Steam pipe heating system

Abstract

The embodiment of the present invention provides a steam pipe heating system, comprising: a temperature and pressure detection device for detecting the steam temperature and pressure of the steam pipe; a steam flow regulating device for regulating the flow of steam entering or discharged from the steam pipe; and a control device for regulating the flow of steam entering or discharged from the steam pipe by controlling the steam flow regulating device according to the steam temperature and pressure detected by the temperature and pressure detection device. This solution can reduce the labor intensity of pipe heating operation and improve the pipe heating effect.

Description

Technical Field

[0001] The invention relates to the technical field of steam pipes, and in particular to a steam pipe heating system. Background Art

[0002] Pipe warming refers to the process of slowly adding steam to a cold steam pipe over a certain period of time to increase the temperature and pressure of the steam pipe and discharge condensate, ultimately making the temperature of the steam pipe consistent with that of the steam.

[0003] Before the steam turbine is started, the steam pipe between the boiler outlet isolation valve and the main steam valve of the steam turbine needs to be warmed up. At present, the on-site operators usually adjust the opening of the steam pipe bypass valve manually based on their experience to warm up the steam pipe. This warming operation method has the problems of high labor intensity and poor warming effect. Summary of the invention

[0004] The purpose of the embodiment of the present invention is to provide a steam pipe heating system to reduce the labor intensity of pipe heating operation and improve the pipe heating effect. The specific technical solution is as follows:

[0005] An embodiment of the present invention provides a steam pipe heating system, comprising:

[0006] Temperature and pressure detection device, used to detect the steam temperature and pressure of the steam pipeline;

[0007] A steam flow regulating device, used to regulate the flow of steam entering or exiting the steam pipeline;

[0008] The control device is used to adjust the flow rate of steam entering or discharged from the steam pipeline by controlling the steam flow regulating device according to the steam temperature and pressure detected by the temperature and pressure detecting device.

[0009] Optionally, the steam pipeline includes a pipe gallery steam pipeline and a station steam pipeline; the pipe gallery steam pipeline is a steam pipeline between the boiler outlet isolation valve and the turbine inlet isolation valve; the station steam pipeline is a steam pipeline between the turbine inlet isolation valve and the turbine main steam valve;

[0010] The temperature and pressure detection device includes a pipe gallery temperature and pressure detection device arranged on the pipe gallery steam pipeline and an in-station temperature and pressure detection device arranged on the in-station steam pipeline.

[0011] Optionally, the steam flow regulating device includes an inlet flow control device and a first drain exhaust device;

[0012] The inlet flow control device is used to adjust the steam flow entering the pipe gallery steam pipeline and the steam pipeline in the station;

[0013] The first drain and exhaust device is used to discharge condensed water and steam in the steam pipeline of the pipeline gallery and the steam pipeline in the station.

[0014] Optionally, the inlet flow control device includes: a first pipe gallery bypass loop provided on the pipe gallery steam pipeline and connected in parallel with the boiler outlet isolation valve, and a first main steam bypass loop provided on the station steam pipeline and connected in parallel with the turbine inlet isolation valve; regulating valves are provided on both the first pipe gallery bypass loop and the main steam bypass loop;

[0015] The control device is specifically used to adjust the steam flow entering the gallery steam pipeline by controlling the opening of the regulating valve on the first gallery bypass loop according to the steam temperature and pressure detected by the gallery temperature and pressure detection device; after completing the heating of the gallery steam pipeline, the steam flow entering the steam pipeline in the station is adjusted by controlling the opening of the regulating valve on the first main steam bypass loop according to the steam temperature and pressure detected by the temperature and pressure detection device in the station.

[0016] Optionally, the system further includes N first isolation valves arranged at intervals on the pipe gallery steam pipeline for dividing the pipe gallery steam pipeline into N+1 sections of the first pipeline, and N first bypass loops connecting two adjacent sections of the first pipeline and connected in parallel with the first isolation valves; wherein a regulating valve is arranged on each first bypass loop;

[0017] The number of the pipe gallery temperature and pressure detection devices is N+1, and one pipe gallery temperature and pressure detection device is provided on each section of the first pipeline;

[0018] The control device is specifically used to adjust the steam flow entering each of the first pipelines by controlling the opening of the regulating valve corresponding to the first pipeline according to the steam temperature and pressure detected by the pipe gallery temperature and pressure detection device arranged on the first pipeline.

