Pipe heating steam recovery device and process before starting of steam extraction and condensation type steam turbine

Abstract

The invention relates to the technical field of steam turbines, in particular to a warm pipe steam recovery device and process before starting of a steam extraction and condensation type steam turbine, and the warm pipe steam recovery device comprises a steam recovery device body which comprises a steam turbine and a main steam adjusting mechanism connected with the steam turbine. A temperature and pressure reduction adjusting mechanism is arranged at the tail end of the main steam adjusting mechanism before entering the steam turbine, the temperature and pressure reduction adjusting mechanism and the main steam adjusting mechanism are connected and provided with a steam recovery adjusting mechanism, the steam recovery device body is further provided with a steam extraction sending-out adjusting mechanism, and a dead steam outlet adjusting mechanism is arranged at the tail end of the steam turbine. The invention further provides a warm pipe steam recovery device used before starting of the steam extraction and condensation type steam turbine, the temperature and pressure reducer is arranged on the warm pipe steam emptying pipeline, the recovered steam is merged into a low-pressure steam pipe network to be recycled, and waste of steam energy is effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of steam turbines, and in particular to a device and process for recovering pipe warming steam before startup of an extraction condensing steam turbine. Background Art

[0002] In the power industry, extraction condensing steam turbines play a vital role. Their operating efficiency and stability are directly related to the economic returns of power plants and their contribution to the environment. In this context, the pre-startup preparation of the steam turbine - the pipe warm-up process, is particularly critical. The pipe warm-up is intended to preheat the steam pipes to ensure smooth and efficient steam transportation, thus laying a solid foundation for the smooth operation of the steam turbine.

[0003] However, the traditional pipe heating practice is accompanied by a problem that cannot be ignored: a large amount of steam is directly discharged into the atmosphere during the pipe heating process, which not only means the unnecessary loss of precious energy, but also creates an unnecessary burden on the ecological environment. Faced with this challenge, the power industry has begun to actively seek innovative solutions, among which steam recovery technology has become the key to solving the problem. The core of this technology is to effectively capture and reuse the steam generated during the pipe heating process, thereby maximizing energy utilization and environmentally friendly protection.

[0004] Unfortunately, the steam recovery devices for steam turbines on the market currently generally have defects such as complicated structure, cumbersome operation and low recovery efficiency, which greatly limits the application and promotion of steam turbines in actual production. Therefore, it is urgent to develop a pre-startup warm-up steam recovery device for extraction condensing steam turbines that has a simple structure, convenient operation and significant recovery efficiency.

[0005] In response to this urgent need, the industry is committed to exploring new design concepts and technical paths. An ideal recovery device should have the following characteristics: first, the structural design should be simple and clear, easy to install and maintain; second, the operation interface should be intuitive and easy to use, reducing the professional skills required of operators; finally, and most importantly, the recovery efficiency should be significantly improved to ensure that as much steam as possible can be effectively recovered and put back into the production process. Summary of the invention

[0006] In order to solve some problems existing in the above-mentioned prior art, the present invention provides a steam recovery device for warming up the pipes before starting up a steam extraction condensing steam turbine. The device can efficiently recover and utilize the steam generated during the warming up process before starting up, thereby improving energy utilization efficiency, reducing environmental pollution, and protecting equipment safety.

[0007] To achieve the above-mentioned purpose, the present invention provides a steam recovery device for warming up the pipes before starting up an extraction condensing steam turbine, comprising a steam recovery device body, the steam recovery device body comprising a steam turbine, the steam turbine, the steam turbine is connected to a steam main pipe regulating mechanism, a temperature and pressure reduction regulating mechanism is arranged at the end of the steam main pipe regulating mechanism before entering the steam turbine, the steam recovery device body is also provided with a mid-extraction regulating mechanism, and a spent steam outlet regulating mechanism is arranged at the end of the steam turbine.

[0008] As a further improvement of the present invention, in order to improve the regulation effect of steam and ensure the stability and reliability of steam parameters, the temperature reduction and pressure reduction regulating mechanism includes a temperature reduction and pressure reduction water pipeline, the temperature reduction and pressure reduction water pipeline is provided with a temperature reduction and pressure reduction water valve group, the temperature reduction and pressure reduction water valve group is provided with a temperature reduction and pressure reducer, and the temperature reduction and pressure reduction regulating mechanism is connected to the steam main regulating mechanism through the temperature reduction and pressure reduction water pipeline and the temperature reduction and pressure reduction water valve group.

