Steam exhaust method and device for heat supply pipeline of steam turbine

Abstract

The invention relates to the technical field of steam turbine heat supply, in particular to a steam turbine heat supply pipeline steam exhaust method and device.The steam turbine heat supply pipeline steam exhaust device comprises a main body assembly which comprises a generator, a high-pressure cylinder and an intermediate-pressure cylinder, and the high-pressure cylinder and the intermediate-pressure cylinder are arranged at one end of the generator; the bypass pipeline is used for automatically opening the high-medium-low pressure bypass valve when the exhaust steam pressure of the medium-pressure cylinder reaches a preset threshold value, the amount of steam entering the heating network heater is reduced, and the exhaust steam pressure of the medium-pressure cylinder is further reduced. The heat supply assembly comprises a heat supply steam extraction mother pipe arranged at one end of the heat supply network heater, a steam exhaust electric door of the heat supply steam extraction mother pipe is additionally arranged, and automatic starting logic is configured; the steam exhaust electrically operated gate can be automatically opened when the steam exhaust pressure of the medium-pressure cylinder reaches 0.85 times of an alarm value, so that tripping of a steam turbine and interruption of heat supply of a unit are prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of steam turbine heat supply, and particularly to a steam exhaust method and device for a steam turbine heat supply pipeline. Background Art

[0002] The unit group consists of two M701F4 heavy-duty gas turbines and one steam turbine. An SSS clutch is provided between the high and intermediate pressure rotor and the low pressure rotor of the steam turbine, and the low pressure steam turbine can be connected or disconnected from the high pressure steam turbine as needed. When the speed on the input side (low pressure steam turbine side) of the clutch tends to exceed the speed on the output side (high pressure steam turbine side), the clutch will automatically start to engage to connect the low pressure steam turbine, realizing the extraction condensing mode and pure condensing mode operation of the unit. When the speed on the input side of the clutch becomes slower relative to the output side, the clutch will automatically disengage to disconnect the driver of the low pressure steam turbine, and all the steam in the high and intermediate pressure cylinders is extracted to the heat network through the intermediate extraction to ensure the maximum extraction steam volume.

[0003] When the steam turbine operates in the back pressure mode, the exhaust steam from the intermediate pressure cylinder all enters the heat network heater for unit heat supply. At this time, the heat network circulating water volume in the heat network heater must be maintained above a certain amount. If the heat network circulating water volume rapidly decreases due to abnormalities in the heat network water system during unit operation, the steam discharged from the intermediate pressure cylinder cannot be condensed, resulting in a rapid rise in the exhaust steam pressure of the intermediate pressure cylinder to the protection value, and the steam turbine will trip due to high intermediate extraction pressure protection, causing the unit heat supply to be interrupted.

[0004] Currently, when the heat network water volume drops sharply, the following measures are usually taken:

[0005] Rapidly reduce the unit load: reduce the steam inlet volume and exhaust steam volume of the steam turbine. However, due to the heat storage effect of the waste heat boiler, the steam inlet volume of the steam turbine drops slowly within 5 - 10 minutes, and the exhaust steam pressure of the intermediate pressure cylinder drops slowly.

[0006] Part of the exhaust steam from the intermediate pressure cylinder enters the condenser to slow down the rising speed of the exhaust steam pressure of the intermediate pressure cylinder. However, when operating in the back pressure mode, it takes 10 minutes for the low pressure rotor of the steam turbine to accelerate to 3000 rpm, and adding other operations, it takes about 12 minutes in total to switch from the extraction condensing mode to the back pressure mode. During this period, the exhaust steam pressure of the intermediate pressure cylinder still drops slowly. Summary of the Invention

[0007] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part, as well as in the specification abstract and the invention title of this application, to avoid obscuring the purpose of this part, the specification abstract, and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0008] In view of the problem that when the hot water network water volume drops sharply, the exhaust steam pressure of the intermediate pressure cylinder cannot be effectively reduced in a short time, resulting in the exhaust steam pressure of the intermediate pressure cylinder exceeding the protection value and delaying for 3 seconds, and the steam turbine trips, and the external heat supply of the unit is interrupted, the present invention is proposed.

[0009] Therefore, the object of the present invention is to provide a method and device for exhausting steam from a steam turbine heating pipeline.

