CN114658497A - Switching front-end control system and control method for steam extraction system of double-extraction back steam turbine - Google Patents
Switching front-end control system and control method for steam extraction system of double-extraction back steam turbine Download PDFInfo
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- CN114658497A CN114658497A CN202210198181.8A CN202210198181A CN114658497A CN 114658497 A CN114658497 A CN 114658497A CN 202210198181 A CN202210198181 A CN 202210198181A CN 114658497 A CN114658497 A CN 114658497A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/34—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating
- F01K7/38—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of extraction or non-condensing type; Use of steam for feed-water heating the engines being of turbine type
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Abstract
The invention provides a double-extraction-back steam turbine steam extraction system switching front-end control system and a control method, comprising a main steam passage, a high-pressure steam bypass, a low-pressure steam bypass, a high-pressure steam extraction pipeline and a low-pressure steam extraction pipeline; the main steam path is provided with a main steam pipeline, a high-pressure cylinder combined valve, a high-pressure cylinder of the steam turbine, a reheater cold section pipeline, a reheater hot section pipeline, an intermediate pressure cylinder combined valve, a steam turbine intermediate pressure cylinder with a built-in rotary partition plate and a back pressure exhaust pipeline; the high-pressure steam bypass is provided with a high-side valve and a high-side temperature and pressure reducer, the low-pressure steam bypass is communicated between the reheater hot section pipeline and the back pressure exhaust pipeline, and the low-pressure steam extraction pipeline is provided with a low-side valve and a low-side temperature and pressure reducer. The method and the device realize stable and orderly operation and quit of the high-pressure steam supply system and the low-pressure steam supply system of the double-extraction back-side combined heat and power generation steam turbine unit, and ensure safe starting and operation of the unit. The control method in the application realizes the switching control of the heating system.
Description
Technical Field
The invention relates to the technical field of cogeneration equipment, in particular to a switching front-end control system of a steam extraction system of a double-extraction back steam turbine. The invention also relates to a control method applied to the switching front-end control system of the double-extraction-back steam turbine steam extraction system.
Background
The whole starting process of the steam turbine refers to a debugging process of boiler ignition in the first combined starting of a furnace, a machine, electricity and the like until a unit finishes full-load reliability trial run transfer production. The main purposes of the process include checking the starting and stopping operation and control functions of a steam turbine unit control system, checking the accuracy and reliability of the actions of a safety protection system of the unit, checking the starting reasonability, maneuverability and safety of the unit, optimizing the starting parameters and starting modes of the unit and the like.
For the steam extraction and heat supply unit, the investment and the removal of the steam extraction and heat supply working condition are also one of the very important links. The reasonable and effective implementation scheme provides practical guarantee for safe starting of the unit, subsequent stable operation and key equipment protection.
However, a control system and a control method for performing sequential switching-in and switching-out on each steam supply pipeline of the double-extraction back pressure steam turbine are lacked in the market.
Disclosure of Invention
The invention provides a switching front-end control system of a double-extraction back-pressure steam turbine steam extraction system, which realizes sequential input and cut-off of each steam supply pipeline of a double-extraction back-pressure steam turbine, effectively ensures stable transition and conversion of a double-extraction back-pressure steam turbine set from a pure power generation working condition to a high-low pressure steam supply working condition, and ensures safe start and safe operation of the set. In addition, the invention also provides a control method applied to the switching front-end control system of the double-extraction back steam turbine extraction system.
