JP2022130858A - Condenser and geothermal power plant and operation method of condenser - Google Patents

Abstract

To provide a condenser which is less likely to overturn and enables reduction of the weight, and to provide a geothermal power plant and an operation method of the condenser.SOLUTION: Steam discharged from an axial flow turbine, which is rotationally driven around a rotation axis R extending in a predetermined direction by steam jetted from a geothermal well, is supplied to a condenser 10 through a steam duct 31. The condenser 10 includes: a body part 10a in which an outer shape of a cross section cut on a horizontal surface is circular and which is connected with the steam duct 31 and supplied with the steam discharged from the axial flow turbine through the steam duct 31 and cools the steam therein to condense the steam; and fixing parts 10b which fix the body part 10a.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to condensers and geothermal power plants and methods of operating condensers.

2. Description of the Related Art In a geothermal power plant, steam separated from a geothermal fluid (mainly a mixed fluid of steam and hot water) emitted from a well is introduced into a steam turbine to generate power. Also, the steam that has finished work in the steam turbine is directed to a condenser. The steam led to the condenser is condensed by heat exchange with cooling water. 2. Description of the Related Art As a steam turbine and a condenser provided in a power plant, for example, those described in Patent Document 1 are known.

Patent Literature 1 describes a condenser having a condenser shell and an intermediate shell. The condenser shell and the intermediate shell are arranged parallel to the turbine rotating shaft direction along the turbine rotating shaft direction. A steam turbine mounted on a foundation is connected to the turbine connection opening of the intermediate shell. The condenser shell also condenses turbine exhaust admitted from the steam turbine. The condenser shell has a rectangular cross section when cut along a horizontal plane.

JP 2016-223309 A

Generally, in a geothermal power plant, the outer shape of a condenser is selected according to the direction of exhaust from a steam turbine. 1, a condenser having a square cross section when cut along a horizontal plane (hereinafter referred to as a "square condenser") was selected.

During the operation of the axial flow turbine, a horizontal tensile stress (vacuum load) acts on the connecting portion with the steam turbine due to the influence of the vacuum load caused by the rotational drive. For this reason, since an overturning moment is generated in the entire condenser, a rectangular condenser having a structure and strong reinforcement that can withstand this overturning moment has been adopted.

However, since the square condenser has a sturdy structure, it weighs about twice as much as a round condenser (a condenser that has a circular cross section when cut on a horizontal plane). There was a problem that costs such as manufacturing cost, material cost, transportation cost, and installation construction cost at the site increased. On the other hand, round condensers require less reinforcement against vacuum during operation than square condensers, so they have the advantage of being able to reduce weight. There was a problem that it is easy to fall down when it acts. Therefore, it was difficult to connect the round condenser to the axial flow turbine.

The present disclosure has been made in view of such circumstances, and an object of the present disclosure is to provide a condenser and a geothermal power plant that can be made lighter, and a method of operating the condenser.
Another object of the present invention is to provide a condenser and a geothermal power plant that are less likely to tip over, and a method of operating the condenser.

In order to solve the above problems, the condenser, geothermal power plant, and condenser operating method of the present disclosure employ the following means.
In the condenser according to one aspect of the present disclosure, the steam discharged from an axial flow turbine driven to rotate about a rotation axis extending in a predetermined direction by steam ejected from a geothermal well is supplied through a steam duct. a condenser having a circular cross section when cut along a horizontal plane, to which the steam duct is connected, and the steam discharged from the axial flow turbine is supplied through the steam duct , a body portion for cooling the steam therein to condense the steam; and a fixing portion for fixing the body portion.

A method for operating a condenser according to an aspect of the present disclosure is such that the steam discharged from an axial flow turbine driven to rotate about a rotation axis extending in a predetermined direction by steam ejected from a geothermal well passes through a steam duct. wherein the condenser has a circular cross-sectional shape when cut along a horizontal plane, the steam duct is connected, and the steam duct is connected to the a main body to which the steam discharged from the axial flow turbine is supplied; and a fixing part for fixing the main body, wherein the steam is cooled inside the main body to condense the steam. Prepare.

According to the present disclosure, the weight of the condenser can be reduced. In addition, the condenser can be made difficult to overturn.

1 is a diagram showing a schematic configuration of a geothermal power plant according to an embodiment of the present disclosure; FIG. 1 is a diagram showing a schematic configuration of a condensate system according to an embodiment of the present disclosure; FIG. 1 is a schematic front view of a steam turbine and condenser according to an embodiment of the present disclosure; FIG. 1 is a schematic perspective view of a condenser and gas cooler according to an embodiment of the present disclosure; FIG. 1 is a cross-sectional view of a condenser according to an embodiment of the present disclosure; FIG. It is the figure which looked at the reinforcement leg of FIG. 5 from the arrow B direction.