[0010] To solve the above technical problems, the present invention provides the following technical solutions: A method for exhausting steam from a steam turbine heating pipeline, including: real-time monitoring of the return water pressure of the hot water network and the hot water network water flow, and monitoring of the exhaust steam pressure of the intermediate pressure cylinder;

[0011] When the exhaust steam pressure of the intermediate pressure cylinder drops to 105% of the preset control value, automatically close the exhaust steam motorized valve of the heating extraction main pipe;

[0012] When the exhaust steam pressure of the intermediate pressure cylinder continues to rise to the preset alarm value, and the unit is in the back pressure state and the hot water network water volume is less than or equal to 5000 tons / hour, trigger the automatic interlock opening logic of the high, medium and low pressure bypasses;

[0013] After the exhaust steam pressure of the intermediate pressure cylinder drops to 85% of the preset alarm value, the high, medium and low pressure bypasses automatically return to the automatic state.

[0014] As a preferred solution of the method for exhausting steam from a steam turbine heating pipeline according to the present invention, when it is detected that the exhaust steam pressure of the intermediate pressure cylinder rises to 0.85 times the alarm value, automatically open the exhaust steam motorized valve of the heating extraction main pipe to reduce the exhaust steam pressure of the intermediate pressure cylinder;

[0015] After the exhaust steam pressure of the intermediate pressure cylinder drops to 105% of the control value, automatically interlock and close the exhaust steam motorized valve of the heating extraction main pipe;

[0016] When the exhaust steam pressure of the intermediate pressure cylinder continues to rise to the alarm value, and the unit is in the back pressure state and the hot water network water volume is less than or equal to 5000 t / h, trigger the automatic interlock opening logic of the high, medium and low pressure bypasses to reduce the steam volume entering the heat network heater and further reduce the exhaust steam pressure of the intermediate pressure cylinder;

[0017] After the exhaust steam pressure of the intermediate pressure cylinder drops to 85% of the alarm value, the high, medium and low pressure bypasses automatically enter the automatic state, and the bypass automatically closes according to the original logic.

[0018] As a preferred solution of the method for exhausting steam from a steam turbine heating pipeline according to the present invention, after the steam turbine is successfully switched to the extraction-condensing mode, gradually close the ELCV to reduce the steam intake of the heat network heater, and the specific opening is flexibly adjusted according to the hot water network water flow, so that the exhaust steam pressure of the intermediate pressure cylinder gradually returns to the control value.

[0019] As a preferred embodiment of the steam turbine heating pipeline exhaust method of the present invention, wherein: the rapid increase in the exhaust pressure of the intermediate pressure cylinder also requires a rapid reduction in the load of the gas turbine to reduce the steam inlet volume of the steam turbine; prepare for the steam turbine to switch to the extraction-condensing mode to further reduce the steam inlet volume of the heat network heater.

[0020] As a preferred embodiment of the steam turbine heating pipeline exhaust method of the present invention, wherein: reducing the exhaust pressure of the intermediate pressure cylinder also requires a large amount of steam to be discharged to the atmosphere through the exhaust electric valve of the heating extraction main pipe, significantly reducing the rising speed of the intermediate exhaust pressure and even starting to decline.

[0021] As a preferred embodiment of the steam turbine heating pipeline exhaust method of the present invention, wherein: reducing the exhaust pressure of the intermediate pressure cylinder also includes setting the high-pressure and intermediate-pressure bypass command to 30% and the low-pressure bypass command to 50%, and both exiting the automatic state.

[0022] As a preferred embodiment of the steam turbine heating pipeline exhaust device of the present invention, wherein: the main body assembly includes a generator, a high-pressure cylinder and an intermediate-pressure cylinder provided at one end of the generator, a bypass pipeline is provided in the high-pressure cylinder and the intermediate-pressure cylinder, and the bypass pipeline is used to open the high, medium and low-pressure bypass valves when the exhaust pressure of the intermediate pressure cylinder reaches a predetermined threshold; and,

[0023] The heating assembly includes a heating extraction main pipe provided at one end of the heat network heater, and an exhaust electric valve is provided on the heating extraction main pipe to automatically open when the heat network water system is abnormal.

[0024] As a preferred embodiment of the steam turbine heating pipeline exhaust device of the present invention, wherein: the main body assembly further includes a low-pressure cylinder provided on one side of the intermediate pressure cylinder of the main pipeline, a clutch is provided between the low-pressure cylinder and the intermediate pressure cylinder, and a condenser is installed at the bottom end of the low-pressure cylinder.