[0019] Optionally, the steam flow regulating device includes a steam inlet control device and a second drain exhaust device;

[0020] The steam inlet control device is used to control the steam to enter the steam pipeline in the pipe gallery and the steam pipeline in the station;

[0021] The second drain and exhaust device is used to discharge condensed water in the pipe gallery steam pipeline and the steam pipeline in the station and to adjust the flow rate of steam discharged from the pipe gallery steam pipeline and the steam pipeline in the station.

[0022] Optionally, the second drain and exhaust device includes a second pipe gallery drain and exhaust assembly provided on the pipe gallery steam pipeline and a second main steam drain and exhaust assembly provided on the steam pipeline in the station;

[0023] The second pipe gallery drain and exhaust assembly includes a second pipe gallery drain and exhaust pipeline and a regulating valve arranged on the second pipe gallery drain and exhaust pipeline;

[0024] The second main steam drain exhaust assembly includes a second main steam drain exhaust pipeline and a regulating valve arranged on the second main steam drain exhaust pipeline;

[0025] The control device is specifically used to adjust the steam flow entering the gallery steam pipeline by controlling the opening of the regulating valve in the second gallery drain and exhaust assembly according to the steam temperature and pressure detected by the gallery temperature and pressure detection device; after completing the heating of the gallery steam pipeline, the steam flow entering the steam pipeline in the station is adjusted by controlling the opening of the regulating valve in the second main steam drain and exhaust assembly according to the steam temperature and pressure detected by the temperature and pressure detection device in the station.

[0026] Optionally, the system further includes N second isolation valves arranged at intervals on the pipe gallery steam pipeline to divide the pipe gallery steam pipeline into N+1 sections of second pipelines; the second drain and exhaust device further includes N second drain and exhaust assemblies; the second pipe gallery drain and exhaust assembly is arranged on the second pipe gallery connected to the boiler outlet isolation valve, and one second drain and exhaust assembly is arranged on each of the other second pipes; the second drain and exhaust assembly includes a second drain and exhaust pipeline and a regulating valve arranged on the second drain and exhaust pipeline;

[0027] The number of the pipe gallery temperature and pressure detection devices is N+1, and one pipe gallery temperature and pressure detection device is provided on each section of the second pipeline;

[0028] The control device is specifically used to adjust the steam flow entering each second pipeline by controlling the opening of a regulating valve on a second drain and exhaust pipeline connected to the second pipeline according to the steam temperature and pressure detected by a pipe gallery temperature and pressure detection device arranged on the second pipeline.

[0029] Optionally, the temperature and pressure detection device includes a thermocouple for detecting the temperature of steam in the steam pipe and a pressure transmitter for detecting the steam pressure in the steam pipe.

[0030] Optionally, the regulating valve includes an electric regulating valve or a pneumatic regulating valve.

[0031] The steam pipe heating system provided in the embodiment of the present invention can automatically realize the pipe heating operation of the steam pipe by controlling the steam flow regulating device to adjust the flow of steam entering or exhausting the steam pipe according to the steam temperature and pressure detected by the temperature and pressure detecting device, accurately control the steam flow entering or exhausting the steam pipe, effectively reduce the labor intensity of the pipe heating operation, and improve the pipe heating effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0033] Figure 1 A schematic structural diagram of a first steam pipe heating system provided by an embodiment of the present invention;

[0034] Figure 2 A schematic structural diagram of a second steam pipe heating system provided by an embodiment of the present invention;

[0035] Figure 3 A schematic structural diagram of a third steam pipe heating system provided in an embodiment of the present invention;

[0036] Figure 4 A schematic structural diagram of a fourth steam pipe heating system provided in an embodiment of the present invention.

[0037] The descriptions of the numbers in the figure are as follows:

[0038] 11—pipe gallery steam pipeline, 111—first pipeline, 112—second pipeline, 12—station steam pipeline; 13—boiler outlet isolation valve, 14—turbine inlet isolation valve, 15—turbine main steam valve;

[0039] 21—Temperature and pressure detection device in the pipe gallery, 22—Temperature and pressure detection device in the station;

[0040] 30—regulating valve, 301—electric valve, 302—manual valve;

[0041] 311—first pipe gallery bypass loop, 312—first main steam bypass loop;

[0042] 321—first pipe gallery drain and exhaust assembly, 322—first drain and exhaust assembly, 323—first main steam drain and exhaust assembly;

[0043] 33—first isolation valve, 331—first bypass circuit;

[0044] 341—Second pipe gallery bypass loop, 342—Second main steam bypass loop;

[0045] 351—second pipe gallery drain and exhaust assembly, 352—second drain and exhaust assembly, 353—second main steam drain and exhaust assembly;

[0046] 36—second isolation valve, 361—second bypass circuit. DETAILED DESCRIPTION

[0047] The technical solution of the embodiment of the present invention is described below in conjunction with the accompanying drawings in the embodiment of the present invention.

