Preheating mechanism of steam turbine of thermal power plant

Abstract

The preheating mechanism of the steam turbine of the thermal power plant comprises a turbine operating mechanism and a heat removal adjusting mechanism, an air pressure input assembly installed in a sleeved mode is arranged on one set of outer sides of the turbine operating mechanism, and preheating assemblies connected with the air pressure input assembly in a sleeved mode are arranged on the two sides of one end of the turbine operating mechanism. And the outer side of the other set of turbine operation mechanism is provided with an air pressure exhaust assembly which is installed in a sleeved mode. According to the device, after an exhaust fan is started after an air outlet valve operates, preheated air mass is discharged through a fan cover, the exhaust fan, the air outlet valve, a third connecting pipe and a pressure adjusting pipe, and an installed air cylinder outputs power to drive an output end to operate; and after the air cylinder outputs power to perform telescopic operation, the effect of alternate reciprocating operation is achieved under the mutual cooperation of the telescopic rod and the pressing plug, so that the exhaust speed of high-temperature gas can be reduced, and the deep and uniform preheating effect can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of thermal power steam turbines, in particular to a preheating mechanism for a steam turbine in a thermal power plant. Background Art

[0002] A steam turbine, also known as a steam turbine engine, is a rotary steam-powered device. High-temperature, high-pressure steam passes through a fixed nozzle, becoming an accelerated airflow and then spraying onto blades, causing the bladed rotor to rotate and simultaneously perform work. Steam turbines are a staple of modern thermal power plants and are also used in the metallurgical and chemical industries, as well as in ship propulsion systems. They are externally-combustion rotary machines that convert steam thermal energy into mechanical work. Steam from the boiler enters the turbine and passes through a series of annular nozzles and moving blades, converting the steam's thermal energy into mechanical energy that rotates the turbine rotor. Steam undergoes energy conversion in different ways within the turbine, resulting in turbines with different operating principles. The turbine consists of a rotating part and a stationary part. The rotor includes the main shaft, impeller, moving blades, and couplings. The stator includes the steam inlet, cylinder, diaphragm and stator cascade, steam seals, and bearings. Steam turbines are primarily used in power generation, aviation, shipbuilding, and chemical industries. Turbine cylinder preheating utilizes compressed hot air from the turbine's cylinder rapid cooling system to backflow into the cylinder for heating.

[0003] When the preheating mechanism of the existing steam turbine is in use, such as application number CN202221987578.7, it relates to a steam turbine preheating device, which includes a compressed air pipeline and a steam turbine cylinder. The outer wall of the steam turbine cylinder is provided with multiple annular preheating layers. The output port of the compressed air pipeline is connected to a main delivery pipeline. The other end of the main delivery pipeline is connected to multiple first delivery branch pipelines. The multiple first delivery branch pipelines are respectively connected to multiple annular preheating layers through multiple preheating mechanisms. When the present invention is in use, the compressed hot air is introduced into the upper and lower sides of the annular preheating layer through the fourth delivery branch pipe and the fifth delivery branch pipe. In this way, the uneven heating of the upper and lower sides of the turbine cylinder can be avoided. At the same time, the flow rate of the compressed hot air can be controlled by the throttle valve, so that the preheating speed can be adjusted according to demand. A plurality of annular preheating layers are arranged on the outer wall of the turbine cylinder, which can ensure that the turbine cylinder is heated evenly in the axial position. However, in the above technology, the preheating is mainly on the outer side of the turbine. It is difficult to preheat the interior of the turbine after the exterior is heated, and its uniformity is still poor. For this reason, we propose a preheating mechanism for a steam turbine in a thermal power plant to solve the above problem. Summary of the Invention

[0004] In view of the above problems, the present invention proposes a preheating mechanism for a steam turbine in a thermal power plant, which can reduce the discharge speed of high-temperature gas and thereby achieve a deep and uniform preheating effect.

