Feed pump turbine steam matching system and control method thereof

Abstract

The invention discloses a feed pump turbine steam matching system and a control method thereof. The feed pump turbine steam matching system comprises a high-pressure cylinder, an intermediate-pressure cylinder, a reheater, a feed pump turbine, a pressure matcher and a fifth pipeline, and a four-section steam extraction opening of the intermediate-pressure cylinder is connected with the feed pump turbine through a first pipeline; a high-pressure inlet of the pressure matcher is connected with a steam exhaust port of the high-pressure cylinder through a second pipeline, a low-pressure inlet of the pressure matcher is connected with the first pipeline through a third pipeline, and a pressure outlet of the pressure matcher is connected with the first pipeline through a fourth pipeline. The connecting position of the third pipeline and the first pipeline is arranged at the upstream of the connecting position of the fourth pipeline and the first pipeline; the fifth pipeline is connected with a steam exhaust port of the high-pressure cylinder and the fourth pipeline and connected with the pressure matcher in parallel. According to the steam matching system of the water-feeding pump turbine, the requirement for the high steam amount of the water-feeding pump turbine is met when the water-feeding pump turbine is in the deep peak regulation working condition.

Description

Technical Field

[0001] The present invention relates to the technical field of steam turbines and steam systems, and in particular, to a steam matching system for a boiler feed pump turbine and a control method therefor. Background Art

[0002] Due to the randomness and instability of new energy power generation, coal-fired power generation units are forced to participate in deep peak shaving comprehensively, and some coal-fired units need to be deep peak-shaved to 30% of the rated load or even 20% of the rated load. As the unit load decreases, the extraction steam pressure of each stage of the steam turbine decreases, and the extraction steam from the fourth stage of the intermediate pressure cylinder cannot meet the requirements of the boiler feed pump turbine under deep peak shaving conditions. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a steam matching system for a boiler feed pump turbine, and the steam matching system for a boiler feed pump turbine can meet the higher steam demand of the boiler feed pump turbine under deep peak shaving conditions.

[0004] The present invention also provides a control method for a steam matching system for a boiler feed pump turbine, and the control method for a steam matching system for a boiler feed pump turbine uses the above-mentioned steam matching system for a boiler feed pump turbine.

[0005] According to an embodiment of the present invention, a steam matching system for a boiler feed pump turbine includes a high-pressure cylinder, an intermediate-pressure cylinder, a reheater, a boiler feed pump turbine, a pressure matcher, and a fifth pipeline. The exhaust port of the high-pressure cylinder is connected to the inlet of the reheater, and the exhaust port of the reheater is connected to the inlet of the intermediate-pressure cylinder. The extraction steam port of the fourth stage of the intermediate-pressure cylinder is connected to the boiler feed pump turbine through a first pipeline. The pressure matcher has a high-pressure inlet, a low-pressure inlet, and a pressure outlet. The high-pressure inlet is connected to the exhaust port of the high-pressure cylinder through a second pipeline. The low-pressure inlet of the pressure matcher is connected to the first pipeline through a third pipeline. The pressure outlet of the pressure matcher is connected to the first pipeline through a fourth pipeline. Among them, the connection position of the third pipeline and the first pipeline is located upstream of the connection position of the fourth pipeline and the first pipeline. The fifth pipeline is connected to both the exhaust port of the high-pressure cylinder and the fourth pipeline and is in parallel with the pressure matcher.

[0006] According to the steam matching system of the feed water pump steam turbine according to the embodiments of the present invention, by connecting the intermediate pressure cylinder to the feed water pump steam turbine, the high-pressure inlet of the pressure matcher is connected to the high-pressure cylinder, the low-pressure inlet of the pressure matcher is connected to the intermediate pressure cylinder, and the pressure outlet of the pressure matcher is connected to the feed water pump steam turbine. The pressure matcher can match and regulate the high-pressure steam source of the high-pressure cylinder and the low-pressure steam source of the intermediate pressure cylinder, mix the steam and then transport it to the feed water pump steam turbine to realize the operation of the feed water pump steam turbine, and meet the higher steam volume demand of the feed water pump steam turbine when the feed water pump steam turbine is in the deep peak shaving working condition. The fifth pipeline is connected to both the exhaust port of the high-pressure cylinder and the fourth pipeline and is in parallel with the pressure matcher, which can realize the connection between the high-pressure cylinder and the feed water pump steam turbine when the pressure matcher fails. When the feed water pump steam turbine is in the deep peak shaving working condition, even if the pressure matcher fails, the steam volume demand of the feed water pump steam turbine can still be met, ensuring the stable operation of the steam matching system of the feed water pump steam turbine.

[0007] In addition, the steam matching system of the feed water pump steam turbine according to the present invention may further have the following additional technical features:

[0008] In some embodiments of the present invention, a first electric isolation valve is provided on the second pipeline for opening or closing the second pipeline; and / or, a first check valve is provided on the second pipeline for controlling the steam in the second pipeline to only flow from the exhaust port of the high-pressure cylinder to the high-pressure inlet; and / or, a first electric control valve is provided on the second pipeline for controlling the flow rate of the second pipeline; and / or, a first manual isolation valve is provided on the second pipeline for manually opening or closing the second pipeline.

[0009] In some embodiments of the present invention, the steam matching system of the feed water pump steam turbine further includes a bypass valve. A first electric control valve is provided on the second pipeline, and the bypass valve is in parallel with the first electric control valve for isolating the first electric control valve during maintenance.

[0010] In some embodiments of the present invention, a second electric isolation valve is provided on the second pipeline for opening or closing the second pipeline, and the inlet of the fifth pipeline is provided upstream of the second electric isolation valve.