[0048] In order to reduce the labor intensity of pipe heating operation and improve the pipe heating effect, an embodiment of the present invention provides a steam pipe heating system.

[0049] An embodiment of the present invention provides a steam pipe heating system, comprising:

[0050] Temperature and pressure detection device, used to detect the steam temperature and pressure of the steam pipeline;

[0051] A steam flow regulating device, used to regulate the flow of steam entering or exiting the steam pipeline;

[0052] The control device is used to adjust the flow rate of steam entering or discharged from the steam pipeline by controlling the steam flow regulating device according to the steam temperature and pressure detected by the temperature and pressure detecting device.

[0053] The embodiment of the present invention does not limit the specific structure of the temperature and pressure detection device. The temperature and pressure detection device can use a discrete detection device that collects the steam temperature and pressure of the steam pipeline respectively, or an integrated detection device that integrates the temperature and pressure collection functions. The temperature and pressure detection device transmits the collected temperature and pressure information to the control device, thereby controlling the operation of the steam flow regulating device.

[0054] The steam flow regulating device is used to control the flow of the steam pipeline. The embodiment of the present invention proposes two ways of regulating the flow of steam entering or exiting the steam pipeline, which can effectively control the flow of the steam pipeline. In order to make the layout and scheme clear, the steam flow regulating device will be described in detail later.

[0055] The control device is electrically connected to the temperature and pressure detection device and the steam flow regulating device respectively, and controls the steam flow regulating device through the received steam temperature and pressure signals, thereby automatically controlling the temperature rise rate and pressure rise rate of the steam pipeline.

[0056] The steam pipe heating system provided in the embodiment of the present invention can automatically realize the pipe heating operation of the steam pipe by controlling the steam flow regulating device to adjust the flow of steam entering or exhausting the steam pipe according to the steam temperature and pressure detected by the temperature and pressure detecting device, accurately control the steam flow entering or exhausting the steam pipe, effectively reduce the labor intensity of the pipe heating operation, and improve the pipe heating effect.

[0057] Optional, such as Figure 1 and Figure 3As shown, the steam pipeline includes a pipe gallery steam pipeline 11 and a station steam pipeline 12; the pipe gallery steam pipeline 11 is a steam pipeline between a boiler outlet isolation valve 13 and a turbine inlet isolation valve 14; the station steam pipeline 12 is a steam pipeline between a turbine inlet isolation valve 14 and a turbine main steam valve 15;

[0058] The temperature and pressure detection device includes a pipe gallery temperature and pressure detection device 21 arranged on the pipe gallery steam pipeline 11 and an in-station temperature and pressure detection device 22 arranged on the in-station steam pipeline 12 .

[0059] It should be noted that in the steam turbine power generation system that generates electricity through steam, the steam pipeline includes not only the steam pipeline 12 in the steam turbine power station, but also the steam pipeline 11 in the pipe gallery for steam transportation. In order to effectively warm the steam pipeline, a boiler outlet isolation valve 13 and a turbine inlet isolation valve 14 are provided on the steam pipeline, wherein the steam pipeline between the boiler outlet isolation valve 13 and the turbine inlet isolation valve 14 is recorded as the pipe gallery steam pipeline 11; the steam pipeline between the turbine inlet isolation valve 14 and the turbine main steam valve 15 is recorded as the steam pipeline 12 in the station. Correspondingly, in order to detect the steam temperature and pressure in the pipe gallery steam pipeline 11 and the steam pipeline 12 in the station, a pipe gallery temperature and pressure detection device 21 and a station temperature and pressure detection device 22 are respectively provided on the pipe gallery steam pipeline 11 and the steam pipeline 12 in the station.

[0060] Optionally, the steam flow regulating device includes an inlet flow control device and a first drain exhaust device;

[0061] The inlet flow control device is used to adjust the steam flow entering the pipe gallery steam pipeline 11 and the station steam pipeline 12;

[0062] The first drain and exhaust device is used to discharge condensed water and steam in the pipe gallery steam pipeline 11 and the station steam pipeline 12.

