A plant layout structure applied to four pipelines of a single-shaft combustion engine

Abstract

The application relates to the field of gas-steam combined cycle generator sets, and discloses a workshop layout structure applied to a single-shaft gas turbine four-pipe, which comprises a base, a lubricating oil tank, a single-shaft gas-steam combined cycle generator set, a main steam pipe, a high-temperature reheat steam pipe, a low-temperature reheat pipe, a low-pressure steam pipe, a high-pressure main steam valve, a low-pressure main steam valve, a reheat main steam valve and a lubricating oil pipe, wherein the embodiment of the application can reduce the arrangement length of the main steam pipe, the high-temperature reheat steam pipe, the low-temperature reheat pipe and the low-pressure steam pipe, reduce the number of elbows, reduce pressure drop, improve system efficiency and save construction cost. In addition, the application fully separates the oil pipe from the main steam pipe, the high-temperature reheat steam pipe, the low-temperature reheat pipe and the low-pressure steam pipe, avoids the contact between the flammable and explosive lubricating oil pipe and other high-temperature pipes, effectively guarantees the safety of the workshop and avoids causing safety hazards.

Description

Technical Field

[0001] This invention relates to the field of gas-fired steam combined cycle generator sets, and in particular to a plant layout structure for the four main pipelines of a single-shaft gas turbine. Background Technology

[0002] Currently, single-shaft gas turbines have the advantages of small footprint and low investment, making them a commonly used unit type in peak-shaving gas turbine power plants. The four main pipelines in a gas turbine power plant are: main steam pipeline, high-temperature reheat pipeline, low-temperature reheat pipeline, and low-pressure steam pipeline. These four pipelines connect directly from the boiler reheater to the turbine cylinder interface for power generation, and are the most important pipelines in a gas turbine power plant. Furthermore, due to the high design temperature and pressure of the main steam pipeline and high-temperature reheat pipeline, expensive piping materials such as ASM A335P91 or ASM A335P92 are required, making the cost per meter of piping very high (approximately 70,000 RMB / ton). Shortening the pipeline length is an important means of reducing initial investment. Because of the limited space in the main plant of a single-shaft gas turbine, high-temperature pipelines (the operating temperature of the main steam and high-temperature reheat steam pipelines in F-class and above gas turbines often exceeds 600℃) are often arranged parallel to or intersecting with flammable and explosive oil pipelines, posing safety hazards. The main steam pipeline and low-pressure steam pipeline are connected to the main steam valve. The main steam valve also needs to be considered for maintenance. An overly dense pipeline layout would make the placement of the maintenance platform extremely difficult. How to arrange the four major pipelines while minimizing their length, maintaining sufficient distance from the oil pipeline, and fully considering the maintenance of the main steam valve has become an important issue. Summary of the Invention

[0003] The technical problem to be solved by this invention is that, due to the narrow space of the main plant of a single-shaft gas turbine, high-temperature pipelines (the operating temperature of the main steam and high-temperature reheat steam pipelines of F-class and above gas turbines is often greater than 600°C) are often arranged in parallel or cross with flammable and explosive oil pipelines, which poses a safety hazard.

[0004] To solve the above-mentioned technical problems, the present invention provides a plant layout structure for the four major pipelines of a single-shaft gas turbine, which includes: a base, a lubricating oil tank, a single-shaft gas-steam combined cycle generator set, a main steam pipeline, a high-temperature reheat steam pipeline, a low-temperature reheat pipeline, a low-pressure steam pipeline, a high-pressure main steam valve, a low-pressure main steam valve, a reheat main steam valve, and a lubricating oil pipeline.

[0005] The reheat main steam valve is located directly in front of the base; the high-pressure main steam valve and the low-pressure main steam valve are located to the left front of the base;

[0006] The single-shaft gas-steam combined cycle generator set includes: a gas turbine, a generator, and a steam turbine; the gas turbine, the generator, and the steam turbine are mounted on the base; the steam turbine is connected to the reheat main gas valve, one end of the high-temperature reheat steam pipe is connected to the reheat main gas valve, and the other end of the high-temperature reheat steam pipe extends to the left side of the base;

[0007] The high-pressure main steam valve and the low-pressure main steam valve are respectively located on the left side of the base. The high-pressure main steam valve and the low-pressure main steam valve are respectively connected to the steam turbine through steam pipes. One end of the main steam pipe is connected to the high-pressure main steam valve, and the other end of the main steam pipe extends to the left side of the base. One end of the low-pressure steam pipe is connected to the low-pressure main steam valve, and the other end of the main steam pipe extends to the left side of the base.

