Shaft seal leakage steam recovery mechanism of back pressure steam turbine

Abstract

The utility model relates to a shaft seal leakage steam recovery mechanism of a back pressure steam turbine, in particular to the technical field of steam turbines. The steam recovery device comprises a steam boiler, a recovery tank, a leaked steam recovery pipe, a steam jet pump, a heat exchange pipe, a spraying disc, a water tank, a cyclone guide plate and an exhaust port, spraying is performed through the spraying disc, cold water absorbs heat in leaked steam and is converted into warm water, the warm water falls into the bottom of the recovery tank, and heat exchange can be performed on water in the heat exchange pipe in the bottom of the recovery tank; water in the heat exchange pipe absorbs heat and then enters the steam boiler through the first water supplementing pipe to achieve water supplementing, heat in leaked steam is recycled, the effect of saving energy is achieved, leaked steam in a shaft seal system is effectively recycled, energy waste and environmental pollution are reduced, and the energy utilization rate of the whole leaked steam recycling mechanism is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to steam turbine technical field especially relates to a back pressure steam turbine's shaft seal steam leakage recovery mechanism. BACKGROUND

[0002] In the traditional back pressure steam turbine, the shaft seal system is used to prevent steam from leaking from the shaft end to maintain the sealing of the steam turbine. However, the shaft seal system will produce a certain amount of steam leakage during operation, which not only causes energy waste, but also may pollute the environment. Therefore, developing an effective shaft seal steam leakage recovery mechanism is of great significance to improve energy efficiency and reduce environmental pollution. SUMMARY

[0003] (1) Technical scheme

[0004] In order to solve the above technical problems, the utility model provides a back pressure steam turbine's shaft seal steam leakage recovery mechanism, including steam boiler, recovery tank, steam leakage recovery pipe, steam jet pump, heat exchange pipe, spray tray, water tank, cyclone guide plate, exhaust port, one side wall of recovery tank is equipped with steam leakage recovery port, steam leakage recovery port is connected with steam leakage recovery pipe, the lower part in recovery tank under steam leakage recovery port is equipped with heat exchange pipe, the inlet of heat exchange pipe is connected with water inlet pipe, the outlet of heat exchange pipe is connected with one end of first water supply pipe, the other end of first water supply pipe is connected with steam boiler, the inner wall on top of recovery tank is equipped with spray tray, the bottom of spray tray is equipped with a plurality of spray heads, one side of spray tray is connected with one end of water pump, the other end of water pump extends to water tank, both side walls of recovery tank between steam leakage recovery port and spray tray are equipped with cyclone guide plate, the top of recovery tank is equipped with exhaust port, the exhaust pipe is connected on exhaust port, one side of exhaust pipe is connected with steam leakage recovery pipe through back gas pipe, one side of recovery tank bottom is equipped with drain, drain is connected with spray tray through backwater pipe, the bottom of backwater pipe is connected with steam boiler through second water supply pipe, recovery tank is equipped with liquid level meter.

[0005] Preferably, the steam leakage recovery pipe is provided with a steam jet pump and a first control valve.

[0006] Preferably, the heat exchange pipe is a U-shaped coil pipe.

[0007] Preferably, the water inlet pipe is provided with a first water pump, and the first water supply pipe is provided with a second control valve.

[0008] Preferably, the water pump is provided with a third control valve and a second water pump.

[0009] Preferably, the exhaust pipe is provided with a fourth control valve, and the air return pipe is provided with an induced draft fan and a fifth control valve.

[0010] Preferably, the water return pipe is provided with a third water pump and a sixth control valve, and the second water supplement pipe is provided with a seventh control valve.

[0011] (2) beneficial effects

[0012] The back pressure type steam turbine shaft seal steam recovery mechanism has the following beneficial effects compared with the prior art.

[0013] 1. The spray disc sprays to convert the heat in the steam into warm water falling into the bottom of the recovery tank, the water in the heat exchange pipe at the bottom of the recovery tank is heat exchanged, the water in the heat exchange pipe absorbs heat and enters the steam boiler through the first water supplement pipe to supply water, the heat in the steam is recovered, and the energy is saved.

[0014] 2. A part of the steam that cannot be exchanged returns to the steam recovery pipe under the action of the induced draft fan and reenters the recovery tank to recover heat again, the steam in the shaft seal system is effectively recovered, and energy waste and environmental pollution are reduced.