[0011] In some embodiments of the present invention, a third electric isolation valve is provided on the fifth pipeline for opening or closing the fifth pipeline; and / or, a second manual isolation valve is provided on the fifth pipeline for manually opening or closing the fifth pipeline; and / or, a fourth electric isolation valve is provided on the third pipeline for opening or closing the third pipeline.

[0012] In some embodiments of the present invention, the steam matching system of the feed water pump steam turbine further includes an orifice plate, and the orifice plate is provided on the first pipeline and downstream of the fourth pipeline.

[0013] In some embodiments of the present invention, a fifth electric isolation valve is provided on the first pipeline, and the fifth electric isolation valve is arranged between the connection point of the first pipeline and the third pipeline and the connection point of the first pipeline and the fourth pipeline for opening or closing the first pipeline; and / or, a second check valve is provided on the first pipeline, and the second check valve is arranged between the connection point of the first pipeline and the third pipeline and the connection point of the first pipeline and the fourth pipeline for controlling the steam in the first pipeline to only flow from the extraction port of the fourth stage of the intermediate pressure cylinder to the low-pressure inlet.

[0014] In some embodiments of the present invention, the steam matching system of the feed water pump steam turbine further includes: a drain flash tank, the drain flash tank is communicated with the second pipeline, and a third manual isolation valve and a hydraulic isolation valve are provided upstream of the drain flash tank; and / or, the steam matching system of the feed water pump steam turbine further includes: an auxiliary steam header, the auxiliary steam header is communicated with the exhaust port of the high-pressure cylinder and the extraction port of the fourth stage of the intermediate pressure cylinder, and the auxiliary steam header is connected to the feed water pump steam turbine.

[0015] According to the control method of the steam matching system of the feed water pump steam turbine according to the embodiment of the present invention, using the above steam matching system of the feed water pump steam turbine, the control method of the steam matching system of the feed water pump steam turbine includes: confirming the working state of the feed water pump steam turbine; adjusting the on-off of the pipeline of the steam matching system of the feed water pump steam turbine.

[0016] According to the control method of the steam matching system of the feed water pump steam turbine according to the embodiment of the present invention, by connecting the intermediate pressure cylinder to the feed water pump steam turbine, connecting the high-pressure inlet of the pressure matcher to the high-pressure cylinder, connecting the low-pressure inlet of the pressure matcher to the intermediate pressure cylinder, and connecting the pressure outlet of the pressure matcher to the feed water pump steam turbine, the pressure matcher can match and adjust the high-pressure steam source of the high-pressure cylinder and the low-pressure steam source of the intermediate pressure cylinder, and mix and transport the steam to the feed water pump steam turbine to realize the operation of the feed water pump steam turbine, and meet the higher steam demand of the feed water pump steam turbine when the feed water pump steam turbine is in the deep peak shaving working condition. The fifth pipeline is connected to both the exhaust port of the high-pressure cylinder and the fourth pipeline and is in parallel with the pressure matcher, which can realize the connection between the high-pressure cylinder and the feed water pump steam turbine when the pressure matcher fails. When the feed water pump steam turbine is in the deep peak shaving working condition, even if the pressure matcher fails, the steam demand of the feed water pump steam turbine can still be met, ensuring the stable operation of the steam matching system of the feed water pump steam turbine.

[0017] In some embodiments of the present invention, the operating state of the feed water pump steam turbine is the standard operating condition. The on-off control of the pipeline of the feed water pump steam turbine steam matching system includes: opening the first pipeline and closing the second pipeline, the third pipeline, the fourth pipeline, and the fifth pipeline; and / or, when the operating state of the feed water pump steam turbine is the deep peak shaving operating condition, the on-off control of the pipeline of the feed water pump steam turbine steam matching system includes: opening the first pipeline, the second pipeline, the third pipeline, and the fourth pipeline, and closing the fifth pipeline; and / or, when the operating state of the feed water pump steam turbine is the deep peak shaving operating condition and the pressure matcher fails, the on-off control of the pipeline of the feed water pump steam turbine steam matching system includes: opening the first pipeline and the fifth pipeline; closing the second pipeline, the third pipeline, and the fourth pipeline.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 is a schematic diagram of a feed water pump steam turbine steam matching system according to an embodiment of the present invention.

[0021] REFERENCE SIGNS

[0022] 100, feed water pump steam turbine steam matching system;

[0023] 1, high-pressure cylinder; 11, fourth check valve; 12, eighth electric isolation valve;

[0024] 2, intermediate-pressure cylinder; 21, extraction port of the fourth stage steam;

[0025] 3, reheater;

[0026] 4, pressure matcher; 41, high-pressure inlet; 411, second pipeline; 4111, first electric isolation valve; 4112, first check valve; 4113, first electric control valve; 4114, first manual isolation valve; 4115, bypass valve; 4116, second electric isolation valve; 42, low-pressure inlet; 421, third pipeline; 4211, fourth electric isolation valve; 43, pressure outlet; 431, fourth pipeline;

[0027] 5. Feed water turbine; 51. First pipeline; 511. Fifth electric isolation valve; 512. Second check valve; 513. Fifth check valve; 514. Ninth electric isolation valve; 515. Tenth electric isolation valve; 516. Fourth manual isolation valve; 517. Eleventh electric isolation valve; 518. Sixth check valve; 519. Fifth manual isolation valve; 520. Low-pressure inlet steam regulating valve;

[0028] 6. Drainage expansion vessel; 61. Third manual isolation valve; 62. Hydraulic isolation valve;

[0029] 7. Auxiliary steam header; 71. Sixth electric isolation valve; 72. Third check valve; 73. Sixth manual isolation valve; 74. Second electric regulating valve; 75. Seventh electric isolation valve;

[0030] 8. Fifth pipeline; 81. Third electric isolation valve; 82. Second manual isolation valve;

[0031] 9. Flow orifice plate; 10. High-pressure heater; 101. Deaerator. Detailed implementation manners

[0032] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention.