[0063] In the embodiment of the present invention, the control device automatically controls the inlet flow control device in the steam flow regulating device to control the steam flow entering the steam pipe; the first drain exhaust device is only used to discharge condensed water and steam in the steam pipe.

[0064] Optional, such as Figure 1 As shown, the inlet flow control device includes: a first pipe gallery bypass loop 311 arranged on the pipe gallery steam pipeline 11 and connected in parallel with the boiler outlet isolation valve 13, and a first main steam bypass loop 312 arranged on the station steam pipeline 12 and connected in parallel with the turbine inlet isolation valve 14; regulating valves 30 are arranged on both the first pipe gallery bypass loop 311 and the main steam bypass loop 312;

[0065] The control device is specifically used to adjust the steam flow entering the gallery steam pipe 11 by controlling the opening of the regulating valve 30 on the first gallery bypass loop 311 according to the steam temperature and pressure detected by the gallery temperature and pressure detection device 21; after completing the heating of the gallery steam pipe 11, the steam flow entering the steam pipe 12 in the station is adjusted by controlling the opening of the regulating valve 30 on the first main steam bypass loop 312 according to the steam temperature and pressure detected by the temperature and pressure detection device 22 in the station.

[0066] The regulating valve 30 may include an electric regulating valve or a pneumatic regulating valve, and the regulating valve 30 may realize precise flow control.

[0067] The first pipe gallery bypass loop 311 and the main steam bypass loop 312 can be provided with an electric valve 301 and a manual valve 302. After the pipe warming is completed, the electric valve 301 can automatically close the bypass loop under the control of the control device; the manual valve 302 is a normally open valve and is closed only during maintenance. The manual valve 302 can facilitate the maintenance of the regulating valve 30 and the electric valve 301.

[0068] In addition, the first drain and exhaust device in the embodiment of the present invention includes: a first pipe gallery drain and exhaust assembly 321 arranged on the pipe gallery steam pipeline 11 and a first main steam drain and exhaust assembly 323 arranged on the station steam pipeline 12. The first pipe gallery drain and exhaust assembly 321 is used to discharge condensed water and steam in the pipe gallery steam pipeline 11; the first main steam drain and exhaust assembly 323 is used to discharge condensed water and steam in the station steam pipeline 12. The electric valve 301 and the manual valve 302 can be set on the first pipe gallery drain and exhaust assembly 321 and the first main steam drain and exhaust assembly 323.

[0069] It is understandable that before warming up the pipe, the isolation valve on the steam pipe is closed, and the steam pipe is warmed up by controlling the regulating valve on the bypass loop. After the pipe is warmed up, according to the needs of the subsequent process, the isolation valve on the steam pipe is opened and the regulating valve on the bypass pipe is closed.

[0070] The embodiment of the present invention realizes automatic regulation of the steam flow entering the steam pipe by arranging a regulating valve electrically connected to the control device on the bypass loop of the steam pipe, which can accurately control the steam flow entering the steam pipe and effectively improve the pipe heating effect.

[0071] Optional, such as Figure 2As shown, considering that in actual applications, the length of the pipe gallery steam pipeline 11 may be particularly long, in order to improve the pipe heating effect of the pipe gallery steam pipeline 11, the system also includes N first isolation valves 33 arranged at intervals on the pipe gallery steam pipeline 11, which are used to divide the pipe gallery steam pipeline 11 into N+1 sections of the first pipeline 111, and N first bypass loops 331 connecting two adjacent sections of the first pipeline 111 and connected in parallel with the first isolation valve 33; wherein a regulating valve 30 is arranged on each first bypass loop 331;

[0072] The number of the pipe gallery temperature and pressure detection devices 21 is N+1, and one pipe gallery temperature and pressure detection device 21 is provided on each section of the first pipeline 111;

[0073] The control device is specifically used to adjust the steam flow entering each first pipeline 111 by controlling the opening of the regulating valve 30 corresponding to the first pipeline 111 according to the steam temperature and pressure detected by the pipeline gallery temperature and pressure detection device 21 set on the first pipeline 111, for each first pipeline 111.

[0074] It is understandable that the number of the first isolation valves 33 is determined according to the actual length of the pipe gallery steam pipeline 11, and is at least one. Figure 4 The number of the first isolation valves 33 is two.

