A steam turbine generator base including a steel structure platform

Abstract

This utility model relates to the technical field of steam turbine generator bases, specifically a steam turbine generator base including a steel structure platform. It includes a steel base plate, support columns, a platform, and the steel structure platform. The steel base plate is a reinforced concrete structure, and the steel base plate and the steel structure platform are connected by multiple support columns. The platform is located between adjacent support columns. The steel structure platform is a steel structure, including parallel upper and lower partitions, and several inner partitions located between the upper and lower partitions. The steel structure platform has pre-drilled holes for equipment pipes to pass through. The support columns are either reinforced concrete or steel structures, and the platform is either reinforced concrete or steel. This utility model replaces traditional concrete bases. Steel components are prefabricated in the factory and assembled on-site, shortening the construction period; eliminating the problem of misalignment of embedded parts, improving installation accuracy; and solving the technical pain points of long construction cycles and difficult modifications associated with concrete bases.

Description

Technical Field

[0001] This utility model relates to the technical field of steam turbine generator bases, specifically a steam turbine generator base including a steel structure platform. Background Technology

[0002] Steam turbine generators are core equipment in power plants, and their foundations, serving as the equipment base, must ensure stable operation. Currently, steam turbine generator foundations typically employ a reinforced concrete slab structure. Figure 1 As shown, the existing steam turbine generator base is a concrete base 1, which includes a concrete base plate 11, concrete columns 12, a concrete platform 13, and a concrete slab 14. The concrete slab 14 is supported on the concrete base plate 11 by the concrete columns 12. The concrete base 1 has the following disadvantages as a steam turbine generator base:

[0003] (1) During the construction of the concrete base 1, scaffolding needs to be erected, steel bars tied, and concrete poured. After the concrete is poured, it needs to be cured for 28 days. The construction period of the concrete base 1 is long, requiring at least 3 to 4 months, which cannot meet the efficiency requirements for projects with short construction periods.

[0004] (2) During the fabrication of the concrete platform 14, it is necessary to embed the anchor bolts and other embedded parts of the equipment. However, the steel bars in the concrete platform 14 are extremely dense, and the embedded parts and anchor bolts are easily not firmly fixed. During the concrete pouring process, it is very easy for the embedded parts and anchor bolts to be misaligned. After the embedded parts and anchor bolts are misaligned, the generator cannot be installed in the preset position in the later stage, resulting in a large construction error and causing difficulties for the subsequent equipment installation.

[0005] (3) Currently, power generation technology is iterating rapidly, requiring updates to steam turbines and generators. To adapt to the new steam turbines and generators, the concrete platform 14 needs to be modified. This modification requires adding anchor bolt holes to the concrete platform 14. However, the concrete platform 14 has dense reinforcement, making it difficult to add anchor bolt holes. Furthermore, the modified base's dynamic performance may not meet the requirements of the new equipment, leading to its inability to adapt to the steam turbine and generator. In other words, new equipment typically needs to adapt to the original platform openings and anchor bolt positions, resulting in poor modifiability.

[0006] Therefore, given the rapid iteration of power generation technology and the need to update steam turbines and generators, traditional concrete foundations are no longer suitable for technological upgrades. How to improve the steam turbine generator foundation is a technical problem that needs to be solved. Utility Model Content

[0007] The problem to be solved is to provide a new steam turbine generator base to adapt to the operating conditions where the power generation technology is iterating rapidly and the steam turbine and generator equipment need to be updated.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a steam turbine generator base including a steel structure platform, comprising a steel base plate, support columns, a platform, and a steel structure platform; the steel base plate is a reinforced concrete structure, and the steel base plate and the steel structure platform are connected by multiple support columns, with the platform located between adjacent support columns; the steel structure platform is a steel structure, including an upper partition and a lower partition arranged in parallel, and several inner partitions located between the upper and lower partitions; the steel structure platform has reserved holes for equipment pipes to pass through; the thickness of the upper partition, lower partition, and inner partitions is all in the range of 16mm to 100mm; the distance between the upper and lower partitions is 500mm to 5000mm; the distance between adjacent inner partitions is 300mm to 5000mm.

[0009] Preferably, the supporting columns are reinforced concrete structures or steel structures.

[0010] Preferably, the platform is a reinforced concrete structure or a steel structure.

[0011] Preferably, when the support column is a reinforced concrete structure, the support column is equipped with a vibration isolator at the top of the support column, and the steel structure platform is set on the vibration isolator.

[0012] Preferably, when the support column is a steel structure, the support column and the steel structure platform are welded together; or a vibration isolator is installed on the top of the support column, and the steel structure platform is installed on the vibration isolator.

