Modular casing for low pressure turbine of power plant

Abstract

The present invention relates to a modular casing for a low-pressure turbine of a power plant. The modular casing for a low-pressure turbine of a power plant comprises: an inner casing accommodating a rotor of the low-pressure turbine and extending lengthwise in one direction; and an outer casing accommodating the inner casing, wherein the outer casing comprises: a rectangular module for forming a rectangular parallelepiped-shaped first accommodation space; and a semicircular module for forming a semicylindrical second accommodation space communicating with the first accommodation space, wherein a first through hole corresponding to one end of the inner casing and a second through hole corresponding to the other end of the inner casing are formed in the outer casing.

Description

Modular casing for low-pressure turbines in power plants

[0001] The present invention relates to a modular casing for a low pressure turbine of a power plant.

[0002] The casing (or hood) for the low-pressure turbine of a turbine generator accommodates the rotor of the low-pressure turbine and is connected to the condenser.

[0003] There are two ways to connect the condenser: the side exhaust method, in which the condenser is located on the side of the low-pressure turbine, and the bottom exhaust method, in which the condenser is located at the bottom of the low-pressure turbine.

[0004] In order to shorten the air cycle and reduce costs, the development of a modular low-pressure turbine casing that can support both side exhaust and bottom exhaust methods is required.

[0005] Accordingly, an object of the present invention is to provide a modular casing for a low pressure turbine of a power plant.

[0006] The above object of the present invention is achieved by providing a modular casing for a low-pressure turbine of a power plant, comprising: an inner casing that accommodates a rotor of the low-pressure turbine and extends long in one direction; and an outer casing that accommodates the inner casing, wherein the outer casing includes: a square module for forming a first receiving space in the shape of a rectangular parallelepiped; and a semicircular module for forming a second receiving space in the shape of a semi-cylindrical shape that is in communication with the first receiving space, and wherein the outer casing is formed with a first through-hole corresponding to one end of the inner casing and a second through-hole corresponding to the other end of the inner casing.

[0007] A part of the inner casing may be located in the first receiving space and the rest may be located in the second receiving space, and the first through hole and the second through hole may each be formed in part in the square module and the rest in the semicircular module.

[0008] The above square module includes a first horizontal support plate extending outward from an end portion, and the above semicircular module includes a second horizontal support plate extending outward from an end portion, and the first horizontal support plate and the second horizontal support plate face each other to form a horizontal support plate, and the horizontal support plate can extend horizontally in a lower exhaust manner in which the second receiving space is located above the first receiving space and come into contact with a ground structure.

[0009] The above square module includes a first square module and a second square module, and the first square module and the second square module each include a first vertical support plate extending outward from an end, and the first vertical support plate of the first square module and the first vertical support plate of the second square module face each other to form a side vertical support plate, and the side vertical support plate can extend horizontally in a side exhaust manner in which the second receiving space is located on a side of the first receiving space and come into contact with a ground structure.

[0010] The above semicircular module includes a first semicircular module and a second semicircular module, and the first semicircular module and the second semicircular module each include a second vertical support plate extending outward from an end, and the second vertical support plate of the first semicircular module and the second vertical support plate of the second semicircular module face each other to form an upper vertical support plate, and the upper vertical support plate can extend horizontally in a side exhaust manner in which the second receiving space is located on a side of the first receiving space and additionally come into contact with a ground structure.

[0011] It further includes a support member that is coupled to the inner casing and extends in the longitudinal direction of the inner casing, and the semicircular module has a first receiving portion that protrudes outward, and the first receiving portion receives an end of the support member in a lower exhaust manner in which the second receiving space is located above the first receiving space, and the lower surface of the support member can be supported by contacting the square module.

[0012] The first square module and the second square module are each formed with a second receiving portion that protrudes outward, and the second receiving portion of the first square module and the second receiving portion of the first square module meet each other to form a first support space, and the first support space can receive and support an end of the support in a side exhaust manner located on the side of the first receiving space.

[0013] The first semicircular module and the second semicircular module are each formed with a third receiving portion that protrudes outward, and the third receiving portion of the first semicircular module and the third receiving portion of the second semicircular module meet each other to form a second support space, and the second support space can additionally receive and support an end of the support in a side exhaust manner located on the side of the first receiving space.

