A high-level layout structure of a plant for a single-shaft gas-steam combined cycle generator set

Abstract

The present invention relates to a high-level plant layout structure for a single-shaft gas-steam combined cycle generator set, aiming to address the problems of inconvenient equipment overhaul and maintenance and high investment costs in the prior art. The structure provides a high-level plant layout structure for a single-shaft gas-steam combined cycle generator set, comprising a large-span, single-span main plant building having a first row of main columns, a first row of auxiliary columns, a second row of main columns, a second row of auxiliary columns, and a large-span grid roof. Within the main plant building are several single-shaft gas-steam combined cycle generator sets arranged in series and each connected to a waste heat boiler. The single-shaft gas-steam combined cycle generator set comprises a steam turbine and a gas turbine, with the gas turbine lower intake arranged at a high level, and the steam turbine lower exhaust arranged at a high level. A large-span crane is provided between the first and second rows of main columns. The main plant building is provided with a zero-meter floor, an intermediate floor, and an operating floor. The present invention has the beneficial effects of convenient equipment overhaul and maintenance, low investment costs for overhaul equipment, no blind spots for overhaul, and ample storage space.

Description

Technical Field

[0001] The present invention relates to the technical field of design and layout of a single-shaft gas-steam combined cycle power plant, and in particular to a plant high-level layout structure of a single-shaft gas-steam combined cycle generator set. Background Art

[0002] At present, some companies mostly adopt a low-level layout for the conventional design of the main plant of the 9H-class gas turbine single-shaft combined cycle unit. In this layout structure, each unit has an independent plant.

[0003] The high-level layout of the combined main plant is widely used in the 9F-class combined cycle units. The main plant of this scheme mostly adopts a double-span structure, and the unit shaft system is arranged in the following order: generator-steam turbine-gas turbine-waste heat boiler. For the high-level layout of the 9H-class gas turbine single-shaft combined cycle unit, if the high-level double-span main plant structure of the conventional 9F-class combined cycle unit is used, since the unit shaft system is arranged in the following order: steam turbine-generator-gas turbine-waste heat boiler, which is different from the shaft system arrangement order of the conventional 9F-class combined cycle unit, the generator of the 9HA gas turbine single-shaft combined cycle unit is arranged between the steam turbine and the gas turbine, and the middle row of columns of the high-level double-span main plant will cause inconvenience to the generator maintenance, and it is necessary to use a two-span crane to jointly lift a special lifting beam to realize the generator rotor extraction operation, which has the defects of complicated procedures and long maintenance cycle.

[0004] The high-rise double-span main factory building layout requires the establishment of maintenance lifting holes and large-scale transfer channels on both sides of the main factory building, which is not conducive to improving the space utilization rate of the main factory building. At the same time, the high-rise double-span main factory building layout has the problems of high civil construction cost and initial equipment investment. Summary of the Invention

[0005] The present invention aims to provide a high-position plant layout structure for a single-shaft gas-steam combined cycle generator set, so as to solve the problems of inconvenient equipment maintenance and high investment cost of the main plant and maintenance equipment in the existing main plant layout scheme.

[0006] The embodiment of the present invention is achieved as follows:

[0007] An embodiment of the present invention provides a high-level plant layout structure for a single-shaft gas-steam combined cycle generator set, which includes a main plant;

[0008] The main factory building is a single-span structure with a large span in the width direction. The main factory building has a first row of main columns, a first row of auxiliary columns, a second row of main columns, and a second row of auxiliary columns that are parallel to each other. The top of the main factory building has a large-span grid roof. The first row of main columns, the first row of auxiliary columns, the second row of main columns, and the second row of auxiliary columns are jointly supported by the lower part of the large-span grid roof.

[0009] Several sets of single-shaft gas-steam combined cycle generator sets are installed inside the main powerhouse. Several of the single-shaft gas-steam combined cycle generator sets have steam turbines, generators, gas turbines and auxiliary equipment.

[0010] Several of the above-mentioned single-shaft gas-steam combined cycle generator sets are arranged in series in the above-mentioned main powerhouse. The steam turbine, 3S clutch, generator, gas turbine and waste heat boiler are arranged in sequence on the shaft system of the above-mentioned single-shaft gas-steam combined cycle generator set. The shaft system of the above-mentioned single-shaft gas-steam combined cycle generator set is parallel to the width direction of the above-mentioned main powerhouse. The above-mentioned gas turbine adopts a lower air intake high position arrangement, and the above-mentioned steam turbine adopts a lower steam exhaust high position arrangement.

