Symmetrical arrangement structure of double-high-position single-span main workshop of multi-shaft gas-steam combined cycle unit

Abstract

The present application relates to the technical field of main plant layout design of gas turbine power plant, and aims to solve the problems of weak overall performance, large floor area and inconvenient operation and maintenance of the existing main plant layout of multi-shaft gas-steam combined cycle unit, and provides a symmetrical layout structure of double-high single-span main plant of multi-shaft gas-steam combined cycle unit, which comprises a gas turbine-steam turbine combined main plant, gas turbine generator units and steam turbine generator units are arranged in the main plant, and the gas turbine generator units and the steam turbine generator units are mirror-symmetrically arranged in the main plant; the gas turbine generator units are coaxially arranged with waste heat boilers, the waste heat boilers are arranged outside the main plant, the waste heat boilers are also mirror-symmetrically arranged, and a centralized control building is arranged between the waste heat boilers; from bottom to top, a main plant bottom layer, a main plant middle layer and a main plant operation layer are sequentially arranged in the main plant, and the main plant operation layer is used for arranging the steam turbine generator units and the gas turbine generator units.

Description

Technical Field

[0001] This invention relates to the field of main plant layout design technology for gas turbine power plants, specifically a symmetrical layout structure of a double-high-level single-span main plant for a multi-shaft gas-steam combined cycle unit. Background Technology

[0002] Gas-steam combined cycle units are devices in the field of power engineering that combine gas turbine units with steam turbines to achieve efficient power generation. The unit generates electricity by using the high-temperature gas generated by the combustion of gas turbines, and then uses the waste heat of the gas turbine exhaust to generate steam to drive the steam turbine for secondary power generation through a waste heat boiler.

[0003] In a multi-shaft gas-steam combined cycle unit, the gas turbine and steam turbine are relatively independent, with the two main units not coaxial, and each is equipped with a steam turbine generator or a gas turbine generator; in the corresponding single-shaft arrangement, the gas turbine and steam turbine are closely connected, coaxial and sharing a generator.

[0004] The main plant is the core structure of a gas-fired combined cycle power plant, providing the fixed installation foundation and spatial layout support for gas turbines, steam turbines, waste heat boilers, generators, various auxiliary equipment, and various process pipelines and cables. Its layout planning and the arrangement of process equipment are crucial, directly affecting the entire process of power plant construction and operation. The layout of the main plant and its main process equipment and systems determines the building's land area and space utilization efficiency, the amount of materials used in the process systems, the convenience of construction and installation, the power plant's construction cycle, and the safety and stability of the power plant's long-term operation.

[0005] The main plant layout mainly includes three core parts: gas turbine generator set, steam turbine generator set, and waste heat boiler. Each gas-steam combined cycle unit includes one gas turbine generator set, one steam turbine generator set, and one waste heat boiler.

[0006] Gas turbine generator sets include gas turbines, gas turbine generators and their auxiliary equipment; steam turbine generator sets include steam turbines, steam turbine generators and their auxiliary equipment; waste heat boilers include waste heat boilers and their auxiliary equipment.

[0007] The layout of gas-steam combined cycle units mainly involves several choices. Firstly, there are high-level, low-level, or semi-high-level arrangements of the gas turbine and steam turbine. A high-level arrangement means the main plant is divided into a 0m level, an intermediate level, and an operating level, with the gas turbine and steam turbine positioned at the top, i.e., the operating level. A low-level arrangement means the main plant is divided into a 0m level for the gas turbine island area and a 0m level for the steam turbine island area (the 0m level for both areas is the same level), and an operating level (without an intermediate level; the operating level is only formed by raising the turbine's central axis to accommodate downward steam exhaust). The gas turbine is positioned at the 0m level, and the steam turbine is positioned at the bottom without an intermediate level. The main plant can be divided into two types of layouts: First, the gas turbine and steam turbine can be arranged in a semi-elevated manner. The gas turbine and steam turbine are arranged in a semi-elevated position, meaning the main plant is divided into two levels from bottom to top: the 0m level for the gas turbine island area and the 0m level for the steam turbine island area (the 0m levels for both areas are the same level), an intermediate level, and the operating level. The gas turbine is located at a lower level on the 0m level, and the steam turbine is located at a higher level on the operating level with the intermediate level. Second, the gas turbine, steam turbine, and boiler can be arranged in a parallel or mirror-symmetrical manner. A parallel arrangement means that the gas turbine, steam turbine, and waste heat boiler are all arranged sequentially in a straight line on the same level, with two gas-steam combined cycle units arranged identically. A mirror-symmetrical arrangement means that two gas-steam combined cycle units are arranged mirror-symmetrically about a symmetry axis. These three components can be further combined in a reasonable and organic way depending on the specific circumstances.