[0009] As a further improvement of the present invention, in order to effectively control the steam flow and pressure on the steam main line and ensure the stable operation of the steam turbine, the steam main line regulating mechanism includes a steam main line, a steam main line valve group is arranged on the steam main line, a steam inlet is arranged in conjunction with the steam main line, and a warm-up steam regulating mechanism is arranged on the steam main line in conjunction with the steam main line valve group.

[0010] As a further improvement of the present invention, in order to ensure that the heating pipe steam can be emptied in a predetermined manner and avoid waste of steam and environmental pollution, the heating pipe steam regulating mechanism includes a heating pipe steam pipeline, and the heating pipe steam pipeline is provided with a heating pipe steam venting valve group, and the heating pipe steam pipeline is also provided with a heating pipe steam recovery valve group. The heating pipe steam regulating mechanism empties the heating pipe steam through the heating pipe steam venting valve group and the heating pipe steam recovery valve group.

[0011] As a further improvement of the present invention, in order to achieve precise control of the steam flow on the steam recycling pipeline, improve the utilization rate of steam, make the emptying process more flexible and controllable, and adapt to different working conditions, the middle pump-out regulating mechanism includes a steam recycling pipeline, and a middle pump-out valve group is arranged on the steam recycling pipeline, and the two ends of the steam recycling pipeline are respectively connected to the steam main pipe regulating mechanism and the steam turbine.

[0012] As a further improvement of the present invention, in order to ensure that the exhaust steam can be discharged and recovered in a predetermined manner and avoid waste of resources and environmental pollution, the exhaust steam outlet regulating mechanism includes an exhaust steam outlet pipeline, one end of the exhaust steam outlet pipeline is provided with an exhaust steam outlet valve group, the other end of the exhaust steam outlet pipeline is connected to the steam turbine, and the other end is provided with an exhaust steam recovery system.

[0013] The beneficial effects of the present invention are embodied in the following aspects: Improve steam utilization: Through the arrangement of the steam main regulating mechanism, the temperature and pressure reduction regulating mechanism, and the middle extraction and delivery regulating mechanism, the present invention realizes accurate control and effective utilization of steam flow. In particular, during the pipe heating process, part of the pipe heating steam is recycled through the pipe heating steam regulating mechanism, thus avoiding steam waste and improving the steam utilization of the entire system.

[0014] Enhanced system flexibility: Each regulating mechanism, such as the cooling and pressure reducing water valve group, the steam main line valve group, the warm pipe steam venting valve group, the warm pipe steam recovery valve group and the intermediate pump-out valve group, are equipped with corresponding valves and regulating devices, so that the operator can flexibly adjust the steam flow, temperature and pressure according to actual needs, thereby enhancing the flexibility and adaptability of the system.

[0015] Ensure safe operation of the steam turbine: Through precise steam regulation and recovery, the present invention ensures that during the pipe warm-up process before the start-up of the steam turbine, steam can enter the steam turbine at a predetermined pressure and temperature, avoiding damage to the steam turbine due to inappropriate steam parameters, thereby ensuring the safe operation of the steam turbine.

[0016] Improve economic efficiency: The present invention reduces energy consumption and improves the economic efficiency of the entire system by recycling and reusing part of the steam and exhaust steam. At the same time, due to the compact structure, reasonable layout, easy installation and maintenance of the device, the operating cost of the system is further reduced.

[0017] Promote environmental protection: By reducing the emission of steam and exhaust steam, the present invention reduces pollution to the environment and meets the current environmental protection requirements. In particular, in the process of heating pipes, by recycling part of the heating pipe steam, direct emission of steam is avoided, which plays a positive role in environmental protection.

