A steam turbine exhaust steam cooling device

Abstract

The application discloses a steam turbine exhaust steam cooling device and belongs to the technical field of steam turbines. The device solves the problem of poor air cooling effect of the steam turbine exhaust steam, which leads to high exhaust pressure and affects the production efficiency of the device. The steam turbine exhaust steam cooling device comprises a steam turbine, an exhaust steam pipeline, a cooling mechanism, a surface condenser and a condensate tank. The input end of the exhaust steam pipeline is communicated with the steam turbine, and the output end is communicated with the input end of the surface condenser. The output end of the surface condenser is communicated with the condensate tank. The cooling mechanism is arranged on the exhaust steam pipeline and can cool the exhaust steam passing through the exhaust steam pipeline. In use, the cooling mechanism can cool the exhaust steam flowing through the exhaust steam pipeline, the cooled exhaust steam is cooled again in the surface condenser, and the exhaust steam is cooled into condensate water and then enters the condensate tank. The application can cool the exhaust steam, reduce the exhaust steam pressure, avoid the device running at a reduced load, improve the production efficiency of the device and avoid economic losses caused by the device running at a reduced load.

Description

Technical Field

[0001] This application relates to the field of steam turbine technology, and in particular to a steam turbine exhaust steam cooling device. Background Technology

[0002] A steam turbine is a rotary steam power plant. High-temperature, high-pressure steam passes through a fixed nozzle, becomes an accelerated airflow, and is then injected onto the blades, causing the rotor, which is equipped with rows of blades, to rotate and perform work. Steam turbines are the main equipment in modern thermal power plants and are also used in the metallurgical industry, chemical industry, and ship propulsion systems.

[0003] Currently, due to the poor air cooling effect of the turbine exhaust steam, the exhaust pressure is high. Especially in hot summer weather, the unit needs to operate at a reduced load, which affects the unit's production efficiency. Utility Model Content

[0004] This application provides a turbine exhaust steam cooling device, which solves the problem that the current exhaust steam air cooling effect is not good, resulting in high exhaust pressure and affecting the production efficiency of the device.

[0005] This utility model provides a turbine exhaust steam cooling device, which includes a turbine, an exhaust steam pipeline, a cooling mechanism, a surface condenser, and a condensate tank. The input end of the exhaust steam pipeline is connected to the turbine, and the output end is connected to the input end of the surface condenser. The output end of the surface condenser is connected to the condensate tank. The cooling mechanism is installed on the exhaust steam pipeline and is capable of cooling the exhaust steam passing through the exhaust steam pipeline.

[0006] In one possible implementation, the cooling mechanism includes a cooling pipe and a first valve; the cooling pipe is wound around the outer wall of the exhaust steam pipe, and a low-temperature medium with a temperature lower than that of the exhaust steam is introduced into the cooling pipe; the first valve is installed on the cooling pipe and is close to the output end of the cooling pipe.

[0007] In one possible implementation, the cooling mechanism further includes a second valve; the second valve is installed in the cooling pipe and is located near the inlet end of the cooling pipe.

[0008] In one possible implementation, the inlet of the cooling pipe is connected to the vent line of the liquid nitrogen storage tank.

[0009] In one possible implementation, the turbine exhaust steam cooling device further includes a condensate pump; the input end of the condensate pump is connected to the condensate tank, and the output end is connected to the external pipeline network.

[0010] One or more technical solutions provided in the embodiments of this utility model have at least the following technical effects or advantages:

[0011] This utility model provides a turbine exhaust steam cooling device, which includes a turbine, an exhaust steam pipeline, a cooling mechanism, a surface condenser, and a condensate tank. The inlet of the exhaust steam pipeline is connected to the turbine, and the outlet is connected to the inlet of the surface condenser. The outlet of the surface condenser is connected to the condensate tank. The cooling mechanism is installed on the exhaust steam pipeline and can cool the exhaust steam passing through the pipeline. In actual use, the cooling mechanism can cool the exhaust steam flowing through the exhaust steam pipeline. The cooled exhaust steam enters the surface condenser for further cooling, and the cooled exhaust steam, after being cooled into condensate, enters the condensate tank. This application can cool the exhaust steam, reduce the exhaust steam pressure, and avoid the plant operating at reduced load, thereby improving the plant's production efficiency and avoiding economic losses caused by the plant operating at reduced load. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 This is a schematic diagram of the structure of the turbine exhaust steam cooling device provided in the embodiments of this application.

[0014] Icons: 1-Steam turbine; 2-Exhaust steam pipeline; 3-Cooling mechanism; 31-Cooling pipeline; 32-First valve; 33-Second valve; 4-Surface condenser; 5-Condensate tank; 6-Liquid nitrogen storage tank; 7-Condensate pump; 8-External pipeline network. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0016] In the description of the embodiments of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the embodiments of this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this utility model can be understood according to the specific circumstances.

[0017] like Figure 1 As shown, this embodiment of the present invention provides a turbine exhaust steam cooling device, which includes a turbine 1, an exhaust steam pipeline 2, a cooling mechanism 3, a surface condenser 4, and a condensate tank 5. Specifically, the turbine 1 is driven by high-pressure steam.

