Atmospheric emission device and geothermal power generation system

Abstract

To provide an atmospheric emission device and a geothermal power generation system capable of preventing operation stop of a power generation plant due to fracture of an atmospheric emission plate by enabling the atmospheric emission plate to be opened / closed repeatedly.SOLUTION: An atmospheric emission device includes: an atmospheric emission plate capable of emitting steam in a steam turbine or a steam condenser from an atmospheric emission port of the steam turbine or the steam condenser to the atmosphere; an opening / closing mechanism provided directly or indirectly at the atmospheric emission port, and attached to the atmospheric emission plate, which enables the atmospheric emission plate to be opened / closed repeatedly; and a seal mechanism provided at the atmospheric emission port, whose downstream side end surface is positioned on a first reference surface, which is a closed state position, and which press-bonds the atmospheric emission port and the atmospheric emission plate together when the atmospheric emission plate is in the closed state while whose downstream side end surface is positioned downstream of the first reference surface when the atmospheric emission plate is in the open state.SELECTED DRAWING: Figure 2(a)

Description

[Technical field]

[0001] SUMMARY OF THE DISCLOSURE Embodiments of the present invention relate to an atmospheric emission device and a geothermal power generation system. [Background technology]

[0002] Geothermal power generation is a power generation system that utilizes the heat of the earth's magma. In geothermal power generation, steam heated by magma in a production well is led to a steam turbine. When this steam performs expansion work in the steam turbine, the driving force is transmitted to the generator via the main shaft of the steam turbine, and the generator generates electricity. After performing expansion work in the steam turbine, the steam is led from the exhaust chamber of the steam turbine to a condenser, where it is cooled and then returned to the injection well. Here, since steam, which is the working fluid of geothermal power generation, contains a large amount of non-condensable gases, the internal pressure of the steam turbine or condenser tends to easily rise when an abnormality occurs in the operating condition of the steam turbine or condenser. Therefore, the steam turbine or condenser of geothermal power generation is equipped with an air release device that can release the steam inside the steam turbine or condenser to the atmosphere when the internal pressure abnormally rises. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2019-78353 A Summary of the Invention [Problem to be solved by the invention]

[0004] In particular, when a condenser is provided with an atmosphere relief device, the atmosphere relief plate of the atmosphere relief device may be blown up to release the steam inside the condenser into the atmosphere in order to prevent damage to the condenser when the internal pressure of the condenser abnormally rises. However, once the atmosphere relief plate is blown up, it is not possible to reuse the atmosphere relief plate and return it to its original state, and it is necessary to replace the atmosphere relief plate with a new one.

[0005] Furthermore, geothermal power plants are often built in mountainous regions, and if workers are unable to access the geothermal power plant due to snowfall or other reasons, it may not be possible to quickly replace the atmospheric relief plate even if it ruptures, and recovery work for the geothermal power plant may take a long time.

[0006] The present invention has been made to solve the above-mentioned problems, and its object is to provide an atmosphere release device and a geothermal power generation system that can prevent the power plant from being shut down due to the rupture of the atmosphere release plate by enabling the atmosphere release plate to be opened and closed repeatedly. [Means for solving the problem]

[0007] In order to achieve the above object, an atmosphere release device in an embodiment of the present invention includes an atmosphere release plate capable of releasing steam inside the steam turbine or the condenser to the atmosphere from an atmosphere release port of the steam turbine or the condenser; an opening and closing mechanism that is provided directly or indirectly at the atmosphere release port and attached to the atmosphere release plate, and enables the atmosphere release plate to be repeatedly opened and closed; and a sealing mechanism that is provided at the atmosphere release port, wherein when the atmosphere release plate is in a closed state, a downstream end face of the sealing mechanism is located on a first reference plane that is a position in the closed state and presses the atmosphere release port and the atmosphere release plate, and when the atmosphere release plate is in an open state, the downstream end face is located downstream of the first reference plane.

