Supercritical heat supply steam turbine

Abstract

The invention provides a supercritical heat supply steam turbine, and relates to the technical field of thermal power generation. The supercritical heat supply steam turbine comprises a high-pressure cylinder, an intermediate-pressure cylinder and a coupler. The high-pressure cylinder comprises a high-pressure cylinder body, a high-pressure main shaft, a high-pressure cylinder through-flow stage, a plurality of high-pressure steam inlet pipes and a plurality of high-pressure nozzles; the high-pressure cylinder through-flow stage is arranged in a first cavity, main steam enters the first cavity after passing through a high-pressure steam inlet pipe, a first steam channel and a high-pressure nozzle to drive the high-pressure cylinder through-flow stage to do work, heat energy is converted into mechanical energy, and the mechanical energy is transmitted through a high-pressure main shaft; the intermediate-pressure cylinder is provided with a second cavity and comprises an intermediate-pressure main shaft and an intermediate-pressure cylinder through-flow stage, the intermediate-pressure cylinder through-flow stage can be driven to do work by conveying reheated steam to the second cavity, heat energy is converted into mechanical energy, and the mechanical energy is transmitted through the intermediate-pressure main shaft; the medium-pressure spindle and the high-pressure spindle are connected through a coupler. The steam turbine solves the problem that in the prior art, a supercritical heat supply steam turbine is low in through-flow efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of thermal power generation, and in particular to a supercritical heating steam turbine. Background Art

[0002] The supercritical 350MW unit is independently optimized based on the 600MW supercritical unit. Although the parameters are relatively advanced in the 300MW steam turbine and belong to the early flow technology unit, it is limited by the design concept and manufacturing level at that time. There is a large deviation between the operating heat consumption and the design heat consumption. There is a two-generation gap with the latest flow technology. The unit efficiency is relatively backward, and the indicators of the operating unit are far from meeting the requirements of energy conservation and emission reduction. At the same time, for heating units, with the growth of the heating market, the original heating design capacity cannot meet the demand for heating growth. At the same time, the 350MW supercritical steam turbine also has the problem of low flow efficiency and inability to meet the flexible heating of power plants.

[0003] Therefore, a device is urgently needed to solve at least one of the above problems. Summary of the invention

[0004] The purpose of the embodiment of the present invention is to provide a supercritical heating steam turbine to solve the problem of low flow efficiency of supercritical heating steam turbines in the prior art.

[0005] In order to achieve the above object, the present invention provides a supercritical heating steam turbine, the supercritical heating steam turbine comprising: a high-pressure cylinder, an intermediate-pressure cylinder and a coupling; The high-pressure cylinder comprises a high-pressure cylinder body, a high-pressure main shaft, a high-pressure cylinder flow stage, a plurality of high-pressure steam inlet pipes and a plurality of high-pressure nozzles; The high-pressure cylinder body has a first chamber, the high-pressure main shaft is arranged in the first chamber and passes through the first chamber to be connected with the medium-pressure main shaft; a plurality of first through holes and a plurality of first steam channels are provided on the high-pressure cylinder body, one end of the first steam channel is provided with a high-pressure nozzle chamber as a gas outlet, a high-pressure nozzle is provided in each high-pressure nozzle chamber, and a high-pressure steam inlet pipe extends into the high-pressure cylinder body through a corresponding first through hole and is connected with the other end of the corresponding first steam channel; The high-pressure cylinder flow stage is arranged in the first chamber, connected with the high-pressure main shaft and the high-pressure cylinder body. The main steam is ejected through the high-pressure steam inlet pipe, the first steam channel and the high-pressure nozzle into the first chamber to drive the high-pressure cylinder flow stage to do work, converting thermal energy into mechanical energy, which is transmitted through the high-pressure main shaft; The intermediate-pressure cylinder includes a second chamber, an intermediate-pressure main shaft and an intermediate-pressure cylinder flow stage which are arranged in the second chamber and are connected to each other. By delivering reheated steam to the second chamber, the intermediate-pressure cylinder flow stage can be driven to do work to convert thermal energy into mechanical energy, and the mechanical energy is transmitted through the intermediate-pressure main shaft; wherein the intermediate-pressure main shaft and the high-pressure main shaft are connected by a coupling.

[0006] Specifically, the high-pressure cylinder includes: a high-pressure inner cylinder and a high-pressure outer cylinder; The chamber of the high-pressure inner cylinder body is used as the first chamber, the high-pressure outer cylinder body is arranged to cover the high-pressure inner cylinder body, and the high-pressure main shaft is arranged in the first chamber and passes through the first chamber to be connected with the medium-pressure main shaft; A plurality of first through holes are formed on the high-pressure outer cylinder body, a plurality of first steam channels are formed on the high-pressure inner cylinder body, and a high-pressure steam inlet pipe extends into the high-pressure outer cylinder body through corresponding first through holes and is connected with corresponding first steam channels.

[0007] Specifically, the high-pressure cylinder further includes: a high-pressure front shaft seal and a high-pressure rear shaft seal; The high-pressure front shaft seal and the high-pressure rear shaft seal are respectively arranged at both ends of the high-pressure main shaft and are located between the high-pressure main shaft and the high-pressure outer cylinder body to seal the gap between the high-pressure main shaft and the high-pressure outer cylinder body.

[0008] Specifically, the high-pressure cylinder flow stage includes: a first flow stage and a second flow stage; the first flow stage is arranged at the steam outlet of the high-pressure nozzle, and the main steam enters the first chamber after being ejected through the high-pressure steam inlet pipe, the first steam channel and the high-pressure nozzle, and drives the first flow stage and the second flow stage to do work in turn, converting thermal energy into mechanical energy, and the mechanical energy is transmitted through the high-pressure main shaft.