[0034] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0035] In the present invention, unless otherwise clearly specified and defined, terms such as "installation", "connection", "linkage", "fixation" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one; it may be a mechanical connection, an electrical connection, or a communication connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] The steam matching system 100 of a feed water pump steam turbine according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0037] As Figure 1 shown, the steam matching system 100 of a feed water pump steam turbine according to an embodiment of the present invention includes a high-pressure cylinder 1, an intermediate-pressure cylinder 2, a reheater 3, a feed water pump steam turbine 5, a pressure matcher 4, and a fifth pipeline 8.

[0038] Specifically, as Figure 1 shown, the exhaust port of the high-pressure cylinder 1 is connected to the steam inlet of the reheater 3, and the exhaust port of the reheater 3 is connected to the steam inlet of the intermediate-pressure cylinder 2. The reheater 3 is used to heat the high-pressure exhaust steam discharged from the high-pressure cylinder 1. After being heated by the reheater 3, the high-pressure exhaust steam is sent to the intermediate-pressure cylinder 2 to do work, which can maximize the utilization rate of steam energy and thus improve the efficiency of the entire system.

[0039] Furthermore, as Figure 1 shown, the fourth extraction port 21 of the intermediate-pressure cylinder 2 is connected to the feed water pump steam turbine 5 through a first pipeline 51. The intermediate-pressure cylinder 2 can directly provide a steam source for the feed water pump steam turbine 5 to realize the operation of the feed water pump steam turbine 5.

[0040] Even further, as Figure 1As shown in the figure, the pressure matcher 4 is provided with a high-pressure inlet 41, a low-pressure inlet 42 and a pressure outlet 43. The high-pressure inlet 41 is connected to the exhaust port of the high-pressure cylinder 1 through a second pipeline 411. The high-pressure cylinder 1 can serve as the high-pressure steam source of the pressure matcher 4. The low-pressure inlet 42 of the pressure matcher 4 is connected to the first pipeline 51 through a third pipeline 421, so as to realize the connection between the pressure matcher 4 and the extraction port 21 of the fourth stage of the intermediate-pressure cylinder 2. The intermediate-pressure cylinder 2 can serve as the low-pressure steam source of the pressure matcher 4. The pressure outlet 43 of the pressure matcher 4 is connected to the first pipeline 51 through a fourth pipeline 431. The pressure matcher 4 can match and regulate the high-pressure steam source of the high-pressure cylinder 1 and the low-pressure steam source of the intermediate-pressure cylinder 2, mix the steam and then enter the first pipeline 51, and transport the steam along the first pipeline 51 to the feed water pump steam turbine 5, so as to provide a steam source for the feed water pump steam turbine 5, realize the operation of the feed water pump steam turbine 5, and the steam volume is higher than the steam volume input into the feed water pump steam turbine 5 only from the first pipeline 51, and meet the steam volume requirement of the feed water pump steam turbine 5 when the feed water pump steam turbine 5 is in the deep peak shaving working condition.

[0041] Among them, as Figure 1 shown, the connection position of the third pipeline 421 and the first pipeline 51 is located upstream of the connection position of the fourth pipeline 431 and the first pipeline 51. The steam in the first pipeline 51 enters the third pipeline 421 and then enters the pressure matcher 4 through the low-pressure inlet 42, is adjusted and then enters the fourth pipeline 431 from the pressure outlet 43, and then enters the first pipeline 51, ensuring the steam volume entering the pressure matcher 4 through the low-pressure inlet 42 and ensuring the mixing and matching effect of the pressure matcher 4.

[0042] In addition, as Figure 1 shown, the fifth pipeline 8 is connected to both the exhaust port of the high-pressure cylinder 1 and the fourth pipeline 431 and is in parallel with the pressure matcher 4, which can realize the connection between the high-pressure cylinder 1 and the feed water pump steam turbine 5 when the pressure matcher 4 fails, and can serve as the standby steam source of the feed water pump steam turbine 5. When the feed water pump steam turbine 5 is in the deep peak shaving working condition, even if the pressure matcher 4 fails, the steam volume requirement of the feed water pump steam turbine 5 can still be met, ensuring the stable operation of the feed water pump steam turbine steam matching system 100.

[0043] According to the steam matching system 100 of the feed water pump steam turbine according to the embodiments of the present invention, by connecting the intermediate pressure cylinder 2 with the feed water pump steam turbine 5, the high-pressure inlet 41 of the pressure matcher 4 is connected with the high-pressure cylinder 1, the low-pressure inlet 42 of the pressure matcher 4 is connected with the intermediate pressure cylinder 2, and the pressure outlet 43 of the pressure matcher 4 is connected with the feed water pump steam turbine 5. The pressure matcher 4 can match and regulate the high-pressure steam source of the high-pressure cylinder 1 and the low-pressure steam source of the intermediate pressure cylinder 2, mix the steam and then transport it to the feed water pump steam turbine 5 to realize the operation of the feed water pump steam turbine 5, and meet the higher steam quantity requirement of the feed water pump steam turbine 5 when the feed water pump steam turbine 5 is in the deep peak shaving working condition. The fifth pipeline 8 is connected with both the exhaust port of the high-pressure cylinder 1 and the fourth pipeline 431 and is in parallel with the pressure matcher 4, which can realize the connection between the high-pressure cylinder 1 and the feed water pump steam turbine 5 when the pressure matcher 4 fails. When the feed water pump steam turbine 5 is in the deep peak shaving working condition, even if the pressure matcher 4 fails, the steam quantity requirement of the feed water pump steam turbine 5 can still be met, ensuring the stable operation of the steam matching system 100 of the feed water pump steam turbine.