[0005] To achieve the above object, the present invention provides the following technical solutions: A preheating mechanism for a steam turbine in a thermal power plant includes a turbine operating mechanism and a heat exhaust regulating mechanism, wherein a sleeve-mounted air pressure input assembly is provided on one group of outer sides of the turbine operating mechanism, and preheating assemblies sleeve-connected to the air pressure input assembly are provided on both sides of one end of the turbine operating mechanism, a sleeve-mounted air pressure exhaust assembly is provided on the other group of outer sides of the turbine operating mechanism, and a heat exhaust regulating mechanism sleeve-connected to the air pressure exhaust assembly is provided on both sides of the other end of the turbine operating mechanism.

[0006] As a further technical solution, the turbine operating mechanism includes a base plate, a fixed base frame, a bolt bracket, a duct compartment, a sound insulation board, an air intake protective cover, an exhaust protective cover, an axle beam frame, an output shaft, turbine blades and a generator set. The top of the base plate is provided with a fixed base frame, and the top of the fixed base frame is provided with a bolt bracket assembled with bolts, the top of the bolt bracket is provided with a duct compartment assembled with bolts, and the side of the duct compartment is provided with a fitting sound insulation board.

[0007] As a further technical solution, one end of the duct compartment is provided with an air intake protective cover which is bolted on, and the other end of the duct compartment is provided with an exhaust protective cover which is bolted on, an axle beam frame is provided on the inner side of the duct compartment, and an output shaft is provided on the opposite side of the axle beam frame, a turbine blade is provided on the outer side of the output shaft, and the output end of the output shaft passes through the axle beam frame and is connected to a generator set.

[0008] As a further technical solution, the air pressure input assembly includes an end sleeve cover, a heat-insulating and pressure-maintaining tube, a first connecting tube, a pressure inlet valve and a pressure inlet port. The end sleeve cover is sleeve-connected to the outer end side of the air intake protective cover. A heat-insulating and pressure-maintaining tube is provided on the outer side of the middle part of the end sleeve cover, and a first connecting tube is provided at one end of the heat-insulating and pressure-maintaining tube. A pressure inlet valve is provided at one end of the first connecting tube, and a pressure inlet port is provided at one end of the pressure inlet valve.

[0009] As a further technical solution, the preheating assembly includes a first bolt rack, a heating pipe, a flower-shaped block, a heating rod, a temporary storage compartment, an air intake valve and an air intake port. The first bolt rack is bolted to the outside of one end of the duct compartment, and the inside of one end of the first bolt rack is provided with an annularly distributed flower-shaped block on the inner side of the heating pipe, and a heating rod is provided on the opposite side of the flower-shaped block. The output end of the heating pipe is provided with a temporary storage compartment, and one end of the temporary storage compartment is provided with a sleeve-connected air intake valve, and one end of the air intake valve is provided with an air intake port.

[0010] As a further technical solution, the air pressure discharge assembly includes an end cover sleeve, a branch tube, a circular fin, a three-way plate, an angle tube, a second connecting pipe, a pressure outlet valve and a pressure outlet port. The end cover sleeve is arranged on the outer side of the exhaust protective cover, and the output end of the end cover sleeve is provided with a branch tube connected in a socket-type manner, and the outer side of the branch tube is provided with a circular fin installed in a socket-type manner, and the output end of the branch tube is provided with a three-way plate.

[0011] As a further technical solution, an angle tube is provided on the outer side of the middle part of the three-way plate, and a second connecting tube with a sleeve connection is provided at one end of the angle tube, a pressure outlet valve is provided at one end of the second connecting tube, and a pressure outlet port with a sleeve connection is provided at one end of the pressure outlet valve.

[0012] As a further technical solution, the heat exhaust regulating mechanism includes a second bolt rack, an air hood, an exhaust fan, an air outlet valve, a third connecting pipe, a pressure regulating pipe, a cylinder, a telescopic rod and a pressure plug. The second bolt rack is bolted to the outside of the other end of the duct compartment, an air hood is provided on the outside of one end of the second bolt rack, and an exhaust fan is provided at one end of the air hood, an air outlet valve is provided at the other end of the air hood, and a third connecting pipe is provided at one end of the air outlet valve.