The invention provides a switching front-end control system of a steam extraction system of a double-extraction back steam turbine, which comprises a main steam passage, a high-pressure steam bypass, a low-pressure steam bypass, a high-pressure steam extraction pipeline and a low-pressure steam extraction pipeline;
the main steam passage comprises a main steam pipeline, a high-pressure cylinder combined valve, a steam turbine high-pressure cylinder, a reheater cold section pipeline, a reheater hot section pipeline, an intermediate pressure cylinder combined valve, a steam turbine intermediate pressure cylinder and a backpressure exhaust pipeline which are sequentially arranged along the gas flowing direction, and a rotary partition plate is rotatably installed in the steam turbine intermediate pressure cylinder;
the high-pressure steam bypass is communicated between the main steam pipeline and the reheater cold section pipeline and comprises a high bypass valve and a high bypass temperature and pressure reducing device which are sequentially arranged along the gas flowing direction;
the low-pressure steam bypass is communicated between the reheater hot section pipeline and the back pressure exhaust pipeline and comprises a low bypass valve and a low bypass temperature and pressure reducing device which are sequentially arranged along the gas flowing direction;
the high-pressure steam extraction pipeline is arranged on the reheater hot section pipeline, and a high-pressure steam extraction valve is arranged on the high-pressure steam extraction pipeline;
the low-pressure steam extraction pipeline is arranged between the reheater hot section pipeline and the backpressure exhaust pipeline, and a low side valve and a low side temperature and pressure reducer are sequentially arranged on the low-pressure steam extraction pipeline along the airflow direction.
Preferably, the rotating partition plate is rotatably installed inside the steam turbine intermediate pressure cylinder by being driven by a motor.
Preferably, the steam turbine high-pressure cylinder and the steam turbine intermediate-pressure cylinder are connected with the generator by using a main shaft.
In addition, the invention also provides a double-extraction back steam turbine extraction system switching front end control method, which is applied to any one of the double-extraction back steam turbine extraction system switching front end control systems, and comprises a low-pressure steam supply pipeline, a high-pressure steam supply pipeline and a low-pressure steam supply pipeline;
the input low-pressure steam supply pipeline comprises the following steps: adjusting the intermediate pressure cylinder combined steam valve and the low side valve to enable the pressure in front of the intermediate pressure cylinder combined steam valve to be higher than the low-pressure steam extraction pressure, closing the opening of the rotary partition plate, and slowly opening the low-pressure steam extraction valve on the low-pressure steam extraction pipeline to supply low-pressure steam to the outside when the low-pressure steam supply pressure reaches a specified level; the low-pressure steam pressure is controlled by utilizing the intermediate pressure cylinder combined valve;
the input high-pressure steam supply pipeline comprises the following steps: gradually closing the low side valve to stabilize the high-pressure steam extraction pressure at a given value, and manually and slowly opening the high-pressure steam extraction valve to supply high-pressure steam to the outside; after the high-pressure steam and the low-pressure steam start to be supplied, controlling the rotary clapboard to maintain the back pressure and the exhaust pressure;
the cutting off of the high-pressure steam supply pipeline comprises the following steps: releasing the limitation that the rotary partition plate maintains the back pressure exhaust steam pressure, and manually controlling the opening of the rotary partition plate; start of cut supply of high pressure steam: on the premise of maintaining the high-pressure steam supply pressure, slowly closing a high-pressure steam extraction valve on the high-pressure steam supply pipeline to reduce the air supply quantity of high-pressure steam, and simultaneously controlling the low-pressure steam supply pressure to keep a constant value by using the combined steam valve of the intermediate pressure cylinder and the low side valve until the high-pressure steam extraction valve is completely closed;
the cutting of the low-pressure steam supply pipeline comprises the following steps: on the premise of maintaining the low-pressure steam supply pressure, slowly closing a low-pressure steam extraction valve on the low-pressure steam supply pipeline, and simultaneously slowly opening a low bypass valve to reduce the low-pressure steam supply amount; and maintaining the opening degree of the combined valve of the intermediate pressure cylinder, manually opening the rotary partition plate to a full-open position when the low-pressure steam extraction valve is completely closed, and controlling the back pressure exhaust pressure by adjusting the opening degree of the low side valve.
Preferably, in the step of putting in the low-pressure steam supply line, when the low bypass valve is fully closed and the low-pressure steam supply pressure is not satisfied, the opening degree of the high-pressure cylinder combined valve is increased.
Preferably, in the step of gradually closing the low side valve to stabilize the high-pressure extraction pressure at the given value, when the low side valve is completely closed and the high-pressure extraction pressure is not stabilized at the given value, the opening degree of the high-pressure cylinder combined valve is increased to stabilize the high-pressure extraction pressure at the given value.
