Multi-steam-source full-load mutual standby feed pump turbine

Abstract

The invention provides a multi-steam-source full-load mutual standby feed pump turbine, and relates to the technical field of feed pump turbine.The multi-steam-source full-load mutual standby feed pump turbine comprises a turbine, the turbine communicates with a feed pump through a first gas conveying pipe, and the two ends of the first gas conveying pipe communicate with a second gas conveying pipe and a third gas conveying pipe correspondingly; adjusting valves are arranged on the first gas conveying pipe, the second gas conveying pipe and the third gas conveying pipe respectively, pipeline cleaning mechanisms are arranged in the first gas conveying pipe, the second gas conveying pipe and the third gas conveying pipe, and a gas source output by the steam turbine is divided into three paths of steam sources through a fourth path of exhaust, auxiliary steam and unheated reheat steam cold section; the steam supply requirements of three paths of steam sources for providing different loads are conveyed into the water feeding pump through the first gas conveying pipe, the second gas conveying pipe and the third gas conveying pipe respectively, the water feeding pump turbine is provided with a standby steam source under the full-load working condition, the steam sources can be rapidly switched, the safety of stable operation of a unit is improved, and the working efficiency is improved. And the pipeline cleaning mechanism is used for cleaning the first gas conveying pipe, the second gas conveying pipe and the third gas conveying pipe.

Description

Technical Field

[0001] The present invention relates to the technical field of feedwater pump steam turbines, and in particular to a feedwater pump steam turbine with multiple steam sources serving as backup for each other at full load. Background Art

[0002] A power plant is a power plant that converts some form of raw energy into electrical energy for fixed facilities or transportation, such as thermal, hydroelectric, steam, diesel or nuclear power plants.

[0003] Traditionally, the steam source of the feedwater pump steam turbine of a power plant is single, and three-way steam source load sharing control is generally used in the selection of the feedwater pump steam turbine. However, load sharing control will result in a long time to switch the steam source of the feedwater pump steam turbine during the critical load steam source cutting process, and the steam source of the feedwater pump steam turbine cannot be switched quickly and safely, and the full-load standby steam source cannot be provided for the feedwater pump steam turbine, which seriously affects the safe and economical operation of the unit when the unit load changes rapidly and drastically.

[0004] At present, when switching the steam source for the feedwater pump turbine in most power plants, manual labor is required to switch the gas source on-site, which is not only a huge waste of manpower but also inefficient.

[0005] Therefore, it is particularly important to design a feedwater pump turbine with multiple steam sources and full load backup. Summary of the invention

[0006] The present invention provides a feedwater pump steam turbine with multiple steam sources and full load as backup for each other, so as to solve the defects in the prior art.

[0007] The present invention provides a feedwater pump steam turbine with multiple steam sources and full load as standby for each other, comprising: a steam turbine, wherein the steam turbine is connected to a feedwater pump through a first air pipe, the two ends of the first air pipe are respectively connected to the second air pipe and the third air pipe, the first air pipe, the second air pipe and the third air pipe are respectively provided with regulating valves, and the first air pipe, the second air pipe and the third air pipe are provided with pipeline cleaning mechanisms.

[0008] Preferably, the pipeline cleaning mechanism includes a guide rod, the guide rod passes through the first air pipe and is fixed on the inner wall of the air delivery cavity of the second air pipe and the third air pipe, the guide rod is sleeved with two rotating components, the two rotating components are sleeved with a rotating sleeve, cleaning cones are respectively provided at both ends of the rotating sleeve, a first buffer spring is provided on the cleaning cone, an impeller is provided on the rotating sleeve, fixed disks are respectively provided on the rotating sleeves at both ends of the impeller, air holes are provided on the fixed disks, cleaning sleeves are provided on the two fixed disks, and a cleaning brush is provided on the cleaning sleeve.