Embodiments of a condenser, a geothermal power plant, and a condenser operating method according to the present disclosure will be described below with reference to the drawings. Note that the condenser 10 can be widely applied to any geothermal power plant 1 that generates power using the geothermal fluid blown from the well 2, and is applicable only to the geothermal power plant 1 having the configuration described below. It is not limited.

FIG. 1 is a diagram showing a schematic configuration of a geothermal power plant 1 according to the first embodiment of the present disclosure. In the present embodiment, one well 2 and one return well 3 are provided, but a plurality of wells 2 and 3 may be provided. The geothermal power plant 1 shown in FIG. 1 is a flash cycle type geothermal power plant, but the condenser 10 can be similarly applied to geothermal power plants having other configurations such as a binary cycle type. It is possible. In addition, the condenser 10 can be applied not only to geothermal power plants, but also to heat utilization of high-temperature fluid containing sulfur sulfide such as geothermal steam.

As shown in FIG. 1, the geothermal power plant 1 according to the present embodiment includes a geothermal fluid transport pipe (gas-liquid two-phase fluid transport pipe) 5 and a fumarole flow rate control valve (hereinafter simply referred to as a "flow rate control valve") 4. , a steam separator (hereinafter referred to as "separator 6") 6, a hot water pipe 7, a steam pipe 8, a steam turbine (axial flow turbine) 9, and a condensate system 20 as main components. there is

The geothermal fluid transport pipe 5 is a pipe that guides the geothermal fluid ejected from the well (geothermal well, production well) 2 to the separator 6 . A magma reservoir is formed in the basement of the well 2, and rainwater that permeates underground, groundwater that flows in, and the like are heated by the heat of the magma reservoir, forming a geothermal reservoir. A geothermal fluid is stored in the geothermal reservoir and is drawn to the surface by a well 2 . A geothermal fluid transport pipe 5 transports geothermal fluid from the geothermal reservoir through the well 2 to the separator 6 . A geothermal fluid is a gas-liquid two-phase mixed fluid mainly composed of steam and hot water.

A flow control valve (fumarolic flow rate control valve) 4 is provided on the geothermal fluid transport pipe 5, and the total flow rate of the geothermal fluid flowing from the well 2 into the separator 6 (fumarolic flow rate, total flow rate of steam and hot water). are adjusting. The wellhead pressure of the well 2 can also be adjusted by adjusting the flow control valve 4 .

In addition, an on-off valve (not shown) is provided on the upstream side of the geothermal fluid flow on the geothermal fluid transport pipe 5 (near the well 2 exit) to control the conduction state (conduction state or non-conduction state) of the geothermal fluid. may be

The separator 6 is a device that separates the geothermal fluid, which is a gas-liquid two-phase mixed fluid supplied from the geothermal fluid transport pipe 5, into steam and hot water. The hot water separated by the separator 6 is led to the hot water pipe 7 and the steam separated by the separator 6 is led to the steam pipe 8 .

The hot water pipe 7 is a pipe that guides the hot water separated by the separator 6 to the reinjection well 3 . By returning the hot water to the underground geothermal reservoir via the return well 3, depletion of the geothermal fluid in the underground geothermal reservoir is suppressed. The hot water separated by the separator 6 is pressure-fed to the reinjection well 3 via a hot water pipe 7 such as a pump (not shown). A plurality of return wells 3 may be provided.

The steam pipe 8 is a pipe that guides the steam separated by the separator 6 to the steam turbine 9 . When a plurality of separators 6 are provided, steam separated by each separator 6 joins in a steam pipe 8 and is supplied to a steam turbine 9 .

The steam turbine 9 is rotationally driven by the geothermal fluid ejected from the well 2 performing work on the turbine blades. Specifically, the energy of the steam separated from the hot water by the separator 6 and supplied through the steam pipe 8 causes the turbine blades (not shown) to rotate about a rotation axis (not shown), thereby rotating the turbine blades. A generator (not shown) connected to and connected to is rotationally driven to generate power.

The condensate system 20 is a system for condensing steam that has finished work in the steam turbine 9 . FIG. 2 is a diagram showing a schematic configuration of the condensate system 20. As shown in FIG. As shown in FIG. 2, it is provided with a condenser 10, a cooling tower 16, a gas cooler (gas cooler) 11, an inter-condenser (middle-stage cooler) 13, and an after-condenser (post-stage cooler) 15. . Note that the gas cooler 11 may be configured integrally as a part of the condenser 10 . The condenser 10, gas cooler 11, inter-condenser 13, and after-condenser 15 serve as heat exchangers.

In FIG. 2, the system through which the cooling water flows is the cooling water system. Since cooling water is used in the condensate system 20, the system through which the cooling water flows in the condensate system 20 is the cooling water system. More specifically, the condenser 10, the cooling tower 16, the gas cooler 11, the inter-condenser 13, the after-condenser 15, the circulation system 17, the supply system 18 (other pipes through which cooling water flows, etc. ) constitutes the cooling water system. In this embodiment, the cooling water system has the configuration shown in FIG. 2, but the configuration of the cooling water system is not limited to that shown in FIG. 2, and the system through which the cooling water flows is the cooling water system.