[0011] Several sets of waste heat boilers are arranged in series outside the main powerhouse. These waste heat boilers are adapted to the single-shaft gas-steam combined cycle generator sets. A waste heat boiler auxiliary room is provided on one side of the waste heat boiler. The waste heat boiler auxiliary room is connected to the main powerhouse via a boiler heat pipe gallery. A gas turbine pre-module is arranged on the side of the boiler heat pipe gallery.

[0012] A plurality of large-span cranes are provided between the first row of main columns and the second row of main columns, the main beams of the plurality of large-span cranes being parallel to the width direction of the main power building, and the main beams of the large-span cranes being movable along the length direction of the main power building, and the generator being located between the steam turbine and the gas turbine;

[0013] The above-mentioned main factory building is provided with a zero-meter floor, an intermediate floor and an operation floor along the height direction.

[0014] With such an arrangement, during maintenance, the large-span crane is slid to the area on the side of the generator, and then the rotor in the generator is lifted out using the large-span crane located between the first row of main columns and the second row of main columns in the main plant, thereby realizing the rotor extraction operation. This solution has simple procedures and convenient operation.

[0015] Optionally, in the operation layer, a large operation layer platform is located between the first row of main columns and the second row of main columns, and the large operation layer platform runs through the entire main plant;

[0016] The operating layer and the layers above between the first row of main columns and the first row of auxiliary columns are thermal pipe rack layers, where heating facilities, equipment and pipelines are arranged;

[0017] The operating layer and the layers above between the second row of main columns and the second row of auxiliary columns are thermal pipe rack layers, on which steam-water pipelines and natural gas pipelines are arranged.

[0018] This arrangement makes the maintenance and stacking area of the operating layer large, which can meet the maintenance and stacking needs of several or more units at the same time.

[0019] Optionally, in the middle layer, each unit between the first row of main columns and the second row of main columns is divided into four columns, the middle column being the combined cycle unit base, and the column to the right of the combined cycle unit base being provided with a phase-isolating busbar, which is connected from directly below the generator located on the operating layer and then leads to the first row of auxiliary columns of the main powerhouse through the column to the right of the combined cycle unit base;

[0020] The right side of the combined cycle unit base is also equipped with a lubricating oil container module; the first left side of the combined cycle unit base is the pipeline room, in which steam and water pipelines and auxiliary equipment are arranged;

[0021] The first row of main columns on the second row on the left side of the combined cycle unit base close to the main powerhouse are the maintenance lifting holes, and the second row of main columns close to the main powerhouse are the 380V power distribution room and the electronic equipment room respectively;

[0022] An electrical relay room, a DC and UPS device room and a battery room are arranged between the first row of main columns and the first row of auxiliary columns in the above-mentioned middle layer; a first HVAC room and part of the steam and water pipelines are arranged between the second row of main columns and the second row of auxiliary columns in the above-mentioned middle layer.

[0023] Optionally, in the zero-meter layer, each unit between the first row of main columns and the second row of main columns is divided into four columns, the middle column being the base of the combined cycle unit; the column to the right of the base of the combined cycle unit is sequentially arranged with a reactor room, a power distribution room for a variable frequency starting device, an excitation equipment room, a fire cylinder room, and a closed cooling water booster pump group;

[0024] The first column on the left side of the combined cycle unit base is the steam-water pipeline room; the first row of main columns on the second left side of the combined cycle unit base close to the main powerhouse are the maintenance lifting holes, and the second row of main columns close to the main powerhouse are the gas turbine power distribution room, 6kV power distribution room, and the second HVAC room respectively;

[0025] Between the first row of main columns and the first row of auxiliary columns in the zero-meter layer are arranged a maintenance transfer channel, an open cooling water electric filter, a closed cooling water heat exchanger, a vacuum pump unit, and a variable frequency starting device isolation transformer;

[0026] A condensate polishing device and part of the steam-water pipeline are arranged between the second row of main columns and the second row of auxiliary columns in the zero-meter layer.

[0027] Optionally, a boom crane is provided below the main beam of the large-span crane.

