Steam turbine dead steam condensate recovery system

Abstract

The utility model discloses a steam turbine dead steam condensate recovery system which comprises two liquid drainage main pipes arranged side by side, the ends of the two liquid drainage main pipes are connected with sewage treatment systems, pipe bodies of the two liquid drainage main pipes are connected with recovery units, and the recovery units are far away from end collection systems of the liquid drainage main pipes. The connection point of the recovery unit and the liquid discharge header pipe is higher than the collection system, the bottom of the collection system is connected with a rehydrator through a liquid return limiting unit, and the height of the liquid return limiting unit is consistent with that of the rehydrator. The steam turbine dead steam condensate recovery device effectively recovers steam turbine dead steam condensate, reduces waste of water resources, prevents high-quality steam condensate from being directly discharged to a sewage treatment system, can effectively reduce treatment cost of the sewage treatment system, and relieves sewage discharge pressure of production enterprises.

Description

Technical Field

[0001] The utility model belongs to the technical field of spent steam condensate recovery equipment, and in particular relates to a steam turbine spent steam condensate recovery system. Background Art

[0002] During normal operation of condensing or back-pressure high-pressure steam turbines, a large amount of high-quality steam condensate will be continuously discharged into the sewage treatment system at the steam ejector, atmospheric safety valve water seal outlet, steam seal condenser, quick-closing valve body stem condensate discharge point and cylinder condensate discharge point of the condensing or back-pressure high-pressure steam turbines.

[0003] Since the pressure of the exhaust steam condensate system of condensing and back-pressure high, medium and low pressure steam turbines is normal pressure, the high-quality steam condensate cannot be effectively recycled, so the production enterprises can only discharge it into the sewage treatment system, which not only causes serious waste of high-quality water resources, but also increases the amount of sewage discharged for treatment, further increasing the operating costs of the production enterprises. Utility Model Content

[0004] The utility model aims to provide a steam turbine spent steam condensate recovery system, which solves the problem in the prior art that high-quality steam condensate cannot be effectively recovered and utilized.

[0005] The technical solution adopted by the utility model is that the turbine exhaust steam condensate recovery system includes two drainage main pipes arranged side by side, the ends of the two drainage main pipes are connected to the sewage treatment system, the pipe bodies of the two drainage main pipes are connected to the recovery unit, the recovery unit is far away from the end collection system of the drainage main pipe, the connection point between the recovery unit and the drainage main pipe is higher than the collection system, the bottom of the collection system is connected to the rehydrator through the liquid return limiting unit, and the height of the liquid return limiting unit is consistent with the height of the rehydrator.

[0006] The utility model is also characterized in that:

[0007] The pipe bodies of the two drainage main pipes are both connected with drainage valves, and the drainage valves are arranged between the connection point between the recovery unit and the drainage main pipe and the sewage treatment system.

[0008] The recovery unit includes a recovery pipe, one end of which is connected to the drainage main pipe, and the drainage valve is arranged between the connection point between the recovery pipe and the drainage main pipe and the sewage treatment system. The end of the recovery pipe away from the drainage main pipe is connected to the collection system, and the pipe body of the recovery pipe is connected to the recovery valve, which is arranged close to the drainage main pipe.

[0009] The collection system includes a water tank, which is arranged below the connection point of the recovery pipe and the drainage main pipe. The water tank is connected to the recovery pipe, and the bottom of the water tank is connected to the return liquid limiting unit. The inner bottom surface of the water tank is also connected to a liquid level switch, which is arranged at the connection point of the return liquid limiting unit and the water tank.

[0010] The liquid return limiting unit includes a liquid return pipe, which is connected to the bottom of the water tank. The liquid level switch is arranged at the connection point between the liquid return pipe and the water tank. The end of the liquid return pipe away from the water tank is connected to a U-shaped tube. The height of the U-shaped tube is consistent with the height of the rehydrator. The end of the U-shaped tube away from the liquid return pipe is connected to the rehydrator through a delivery pipe.