[0009] Specifically, the first flow-through stage includes high-pressure regulating blades arranged on the high-pressure main shaft.

[0010] Specifically, the second flow stage includes a plurality of high-pressure flow vanes and a plurality of high-pressure flow stator vanes. The plurality of high-pressure flow vanes are arranged in parallel with each other in the first chamber at a first given interval and are connected to the high-pressure main shaft. A high-pressure flow stator vane connected to the high-pressure inner cylinder is arranged between two adjacent high-pressure flow vanes, so that the plurality of high-pressure flow vanes and the plurality of high-pressure flow stator vanes are staggered with each other.

[0011] Specifically, a connecting flange is provided at one end of each high-pressure steam inlet pipe connected to the corresponding first steam channel, and the high-pressure steam inlet pipe is screwed to the corresponding first steam channel through the connecting flange.

[0012] Specifically, the medium-pressure cylinder further comprises: a medium-pressure outer cylinder body and a medium-pressure inner cylinder body; The chamber of the medium-pressure inner cylinder body serves as the second chamber, the medium-pressure outer cylinder body covers the medium-pressure inner cylinder body, and the medium-pressure main shaft is arranged in the second chamber and passes through the second chamber to be connected with the high-pressure main shaft.

[0013] Specifically, the intermediate pressure cylinder further includes: an intermediate pressure steam inlet pipe; An intermediate-pressure through hole is provided on the intermediate-pressure outer cylinder body, and a second steam channel is provided on the intermediate-pressure inner cylinder body. One end of the intermediate-pressure steam inlet pipe passes through the intermediate-pressure through hole and enters the intermediate-pressure outer cylinder body and is connected to the second steam channel. The reheated steam enters the second chamber after passing through the intermediate-pressure steam inlet pipe and the second steam channel to drive the intermediate-pressure cylinder flow stage to do work, thereby converting thermal energy into mechanical energy.

[0014] Specifically, the intermediate pressure cylinder flow stage includes: a first blade cascade flow stage and a second blade cascade flow stage; The No. 1 blade cascade flow stage and the No. 2 blade cascade flow stage are both arranged between the intermediate pressure main shaft and the intermediate pressure inner cylinder body, wherein the No. 1 blade cascade flow stage is arranged at one end of the steam outlet of the second steam channel, and the reheated steam enters the second chamber after passing through the intermediate pressure steam inlet pipe and the second steam channel, and drives the No. 1 blade cascade flow stage and the No. 2 blade cascade flow stage to do work in turn.

[0015] Specifically, the No. 1 blade grid flow stage includes a plurality of No. 1 moving blades and a plurality of No. 1 stationary blades. The plurality of No. 1 moving blades are arranged in parallel with each other in the second chamber at a second given interval and are connected to the medium-pressure main shaft. A No. 1 stationary blade connected to the medium-pressure inner cylinder body is arranged between two adjacent No. 1 moving blades. The plurality of No. 1 moving blades and the plurality of No. 1 stationary blades are arranged alternately.

[0016] Specifically, the No. 2 blade grid flow stage includes a plurality of No. 2 moving blades and a plurality of No. 2 stationary blades. The plurality of No. 2 moving blades are arranged in parallel with each other in the second chamber at a third given interval and are connected to the medium-pressure main shaft. A No. 2 stationary blade connected to the medium-pressure inner cylinder body is arranged between two adjacent No. 2 moving blades, so that the plurality of No. 2 moving blades and the plurality of No. 2 stationary blades are staggered with each other.

[0017] Specifically, the medium-pressure cylinder further includes: a rotating partition, which is arranged in the second chamber and sleeved on the medium-pressure main shaft, and is located between the first blade cascade flow stage and the second blade cascade flow stage to divide the second chamber into two sub-chambers.

[0018] Specifically, the medium-pressure cylinder further includes: a medium-pressure front shaft seal and a medium-pressure rear shaft seal; The medium-pressure front shaft seal and the medium-pressure rear shaft seal are respectively arranged at both ends of the medium-pressure main shaft and are located between the medium-pressure main shaft and the medium-pressure outer cylinder body to seal the gap between the medium-pressure main shaft and the medium-pressure outer cylinder body.

[0019] The supercritical heating steam turbine provided by the present invention has main steam ejected through a high-pressure steam inlet pipe, a first steam channel and a high-pressure nozzle and then enters a first chamber to drive the high-pressure cylinder flow stage to perform work, so as to convert the thermal energy of the main steam into mechanical energy; the reheated steam enters a second chamber of the medium-pressure cylinder to drive the medium-pressure cylinder flow stage to perform work, so as to convert the thermal energy of the reheated steam into mechanical energy; the high-pressure main shaft of the high-pressure cylinder and the medium-pressure main shaft of the medium-pressure cylinder are connected through a coupling; the mechanical energy is finally transmitted through the high-pressure main shaft and the medium-pressure main shaft; a high-pressure nozzle chamber is opened at one end of the first steam channel, so as to reduce the steam leakage points, greatly reduce the steam leakage, optimize the steam inlet flow channel, reduce the steam pressure loss, and solve the problem of low flow efficiency of the supercritical heating steam turbine in the prior art.