[0009] Preferably, the rotating assembly comprises a rotating ring, a plurality of rotating cavities are arranged in the rotating ring, a rotating ball is arranged in the rotating cavity, a buffer cavity is arranged on one side of the rotating cavity, and a second buffer spring is arranged in the buffer cavity.

[0010] Preferably, the first gas pipeline, the second gas pipeline and the third gas pipeline are respectively provided with air pressure valves.

[0011] Preferably, it also includes:

[0012] The speed detection module is used to measure the rotation speed of the impeller in the steam turbine;

[0013] Steam flow angle detection module 1, used to measure the inlet steam flow angle of the preset impeller moving blades;

[0014] Steam flow angle detection module 2, used to measure the outlet steam flow angle of the preset impeller moving blades;

[0015] A calculation module 1 is used to calculate the heat transfer coefficient of the convective heat transfer surface of the impeller in the steam turbine based on the rotation speed of the impeller in the steam turbine;

[0016] The calculation module 2 is used to calculate the total heat transfer coefficient of the steam turbine impeller based on the calculation module 1;

[0017] An alarm module, used for issuing an alarm;

[0018] A processing module, used for comparing the total heat transfer coefficient of the steam turbine impeller obtained by the calculation module 1 with the total heat transfer coefficient of the standard steam turbine impeller;

[0019] Control module, when the total heat transfer coefficient of the steam turbine impeller is greater than or equal to the total heat transfer coefficient of the standard steam turbine impeller, the control alarm module will sound an alarm and control the steam turbine to stop working. When the total heat transfer coefficient of the steam turbine impeller is less than the total heat transfer coefficient of the standard steam turbine impeller, the steam turbine will work normally.

[0020] Preferably, the calculation module 1 calculates based on the following formula 1:

[0021]

[0022] J is the heat transfer coefficient of the impeller of the steam turbine for convective heat transfer, V1 is the rotation speed of the impeller in the steam turbine, V2 is the limit rotation speed of the impeller in the steam turbine, H is the blade height of the impeller moving blade, d is the axial width of the impeller moving blade, b1 is the blade chord length of the impeller moving blade, θ1 is the inlet steam flow angle of the preset impeller moving blade, θ2 is the outlet steam flow angle of the preset impeller moving blade, l is the spacing of the impeller moving blade cascade section, Re is the Reynolds number of steam, pr is the Prandtl number of steam, and ε1 is the thermal conductivity of steam;

[0023] The calculation module 2 is calculated based on the following formula 2:

[0024]

[0025] S is the total heat transfer coefficient of the turbine impeller, r1 is the radius of the turbine impeller rim, r2 is the radius of the turbine impeller, b2 is the thickness of the impeller blade, D1 is the axial width of the turbine impeller rim, D2 is the axial width of the turbine impeller, k1 is the temperature constant, and ε2 is the thermal conductivity of the impeller material.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The gas source output by the steam turbine is divided into three steam sources through the fourth exhaust, auxiliary steam, and unheated reheat steam cold section. The three steam sources provide steam supply requirements for different loads, and then the fourth exhaust, auxiliary steam, and unheated reheat steam cold section three steam sources are respectively transported to the feed water pump through the first gas pipeline, the second gas pipeline, and the third gas pipeline. Open the corresponding regulating valve and close the unnecessary regulating valve to switch the required gas pipeline, and switch to the appropriate gas source according to the demand of the feed water pump in time to ensure the feed water pump under full load conditions. The water pump and steam turbine can have a backup steam source, and the steam source can be switched quickly, flexibly and safely when the unit is tripping, load shedding, starting or stopping, etc., shortening the unit recovery time. This not only improves the safety and stability of the unit's water supply system operation, but also increases the safety of the unit's stable operation. The pipeline cleaning mechanism cleans the first gas pipe, the second gas pipe and the third gas pipe to prevent blockage at the connection of the first gas pipe, the second gas pipe and the third gas pipe, thereby hindering the transportation of steam and improving the operating efficiency of the feed water pump and the steam turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a schematic diagram of the overall structure provided by an embodiment of the present invention;

[0031] Figure 2 It is a schematic diagram of the internal structure provided by an embodiment of the present invention;

[0032] Figure 3 is a schematic cross-sectional structure diagram of a pipeline cleaning mechanism provided by an embodiment of the present invention;

[0033] Figure 4 yes Figure 3Schematic diagram of the cross-sectional structure of part A.