[0011] The body of the liquid return pipe is connected with a liquid return valve, which is arranged close to the water tank; the body of the delivery pipe is connected with a delivery valve, which is arranged close to the rehydration device.

[0012] One side wall of the water tank is respectively connected with an overflow pipe and a shower pipe, the overflow pipe is arranged near the top of the water tank, the shower pipe is arranged near the bottom of the water tank, and the pipe body of the shower pipe is connected with a shower valve.

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

[0014] The utility model discloses a steam turbine exhaust condensate recovery system, which uses the pressure difference between the rehydrator and the water tank as the conveying power of the condensate in the water tank, and utilizes the height difference between the water tank and the exhaust condensate of the steam turbine to naturally flow the exhaust condensate into the water tank through the conveying pipeline, thereby effectively recovering the exhaust condensate of the steam turbine and reducing the waste of water resources. Since the exhaust condensate of the steam turbine is effectively recovered, the direct discharge of high-quality steam condensate into the sewage treatment system is avoided, which can effectively reduce the treatment cost of the sewage system and alleviate the pressure of sewage discharge of the production enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model is a schematic diagram of the structure of the steam turbine exhaust condensate recovery system.

[0016] In the figure: 1. drainage main pipe, 101. drainage valve, 2. rehydration device, 3. recovery pipe, 301. recovery valve, 4. water tank, 5. liquid level switch, 6. return pipe, 601. return valve, 7. U-shaped pipe, 8. delivery pipe, 801. delivery valve, 9. overflow pipe, 10. shower pipe, 1001. shower valve. DETAILED DESCRIPTION

[0017] The utility model is described in detail below with reference to the accompanying drawings and specific implementation modes.

[0018] The utility model steam turbine exhaust condensate recovery system, such as Figure 1As shown, it includes two drainage main pipes 1 arranged side by side, the ends of the two drainage main pipes 1 are connected to the sewage treatment system, the pipe bodies of the two drainage main pipes 1 are connected to the recovery unit, the recovery unit is far away from the end collection system of the drainage main pipe 1, the connection point between the recovery unit and the drainage main pipe 1 is higher than the collection system, and the bottom of the collection system is connected to the rehydrator 2 through the liquid return limiting unit, and the height of the liquid return limiting unit is consistent with the height of the rehydrator 2. The two drainage main pipes 1 are respectively the condensing (negative pressure) steam turbine exhaust steam condensate pipes and the back pressure type high, medium and low pressure steam turbine exhaust steam condensate pipes. The exhaust steam condensate enters the collection system from the two drainage main pipes 1 through the recovery unit under the action of the height difference. The pressure difference between the collection system and the rehydrator 2 is used as the power of the condensate in the collection system. The condensate enters the rehydrator 2 under the action of pressure. The liquid return limiting unit at the same height as the rehydrator 2 can prevent the condensate in the rehydrator 2 from flowing back.

[0019] Example 1

[0020] The pipe bodies of the two drainage main pipes 1 are both connected with drainage valves 101, and the drainage valves 101 are arranged between the connection point between the recovery unit and the drainage main pipe 1 and the sewage treatment system. The drainage valves 101 are arranged close to the sewage treatment system to ensure that the exhaust steam condensate in the drainage main pipe 1 can smoothly enter the recovery unit when the drainage valves 101 are closed.

[0021] Example 2

[0022] The recovery unit includes a recovery pipe 3, one end of which is connected to the drainage main pipe 1, a drainage valve 101 is arranged between the connection point between the recovery pipe 3 and the drainage main pipe 1 and the sewage treatment system, the end of the recovery pipe 3 away from the drainage main pipe 1 is connected to the collection system, and the pipe body of the recovery pipe 3 is connected with a recovery valve 301, which is arranged close to the drainage main pipe 1. The drainage valve 101 is arranged between the connection point between the recovery pipe 3 and the drainage main pipe 1 and the sewage treatment system to ensure that after the drainage valve 101 is closed, the exhaust gas condensate can smoothly flow out of the drainage main pipe 1 and flow into the collection system through the recovery pipe 3, and the recovery valve 301 can control whether the exhaust gas condensate passes.

