CN112412553B - Multistage flexible heat supply system for two back pressing machines and control method - Google Patents

Multistage flexible heat supply system for two back pressing machines and control method Download PDF

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CN112412553B
CN112412553B CN202011290911.4A CN202011290911A CN112412553B CN 112412553 B CN112412553 B CN 112412553B CN 202011290911 A CN202011290911 A CN 202011290911A CN 112412553 B CN112412553 B CN 112412553B
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steam
valve group
pipeline
heat supply
steam pipeline
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CN112412553A (en
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王兴
裴东升
王伟锋
赵杰
雷少博
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Xian Thermal Power Research Institute Co Ltd
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Xian Thermal Power Research Institute Co Ltd
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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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/16—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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type
    • F01K7/22—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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being only of turbine type the turbines having inter-stage steam heating
    • 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
    • F01K7/16—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 only of turbine type
    • F01K7/22—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 only of turbine type the turbines having inter-stage steam heating
    • F01K7/24—Control or safety means specially adapted therefor
    • 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
    • F01K7/345—Control or safety-means particular thereto
    • 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
    • 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
    • F01K7/44—Use of steam for feed-water heating and another purpose
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D19/00—Details
    • F24D19/10—Arrangement or mounting of control or safety devices
    • F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
    • F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
    • F24D19/1015—Arrangement or mounting of control or safety devices for water heating systems for central heating using a valve or valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system
    • F24D3/1058—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks ; Hydraulic components of a central heating system disposition of pipes and pipe connections

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Control Of Turbines (AREA)

Abstract

The invention discloses a multistage flexible heat supply system and a control method for two back presses. Then, during non-heating seasons, heat exchange is carried out between steam turbine exhaust and a heat supply network to provide domestic hot water; during the heating season, the reheated steam after being decompressed can be selectively used for domestic heat supply, the heat supply amount can be adjusted in real time along with the opening degree of the valve group, the domestic heat requirements of different periods of the whole year are effectively met, and the mode is simple to operate, has good heat supply flexibility and adaptability, does not newly increase other large-scale equipment and is low in cost. The invention has wide application range, can flexibly meet the diversified demands of heat users, has lower cost and can be used for industrial steam supply and domestic heat supply units.

Description

Multistage flexible heat supply system for two back pressing machines and control method
Technical Field
The invention belongs to the technical field of back press heat supply, and particularly relates to a multistage flexible heat supply system and a control method for two back presses.
Background
With the continuous improvement of the industrial production level and the quality of people's life in China, the total quantity demand and the quality requirement of industrial steam supply and heat supply for residents' life are also increased more and more. The back pressure type steam turbine is adopted to carry out 'cogeneration', can meet the requirements of industrial enterprises on steam and electricity utilization, is an important measure for reasonably utilizing energy and ensuring the high efficiency and safety of industrial production and life. However, most of the conventional back pressure turbines cannot provide various steam parameters for steam supply, and the unit capable of providing multi-stage steam supply has the problems of complex design, low efficiency and the like, and when the steam consumption of a certain stage is large, the flexibility and the heat supply capacity of the system are required to be improved.
At present, a design scheme for two-stage heat supply through coaxial connection of two back pressing machines is provided, for example, chinese patent with publication number CN109653818a and publication number 4 month 19 in 2019 discloses a two-stage back pressing machine reheating steam extraction heat supply system and method. The main process flow core part of the invention adopts a high-pressure back-pressure machine and a low-pressure back-pressure machine to supply heat, the high-pressure back-pressure machine is used for extracting partial steam from a reheating steam outlet pipe so as to realize the function of high-pressure steam supply, the steam exhaust of the low-pressure back-pressure machine is used for meeting the requirement of low-pressure steam supply, and simultaneously the utilization efficiency of heat energy can be improved. On one hand, the low-pressure steam provided by the steam-heating device comes from the low-pressure back-pressure machine for steam exhaust, and the steam temperature is relatively low, so that the heat load requirements of some users for low pressure and high temperature cannot be met; on the other hand, the scheme mainly considers two industrial steam supplies with different parameters, and does not consider the aspect of domestic heat supply, but the domestic heat supply and the heat supply are the problems that the heat supply unit is mainly considered and cannot be ignored. In summary, for the heat supply unit, there is no heat supply system of back pressure machine which can simultaneously consider industrial steam supply and domestic heat supply, meet various heat parameter requirements, and is simple and flexible to adjust.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the problems in the prior art, the two back pressure steam turbine systems and the control method are high in applicability and flexibility and capable of meeting various industrial steam supply and domestic heat supply requirements.