[0013] Preferably, the spacing between adjacent support columns is 3m to 15m.

[0014] Compared with the prior art, this utility model provides a steam turbine generator base with a steel structure platform 24, which has the following advantages: In terms of construction cycle, a concrete base needs 28 days of curing after pouring, and the total construction period for factory prefabrication is 3-4 months, while the steel structure base can be assembled on site, thus shortening the construction period; it is also more convenient to use.

[0015] In terms of installation accuracy, the embedded parts of the concrete base are prone to misalignment, and the large error is not conducive to the installation of the steam turbine generator. In contrast, the steel structure platform of the steel structure base has no embedded parts, and welding / bolts can accurately position the steam turbine generator with smaller errors.

[0016] From the perspective of equipment modification adaptability, it is difficult to re-drill holes in concrete foundations, making it difficult to meet the requirements of new equipment for easy cutting / welding of steel structures. In contrast, the steel structure platform of the steel structure foundation supports rapid modification, requiring only drilling at the corresponding location.

[0017] In terms of performance, concrete bases have a fixed frequency and are prone to resonance; while steel structure bases can avoid the unit's operating frequency by adjusting the spacing / thickness of the inner partitions, thus improving vibration damping efficiency.

[0018] From an environmental and economic perspective, the demolition of concrete foundations generates construction waste with a low recycling rate; while steel structure foundations have a high steel recycling rate, avoiding resource waste. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a concrete base structure in the background art;

[0020] Figure 2 This is a schematic diagram of the steel base structure of this utility model;

[0021] Figure 3 for Figure 2 Top view in the middle;

[0022] Figure 4 The above describes the vertical amplitude-frequency curve of the steel base structure of this utility model under GB working conditions.

[0023] Figure 5 The following is a GB standard lateral amplitude-frequency curve of the steel base structure of this utility model.

[0024] Figure 6 The above describes the longitudinal amplitude-frequency curve of the steel base structure of this utility model under GB working conditions.

[0025] Figure 7 The ISO vertical amplitude-frequency curve of the steel base structure of this utility model under working conditions;

[0026] Figure 8 The ISO lateral amplitude-frequency curve of the steel base structure of this utility model under working conditions;

[0027] Explanation of reference numerals in the attached drawings: 1. Concrete base; 11. Concrete base plate; 12. Concrete column; 13. Concrete platform; 14. Concrete slab; 2. Steel structure base; 21. Steel base plate; 22. Support column; 23. Platform; 24. Steel structure slab; 25. Upper partition; 26. Inner partition; 27. Lower partition; 28. Reserved hole. Detailed Implementation

[0028] The technical solutions of the present utility model will now be described with reference to the accompanying drawings in the embodiments of the present utility model:

[0029] To address the problems in the background art, this utility model provides a structural solution for a steam turbine generator base. While ensuring stable equipment operation and structural safety, it can reduce construction time, minimize construction errors, improve installation accuracy, and enhance the adaptability of the base to generator equipment modifications. Figure 2 , Figure 3The turbine generator base shown includes a steel structure platform 24 and a steel base plate 21. The steel base plate 21 is a reinforced concrete structure and is buried underground as the foundation of the base. The steel base plate 21 and the steel structure platform 24 are connected by multiple support columns 22, which are either reinforced concrete or steel structures. The platform 23 is located between adjacent support columns 22, below the steel structure platform 24 and above the steel base plate 21. The platform 23 is also either reinforced concrete or steel. The steel structure platform 24 comprises an upper partition 25, an inner partition 26, and a lower partition 27. The upper partition 25 and the lower partition 27 are arranged parallel to each other, and several inner partitions 26 are provided between the upper partition 25 and the lower partition 27. The number and spacing of the inner partitions 26 are adjustable to achieve precise matching of stiffness and frequency. The steel structure platform 24 has reserved holes 28 for the passage of steam turbine generator equipment pipes. When the support column 22 is a reinforced concrete structure, the support column 22 is connected to the steel structure platform 24 through embedded parts. The thickness of the upper partition 25, the lower partition 27, and the inner partition 26 are all in the range of 16mm to 100mm. The spacing between the upper partition 25 and the lower partition 27 is h, ranging from 500mm to 5000mm. The spacing between adjacent inner partitions 26 is a, ranging from 300mm to 5000mm. The spacing between adjacent support columns 22 is b, ranging from 3m to 15m.