[0020] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings: Figure 1 It is a structural schematic diagram of a medium and high pressure cylinder of a supercritical heating steam turbine provided by an embodiment of the present invention; Figure 2 It is a schematic diagram of the structure of the intermediate pressure cylinder in the supercritical heating steam turbine provided by an embodiment of the present invention; Figure 3 It is a schematic diagram of the assembly of a high-pressure steam inlet pipe of a supercritical heating steam turbine provided by an embodiment of the present invention; Figure 4 is a schematic diagram of the arrangement of the first steam channel in the supercritical heating steam turbine provided in an embodiment of the present invention; Figure 5 It is a schematic diagram of a rotating baffle in a supercritical heating steam turbine provided in an embodiment of the present invention.

[0022] Description of Reference Numerals 1-high-pressure cylinder; 2-medium-pressure cylinder; 11-high-pressure inner cylinder body; 12-high-pressure outer cylinder body; 13-high-pressure main shaft; 14-high-pressure steam inlet pipe; 15-high-pressure nozzle; 16-first flow stage; 17-second flow stage; 18-high-pressure front shaft seal; 19-high-pressure rear shaft seal; 121-first steam channel; 171-high-pressure flow vanes; 172-high-pressure flow stationary vanes; 21-medium-pressure main shaft; 22-medium-pressure outer cylinder body; 23-medium-pressure inner cylinder body; 24-No. 1 blade grid flow stage; 25-No. 2 blade grid flow stage; 26-rotating partition; 27-medium-pressure front shaft seal; 28-medium-pressure rear shaft seal; 29-medium-pressure steam inlet pipe; 241-No. 1 moving blade; 242-No. 1 stationary blade; 251-No. 2 moving blade; 252-No. 2 stationary blade. DETAILED DESCRIPTION

[0023] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0024] Figure 1 It is a structural schematic diagram of the high-pressure cylinder of a supercritical heating steam turbine; Figure 2 It is a schematic diagram of the structure of the intermediate pressure cylinder in a supercritical heating steam turbine; Figure 3 It is a schematic diagram of the assembly of the high-pressure steam inlet pipe of a supercritical heating steam turbine; Figure 4 is a schematic diagram of the arrangement of the first steam channel in a supercritical heating steam turbine; Figure 5 Schematic diagram of a rotating diaphragm in a supercritical heating steam turbine.

[0025] like Figure 1-Figure 5 As shown, the present invention provides a supercritical heating steam turbine, which comprises: a high-pressure cylinder 1, a medium-pressure cylinder 2 and a coupling; The high-pressure cylinder 1 comprises a high-pressure cylinder body, a high-pressure main shaft 13, a high-pressure cylinder flow stage, a plurality of high-pressure steam inlet pipes 14 and a plurality of high-pressure nozzles 15; The high-pressure cylinder has a first chamber, and the high-pressure main shaft 13 is arranged in the first chamber and passes through the first chamber to be connected with the medium-pressure main shaft 21; a plurality of first through holes and a plurality of first steam channels 121 are provided on the high-pressure cylinder, and a high-pressure nozzle chamber is provided at one end of the first steam channel 121 as a gas outlet, and a high-pressure nozzle 15 is provided in each high-pressure nozzle chamber, and a high-pressure steam inlet pipe 14 extends into the high-pressure cylinder through the corresponding first through hole and is connected with the other end of the corresponding first steam channel 121; The high-pressure cylinder flow stage is arranged in the first chamber, connected to the high-pressure main shaft 13 and the high-pressure cylinder body. The main steam is ejected through the high-pressure steam inlet pipe 14, the first steam channel 121 and the high-pressure nozzle 15 and enters the first chamber to drive the high-pressure cylinder flow stage to do work, converting heat energy into mechanical energy, which is transmitted through the high-pressure main shaft 13; The intermediate-pressure cylinder 2 has a second chamber, including an intermediate-pressure main shaft 21 and an intermediate-pressure cylinder flow stage which are arranged in the second chamber and are interconnected. By delivering reheated steam to the second chamber, the intermediate-pressure cylinder flow stage can be driven to do work to convert thermal energy into mechanical energy, and the mechanical energy is transmitted through the intermediate-pressure main shaft 21; wherein the intermediate-pressure main shaft 21 and the high-pressure main shaft 13 are connected by a coupling.

[0026] The supercritical heating steam turbine provided by the present invention has a high-pressure main shaft 13 that can pass through the first chamber of the high-pressure cylinder body and both ends of the high-pressure main shaft 13 are exposed outside the high-pressure cylinder body, a high-pressure cylinder flow stage is arranged in the first chamber, and the high-pressure cylinder flow stage is also connected to the high-pressure main shaft 13 and the high-pressure cylinder body, a plurality of first through holes and a plurality of first steam channels 121 provided on the high-pressure cylinder body correspond one to one, one end of the high-pressure steam inlet pipe 14 passes through the corresponding first through hole on the high-pressure cylinder body and is connected to the other end of the corresponding first steam channel 121, the air outlet end of the first steam channel 121 is arranged toward the first chamber, a high-pressure nozzle chamber is provided at the air outlet end, the first steam channel 121 and the nozzle chamber are an integrally formed structure, there is no independent steam seal body, thereby reducing leakage points, a high-pressure nozzle 15 is arranged in the high-pressure nozzle chamber, and main steam is ejected through the high-pressure steam inlet pipe 14, the corresponding first steam channel 121 and the corresponding high-pressure nozzle 15 After entering the first chamber, the main steam drives the high-pressure cylinder flow stage arranged in the first chamber to do work to convert the thermal energy of the main steam into mechanical energy, and transmits the mechanical energy through the high-pressure main shaft 13 connected to the high-pressure cylinder flow stage. The external fixed flange of the medium-pressure cylinder 2 adopts a narrow high flange. The clamping surface of the narrow high flange is narrower, and the clamping force required for sealing is smaller than that of the wide-face flange. The narrow high flange is beneficial to reducing the weight of the flange while enhancing the flexibility of the flange support arm; the reheated steam enters the second chamber of the medium-pressure cylinder 2, and the reheated steam drives the medium-pressure cylinder flow stage arranged in the second chamber to do work to convert the thermal energy of the reheated steam into mechanical energy, and transmits the mechanical energy through the medium-pressure main shaft 21. The high-pressure main shaft 13 and the medium-pressure main shaft 21 are connected by a coupling, so that the thermal energy of the main steam and the reheated steam is converted into mechanical energy and then transmitted through the high-pressure main shaft and the medium-pressure main shaft, thereby solving the problem of low flow efficiency of the supercritical heating steam turbine in the prior art.

