Double-independent-support low-pressure module bearing type condenser for large nuclear power station
By installing multiple layers of supporting steel and reinforcing pipes inside the condenser throat, the problem of the weight of the low-pressure outer cylinder acting directly on the top surface of the condenser is solved, thereby enhancing the load-bearing capacity of the condenser and extending its service life.
Patent Information
- Application Number
- CN202511693676.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-18
- Publication Date
- 2026-02-03
AI Technical Summary
Existing condensers have poor load-bearing capacity and short service life because the entire weight of the low-pressure outer cylinder acts on the top surface of the condenser.
The condenser adopts a dual independent support low-pressure module load-bearing design. The throat is equipped with multiple layers of supporting steel and reinforced pipe connections. The throat and the lower part of the condenser shell bear the load of the low-pressure outer cylinder, which enhances the strength of the throat and reduces the load on the front and rear water chambers.
It improves the load-bearing capacity of the condenser, extends its service life, reduces the weight burden on the low-pressure outer cylinder, and meets the strength requirements of the unit.
Smart Images
Figure CN121452837A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of condensers, in particular to a double independent support low-pressure module bearing type condenser for large nuclear power plants. BACKGROUND
[0002] In recent years, large nuclear power plant steam turbine generator units of the level of million kilowatts and above have adopted spring foundations, and the condensers are rigidly connected with the low-pressure outer cylinders of the steam turbines, and the condensers adopt spring supports at the bottom (detailed configuration see Figure 7 ). In this configuration scheme, the condensers adopt spring supports, and the load of the condensers is loaded on the low-pressure outer cylinders, which increases the total load of the steam turbine generator unit, and the load of the steam turbine generator seat is large, and the cost is high. In addition, the dead point of the condenser is located on the operation layer platform of the steam turbine, and the distance between the inlet and outlet of the circulating water of the condenser water chamber is far from the dead point, so the thermal displacement is large, and the compensation section type of the circulating water pipeline is complex, and the cost is high.
[0003] With the continuous optimization and upgrading of the expansion type between the nuclear power steam turbine unit and the condenser, more and more units adopt expansion facilities arranged between the low-pressure inner and outer cylinders to compensate the thermal expansion between the steam turbine body and the condenser. Thus, the low-pressure inner and outer cylinders need to be independently supported, the low-pressure inner cylinder is supported on the operation platform through the rotor bearing, the low-pressure outer cylinder is rigidly connected with the condenser, the load borne by the low-pressure outer cylinder is transmitted through the condenser and finally borne by the condenser foundation, and the condenser also needs to completely bear the load of the low-pressure outer cylinder in the process of transmitting the load. This configuration scheme can improve the economy of the steam turbine generator unit and improve the stability of the condenser (detailed configuration see Figure 8 ).
[0004] In summary, in the process of using the existing condenser, the low-pressure outer cylinder is installed on the upper surface of the condenser, so the total weight of the low-pressure outer cylinder acts on the top surface of the condenser, and due to the poor bearing capacity of the condenser, the service life is short. SUMMARY
[0005] The present application is to solve the problem that in the process of using the existing condenser, the low-pressure outer cylinder is installed on the upper surface of the condenser, so the total weight of the low-pressure outer cylinder acts on the top surface of the condenser, and due to the poor bearing capacity of the condenser, the service life is short, and a double independent support low-pressure module bearing type condenser for large nuclear power plants is proposed.
[0006] The double independent support low-pressure module bearing type condenser for large nuclear power plants comprises a throat portion 1, a condenser shell lower portion 2, heat exchange pipes 3, a tube plate 4, a front water chamber 5, a rear water chamber 6, a rigid support seat 7 and an intermediate tube plate 8.
