Low-vacuum heating device of steam turbine

Abstract

The utility model relates to the technical field of heating equipment, in particular to a low-vacuum heating device of a steam turbine, which comprises the steam turbine, a condenser and a cooling tower, and is technically characterized in that a water inlet valve is arranged on an inlet pipeline of the cooling tower, and a buffer isolation tank positioned on the inlet side of the water inlet valve is arranged on an output pipeline of the condenser; a longitudinal partition plate is fixedly suspended on the inner top face of the buffer isolation tank, a set distance is formed between the lower end of the longitudinal partition plate and the bottom of the buffer isolation tank, and the buffer isolation tank is divided into a left liquid discharging cavity and a right liquid discharging cavity through the longitudinal partition plate. A vacuumizing branch communicated with a vacuumizing pipeline of the condenser is arranged on the top face of the left liquid inlet cavity, a discharge pipeline is arranged at the bottom of the buffer isolation tank, and a heat exchange heating unit is arranged between the lower end of the discharge pipeline and the tail section of the water return pipeline. The device solves the problem that the low vacuum degree in an existing water circulation low-vacuum heating system cannot be maintained easily, and the low vacuum degree adjusting precision can be improved easily.

Description

Technical Field

[0001] This utility model relates to the field of heating equipment technology, specifically to a steam turbine low-vacuum heating device. Background Technology

[0002] A steam turbine is an external combustion rotary machine that converts the thermal energy of steam into mechanical work. Steam from the boiler enters the turbine and passes through a series of annularly arranged nozzles and blades, converting the steam's thermal energy into the mechanical energy of the turbine rotor's rotation. In existing technology, the steam, carrying a large amount of waste heat, exits the turbine and goes to the condenser. The condenser converts the steam into hot water, which is then piped to heating terminals, thus achieving waste heat recovery and utilization.

[0003] For example, CN 113819511 A discloses a circulating water low-vacuum heating system, which includes a steam turbine condenser. The output end of the steam turbine condenser is connected to a cooling tower via a cooling delivery pipe. The input end of the cooling tower is connected to the output end of the steam turbine condenser via a cooling delivery pipe. The output end of the cooling tower and the input end of the steam turbine condenser are connected via a cooling return pipe. This heating system adjusts and lowers the vacuum degree of the steam turbine condenser, thereby increasing the exhaust steam temperature of the steam turbine condenser to heat the cooling circulating water. The heated cooling circulating water can be transported to a heat exchanger via a circulating delivery pipe. After passing through the heat exchanger, the circulating water is further heated by steam and then delivered to the heating pipeline for residential heating, avoiding the waste of steam heat. However, the following problems still exist: 1. When the steam turbine condenser converts steam into hot water and discharges it to the heat exchanger through pipelines, steam is easily mixed into the water, which is not conducive to maintaining the low vacuum degree inside the system; 2. During the heating season, the isolation from the cooling tower side still needs to be improved. Utility Model Content

[0004] The purpose of this invention is to provide a steam turbine low-vacuum heating device with a reasonable structure and reliable operation, which solves the problem that the low vacuum degree is not easy to maintain in the existing water circulation low-vacuum heating system, greatly reduces the steam content in the hot water body, helps to improve the low vacuum degree adjustment accuracy, and also helps to improve the isolation performance between the heating and cooling sides during the heating season.

[0005] The technical solution of this utility model is:

[0006] A low-vacuum heating device for a steam turbine includes a steam turbine, a condenser connected to the turbine's tail steam pipeline, a cooling tower connected to the condenser's output pipeline, and a return water pipeline connecting the cooling tower outlet and the condenser's cooling inlet. The key technical features are: an inlet valve is provided on the cooling tower's inlet pipeline; a buffer isolation tank is provided on the condenser's output pipeline located on the inlet side of the inlet valve; a longitudinal baffle is suspended on the inner top surface of the buffer isolation tank; and a set distance is provided between the lower end of the longitudinal baffle and the bottom of the buffer isolation tank. The longitudinal partition separates the buffer isolation tank into a left inlet chamber and a right outlet chamber. The upper part of the left inlet chamber is connected to the end of the condenser's output pipeline, and the upper part of the right outlet chamber is connected to the inlet pipeline of the cooling tower. The top surface of the left inlet chamber is provided with a vacuum branch connected to the condenser's vacuum pipeline. The bottom of the buffer isolation tank is provided with a discharge pipeline. A heat exchange heating unit is provided between the lower end of the discharge pipeline and the end of the return water pipeline. A first shut-off valve and a flow regulating valve are sequentially provided on the discharge pipeline.

