Seamless structure and seamless design method of main building of gas-steam combined cycle power plant

Abstract

The present invention relates to the technical field related to energy stations, and specifically to a seamless structure and a seamless design method for a main plant building of a gas-steam combined cycle power plant, wherein the seamless structure of the main plant building of the gas-steam combined cycle power plant is arranged in the middle of the combined plant building; wherein the combined plant building is symmetrically arranged, and each side is divided into a plurality of equipment layout areas; a post-cast strip is arranged in the middle maintenance span of the combined plant building; a gas turbine unit and a steam unit are arranged in the equipment layout area, and a waste heat utilization unit is arranged on the outer side of the combined plant building, and the waste heat utilization unit is connected to the gas turbine unit, and the equipment layout area includes a distribution area communicating with the gas turbine unit and the steam unit; a roof truss is arranged on the top of the combined plant building, and a ventilation unit is arranged on the roof truss for ventilating the equipment layout area; double columns are eliminated, an expansion joint is reduced, the length of the main plant building is shortened, the main plant building indicators are optimized, the engineering volume of a concrete frame is saved, and the room can be arranged more flexibly.

Description

Technical Field

[0001] The present invention relates to the technical field related to energy stations, and in particular to a seamless structure and a seamless design method for a main plant building of a gas-steam combined cycle power plant. Background Art

[0002] The main plant of a gas-steam combined cycle power plant is one of the core buildings of the power plant, where the main equipment and main thermal system process pipelines, cables, etc. are centrally arranged. In terms of design and optimization, the rationality of the layout of the main plant directly affects the building volume, the layout of process pipelines, and the overall energy efficiency and production capacity.

[0003] A gas-steam combined cycle distributed energy station is usually composed of a gas turbine, a steam turbine and a waste heat boiler. The waste heat boiler is arranged outdoors, and the gas turbine and steam turbine are usually arranged indoors. The arrangement can be coaxial gas turbine and steam turbine, or multi-axis (parallel arrangement). The gas turbine and steam turbine can be arranged in different plants or in the same plant. For distributed energy stations, due to the small output (i.e. the total amount of electric energy provided by the distributed energy system (such as photovoltaic, wind power, etc.) to the power grid or load at a certain moment or for a period of time), it is usually arranged in parallel in the same main plant with multiple axes of gas turbine and steam turbine. At this time, the main plant is usually called a joint plant. The length of a single gas turbine and steam turbine joint plant is about 60m and the width is about 35m. When two sets of units are newly built, the length of the main plant is usually about 120m.

[0004] At present, the maximum spacing of longitudinal temperature expansion joints of reinforced concrete frame structures should not exceed 75m for cast-in-place structures and 100m for prefabricated structures. When the length of the unit exceeds the temperature expansion joint spacing limit by a large margin, in order to ensure the safety and economy of the structure, it is advisable to add an expansion joint in the middle of the unit.

[0005] However, installing double columns will lengthen the main factory building by about 1m, and will increase the concrete frame. More structural columns are not conducive to room layout, and adding an expansion joint will increase the work of joint processing and increase the risk of water leakage. Summary of the invention

[0006] The object of the present invention is to provide a seamless structure and a seamless design method for a main building of a gas-steam combined cycle power plant, so as to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] The main plant of the gas-steam combined cycle power plant has a seamless structure and is located in the middle of the combined plant;

[0009] The combined plant is symmetrically arranged, with each side divided into multiple equipment layout areas;

[0010] A post-cast strip is arranged in the middle maintenance bay of the combined workshop;

[0011] A gas turbine unit and a steam turbine unit are arranged in the equipment layout area. A waste heat utilization unit is arranged on the external bracing of the combined workshop. The waste heat utilization unit is connected to the gas turbine unit. The equipment layout area includes a power distribution area that communicates with the gas turbine unit and the steam turbine unit;

[0012] A roof truss is arranged on the top of the combined workshop, and a ventilation unit is arranged on the roof truss for ventilating the equipment layout area.

[0013] As a further scheme of the present invention: The post-cast strip is arranged at the 1 / 3 position of the middle maintenance bay of the combined workshop.

[0014] As a further scheme of the present invention: The equipment layout area includes a gas turbine room and a steam turbine room. The gas turbine unit is arranged in the gas turbine room, and the steam turbine unit is arranged in the steam turbine room. A gas turbine maintenance site is arranged adjacent to the gas turbine room, and a steam turbine maintenance site is arranged adjacent to the steam turbine room. There are no beams on the intermediate floor and the operating floor in the middle parts of the two gas turbine rooms on both sides.

[0015] As a further scheme of the present invention: The gas turbine unit includes a gas turbine arranged in the gas turbine room. The exhaust end of the gas turbine is connected to the intake end of the waste heat utilization unit through a flue and a pipeline, so that high-temperature waste gas is introduced into the waste heat utilization unit for heating.