[0008] In addition, in order to achieve the above-mentioned objectives, a geothermal power generation system in an embodiment of the present invention includes a steam turbine that converts thermal energy of steam separated from geothermal fluid into rotational energy, a condenser that condenses the steam guided from the steam turbine, and an atmosphere discharge device as described in claim 1 that enables the steam inside the steam turbine or the condenser to be discharged into the atmosphere from an atmosphere discharge outlet located in the steam turbine or the condenser. [Brief description of the drawings]

[0009] [Figure 1]FIG. 1 is a schematic diagram illustrating an example of a geothermal power generation system 100 according to a first embodiment. [Figure 2(a)] FIG. 1 is a schematic diagram illustrating an example of an atmosphere discharge device in a closed state according to a first embodiment. [Figure 2(b)] FIG. 1 is a schematic diagram illustrating an example of an open state of an atmosphere emission device according to a first embodiment. [Figure 2(c)] Enlarged view of region P in Fig. 2(a) and Fig. 2(b) [Figure 3(a)] FIG. 11 is a schematic diagram illustrating an example of an atmosphere discharge device 200 in a closed state according to a second embodiment. [Figure 3(b)] FIG. 11 is a schematic diagram illustrating an example of an open state of the atmosphere emission device 200 according to the second embodiment. [Figure 4(a)] FIG. 13 is a schematic diagram illustrating an example of an open state of the atmosphere emission device 200 according to the third embodiment. [Figure 4(b)] FIG. 13 is a schematic diagram showing an example of the atmosphere release plate 201 during a closing operation in the third embodiment. [Figure 4(c)] FIG. 13 is a schematic diagram showing an example of the atmosphere release plate 201 during a closing operation in the third embodiment. [Figure 4(d)] FIG. 13 is a schematic diagram illustrating an example of the atmosphere discharge device 200 in a closed state according to the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, first to third embodiments for carrying out the invention will be described.

[0011] (First embodiment) An overall overview of a geothermal power generation system 100 will be described with reference to Figure 1. Figure 1 is a schematic diagram illustrating an example of a geothermal power generation system 100.

[0012] The geothermal power generation system 100 of this embodiment includes a steam pipe 101 , a steam turbine 102 , a generator 103 , a condenser 104 , and a condensate pipe 105 .

[0013] The steam piping 101 is connected to a steam separator (not shown) that separates the geothermal fluid ejected from a production well (not shown) into steam and hot water, and is a piping that guides the steam separated from the geothermal fluid in the steam separator (not shown) through a steam valve (not shown) to a steam turbine 102 described later.

[0014] The steam turbine 102 is a device connected to a steam pipe 101 and converts the thermal energy of the steam guided from the steam pipe 101 into rotational energy. In the steam turbine 102, the steam guided from the steam pipe 101 performs expansion work, causing rotor blades 106 to rotate, and the rotational energy is transmitted to a main shaft 108 connected to the rotor blades 106. The steam that has performed the expansion work is guided to an exhaust chamber 107 of the steam turbine 102.

[0015] The generator 103 is a turbine generator connected to the steam turbine 102 via a main shaft 108. Rotational energy is transmitted to the generator 103 from the steam turbine 102 via the main shaft 108, and the generator 103 generates electricity using this rotational energy.

[0016] The condenser 104 is connected to an exhaust chamber 107 of the steam turbine 102, and cools and condenses the steam after performing expansion work in the steam turbine 102. The condenser 104 is provided with an atmosphere release port 109 to which an atmosphere release device 200, which will be described later, is attached.

[0017] The condensate pipe 105 is connected to the condenser 104 and is a pipe that guides the condensate in the condenser 104 to an injection well (not shown).

[0018] The vacuum pump 110 is connected to the condenser 104 and is capable of maintaining a vacuum state within the condenser 104 by sucking out any air that has entered the condenser 104 to the outside in order to increase the efficiency of the cooling of the steam to condensate by the condenser 104.

