JP2011214501A - Gland steam condenser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gland steam condenser capable of preventing trip and damage of a fan for exhaustion by drain and the like staying in an exhaust pipe and capable of conducting a stable continuous operation.SOLUTION: In the gland steam condenser 6, an exhaust part 8 for discharging exhaust gas in a gland steam condensing part 7 includes a condensing part side line La communicating with the gland steam condensing part 7, a first exhaust line Lb and a second exhaust line Lc branched from an end part of a downstream side of the condensing part side line La, a first exhaust fan 9b arranged for the first exhaust line Lb, a second exhaust fan 9c arranged for the second exhaust line Lc, a first check valve 10b arranged at a downstream side from the first exhaust fan 9b in a first exhaust line LAb, a second check valve 10c arranged at a downstream side from the second exhaust fan 9c in the second exhaust line Lc and a communicating line Ld for communicating the downstream side from the first exhaust fan 9b of the first exhaust line Lb and the downstream side from the second exhaust fan 9c of the second exhaust line Lc.

Description

  The present invention relates to a ground steam condensing device provided in a steam power plant using a steam turbine.

  Conventionally, a grand steam condensing device is provided in a steam power plant using a steam turbine (see, for example, Patent Document 1). A ground steam condensing device is a device that collects and drains ground steam for sealing a ground portion through which a rotating shaft of a turbine rotated by steam passes through a turbine casing.

JP-A-8-200013

In the grand steam condensing device, the exhaust line from the grand steam condenser that drains the ground steam branches into two exhaust lines each having an exhaust fan, and is connected to the downstream end of each exhaust line. There exists a form which joins in the provided joining part and discharges exhaust_gas | exhaustion from one exhaust port.
With this configuration, one exhaust line can be used as a normal exhaust line and the other exhaust line can be used as a standby exhaust line. When the operation is stopped, the fan on the exhaust line on the standby side can be activated to perform exhaust. Further, with such a configuration, sufficient exhaust can be performed by using both exhaust lines when exhaust cannot be sufficiently performed only by the fans in the normal exhaust line.

  However, in the above-mentioned grand steam condensing device, rainwater that has entered from the exhaust port, drain that is generated by the moisture contained in the exhaust gas discharged from the exhaust line on the normal side being cooled by outside air, etc. It tends to accumulate in the exhaust pipe on the exhaust port side from the check valve on the exhaust line on the standby side that is not movable. If the standby exhaust line fan is started without discharging the accumulated drain, etc., the check valve opens and the accumulated drain flows into the standby fan casing. However, this fan has a problem that a trip due to overload occurs and the fan stops or is damaged.

  When such a trip due to the inflow of drain occurs, there is a problem that the drain must be discharged from the casing of the fan and restarted each time. In particular, when the fan on the normal side stops due to some trouble and the fan on the standby side does not start due to the trip as described above, the recovery of the ground steam by the ground steam condensing device stops, and the emergency drain discharge Therefore, there was a problem that the operation of the power plant was hindered.

  An object of the present invention is to provide a gland steam condensing device that can significantly reduce the trip and damage of an exhaust fan due to drain or the like accumulated in an exhaust pipe and can perform stable continuous operation.

The present invention solves the above problems by the following means.
The invention according to claim 1 is a ground steam condensing device that collects and drains the ground steam used for sealing the ground part of the steam turbine, and condenses the ground steam and drains it. And an exhaust part for exhausting exhaust gas inside the grand steam condensate part from an exhaust port communicating with the grand steam condensate part, wherein the exhaust part communicates with the ground steam condensate part. A part side line, a first exhaust line and a second exhaust line branching from the downstream end of the condensate part side line, a first exhaust fan provided in the first exhaust line, and the second exhaust line A second exhaust fan provided on the exhaust port, an exhaust merge line extending from the exhaust merge portion where the downstream end of the first exhaust line and the downstream end of the second exhaust line merge to the exhaust outlet side The first A first check valve provided on the downstream side of the first exhaust fan in the air line to prevent the backflow of exhaust gas to the ground steam condensing part side; and the second exhaust fan in the second exhaust line Is also provided on the downstream side, and a second check valve for preventing the backflow of exhaust gas to the ground steam condensing part side, and the downstream side of the first exhaust fan in the first exhaust line and the second exhaust line A ground steam condensing device comprising: a communication line communicating with the downstream side of the second exhaust fan.