The condenser 10 condenses the steam discharged from the steam turbine 9 by bringing it into contact with cooling water. Specifically, the condenser 10 sprays cooling water on the steam (turbine exhaust steam) that has completed the work of rotating the turbine blades (not shown) in the steam turbine 9 to cool and condense the steam. It is a device for condensing water. That is, the condenser 10 is of the direct contact type. Since the steam discharged from the steam turbine 9 contains non-condensable gases (carbon dioxide, hydrogen sulfide, etc.), the fluid discharged from the steam turbine 9 will be referred to as "gas" or "steam (Gas)” and explain. The condensed water is supplied to the cooling tower 16 via the circulation system 17 by the condensate pump 19 . Also, steam (gas) containing non-condensable gas that has not been condensed is supplied to the gas cooler 11 .

The cooling tower 16 is a device that evaporatively cools the water condensed in the condenser 10 . Specifically, the water supplied to the cooling tower 16 is sprayed from the top of the cooling tower 16 . A part of the sprayed water evaporates by coming into contact with the air circulated by the blower 21 of the cooling tower 16, and the rest of the water is cooled by the latent heat associated with this evaporation. The cooled water is stored in the water tank of the cooling tower 16 as cooling tower water. The cooling tower water stored in the water tank is supplied to the condenser 10 as cooling water via the supply system 18 . The supply system 18 is also connected to the gas cooler 11, the inter-condenser 13, and the after-condenser 15, and supplies cooling water to each device.

A gas cooler (or other device) 11 is provided downstream in the gas flow with respect to the condenser 10 . A supply system 18 for supplying cooling water is connected to the upper portion of the gas cooler 11 . Then, in the gas cooler 11, cooling water is used to cool and condense the gas. The gas cooler 11 is of a tray type as shown in FIG. FIG. 2 shows a structure of three trays (upper tray, middle tray, and lower tray) as an example of a tray type, but the number of trays should be at least one, and the number of trays is not limited to three. do not have. It is also possible to apply gas coolers 11 having other configurations such as a packed bed type. In the gas cooler 11, cooling water is supplied from the upper part of the housing of the gas cooler 11, and the cooling water accumulates in the upper tray (first tray) T1 (liquid phase). Then, the cooling water is dispersed like rain and falls from the plurality of holes provided in the upper tray T1 to the lower side of the upper tray T1. The cooling water that has dropped is accumulated in the middle tray (second tray) T2, and the cooling water is dispersed and falls from a plurality of holes provided in the middle tray T2 in the same manner as the upper tray T1. The cooling water that has dropped is collected in the lower tray (third tray) T3, and like the upper tray T1 and the middle tray T2, the cooling water is dispersed and dropped from the plurality of holes provided in the tray T3.

In this way, the cooling water falling inside the gas cooler 11 contacts the gas, and the gas is cooled. Cooling water and water generated by condensation are accumulated in the lower part of the gas cooler 11 and supplied to the cooling tower 16 through the circulation system 17 .

The intercondenser 13 is provided on the downstream side of the gas flow with respect to the gas cooler 11 . Gas discharged from the gas cooler 11 is pumped to the intercondenser 13 by the ejector 12 . As shown in FIG. 1, steam is partially supplied to the ejector 12 through a pipe branched from the steam pipe 8, and the steam is used to pump gas. In the inter-condenser 13, cooling water is sprayed from the upper part, and the gas is cooled by coming into contact with the gas. Cooling water and water generated by condensation of steam accumulate in the lower portion of the intercondenser 13 and are discharged from the intercondenser 13 as drain. The drain discharged from the intercondenser 13 may be supplied to the cooling tower 16 through the circulation system 17 . The gas is discharged from the inter-condenser 13 to an after-condenser 15 which will be described later.

The after-condenser 15 is provided downstream of the inter-condenser 13 in the gas flow. Gas discharged from the inter-condenser 13 is pressure-fed to the after-condenser 15 by the ejector 14 . As shown in FIG. 1, steam is partially supplied to the ejector 14 through a pipe branched from the steam pipe 8, and the steam is used to pump the gas. In the after-condenser 15, cooling water is sprayed from the upper part and contacts with the gas to cool the gas. Cooling water and water produced by condensation of steam and gas accumulate in the lower part of the after condenser 15 and are discharged from the after condenser 15 as drain. The drain discharged from the after-condenser 15 may be supplied to the cooling tower 16 through the circulation system 17 . The gas is discharged from the after-condenser 15 to the atmosphere. Note that the ejector 14 may be replaced with, for example, a water ring vacuum pump, in which case the after-condenser 15 serves as a seal water separator.

