Condensed water operation system of steam turbine generator unit

Abstract

The utility model relates to a condensed water operation system of a steam turbine generator unit, which comprises a main machine condenser. A condensed water outlet of the main machine condenser is sequentially connected with a condensed water pump, condensed water fine processing equipment, a shaft seal cooler, a heat supply network drain cooler, a low-pressure heater drain cooler, a first heat exchanger, a second heat exchanger, a third heat exchanger, a fourth heat exchanger, a fifth heat exchanger and a boiler in series through a pipeline, and the first heat exchanger, the second heat exchanger, the third heat exchanger, the fourth heat exchanger and the fifth heat exchanger are arranged in the main machine condenser. An outlet of the condensate polishing device is connected with a cold water pipeline leading to the adjacent steam turbine generator unit, an outlet of the fifth heat exchanger is connected with a hot water pipeline leading to the adjacent steam turbine generator unit, a first control valve set is arranged on the upstream of the cold water pipeline, and a first control valve is arranged on the hot water pipeline. The device has the advantages of being simple and reasonable in structural design, reducing the safety risk of an operation unit, greatly reducing the operation time of the main machine condensate pump in the starting and stopping stages, and being obvious in energy-saving effect.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbine generator set operation, in particular to a condensate water operation system of a steam turbine generator set. Background Art

[0002] A steam turbine generator is a generator driven by a steam turbine. Superheated steam generated by the boiler enters the turbine, where it expands and generates work, rotating the blades and driving the generator to generate electricity. The exhaust steam from this work is then returned to the boiler for recycling via the condenser, circulating water pump, condensate pump, and feedwater heating system.

[0003] At present, conventional steam turbine generator sets require the main engine condensate pump to operate for flushing during startup and shutdown, as well as for low-pressure cylinder water spraying, which consumes a lot of electricity.

[0004] Based on this, it is necessary to develop a condensate operation system for steam turbine generator sets. By modifying the original condensate interconnection method of the unit, the safety risk of the operating unit is reduced, and the operating time of the main condensate pump during the startup and shutdown stages is greatly reduced, with obvious energy-saving effects. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a condensate water operation system for a steam turbine generator set, which effectively overcomes the defects of the prior art.

[0006] The technical solution of the utility model to solve the above technical problems is as follows:

[0007] A condensate operation system for a steam turbine generator set includes a main engine condenser, wherein the condensate outlet of the main engine condenser is connected in series via a pipeline to a condensate pump, a condensate polishing device, a shaft seal cooler, a heat network drain cooler, a low-pressure heater drain cooler, a first heat exchanger, a second heat exchanger, a third heat exchanger, a fourth heat exchanger, a fifth heat exchanger and a boiler arranged in the main engine condenser, the outlet of the condensate polishing device is connected to a cold water pipeline leading to an adjacent steam turbine generator set, the outlet of the fifth heat exchanger is connected to a hot water pipeline leading to an adjacent steam turbine generator set, a first control valve group is provided upstream of the cold water pipeline, and a first control valve is provided on the hot water pipeline.

[0008] On the basis of the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, second control valves are respectively provided on the upstream and downstream pipelines of the above-mentioned heat network drain cooler, and a first bypass pipeline is connected between the upstream and downstream pipelines of the above-mentioned heat network drain cooler, and a third control valve is provided on the first bypass pipeline.

[0010] Furthermore, a second bypass pipeline is connected between the downstream pipeline of the above-mentioned heat network drain cooler and the downstream pipeline of the second heat exchanger, and a fourth control valve is provided on the above-mentioned second bypass pipeline. A fifth control valve is provided near the inlet of the upstream pipeline of the above-mentioned low-temperature heat drain cooler, and a sixth control valve is provided near the outlet of the downstream pipeline of the above-mentioned second heat exchanger.

[0011] Furthermore, the downstream pipeline of the shaft seal cooler is also connected to the main engine condenser through a circulation pipeline, and a second control valve group is provided on the circulation pipeline.

[0012] Furthermore, the condensate pumps are provided in two groups, and the condensate outlet of the main engine condenser is connected to the condensate polishing equipment through two pipelines, and each of the two pipelines is provided with a group of the condensate pumps.

[0013] Furthermore, it also includes a circulating water return pipeline. The above-mentioned cold water pipeline is connected to the circulating water return pipeline through a first branch pipeline, and a seventh control valve is provided on the first branch pipeline.

[0014] Furthermore, the condensate polishing equipment has a wastewater pump, which is connected to the circulating water return pipe through a pipeline.

[0015] Furthermore, the downstream pipeline of the fifth heat exchanger is connected to the circulating water return pipeline through a second branch pipeline, and an eighth control valve is provided on the second branch pipeline.