[0044] In some embodiments of the present invention, as Figure 1 shown, a first electric isolation valve 4111 is provided on the second pipeline 411 for opening or closing the second pipeline 411. The first electric isolation valve 4111 can be remotely controlled and automatically operated through an electric actuator to realize the opening or closing of the second pipeline 411, improving the operation efficiency and safety of the second pipeline 411.

[0045] In some embodiments of the present invention, as Figure 1 shown, a first check valve 4112 is provided on the second pipeline 411 for controlling that the steam in the second pipeline 411 can only flow from the exhaust port of the high-pressure cylinder 1 to the high-pressure inlet 41, which can ensure that the steam in the second pipeline 411 flows in a fixed direction from the exhaust port of the high-pressure cylinder 1 to the high-pressure inlet 41, avoiding the reduction of the efficiency of the steam matching system 100 of the feed water pump steam turbine caused by the reverse flow of steam on the second pipeline 411 and ensuring the working efficiency of the feed water pump steam turbine 5.

[0046] In some embodiments of the present invention, as Figure 1 shown, a first manual isolation valve 4114 is provided on the second pipeline 411 for manually opening or closing the second pipeline 411. The opening or closing of the second pipeline 411 can be ensured by manually adjusting the first manual isolation valve 4114, which can increase the reliability of the opening or closing of the second pipeline 411.

[0047] In some embodiments of the present invention, as Figure 1As shown, a first electric control valve 4113 is provided on the second pipeline 411 for controlling the flow rate of the second pipeline 411. The flow rate of the second pipeline 411 can be adjusted according to the steam demand of the feed water pump steam turbine 5 and the operating state of the pressure matcher 4, improving the operating efficiency of the feed water pump steam turbine steam matching system 100.

[0048] Furthermore, as Figure 1 shown, the feed water pump steam turbine steam matching system 100 further includes a bypass valve 4115. A first electric control valve 4113 is provided on the second pipeline 411. The bypass valve 4115 is connected in parallel with the first electric control valve 4113 and is used for isolating the first electric control valve 4113 during maintenance. When the first electric control valve 4113 fails or needs to be maintained, the steam in the second pipeline 411 can bypass the first electric control valve 4113 through the bypass valve 4115 and continue to flow to the feed water pump steam turbine 5. The first electric control valve 4113 can be isolated during maintenance without shutting down the machine, reducing the shutdown risk of the feed water pump steam turbine steam matching system 100. At the same time, the bypass valve 4115 can also adjust the flow rate of the second pipeline 411 according to the steam demand of the feed water pump steam turbine 5 and the operating state of the pressure matcher 4, improving the operating efficiency of the feed water pump steam turbine steam matching system 100.

[0049] In some embodiments of the present invention, as Figure 1 shown, a second electric isolation valve 4116 is provided on the second pipeline 411 for opening or closing the second pipeline 411. The second electric isolation valve 4116 can be remotely controlled and automatically operated through an electric actuator to open or close the second pipeline 411, improving the operating efficiency and safety of the second pipeline 411. The inlet of the fifth pipeline 8 is provided upstream of the second electric isolation valve 4116. When the pressure matcher 4 fails, the second electric isolation valve 4116 can prevent steam from continuing to flow to the high-pressure inlet of the pressure matcher 4, and at the same time, avoid affecting the flow of steam in the fifth pipeline 8, ensuring the stable operation of the feed water pump steam turbine steam matching system 100.

[0050] In some embodiments of the present invention, as Figure 1 shown, a third electric isolation valve 81 is provided on the fifth pipeline 8 for opening or closing the fifth pipeline 8. The third electric isolation valve 81 can be remotely controlled and automatically operated through an electric actuator to open or close the fifth pipeline 8, improving the operating efficiency and safety of the fifth pipeline 8.

[0051] In some embodiments of the present invention, as Figure 1 shown, a second manual isolation valve 82 is provided on the fifth pipeline 8 for manually opening or closing the fifth pipeline 8. The second manual isolation valve 82 can be manually adjusted to ensure the opening or closing of the fifth pipeline 8, increasing the reliability of the opening or closing of the fifth pipeline 8.

[0052] In some embodiments of the present invention, as Figure 1 shown, a fourth electric isolation valve 4211 is provided on the third pipeline 421 for opening or closing the third pipeline 421. The fourth electric isolation valve 4211 can be remotely controlled and automatically operated through an electric actuator to open or close the third pipeline 421, improving the operating efficiency and safety of the third pipeline 421.

[0053] In some embodiments of the present invention, as Figure 1 shown, the steam matching system 100 of the feed water pump steam turbine further includes an orifice plate 9. The orifice plate 9 is provided on the first pipeline 51 and downstream of the fourth pipeline 431, and can monitor the steam inlet flow rate of the feed water pump steam turbine 5. The opening or closing of the first pipeline 51, the second pipeline 411, the third pipeline 421, the fourth pipeline 431, and the fifth pipeline 8 can be adjusted according to the monitoring result of the orifice plate 9; the flow rates of the first pipeline 51, the second pipeline 411, the third pipeline 421, the fourth pipeline 431, and the fifth pipeline 8 can be adjusted according to the monitoring result of the orifice plate 9, improving the working efficiency of the steam matching system 100 of the feed water pump steam turbine.