The gas discharged from the after-condenser 15 has a high proportion of non-condensable gas components because water vapor has been removed by each device. The gas discharged from the after-condenser 15 may be released to the atmosphere together with the air used for cooling in the cooling tower 16, or may be subjected to other treatments.

Next, details of the steam turbine 9, the condenser 10 and the gas cooler 11 will be described with reference to FIGS. 3 to 6. FIG.

As shown in FIG. 3 , the steam turbine 9 is provided on a foundation 30 formed on the ground 100 . The steam turbine 9 is rotationally driven around a rotational axis R extending in a predetermined direction by steam (gas) ejected from a geothermal well. The steam turbine 9 discharges steam so as to flow parallel to the rotation axis R. The steam turbine 9 is a so-called axial turbine.

An upstream end of a steam duct 31 is connected to the downstream side of the steam turbine 9 . Steam (gas) discharged from the steam turbine 9 flows inside the steam duct 31 . As shown in FIGS. 3 and 4, the steam duct 31 is a duct having a substantially circular cross section. The steam duct 31 extends linearly along the rotation axis R. That is, the steam duct 31 is arranged so that the central axis of the steam duct 31 is coaxial with the rotation axis R.
As shown in FIG. 4, an atmosphere release plate 32 (safety valve) is provided in the middle of the steam duct 31 . By opening the atmosphere release plate 32 when the pressure inside the steam duct 31 rises excessively, the pressure inside can be reduced.
A downstream end of the steam duct 31 is connected to the main body 10 a of the condenser 10 . Specifically, a duct opening (not shown) is formed in the lower portion of the downstream end of the steam duct 31, and this duct opening is formed in the upper end of the main body portion 10a of the condenser 10. It is connected with an opening (not shown).

Steam (gas) discharged from the steam turbine 9 flows through the steam duct 31 along the rotation axis R as indicated by an arrow G1 in FIG. The steam (gas) that has flowed through the steam duct 31 changes its flow direction downward as indicated by an arrow G2, passes through the duct opening and the condenser opening, and flows into the condenser 10 from above. . Thus, steam (gas) discharged from the steam turbine 9 is supplied to the condenser 10 via the steam duct 31 .

As shown in FIG. 3 , the condenser 10 is erected on the ground 100 . As shown in FIG. 4, the condenser 10 includes a body portion 10a that cools the steam (gas) inside to condense the steam (gas), and a plurality of fixing legs that fix the body portion 10a to the ground 100 ( fixed portion) 10b.

As shown in FIG. 5, the main body portion 10a has a circular cross section when cut along a horizontal plane. As shown in FIGS. 3 and 4, the body portion 10a is a cylindrical member having a central axis C extending in the vertical direction. A space is formed inside the body portion 10a. As shown in FIG. 2, the main body 10a sprays cooling water on steam (gas) inside. This cools and condenses the steam (gas) to produce condensate. As described above, the condenser 10 according to the present embodiment is a so-called round condenser in which the body portion 10a that generates condensate water has a circular cross section when cut along a horizontal plane.
Three ribs 10c projecting from the outer peripheral surface of the body portion 10a are provided on the outer peripheral surface. Each rib 10c is provided over substantially the entire circumferential area. The three ribs 10c are arranged side by side at substantially intervals in the vertical direction. Each rib 10c reinforces the body portion 10a.

A steam duct 31 is connected to the upper end of the main body 10a. As shown in FIG. 5, the main body 10a and the steam duct 31 are arranged such that the central axis (that is, the rotation axis R) of the main body 10a overlaps the central point P of the main body 10a. are placed in Further, as shown in FIG. 4, a notch is formed in the upper end of the body portion 10a so as to be recessed downward from the upper end. A steam duct 31 is fitted in this notch. The body portion 10a and the steam duct 31 are fixed by welding or the like so that there is no gap between them.

As shown in FIG. 4, two supply systems 18 are connected to the upper side surface of the main body 10a. As shown in FIG. 2, the supply system 18 supplies cooling water to the main body 10a. Further, as shown in FIG. 4, two circulation systems 17 are connected to the lower side surface of the main body portion 10a. As shown in FIG. 2 , the circulation system 17 guides the condensate produced in the main body 10 a to the cooling tower 16 . A non-condensable gas duct (connecting portion) 33 is connected to the lower side surface of the main body portion 10a. Specifically, the non-condensable gas duct 33 is connected to the side of the main body 10a opposite to the side on which the steam turbine 9 is present. In addition, the non-condensable gas duct 33 is arranged such that its central axis is coaxial with the central axis of the steam duct 31 (that is, the rotation axis R) when the main body 10a is viewed from above. A non-condensable gas duct 33 connects the condenser 10 and the gas cooler 11 . The non-condensable gas duct 33 guides steam (gas) that has not condensed in the condenser 10 to the gas cooler 11 .