[0013] As a further technical solution, a sleeve-mounted pressure-regulating tube is provided at one end of the third connecting tube, and a cylinder is provided at the outer end of the pressure-regulating tube, a telescopic rod is provided at the output end of the cylinder, and a pressure plug is provided at one end of the telescopic rod.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The device of the invention mainly utilizes that after the exhaust valve is operated, the exhaust fan is turned on, and the wind hood, exhaust fan, exhaust valve, third connecting pipe and pressure regulating pipe are used to discharge the preheated air mass, and the output power of the installed cylinder drives the output end to operate, so that after the cylinder output power is telescopically operated, the telescopic rod and the pressure plug cooperate with each other to achieve the effect of alternating reciprocating operation, thereby reducing the discharge speed of the high-temperature gas and achieving a deep and uniform preheating effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The figure is a schematic structural diagram of a preheating mechanism of a steam turbine in a thermal power plant; Figure 2 It is a schematic diagram of the structure of the present invention from a side view; Figure 3 It is a schematic structural diagram of a cross section in the present invention; Figure 4 It is a structural schematic diagram of the turbine operating mechanism in the present invention; Figure 5 Schematic diagram of the structure of the preheating component in the present invention; Figure 6 It is a structural schematic diagram of the heat exhaust adjustment mechanism in the present invention.

[0016] In the figure: 1. Turbine operating mechanism; 101. Bottom plate; 102. Fixed base frame; 103. Bolt bracket; 104. Ducted compartment; 105. Sound insulation board; 106. Inlet protective cover; 107. Exhaust protective cover; 108. Axle beam frame; 109. Output shaft; 1010. Turbine blades; 1011. Generator set; 2. Air pressure input assembly; 201. End sleeve cover; 202. Insulation and pressure pipe; 203. First connecting pipe; 204. Inlet valve; 205. Pressure inlet; 3. Preheating assembly; 301. First bolt bracket; 302. Heating pipe; 303. Flower Block; 304, heating rod; 305, temporary storage compartment; 306, air inlet valve; 307, air inlet port; 4, air pressure discharge assembly; 401, end cover sleeve; 402, branching capillary; 403, circular fin; 404, three-way plate; 405, angle tube; 406, second connecting pipe; 407, pressure outlet valve; 408, pressure outlet port; 5, heat exhaust regulating mechanism; 501, second bolt rack; 502, wind hood; 503, exhaust fan; 504, air outlet valve; 505, third connecting pipe; 506, pressure regulating pipe; 507, cylinder; 508, telescopic rod; 509, pressure plug. DETAILED DESCRIPTION

[0017] In the description of the present invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used solely to facilitate description and simplify the description of the present invention. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features referred to. Thus, a feature specified as "first," "second," and the like may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0018] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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 making creative efforts are within the scope of protection of the present invention. Example

[0020] See also Figure 1-6 In an embodiment of the present invention, a preheating mechanism of a steam turbine in a thermal power plant includes a turbine operating mechanism 1 and a heat exhaust regulating mechanism 5. A group of outer sides of the turbine operating mechanism 1 are provided with a sleeve-mounted air pressure input component 2, and two sides of one end of the turbine operating mechanism 1 are provided with preheating components 3 sleeve-connected to the air pressure input component 2. Another group of outer sides of the turbine operating mechanism 1 are provided with a sleeve-mounted air pressure exhaust component 4, and two sides of the other end of the turbine operating mechanism 1 are provided with a heat exhaust regulating mechanism 5 sleeve-connected to the air pressure exhaust component 4.