[0034] Reference numerals:

[0035] 1. Steam turbine; 2. Feed water pump; 3. First air pipe; 31. Air cavity; 4. Second air pipe; 5. Third air pipe; 6. Pipe cleaning mechanism; 61. Guide rod; 62. Rotating assembly; 621. Rotating ring; 622. Rotating cavity; 623. Rotating ball; 624. Buffer cavity; 625. Second buffer spring; 63. Rotating sleeve; 64. Cleaning cone; 65. First buffer spring; 66. Impeller; 67. Fixed plate; 671. Air hole; 68. Cleaning sleeve; 69. Cleaning brush; 7. Regulating valve; 8. Air pressure valve. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] The present invention provides the following embodiments

[0039] Example 1

[0040] The embodiment of the present invention provides a feedwater pump steam turbine with multiple steam sources at full load and serving as backup for each other, such as Figure 1-Figure 4As shown, it includes: a steam turbine 1, the steam turbine 1 is connected to a feed water pump 2 through a first air pipe 3, the two ends of the first air pipe 3 are respectively connected to the second air pipe 4 and the third air pipe 5, the first air pipe 3, the second air pipe 4, and the third air pipe 5 are respectively provided with regulating valves 7, and the first air pipe 3, the second air pipe 4, and the third air pipe 5 are provided with pipeline cleaning mechanisms 6.

[0041] The working principle and beneficial effects of the above technical solution are as follows: the gas source output by the steam turbine 1 is divided into three steam sources through the fourth exhaust, auxiliary steam, and unheated reheat steam cold section, and the three steam sources provide steam supply requirements of different loads, and then the fourth exhaust, auxiliary steam, and unheated reheat steam cold section three steam sources are respectively transported to the feed water pump 2 through the first gas pipeline 3, the second gas pipeline 4, and the third gas pipeline 5, open the corresponding regulating valve 7 and close the unnecessary regulating valve 7 to switch the required gas pipeline, and switch to the gas source with appropriate load in time according to the demand of the feed water pump 2, to ensure that Under full-load conditions, the feedwater pump 2 and the steam turbine 1 can have a backup steam source. In the event of unit tripping, load shedding, start-up and shutdown, the steam source can be switched quickly, flexibly and safely, shortening the unit recovery time, thereby improving the safety and stability of the unit's feedwater system operation and increasing the safety of the unit's stable operation. The pipeline cleaning mechanism 6 cleans the first gas pipe 3, the second gas pipe 4, and the third gas pipe 5 to prevent blockage at the connection between the first gas pipe 3, the second gas pipe 4, and the third gas pipe 5, thereby hindering the transportation of steam and improving the operating efficiency of the feedwater pump 2 and the steam turbine 1.

[0042] Example 2

[0043] On the basis of Example 1, Figure 1-Figure 4 As shown, the pipeline cleaning mechanism 6 includes a guide rod 61, and the guide rod 61 passes through the first air delivery pipe 3 and is fixedly arranged on the inner wall of the air delivery cavity 31 of the second air delivery pipe 4 and the third air delivery pipe 5. Two rotating components 62 are sleeved on the guide rod 61, and the two rotating components 62 are sleeved on a rotating sleeve 63. Cleaning cones 64 are respectively provided at both ends of the rotating sleeve 63, and a first buffer spring 65 is provided on the cleaning cone 64. An impeller 66 is provided on the rotating sleeve 63, and fixed disks 67 are respectively provided on the rotating sleeves 63 at both ends of the impeller 66. The fixed disks 67 are provided with air holes 671, and cleaning sleeves 68 are provided on the two fixed disks 67, and a cleaning brush 69 is provided on the cleaning sleeve 68.