Compared with the prior art, the switching front-end control system of the steam extraction system of the double-extraction back steam turbine provided by the invention has the following technical advantages:
1. the double-extraction back steam turbine unit realizes the stable transition and conversion from the pure power generation working condition to the high-low pressure steam supply working condition, and provides an effective way and practical guarantee for the safe starting and operation of the unit and the protection of key equipment.
2. The input and the cut-off of the double-extraction back steam turbine steam supply system are realized, and the switching control of the double-extraction back steam turbine steam supply system is realized.
3. By utilizing the front-end control scheme, the transient response speed is high, the working condition switching efficiency is high, the coordination mode among the devices is simple, and the operability is good.
In addition, the invention also provides a switching front-end control method of the double-extraction-back steam turbine extraction system, which effectively ensures the whole set of starting of the double-extraction-back steam turbine set and provides effective guarantee for the operation switching between the steam supply working conditions of the double-extraction-back steam turbine set.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic diagram of a switching front-end control system of a double extraction back steam turbine extraction system provided by the invention.
The system comprises a main steam pipeline, a 2-high-pressure cylinder combined valve, a 3-steam turbine high-pressure cylinder, a 4-reheater cold section pipeline, a 5-reheater, a 6-reheater hot section pipeline, a 7-intermediate-pressure cylinder combined valve, an 8-steam turbine intermediate-pressure cylinder, a 9-rotary partition plate, a 10-backpressure exhaust pipeline, an 11-high side valve, a 12-high side temperature and pressure reducer, a 13-low side valve, a 14-low side temperature and pressure reducer, a 15-generator, a 16-high-pressure steam extraction valve and a 17-low-pressure steam extraction valve, wherein the main steam pipeline is connected with the reheater cold section pipeline in a pipeline mode.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1, fig. 1 is a schematic diagram of a switching front-end control system of an extraction system of a double extraction back steam turbine according to the present invention.
The invention provides a switching front-end control system of a steam extraction system of a double-extraction back steam turbine, which mainly comprises a main steam passage, a high-pressure steam bypass, a low-pressure steam bypass, a high-pressure steam extraction pipeline and a low-pressure steam extraction pipeline.
The main steam pipeline 1, the high-pressure cylinder combined valve 2, the steam turbine high-pressure cylinder 3, the reheater cold section pipeline 4, the reheater 5, the reheater hot section pipeline 6, the intermediate pressure cylinder combined valve 7, the steam turbine intermediate pressure cylinder 8 and the backpressure exhaust pipeline 10 form a main steam passage, all the parts are sequentially arranged along the gas flowing direction, a rotary partition plate 9 is installed in the steam turbine intermediate pressure cylinder 8, and the rotary partition plate 9 is rotatably installed inside the steam turbine intermediate pressure cylinder 8.
The high-pressure steam bypass is directly communicated with the main steam pipeline 1 and the reheater cold section pipeline 4 and is arranged between the two pipelines, and the high-side valve 11 and the high-side temperature and pressure reducing device 12 are sequentially connected to form the high-pressure steam bypass.
The low-pressure steam bypass is directly communicated with the reheater hot section pipeline 6 and the backpressure exhaust pipeline 10 and is arranged between the two pipelines, and the low-side valve 13 and the low-side temperature and pressure reducing device 14 are sequentially connected to form the low-pressure steam bypass.
The reheater hot section pipeline 6 is provided with a high pressure steam extraction pipeline with a high pressure steam extraction valve 16, and the turbine intermediate pressure cylinder 8 is connected with a low pressure steam extraction pipeline with a low pressure steam extraction valve 17 and located at the front end of the rotary partition plate 9.
When low-pressure steam supply is input, the intermediate pressure cylinder combined steam valve 7 and the low side valve 13 are adjusted in a matched mode, the pressure in front of the intermediate pressure cylinder combined steam valve 7 is higher than the low-pressure steam extraction pressure, the opening degree of the rotary partition plate 9 is reduced, then low-pressure steam is supplied to the outside by opening the low-pressure steam extraction valve 17 on the low-pressure steam extraction pipeline, the low-pressure steam pressure is controlled by using the intermediate pressure cylinder combined steam valve 7, and the low-pressure steam supply pressure can be met by opening the large high-pressure cylinder combined steam valve 2.
