JP2014062587A - Pressure relief device for steam condenser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pressure relief device for a steam condenser that easily detects damage to a pressure relief plate.SOLUTION: A pressure relief device 10 includes: hollow bellows 1 serving as a sealing case; and a pointer vacuum gauge 2. The bellows 1 covers a pressure relief plate 82 and seals a tip end of a pressure relief pipe 81. The pointer vacuum gauge 2 is connected to the bellows 1 and can measure a pressure in the bellows 1. If the pressure relief plate 82 is damaged, the pressure in the bellows 1 is as high as a pressure in a barrel part 7. It is easy to detect the pressure relief plate 82 being damaged by confirming change in measured value of the pointer vacuum gauge 2 which measures the pressure in the bellows 1. Further, it is easy to detect the pressure relief plate 82 in a high place being damaged without climbing up a steam condenser 70 by confirming change in measured value of the pointer vacuum gauge 2 from a distance.

Description

  The present invention relates to a pressure relief device for a condenser. In particular, the present invention relates to the structure of a pressure relief device for a condenser that is installed in a pressure relief pipe provided at the top of the condenser and that easily detects damage to a pressure relief plate provided at the tip of the pressure relief pipe.

  In general, in a thermal power plant, a turbine is rotated by steam generated by a boiler or the like, and electric power is generated by a generator connected to the turbine. The condenser cools and condenses the water vapor after operating the turbine, and returns it to a low-pressure saturated liquid (condensate). For example, this condensate is reused as turbine steam.

  FIG. 5 is a perspective view showing a configuration of an example of the condenser described above. Referring to FIG. 5, the condenser 70 is composed of a robust box-shaped body portion 7. Steam Vp after operating a turbine (not shown) is supplied to the body portion 7 from above. A pair of water chambers 7 a and 7 b and a pair of water chambers 7 c and 7 d are arranged on both wings of the body portion 7.

  Referring to FIG. 5, a plurality of cooling pipes 7 p pass through the body portion 7. Then, by passing seawater W as cooling water through these cooling pipes 7p through the pair of water chambers 7a and 7b and the pair of water chambers 7c and 7d, the steam inside the body portion 7 is cooled. Can be condensed. Thus, the condenser 70 has a configuration in which the cooling water does not directly contact the turbine steam. The configuration of such a condenser is disclosed in Patent Document 1, for example.

  Referring to FIG. 5, a part of the steam Vp after operating the turbine is supplied from the side surface portion of the trunk portion 7 through the recovery valve 7v. When the recovery valve 7v is opened, a part of the water vapor Vp can be recovered in the body portion 7. When the recovery valve 7v is closed, supply of a part of the water vapor Vp is blocked.

  Referring to FIG. 5, a pressure relief device 80 according to the prior art is installed on the upper portion of the body portion 7. FIG. 6 is a perspective view of a pressure relief device for a condenser according to the prior art. FIG. 7 is a longitudinal sectional view of a pressure relief device for a condenser according to the prior art.

  Referring to FIG. 6 or FIG. 7, a conventional pressure relief device 80 includes a pressure relief pipe 81 and a pressure relief plate 82. The pressure relief pipe 81 is disposed so as to stand on the upper portion of the body portion 7. Further, the inside of the pressure release pipe 81 communicates with the inside of the body portion 7. The pressure release plate 82 is disposed so as to seal the tip end side of the pressure release pipe 81. The pressure release plate 82 is fixed to the distal end side of the pressure release pipe 81 by a ring plate 82r.

  Referring to FIG. 5, while the operation of the turbine (not shown) is stopped, the inside of the body portion 7 is at atmospheric pressure. In this case, part of the water vapor Vp may flow into the body portion 7 due to deterioration of the seal of the recovery valve 7v. And the inside of the trunk | drum 7 may become more than predetermined pressure.

  5 to 7, the pressure relief device 80 is configured such that the pressure relief plate 82 is ruptured when the inside of the body portion 7 reaches a predetermined pressure or more. Thereby, the internal pressure of the trunk | drum 7 can be discharge | released to air | atmosphere, and the condenser 70 can be protected.

  Referring to FIG. 6 or FIG. 7, a rigid protective plate 83 is provided at the distal end of the pressure release pipe 81 to protect the pressure release plate 82 from popping out when the pressure release plate 82 is ruptured. The peripheral edge of the protection plate 83 is fixed to the pressure relief pipe 81 with a number of bolts 83b.