In order to solve the technical problems, the invention adopts the technical scheme that:
a multi-stage flexible heat supply system for two back presses comprises: the system comprises a boiler, a first back pressure steam turbine, a generator, a clutch and a second back pressure steam turbine;
the first back pressure turbine, the generator, the clutch and the second back pressure turbine are sequentially and coaxially connected;
the multistage flexible heat supply system of two back press still include:
the steam inlet end of the first steam pipeline is connected with the steam outlet end of the boiler, and the steam outlet end of the first steam pipeline is connected with the steam inlet end of the first back pressure steam turbine;
the steam inlet end of the second steam pipeline is connected with the steam outlet end of the first back pressure turbine, and the steam outlet end of the second steam pipeline is connected with the third steam pipeline and the fourth steam pipeline respectively;
a steam inlet end of the third steam pipeline is connected with a steam outlet end of the second steam pipeline, and the steam outlet end provides industrial steam with a parameter I for a heat user;
a steam inlet end of the fourth steam pipeline is connected with a steam outlet end of the second steam pipeline, and the steam outlet end of the fourth steam pipeline is connected with a steam inlet end of a reheater of the boiler;
a steam inlet end of the fifth steam pipeline is connected with a steam outlet end of a reheater of the boiler, and the steam outlet end of the fifth steam pipeline is respectively connected with the sixth steam pipeline and the seventh steam pipeline;
a steam inlet end of the sixth steam pipeline is connected with a steam outlet end of the fifth steam pipeline, and the steam outlet end of the sixth steam pipeline is connected with a steam inlet end of the second back pressure turbine;
a steam inlet end of the seventh steam pipeline is connected with a steam outlet end of the fifth steam pipeline, and the steam outlet end of the seventh steam pipeline is respectively connected with the eighth steam pipeline and the ninth steam pipeline;
the steam inlet end of the eighth steam pipeline is connected with the steam outlet end of the seventh steam pipeline, and the steam outlet end provides industrial steam with a parameter two for a heat user;
a ninth steam pipeline, wherein a steam inlet end of the ninth steam pipeline is connected with a steam outlet end of the seventh steam pipeline, and a steam outlet end of the ninth steam pipeline is connected with a tenth steam pipeline;
a tenth steam pipeline, wherein the steam inlet end of the tenth steam pipeline is connected with the steam outlet end of the second back pressure steam turbine, and the steam outlet end of the tenth steam pipeline is connected with the first heat exchanger;
the heat supply network circulating water pipeline is provided with a first heat exchanger.
In a further development of the invention, the reheater is arranged between the fourth steam line and the fifth steam line, and the reheater is arranged in the boiler.
The invention has the further improvement that the two back press multi-parameter heating systems further comprise: and the main steam combined steam valve is arranged on the first steam pipeline and is close to one side of the steam inlet end of the first back pressure steam turbine.
The invention has the further improvement that the two back press multi-parameter heating systems further comprise: first valve group and first pressure reducer, first valve group sets up third steam conduit, and be located first pressure reducer preceding, first pressure reducer sets up third steam conduit, and be located behind the first valve group.
The invention is further improved in that the two back press multi-parameter heating systems further comprise: the second valve group is arranged in the seventh steam pipeline and is positioned in front of the second pressure reducer; the second pressure reducer is arranged in the seventh steam pipeline and is positioned behind the second valve group.