  The invention according to claim 2 is the gland steam condensing device according to claim 1, wherein the communication line is provided with a communication line regulating valve capable of adjusting the flow rate of the exhaust gas.

  The invention according to claim 3 is characterized in that the communication line is provided with a check valve for a communication line that prevents inflow of exhaust gas from the second exhaust line side to the first exhaust line side. The ground steam condensing device according to Item 1.

  The invention according to claim 4 is characterized in that the exhaust pipe having the exhaust port is curved so that the exhaust port opens downward. It is a grand steam condensing device described in 1.

  According to the present invention, it is possible to prevent drainage, rainwater, and the like from accumulating in the exhaust pipe downstream of the check valve provided in the standby side exhaust line as much as possible. The ground steam condensing device can be operated stably. Thereby, according to this invention, the stable driving | operation of a power plant can be performed.

It is a systematic diagram of ground steam of an embodiment. It is a figure showing a grand steam condensing device of an embodiment. It is a figure which shows the flow of the exhaust_gas | exhaustion in the grand steam condensing apparatus of embodiment. It is a figure which shows the grand steam condensing apparatus of a comparative example. It is a figure which shows the grand steam condensing apparatus of a deformation | transformation form.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In addition, each figure shown below including FIG. 1 is the figure shown typically, and the magnitude | size and shape of each part are exaggerated suitably for easy understanding.

FIG. 1 is a system diagram of ground steam according to the present embodiment.
FIG. 2 is a diagram illustrating the ground steam condensing device of the present embodiment.
The ground steam condensing device 6 of the present embodiment is provided in a steam power plant 100 including the steam turbine 1. As shown in FIG. 1, the steam power plant 100 includes a steam turbine 1, ground portions 3 and 4, a ground steam line 5, and a ground steam condensing device 6.
The steam turbine 1 includes a rotor 2. The ground portions 3 and 4 are provided at locations where both end portions of the rotor 2 penetrate the casing of the steam turbine 1. And the gland | grand | ground parts 3 and 4 have a function which prevents the leakage of the vapor | steam from a vehicle interior side, and the inflow of the air into the steam turbine 1 from the exterior. Further, the gland portions 3 and 4 communicate with the gland steam condensing device 6 of the present embodiment via the gland steam line 5.

The grand steam condensing device 6 of this embodiment includes a ground steam condensing unit 7 and an exhaust unit 8.
The ground steam condensing device 6 collects ground steam supplied from a supply line (not shown) to seal the ground portions 3 and 4 through the ground steam line 5, and condenses and drains the ground steam. It is.
The ground steam condensing unit 7 is a part that drains the ground steam collected through the ground steam line 5.
The exhaust unit 8 communicates with the grand steam condensing unit 7 and exhausts the exhaust inside the grand steam condensing unit 7 (exhaust gas generated during draining of the ground steam) from the exhaust port 8a (see FIG. 2). It is a part to do. The exhaust unit 8 has a function of maintaining the negative pressure inside the grand steam condensing unit 7 by discharging the exhaust inside the grand steam condensing unit 7.

As shown in FIG. 2, the exhaust part 8 includes a condensate part side line La communicating with the ground steam condensate part 7 and an exhaust branch part J1 provided at the downstream end of the condensate part side line La. The first exhaust line Lb and the second exhaust line Lc that branch off, the exhaust outlet 8a from the exhaust confluence J4 where the downstream end of the first exhaust line Lb and the downstream end of the second exhaust line Lc join. An exhaust merging line Le extending to the side, and a communication line Ld for communicating the downstream side of the first exhaust line Lb and the downstream side of the second exhaust line Lc. In FIG. 2, the upper side in the drawing is shown as the upper side in the vertical direction, and the lower side in the drawing is shown as the lower side in the vertical direction, and the exhaust unit 8 of the present embodiment extends from the ground steam condensing unit 7 substantially upward in the vertical direction. Yes.
In the present specification and claims, the “line” is a general term for lines capable of flowing a fluid such as a flow path, a path, and a pipeline.