[0016] As a further scheme of the present invention: The waste heat utilization unit includes a waste heat boiler. The waste heat boiler is located outside the combined workshop. The intake end of the waste heat boiler is connected to the exhaust end of the gas turbine, and the steam generated in the waste heat boiler forms a cycle with the steam turbine unit.

[0017] As a further scheme of the present invention: The steam turbine unit includes a steam turbine arranged in the steam turbine room. The steam outlet of the waste heat boiler is connected to the steam turbine through a pipeline to form a combined cycle route. A steam turbine generator outgoing line room is also arranged in the combined workshop.

[0018] As a further scheme of the present invention: The power distribution area includes a 380KV working power distribution room, a gas turbine generator outgoing line room, an excitation transformer room, a current-limiting reactor room, and an SFC room. The gas turbine generator outgoing line room, the excitation transformer room, the current-limiting reactor room, and the SFC room are distributed in a "field" shape.

[0019] As a further solution of the present invention: the ventilation unit includes a roof ventilator installed on the roof truss, and a ventilation system is provided in the combined factory building to promote air circulation in the combined factory building.

[0020] The seamless design method of the main plant of a gas-steam combined cycle power plant adopts the seamless structure, cancels the double columns next to the middle maintenance span of the combined plant, sets a construction post-cast strip at the maintenance span, and at the same time, reduces the arrangement of the bottom longitudinal beams of the engine rooms on both sides, and does not set beams in the middle layer and the operating layer of the engine rooms on both sides, and only sets beams on the roof layer.

[0021] Compared with the prior art, the invention has the following beneficial effects:

[0022] The total length of the distributed energy station joint plant is about 120m, and the steam turbine room with multi-layer floor slabs is located in the middle of the plant, and its length is only about 60m. The gas turbine rooms on both sides are single-layer plants without floor slabs, so the temperature stress generated by the entire plant is relatively small;

[0023] The goal of eliminating expansion joints can be achieved through detailed structural calculations and reliable structural measures (such as setting post-casting strips, changing the layout of bottom longitudinal beams, etc.);

[0024] By eliminating double columns and reducing one expansion joint, the length of the main factory building can be shortened, the main factory building indicators can be optimized, the amount of work on the concrete frame can be saved, and the rooms can be arranged more flexibly. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a plan view of the ±0.000m layer of the main building in an embodiment of the seamless structure of the main building of a gas-steam combined cycle power plant.

[0026] Figure 2 The present invention is a plan view of the 4,500m floor of the main power building in one embodiment of the seamless structure of the main power building of a gas-steam combined cycle power plant.

[0027] Figure 3 The present invention is a plan view of the 8.500m floor of the main power building in one embodiment of the seamless structure of the main power building of a gas-steam combined cycle power plant.

[0028] Figure 4 The top floor plan of the main plant building in one embodiment of the seamless structure of the main plant building of a gas-steam combined cycle power plant.

[0029] Figure 5 The cross-sectional view of the main plant building in one embodiment of the seamless structure of the main plant building of a gas-steam combined cycle power plant.

[0030] Figure 6 The present invention is a cross-sectional view in another direction of an embodiment of a seamless structure of a main plant building of a gas-steam combined cycle power plant.

[0031] In the figure: 1. Combined plant; 2. Waste heat boiler; 3. Post-casting strip; 4. Steam turbine; 5. Gas turbine maintenance site; 6. Gas turbine room; 7. Steam turbine room; 8. Roof ventilator; 9. Gas turbine; 10. 380KV working distribution room; 11. Gas turbine generator outlet room; 12. Excitation transformer room; 13. Current limiting reactor room; 14. SFC room; 15. Steam turbine generator outlet room; 16. Steam turbine maintenance site; 17. Roof truss. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] In addition, when an element in the present invention is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0034] See also Figure 1-Figure 6 ,In the embodiment of the present invention, the seamless structure of the main plant of the gas steam combined cycle power plant is located in the middle part of the combined plant 1;

[0035] The combined plant 1 is symmetrically arranged, and each side is divided into multiple equipment layout areas;

[0036] A post-cast strip 3 is provided in the middle maintenance span of the combined plant 1;

[0037] The equipment layout area is provided with a gas turbine unit and a steam unit, and the outside of the combined plant 1 is supported by a waste heat utilization unit, which is connected to the gas turbine unit. The equipment layout area includes a power distribution area that communicates with the gas turbine unit and the steam unit;

[0038] A ventilation unit is also provided on the top of the combined plant 1 for ventilating the equipment layout area.

[0039] The post-cast zone 3 is arranged at 1 / 3 of the middle maintenance span of the combined factory building 1 .