[0019] The pressure gauge 111 is provided in the condenser 104 and detects the internal pressure of the condenser 104. The pressure gauge 111 is provided so that the internal pressure of the condenser 104 can be managed.

[0020] The atmosphere discharge device 200 is a safety device provided to be located above the condenser 104. When the internal pressure of the condenser 104 abnormally increases, the atmosphere discharge device 200 changes from a closed state to an open state, thereby enabling the steam inside the condenser 104 to be discharged to the atmosphere from the atmosphere discharge port 109. A detailed description of the atmosphere discharge device 200 will be given later. Note that, in the present embodiment, a case in which the atmosphere discharge device 200 is located above the condenser 104 is illustrated, but the installation position of the atmosphere discharge device 200 is not limited to this case. For example, the atmosphere discharge port 109 may be located on a side surface of the condenser 104, or the atmosphere discharge port 109 may be located in the exhaust chamber 107 of the steam turbine 102. In addition, although this embodiment illustrates a case in which the steam turbine 102 and the condenser 104 are provided in separate casings, for example, in a geothermal power generation system in which the steam turbine 102 and the condenser 104 are integrated, the atmosphere outlet 109 may be located in the casing.

[0021] Geothermal fluid ejected from a production well (not shown) is introduced into a steam separator (not shown) where it is separated into steam and hot water. The steam separated from the geothermal fluid passes through a steam pipe 101 and is introduced into a steam turbine 102, where it performs expansion work on the rotor blades 106 inside the steam turbine 102. The rotor blades 106 rotate due to the expansion work from the steam, and transmit the rotational energy to a main shaft 108. When the rotational energy is transmitted to a generator 103 via the main shaft 108, the generator 103 generates electricity. Meanwhile, the steam after performing the expansion work is introduced from an exhaust chamber 107 of the steam turbine 101 to a condenser 104, where it is cooled and turned into condensate. This condensate is returned from a condensate pipe 105 to a reinjection well (not shown). When the internal pressure of the condenser 104 increases abnormally, the atmosphere release device 200 switches from a closed state to an open state, thereby releasing the steam in the condenser 104 from the atmosphere release port 109 to the atmosphere.

[0022] Next, a detailed configuration and operation of the atmosphere discharge device 200 will be described with reference to Fig. 2. Fig. 2 is a diagram showing an example of the atmosphere discharge device 200, in which Fig. 2(a) shows an example of the atmosphere discharge device 200 in a closed state, Fig. 2(b) shows an example of the atmosphere discharge device 200 in an open state, and Fig. 2(c) shows an enlarged view of an area P in Fig. 2(a) and Fig. 2(b).

[0023] As shown in FIG. 2( a ) or FIG. 2 ( b ), the atmosphere relief device 200 includes an atmosphere relief plate 201 , an opening / closing mechanism 202 , a sealing mechanism 203 , and an attachment portion 204 .

[0024] 2(a), the atmosphere release disc 201 is provided so as to block the atmosphere release port 109 (hereinafter, the state in which the atmosphere release port 109 is blocked is referred to as a closed state). The atmosphere release disc 201 opens when the internal pressure of the condenser 104 increases abnormally, and releases the steam in the condenser 104 from the atmosphere release port 109 of the condenser 104 to the atmosphere (hereinafter, the state in which the steam is released to the atmosphere is referred to as an open state). The case in which the internal pressure of the condenser 104 increases abnormally here refers to, for example, a case in which the internal pressure of the condenser 104 increases to such an extent that the force applied to the atmosphere release disc 201 from the steam in the condenser 104 exceeds the combined force of the weight of the atmosphere release disc 201 and the atmospheric pressure applied to the atmosphere release disc 201.