[0008] Existing layout schemes for multi-shaft gas-steam combined cycle units include a fully low-level symmetrical layout (both steam turbines and gas turbines are located at low levels, both symmetrically arranged), a semi-high-level symmetrical layout (both steam turbines and gas turbines are located at high levels, both symmetrically arranged), and a high-level parallel layout (both steam turbines and gas turbines are located at high levels, arranged in parallel). Among these layout schemes, the fully low-level symmetrical layout has a large main plant area; the semi-high-level symmetrical layout weakens the overall integrity of the main plant due to the different elevations of the gas turbines and steam turbines at high levels, causing some inconvenience for personnel operation and maintenance, and the gas turbine room and steam turbine room are relatively independent, so the overhead cranes cannot be shared; the high-level parallel layout has two units arranged relatively independently, which is not conducive to the placement of public buildings such as the centralized control building, and reduces the overall integrity of the main plant area. Summary of the Invention

[0009] The technical problem to be solved by this invention is to provide a symmetrical layout structure for the main plant of a multi-shaft gas-steam combined cycle unit, which addresses the problems of weak overall integrity, large footprint, and inconvenient operation and maintenance in the existing main plant layout.

[0010] The technical solution adopted in this invention is as follows: This invention provides a symmetrical arrangement structure of a multi-shaft gas-steam combined cycle unit with a double-high-level single-span main plant, including a gas turbine-steam turbine combined main plant, in which gas turbine generator sets and steam turbine generator sets are arranged, and the gas turbine generator sets and steam turbine generator sets are arranged in a mirror symmetrical manner in the gas turbine-steam turbine combined main plant; The gas turbine generator set has a waste heat boiler coaxially arranged outside the gas turbine-steam turbine combined main plant building. The waste heat boilers are also arranged in a mirror symmetrical manner, and a centralized control building is arranged between the waste heat boilers. The main plant building for the gas turbine-steam turbine combined unit consists of a ground floor, a middle floor, and an operating floor, arranged from bottom to top. The ground floor and middle floor are used to house the auxiliary equipment and systems of the steam turbine generator sets and the gas turbine generator sets, while the operating floor is used to house the steam turbine generator sets and the gas turbine generator sets.

[0011] The present invention features a symmetrical layout structure of a dual-high-level single-span main plant for a multi-shaft gas-steam combined cycle unit. The gas turbine generator set, steam turbine generator set, and waste heat boiler are all arranged in a mirror symmetrical manner. The area between the waste heat boilers of the two gas-steam combined cycle units can accommodate a centralized control building and other public facilities, resulting in a smaller overall footprint and a more compact layout, improving the overall integrity of the main plant area. Moreover, with this arrangement, the centralized control building can be shared by at least two gas-steam combined cycle units. The steam turbine generator set and the gas turbine generator set of the present invention are arranged on the main plant operating floor. They are at the same elevation, have strong integrity, and are convenient for staff to operate and maintain. The gas turbine-steam turbine combined main plant of this invention features a three-level platform, which provides excellent conditions for the dual high-level arrangement of gas turbine generator sets and steam turbine generator sets, and together forms an advantage of efficient space utilization, with a smaller footprint compared to a fully low-level arrangement. At the same time, the unified operating platform enables the sharing of traveling equipment between gas turbine generator sets and steam turbine generator sets, and provides better space for placing large components during maintenance, thereby improving the uniformity, convenience and safety of operation and maintenance.

[0012] As a preferred technical solution: The ground floor of the main plant is the 0m floor.