[0007] The aforementioned steam turbine low-vacuum heating device includes a heat exchange heating unit comprising a branch pipe connected to the lower end of the discharge pipe, a heat exchanger connected to the end of each branch of the branch pipe, a manifold connected to the shell-side outlet pipe of each heat exchanger, and a circulating heat exchange assembly connected between the tube-side inlet and tube-side outlet of the heat exchanger. The end of the manifold is connected to the return water pipe. A first transfer pump is provided at the beginning of the branch pipe. A second shut-off valve is provided on each branch of the branch pipe. A third shut-off valve and a first temperature sensor are provided on the shell-side outlet pipe of the heat exchanger. A fourth shut-off valve is provided at the end of the manifold.

[0008] In the aforementioned steam turbine low-vacuum heating device, a return water pump is installed on the return water pipeline, and a fifth shut-off valve is installed at the outlet of the return water pump.

[0009] In the aforementioned low-vacuum heating device for steam turbines, a bypass branch is provided between the inlet side of the first shut-off valve and the inlet side of the buffer isolation tank, and a sixth shut-off valve is provided on the bypass branch. The bypass branch facilitates maintenance of the buffer isolation tank.

[0010] In the aforementioned low-vacuum heating device for steam turbines, an isolation frame is provided at the top of the right drain chamber of the buffer isolation tank, and a water passage hole group is provided on the bottom surface of the isolation frame. The inlet of the cooling tower's water inlet valve is connected to the space enclosed by the isolation frame. A longitudinal electric cylinder corresponding to the isolation frame is fixed at the top of the buffer isolation tank, and a sealing plate for blocking the water passage hole group is provided at the lower end of the cylinder rod of the longitudinal electric cylinder.

[0011] The aforementioned steam turbine low-vacuum heating device has multiple horizontal through holes on its longitudinal partition plate.

[0012] The aforementioned steam turbine low-vacuum heating device includes an inlet pipe and an outlet pipe connected to a heating terminal. A second temperature sensor is provided on the inlet pipe of the heating terminal, and a circulation pump is provided on the outlet pipe of the heating terminal.

[0013] The beneficial effects of this utility model are:

[0014] 1. A buffer isolation tank was added. The steam carried by the hot water entering the buffer isolation tank is discharged to the vacuum pipeline of the condenser through the vacuum branch, which greatly reduces the steam content in the hot water body and solves the problem that the low vacuum degree is not easy to maintain in the existing water circulation low vacuum heating system, which is conducive to improving the low vacuum degree regulation accuracy.

[0015] 2. The installation of a buffer isolation tank helps to improve the isolation performance between the tank and the cooling tower on the cold side. Attached Figure Description

[0016] Figure 1 This is a structural block diagram of the present invention;

[0017] Figure 2 yes Figure 1 A schematic diagram of the structure of the buffer isolation tank and its peripheral components.

[0018] In the diagram: 1. Steam turbine, 2. Condenser, 3. Vacuum pumping line, 4. Output line, 5. Buffer isolation tank, 6. Vacuum pumping branch, 7. Inlet valve, 8. Cooling tower, 9. Return water line, 10. Return water pump, 11. Fifth shut-off valve, 12. First shut-off valve, 13. Flow regulating valve, 14. Bypass branch, 15. Sixth shut-off valve, 16. Fourth shut-off valve, 17. Manifold, 18. First temperature sensor, 19. Third shut-off valve, 20. Heat exchanger, 21. Second shut-off valve, 22. Diverter line, 23. First transfer pump, 24. Circulation pump, 25. Heating terminal, 26. Outlet line, 27. Inlet line, 28. Second temperature sensor, 29. Longitudinal electric cylinder, 30. Longitudinal baffle, 31. Horizontal through hole, 32. Isolation frame, 33. Sealing plate. Detailed Implementation

[0019] The present invention will be described in detail with reference to the accompanying drawings.