[0015] 3. After heat exchange, the water at the bottom of the recovery tank can be pumped into the spray disc by the third water pump to realize water resource recycling, or the seventh control valve is opened, a part of the water is discharged to the steam boiler through the second water supplement pipe to supply water, and the energy utilization rate of the entire steam recovery mechanism is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 The utility model discloses a structure schematic view.

[0017] The figure mark is: 1-steam boiler, 2-recovery tank, 3-steam recovery port, 4-steam recovery pipe, 5-steam jet pump, 6-first control valve, 7-heat exchange pipe, 8-water inlet pipe, 9-first water pump, 10-first water supplement pipe, 11-second control valve, 12-spray disc, 121-sprayer, 13-pumping pipe, 14-third control valve, 15-second water pump, 16-water tank, 17-cyclone guide plate, 18-exhaust port, 19-exhaust pipe, 20-fourth control valve, 21-air return pipe, 22-induced draft fan, 23-fifth control valve, 24-drainage port, 25-water return pipe, 26-third water pump, 27-sixth control valve, 28-liquid level meter, 29-second water supplement pipe, 30-seventh control valve. DETAILED DESCRIPTION

[0018] The utility model makes further explanation in combination with the drawings and examples.

[0019] AsFigure 1 The utility model discloses a back pressure steam turbine's shaft seal steam leakage recovery mechanism, including steam boiler 1, recovery tank 2, steam leakage recovery pipe 4, steam injection pump 5, heat exchange pipe 7, spray tray 12, water tank 16, cyclone guide plate 17, exhaust port 18, one side wall of recovery tank 2 is equipped with steam leakage recovery port 3, steam leakage recovery port 3 is connected with steam leakage recovery pipe 4, the lower part in recovery tank 2 below steam leakage recovery port 3 is equipped with heat exchange pipe 7, the inlet of heat exchange pipe 7 is connected with water inlet pipe 8, the outlet of heat exchange pipe 7 is connected with first water supply pipe 10 one end, and first water supply pipe 10 other end is connected with steam boiler 1, and the inner wall on recovery tank 2 top is equipped with spray tray 12, and the bottom of spray tray 12 is equipped with a plurality of spray heads 121, and one side of spray tray 12 is connected with water suction pipe 13 one end, and water suction pipe 13 other end extends to water tank 16, and both side walls of recovery tank 2 between steam leakage recovery port 3 and spray tray 12 are equipped with cyclone guide plate 17, and cyclone guide plate 17 makes steam leakage form the cyclone of ascending, and the water of spray tray 12 is contacted fully, and heat exchange effect is good. Recovery tank 2 top is equipped with exhaust port 18, and exhaust port 18 is connected with exhaust pipe 19, and one side of exhaust pipe 19 is connected with steam leakage recovery pipe 4 through back air pipe 21, and one side of recovery tank 2 bottom is equipped with drain 24, and drain 24 is connected with spray tray 12 through back water pipe 25, and back water pipe 25 bottom is connected with steam boiler 1 through second water supply pipe 29, and recovery tank 2 is equipped with liquid level meter 28.

[0020] Steam injection pump 5 and first control valve 6 are equipped on steam leakage recovery pipe 4, and heat exchange pipe 7 is U-shaped coil pipe, and the heat exchange area is increased, and heat exchange effect is good.

[0021] First water pump 9 is equipped on water inlet pipe 8, second control valve 11 is equipped on first water supply pipe 10, third control valve 14 and second water pump 15 are equipped on water suction pipe 13.

[0022] Fourth control valve 20 is equipped on exhaust pipe 19, and induced draft fan 22 and fifth control valve 23 are equipped on back air pipe 21.

[0023] Third water pump 26 and sixth control valve 27 are equipped on back water pipe 25, and seventh control valve 30 is equipped on second water supply pipe 29.