[0013] As a preferred technical solution: Both gas turbine generator sets and steam turbine generator sets are installed in pairs; The paired gas turbine generator sets and steam turbine generator sets are arranged in a mirror-symmetric manner about the center line of the main plant of the combined gas turbine and steam turbine main plant. The paired waste heat boilers are also arranged in a mirror-symmetric manner about the center line of the main plant of the combined gas turbine and steam turbine main plant. The paired steam turbine generator sets are arranged on both sides of the symmetrical center line of the main plant; the paired gas turbine generator sets are arranged on the outside of the steam turbine generator sets.

[0014] As a preferred technical solution: The gas turbine generator set includes a gas turbine body and a gas turbine generator. The gas turbine body and the gas turbine generator are arranged coaxially and connected to each other. A steam turbine generator set includes a steam turbine body and a steam turbine generator. The steam turbine body and the steam turbine generator are arranged coaxially and connected to each other. The waste heat boiler includes the waste heat boiler body, the waste heat boiler feedwater pump room, and the waste heat boiler connecting flue. The waste heat boiler body is connected to the waste heat boiler connecting flue, the waste heat boiler body is connected to the waste heat boiler feedwater pump room, the waste heat boiler connecting flue is connected to the gas turbine body, and the waste heat boiler feedwater pump room is connected to the steam turbine body. The waste heat boiler feedwater pump room is located between the waste heat boiler body and the central control building.

[0015] As a preferred technical solution: The waste heat boiler body is connected to the control system, communication system and process system of the waste heat boiler feedwater pump room.

[0016] As a preferred technical solution: The lower part of the gas turbine body is connected to the gas turbine air intake, which is located on the ground floor of the main plant. The gas turbine intake duct connects to the gas turbine intake device in the direction of the waste heat boiler.

[0017] As a preferred technical solution: The gas turbine body is connected to a gas turbine exhaust duct, which discharges towards the waste heat boiler. The gas turbine exhaust duct is located above the gas turbine intake duct and the gas turbine intake device, and it is connected to the waste heat boiler body through the waste heat boiler connecting flue.

[0018] This results in a high-position lower air intake arrangement.

[0019] As a preferred technical solution: The steam turbine body is connected to the steam turbine condenser, which is located on the ground floor of the main plant.

[0020] In this way, the steam turbine body exhausts steam downwards to the steam turbine condenser. The exhaust steam is discharged from the low-pressure cylinder of the main plant operating floor to the steam turbine condenser on the bottom floor of the main plant using the downward exhaust method, forming a high-level exhaust arrangement.

[0021] As a preferred technical solution: The gas turbine generator sets and steam turbine generator sets are arranged laterally in the combined gas turbine and steam turbine main plant.

[0022] As a preferred technical solution: A gas turbine generator set, a steam turbine generator set, and a waste heat boiler constitute a gas-steam combined cycle unit; Each gas-steam combined cycle unit is equipped with a maintenance bay, which is located between the gas turbine generator set and the steam turbine generator set.

[0023] As a preferred technical solution: The gas turbine-steam turbine combined main plant adopts a single span, with columns A and B on opposite sides of the gas turbine-steam turbine combined main plant. The span direction of the single span is from column A to column B. The waste heat boiler is arranged outside column B of the gas turbine-steam turbine combined main plant.

[0024] As a preferred technical solution: The main plant building has overhead crane brackets formed on the structural columns of columns A and B of the gas turbine-steam turbine combined main plant building. The main plant building overhead crane tracks are installed on the overhead crane brackets. Two main plant building overhead cranes are arranged on the main plant building overhead crane tracks. The main plant building overhead cranes have running mechanisms and lifting mechanisms.

[0025] In this way, the overhead crane in the main plant can be shared by at least two gas-steam combined cycle units.