The first exhaust line Lb branches off from an exhaust branch portion J1 provided at the downstream end of the condensate portion side line La, and is connected to the second exhaust line Lc at the exhaust confluence portion J4 at the downstream end thereof. Have joined. The 1st exhaust line Lb has the connection part J2 to which the connection line Ld is connected on the way. In the first exhaust line Lb, the upstream side from the connecting portion J2 is referred to as an upstream first exhaust line Lb1, and the downstream side from the connecting portion J2 is referred to as a downstream first exhaust line Lb2.
The upstream first exhaust line Lb1 is provided with a first exhaust fan 9b, and a first check valve 10b is provided downstream of the first exhaust fan 9b. The 1st exhaust fan 9b is a fan for discharging | emitting the exhaust in the grand steam condensate part 7 from the exhaust port 8a. The first check valve 10b is a check valve that prevents a backflow of exhaust gas toward the ground steam condensing unit 7 side. The first check valve 10b is preferably provided in the vicinity of the connection portion J2.
A first regulating valve 11b is provided in the downstream first exhaust line Lb2. The first adjustment valve 11b is a valve that can be opened and closed and can adjust the flow rate of the exhaust gas.

The second exhaust line Lc branches off from an exhaust branch portion J1 provided at the downstream end of the condensate portion side line La, and is connected to the first exhaust line Lb at the exhaust confluence portion J4 at the downstream end thereof. Have joined. The second exhaust line Lc has a connection portion J3 to which the communication line Ld is connected midway. In the second exhaust line Lc, the upstream side from the connecting portion J3 is referred to as an upstream second exhaust line Lc1, and the downstream side from the connecting portion J3 is referred to as a downstream second exhaust line Lc2.
A second exhaust fan 9c is provided in the upstream second exhaust line Lc1, and a second check valve 10c is provided downstream of the second exhaust fan 9c. The 2nd exhaust fan 9c is a fan for discharging | emitting the exhaust in the grand steam condensate part 7 from the exhaust port 8a. The second check valve 10c is a check valve that prevents a backflow of exhaust gas toward the ground steam condensing unit 7 side. The second check valve 10c is preferably provided in the vicinity of the connection portion J3.
A second regulating valve 11c is provided in the downstream second exhaust line Lc2. The second adjustment valve 11c is a valve that can be opened and closed and can adjust the flow rate of the exhaust gas.

The communication line Ld is a line that is connected to the first exhaust line Lb at the connection portion J2, is connected to the second exhaust line Lc at the connection portion J3, and communicates the first exhaust line Lb and the second exhaust line Lc. The communication line Ld is provided with a communication line adjusting valve 11d. The communication line adjusting valve 11d is a valve that can be opened and closed and can adjust the flow rate of the exhaust gas flowing through the communication line Ld.
The exhaust pipe having the exhaust port 8a is provided at the end of the exhaust merging line Le, and is curved so that its opening faces downward as schematically shown in FIG.

Each exhaust fan 9b, 9c described above is controlled to start and stop by a control unit (not shown). Further, in the ground steam condensing device 6, when the operation of the exhaust fan of one exhaust line stops, the control unit is set so that the exhaust fan of the other exhaust line that has been waiting automatically starts. .
The check valves 10b and 10c and the regulating valves 11b, 11c, and 11d are controlled by the control unit so as to open and close, the flow rate of exhaust gas, and the like.