[0018] The present invention also provides a process for a pre-startup warm-up steam recovery device for an extraction condensing steam turbine, the process comprising the following steps: Step 1: The staff shall carefully check the steam main line, heating pipe steam line, steam recovery line 16, desuperheater, desuperheater water line and valves in the device to ensure that there is no damage or leakage. According to the operation requirements of the steam turbine, adjust the opening of the desuperheater water valve group to ensure that the desuperheater can work normally. Step 2: Before starting the heating steam pipeline, close the steam main line valve group, exhaust steam outlet valve group, middle extraction valve group and other non-essential valves to prevent steam loss and interference with the heating process, and open the heating steam venting valve group to provide a channel for the heating steam that is about to enter; Step 3: Open the steam inlet valve to allow steam to enter the steam main line, adjust the steam flow rate through the steam main line valve group to meet the start-up requirements of the steam turbine, and set temperature and pressure sensors on the steam main line to monitor the steam parameters in real time; Step 4: Open the heating pipe steam regulating mechanism to preheat part of the steam through the heating pipe steam pipeline, adjust the exhaust volume of the heating pipe steam through the heating pipe steam venting valve group to control the temperature and pressure of the steam, open the heating pipe steam recovery valve group, and recover part of the heating pipe steam into the system to reduce energy waste; Step 5: When the temperature of the warm-up steam pipeline reaches a predetermined value, the warm-up steam venting valve group is closed to stop the steam venting operation. Before the steam enters the steam turbine, the temperature and pressure of the steam are adjusted by the temperature reduction and pressure reduction regulating mechanism. The temperature reduction and pressure reduction water valve group is opened to allow the temperature reduction water in the temperature reduction and pressure reduction water pipeline to enter the steam main pipeline, and the temperature and pressure reduction of the steam are achieved through the temperature reduction and pressure reduction device. Step 6: Set a pumping valve group on the steam recycling pipeline to adjust the steam recycling amount according to the operation demand of the steam turbine. The steam recycling pipeline extracts part of the steam from the steam main regulating mechanism and sends it back to the steam turbine for recycling; Step 7: When the steam turbine needs to be shut down, first close the steam main line valve group to stop supplying steam to the steam turbine, then open the exhaust steam outlet valve group to allow the exhaust steam in the steam turbine to be discharged through the exhaust steam outlet pipeline; according to the shutdown requirements of the steam turbine, adjust the opening of the exhaust steam outlet valve group to control the exhaust steam discharge speed and pressure; Step 8: During the exhaust steam discharge process, pay attention to the operating status of the steam turbine and the device to ensure that no abnormal situation occurs. When the exhaust steam is completely discharged, close the exhaust steam outlet valve group and stop the operation of the device.

[0019] The beneficial effects of this process are reflected in the following aspects: Improve steam utilization efficiency: By precisely controlling the flow, temperature and pressure of steam, and recovering part of the warm-up steam and exhaust steam, this process significantly improves the efficiency of steam utilization. This not only reduces steam waste, but also reduces energy consumption, thereby improving the economy of the entire system.

[0020] Ensure safe operation of the steam turbine: During the warm-up process, the steam parameters are gradually adjusted to ensure that the steam enters the steam turbine at the appropriate temperature and pressure, avoiding damage to the steam turbine caused by mismatched steam parameters. At the same time, careful inspection of each component of the device also ensures the safe operation of the steam turbine.

[0021] Enhanced system flexibility and controllability: This process achieves flexible regulation and precise control of steam flow through the setting of multiple valve groups and regulating mechanisms. Operators can adjust steam parameters and flow at any time according to the operating requirements and actual conditions of the steam turbine, which enhances the flexibility and controllability of the system.

[0022] Improve the automation level of the system: Temperature and pressure sensors are installed on the steam main line to monitor the parameters of steam in real time, providing accurate data support for operators. This helps to achieve automatic control of the system, reduce human operating errors, and improve the stability and reliability of the system.

[0023] Promote environmental protection and sustainable development: By recycling and reusing part of the steam and exhaust steam, this process reduces the emission of waste gas and reduces pollution to the environment.

[0024] When the present invention is working, the staff carefully checks all the components of the device, including the steam main line, the warm-up steam pipeline, the steam recovery pipeline 16, the temperature and pressure reducing device, the temperature and pressure reducing water pipeline and valves, etc., to ensure that there is no damage or leakage; according to the operating requirements of the steam turbine, the opening of the temperature and pressure reducing water valve group is pre-adjusted to ensure that the temperature and pressure reducing device can work normally.

[0025] Close the steam main line valve group, exhaust steam outlet valve group, intermediate extraction valve group, etc. to prevent steam loss and interference with the pipe heating process; open the heating pipe steam vent valve group to provide a channel for the heating pipe steam.

[0026] Open the steam inlet valve to allow steam to enter the steam main line; adjust the steam flow rate through the steam main line valve group to meet the start-up requirements of the steam turbine; monitor the temperature and pressure of the steam in real time to ensure that the parameters are within the controllable range.