[0026] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1) The gas turbine generator set, steam turbine generator set and waste heat boiler are arranged in a mirror symmetrical manner. The area between the waste heat boilers of the two units can be used to arrange the central control building and other public facilities, which makes the overall layout smaller and more compact, which facilitates the overall layout of the power plant and saves initial investment while having a good external appearance. 2) The steam turbine generator set has more connections with the public systems in the central control building area than the gas turbine generator set (such as closed-loop cooling water, compressed air system, etc.). The steam turbine generator sets of the two units are located close to the central control building, which strengthens the connection between the steam turbine generator set's supporting systems and the public systems in the central control building and makes this connection simpler. 3) By arranging the waste heat boiler feedwater pump room between the waste heat boiler body and the central control building, the distance between the relevant control systems in the waste heat boiler feedwater pump room and the central control building is shortened, which can facilitate the strengthening of communication between them. 4) Set up a short span near the center line of the mirror symmetry of the main plant. While arranging expansion joints within this span, it also serves as the layout of public systems in the main plant. This can strengthen the connection between the systems in the main plant and the various public systems in the centralized control building. At the same time, two unit valve stations are centrally arranged in this area, which significantly improves the convenience and aesthetics of centralized valve operation and maintenance. 5) Both the gas turbine generator set and the steam turbine generator set are arranged in a high position, which improves the space utilization in the vertical direction and significantly reduces the longitudinal length of the main plant, the total floor area and the civil engineering cost. 6) The main plant adopts a combined plant for gas turbine generator sets and steam turbine generator sets, and uses the same large operating platform, which realizes the sharing of the traveling equipment of gas turbine generator sets and steam turbine generator sets. The space for placing large components during maintenance is better, which improves the uniformity, convenience and safety of operation and maintenance. 7) The two units share two overhead cranes, adopting a dual-crane lifting design, which facilitates the lifting of heavy equipment during construction, saving initial investment and shortening the installation cycle; 8) The maintenance bay is located in the front row of the main plant (i.e., column A, the side of the main plant away from the waste heat boiler). The space outside the main plant is spacious, which facilitates the entry and exit of equipment and components. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the symmetrical layout of the double-high-level single-span main plant of the multi-shaft gas-steam combined cycle unit described in this invention.

[0028] Figure 2 This is a schematic cross-sectional view of the symmetrical arrangement of the double-high-level single-span main plant of the multi-shaft gas-steam combined cycle unit described in this invention at the steam turbine generator unit.

[0029] Figure 3 This is a schematic cross-sectional view of the symmetrical arrangement structure of the double-high-level single-span main plant of the multi-shaft gas-steam combined cycle unit described in this invention at the gas turbine generator set.

[0030] Icons: 1 ~ Gas turbine-steam turbine combined main plant, 2 ~ Gas turbine generator set, 3 ~ Steam turbine generator set, 4 ~ Waste heat boiler, 5 ~ Central control building, 6 ~ Main plant 0m floor, 7 ~ Main plant intermediate floor, 8 ~ Main plant operating floor, 9 ~ Main plant overhead crane bracket, 10 ~ Main plant overhead crane track, 11 ~ Maintenance span, 12 ~ Short span, 13 ~ Main plant symmetry centerline, 14 ~ Main plant overhead crane, 21 ~ Gas turbine body, 22 ~ Gas turbine generator, 23 ~ Gas turbine exhaust duct, 24 ~ Gas turbine intake device, 25 ~ Gas turbine intake duct, 31 ~ Steam turbine body, 32 ~ Steam turbine generator, 33 ~ Steam turbine condenser, 41 ~ Waste heat boiler body, 42 ~ Waste heat boiler feedwater pump room, 43 ~ Waste heat boiler connecting flue. Detailed Implementation

[0031] The present invention will now be described in detail with reference to the accompanying drawings.

[0032] Example 1 Reference Figure 1 This embodiment provides a symmetrical layout structure of a multi-shaft gas-steam combined cycle unit with a double high-level single-span main plant, including a gas turbine-steam turbine combined main plant 1. The gas turbine-steam turbine combined main plant 1 adopts a single span, that is, only the AB span. The side of the gas turbine-steam turbine combined main plant 1 closest to the waste heat boiler 4 is column B, and the side furthest from the waste heat boiler 4 is column A.

[0033] The gas turbine generator set 2 and the steam turbine generator set 3 are arranged laterally in the main gas turbine generator set 1. Figure 1 As shown, the length direction of the gas turbine-steam turbine combined main plant 1 is longitudinal, and the gas turbine generator set 2 and steam turbine generator set 3 are arranged transversely in the gas turbine-steam turbine combined main plant 1.

