Turbine sealing air-lift temperature system

Abstract

The utility model relates to the technical field of steam turbines, in particular to a steam turbine sealing air lift temperature system which comprises a steam turbine air supply pipe, a high-temperature air supply pipe, a sealing air lift temperature pipe and a temperature control adjusting mechanism. The gas conveying end of the high-temperature gas supply pipe and the gas conveying end of the steam turbine gas supply pipe are both communicated with the gas inlet end of the sealed gas lifting temperature pipe, and the temperature control adjusting mechanism is arranged on the high-temperature gas supply pipe. The high-temperature air supply pipe is additionally arranged, the temperature of steam in the steam turbine air supply pipe is increased through the high temperature of the high-temperature air supply pipe, and therefore the situation that the temperature of sealing steam input into a steam turbine is too low, and consequently the steam turbine is filled with condensate water and damaged is avoided; meanwhile, in order to prevent high-pressure steam provided by the high-temperature steam supply pipe from increasing the temperature of steam of the steam turbine steam supply pipe too high, a temperature control adjusting mechanism is selectively arranged to adjust the steam supply flow of the high-temperature steam supply pipe, and therefore it is guaranteed that sealing gas input into the steam turbine meets the use requirement.

Description

Technical Field

[0001] The utility model relates to the technical field of steam turbines, in particular to a steam turbine sealing gas temperature raising system. Background Art

[0002] A steam turbine is a rotating machine that uses steam as a working fluid and converts the thermal energy of steam into mechanical energy. In order to avoid collision between the moving and static parts of the steam turbine, appropriate gaps must be left. These gaps will cause air leakage and reduce efficiency. Therefore, steam turbines are sealed using steam seals.

[0003] For example, the Chinese utility model patent with application number 202221096392.2 discloses a steam turbine oil retaining ring sealing device, which sends steam into the oil retaining ring body of the steam turbine through an air inlet pipe for sealing.

[0004] Steam turbine sealing gas is usually provided by excess steam generated during factory production. Therefore, the steam source is far away from the steam turbine. At this time, the pipeline that provides steam to the steam turbine has a long transmission distance and huge heat dissipation, which makes the temperature of the steam entering the steam turbine low and easily produces condensed water, which will damage the steam turbine and reduce its service life.

[0005] Especially in winter when the temperature is relatively low, the gas supply pipeline needs additional insulation measures, which increases the cost. At the same time, the steam temperature input to the turbine is still relatively low and cannot meet actual usage needs. Utility Model Content

[0006] The utility model aims to provide a steam turbine sealing gas temperature raising system to solve the technical problem that the temperature of the steam turbine sealing gas cannot meet the use requirements due to the long conveying distance of the steam turbine sealing gas.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A steam turbine sealing gas temperature raising system, comprising a steam turbine air supply pipe, a high-temperature air supply pipe, a sealing gas temperature raising pipe and a temperature control and regulating mechanism;

[0009] The gas delivery end of the high-temperature gas supply pipe and the gas delivery end of the turbine gas supply pipe are both connected to the air inlet end of the sealing gas temperature raising pipe, and the temperature control and adjustment mechanism is arranged on the high-temperature gas supply pipe.

[0010] It is further defined that the temperature control mechanism includes a pneumatic control valve and a temperature transmitter, the pneumatic control valve is communicatively connected to the temperature transmitter, the pneumatic control valve is arranged on the high-temperature air supply pipe, and the temperature transmitter is arranged on the sealed air temperature raising pipe.

[0011] It is further defined that the sealing gas temperature raising pipe is connected to a sealing gas vent pipe, a safety valve is provided on the sealing gas vent pipe, and the sealing gas vent pipe is located between the temperature transmitter and the input end of the sealing gas temperature raising pipe.

[0012] It is further defined that a front stop valve and a rear stop valve are provided on the sealed air temperature lifting pipe, and the pneumatic regulating valve is located between the front stop valve and the rear stop valve.

[0013] It is further defined that the number of the front stop valves is two, and the two front stop valves are arranged front and rear.