The invention has the further improvement that the two back press multi-parameter heating systems further comprise: and the third valve group is arranged on the sixth steam pipeline and is positioned in front of the steam inlet end of the second back-pressure steam turbine.
The invention is further improved in that the two back press multi-parameter heating systems further comprise: and the fourth valve group is arranged on the eighth steam pipeline.
The invention is further improved in that the two back press multi-parameter heating systems further comprise: and the fifth valve group is arranged on the ninth steam pipeline.
The invention is further improved in that the two back press multi-parameter heating systems further comprise: and the third pressure reducer is arranged in the ninth steam pipeline and is positioned behind the fifth valve group.
A control method of a multistage flexible heat supply system of two back presses comprises the following steps:
in non-heating seasons, the unit simultaneously provides industrial steam with a first parameter and industrial steam with a second parameter and domestic heat supply, the clutch is kept in a joint state, the fifth valve group is closed, the first valve group, the second valve group, the third valve group and the fourth valve group are opened, and the opening of the valve is adjusted according to heat requirements; after the hot steam at the steam exhaust end of the boiler works in a first back pressure turbine, a part of steam is decompressed by a first decompressor and then provides industrial steam with a first parameter for a heat user, and the rest steam enters the steam inlet end of a reheater and is secondarily heated; one part of the heated reheated steam is reduced in pressure through a second pressure reducer, and the other part of the reheated steam enters a first heat exchanger to heat supply network circulating water after acting through a second back pressure turbine; the reheated steam depressurized by the second pressure reducer passes through a fourth valve group to provide industrial steam with a second parameter for a heat user; the hot net circulating water cold water is heated to 80-130 ℃ through a first heat exchanger and then is used as a heat source to provide domestic hot water;
in a non-heating season, when the demand of a hot user for industrial steam supply of a parameter I changes, the clutch is kept in a joint state, the first valve group, the second valve group, the third valve group and the fourth valve group are opened, the fifth valve group is closed, and the opening degree of the first valve group is adjusted to be larger or smaller according to the change situation of the demand, so that the industrial steam supply of the parameter I is adjusted, and the purposes of flexible heat supply and quick response are achieved;
in the non-heating season, when the industrial steam supply demand of the second parameter is changed by a hot user, the clutch is kept in a joint state, the first valve group, the second valve group, the third valve group and the fourth valve group are opened, the fifth valve group is closed, and the opening degrees of the second valve group and the fourth valve group are adjusted to be larger or smaller according to the change situation of the demand, so that the industrial steam supply of the second parameter is adjusted, and the purposes of flexible heat supply and quick response are achieved;
in non-heating seasons, when the demand of a hot user for domestic heat supply changes, the clutch is kept in a joint state, the first valve group, the second valve group, the third valve group and the fourth valve group are opened, the fifth valve group is closed, and the opening degree of the third valve group is adjusted to be larger or smaller according to the change situation of the demand, so that the domestic heat supply is adjusted, and the purposes of flexible heat supply and quick response are achieved;
in the heating season, when the demand of the hot user for domestic heating and heating is increased, the clutch is kept in the engaged state, and the first valve group, the second valve group, the third valve group, the fourth valve group and the fifth valve group are started; the opening of the fifth valve group is adjusted according to the change condition of the demand, a part of reheated steam which is depressurized by the second pressure reducer is mixed with exhaust steam of the second back pressure turbine, the temperature of the hot end of the first heat exchanger is raised, and the heat exchange effect is enhanced, so that the domestic heat supply load is improved, and the purposes of flexible heat supply and quick response are achieved;
in the heating season, when the domestic heating and heating requirements of a hot user reach peak values, the clutch is kept in a separated state, the third valve group is closed, and cylinder cutting of the second back pressure steam turbine is carried out; the second valve group and the fifth valve group are kept to be fully opened, meanwhile, the opening degrees of the first valve group and the fourth valve group are reduced, at the moment, all fluid at the hot end of the first heat exchanger is reheated steam after pressure reduction, the heat exchange quantity reaches a peak value, and the life heat supply with the maximum load is preferentially provided.