[0028] Such an arrangement can cover the area outside the limit range of the hook of the above-mentioned large-span crane, further expanding the maintenance range of the above-mentioned large-span crane.

[0029] Optionally, each unit in the main plant is provided with an inspection and lifting hole near the first row of main columns.

[0030] With this arrangement, large components for maintenance can be transferred to the outside of the above-mentioned first row of main columns of the main plant through the above-mentioned maintenance lifting holes, and there is no need to set up maintenance lifting holes in the area close to the main plant and the above-mentioned second row of main columns. This can improve the space utilization efficiency of the main plant, and there is no need to consider the transfer channel of large components for maintenance to the direction outside the above-mentioned second row of main columns in the main plant. This can reduce the distance between the axes of several sets of units, which is conducive to reducing the floor area of the above-mentioned main plant area.

[0031] Optionally: several of the above-mentioned single-shaft gas-steam combined cycle generator sets are arranged at a high position.

[0032] With this arrangement, compared with the conventional low-level layout, the high-level layout of the main factory building can reduce the floor area of the main factory building and improve space utilization.

[0033] Optionally, the gas turbine, the steam turbine and the generator are all located in the same main plant building and can be inspected and maintained via the large-span crane.

[0034] Such an arrangement improves the utilization efficiency of the above-mentioned large-span cranes while reducing the number of the above-mentioned large-span cranes, which can effectively reduce the initial investment in maintenance equipment.

[0035] Optionally, the large operating platform between the first row of main columns and the second row of main columns is not blocked by any intermediate columns.

[0036] This configuration provides a wide driving coverage area, no blind spots for inspection, large platform stacking space, and unobstructed internal viewing.

[0037] Optionally: the generator is inspected and maintained by sliding.

[0038] With this arrangement, there is no need to use the large-span crane to lift the stator of the generator to the designated maintenance area, which reduces the requirement for the lifting capacity of the large-span crane and can significantly reduce the initial investment in maintenance equipment.

[0039] Based on the above description, the high-position layout structure of the plant for a single-shaft gas-steam combined cycle power generation unit disclosed in the present invention has the beneficial effects of convenient equipment inspection and maintenance in the main plant layout scheme, low investment cost of the main plant and inspection equipment, no intermediate columns blocking the operating floor of the main plant, no blind spots for inspection, large stacking space and unobstructed internal appearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0041] Figure 1 : shows a cross-sectional schematic diagram of a plant high-level layout structure of a single-shaft gas-steam combined cycle generator set according to an embodiment of the present invention;

[0042] Figure 2 : A schematic diagram of the operating layer in an embodiment of the present invention is shown in FIG.

[0043] Figure 3 : A schematic diagram of the intermediate layer in an embodiment of the present invention is shown;

[0044] Figure 4 Schematic diagram of the zero-meter layer in an embodiment of the present invention is shown in FIG.

[0045] Icons: 1- Main plant, 2- First row of main columns, 3- First row of auxiliary columns, 4- Second row of main columns, 5- Second row of auxiliary columns, 6- Large span grid roof, 7- Zero meter floor, 8- Middle floor, 9- Operation floor, 10- Single shaft gas steam combined cycle generator set, 11- Steam turbine, 12- Auxiliary steam header, 13- Closed expansion tank, 14- Vacuum pump group, 15- Closed cooling water heat exchanger, 16, Open cooling water electric water filter, 17- Closed cooling water booster pump group, 18- Lubricating oil container module, 19- Condenser, 20- Generator, 21- Generator phase bus, 22- Frequency conversion starting device isolation transformer, 23- Side sliding maintenance area, 30- Gas turbine, 31- Gas turbine front module, 32- Gas turbine air intake module, 33- Gas turbine air intake duct, 40- Waste heat Boiler, 41-waste heat boiler auxiliary room, 50-3S clutch, 60-large span crane, 61-jib crane, 70-heating steam header, 80-condensate polishing device, 101-maintenance lifting hole, 102-maintenance transfer channel, 103-pipeline room, 111-gas turbine power distribution room, 112-6kV power distribution room, 113-first HVAC room, 114-reactor room, 115-variable frequency starting device power distribution room, 116-excitation equipment room, 117-fire cylinder room, 118-380V power distribution room, 119-electronic equipment room, 120-electrical relay room, 121-DC and UPS device room, 122-battery room, 124-second HVAC room, 125-thermal control maintenance room, 130-combined cycle unit base, 141-boiler thermal corridor. DETAILED DESCRIPTION