[0025] As a preferred embodiment of the steam turbine heating pipeline exhaust device of the present invention, wherein: the automatic opening logic of the exhaust electric valve in the heating extraction main pipe includes:

[0026] When the exhaust pressure of the intermediate pressure cylinder rises to 0.85 times the alarm value, the exhaust electric valve is automatically opened;

[0027] After the exhaust pressure of the intermediate pressure cylinder drops to 105% of the control value, the exhaust electric valve is automatically closed in series.

[0028] As a preferred embodiment of the steam turbine heating pipeline exhaust device of the present invention, wherein: the automatic opening logic of the bypass of the high-pressure cylinder, the intermediate-pressure cylinder and the low-pressure cylinder includes:

[0029] When the exhaust steam pressure of the intermediate pressure cylinder rises to the alarm value, and the unit is in back pressure state and the heat network water volume is less than or equal to 5000 t / h, the automatic interlock opening logic of the bypass pipelines on the high pressure cylinder, intermediate pressure cylinder and low pressure cylinder is triggered;

[0030] Among them, the bypass instructions for the high pressure cylinder and the intermediate pressure cylinder are set to 30%, and the bypass instructions for the low pressure cylinder are set to 50%, and both exit the automatic state

[0031] The beneficial effects of the present invention: By adding an exhaust steam electric valve to the heat supply extraction main pipe and configuring an automatic opening logic, when the abnormal heat network water system causes the exhaust steam pressure of the intermediate pressure cylinder to rise rapidly, the exhaust steam electric valve can be automatically opened when the exhaust steam pressure of the intermediate pressure cylinder reaches 0.85 times the alarm value, and a large amount of steam is directly discharged into the atmosphere, significantly reducing the rising speed of the intermediate pressure exhaust pressure and even causing it to start to decline. This helps to prevent the exhaust steam pressure of the intermediate pressure cylinder from exceeding the protection value, thereby preventing the steam turbine from tripping and the heat supply of the unit from being interrupted. By adding the automatic opening logic of the high, intermediate and low pressure bypasses of the steam turbine, when the heat network water system is abnormal and the exhaust steam pressure of the intermediate pressure cylinder continues to rise to the alarm value, the high, medium and low pressure bypass valves can be automatically opened to reduce the steam volume entering the steam turbine and further reduce the exhaust steam pressure of the intermediate pressure cylinder. This not only helps to relieve the pressure of the heat network heater, but also can effectively control the exhaust steam pressure of the intermediate pressure cylinder in a short time, improving the safety and stability of the unit operation.

[0032] Through the above technical means, the present invention can effectively address the problem of excessive exhaust steam pressure of the intermediate pressure cylinder caused by the abnormal heat network water system, ensure the safe and stable operation of the steam turbine under extreme conditions, avoid tripping accidents caused by high exhaust steam pressure of the intermediate pressure cylinder, and guarantee the normal heat supply and power supply of the unit. Brief Description of the Drawings

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0034] Figure 1 It is an overall schematic diagram of a steam turbine heat supply pipeline exhaust method and device.

[0035] Figure 2 It is a schematic diagram of the exhaust valve opening process of a steam turbine heat supply pipeline exhaust method and device.

[0036] Figure 3 It is a schematic diagram of the bypass input process of a steam turbine heat supply pipeline exhaust method and device.

[0037] Figure 4Schematic diagram of the frame structure of a steam exhaust method for a heating pipeline.

[0038] Reference numerals:

[0039] 100, main body assembly; 101, generator; 102, high-pressure cylinder; 103, intermediate-pressure cylinder; 104, bypass pipeline; 105, bypass valve; 106, heat network heater; 107, low-pressure cylinder; 108, clutch; 109, condenser;

[0040] 200, heating assembly; 201, heating extraction main pipe; 202, steam exhaust motorized valve. Specific implementation manners

[0041] To make the above objects, features and advantages of the present invention more obvious and understandable, the specific implementation manners of the present invention will be described in detail below with reference to the accompanying drawings of the specification.