The invention has at least the following beneficial technical effects:
the invention provides a multistage flexible heat supply system and a control method for two back presses, firstly, two kinds of industrial steam with different parameters are provided for users to select, the requirements of different industrial users can be met, the two kinds of industrial steam supply quantity can be adjusted in real time by operating a valve set according to actual requirements, and the operation is simple and flexible. Then, during non-heating seasons, heat exchange is carried out by adopting steam turbine exhaust and a heat supply network to provide domestic hot water; during the heating season, can selectively be used for the life heat supply with reheat steam after the decompression, and the heat supply load can be adjusted along with the aperture of valve group in real time, effectively satisfies the life heat demand of the not same period of whole year, and this mode easy operation has good heat supply flexibility and adaptability on the one hand, and on the other hand does not newly increase other main equipments, low cost. The invention has wide application range, can flexibly meet the diversified demands of heat users, has lower cost, can be used for industrial steam supply and domestic heat supply units, improves the heat supply flexibility of the units, and more quickly and efficiently matches the demands of different heat users.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
Description of reference numerals:
1. the steam generator comprises a boiler, a first back-pressure steam turbine, a generator, a second back-pressure steam turbine, a clutch, a 5, a second back-pressure steam turbine, a 6, a first steam pipeline, a 7, a main steam combined steam valve, a 8, a second steam pipeline, a 9, a first valve group, a 10, a first pressure reducer, a 11, a third steam pipeline, a 12, a fourth steam pipeline, a 13, a reheater, a 14, a fifth steam pipeline, a 15, a sixth steam pipeline, a 16, a third valve group, a 17, a second valve group, a 18, a second pressure reducer, a 19, a seventh steam pipeline, a 20, a fourth valve group, a 21, an eighth steam pipeline, a 22, a fifth valve group, a 23, a ninth steam pipeline, a 24, a tenth steam pipeline, a 25, a first heat exchanger, a 26 and a heat supply network circulating water pipeline.
Detailed Description
The following will further describe in detail a multi-stage flexible heat supply system and a control method for two back presses according to the present invention, taking the multi-stage flexible heat supply system for two back presses shown in the drawings as an example.
As shown in fig. 1, the system and the control method for multi-parameter heat supply of two back-pressing machines provided by the invention comprise a boiler 1, a first back-pressure turbine 2, a generator 3, a clutch 4, a second back-pressure turbine 5, a first pressure reducer 10, a reheater 13, a second pressure reducer 18 and a first heat exchanger 25. The steam exhaust end of the boiler 1 is connected with the steam inlet end of the first back pressure turbine 2 through the main steam joint adjusting valve 7, and the first back pressure turbine 2, the generator 3, the clutch 4 and the second back pressure turbine 5 are sequentially and coaxially connected.
As shown in fig. 1, the exhaust end of the first back pressure turbine 2 passes through the second steam pipeline 8 and then is divided into two pipelines, one pipeline is connected with the steam inlet end of the reheater 13 through the fourth steam pipeline 12, and the other pipeline provides the industrial steam with the first parameter for the hot users through the third steam pipeline 11.
As shown in fig. 1, the third steam line 11 in this example is provided with a first valve group 9 and a first pressure reducer 10 in this order.
As shown in fig. 1, the exhaust end of the reheater 13 passes through the fifth steam pipe 14 and then is divided into two pipes, one of which is connected to the seventh steam pipe 19, and the other of which is connected to the steam inlet end of the second back pressure turbine 5.
As shown in fig. 1, the seventh steam pipe 19 in this example is provided with a second valve group 17 and a second pressure reducer 18 in this order.
As shown in fig. 1, a third valve group 19 is installed on the sixth steam pipe 15 in this example.
As shown in fig. 1, the exhaust end of the second back pressure turbine 5 is connected to the first heat exchanger 25 through a tenth steam pipe 24, and the exhaust steam is used for heating the heat supply network circulating water in the first heat exchanger 25.