[0075] The first bypass circuit 331 may be provided with an electric valve 301 and a manual valve 302 .

[0076] In addition, it should be noted that the first drain and exhaust device in the embodiment of the present invention further includes N first drain and exhaust assemblies 322; the first pipe gallery drain and exhaust assembly 321 is provided in the first pipe 111 connected to the boiler outlet isolation valve 13, and the remaining first pipes 111 are respectively provided with one first drain and exhaust assembly 322. The first drain and exhaust assembly 322 is used to discharge condensed water and steam in the other first pipes 111 except the first pipe 111 connected to the boiler outlet isolation valve 13. The electric valve 301 and the manual valve 302 can be provided on the first drain and exhaust assembly 322.

[0077] In the steam pipe heating system provided in an embodiment of the present invention, a control device warms up the first pipe 111 connected to the boiler outlet isolation valve 13 by controlling the opening of the regulating valve 30 on the first pipe gallery bypass loop 311 according to the steam temperature and pressure detected by the pipe gallery temperature and pressure detection device 21 on the first pipe 111 connected to the boiler outlet isolation valve 13; after completing the warming up of the first pipe 111 connected to the boiler outlet isolation valve 13, the remaining first pipes 111 are warmed up in turn by controlling the opening of the regulating valve 30 on the first bypass loop 331 according to the steam temperature and pressure detected by the pipe gallery temperature and pressure detection device 21 on the remaining first pipes 111; after completing the warming up of all the first pipes 111, the steam pipe 12 in the station is warmed up by controlling the opening of the regulating valve 30 on the first main steam bypass loop 312 according to the steam temperature and pressure detected by the internal temperature and pressure detection device 22.

[0078] The embodiment of the present invention divides the pipe gallery steam pipeline 11 into multiple sections of first pipelines 111 through multiple first isolation valves 33, and warms up each first pipeline 111 in turn, so as to quickly and fully warm up the steam pipeline.

[0079] Optionally, the steam flow regulating device includes a steam inlet control device and a second drain exhaust device;

[0080] The steam inlet control device is used to control the steam to enter the pipe gallery steam pipeline 11 and the station steam pipeline 12;

[0081] The second drain and exhaust device is used to discharge condensed water in the pipe gallery steam pipeline 11 and the station steam pipeline 12 and to adjust the flow rate of steam discharged from the pipe gallery steam pipeline 11 and the station steam pipeline 12.

[0082] In the embodiment of the present invention, the second drain and exhaust device is automatically controlled by the control device to control the steam flow rate discharged from the steam pipeline, and the steam inlet control device is only used to allow steam to enter the steam pipeline.

[0083] Optional, such as Figure 3 As shown, the second drain and exhaust device includes a second pipe gallery drain and exhaust assembly 351 arranged on the pipe gallery steam pipeline 11 and a second main steam drain and exhaust assembly 353 arranged on the in-station steam pipeline 12;

[0084] The second pipe gallery drain and exhaust assembly 351 includes a second pipe gallery drain and exhaust pipeline and a regulating valve 30 disposed on the second pipe gallery drain and exhaust pipeline;

[0085] The second main steam drain exhaust assembly 353 includes a second main steam drain exhaust pipeline and a regulating valve 30 disposed on the second main steam drain exhaust pipeline;

[0086] The control device is specifically used to adjust the steam flow entering the gallery steam pipe 11 by controlling the opening of the regulating valve 30 in the second gallery drain and exhaust assembly 351 according to the steam temperature and pressure detected by the gallery temperature and pressure detection device 21; after completing the heating of the gallery steam pipe 11, the steam flow entering the steam pipe 12 in the station is adjusted by controlling the opening of the regulating valve 30 in the second main steam drain and exhaust assembly 353 according to the steam temperature and pressure detected by the temperature and pressure detection device 22 in the station.

[0087] In addition, the steam inlet control device in the embodiment of the present invention includes: a second pipe gallery bypass loop 341 arranged on the pipe gallery steam pipeline 11 and connected in parallel with the boiler outlet isolation valve 13, and a second main steam bypass loop 342 arranged on the in-station steam pipeline 12 and connected in parallel with the turbine inlet isolation valve 14.

[0088] The second pipe gallery bypass loop 341 and the second main steam bypass loop 342 can be provided with an electric valve 301 and a manual valve 302. After the pipe warming is completed, the electric valve 301 can automatically close the bypass loop under the control of the control device, and the manual valve 302 is a normally open valve and is only closed during maintenance. The manual valve 302 can facilitate the maintenance of the electric valve 301.

