Through-flow adjusting system for double-steam-source mixed acting of small steam turbine under heat supply working condition

Abstract

The invention discloses a heat supply working condition small steam turbine double-steam-source mixed acting through-flow adjusting system, which relates to the technical field of small steam turbine through-flow, comprises a steam turbine rear bearing processing box, and further comprises a steam turbine exhaust box arranged on one side of the steam turbine rear bearing processing box, the system has the beneficial effects that the first high-pressure fire-resistant oil low-pressure main throttle valve oil cylinder and the high-pressure fire-resistant oil AST intercepting module are arranged, and multiple sets of non-pressure oil discharging pipelines, pressure oil pipelines, fire-resistant oil pipelines and pressure oil discharging pipelines are matched to be connected with different devices, so that one-by-one management and control by workers are facilitated; the intelligent operation level during equipment management is improved; the through-flow structure is further optimized, the high-pressure steam consumption and the low-pressure steam consumption of other heat supply working conditions are smaller than those of the maximum heat supply capacity working condition of a single machine, and the newly-added high-pressure steam pipeline of the small steam turbine is designed according to the maximum heat supply capacity working condition of the single machine to completely meet other operation working conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of the steam flow path of a small steam turbine, and specifically to a steam flow regulation system for a small steam turbine with dual steam sources for combined work under a heat supply condition. Background Art

[0002] For the existing No. 3 unit of the power plant to carry out heat supply transformation, the operating conditions of the steam turbine change. To meet the needs of boiler feed water, the small steam turbine needs to be transformed.

[0003] The general situation of the original equipment of the existing small steam turbine is as follows: The small steam turbine adopts an upper exhaust mode with a 0m layout. The integral forging rotor has a double-extended shaft structure. The inlet end drives the front-stage pump, and the exhaust end drives the feed water pump. The steam flow path adopts a structure of 1 single-row regulating stage + 5 pressure stages. The normal inlet steam of the small steam turbine comes from the fourth-stage extraction steam of the large steam turbine, and the commissioning steam source comes from the auxiliary steam header, without steam source switching. The original operating parameters of each working condition point of the small steam turbine are as follows: Taking the heat supply condition of a single 300t / h unit of the large steam turbine (hot press plan: main steam extraction volume 130.43t / h, high-temperature reheat extraction volume of the unit 169.57t / h) as an example, since reheated steam needs to be extracted, the inlet steam volume of the intermediate and low-pressure cylinders decreases accordingly, resulting in a large drop in the inlet steam pressure (from the fourth-stage extraction steam of the large steam turbine) of the small steam turbine, with little temperature change, and a large increase in the specific volume of the inlet steam of the small steam turbine (1.72 times the original). After calculation, according to the current steam flow capacity of the small steam turbine, it can only generate 6000KW, far less than the 12256KW required by the feed water pump group under this working condition. If the small steam turbine is not transformed as necessary, the small steam turbine cannot drive the feed water pump group under the extraction steam condition of the large steam turbine.

[0004] Therefore, in combination with the heat balance diagram of the large steam turbine and the structure of the small steam turbine, it is necessary to transform the steam flow path structure of the small steam turbine, and by adding an internal switching method, the transformed small steam turbine can meet the requirements of the boiler feed water pump power and speed under the two working conditions of heat supply and pure condensation of the large steam turbine.

[0005] However, when the heat supply of the large steam turbine is 300t / h, the fourth-stage extraction steam pressure drops to 0.533MPa. The pressure after the regulating stage of the small steam turbine is only 0.25MPa at the rated speed of 5811rpm. The original number of pressure stages of the small steam turbine is significantly too many, and it needs to be transformed by reducing the number of stages. At the same time, to ensure the effective mixing of high- and low-pressure steam after the regulating stage of the small steam turbine, the pressure of the high-pressure steam should also be reduced to about 0.25MPa after doing work through the regulating stage. This requires the high-pressure steam to be throttled through the high-pressure regulating valve, and inevitably a certain throttling loss will be generated. According to the heat balance diagram provided by the large steam turbine, under this working condition, if the small steam turbine outputs a rated power of 12256KW, after calculation, the extraction steam consumption of the fourth extraction is 32.21t / h, and the steam consumption of the second-stage cold section steam is ~50t / h.

[0006] Under the pure condensing condition of the large steam turbine, all the extraction steam from the fourth stage of the large steam turbine is used for the small steam turbine. However, since the small steam turbine has been downgraded to meet the heating condition, the efficiency of the small steam turbine has also decreased compared with that before the transformation. To output the same rated power of 12,256 KW, the steam consumption needs to be increased by about 5 t / h.

[0007] Therefore, the present invention needs to design a through-flow regulation system for the double-steam-source hybrid work of the small steam turbine under the heating condition to solve the above problems. Summary of the Invention

[0008] The purpose of the present invention is to provide a through-flow regulation system for the double-steam-source hybrid work of the small steam turbine under the heating condition to solve the problems raised in the above background technology.

[0009] To achieve the above purpose, the present invention provides the following technical solution: A through-flow regulation system for the double-steam-source hybrid work of the small steam turbine under the heating condition, including the machining box of the rear bearing of the steam turbine, and further including: On one side of the machining box of the rear bearing of the steam turbine, a steam turbine exhaust box is installed. On the side of the steam turbine exhaust box away from the machining box of the rear bearing of the steam turbine, a machining table is installed. Inside the machining table, a machining box of the front bearing of the steam turbine is installed. On one side of the machining box of the front bearing of the steam turbine, an anti-foaming oil treatment chamber is installed. At the bottom of the anti-foaming oil treatment chamber, a bottom installation pipeline is installed. One end of the bottom installation pipeline is installed with a conveying channel; Inside the anti-foaming oil treatment chamber, an anti-foaming oil safety oil main pipeline, a pressurized drain oil main pipeline, a pressure oil main pipeline, and a non-pressurized drain oil main pipeline are installed. The anti-foaming oil safety oil main pipeline is located on the side away from the pressurized drain oil main pipeline. The pressure oil main pipeline is located between the non-pressurized drain oil main pipeline and the pressurized drain oil main pipeline. One ends of the non-pressurized drain oil main pipeline, the pressure oil main pipeline, and the pressurized drain oil main pipeline are installed with a high-pressure anti-foaming oil source outlet; A second high-pressure fire-resistant oil low-pressure main steam valve oil cylinder and a second high-pressure fire-resistant oil low-pressure governor valve oil motor are installed between the main pipeline of the fire-resistant oil security oil and the main pipeline of the pressurized oil drainage. The second high-pressure fire-resistant oil low-pressure governor valve oil motor is located on one side of the second high-pressure fire-resistant oil low-pressure main steam valve oil cylinder. A first high-pressure fire-resistant oil low-pressure main steam valve oil cylinder is installed on the side of the second high-pressure fire-resistant oil low-pressure governor valve oil motor away from the second high-pressure fire-resistant oil low-pressure main steam valve oil cylinder. A first high-pressure fire-resistant oil low-pressure governor valve oil motor is installed on the side of the first high-pressure fire-resistant oil low-pressure main steam valve oil cylinder away from the second high-pressure fire-resistant oil low-pressure governor valve oil motor. A high-pressure fire-resistant oil AST shutdown module is installed on the side of the first high-pressure fire-resistant oil low-pressure governor valve oil motor away from the first high-pressure fire-resistant oil low-pressure main steam valve oil cylinder. A high-pressure fire-resistant oil manual trip valve is installed on the side of the high-pressure fire-resistant oil AST shutdown module away from the first high-pressure fire-resistant oil low-pressure governor valve oil motor. A third high-pressure fire-resistant oil filter is installed between the second high-pressure fire-resistant oil low-pressure governor valve oil motor and the main pipeline of the pressurized oil drainage. A high-pressure fire-resistant oil accumulator is installed between the high-pressure fire-resistant oil AST shutdown module and the main pipeline of the pressurized oil drainage. A first high-pressure fire-resistant oil filter is installed between the first high-pressure fire-resistant oil low-pressure governor valve oil motor and the main pipeline of the pressurized oil drainage. The first high-pressure fire-resistant oil filter is located on one side of the high-pressure fire-resistant oil accumulator. The third high-pressure fire-resistant oil filter is located on the side away from the first high-pressure fire-resistant oil filter; An oil station is installed inside the fire-resistant oil treatment chamber and on one side of the main pipeline of the fire-resistant oil security oil.