[0034] Gas turbine generator sets 2 are installed in pairs, and steam turbine generator sets 3 are also installed in pairs. Both the gas turbine generator sets 2 and the steam turbine generator sets 3 are arranged in a mirror-symmetric manner about the center line 13 of the main plant of the combined gas turbine and steam turbine main plant 1.

[0035] Preferably, the gas turbine generator sets 2 are arranged in pairs, and the number of gas turbine generator sets 2 is not limited to 2, but can also be 4, etc.

[0036] Steam turbine generator set 3 is arranged close to the symmetrical center line 13 of the main plant, while gas turbine generator set 2 is arranged away from the symmetrical center line 13 of the main plant. That is, the two steam turbine generator sets 3 are arranged on both sides of the symmetrical center line 13 of the main plant, and the two gas turbine generator sets 2 are arranged outside the two steam turbine generator sets 3. The steam turbine generator sets 3 are closer to the symmetrical center line 13 of the main plant than the gas turbine generator sets 2.

[0037] Waste heat boiler 4 is arranged coaxially with gas turbine generator set 2, and waste heat boiler 4 is located outside column B of the gas turbine-steam turbine combined main plant 1. The two waste heat boilers 4 are also arranged in a mirror symmetrical arrangement with respect to the symmetrical center line 13 of the main plant.

[0038] A central control building 5 is located between the two waste heat boilers 4, outside column B of the gas turbine-steam turbine combined main plant 1.

[0039] In this embodiment, as Figure 1 As shown, the main gas turbine-steam turbine combined plant 1 houses two gas turbine generator sets 2 and two steam turbine generator sets 3. Each gas turbine generator set 2 has a waste heat boiler 4 coaxially arranged. One gas turbine generator set 2, one steam turbine generator set 3, and one waste heat boiler 4 constitute a gas-steam combined cycle unit. Figure 1 As shown, this embodiment has two gas-steam combined cycle units, and the two gas-steam combined cycle units share a central control building 5.

[0040] The gas turbine generator set 2 includes a gas turbine body 21 and a gas turbine generator 22, with the gas turbine body 21 connected to the gas turbine generator 22; The steam turbine generator set 3 includes a steam turbine body 31 and a steam turbine generator 32, with the steam turbine body 31 connected to the steam turbine generator 32; The waste heat boiler 4 includes a waste heat boiler body 41, a waste heat boiler feedwater pump room 42, and a waste heat boiler connecting flue 43. The waste heat boiler body 41 is connected to the waste heat boiler connecting flue 43 and the waste heat boiler feedwater pump room 42. The waste heat boiler connecting flue 43 is connected to the gas turbine body 21. The waste heat boiler feedwater pump room 42 is located on the side of the waste heat boiler body 41 close to the symmetrical center line 13 of the main plant. At this time, the waste heat boiler feedwater pump room 42 is also located between the waste heat boiler body 41 and the central control building 5. The waste heat boiler feedwater pump room 42 is connected to the steam turbine body 31.

[0041] The waste heat boiler feedwater pump house 42 is an important supporting building for the waste heat boiler 4. It contains major systems such as feedwater, main steam, thermal control, electrical, and chemical testing. The feedwater system and main steam system of the steam turbine generator set 3 are connected to the waste heat boiler feedwater pump house 42. The thermal control system and electrical system of the steam turbine generator set 3 are connected to the electrical system of the central control building 5, ensuring the connection between the waste heat boiler 4, the related systems of the steam turbine generator set 3, and the related systems of the central control building 5.

[0042] Each gas-steam combined cycle unit is equipped with a maintenance bay 11, which is located between the gas turbine generator unit 2 and the steam turbine generator unit 3.

[0043] Preferably, a short span 12 (the span of the short span 12 can be, but is not limited to, 1.2m-1.5m) is set near the symmetrical center line 13 of the main plant. The short span 12 faces the common buildings and structures such as the central control building 5. Within this span, the expansion joint of the main plant is arranged, and it also serves as the layout of the common systems in the main plant, forming convenient communication with the various common systems in the central control building 5. At the same time, this area serves as the centralized layout point for the valve stations of the two units. The valve stations of the two units are centrally arranged within this short span 12, which significantly improves the convenience and aesthetics of centralized valve operation and maintenance.