[0021] The turbine operating mechanism 1 includes a base plate 101, a fixed base frame 102, a bolt bracket 103, a duct compartment 104, a sound insulation board 105, an air intake protective cover 106, an exhaust protective cover 107, an axle beam frame 108, an output shaft 109, a turbine blade 1010 and a generator set 1011. The top of the base plate 101 is provided with a fixed base frame 102, and the top of the fixed base frame 102 is provided with a bolt bracket 103 assembled with bolts, the top of the bolt bracket 103 is provided with a bolt assembled duct compartment 104, and the side of the duct compartment 104 is provided with a fitted sound insulation board 105.

[0022] In an embodiment of the present invention, when in use, the equipment is placed at the processing site through the base plate 101, and after the bolt bracket 103 is bolted together through the fixed base frame 102, a bolt-mounted duct compartment 104 is provided on the top of the bolt bracket 103 so that a sound insulation board 105 is provided on the outer side of the duct compartment 104 to achieve a silent effect during the processing process.

[0023] One end of the duct compartment 104 is provided with an air intake protective cover 106 which is bolted on, and the other end of the duct compartment 104 is provided with an exhaust protective cover 107 which is bolted on. An axle beam frame 108 is provided on the inner side of the duct compartment 104, and an output shaft 109 is provided on the opposite side of the axle beam frame 108. Turbine blades 1010 are provided on the outer side of the output shaft 109, and the output end of the output shaft 109 passes through the axle beam frame 108 and is connected to a generator set 1011.

[0024] In the embodiment of the present invention, when the high-pressure air mass is formed through the duct chamber 104, the shaft frame 108, the output shaft 109, and the turbine blades 1010 are caused to spirally rotate, allowing the generator set 1011 to achieve the effect of effective power generation.

[0025] The air pressure input assembly 2 includes an end sleeve cover 201, a heat-insulating and pressure-maintaining tube 202, a first connecting tube 203, a pressure inlet valve 204 and a pressure inlet port 205. The end sleeve cover 201 is sleeve-connected to the outer end side of the air intake protective cover 106. A heat-insulating and pressure-maintaining tube 202 is provided on the outer side of the middle part of the end sleeve cover 201, and a first connecting tube 203 is provided at one end of the heat-insulating and pressure-maintaining tube 202. A pressure inlet valve 204 is provided at one end of the first connecting tube 203, and a pressure inlet port 205 is provided at one end of the pressure inlet valve 204.

[0026] In an embodiment of the present invention, when the equipment needs to be operated, the air inlet valve 306 and the air outlet valve 504 are closed, and then the pressure inlet 205 is used to connect to the boiler, and the pressure inlet valve 204 is opened. After opening, the heat-insulating and pressure-maintaining pipe 202, the first connecting pipe 203, and the pressure inlet valve 204 input the high-pressure air mass into the duct compartment 104.

[0027] The preheating assembly 3 includes a first bolt rack 301, a heating tube 302, a flower-shaped block 303, a heating rod 304, a temporary storage compartment 305, an air intake valve 306 and an air intake port 307. The first bolt rack 301 is bolted to the outside of one end of the duct compartment 104, and on the inside of one end of the first bolt rack 301, an annularly distributed flower-shaped block 303 is provided on the inner side of the heating tube 302, and a heating rod 304 is provided on the opposite side of the flower-shaped block 303. A temporary storage compartment 305 is provided at the output end of the heating tube 302, and an air intake valve 306 is provided at one end of the temporary storage compartment 305, and an air intake port 307 is provided at one end of the air intake valve 306.

[0028] In an embodiment of the present invention, when preheating is required, the air intake valve 306 is opened to allow external air to enter the air intake valve 306 through the air inlet 307 and be input into the temporary storage compartment 305 through the output end of the air intake valve 306. The flower-shaped block 303 on the inner side of the heating tube 302 outputs electrical energy to generate heat for the heating rod 304 to achieve the effect of heating the air inside the heating tube 302. After heating, the air is input into the duct compartment 104 at the input end of the air intake protective cover 106 through the output end of the heating tube 302.