[0027] In one embodiment, Figure 1 As shown, the high-pressure cylinder comprises: a high-pressure inner cylinder 11 and a high-pressure outer cylinder 12; The chamber of the high-pressure inner cylinder 11 is used as the first chamber, the high-pressure outer cylinder 12 is arranged to cover the high-pressure inner cylinder 11, and the high-pressure main shaft 13 is arranged in the first chamber and passes through the first chamber to be connected with the medium-pressure main shaft 21; A plurality of first through holes are formed on the high-pressure outer cylinder 12 , a plurality of first steam channels 121 are formed on the high-pressure inner cylinder 11 , and the high-pressure steam inlet pipe 14 extends into the high-pressure outer cylinder 12 through the corresponding first through holes and is connected to the corresponding first steam channels 121 .

[0028] The high-pressure cylinder 1 also includes: a high-pressure front shaft seal 18 and a high-pressure rear shaft seal 19; The high-pressure front shaft seal 18 and the high-pressure rear shaft seal 19 are respectively arranged at both ends of the high-pressure main shaft 13 and located between the high-pressure main shaft 13 and the high-pressure outer cylinder body 12 to seal the gap between the high-pressure main shaft 13 and the high-pressure outer cylinder body 12.

[0029] The high-pressure cylinder flow stage includes: a first flow stage 16 and a second flow stage 17; the first flow stage 16 is arranged at the steam outlet of the high-pressure nozzle 15, and the main steam enters the first chamber after being ejected through the high-pressure steam inlet pipe 14, the first steam channel 121 and the high-pressure nozzle 15, and sequentially drives the first flow stage 16 and the second flow stage 17 to do work to convert thermal energy into mechanical energy, and the mechanical energy is transmitted through the high-pressure main shaft 13.

[0030] The first flow stage 16 includes a high-pressure regulating moving blade 161 arranged on the high-pressure main shaft 13 .

[0031] The second flow stage 17 includes a plurality of high-pressure flow vanes 171 and a plurality of high-pressure flow stator vanes 172. The plurality of high-pressure flow vanes 171 are arranged in parallel with each other in the first chamber at a first given interval and are connected to the high-pressure main shaft 13. A high-pressure flow stator vane 172 connected to the high-pressure inner cylinder body 11 is arranged between two adjacent high-pressure flow vanes 171, so that the plurality of high-pressure flow vanes 171 and the plurality of high-pressure flow stator vanes 172 are staggered with each other.

[0032] A connecting flange is provided at one end of each high-pressure steam inlet pipe 14 connected to the corresponding first steam channel 121 , and the high-pressure steam inlet pipe 14 is screwed to the corresponding first steam channel 121 via the connecting flange.

[0033] The high-pressure cylinder 1 adopts a double-layer cylinder structure, and the high-pressure nozzle chamber is arranged at the outlet end of the first steam channel of the high-pressure inner cylinder body 11, so that the high-pressure nozzle chamber and the high-pressure inner cylinder body are integrated, the steam leakage points are reduced, the steam leakage is greatly reduced, the steam inlet flow channel is optimized, the steam pressure loss is reduced, the main steam entering the first chamber is uniform, and the overall efficiency of the high-pressure cylinder flow stage of the first chamber is effectively improved.

[0034] The first through hole is opened on the high-pressure outer cylinder body 12, and the first steam channel 121 is opened on the high-pressure inner cylinder body 11. Each first steam channel 121 is connected to the first chamber. The high-pressure steam inlet pipe 14 and the high-pressure outer cylinder body 12 are connected by a cannula, that is, one end of the high-pressure steam inlet pipe 14 passes through the corresponding first through hole, and a cannula disc is arranged between the high-pressure steam inlet pipe 14 and the first through hole to seal the gap between the first through hole and the high-pressure steam inlet pipe 14. After passing through the first through hole, the high-pressure steam inlet pipe 14 is connected to the corresponding first steam channel 121, and the main steam enters the first chamber after passing through the high-pressure steam inlet pipe 14 and the corresponding first steam channel 121.