[0014] The invention further includes a spiral inlet located inside the inner casing, wherein the spiral inlet may include an inlet portion for receiving steam from a high-pressure turbine; an outlet portion for supplying steam to the rotating body; and a main body for forming a spiral-shaped steam path connecting the inlet portion and the outlet portion.

[0015] The above semicircular module may have an external inlet portion formed therein that is connected to the inlet portion.

[0016] The above object of the present invention can be achieved by providing a modular casing for a low-pressure turbine of a power plant, comprising: an inner casing that accommodates a rotor of the low-pressure turbine and extends long in one direction; and an outer casing that accommodates the inner casing, wherein the outer casing includes: a square module for forming a first receiving space in the shape of a rectangular parallelepiped; and a semicircular module for forming a second receiving space in the shape of a semi-cylinder that is in communication with the first receiving space; wherein, in a bottom exhaust method in which the second receiving space is located above the first receiving space, the square module and the semicircular module form a horizontal support plate that extends horizontally and contacts a ground structure, and in a side exhaust method in which the second receiving space is located on the side of the first receiving space, the square module and the semicircular module form a first vertical support plate and a second vertical support plate that extend horizontally and contact the ground structure, respectively.

[0017] It further includes a support member that is coupled to the inner casing and extends in the longitudinal direction of the inner casing, and the semicircular module can receive an end of the support member in a bottom exhaust method in which the second receiving space is located above the first receiving space, and the square module can receive an end of the support member in a side exhaust method in which the second receiving space is located on the side of the first receiving space.

[0018] According to the present invention, a modular casing for a low pressure turbine of a power plant is provided.

[0019] FIG. 1 illustrates a first arrangement form of an outer casing in a modular casing according to one embodiment of the present invention.

[0020] FIG. 2 illustrates a second arrangement form of the outer casing in a modular casing according to one embodiment of the present invention.

[0021] Figure 3 illustrates a first square module in a modular casing according to one embodiment of the present invention.

[0022] Figure 4 illustrates a first semicircular module in a modular casing according to one embodiment of the present invention.

[0023] FIG. 5 shows the support form of the inner casing in a modular casing according to one embodiment of the present invention.

[0024] FIG. 6 illustrates another support form of the inner casing in a modular casing according to one embodiment of the present invention.

[0025] Figure 7 illustrates a spiral inlet in a modular casing according to one embodiment of the present invention.

[0026] Hereinafter, various embodiments of the present invention will be described in detail with reference to the attached drawings so that those skilled in the art can easily implement the invention. The present invention may be implemented in various different forms and is not limited to the embodiments described herein.

[0027] In order to clearly explain the present invention, parts that are not related to the description are omitted, and the same reference numerals are used for identical or similar components throughout the specification.

[0028] In addition, the size and thickness of each component shown in the drawing are arbitrarily shown for convenience of explanation, so the present invention is not necessarily limited to what is shown.

[0029] The power plant in the present invention may be a nuclear power plant, and in particular, may be a small modular reactor power plant.

[0030] Hereinafter, a modular casing according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7.

[0031] The modular casing (1) includes an outer casing (10), an inner casing (20), a support (30), and a spiral inlet (40).

[0032] The outer casing (10) is composed of a plurality of modules and accommodates the inner casing (20). The rotor of the low-pressure turbine is located inside the inner casing (20). The support (30) is connected to the inner casing (20) and is supported by the outer casing (10), ultimately supporting the inner casing (20). The spiral inlet (40) is located inside the inner casing (20) and changes the direction of steam supplied from the outside and supplies it to the rotor.

[0033] The modular casing (1) according to the present invention can be used in both the side exhaust method in which the condenser is located on the side and the bottom exhaust method in which the condenser is located at the bottom.

[0034] The outer casing (10) will be described below with reference to FIGS. 1 to 4.

[0035] FIG. 1 illustrates a first arrangement form of an outer casing in a modular casing according to an embodiment of the present invention, FIG. 2 illustrates a second arrangement form of an outer casing in a modular casing according to an embodiment of the present invention, FIG. 3 illustrates a first square module in a modular casing according to an embodiment of the present invention, and FIG. 4 illustrates a first semicircular module in a modular casing according to an embodiment of the present invention.