[0027] Open the heating pipe steam regulating mechanism to allow part of the steam to be preheated through the heating pipe steam pipeline; adjust the exhaust volume of the heating pipe steam through the heating pipe steam venting valve group to control the temperature and pressure of the steam; at the same time, open the heating pipe steam recovery valve group to recover part of the heating pipe steam into the system to reduce energy waste.

[0028] When the temperature of the warm-up steam pipeline reaches the preset value, close the warm-up steam vent valve group; before the steam enters the steam turbine, adjust the temperature and pressure of the steam through the temperature and pressure reduction regulating mechanism to ensure that the steam parameters meet the starting requirements of the steam turbine; after ensuring that the steam parameters are appropriate, start the steam turbine.

[0029] During the operation of the steam turbine, the amount of steam reused is adjusted according to the operation requirements through the middle extraction and delivery regulating mechanism (middle extraction and delivery valve group); the steam reuse pipeline extracts part of the steam from the steam main regulating mechanism and sends it back to the steam turbine for reuse, thereby improving the utilization rate of the steam.

[0030] When the steam turbine needs to be shut down, first close the steam main line valve group to stop supplying steam to the steam turbine; open the exhaust steam outlet valve group to allow the exhaust steam in the steam turbine to be discharged through the exhaust steam outlet pipeline; according to the shutdown requirements of the steam turbine, adjust the opening of the exhaust steam outlet valve group to control the exhaust steam discharge speed and pressure; during the exhaust steam discharge process, the staff must pay attention to observe the operating status of the steam turbine and the device to ensure that no abnormal situation occurs; when the exhaust steam is completely discharged, close the exhaust steam outlet valve group to stop the operation of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings: Figure 1 It is a structural diagram of the present invention.

[0032] Among them, 1 steam turbine, 2 steam main regulating mechanism, 3 cooling and pressure reducing regulating mechanism, 4 middle extraction and delivery regulating mechanism, 5 exhaust steam outlet regulating mechanism, 6 cooling and pressure reducing water pipeline, 7 cooling and pressure reducing water valve group, 8 cooling and pressure reducing device, 9 steam main line, 10 steam main line valve group, 11 steam inlet, 12 warm pipe steam regulating mechanism, 13 warm pipe steam pipeline, 14 warm pipe steam venting valve group, 15 warm pipe steam recovery valve group, 16 steam recycling pipeline, 17 middle extraction and delivery valve group, 18 exhaust steam outlet pipeline, 19 exhaust steam outlet valve group, 20 exhaust steam recovery system. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution in this application, Figure 1 The present invention is further described. The following examples are only used to more clearly illustrate the technical solution of the present invention, and are not intended to limit the protection scope of the present invention.

[0034] like Figure 1 The steam recovery device for warming up the pipes before starting up an extraction condensing steam turbine shown in the figure comprises a steam recovery device body, the steam recovery device body comprises a steam turbine 1, the steam turbine 1 is connected to a steam main pipe regulating mechanism 2, a temperature and pressure reduction regulating mechanism 3 is arranged before the end of the steam main pipe regulating mechanism 2 enters the steam turbine 1, the steam recovery device body is also provided with a middle extraction and delivery regulating mechanism 4, and a spent steam outlet regulating mechanism 5 is arranged at the end of the steam turbine 1.

[0035] The cooling and pressure reducing regulating mechanism 3 includes a cooling and pressure reducing water pipeline 6, on which a cooling and pressure reducing water valve group 7 is provided, and the cooling and pressure reducing water valve group 7 is provided with a cooling and pressure reducing device 8. The cooling and pressure reducing regulating mechanism 3 is connected to the steam main regulating mechanism 2 via the cooling and pressure reducing water pipeline 6 and the cooling and pressure reducing water valve group 7.

[0036] The steam main regulating mechanism 2 comprises a steam main line 9 , on which a steam main line valve group 10 is arranged, and the steam main line 9 is provided with a steam inlet 11 , and the steam main line 9 is provided with a warm-up pipe steam regulating mechanism 12 in cooperation with the steam main line valve group 10 .

[0037] The heating pipe steam regulating mechanism 12 includes a heating pipe steam pipeline 13, which is equipped with a heating pipe steam venting valve group 14. The heating pipe steam pipeline 13 is also equipped with a heating pipe steam recovery valve group 15. The heating pipe steam regulating mechanism 12 vents the heating pipe steam through the heating pipe steam venting valve group 14 and the heating pipe steam recovery valve group 15.