[0035] The chamber of the high-pressure inner cylinder 11 of the high-pressure cylinder body serves as the first chamber, and the high-pressure outer cylinder 12 has a high-pressure chamber. The high-pressure outer cylinder 12 covers the high-pressure inner cylinder 11 so that the high-pressure inner cylinder 11 is located in the high-pressure chamber of the high-pressure outer cylinder 12. The high-pressure main shaft 13 passes through the high-pressure chamber and the first chamber, and both ends are exposed outside the high-pressure chamber. One end of the high-pressure main shaft 13 is connected to the medium-pressure main shaft 21 through a coupling. The high-pressure regulating moving vanes 161, the high-pressure flow vanes 171 and the high-pressure flow stationary vanes 172 are all arranged in the first chamber. The high-pressure regulating moving vanes 161 are arranged on the high-pressure main shaft 13 and are located at the steam outlet of the high-pressure nozzle 15. The high-pressure flow vanes 171 are arranged on the high-pressure main shaft 13 according to the first given spacing, and there is a between two adjacent high-pressure flow vanes 171. A high-pressure flow stator 172 connected to the high-pressure inner cylinder 11 makes the high-pressure flow vanes 171 and the high-pressure flow stator 172 alternately arranged. Changing the blade angle and position of the high-pressure regulating moving blades 161 can adapt to different working conditions of the steam turbine. The blade angle and position of the high-pressure flow vanes 171 cannot be changed. The main steam is ejected through the high-pressure steam inlet pipe 14, the first steam channel 121 and the high-pressure nozzle 15 arranged on the first steam channel 121 and then enters the first chamber evenly. The main steam drives the high-pressure regulating moving blades 161 and multiple high-pressure flow vanes 171 mounted on the high-pressure main shaft 13 to rotate, converts the thermal energy of the main steam into mechanical energy and transmits it through the high-pressure main shaft 13. The second flow stage 17 is stage 11, which belongs to the high-efficiency impulse type moving and stationary blade profile.

[0036] In order to improve the working efficiency of the high-pressure cylinder 1, a high-pressure front shaft seal 18 and a high-pressure rear shaft seal 19 are arranged between the high-pressure outer cylinder body 12 and the high-pressure main shaft 13. The high-pressure front shaft seal 18 and the high-pressure rear shaft seal 19 adopt staggered tooth steam seals. The high-pressure rear shaft seal 19 is arranged at one end where the high-pressure main shaft 13 is connected to the medium-pressure main shaft 21. The high-pressure front shaft seal 18 and the high-pressure rear shaft seal 19 are used to seal the gap between the high-pressure outer cylinder body 12 and the high-pressure main shaft 13 to avoid steam leakage from the high-pressure outer cylinder body 12 and affecting the working efficiency of the high-pressure cylinder 1. At the same time, a first intermediate sealing assembly is also arranged between the high-pressure main shaft 13 and the high-pressure inner cylinder body 11 to seal the gap between the high-pressure main shaft 13 and the high-pressure inner cylinder body 11 to avoid the main steam entering the first chamber from the gap between the high-pressure inner cylinder body 11 and the high-pressure main shaft 13.

[0037] like Figure 1 As shown, a through hole is provided on the connecting flange of the high-pressure steam inlet pipe 14, and a screw hole is provided at the connecting end of the first steam channel 121. The screw passes through the through hole and is screwed into the screw hole, thereby fixing the high-pressure steam inlet pipe 14 to the connecting end of the first steam channel 121, so that the connection between the high-pressure steam inlet pipe 14 and the high-pressure inner cylinder body 11 is more reliable, and the main steam can stably enter the first steam channel 121 through the high-pressure steam inlet pipe 14, and auxiliary seals such as spiral wound gaskets are designed between the high-pressure steam inlet pipe 14 and the high-pressure inner cylinder body 11.

[0038] In one embodiment, Figure 2 As shown, the medium-pressure cylinder 2 further includes: a medium-pressure outer cylinder body 22 and a medium-pressure inner cylinder body 23; The chamber of the medium-pressure inner cylinder 23 serves as the second chamber. The medium-pressure outer cylinder 22 covers the medium-pressure inner cylinder 23 . The medium-pressure main shaft 21 is disposed in the second chamber and passes through the second chamber to be connected with the high-pressure main shaft 13 .

[0039] The intermediate pressure cylinder 2 further comprises: an intermediate pressure steam inlet pipe 29; A medium-pressure through hole is provided on the medium-pressure outer cylinder body 22, and a second steam channel is provided on the medium-pressure inner cylinder body 23. One end of the medium-pressure steam inlet pipe 29 passes through the medium-pressure through hole and enters the medium-pressure outer cylinder body 22 to be connected with the second steam channel. The reheated steam enters the second chamber after passing through the medium-pressure steam inlet pipe and the second steam channel to drive the medium-pressure cylinder flow stage to do work, thereby converting thermal energy into mechanical energy.

[0040] The intermediate pressure cylinder flow stages include: a first blade cascade flow stage 24 and a second blade cascade flow stage 25; The No. 1 blade cascade flow stage 24 and the No. 2 blade cascade flow stage 25 are both arranged between the medium-pressure main shaft 21 and the medium-pressure inner cylinder body 23, wherein the No. 1 blade cascade flow stage 24 is arranged at one end of the steam outlet of the second steam channel, and the reheated steam enters the second chamber after passing through the medium-pressure steam inlet pipe and the second steam channel to sequentially drive the No. 1 blade cascade flow stage 24 and the No. 2 blade cascade flow stage 25 to do work.

[0041] The No. 1 blade grid flow stage 24 includes a plurality of No. 1 moving blades 241 and a plurality of No. 1 stationary blades 242. The plurality of No. 1 moving blades 241 are arranged in parallel with each other in the second chamber at a second given interval and are connected to the medium-pressure main shaft 21. A No. 1 stationary blade 242 connected to the medium-pressure inner cylinder body 23 is arranged between two adjacent No. 1 moving blades 241, so that the plurality of No. 1 moving blades 241 and the plurality of No. 1 stationary blades 242 are staggered with each other.