As shown in fig. 1, one path of the seventh steam pipeline 19 is connected to the eighth steam pipeline 21 to provide the industrial steam with the second parameter for the heat consumer, and the other path is connected to the tenth steam pipeline 24 through the ninth steam pipeline 23.
As shown in fig. 1, a fourth valve group 20 is installed on the eighth steam pipe 21 in this example.
As shown in fig. 1, a fifth valve set 22 and a third pressure reducer 27 are installed on the ninth steam pipe 23 in this example.
As shown in fig. 1, in this example, a first heat exchanger 25 is installed on the heat supply network circulating water pipe 26, and circulating water cold water is input into the heat supply network circulating water pipe 26 and circulating water hot water is output from the heat supply network circulating water pipe for domestic heat supply.
As shown in fig. 1, the industrial steam of the first parameter in the present example is exhausted from the first back pressure turbine 2 after decompression, and the temperature is usually 180-320 ℃; the second parameter is the actual reheated steam after decompression, the temperature is usually 490-530 ℃, and the specific temperature of the two industrial steams mainly depends on the unit model and the actual operation condition.
As shown in fig. 1, this example provides a control method for a multi-stage flexible heating system with two back presses, where the control method specifically includes:
referring to fig. 1, in non-heating seasons, the unit simultaneously provides industrial steam with a first parameter and industrial steam with a second parameter and domestic heat supply, the clutch 4 is kept in a connection state, the fifth valve set 22 is closed, the first valve set 9, the second valve set 17, the third valve set 16 and the fourth valve set 20 are opened, and the opening of the valve is adjusted according to heat demand; after the hot steam at the steam exhaust end of the boiler 1 works in the first back pressure turbine 2, a part of steam is decompressed by the first decompressor 10 to provide industrial steam with a first parameter for a heat user, and the rest of steam enters the steam inlet end of the reheater 13 to be secondarily heated; one part of the heated reheated steam is reduced in pressure through the second pressure reducer 18, and the other part of the reheated steam enters the first heat exchanger 25 to heat the circulating water of the heat supply network after acting through the second back pressure turbine 5; the reheated steam depressurized by the second decompressor 18 passes through a fourth valve group 20 to provide industrial steam with a parameter two for a heat user; the hot net circulating water cold water is heated to 80-130 ℃ through a first heat exchanger 25 and then is used as a heat source to provide domestic hot water;
referring to fig. 1, in non-heating seasons, when the industrial steam supply demand of the first parameter changes, the clutch 4 should be kept in the engaged state, the first valve group 9, the second valve group 17, the third valve group 16 and the fourth valve group 20 are opened, the fifth valve group 22 is closed, and the opening degree of the first valve group 9 is adjusted to be larger or smaller according to the change situation of the demand, so that the industrial steam supply of the first parameter is adjusted, and the purposes of flexible heat supply and quick response are achieved;
referring to fig. 1, in the non-heating season, when the industrial steam supply demand of the second parameter changes, the clutch 4 is kept in the engaged state, the first valve group 9, the second valve group 17, the third valve group 16 and the fourth valve group 20 are opened, the fifth valve group 22 is closed, and the opening degrees of the second valve group 17 and the fourth valve group 20 are adjusted to be larger or smaller according to the change situation of the demand, so that the industrial steam supply of the second parameter is adjusted, and the purposes of flexible heat supply and quick response are achieved;
referring to fig. 1, in non-heating seasons, when the demand of the heat consumer for domestic heat supply changes, the clutch 4 should be kept in the engaged state, the first valve group 9, the second valve group 17, the third valve group 16 and the fourth valve group 20 are opened, the fifth valve group 22 is closed, and the opening degree of the third valve group 16 is adjusted to be larger or smaller according to the change situation of the demand, so that the domestic heat supply is adjusted, and the purposes of flexible heat supply and quick response are achieved;
referring to fig. 1, during the heating season, when the demand for domestic heating and heating increases by the hot user, the first, second, third, fourth and fifth valve sets 9, 17, 16, 20 and 22 should be kept engaged by the clutch 4. The opening degree of the fifth valve group 22 is adjusted according to the change condition of the demand, a part of reheated steam depressurized by the second pressure reducer 18 is mixed with the exhaust steam of the second back pressure turbine 5, the temperature of the hot end of the first heat exchanger 25 is raised, and the heat exchange effect is enhanced, so that the domestic heat supply load is improved, and the purposes of flexible heat supply and quick response are achieved;
referring to fig. 1, in the heating season, when the demand of the heat consumer for domestic heat supply and heating reaches the peak value, the clutch 4 is kept in the separation state, the third valve group 16 is closed, and cylinder switching of the second back pressure turbine 5 is carried out; the second valve group 17 and the fifth valve group 22 are kept fully opened, meanwhile, the opening degrees of the first valve group 9 and the fourth valve group 20 are reduced, at the moment, all hot end fluid of the first heat exchanger is reheated steam after pressure reduction, the heat exchange quantity reaches the peak value, and the life heat supply with the maximum load is preferentially provided.