As shown in FIGS. 4 and 5, the fixing leg 10b is provided below the outer peripheral surface of the body portion 10a. A plurality of (in this embodiment, ten as an example) fixing legs 10b are arranged side by side along the circumferential direction. The plurality of fixed legs 10b are arranged at uneven intervals. Further, the plurality of fixed legs 10b are arranged symmetrically with respect to the rotation axis R as shown in FIG. Moreover, the plurality of fixed legs 10b are arranged symmetrically with the intersection line L as a reference. The intersection line L is an imaginary line that passes through the center point P and is perpendicular to the rotation axis R.

The plurality of fixed legs 10b are composed of a rotation axis side fixed leg (rotation axis side fixed portion) 10bA closest to the rotation axis R and an intersection line side fixed leg (crossed line side fixed portion) 10bB closest to the intersection line L. and an intermediate fixed leg (intermediate fixed portion) 10bC provided between the rotation axis side fixed leg 10bA and the intersection line side fixed leg 10bB. In the present embodiment, the intersection line side fixing leg 10bB is provided so as to overlap the intersection line L, as an example. Of the fixed legs 10b, the intermediate fixed leg 10bC is arranged closer to the rotation axis side fixed leg 10bA than the intersection line side fixed leg 10bB. That is, the circumferential distance between the intermediate fixed leg 10bC and the rotation axis side fixed leg 10bA is shorter than the circumferential distance between the intermediate fixed leg 10bC and the intersection line side fixed leg 10bB. In other words, in the region on the side of the rotation axis R (the region closer to the rotation axis R than the intersection line L), the interval at which the fixed legs 10b are provided is short. It should be noted that it is preferable to provide a plurality of fixed legs 10b so as not to interfere with the circulation system 17, the gas cooler 11, and other components arranged on the outer peripheral surface of the condenser 10. , and the rotation axis side fixed leg 10bA may be provided on the rotation axis R as well.

Since each fixed leg 10b has the same structure, one fixed leg 10b will be described below as a representative.
As shown in FIGS. 4 and 6, the fixing leg 10b includes two vertical plate portions 10ba extending in the vertical direction, a bottom portion 10bb connecting the lower ends of the two vertical plate portions 10ba, and two and an upper surface portion 10bc that connects the upper ends of the vertical plate portions 10ba.

The two vertical plate portions 10ba are arranged with a predetermined distance in the circumferential direction of the condenser 10 . Each vertical plate portion 10ba is a plate-shaped member protruding radially outward from the outer peripheral surface of the main body portion 10a. Each vertical plate portion 10ba is arranged such that the plate surface thereof is a vertical surface. The inner end of each vertical plate portion 10ba is fixed to the outer peripheral surface of the body portion 10a. As shown in FIG. 6, each vertical plate portion 10ba has a trapezoidal shape in which the radial length of the upper edge is shorter than the radial length of the lower edge when viewed from the side. The lower end of each vertical plate portion 10ba is fixed to the upper surface of the bottom surface portion 10bb. The upper end of each vertical plate portion 10ba is fixed to the lower surface of the upper surface portion 10bc.

The bottom surface portion 10bb is a plate-like member protruding radially outward from the outer peripheral surface of the main body portion 10a. The bottom surface portion 10bb is arranged so that the plate surface thereof is a horizontal surface. The bottom surface portion 10bb is arranged so that the bottom surface is in contact with the ground 100 . The bottom portion 10bb is fixed to the ground 100 by a plurality of bolts (not shown) penetrating vertically.

The upper surface portion 10bc is a plate-like member protruding radially outward from the outer peripheral surface of the main body portion 10a. The upper surface portion 10bc is arranged so that the plate surface thereof is a horizontal surface.

As shown in FIG. 4, the gas cooler 11 is arranged and fixed on the opposite side of the steam turbine 9 across the condenser 10 . That is, the gas cooler 11 is provided radially outside the condenser 10 .

A non-condensable gas duct 33 is connected to the side of the gas cooler 11 facing the condenser 10 . The non-condensable gas duct 33 is arranged and fixed on the opposite side of the steam turbine 9 across the condenser 10 . The gas cooler 11 has a circular cross section when cut along a horizontal plane. The gas cooler 11 is a cylindrical member whose central axis extends along the vertical direction. The upper end of gas cooler 11 is closed by ceiling surface portion 11b. A closed space is formed inside the gas cooler 11 . A rib 11c is provided on the upper surface of the ceiling surface portion 11b. The rib 11c is erected on the upper surface of the ceiling surface portion 11b. The ribs 11c are plate-like ribs arranged in a grid. The rib 11c reinforces the ceiling surface portion 11b. Since the gas cooler 11 or the non-condensable gas duct 33 is arranged radially outward of the condenser 10, the weight of the gas cooler 11 or the non-condensable gas duct 33 makes it difficult for the main body 10a to overturn. In addition, since the gas cooler 11 or the non-condensable gas duct 33 is arranged and fixed on the opposite side of the steam turbine 9 across the condenser 10, overturning can be prevented more effectively.