[0036] The first arrangement shown in Fig. 1 is the arrangement of the external casing (10) in the lower exhaust method, and the second arrangement shown in Fig. 2 is the arrangement of the external casing (10) in the side exhaust method.

[0037] The outer casing (10) connected to the condenser includes a square module (110) at the bottom and a semicircular module (120) at the top, as seen in the arrangement of Fig. 1.

[0038] The square module (110) consists of a total of four modules, including a first square module (110a) and a second square module (110b) of symmetrical shape. The remaining two modules have the same shape as the first square module (110a) and the second square module (110b), respectively.

[0039] The square module (110) forms a first receiving space in the shape of a rectangular parallelepiped.

[0040] As shown in Fig. 3, the first square module (110a) has an overall L-shape and includes a first horizontal support plate (111) that is vertically bent outward from the upper end and a first vertical support plate (112) that is vertically bent outward from the side end. In addition, a second receiving portion (113) that protrudes outward and forms a rectangular parallelepiped-shaped space is formed on the side. The second square module (110b) also has the same configuration as the first square module (110a) with only the arrangement being different.

[0041] The second receiving portion (113) has an empty side facing the other module, and when assembled as shown in FIGS. 1 and 2, a pair of adjacent second receiving portions (113) form a first support space in which two rectangular parallelepiped-shaped spaces are connected.

[0042] The semi-circular module (120) forms a second receiving space in a semi-cylindrical shape. In another embodiment, the second receiving space is not limited to a semi-cylindrical shape, and may be any spatial shape in which one cross-section in the vertical direction of the longitudinal direction is straight and the other cross-section is curved. In addition, the term "semi-cylinder" in the present invention includes various types of cut cylinders that are not exactly semi-cylinders.

[0043] The semicircular module (120) consists of a total of four modules, including a first semicircular module (120a) and a second semicircular module (120b) of symmetrical shape. The remaining two modules have the same shape as the first semicircular module (120a) and the second semicircular module (120b), respectively.

[0044] As shown in Fig. 4, the first semicircular module (110a) has an overall curved shape and includes a second vertical support plate (121) that is bent outwardly at the upper end and a second horizontal support plate (122) that is bent outwardly at the side end. In addition, a first receiving portion (123) and a third receiving portion (124) that protrude outward and form a rectangular parallelepiped-shaped space are formed at the side. The second semicircular module (120b) also has the same configuration as the first semicircular module (120a) with only the arrangement being different.

[0045] The third receiving portion (124) has an empty side facing the other module, and when assembled as shown in FIGS. 1 and 2, a pair of adjacent third receiving portions (124) form a second support space in which two rectangular parallelepiped-shaped spaces are connected.

[0046] In the assembled state, the first horizontal support plate (111) of the first square module (110a) and the second horizontal support plate (122) of the first semicircular module (120a) form a horizontal support plate (130) as shown in Fig. 1.

[0047] The horizontal support plate (130) is extended horizontally in a lower exhaust manner as in Fig. 1, i.e., in a configuration where the second receiving space is located above the first receiving space.

[0048] The horizontal support plate (130) is fixed or secured to a ground structure (turbine foundation) in the lower exhaust method to support the modular casing (1). For example, in the lower exhaust method, the lower part of the square module (110) may be buried in the ground made of concrete, and the horizontal support plate (130) may be fixed on a support structure of a rigid structure placed on the concrete ground.

[0049] In addition, a pair of first vertical support plates (112) facing each other in the assembled state form a side vertical support plate (140), and a pair of second vertical support plates (121) facing each other form an upper vertical support plate (150).

[0050] The side vertical support plate (140) and the upper vertical support plate (150) are horizontally extended in a side exhaust manner as shown in FIG. 2, i.e., in an arrangement where the second receiving space is located on the side of the first receiving space.

[0051] The side vertical support plate (140) and the upper vertical support plate (150) are fixed or secured to a ground structure in the side exhaust method to support the modular casing (1). For example, in the side exhaust method, the lower portions of the square module (110) and the semicircular module (120) may be buried in the ground made of concrete, and the side vertical support plate (140) and the upper vertical support plate (150) may be fixed on a support structure of a rigid structure placed on the concrete ground.