[0044] The working principle and beneficial effects of the above technical solution are as follows: steam with different loads is respectively transported from the air delivery chamber 31 in the first air delivery pipe 3, the second air delivery pipe 4 and the third air delivery pipe 5 to the water supply pump 2; the inner walls of the air delivery chamber 31 of the second air delivery pipe 4 and the third air delivery pipe 5 fix the guide rod 61; the guide rod 61 limits the two rotating components 62; the rotating components 62 move along the length direction of the guide rod 61; the two rotating components 62 support and fix the rotating sleeve 63; the two rotating sleeves 63 respectively fix the two cleaning cones 64; the inner wall of the cleaning cone 64 fits the outer surface of the guide rod 61; the conical surface of the cleaning cone 64 fixes one end of the first buffer spring 65; the rotating sleeve 63 and the two cleaning cones 64 move synchronously with the two rotating components 62 on the guide rod 61; the rotating sleeve 63 The impeller 66 and the two fixed plates 67 are fixed, the two fixed plates 67 fix the cleaning sleeve 68, the cleaning sleeve 68 fixes the cleaning brush 69, the air holes 671 on the fixed plate 67 allow the steam to pass through the fixed plate to act on the impeller 66 to generate a push, and the impeller 66 rotates and moves under the action of the thrust, and the impeller 66 drives the cleaning brush 69, the cleaning sleeve 68, the fixed plate 67, the rotating sleeve 63, the two cleaning cones 64, and the two rotating components 62 to move along the guide rod 61 in the air delivery cavity 31 at the connection of the first air delivery pipe 3, the second air delivery pipe 4, and the third air delivery pipe 5, the cleaning brush 69 rotates and cleans the inner wall of the air delivery cavity 31 of the first air delivery pipe 3, the second air delivery pipe 4, and the third air delivery pipe 5, and the cleaning cone 64 scrapes the outer surface of the guide rod 61;

[0045] When the first gas pipe 3 and the third gas pipe 5 are closed, and the second gas pipe 4 is opened for ventilation, the steam in the second gas pipe 4 exerts a force on the impeller 66, and the impeller 66 drives the cleaning brush 69, the cleaning sleeve 68, the fixed plate 67, the rotating sleeve 63, the two cleaning cones 64, and the two rotating components 62 to move toward the third gas pipe 5 along the guide rod 61 while rotating. When moving to the connection between the guide rod 61 and the inner wall of the gas delivery cavity 31 of the third gas pipe 5, the first buffer spring 65 facing the side of the third gas pipe 5 collides with the inner wall of the gas delivery cavity 31 of the third gas pipe 5, and the cleaning cone 64 facing the third gas pipe 5 does not collide with the inner wall of the gas delivery cavity 31 of the third gas pipe 5, thereby preventing the cleaning cone 64 from damaging the inner wall of the gas delivery cavity 31 of the third gas pipe 5;

[0046] When the first gas pipe 3 and the second gas pipe 4 are closed, and the third gas pipe 5 is opened for ventilation, the steam in the third gas pipe 5 exerts a force on the impeller 66, and the impeller 66 drives the cleaning brush 69, the cleaning sleeve 68, the fixed plate 67, the rotating sleeve 63, the two cleaning cones 64, and the two rotating components 62 to move along the guide rod 61 toward the second gas pipe 4. When moving to the connection between the guide rod 61 and the inner wall of the gas cavity 31 of the second gas pipe 4, the first buffer spring 65 facing the side of the second gas pipe 4 collides with the inner wall of the gas cavity 31 of the second gas pipe 4, and the cleaning cone 64 facing the second gas pipe 4 does not collide with the inner wall of the gas cavity 31 of the second gas pipe 4, thereby preventing the cleaning cone 64 from damaging the inner wall of the gas cavity 31 of the second gas pipe 4.