[0025] The opening and closing mechanism 202 is, for example, an opening and closing mechanism such as a hinge. In this embodiment, the opening and closing mechanism 202 is provided to the atmosphere vent port 109 via an attachment portion 204, and is attached to the atmosphere vent plate 201. A rotational torque is applied to the atmosphere vent plate 201 with the opening and closing mechanism 202 as a rotation axis, thereby enabling the opening and closing mechanism 202 to repeatedly open and close the atmosphere vent plate 201. Note that, in this embodiment, a case is illustrated in which the opening and closing mechanism 202 is indirectly provided to the atmosphere vent port 109, that is, via the attachment portion 204, but, for example, the opening and closing mechanism 202 may be directly provided to the atmosphere vent port 109.

[0026] The sealing mechanism 203 is, for example, a sealing mechanism such as a seal packing, a gasket, or an O-ring. In this embodiment, the sealing mechanism 203 is configured such that a gasket 203a is provided on the atmosphere release port 109 and an O-ring 203b is provided on the atmosphere release plate 201. Specifically, as shown in FIG. 2(c), when the atmosphere release plate 201 is in the closed state (as in FIG. 2(a)), the gasket 203a is provided such that a downstream end surface 203c of the gasket 203a is in pressure contact with the atmosphere release plate 201 at a first reference surface 205, which is the position of the atmosphere release plate 201 in the closed state. The downstream side here refers to the downstream side of the flow direction of the steam at the atmosphere release port 109 when the steam inside the condenser 104 is released from the atmosphere release port 109. Moreover, the term "pressure-bonded" refers to a state in which the gasket 203a and the atmosphere release plate 201 are in contact with each other in a state in which the steam in the condenser 104 is sealed to such an extent that it does not leak from the atmosphere release port 109. On the other hand, when the atmosphere release plate 201 is in an open state (as in FIG. 2(b)), the gasket 203a is provided so that the downstream end surface 203c of the gasket 203a is located downstream of the first reference surface 205. That is, when the atmosphere release plate 201 is in an open state, the downstream end surface 203c of the gasket 203a is located downstream of the first reference surface 205, and when the atmosphere release plate 201 is closed, the downstream end surface 203c of the gasket 203a is pushed up to the first reference surface 205 by the atmosphere release plate 201 receiving the combined force of the weight of the atmosphere release plate 201 and the force received from the atmospheric pressure. This makes it possible to fill the gap between the atmosphere release plate 201 and the atmosphere release port 109. In this embodiment, a configuration is exemplified in which, as the sealing mechanism 203, in addition to the gasket 203a provided at the atmosphere vent port 109, an O-ring 203b is also provided at the atmosphere vent plate 201; however, it is sufficient that the sealing mechanism 203 is provided with a member having a sealing function at least at the atmosphere vent port 109.

[0027] When the internal pressure of the condenser 104 abnormally rises to a level exceeding the resultant force of the weight of the atmosphere release disc 201 and the atmospheric pressure acting on the atmosphere release disc 201, and a rotational torque in the opening direction is applied to the atmosphere release disc 201, the atmosphere release disc 201 opens, and the steam in the condenser 104 is released to the atmosphere from the atmosphere release port 109 (the state changes from FIG. 2(a) to FIG. 2(b)). At this time, since the atmosphere release disc 201 is attached to the opening / closing mechanism 202, the atmosphere release disc 201 does not explode to the outside or upstream of the atmosphere release port 109. After this, since a rotational torque in the closing direction is applied to the atmosphere release disc 201 due to its own weight, the atmosphere release disc 201 performs a closing operation and closes the atmosphere release port 109 again (the state changes from FIG. 2(b) to FIG. 2(a)). At this time, the atmosphere relief plate 201, receiving the combined force of its own weight and the atmospheric pressure, presses the sealing mechanism 203 up to the first reference surface 205, and the sealing mechanism 203 seals the gap between the atmosphere relief plate 201 and the atmosphere relief port 109 due to the pressure difference between the internal pressure of the condenser 104 and the external atmospheric pressure (the case of FIG. 2(a) in FIG. 2(c)). As a result, the vacuum inside the condenser 104 is maintained even after the atmosphere relief plate 201 closes the atmosphere relief port 109 again.