[0029] The air pressure discharge component 4 includes an end cover sleeve 401, a branch tube 402, a circular fin 403, a three-way plate 404, an angle tube 405, a second connecting pipe 406, a pressure outlet valve 407 and a pressure outlet port 408. The end cover sleeve 401 is arranged on the outer side of the exhaust protective cover 107. The output end of the end cover sleeve 401 is provided with a branch tube 402 connected in a socket manner, and the outer side of the branch tube 402 is provided with a circular fin 403 installed in a socket manner. The output end of the branch tube 402 is provided with a three-way plate 404.

[0030] In the embodiment of the present invention, the high-temperature and high-pressure air mass is then input into the branching capillary 402 at the output end of the end cover 401 to allow the circular fins 403 to achieve a heat dissipation effect.

[0031] An angle tube 405 is provided on the outer side of the middle part of the three-way plate 404, and a second connecting tube 406 with a sleeve connection is provided at one end of the angle tube 405, a pressure outlet valve 407 is provided at one end of the second connecting tube 406, and a pressure outlet port 408 with a sleeve connection is provided at one end of the pressure outlet valve 407.

[0032] In an embodiment of the present invention, after the temperature drops, the pressure outlet valve 407 is opened to allow the energized air mass to pass through the angle tube 405, the second connecting tube 406, the pressure outlet valve 407 and the pressure outlet 408 output device to achieve the discharge effect.

[0033] The heat exhaust regulating mechanism 5 includes a second bolt frame 501, an air hood 502, an exhaust fan 503, an air outlet valve 504, a third connecting pipe 505, a pressure regulating pipe 506, a cylinder 507, a telescopic rod 508 and a pressure plug 509. The second bolt frame 501 is bolted to the outside of the other end of the duct compartment 104. The air hood 502 is provided on the outside of one end of the second bolt frame 501, and the exhaust fan 503 is provided at one end of the air hood 502. The air outlet valve 504 is provided at the other end of the air hood 502, and the third connecting pipe 505 is provided at one end of the air outlet valve 504.

[0034] In an embodiment of the present invention, the air outlet valve 504 is then started to open, and after opening, the exhaust fan 503 is started to output power to drive the output end to operate, so that the wind force generated by the output power of the exhaust fan 503 is slowly discharged through the wind cover 502, the exhaust fan 503, the air outlet valve 504, the third connecting pipe 505, and the pressure regulating pipe 506 to accelerate the hot air to preheat the axle beam frame 108, the output shaft 109, and the turbine blades 1010.

[0035] A sleeve-mounted pressure regulating tube 506 is provided at one end of the third connecting tube 505 , and a cylinder 507 is provided at the outer end of the pressure regulating tube 506 . A telescopic rod 508 is provided at the output end of the cylinder 507 , and a pressure plug 509 is provided at one end of the telescopic rod 508 .

[0036] In an embodiment of the present invention, when balanced slow heating is required, the cylinder 507 at one end of the pressure regulating tube 506 is started to output power to drive the output end to operate, so that the output power of the cylinder 507 can drive the telescopic rod 508 and the pressure plug 509 to achieve two groups of coordinated reciprocating alternating operation, so that the hot air is discharged slowly, achieving the effect of balanced preheating.