When the high-pressure steam supply pipeline is put into use, the low side valve 13 is gradually closed to enable the high-pressure steam extraction pressure to be stabilized at a given value, and then the high-pressure steam extraction valve 16 is manually and slowly opened to supply high-pressure steam to the outside. After the high-pressure and low-pressure steam starts to be supplied, the rotary partition plate 9 is controlled to maintain the back pressure exhaust pressure.
When the low-pressure steam supply pipeline is cut off, the low-pressure steam extraction valve 17 is slowly closed, and simultaneously, the low-side valve 13 is slowly opened, so that the low-pressure steam supply quantity is gradually reduced.
When the high-pressure steam supply pipeline is cut off, the opening degree of the rotary partition plate 9 is manually adjusted, the high-pressure steam extraction 16 is slowly closed to reduce the supply amount of the high-pressure steam, and meanwhile, the low-pressure steam supply pressure is controlled to keep a constant value by adjusting the combined steam valve 7 of the intermediate pressure cylinder and the low side valve 13 until the high-pressure steam extraction valve 16 is completely closed, so that the high-pressure steam supply is cut off.
The double-extraction-back steam turbine steam extraction system switching front end control system in the application is characterized in that high-pressure and low-pressure steam extraction pipelines are arranged at the front ends of rotary partition plates 9 of a reheater hot section pipeline 6 and a steam turbine intermediate pressure cylinder 8 respectively, and steam is supplied to the outside. The actions of the high-pressure cylinder combined steam valve 2, the high side valve 11, the intermediate-pressure cylinder combined steam valve 7, the low side valve 13 and the rotary partition plate 9 are coordinately controlled, so that the control of the input and cut-off front ends of a steam supply system is realized, and the stable transition and conversion of the double-extraction back steam turbine set from a pure power generation working condition to a high-pressure and low-pressure steam supply working condition are realized, and an effective way and practical guarantee are provided for the safe starting and operation of the set and the protection of key equipment.
In order to realize the automatic control of the opening of the rotating partition 9, a motor may be disposed on the top of the rotating partition 9, the motor is connected to the rotating partition 9, and the rotating partition 9 installed inside the steam turbine intermediate pressure cylinder 8 is driven by the motor to rotate, thereby automatically adjusting the opening of the rotating partition 9.
In addition, the turbine high-pressure cylinder 3 and the turbine intermediate-pressure cylinder 8 are connected with the generator 15 by using a main shaft, so that the conversion from steam heat energy to mechanical energy to electric energy is realized.
This application realizes supplying vapour system to drop into and amputate front end control through the action of each steam valve of coordinated control, each valve and rotatory baffle, realizes that two take out back of the body steam turbine group by the steady transition of pure electricity generation operating mode to high-low pressure steam supply operating mode.
The invention also provides a switching front end control method of the double-extraction back steam turbine steam extraction system, which is applied to the switching front end control system of the double-extraction back steam turbine steam extraction system and comprises a low-pressure steam supply pipeline, a high-pressure steam supply pipeline and a low-pressure steam supply pipeline.
The input and cut-off steam extraction system adopts a front end control method, and the input low-pressure steam supply pipeline is implemented according to the following steps:
firstly, the intermediate pressure cylinder combined valve 7 and the low side valve 13 are adjusted in a matching manner, so that the pressure in front of the intermediate pressure cylinder combined valve 7 is higher than the low-pressure steam extraction pressure, then the opening degree of the rotary partition plate 9 is reduced, and when the low-pressure steam supply pressure reaches a specified level, the low-pressure steam extraction valve 17 on the low-pressure steam extraction pipeline is slowly opened to supply low-pressure steam to the outside; thereafter, the low pressure steam pressure is controlled by the intermediate pressure cylinder in conjunction with the valve 7.