[0010] As a preferred embodiment of the present invention, a low-pressure turbine oil mechanism is installed inside the oil station. The low-pressure turbine oil mechanism includes an oil tank. An oil tank is installed inside the oil station. A vertical centrifugal oil pump and an emergency centrifugal oil pump are installed on one side of the oil tank. The emergency centrifugal oil pump is located on one side of the vertical centrifugal oil pump. A cooler is installed on one side of the oil tank. Two second accumulators are installed on the side of the cooler away from the oil tank. A second high-pressure fire-resistant oil filter is installed on one side of the two second accumulators.

[0011] As a preferred embodiment of the present invention, a third lubricating oil conveying pipeline is installed between the oil cooler and the oil tank. A temperature control valve is installed on the outer side of the third lubricating oil conveying pipeline and close to the oil cooler. A second lubricating oil conveying pipeline is installed between the temperature control valve and the second high-pressure fire-resistant oil filter. One end of the second lubricating oil conveying pipeline extends into the oil tank. A first lubricating oil conveying pipeline is installed on one side of the second high-pressure fire-resistant oil filter. A lubricating oil pressure regulating valve is installed on the outer side of the first lubricating oil conveying pipeline and close to the second high-pressure fire-resistant oil filter. An oil inlet for each bearing is installed on one side of the first lubricating oil conveying pipeline. The third lubricating oil conveying pipeline, the second lubricating oil conveying pipeline and the first lubricating oil conveying pipeline cooperate to assist in connecting each device inside the oil station, so as to cooperate with the non-pressure oil discharge main pipeline, the pressure oil main pipeline and the pressure oil discharge main pipeline for connection.

[0012] As a preferred embodiment of the present invention, a second fire-resistant oil pipeline extending into the fire-resistant oil security oil main pipeline is installed on one side of the second high-pressure fire-resistant oil low-pressure main steam valve cylinder. A second non-pressure oil discharge pipeline extending into the non-pressure oil discharge main pipeline is installed on the other side of the second high-pressure fire-resistant oil low-pressure main steam valve cylinder. A second pressure oil pipeline extending into the pressure oil main pipeline is installed on the outer side of the second high-pressure fire-resistant oil low-pressure main steam valve cylinder. A second pressure oil discharge pipeline extending into the pressure oil discharge main pipeline is installed on the outer side of the second high-pressure fire-resistant oil low-pressure main steam valve cylinder. The oil inside the second high-pressure fire-resistant oil low-pressure main steam valve cylinder is conveyed into the corresponding fire-resistant oil security oil main pipeline through the cooperation of the second fire-resistant oil pipeline, into the corresponding non-pressure oil discharge main pipeline through the cooperation of the second non-pressure oil discharge pipeline, into the corresponding pressure oil main pipeline through the cooperation of the second pressure oil pipeline, and into the corresponding pressure oil discharge main pipeline through the cooperation of the second pressure oil discharge pipeline.

[0013] As a preferred embodiment of the present invention, a third anti - fuel oil pipeline extending into the main anti - fuel oil security pipeline is installed on one side of the oil motor of the second high - pressure anti - fuel oil low - pressure regulating valve. A third non - pressurized oil discharge pipeline extending into the main non - pressurized oil discharge pipeline is installed on the other side of the oil motor of the second high - pressure anti - fuel oil low - pressure regulating valve. A third pressure oil pipeline extending into the main pressure oil pipeline is installed on the outside of the oil motor of the second high - pressure anti - fuel oil low - pressure regulating valve. A third pressurized oil discharge pipeline passing through the third high - pressure anti - fuel oil filter and extending into the main pressurized oil discharge pipeline is installed on the outside of the oil motor of the second high - pressure anti - fuel oil low - pressure regulating valve. Through the cooperation of the third anti - fuel oil pipeline, the oil inside the oil motor of the second high - pressure anti - fuel oil low - pressure regulating valve is transported into the corresponding main anti - fuel oil security pipeline. Through the cooperation of the third non - pressurized oil discharge pipeline, the oil inside the oil motor of the second high - pressure anti - fuel oil low - pressure regulating valve is transported into the corresponding main non - pressurized oil discharge pipeline. Through the cooperation of the third pressure oil pipeline, the oil inside the oil motor of the second high - pressure anti - fuel oil low - pressure regulating valve is transported into the corresponding main pressure oil pipeline. Through the cooperation of the third pressurized oil discharge pipeline, the oil inside the oil motor of the second high - pressure anti - fuel oil low - pressure regulating valve and the third high - pressure anti - fuel oil filter is transported into the corresponding main pressurized oil discharge pipeline.

[0014] As a preferred embodiment of the present invention, a first anti - fuel oil pipeline extending into the main anti - fuel oil security pipeline is installed on one side of the oil cylinder of the first high - pressure anti - fuel oil low - pressure main steam valve. A first non - pressurized oil discharge pipeline extending into the main non - pressurized oil discharge pipeline is installed on the other side of the oil cylinder of the first high - pressure anti - fuel oil low - pressure main steam valve. A first pressure oil pipeline extending into the main pressure oil pipeline is installed on the outside of the oil cylinder of the first high - pressure anti - fuel oil low - pressure main steam valve. A first pressurized oil discharge pipeline extending into the main pressurized oil discharge pipeline is installed on the outside of the oil cylinder of the first high - pressure anti - fuel oil low - pressure main steam valve. Through the cooperation of the first anti - fuel oil pipeline, the oil inside the oil cylinder of the first high - pressure anti - fuel oil low - pressure main steam valve is transported into the corresponding main anti - fuel oil security pipeline. Through the cooperation of the first non - pressurized oil discharge pipeline, the oil inside the oil cylinder of the first high - pressure anti - fuel oil low - pressure main steam valve is transported into the corresponding main non - pressurized oil discharge pipeline. Through the cooperation of the first pressure oil pipeline, the oil inside the oil cylinder of the first high - pressure anti - fuel oil low - pressure main steam valve is transported into the corresponding main pressure oil pipeline. Through the cooperation of the first pressurized oil discharge pipeline, the oil inside the oil cylinder of the first high - pressure anti - fuel oil low - pressure main steam valve is transported into the corresponding main pressurized oil discharge pipeline.