[0030] like Figure 2 In the embodiment shown, the present invention replaces the concrete base 1 in the traditional solution with a steel structure base 2. The steel structure base 2 is provided with a steel structure platform 24, which is a steel structure box formed by welding and splicing steel plates. Figure 2 , Figure 3As shown. The rigidity of the steel structure platform 24 is increased by adding several inner partitions 26 between the upper partition 25 and the lower partition 27, enabling it to bear loads. The rigidity and dynamic performance of the steel structure platform 24 are altered by adjusting the spacing between the upper partition 25 and the lower partition 27, the spacing between adjacent inner partitions 26, and the thickness of the upper partition 25, inner partitions 26, and lower partition 27, thus meeting the requirements for normal equipment operation. The steam turbine generator equipment can be directly welded to the steel structure platform 24, or it can be connected to the steel structure platform 24 using fasteners. All steel structures can be prefabricated in the factory to ensure construction accuracy. Holes can be drilled in the steel structure platform 24 to allow pipes to pass through. Vibration isolators can be used to connect the steel structure platform 24 to the support columns 22, or the steel structure platform 24 can be directly connected to the support columns 22. The support columns 22 can be made of steel or reinforced concrete, and the platform 23 can also be made of steel or reinforced concrete. If both the support column 22 and platform 23 are reinforced concrete structures, connectors are pre-embedded during the pouring of the support column 22 and platform 23, and the platform 23 is connected to the reinforced concrete support column 22 through the pre-embedded connectors. If the support column 22 and platform 23 have different structures, the one using the reinforced concrete structure is pre-embedded with connectors to connect to the other using the steel structure. When the support column 22 is a reinforced concrete structure, a vibration isolator is installed at the top of the support column 22, and the steel structure platform 24 is installed on the vibration isolator. The vibration isolator is generally a steel spring vibration isolator. If the support column 22 is a steel structure, the steel structure platform 24 is connected to the steel support column 22 by welding or bolting, or a vibration isolator is installed at the top of the support column 22, and the steel structure platform 24 is installed on the vibration isolator.

[0031] Taking the example of steel structures for both support column 22 and platform 23, the performance of the steel structure base 2 of this utility model is explained. The feasibility of this utility model is illustrated using dynamic performance analysis data of a steel structure base from a certain engineering project. Referring to a 125MW steam turbine generator main unit model, the equipment layout includes a high-pressure cylinder, a low-pressure cylinder, a generator, and an exciter. Based on the data regarding the rotor and bearing load application positions, it is determined that the high-pressure cylinder, low-pressure cylinder, and generator all use floor-mounted bearings, forming a single-shaft, single-support shaft system.

[0032] The standards for forced vibration analysis are as follows:

[0033] 1. Dynamic parameters and measurement standards are shown in Table 1.

[0034] Table 1: Dynamic parameters and measurement criteria for disturbance response analysis

[0035]

[0036] Table 1 is explained as follows:

[0037] Operating condition GB: Analysis was conducted according to the "Code for Design of Power Machinery Foundations" (GB50040-96). Operating condition ISO: Analysis was conducted according to ISO10816-2-2010 'Mechanical vibration - Evaluation of machine vibration by measurements on non-rotating parts - Part 2: Large land-based steam turbine generator sets in excess of 50MW'.

[0038] Disturbance value: based on the balance mass G6.3, i.e., 0.2 times the rotor weight. The longitudinal disturbance value under operating condition GB is based on 0.1 times the rotor weight.

[0039] Disturbance variation: The disturbance varies with the excitation frequency (fi / fm)2, where fi and fm are the excitation frequency and the unit operating frequency 50 (HZ), respectively.

[0040] The horizontal position of the disturbance force value point is determined by the centerline of the turbine generator and the centerline of the bearing.

[0041] Combination method: The response amplitudes of each disturbance point are combined according to SRSS.

[0042] 2. Response amplitude

[0043] Harmonic response analysis was used to perform disturbance response analysis, and the results are shown in Tables 2, 3, 4, 5, and 6 below: Table 2: Vertical amplitude of GB under working condition

[0044]

[0045]

[0046] Table 3: Horizontal Amplitude of GB under Operating Conditions

[0047] Bearing number Brg_1 Brg_2 Brg_3 Brg_4 Brg_5 Brg_6 Max(μm) Maximum value 6.42 3.88 5.27 4.16 4.48 4.52 6.42 0.0_37.5(hz) 25.06 2.64 24.64 2.64 2.65 2.65 BRG_1 Maximum value 2.81 2.12 1.84 2.24 2.28 1.92 2.81 37.5_45(hz) 44.90 44.90 44.90 44.90 44.90 44.90 BRG_1 Maximum value 4.03 5.91 4.96 5.70 4.72 4.22 5.91 45_55(hz) 54.85 54.85 54.18 54.60 54.85 54.82 BRG_2 Maximum value 7.48 10.98 4.84 5.67 4.71 4.21 10.98 55_62.5(hz) 61.51 61.71 55.04 55.04 55.04 55.04 BRG_2 Maximum value 7.27 10.75 3.48 3.28 2.87 2.33 10.75 62.5_65(hz) 62.54 62.54 62.54 62.54 62.54 62.54 BRG_2