[0037] The working principle of the present invention is as follows: when in use, the equipment is placed at the processing site through the bottom plate 101, and after the bolt bracket 103 is bolted together through the fixed base frame 102, a duct cabin 104 with bolts is set on the top of the bolt bracket 103 so that a sound insulation board 105 is set on the outer side of the duct cabin 104 to achieve a silent effect during the processing. When preheating is required, the air intake valve 306 is opened to allow the outside air to enter the air intake valve 306 through the air inlet 307, and be input into the temporary storage cabin 305 through the output end of the air intake valve 306, and pass through the inner side of the heating pipe 302. The flower block 303 outputs electrical energy to the heating rod 304 to generate heat to achieve the effect of heating the air inside the heating tube 302. After heating, the air is input into the duct cabin 104 at the input end of the air intake protective cover 106 through the output end of the heating tube 302, and then the air outlet valve 504 is started to open. After opening, the exhaust fan 503 is started to output power to drive the output end to run, so that the wind generated by the output power of the exhaust fan 503 is slowly discharged through the wind cover 502, the exhaust fan 503, the air outlet valve 504, the third connecting pipe 505, and the pressure regulating pipe 506 to accelerate the hot air to the shaft beam frame 108 and the output shaft. 109. The turbine blades 1010 are preheated. When balanced slow heating is required, the cylinder 507 at one end of the pressure regulating pipe 506 is started to output power to drive the output end to operate, so that the output power of the cylinder 507 can drive the telescopic rod 508 and the pressure plug 509 to achieve two sets of coordinated reciprocating alternating operation, so that the hot air is discharged slowly to achieve the effect of balanced preheating. When the equipment needs to be operated, the air inlet valve 306 and the air outlet valve 504 are closed, and then the pressure inlet port 205 is used to connect the boiler, and the pressure inlet valve 204 is opened. After opening, the heat preservation and pressure maintaining pipe 202, the first connecting pipe 203, the pressure inlet valve 204 and the pressure inlet valve 204 are opened. Valve 204 inputs the high-pressure air mass into the duct compartment 104. When the high-pressure air mass is formed through the duct compartment 104 and runs, the axle beam frame 108, the output shaft 109, and the turbine blades 1010 are spirally rotated to allow the generator set 1011 to achieve the effect of effective power generation. Then, the high-temperature and high-pressure air mass is input into the directional capillary 402 at the output end of the end cover sleeve 401 to achieve the effect of heat dissipation of the circular fins 403. After cooling, the pressure outlet valve 407 is opened to allow the energized air mass to pass through the angle pipe 405, the second connecting pipe 406, the pressure outlet valve 407 and the pressure outlet 408 output device to achieve the discharge effect.

[0038] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0039] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A preheating mechanism for a steam turbine in a thermal power plant, comprising a turbine operating mechanism (1) and a heat exhaust regulating mechanism (5), characterized in that: A sleeve-mounted air pressure input assembly (2) is provided on one group of outer sides of the turbine operating mechanism (1), a sleeve-mounted preheating assembly (3) is provided on both sides of one end of the turbine operating mechanism (1), a sleeve-mounted air pressure discharge assembly (4) is provided on another group of outer sides of the turbine operating mechanism (1), and a heat exhaust regulating mechanism (5) is provided on both sides of the other end of the turbine operating mechanism (1) and a sleeve-mounted air pressure discharge assembly (4).

2. A preheating mechanism for a steam turbine in a thermal power plant according to claim 1, characterized in that: The turbine operating mechanism (1) comprises a base plate (101), a fixed base frame (102), a bolt bracket (103), a duct chamber (104), a sound insulation board (105), an air intake protective cover (106), an exhaust protective cover (107), an axle beam frame (108), an output shaft (109), a turbine blade (1010) and a generator set (1011), wherein the top of the base plate (101) is provided with a fixed base frame (102), and the top of the fixed base frame (102) is provided with a bolt bracket (103) assembled with bolts, and the top of the bolt bracket (103) is provided with a duct chamber (104) assembled with bolts, and the side of the duct chamber (104) is provided with a fitted sound insulation board (105).

3. A preheating mechanism for a steam turbine in a thermal power plant according to claim 2, characterized in that: One end of the duct chamber (104) is provided with an air intake protective cover (106) which is bolted together, and the other end of the duct chamber (104) is provided with an exhaust protective cover (107) which is bolted together. An axle beam frame (108) is provided on the inner side of the duct chamber (104), and an output shaft (109) is provided on the opposite side of the axle beam frame (108). Turbine blades (1010) are provided on the outer side of the output shaft (109), and the output end of the output shaft (109) passes through the axle beam frame (108) and is connected to a generator set (1011).