[0038] The middle pumping out regulating mechanism 4 comprises a steam recycling pipeline 16, on which a middle pumping out valve group 17 is arranged, and both ends of the steam recycling pipeline 16 are connected to the steam main regulating mechanism 2 and the steam turbine 1 respectively.

[0039] The exhaust steam outlet regulating mechanism 5 comprises an exhaust steam outlet pipeline 18 , one end of which is provided with an exhaust steam outlet valve group 19 , the other end of which is connected to the steam turbine 1 , and the other end is provided with an exhaust steam recovery system 20 .

[0040] A process for a steam recovery device for warming up pipes before starting up an extraction condensing steam turbine, the process comprising the following steps: Step 1: The staff shall carefully check the steam main line 9, the warm-up steam line 13, the steam recovery line 16, the desuperheater 8, the desuperheater water line 6 and the valves in the device to ensure that there is no damage or leakage. According to the operation requirements of the steam turbine 1, adjust the opening of the desuperheater water valve group 7 to ensure that the desuperheater 8 can work normally. Step 2: Before starting the heating steam pipeline 13, close the steam main pipeline valve group 10, the exhaust steam outlet valve group 19, the middle extraction valve group 17 and other non-essential valves to prevent steam loss and interference with the heating process, and open the heating steam venting valve group 14 to provide a channel for the heating steam that is about to enter; Step 3: Open the steam inlet valve 11 to allow steam to enter the steam main line 9, adjust the steam flow rate through the steam main line valve group 10 to meet the startup requirements of the steam turbine 1, and set temperature and pressure sensors on the steam main line 9 to monitor the parameters of the steam in real time; Step 4: Open the heating pipe steam regulating mechanism 12 to preheat part of the steam through the heating pipe steam pipeline 13, adjust the exhaust volume of the heating pipe steam through the heating pipe steam venting valve group 14 to control the temperature and pressure of the steam, open the heating pipe steam recovery valve group 15, and recover part of the heating pipe steam into the system to reduce energy waste; Step 5: When the temperature of the warm-up steam pipeline 13 reaches a predetermined value, the warm-up steam venting valve group 14 is closed to stop the steam venting operation. Before the steam enters the steam turbine 1, the temperature and pressure of the steam are adjusted by the temperature reduction and pressure reduction regulating mechanism 3. The temperature reduction and pressure reduction water valve group 7 is opened to allow the temperature reduction water in the temperature reduction and pressure reduction water pipeline 6 to enter the steam main pipeline 9, and the temperature and pressure reduction of the steam are achieved through the temperature reduction and pressure reduction device 8. Step 6: A middle extraction valve group 17 is set on the steam recycling pipeline 16 to adjust the steam recycling amount according to the operation demand of the steam turbine 1. The steam recycling pipeline 16 extracts part of the steam from the steam main regulating mechanism 2 and sends it back to the steam turbine 1 for recycling; Step 7: When the steam turbine 1 needs to be shut down, first close the steam main line valve group 10 to stop supplying steam to the steam turbine 1, then open the exhaust steam outlet valve group 19 to allow the exhaust steam in the steam turbine 1 to be discharged through the exhaust steam outlet pipeline 18; according to the shutdown requirements of the steam turbine 1, adjust the opening of the exhaust steam outlet valve group 19 to control the exhaust steam discharge speed and pressure; Step 8: During the exhaust steam discharge process, pay attention to the operating status of the steam turbine 1 and the device to ensure that no abnormal situation occurs. When the exhaust steam is completely discharged, close the exhaust steam outlet valve group 19 to stop the operation of the device.

[0041] When the present invention is working, the staff carefully checks all the components of the device, including the steam main line 9, the warm-up steam pipeline 13, the steam recovery pipeline 16, the temperature and pressure reducing device 8, the temperature and pressure reducing water pipeline 6 and the valves, etc., to ensure that there is no damage or leakage; according to the operating requirements of the steam turbine 1, the opening of the temperature and pressure reducing water valve group 7 is pre-adjusted to ensure that the temperature and pressure reducing device 8 can work normally.

[0042] Close the steam main line valve group 10, the exhaust steam outlet valve group 19, the intermediate extraction valve group 17, etc. to prevent steam loss and interference with the pipe heating process; open the heating pipe steam vent valve group 14 to provide a channel for the heating pipe steam.