The basic operation of the exhaust unit 8 of the grand steam condensing device 6 will be described.
Drawing 3 is a figure showing the flow of exhaust in the grand steam condensing device of an embodiment. 3A shows the flow of exhaust when the normal exhaust line is in operation, and FIG. 3B shows the flow of exhaust when the standby exhaust line is in operation.
The ground steam condensing device 6 uses one exhaust line as a normal exhaust line and the other as a standby exhaust line. Here, description will be made assuming that the first exhaust line Lb is a normal exhaust line and the second exhaust line Lc is a standby exhaust line.
During normal operation of the ground steam condensing device 6, the first exhaust fan 9b on the normal side is operating, and the first check valve 10b is opened, but the second exhaust fan 9c on the standby side is open. Is stopped, and the second check valve 10c is closed. The first adjustment valve 11b, the second adjustment valve 11c, and the connection line adjustment valve 11d are opened, and the flow rate of the exhaust gas is adjusted by the control unit.
Exhaust gas discharged from the ground steam condensing unit 7 by the operation of the first exhaust fan 9b passes through the condensing unit side line La as shown by an arrow E1 in FIG. 3A, and is upstream from the exhaust branching unit J1. It is introduced into the first exhaust line Lb1. Then, the exhaust gas passes through the first check valve 10b and reaches the connection portion J2.

Next, the exhaust gas is branched at the connection portion J2, and a part thereof is introduced into the downstream first exhaust line Lb2, and the rest is introduced into the communication line Ld.
Exhaust gas that has flowed to the downstream first exhaust line Lb2 passes through the first regulating valve 11b and reaches the exhaust gas junction J4 as indicated by an arrow E2 shown in FIG.
On the other hand, the exhaust gas introduced into the communication line Ld passes through the communication line regulating valve 11d as shown by an arrow E3 in FIG. 3A, and is introduced from the connection portion J3 to the downstream second exhaust line Lc2. The exhaust merging portion J4 is reached through the second regulating valve 11c.
These exhaust gases are merged at the exhaust merge portion J4, and are discharged into the atmosphere from the exhaust port 8a through the exhaust merge line Le as indicated by an arrow E4 shown in FIG. That is, the exhaust inside the ground steam condensing unit 7 is exhausted through the communication line Ld and the downstream second exhaust line Lc2 even when the second exhaust fan 9c on the standby side is stopped. It is discharged from the mouth 8a.

Here, if any trouble occurs in the first exhaust fan 9b, the operation of the first exhaust fan 9b is stopped and the first check valve 10b is closed by an instruction from a control unit (not shown). And according to the instruction | indication of a control part, the 2nd non-return valve 10c is opened and the 2nd exhaust fan 9c starts automatically.
Then, the exhaust inside the ground steam condensate unit 7 is caused to flow upstream through the condensate unit side line La as shown by an arrow E5 in FIG. 3B by the operation of the second exhaust fan 9c. The gas is introduced into the exhaust line Lc1 and reaches the connection portion J3 through the first check valve 10b.
Then, the exhaust gas is branched at the connection portion J3, and a part thereof is introduced into the downstream second exhaust line Lc2, and the rest is introduced into the communication line Ld.

The exhaust gas introduced into the downstream second exhaust line Lc2 passes through the second regulating valve 11c and reaches the exhaust junction J4 as indicated by an arrow E6 shown in FIG.
On the other hand, the exhaust gas introduced into the communication line Ld passes through the communication line regulating valve 11d as indicated by an arrow E7 shown in FIG. 3B, and flows from the connection portion J2 to the downstream first exhaust line Lb2, and the first It passes through the regulating valve 11b and reaches the exhaust junction J4.
These exhaust gases join at the exhaust junction J4, and are discharged into the atmosphere through the exhaust junction line Le as indicated by an arrow E8 shown in FIG. 3B. That is, the exhaust gas in the ground steam condensing unit 7 is exhausted from the exhaust port 8a through the communication line Ld and the downstream first exhaust line Lb2 even when the first exhaust fan 9b is stopped. The

Here, the first exhaust line Lb has been described as a normal exhaust line and the second exhaust line Lc has been described as a standby exhaust line. However, these can be switched as appropriate, and the second exhaust line Lc can be switched to the normal side. The first exhaust line Lb can be a standby exhaust line.
In addition, when the gland steam condensing device 6 is started up or the like, if the exhaust inside the gland steam condensing unit 7 cannot be sufficiently exhausted only by operating one of the exhaust fans, both the check valve and the regulating valve are turned on. It is possible to open and operate both exhaust fans.