4. The preheating mechanism for a steam turbine in a thermal power plant according to claim 2, characterized in that: The air pressure input assembly (2) comprises an end sleeve cover (201), a heat-insulating and pressure-maintaining pipe (202), a first connecting pipe (203), a pressure inlet valve (204) and a pressure inlet port (205); the end sleeve cover (201) is sleeve-connected to the outer end side of the air inlet protective cover (106); a heat-insulating and pressure-maintaining pipe (202) is provided on the outer side of the middle portion of the end sleeve cover (201); one end of the heat-insulating and pressure-maintaining pipe (202) is provided with a first connecting pipe (203); one end of the first connecting pipe (203) is provided with a pressure inlet valve (204); and one end of the pressure inlet valve (204) is provided with a sleeve-connected pressure inlet port (205).

5. The preheating mechanism for a steam turbine in a thermal power plant according to claim 2, characterized in that: The preheating assembly (3) comprises a first bolt rack (301), a heating pipe (302), a flower-shaped block (303), a heating rod (304), a temporary storage chamber (305), an air intake valve (306) and an air intake port (307). The first bolt rack (301) is bolted to the outside of one end of the duct chamber (104). On the inside of one end of the first bolt rack (301), an annularly distributed flower-shaped block (303) is provided on the inner side of the heating pipe (302), and a heating rod (304) is provided on the opposite side of the flower-shaped block (303). A temporary storage chamber (305) is provided at the output end of the heating pipe (302), and a sleeve-connected air intake valve (306) is provided at one end of the temporary storage chamber (305). An air intake port (307) is provided at one end of the air intake valve (306).

6. The preheating mechanism for a steam turbine in a thermal power plant according to claim 2, characterized in that: The air pressure discharge assembly (4) comprises an end cover sleeve (401), a branching capillary tube (402), a circular fin (403), a three-way plate (404), an angle tube (405), a second connecting tube (406), a pressure outlet valve (407) and a pressure outlet port (408). The end cover sleeve (401) is arranged on the outer side of the exhaust protective cover (107). The output end of the end cover sleeve (401) is provided with a branching capillary tube (402) connected in a sleeve manner, and the outer side of the branching capillary tube (402) is provided with a circular fin (403) installed in a sleeve manner. The output end of the branching capillary tube (402) is provided with a three-way plate (404).

7. The preheating mechanism for a steam turbine in a thermal power plant according to claim 6, characterized in that: An angle tube (405) is provided on the outer side of the middle portion of the three-way plate (404), and a second connecting tube (406) is provided at one end of the angle tube (405) for sleeve connection. A pressure outlet valve (407) is provided at one end of the second connecting tube (406), and a pressure outlet port (408) is provided at one end of the pressure outlet valve (407).

8. The preheating mechanism for a steam turbine in a thermal power plant according to claim 2, characterized in that: The heat exhaust regulating mechanism (5) comprises a second bolt frame (501), an air cover (502), an exhaust fan (503), an air outlet valve (504), a third connecting pipe (505), a pressure regulating pipe (506), a cylinder (507), a telescopic rod (508) and a pressure plug (509), wherein the second bolt frame (501) is bolted to the outside of the other end of the duct chamber (104), an air cover (502) is provided on the outside of one end of the second bolt frame (501), and an exhaust fan (503) is provided at one end of the air cover (502), an air outlet valve (504) is provided at the other end of the air cover (502), and a third connecting pipe (505) is provided at one end of the air outlet valve (504) which is sleeve-mounted.

9. The preheating mechanism for a steam turbine in a thermal power plant according to claim 8, characterized in that: One end of the third connecting pipe (505) is provided with a sleeve-mounted pressure regulating pipe (506), and the outer end of the pressure regulating pipe (506) is provided with a cylinder (507), the output end of the cylinder (507) is provided with a telescopic rod (508), and one end of the telescopic rod (508) is provided with a press plug (509).

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