[0054] In some embodiments of the present invention, as Figure 1 shown, a fifth electric isolation valve 511 is provided on the first pipeline 51. The fifth electric isolation valve 511 is provided between the connection points of the first pipeline 51 and the third pipeline 421 and the connection points of the first pipeline 51 and the fourth pipeline 431 for opening or closing the first pipeline 51. The fifth electric isolation valve 511 can be remotely controlled and automatically operated through an electric actuator to open or close the first pipeline 51, improving the operating efficiency and safety of the first pipeline 51.

[0055] Meanwhile, the fifth electric isolation valve 511 can control whether all the low-pressure steam flowing out of the intermediate pressure cylinder 2 in the first pipeline 51 flows into the third flow path to meet the working requirements of the feed water pump steam turbine 5.

[0056] In some embodiments of the present invention, as Figure 1As shown, a second check valve 512 is provided on the first pipeline 51. The second check valve 512 is provided between the connection points of the first pipeline 51 and the third pipeline 421 and the connection points of the first pipeline 51 and the fourth pipeline 431, and is used to control that the steam in the first pipeline 51 can only flow from the four-stage extraction port 21 of the intermediate-pressure cylinder 2 to the low-pressure inlet 42. This can ensure that the steam in the first pipeline 51 flows in a fixed direction from the four-stage extraction port 21 of the intermediate-pressure cylinder 2 to the low-pressure inlet 42, avoid the reverse flow of the steam flowing from the fourth pipeline 431 and / or the fifth pipeline 8 to the feedwater turbine 5, and avoid the reduction in the efficiency of the feedwater turbine steam matching system 100 caused by the reverse flow of steam on the first pipeline 51, thereby ensuring the working efficiency of the feedwater turbine 5.

[0057] In some embodiments of the present invention, as Figure 1 shown, the feedwater turbine steam matching system 100 further includes a drain flash tank 6. The drain flash tank 6 is communicated with the second pipeline 411, and a third manual isolation valve 61 and a hydraulic isolation valve 62 are provided upstream of the drain flash tank 6. The drain flash tank 6 can separate steam and drain water, and perform corresponding heat energy recovery and reuse, which helps to improve the heat energy utilization efficiency of the feedwater turbine steam matching system 100 and reduce energy waste. The third manual isolation valve 61 and the hydraulic isolation valve 62 can control whether steam enters the drain flash tank 6, and can select whether steam enters the drain flash tank 6 according to the working state of the feedwater turbine steam matching system 100 to meet the working requirements of the feedwater turbine steam matching system 100.

[0058] In some embodiments of the present invention, as Figure 1 shown, the feedwater turbine steam matching system 100 further includes an auxiliary steam header 7. The auxiliary steam header 7 is communicated with both the exhaust port of the high-pressure cylinder 1 and the four-stage extraction port 21 of the intermediate-pressure cylinder 2, and the auxiliary steam header 7 is connected to the feedwater turbine 5. Part of the steam flowing out from the four-stage extraction port 21 of the intermediate-pressure cylinder 2 enters the auxiliary steam header 7 for storage, and part of the steam flowing out from the steam outlet of the high-pressure cylinder 1 flows into the auxiliary steam header 7, which can maintain the pressure stability of the auxiliary steam header 7. In an emergency, the auxiliary steam header 7 can directly supply steam to the feedwater turbine 5 as a standby steam source for the feedwater turbine 5.

[0059] In some embodiments of the present invention, as Figure 1 shown, a sixth electric isolation valve 71 is provided on the pipeline between the auxiliary steam header 7 and the feedwater turbine 5, and is used to open or close the pipeline between the auxiliary steam header 7 and the feedwater turbine 5. The sixth electric isolation valve 71 can be remotely controlled and automatically operated through an electric actuator to open or close the pipeline between the auxiliary steam header 7 and the feedwater turbine 5, improving the operating efficiency and safety of the pipeline between the auxiliary steam header 7 and the feedwater turbine 5.

[0060] In some embodiments of the present invention, as Figure 1 shown, a third check valve 72 is provided on the pipeline between the auxiliary steam header 7 and the boiler feed pump turbine 5, which is used to control the steam in the pipeline between the auxiliary steam header 7 and the boiler feed pump turbine 5 to only flow from the auxiliary steam header 7 to the boiler feed pump turbine 5, so as to ensure that the steam in the pipeline between the auxiliary steam header 7 and the boiler feed pump turbine 5 flows in a fixed direction from the auxiliary steam header 7 to the boiler feed pump turbine 5, avoid the reduction of the efficiency of the steam matching system 100 of the boiler feed pump turbine caused by the reverse flow of steam on the pipeline between the auxiliary steam header 7 and the boiler feed pump turbine 5, and ensure the working efficiency of the boiler feed pump turbine 5.

[0061] In some embodiments of the present invention, as Figure 1 shown, a sixth manual isolation valve 73 is provided on the pipeline between the auxiliary steam header 7 and the boiler feed pump turbine 5, which is used to manually open or close the pipeline between the auxiliary steam header 7 and the boiler feed pump turbine 5. The opening or closing of the pipeline between the auxiliary steam header 7 and the boiler feed pump turbine 5 can be ensured by manually adjusting the first manual isolation valve 4114, which can increase the reliability of the opening or closing of the pipeline between the auxiliary steam header 7 and the boiler feed pump turbine 5.

