Secondary recovery system for condensed water of vacuum system of power plant

Abstract

The utility model relates to the technical field of power plants, and discloses a power plant vacuum system condensation water secondary recovery system which comprises a vacuum pump and a steam-water separator communicated with the vacuum pump through a first pipeline, the steam-water separator is communicated with a condensation water tank through an overflow pipe, and the condensation water tank is communicated with a steam exhaust device through a second pipeline. Compared with the prior art, the device has the advantages that secondary condensation water of a vacuum system is recycled, and the efficiency of a vacuum pump is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power plants, in particular to a secondary recovery system for condensate of a vacuum system of a power plant. Background Art

[0002] During the operation of the vacuum pump in a thermal power plant, a large amount of steam is extracted along with the non-condensable gas in the air-cooling island. After the non-condensable gas and steam extracted by the vacuum pump are cooled by the circulating liquid, a large amount of condensate is discharged to the steam-water separator and discharged through the overflow pipe. Affected by environmental factors, when the ambient temperature rises in summer, the back pressure of the unit increases, and the amount of steam entering the vacuum pump increases due to the increase in the exhaust steam temperature. The working fluid temperature of the vacuum pump is low (15°C in winter; 20°C in summer). Part of the non-condensable gas undergoes secondary condensation under the action of compression and cooling to produce a large amount of condensate, resulting in an excessively high liquid level inside the vacuum pump, reducing the efficiency of the vacuum pump. Utility Model Content

[0003] 1. Technical issues to be solved

[0004] The technical problem to be solved by the utility model is that the temperature is high in summer, the back pressure of the unit increases, the amount of steam entering the vacuum pump increases due to the increase in the exhaust steam temperature of the unit, the working fluid temperature of the vacuum pump is low, and part of the uncondensed gas undergoes secondary condensation under the action of compression and cooling to produce a large amount of condensed water, resulting in an excessively high liquid level inside the vacuum pump, thereby reducing the efficiency of the vacuum pump.

[0005] (II) Technical solution

[0006] In order to solve the above technical problems, the technical solution provided by the utility model is: a secondary condensate recovery system for a power plant vacuum system, comprising a vacuum pump and a steam-water separator connected to the vacuum pump through a first pipe, the steam-water separator is connected to a condensate tank through an overflow pipe, and the condensate tank is connected to a steam exhaust device through a second pipe.

[0007] As an improvement, a solenoid valve is connected to the first pipeline.

[0008] As an improvement, a stop valve is provided on the first pipeline.

[0009] As an improvement, a high-level overflow pipe is provided on the steam-water separator.

[0010] As an improvement, a first pneumatic butterfly valve and a first manual butterfly valve are provided in parallel on the overflow pipe.

[0011] As an improvement, a manual drain pipe and a conductivity device are provided on the upper part of the condensate tank, and a manual stop valve is provided on the upper part of the manual drain pipe.

[0012] As an improvement, a second pneumatic butterfly valve and a second manual butterfly valve are provided in parallel on the second pipeline.

[0013] (III) Beneficial effects

[0014] Compared with the prior art, the utility model has the following advantages: 1. It recovers secondary condensate of the vacuum system to reduce water consumption in power generation; 2. It ensures that the vacuum pump operates under the optimal liquid level condition to improve vacuum efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model.

[0016] As shown in the figure: 1. Vacuum pump; 2. First pipeline; 3. Solenoid valve; 4. High-level overflow pipe; 5. Steam-water separator; 6. First pneumatic butterfly valve; 7. Overflow pipe; 8. First manual butterfly valve; 9. Condensate tank; 10. Manual stop valve; 11. Second pipeline; 13. Second pneumatic butterfly valve; 14. Second manual butterfly valve; 15. Manual drain pipe; 20. Exhaust device; 23. Stop valve. DETAILED DESCRIPTION

[0017] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0018] In the description of the present invention: It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0019] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more, unless otherwise clearly defined.

[0020] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0022] Embodiment 1

[0023] Combined with Figure 1 A secondary condensate recovery system for a power plant vacuum system includes a vacuum pump 1 and a steam-water separator 5 connected to the vacuum pump 1 through a first pipe 2, the steam-water separator 5 is connected to a condensate tank 9 through an overflow pipe 7, and the condensate tank 9 is connected to a steam exhaust device 20 through a second pipe 11.

[0024] The first pipeline 2 is connected to a solenoid valve 3 , and the first pipeline is connected to a stop valve 23 . The solenoid valve 3 and the stop valve 23 are arranged in parallel.

[0025] The steam-water separator 5 is provided with a high-level overflow pipe 4 .

[0026] The overflow pipe 7 is provided with a first pneumatic butterfly valve 6 and a first manual butterfly valve 8 in parallel.

