Steam turbine gravity drainage system arranged at low position

Abstract

The utility model discloses a steam turbine gravity drainage system arranged at a low position, and relates to the technical field of steam turbine drainage system transformation. The steam turbine drainage system comprises a condenser, a pipeline drainage flash tank, a body drainage flash tank, a high-pressure main steam supply check valve, a high-emission check valve and the like, wherein the condenser, the pipeline drainage flash tank, the body drainage flash tank, the high-pressure main steam supply check valve and the high-emission check valve are not mentioned in the existing steam turbine drainage system technology. The bottom position of the pipeline drain flash tank and the bottom position of the body drain flash tank are arranged at the height direction position higher than the machine adjusting water level of the condenser, and the pipeline drain flash tank and the body drain flash tank are communicated through the drain pipeline to form a structure similar to a communicating vessel. The two drainage flash tanks cannot cause unsmooth drainage due to the fact that the water level of the condenser is too high and the drainage collecting pipe is filled with water, the purpose of unpowered drainage is achieved, and meanwhile due to the fact that a booster pump does not need to be adopted, the problems that pump type selection is difficult, and cavitation is prone to occurring do not exist.

Description

Technical Field

[0001] This utility model relates to the field of turbine drainage system modification technology, specifically to a low-positioned turbine gravity drainage system. Background Technology

[0002] Currently, in gas-fired combined cycle units employing a low-to-medium elevation layout, the turbine center elevation is consistent with the condenser center elevation. The turbine's condensate drainage system consists of two main parts: turbine body condensate drainage and turbine piping condensate drainage. The condensate from these two parts is collected through condensate manifolds to the turbine body condensate expansion tank and the piping condensate expansion tank, and then, after being cooled by the condensate expansion tank, it is pumped from the expansion tank to the condenser.

[0003] like Figure 1 As shown, since the water level in the condensate expansion tank is lower than the normal water level in the condenser hot well, a condensate pump must be used to drain the condensate in the condensate expansion tank into the condenser hot well. However, because the inlet of the condensate booster pump is a vacuum, it is difficult to select the right pump, which is prone to cavitation. This has led to frequent accidents in the actual operation of the power plant, resulting in the pipeline being unable to drain water normally. Furthermore, because the steam parameters entering the condensate expansion tank are inconsistent, the water level reading in the condensate expansion tank is often inaccurate, misleading the judgment of the operators and affecting the normal start-up and shutdown of the unit. Utility Model Content

[0004] The purpose of this invention is to solve the problem that in the existing technology, the water level in the condensate expansion container is lower than the normal water level in the condenser hot well. In this case, a condensate pump must be used to discharge the condensate in the condensate expansion container into the condenser hot well. However, since the inlet of the condensate booster pump is a vacuum, it is difficult to select the right pump and cavitation is likely to occur. This invention provides a low-positioned turbine gravity condensate drainage system.

[0005] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0006] The low-positioned turbine gravity drainage system includes a condenser, a pipeline drainage expansion container, and a main body drainage expansion container. The pipeline drainage expansion container and the main body drainage expansion container are located beside the condenser. The bottom of the pipeline drainage expansion container and the main body drainage expansion container is higher than the condenser's regulating water level and are connected by drainage pipes.

[0007] Furthermore, both the pipeline drainage expansion container and the main body drainage expansion container are connected and installed with drainage manifolds.

[0008] Furthermore, the bottom of the condenser is mounted on an elevated position at a height of 500mm above the ground.

[0009] Furthermore, the heights of the condenser's regulating water level and normal water level from the ground are 1500mm and 900mm, respectively.

[0010] Furthermore, the height of the drainage pipe above the ground is 2100mm.