[0062] In some embodiments of the present invention, as Figure 1 shown, a second electric control valve 74 is provided on the pipeline between the auxiliary steam header 7 and the boiler feed pump turbine 5, which is used to control the flow rate of the pipeline between the auxiliary steam header 7 and the boiler feed pump turbine 5. The flow rate of the pipeline between the auxiliary steam header 7 and the boiler feed pump turbine 5 can be adjusted according to the steam demand of the boiler feed pump turbine 5, so as to improve the working efficiency of the steam matching system 100 of the boiler feed pump turbine.

[0063] Furthermore, as Figure 1 shown, the steam matching system 100 of the boiler feed pump turbine further includes a seventh electric isolation valve 75, and the seventh electric isolation valve 75 is connected in parallel with the second electric control valve 74 and is used for maintenance isolation of the second electric control valve 74. When the second electric control valve 74 fails or is under maintenance, the steam in the pipeline between the auxiliary steam header 7 and the boiler feed pump turbine 5 can flow around the second electric control valve 74 through the seventh electric isolation valve 75 and continue to flow to the boiler feed pump turbine 5, so that the second electric control valve 74 can be maintained and isolated without shutting down the machine, reducing the shutdown risk of the steam matching system 100 of the boiler feed pump turbine.

[0064] In some embodiments of the present invention, as Figure 1As shown, a fourth check valve 11 and an eighth motorized isolation valve 12 are provided on the pipeline between the high-pressure cylinder 1 and the reheater 3. The fourth check valve 11 and the eighth motorized isolation valve 12 are provided upstream of the high-pressure inlet 41, and can control whether the exhaust port of the high-pressure cylinder 1 discharges steam to the reheater 3 and the pressure matching device 4, and can prevent the steam discharged from the exhaust port of the high-pressure cylinder 1 from flowing back to the high-pressure cylinder 1, so as to avoid affecting the pressure of the high-pressure cylinder 1.

[0065] Among them, the fourth check valve 11 is a pneumatic check valve.

[0066] In some embodiments of the present invention, as Figure 1 shown, a fifth check valve 513 and a ninth motorized isolation valve 514 are provided on the first pipeline 51. The fifth check valve 513 and the ninth motorized isolation valve 514 are provided between the auxiliary steam header 7 and the intermediate-pressure cylinder 2 and between the low-pressure inlet 42 and the intermediate-pressure cylinder 2, and can control whether the extraction port 21 of the fourth stage of the intermediate-pressure cylinder 2 discharges steam to the pressure matching device 4, and can prevent the steam discharged from the exhaust port of the intermediate-pressure cylinder 2 from flowing back to the intermediate-pressure cylinder 2, so as to avoid affecting the pressure of the intermediate-pressure cylinder 2.

[0067] Among them, the fifth check valve 513 is a pneumatic check valve.

[0068] In some embodiments of the present invention, as Figure 1 shown, a tenth motorized isolation valve 515 and a fourth manual isolation valve 516 are provided on the first pipeline 51. The tenth motorized isolation valve 515 and the fourth manual isolation valve 516 are provided upstream of the inlet of the third pipeline 421 and are used to open or close the first pipeline 51.

[0069] In some embodiments of the present invention, as Figure 1 shown, an eleventh motorized isolation valve 517 and a sixth check valve 518 are provided on the first pipeline 51. The eleventh motorized isolation valve 517 and the sixth check valve 518 are provided downstream of the outlets of the fourth pipeline 431 and the sixth pipeline, and are used to open or close the first pipeline 51. It can also prevent the steam in the first pipeline 51 from flowing reversely towards the fourth pipeline 431 and the sixth pipeline, so as to avoid affecting the steam flow efficiency of the fourth pipeline 431 and the sixth pipeline.

[0070] In some embodiments of the present invention, as Figure 1 shown, a fifth manual isolation valve 519 and a low-pressure steam inlet regulating valve 520 are provided on the first pipeline 51. The fifth manual isolation valve 519 and the low-pressure steam inlet regulating valve 520 are arranged close to the feed water pump steam turbine 5. The fifth manual isolation valve 519 is used to close the first pipeline 51, and the low-pressure steam inlet regulating valve 520 is used to adjust the steam pressure entering the feed water pump steam turbine 5 to meet the normal working requirements of the feed water pump steam turbine 5.

[0071] In some embodiments of the present invention, as Figure 1As shown, the steam matching system 100 of the feed water pump steam turbine further includes a high-pressure heater 10. The high-pressure heater 10 is connected to the second pipeline 411 and is arranged upstream of the auxiliary steam header 7, the reheater 3, and the pressure matcher 4, and is used to heat the steam flowing out of the exhaust port of the first stage of the high-pressure cylinder 1.

[0072] In some embodiments of the present invention, as Figure 1 shown, the steam matching system 100 of the feed water pump steam turbine further includes a deaerator 101. The deaerator 101 can effectively remove dissolved oxygen and other gases in the water, avoiding affecting the physical properties and chemical reactions of the steam.

[0073] The control method of the steam matching system of the feed water pump steam turbine according to the embodiments of the present invention will be described below with reference to the accompanying drawings.

[0074] The control method of the steam matching system of the feed water pump steam turbine according to the embodiments of the present invention uses the above-mentioned steam matching system 100 of the feed water pump steam turbine.