[0007] The top end of the lower part 2 of the condenser shell is connected with the bottom end of the throat part 1, and the throat part 1 is arranged in communication with the inside of the lower part 2 of the condenser shell, the inside top end of the lower part 2 of the condenser shell is provided with heat exchange pipes 3, and a plurality of intermediate tube plates 8 are arranged along the length direction at the inside middle line of the lower part 2 of the condenser shell, and the end portions of the heat exchange pipes 3 pass through the plurality of intermediate tube plates 8 in sequence, the intermediate tube plates 8 are connected with the lower part 2 of the condenser shell through fixed rib plates, the central part of one end face of the lower part 2 of the condenser shell is provided with a front water chamber 5, the central part of the other end face of the lower part 2 of the condenser shell is provided with a rear water chamber 6, and one tube plate 4 is arranged at the connection part between the one end face of the lower part 2 of the condenser shell and the front water chamber 5 and at the connection part between the other end face of the lower part 2 of the condenser shell and the rear water chamber 6, respectively, and a plurality of rigid support seats 7 are uniformly arranged on the lower surface of the lower part 2 of the condenser shell;
[0008] Further, the heat exchange pipes 3 and the tube plates 4 are connected through expansion welding and sealing welding;
[0009] Further, the throat part 1 comprises a throat part shell 1-1, reinforcing pipes 1-2, a support steel layer 1-3, a second heater 1-4 and a first heater 1-5;
[0010] The inside of the throat part shell 1-1 is uniformly provided with n layers of support steel layers 1-3 along the height direction, n is a positive integer, the support steel layers 1-3 are connected through a plurality of reinforcing pipes 1-2 between every two layers, and the support steel layers 1-3 are connected through a plurality of reinforcing pipes 1-2 between the edge of each layer and the inner wall of the throat part shell 1-1, the support steel layer 1-3 is composed of a plurality of shaped steels, the plurality of shaped steels are arranged in horizontal and vertical intersection, and the upper surface of the top layer of the support steel layers 1-3 in the inside of the throat part shell 1-1 is sequentially provided with the second heater 1-4 and the first heater 1-5 along the width direction;
[0011] Further, the bases of the second heater 1-4 and the first heater 1-5 are fixedly connected with the upper surface of the top layer of the support steel layers 1-3 in the inside of the throat part shell 1-1;
[0012] Further, the reinforcing pipes 1-2 between the edge of each layer of the support steel layers 1-3 and the inner wall of the throat part shell 1-1 are arranged in an inclined manner;
[0013] Further, the thickness of the throat part shell 1-1 is at least 22 mm;
[0014] Further, the number n of layers of the support steel layer 1-3 is 2≤n≤6;
[0015] Furthermore, during use, multiple rigid support seats 7 are evenly provided on the lower surface of the lower part 2 of the condenser shell. Therefore, the front water chamber 5 and the rear water chamber 6 do not bear the load of the low-pressure outer cylinder, while the throat 1 and the lower part 2 of the condenser shell bear the load of the low-pressure outer cylinder. Therefore, this invention focuses on the throat and lower part of the condenser. The throat 1 has multiple layers of supporting steel layers 1-3 inside, and two layers of supporting steel layers 1-3 are connected by multiple reinforcing pipes 1-2. Depending on the height of the throat 1, 2 to 3 layers of supporting steel layers 1-3 are set. Since the top layer of supporting steel layers 1-3 needs to install two low-pressure heaters, multiple steel profiles are arranged horizontally and vertically in a crisscross pattern. The steel profiles have good rigidity and can bear the load of the low-pressure heaters. The edges of each supporting steel layer 1-3 are connected to the inner wall of the throat shell 1-1 by multiple reinforcing pipes 1-2, which increases the strength of the entire throat 1. Furthermore, compared to the conventional "well"-shaped reinforcement tube arrangement at the top of the condenser, the dense arrangement of the "well"-shaped reinforcement tubes makes it more difficult to arrange the throat low-pressure heater and its extraction steam pipeline in the throat, especially for condensers with a split throat low-pressure heater design. Using inclined reinforcement tubes 1-2 to support the throat shell 1-1 provides ample space in the middle of the throat, allowing for the placement of two split throat low-pressure heaters and their extraction steam pipeline. The reinforcement tubes 1-2 directly support the inside of the throat shell 1-1. A shell plate thickness of ≥22mm is recommended; finite element analysis shows the strength meets unit requirements. Reducing the number of reinforcement ribs decreases the number of parts and welding workload. This condenser structure significantly improves load-bearing capacity, as the weight of the low-pressure outer cylinder is far less than the rated load-bearing capacity of this type of condenser, thus extending the condenser's service life.