[0023] The collection system includes a water tank 4, which is arranged below the connection point between the recovery pipe 3 and the drainage main pipe 1. The water tank 4 is connected to the recovery pipe 3, and the bottom of the water tank 4 is connected to the liquid return limiting unit. The inner bottom surface of the water tank 4 is also connected to a liquid level switch 5, which is arranged at the connection point between the liquid return limiting unit and the water tank 4. The water tank 4 is a normal pressure water tank, and there is a height difference between its installation position and the connection point between the recovery pipe 3 and the drainage main pipe 1 to ensure that the exhaust steam condensate can enter smoothly. The liquid level switch 5 is a float type liquid level switch. When the liquid level of the water tank 4 submerges the liquid level switch 5, the liquid level switch 5 is opened, and the condensate in the water tank 4 enters the rehydration device 2 through the liquid return limiting unit under the action of pressure. When the liquid level in the water tank 4 is lower than the liquid level switch 5, the liquid level switch 5 is in a closed state to prevent air from entering the rehydration device 2 to destroy its vacuum degree.

[0024] Example 3

[0025] The liquid return limiting unit includes a liquid return pipe 6, which is connected to the bottom of the water tank 4. The liquid level switch 5 is arranged at the connection point between the liquid return pipe 6 and the water tank 4. The end of the liquid return pipe 6 away from the water tank 4 is connected to a U-shaped pipe 7. The height of the U-shaped pipe 7 is consistent with the height of the rehydrator 2. The end of the U-shaped pipe 7 away from the liquid return pipe 6 is connected to the rehydrator 2 through a delivery pipe 8. The condensate in the water tank 4 flows into the rehydrator 2 through the liquid return pipe 6, the U-shaped pipe 7 and the delivery pipe 8 to complete the recovery of the exhausted steam condensate. The U-shaped pipe 7 is at the same height as the rehydrator 2. When the condensing steam turbine is shut down, it is ensured that the condensate in the rehydrator 2 does not flow back into the water tank 4.

[0026] Example 4

[0027] The body of the liquid return pipe 6 is connected to a liquid return valve 601, which is arranged near the water tank 4, and the body of the delivery pipe 8 is connected to a delivery valve 801, which is arranged near the rehydration device 2. The arrangement of the liquid return valve 601 and the delivery valve 801 controls whether the condensate enters the rehydration device 2.

[0028] One side wall of the water tank 4 is connected to an overflow pipe 9 and a drip pipe 10, respectively. The overflow pipe 9 is arranged near the top of the water tank 4, and the drip pipe 10 is arranged near the bottom of the water tank 4. The body of the drip pipe 10 is connected to a drip valve 1001. When the liquid level in the water tank 4 is too high, it can flow out from the overflow pipe 9. When the steam turbine is shut down for maintenance, the drip valve 1001 can be opened to discharge the condensate in the water tank 4 from the drip pipe 10.

[0029] The working principle of the utility model steam turbine exhaust condensate recovery system is as follows:

[0030] The drain valve 101 is closed, and the exhaust condensate in the drain main pipe 1 no longer enters the sewage treatment system. Under the action of the height difference between the water tank 4 and the connection point between the recovery pipe 3 and the drain main pipe 1, the exhaust condensate enters the water tank 4 through the recovery pipe 3. The pressure difference between the water tank 4 and the rehydrator 2 is used as the power for the condensate in the water tank 4 to be transported to the rehydrator 2. When the liquid level in the water tank 4 submerges the liquid level switch 5, the liquid level switch 5 automatically opens, and the condensate in the water tank 4 flows into the rehydrator 2 through the return pipe 6, the U-shaped pipe 7 and the delivery pipe 8 under the action of pressure. When the liquid level in the water tank 4 is lower than the liquid level switch 5, the liquid level switch 5 is in a closed state to prevent air from entering the rehydrator 2 and destroying its vacuum. The U-shaped pipe 7 is at the same height as the rehydrator 2. When the condensing steam turbine is shut down, it is ensured that the condensate in the rehydrator 2 does not flow back into the water tank 4.