[0089] It is understandable that before warming up the pipe, the isolation valve on the steam pipe is closed, and the steam pipe is warmed up by controlling the regulating valve on the drain and exhaust pipe. After warming up the pipe, according to the needs of the subsequent process, the isolation valve on the steam pipe is opened and the regulating valve on the drain and exhaust pipe is closed.

[0090] The embodiment of the present invention realizes automatic regulation of the steam flow rate of the exhaust steam pipe through the regulating valve electrically connected to the control device in the hydrophobic exhaust assembly, and can accurately control the steam flow rate of the exhaust steam pipe, thereby effectively improving the pipe heating effect.

[0091] It should be noted that the drain and exhaust pipe is used to discharge condensed water and steam in the steam pipe, and it can be an integral structure or a split structure. The drain and exhaust pipe with an integral structure has only one pipe, which can discharge both condensed water and steam in the steam pipe; the drain and exhaust pipe with a split structure includes two pipes, one of which is used to discharge condensed water in the steam pipe, and the other is used to discharge steam in the steam pipe.

[0092] Optionally, the second pipe gallery drain and exhaust pipeline may include a second pipe gallery drain pipeline and a second pipe gallery exhaust pipeline; the regulating valve 30 arranged on the pipe gallery drain and exhaust pipeline is specifically arranged on the pipe gallery exhaust pipeline;

[0093] The second main steam drain exhaust pipe may include a second main steam drain pipe and a second main steam exhaust pipe; the regulating valve 30 arranged on the main steam drain exhaust pipe is specifically arranged on the second main steam exhaust pipe.

[0094] The electric valve 301 and the manual valve 302 can be provided on the second pipe gallery drain and exhaust assembly 351 and the second main steam drain and exhaust assembly 353. The electric valve 301 can automatically close the second pipe gallery drain and exhaust pipeline and the second main steam drain and exhaust pipeline under the control of the control device; the manual valve 302 is a normally open valve and is closed only during maintenance. The manual valve 302 can facilitate the maintenance of the regulating valve 30 and the electric valve 301.

[0095] Optional, such as Figure 4 As shown, considering that in actual applications, the length of the pipe gallery steam pipeline 11 may be particularly long, in order to improve the pipe heating effect of the pipe gallery steam pipeline 11, the system also includes N second isolation valves 36 arranged at intervals on the pipe gallery steam pipeline 11 to divide the pipe gallery steam pipeline 11 into N+1 sections of second pipelines 112;

[0096] The second drain and exhaust device further includes N second drain and exhaust components 352; the second pipe gallery drain and exhaust component 351 is provided in the second pipe 112 connected to the boiler outlet isolation valve 13, and the remaining second pipes 112 are respectively provided with a second drain and exhaust component 352; the second drain and exhaust component 352 includes a second drain and exhaust pipe and a regulating valve 30 provided on the second drain and exhaust pipe;

[0097] The number of the pipe gallery temperature and pressure detection devices 21 is N+1, and one pipe gallery temperature and pressure detection device 21 is provided on each section of the second pipeline 112;

[0098] The control device is specifically used to adjust the steam flow entering each second pipeline 112 by controlling the opening of the regulating valve 30 on the second drain exhaust pipeline connected to the second pipeline 112 according to the steam temperature and pressure detected by the pipeline gallery temperature and pressure detection device 21 set on the second pipeline 112.

[0099] It is understandable that the number of the second isolation valves 36 is determined according to the actual length of the pipe gallery steam pipeline 11, and is at least one. Figure 4 The number of the second isolation valves 36 is two.

[0100] The second drain and exhaust assembly 352 may be provided with an electric valve 301 and a manual valve 302 .

[0101] In addition, the system also includes N second bypass loops 361 connecting two adjacent sections of the second pipeline 112 and connected in parallel with the second isolation valve 36; an electric valve 301 and a manual valve 302 can be set on the second bypass loop 361; after the pipe heating is completed, the electric valve 301 can automatically close the bypass loop under the control of the control device, and the manual valve 302 is closed during maintenance, which can facilitate the maintenance of the steam pipeline, regulating valve and electric valve.