[0008] One end of the lubricating oil pipeline is connected to the gas turbine, generator, and steam turbine, and the other end of the lubricating oil pipeline is connected to the lubricating oil tank. The lubricating oil pipeline is located on the right side of the base.

[0009] Optionally, a first maintenance platform is provided between the low-pressure steam pipeline and the high-pressure main steam valve; the first maintenance platform is located directly above the high-temperature reheat steam pipeline.

[0010] Optionally, the first maintenance platform is hoisted onto the roof.

[0011] Optionally, it may also include: a plurality of staircases; one end of the staircases is connected to the first maintenance platform, and the other end of the staircases abuts the ground.

[0012] Optionally, the gas turbine, the generator, and the steam turbine are arranged sequentially along its central axis X.

[0013] Optionally, the high-temperature reheat steam pipe passes below the high-pressure main steam valve and the low-pressure main steam valve.

[0014] Optionally, the height of the main steam pipe is 13 meters.

[0015] Optionally, the low-pressure steam pipe has a height of 12 meters.

[0016] Optionally, the high-temperature reheat steam pipeline is covered with aerogel insulation material.

[0017] Optionally, the low-pressure main steam valve and the reheat main steam valve are arranged adjacent to each other.

[0018] Compared with existing technologies, the plant layout structure of the four major pipelines of a single-shaft gas turbine according to an embodiment of the present invention has the following advantages:

[0019] (1) Reduce the length of the main steam pipeline, high temperature reheat steam pipeline, low temperature reheat pipeline and low pressure steam pipeline, reduce the number of bends, reduce the pressure drop, improve system efficiency and save construction costs. According to the price of P92 pipeline of about 70,000 yuan per ton, this layout scheme can solve about 10 tons of P92 pipeline and save about 700,000 yuan in construction costs.

[0020] (2) The oil pipeline is fully isolated from the main steam pipeline, high-temperature reheat steam pipeline, low-temperature reheat pipeline and low-pressure steam pipeline, which avoids the flammable and explosive lubricating oil pipeline from coming into contact with other high-temperature pipelines, thus effectively ensuring the safety of the plant and avoiding safety hazards. Attached Figure Description

[0021] Figure 1 This is a top view of an embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram showing the positional relationship between the low-pressure main steam valve and the high-pressure main steam valve in an embodiment of the present invention.

[0023] In the diagram, 1. Main steam pipeline; 2. High-pressure main steam valve; 3. First maintenance platform; 4. Low-pressure steam pipeline; 5. Low-pressure main steam valve; 6. High-temperature reheat steam pipeline; 7. Reheat main steam valve; 8. Lubricating oil pipeline; 9. Base. Detailed Implementation

[0024] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0025] First, it should be noted that the directions such as top, bottom, upward, and downward mentioned in this article are defined relative to the directions in the various accompanying figures. They are relative concepts and therefore can change depending on their different positions and practical applications. Therefore, these or other directions should not be interpreted as restrictive terms.

[0026] It should be noted that the term "comprising" does not exclude other elements or steps, and "a" or "an" does not exclude the plural.

[0027] Furthermore, it should be noted that any single technical feature described or implied in the embodiments herein, or any single technical feature shown or implied in the accompanying drawings, can still be combined among these technical features (or their equivalents) to obtain other embodiments of this application not directly mentioned herein.

[0028] It should also be understood that while the terms "first," "second," etc., are used in this document to describe various types of information, this information should not be limited to these terms, which are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0029] It should be noted that in different figures, the same reference numerals denote the same or substantially the same components.

[0030] like Figure 1 and Figure 2 As shown, a preferred embodiment of the present invention provides a plant layout structure for the four main pipelines of a single-shaft gas turbine, comprising: a base 9, a lubricating oil tank, a single-shaft gas-steam combined cycle generator set, a main steam pipeline 1, a high-temperature reheat steam pipeline 6, a low-temperature reheat pipeline, a low-pressure steam pipeline 4, a high-pressure main steam valve 2, a low-pressure main steam valve 5, a reheat main steam valve 7, and a lubricating oil pipeline 8.

[0031] The reheat main steam valve 7 is located directly in front of the base 9; the high-pressure main steam valve 2 and the low-pressure main steam valve 5 are located to the left front of the base 9.

[0032] The single-shaft gas-steam combined cycle generator set includes a gas turbine, a generator, and a steam turbine. The gas turbine, the generator, and the steam turbine are mounted on the base 9. The reheat main steam valve 7 is located below the base 9. The steam turbine is connected to the reheat main steam valve. One end of the high-temperature reheat steam pipe 6 is connected to the reheat main steam valve, and the other end of the high-temperature reheat steam pipe 6 extends to the left side of the base 9.