[0042] The No. 2 blade grid flow stage 25 includes a plurality of No. 2 moving blades 251 and a plurality of No. 2 stationary blades 252, wherein the plurality of No. 2 moving blades 251 are arranged in parallel with each other in the second chamber according to a third given spacing and are connected to the medium-pressure main shaft 21, and a No. 2 stationary blade 252 connected to the medium-pressure inner cylinder body 23 is arranged between two adjacent No. 2 moving blades 251, so that the plurality of No. 2 moving blades 251 and the plurality of No. 2 stationary blades 252 are staggered with each other.

[0043] The medium-pressure cylinder 2 further includes a rotating partition 26, which is arranged in the second chamber and sleeved on the medium-pressure main shaft 21, and is located between the first blade cascade flow stage 24 and the second blade cascade flow stage 25 to divide the second chamber into two sub-chambers.

[0044] The medium pressure cylinder 2 also includes: a medium pressure front shaft seal 27 and a medium pressure rear shaft seal 28; The intermediate pressure front shaft seal 27 and the intermediate pressure rear shaft seal 28 are respectively arranged at both ends of the intermediate pressure main shaft 21 and located between the intermediate pressure main shaft 21 and the intermediate pressure outer cylinder body 22 to seal the gap between the intermediate pressure main shaft 21 and the intermediate pressure outer cylinder body 22.

[0045] The chamber of the medium-pressure inner cylinder body 23 of the medium-pressure cylinder 2 serves as the second chamber of the medium-pressure cylinder 2. The medium-pressure outer cylinder body 22 has a medium-pressure chamber. The medium-pressure outer cylinder body 22 covers the medium-pressure inner cylinder body 23 so that the medium-pressure inner cylinder body 23 is located in the medium-pressure chamber. The medium-pressure main shaft 21 passes through the medium-pressure chamber and the second chamber, and the two ends are exposed outside the medium-pressure chamber, and one end is connected to the high-pressure main shaft 13 through a coupling. The medium-pressure inner cylinder body 23 has a front half and a rear half. The first blade The blade-passing stage 24 is arranged at the front half of the medium-pressure inner cylinder 23 in the second chamber, and the second blade-passing stage 25 is arranged at the rear half of the medium-pressure inner cylinder 23. The first blade-passing stage 24 is 5-stage, and the second blade-passing stage 25 is 4-stage. Both of them belong to the high-efficiency impulse moving and stationary blade profile. The plurality of first moving blades 241 of the first blade-passing stage 24 are arranged on the medium-pressure main shaft 21 according to the second given spacing and in parallel with each other. The adjacent two first moving blades 241 are arranged on the medium-pressure main shaft 21 according to the second given spacing and in parallel with each other. A No. 1 stationary blade 242 is arranged between the blades 241, and each No. 1 stationary blade 242 is connected to the medium-pressure inner cylinder body 23. A plurality of No. 2 moving blades 251 of the No. 2 blade cascade flow stage 25 are arranged on the medium-pressure main shaft 21 according to a third given spacing and in parallel with each other. A No. 2 stationary blade 252 connected to the medium-pressure inner cylinder body 23 is arranged between two adjacent No. 2 moving blades 251. One end of the medium-pressure steam inlet pipe 29 passes through the medium-pressure through hole on the medium-pressure outer cylinder body 22 and extends into the medium-pressure chamber to be connected with the second steam channel opened on the medium-pressure inner cylinder body 23. The reheated steam enters the second chamber after passing through the medium-pressure steam inlet pipe 29 and the second steam channel. The reheated steam flows through the No. 1 blade cascade flow stage 24 and the No. 2 blade cascade flow stage 25 in sequence. The reheated steam drives the No. 1 moving blade 241 and the No. 2 moving blade 251 of the No. 1 blade cascade flow stage 24 to rotate so as to convert the thermal energy of the reheated steam into mechanical energy and then transmit it through the medium-pressure main shaft 21.

[0046] A rotating partition 26 is arranged between the No. 1 blade cascade flow stage 24 and the No. 2 blade cascade flow stage 25 to divide the second chamber into two sub-chambers. The No. 1 blade cascade flow stage 24 and the No. 2 blade cascade flow stage 25 are arranged in one sub-chamber respectively. A plurality of medium-pressure nozzle chambers are opened on the rotating partition 26. A medium-pressure nozzle is arranged in each medium-pressure nozzle chamber. After the reheated steam drives the No. 1 blade cascade flow stage 24 to do work, it is ejected through the medium-pressure nozzle on the rotating partition 26 and enters another sub-chamber to drive the No. 2 blade cascade flow stage 25 to do work. In order to ensure the strength of the rotating partition 26, the thickness of the rotating partition 26 is 3 times the thickness of the No. 2 moving blade, ensuring The rotating baffle 26 still has a large strength margin within the working pressure range it can withstand. The pressure difference before and after the rotating baffle 26 increases, resulting in a corresponding increase in the friction of the rotating ring of the accessories of the rotating baffle 26. During construction design, it is necessary to verify whether the output of the oil motor is sufficient, and calculate the strength of components such as the spline shaft and the rotating baffle connecting rod to ensure that the working stress does not exceed the allowable stress of the material at the corresponding temperature to ensure the reliability of the rotating baffle 26. After the rotating baffle 26 is thickened, the maximum steam extraction capacity of the rotating baffle 26 is increased to 400t / h, the maximum temperature of the steam extraction chamber is 429℃, and the maximum pressure difference before and after the rotating baffle 26 is 1.216MPa.