[0015] As a preferred embodiment of the present invention, a fourth anti - fuel oil pipeline extending into the main anti - fuel oil security pipeline is installed on one side of the first high - pressure anti - fuel oil low - pressure regulating valve oil motor. A fourth pressure oil pipeline extending into the main non - pressure oil discharge pipeline is installed on the other side of the first high - pressure anti - fuel oil low - pressure regulating valve oil motor. A fourth pressurized oil discharge pipeline that penetrates through the first high - pressure anti - fuel oil filter and extends into the main pressure oil pipeline is installed outside the first high - pressure anti - fuel oil low - pressure regulating valve oil motor. A fourth non - pressurized oil discharge pipeline extending into the main pressurized oil discharge pipeline is installed outside the first high - pressure anti - fuel oil low - pressure regulating valve oil motor. Through the cooperation of the fourth anti - fuel oil pipeline, the oil inside the first high - pressure anti - fuel oil low - pressure regulating valve oil motor is transported into the corresponding main anti - fuel oil security pipeline. Through the cooperation of the fourth pressure oil pipeline, the oil inside the first high - pressure anti - fuel oil low - pressure regulating valve oil motor is transported into the corresponding main non - pressure oil discharge pipeline. Through the cooperation of the fourth pressurized oil discharge pipeline, the oil inside the first high - pressure anti - fuel oil low - pressure regulating valve oil motor and the first high - pressure anti - fuel oil filter is transported into the corresponding main pressure oil pipeline. Through the cooperation of the fourth non - pressurized oil discharge pipeline, the oil inside the first high - pressure anti - fuel oil low - pressure regulating valve oil motor is transported into the corresponding main pressurized oil discharge pipeline.

[0016] As a preferred embodiment of the present invention, a fifth anti - fuel oil pipeline extending into the main anti - fuel oil security pipeline is installed on one side of the high - pressure anti - fuel oil AST shut - off module. A conveying main pipeline that sequentially penetrates through the main pressurized oil discharge pipeline, the main pressure oil pipeline, and the main non - pressure oil discharge pipeline is installed on the other side of the high - pressure anti - fuel oil AST shut - off module. A connecting pipeline is installed on one side of the high - pressure anti - fuel oil manual trip valve. One end of the connecting pipeline is connected to the main anti - fuel oil security pipeline, and the other end of the connecting pipeline is connected to the conveying main pipeline. A fifth pressure oil pipeline extending into the main pressure oil pipeline is installed on one side of the high - pressure anti - fuel oil accumulator. Fifth non - pressurized oil discharge pipelines are installed on both sides of the fifth pressure oil pipeline, and both of the two fifth non - pressurized oil discharge pipelines are connected to the main non - pressure oil discharge pipeline.

[0017] As a preferred embodiment of the present invention, a second support seat is fixedly connected to the bottom of the processing table. A first support seat is fixedly connected to the bottom of the steam turbine rear bearing processing box. Limit baffles are installed outside the steam turbine exhaust box and the steam turbine front bearing processing box. The limit baffles are used to reinforce the connection between the steam turbine exhaust box and the steam turbine front bearing processing box. The steam turbine rear bearing processing box is supported by the first support seat, and the processing table is supported by the second support seat, thereby improving the stability of the equipment during operation.

[0018] As a preferred embodiment of the present invention, a control panel is installed outside the steam turbine exhaust box. The first high-pressure fire-resistant oil low-pressure main steam valve oil cylinder, the first high-pressure fire-resistant oil low-pressure governor valve oil motor, the high-pressure fire-resistant oil manual trip valve, the first high-pressure fire-resistant oil filter, the high-pressure fire-resistant oil accumulator, the second accumulator, the temperature control valve, the oil cooler, the second high-pressure fire-resistant oil filter, the vertical centrifugal oil pump, the emergency centrifugal oil pump, the lubricating oil pressure regulating valve, the second high-pressure fire-resistant oil low-pressure main steam valve oil cylinder, the second high-pressure fire-resistant oil low-pressure governor valve oil motor, and the third high-pressure fire-resistant oil filter are all electrically connected to the control panel. The control panel is used to control the operation of the first high-pressure fire-resistant oil low-pressure main steam valve oil cylinder, the first high-pressure fire-resistant oil low-pressure governor valve oil motor, the high-pressure fire-resistant oil manual trip valve, the first high-pressure fire-resistant oil filter, the high-pressure fire-resistant oil accumulator, the second accumulator, the temperature control valve, the oil cooler, the second high-pressure fire-resistant oil filter, the vertical centrifugal oil pump, the emergency centrifugal oil pump, the lubricating oil pressure regulating valve, the second high-pressure fire-resistant oil low-pressure main steam valve oil cylinder, the second high-pressure fire-resistant oil low-pressure governor valve oil motor, and the third high-pressure fire-resistant oil filter, realizing the unified management of power equipment.

[0019] Compared with the prior art, the beneficial effects of the present invention are: 1. The present invention is provided with a first high-pressure fire-resistant oil low-pressure main steam valve oil cylinder, a first high-pressure fire-resistant oil low-pressure governor valve oil motor, and a high-pressure fire-resistant oil AST shut-off module. Through the cooperation of the fourth pressure oil pipeline, the oil inside the first high-pressure fire-resistant oil low-pressure governor valve oil motor is transported to the corresponding non-pressure oil discharge main pipeline. Through the cooperation of the fourth pressurized oil discharge pipeline, the oil inside the first high-pressure fire-resistant oil low-pressure governor valve oil motor and the first high-pressure fire-resistant oil filter is transported to the corresponding pressure oil main pipeline. Through the cooperation of the fourth non-pressure oil discharge pipeline, the oil inside the first high-pressure fire-resistant oil low-pressure governor valve oil motor is transported to the corresponding pressurized oil discharge main pipeline. The limit baffle is used to reinforce the connection between the steam turbine exhaust box and the steam turbine front bearing processing box. The first support seat supports the steam turbine rear bearing processing box, and the second support seat supports the processing table, thereby improving the stability of the equipment during operation. Through the cooperation of multiple non-pressure oil discharge pipelines, pressure oil pipelines, fire-resistant oil pipelines, and pressurized oil discharge pipelines, they are respectively connected to different equipment, facilitating the staff to control them one by one and improving the intelligent operation level during equipment management; 2. The present invention further optimizes the flow passage structure. On the premise of meeting safety and output, the efficiency of the unit is improved as much as possible. This transformation plan has been verified by thermal calculation, aerodynamic and strength analysis of the flow passage part, and axial thrust calculation. It is confirmed that this plan is safe and reliable and can meet the requirements of driving the feed water pump group under the conditions of large machine pure condensation and heat supply. After the transformation, the data writing of the small steam turbine has been checked. The high and low pressure steam consumption in other heat supply conditions is less than that in the single-unit maximum heat supply capacity condition. The newly added high-pressure steam pipeline of the small steam turbine is designed according to the single-unit maximum heat supply capacity condition and fully meets other operating conditions. Description of the Drawings

[0020] Figure 1 This is the overall structural schematic diagram of the flow regulation system for the double-steam-source hybrid work of the small steam turbine under the heating condition of the present invention; Figure 2 This is the overall structural system diagram of the flow regulation system for the double-steam-source hybrid work of the small steam turbine under the heating condition of the present invention; Figure 3 This is the structural diagram of the low-pressure turbine oil mechanism of the flow regulation system for the double-steam-source hybrid work of the small steam turbine under the heating condition of the present invention.