[0102] In the steam pipe heating system provided by the embodiment of the present invention, the control device completes the pipe heating of the second pipe 112 connected to the boiler outlet isolation valve 13 by controlling the opening of the regulating valve 30 in the second pipe gallery drain and exhaust assembly 351 according to the steam temperature and pressure detected by the pipe gallery temperature and pressure detection device 21 on the second pipe 112 connected to the boiler outlet isolation valve 13; after completing the pipe heating of the second pipe 112 connected to the boiler outlet isolation valve 13, according to the steam temperature and pressure detected by the pipe gallery temperature and pressure detection device 21 on the remaining second pipes 112, the opening of the regulating valve in the second drain and exhaust assembly 352 is controlled to complete the pipe heating of the remaining second pipes 112 in turn; after completing the pipe heating of all the second pipes 112, according to the steam temperature and pressure detected by the temperature and pressure detection device 22 in the station, the opening of the regulating valve 30 in the second main steam drain and exhaust assembly 353 is controlled to complete the pipe heating of the steam pipe 12 in the station.

[0103] The embodiment of the present invention divides the pipe gallery steam pipeline 11 into multiple sections of second pipelines 112 through multiple second isolation valves 36, and warms up each second pipeline 112 in turn, so as to quickly and fully warm up the steam pipeline.

[0104] Optionally, similar to the second pipe gallery drain and exhaust pipe and the second main steam drain and exhaust pipe of the above-mentioned split structure, the second drain and exhaust pipe may include a second drain pipe and a second exhaust pipe, and the regulating valve 30 arranged on the second drain and exhaust pipe is specifically arranged on the second exhaust pipe.

[0105] Optionally, the temperature and pressure detection device includes a thermocouple for detecting the temperature of steam in the steam pipe and a pressure transmitter for detecting the steam pressure in the steam pipe.

[0106] Among them, thermocouples are commonly used temperature measuring elements in temperature measuring instruments. They directly measure temperature and convert temperature signals into thermoelectric potential signals, which are then converted into the temperature of the measured medium through electrical instruments. Pressure transmitters refer to pressure sensors with standard output signals. They are instruments that accept pressure variables and convert them into standard output signals in proportion. Thermocouples and pressure transmitters are widely used, and their specific structures belong to the prior art, so they will not be described here.

[0107] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A steam pipe heating system, characterized in that: include: A temperature and pressure detection device, used for detecting the steam temperature and pressure of a steam pipeline; the steam pipeline comprises a pipe gallery steam pipeline (11) and an in-station steam pipeline (12); the temperature and pressure detection device comprises a pipe gallery temperature and pressure detection device (21) arranged on the pipe gallery steam pipeline (11) and an in-station temperature and pressure detection device (22) arranged on the in-station steam pipeline (12); A steam flow regulating device, used for regulating the flow of steam entering or exiting the steam pipeline; the steam flow regulating device comprises an inlet flow control device; the inlet flow control device is used for regulating the flow of steam entering the pipe gallery steam pipeline (11) and the steam pipeline (12) in the station; The inlet flow control device comprises: a first pipe gallery bypass loop (311) arranged on the pipe gallery steam pipeline (11) and connected in parallel with the boiler outlet isolation valve (13), and a first main steam bypass loop (312) arranged on the station steam pipeline (12) and connected in parallel with the turbine inlet isolation valve (14); regulating valves (30) are arranged on both the first pipe gallery bypass loop (311) and the first main steam bypass loop (312); A control device, configured to adjust the steam flow rate entering the pipe gallery steam pipeline (11) by controlling the opening of the regulating valve (30) on the first pipe gallery bypass loop (311) according to the steam temperature and pressure detected by the pipe gallery temperature and pressure detection device (21); and after completing the pipe warming of the pipe gallery steam pipeline (11), adjust the steam flow rate entering the steam pipeline (12) in the station by controlling the opening of the regulating valve (30) on the first main steam bypass loop (312) according to the steam temperature and pressure detected by the station temperature and pressure detection device (22); After the pipe warming is completed, the boiler outlet isolation valve (13) and the turbine inlet isolation valve (14) on the steam pipeline are opened, and the regulating valves (30) on the first pipe gallery bypass loop (311) and the first main steam bypass loop (312) are closed.

2. The system according to claim 1, characterized in that The pipe gallery steam pipeline (11) is a steam pipeline between the boiler outlet isolation valve (13) and the turbine inlet isolation valve (14); the station steam pipeline (12) is a steam pipeline between the turbine inlet isolation valve (14) and the turbine main steam valve (15).