[0042] Many specific details are set forth in the following description in order to fully understand the present invention, but the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar generalizations without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0043] Secondly, the so-called "one embodiment" or "embodiment" herein refers to a specific feature, structure or characteristic that may be included in at least one implementation manner of the present invention. The appearances of "in one embodiment" in different places in this specification do not all refer to the same embodiment, nor are they separate or alternative embodiments that exclude each other from other embodiments.

[0044] Thirdly, the present invention is described in detail with reference to the schematic diagrams. When describing the embodiments of the present invention in detail, for the convenience of explanation, the cross-sectional views showing the device structures will be enlarged locally not in accordance with the general ratio, and the schematic diagrams are only examples and should not limit the scope of protection of the present invention herein. In addition, in actual production, three-dimensional spatial dimensions including length, width and depth should be included.

[0045] Example 1, referring to Figure 1 , which is the first embodiment of the present invention. This embodiment provides a steam exhaust device for a steam turbine heating pipeline, including that through the main body assembly 100 and the heating assembly 200, the problem of excessive exhaust pressure of the intermediate-pressure cylinder 103 caused by the abnormality of the heat network water system can be effectively solved, ensuring the safe and stable operation of the steam turbine under extreme working conditions, avoiding the tripping accident caused by the high exhaust pressure of the intermediate-pressure cylinder 103, and guaranteeing the normal heating and power supply of the unit.

[0046] Specifically, the main body component 100 includes a generator 101, a high-pressure cylinder 102 and an intermediate-pressure cylinder 103 arranged at one end of the generator 101. A bypass pipeline 104 is arranged in the high-pressure cylinder 102 and the intermediate-pressure cylinder 103. The bypass pipeline 104 is used to automatically open the high, medium and low pressure bypass valves 105 when the exhaust pressure of the intermediate-pressure cylinder 103 reaches a predetermined threshold, reduce the amount of steam entering the heat network heater 106, and further reduce the exhaust pressure of the intermediate-pressure cylinder 103; and,

[0047] Furthermore, the heating component 200 includes a heating extraction main pipe 201 arranged at one end of the heat network heater 106. An exhaust electric valve 202 is arranged on the heating extraction main pipe 201 and is used to automatically open when the heat network water system is abnormal to reduce the exhaust pressure of the intermediate-pressure cylinder.

[0048] Furthermore, the main body component 100 further includes a low-pressure cylinder 107 arranged on one side of the intermediate-pressure cylinder 103 in the main pipeline. A clutch 108 is arranged between the low-pressure cylinder 107 and the intermediate-pressure cylinder 103, and a condenser 109 is installed at the bottom end of the low-pressure cylinder 107.

[0049] Example 2, referring to Figures 1 to 4 This is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that the automatic opening logic of the exhaust electric valve 202 in the heating extraction main pipe 201 includes:

[0050] Furthermore, when the exhaust pressure of the intermediate-pressure cylinder 103 rises to 0.85 times the alarm value, the exhaust electric valve 202 is automatically opened;

[0051] Furthermore, when the exhaust pressure of the intermediate-pressure cylinder 103 drops to 105% of the control value, the exhaust electric valve 202 is automatically closed in series to prevent excessive steam discharge from triggering the low protection trip of the intermediate exhaust pressure of the steam turbine.

[0052] Furthermore, the automatic opening logic of the bypasses of the high-pressure cylinder 102, the intermediate-pressure cylinder 103 and the low-pressure cylinder 107 includes:

[0053] When the exhaust pressure of the intermediate-pressure cylinder 103 rises to the alarm value, and the unit is in the back pressure state and the heat network water volume is less than or equal to 5000 t / h, the automatic joint opening logic of the bypass pipeline 104 on the high-pressure cylinder 102, the intermediate-pressure cylinder 103 and the low-pressure cylinder 107 is triggered;

[0054] Among them, the bypass instructions of the high-pressure cylinder 102 and the intermediate-pressure cylinder 103 are set to 30%, and the bypass instruction of the low-pressure cylinder 107 is set to 50%, and both exit the automatic state;

[0055] Furthermore, when the exhaust pressure of the intermediate-pressure cylinder 103 drops to 85% of the alarm value, the bypasses of the high-pressure cylinder 102, the intermediate-pressure cylinder 103 and the low-pressure cylinder 107 automatically enter the automatic state, and the bypasses are automatically closed according to the original logic.