[0016] Compared with the prior art, the present invention has the following advantages:
[0017] This invention overcomes the shortcomings of existing technologies by employing a multi-layered supporting steel structure inside the throat, with multiple reinforcing pipes connecting two layers. Depending on the throat height, 2-3 supporting steel layers are used. The top layer, which houses two low-pressure heaters, utilizes multiple cross-shaped steel sections arranged horizontally and vertically, providing good rigidity and capable of bearing the load of the low-pressure heaters. Multiple reinforcing pipes connect the edges of each supporting steel layer to the inner wall of the throat shell, increasing the overall strength of the throat. Furthermore, compared to the conventional "well"-shaped reinforcing pipe arrangement at the top of a condenser, the dense arrangement of these pipes makes it difficult to arrange the throat low-pressure heaters and their extraction steam pipes, especially for condenser throats with split-type throat low-pressure heater designs. The invention uses diagonally braced reinforcing pipes to support the throat shell, resulting in a larger space in the throat, providing ample room for arranging two split-type throat low-pressure heaters and their extraction steam pipes. Finite element analysis shows that the strength meets the unit requirements; this type of condenser can greatly improve the load-bearing capacity, and the weight of the low-pressure outer cylinder is much less than the rated load-bearing capacity of the condenser of this type of mechanism, thereby extending the service life of the condenser. Attached Figure Description
[0018] Figure 1 This is a front view of a double-independent-support low-pressure module load-bearing condenser for a large nuclear power plant, as described in this invention.
[0019] Figure 2 This is a main sectional view of the throat of a double-independent-support low-pressure module condenser for a large nuclear power plant, as described in this invention.
[0020] Figure 3 This is a side sectional view of the throat of a double-independent-support low-pressure module load-bearing condenser for a large nuclear power plant, as described in this invention.
[0021] Figure 4 yes Figure 2 A cross-sectional view along the AA direction of the throat in a double-independent-support low-pressure module load-bearing condenser for a large nuclear power plant, as described in this invention;
[0022] Figure 5 yes Figure 2 A cross-sectional view along the BB direction of the throat in a double-independent-support low-pressure module condenser for a large nuclear power plant, as described in this invention;
[0023] Figure 6 This is a top sectional view of the lower part of the condenser shell in a double independent support low-pressure module load-bearing condenser for a large nuclear power plant, as described in this invention.
[0024] Figure 7 This is a schematic diagram of an existing condenser that is rigidly connected to the low-pressure outer cylinder of the steam turbine, with spring supports at the bottom of the condenser.
[0025] Figure 8 This is a schematic diagram of the structure connecting the nuclear power turbine unit and the condenser via an expansion type. Detailed Implementation
[0026] Specific implementation method one: Combining Figure 1 This embodiment describes a large nuclear power plant dual-independent-support low-pressure module condenser, which comprises a throat 1, a lower part of the condenser shell 2, heat exchange tubes 3, tube sheet 4, a front water chamber 5, a rear water chamber 6, a rigid support base 7, and an intermediate tube sheet 8.
[0027] The top end of the lower part 2 of the condenser shell is connected to the bottom end of the throat 1, and the throat 1 is connected to the interior of the lower part 2 of the condenser shell. The top end of the interior of the lower part 2 of the condenser shell is provided with heat exchange tubes 3, and multiple intermediate tube sheets 8 are provided along the length direction at the center line of the interior of the lower part 2 of the condenser shell. The ends of the heat exchange tubes 3 pass through multiple intermediate tube sheets 8 in sequence. The intermediate tube sheets 8 are connected to the lower part 2 of the condenser shell with fixing ribs. A front water chamber 5 is provided at the center of one end face of the lower part 2 of the condenser shell, and a rear water chamber 6 is provided at the center of the other end face of the lower part 2 of the condenser shell. A tube sheet 4 is provided at the connection between one end face of the lower part 2 of the condenser shell and the front water chamber 5 and the connection between the other end face of the lower part 2 of the condenser shell and the rear water chamber 6. Multiple rigid support seats 7 are evenly provided on the lower surface of the lower part 2 of the condenser shell.