[0024] In actual work process, the steam leaks under the action of steam ejector pump 5 through the steam recovery pipe 4 and from the steam recovery port 3 into the recovery tank 2 inside, open the third control valve 14 and the second water pump 15 to send the cold water in the water tank into the spray tray 12 for spraying, convert the heat in the steam into warm water into the recovery tank 1 bottom, can heat exchange the water in the heat exchange pipe 7 in the recovery tank 1 bottom (the water in the heat exchange pipe 7 is pumped into the water tank 16 or external cold water by the first water pump 9), the water in the heat exchange pipe 7 absorbs heat and enters the steam boiler 1 through the first water supply pipe 10 to realize water supply, realize the recovery of heat in the steam, play the role of energy saving, a part of the steam that does not exchange in time under the action of the induced draft fan 22 returns to the steam recovery pipe 4 and reenters the recovery tank 2 to recycle heat. After several cycles, open the fourth control valve 20, realize exhaust through the exhaust pipe 19. After heat exchange, the water at the bottom of the recovery tank 1 can be pumped into the spray tray 12 by the third water pump 26 to realize the reuse of water resources; the recovery tank 2 is also provided with a liquid level gauge, the specific position of the water at the bottom of the recovery tank 2 can be known, when the water level exceeds the steam recovery port 3, the seventh control valve 30 can be opened, a part of the water is discharged into the steam boiler 1 through the second water supply pipe 29 for supply. The contents not described in detail in the specification belong to the prior art known to those skilled in the art.

[0025] The above-described embodiments only express the preferred embodiments of the present application, and the description is more specific and detailed, but the present application is not limited to these embodiments. It should be noted that for those skilled in the art. Any improvement made without departing from the spirit of the present application falls within the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A shaft seal steam leakage recovery mechanism of a back pressure steam turbine, characterized by, The utility model provides a steam recovery device, including steam boiler (1), recovery tank (2), steam recovery pipe (4), steam jet pump (5), heat exchange pipe (7), spray tray (12), water tank (16), cyclone guide plate (17), exhaust port (18), one side wall of recovery tank (2) is equipped with steam recovery port (3), steam recovery port (3) is connected with steam recovery pipe (4), the lower part of recovery tank (2) under steam recovery port (3) is equipped with heat exchange pipe (7), the inlet of heat exchange pipe (7) is connected with water inlet pipe (8) intercommunication, the outlet of heat exchange pipe (7) is connected with first water supply pipe (10) one end, first water supply pipe (10) other end is connected with steam boiler (1), the inner wall on the top of recovery tank (2) is equipped with spray tray (12), the bottom of spray tray (12) is equipped with a plurality of spray head (121), one side of spray tray (12) is connected with water suction pipe (13) one end, water suction pipe (13) other end extends into water tank (16), both side walls of recovery tank (2) between steam recovery port (3) and spray tray (12) are equipped with cyclone guide plate (17), the top of recovery tank (2) is equipped with exhaust port (18), exhaust port (18) is connected with exhaust pipe (19), one side of exhaust pipe (19) is connected with steam recovery pipe (4) through back air pipe (21), one side of the bottom of recovery tank (2) is equipped with drain (24), drain (24) is connected with spray tray (12) through back water pipe (25), back water pipe (25) bottom is connected with steam boiler (1) through second water supply pipe (29), recovery tank (2) is equipped with liquid level gauge (28).

2. A back pressure turbine shaft seal leakage recovery mechanism as claimed in claim 1 wherein, Steam recovery pipe (4) is equipped with steam jet pump (5) and first control valve (6).

3. A shaft seal steam leakage recovery mechanism for a back pressure steam turbine according to claim 1, characterized by Heat exchange pipe (7) is U-shaped coil pipe.

4. A back pressure turbine shaft seal leakage recovery mechanism as claimed in claim 1 wherein, Water inlet pipe (8) is equipped with first water pump (9), and first water supply pipe (10) is equipped with second control valve (11).

5. A back pressure turbine shaft seal leakage recovery mechanism as claimed in claim 1 wherein, Water suction pipe (13) is equipped with third control valve (14) and second water pump (15).

6. A back pressure turbine shaft seal leakage recovery mechanism as claimed in claim 1 wherein, Exhaust pipe (19) is equipped with fourth control valve (20), and back air pipe (21) is equipped with induced draft fan (22) and fifth control valve (23).

7. A back pressure turbine shaft seal leakage recovery mechanism as claimed in claim 1 wherein, Back water pipe (25) is equipped with third water pump (26) and sixth control valve (27), and second water supply pipe (29) is equipped with seventh control valve (30).

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