[0014] It is further defined that a first shower pipe and a second shower pipe are also provided on the high-temperature air supply pipe, the first shower pipe is provided between the front stop valve and the pneumatic regulating valve, and the second shower pipe is provided between the pneumatic regulating valve and the rear stop valve.

[0015] It is further defined that a first plugging valve and a second plugging blind plate are provided between the turbine air supply pipe and the sealing gas temperature raising pipe, the first plugging valve is connected to the turbine air supply pipe, and the second plugging blind plate is connected to the sealing gas temperature raising pipe.

[0016] It is further defined that the diameter of the turbine air supply pipe and the diameter of the sealing gas temperature raising pipe are both 80 mm, the diameter of the high-temperature air supply pipe is 25 mm, and the diameter of the sealing gas venting pipe is 40 mm.

[0017] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0018] 1. The utility model adds a high-temperature air supply pipe and utilizes the high temperature of the high-temperature air supply pipe to raise the temperature of the steam in the air supply pipe of the turbine, thereby preventing the sealing steam input to the turbine from being too low in temperature and causing the turbine to be filled with condensed water and cause damage; at the same time, in order to prevent the high-pressure steam provided by the high-temperature air supply pipe from raising the temperature of the steam in the air supply pipe of the turbine too high, a temperature control adjustment mechanism is selected to adjust the air supply flow of the high-temperature air supply pipe, thereby ensuring that the sealing gas input to the turbine meets the use requirements.

[0019] 2. The utility model sets a temperature transmitter on the sealing gas temperature raising pipe and a pneumatic regulating valve on the high-temperature gas supply pipe, thereby using the temperature transmitter to adjust the flow of the high-temperature gas supply pipe in real time according to the output steam temperature of the sealing gas temperature raising pipe, thereby making the temperature of the turbine sealing gas more accurate and reliable.

[0020] 3. The utility model provides a sealing gas vent pipe and a safety valve on the vent pipe to avoid excessive pressure in the sealing gas temperature raising pipe to damage the pipeline and the turbine sealing mechanism, thereby ensuring stable and reliable operation of the turbine and meeting actual use requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the steam turbine seal gas temperature raising system of the utility model;

[0022] In the figure: 1-turbine air supply pipe; 2-high-temperature air supply pipe; 3-sealing air temperature raising pipe; 4-sealing air venting pipe; 5-safety valve; 6-front stop valve; 7-rear stop valve; 8-first plugging valve; 9-second plugging blind plate; a-pneumatic regulating valve; b-temperature transmitter; c-first shower pipe; d-second shower pipe. DETAILED DESCRIPTION

[0023] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, not all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present utility model.

[0024] Example 1

[0025] refer to Figure 1 The present embodiment provides a steam turbine sealing gas heating system, comprising a steam turbine air supply pipe 1, a high-temperature air supply pipe 2, a sealing gas heating pipe 3 and a temperature control and adjustment mechanism, wherein the steam turbine air supply pipe 1 and the high-temperature air supply pipe 2 are simultaneously connected to the sealing gas heating pipe 3, and the temperature control and adjustment mechanism is arranged on the high-temperature air supply pipe 2, so that the high-temperature steam inside the high-temperature air supply pipe 2 is used to heat the low-temperature steam in the steam turbine air supply pipe 1 in the sealing gas heating pipe 3, so that the sealing gas output from the sealing gas heating pipe 3 to the steam turbine meets the temperature requirement, thereby avoiding condensation of the sealing gas to damage the steam turbine.

[0026] Specifically, the steam generated in the factory has high temperature and high pressure, and the sealing gas input to the steam turbine usually has low temperature and pressure. For example, the steam pressure input to the steam turbine is 2.0 MPa and the temperature requirement is 330°C.