[0044] Reference Figure 2 and Figure 3 The main plant 1 of the gas turbine-steam turbine combined building has three platforms: the 0m level 6, the intermediate level 7, and the operating level 8. The 0m level 6 and the intermediate level 7 are used to house the auxiliary equipment and systems of the steam turbine generator set 3 and the gas turbine generator set 2 (i.e., the auxiliary equipment and systems of both the steam turbine generator set 3 and the gas turbine generator set 2). The operating level 8 is used to house both the steam turbine generator set 3 and the gas turbine generator set 2. Preferably, the auxiliary equipment and systems of both the steam turbine generator set 3 and the gas turbine generator set 2 are located on both the 0m level 6 and the intermediate level 7.

[0045] The lower part of the gas turbine body 21 is connected to the gas turbine inlet 25. The gas turbine inlet 25 is located on the 0m floor 6 of the main building of the gas turbine-steam turbine combined main building 1, and the gas turbine inlet 25 is located near column B of the gas turbine-steam turbine combined main building 1.

[0046] The gas turbine intake duct 25 is connected to the gas turbine intake device 24 in the direction of the waste heat boiler 4. The gas turbine body 21 is arranged on a base that is integrated with the gas turbine intake duct 25 (the top of the base is level with the main plant operating floor 8, that is, the gas turbine body 21 is arranged on the main plant operating floor 8).

[0047] The gas turbine body 21 is connected to a gas turbine exhaust duct 23, which discharges towards the waste heat boiler 4. The gas turbine exhaust duct 23 is connected to the waste heat boiler connecting flue 43. The gas turbine exhaust duct 23 is arranged above the gas turbine intake duct 25 and the gas turbine intake device 24, and it is connected to the waste heat boiler body 41 through the waste heat boiler connecting flue 43, forming a high-level lower intake arrangement.

[0048] The gas turbine generator 22 and the gas turbine body 21 are coaxially arranged on the main plant operating floor 8, and the gas turbine generator 22 is arranged near the gas turbine-steam turbine combined main plant 1A column, while the gas turbine body 21 is arranged near the gas turbine-steam turbine combined main plant 1B column.

[0049] The steam turbine generator 32 and the steam turbine body 31 are coaxially arranged on the main plant operating floor 8, with the steam turbine generator 32 located near column 1A of the combined gas turbine and steam turbine main plant, and the steam turbine body 31 located near column 1B of the combined gas turbine and steam turbine main plant.

[0050] The steam turbine body 31 is connected to the steam turbine condenser 33, which is located on the 0m floor 6 of the main plant. The steam turbine body 31 discharges steam downwards to the steam turbine condenser 33. The steam is discharged from the low-pressure cylinder on the main plant operating floor 8 to the steam turbine condenser 33 on the 0m floor 6 of the main plant using a downward discharge method, thus forming a high-level discharge arrangement.

[0051] Preferably, main plant crane brackets 9 are formed on the structural columns (concrete structure) of columns 1A and 1B of the gas turbine-steam turbine combined main plant building. Main plant crane tracks 10 are installed on the main plant crane brackets 9. Two main plant cranes 14 are arranged on the main plant crane tracks 10. The main plant cranes 14 have running mechanisms and lifting mechanisms.

[0052] In the symmetrical arrangement structure of the multi-shaft gas-steam combined cycle unit with a double high-level single-span main plant in this embodiment, the two gas-steam combined cycle units are arranged in a mirror-symmetrical manner about the symmetrical center line 13 of the main plant. Specifically, the two gas turbine generator sets 2, the steam turbine generator sets 3, and the waste heat boiler 4 are arranged in a mirror-symmetrical manner about the symmetrical center line 13 of the main plant. The gas turbine generator sets 2 and the steam turbine generator sets 3 are arranged in the single-span gas turbine-steam turbine combined main plant 1, and the waste heat boiler 4 is arranged outside column B of the gas turbine-steam turbine combined main plant 1. During the arrangement, the symmetrical center lines of the two gas turbine generator sets 2 coincide with the symmetrical center lines of the two steam turbine generator sets 3 (i.e., the symmetrical center line 13 of the main plant). The two gas turbine generator sets 2 are arranged on the outer side of the symmetrical center line 13 of the main plant, and the two steam turbine generator sets 3 are arranged on the inner side of the symmetrical center line 13 of the main plant. The symmetrical center lines of the two waste heat boilers 4 coincide with the symmetrical center lines of the two gas turbine generator sets 2. In this way, the gas turbine generator set 2 and the steam turbine generator set 3 are arranged symmetrically on the same floor of the combined gas turbine and steam turbine main plant 1, with the same elevation, resulting in strong overall integrity and facilitating operation and maintenance. Furthermore, the area between the waste heat boilers 4 of the two gas-steam combined cycle units can accommodate common buildings and systems such as the centralized control building 5, making the overall footprint smaller and the layout more compact. This improves the overall integrity of the main plant area and solves the problems of weak overall integrity, large footprint, and inconvenient operation and maintenance in existing multi-shaft gas-steam combined cycle unit main plant layouts.