[0043] Open the steam inlet 11 valve to allow steam to enter the steam main line 9; adjust the steam flow rate through the steam main line valve group 10 to meet the startup requirements of the steam turbine 1; monitor the temperature and pressure of the steam in real time to ensure that the parameters are within the controllable range.

[0044] The heating pipe steam regulating mechanism 12 is opened to allow part of the steam to be preheated through the heating pipe steam pipeline 13; the exhaust volume of the heating pipe steam is adjusted through the heating pipe steam venting valve group 14 to control the temperature and pressure of the steam; at the same time, the heating pipe steam recovery valve group 15 is opened to recover part of the heating pipe steam into the system to reduce energy waste.

[0045] When the temperature of the warm-up steam pipeline 13 reaches a predetermined value, the warm-up steam vent valve group 14 is closed; before the steam enters the steam turbine 1, the temperature and pressure of the steam are adjusted by the temperature reduction and pressure reduction regulating mechanism 3 to ensure that the steam parameters meet the start-up requirements of the steam turbine 1; after ensuring that the steam parameters are appropriate, the steam turbine 1 is started.

[0046] During the operation of the steam turbine 1, the amount of steam reused is adjusted according to the operation requirements through the extraction valve group 17 in the middle extraction regulating mechanism 4; the steam reuse pipeline 16 extracts part of the steam from the steam main regulating mechanism 2 and sends it back to the steam turbine 1 for reuse, thereby improving the utilization rate of the steam.

[0047] When the steam turbine 1 needs to be shut down, first close the steam main line valve group 10 to stop supplying steam to the steam turbine 1; open the exhaust steam outlet valve group 19 to allow the exhaust steam in the steam turbine 1 to be discharged through the exhaust steam outlet pipeline 18; according to the shutdown requirements of the steam turbine 1, adjust the opening of the exhaust steam outlet valve group 19 to control the exhaust steam discharge speed and pressure; during the exhaust steam discharge process, the staff must pay attention to observe the operating status of the steam turbine 1 and the device to ensure that no abnormal situation occurs; when the exhaust steam is completely discharged, close the exhaust steam outlet valve group 19 to stop the operation of the device.

[0048] The present invention is not limited to the above-mentioned embodiments. On the basis of the technical solution disclosed in the present invention, technicians in this field can make some substitutions and deformations to some technical features therein according to the disclosed technical content without creative labor, and these substitutions and deformations are all within the protection scope of the present invention.

Claims

1. A steam recovery device for warming up pipes before starting up an extraction condensing steam turbine, comprising a steam recovery device body, characterized in that: The steam recovery device body comprises a steam turbine (1), the steam turbine (1), the steam turbine (1) is connected to a steam main pipe regulating mechanism (2), a temperature reduction and pressure reduction regulating mechanism (3) is arranged before the end of the steam main pipe regulating mechanism (2) enters the steam turbine (1), the steam recovery device body is further provided with a mid-pumping regulating mechanism (4), and the end of the steam turbine (1) is provided with an exhaust steam outlet regulating mechanism (5).

2. The device for recovering pipe warm-up steam before startup of an extraction condensing steam turbine according to claim 1, characterized in that: The temperature reduction and pressure reduction regulating mechanism (3) comprises a temperature reduction and pressure reduction water pipeline (6), the temperature reduction and pressure reduction water pipeline (6) is provided with a temperature reduction and pressure reduction water valve group (7), the temperature reduction and pressure reduction water valve group (7) is provided with a temperature reduction and pressure reduction device (8), and the temperature reduction and pressure reduction regulating mechanism (3) is connected to the steam main regulating mechanism (2) via the temperature reduction and pressure reduction water pipeline (6) and the temperature reduction and pressure reduction water valve group (7).

3. The device for recovering steam from the pipe warming before startup of an extraction condensing steam turbine according to claim 1, characterized in that: The steam main pipe regulating mechanism (2) comprises a steam main line (9), a steam main line valve group (10) is provided on the steam main line (9), a steam inlet (11) is provided in cooperation with the steam main line (9), and a warm-up pipe steam regulating mechanism (12) is provided in cooperation with the steam main line valve group (10) on the steam main line 9.

