Closed recovery system for shaft seal steam condensate of air separation turbine

Abstract

The utility model relates to the technical field of condensate recovery, and particularly discloses a closed recovery system for shaft seal steam condensate of an air separation turbine. Comprising a first device steam turbine high-pressure shaft sealing steam guide shower, a second device steam turbine high-pressure shaft sealing steam guide shower, a first device steam turbine medium-pressure shaft sealing steam vapor-liquid separator guide shower pipeline, a second device steam turbine medium-pressure shaft sealing steam vapor-liquid separator guide shower pipeline, a sewage well and a backup system liquid nitrogen water area vaporizer. Alloy pipelines I are mounted at the bottom ends of the steam turbine high-pressure shaft sealing steam guide shower of the first device and the steam turbine high-pressure shaft sealing steam guide shower of the second device, one end of each alloy pipeline I leads to a sewage well, and carbon steel pipes I are mounted at the top ends of the steam turbine high-pressure shaft sealing steam guide shower of the first device and the steam turbine high-pressure shaft sealing steam guide shower of the second device; waste heat is used for exchanging heat with liquid nitrogen, and condensate can be conveyed to a circulating water reservoir by the existing device to serve as production replenishing water, so that the water consumption for production is saved, and the quality of circulating water is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of condensate recovery, and in particular relates to a closed recovery system for shaft seal steam condensate of an air separation steam turbine. Background Art

[0002] In order to meet the temperature and superheat operating conditions of high and medium pressure shaft seal steam, the air separation unit must open the large drain for a long period of time to discharge condensate to raise the steam temperature. The large amount of high and medium pressure shaft seal steam drain causes the drainage to splash everywhere on site, and the steam in the sewage well is seriously bubbling. The large amount of condensate produced increases the pressure of the sewage drainage system of the unit, which in turn causes the waste of condensate, so the condensate needs to be recovered.

[0003] However, the existing air separation turbine shaft seals have some shortcomings: a large amount of high- and medium-pressure shaft seal steam leakage causes the drainage to splash everywhere on site, steam from the sewage well is serious, and there is leakage on site.

[0004] To this end, those skilled in the art have proposed a closed recovery system for shaft seal steam condensate of an air separation steam turbine to solve the above-mentioned problems. Utility Model Content

[0005] The utility model aims to provide a closed recovery system for shaft seal steam condensate of an air separation steam turbine, so as to solve the problems raised in the above-mentioned background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A closed recovery system for shaft seal steam condensate of an air separation steam turbine, comprising:

[0008] The high-pressure shaft seal steam drain of the 1# unit turbine, the high-pressure shaft seal steam drain of the 2# unit turbine, the drain pipe of the medium-pressure shaft seal steam vapor-liquid separator of the 1# unit turbine, the drain pipe of the medium-pressure shaft seal steam vapor-liquid separator of the 2# unit turbine, the sewage well and the liquid nitrogen water vaporizer of the backup system. The bottom ends of the high-pressure shaft seal steam drain of the 1# unit turbine and the high-pressure shaft seal steam drain of the 2# unit turbine are both installed with an alloy pipe one, one end of which leads to the sewage well, and the top ends of the high-pressure shaft seal steam drain of the 1# unit turbine and the high-pressure shaft seal steam drain of the 2# unit turbine are both installed with a carbon steel pipe one, one end of which leads to the liquid nitrogen water vaporizer of the backup system.

[0009] Preferably, a drain valve 1 is installed at one end of the high-pressure shaft seal steam drain of the 1# unit turbine near the alloy pipe 1.

[0010] Preferably, a drain valve 2 is installed at one end of the high-pressure shaft seal steam drain of the 2# unit turbine near the alloy pipe 1.

[0011] Preferably, pipe gallery bridge columns are installed on both sides of the outer wall of the bottom of the carbon steel pipe.

[0012] Preferably, the bottom ends of the medium-pressure steam shaft seal steam vapor-liquid separator drain pipe of the 1# unit turbine and the medium-pressure steam shaft seal steam vapor-liquid separator drain pipe of the 2# unit turbine are respectively installed with medium-pressure steam U-shaped bend drain pipe one and medium-pressure steam U-shaped bend drain pipe two, and one end of the medium-pressure steam U-shaped bend drain pipe one and medium-pressure steam U-shaped bend drain pipe two are both installed with alloy pipe two, and one end of the alloy pipe two leads to the sewage well.

[0013] Preferably, a guide valve three is installed at a position of the guide pipe one near the medium-pressure steam U-bend of the alloy pipe two, and a guide valve four is installed at a position of the guide pipe two near the medium-pressure steam U-bend of the alloy pipe two.