[0028] In this specific embodiment, during use, multiple rigid support seats 7 are evenly provided on the lower surface of the lower part 2 of the condenser shell. Therefore, the front water chamber 5 and the rear water chamber 6 do not bear the load of the low-pressure outer cylinder, while the throat 1 and the lower part 2 of the condenser shell bear the load of the low-pressure outer cylinder. Therefore, this invention focuses on the throat and lower part of the condenser. The throat 1 has multiple layers of supporting steel layers 1-3 inside, and two layers of supporting steel layers 1-3 are connected by multiple reinforcing pipes 1-2. Depending on the height of the throat 1, 2 to 3 layers of supporting steel layers 1-3 are set. Since the top layer of supporting steel layers 1-3 needs to install two low-pressure heaters, multiple steel profiles are arranged horizontally and vertically in a crisscross pattern. The steel profiles have good rigidity and can bear the load of the low-pressure heaters. The edges of each supporting steel layer 1-3 are connected to the inner wall of the throat shell 1-1 by multiple reinforcing pipes 1-2, which increases the strength of the entire throat 1. Furthermore, compared to the conventional "well"-shaped reinforcement tube arrangement at the top of the condenser, the dense arrangement of the "well"-shaped reinforcement tubes makes it more difficult to arrange the throat low-pressure heater and its extraction steam pipeline in the throat, especially for condensers with a split throat low-pressure heater design. Using inclined reinforcement tubes 1-2 to support the throat shell 1-1 provides ample space in the middle of the throat, allowing for the placement of two split throat low-pressure heaters and their extraction steam pipeline. The reinforcement tubes 1-2 directly support the inside of the throat shell 1-1. A shell plate thickness of ≥22mm is recommended; finite element analysis shows the strength meets unit requirements. Reducing the number of reinforcement ribs decreases the number of parts and welding workload. This condenser structure significantly improves load-bearing capacity, as the weight of the low-pressure outer cylinder is far less than the rated load-bearing capacity of this type of condenser, thus extending the condenser's service life.
[0029] Specific Implementation Method Two: Combining Figure 1 This embodiment further defines the condenser described in Specific Embodiment 1. The condenser described in this embodiment is a dual independent support low-pressure module condenser for large nuclear power plants, wherein the heat exchange tubes 3 and tube sheet 4 are connected by expansion welding and sealing welding.
[0030] In this specific embodiment, the heat exchange tube 3 and the tube sheet 4 are connected by expansion welding and sealing welding to ensure the sealing performance of the tube ends.
[0031] Specific implementation method three: Combining Figures 1 to 6 This embodiment further defines the condenser described in Specific Embodiment 1. The condenser for a large nuclear power plant with dual independent support low-pressure module bearing condenser described in this embodiment includes a throat 1 comprising a throat shell 1-1, a reinforcing tube 1-2, a supporting steel layer 1-3, a second heater 1-4, and a first heater 1-5.
[0032] The throat shell 1-1 has n layers of supporting steel layers 1-3 evenly arranged along the height direction inside, where n is a positive integer. Each pair of supporting steel layers 1-3 is connected by multiple reinforcing tubes 1-2, and the edge of each supporting steel layer 1-3 is connected to the inner wall of the throat shell 1-1 by multiple reinforcing tubes 1-2. The supporting steel layers 1-3 are composed of multiple steel profiles, which are arranged in a cross pattern. The upper surface of the top supporting steel layer 1-3 inside the throat shell 1-1 is provided with a second heater 1-4 and a first heater 1-5 along the width direction.