[0075] Specifically, the control method of the steam matching system of the feed water pump steam turbine includes:

[0076] Confirm the working state of the feed water pump steam turbine 5, facilitate confirming the working requirements of the feed water pump steam turbine 5, and integrally calculate the required steam volume, etc. to achieve the working requirements of the feed water pump steam turbine 5;

[0077] Adjust the on-off of the pipeline of the steam matching system 100 of the feed water pump steam turbine, and further adjust the steam volume entering the feed water pump steam turbine 5.

[0078] According to the control method of the steam matching system of the feed water pump steam turbine according to the embodiments of the present invention, by connecting the intermediate-pressure cylinder 2 to the feed water pump steam turbine 5, connecting the high-pressure inlet 41 of the pressure matcher 4 to the high-pressure cylinder 1, connecting the low-pressure inlet 42 of the pressure matcher 4 to the intermediate-pressure cylinder 2, and connecting the pressure outlet 43 of the pressure matcher 4 to the feed water pump steam turbine 5, the pressure matcher 4 can match and adjust the high-pressure steam source of the high-pressure cylinder 1 and the low-pressure steam source of the intermediate-pressure cylinder 2, mix the steam and then transport it to the feed water pump steam turbine 5 to realize the operation of the feed water pump steam turbine 5, and meet the higher steam volume requirements of the feed water pump steam turbine 5 when the feed water pump steam turbine 5 is in the deep peak shaving working condition. The fifth pipeline 8 is connected to both the exhaust port of the high-pressure cylinder 1 and the fourth pipeline 431 and is connected in parallel with the pressure matcher 4, and can realize the connection between the high-pressure cylinder 1 and the feed water pump steam turbine 5 when the pressure matcher 4 fails. When the feed water pump steam turbine 5 is in the deep peak shaving working condition, even if the pressure matcher 4 fails, the steam volume requirements of the feed water pump steam turbine 5 can still be met, ensuring the stable operation of the steam matching system 100 of the feed water pump steam turbine.

[0079] In some embodiments of the present invention, the operating state of the feed water pump steam turbine 5 is the standard working condition. Adjusting the opening and closing of the pipelines of the feed water pump steam turbine steam matching system 100 includes: opening the first pipeline 51 and closing the second pipeline 411, the third pipeline 421, the fourth pipeline 431, and the fifth pipeline 8. It can be understood that, as Figure 1 shown, open the fifth electric isolation valve 511, the second check valve 512, the fifth check valve 513, the ninth electric isolation valve 514, the tenth electric isolation valve 515, the fourth manual isolation valve 516, the eleventh electric isolation valve 517, the sixth check valve 518, the fifth manual isolation valve 519, and the low-pressure steam inlet regulating valve 520, and close the first electric isolation valve 4111, the first check valve 4112, the first manual isolation valve 4114, the first electric regulating valve 4113, the second electric isolation valve 4116, the third electric isolation valve 81, the second manual isolation valve 82, and the fourth electric isolation valve 4211, so as to directly use the intermediate pressure cylinder 2 as the steam source of the feed water pump steam turbine 5 and meet the working requirements of the feed water pump steam turbine 5 under the standard working condition.

[0080] In some embodiments of the present invention, the operating state of the feed water pump steam turbine 5 is the deep peak shaving working condition. Adjusting the opening and closing of the pipelines of the feed water pump steam turbine steam matching system 100 includes: opening the first pipeline 51, the second pipeline 411, the third pipeline 421, and the fourth pipeline 431, and closing the fifth pipeline 8. It can be understood that, as Figure 1 shown, open the fifth electric isolation valve 511, the second check valve 512, the fifth check valve 513, the ninth electric isolation valve 514, the tenth electric isolation valve 515, the fourth manual isolation valve 516, the eleventh electric isolation valve 517, the sixth check valve 518, the fifth manual isolation valve 519, the low-pressure steam inlet regulating valve 520, the first electric isolation valve 4111, the first check valve 4112, the first manual isolation valve 4114, the first electric regulating valve 4113, the second electric isolation valve 4116, and the fourth electric isolation valve 4211, and close the third electric isolation valve 81 and the second manual isolation valve 82, so as to realize the pressure matcher 4 to reconcile and match the high-pressure steam source of the high-pressure cylinder 1 and the low-pressure steam source of the intermediate pressure cylinder 2, mix the steam and then enter the first pipeline 51, and convey the steam along the first pipeline 51 to the feed water pump steam turbine 5, which can provide a steam source for the feed water pump steam turbine 5, realize the operation of the feed water pump steam turbine 5, and the steam volume is higher than the steam volume input into the feed water pump steam turbine 5 only from the first pipeline 51, so as to meet the steam volume requirement of the feed water pump steam turbine 5 when the feed water pump steam turbine 5 is in the deep peak shaving working condition.

[0081] In some embodiments of the present invention, the feed water pump steam turbine 5 is in a deep peak shaving working condition and the pressure matcher 4 fails. Adjusting the on-off of the pipeline of the feed water pump steam turbine steam matching system 100 includes: opening the first pipeline 51 and the fifth pipeline 8; closing the second pipeline 411, the third pipeline 421 and the fourth pipeline 431. It can be understood that, as Figure 1 shown, open the fifth electric isolation valve 511, the second check valve 512, the fifth check valve 513, the ninth electric isolation valve 514, the tenth electric isolation valve 515, the fourth manual isolation valve 516, the eleventh electric isolation valve 517, the sixth check valve 518, the fifth manual isolation valve 519, the low-pressure steam inlet regulating valve 520, the first electric isolation valve 4111, the first check valve 4112, the first manual isolation valve 4114, the first electric regulating valve 4113, the third electric isolation valve 81 and the second manual isolation valve 82, close the second electric isolation valve 4116 and the fourth electric isolation valve 4211. When the feed water pump steam turbine 5 is in a deep peak shaving working condition and the pressure matcher 4 fails, the steam demand of the feed water pump steam turbine 5 can still be met, ensuring the stable operation of the feed water pump steam turbine steam matching system 100.