[0020] like Figure 1 , Figure 2 As shown, the steam turbine low vacuum heating device includes a steam turbine 1, a condenser 2 connected to the tail steam pipeline of the steam turbine 1, a cooling tower 8 connected to the output pipeline 4 of the condenser 2, and a return water pipeline 9 connected between the outlet of the cooling tower 8 and the cooling port of the condenser 2.

[0021] The cooling tower 8 has an inlet valve 7 on its inlet pipe, and the condenser 2 has a buffer isolation tank 5 located on the inlet side of the inlet valve 7 on its outlet pipe 4. A longitudinal baffle 30 is suspended on the inner top surface of the buffer isolation tank 5. A set distance is provided between the lower end of the longitudinal baffle 30 and the bottom of the buffer isolation tank 5. The longitudinal baffle 30 separates the buffer isolation tank 5 into a left inlet chamber and a right outlet chamber. The upper part of the left inlet chamber is connected to the end of the condenser 2 outlet pipe 4, and the upper part of the right outlet chamber is connected to the cooling tower 8 inlet pipe. A vacuum branch 6 connected to the condenser 2 vacuum pipe 3 is provided on the top surface of the left inlet chamber. In this embodiment, the top of the right drain chamber of the buffer isolation tank 5 is provided with an isolation frame 32, and the bottom surface of the isolation frame 32 is provided with a group of water passage holes. The inlet of the water inlet valve 7 of the cooling tower 8 is connected to the space enclosed by the isolation frame 32. A longitudinal electric cylinder 29 corresponding to the isolation frame 32 is fixed on the top of the buffer isolation tank 5. The lower end of the cylinder rod of the longitudinal electric cylinder 29 is provided with a sealing plate 33 for blocking the group of water passage holes. The longitudinal partition plate 30 is provided with a plurality of horizontal through holes 31.

[0022] The bottom of the buffer isolation tank 5 is provided with a discharge pipeline, on which a first shut-off valve 12 and a flow regulating valve 13 are sequentially installed. In this embodiment, a bypass branch 14 is provided between the inlet side of the first shut-off valve 12 and the inlet side of the buffer isolation tank 5, and a sixth shut-off valve 15 is provided on the bypass branch 14. The bypass branch 14 facilitates maintenance of the buffer isolation tank 5.

[0023] A heat exchange and heating unit is provided between the lower end of the discharge pipe and the end of the return water pipe 9. In this embodiment, the heat exchange and heating unit includes a branch pipe 22 connected to the lower end of the discharge pipe, three heat exchangers 20 connected to the ends of the three branch pipes of the branch pipe 22, a manifold pipe 17 connected to the shell-side outlet pipes of the three heat exchangers 20, and a circulating heat exchange assembly connected between the tube-side inlet and tube-side outlet of the heat exchangers 20. The end of the manifold pipe 17 is connected to the return water pipe 9. The starting section of the branch pipe 22 is provided with a first transfer pump 23. Each branch pipe of the branch pipe 22 is provided with a second shut-off valve 21. The shell-side outlet pipe of the heat exchangers 20 is provided with a third shut-off valve 19 and a first temperature sensor 18. The end of the manifold pipe 17 is provided with a fourth shut-off valve 16. The circulating heat exchange assembly includes an inlet pipe 27 and an outlet pipe 26 connected to the heating terminal 25. A second temperature sensor 28 is provided on the inlet pipe 27 of the heating terminal 25, and a circulating pump 24 is provided on the outlet pipe 26 of the heating terminal 25. A return water pump 10 is provided on the return water pipe 9, and a fifth shut-off valve 11 is provided at the outlet of the return water pump 10.

[0024] Working principle:

[0025] 1. During the non-heating season, the steam that has done work in the steam turbine carries a large amount of waste heat out of the steam turbine 1 and goes to the condenser 2. After being condensed in the condenser 2, it forms hot water, which then enters the cooling tower 8 through the water passage group of the buffer isolation tank 5 and the water inlet valve 7. After being cooled and cooled by the cooling tower 8, it is sent back to the condenser 2 to protect the condenser 2 and prevent it from being damaged at high temperatures.