When a high-pressure steam supply pipeline is put into use, the method is implemented according to the following steps:
firstly, gradually closing the low side valve 13 to stabilize the high-pressure steam extraction pressure at a given value; then, manually and slowly opening the high-pressure steam extraction valve 16 to supply high-pressure steam to the outside; finally, after the high-pressure and low-pressure steam starts to be supplied, the rotary partition plate 9 is controlled to maintain the back pressure exhaust pressure.
The process of cutting off the steam supply is different from the reverse process of the throwing process. The method comprises the following steps:
firstly, the limitation on the back pressure exhaust steam pressure maintained by the rotary partition plate 9 is released, and the opening degree of the rotary partition plate 9 is manually controlled; then, the supply of high-pressure steam is started to be cut off: on the premise of maintaining the high-pressure steam supply pressure, the high-pressure steam extraction valve 16 on the high-pressure steam supply pipeline is slowly closed, the air supply quantity of the high-pressure steam is reduced, meanwhile, the low-pressure steam supply pressure is controlled to keep a constant value by using the intermediate cylinder combined steam valve 7 and the low side valve 13 until the high-pressure steam extraction valve 16 is completely closed, and the high-pressure steam supply cut-off is completed.
When the low-pressure steam supply pipeline is cut off, the method is implemented according to the following steps:
firstly, on the premise of maintaining the low-pressure steam supply pressure, slowly closing a low-pressure steam extraction valve 17 on a low-pressure steam supply pipeline, and simultaneously slowly opening a low-side valve 13 to reduce the low-pressure steam supply quantity; finally, the opening degree of the intermediate cylinder combination valve 7 is maintained, and the back pressure and exhaust pressure is controlled by adjusting the opening degree of the low side valve 13.
The switching front-end control method for the double back extraction steam turbine steam extraction system provided by the application realizes stable and orderly operation and quitting of the high-pressure steam supply system and the low-pressure steam supply system of the double back extraction cogeneration steam turbine unit, and ensures efficient operation of the system.
In the step of putting into the low pressure steam supply line, considering that the high pressure steam extraction pressure is not stabilized to the given value if the low side valve 13 is completely closed, the opening degree of the high pressure cylinder combined steam valve 2 may be increased to stabilize the high pressure steam extraction pressure to the given value.
The method comprises the following steps: and gradually closing the low side valve 13 to stabilize the high-pressure steam extraction pressure in a given value, and opening the opening degree of the large high-pressure cylinder combined valve 2 to stabilize the high-pressure steam extraction pressure in the given value when the high-pressure steam extraction pressure is not stabilized to the given value when the low side valve 13 is completely closed.
It is noted that, in this specification, relational terms such as first and second, and the like are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.
The switching front-end control system and the control method of the steam extraction system of the double-extraction back steam turbine provided by the invention are introduced in detail. The principles and embodiments of the present invention have been described herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present invention. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (6)
1. A switching front-end control system of a steam extraction system of a double-extraction back steam turbine is characterized by comprising a main steam passage, a high-pressure steam bypass, a low-pressure steam bypass, a high-pressure steam extraction pipeline and a low-pressure steam extraction pipeline;
the main steam passage comprises a main steam pipeline (1), a high-pressure cylinder combined valve (2), a steam turbine high-pressure cylinder (3), a reheater cold section pipeline (4), a reheater (5), a reheater hot section pipeline (6), an intermediate pressure cylinder combined valve (7), a steam turbine intermediate pressure cylinder (8) and a backpressure exhaust pipeline (10), which are sequentially arranged along the gas flowing direction, and a rotary partition plate (9) is rotatably mounted in the steam turbine intermediate pressure cylinder (8);
the high-pressure steam bypass is communicated between the main steam pipeline (1) and the reheater cold section pipeline (4), and comprises a high bypass valve (11) and a high bypass temperature and pressure reducing device (12) which are sequentially arranged along the gas flowing direction;
the low-pressure steam bypass is communicated between the reheater hot section pipeline (6) and the back pressure exhaust pipeline (10), and comprises a low-side valve (13) and a low-side temperature and pressure reducing device (14) which are sequentially arranged along the gas flowing direction;
the high-pressure steam extraction pipeline is arranged on the reheater hot section pipeline (6), and a high-pressure steam extraction valve (16) is arranged on the high-pressure steam extraction pipeline;
the low-pressure steam extraction pipeline is arranged between the reheater hot section pipeline (6) and the back pressure exhaust pipeline (10), and a low side valve (13) and a low side temperature and pressure reducer (14) are sequentially arranged on the low-pressure steam extraction pipeline along the air flow direction.