[0033] In this specific embodiment, the throat is internally equipped with multiple layers of supporting steel, with several reinforcing pipes connecting the layers. Depending on the throat height, 2-3 layers of supporting steel are used. The top layer, which houses two low-pressure heaters, employs multiple cross-shaped steel sections arranged horizontally and vertically. These steel sections have good rigidity and can bear the load of the low-pressure heaters. Multiple reinforcing pipes connect the edges of each supporting steel layer to the inner wall of the throat shell, increasing the overall strength of the throat. Furthermore, compared to the conventional "well"-shaped reinforcing pipe arrangement at the top of a condenser, the dense arrangement of these pipes makes it difficult to arrange the throat low-pressure heaters and their extraction steam pipes, especially for condenser throats with split-type throat low-pressure heater designs. The use of diagonally braced reinforcing pipes to support the throat shell provides ample space in the middle of the throat, allowing for the placement of two split-type throat low-pressure heaters and their extraction steam pipes. Finite element analysis shows that the strength meets the unit requirements; this type of condenser can greatly improve the load-bearing capacity, and the weight of the low-pressure outer cylinder is much less than the rated load-bearing capacity of the condenser of this type of mechanism, thereby extending the service life of the condenser.
[0034] Specific implementation method four: Combination Figures 1 to 6 This embodiment further defines the condenser described in Specific Embodiment Three. In this embodiment, a dual independent support low-pressure module condenser for a large nuclear power plant is described, wherein the bases of the No. 2 heater 1-4 and the No. 1 heater 1-5 are fixedly connected to the upper surface of the top layer support steel layer 1-3 inside the uniform throat shell 1-1.
[0035] Specific implementation five: combination Figures 1 to 6 This embodiment is a further limitation of the condenser described in specific implementation three. The condenser described in this embodiment is a double independent support low-pressure module bearing type condenser for large nuclear power plants. The reinforcing pipes 1-2 between the edges of each support steel layer 1-3 and the inner wall of the throat shell 1-1 are inclined.
[0036] In this specific implementation, the reinforcing pipes 1-2 between the edges of each support steel layer 1-3 and the inner wall of the throat shell 1-1 are connected by multiple reinforcing pipes 1-2, and the reinforcing pipes 1-2 are inclined. This enhances the carrying capacity of the entire throat 1.
[0037] Specific implementation six: combination Figures 1 to 6 This embodiment is a further limitation of the condenser described in specific implementation five. The condenser described in this embodiment is a double independent support low-pressure module bearing type condenser for large nuclear power plants. The thickness of the throat shell 1-1 is at least 22mm.
[0038] Specific implementation seven: combination Figures 1 to 6 This embodiment is a further limitation of the condenser described in specific implementation three. The condenser described in this embodiment is a double independent support low-pressure module bearing type condenser for large nuclear power plants. The number of support steel layers 1-3 is 2≤n≤6.
[0039] Working principle
[0040] In operation, multiple rigid support seats 7 are evenly arranged on the lower surface of the lower part 2 of the condenser shell. Therefore, the front water chamber 5 and the rear water chamber 6 do not bear the load of the low-pressure outer cylinder, while the throat 1 and the lower part 2 of the condenser shell bear the load of the low-pressure outer cylinder. Therefore, this invention focuses on the throat and lower part of the condenser. The throat 1 has multiple layers of supporting steel layers 1-3 inside, and two layers of supporting steel layers 1-3 are connected by multiple reinforcing pipes 1-2. Depending on the height of the throat 1, 2 to 3 layers of supporting steel layers 1-3 are set. Since the top layer of supporting steel layers 1-3 needs to install two low-pressure heaters, multiple steel profiles are arranged in a cross pattern of horizontal and vertical. The steel profiles have good rigidity and can bear the load of the low-pressure heaters. The edges of each supporting steel layer 1-3 are connected to the inner wall of the throat shell 1-1 by multiple reinforcing pipes 1-2, which increases the strength of the entire throat 1. Furthermore, compared to the conventional "well"-shaped reinforcement tube arrangement at the top of the condenser, the dense arrangement of the "well"-shaped reinforcement tubes makes it more difficult to arrange the throat low-pressure heater and its extraction steam pipeline in the throat, especially for condensers with a split throat low-pressure heater design. Using inclined reinforcement tubes 1-2 to support the throat shell 1-1 provides ample space in the middle of the throat, allowing for the placement of two split throat low-pressure heaters and their extraction steam pipeline. The reinforcement tubes 1-2 directly support the inside of the throat shell 1-1. A shell plate thickness of ≥22mm is recommended; finite element analysis shows the strength meets unit requirements. Reducing the number of reinforcement ribs decreases the number of parts and welding workload. This condenser structure significantly improves load-bearing capacity, as the weight of the low-pressure outer cylinder is far less than the rated load-bearing capacity of this type of condenser, thus extending the condenser's service life.