[0047] When the second gas pipeline 4 and the third gas pipeline 5 are closed and the first gas pipeline 3 is opened for ventilation, the pipeline cleaning mechanism 6 does not clean the first gas pipeline 3 , the second gas pipeline 4 , and the third gas pipeline 5 .

[0048] Example 3

[0049] On the basis of Example 2, Figure 1-Figure 4 As shown, the rotating assembly 62 includes a rotating ring 621, a plurality of rotating cavities 622 are arranged in the rotating ring 621, a rotating ball 623 is arranged in the rotating cavity 622, a buffer cavity 624 is arranged on one side of the rotating cavity 622, and a second buffer spring 625 is arranged in the buffer cavity 624.

[0050] The working principle and beneficial effects of the above technical solution are as follows: the rotating ring 621 is sleeved on the guide rod 61, the rotating cavity 622 performs rolling limit on the rotating ball 623, the rotating ball 623 supports the rotating ring 621, the buffer cavity 624 limits the second buffer spring 625, and multiple second buffer springs 625 elastically limit the rotating ball 623. The rotating ring 621 moves along the guide rod 61 by relying on the two rotating balls 623 therein. The spherical rolling mode of the rotating ball 623 facilitates the rotational movement of the rotating ring 621 on the guide rod 61, and the rolling friction reduces the wear between the rotating ring 621 and the guide rod 61.

[0051] Example 4

[0052] On the basis of Example 3, Figure 1-Figure 4 As shown, the first gas pipeline 3 , the second gas pipeline 4 , and the third gas pipeline 5 are respectively provided with air pressure valves 8 .

[0053] The working principle and beneficial effects of the above technical solution are: by respectively setting the air pressure valves 8 on the first air pipeline 3, the second air pipeline 4, and the third air pipeline 5, the air pressure in each air pipeline is monitored in real time to prevent equipment failure caused by too low or too high air pressure, so as to take timely prevention measures.

[0054] Example 5

[0055] On the basis of Example 4, it also includes:

[0056] A rotation speed detection module, used to measure the rotation speed of the impeller 66 in the steam turbine 1;

[0057] Steam flow angle detection module 1, used to measure the inlet steam flow angle of the impeller 66 moving blades;

[0058] Steam flow angle detection module 2, used to measure the outlet steam flow angle of the impeller 66 moving blades;

[0059] A calculation module 1, for calculating the heat transfer coefficient of the convective heat transfer surface of the impeller 66 in the steam turbine 1 based on the rotation speed of the impeller 66 in the steam turbine 1;

[0060] A calculation module 2 is used to calculate the total heat transfer coefficient of the rim of the impeller 66 of the steam turbine 1 based on the calculation module 1;

[0061] An alarm module, used for issuing an alarm;

[0062] A processing module, used for comparing the total heat transfer coefficient of the rim of the impeller 66 of the steam turbine 1 obtained by the calculation module 1 with the total heat transfer coefficient of the rim of the impeller 66 of the standard steam turbine 1;

[0063] The control module, when the total heat transfer coefficient of the rim of the impeller 66 of the steam turbine 1 is greater than or equal to the total heat transfer coefficient of the rim of the impeller 66 of the standard steam turbine 1, the control alarm module will issue an alarm and control the steam turbine 1 to stop working. When the total heat transfer coefficient of the rim of the impeller 66 of the steam turbine 1 is less than the total heat transfer coefficient of the rim of the impeller 66 of the standard steam turbine 1, the steam turbine 1 will work normally.