[0053] In this embodiment, the waste heat boiler feedwater pump room 42 is arranged between the waste heat boiler body 41 and the central control building 5, which shortens the distance between the relevant control system in the waste heat boiler feedwater pump room 42 and the central control building 5, and facilitates the strengthening of communication between them.

[0054] In this embodiment, the combined gas turbine and steam turbine main plant 1 adopts a large-span single-span civil engineering structure, which can improve the space utilization rate of the main plant.

[0055] In this embodiment, the main plant 1 of the gas turbine-steam turbine combined building is equipped with a three-level platform: the 0m level 6, the intermediate level 7, and the operating level 8. The 0m level 6 and the intermediate level 7 are used to house the auxiliary equipment and systems of the steam turbine generator set 3 and the gas turbine generator set 2. The operating level 8 is used to house the steam turbine generator set 3 and the gas turbine generator set 2. The three-level platform provides excellent conditions for the dual high-level arrangement of the gas turbine generator set 2 and the steam turbine generator set 3, and together they form an advantage of efficient space utilization. At the same time, the unified operating level platform enables the sharing of the traveling equipment of the gas turbine generator set 2 and the steam turbine generator set 3. The space for placing large components during maintenance is better, improving the uniformity, convenience, and safety of operation and maintenance.

[0056] In this embodiment, the gas turbine generator set 2 adopts a high-level bottom air intake arrangement, and the steam turbine generator set 3 adopts a high-level bottom exhaust arrangement, forming a double-high-level main plant layout, which improves the space utilization rate in the height direction and significantly reduces the longitudinal length of the main plant, the total floor area, and the civil engineering cost.

[0057] In this embodiment, the gas turbine generator set 2 and the steam turbine generator set 3 of the two gas-steam combined cycle units and their auxiliary system equipment share two main plant cranes 14. The two main plant cranes 14 lift heavy components such as the gas turbine generator stator by using a dual-machine lifting mechanism.

[0058] In this embodiment, the two gas-steam combined cycle units are provided with a maintenance bay 11, and its maintenance passage enters and exits from the front row (i.e., column A, the side of the main plant away from the waste heat boiler 4) of the gas turbine-steam turbine combined main plant 1.

[0059] Preferably, the main plant operating floor 8 of the gas turbine-steam turbine combined main plant 1 has an elevation of 13m, and the intermediate floor 7 of the main plant has an elevation of 6.5m.

[0060] Preferably, the dimensions of the combined gas turbine and steam turbine main plant 1 are 139.8m × 44m.

[0061] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A symmetrical layout structure of a multi-shaft gas-steam combined cycle unit with a double-high-level single-span main plant, characterized in that: It includes a combined gas turbine and steam turbine main plant, in which gas turbine generator sets and steam turbine generator sets are arranged in a mirror-symmetrical manner. The gas turbine generator set has a waste heat boiler coaxially arranged outside the gas turbine-steam turbine combined main plant building. The waste heat boilers are also arranged in a mirror symmetrical manner, and a centralized control building is arranged between the waste heat boilers. The main plant building for the gas turbine-steam turbine combined unit consists of a ground floor, a middle floor, and an operating floor, arranged from bottom to top. The ground floor and middle floor are used to house the auxiliary equipment and systems of the steam turbine generator sets and the gas turbine generator sets, while the operating floor is used to house the steam turbine generator sets and the gas turbine generator sets.