[0052] The portion where two square modules (110a, 110b) and two semicircular modules (120a, 120b) meet is cut into a quadrant shape to form a first passage hole (11) and a second passage hole (12) in a circular shape. Each module can be joined in various ways, such as by welding or screwing.

[0053] Although not shown, an external inlet is formed in the part corresponding to A in Fig. 1 to receive steam from a high-pressure turbine.

[0054] The support form of the inner casing is described below with reference to FIGS. 5 and 6.

[0055] FIG. 5 illustrates a support form of an inner casing in a modular casing according to one embodiment of the present invention, and FIG. 6 illustrates another support form of an inner casing in a modular casing according to one embodiment of the present invention.

[0056] The support form shown in Fig. 5 is the support form in the lower exhaust method shown in Fig. 1, and the support form shown in Fig. 6 is the support form in the side exhaust method shown in Fig. 2.

[0057] The inner casing (20) is cylindrical and extends in one direction, housing a rotating body. In other embodiments, the shape of the inner casing (20) is not limited to a cylindrical shape. The two ends of the inner casing (20) are arranged to correspond to the first through hole (11) and the second through hole (12), respectively.

[0058] The support (30) is arranged symmetrically at four locations of the inner casing (20) and is connected to the inner casing (20).

[0059] The support (30) is extended in one direction, and the end is accommodated in the receiving portion (123, 113, 124).

[0060] A closer look at the acceptance form of the support (30) is as follows.

[0061] In the lower exhaust method as shown in Fig. 5, the end of the support (30) is accommodated in the first receiving portion (123), and the lower part of the support (30) is supported by the square module (110). In another embodiment, the lower part of the support (30) may be supported by a horizontal support plate (130).

[0062] In the side exhaust method as shown in Fig. 6, the ends of two of the four supports (30) are accommodated in the first support space formed by the meeting of two second receiving portions (113), and the ends of the remaining two supports (30) are accommodated in the second support space formed by the meeting of two third receiving portions (124).

[0063] The end of the support (30) is stably received and supported by a separate receiving portion, so that the inner casing (20) is stably fixed inside the outer casing (10).

[0064] Inside the inner casing (20), a spiral inlet (40) is located to supply steam supplied from the outside to the rotating body.

[0065] Figure 7 illustrates a spiral inlet in a modular casing according to one embodiment of the present invention.

[0066] The spiral inlet (40) includes an inlet (41), an outlet (42), and a main body (43).

[0067] The inlet (41) receives steam from a high-pressure turbine through an external inlet formed in the outer casing (10), and the outlet (42) supplies steam to the rotating body.

[0068] The main body (43) has a spiral-shaped internal space and changes the direction of steam progression.

[0069] Although not shown, a stiffener can be additionally installed on the outer surface of the outer casing (10).

[0070] The modular casing (1) described above can be formed of metal, and in particular can be made of steel or stainless steel.

[0071] According to the present invention described above, the casing can be modularized, regardless of the exhaust type (downward or side), enabling the design and manufacture of a turbine generator unaffected by the site conditions (coastal or inland) of a new nuclear power plant (particularly, an SMR). Furthermore, it is particularly suitable for use with air-cooled condensers in SMRs operating inland.

[0072] In addition, the modular casing according to the present invention can be used for both side exhaust and bottom exhaust methods by simply changing the arrangement direction.

[0073] By modularizing the casing design, human errors that may arise from design changes can be reduced, and in the event of an unexpected accident during transport of the Unit A turbine generator low-pressure turbine, emergency measures can be taken using products manufactured for Unit B, thereby preventing process delays.

[0074] According to the present invention, the inner casing is stably supported on the outer casing, thereby reducing the effect of casing sagging due to the condenser vacuum pressure, thereby improving vibration characteristics.

[0075] The above-described examples serve as illustrative examples of the present invention and are not intended to limit the scope of the present invention. Those skilled in the art will readily appreciate the potential for various modifications and implementations of the present invention. Therefore, the technical protection scope of the present invention should be defined by the appended claims.

Claims

1. In modular casing for low-pressure turbines of power plants, An inner casing that accommodates the rotor of the above low-pressure turbine and is extended in one direction; and Includes an outer casing that accommodates the inner casing, The above outer casing is, A square module for forming a first receiving space in the shape of a rectangular parallelepiped; and It includes a semicircular module for forming a second receiving space in a semi-cylindrical shape that is connected to the first receiving space. A modular casing in which a first through hole corresponding to one end of the inner casing and a second through hole corresponding to the other end of the inner casing are formed in the outer casing.