[0064] The working principle and beneficial effects of the above technical solution are as follows: the rotation speed detection module measures the rotation speed of the impeller 66 in the steam turbine 1, the steam flow angle detection module 1 measures the inlet steam flow angle of the impeller 66 moving blades, the steam flow angle detection module 2 measures the outlet steam flow angle of the impeller 66 moving blades, the calculation module 1 calculates the heat transfer coefficient of the convective heat transfer surface of the impeller 66 in the steam turbine 1 based on the rotation speed of the impeller 66 in the steam turbine 1, the calculation module 2 calculates the total heat transfer coefficient of the rim of the impeller 66 of the steam turbine 1 based on the calculation module 1, and the alarm module is used to issue an alarm. The processing module compares the total heat transfer coefficient of the impeller 66 rim of the steam turbine 1 obtained by the calculation module 1 with the total heat transfer coefficient of the impeller 66 rim of the standard steam turbine 1. When the total heat transfer coefficient of the impeller 66 rim of the steam turbine 1 is greater than or equal to the total heat transfer coefficient of the impeller 66 rim of the standard steam turbine 1, the control module controls the alarm module to issue an alarm and control the steam turbine 1 to stop working. When the total heat transfer coefficient of the impeller 66 rim of the steam turbine 1 is less than the total heat transfer coefficient of the impeller 66 rim of the standard steam turbine 1, the steam turbine 1 works normally.

[0065] Example 6

[0066] Based on Example 5, the calculation module 1 calculates based on the following formula 1:

[0067]

[0068] J is the heat transfer coefficient of the convective heat transfer surface of the impeller in the steam turbine 1, V1 is the rotation speed of the impeller in the steam turbine 1, V2 is the limit rotation speed of the impeller in the steam turbine 1, H is the blade height of the impeller moving blade, d is the axial width of the impeller moving blade, b1 is the blade chord length of the impeller moving blade, θ1 is the inlet steam flow angle of the preset impeller moving blade, θ2 is the outlet steam flow angle of the preset impeller moving blade, l is the spacing of the impeller moving blade blade section, Re is the Reynolds number of steam, pr is the Prandtl number of steam, and ε1 is the thermal conductivity of steam;

[0069] The calculation module 2 is calculated based on the following formula 2:

[0070]

[0071] S is the total heat transfer coefficient of the impeller of steam turbine 1, r1 is the radius of the impeller rim of steam turbine 1, r2 is the radius of the impeller of steam turbine 1, b2 is the thickness of the impeller moving blade, D1 is the axial width of the impeller rim of steam turbine 1, D2 is the axial width of the impeller of steam turbine 1, k1 is the temperature constant, and ε2 is the thermal conductivity of the impeller material.

[0072] The working principle and beneficial effects of the above technical solution are: Calculate the heat transfer coefficient of the impeller surface of turbine 1 by The total heat transfer coefficient of the impeller of steam turbine 1 is calculated. When the total heat transfer coefficient of the impeller of steam turbine 1 is greater than or equal to the total heat transfer coefficient of the impeller of standard steam turbine 1, the control module controls the alarm module to sound an alarm and controls steam turbine 1 to stop working. When the total heat transfer coefficient of the impeller of steam turbine 1 is less than the total heat transfer coefficient of the impeller of standard steam turbine 1, steam turbine 1 works normally.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A feedwater pump steam turbine with multiple steam sources at full load and serving as backup for each other, characterized in that: include: A steam turbine (1), the steam turbine (1) being connected to a feed water pump (2) via a first air pipeline (3), the two ends of the first air pipeline (3) being connected to the second air pipeline (4) and the third air pipeline (5), respectively, the first air pipeline (3), the second air pipeline (4) and the third air pipeline (5) being provided with regulating valves (7), respectively, and the first air pipeline (3), the second air pipeline (4) and the third air pipeline (5) being provided with pipeline cleaning mechanisms (6).