[0027] In order to increase the temperature of the turbine sealing gas and avoid adding additional heating equipment to increase the cost, a high-temperature air supply pipe 2 is selected from the high-temperature and high-pressure steam pipeline generated in the factory and connected to the turbine air supply pipe 1. The air pressure of the high-temperature air supply pipe 2 is, for example, 9.8MPa, and the temperature is 510°C. At this time, the steam output by the high-temperature air supply pipe 2 and the steam output by the turbine air supply pipe 1 are mixed in the sealing gas heating pipe 3, so that the steam output by the sealing gas heating pipe 3 meets the temperature requirement of the turbine for the sealing gas, thereby ensuring the safe and stable operation of the turbine.

[0028] Among them, the diameter of the turbine air supply pipe 1 and the diameter of the sealing gas heating pipe 3 can both be selected as 80 mm, the diameter of the high-temperature air supply pipe 2 is 25 mm, the high-temperature air supply pipe 2 is connected to the sealing gas heating pipe 3, the high-temperature air supply pipe 2 is close to the air inlet end of the sealing gas heating pipe 3, and the turbine air supply pipe 1 is connected to the air inlet end of the sealing gas heating pipe 3.

[0029] In order to conveniently control the amount of steam output from the high-temperature air supply pipe 2 so that it can be mixed with the steam output from the turbine air supply pipe 1 to meet the sealing requirements of the turbine, the air supply flow rate of the high-temperature air supply pipe 2 is controlled by a temperature control regulating mechanism arranged on the sealing air temperature raising pipe 3.

[0030] For example, the temperature of the sealing gas is measured in real time at the output end of the sealing gas temperature raising tube 3, and the gas supply flow rate of the high-temperature gas supply pipe 2 is adjusted at the same time, so as to obtain the matching data of the gas supply flow rate of the high-temperature gas supply pipe 2 and the output temperature of the sealing gas, so that the flow rate of the high-temperature gas supply pipe 2 can be controlled by the temperature control mechanism according to the demand for the sealing gas temperature.

[0031] However, this method may affect the temperature of the high-temperature air supply pipe 2, the steam turbine air supply pipe 1 and the sealing air temperature raising pipe 3 due to the external environment, which may cause deviation in the sealing air temperature output to the steam turbine.

[0032] Therefore, it is preferred that the temperature control mechanism includes a pneumatic control valve a and a temperature transmitter b that is communicatively connected to the pneumatic control valve a; the pneumatic control valve a and the temperature transmitter b are both selected as commercially available products.

[0033] Among them, the pneumatic regulating valve a is set on the high-temperature gas supply pipe 2, and the temperature transmitter b is set on the sealing gas heating pipe 3, and the temperature transmitter b is close to the output end of the sealing gas heating pipe 3, so that the temperature of the sealing gas output can be obtained more accurately.

[0034] When in use, the temperature transmitter b sends a corresponding control signal to the pneumatic regulating valve a according to the temperature in the sealing gas temperature raising pipe 3, so that the pneumatic regulating valve a can adjust its opening in real time, control the supply amount of steam in the high-temperature gas supply pipe 2, and meet the accurate control of the sealing gas temperature.

[0035] Since the steam pressure inside the high-temperature gas supply pipe 2 is relatively high, in order to avoid excessive pressure in the sealed gas heating pipe 3 and damage to the equipment, it is preferred to provide a sealed gas vent pipe 4 on the sealed gas heating pipe 3 and a safety valve 5 on the sealed gas vent pipe 4.

[0036] The sealing gas vent pipe 4 is arranged at the front end of the temperature transmitter b, and the diameter of the sealing gas vent pipe 4 can be selected to be 25 mm.

[0037] In actual use, it is necessary to inspect and replace various components. Therefore, a front stop valve 6 and a rear stop valve 7 are set on the high-temperature air supply pipe 2, and the pneumatic regulating valve a is located between the front stop valve 6 and the rear stop valve 7.

[0038] When the pneumatic control valve a is repaired or replaced, the front stop valve 6 and the rear stop valve 7 can be closed to cut off the air, thereby ensuring a safe replacement environment.