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0047] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0048] Example 1

[0049] See also Figure 1 、 Figure 2 、 Figure 3 and Figure 4 ,This embodiment proposes a plant high-position layout structure of a single-shaft gas-steam combined cycle generator set, including a main plant 1;

[0050] The main plant 1 is a single-span structure with a large span along the width direction. The main plant 1 has a first row of main columns 2, a first row of auxiliary columns 3, a second row of main columns 4, and a second row of auxiliary columns 5 that are parallel to each other. The top of the main plant 1 has a large-span grid roof 6. The first row of main columns 2, the first row of auxiliary columns 3, the second row of main columns 4, and the second row of auxiliary columns 5 are jointly supported by the lower part of the large-span grid roof 6, and together enclose a large-span main plant with an unobstructed, transparent and beautiful center.

[0051] Several sets of single-shaft gas-steam combined cycle generator sets 10 are installed inside the main powerhouse 1. Each of the single-shaft gas-steam combined cycle generator sets 10 includes a steam turbine 11, a generator 20, a gas turbine 30 and auxiliary equipment.

[0052] Several single-shaft gas-steam combined cycle generator sets 10 are arranged in series within the main powerhouse 1. The steam turbine 11, 3S clutch 50, generator 20, gas turbine 30, and waste heat boiler 40 are sequentially arranged on the shaft system of the single-shaft gas-steam combined cycle generator sets 10. The shaft system of the single-shaft gas-steam combined cycle generator sets 10 is parallel to the width of the main powerhouse. The gas turbine 30 adopts a lower intake and high position arrangement, and the steam turbine 11 adopts a lower exhaust and high position arrangement. Compared with the conventional low position arrangement, the high position arrangement of the main powerhouse can reduce the main powerhouse floor space and improve space utilization.

[0053] Several sets of waste heat boilers 40 are arranged in series outside the main powerhouse 1. These waste heat boilers 40 are adapted to several single-shaft gas-steam combined cycle generator sets 10. A waste heat boiler auxiliary room 41 is provided on one side of the waste heat boiler 40. The waste heat boiler auxiliary room 41 is connected to the main powerhouse 1 via a boiler heat pipe gallery 141. A gas turbine pre-module 31 is arranged on the side of the boiler heat pipe gallery 141.

[0054] Several large-span cranes 60 are arranged between the first row of main columns 2 and the second row of main columns 4. The main beams of the several large-span cranes 60 are parallel to the width direction of the main plant 1. The main beams of the large-span cranes 60 move along the length direction of the main plant 1. The generator 20 is located between the steam turbine 11 and the gas turbine 30; the main plant 1 is provided with a zero-meter layer 7, an intermediate layer 8 and an operating layer 9 along the height direction. During maintenance, the large-span crane 60 is slid to the area on the side of the generator 20, and the rotor in the generator is lifted out using the large-span crane 60 located between the first row of main columns 2 and the second row of main columns 4 in the main plant 1, thereby realizing the rotor extraction operation. This solution has simple procedures and convenient operation.

[0055] See also Figure 1 、 Figure 2 、 Figure 3 and Figure 4 In the operating layer 9, the operating layer platform is located between the first row of main columns 2 and the second row of main columns 4, and the operating layer platform runs through the entire main plant 1; the operating layer 9 and the layers above between the first row of main columns 2 and the first row of auxiliary columns 3 are thermal pipe rack layers, where heating facilities, equipment and pipelines are arranged; the operating layer 9 and the layers above between the second row of main columns 4 and the second row of auxiliary columns 5 are thermal pipe rack layers, where steam-water pipelines and natural gas pipelines are arranged. This makes the maintenance and stacking area of the operating layer 9 large, which can meet the maintenance and stacking needs of several or more units at the same time.

[0056] In the middle layer 8, each unit is divided into four columns between the first row of main columns 2 and the second row of main columns 4. The middle column is the combined cycle unit base 130. The column to the right of the combined cycle unit base 130 is equipped with a phase-isolating busbar 21. The phase-isolating busbar 21 is connected from directly below the generator 20 located on the operation layer 9, and then leads to the first row of auxiliary columns 3 of the main power building 1 through the column to the right of the combined cycle unit base 130.