[0028] According to the above-described first embodiment, the atmosphere release plate 201 is attached to the opening and closing mechanism 202 as the atmosphere release device 200, so that when the internal pressure of the condenser 104 increases abnormally and the atmosphere release plate 201 opens, the atmosphere release plate 201 does not burst to the outside or upstream of the atmosphere release port 109. In addition, by providing the sealing mechanism 203 so that the downstream end face 203c of the sealing mechanism 203 is located downstream of the first reference plane 205 when the atmosphere release plate 201 is in the open state, the sealing mechanism 203 is pushed up to the first reference plane 205 when the atmosphere release plate 201 closes the atmosphere release port 109 again, and the sealing mechanism 203 can seal the gap between the atmosphere release plate 201 and the condenser 104. As a result, the atmosphere release plate 201 can be repeatedly opened and closed, so that there is no need to replace the atmosphere release plate every time it bursts, as in the conventional case, and it is possible to prevent the power plant from being shut down due to the atmosphere release plate bursting.

[0029] As a modified example of this embodiment, in the case where the atmosphere release plate 201 is opened with a force exceeding 90 degrees downstream, in order to prevent damage to the atmosphere release plate 201, for example, a shock absorber may be provided as a mechanism that can maintain the opening angle of the atmosphere release plate 201 at 90 degrees downstream or less.

[0030] Alternatively, as a further modified example of this embodiment, in the atmosphere release plate 201, a partition member may be provided on the downstream side of the atmosphere release plate 201, and a balance weight may be installed inside the partition member, thereby further adding a mechanism that can adjust the weight of the atmosphere release plate 201 by the number of balance weights.

[0031] Alternatively, as a further modified example of the present embodiment, a mechanism may be added to the atmosphere release disk 201 to prevent the atmosphere release disk 201 from being deformed when the atmosphere release disk 201 is opened by the internal pressure of the condenser 104, such as by providing a reinforcing member on the downstream side of the atmosphere release disk 201 to reinforce the atmosphere release disk 201.

[0032] These modified examples can be arbitrarily combined with the first embodiment described above, and various omissions, substitutions, and changes are possible for the combination of modified examples. This relationship also applies to other embodiments described hereinafter.

[0033] Second embodiment The second embodiment will be described with reference to Fig. 3. Fig. 3 is a schematic diagram showing an example of a closed state and an open state of atmosphere discharge device 200, with Fig. 3(a) showing an example of a closed state of atmosphere discharge device 200 and Fig. 3(b) showing an example of an open state of atmosphere discharge device 200. Hereinafter, only the points different from the first embodiment will be described, and the other points will be assigned the same reference numerals as those in the first embodiment as they are the same as those in the first embodiment, and description of the configurations, actions, and effects thereof will be omitted.

[0034] 3(a) or 3(b), an atmosphere discharge device 200 in the second embodiment includes an atmosphere discharge plate 201, a sealing mechanism 203, an attachment portion 204, and an opening / closing mechanism 211. That is, the second embodiment differs from the first embodiment in that the opening / closing mechanism 202 is replaced with the opening / closing mechanism 211.

[0035] The opening and closing mechanism 211 is, for example, an opening and closing mechanism such as a torque hinge, and in particular includes a holding mechanism in addition to the opening and closing mechanism 202 of the first embodiment. The opening and closing mechanism 211 is attached to the atmosphere release disk 201 such that, when the atmosphere release disk 201 is in a closed state, the atmosphere release disk 201 is pressed against the downstream end surface 203c of the gasket 203a at a second reference surface 212 that is upstream of the first reference surface. When the internal pressure of the condenser 104 abnormally increases, a rotational torque is applied to the atmosphere release disk 201 with the opening and closing mechanism 211 as a rotation axis, and the atmosphere release disk 201 opens. Thereafter, the atmosphere release disk 201 tries to close due to its own weight applied to the atmosphere release disk 201, but since a frictional force is generated on the shaft portion of the opening and closing mechanism 211, the opening and closing mechanism 211 does not close the atmosphere release disk 201 unless a force exceeding the frictional force acts on the atmosphere release disk 201. In other words, when the atmosphere relief plate 201 performs an opening operation, the opening degree of the atmosphere relief plate 201 in the open state, for example, the opening degree at the point when the atmosphere relief plate 201 is fully open, can be maintained by the opening mechanism 211.