Claims (1)

1. A control method of a multistage flexible heat supply system of two back presses is based on the multistage flexible heat supply system of the two back presses and is characterized in that the system comprises: the system comprises a boiler (1), a first back pressure turbine (2), a generator (3), a clutch (4) and a second back pressure turbine (5);
the first back pressure turbine (2), the generator (3), the clutch (4) and the second back pressure turbine (5) are sequentially and coaxially connected;
the multistage flexible heat supply system of two backpressure machines still include:
the steam inlet end of the first steam pipeline (6) is connected with the steam outlet end of the boiler (1), and the steam outlet end of the first steam pipeline is connected with the steam inlet end of the first back pressure turbine (2);
the steam inlet end of the second steam pipeline (8) is connected with the steam exhaust end of the first back pressure turbine (2), and the steam outlet end of the second steam pipeline is respectively connected with a third steam pipeline (11) and a fourth steam pipeline (12);
the steam inlet end of the third steam pipeline (11) is connected with the steam outlet end of the second steam pipeline (8), and the steam outlet end provides industrial steam with a first parameter for a heat user;
a fourth steam pipeline (12), wherein the steam inlet end of the fourth steam pipeline is connected with the steam outlet end of the second steam pipeline (8), and the steam outlet end of the fourth steam pipeline is connected with the steam inlet end of a reheater (13) of the boiler (1);
a fifth steam pipeline (14), the steam inlet end of which is connected with the steam outlet end of the reheater (13) of the boiler (1), and the steam outlet end of which is respectively connected with a sixth steam pipeline (15) and a seventh steam pipeline (19);
a sixth steam pipeline (15), wherein the steam inlet end of the sixth steam pipeline is connected with the steam outlet end of the fifth steam pipeline (14), and the steam outlet end of the sixth steam pipeline is connected with the steam inlet end of the second back pressure steam turbine (5);
a seventh steam pipeline (19), wherein a steam inlet end of the seventh steam pipeline is connected with a steam outlet end of the fifth steam pipeline (14), and the steam outlet ends of the seventh steam pipeline are respectively connected with an eighth steam pipeline (21) and a ninth steam pipeline (23);
an eighth steam pipeline (21), wherein the steam inlet end of the eighth steam pipeline is connected with the steam outlet end of the seventh steam pipeline (19), and the steam outlet end of the eighth steam pipeline provides industrial steam with a parameter II for a heat user;
a ninth steam pipeline (23), the steam inlet end of which is connected with the steam outlet end of the seventh steam pipeline (19), and the steam outlet end of which is connected with a tenth steam pipeline (24);
a tenth steam pipeline (24), wherein the steam inlet end of the tenth steam pipeline is connected with the steam outlet end of the second back pressure turbine (5), and the steam outlet end of the tenth steam pipeline is connected with the first heat exchanger (25);
a first heat exchanger (25) is arranged on the heat supply network circulating water pipeline (26);
-said reheater (13) being arranged between said fourth steam pipe (12) and a fifth steam pipe (14), and said reheater (13) being arranged in a boiler (1);
the two back press multi-parameter heating systems further comprise: the main steam combined steam valve (7) is arranged on the first steam pipeline (6) and is close to one side of the steam inlet end of the first back pressure steam turbine (2);
the two back press multi-parameter heating systems further comprise: the first valve group (9) is arranged on the third steam pipeline (11) and is positioned in front of the first pressure reducer (10), and the first pressure reducer (10) is arranged on the third steam pipeline (11) and is positioned behind the first valve group (9);