[0057] The right column of the combined cycle unit base 130 is also equipped with a lubricating oil container module 18; the first column on the left side of the combined cycle unit base 130 is the pipeline room 103, in which steam and water pipelines and auxiliary equipment are arranged;

[0058] The first row of main columns 2 in the second row on the left side of the combined cycle unit base 130, close to the main power building 1, are the maintenance lifting holes 101. The second row of main columns 4 close to the main power building 1 are the 380V power distribution room 118 and the electronic equipment room 119.

[0059] An electrical relay room 120, a DC and UPS device room 121 and a battery room 122 are arranged between the first row of main columns 2 and the first row of auxiliary columns 3 in the middle layer 8; a first HVAC room 113 and some steam and water pipelines are arranged between the second row of main columns 4 and the second row of auxiliary columns 5 in the middle layer 8.

[0060] On the zero-meter floor 7, each unit is divided into four columns between the first row of main columns 2 and the second row of main columns 4. The middle column is the combined cycle unit base 130. The column to the right of the combined cycle unit base 130 is equipped with a reactor room 114, a variable frequency starting device distribution room 115, an excitation equipment room 116, a fire cylinder room 117, and a closed cooling water booster pump unit 17.

[0061] The first column on the left side of the combined cycle unit base 130 is the piping room 103; the first row of main columns 2 on the second row on the left side of the combined cycle unit base 130, close to the main power building 1, are the maintenance lifting holes 101; the second row of main columns 4, close to the main power building 1, are the gas turbine power distribution room 111, the 6kV power distribution room 112, and the second HVAC room 124.

[0062] Between the first row of main columns 2 and the first row of auxiliary columns 3 in the zero-meter layer 7, there are arranged in sequence a maintenance transfer channel 102, an open cooling water electric water filter 16, a closed cooling water heat exchanger 15, a vacuum pump group 14 and a variable frequency starting device isolation transformer 22;

[0063] A condensate polishing device 80 and part of the steam-water pipeline are arranged between the second row of main columns 4 and the second row of auxiliary columns 5 in the zero-meter layer 7.

[0064] A boom crane 61 is provided below the main beam of the large-span crane 60 , which can cover the area outside the limit range of the hook of the large-span crane 60 , further expanding the maintenance range of the large-span crane 60 .

[0065] Each unit in the main plant 1 is provided with an inspection lifting hole 101 near the first row of main columns 2. Large components for inspection can be transferred to the outside of the first row of main columns 2 of the main plant 1 through the inspection lifting hole 101. There is no need to set up inspection lifting holes in the area near the main plant 1 and the second row of main columns 4. This can improve the space utilization efficiency of the main plant, and there is no need to consider the transportation channel of large components for inspection to the direction outside the second row of main columns 4 in the main plant 1. This can reduce the distance between the axes of several sets of units, which is conducive to reducing the floor area of the main plant area.

[0066] Several single-shaft gas-steam combined cycle generator sets 10 are all arranged at a high position. Compared with the conventional low position arrangement, the high position arrangement of the main plant 1 can reduce the floor area of the main plant and improve space utilization.

[0067] The gas turbine 30, steam turbine 11 and generator 20 are all located in the same main plant 1 and are maintained by a large-span crane 60. This improves the utilization efficiency of the large-span crane 60 while reducing the number of large-span cranes 60, which can effectively reduce the initial investment in maintenance equipment.

[0068] The large operating platform between the first row of main columns 2 and the second row of main columns 4 has no intermediate columns to block it, and has a wide driving coverage area, no blind spots for maintenance, a large platform stacking space, and an unobstructed internal appearance.

[0069] The generator adopts a side-sliding maintenance method, which eliminates the need to use a large-span crane 60 to lift the generator stator to the designated maintenance area, reducing the lifting weight requirements of the large-span crane 60 and significantly reducing the initial investment in maintenance equipment.

[0070] Example 2

[0071] There is another implementation method based on Example 1:

[0072] The main power building 1 houses at least two single-shaft gas-steam combined cycle generator sets 10, each comprising a steam turbine 11, a 3S clutch 50, a generator 20, a gas turbine 30, and auxiliary equipment. The main power building 1 has a single-span structure with a wide span. The first row of main columns 2, the first row of auxiliary columns 3, the second row of main columns 4, the second row of auxiliary columns 5, and the long-span grid roof 6 form an unobstructed, transparent, and aesthetically pleasing long-span main power building. The main power building is structured vertically with a zero-meter floor 7, an intermediate floor 8, and an operating floor 9.

