the drain release pipe 8 has a seventh stop valve, which is used to control the opening and closing and the opening degree of the drain release pipe 8. Along the flow direction of the drain in the drain release pipe 8, the connection position between the regulating valve group 9 and the drain release pipe 8 is located upstream of the seventh stop valve. When the deaerator does not need to receive drain, the seventh stop valve is closed, and the drain pump 7 can be turned off at this time to prevent the drain in the drain tank 17 from continuing to enter the drain release pipe 8, and the drain in the drain release pipe 8 can also be completely returned to the drain tank 17 through the regulating valve group 9.
[0054] In some embodiments, the regulating valve group 9 includes a first branch and a second branch 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 hydrophobic flow direction in the first branch, and the second branch has a fifth stop valve 94.
[0055] like Figure 1 As shown, the regulating valve group 9 includes a main line and a first branch and a second branch located in the middle of the main line and connected in parallel. The inlet end of the main line is connected to the drain release pipe 8, and the outlet end of the main line is connected to the drain tank 17. The first branch and the second branch are preferably one of which is open and the other is closed to connect the inlet end and the outlet end of the main line.
[0056] 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 flow direction of the drain in the first branch. The second branch has a fifth stop valve 94. The opening and closing of the first branch can be controlled by the third stop valve 91 and the fourth stop valve 93, and the opening and closing of the second branch can be controlled by the fifth stop valve 94. The regulating valve 92 is used to control the opening of the first branch, in other words, to control the flow rate of the drain in the first branch.
[0057] Preferably, when the drain system operates normally, the first branch is opened and the second branch is closed, and the flow of the drain back to the drain tank 17 through the regulating valve group 9 is controlled by the regulating valve 92. When the regulating valve 92 needs to be inspected or replaced, the first branch is closed and the second branch is opened.
[0058] In some embodiments, the drain system of the embodiment of the present invention also includes 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 to the drain tank 17. There are at least two drain pumps 7, and each drain pump 7 is connected to the drain tank 17 through the first gate valve 12. A corresponding second check valve 10 and sixth stop valve 11 are provided between each drain pump 7 and the drain release pipe 8.
[0059] like Figure 1 As shown, a second check valve 10 and a sixth stop valve 11 are also connected between the drain pump 7 and the drain release pipe 8. Along the flow direction of the drain from the drain pump 7 to the drain release pipe 8, the second check valve 10 and the sixth stop valve 11 are arranged in sequence. The second check valve 10 is used to prevent the drain in the drain release pipe 8 from flowing back to the drain pump 7, and the sixth stop valve 11 is used to control the opening degree of the drain pump 7 and the drain release pipe 8.
[0060] There are at least two drain pumps 7, preferably two, the inlet ends of the two drain pumps 7 are connected to the transfer pipe, and the transfer pipe is connected to the drain tank 17 through the 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 opening and closing of all drain pumps 7 and the drain tank 17 at the same time. A corresponding second check valve 10 and a sixth stop valve 11 are provided between each drain pump 7 and the drain release pipe 8.
[0061] When the drain system is operating normally, one of the drain pumps 7 can be turned on and the other drain pump 7 can be turned off to repair and replace the closed drain pump 7 and the corresponding second check valve 10 and sixth stop valve 11. The number of drain pumps 7 to be turned on can also be selected according to the required flow rate of the drain release pipe 8. For example, both drain pumps 7 can be turned on to allow the drain in the drain tank 17 to enter the drain release pipe 8 at the maximum flow rate and then enter the deaerator.
[0062] In some embodiments, the steam release system of the embodiment of the present invention further includes a steam release pipe 13, the inlet end of the steam release pipe 13 is connected to the steam expansion tank 1, and the outlet end of the steam release pipe 13 is used to connect to the deaerator to supply the steam in the steam expansion tank 1 to the deaerator, and the steam release pipe 13 has a second gate valve 131 and a third check valve 132.
[0063] like Figure 1As shown, the steam expansion tank 1 is connected to 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 steam expansion tank 1 to the deaerator, so as to realize the utilization of the steam and the thermal energy of the steam. The steam release pipe 13 has a second gate valve 131 and a third check valve 132. Along the flow direction of the steam in the steam release pipe 13, the second gate valve 131 and the third check valve 132 are arranged in sequence. 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 prevent steam backflow.
[0064] In some embodiments, the drainage system of the embodiment of the present invention further includes a desalted water pipe 14 , a high-pressure supply pipe 15 and a low-pressure supply pipe 16 .
[0065] The deionized water pipe 14 is connected to the hydrophobic expansion tank 1, and is used to supply deionized water to the hydrophobic expansion tank 1. The deionized water pipe 14 has a control valve 141. The high-pressure supply pipe 15 is connected to the hydrophobic expansion tank 1, and is used to supply high-pressure drain water into the hydrophobic expansion tank 1. The low-pressure supply pipe 16 is connected to the drain tank 17, and is used to supply low-pressure drain water into the drain tank 17.
[0066] like Figure 2 As shown, the hydrophobic expansion tank 1 is connected to 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. The control valve 141 controls the opening and closing and the opening degree of the desalted water pipe 14 according to the temperature in the hydrophobic expansion tank 1, so as to adjust the temperature in the hydrophobic expansion tank 1 through the desalted water to avoid damage to the hydrophobic expansion tank 1.