2. The symmetrical layout structure of the multi-shaft gas-steam combined cycle unit with double high-level single-span main plant as described in claim 1, characterized in that: Both gas turbine generator sets and steam turbine generator sets are installed in pairs; The paired gas turbine generator sets and steam turbine generator sets are arranged in a mirror-symmetric manner about the center line of the main plant of the combined gas turbine and steam turbine main plant. The paired waste heat boilers are also arranged in a mirror-symmetric manner about the center line of the main plant of the combined gas turbine and steam turbine main plant. The paired steam turbine generator sets are arranged on both sides of the symmetrical center line of the main plant; the paired gas turbine generator sets are arranged on the outside of the steam turbine generator sets.

3. The symmetrical layout structure of the multi-shaft gas-steam combined cycle unit with double high-level single-span main plant as described in claim 1, characterized in that: The gas turbine generator set includes a gas turbine body and a gas turbine generator. The gas turbine body and the gas turbine generator are arranged coaxially and connected to each other. A steam turbine generator set includes a steam turbine body and a steam turbine generator. The steam turbine body and the steam turbine generator are arranged coaxially and connected to each other. The waste heat boiler includes the waste heat boiler body, the waste heat boiler feedwater pump room, and the waste heat boiler connecting flue. The waste heat boiler body is connected to the waste heat boiler connecting flue, the waste heat boiler body is connected to the waste heat boiler feedwater pump room, the waste heat boiler connecting flue is connected to the gas turbine body, and the waste heat boiler feedwater pump room is connected to the steam turbine body. The waste heat boiler feedwater pump room is located between the waste heat boiler body and the central control building.

4. The symmetrical layout structure of the multi-shaft gas-steam combined cycle unit with double high-level single-span main plant as described in claim 3, characterized in that: The lower part of the gas turbine body is connected to the gas turbine air intake, which is located on the ground floor of the main plant. The gas turbine intake duct connects to the gas turbine intake device in the direction of the waste heat boiler.

5. The symmetrical layout structure of the multi-shaft gas-steam combined cycle unit with double high-level single-span main plant as described in claim 4, characterized in that: The gas turbine body is connected to a gas turbine exhaust duct, which discharges towards the waste heat boiler. The gas turbine exhaust duct is located above the gas turbine intake duct and the gas turbine intake device, and it is connected to the waste heat boiler body through the waste heat boiler connecting flue.

6. The symmetrical layout structure of the multi-shaft gas-steam combined cycle unit with double high-level single-span main plant as described in claim 3, characterized in that: The steam turbine body is connected to the steam turbine condenser, which is located on the ground floor of the main plant.

7. The symmetrical layout structure of the multi-shaft gas-steam combined cycle unit with double high-level single-span main plant as described in claim 1, characterized in that: The gas turbine generator sets and steam turbine generator sets are arranged laterally in the combined gas turbine and steam turbine main plant.

8. The symmetrical layout structure of the multi-shaft gas-steam combined cycle unit with double high-level single-span main plant as described in claim 2, characterized in that: A gas turbine generator set, a steam turbine generator set, and a waste heat boiler constitute a gas-steam combined cycle unit; Each gas-steam combined cycle unit is equipped with a maintenance bay, which is located between the gas turbine generator set and the steam turbine generator set.

9. The symmetrical layout structure of the multi-shaft gas-steam combined cycle unit with double high-level single-span main plant as described in claim 1, characterized in that: The gas turbine-steam turbine combined main plant adopts a single span, with columns A and B on opposite sides of the gas turbine-steam turbine combined main plant. The span direction of the single span is from column A to column B. The waste heat boiler is arranged outside column B of the gas turbine-steam turbine combined main plant.

10. The symmetrical layout structure of the multi-shaft gas-steam combined cycle unit with double high-level single-span main plant as described in claim 9, characterized in that: The main plant building has overhead crane brackets formed on the structural columns of columns A and B of the gas turbine-steam turbine combined main plant building. The main plant building overhead crane tracks are installed on the overhead crane brackets. Two main plant building overhead cranes are arranged on the main plant building overhead crane tracks. The main plant building overhead cranes have running mechanisms and lifting mechanisms.

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