[0073] The arrangement of main columns and auxiliary columns in the main factory building 1 can provide more space for the layout of equipment, pipelines and auxiliary rooms. Compared with the single-span main factory building structure with only two rows of main columns and no auxiliary columns, it can significantly reduce the cross-section of the main factory building's structural beams and columns, thereby improving structural stability and effectively reducing civil engineering costs.

[0074] On the operation floor 9 of the main power building 1, a large operation floor platform is located between the first row of main columns 2 and the second row of main columns 4 of the main power building 1. The operation floor 9 and the floors above between the first row of main columns 2 and the first row of auxiliary columns 3 are thermal pipe rack floors, where auxiliary steam headers 12, heating steam headers 70, closed expansion water tanks 13, heating pipes and other steam-water pipes are arranged. The operation floor 9 and the floors above between the second row of main columns 4 and the second row of auxiliary columns 5 of the main power building operation floor are thermal pipe rack floors, where thermal control maintenance rooms 125, steam-water pipes, natural gas pipes and other pipes are arranged.

[0075] Two large-span cranes 60 are installed between the first row of main columns 2 and the second row of main columns 4. The main beams of the large-span cranes 60 are parallel to the width direction of the main plant 1. The main beams of the large-span cranes 60 move along the length direction of the main plant 1 to achieve coverage of the main plant 1 by the large-span cranes 60; the gas turbine 30, the steam turbine 11 and the generator 20 can use the large-span cranes 60 of the main plant 1 for maintenance at the same time, which improves the efficiency of crane use while reducing the number of large-span cranes 60, and can effectively reduce the initial investment in maintenance equipment; the large platform on the operating floor has no intermediate columns between the first row of main columns 2 and the second row of main columns 4, with a wide crane coverage range, no blind spots for maintenance, a large platform stacking space, and an unobstructed internal appearance.

[0076] Furthermore, the generator 20 is located between the steam turbine 11 and the gas turbine 30. During maintenance, it is moved to the side sliding maintenance area 23 of the generator 20 through the side sliding device, and then the rotor of the generator 20 is lifted out using the large-span crane 60 located between the first row of main columns 2 and the second row of main columns 4 of the main plant 1, thereby realizing the rotor extraction operation. This solution has simple procedures and convenient operation.

[0077] The generator side-sliding maintenance method eliminates the need to use a large-span crane 60 to lift the stator of the generator 20 to the designated maintenance area, which reduces the lifting capacity requirement of the large-span crane 60 and can significantly reduce the initial investment in maintenance equipment. Furthermore, the rotor maintenance method of the generator 20 solves the problem of complicated procedures and long maintenance cycles caused by the conventional double-span main plant building, which can only achieve the generator rotor extraction operation by using two cranes located in the two spans to jointly lift a special lifting beam.

[0078] The maintenance lifting hole 101 is capable of inspecting large components, which can be transferred to the outside of the first row of main columns 2 of the main plant 1 through the maintenance lifting hole 101 and the maintenance transfer channel 102 located at the zero-meter floor 7 of the main plant 1. There is no need to set up additional maintenance lifting holes in the area near the second row of main columns 4 of the main plant 1. Compared with the conventional double-span main plant layout that requires a maintenance lifting hole 101 to be set up at the first row of main columns 2 and the second row of main columns 4 of the main plant 1, the zero-meter floor 7 and the middle floor 8 of the main plant 1 have more space to arrange electrical auxiliary rooms and other equipment, thereby improving the space utilization rate of the main plant 1. Furthermore, there is no need to consider the transfer channel for inspecting large components to the outside of the second row of main columns 4 of the main plant, which can reduce the distance between the axes of the two sets of units, which is conducive to reducing the floor area of the main plant area.