[0047] In order to prevent the reheated steam in the second chamber from leaking out from between the medium-pressure inner cylinder 23 and the medium-pressure main shaft 21, an intermediate shaft seal is arranged between the medium-pressure inner cylinder 23 and the medium-pressure main shaft 21 to seal the gap between the medium-pressure inner cylinder 23 and the medium-pressure main shaft 21. At the same time, an medium-pressure front shaft seal 27 and a medium-pressure rear shaft seal 28 are respectively arranged between the two ends of the medium-pressure main shaft 21 and the medium-pressure outer cylinder 22 to seal the gap between the medium-pressure outer cylinder 22 and the medium-pressure main shaft 21. The medium-pressure front shaft seal 27 is arranged at the end where the medium-pressure main shaft 21 is connected to the high-pressure main shaft 13.

[0048] The supercritical heating steam turbine provided by the present invention has main steam ejected through a high-pressure steam inlet pipe, a first steam channel and a high-pressure nozzle and then enters a first chamber to drive the high-pressure cylinder flow stage to perform work, so as to convert the thermal energy of the main steam into mechanical energy; the reheated steam enters a second chamber of the medium-pressure cylinder to drive the medium-pressure cylinder flow stage to perform work, so as to convert the thermal energy of the reheated steam into mechanical energy; the high-pressure main shaft of the high-pressure cylinder and the medium-pressure main shaft of the medium-pressure cylinder are connected through a coupling; the mechanical energy is finally transmitted through the high-pressure main shaft and the medium-pressure main shaft; a high-pressure nozzle chamber is opened at one end of the first steam channel, so as to reduce the steam leakage points, greatly reduce the steam leakage, optimize the steam inlet flow channel, reduce the steam pressure loss, and solve the problem of low flow efficiency of the supercritical heating steam turbine in the prior art.

[0049] The above describes in detail the optional implementation modes of the embodiments of the present invention in combination with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above implementation modes. Within the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical scheme of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.

[0050] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

[0051] Those skilled in the art can understand that all or part of the steps in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a program, and the program is stored in a storage medium, including a number of instructions to enable a single-chip microcomputer, a chip or a processor to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0052] In addition, various implementation modes of the embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the embodiments of the present invention, they should also be regarded as the contents disclosed by the embodiments of the present invention.

Claims

1. A supercritical heating steam turbine, characterized in that: The supercritical heating steam turbine comprises: a high-pressure cylinder (1), a medium-pressure cylinder (2) and a coupling; The high-pressure cylinder (1) comprises a high-pressure cylinder body, a high-pressure main shaft (13), a high-pressure cylinder flow stage, a plurality of high-pressure steam inlet pipes (14) and a plurality of high-pressure nozzles (15); The high-pressure cylinder body has a first chamber, and the high-pressure main shaft (13) is arranged in the first chamber and passes through the first chamber to be connected to the medium-pressure main shaft (21); a plurality of first through holes and a plurality of first steam channels (121) are provided on the high-pressure cylinder body, one end of the first steam channel (121) is provided with a high-pressure nozzle chamber as a gas outlet, and each high-pressure nozzle chamber is provided with a high-pressure nozzle (15); a high-pressure steam inlet pipe (14) extends into the high-pressure cylinder body through a corresponding first through hole and is connected to the other end of the corresponding first steam channel (121); The high-pressure cylinder flow stage is arranged in the first chamber and is connected to the high-pressure main shaft (13) and the high-pressure cylinder body. The main steam is ejected through the high-pressure steam inlet pipe (14), the first steam channel (121) and the high-pressure nozzle (15) and then enters the first chamber to drive the high-pressure cylinder flow stage to perform work, thereby converting heat energy into mechanical energy. The mechanical energy is transmitted through the high-pressure main shaft (13); The intermediate-pressure cylinder (2) has a second chamber, and includes an intermediate-pressure main shaft (21) and an intermediate-pressure cylinder flow stage that are arranged in the second chamber and are connected to each other. By delivering reheated steam to the second chamber, the intermediate-pressure cylinder flow stage can be driven to perform work, thereby converting thermal energy into mechanical energy, and the mechanical energy is transmitted through the intermediate-pressure main shaft (21); wherein the intermediate-pressure main shaft (21) and the high-pressure main shaft (13) are connected via a coupling.

2. The supercritical heating steam turbine according to claim 1, characterized in that: The high-pressure cylinder comprises: a high-pressure inner cylinder (11) and a high-pressure outer cylinder (12); The chamber of the high-pressure inner cylinder (11) serves as a first chamber, the high-pressure outer cylinder (12) is arranged to cover the high-pressure inner cylinder (11), and the high-pressure main shaft (13) is arranged in the first chamber and passes through the first chamber to be connected to the medium-pressure main shaft (21); A plurality of first through holes are provided on the high-pressure outer cylinder (12), a plurality of first steam channels (121) are provided on the high-pressure inner cylinder (11), and a high-pressure steam inlet pipe (14) extends into the high-pressure outer cylinder (12) through corresponding first through holes and is connected to corresponding first steam channels (121).

3. The supercritical heating steam turbine according to claim 2, characterized in that: The high-pressure cylinder (1) further comprises: a high-pressure front shaft seal (18) and a high-pressure rear shaft seal (19); The high-pressure front shaft seal (18) and the high-pressure rear shaft seal (19) are respectively arranged at two ends of the high-pressure main shaft (13) and are located between the high-pressure main shaft (13) and the high-pressure outer cylinder body (12) to seal the gap between the high-pressure main shaft (13) and the high-pressure outer cylinder body (12).