[0036] According to the second embodiment described above, the same action and effect as the first embodiment is achieved. Specifically, by attaching the atmosphere release plate 201 to the opening and closing mechanism 211, when the internal pressure of the condenser 104 increases abnormally and the atmosphere release plate 201 opens, the atmosphere release plate 201 does not explode to the outside or to the upstream side of the atmosphere release port 109. In addition, by providing the opening and closing mechanism 211 so that the atmosphere release plate 201 can be pressed against the downstream end surface 203c of the gasket 203a at the second reference surface 212 when the atmosphere release plate 201 is in the closed state, the gasket 203a can be pushed up to the second reference surface 212 when the atmosphere release plate 201 closes the atmosphere release port 109 again. As a result, the sealing mechanism 203 can further seal the gap between the atmosphere release plate 201 and the condenser 104. Furthermore, according to the second embodiment described above, when the internal pressure of the condenser 104 increases abnormally and the atmosphere relief disk 201 performs an opening operation, the opening / closing mechanism 211 can maintain the opening degree of the atmosphere relief disk 201 in the open state. As a result, it is possible to prevent the atmosphere relief disk 201 from performing a closing operation before the steam in the condenser 104 is completely released from the atmosphere relief port 109 to the atmosphere.

[0037] (Third embodiment) The third embodiment will be described with reference to Fig. 4. Fig. 4 is a schematic diagram showing an example of the closed state and the open state of the atmosphere discharge device 200, Fig. 4(a) shows an example of the open state of the atmosphere discharge device 200, Fig. 4(b) and Fig. 4(c) show an example of the closing operation of the atmosphere discharge plate 201, and Fig. 4(d) shows an example of the closed state of the atmosphere discharge device 200. Hereinafter, the points different from the first or second embodiment will be described, and the other points will be assigned the same reference numbers as those in the first or second embodiment, and the description of the configurations, actions, and effects will be omitted.

[0038] 4(a) to 4(c), the atmosphere discharge device 200 in the third embodiment includes an atmosphere discharge plate 201, a sealing mechanism 203, an attachment portion 204, an opening and closing mechanism 211, a plate-shaped member 221, an identification device 222, a solenoid valve 223, a rod-shaped member 224, and a rail 225. That is, the third embodiment differs from the first or second embodiment in that the atmosphere discharge device 200 further includes the plate-shaped member 221, the identification device 222, the solenoid valve 223, the rod-shaped member 224, and a rail 225.

[0039] The plate-like member 221 is provided on the atmosphere vent port 109 via an attachment portion 204. The plate-like member 221 is configured to extend in the longitudinal direction so as to face the atmosphere vent plate 201 in the open state. Note that, although the present embodiment illustrates an example in which the plate-like member 221 is indirectly provided on the atmosphere vent port 109, that is, provided on the atmosphere vent port 109 via the attachment portion 204, the plate-like member 221 may be directly provided on the atmosphere vent port 109, for example.