[0040] It should be supplemented that the advantages of providing the post-casting strip 3 are as follows:

[0041] 1. Adapt to changes in ambient temperature: The post-casting strip 3 can adapt to changes in ambient temperature and prevent cracks caused by temperature stress;

[0042] 2. Adapt to concrete shrinkage and uneven settlement: The post-cast strip 3 can adapt to the shrinkage of concrete and uneven settlement of the structure, thereby reducing the occurrence of cracks;

[0043] 3. Improve the integrity of the structure: By pouring concrete after the internal shrinkage of the component, the structure is connected as a whole to avoid through cracks.

[0044] During specific implementation, the post-cast joint 3 should be located at a position with less stress and deformation, usually every 30-40m, with a width of 700-1000mm. Secondly, the post-cast joint 3 should use shrinkage-compensating concrete, and its compressive strength and impermeability grade should not be lower than the concrete on both sides. The concrete of the post-cast joint 3 should be constructed after the age of the concrete on both sides reaches a certain time, and after the concrete of the post-cast joint 3 is poured, it needs to be cured for no less than 14 days to ensure its quality.

[0045] In addition, during the construction of the post-cast strip 3, the debris in the seam should be cleaned before construction, and protective measures should be taken to prevent the steel bars from rusting or being bent. The steel bars should be kept in accurate positions and continuous. Pads should be set under the single-layer steel bars, and brackets should be set under the double-layer steel bars. Necessary insulation and moisture retention measures should be taken before pouring to avoid surface cracking caused by low temperature.

[0046] The equipment layout area includes a gas turbine room 6 and a steam turbine room 7. The gas turbine unit is arranged in the gas turbine room 6, and the steam unit is arranged in the steam turbine room 7. A gas turbine maintenance site 5 is arranged adjacent to the gas turbine room 6, and a steam turbine maintenance site 16 is arranged adjacent to the steam turbine room 7. No beams are arranged in the middle layer and the operating layer of the gas turbine rooms 6 on both sides.

[0047] The gas turbine unit includes a gas turbine 9 disposed in the gas turbine room 6, and the exhaust end of the gas turbine 9 is connected to the air inlet end of the waste heat utilization unit through a flue and a pipeline, so that high-temperature exhaust gas is introduced into the waste heat utilization unit for heating. The waste heat utilization unit includes a waste heat boiler 2, which is located outside the combined plant 1, and the air inlet end of the waste heat boiler 2 is connected to the exhaust end of the gas turbine 9, and the steam generated in the waste heat boiler 2 forms a cycle with the steam unit.

[0048] Specifically, the high-temperature and high-pressure gas generated by the gas turbine 9 during the fuel combustion process will drive the generator and other equipment to work through the high-speed rotation of the blades, and at the same time transfer heat energy to the exhaust gas. These high-temperature gases are then guided into the waste heat boiler 2, and the heat of the exhaust gas is used to heat the boiler feed water through channels such as flues and pipelines to generate steam.

[0049] It should be noted that the "Technical Code for Design of Civil Structures in Thermal Power Plants" (DL 5022-2012) mentions that when there is sufficient basis, after temperature effect calculation and taking effective measures to meet the design requirements, the temperature expansion joint spacing can be appropriately increased. For the combined building of the distributed energy station with a total length of about 120m, and the steam turbine house 7 with multiple floors is located in the middle of the building, with a length of only about 60m, and the combustion turbine parts on both sides are single-story buildings without floors. Therefore, the temperature stress generated in the whole building is relatively small. Through fine structural calculation and taking reliable construction measures (such as setting the post-cast strip 3, changing the layout of the bottom longitudinal beams, etc.), the goal of canceling the expansion joint can be achieved. By setting the post-cast strip 3 in the middle inspection bay of the combined building 1, the goal of canceling the expansion joint can be achieved;

[0050] Reducing the layout of the bottom longitudinal beams on both sides of the combustion turbine houses 6, without arranging beams on the middle layer and the operating layer of the combustion turbine house 6 on both sides, and only arranging beams on the roof layer can effectively reduce the temperature stress.

[0051] The steam turbine unit includes a steam turbine 4 arranged in the steam turbine house 7. The steam outlet of the waste heat boiler 2 is connected to the steam turbine 4 through a pipeline to form a combined cycle route. An outlet chamber for steam turbine generators 15 is also arranged in the combined building 1.

[0052] Furthermore, the heat exchange is completed in the waste heat boiler 2, which is provided with a heating surface in the form of tubes or tube bundles. The heating surface inside the waste heat boiler 2 converts the exhaust waste heat of the gas turbine 9 into steam, and then these steams enter the water-steam cycle circuit of the steam turbine 4 through pipelines to drive the steam turbine 4 to generate electricity.