[0079] In the middle layer 8 of the main power building, the gas turbine 30 area is arranged with a gas turbine cover, and the generator area is arranged with a phase-isolating busbar 21. The phase-isolating busbar 21 is connected from the bottom of the generator 20 located on the operating floor, and then leads to the first row of auxiliary columns 3 of the main power building through the right column of the combined cycle unit base 130; in addition to the phase-isolating busbar 21, the right column of the combined cycle unit base 130 also has equipment such as the lubricating oil container module 18; the first column on the left side of the combined cycle unit base 130 is the pipeline room 103, which is arranged with steam-water pipelines and auxiliary equipment; the second column on the left side of the combined cycle unit base 130, close to the first row of main columns 2 of the main power building, is the maintenance lifting hole 101, and the remaining space is 380V distribution room 118, electronic equipment room 119 and other electrical control auxiliary rooms. The electrical control auxiliary rooms such as the electrical relay room 120, the DC and UPS device room 121, and the battery room 122 are arranged between the first row of main columns 2 and the first row of auxiliary columns 3 on the middle floor of the main plant building; the first HVAC room 113 and some steam-water pipelines are arranged between the second row of main columns 4 and the second row of auxiliary columns 5 on the middle floor 8 of the main plant building.

[0080] On the zero-meter floor 7 of the main power building, the first row of main columns 2 and the second row of main columns 4 are divided into four columns for each unit. The middle column is the combined cycle unit base 130. The steam turbine area is equipped with a condenser 19 and a drain expansion tank platform. The generator area is equipped with a stator cooling water device and other generator auxiliary equipment. The gas turbine area is the gas turbine inlet duct 33 enclosed by a concrete base. On the right side of the combined cycle unit base 130 (looking towards the waste heat boiler 40 from the gas turbine 30), a column is arranged with the reactor room 114 and the variable frequency starting device power distribution board. The first row on the left side of the combined cycle unit base 130 houses the piping room 103, which houses steam-water piping and auxiliary equipment. The second row on the left side of the combined cycle unit base 130, near the first row of main columns 2 in the main powerhouse, houses the maintenance transfer passage 102 beneath the maintenance lifting holes 101. The remaining space houses the 6kV power distribution room 112, the gas turbine power distribution room 111, and the second HVAC room 124. On the ground floor of the main powerhouse, between the first row of main columns 2 and the first row of auxiliary columns 3, are located the vacuum pump unit 14, the closed-loop cooling water heat exchanger 15, the open-loop cooling water electric filter 16, and the variable frequency starting device isolation transformer 22. On the ground floor of the main powerhouse, between the second row of main columns 4 and the second row of auxiliary columns 5, are located the condensate polishing unit 80 and some steam-water piping. In the waste heat boiler area outside the main power building, a gas turbine air intake module 32 is arranged outside the second row of auxiliary columns 5 of the main power building; on the left side of the waste heat boiler 40 is the waste heat boiler auxiliary room 41, and between the waste heat boiler auxiliary room 41 and the main power building 1 is arranged a boiler thermal pipe gallery 141, and next to the boiler thermal pipe gallery 141 is the gas turbine front module 31.