[0039] Furthermore, in order to ensure the shutoff effect of the front stop valve 6, it is preferred that the number of the front stop valves 6 is two, and the two front stop valves 6 are arranged front and rear at the front end of the pneumatic control valve a.

[0040] At the same time, in order to avoid residual high-temperature steam in the pipe when replacing the pneumatic control valve a, a first shower pipe c is set between the pneumatic control valve a and the front stop valve 6, and a second shower pipe d is set between the pneumatic control valve a and the rear stop valve 7. Shower valves are set on the first shower pipe c and the second shower pipe d, and the diameter of the first shower pipe c and the diameter of the second shower pipe d can both be selected to be 15 mm.

[0041] Similarly, when replacing the safety valve and the temperature transmitter b, it is necessary to shut down the high-temperature air supply pipe 2 and the turbine air supply pipe 1 at the same time. At this time, a first sealing valve 8 is set at the output end of the turbine air supply pipe 1, and a second sealing blind plate 9 is set at the air inlet end of the sealing gas temperature raising pipe 3, so that the air supply of the turbine air supply pipe 1 is blocked by the first sealing valve 8 and the second sealing blind plate 9.

[0042] The second blocking blind plate 9 can be selected as an 8-shaped blind plate, which is easy to operate.

[0043] Obviously, the embodiments described above are only some embodiments of the utility model, not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0044] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A steam turbine seal gas temperature raising system, characterized in that: It comprises a steam turbine air supply pipe (1), a high-temperature air supply pipe (2), a sealing air temperature raising pipe (3) and a temperature control regulating mechanism; The gas delivery end of the high-temperature gas supply pipe (2) and the gas delivery end of the turbine gas supply pipe (1) are both connected to the gas inlet end of the sealing gas temperature raising pipe (3), and the temperature control adjustment mechanism is arranged on the high-temperature gas supply pipe (2).

2. The steam turbine seal gas temperature raising system according to claim 1, characterized in that: The temperature control mechanism comprises a pneumatic control valve (a) and a temperature transmitter (b), wherein the pneumatic control valve (a) is communicatively connected with the temperature transmitter (b), the pneumatic control valve (a) is arranged on a high-temperature air supply pipe (2), and the temperature transmitter (b) is arranged on a sealed air temperature raising pipe (3).

3. The steam turbine seal gas temperature raising system according to claim 2, characterized in that: The sealing gas temperature raising pipe (3) is connected to a sealing gas venting pipe (4), and a safety valve (5) is provided on the sealing gas venting pipe (4).

4. The steam turbine seal gas temperature raising system according to claim 3, characterized in that: The sealed air lift temperature pipe (3) is provided with a front stop valve (6) and a rear stop valve (7), and the pneumatic regulating valve (a) is located between the front stop valve (6) and the rear stop valve (7).

5. The steam turbine seal gas temperature raising system according to claim 4, characterized in that: The number of the front stop valves (6) is two, and the two front stop valves (6) are arranged front and rear.

6. The steam turbine seal gas temperature raising system according to claim 5, characterized in that: The high-temperature air supply pipe (2) is also provided with a first spray pipe (c) and a second spray pipe (d), wherein the first spray pipe (c) is provided between the front stop valve (6) and the pneumatic regulating valve (a), and the second spray pipe (d) is provided between the pneumatic regulating valve (a) and the rear stop valve (7).

7. The steam turbine seal gas temperature raising system according to claim 6, characterized in that: A first blocking valve (8) and a second blocking blind plate (9) are provided between the steam turbine air supply pipe (1) and the sealing air temperature raising pipe (3); the first blocking valve (8) is connected to the steam turbine air supply pipe (1), and the second blocking blind plate (9) is connected to the sealing air temperature raising pipe (3).

8. The steam turbine seal gas temperature raising system according to claim 7, characterized in that: The diameters of the turbine air supply pipe (1) and the sealing air temperature raising pipe (3) are both 80 mm, the diameter of the high-temperature air supply pipe (2) is 25 mm, and the diameter of the sealing air venting pipe (4) is 40 mm.

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