2. In paragraph 1, A part of the inner casing is located in the first receiving space and the rest is located in the second receiving space, The above first pass-through hole and the above second pass-through hole are each a modular casing in which some are formed in the square module and the rest are formed in the semicircular module.

3. In paragraph 2, The above square module includes a first horizontal support plate extending outward from the end, The above semicircular module includes a second horizontal support plate extending outward from the end, The first horizontal support plate and the second horizontal support plate face each other to form a horizontal support plate, The above horizontal support plate is a modular casing that extends horizontally in a lower exhaust manner in which the second receiving space is located above the first receiving space and comes into contact with the ground structure.

4. In paragraph 3, The above square module includes a first square module and a second square module, The first square module and the second square module each include a first vertical support plate extending outward from an end, The first vertical support plate of the first square module and the first vertical support plate of the second square module face each other to form a side vertical support plate, The above-mentioned side vertical support plate is a modular casing that extends horizontally in a side exhaust method in which the second receiving space is located on the side of the first receiving space and comes into contact with the ground structure.

5. In paragraph 4, The above semicircular module includes a first semicircular module and a second semicircular module, The first semicircular module and the second semicircular module each include a second vertical support plate extending outward from an end, The second vertical support plate of the first semicircular module and the second vertical support plate of the second semicircular module face each other to form an upper vertical support plate, The above upper vertical support plate is a modular casing that extends horizontally in a side exhaust manner in which the second receiving space is located on the side of the first receiving space and additionally comes into contact with the ground structure.

6. In paragraph 5, It is combined with the above inner casing, It further includes a support extending in the longitudinal direction of the inner casing, The above semicircular module is formed with a first receiving portion that protrudes outward, The above first receiving portion receives the end of the support in a lower exhaust manner in which the second receiving space is located above the first receiving space, The lower surface of the above support is a modular casing that is supported by contacting the above square module.

7. In paragraph 6, The first square module and the second square module each have a second receiving portion formed therein that protrudes outward. A modular casing in which the second receiving portion of the first square module and the second receiving portion of the first square module meet each other to form a first support space, and the first support space receives and supports the end of the support in a side exhaust method located on the side of the first receiving space.

8. In paragraph 7, The first semicircular module and the second semicircular module each have a third receiving portion formed therein that protrudes outward. A modular casing in which the third receiving portion of the first semicircular module and the third receiving portion of the second semicircular module meet each other to form a second support space, and the second support space additionally receives and supports the end of the support in a side exhaust method located on the side of the first receiving space.

9. In paragraph 8, Further comprising a spiral inlet located inside the inner casing, The above spiral inlet is, An inlet section that receives steam from a high-pressure turbine; An outlet for supplying steam to the above-mentioned rotating body; and A modular casing including a main body forming a spiral-shaped steam path connecting the inlet and outlet.

10. In paragraph 9, A modular casing in which an external inlet portion is formed in the above semicircular module and is connected to the above inlet portion.

11. In modular casing for low-pressure turbines of power plants, An inner casing that accommodates the rotor of the above low-pressure turbine and is extended in one direction; and Includes an outer casing that accommodates the inner casing, The above outer casing is, A square module for forming a first receiving space in the shape of a rectangular parallelepiped; and It includes a semicircular module for forming a second receiving space in the form of a semi-cylinder that is connected to the first receiving space. In the lower exhaust method in which the second receiving space is located above the first receiving space, the square module and the semicircular module extend horizontally to form a horizontal support plate in contact with the ground structure. A modular casing in which the second receiving space is located on the side of the first receiving space, the square module and the semicircular module form a first vertical support plate and a second vertical support plate, respectively, extending horizontally and in contact with the ground structure.

12. In paragraph 11, It is combined with the above inner casing, It further includes a support extending in the longitudinal direction of the inner casing, The above semicircular module receives the end of the support in a lower exhaust method in which the second receiving space is located above the first receiving space, The above square module is a modular casing that accommodates the end of the support in a side exhaust method in which the second accommodation space is located on the side of the first accommodation space.

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