3. The steam pipe heating system according to claim 2, characterized in that: The steam flow regulating device also includes a first drain and exhaust device; The first drain and exhaust device is used to discharge condensed water and steam in the pipe gallery steam pipeline (11) and the station steam pipeline (12).

4. The steam pipe heating system according to claim 1, characterized in that: The system further comprises N first isolation valves (33) arranged at intervals on the pipe gallery steam pipeline (11) and used to divide the pipe gallery steam pipeline (11) into N+1 sections of first pipelines (111), and N first bypass loops (331) connecting two adjacent sections of the first pipeline (111) and connected in parallel with the first isolation valves (33); wherein a regulating valve (30) is arranged on each first bypass loop (331); The number of the pipe gallery temperature and pressure detection devices (21) is N+1, and one pipe gallery temperature and pressure detection device (21) is provided on each section of the first pipeline (111); The control device is specifically used to adjust the steam flow entering each first pipeline (111) by controlling the opening of a regulating valve (30) corresponding to the first pipeline (111) according to the steam temperature and pressure detected by a pipe gallery temperature and pressure detection device (21) provided on the first pipeline (111), with respect to the first pipeline (111).

5. The steam pipe heating system according to claim 2, characterized in that: The steam flow regulating device includes a steam inlet control device and a second drain exhaust device; The steam inlet control device is used to control the steam to enter the pipe gallery steam pipeline (11) and the station steam pipeline (12); The second drain and exhaust device is used to discharge condensed water in the pipe gallery steam pipeline (11) and the station steam pipeline (12) and to adjust the flow rate of steam discharged from the pipe gallery steam pipeline (11) and the station steam pipeline (12).

6. The steam pipe heating system according to claim 5, characterized in that: The second drain and exhaust device comprises a second pipe gallery drain and exhaust assembly (351) arranged on the pipe gallery steam pipeline (11) and a second main steam drain and exhaust assembly (353) arranged on the in-station steam pipeline (12); The second pipe gallery drain and exhaust assembly (351) comprises a second pipe gallery drain and exhaust pipeline and a regulating valve (30) arranged on the second pipe gallery drain and exhaust pipeline; The second main steam drain exhaust assembly (353) comprises a second main steam drain exhaust pipeline and a regulating valve (30) arranged on the second main steam drain exhaust pipeline; The control device is specifically used to adjust the steam flow entering the pipe gallery steam pipeline (11) by controlling the opening of the regulating valve (30) in the second pipe gallery drain and exhaust assembly (351) according to the steam temperature and pressure detected by the pipe gallery temperature and pressure detection device (21); after completing the pipe warming of the pipe gallery steam pipeline (11), the steam flow entering the station steam pipeline (12) is adjusted by controlling the opening of the regulating valve (30) in the second main steam drain and exhaust assembly (353) according to the steam temperature and pressure detected by the station temperature and pressure detection device (22).

7. The steam pipe heating system according to claim 6, characterized in that: The system further comprises N second isolation valves (36) arranged at intervals on the pipe gallery steam pipe (11) to divide the pipe gallery steam pipe (11) into N+1 sections of second pipes (112); the second drain and exhaust device further comprises N second drain and exhaust assemblies (352); the second pipe (112) connected to the boiler outlet isolation valve (13) is provided with the second pipe gallery drain and exhaust assembly (351), and the remaining second pipes (112) are each provided with a second drain and exhaust assembly (352); the second drain and exhaust assembly (352) comprises a second drain and exhaust pipe and a regulating valve (30) arranged on the second drain and exhaust pipe; The number of the pipe gallery temperature and pressure detection devices (21) is N+1, and one pipe gallery temperature and pressure detection device (21) is provided on each section of the second pipeline (112); The control device is specifically used to adjust the steam flow entering each second pipeline (112) by controlling the opening of a regulating valve (30) on a second drain and exhaust pipeline connected to the second pipeline (112) based on the steam temperature and pressure detected by a pipe gallery temperature and pressure detection device (21) provided on the second pipeline (112).

8. The steam pipe heating system according to claim 1, characterized in that: The temperature and pressure detection device comprises a thermocouple for detecting the temperature of steam in the steam pipeline and a pressure transmitter for detecting the steam pressure in the steam pipeline.

9. The steam pipe heating system according to any one of claims 1 to 8, characterized in that: The regulating valve (30) comprises an electric regulating valve or a pneumatic regulating valve.

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