JP 2011-2162 A

  With reference to FIG. 5, during operation of a turbine (not shown), the interior of the body portion 7 is evacuated to introduce the steam Vp after the turbine is operated into the body portion 7. That is, during normal operation, the inside of the body portion 7 is in a negative pressure state.

  However, if the pressure release plate 82 is damaged, the air flows into the body part 7 and the degree of vacuum of the body part 7 decreases. And in order to identify the factor of such a fall of the vacuum degree of the trunk | drum 7, the damage state of the pressure-release plate 82 may be confirmed (refer FIG. 6 or FIG. 7).

  With reference to FIG. 6 or FIG. 7, conventionally, in order to confirm cracks that are difficult to confirm from the appearance, smoke such as incense sticks is brought close to the pressure release pipe 81 and smoke is sucked into the inside through the protective plate 83. As a result, the breakage state of the pressure release plate 82 was confirmed.

  However, there is a problem that it is difficult to confirm the damage state of the pressure release plate 82 with a small amount of smoke generated from an incense stick or the like. There has been a need for a condenser pressure relief device that easily detects damage to the pressure relief plate. The above can be said to be the subject of the present invention.

  This invention is made | formed in view of such a subject, and it aims at providing the pressure relief device of the condenser which detects the damage of a pressure relief plate easily.

  In order to achieve the above object, the present inventor has found that the internal pressure of the sealing case installed outside the pressure release plate is measured, and by displaying the measured value, damage to the pressure release plate can be easily confirmed, Based on this, the inventors have invented the following new condenser pressure relief device.

  (1) A condenser pressure relief device according to the present invention is provided in an upper part of the condenser, and an inside is installed in a pressure relief pipe communicating with the inside of the condenser, and is provided at a tip part of the pressure relief pipe. A pressure relief device for a condenser for detecting damage to a pressure relief plate, a hat-like sealing case that covers the pressure relief plate and seals a distal end portion of the pressure relief pipe, and is connected to the seal case, the seal Measuring means for measuring the internal pressure of the case.

  (2) The sealing case includes a hollow bellows disposed so as to protrude from the distal end surface of the pressure relief tube, and the bellows is fixed at the proximal end portion of the pressure relief tube, and the distal end portion is closed. In addition, it is preferable that the inside of the bellows is connected to the inside of the pressure relief pipe via the pressure relief plate.

  (3) It is preferable that the bellows has a lattice-like groove at the tip portion that is easily broken when the internal pressure rises to a predetermined value or more.

  (4) The measuring means may comprise a vacuum gauge with a needle.

  (5) The measuring means includes a pressure transmitter that converts a measured pressure value into an electric signal value, and is connected to the pressure transmitter, and a predetermined pressure value and an electric signal value transmitted from the pressure transmitter. And determining means for determining damage to the pressure relief plate; and a notifying means for connecting to the determination means and notifying a warning when a signal for determining damage to the pressure release plate is transmitted from the determination means; , May be further provided.

  A pressure relief device for a condenser according to the present invention includes a hat-like sealing case that covers a pressure relief plate and seals the distal end portion of a pressure relief pipe, and a measuring unit that is connected to the sealing case and measures the internal pressure of the sealing case. , And the measuring means is composed of a vacuum gauge with a placement needle, and by checking the placement value of the vacuum gauge, damage to the pressure relief plate can be easily detected.

  In the condenser pressure relief device according to the present invention, the measuring means is constituted by a pressure transmitter, and an alarm is notified based on the electric signal value transmitted from the pressure transmitter, thereby damaging the pressure relief plate. Easy to detect.

It is a perspective view which shows the structure of the pressure relief device of the condenser by 1st Embodiment of this invention. It is a longitudinal cross-sectional view which shows the structure of the pressure relief device of the condenser by 1st Embodiment. It is a front view which shows the structure of the vacuum gauge with a placement needle with which the pressure relief device of the condenser by 1st Embodiment is equipped. It is a functional block diagram which shows the structure of the pressure relief device of the condenser by 2nd Embodiment of this invention. It is a perspective view which shows the structure of an example of the condenser which concerns on this invention. It is a perspective view of the pressure relief device of the condenser by a prior art. It is a longitudinal cross-sectional view of the pressure relief device of the condenser by a prior art.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
[First Embodiment]
(Configuration of condenser pressure relief device)
Initially, the structure of the pressure relief device of the condenser by 1st Embodiment of this invention is demonstrated. FIG. 1 is a perspective view showing a configuration of a pressure relief device for a condenser according to a first embodiment of the present invention.