[0033] One end of the low-temperature reheat pipe is connected to the base 9, and the other end of the high-temperature reheat steam pipe 6 extends to the left side of the base 9.

[0034] The high-pressure main steam valve 2 and the low-pressure main steam valve 5 are respectively located on the left side of the base 9. The high-pressure main steam valve 2 and the low-pressure main steam valve 5 are respectively connected to the steam turbine through steam pipes. One end of the main steam pipe 1 is connected to the high-pressure main steam valve 2, and the other end of the main steam pipe 1 extends to the left side of the base 9. One end of the low-pressure steam pipe 4 is connected to the low-pressure main steam valve 5, and the other end of the main steam pipe 1 extends to the left side of the base 9.

[0035] One end of the lubricating oil pipe 8 is connected to the gas turbine, generator, and steam turbine, and the other end of the lubricating oil pipe 8 is connected to the lubricating oil tank. The lubricating oil pipe 8 is located on the right side of the base 9.

[0036] Based on the above structure, this application arranges the main steam pipeline 1, high-temperature reheat steam pipeline 6, low-temperature reheat pipeline, and low-pressure steam pipeline 4 on the left side of the base 9 (the side closest to the boiler interface), while all lubricating oil pipelines 8 are arranged on the right side of the base 9. This shortens the total length of the main steam pipeline 1, high-temperature reheat steam pipeline 6, low-temperature reheat pipeline, and low-pressure steam pipeline 4, while ensuring that the oil pipeline is fully isolated from the main steam pipeline 1, high-temperature reheat steam pipeline 6, low-temperature reheat pipeline, and low-pressure steam pipeline 4. This prevents the flammable and explosive lubricating oil pipeline 8 from contacting or being adjacent to other high-temperature pipelines. Even if the main steam pipeline 1, high-temperature reheat steam pipeline 6, low-temperature reheat pipeline, or low-pressure steam pipeline 4 are damaged, or if the lubricating oil pipeline 8 is damaged, they will not affect each other, effectively ensuring the safety of the plant and avoiding safety hazards.

[0037] Compared to existing layouts, the above structure reduces the length of the main steam pipeline 1, high-temperature reheat steam pipeline 6, low-temperature reheat pipeline, and low-pressure steam pipeline 4, reduces the number of bends, minimizes pressure drop, improves system efficiency, and saves construction costs. Based on the price of P92 pipelines at approximately 70,000 yuan per ton, this layout can solve the problem of approximately 10 tons of P92 pipelines, saving approximately 700,000 yuan in construction costs.

[0038] Furthermore, a first maintenance platform 3 is provided between the low-pressure steam pipeline and the high-pressure main steam valve 2. The first maintenance platform 3 is located directly above the high-temperature reheat steam pipeline 6, and the first maintenance platform 3 can accommodate the maintenance of both the high-pressure main steam valve 2 and the low-pressure main steam valve 5.

[0039] To achieve the goal of extending the main steam pipe 1, high-temperature reheat steam pipe 6, low-temperature reheat pipe, and low-pressure steam pipe 4 from the left side of the base 9 to the boiler plant interface, the pipes are very congested at the exit point of the base 9. Therefore, the reheat steam pipes are staggered by passing under the high-pressure main steam valve 2 and the low-pressure main steam valve 5. Furthermore, at the location where the reheat steam pipes pass through the main steam valves, aerosol insulation material is used, with the insulation thickness locally reduced to avoid collisions. This arrangement method allows for a sufficient distance between the four pipes and the lubricating oil pipe 8 while minimizing their overall length.

[0040] Furthermore, the first maintenance platform 3 is hoisted on the roof. Since the first maintenance platform 3 is located above the reheat steam pipe, it is impossible to erect a ground column below the first maintenance platform 3. Therefore, hoisting the first maintenance platform 3 on the roof can achieve avoidance of the reheat steam pipe.

[0041] In this application, the factory layout structure is located on the same floor, and the roof is the top surface of the floor.

[0042] Furthermore, this embodiment of the invention also includes: a plurality of staircases. One end of the staircase is connected to the first maintenance platform 3, and the other end of the staircase abuts the ground, allowing workers to ascend and descend the first maintenance platform 3 via the staircases.

[0043] Furthermore, the gas turbine, the generator, and the steam turbine are arranged sequentially along its central axis X, with the left side of the base 9 being the left side of the central axis X, and the right side of the base 9 surrounding the right side of the central axis X.

[0044] The high-temperature reheat steam pipeline 6 passes under the high-pressure main steam valve 2 and the low-pressure main steam valve 5, so as to effectively avoid the high-pressure main steam valve 2 and the low-pressure main steam valve 5.