[0056] Further, the control system includes:

[0057] A pressure sensor for detecting the exhaust pressure of the intermediate-pressure cylinder;

[0058] A flow sensor for detecting the flow rate of the heat supply network water system;

[0059] A control unit for controlling the opening and closing of the motorized valve and the bypass valve according to the detection results of the sensors and the preset logic.

[0060] The remaining structures are the same as those in Embodiment 1.

[0061] Embodiment 3, referring to Figures 1 to 4 , is the third embodiment of the present invention. The difference between this embodiment and the above embodiments is that this embodiment is the specific operation steps of the present invention, and the specific steps are as follows:

[0062] Step 1: When there is a large-area leakage in the heat supply network, the return water pressure of the heat supply network drops sharply, and the flow rate of the heat supply network water decreases rapidly, resulting in a rapid increase in the exhaust pressure of the intermediate-pressure cylinder. The load of the gas turbine is rapidly reduced to reduce the steam inlet volume of the steam turbine; Prepare for the steam turbine to switch to the extraction-condensing mode to further reduce the steam inlet volume of the heat supply network heater;

[0063] Step 2: When it is detected that the exhaust pressure of the intermediate-pressure cylinder rises to 0.85 times the alarm value, the motorized valve for exhausting steam from the heat supply extraction main pipe is automatically opened to reduce the exhaust pressure of the intermediate-pressure cylinder. A large amount of steam is discharged to the atmosphere through the motorized valve for exhausting steam from the heat supply extraction main pipe, significantly reducing the rising speed of the intermediate exhaust pressure and even starting to decline;

[0064] Step 3: If the exhaust pressure of the intermediate-pressure cylinder drops to 105% of the control value, the motorized valve for exhausting steam from the heat supply extraction main pipe is automatically closed in association;

[0065] Step 4: If the exhaust pressure of the intermediate-pressure cylinder continues to rise to the alarm value, and the unit is in the back pressure state and the heat supply network water volume is less than or equal to 5000 t / h, trigger the automatic associated opening logic of the high, medium, and low pressure bypasses to reduce the steam volume entering the heat supply network heater, and set the high and medium pressure bypass commands to 30% and the low pressure bypass command to 50%, and both exit the automatic state to reduce the steam volume entering the heat supply network heater and further reduce the exhaust pressure of the intermediate-pressure cylinder;

[0066] Step 5: When the exhaust pressure of the intermediate-pressure cylinder drops to 85% of the alarm value, the high, medium, and low pressure bypasses automatically enter the automatic state, and the bypasses are automatically closed according to the original logic.

[0067] Step 6: After the steam turbine successfully switches to the extraction-condensing mode, gradually close the ELCV to reduce the steam inlet volume of the heat supply network heater. The specific opening is adjusted flexibly according to the flow rate of the heat supply network water, so that the exhaust pressure of the intermediate-pressure cylinder gradually returns to near the control value.

[0068] The remaining structures are the same as those in Embodiment 2.

[0069] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A method for exhausting steam from a heating pipeline, characterized in that: include, Real-time monitoring of the heat network return water pressure and heat network water flow, and monitoring of the medium pressure cylinder exhaust steam pressure; When the exhaust steam pressure of the medium pressure cylinder drops to 105% of the preset control value, the electric exhaust door of the heating extraction steam main pipe will be automatically closed; The exhaust steam pressure of the medium pressure cylinder continues to rise to the preset alarm value, and the unit is in a back pressure state and the water volume of the heat network is less than or equal to 5000 tons / hour, triggering the automatic connection logic of the high, medium and low pressure bypass; When the exhaust steam pressure of the medium pressure cylinder drops to 85% of the preset alarm value, the high, medium and low pressure bypasses automatically return to the automatic state.

2. The method for exhausting steam from a heating pipeline according to claim 1, characterized in that: When it is detected that the exhaust steam pressure of the intermediate pressure cylinder rises to 0.85 times the alarm value, the electric exhaust door of the heating steam extraction main pipe is automatically opened to reduce the exhaust steam pressure of the intermediate pressure cylinder; When the exhaust steam pressure of the medium pressure cylinder drops to 105% of the control value, the electric exhaust door of the heating extraction steam main pipe will be automatically closed; When the exhaust steam pressure of the intermediate pressure cylinder continues to rise to the alarm value, and the unit is in a back pressure state and the water volume of the heating network is less than or equal to 5000t / h, the automatic connection logic of the high, medium and low pressure bypass is triggered to reduce the amount of steam entering the heating network heater and further reduce the exhaust steam pressure of the intermediate pressure cylinder; When the exhaust steam pressure of the medium pressure cylinder drops to 85% of the alarm value, the high, medium and low pressure bypasses are automatically put into automatic state, and the bypasses are automatically closed according to the original logic.