[0018] like Figure 1 As shown, the inlet of the exhaust steam pipe 2 is connected to the steam turbine 1, and the outlet is connected to the inlet of the surface condenser 4. The outlet of the surface condenser 4 is connected to the condensate tank 5. Specifically, the surface condenser 4 can cool the exhaust steam flowing out of the exhaust steam pipe 2, and the cooled exhaust steam enters the condensate tank 5 after being condensed.

[0019] In this embodiment, the cooling mechanism 3 is installed on the exhaust steam pipe 2 and is capable of cooling the exhaust steam passing through the exhaust steam pipe 2. Specifically, the cooling mechanism 3 is capable of cooling the exhaust steam passing through the exhaust steam pipe 2.

[0020] This utility model provides a turbine exhaust steam cooling device, which includes a turbine 1, an exhaust steam pipeline 2, a cooling mechanism 3, a surface condenser 4, and a condensate tank 5. The input end of the exhaust steam pipeline 2 is connected to the turbine 1, and the output end is connected to the input end of the surface condenser 4. The output end of the surface condenser 4 is connected to the condensate tank 5. The cooling mechanism 3 is installed on the exhaust steam pipeline 2 and can cool the exhaust steam passing through it. In actual use, the cooling mechanism 3 cools the exhaust steam flowing through the exhaust steam pipeline 2. The cooled exhaust steam enters the surface condenser 4 for further cooling, and after being cooled into condensate, it enters the condensate tank 5. This invention can cool the exhaust steam, reduce its pressure, and avoid the plant operating at reduced load, thereby improving the plant's production efficiency and avoiding economic losses caused by reduced load operation.

[0021] like Figure 1 As shown, the cooling mechanism 3 includes a cooling pipe 31 and a first valve 32. The cooling pipe 31 is wound around the outer wall of the exhaust steam pipe 2, and a low-temperature medium with a temperature lower than that of the exhaust steam flows through the cooling pipe 31. The first valve 32 is installed on the cooling pipe 31 and is located near the output end of the cooling pipe 31. Specifically, when it is necessary to cool the exhaust steam, the first valve 32 is opened, and the low-temperature medium is continuously introduced into the cooling pipe 31 from the inlet pipe. During the flow of the low-temperature medium, heat is exchanged with the exhaust steam pipe 2 to achieve exhaust steam cooling. When it is not necessary to cool the exhaust steam, the first valve 32 is closed. The cooling mechanism 3 of this application has a simple structure and high cooling efficiency.

[0022] In this embodiment, the cooling mechanism 3 further includes a second valve 33. The second valve 33 is installed on the cooling pipe 31 and is located near the inlet end of the cooling pipe 31. Specifically, the second valve 33 is used when the first valve 32 fails, so as to prevent the cooling mechanism 3 from being unable to switch its operating state due to the failure of the first valve 32.

[0023] like Figure 1 As shown, the inlet of cooling pipe 31 is connected to the vent line of liquid nitrogen storage tank 6. Specifically, since the gaseous nitrogen in the top of liquid nitrogen storage tank 6 is directly discharged to the atmosphere through the vent line to maintain a slight positive pressure in liquid nitrogen storage tank 6, a large amount of gaseous nitrogen is wasted. Therefore, by connecting the inlet of cooling pipe 31 to the vent line of liquid nitrogen storage tank 6, the gaseous nitrogen discharged from the vent line can be introduced into cooling pipe 31 to exchange heat with the exhaust steam, thereby cooling the exhaust steam. This not only avoids the waste of gaseous nitrogen through venting but also reduces the cost of exhaust steam cooling.

[0024] In this embodiment of the application, the turbine exhaust steam cooling device further includes a condensate pump 7. The input end of the condensate pump 7 is connected to the condensate tank 5, and the output end is connected to the external transmission pipeline 8. Specifically, the condensate pump 7 can transport the condensate in the condensate tank 5 to the external transmission pipeline 8.

[0025] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.

[0026] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. A steam turbine exhaust steam cooling device, characterized in that, It includes a steam turbine (1), a waste steam pipeline (2), a cooling mechanism (3), a surface condenser (4), and a condensate tank (5); The inlet of the exhaust steam pipe (2) is connected to the steam turbine (1), and the outlet is connected to the inlet of the surface condenser (4). The output end of the surface condenser (4) is connected to the condensate tank (5); The cooling mechanism (3) is installed on the exhaust steam pipe (2) and can cool the exhaust steam passing through the exhaust steam pipe (2).

2. The turbine exhaust steam cooling device according to claim 1, characterized in that, The cooling mechanism (3) includes a cooling pipe (31) and a first valve (32); The cooling pipe (31) is wrapped around the outer wall of the exhaust steam pipe (2), and a low-temperature medium with a temperature lower than that of the exhaust steam is introduced into the cooling pipe (31); The first valve (32) is installed on the cooling pipe (31) and is close to the output end of the cooling pipe (31).

3. The turbine exhaust steam cooling device according to claim 2, characterized in that, The cooling mechanism (3) also includes a second valve (33); The second valve (33) is installed on the cooling pipe (31) and is close to the inlet end of the cooling pipe (31).

4. The turbine exhaust steam cooling device according to claim 2, characterized in that, The inlet of the cooling pipe (31) is connected to the venting line of the liquid nitrogen storage tank (6).

5. The turbine exhaust steam cooling device according to claim 1, characterized in that, It also includes condensate pumps (7); The input end of the condensate pump (7) is connected to the condensate tank (5), and the output end is connected to the external pipeline network (8).

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