[0014] Preferably, the top of the medium-pressure shaft seal steam vapor-liquid separator drain pipe of the 1# unit steam turbine and the top of the medium-pressure shaft seal steam vapor-liquid separator drain pipe of the 2# unit steam turbine are both installed with a carbon steel pipe 2, one end of the carbon steel pipe 2 is installed with a three-way valve 2, one end of the three-way valve 2 is installed with a connecting pipe 2, and one end of the connecting pipe 2 leads to the interior of the liquid nitrogen water vaporizer of the backup system.

[0015] Preferably, a three-way valve is installed at one end of the carbon steel pipe, a connecting pipe is installed at one end of the three-way valve, and one end of the connecting pipe leads to the interior of the liquid nitrogen water vaporizer of the backup system.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] (1) The utility model is provided with alloy pipe 1 and alloy pipe 2, and the high-pressure shaft seal steam guide of the steam turbine of the 1# device, the high-pressure shaft seal steam guide of the steam turbine of the 2# device, the guide pipe of the steam vapor-liquid separator of the medium-pressure shaft seal of the steam turbine of the 1# device and the guide pipe of the steam vapor-liquid separator of the medium-pressure shaft seal of the steam turbine of the 2# device are led to the interior of the sewage well through the alloy pipe 1 and alloy pipe 2, so as to avoid the on-site drainage from splashing everywhere, and the high-pressure shaft seal steam guide of the steam turbine of the 1# device, the high-pressure shaft seal steam guide of the steam turbine of the 2# device, the guide pipe of the steam vapor-liquid separator of the medium-pressure shaft seal of the steam turbine of the 1# device and the guide pipe of the steam vapor-liquid separator of the medium-pressure shaft seal of the steam turbine of the 2# device are led to the liquid nitrogen water vaporizer of the backup system through the carbon steel pipe 1 and carbon steel pipe 2, and the waste heat is used for heat exchange with liquid nitrogen, and the condensate can be sent to the circulating water reservoir as production make-up water by the existing device, thereby saving the production water consumption and improving the water quality of the circulating water. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] In the figure: 1. Steam drain for high-pressure shaft seal of steam turbine of unit 1#; 2. Steam drain for high-pressure shaft seal of steam turbine of unit 2#; 3. Pipe gallery bridge column; 4. Drain valve 1; 5. Alloy pipe 1; 6. Drain valve 2; 7. Alloy pipe 2; 8. Sewage well; 9. Drain valve 3; 10. Drain pipe 1 at medium-pressure steam U-bend; 11. Drain valve 4; 12. Drain pipe 2 at medium-pressure steam U-bend; 13. Drain pipe for medium-pressure shaft seal steam vapor-liquid separator of steam turbine of unit 1#; 14. Drain pipe for medium-pressure shaft seal steam vapor-liquid separator of steam turbine of unit 2#; 15. Carbon steel pipe 1; 16. Carbon steel pipe 2; 17. Three-way valve 1; 18. Three-way valve 2; 19. Connecting pipe 1; 20. Connecting pipe 2; 21. Liquid nitrogen water vaporizer of backup system. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1 As shown, a closed recovery system for shaft seal steam condensate of an air separation steam turbine comprises:

[0022] 1# unit steam turbine high-pressure shaft seal steam drain 1, 2# unit steam turbine high-pressure shaft seal steam drain 2, 1# unit steam turbine medium-pressure shaft seal steam vapor-liquid separator drain pipe 13, 2# unit steam turbine medium-pressure shaft seal steam vapor-liquid separator drain pipe 14, sewage well 8 and backup system liquid nitrogen water vaporizer 21, the bottom ends of 1# unit steam turbine high-pressure shaft seal steam drain 1 and 2# unit steam turbine high-pressure shaft seal steam drain 2 are both installed with alloy pipe 15, one end of the alloy pipe 15 leads to the sewage well 8, the top ends of 1# unit steam turbine high-pressure shaft seal steam drain 1 and 2# unit steam turbine high-pressure shaft seal steam drain 2 are both installed with carbon steel pipe 15, one end of the carbon steel pipe 15 leads to the backup system liquid nitrogen water vaporizer 21.

[0023] As can be seen from the above, the high-pressure steam seal drain 1 of the steam turbine of the 1# device and the high-pressure steam seal drain 2 of the steam turbine of the 2# device are connected to the sewage well 8 through the alloy pipe 15, and the other end thereof is connected to the liquid nitrogen water vaporizer 21 of the backup system through the carbon steel pipe 15, so as to avoid the on-site drainage from splashing everywhere and recover the condensate, thereby achieving the effect of saving water.