[0016] Furthermore, a pressure gauge is provided on the upstream pipeline of the condensate pump.

[0017] Furthermore, the first heat exchanger, the second heat exchanger, the third heat exchanger, the fourth heat exchanger and the fifth heat exchanger are all low-pressure heaters.

[0018] The beneficial effects of the utility model are: simple and reasonable structural design, reduced safety risks of running units, greatly reduced operating time of the host condensate pump during start-up and shutdown stages, and obvious energy-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural schematic diagram of the condensate operation system of the steam turbine generator set of the present invention.

[0020] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0021] 1. Main unit condenser; 2. Condensate pump; 3. Condensate polishing equipment; 4. Shaft seal cooler; 5. Heat network drain cooler; 6. Low-pressure heater drain cooler; 7. First heat exchanger; 8. Second heat exchanger; 9. Third heat exchanger; 10. Fourth heat exchanger; 11. Fifth heat exchanger; 20. Cold water pipeline; 30. Hot water pipeline; 51. First bypass pipeline; 41. Second bypass pipeline; 60. Circulating water return pipeline; 71. Circulating pipeline. DETAILED DESCRIPTION

[0022] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0023] Example

[0024] like Figure 1 As shown, the condensate operation system of the steam turbine generator set in this embodiment includes a main engine condenser 1, and the condensate outlet of the main engine condenser 1 is connected in series with a condensate pump 2, a condensate polishing device 3, a shaft seal cooler 4, a heat network drain cooler 5, a low-pressure drain cooler 6, a first heat exchanger 7, a second heat exchanger 8, a third heat exchanger 9, a fourth heat exchanger 10, a fifth heat exchanger 11 and a boiler arranged in the main engine condenser 1 through a pipeline. The outlet of the condensate polishing device 3 is connected to a cold water pipeline 20 leading to an adjacent steam turbine generator set, and the outlet of the fifth heat exchanger 11 is connected to a hot water pipeline 30 leading to an adjacent steam turbine generator set. A first control valve group is provided upstream of the cold water pipeline 20, and a first control valve is provided on the hot water pipeline 30.

[0025] The operation method of the condensate operation system of the steam turbine generator set in this embodiment is as follows:

[0026] Connect the cold water pipeline 20 and hot water pipeline 30 downstream of the unit's refined condensate and downstream of the fifth heat exchanger 11. During the initial startup phase of the unit, the refined condensate is delivered to the cold water pipeline 20 and sent to the condensate users of adjacent units, without starting the adjacent units' condensate pumps. After the unit is shut down, the refined condensate is delivered to the condensate users of adjacent units, allowing the unit to be shut down immediately after the temporary condensate pumps are shut down. During unit startup flushing, the fifth heat exchanger 11 of the operating unit delivers refined condensate to the adjacent units, allowing the adjacent units to be flushed without starting their condensate pumps. This allows for flow control of the condensate flushing of the adjacent units, reducing safety risks for the operating units.

[0027] In this embodiment, second control valves are installed on the upstream and downstream pipelines of the heat network drain cooler 5. A first bypass line 51 is connected between the upstream and downstream pipelines of the heat network drain cooler 5. This first bypass line 51 is equipped with a third control valve. The second and third control valves allow for flexible adjustment of the flow rate and open / close status of the corresponding pipelines. Furthermore, the first bypass line 51 ensures the proper flow of condensate during maintenance of the heat network drain cooler 5.

[0028] In this embodiment, a second bypass line 41 is connected between the downstream pipeline of the heat network drain cooler 5 and the downstream pipeline of the second heat exchanger 8. A fourth control valve is installed on this second bypass line 41. A fifth control valve is installed near the inlet of the upstream pipeline of the LP heater drain cooler 6, and a sixth control valve is installed near the outlet of the downstream pipeline of the second heat exchanger 8. By opening the second bypass line 41 and closing the section of pipeline connecting the LP heater drain cooler 6 and the second heat exchanger 8, maintenance and repair of the LP heater drain cooler 6, the first heat exchanger 7, and the second heat exchanger 8 can be performed.

[0029] In this embodiment, the downstream pipeline of the shaft seal cooler 4 is further connected to the main engine condenser 1 via a circulation pipeline 71. A second control valve group is provided on the circulation pipeline 71. The circulation pipeline 71 can return condensed water to the main engine condenser 1 to form a circulation.

[0030] In this embodiment, two sets of condensate pumps 2 are provided. The condensate outlet of the main engine condenser 1 is connected to the condensate polishing equipment 3 via two pipelines, each of which is equipped with a set of condensate pumps 2. This ensures a "one standby, one active" system, making it safer and more convenient to use.