[0011] The beneficial effects of this utility model are as follows:

[0012] This invention sets the bottom of the pipeline drainage expansion container and the main body drainage expansion container at a height higher than the condenser's regulating water level, and connects them through a drainage pipe to form a structure similar to a communicating vessel. Since the lowest drainage manifold on the two drainage expansion containers is higher than the condenser, it means that no matter what the condenser is operating under, the two drainage expansion containers will not experience drainage problems due to the condenser's water level being too high or the drainage manifold being full of water. This achieves the purpose of drainage without power. At the same time, since there is no need to use a booster pump, there is no problem of difficulty in selecting a pump or the risk of cavitation. Attached Figure Description

[0013] Figure 1 This is a layout diagram of the steam turbine drainage system in the prior art of this utility model;

[0014] Figure 2 This is a layout diagram of the improved turbine gravity drainage system of this utility model;

[0015] Reference numerals: 1. Condenser; 2. Pipeline drain expansion container; 3. Main body drain expansion container; 4. Drainage pipeline. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0017] This embodiment primarily provides a turbine gravity drainage system to address the problem in existing technologies where the water level in the drainage expansion tank is lower than the normal water level in the condenser hot well. This necessitates the use of a drainage pump to discharge the condensate from the drainage expansion tank into the condenser hot well. However, because the inlet of the drainage booster pump is under vacuum, pump selection is difficult, and cavitation problems are prone to occur. The following technical solution is provided, which will be discussed in conjunction with... Figure 1 and Figure 2 Please provide a detailed explanation: Example

[0018] The low-positioned turbine gravity drainage system includes the condenser 1, pipeline drainage expansion vessel 2, and main body drainage expansion vessel 3 as found in existing turbine drainage system technologies, as well as high-pressure main steam supply check valves and high-pressure exhaust check valves (not mentioned above). The purpose of this application is to achieve non-powered drainage. The main structure involves the pipeline drainage expansion vessel 2 and the main body drainage expansion vessel 3 being located beside the condenser 1, with their bottom positions higher than the regulating water level of the condenser 1. Furthermore, they are connected via a drainage pipe 4 to form a structure similar to a communicating vessel. Both the drainage expansion container 2 and the main drainage expansion container 3 are connected and equipped with drainage manifolds. The bottom of the condenser 1 is suspended 500mm above the ground. The adjustment water level and normal water level of the condenser 1 are 1500mm and 900mm above the ground, respectively. The drainage pipe 4 is 2100mm above the ground, ensuring that the bottom of both drainage expansion containers is higher than the bottom of the condenser 1. Specifically, the bottom of the condenser 1 is only 500mm high. Therefore, the water in the two expansion containers can flow to the condenser 1 by gravity without the need for a booster pump. Furthermore, even if a high water level causes a turbine trip in condenser 1, the trip water level in condenser 1 will be 1500mm, which is 2000mm from the ground. The lowest condensate manifold height on the two condensate expansion tanks is 2400mm. This means that no matter what operating condition condenser 1 is under, the two condensate expansion tanks will not experience poor drainage due to the high water level in condenser 1 or the condensate manifold being full of water. This achieves the purpose of non-powered drainage. At the same time, since there is no need to use a booster pump, there is no problem of difficulty in selecting a pump or the risk of cavitation.

[0019] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A low-positioned turbine gravity drainage system, comprising a condenser (1), a pipeline drainage expansion tank (2), and a main body drainage expansion tank (3), characterized in that, The pipeline drainage expansion container (2) and the main body drainage expansion container (3) are located on the side of the condenser (1). The bottom of the pipeline drainage expansion container (2) and the main body drainage expansion container (3) is higher than the condenser (1) water level and they are connected by a drainage pipe (4).

2. The low-positioned turbine gravity drainage system according to claim 1, characterized in that, Both the pipeline drainage expansion container (2) and the main body drainage expansion container (3) are connected and installed with drainage manifolds.

3. The low-positioned turbine gravity drainage system according to claim 1, characterized in that, The bottom of the condenser (1) is mounted on an overhead platform at a height of 500mm above the ground.

4. The low-positioned turbine gravity drainage system according to claim 1, characterized in that, The condenser (1) has a water level of 1500 mm and a normal water level of 900 mm above the ground.

5. The low-positioned turbine gravity drainage system according to claim 1, characterized in that, The drainage pipe (4) is 2100mm above the ground.

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