[0053] The distribution area includes a 380KV working power distribution room 10, an outlet chamber for gas turbine generators 11, an excitation transformer room 12, a current-limiting reactor room 13, and an SFC room 14. The outlet chamber for gas turbine generators 11, the excitation transformer room 12, the current-limiting reactor room 13, and the SFC room 14 are distributed in a "field" shape. The ventilation unit includes a roof ventilator 8 arranged on the roof truss 17, and a ventilation system is arranged in the combined building 1 to promote the air circulation in the combined building 1.

[0054] As another embodiment of the present invention, a seamless design method for the main building of a gas-steam combined cycle power plant is also proposed. Using the seamless structure, the double columns beside the middle inspection bay of the combined building 1 are cancelled, and a construction post-cast strip 3 is set at 1 / 3 of the middle inspection bay. At the same time, the layout of the bottom longitudinal beams on both sides of the combustion turbine houses 6 is reduced, and no beams are arranged on the middle layer and the operating layer of the combustion turbine houses 6 on both sides, and only beams are arranged on the roof layer.

[0055] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0056] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. The seamless structure of the main building of a gas-steam combined cycle power plant is characterized by: It is located in the middle of the combined workshop (1); Among them, the combined workshop (1) is symmetrically arranged, and each side is divided into multiple equipment layout areas; A post-cast strip (3) is arranged in the middle maintenance bay of the combined workshop (1); A gas turbine unit and a steam turbine unit are arranged in the equipment layout area. A waste heat utilization unit is arranged in a counter-bracing manner outside the combined workshop (1). The waste heat utilization unit is connected to the gas turbine unit. The equipment layout area includes a power distribution area for communicating with the gas turbine unit and the steam turbine unit; A roof truss (17) is arranged on the top of the combined workshop (1), and a ventilation unit is arranged on the roof truss (17) for ventilating the equipment layout area.

2. The seamless structure of the main building of a gas-steam combined cycle power plant according to claim 1, characterized in that: The post-cast strip (3) is arranged at the 1 / 3 position of the middle maintenance bay of the combined workshop (1).

3. The seamless structure of the main building of a gas-steam combined cycle power plant according to claim 1, characterized in that: The equipment layout area includes a gas turbine room (6) and a steam turbine room (7). The gas turbine unit is arranged in the gas turbine room (6), and the steam turbine unit is arranged in the steam turbine room (7). A gas turbine maintenance site (5) is arranged adjacent to the gas turbine room (6), and a steam turbine maintenance site (16) is arranged adjacent to the steam turbine room (7). There are no beams on the middle layer and the operating layer of the two-side gas turbine room (6).

4. The seamless structure of the main building of a gas-steam combined cycle power plant according to claim 3 is characterized in that: The gas turbine unit includes a gas turbine (9) arranged in the gas turbine room (6). The exhaust end of the gas turbine (9) is connected to the intake end of the waste heat utilization unit through a flue and a pipeline, so that high-temperature waste gas is introduced into the waste heat utilization unit for heating.

5. The seamless structure of the main building of a gas-steam combined cycle power plant according to claim 4, characterized in that: The waste heat utilization unit includes a waste heat boiler (2). The waste heat boiler (2) is located outside the combined workshop (1). The intake end of the waste heat boiler (2) is connected to the exhaust end of the gas turbine (9), and the steam generated in the waste heat boiler (2) forms a cycle with the steam turbine unit.

6. The seamless structure of the main building of a gas-steam combined cycle power plant according to claim 5, characterized in that: The steam turbine unit includes a steam turbine (4) arranged in the steam turbine room (7). The steam outlet of the waste heat boiler (2) is connected to the steam turbine (4) through a pipeline to form a combined cycle route. A steam turbine generator outgoing line room (15) is also arranged in the combined workshop (1).

7. The seamless structure of the main building of a gas-steam combined cycle power plant according to claim 1, characterized in that: The power distribution area includes a 380KV working power distribution room (10), a gas turbine generator outgoing line room (11), an excitation transformer room (12), a current-limiting reactor room (13), and an SFC room (14). The gas turbine generator outgoing line room (11), the excitation transformer room (12), the current-limiting reactor room (13), and the SFC room (14) are distributed in a "field" shape.

8. The seamless structure of the main building of a gas-steam combined cycle power plant according to claim 1, characterized in that: The ventilation unit includes a roof ventilator (8) arranged on the roof truss (17), and a ventilation system is arranged in the combined workshop (1) to promote the air circulation in the combined workshop (1).

9. A seamless design method for a main building of a gas-steam combined cycle power plant, using a seamless structure as claimed in any one of claims 1 to 8, characterized in that ； Cancel the double columns beside the middle maintenance bay of the combined workshop (1), set a construction post-cast strip (3) at the 1 / 3 position of the middle maintenance bay. At the same time, reduce the arrangement of the bottom longitudinal beams on both sides of the gas turbine room (6), and do not set beams on the middle layer and the operating layer of the two-side gas turbine room (6), and only set beams on the roof layer.

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