[0021] In the figure: 1. First high-pressure fire-resistant oil low-pressure main steam valve oil cylinder; 2. First high-pressure fire-resistant oil low-pressure regulating valve oil motor; 3. High-pressure fire-resistant oil AST shut-off module; 4. High-pressure fire-resistant oil manual trip valve; 5. First high-pressure fire-resistant oil filter; 6. High-pressure fire-resistant oil accumulator; 7. Second accumulator; 8. Temperature control valve; 9. Oil cooler; 10. Second high-pressure fire-resistant oil filter; 11. Vertical centrifugal oil pump; 12. Emergency centrifugal oil pump; 13. Oil tank; 14. Lubricating oil pressure regulating valve; 15. Oil station; 16. Second high-pressure fire-resistant oil low-pressure main steam valve oil cylinder; 17. Second high-pressure fire-resistant oil low-pressure regulating valve oil motor; 18. Third high-pressure fire-resistant oil filter; 111. Fire-resistant oil safety oil main pipeline; 112. Connecting pipeline; 113. First non-pressure oil discharge pipeline; 114. First pressure oil discharge pipeline; 115. Non-pressure oil discharge main pipeline; 116. Pressure oil main pipeline; 117. Pressure oil discharge main pipeline; 118. First fire-resistant oil pipeline; 119. First pressure oil pipeline; 161. Second fire-resistant oil pipeline; 162. Second non-pressure oil discharge pipeline; 163. Second pressure oil pipeline; 164. Second pressure oil discharge pipeline; 171. Third fire-resistant oil pipeline; 172. Third non-pressure oil discharge pipeline; 173. Third pressure oil pipeline; 174. Third pressure oil discharge pipeline; 21. Fourth fire-resistant oil pipeline; 22. Fourth non-pressure oil discharge pipeline; 23. Fourth pressure oil pipeline; 24. Fourth pressure oil discharge pipeline; 31. Fifth fire-resistant oil pipeline; 61. Fifth non-pressure oil discharge pipeline; 62. Fifth pressure oil pipeline; 19. Delivery main pipeline; 191. High-pressure fire-resistant oil source outlet; 192. Inlet for each bearing; 193. First lubricating oil delivery pipeline; 194. Second lubricating oil delivery pipeline; 195. Third lubricating oil delivery pipeline; 20. First support base; 201. Second support base; 202. Turbine rear bearing processing box; 203. Turbine exhaust box; 204. Processing table; 205. Turbine front bearing processing box; 206. Limit baffle; 207. Fire-resistant oil treatment chamber; 208. Bottom installation pipeline; 209. Delivery channel. Detailed implementation manner

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0023] Please refer to Figures 1 - 3 , the present invention provides a technical solution: a through-flow regulation system for a small steam turbine with dual steam sources mixing and doing work under a heating condition, including a turbine rear bearing processing box 202, and further including: a turbine exhaust box 203 is installed on one side of the turbine rear bearing processing box 202, a processing table 204 is installed on the side of the turbine exhaust box 203 away from the turbine rear bearing processing box 202, a turbine front bearing processing box 205 is installed inside the processing table 204, a fire-resistant oil treatment chamber 207 is installed on one side of the turbine front bearing processing box 205, a bottom installation pipeline 208 is installed at the bottom of the fire-resistant oil treatment chamber 207, and a delivery channel 209 is installed at one end of the bottom installation pipeline 208; In this solution, a fire-resistant oil security oil main pipeline 111, a pressurized oil drain main pipeline 117, a pressure oil main pipeline 116, and a non-pressurized oil drain main pipeline 115 are installed inside the fire-resistant oil treatment chamber 207. The fire-resistant oil security oil main pipeline 111 is located on the side away from the pressurized oil drain main pipeline 117, the pressure oil main pipeline 116 is located between the non-pressurized oil drain main pipeline 115 and the pressurized oil drain main pipeline 117, and a high-pressure fire-resistant oil source outlet 191 is installed at one end of the non-pressurized oil drain main pipeline 115, the pressure oil main pipeline 116, and the pressurized oil drain main pipeline 117; In this solution, a second high-pressure fire-resistant oil low-pressure main steam valve oil cylinder 16 and a second high-pressure fire-resistant oil low-pressure governing valve oil actuator 17 are installed between the fire-resistant oil security oil main pipeline 111 and the pressurized oil drain main pipeline 117. The second high-pressure fire-resistant oil low-pressure governing valve oil actuator 17 is located on one side of the second high-pressure fire-resistant oil low-pressure main steam valve oil cylinder 16. On the side of the second high-pressure fire-resistant oil low-pressure governing valve oil actuator 17 far from the second high-pressure fire-resistant oil low-pressure main steam valve oil cylinder 16, a first high-pressure fire-resistant oil low-pressure main steam valve oil cylinder 1 is installed. On the side of the first high-pressure fire-resistant oil low-pressure main steam valve oil cylinder 1 far from the second high-pressure fire-resistant oil low-pressure governing valve oil actuator 17, a first high-pressure fire-resistant oil low-pressure governing valve oil actuator 2 is installed. On the side of the first high-pressure fire-resistant oil low-pressure governing valve oil actuator 2 far from the first high-pressure fire-resistant oil low-pressure main steam valve oil cylinder 1, a high-pressure fire-resistant oil AST shut-off module 3 is installed. On the side of the high-pressure fire-resistant oil AST shut-off module 3 far from the first high-pressure fire-resistant oil low-pressure governing valve oil actuator 2, a high-pressure fire-resistant oil manual trip valve 4 is installed. A third high-pressure fire-resistant oil filter 18 is installed between the second high-pressure fire-resistant oil low-pressure governing valve oil actuator 17 and the pressurized oil drain main pipeline 117. A high-pressure fire-resistant oil accumulator 6 is installed between the high-pressure fire-resistant oil AST shut-off module 3 and the pressurized oil drain main pipeline 117. A first high-pressure fire-resistant oil filter 5 is installed between the first high-pressure fire-resistant oil low-pressure governing valve oil actuator 2 and the pressurized oil drain main pipeline 117. The first high-pressure fire-resistant oil filter 5 is located on one side of the high-pressure fire-resistant oil accumulator 6. The third high-pressure fire-resistant oil filter 18 is located on the side far from the first high-pressure fire-resistant oil filter 5; Inside the fire-resistant oil treatment chamber 207 of this solution and on one side of the fire-resistant oil security oil main pipeline 111, an oil station 15 is installed.

[0024] Please refer to Figures 1 - 3 , inside the oil station 15 of this solution, a low-pressure turbine oil mechanism is installed. The low-pressure turbine oil mechanism includes an oil tank 13. An oil tank 13 is installed inside the oil station 15. A vertical centrifugal oil pump 11 and an emergency centrifugal oil pump 12 are installed on one side of the oil tank 13. The emergency centrifugal oil pump 12 is located on one side of the vertical centrifugal oil pump 11. A oil cooler 9 is installed on one side of the oil tank 13. Two second accumulators 7 are installed on the side of the oil cooler 9 far from the oil tank 13. A second high-pressure fire-resistant oil filter 10 is installed on one side of the two second accumulators 7.

[0025] In this solution, a third lubricating oil delivery pipeline 195 is installed between the oil cooler 9 and the oil tank 13. A temperature control valve 8 is installed on the outer side of the third lubricating oil delivery pipeline 195 and close to the oil cooler 9. A second lubricating oil delivery pipeline 194 is installed between the temperature control valve 8 and the second high-pressure fire-resistant oil filter 10. One end of the second lubricating oil delivery pipeline 194 extends into the oil tank 13. A first lubricating oil delivery pipeline 193 is installed on one side of the second high-pressure fire-resistant oil filter 10. A lubricating oil pressure regulating valve 14 is installed on the outer side of the first lubricating oil delivery pipeline 193 and close to the second high-pressure fire-resistant oil filter 10. An oil inlet 192 for each bearing is installed on one side of the first lubricating oil delivery pipeline 193. The third lubricating oil delivery pipeline 195, the second lubricating oil delivery pipeline 194 and the first lubricating oil delivery pipeline 193 cooperate to assist in connecting each device inside the oil station 15, so as to cooperate with the non-pressure oil discharge main pipeline 115, the pressure oil main pipeline 116 and the pressure oil discharge main pipeline 117 for connection.