[0048] Table 4: Longitudinal Amplitude of GB under Operating Conditions

[0049]

[0050] Table 5: Vertical Amplitude of ISO under Operating Conditions

[0051] Bearing number Brg_1 Brg_2 Brg_3 Brg_4 Brg_5 Brg_6 Max (mm / s) Maximum value 2.30 2.78 2.89 0.76 1.44 1.69 2.89 45_55(hz) 45.31 49.69 54.95 48.33 45.31 45.31 BRG_3

[0052] Table 6: Horizontal Amplitude of ISO under Operating Conditions

[0053] Bearing number Brg_1 Brg_2 Brg_3 Brg_4 Brg_5 Brg_6 Max (mm / s) Maximum value 1.48 2.94 2.15 2.34 1.64 1.38 2.94 45_55(hz) 47.01 54.44 54.30 54.44 54.95 47.24 BRG_2

[0054] Note: In the frequency range of 45 to 55 Hz, the maximum longitudinal amplitude of the thrust bearing Brg_2 under vertical disturbance is 1.07 mm / s.

[0055] The above two working condition analysis results show that the response amplitudes of the steel structure base disturbance point in all three directions are less than the limit values, which meets the requirements of the relevant specifications and standards. Figures 4 to 8 This demonstrates that the dynamic performance of the steel structure base of this utility model can meet the usage requirements of the equipment.

[0056] The steel components of this utility model's steel structure base 2 can be prefabricated in the factory, requiring only on-site assembly, which can significantly shorten the construction period. The equipment can be commissioned immediately after the steel structure is installed, making it suitable for projects with tight deadlines. Concrete foundations, on the other hand, require a 28-day curing period. The steel structure is manufactured with high precision in the factory, eliminating the need for pre-embedded structural parts and avoiding the problem of misalignment of pre-embedded parts during construction, which could hinder equipment installation. The steel structure is cut and welded, making it easy to create openings and providing strong expansion capabilities. It is also more adaptable to equipment upgrades and modifications. The steel structure can be adjusted to avoid the unit's operating frequency, preventing resonance. Furthermore, the steel structure has a recyclability rate of over 95%, allowing for the recycling of steel after dismantling, reducing construction waste, lowering carbon emissions, and resulting in low total life-cycle investment costs.

[0057] The above embodiments are merely some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A steam turbine generator base comprising a steel structure platform, characterized in that: It includes a steel base plate (21), supporting columns (22), a platform (23), and a steel structure platform (24); the steel base plate (21) is a reinforced concrete structure, and the steel base plate (21) and the steel structure platform (24) are connected by multiple supporting columns (22), and the platform (23) is located between adjacent supporting columns (22); the steel structure platform (24) is a steel structure, including a parallel upper partition (25) and a lower partition (27), and a structure located on the upper partition. (25) Several inner partitions (26) between the upper partition (25) and the lower partition (27); the steel structure platform (24) is provided with reserved holes (28) for equipment pipes to pass through; the thickness of the upper partition (25), the lower partition (27) and the inner partition (26) are all in the range of 16mm to 100mm; the distance between the upper partition (25) and the lower partition (27) is 500mm to 5000mm; the distance between adjacent inner partitions (26) is 300mm to 5000mm.

2. The turbine generator base including a steel structure platform according to claim 1, characterized in that: The supporting column (22) is a reinforced concrete structure or a steel structure.

3. The turbine generator base including a steel structure platform according to claim 2, characterized in that: The platform (23) is a reinforced concrete structure or a steel structure.

4. The turbine generator base including a steel structure platform according to claim 2, characterized in that: When the support column (22) is a reinforced concrete structure, the support column (22) is equipped with a vibration isolator at the top of the support column (22), and the steel structure platform (24) is set on the vibration isolator.

5. The turbine generator base including a steel structure platform according to claim 2, characterized in that: When the support column (22) is a steel structure, the support column (22) and the steel structure platform (24) are welded together; or a vibration isolator is installed on the top of the support column (22), and the steel structure platform (24) is installed on the vibration isolator.

6. The turbine generator base including a steel structure platform according to claim 1, characterized in that: The spacing between adjacent support columns (22) is 3m to 15m.

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