[0081] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. A high-level layout structure for a single-shaft gas-steam combined cycle generator set, characterized by: Including the main factory building; The main factory building has a single-span structure with a large span in the width direction, and has a first row of main columns, a first row of auxiliary columns, a second row of main columns, and a second row of auxiliary columns that are parallel to each other. The top of the main factory building has a large-span grid roof, and the first row of main columns, the first row of auxiliary columns, the second row of main columns, and the second row of auxiliary columns jointly support the lower part of the large-span grid roof. Several sets of single-shaft gas-steam combined cycle generator sets are installed inside the main powerhouse, and several of the single-shaft gas-steam combined cycle generator sets have steam turbines, generators, gas turbines and auxiliary equipment; Several single-shaft gas-steam combined cycle generator sets are arranged in series in the main powerhouse. The steam turbine, 3S clutch, generator, gas turbine and waste heat boiler are arranged in sequence on the shaft system of the single-shaft gas-steam combined cycle generator set. The shaft system of the single-shaft gas-steam combined cycle generator set is parallel to the width direction of the main powerhouse. The gas turbine adopts a lower air intake high position arrangement, and the steam turbine adopts a lower exhaust high position arrangement. Several sets of waste heat boilers are arranged in series outside the main powerhouse, and the several sets of waste heat boilers are adapted to the several single-shaft gas-steam combined cycle generator sets. A waste heat boiler auxiliary room is provided on one side of the waste heat boiler, and the waste heat boiler auxiliary room is connected to the main powerhouse through a boiler heat pipe gallery, and a gas turbine front module is arranged on the side of the boiler heat pipe gallery; A plurality of large-span cranes are arranged between the first row of main columns and the second row of main columns, the main beams of the large-span cranes are parallel to the width direction of the main powerhouse, and the main beams of the large-span cranes move along the length direction of the main powerhouse, and the generator is located between the steam turbine and the gas turbine; The main factory building is provided with a zero-meter floor, an intermediate floor and an operation floor along the height direction; In the operation layer, a large operation layer platform is located between the first row of main columns and the second row of main columns, and the large operation layer platform runs through the entire main factory building; The operating layer and the layers above between the first row of main columns and the first row of auxiliary columns are thermal pipe rack layers, where heating facilities, equipment and pipelines are arranged; The operating layer and the layer above between the second row of main columns and the second row of auxiliary columns are thermal pipe rack layers, where steam and water pipes and natural gas pipes are arranged; In the middle layer, each unit between the first row of main columns and the second row of main columns is divided into four columns. The middle column is the base of the combined cycle unit. The column on the right side of the combined cycle unit base is provided with a phase-isolating busbar. The phase-isolating busbar is connected from directly below the generator located on the operating layer and then leads to the first row of auxiliary columns of the main powerhouse through the column on the right side of the combined cycle unit base. The right side of the combined cycle unit base is also equipped with a lubricating oil container module; the first left side of the combined cycle unit base is a pipeline room, in which steam and water pipelines and auxiliary equipment are arranged; The first row of main columns on the second row on the left side of the combined cycle unit base close to the main powerhouse are the maintenance lifting holes, and the second row of main columns close to the main powerhouse are the 380V distribution room and the electronic equipment room respectively; An electrical relay room, a DC and UPS device room, and a battery room are arranged between the first row of main columns and the first row of auxiliary columns on the middle layer; A first HVAC room and part of the steam and water pipelines are arranged between the second row of main columns and the second row of auxiliary columns in the middle layer; In the zero-meter layer, each unit between the first row of main columns and the second row of main columns is divided into four columns, the middle column is the base of the combined cycle unit; the right column of the combined cycle unit base is sequentially arranged with the reactor room, the variable frequency starting device distribution room, the excitation equipment room, the fire cylinder room and the closed cooling water booster pump group; The first column on the left side of the combined cycle unit base is the steam-water pipeline room; the first row of main columns on the second row on the left side of the combined cycle unit base close to the main powerhouse are the maintenance lifting holes, and the second row of main columns close to the main powerhouse are the gas turbine power distribution room, 6kV power distribution room, and the second HVAC room. Between the first row of main columns and the first row of auxiliary columns in the zero-meter layer, there are arranged in sequence an inspection and transfer channel, an open cooling water electric water filter, a closed cooling water heat exchanger, a vacuum pump group and a variable frequency starting device isolation transformer; A condensate polishing device and part of the steam-water pipeline are arranged between the second row of main columns and the second row of auxiliary columns in the zero-meter layer.

2. The high-level layout structure of a plant for a single-shaft gas-steam combined cycle generator set according to claim 1, characterized in that: A boom crane is provided below the main beam of the large-span crane.

3. The high-level layout structure of a plant for a single-shaft gas-steam combined cycle generator set according to claim 1, characterized in that: Each unit in the main plant is provided with an inspection and lifting hole near the first row of main columns.

4. The high-level layout structure of a plant for a single-shaft gas-steam combined cycle generator set according to claim 1, characterized in that: Several of the single-shaft gas-steam combined cycle generator sets are arranged at a high position.

5. The high-level layout structure of a plant for a single-shaft gas-steam combined cycle power generation unit according to claim 1, characterized in that: The gas turbine, the steam turbine and the generator are all located in the same main plant and can be inspected and maintained via the large-span crane.

6. The high-level layout structure of a plant for a single-shaft gas-steam combined cycle power generation unit according to claim 1, characterized in that: The large operating platform between the first row of main columns and the second row of main columns is not blocked by any intermediate columns.

7. The high-level layout structure of a plant for a single-shaft gas-steam combined cycle generator set according to claim 1, characterized in that: The generator adopts a side sliding maintenance method.

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