[0026] Please refer to Figures 1 - 3 , in this solution, a second fire-resistant oil pipeline 161 extending into the fire-resistant oil safety oil main pipeline 111 is installed on one side of the second high-pressure fire-resistant oil low-pressure main steam valve oil cylinder 16. A second non-pressure oil discharge pipeline 162 extending into the non-pressure oil discharge main pipeline 115 is installed on the other side of the second high-pressure fire-resistant oil low-pressure main steam valve oil cylinder 16. A second pressure oil pipeline 163 extending into the pressure oil main pipeline 116 is installed on the outer side of the second high-pressure fire-resistant oil low-pressure main steam valve oil cylinder 16. A second pressure oil discharge pipeline 164 extending into the pressure oil discharge main pipeline 117 is installed on the outer side of the second high-pressure fire-resistant oil low-pressure main steam valve oil cylinder 16. The oil inside the second high-pressure fire-resistant oil low-pressure main steam valve oil cylinder 16 is transported into the corresponding fire-resistant oil safety oil main pipeline 111 through the cooperation of the second fire-resistant oil pipeline 161, transported into the corresponding non-pressure oil discharge main pipeline 115 through the cooperation of the second non-pressure oil discharge pipeline 162, transported into the corresponding pressure oil main pipeline 116 through the cooperation of the second pressure oil pipeline 163, and transported into the corresponding pressure oil discharge main pipeline 117 through the cooperation of the second pressure oil discharge pipeline 164.

[0027] In this solution, a third anti - fuel oil pipeline 171 extending into the anti - fuel oil safety oil main pipeline 111 is installed on one side of the second high - pressure anti - fuel oil low - pressure regulating valve oil motor 17. A third non - pressurized oil discharge pipeline 172 extending into the non - pressurized oil discharge main pipeline 115 is installed on the other side of the second high - pressure anti - fuel oil low - pressure regulating valve oil motor 17. A third pressure oil pipeline 173 extending into the pressure oil main pipeline 116 is installed outside the second high - pressure anti - fuel oil low - pressure regulating valve oil motor 17. A third pressurized oil discharge pipeline 174 passing through the third high - pressure anti - fuel oil filter 18 and extending into the pressurized oil discharge main pipeline 117 is installed outside the second high - pressure anti - fuel oil low - pressure regulating valve oil motor 17. Through the cooperation of the third anti - fuel oil pipeline 171, the oil inside the second high - pressure anti - fuel oil low - pressure regulating valve oil motor 17 is transported into the corresponding anti - fuel oil safety oil main pipeline 111. Through the cooperation of the third non - pressurized oil discharge pipeline 172, the oil inside the second high - pressure anti - fuel oil low - pressure regulating valve oil motor 17 is transported into the corresponding non - pressurized oil discharge main pipeline 115. Through the cooperation of the third pressure oil pipeline 173, the oil inside the second high - pressure anti - fuel oil low - pressure regulating valve oil motor 17 is transported into the corresponding pressure oil main pipeline 116. Through the cooperation of the third pressurized oil discharge pipeline 174, the oil inside the second high - pressure anti - fuel oil low - pressure regulating valve oil motor 17 and the third high - pressure anti - fuel oil filter 18 is transported into the corresponding pressurized oil discharge main pipeline 117.

[0028] In this solution, a first anti - fuel oil pipeline 118 extending into the anti - fuel oil safety oil main pipeline 111 is installed on one side of the first high - pressure anti - fuel oil low - pressure main steam valve oil cylinder 1. A first non - pressurized oil discharge pipeline 113 extending into the non - pressurized oil discharge main pipeline 115 is installed on the other side of the first high - pressure anti - fuel oil low - pressure main steam valve oil cylinder 1. A first pressure oil pipeline 119 extending into the pressure oil main pipeline 116 is installed outside the first high - pressure anti - fuel oil low - pressure main steam valve oil cylinder 1. A first pressurized oil discharge pipeline 114 extending into the pressurized oil discharge main pipeline 117 is installed outside the first high - pressure anti - fuel oil low - pressure main steam valve oil cylinder 1. Through the cooperation of the first anti - fuel oil pipeline 118, the oil inside the first high - pressure anti - fuel oil low - pressure main steam valve oil cylinder 1 is transported into the corresponding anti - fuel oil safety oil main pipeline 111. Through the cooperation of the first non - pressurized oil discharge pipeline 113, the oil inside the first high - pressure anti - fuel oil low - pressure main steam valve oil cylinder 1 is transported into the corresponding non - pressurized oil discharge main pipeline 115. Through the cooperation of the first pressure oil pipeline 119, the oil inside the first high - pressure anti - fuel oil low - pressure main steam valve oil cylinder 1 is transported into the corresponding pressure oil main pipeline 116. Through the cooperation of the first pressurized oil discharge pipeline 114, the oil inside the first high - pressure anti - fuel oil low - pressure main steam valve oil cylinder 1 is transported into the corresponding pressurized oil discharge main pipeline 117.

[0029] In this solution, a fourth anti - fuel oil pipeline 21 extending into the internal part of the anti - fuel oil safety oil main pipeline 111 is installed on one side of the first high - pressure anti - fuel oil low - pressure regulating valve oil motor 2. A fourth pressure oil pipeline 23 extending into the internal part of the non - pressure oil discharge main pipeline 115 is installed on the other side of the first high - pressure anti - fuel oil low - pressure regulating valve oil motor 2. A fourth pressurized oil discharge pipeline 24 passing through the first high - pressure anti - fuel oil filter 5 and extending into the internal part of the pressure oil main pipeline 116 is installed outside the first high - pressure anti - fuel oil low - pressure regulating valve oil motor 2. A fourth non - pressurized oil discharge pipeline 22 extending into the internal part of the pressurized oil discharge main pipeline 117 is installed outside the first high - pressure anti - fuel oil low - pressure regulating valve oil motor 2. Through the cooperation of the fourth anti - fuel oil pipeline 21, the oil inside the first high - pressure anti - fuel oil low - pressure regulating valve oil motor 2 is transported into the corresponding anti - fuel oil safety oil main pipeline 111. Through the cooperation of the fourth pressure oil pipeline 23, the oil inside the first high - pressure anti - fuel oil low - pressure regulating valve oil motor 2 is transported into the corresponding non - pressure oil discharge main pipeline 115. Through the cooperation of the fourth pressurized oil discharge pipeline 24, the oil inside the first high - pressure anti - fuel oil low - pressure regulating valve oil motor 2 and the first high - pressure anti - fuel oil filter 5 is transported into the corresponding pressure oil main pipeline 116. Through the cooperation of the fourth non - pressurized oil discharge pipeline 22, the oil inside the first high - pressure anti - fuel oil low - pressure regulating valve oil motor 2 is transported into the corresponding pressurized oil discharge main pipeline 117.

[0030] Please refer to Figures 1 - 3 , in this solution, a fifth anti - fuel oil pipeline 31 extending into the internal part of the anti - fuel oil safety oil main pipeline 111 is installed on one side of the high - pressure anti - fuel oil AST shut - off module 3. On the other side of the high - pressure anti - fuel oil AST shut - off module 3, a conveying main pipeline 19 passing through the pressurized oil discharge main pipeline 117, the pressure oil main pipeline 116 and the non - pressure oil discharge main pipeline 115 in sequence is installed. On one side of the high - pressure anti - fuel oil manual trip valve 4, a connecting pipeline 112 is installed. One end of the connecting pipeline 112 is connected to the anti - fuel oil safety oil main pipeline 111, and the other end of the connecting pipeline 112 is connected to the conveying main pipeline 19. On one side of the high - pressure anti - fuel oil accumulator 6, a fifth pressure oil pipeline 62 extending into the internal part of the pressure oil main pipeline 116 is installed. On both sides of the fifth pressure oil pipeline 62, fifth non - pressurized oil discharge pipelines 61 are installed, and both of the two fifth non - pressurized oil discharge pipelines 61 are connected to the non - pressure oil discharge main pipeline 115.