2. The double extraction steam turbine extraction system switching front end control system according to claim 1, wherein the rotary partition (9) is rotatably mounted inside the steam turbine intermediate pressure cylinder (8) by being driven by a motor.
3. The double extraction steam turbine extraction system switching front end control system according to claim 1, wherein the steam turbine high pressure cylinder (3) and the steam turbine intermediate pressure cylinder (8) are connected with the generator (15) by a main shaft.
4. A double extraction back steam turbine extraction system switching front end control method is applied to the double extraction back steam turbine extraction system switching front end control system of any one of the claims 1-3, and is characterized by comprising the steps of putting a low-pressure steam supply pipeline, putting a high-pressure steam supply pipeline, cutting a high-pressure steam supply pipeline and cutting a low-pressure steam supply pipeline;
the input low-pressure steam supply pipeline comprises the following steps: adjusting a middle pressure cylinder combined valve (7) and a low side valve (13) to enable the pressure in front of the middle pressure cylinder combined valve (7) to be higher than the low-pressure extraction pressure; the opening degree of the rotary partition plate (9) is reduced, and when the low-pressure steam supply pressure reaches a specified level, a low-pressure steam extraction valve (17) on a low-pressure steam extraction pipeline is slowly opened to supply low-pressure steam to the outside; the low-pressure steam pressure is controlled by the intermediate pressure cylinder combined valve (7);
the input high-pressure steam supply pipeline comprises the following steps: gradually closing the low side valve (13) to stabilize the high-pressure steam extraction pressure at a given value, and manually and slowly opening the high-pressure steam extraction valve (16) to supply high-pressure steam to the outside; after high-pressure and low-pressure steam starts to be supplied, the rotary clapboard (9) is controlled to maintain the back pressure exhaust pressure;
the cutting off of the high-pressure steam supply pipeline comprises the following steps: the limitation that the rotary partition plate (9) maintains the back pressure steam exhaust pressure is released, and the opening of the rotary partition plate (9) is manually controlled; start of cut supply of high pressure steam: on the premise of maintaining the high-pressure steam supply pressure, slowly closing a high-pressure steam extraction valve (16) on a high-pressure steam supply pipeline to reduce the supply amount of high-pressure steam, and simultaneously controlling the low-pressure steam supply pressure to keep a constant value by using the intermediate cylinder combined steam valve (7) and the low side valve (13) until the high-pressure steam extraction valve (16) is completely closed;
the cutting of the low-pressure steam supply pipeline comprises the following steps: on the premise of maintaining the low-pressure steam supply pressure, slowly closing a low-pressure steam extraction valve (17) on a low-pressure steam supply pipeline, and simultaneously slowly opening a low side valve (13) to reduce the low-pressure steam supply amount; and maintaining the opening degree of the combined valve (7) of the intermediate pressure cylinder, manually opening the rotary partition plate (9) to a full-open position when the low-pressure steam extraction valve (17) is completely closed, and controlling the back pressure exhaust pressure by adjusting the opening degree of the low side valve (13).
5. The switching front-end control method of the extraction system of a double extraction back steam turbine according to claim 4, characterized in that in the step of putting into the low-pressure steam supply pipeline, when the low bypass valve (13) is fully closed and the low-pressure steam supply pressure is not satisfied, the opening degree of the large-high-pressure cylinder combined valve (2) is opened.
6. The switching front-end control method of a double extraction back steam turbine extraction system according to claim 5, characterized in that in the step of gradually closing the low side valve (13) to stabilize the high pressure extraction pressure at a given value, when the low side valve (13) is completely closed and the high pressure extraction pressure is not stabilized at the given value, the opening degree of the high pressure cylinder combined valve (2) is increased to stabilize the high pressure extraction pressure at the given value.
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