[0027] The condensate tank 9 is connected with a manual drain pipe 15 and a conductivity device 24 on its upper side, and the manual drain pipe 15 is connected with a manual stop valve 10 on its upper side.

[0028] A second pneumatic butterfly valve 13 and a second manual butterfly valve 14 are connected in parallel on the second pipeline 11 .

[0029] 1. Install a condensate tank in the vacuum pump system of the unit. The water inlet side of the condensate tank is connected to the overflow pipe 7 of the steam-water separator 5 of each vacuum pump of the unit. When the liquid level of the steam-water separator 5 exceeds the optimal liquid level of the vacuum pump 1, it enters the newly installed condensate tank 9 through the overflow pipe 7. The lower water outlet side of the condensate tank 9 is connected to the exhaust device 20 of the unit through the second pipeline 11. The second pipeline 11 is designed with a second pneumatic butterfly valve 13. The second pneumatic butterfly valve 13 is controlled by the remote analog quantity of the liquid level meter. When the liquid level of the condensate tank 9 is lower than 100mm, the second pneumatic butterfly valve 13 is closed, and when the liquid level is higher than 400mm, the second pneumatic butterfly valve 13 is opened.

[0030] 2. The lower part of the condensate tank 9 is equipped with a conductivity device 24 and a sewage pipe 15. If the water quality is not up to standard, it will be discharged to avoid condensate water pollution. The upper part of the condensate tank 9 is designed with an overflow pipe, which will overflow and discharge automatically when the liquid level is high.

[0031] 3. The overflow pipe 7 of the steam-water separator 5 of each vacuum pump of the unit is installed with the first pneumatic butterfly valve 6 interlocked with the liquid level gauge of the steam-water separator 5. When the liquid level is higher than the design value, the first pneumatic butterfly valve 6 of the overflow pipe 7 is automatically opened. When the liquid level gauge of the condensate tank 9 is low, the first pneumatic butterfly valve 6 of the overflow pipe 7 is opened, and the condensate enters the condensate tank 9. When the liquid level gauge of the condensate tank 9 is high, the first pneumatic butterfly valve 6 of the overflow pipe 7 is closed, and the condensate is discharged from the high-level overflow pipe 4 set on the upper part of the overflow pipe 7.

[0032] 4. The lower drain pipe of each vacuum pump steam-water separator 5 is connected to the overflow pipe 7. When the amount of condensed water is too large in hot weather, open the first manual butterfly valve 8 to discharge water to prevent the overflow from failing to meet the condensed water discharge, and the continuous high liquid level will cause cavitation and cracks on the impeller.

[0033] All features described in the specification, the attached claims and the drawings, whether alone or in any combination thereof, are important features of the present utility model.

[0034] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "an implementation", "specific implementation", "other implementations", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment, implementation or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described above may also be combined in a suitable manner in any one or more embodiments, implementations or examples. The technical solution recorded in the utility model also includes a technical solution formed by any one or more of the specific features, structures, materials or characteristics described above in a separate or combined manner.

[0035] Although the embodiments of the utility model have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the utility model. Ordinary technicians in the field can change, modify, replace, modify, delete some features, add features or re-combine features to form a technical solution in the above embodiments without departing from the principles and purpose of the utility model within the scope of the utility model. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the innovative principles of the utility model are still within the scope of the technical solution of the utility model.

Claims

1. A secondary condensate recovery system for a power plant vacuum system, comprising a vacuum pump and a steam-water separator connected to the vacuum pump through a first pipeline, characterized in that: The steam-water separator is connected to a condensate tank via an overflow pipe, and the condensate tank is connected to a steam exhaust device via a second pipeline.

2. A power plant vacuum system condensate secondary recovery system according to claim 1, characterized in that: The first pipeline is connected with a solenoid valve.

3. The condensate secondary recovery system of a power plant vacuum system according to claim 1 is characterized by: The first pipeline is connected with a stop valve.

4. The secondary condensate recovery system of a power plant vacuum system according to claim 1 is characterized by: The steam-water separator is provided with a high-position overflow pipe.

5. The secondary condensate recovery system of a power plant vacuum system according to claim 1 is characterized by: The overflow pipe is provided with a first pneumatic butterfly valve and a first manual butterfly valve in parallel.

6. The secondary condensate recovery system of a power plant vacuum system according to claim 1, characterized in that: The condensate water tank is connected with a manual sewage pipe and a conductivity device on the upper part, and the manual sewage pipe is connected with a manual stop valve on the upper part.

7. The secondary condensate recovery system of a power plant vacuum system according to claim 1, characterized in that: A second pneumatic butterfly valve and a second manual butterfly valve are arranged in parallel on the second pipeline.

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