[0031] The utility model discloses a steam turbine exhaust condensate recovery system, which uses the pressure difference between the rehydrator and the water tank as the conveying power of the condensate in the water tank, and utilizes the height difference between the water tank and the exhaust condensate of the steam turbine to naturally flow the exhaust condensate into the water tank through the conveying pipeline, thereby effectively recovering the exhaust condensate of the steam turbine and reducing the waste of water resources. Since the exhaust condensate of the steam turbine is effectively recovered, the direct discharge of high-quality steam condensate into the sewage treatment system is avoided, which can effectively reduce the treatment cost of the sewage system and alleviate the pressure of sewage discharge of the production enterprise.

Claims

1. The steam turbine exhaust condensate recovery system is characterized by: The invention comprises two drainage main pipes (1) arranged side by side, the ends of the two drainage main pipes (1) are connected to a sewage treatment system, the pipe bodies of the two drainage main pipes (1) are connected to a recovery unit, the recovery unit is far away from the end collection system of the drainage main pipe (1), the connection point between the recovery unit and the drainage main pipe (1) is higher than the collection system, the bottom of the collection system is connected to a rehydration device (2) through a liquid return limiting unit, and the height of the liquid return limiting unit is consistent with the height of the rehydration device (2).

2. The steam turbine exhaust condensate recovery system according to claim 1, characterized in that: The pipe bodies of the two drainage main pipes (1) are both connected to drainage valves (101), and the drainage valves (101) are arranged between the connection point between the recovery unit and the drainage main pipe (1) and the sewage treatment system.

3. The steam turbine exhaust condensate recovery system according to claim 2, characterized in that: The recovery unit comprises a recovery pipe (3), one end of the recovery pipe (3) is connected to the drainage main pipe (1), the drainage valve (101) is arranged between the connection point between the recovery pipe (3) and the drainage main pipe (1) and the sewage treatment system, the end of the recovery pipe (3) away from the drainage main pipe (1) is connected to the collection system, the pipe body of the recovery pipe (3) is connected to the recovery valve (301), and the recovery valve (301) is arranged close to the drainage main pipe (1).

4. The steam turbine exhaust steam condensate recovery system according to claim 3, characterized in that: The collection system comprises a water tank (4), the water tank (4) being arranged below the connection point between the recovery pipe (3) and the drainage main pipe (1), the water tank (4) being connected to the recovery pipe (3), the bottom of the water tank (4) being connected to a liquid return limiting unit, the inner bottom surface of the water tank (4) being further connected to a liquid level switch (5), the liquid level switch (5) being arranged at the connection point between the liquid return limiting unit and the water tank (4).

5. The steam turbine exhaust condensate recovery system according to claim 4, characterized in that: The liquid return limiting unit comprises a liquid return pipe (6), the liquid return pipe (6) is connected to the bottom of the water tank (4), the liquid level switch (5) is arranged at the connection point between the liquid return pipe (6) and the water tank (4), the end of the liquid return pipe (6) away from the water tank (4) is connected to a U-shaped pipe (7), the height of the U-shaped pipe (7) is consistent with the height of the rehydration device (2), and the end of the U-shaped pipe (7) away from the liquid return pipe (6) is connected to the rehydration device (2) through a delivery pipe (8).

6. The steam turbine exhaust steam condensate recovery system according to claim 5, characterized in that: The body of the liquid return pipe (6) is connected to a liquid return valve (601), and the liquid return valve (601) is arranged close to the water tank (4). The body of the delivery pipe (8) is connected to a delivery valve (801), and the delivery valve (801) is arranged close to the rehydration device (2).

7. The steam turbine exhaust steam condensate recovery system according to claim 4, characterized in that: One side wall of the water tank (4) is respectively connected to an overflow pipe (9) and a shower pipe (10); the overflow pipe (9) is arranged near the top of the water tank (4); the shower pipe (10) is arranged near the bottom of the water tank (4); and the body of the shower pipe (10) is connected to a shower valve (1001).

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