[0082] Other components and operations of the feed water pump steam turbine steam matching system 100 and its control method according to the embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail here.

[0083] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0084] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A feedwater pump turbine steam matching system, characterized in that: include: High pressure cylinder; Medium pressure cylinder; A reheater, wherein the exhaust port of the high-pressure cylinder is connected to the steam inlet of the reheater, and the exhaust port of the reheater is connected to the steam inlet of the medium-pressure cylinder; A feedwater pump steam turbine, wherein the four-stage steam extraction port of the intermediate pressure cylinder is connected to the feedwater pump steam turbine through a first pipeline; A pressure matcher, wherein the pressure matcher is provided with a high-pressure inlet, a low-pressure inlet and a pressure outlet, wherein the high-pressure inlet is connected to the exhaust port of the high-pressure cylinder via a second pipeline, the low-pressure inlet of the pressure matcher is connected to the first pipeline via a third pipeline, and the pressure outlet of the pressure matcher is connected to the first pipeline via a fourth pipeline, wherein a connection position of the third pipeline to the first pipeline is arranged upstream of a connection position of the fourth pipeline to the first pipeline; A fifth pipeline, wherein the fifth pipeline is connected to the exhaust port of the high-pressure cylinder and the fourth pipeline and is connected in parallel with the pressure matcher.

2. The feedwater pump turbine steam matching system according to claim 1, characterized in that: The second pipeline is provided with a first electric isolation valve for opening or closing the second pipeline; And / or, a first check valve is provided on the second pipeline, which is used to control the steam in the second pipeline to flow only from the exhaust port of the high-pressure cylinder to the high-pressure inlet; And / or, a first electric regulating valve is provided on the second pipeline for controlling the flow of the second pipeline; And / or, a first manual isolation valve is provided on the second pipeline for manually opening or closing the second pipeline.

3. The feedwater pump turbine steam matching system according to claim 1, characterized in that: Also includes: A bypass valve, a first electric regulating valve is arranged on the second pipeline, and the bypass valve is connected in parallel with the first electric regulating valve and is used for maintenance and isolation of the first electric regulating valve.

4. The feedwater pump turbine steam matching system according to claim 1, characterized in that: The second pipeline is provided with a second electric isolation valve for opening or closing the second pipeline, and the inlet of the fifth pipeline is provided upstream of the second electric isolation valve.

5. The feedwater pump turbine steam matching system according to claim 1, characterized in that: The fifth pipeline is provided with a third electric isolation valve for opening or closing the fifth pipeline; And / or, a second manual isolation valve is provided on the fifth pipeline for manually opening or closing the fifth pipeline; And / or, a fourth electric isolation valve is provided on the third pipeline for opening or closing the third pipeline.

6. The feedwater pump turbine steam matching system according to claim 1, characterized in that: Also includes: A flow orifice plate is disposed on the first pipeline and is located downstream of the fourth pipeline.

7. The feedwater pump turbine steam matching system according to claim 1, characterized in that: A fifth electric isolation valve is provided on the first pipeline, and the fifth electric isolation valve is provided between the connection point of the first pipeline and the third pipeline and the connection point of the first pipeline and the fourth pipeline, and is used to open or close the first pipeline; And / or, a second check valve is provided on the first pipeline, and the second check valve is provided between the connection point of the first pipeline and the third pipeline and the connection point of the first pipeline and the fourth pipeline, and is used to control the steam in the first pipeline to flow only from the four-stage steam extraction port of the intermediate pressure cylinder to the low-pressure inlet.

8. The feedwater pump turbine steam matching system according to claim 1, characterized in that: The feedwater pump turbine steam matching system further includes: a drain expansion tank, the drain expansion tank is in communication with the second pipeline, and a third manual isolation valve and a hydraulic isolation valve are provided upstream of the drain expansion tank; And / or, the feedwater pump steam turbine steam matching system also includes: an auxiliary steam header, the auxiliary steam header is connected to the exhaust port of the high-pressure cylinder and the four-stage steam extraction port of the medium-pressure cylinder, and the auxiliary steam header is connected to the feedwater pump steam turbine.

9. A feedwater pump steam turbine steam matching system control method, characterized in that: Using the feedwater pump steam turbine steam matching system according to any one of claims 1 to 8, the feedwater pump steam turbine steam matching system control method comprises: Confirming the working status of the feedwater pump turbine; Regulate the on-off of the pipeline of the feedwater pump turbine steam matching system.

10. The feedwater pump turbine steam matching system control method according to claim 9, characterized in that: The working state of the feedwater pump steam turbine is a standard working condition, and the adjusting of the pipeline on-off of the feedwater pump steam turbine steam matching system includes: opening the first pipeline, closing the second pipeline, the third pipeline, the fourth pipeline and the fifth pipeline; And / or, the working state of the feedwater pump steam turbine is a deep peak load condition, and the adjusting the pipeline on-off of the feedwater pump steam turbine steam matching system includes: opening the first pipeline, the second pipeline, the third pipeline and the fourth pipeline, and closing the fifth pipeline; And / or, the working state of the feedwater pump steam turbine is a deep peak-shaving condition and the pressure matcher fails, and the adjustment of the pipeline on-off of the feedwater pump steam turbine steam matching system includes: opening the first pipeline and the fifth pipeline; closing the second pipeline, the third pipeline and the fourth pipeline.

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