Here, the exhaust part 28 of the ground steam condensing device 26 of the comparative example will be described.
FIG. 4 is a diagram showing a ground steam condensing device of a comparative example.
The ground steam condensing device 26 of the comparative example includes two exhaust lines, does not include the communication line Ld and the communication line regulating valve 11d, and the connection portions J2 and J3, and the exhaust port 28a is located on the upper side in the vertical direction. Except for the point which has faced, it is a form substantially the same as the grand steam condensing apparatus 6 of this embodiment. Therefore, the same functions as those of the grand steam condensing device 6 of the present embodiment are denoted by the same reference numerals or the same reference numerals at the end, and redundant description is omitted as appropriate.

The ground steam condensing device 26 of the comparative example includes a ground steam condensing unit 7 and an exhaust unit 28.
The exhaust part 28 of this comparative example includes a condensate part side line La communicating with the ground steam condensate part 7 and a first exhaust line Lb branched from the exhaust branch part J1 at the downstream end of the condensate part side line La. And a second exhaust line Lc, and an exhaust merging line Le extending from the exhaust merging portion J4 where the downstream end of the first exhaust line Lb and the downstream end of the second exhaust line Lc merge to the exhaust port 28a. ing. The first exhaust line Lb is provided with a first exhaust fan 9b, a first check valve 10b, and a first adjustment valve 11b in order from the upstream side. The second exhaust line Lc is provided with a second exhaust fan 9c, a second check valve 10c, and a second adjustment valve 11c in order from the upstream side.

The basic operation of the exhaust part 28 in the ground steam condensing device 26 of the comparative example will be described. In the exhaust portion 28 of the comparative example, it is assumed that the first exhaust line Lb is a regular exhaust line and the second exhaust line Lc is a standby exhaust line.
Due to the operation of the first exhaust fan 9b, the exhaust inside the ground steam condensing unit 7 of the comparative example is introduced into the condensate unit side line La as indicated by an arrow E9 shown in FIG. It is introduced into the first exhaust line Lb. Then, the exhaust passes through the first exhaust fan 9b, the first check valve 10b, and the first adjustment valve 11b as shown by an arrow E9 in FIG. 4, and passes through the exhaust merging line Le from the exhaust merging portion J4. And is discharged into the atmosphere from the exhaust port 28a. At this time, the second exhaust fan 9c on the standby side is not operating, and there is no exhaust flowing through the second exhaust line Lc from the ground steam condensing unit 7 toward the exhaust port 28a.

  Therefore, part of the exhaust gas that has reached the exhaust gas merging portion J4 through the first exhaust line Lb flows from the exhaust gas merging portion J4 to the second exhaust line Lc that is the standby side, and moisture contained in the exhaust gas is discharged. It is cooled by the outside air and drained. The drain generated in this way accumulates in the exhaust pipe on the downstream side (region A shown in FIG. 4) from the second check valve 10c of the second exhaust line Lc.

  Moreover, since the opening of the exhaust port 28a of the comparative example is directed substantially upward in the vertical direction, rainwater, snow, or the like easily flows into the exhaust portion 28 from the exhaust port 28a. When rainwater or the like that has flowed into the exhaust section 28 flows into the second exhaust line Lc that is the standby side, the rainwater or the like is located downstream of the second check valve 10c in the second exhaust line Lc (region A shown in FIG. 4). Accumulate in the exhaust pipe.