An outer peripheral surface of the gas cooler 11 is provided with two ribs 11a projecting from the outer peripheral surface. Each rib 11a is provided over substantially the entire area in the circumferential direction. The two ribs 11a are arranged side by side at a predetermined interval in the vertical direction. Each rib 11 a reinforces the gas cooler 11 .

A gas pipe 35 is connected to the upper side surface of the gas cooler 11 . As shown in FIG. 2 , steam (gas) that has not been condensed in the gas cooler 11 is guided to the ejector 12 by the gas pipe 35 . A supply system 18 is connected to the ceiling surface portion 11 b of the gas cooler 11 . As shown in FIG. 2 , cooling water is supplied to the gas cooler 11 by the supply system 18 .

According to this embodiment, the following effects are obtained.
Hereinafter, a condenser having a main body portion 10a with a circular outer shape in horizontal cross section is referred to as a "round condenser". Further, a condenser having a main body portion having a rectangular outer shape in horizontal cross section is referred to as a "square condenser".

In this embodiment, the condenser 10 is a round condenser. As a result, the strength of the main body portion 10a against the internal and external pressure difference can be improved, for example, as compared with the case where a square condenser is employed as the condenser 10 . Therefore, it is possible to reduce the weight of the main body 10a to the extent that it is not necessary to provide a structure (for example, an increase in plate thickness or a reinforcing member) for improving the strength against the internal and external pressure difference. Moreover, the manufacturing cost of the main body portion 10a can be reduced. As a result, the weight of the condenser can be reduced, and the manufacturing cost of the condenser and the installation cost of the geothermal power plant 1 can be reduced.

Further, when the steam turbine 9, which is an axial turbine, is rotationally driven, a tensile load (see arrow A1 in FIG. 3) acts on the steam duct 31 due to the vacuum load generated due to the rotational driving of the steam turbine 9. . Therefore, a tensile load acts through the steam duct 31 also on the body portion 10a to which the steam duct 31 is connected. Due to this tensile load, an overturning moment (see arrow A2 in FIG. 3) acts on the main body 10a. 10a can be made difficult to fall.

As described above, in general, round condensers tend to overturn due to overturning moment when connected to an axial flow turbine because of their light weight. Since the condenser 10, which is a water container, is fixed to the ground 100 by the fixing legs 10b, even when connected to the steam turbine 9, which is an axial flow turbine, the condenser 10 can be prevented from overturning. can. In this way, in the present embodiment, by providing a structure that suppresses overturning of the condenser 10, a round condenser can be adopted as the condenser 10 connected to the steam turbine 9, which is an axial turbine. It is possible to reduce the weight and manufacturing cost of the condenser 10 . As a result, the installation cost of the geothermal power plant 1 can be reduced.

Further, in this embodiment, the plurality of fixed legs 10b are arranged side by side along the circumferential direction on the outer peripheral surface of the main body portion 10a, and are arranged symmetrically with the rotation axis R as a reference. Thereby, the load acting on each fixed leg 10b is made uniform. Therefore, since local concentration of load can be suppressed, the body portion 10a can be fixed more firmly.

Further, in this embodiment, the intermediate fixed leg 10bC is arranged closer to the rotation axis side fixed leg 10bA than the intersection line side fixed leg 10bB. That is, in the area on the rotation axis R side (area closer to the rotation axis R than the intersection line L), the interval at which the fixed legs 10b are provided is shortened. As a result, the number of fixed legs 10b increases in the vicinity of the rotation axis R where a large overturning moment acts. Therefore, the body portion 10a can be fixed more firmly.

Further, in the present embodiment, the non-condensable gas duct 33 connects the main body 10a to the gas cooler 11 provided radially outside the main body 10a. As a result, the weight of the gas cooler 11 can make it difficult for the main body 10a to overturn.

It should be noted that the present disclosure is not limited to the inventions according to the above-described embodiments, and modifications can be made as appropriate without departing from the scope of the present disclosure.

For example, in the above embodiment, the steam duct 31 is connected to the upper end of the condenser 10a to supply steam from above to the main body 10a of the condenser 10, but the present disclosure is not limited to this. For example, the steam duct 31 may be connected to the side of the main body 10a to supply steam to the main body 10a of the condenser 10 from the side.

Further, for example, in the above-described embodiment, an example in which the main body portion 10a has a circular outer shape in cross section when cut along a horizontal plane has been described, but the present disclosure is not limited to this. For example, the body portion 10a may have a cross-sectional shape such as an ellipse, an oval, or a rectangle when cut along a horizontal plane.

Further, for example, in the above embodiment, the number of fixed legs 10b is ten, but the present disclosure is not limited to this. For example, the number may be 9 or less, or 11 or more. In order to fix the condenser 10, which is a round condenser, the condenser 10 can be preferably fixed to the ground 100 by providing eight or more fixing legs 10b.