[0031] This embodiment further includes a circulating water return pipe 60. The cold water line 20 is connected to the circulating water return pipe 60 via a first branch pipe. A seventh control valve is provided on the first branch pipe. Opening the seventh control valve allows drainage (draining) from the corresponding pipe section to the circulating water return pipe 60.

[0032] In this embodiment, the condensate polishing equipment 3 includes a wastewater pump, which is connected to the circulating water return pipe 60 via a pipeline. The wastewater can be discharged into the circulating water return pipe 60 via the pipeline.

[0033] In this embodiment, the downstream pipeline of the fifth heat exchanger 11 is connected to the circulating water return pipeline 60 via a second branch pipeline, and the second branch pipeline is provided with an eighth control valve. Through this pipeline, condensate from the fifth heat exchanger 11 can be discharged into the circulating water return pipeline 60.

[0034] In this embodiment, a pressure gauge is provided on the upstream pipeline of the condensate pump 2 to monitor the pressure in the pipeline in real time.

[0035] In this embodiment, the first heat exchanger 7 , the second heat exchanger 8 , the third heat exchanger 9 , the fourth heat exchanger 10 and the fifth heat exchanger 11 all adopt low-pressure heaters of suitable models on the market.

[0036] 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", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations 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 device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0038] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0039] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0040] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means 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 specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0041] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A condensate water operation system for a steam turbine generator set, characterized by: The invention comprises a main engine condenser (1), wherein the condensate outlet of the main engine condenser (1) is connected in series via a pipeline to a condensate pump (2), a condensate polishing device (3), a shaft seal cooler (4), a heat network drain cooler (5), a low-pressure heater drain cooler (6), a first heat exchanger (7) arranged in the main engine condenser (1), a second heat exchanger (8), a third heat exchanger (9), a fourth heat exchanger (10), a fifth heat exchanger (11) and a boiler, wherein the outlet of the condensate polishing device (3) is connected to a cold water pipeline (20) leading to an adjacent steam turbine generator set, and the outlet of the fifth heat exchanger (11) is connected to a hot water pipeline (30) leading to an adjacent steam turbine generator set, a first control valve group is provided upstream of the cold water pipeline (20), and a first control valve is provided on the hot water pipeline (30).

2. The condensate water operation system of a steam turbine generator set according to claim 1, characterized in that: A second control valve is provided on the upstream and downstream pipelines of the heat network drain cooler (5), respectively. A first bypass pipeline (51) is connected between the upstream and downstream pipelines of the heat network drain cooler (5), and a third control valve is provided on the first bypass pipeline (51).

3. The condensate water operation system of a steam turbine generator set according to claim 1, characterized in that: A second bypass pipeline (41) is connected between the downstream pipeline of the heat network drain cooler (5) and the downstream pipeline of the second heat exchanger (8), and a fourth control valve is provided on the second bypass pipeline (41). A fifth control valve is provided at a position near the inlet of the upstream pipeline of the low-temperature heat drain cooler (6), and a sixth control valve is provided at a position near the outlet of the downstream pipeline of the second heat exchanger (8).

4. The condensate operation system of a steam turbine generator set according to claim 1, characterized in that: The downstream pipeline of the shaft seal cooler (4) is also connected to the main engine condenser (1) through a circulation pipeline (71), and a second control valve group is provided on the circulation pipeline (71).

5. The condensate operation system of a steam turbine generator set according to claim 1, characterized in that: The condensate pumps (2) are provided in two groups, and the condensate outlet of the main engine condenser (1) is connected to the condensate polishing equipment (3) through two pipelines, and one group of the condensate pumps (2) is provided on each of the two pipelines.

6. The condensate water operation system of a steam turbine generator set according to claim 1, characterized in that: It also includes a circulating water return pipeline (60), the cold water pipeline (20) is connected to the circulating water return pipeline (60) via a first branch pipeline, and a seventh control valve is provided on the first branch pipeline.

7. The condensate operation system of a steam turbine generator set according to claim 6, characterized in that: The condensate polishing equipment (3) has a wastewater pump, which is connected to the circulating water return pipe (60) via a pipeline.

8. The condensate operation system of a steam turbine generator set according to claim 6, characterized in that: The downstream pipeline of the fifth heat exchanger (11) is connected to the circulating water return pipeline (60) through a second branch pipeline, and an eighth control valve is provided on the second branch pipeline.

9. The condensate operation system of a steam turbine generator set according to claim 1, characterized in that: A pressure gauge is provided on the upstream pipeline of the condensate pump (2).

10. The condensate operation system of a steam turbine generator set according to any one of claims 1 to 9, characterized in that: The first heat exchanger (7), the second heat exchanger (8), the third heat exchanger (9), the fourth heat exchanger (10) and the fifth heat exchanger (11) are all low-pressure heaters.

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