2. A feedwater pump steam turbine with multiple steam sources and full load as backup for each other according to claim 1, characterized in that: The pipeline cleaning mechanism (6) comprises a guide rod (61), the guide rod (61) passes through the first air delivery pipe (3) and is fixedly arranged on the inner wall of the air delivery cavity (31) of the second air delivery pipe (4) and the third air delivery pipe (5), the guide rod (61) is sleeved with two rotating components (62), the two rotating components (62) are sleeved with a rotating sleeve (63), cleaning cones (64) are respectively arranged at both ends of the rotating sleeve (63), a first buffer spring (65) is arranged on the cleaning cone (64), an impeller (66) is arranged on the rotating sleeve (63), fixed disks (67) are respectively arranged on the rotating sleeve (63) at both ends of the impeller (66), the fixed disk (67) is provided with an air hole (671), the two fixed disks (67) are provided with a cleaning sleeve (68), and the cleaning sleeve (68) is provided with a cleaning brush (69).

3. A feedwater pump steam turbine with multiple steam sources and full load as backup for each other according to claim 2, characterized in that: The rotating assembly (62) comprises a rotating ring (621), a plurality of rotating cavities (622) are arranged in the rotating ring (621), a rotating ball (623) is arranged in the rotating cavity (622), a buffer cavity (624) is arranged on one side of the rotating cavity (622), and a second buffer spring (625) is arranged in the buffer cavity (624).

4. A feedwater pump steam turbine with multiple steam sources and full load as backup for each other according to claim 3, characterized in that: The first gas supply pipe (3), the second gas supply pipe (4), and the third gas supply pipe (5) are respectively provided with air pressure valves (8).

5. The feedwater pump steam turbine with multiple steam sources and full load as backup for each other according to claim 4, characterized in that: Also includes: A rotation speed detection module, used for measuring the rotation speed of an impeller (66) in a steam turbine (1); A calculation module 1, used for calculating the heat transfer coefficient of the convective heat transfer surface of the impeller (66) in the steam turbine (1) based on the rotation speed of the impeller (66) in the steam turbine (1); A calculation module 2, used for calculating the total heat transfer coefficient of the wheel rim of the steam turbine (1) impeller (66) based on the calculation module 1; An alarm module, used for issuing an alarm; A processing module, used for comparing the total heat transfer coefficient of the impeller (66) rim of the steam turbine (1) obtained by the calculation module 1 with the total heat transfer coefficient of the impeller (66) rim of the standard steam turbine (1); The control module controls the alarm module to sound an alarm when the total heat transfer coefficient of the impeller (66) rim of the steam turbine (1) is greater than or equal to the total heat transfer coefficient of the impeller (66) rim of the standard steam turbine (1) and controls the steam turbine (1) to stop working. When the total heat transfer coefficient of the impeller (66) rim of the steam turbine (1) is less than the total heat transfer coefficient of the impeller (66) rim of the standard steam turbine (1), the steam turbine (1) works normally.

6. A feedwater pump steam turbine with multiple steam sources and full load as backup for each other according to claim 5, characterized in that: The calculation module 1 calculates based on the following formula 1: J is the heat transfer coefficient of the convective heat transfer surface of the impeller in the steam turbine (1), V1 is the rotation speed of the impeller in the steam turbine (1), V2 is the limit rotation speed of the impeller in the steam turbine (1), H is the blade height of the impeller moving blade, d is the axial width of the impeller moving blade, b1 is the blade chord length of the impeller moving blade, θ1 is the inlet steam flow angle of the preset impeller moving blade, θ2 is the outlet steam flow angle of the preset impeller moving blade, l is the spacing of the impeller moving blade blade section, Re is the Reynolds number of steam, pr is the Prandtl number of steam, and ε1 is the thermal conductivity of steam; The calculation module 2 is calculated based on the following formula 2: S is the total heat transfer coefficient of the impeller of the steam turbine (1), r1 is the radius of the impeller rim of the steam turbine (1), r2 is the radius of the impeller of the steam turbine (1), b2 is the thickness of the impeller blades, D1 is the axial width of the impeller rim of the steam turbine (1), D2 is the axial width of the impeller of the steam turbine (1), k1 is the temperature constant, and ε2 is the thermal conductivity of the impeller material.

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