[0067] The outlet end of the high-pressure supply pipe 15 is connected to the drain expansion tank 1 so that the high-pressure drain of the power plant is supplied to the drain expansion tank 1 through the high-pressure supply pipe 15. The outlet end of the low-pressure supply pipe 16 is connected to the drain tank 17 so that the low-pressure drain of the power plant is supplied to the drain 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 the 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 the opening degree of the high-pressure supply pipe 15.
[0068] Preferably, all the stop valves, control valve 141 and regulating valve 92 in the embodiment of the present invention are electric to achieve automatic operation.
[0069] In the description of the present invention, it should be understood that the terms "first" and "second" are only used for distinction, and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0070] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0071] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
[0072] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. 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 present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.
[0073] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.
Claims
1. A hydrophobic system, characterized in that: include: Hydrophobic expansion vessel (1); Drain tank (17); A first drain connection pipe (3), the first drain connection pipe (3) is connected between the drain expansion tank (1) and the drain tank (17) to supply drain in the drain expansion tank (1) to the drain tank (17), the first drain connection pipe (3) having a Y-shaped valve (31), a first drain valve (32) and a first check valve (33).
2. The hydrophobic system according to claim 1, characterized in that: The invention also comprises a second hydrophobic connecting pipe (2), wherein the second hydrophobic connecting pipe (2) is connected between the hydrophobic expansion tank (1) and the hydrophobic tank (17), the second hydrophobic connecting pipe (2) has a second stop valve (21), and the first hydrophobic connecting pipe (3) has a first stop valve (34).
3. The hydrophobic system according to claim 2, characterized in that: Also includes: A main stop valve (4), the main stop valve (4) being connected to the drain tank (17), and the main stop valve (4) being connected to the inlet end of the first drain connecting pipe (3) and the inlet end of the second drain connecting pipe (2); A first drain pipe (5), the first drain pipe (5) being connected to the first drain connection pipe (3), the first drain pipe (5) having a first drain stop valve (51); A second drain pipe (6), the second drain pipe (6) is connected to the second drain connection pipe (2), and the second drain pipe (6) has a second drain stop valve (61).
4. The hydrophobic system according to claim 3, characterized in that: The first stop valve (34), the Y-shaped valve (31), the first steam trap (32) and the first check valve (33) are arranged in sequence along the direction of steam flow in the first steam trap connecting pipe (3), and the connection position between the first drain pipe (5) and the first steam trap connecting pipe (3) is located between the first steam trap (32) and the first check valve (33).
5. The hydrophobic system according to claim 1, characterized in that: The first steam trap (32) has a filter.
6. The hydrophobic system according to claim 1, characterized in that: Also includes: A drain pump (7), wherein the drain pump (7) is connected to the drain tank (17); a drain release pipe (8), wherein the inlet end of the drain release pipe (8) is connected to the drain pump (7) to obtain drain supplied by the drain pump (7) from the drain tank (17), and the outlet end of the drain release pipe (8) is used to connect to a deaerator; A regulating valve group (9), the regulating valve group (9) is connected between the drain release pipe (8) and the drain tank (17) to control the drain in the drain release pipe (8) to flow back into the drain tank (17), and along the direction of drain flow in the drain release pipe (8), the connection position between the drain release pipe (8) and the drain release pipe (8) is located downstream of the connection position between the drain pump (7) and the drain release pipe (8).
7. The hydrophobic system according to claim 6, characterized in that: The regulating valve group (9) comprises a first branch and a second branch connected in parallel, the first branch having 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) being arranged in sequence along the drainage flow direction in the first branch, and the second branch having a fifth stop valve (94).
8. The hydrophobic system according to claim 6, characterized in that: The invention also comprises a second check valve (10), a sixth stop valve (11) and a first gate valve (12), wherein 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 to the drain tank (17), there are at least two drain pumps (7), each of the drain pumps (7) is connected to the drain tank (17) via the first gate valve (12), and a corresponding second check valve (10) and a sixth stop valve (11) are provided between each of the drain pumps (7) and the drain release pipe (8).
9. The hydrophobic system according to claim 1, characterized in that: The invention also comprises a steam release pipe (13), wherein the inlet end of the steam release pipe (13) is connected to the hydrophobic expansion tank (1), and the outlet end of the steam release pipe (13) is used to connect to a deaerator so as to supply the steam in the hydrophobic expansion tank (1) to the deaerator, and the steam release pipe (13) has a second gate valve (131) and a third check valve (132).
10. The hydrophobic system according to claim 1, characterized in that: Also includes: a desalted water pipe (14), the desalted water pipe (14) being connected to the hydrophobic expansion tank (1), the desalted water pipe (14) being used to supply desalted water to the hydrophobic expansion tank (1), the desalted water pipe (14) being provided with a control valve (141); A high-pressure supply pipe (15), the high-pressure supply pipe (15) being connected to the hydrophobic expansion tank (1), and the high-pressure supply pipe (15) being used to supply high-pressure hydrophobic water into the hydrophobic expansion tank (1); A low-pressure supply pipe (16), the low-pressure supply pipe (16) is connected to the drain tank (17), and the low-pressure supply pipe (16) is used to supply low-pressure drain into the drain tank (17).