The condenser, the geothermal power plant, and the method of operating the condenser according to the embodiments described above are grasped, for example, as follows.
A condenser according to one aspect of the present disclosure is discharged from an axial turbine (9) driven to rotate about a rotation axis (R) extending in a predetermined direction by steam ejected from a geothermal well (2). A condenser (10) to which the steam is supplied through a steam duct (31), wherein the cross section of the condenser (10) when cut along a horizontal plane has a circular outer shape, the steam duct (31) is connected to the condenser (10), and the The steam discharged from the axial flow turbine (9) is supplied through a steam duct (31), and a main body (10a) for cooling the steam therein to condense the steam; and a fixing portion (10b) for fixing 10a).

In the above configuration, the cross section of the main body section taken along a horizontal plane (hereinafter referred to as "horizontal cross section") has a circular outer shape. As a result, the strength of the main body against the internal and external pressure difference can be improved, for example, compared to the case where the outer shape of the horizontal cross section is rectangular. Therefore, it is not necessary to provide a structure (for example, increasing the plate thickness or reinforcing material) for improving the strength against the internal and external pressure difference, so that the weight of the main body can be reduced. Moreover, the manufacturing cost of the main body can be reduced. As a result, the weight of the condenser can be reduced, and the manufacturing cost of the condenser can be reduced.
When the axial turbine is rotationally driven, a tensile load acts on the steam duct due to the vacuum load generated due to the rotational driving of the axial turbine. Therefore, a tensile load is also applied to the main body to which the steam duct is connected via the steam duct. This tensile load causes an overturning moment to act on the main body, but in the above configuration, the main body is fixed by the fixing portion, so that the main body can be prevented from overturning.
As described above, the main body, which has a circular horizontal cross-section, is light in weight and easily overturns due to overturning moment when connected to the axial flow turbine. Since the main body is fixed, it is possible to prevent the main body from overturning even when it is connected to the axial flow turbine. In this way, in the above configuration, by making the main body difficult to overturn, it is possible to adopt a main body having a circular horizontal cross section as the condenser connected to the axial flow turbine, thereby reducing the weight of the condenser. Manufacturing costs can be reduced.
An axial flow turbine is a device in which steam that flows in a direction parallel to the axis of rotation collides with the blades of the turbine, transmits the energy of the steam to a rotating body, and is discharged in a direction parallel to the axis.

Further, in the condenser according to the aspect of the present disclosure, the fixing portion (10b) fixes the main body portion to the ground.
With the above configuration, the main body can be fixed to the ground. As a result, the main body can be firmly fixed, and the main body can be made more difficult to fall over.

Further, in the condenser according to an aspect of the present disclosure, a plurality of the fixing portions (10b) are provided, and the main body portion (10a) is arranged on the center point (P) of the rotation axis when viewed from above. (R) overlap, and the plurality of fixing portions (10b) are arranged along the circumferential direction on the outer peripheral surface of the main body portion (10a), with the rotation axis (R) as a reference arranged symmetrically.

In the above configuration, the plurality of fixing portions are arranged side by side along the circumferential direction on the outer peripheral surface of the main body portion, and are arranged symmetrically with respect to the rotation axis. As a result, the load acting on each fixed portion is made uniform. Therefore, since local concentration of load can be suppressed, the main body can be fixed more firmly.
The rotation axis includes both the rotation axis included in the axial turbine and a line extending the rotation axis included in the axial turbine.

Further, in the condenser according to an aspect of the present disclosure, a plurality of the fixing portions (10b) are provided, and the main body portion (10a) is arranged on the center point (P) of the rotation axis when viewed from above. (R) overlap, and the plurality of fixing portions (10b) are provided along the circumferential direction on the outer peripheral surface of the main body (10a) and are closest to the rotation axis (R). an axis side fixing part (10bA), an intersection line side fixing part (10bB) closest to an intersection line (L) orthogonal to the rotation axis (R), the rotation axis side fixing part (10bA) and the intersection line side and an intermediate fixing portion (10bC) provided between the fixing portion (10bB), wherein the intermediate fixing portion (10bC) is closer to the rotation axis side fixing portion (10bB) than the intersection line side fixing portion (10bB). 10bA).

In the above configuration, the intermediate fixing portion is arranged closer to the rotation axis side fixing portion than the intersection line side fixing portion. That is, in the region on the rotation axis side (the region closer to the rotation axis than the intersection line), the interval at which the fixing portions are provided is shortened. As a result, the number of fixed parts increases in the vicinity of the rotation axis where a large overturning moment acts. Therefore, the main body can be fixed more firmly.

Further, in the condenser according to one aspect of the present disclosure, another device (11) provided radially outside the main body (10a) is fixed to the main body (10a).

In the above configuration, the other device provided radially outside the main body and the main body are fixed. As a result, it is possible to prevent the main body from overturning due to the weight of other devices.
An example of another device is a gas cooler that cools steam containing non-condensed gas that has not been condensed in the condenser.