[0040] The identification device 222 is composed of a limit switch 222a and a limit switch pressing plate 222b. The limit switch 222a is provided in the atmosphere release port 109. The limit switch pressing plate 222b is provided in a position of the atmosphere release plate 201 where it can come into contact with the limit switch 222a, and presses the limit switch 222a when the atmosphere release plate 201 is in the closed state. The position where the limit switch 222a can be contacted here is the side of the atmosphere release plate 201 where the opening / closing mechanism 211 is not attached. In other words, when the atmosphere release plate 201 is in the closed state, the limit switch pressing plate 222b comes into contact with the limit switch 222a and further presses the limit switch 222a, so that the limit switch 222a identifies that the atmosphere release plate 201 is in the closed state. On the other hand, when the atmosphere release plate 201 is in the open state, the limit switch pressing plate 222b moves away from the limit switch, and the limit switch 222a identifies that the atmosphere release plate 201 is in the open state. Note that in this embodiment, a configuration is exemplified in which, as the identification device 222, in addition to the limit switch 222a provided in the atmosphere release port 109, the limit switch pressing plate 222b is also provided in the atmosphere release plate 201, but the identification device 222 only needs to have a function of identifying whether the atmosphere release plate 201 is open or closed, and may be, for example, a device that detects the distance between the atmosphere release plate 201 and the atmosphere release port 109 in a non-contact manner, or a device that determines whether the distance between the atmosphere release plate 201 and the atmosphere release port 109 is greater or smaller than a predetermined value.

[0041] The solenoid valve 223 is provided on the outside of the plate-like member 221, that is, on the side that does not face the atmosphere release plate 201 when the atmosphere release plate 201 is in an open state, and is connected to a rod-like member 224 described later (the state shown in FIG. 4(a)). When a receiving unit (not shown) of the solenoid valve 223 receives an electric signal from the outside, the solenoid valve 223 switches between an excited state and a non-excited state, and can control the extension and contraction of the rod-like member 224. When a receiving unit (not shown) of the solenoid valve 223 receives a signal from the outside that causes the solenoid valve 223 to be in an excited state, the solenoid valve 223 extends the rod-like member 224 (the state shown in FIG. 4(b)). When the rod-like member 224 extends, the rod-like member 224 closes the atmosphere release plate 201 (the state shown in FIG. 4(c)), as described later. On the other hand, when a receiving section (not shown) of the solenoid valve 223 receives an external signal to put the solenoid valve 223 into a non-excited state, the solenoid valve 223 retracts the rod-shaped member 224 (the state shown in FIG. 4(d)).

[0042] The rod-shaped member 224 is, for example, an air piston, and is provided inside the plate-shaped member 221, that is, on the side facing the atmosphere relief plate 201 when the atmosphere relief plate 201 is in the open state. When the rod-shaped member 224 is in a contracted state, the rod-shaped member 224 does not come into contact with the rail 225 even if the atmosphere relief plate 201 is in the open state (the state shown in FIG. 4(a)). When the solenoid valve 223 is excited from this state (the state shown in FIG. 4(a)), the solenoid valve 223 extends the rod-shaped member 224 and presses the rail 225 provided on the side of the atmosphere relief plate 201 facing the plate-shaped member 221 (the state shown in FIG. 4(b)). It is preferable that the extension of the rod-shaped member 224 is designed to apply a force to the rail 225 that exceeds at least a frictional force generated in the internal structure of the shaft part of the opening / closing mechanism 211. Here, the force that exceeds the frictional force generated in the internal structure of the shaft of the opening / closing mechanism 211 refers to, for example, a force that allows the rod-shaped member 224 to close the atmosphere release plate 201 to at least 45 degrees downstream. When the rod-shaped member 224 presses the atmosphere release plate 201 to at least 45 degrees downstream (the state shown in FIG. 4(c)), the atmosphere release plate 201 closes under its own weight (the state shown in FIG. 4(d)). When the atmosphere release plate 201 is in the closed state, the solenoid valve 223 is de-energized, and the rod-shaped member 224 contracts (the state shown in FIG. 4(d)).

[0043] In this embodiment, the case where the extension and contraction of the rod-shaped member 224 is controlled by the electromagnetic valve 223, which is a control mechanism, is described as an example, but this control mechanism may be a mechanism that can at least switch the extension and contraction of the rod-shaped member 224, and is not necessarily limited to the electromagnetic valve 223. Alternatively, the rod-shaped member 224 may be configured to have a function of switching the extension and contraction based on an external signal, using an element such as a piezoelectric element.