[0031] Please refer to Figure 1 , in this solution, a second support base 201 is fixedly connected to the bottom of the processing table 204. A first support base 20 is fixedly connected to the bottom of the steam turbine rear bearing processing box 202. Limit baffles 206 are installed outside the steam turbine exhaust box 203 and the steam turbine front bearing processing box 205. The limit baffles 206 are used to strengthen the connection of the steam turbine exhaust box 203 and the steam turbine front bearing processing box 205. The steam turbine rear bearing processing box 202 is supported by the first support base 20, and the processing table 204 is supported by the second support base 201, thereby improving the stability of the equipment during operation.

[0032] In this solution, a control panel is installed outside the steam turbine exhaust box 203. The first high-pressure anti-fuel oil low-pressure main steam valve oil cylinder 1, the first high-pressure anti-fuel oil low-pressure governor valve oil motor 2, the high-pressure anti-fuel oil manual trip valve 4, the first high-pressure anti-fuel oil filter 5, the high-pressure anti-fuel oil accumulator 6, the second accumulator 7, the temperature control valve 8, the oil cooler 9, the second high-pressure anti-fuel oil filter 10, the vertical centrifugal oil pump 11, the emergency centrifugal oil pump 12, the lubricating oil pressure regulating valve 14, the second high-pressure anti-fuel oil low-pressure main steam valve oil cylinder 16, the second high-pressure anti-fuel oil low-pressure governor valve oil motor 17 and the third high-pressure anti-fuel oil filter 18 are all electrically connected to the control panel. The control panel is used to control the operation of the first high-pressure anti-fuel oil low-pressure main steam valve oil cylinder 1, the first high-pressure anti-fuel oil low-pressure governor valve oil motor 2, the high-pressure anti-fuel oil manual trip valve 4, the first high-pressure anti-fuel oil filter 5, the high-pressure anti-fuel oil accumulator 6, the second accumulator 7, the temperature control valve 8, the oil cooler 9, the second high-pressure anti-fuel oil filter 10, the vertical centrifugal oil pump 11, the emergency centrifugal oil pump 12, the lubricating oil pressure regulating valve 14, the second high-pressure anti-fuel oil low-pressure main steam valve oil cylinder 16, the second high-pressure anti-fuel oil low-pressure governor valve oil motor 17 and the third high-pressure anti-fuel oil filter 18, realizing the unified management of power equipment.

[0033] Please refer to Figures 1 - 3 , the working principle of the present invention: The present invention is provided with the first high-pressure anti-fuel oil low-pressure main steam valve oil cylinder 1, the first high-pressure anti-fuel oil low-pressure governor valve oil motor 2 and the high-pressure anti-fuel oil AST trip module. When in use, the external control panel is opened, and the third lubricating oil delivery pipeline 195, the second lubricating oil delivery pipeline 194 and the first lubricating oil delivery pipeline 193 cooperate to assist in connecting each device inside the oil station 15, so as to cooperate with the non-pressure oil discharge main pipeline 115, the pressure oil main pipeline 116 and the pressurized oil discharge main pipeline 117 for connection.

[0034] Through the cooperation of the second anti-fuel oil pipeline 161, the oil inside the second high-pressure anti-fuel oil low-pressure main steam valve oil cylinder 16 is transported into the corresponding anti-fuel oil safety oil main pipeline 111. Through the cooperation of the second non-pressure oil discharge pipeline 162, the oil inside the second high-pressure anti-fuel oil low-pressure main steam valve oil cylinder 16 is transported into the corresponding non-pressure oil discharge main pipeline 115. Through the cooperation of the second pressure oil pipeline 163, the oil inside the second high-pressure anti-fuel oil low-pressure main steam valve oil cylinder 16 is transported into the corresponding pressure oil main pipeline 116. Through the cooperation of the second pressurized oil discharge pipeline 164, the oil inside the second high-pressure anti-fuel oil low-pressure main steam valve oil cylinder 16 is transported into the corresponding pressurized oil discharge main pipeline 117.

[0035] The oil inside the second high-pressure control oil valve actuator 17 of the control oil is transported into the corresponding control oil safety oil main pipeline 111 through the cooperation of the third control oil pipeline 171. The oil inside the second high-pressure control oil valve actuator 17 of the control oil is transported into the corresponding non-pressure drain oil main pipeline 115 through the cooperation of the third non-pressure drain oil pipeline 172. The oil inside the second high-pressure control oil valve actuator 17 of the control oil is transported into the corresponding pressure oil main pipeline 116 through the cooperation of the third pressure oil pipeline 173. The oil inside the second high-pressure control oil valve actuator 17 and the third high-pressure control oil filter 18 of the control oil is transported into the corresponding pressure drain oil main pipeline 117 through the cooperation of the third pressure drain oil pipeline 174.

[0036] The oil inside the first high-pressure control oil low-pressure main steam valve cylinder 1 of the control oil is transported into the corresponding control oil safety oil main pipeline 111 through the cooperation of the first control oil pipeline 118. The oil inside the first high-pressure control oil low-pressure main steam valve cylinder 1 of the control oil is transported into the corresponding non-pressure drain oil main pipeline 115 through the cooperation of the first non-pressure drain oil pipeline 113. The oil inside the first high-pressure control oil low-pressure main steam valve cylinder 1 of the control oil is transported into the corresponding pressure oil main pipeline 116 through the cooperation of the first pressure oil pipeline 119. The oil inside the first high-pressure control oil low-pressure main steam valve cylinder 1 of the control oil is transported into the corresponding pressure drain oil main pipeline 117 through the cooperation of the first pressure drain oil pipeline 114.

[0037] The oil inside the first high-pressure control oil valve actuator 2 of the control oil is transported into the corresponding control oil safety oil main pipeline 111 through the cooperation of the fourth control oil pipeline 21. The oil inside the first high-pressure control oil valve actuator 2 of the control oil is transported into the corresponding non-pressure drain oil main pipeline 115 through the cooperation of the fourth pressure oil pipeline 23. The oil inside the first high-pressure control oil valve actuator 2 and the first high-pressure control oil filter 5 of the control oil is transported into the corresponding pressure oil main pipeline 116 through the cooperation of the fourth pressure drain oil pipeline 24. The oil inside the first high-pressure control oil valve actuator 2 of the control oil is transported into the corresponding pressure drain oil main pipeline 117 through the cooperation of the fourth non-pressure drain oil pipeline 22.

[0038] The limit baffle 206 is used to strengthen the connection between the steam turbine exhaust box 203 and the steam turbine front bearing processing box 205. The steam turbine rear bearing processing box 202 is supported by the first support base 20. The processing table 204 is supported by the second support base 201, thereby improving the stability of the equipment during operation.

[0039] The control panel is used to control the operation of the first high-pressure fire-resistant oil low-pressure main steam valve cylinder 1, the first high-pressure fire-resistant oil low-pressure governing valve oil motor 2, the high-pressure fire-resistant oil manual trip valve 4, the first high-pressure fire-resistant oil filter 5, the high-pressure fire-resistant oil accumulator 6, the second accumulator 7, the temperature control valve 8, the oil cooler 9, the second high-pressure fire-resistant oil filter 10, the vertical centrifugal oil pump 11, the emergency centrifugal oil pump 12, the lubricating oil pressure regulating valve 14, the second high-pressure fire-resistant oil low-pressure main steam valve cylinder 16, the second high-pressure fire-resistant oil low-pressure governing valve oil motor 17 and the third high-pressure fire-resistant oil filter 18, realizing the unified management of power equipment.

[0040] Through the cooperation of multiple groups of non-pressure drain pipes, pressure oil pipes, fire-resistant oil pipes and pressure drain pipes, they are respectively connected to different equipment, which is convenient for the staff to control one by one and improves the intelligent operation level during equipment management.