[0024] Specifically, a drain valve 4 is installed at one end of the high-pressure shaft seal steam drain 1 of the 1# unit turbine near the alloy pipe 5.

[0025] From the above, it can be seen that the delivery of the high-pressure shaft seal steam guide valve 1 of the 1# unit turbine is controlled by the guide valve 4.

[0026] Specifically, a drain valve 2 6 is installed at one end of the high-pressure shaft seal steam drain 2 of the 2# unit turbine near the alloy pipe 1 5 .

[0027] From the above, it can be seen that the delivery of the high-pressure shaft seal steam guide valve 2 of the 2# unit turbine is controlled by the guide valve 6.

[0028] Specifically, pipe gallery bridge columns 3 are installed on both sides of the bottom outer wall of the carbon steel pipe 15.

[0029] From the above, it can be seen that the carbon steel pipe 15 is supported by the pipe gallery bridge column 3.

[0030] Specifically, the bottom ends of the medium-pressure steam shaft seal steam vapor-liquid separator drain pipe 13 of the 1# unit turbine and the medium-pressure steam shaft seal steam vapor-liquid separator drain pipe 14 of the 2# unit turbine are respectively installed with medium-pressure steam U-shaped bend drain pipe one 10 and medium-pressure steam U-shaped bend drain pipe two 12, and one end of the medium-pressure steam U-shaped bend drain pipe one 10 and the medium-pressure steam U-shaped bend drain pipe two 12 are both installed with alloy pipe two 7, and one end of alloy pipe two 7 leads to the sewage well 8.

[0031] As can be seen from the above, the steam vapor-liquid separator drain pipe 13 of the medium-pressure shaft seal steam of the 1# unit steam turbine and the steam vapor-liquid separator drain pipe 14 of the medium-pressure shaft seal steam of the 2# unit steam turbine are connected to the sewage well 8 through the alloy pipe 7.

[0032] Specifically, a guide valve three 9 is installed at a position of a guide pipe one 10 near the medium-pressure steam U-bend of the alloy pipe two 7, and a guide valve four 11 is installed at a position of a guide pipe two 12 near the medium-pressure steam U-bend of the alloy pipe two 7.

[0033] As can be seen from the above, the delivery of liquid inside the dripping pipe 13 of the medium-pressure shaft seal steam vapor-liquid separator of the 1# unit steam turbine and the dripping pipe 14 of the medium-pressure shaft seal steam vapor-liquid separator of the 2# unit steam turbine is controlled respectively by the dripping valve three 9 and the dripping valve four 11.

[0034] Specifically, the tops of the medium-pressure shaft seal steam vapor-liquid separator drain pipe 13 of the 1# unit steam turbine and the medium-pressure shaft seal steam vapor-liquid separator drain pipe 14 of the 2# unit steam turbine are both installed with a carbon steel pipe 16, one end of the carbon steel pipe 16 is installed with a three-way valve 18, one end of the three-way valve 18 is installed with a connecting pipe 20, one end of the connecting pipe 20 leads to the interior of the liquid nitrogen water vaporizer 21 of the backup system.

[0035] As can be seen from the above, the steam vapor-liquid separator drain pipe 14 of the medium-pressure shaft seal steam of the 2# unit steam turbine is led to the liquid nitrogen water vaporizer 21 of the backup system, and the waste heat is used for heat exchange with liquid nitrogen.

[0036] Specifically, a three-way valve 17 is installed at one end of the carbon steel pipe 15, a connecting pipe 19 is installed at one end of the three-way valve 17, and one end of the connecting pipe 19 leads to the interior of the liquid nitrogen water vaporizer 21 of the backup system.

[0037] As can be seen from the above, the steam vapor-liquid separator drain pipe 13 of the medium-pressure shaft seal steam of the 1# unit steam turbine is led to the liquid nitrogen water vaporizer 21 of the backup system, and the waste heat is used for heat exchange with liquid nitrogen.