  FIG. 2 is a longitudinal sectional view showing the configuration of the pressure relief device of the condenser according to the first embodiment. FIG. 3 is a front view showing a configuration of a vacuum gauge with a placement needle provided in the pressure relief device of the condenser according to the first embodiment. In addition, since the effect | action is the same as the component which has the code | symbol same as the code | symbol used by the prior art, description may be abbreviate | omitted.

  Referring to FIG. 1 or FIG. 2, a condenser pressure relief device (hereinafter abbreviated as “pressure relief device”) 10 according to the first embodiment and a metal hollow bellows 1 serving as a hat-shaped sealing case are measured. A vacuum gauge 2 with a needle is provided as a means. The bellows 1 covers the pressure release plate 82 and seals the tip of the pressure release pipe 81. A vacuum gauge 2 with a needle is connected to the bellows 1 and can measure the internal pressure of the bellows 1.

  Referring to FIG. 1 or FIG. 2, the bellows 1 is disposed so as to protrude from the distal end surface of the pressure relief pipe 81. The bellows 1 includes a bellows main body 11 and a hat body 12. The outer periphery of the base end of the bellows body 11 is fixed to the inner periphery of the hat body 12 by welding. The flange portion of the hat body 12 is fixed to the distal end surface of the pressure release pipe 81 with a bolt 82b. It is preferable to install a ring-shaped packing (not shown) between the flange portion of the hat body 12 and the protection plate 83.

  1 or 2, the front end surface 13 of the bellows body 11 is closed. The bellows 1 is connected to the inside of the pressure relief pipe 81 through the pressure relief plate 82 so as to be able to communicate therewith.

  The illustrated bellows 1 has a pressure resistance lower than the pressure resistance of the pressure release plate 82. The bellows 1 seals the pressure release pipe 81. However, when the pressure release plate 82 is damaged, such as a crack, the bellows 1 communicates with the inside of the body portion 7 (see FIG. 5). It is a reversible deformation structure that can absorb changes.

  Referring to FIG. 1, the bellows 1 has a lattice-like groove 13 a that can be easily broken, formed on the tip surface 13. When the internal pressure of the body part 7 rises (see FIG. 5) and the pressure release plate 82 is broken, the internal pressure of the bellows 1 rises and the tip surface 13 can be broken.

  Referring to FIG. 3, the vacuum gauge 2 with a placement needle includes a vacuum gauge body 21, a pointer 2a, and a placement needle 2b. The vacuum gauge main body 21 is connected to the distal end portion of the connection pipe 15. The base end portion of the connection pipe 15 is connected to the hat body 12 of the bellows 1.

  Referring to FIGS. 1 to 3, when the degree of vacuum of bellows 1 decreases, pointer 2a rotates in one direction, and the degree of vacuum can be measured from the scale value corresponding to pointer 2a. When the degree of vacuum of the bellows 1 increases, the pointer 2a rotates in the other direction, and the degree of vacuum can be measured from the scale value corresponding to the pointer 2a. The placement needle 2b is interlocked with the pointer 2a and can be stopped at either the maximum value or the minimum value.

(Operation of condenser pressure relief device)
Next, the operation and effect of the pressure relief device 10 according to the first embodiment will be described. Referring to FIGS. 1 to 3, the pressure relief device 10 according to the first embodiment is used when the vacuum degree of the body portion 7 is lowered due to an unexpected cause (see FIG. 5) and the pressure relief plate 82 is damaged. The internal pressure of the bellows 1 and the internal pressure of the body part 7 are the same. And it can detect that the pressure-release plate 82 is damaged by confirming the change of the measured value of the vacuum gauge 2 with a stylus which measures the internal pressure of the bellows 1.

  As described above, the pressure release device 10 according to the first embodiment includes the vacuum gauge 2 with a placement needle that measures the internal pressure of the bellows 1 that communicates with the body portion 7 when the pressure release plate 82 is damaged. Therefore, the damage of the pressure release plate 82 can be easily detected by confirming the needle placement value of the vacuum gauge 2 with a needle placement. In addition, by confirming the needle placement value of the vacuum gauge 2 with a needle placement from a distance, it is possible to detect damage to the high pressure release plate 82 without climbing the condenser 70.

  On the other hand, referring to FIG. 1 or FIG. 2, the pressure relief device 10 according to the first embodiment is used when the inside of the body portion 7 becomes a predetermined pressure or more (see FIG. 5) and the pressure relief plate 82 is ruptured. Since the lattice-shaped grooves 13a that are easily broken are formed on the tip surface 13, the internal pressure of the bellows 1 is increased, and the tip surface 13 of the bellows 1 can be broken. Alternatively, the bellows body 11 can be broken. And the internal pressure of the trunk | drum 7 can be discharge | released to air | atmosphere, and the condenser 70 can be protected (refer FIG. 5).