  The second exhaust fan 9c without discharging drainage, rainwater, or the like accumulated in the exhaust pipe downstream (region A shown in FIG. 4) of the second check valve 10c of the second exhaust line Lc on the standby side. Is activated, the drain or the like accumulated by the opening of the second check valve 10c flows into the casing of the second exhaust fan 9c, and an overload is applied to the circuit of the drive unit (not shown) of the second exhaust fan 9c. The second exhaust fan 9c trips and stops. For this reason, before the second exhaust fan 9c is started, a drainage operation of accumulated drain is urgently required. Further, when the first exhaust fan 9b on the normal side is urgently stopped due to a failure or the like and the second exhaust fan 9c on the standby side is automatically activated, the second exhaust fan is caused by a trip due to accumulated drain or the like. When 9c stops, there is a problem that the driving of the steam turbine 1 and consequently the operation of the steam power plant is hindered.

On the other hand, since the exhaust part 8 of the ground steam condensing device 6 of the present embodiment includes the communication line Ld, even if the standby side second exhaust fan 9c is stopped, the exhaust part 8 is exhausted. Is discharged through the downstream second exhaust line Lc2 downstream from the second check valve 10c. Therefore, according to the present embodiment, it is possible to prevent drainage from accumulating as much as possible in the exhaust pipe downstream of the check valve of the standby exhaust line.
Moreover, since the exhaust pipe provided with the exhaust port 8a is curved so that the opening of the exhaust port 8a faces downward, the inflow of rainwater or the like from the exhaust port 8a can be prevented.
Therefore, according to the present embodiment, it is possible to start the standby exhaust fan without draining the drain that has been accumulated in the exhaust pipe of the standby exhaust line in advance. Stoppage and damage due to exhaust fan clips can be greatly reduced. Therefore, the standby-side exhaust fan can be quickly and reliably started, and the ground steam condensing device 6 can be stably operated continuously. And thereby, according to this embodiment, the stable driving | operation of a steam power plant can be performed.

Moreover, according to this embodiment, it is only necessary to provide the contact line Ld and the contact line regulating valve 11d, and no significant equipment change is required. it can.
Furthermore, according to the present embodiment, since the communication line Ld and the communication line regulating valve 11d are provided, it is possible to use the first exhaust line Lb as the standby side and the second exhaust line Lc as the regular side. Yes, the standby side and the regular side can be appropriately switched according to the maintenance of the exhaust fan and the like.
Furthermore, according to the present embodiment, the communication line adjusting valve 11d can adjust the flow rate of the exhaust gas. Since the amount of exhaust gas to be introduced can be adjusted, drainage accumulated in the exhaust pipe on the downstream side of the check valve on the standby side exhaust line can be more efficiently reduced.

(Deformation)
The present invention is not limited to the embodiment described above, and various modifications and changes are possible, and these are also within the scope of the present invention.
(1) In the present embodiment, the communication line Ld includes the communication line adjustment valve 11d. However, the present invention is not limited thereto, and may include a communication line check valve, for example.
FIG. 5 is a view showing a modified grand steam condensing device.
The ground steam condensing device 6A according to the modification shown in FIG. 5 includes a ground steam condensing unit 7 and an exhaust unit 8A. In the exhaust section 8A, the first exhaust line Lb is always on the regular side, the second exhaust line Lc is always on the standby side, and a communication line check valve 10d is provided on the communication line Ld. This connection line check valve 10d prevents the inflow of exhaust gas from the second exhaust line Lc side to the first exhaust line Lb side. That is, the modified exhaust portion 8A is provided with a communication line check valve 10d instead of the communication line adjustment valve 11d provided in the communication line Ld, as compared with the exhaust portion 8 of the above-described embodiment. Except for the differences, the embodiment is substantially the same as the embodiment described above.