[0041] During actual operation: 1. Add an internal switching function: The small turbine cylinder body is transformed into independent low-pressure nozzle groups and high-pressure nozzle groups, and a high-pressure hydraulic main steam valve and a high-pressure hydraulic governing valve are added to the system. Ensure that the small turbine can, according to different operating conditions of the large turbine, when the extraction steam from the fourth stage cannot normally drive the feed water pump group, the cold-end steam from the second stage enters through the high-pressure governing valve to make up for the insufficient work, and the two steam flows are mixed after the small turbine adjusts and does work. The specific mixing and switching processes are as follows: When the large turbine is operating in pure condensing conditions: The extraction steam from the fourth stage of the large turbine enters the low-pressure nozzle group to do work after being controlled by the low-pressure governing valve. In this condition, the extraction steam from the fourth stage of the large turbine basically meets the steam consumption conditions of the small turbine. Usually, the high-pressure governing valve is in the closed state and does not supply steam to the small turbine.

[0042] When the large turbine is operating in the heat supply condition (heat supply: 0 - 300 t / h): When the heat supply is very small, the small turbine preferentially uses the extraction steam from the fourth stage of the large turbine. The low-pressure steam enters the low-pressure nozzle group to do work after being controlled by the low-pressure governing valve, meeting the requirements of the feed water pump power and speed in this condition. As the heat supply of the large turbine gradually increases, the pressure at the extraction steam port of the fourth stage of the large turbine continuously decreases and the work capacity of the extraction steam from the fourth stage decreases. The low-pressure governing valve needs to be continuously opened wide to maintain the load of the small turbine to meet the boiler feed water volume. When the low-pressure governing valve is almost fully open and the extraction steam source from the fourth stage still cannot meet the operating needs of the small turbine, at this time, the high-pressure governing valve gradually opens, and the cold-end steam enters the small turbine to do work to make up for the shortage of the low-pressure steam source. The two steam sources are mixed after doing work through the regulating stage. When the large turbine is operating in the large heat supply condition, the low-pressure governing valve is fully open, and the high-pressure governing valve controls the intake steam volume of the cold-end steam of the second stage of the small turbine to meet the power consumption requirements of the feed water pump group; When the heat supply of the large machine gradually decreases, the pressure at the extraction port of the fourth stage continuously increases and the work capacity of the extraction steam of the fourth stage increases. At this time, the high-pressure control valve gradually closes to control the output of the small machine. When the high-pressure control valve is nearly closed, the low-pressure control valve participates in controlling the output of the small steam turbine. Therefore, when the large machine operates under the condition of small extraction steam volume, the high-pressure control valve is fully closed and the load is controlled by the low-pressure control valve.

[0043] 2. Modification of the flow passage structure: Considering that the inlet steam parameters of the small steam turbine are low under the extraction steam condition and the change of the flow passage structure is large, it is necessary to replace the rotor, replace the nozzle of the regulating stage of the upper cylinder, and increase the nozzle of the regulating stage of the lower cylinder. The specific modification contents are as follows: (1) Replace the rotor; (2) Disassemble and process the cylinder, replace the low-pressure nozzle of the regulating stage of the upper cylinder, and increase the high-pressure nozzle of the regulating stage of the lower cylinder; (3) Add two guide baffles in the cylinder to reduce the steam flow friction loss; 3. Other modification contents (1) Newly add a high-pressure hydraulic main steam valve and a regulating valve; (2) Replace the thrust bearing (using ISO VG32 turbine oil) to meet the axial thrust requirement; (3) Modification of the fire-resistant oil pipeline system: Newly add a hydraulic control module to meet the control of the high-pressure hydraulic main steam valve and the hydraulic regulating valve; (4) Modification of the MEH control part, including hardware, programming, and on-site service, mainly adding control hardware and accessories for controlling the high-pressure hydraulic main steam valve and the hydraulic regulating valve and providing control logic; (5) Modification of the DCS, on-site steam and water pipeline modification, and on-site drilling modification of the chassis of the small steam turbine.

[0044] By taking into account both the pure condensing and heat supply conditions of the large machine, the efficiency of the modified small machine decreases slightly, but the principle of this modification is: The small steam turbines are all full-capacity feed water pump turbines, and there is no electric pump in the system. Therefore, ensuring the safe and stable operation at each operating point is the key to the success or failure of this modification; Ensure the output of the small steam turbine at each operating point when the large machine supplies heat from 0 to 300 t / h; Further optimize the flow passage structure, and on the premise of meeting safety and output, try to improve the efficiency of the unit. This modification plan has been confirmed to be safe and reliable through thermal calculation, aerodynamic and strength analysis of the flow passage part, and axial thrust calculation, and can meet the requirements of driving the feed water pump group under the pure condensing and heat supply conditions of the large machine. After the modification, the data writing of the small steam turbine has been checked. The high and low pressure steam consumption in other heat supply conditions is less than that in the single-unit maximum heat supply capacity condition. The newly added high-pressure steam pipeline of the small steam turbine is designed according to the single-unit maximum heat supply capacity condition and fully meets other operating conditions.

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

Claims

1. A flow regulation system for a dual steam source hybrid work of a small steam turbine under heating conditions, including a steam turbine rear bearing processing box (202), characterized in that, It further includes: On one side of the steam turbine rear bearing processing box (202), a steam turbine exhaust box (203) is installed. On the side of the steam turbine exhaust box (203) away from the steam turbine rear bearing processing box (202), a processing table (204) is installed. Inside the processing table (204), a steam turbine front bearing processing box (205) is installed. On one side of the steam turbine front bearing processing box (205), an anti - fuel oil treatment chamber (207) is installed; Inside the anti - fuel oil treatment chamber (207), an anti - fuel oil security oil main pipeline (111), a pressurized drain oil main pipeline (117), a pressure oil main pipeline (116), and a non - pressurized drain oil main pipeline (115) are installed. Between the anti - fuel oil security oil main pipeline (111) and the pressurized drain oil main pipeline (117), a second high - pressure anti - fuel oil low - pressure main steam valve oil cylinder (16), a second high - pressure anti - fuel oil low - pressure regulating valve oil motor (17), a first high - pressure anti - fuel oil low - pressure main steam valve oil cylinder (1), a first high - pressure anti - fuel oil low - pressure regulating valve oil motor (2), a high - pressure anti - fuel oil AST shut - off module (3), and a high - pressure anti - fuel oil manual trip valve (4) are installed. Between the second high - pressure anti - fuel oil low - pressure regulating valve oil motor (17) and the pressurized drain oil main pipeline (117), a third high - pressure anti - fuel oil filter (18) is installed. Between the high - pressure anti - fuel oil AST shut - off module (3) and the pressurized drain oil main pipeline (117), a high - pressure anti - fuel oil accumulator (6) is installed. Between the first high - pressure anti - fuel oil low - pressure regulating valve oil motor (2) and the pressurized drain oil main pipeline (117), a first high - pressure anti - fuel oil filter (5) is installed; Inside the anti - fuel oil treatment chamber (207) and on one side of the anti - fuel oil security oil main pipeline (111), an oil station (15) is installed.

2. The through-flow regulation system for the dual steam source hybrid work of the extraction steam turbine under heating conditions according to claim 1, wherein: Inside the oil station (15), a low - pressure turbine oil mechanism is installed. The low - pressure turbine oil mechanism includes an oil tank (13). Inside the oil station (15), an oil tank (13) is installed. On one side of the oil tank (13), a vertical centrifugal oil pump (11) and an emergency centrifugal oil pump (12) are installed. On one side of the oil tank (13), an oil cooler (9) is installed. On the side of the oil cooler (9) away from the oil tank (13), two second accumulators (7) are installed. On one side of the two second accumulators (7), a second high - pressure anti - fuel oil filter (10) is installed.