Further, in the condenser according to one aspect of the present disclosure, the other device (11) is fixed to the main body (10a) via a connection part (33), and the connection part (33) is connected to the main body and is connected to the side opposite to the axial flow turbine (9).

In the above configuration, another device is connected to the opposite side of the axial flow turbine via the connecting portion. This makes it more difficult for the main body to overturn with respect to the overturning moment exerted by the tensile load from the axial flow turbine.

Further, the geothermal power plant according to one aspect of the present disclosure is connected to the axial turbine (9) rotationally driven by the steam jetted from the geothermal well (2), and the A generator that generates electricity by driving force of an axial turbine (9), and a condenser (10) according to any one of the above that generates condensate by cooling the steam discharged from the axial turbine (9). ), and

In addition, a condenser operating method according to an aspect of the present disclosure includes an axial flow turbine (9 ) is supplied through a steam duct (31), wherein the condenser (10) has a cross-sectional outline when cut along a horizontal plane. is circular, and the steam duct (31) is connected to a main body (10a) to which the steam discharged from the axial flow turbine (9) is supplied via the steam duct (31); and a fixing portion (10b) for fixing the body portion (10a), and the operation of a condenser (10) comprising a step of cooling the steam inside the body portion (10a) to condense the steam. Method.

1: Geothermal power plant 2: Well 3: Reinjection well 4: Flow control valve 5: Geothermal fluid transport pipe 6: Separator 7: Hot water pipe 8: Steam pipe 9: Steam turbine (axial flow turbine)
10: Condenser 10a: Body portion 10b: Fixed leg (fixed portion)
10bA: rotation axis side fixed leg (rotation axis side fixed part)
10bB: Intersection line side fixing leg (intersection line side fixing part)
10bC: intermediate fixed leg (intermediate fixed part)
10ba: vertical plate portion 10bb: bottom portion 10bc: top portion 10c: rib 11: gas cooler (other device)
11a: Rib 11b: Ceiling surface portion 11c: Rib 12: Ejector 13: Inter-condenser 14: Ejector 15: After-condenser 16: Cooling tower 17: Circulation system 18: Supply system 19: Condensate pump 20: Condensate system 21: Blower 30 : Foundation 31 : Steam duct 32 : Air release plate 33 : Non-condensable gas duct 35 : Gas pipe 100 : Ground T1 : Upper tray T2 : Middle tray T3 : Lower tray

Claims (8)

A condenser in which the steam discharged from an axial flow turbine driven to rotate about a rotation axis extending in a predetermined direction by steam ejected from a geothermal well is supplied through a steam duct,
The steam duct is connected to the steam duct, the steam discharged from the axial flow turbine is supplied through the steam duct, and the steam is cooled inside. a main body for condensing the steam with
and a fixing portion that fixes the main body portion. The condenser according to claim 1, wherein the fixing portion fixes the main body portion to the ground. A plurality of the fixing parts are provided,
The main body is arranged so that the rotation axis line overlaps with the central point when viewed from above,
3. The restoration according to claim 1, wherein the plurality of fixing portions are arranged along the circumferential direction on the outer peripheral surface of the main body portion and are arranged symmetrically with respect to the rotation axis. water vessel. A plurality of the fixing parts are provided,
The main body is arranged so that the rotation axis line overlaps with the central point when viewed from above,
The plurality of fixing portions are provided on the outer peripheral surface of the main body along the circumferential direction, and include a rotation axis side fixing portion closest to the rotation axis and an intersection line side closest to the intersection line orthogonal to the rotation axis. a fixing portion; and an intermediate fixing portion provided between the rotation axis side fixing portion and the intersection line side fixing portion;
The condenser according to any one of claims 1 to 3, wherein the intermediate fixing portion is arranged closer to the rotation axis side fixing portion than to the intersection line side fixing portion. The condenser according to any one of claims 1 to 4, wherein another device provided radially outside of the main body is fixed to the main body. The other device is fixed to the main body via a connecting portion,
6. The condenser according to claim 5, wherein the connection portion is connected to the outer peripheral surface of the body portion on the side opposite to the axial flow turbine. the axial flow turbine rotationally driven by the steam ejected from the geothermal well;
a generator connected to the axial turbine and generating power by the driving force of the axial turbine;
7. A geothermal power plant, comprising: the condenser according to any one of claims 1 to 6, which cools the steam discharged from the axial flow turbine to generate condensate. A method for operating a condenser in which the steam discharged from an axial flow turbine rotated about a rotation axis extending in a predetermined direction by steam ejected from a geothermal well is supplied through a steam duct, comprising:
The condenser is
a main body having a circular outer shape when cut along a horizontal plane, to which the steam duct is connected and to which the steam discharged from the axial flow turbine is supplied through the steam duct;
and a fixing portion that fixes the main body portion,
A method of operating a condenser, comprising the step of condensing the steam by cooling the steam inside the main body.

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