[0038] Working principle: The high-pressure shaft seal steam guide shower 1 of the 1# unit steam turbine and the high-pressure shaft seal steam guide shower 2 of the 2# unit steam turbine as well as the medium-pressure shaft seal steam vapor-liquid separator guide shower pipe 13 of the 1# unit steam turbine and the medium-pressure shaft seal steam vapor-liquid separator guide shower pipe 14 of the 2# unit steam turbine are led to the sewage well 8 through alloy pipe 1 5 and alloy pipe 2 7 to avoid the on-site drainage from splashing everywhere, and the high-pressure shaft seal steam guide shower 1 of the 1# unit steam turbine and the high-pressure shaft seal steam guide shower 2 of the 2# unit steam turbine as well as the medium-pressure shaft seal steam vapor-liquid separator guide shower pipe 13 of the 1# unit steam turbine and the medium-pressure shaft seal steam vapor-liquid separator guide shower pipe 14 of the 2# unit steam turbine are led to the liquid nitrogen water vaporizer 21 of the backup system through carbon steel pipe 1 15 and carbon steel pipe 2 16 to exchange heat with liquid nitrogen using waste heat.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A closed recovery system for air separation steam turbine shaft seal steam condensate, characterized in that: The invention comprises a steam guide shower (1) for a high-pressure shaft seal of a steam turbine of a No. 1 device, a steam guide shower (2) for a high-pressure shaft seal of a steam turbine of a No. 2 device, a guide shower pipe (13) for a steam gas-liquid separator for a medium-pressure shaft seal of a steam turbine of a No. 1 device, a guide shower pipe (14) for a steam gas-liquid separator for a medium-pressure shaft seal of a steam turbine of a No. 2 device, a sewage well (8) and a liquid nitrogen water vaporizer (21) for a backup system. The bottom ends of the steam guide shower (1) for the high-pressure shaft seal of the steam turbine of the No. 1 device and the steam guide shower (2) for the high-pressure shaft seal of the steam turbine of the No. 2 device are both provided with an alloy pipe (5), one end of which leads to the sewage well (8), and the top ends of the steam guide shower (1) for the high-pressure shaft seal of the steam turbine of the No. 1 device and the steam guide shower (2) for the high-pressure shaft seal of the steam turbine of the No. 2 device are both provided with a carbon steel pipe (15), one end of which leads to the liquid nitrogen water vaporizer (21) for the backup system.

2. The closed recovery system for shaft seal steam condensate of air separation steam turbine according to claim 1, characterized in that: A drain valve (4) is installed at one end of the high-pressure shaft seal steam drain (1) of the steam turbine of the No. 1 device, near a position of an alloy pipe (5).

3. The closed recovery system for shaft seal steam condensate of air separation steam turbine according to claim 1, characterized in that: A drain valve 2 (6) is installed at one end of the high-pressure shaft seal steam drain (2) of the steam turbine of the No. 2 device, near the position of the alloy pipe 1 (5).

4. The closed recovery system for shaft seal steam condensate of air separation steam turbine according to claim 1, characterized in that: Pipe gallery bridge columns (3) are installed on both sides of the outer wall of the bottom of the carbon steel pipe (15).

5. The closed recovery system for shaft seal steam condensate of air separation steam turbine according to claim 1, characterized in that: The bottom ends of the medium-pressure shaft seal steam vapor-liquid separator drain pipe (13) of the 1# unit steam turbine and the medium-pressure shaft seal steam vapor-liquid separator drain pipe (14) of the 2# unit steam turbine are respectively installed with medium-pressure steam U-shaped bend drain pipe one (10) and medium-pressure steam U-shaped bend drain pipe two (12), and one end of the medium-pressure steam U-shaped bend drain pipe one (10) and medium-pressure steam U-shaped bend drain pipe two (12) are both installed with alloy pipe two (7), and one end of the alloy pipe two (7) leads to a sewage well (8).

6. The closed recovery system for shaft seal steam condensate of air separation steam turbine according to claim 5, characterized in that: The alloy pipe 2 (7) is provided with a drain valve 3 (9) at a position close to the drain pipe 1 (10) at the medium-pressure steam U-bend, and the alloy pipe 2 (7) is provided with a drain valve 4 (11) at a position close to the drain pipe 2 (12) at the medium-pressure steam U-bend.

7. The closed recovery system for shaft seal steam condensate of air separation steam turbine according to claim 1, characterized in that: The top ends of the steam gas-liquid separator drain pipe (13) of the steam turbine medium-pressure shaft seal of the No. 1 device and the steam gas-liquid separator drain pipe (14) of the steam turbine medium-pressure shaft seal of the No. 2 device are both installed with a second carbon steel pipe (16), one end of the second carbon steel pipe (16) is installed with a second three-way valve (18), one end of the second three-way valve (18) is installed with a second connecting pipe (20), one end of the second connecting pipe (20) leads to the interior of the liquid nitrogen water vaporizer (21) of the backup system.

8. The closed recovery system for shaft seal steam condensate of air separation steam turbine according to claim 1, characterized in that: A three-way valve (17) is installed at one end of the carbon steel pipe (15), a connecting pipe (19) is installed at one end of the three-way valve (17), and one end of the connecting pipe (19) leads to the interior of the liquid nitrogen water vaporizer (21) of the backup system.

Images