3. The method for exhausting steam from a heating pipeline according to claim 2, characterized in that: After the steam turbine is successfully switched to the extraction and condensing mode, the ELCV is gradually closed to reduce the steam inlet to the heating network heater. The specific opening is flexibly adjusted according to the water flow rate of the heating network so that the exhaust pressure of the intermediate pressure cylinder gradually returns to the control value.

4. The method for exhausting steam from a heating pipeline according to claim 3, characterized in that: The rapid rise in the exhaust pressure of the intermediate pressure cylinder requires that the load of the gas turbine be reduced rapidly to reduce the steam intake of the steam turbine; prepare the steam turbine to cut-out condensing mode to further reduce the steam intake of the heating network heater.

5. The method for exhausting steam from a heating pipeline according to claim 4, characterized in that: To reduce the exhaust pressure of the intermediate pressure cylinder, a large amount of steam needs to be released into the atmosphere through the exhaust electric door of the heating extraction steam main pipe, which can significantly reduce the rising speed of the intermediate exhaust pressure and even start it to decrease.

6. The method for exhausting steam from a heating pipeline according to claim 5, characterized in that: Lowering the exhaust steam pressure of the intermediate pressure cylinder also includes setting the high and medium pressure bypass instructions to 30%, setting the low pressure bypass instruction to 50%, and both exiting the automatic state.

7. A steam exhaust device for a steam turbine heating pipeline, characterized in that: The method for exhausting steam from a heating pipeline according to any one of claims 1 to 6 further comprises: A main assembly (100) comprises a generator (101), a high-pressure cylinder (102) and a medium-pressure cylinder (103) arranged at one end of the generator (101), a bypass pipeline (104) being arranged in the high-pressure cylinder (102) and the medium-pressure cylinder (103), and the bypass pipeline (104) is used to open high-pressure, medium-pressure and low-pressure bypass valves (105) when the exhaust pressure of the medium-pressure cylinder (103) reaches a predetermined threshold; and The heating component (200) comprises a heating steam extraction mother pipe (201) arranged at one end of the heating network heater (106), and the heating steam extraction mother pipe (201) is provided with an exhaust steam electric door (202) for automatically opening when the heating network water system is abnormal.

8. The steam exhaust device for the steam turbine heating pipeline according to claim 7, characterized in that: The main body assembly (100) further comprises a low-pressure cylinder (107) arranged on one side of the medium-pressure cylinder (103) in the main pipeline, a clutch (108) is arranged between the low-pressure cylinder (107) and the medium-pressure cylinder (103), and a condenser (109) is installed at the bottom end of the low-pressure cylinder (107).

9. The steam exhaust device for a steam turbine heating pipeline according to claim 8, characterized in that: The automatic opening logic of the exhaust steam electric door (202) in the heating steam extraction main pipe (201) includes: When the exhaust steam pressure of the intermediate pressure cylinder (103) rises to 0.85 times the alarm value, the exhaust steam electric door (202) is automatically opened; After the exhaust steam pressure of the medium pressure cylinder (103) drops to 105% of the control value, the exhaust steam electric door (202) is automatically closed.

10. The steam exhaust device for the steam turbine heating pipeline according to claim 9, characterized in that: The bypass automatic opening logic of the high pressure cylinder (102), the medium pressure cylinder (103) and the low pressure cylinder (107) includes: When the exhaust steam pressure of the intermediate pressure cylinder (103) rises to an alarm value, and the unit is in a back pressure state and the water volume of the heating network is less than or equal to 5000t / h, the automatic connection logic of the bypass pipeline (104) on the high pressure cylinder (102), the intermediate pressure cylinder (103) and the low pressure cylinder (107) is triggered; The bypass instructions of the high-pressure cylinder (102) and the medium-pressure cylinder (103) are set to 30%, and the bypass instruction of the low-pressure cylinder (107) is set to 50%, and both are out of the automatic state.

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