[0026] 2. During the heating season, the inlet valve 7 and the fifth shut-off valve 11 are closed, while the first shut-off valve 12, the flow regulating valve 13, the second shut-off valve 21, the third shut-off valve 19, and the fourth shut-off valve 16 are open. The steam, after performing work in the turbine 1, carries a large amount of waste heat out of the turbine and flows to the condenser 2. After condensation in the condenser 2, it forms hot water, which then enters the buffer tank 5. During the flow, the steam carried by the hot water is discharged through the vacuum branch 6 to the vacuum pipeline 3 of the condenser 2. The hot water passes through the first shut-off valve 12 and the flow regulating valve 13 into the branch pipeline 22, and then is sent from the branch pipeline 22 to each heat exchanger 20. The water after heat exchange returns to the condenser 2 through the manifold 17. The circulating heat exchange components absorb the waste heat from the hot water for use in the heating terminal 25, achieving waste heat recovery and utilization.

[0027] The embodiments of this utility model have been described in detail above, but the content described is only a preferred embodiment of this utility model and should not be considered as limiting the scope of implementation of this utility model. All equivalent changes and improvements made within the scope of this utility model should still fall within the scope of this utility model.

Claims

1. A low-vacuum heating device for a steam turbine, comprising a steam turbine, a condenser connected to the tail steam pipeline of the steam turbine, a cooling tower connected to the output pipeline of the condenser, and a return water pipeline connecting the outlet of the cooling tower and the cooling port of the condenser, characterized in that: The cooling tower has an inlet valve on its inlet pipe, and the condenser has a buffer isolation tank located at the inlet side of the inlet valve on its outlet pipe. A longitudinal baffle is suspended on the inner top surface of the buffer isolation tank. A set distance is provided between the lower end of the longitudinal baffle and the bottom of the buffer isolation tank. The longitudinal baffle separates the buffer isolation tank into a left inlet chamber and a right outlet chamber. The upper part of the left inlet chamber is connected to the end of the condenser's outlet pipe, and the upper part of the right outlet chamber is connected to the cooling tower's inlet pipe. A vacuum branch is provided on the top surface of the left inlet chamber, which is connected to the condenser's vacuum pipe. The bottom of the buffer isolation tank has a discharge pipe. A heat exchange heating unit is provided between the lower end of the discharge pipe and the end of the return water pipe. A first shut-off valve and a flow regulating valve are sequentially provided on the discharge pipe.

2. The steam turbine low-vacuum heating device according to claim 1, characterized in that: The heat exchange heating unit includes a branch pipe connected to the lower end of the discharge pipe, a heat exchanger connected to the end of each branch of the branch pipe, a manifold connected to the shell-side outlet pipe of each heat exchanger, and a circulating heat exchange assembly connected between the tube-side inlet and tube-side outlet of the heat exchanger. The end of the manifold is connected to the return water pipe. The starting section of the branch pipe is equipped with a first transfer pump. Each branch of the branch pipe is equipped with a second shut-off valve. The shell-side outlet pipe of the heat exchanger is equipped with a third shut-off valve and a first temperature sensor. The end of the manifold is equipped with a fourth shut-off valve.

3. The steam turbine low-vacuum heating device according to claim 1, characterized in that: A return water pump is installed on the return water pipeline, and a fifth shut-off valve is installed at the outlet of the return water pump.

4. The steam turbine low-vacuum heating device according to claim 1, characterized in that: A bypass branch is provided between the inlet side of the first shut-off valve and the inlet side of the buffer isolation tank, and a sixth shut-off valve is provided on the bypass branch.

5. The steam turbine low-vacuum heating device according to claim 1, characterized in that: The top of the right drain chamber of the buffer isolation tank is provided with an isolation frame, and the bottom surface of the isolation frame is provided with a group of water passage holes. The inlet of the cooling tower's water inlet valve is connected to the space surrounded by the isolation frame. The top of the buffer isolation tank is fixed with a longitudinal electric cylinder corresponding to the isolation frame, and the lower end of the cylinder rod of the longitudinal electric cylinder is provided with a sealing plate for blocking the group of water passage holes.

6. The steam turbine low-vacuum heating device according to claim 1, characterized in that: The longitudinal partition has multiple horizontal through holes.

7. The steam turbine low-vacuum heating device according to claim 2, characterized in that: The circulating heat exchange assembly includes an inlet pipe and an outlet pipe connected to a heating terminal. A second temperature sensor is provided on the inlet pipe of the heating terminal, and a circulating pump is provided on the outlet pipe of the heating terminal.

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