3. The flow regulation system for the double steam source hybrid work of the extraction steam turbine under heating conditions according to claim 2, wherein: A third lubricating oil delivery pipeline (195) is installed between the oil cooler (9) and the oil tank (13). A temperature control valve (8) is installed on the outer side of the third lubricating oil delivery pipeline (195) and close to the oil cooler (9). A second lubricating oil delivery pipeline (194) is installed between the temperature control valve (8) and the second high-pressure fire-resistant oil filter (10). One end of the second lubricating oil delivery pipeline (194) extends into the interior of the oil tank (13). A first lubricating oil delivery pipeline (193) is installed on one side of the second high-pressure fire-resistant oil filter (10). A lubricating oil pressure regulating valve (14) is installed on the outer side of the first lubricating oil delivery pipeline (193) and close to the second high-pressure fire-resistant oil filter (10). An oil inlet (192) for each bearing is installed on one side of the first lubricating oil delivery pipeline (193).

4. The flow regulation system for the dual steam source hybrid work of the extraction steam turbine under heating conditions according to claim 3, characterized in that: A second anti-fire-resistant oil pipeline (161) extending into the interior of the anti-fire-resistant oil security oil main pipeline (111) is installed on one side of the second high-pressure fire-resistant oil low-pressure main steam valve oil cylinder (16). A second non-pressure oil discharge pipeline (162) extending into the interior of the non-pressure oil discharge main pipeline (115) is installed on the other side of the second high-pressure fire-resistant oil low-pressure main steam valve oil cylinder (16). A second pressure oil pipeline (163) extending into the interior of the pressure oil main pipeline (116) is installed on the outer side of the second high-pressure fire-resistant oil low-pressure main steam valve oil cylinder (16). A second pressure oil discharge pipeline (164) extending into the interior of the pressure oil discharge main pipeline (117) is installed on the outer side of the second high-pressure fire-resistant oil low-pressure main steam valve oil cylinder (16).

5. The flow regulation system for the dual steam source hybrid work of the extraction steam turbine under heating conditions according to claim 1, characterized in that: A third anti-fire-resistant oil pipeline (171) extending into the interior of the anti-fire-resistant oil security oil main pipeline (111) is installed on one side of the second high-pressure fire-resistant oil low-pressure regulating valve oil motor (17). A third non-pressure oil discharge pipeline (172) extending into the interior of the non-pressure oil discharge main pipeline (115) is installed on the other side of the second high-pressure fire-resistant oil low-pressure regulating valve oil motor (17). A third pressure oil pipeline (173) extending into the interior of the pressure oil main pipeline (116) is installed on the outer side of the second high-pressure fire-resistant oil low-pressure regulating valve oil motor (17). A third pressure oil discharge pipeline (174) passing through the third high-pressure fire-resistant oil filter (18) and extending into the interior of the pressure oil discharge main pipeline (117) is installed on the outer side of the second high-pressure fire-resistant oil low-pressure regulating valve oil motor (17).

6. The flow regulation system for the dual steam source hybrid work of the extraction steam turbine under heating conditions according to claim 4, characterized in that: A first anti-fire-resistant oil pipeline (118) extending into the interior of the anti-fire-resistant oil security oil main pipeline (111) is installed on one side of the first high-pressure fire-resistant oil low-pressure main steam valve oil cylinder (1). A first non-pressure oil discharge pipeline (113) extending into the interior of the non-pressure oil discharge main pipeline (115) is installed on the other side of the first high-pressure fire-resistant oil low-pressure main steam valve oil cylinder (1). A first pressure oil pipeline (119) extending into the interior of the pressure oil main pipeline (116) is installed on the outer side of the first high-pressure fire-resistant oil low-pressure main steam valve oil cylinder (1). A first pressure oil discharge pipeline (114) extending into the interior of the pressure oil discharge main pipeline (117) is installed on the outer side of the first high-pressure fire-resistant oil low-pressure main steam valve oil cylinder (1).

7. The flow regulation system for the dual steam source hybrid work of the extraction steam turbine under heating conditions according to claim 1, characterized in that: On one side of the first high-pressure fire-resistant oil low-pressure regulating valve oil motor (2), a fourth fire-resistant oil pipeline (21) extending into the interior of the fire-resistant oil security oil main pipeline (111) is installed. On the other side of the first high-pressure fire-resistant oil low-pressure regulating valve oil motor (2), a fourth pressure oil pipeline (23) extending into the interior of the non-pressure oil discharge main pipeline (115) is installed. On the outer side of the first high-pressure fire-resistant oil low-pressure regulating valve oil motor (2), a fourth pressurized oil discharge pipeline (24) passing through the first high-pressure fire-resistant oil filter (5) and extending into the interior of the pressure oil main pipeline (116) is installed. On the outer side of the first high-pressure fire-resistant oil low-pressure regulating valve oil motor (2), a fourth non-pressure oil discharge pipeline (22) extending into the interior of the pressurized oil discharge main pipeline (117) is installed.

8. The flow regulation system for the dual steam source hybrid work of the extraction steam turbine under heating conditions according to claim 6, characterized in that: On one side of the high-pressure fire-resistant oil AST shut-off module (3), a fifth fire-resistant oil pipeline (31) extending into the interior of the fire-resistant oil security oil main pipeline (111) is installed. On the other side of the high-pressure fire-resistant oil AST shut-off module (3), a conveying main pipeline (19) sequentially passing through the pressurized oil discharge main pipeline (117), the pressure oil main pipeline (116), and the non-pressure oil discharge main pipeline (115) is installed. On one side of the high-pressure fire-resistant manual trip valve (4), a connecting pipeline (112) is installed. One end of the connecting pipeline (112) is connected to the fire-resistant oil security oil main pipeline (111), and the other end of the connecting pipeline (112) is connected to the conveying main pipeline (19). On one side of the high-pressure fire-resistant accumulator (6), a fifth pressure oil pipeline (62) extending into the interior of the pressure oil main pipeline (116) is installed. On both sides of the fifth pressure oil pipeline (62), fifth non-pressure oil discharge pipelines (61) are installed, and both of the two fifth non-pressure oil discharge pipelines (61) are connected to the non-pressure oil discharge main pipeline (115).

9. The steam flow regulating system for the double-steam-source hybrid work of the extraction steam turbine under heating conditions according to claim 8, wherein: The bottom of the processing table (204) is fixedly connected to a second support base (201). The bottom of the steam turbine rear bearing processing box (202) is fixedly connected to a first support base (20). The outer sides of the steam turbine exhaust box (203) and the steam turbine front bearing processing box (205) are provided with limit baffles (206).

10. The flow regulation system for the dual steam source hybrid work of the extraction steam turbine under heating conditions according to claim 9, characterized in that: A control panel is installed on the outer side of the steam turbine exhaust box (203). The first high-pressure fire-resistant oil low-pressure main steam valve oil cylinder (1), the first high-pressure fire-resistant oil low-pressure regulating valve oil motor (2), the high-pressure fire-resistant manual trip valve (4), the first high-pressure fire-resistant oil filter (5), the high-pressure fire-resistant accumulator (6), the second accumulator (7), the temperature control valve (8), the oil cooler (9), the second high-pressure fire-resistant oil filter (10), the vertical centrifugal oil pump (11), the emergency centrifugal oil pump (12), the lubricating oil pressure regulating valve (14), the second high-pressure fire-resistant oil low-pressure main steam valve oil cylinder (16), the second high-pressure fire-resistant oil low-pressure regulating valve oil motor (17), and the third high-pressure fire-resistant oil filter (18) are all electrically connected to the control panel.

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