[0045] Furthermore, the height of the main steam pipe 1 is 13 meters.

[0046] Furthermore, the low-pressure steam pipe 4 has a height of 12 meters.

[0047] Furthermore, the high-temperature reheat steam pipe 6 is covered with aerogel insulation material.

[0048] Furthermore, the low-pressure main steam valve 5 and the reheat main steam valve 7 are arranged adjacent to each other.

[0049] In summary, the embodiments of the present invention provide a plant layout structure for the four major pipelines of a single-shaft gas turbine, which has the following advantages:

[0050] (1) Reduce the length of the main steam pipeline 1, high temperature reheat steam pipeline 6, low temperature reheat pipeline and low pressure steam pipeline 4, reduce the number of bends, reduce the pressure drop, improve system efficiency and save construction costs. According to the price of P92 pipeline of about 70,000 yuan per ton, this layout scheme can solve about 10 tons of P92 pipeline and save about 700,000 yuan in construction costs.

[0051] (2) The oil pipeline is fully isolated from the main steam pipeline 1, the high-temperature reheat steam pipeline 6, the low-temperature reheat pipeline and the low-pressure steam pipeline 4, which prevents the flammable and explosive lubricating oil pipeline 8 from coming into contact with other high-temperature pipelines, thus effectively ensuring the safety of the plant and avoiding potential safety hazards.

[0052] (3) The maintenance problems of low-pressure main steam valve 5 and reheat main steam valve 7 have been solved. The combined maintenance platform is more aesthetically pleasing and practical, and the footprint is reduced.

[0053] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A plant layout structure for the four main pipelines of a single-shaft gas turbine, characterized in that, include: Base, lubricating oil tank, single-shaft gas-steam combined cycle generator set, main steam pipeline, high-temperature reheat steam pipeline, low-temperature reheat pipeline, low-pressure steam pipeline, high-pressure main steam valve, low-pressure main steam valve, reheat main steam valve, lubricating oil pipeline; The reheat main steam valve is located directly in front of the base; The high-pressure main steam valve and the low-pressure main steam valve are located at the left front of the base; The single-shaft gas-steam combined cycle generator set includes: a gas turbine, a generator, and a steam turbine; the gas turbine, the generator, and the steam turbine are mounted on the base; the steam turbine is connected to the reheat main steam valve, one end of the high-temperature reheat steam pipeline is connected to the reheat main steam valve, and the other end of the high-temperature reheat steam pipeline extends to the left side of the base; The high-pressure main steam valve and the low-pressure main steam valve are respectively located on the left side of the base. The high-pressure main steam valve and the low-pressure main steam valve are respectively connected to the steam turbine through steam guide pipes. One end of the main steam pipe is connected to the high-pressure main steam valve, and the other end of the main steam pipe extends to the left side of the base. One end of the low-pressure steam pipe is connected to the low-pressure main steam valve, and the other end of the main steam pipe extends to the left side of the base. One end of the lubricating oil pipeline is connected to the gas turbine, generator, and steam turbine, and the other end of the lubricating oil pipeline is connected to the lubricating oil tank. The lubricating oil pipeline is located on the right side of the base. A first maintenance platform is provided between the low-pressure steam pipeline and the high-pressure main steam valve; the first maintenance platform is located directly above the high-temperature reheat steam pipeline; the high-temperature reheat steam pipeline passes under the high-pressure main steam valve and the low-pressure main steam valve.

2. The plant layout structure for the four main pipelines of a single-shaft gas turbine as described in claim 1, characterized in that, The first maintenance platform is hoisted onto the roof.

3. The plant layout structure applied to the four major pipelines of a single-shaft gas turbine according to claim 2, characterized in that, Also includes: Several staircases; one end of the staircase is connected to the first maintenance platform, and the other end of the staircase abuts the ground.

4. The plant layout structure for the four main pipelines of a single-shaft gas turbine as described in claim 1, characterized in that, The gas turbine, the generator, and the steam turbine are arranged sequentially along its central axis X.

5. The plant layout structure applied to the four major pipelines of a single-shaft gas turbine according to claim 1, characterized in that, The height of the main steam pipe is 13 meters.

6. The plant layout structure for the four main pipelines of a single-shaft gas turbine as described in claim 1, characterized in that, The low-pressure steam pipeline is 12 meters high.

7. The plant layout structure applied to the four major pipelines of a single-shaft gas turbine according to claim 1, characterized in that, The high-temperature reheat steam pipeline is covered with aerogel insulation material.

8. The plant layout structure for the four main pipelines of a single-shaft gas turbine as described in claim 1, characterized in that, The low-pressure main steam valve and the reheat main steam valve are arranged adjacent to each other.

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