4. The device for recovering steam from the pipe warming before startup of an extraction condensing steam turbine according to claim 3, characterized in that: The heating pipe steam regulating mechanism (12) comprises a heating pipe steam pipeline (13), the heating pipe steam pipeline (13) is provided with a heating pipe steam venting valve group (14), and the heating pipe steam pipeline (13) is also provided with a heating pipe steam recovery valve group (15). The heating pipe steam regulating mechanism (12) vents the heating pipe steam through the heating pipe steam venting valve group (14) and the heating pipe steam recovery valve group (15).

5. The device for recovering steam from the pipe warming before startup of an extraction condensing steam turbine according to claim 1, characterized in that: The middle pumping out regulating mechanism (4) comprises a steam recycling pipeline (16), on which a middle pumping out valve group (17) is arranged, and both ends of the steam recycling pipeline (16) are respectively connected to the steam main pipe regulating mechanism (2) and the steam turbine (1).

6. The device for recovering steam from the pipe warming before startup of an extraction condensing steam turbine according to claim 1, characterized in that: The exhaust steam outlet regulating mechanism (5) comprises an exhaust steam outlet pipeline (18), one end of the exhaust steam outlet pipeline (18) being provided with an exhaust steam outlet valve group (19), the other end of the exhaust steam outlet pipeline (18) being connected to the steam turbine (1), and the other end being provided with an exhaust steam recovery system (20).

7. The process of the extraction condensing steam turbine pre-startup warm-up steam recovery device according to claim 1 is characterized in that: The process comprises the following steps: Step 1: The staff shall carefully check the steam main line (9), the warm-up steam line (13), the steam recovery line (16), the desuperheater (8), the desuperheater water line (6) and valves in the device to ensure that there is no damage or leakage. According to the operating requirements of the steam turbine (1), the staff shall adjust the opening of the desuperheater water valve group (7) to ensure that the desuperheater (8) can operate normally. Step 2: Before starting the pipe heating steam pipeline (13), close the steam main pipeline valve group (10), the exhaust steam outlet valve group (19), the intermediate extraction valve group (17) and other non-essential valves to prevent steam loss and interference with the pipe heating process, and open the pipe heating steam venting valve group (14) to provide a channel for the pipe heating steam that is about to enter; Step 3: Open the steam inlet (11) valve to allow steam to enter the steam main line (9), adjust the steam flow rate through the steam main line valve group (10) to meet the start-up requirements of the steam turbine (1), and set temperature and pressure sensors on the steam main line (9) to monitor steam parameters in real time; Step 4: Open the heating pipe steam regulating mechanism (12) to allow part of the steam to be preheated through the heating pipe steam pipeline (13), adjust the exhaust volume of the heating pipe steam through the heating pipe steam venting valve group (14) to control the temperature and pressure of the steam, open the heating pipe steam recovery valve group (15) to recover part of the heating pipe steam into the system to reduce energy waste; Step 5: When the temperature of the warm-up steam pipeline (13) reaches a predetermined value, the warm-up steam venting valve group (14) is closed to stop the steam venting operation. Before the steam enters the steam turbine (1), the temperature and pressure of the steam are adjusted by the temperature reduction and pressure reduction regulating mechanism (3). The temperature reduction and pressure reduction water valve group (7) is opened to allow the cooling water in the temperature reduction and pressure reduction water pipeline (6) to enter the steam main pipeline (9), and the temperature and pressure of the steam are reduced by the temperature reduction and pressure reduction device (8). Step 6: a steam extraction valve group (17) is provided on the steam recycling pipeline (16) to adjust the amount of steam to be recycled according to the operating requirements of the steam turbine (1). The steam recycling pipeline (16) extracts part of the steam from the steam main regulating mechanism (2) and returns it to the steam turbine (1) for recycling; Step 7: When the steam turbine (1) needs to be shut down, firstly close the steam main line valve group (10) to stop supplying steam to the steam turbine (1), then open the exhaust steam outlet valve group (19) to allow the exhaust steam in the steam turbine (1) to be discharged through the exhaust steam outlet pipeline (18); according to the shutdown requirements of the steam turbine (1), adjust the opening of the exhaust steam outlet valve group (19) to control the exhaust steam discharge speed and pressure; Step 8: During the exhaust steam discharge process, pay attention to the operating status of the steam turbine (1) and the device to ensure that no abnormal situation occurs. When the exhaust steam is completely discharged, close the exhaust steam outlet valve group (19) to stop the operation of the device.

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