[Second Embodiment]
(Configuration of condenser pressure relief device)
Next, the structure of the pressure relief device of the condenser by 2nd Embodiment of this invention is demonstrated. FIG. 4 is a functional block diagram showing the configuration of the condenser pressure relief device according to the second embodiment of the present invention. In addition, since the operation | movement of the component of the code | symbol same as the code | symbol used except FIG. 4 makes those effect | actions, it may omit in the following description.

  If FIG. 4 is referred, the pressure release apparatus 20 by 2nd Embodiment is provided with the pressure transmitter 3 used as the bellows 1 and a measurement means. A commercial item can be used for the pressure transmitter 3. The pressure transmitter 3 is connected to the bellows 1 and can measure the internal pressure of the bellows 1. And the pressure transmitter 3 can convert the measured pressure value into an electric signal value.

  Referring to FIG. 4, the pressure relief device 20 further includes a determination unit 4 and a notification unit 5. The determination unit 4 is connected to the pressure transmitter 3. The determination unit 4 can determine whether the pressure release plate 82 is damaged by comparing the reference pressure value 4 a with the electric signal value transmitted from the pressure transmitter 3.

  Referring to FIG. 4, the notification unit 5 is connected to the determination unit. The notification means 5 can notify an alarm when a signal for determining damage to the pressure release plate 82 is transmitted from the determination means 4. The notification means 5 can use a lamp or a speaker. The notification means 5 may use a lamp and a speaker together. The notification means 5 is preferably installed in the cab or central control room.

(Operation of condenser pressure relief device)
Next, the operation and effect of the pressure relief device 20 according to the second embodiment will be described. Referring to FIG. 4, the pressure relief device 10 according to the first embodiment has a bellows when the vacuum degree of the body portion 7 is lowered due to an unexpected cause (see FIG. 5) and the pressure relief plate 82 is damaged. 1 and the internal pressure of the body part 7 are the same. And by notifying the alarm based on the electric signal value transmitted from the pressure transmitter 3 that measures the internal pressure of the bellows 1, it is possible to damage the pressure relief plate 82 at a high place without climbing the condenser 70. It can be easily detected.

  In the condenser pressure relief device according to the present invention, a vacuum gauge with a placement needle is used as means for measuring the internal pressure of the bellows 1, but a device for notifying an alarm may be connected to the vacuum gauge with a placement needle. The pressure relief device for a condenser according to the present invention can be added to an existing pressure relief device, and can detect damage to a high pressure relief plate without climbing the condenser.

1 Bellows (sealed case)
2 Vacuum gauge with needle (measuring means)
10 Pressure relief device (pressure release device for condenser)
70 condenser 81 pressure relief pipe 82 pressure relief plate

Claims (5)

A pressure relief device for a condenser that is provided in an upper part of the condenser and that is installed in a pressure relief pipe that communicates with the inside of the condenser, and that detects damage to a pressure relief plate provided at the tip of the pressure relief pipe. There,
A hat-shaped sealing case that covers the pressure relief plate and seals the tip of the pressure relief pipe;
A condenser pressure relief device comprising: a measuring means connected to the sealing case and measuring an internal pressure of the sealing case. The sealing case is composed of a hollow bellows disposed so as to protrude from the distal end surface of the pressure relief pipe,
The bellows has a proximal end fixed to the distal end surface of the pressure relief pipe, the distal end is closed, and the inside of the bellows is connected to the inside of the pressure relief pipe via the pressure relief plate. The condenser pressure relief device according to claim 1.   3. The condenser pressure relief device according to claim 2, wherein the bellows has a lattice-like groove at the tip portion that is easily broken when the internal pressure rises to a predetermined value or more.   The pressure-reducing device for a condenser according to any one of claims 1 to 3, wherein the measuring means comprises a vacuum gauge with a needle. The measuring means comprises a pressure transmitter that converts a measured pressure value into an electric signal value,
A determination unit that connects to the pressure transmitter, compares a predetermined pressure value with an electric signal value transmitted from the pressure transmitter, and determines damage to the pressure release plate;
The condensate according to any one of claims 1 to 3, further comprising a notifying unit that is connected to the determining unit and that issues a warning when a signal that determines damage to the pressure relief plate is transmitted from the determining unit. Pressure relief device.

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