[0044] According to the third embodiment described above, in addition to providing the same effects as those of the first or second embodiment, when the atmosphere release plate 201 is in an open state, if a signal for causing the solenoid valve 223 to be in an excited state is received from the outside by a receiving unit (not shown), the solenoid valve 223 is switched to an excited state. Thereafter, the solenoid valve 223 that has been switched to an excited state extends the rod-shaped member 224, and the extension of the rod-shaped member 224 applies a force to the rail 225 that exceeds at least the frictional force generated in the internal structure of the shaft portion of the opening / closing mechanism 211, thereby closing the atmosphere release plate 201. As a result, the open state of the atmosphere release plate 201 can be changed to a closed state by remote control, so that an event that the atmosphere release plate cannot be restored when access is impossible due to snow accumulation or the like as in the conventional case does not occur, and it is possible to prevent the power plant from being shut down due to the inability to perform restoration work.

[0045] Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, and are included in the scope of the invention and its equivalents described in the claims. [Explanation of symbols]

[0046] 100...geothermal power generation system, 101...steam piping, 102...steam turbine, 103...generator, 104...condenser, 105...condensate piping, 106...moving blade, 107...exhaust chamber, 108...main shaft, 109...atmospheric exhaust port, 110...vacuum pump, 111...pressure gauge, 200...atmospheric exhaust device, 201...atmospheric exhaust plate, 202...opening / closing mechanism, 203...sealing mechanism, 203a...gasket, 203b...O-ring, 204...mounting portion, 205...first reference surface, 211...opening / closing mechanism, 212...second reference surface, 221...plate-shaped member, 222...identification device, 222a...limit switch, 222b...limit switch pressing plate, 223...solenoid valve, 224...rod-shaped member, 225...rail

Claims

1. an atmosphere release plate capable of releasing steam inside the steam turbine or the condenser to the atmosphere from an atmosphere release port of the steam turbine or the condenser; an opening / closing mechanism that is directly or indirectly provided in the atmosphere vent port and is attached to the atmosphere vent plate, and that enables the atmosphere vent plate to be repeatedly opened and closed; a sealing mechanism provided at the atmosphere vent port, wherein when the atmosphere vent plate is in a closed state, a downstream end surface of the sealing mechanism is located on a first reference plane which is a position in the closed state, and presses the atmosphere vent port and the atmosphere vent plate, and when the atmosphere vent plate is in an open state, the downstream end surface is located downstream of the first reference plane; An atmosphere discharge device comprising:

2. 2. The atmosphere relief device according to claim 1, wherein the opening and closing mechanism is capable of maintaining an opening degree of the atmosphere relief plate in the open state.

3. 3. The atmosphere relief device according to claim 2, further comprising a rod-shaped member that is provided at a position facing the atmosphere relief plate in the open state and is extendable toward the atmosphere relief plate to close the atmosphere relief plate in the open state.

4. 4. The atmosphere relief device according to claim 3, further comprising an electromagnetic valve connected to said rod-shaped member for controlling said extension and contraction of said rod-shaped member.

5. a plate-like member that is disposed directly or indirectly at the atmosphere vent port and extends so as to face the atmosphere vent plate at least in the open state; 5. The atmosphere relief device according to claim 4, wherein the rod-shaped member and the solenoid valve are attached in a longitudinal direction of the plate-shaped member.

6. 6. The atmosphere release device according to claim 3, further comprising an identification device provided at the atmosphere release port for making it possible to distinguish between the open state and the closed state.

7. a steam turbine that converts thermal energy of the steam separated from the geothermal fluid into rotational energy; a condenser for condensing the steam guided from the steam turbine; an atmosphere release device according to claim 1 , which is capable of releasing steam inside the steam turbine or the condenser to the atmosphere from an atmosphere release port located in the steam turbine or the condenser; A geothermal power generation system comprising:

Images