4. The supercritical heating steam turbine according to claim 1, characterized in that: The high-pressure cylinder flow stage comprises: a first flow stage (16) and a second flow stage (17); the first flow stage (16) is arranged at the steam outlet of the high-pressure nozzle (15); main steam is ejected through the high-pressure steam inlet pipe (14), the first steam channel (121) and the high-pressure nozzle (15) and then enters the first chamber, driving the first flow stage (16) and the second flow stage (17) in sequence to perform work, so as to convert heat energy into mechanical energy, and the mechanical energy is transmitted through the high-pressure main shaft (13).

5. The supercritical heating steam turbine according to claim 4, characterized in that: The first flow-through stage (16) comprises a high-pressure regulating moving blade (161) arranged on the high-pressure main shaft (13).

6. The supercritical heating steam turbine according to claim 4, characterized in that: The second flow stage (17) comprises a plurality of high-pressure flow vanes (171) and a plurality of high-pressure flow stator blades (172); the plurality of high-pressure flow vanes (171) are arranged in parallel with each other in the first chamber at a first given interval and are connected to the high-pressure main shaft (13); a high-pressure flow stator blade (172) connected to the high-pressure inner cylinder (11) is arranged between two adjacent high-pressure flow vanes (171), so that the plurality of high-pressure flow vanes (171) and the plurality of high-pressure flow stator blades (172) are arranged in an interlaced manner.

7. The supercritical heating steam turbine according to claim 1, characterized in that: One end of each high-pressure steam inlet pipe (14) connected to the corresponding first steam channel (121) is provided with a connecting flange, and the high-pressure steam inlet pipe (14) is screwed to the corresponding first steam channel (121) via the connecting flange.

8. The supercritical heating steam turbine according to claim 1, characterized in that: The medium-pressure cylinder (2) further comprises: a medium-pressure outer cylinder body (22) and a medium-pressure inner cylinder body (23); The chamber of the medium-pressure inner cylinder (23) serves as a second chamber, the medium-pressure outer cylinder (22) is arranged to cover the medium-pressure inner cylinder (23), and the medium-pressure main shaft (21) is arranged in the second chamber and passes through the second chamber to be connected to the high-pressure main shaft (13).

9. The supercritical heating steam turbine according to claim 7, characterized in that: The intermediate pressure cylinder (2) further comprises: an intermediate pressure steam inlet pipe (29); A medium-pressure through hole is formed on the medium-pressure outer cylinder (22), a second steam passage is formed on the medium-pressure inner cylinder (23), one end of a medium-pressure steam inlet pipe (29) passes through the medium-pressure through hole and enters the medium-pressure outer cylinder (22) to be connected to the second steam passage, and reheated steam enters the second chamber through the medium-pressure steam inlet pipe and the second steam passage to drive the medium-pressure cylinder flow stage to perform work, thereby converting thermal energy into mechanical energy.

10. The supercritical heating steam turbine according to claim 9, characterized in that: The intermediate pressure cylinder flow stages include: a first blade cascade flow stage (24) and a second blade cascade flow stage (25); The first blade cascade flow stage (24) and the second blade cascade flow stage (25) are both arranged between the intermediate pressure main shaft (21) and the intermediate pressure inner cylinder (23), wherein the first blade cascade flow stage (24) is arranged at one end of the steam outlet of the second steam channel, and the reheated steam enters the second chamber after passing through the intermediate pressure steam inlet pipe and the second steam channel, and sequentially drives the first blade cascade flow stage (24) and the second blade cascade flow stage (25) to perform work.

11. The supercritical heating steam turbine according to claim 10, characterized in that: The No. 1 blade cascade flow stage (24) comprises a plurality of No. 1 moving blades (241) and a plurality of No. 1 stationary blades (242); the plurality of No. 1 moving blades (241) are arranged in parallel in the second chamber at a second given interval and are connected to the medium-pressure main shaft (21); a No. 1 stationary blade (242) connected to the medium-pressure inner cylinder (23) is arranged between two adjacent No. 1 moving blades (241), so that the plurality of No. 1 moving blades (241) and the plurality of No. 1 stationary blades (242) are arranged in an interlaced manner.

12. The supercritical heating steam turbine according to claim 10, characterized in that: The No. 2 blade cascade flow stage (25) comprises a plurality of No. 2 moving blades (251) and a plurality of No. 2 stationary blades (252); the plurality of No. 2 moving blades (251) are arranged in parallel with each other in the second chamber at a third given interval and are connected to the medium-pressure main shaft (21); a No. 2 stationary blade (252) connected to the medium-pressure inner cylinder (23) is arranged between two adjacent No. 2 moving blades (251), so that the plurality of No. 2 moving blades (251) and the plurality of No. 2 stationary blades (252) are arranged in an interlaced manner.

13. The supercritical heating steam turbine according to claim 10, characterized in that: The medium-pressure cylinder (2) further comprises: a rotating partition (26) arranged in the second chamber and sleeved on the medium-pressure main shaft (21), located between the first blade cascade flow stage (24) and the second blade cascade flow stage (25), dividing the second chamber into two sub-chambers.

14. The supercritical heating steam turbine according to claim 8, characterized in that: The medium-pressure cylinder (2) further comprises: a medium-pressure front shaft seal (27) and a medium-pressure rear shaft seal (28); The medium-pressure front shaft seal (27) and the medium-pressure rear shaft seal (28) are respectively arranged at two ends of the medium-pressure main shaft (21) and located between the medium-pressure main shaft (21) and the medium-pressure outer cylinder body (22) to seal the gap between the medium-pressure main shaft (21) and the medium-pressure outer cylinder body (22).

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