Claims
1. A double-independent-support low-pressure module-type condenser for large nuclear power plants, characterized in that: It includes a throat (1), a lower part of the condenser shell (2), heat exchange tubes (3), tube sheet (4), front water chamber (5), rear water chamber (6), rigid support seat (7), and intermediate tube sheet (8). The top of the lower part (2) of the condenser shell is connected to the bottom of the throat (1), and the throat (1) is connected to the interior of the lower part (2) of the condenser shell. The top of the interior of the lower part (2) of the condenser shell is provided with heat exchange tubes (3), and multiple intermediate tube sheets (8) are provided along the length direction at the center line of the interior of the lower part (2) of the condenser shell. The ends of the heat exchange tubes (3) pass through multiple intermediate tube sheets (8) in sequence. The intermediate tube sheets (8) are connected to the lower part (2) of the condenser shell with fixed ribs. A front water chamber (5) is provided at the center of one end face of the lower part (2) of the condenser shell. A rear water chamber (6) is provided at the center of the other end face of the lower part (2) of the condenser shell. A tube sheet (4) is provided at the connection between one end face of the lower part (2) of the condenser shell and the front water chamber (5) and the connection between the other end face of the lower part (2) of the condenser shell and the rear water chamber (6). Multiple rigid support seats (7) are uniformly provided on the lower surface of the lower part (2) of the condenser shell.
2. The large-scale nuclear power plant double-independent-support low-pressure module condenser according to claim 1, characterized in that: The heat exchange tube (3) and tube sheet (4) are connected by expansion welding and sealing welding.
3. The double-independent-support low-pressure module condenser for large nuclear power plants according to claim 1, characterized in that: The throat (1) includes a throat shell (1-1), a reinforcing tube (1-2), a supporting steel layer (1-3), a second heater (1-4), and a first heater (1-5). The throat shell (1-1) has n layers of supporting steel (1-3) evenly arranged along the height direction inside, where n is a positive integer. Each pair of supporting steel layers (1-3) is connected by multiple reinforcing tubes (1-2), and the edge of each supporting steel layer (1-3) is connected to the inner wall of the throat shell (1-1) by multiple reinforcing tubes (1-2). The supporting steel layer (1-3) is composed of multiple steel profiles, which are arranged horizontally and vertically. The upper surface of the top supporting steel layer (1-3) inside the throat shell (1-1) is provided with a second heater (1-4) and a first heater (1-5) in sequence along the width direction.
4. A double-independent-support low-pressure module condenser for large nuclear power plants according to claim 3, characterized in that: The base of the second heater (1-4) and the first heater (1-5) are fixedly connected to the upper surface of the inner top layer support steel layer (1-3) of the uniform throat shell (1-1).
5. A large-scale nuclear power plant dual-independent-support low-pressure module condenser according to claim 3, characterized in that: The reinforcing tube (1-2) between the edge of each supporting steel layer (1-3) and the inner wall of the throat shell (1-1) is inclined.
6. A large-scale nuclear power plant dual-independent-support low-pressure module-type condenser according to claim 5, characterized in that: The thickness of the throat shell (1-1) is at least 22 mm.
7. A large-scale nuclear power plant dual-independent-support low-pressure module condenser according to claim 3, characterized in that: The number of layers n of the supporting steel layers (1-3) is 2≤n≤6.