In the exhaust part 8A of this modified embodiment, the exhaust discharged from the ground steam condensate part 7 by the operation of the first exhaust fan 9b passes through the condensate part side line La as shown by an arrow E11 in FIG. The exhaust gas is introduced from the exhaust branch portion J1 to the upstream first exhaust line Lb1, and reaches the connection portion J2 through the first check valve 10b. Then, the exhaust gas is branched at the connection portion J2, a part thereof is introduced into the connection line Ld, and the rest is introduced into the downstream side first exhaust line Lb2.
Exhaust gas introduced into the downstream first exhaust line Lb2 flows through the downstream first exhaust line as shown by an arrow E12 shown in FIG. Further, the exhaust gas introduced into the communication line Ld side flows from the connection portion J3 through the downstream second exhaust line Lc2 to the exhaust gas junction portion J4 as indicated by an arrow E13 shown in FIG. These exhaust gases are merged at the exhaust merge portion J4, and are discharged into the atmosphere from the exhaust port 8a through the exhaust merge line Le as indicated by an arrow E14 in FIG.
Therefore, according to this modification, since the exhaust passes through the downstream second exhaust line Lc2 downstream from the second check valve 10c, the drain accumulated in the exhaust pipe downstream from the second check valve 10c is reduced. Can be reduced.
As a modification, the communication line Ld may not be provided with the communication line regulating valve 11d of the present embodiment or the above-described communication line check valve 10d. In this case, implementation can be performed more easily, and the cost for implementation can be further suppressed.

(2) In the present embodiment, the exhaust unit 8 communicates with the ground steam condensate unit 7 and extends upward in the substantially vertical direction. However, the present invention is not limited to this example. Only the exhaust merging line Le communicating with the port 8a may extend substantially upward in the vertical direction, or the downstream first exhaust line Lb2, the downstream second exhaust line Lc2, and the exhaust merging line Le extend upward in the vertical direction. There is no particular limitation.

  In addition, although this embodiment and modification can also be used in combination as appropriate, detailed description is abbreviate | omitted. Further, the present invention is not limited to the embodiment described above.

DESCRIPTION OF SYMBOLS 1 Steam turbine 2 Rotor 3 Ground part 4 Ground part 5 Ground steam line 6 Ground steam condensing apparatus 7 Ground steam condensing part 8 Exhaust part 9b 1st exhaust fan 9c 2nd exhaust fan 10b 1st check valve 10c 2nd reverse Stop valve 11b First adjustment valve 11c Second adjustment valve 11d Connection line adjustment valve La Condensate part side line Lb First exhaust line Lc Second exhaust line Ld Connection line Le Exhaust merge line

Claims (4)

A ground steam condensing device that drains and collects ground steam used for sealing a ground portion of a steam turbine,
A ground steam condensate for condensing and draining the ground steam;
An exhaust part for exhausting the exhaust inside the grand steam condensate part from an exhaust port communicating with the grand steam condensate part;
With
The exhaust part is
A condensate section side line communicating with the grand steam condensate section;
A first exhaust line and a second exhaust line branched from the downstream end of the condensate portion side line;
A first exhaust fan provided in the first exhaust line;
A second exhaust fan provided in the second exhaust line;
An exhaust merging line extending from the exhaust merging portion where the downstream end of the first exhaust line and the downstream end of the second exhaust line merge to the exhaust outlet side;
A first check valve provided on the downstream side of the first exhaust fan in the first exhaust line to prevent a backflow of exhaust to the ground steam condensing part side;
A second check valve provided on the downstream side of the second exhaust fan in the second exhaust line and preventing a backflow of exhaust to the ground steam condensing part side;
A communication line for communicating the downstream side of the first exhaust fan in the first exhaust line with the downstream side of the second exhaust fan in the second exhaust line;
A ground steam condensate device. The communication line is provided with a communication line adjustment valve capable of adjusting the flow rate of the exhaust,
The ground steam condensing device according to claim 1. The communication line is provided with a check valve for a communication line that prevents inflow of exhaust gas from the second exhaust line side to the first exhaust line side;
The ground steam condensing device according to claim 1. The exhaust pipe having the exhaust port is curved so that the exhaust port opens downward;
The ground steam condensing device according to any one of claims 1 to 3, wherein

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