the two back press multi-parameter heating systems further comprise: a second valve group (17) and a second pressure reducer (18), the second valve group (17) being arranged in the seventh steam pipe (19) and in front of the second pressure reducer (18); a second pressure reducer (18) is arranged in said seventh steam conduit (19) and behind said second set of valves (17);
the two back press multi-parameter heating systems further comprise: the third valve group (16) is arranged on the sixth steam pipeline (15) and is positioned in front of the steam inlet end of the second back pressure turbine (5);
the two back press multi-parameter heating systems further comprise: a fourth valve group (20) arranged in the eighth steam pipe (21);
the two back press multi-parameter heating systems further comprise: a fifth valve group (22) arranged in the ninth steam pipeline (23);
the two back press multi-parameter heating systems further comprise: a third pressure reducer (27) arranged in the ninth steam duct (23) and behind the fifth valve group (22);
the method comprises the following steps:
in non-heating seasons, the unit provides industrial steam with a first parameter and industrial steam with a second parameter and domestic heat supply at the same time, the clutch (4) is kept in a joint state, the fifth valve group (22) is closed, the first valve group (9), the second valve group (17), the third valve group (16) and the fourth valve group (20) are opened, and the opening degree of the valves is adjusted according to heat demands; after the hot steam at the steam exhaust end of the boiler (1) works in a first back pressure turbine (2), a part of steam is subjected to pressure reduction through a first pressure reducer (10) to provide industrial steam with a first parameter for a heat user, and the rest of steam enters a reheater (13) and the steam inlet end is heated for the second time; one part of the heated reheat steam is subjected to pressure reduction through a second pressure reducer (18), and the other part of the reheated steam enters a first heat exchanger (25) to heat circulating water of a heat supply network after being worked through a second back pressure turbine (5); the reheated steam depressurized by the second decompressor (18) passes through a fourth valve group (20) and then provides industrial steam with a parameter two for a heat user; the hot net circulating water cold water is heated to 80-130 ℃ through a first heat exchanger (25) and then is used as a heat source to provide domestic hot water;
in a non-heating season, when a hot user changes the industrial steam supply demand of a parameter I, the clutch (4) is kept in a joint state, the first valve group (9), the second valve group (17), the third valve group (16) and the fourth valve group (20) are opened, the fifth valve group (22) is closed, and the opening degree of the first valve group (9) is adjusted to be larger or smaller according to the change condition of the demand, so that the industrial steam supply of the parameter I is adjusted, and the purposes of flexible heat supply and quick response are achieved;
in non-heating seasons, when the demand of a hot user for industrial steam supply with the parameter II changes, the clutch (4) is kept in a joint state, the first valve group (9), the second valve group (17), the third valve group (16) and the fourth valve group (20) are opened, the fifth valve group (22) is closed, and the opening degrees of the second valve group (17) and the fourth valve group (20) are adjusted to be larger or smaller according to the change situation of the demand, so that the industrial steam supply with the parameter II is adjusted, and the purposes of flexible heat supply and quick response are achieved;
in non-heating seasons, when the demand of a heat user for domestic heat supply changes, the clutch (4) is kept in a joint state, the first valve group (9), the second valve group (17), the third valve group (16) and the fourth valve group (20) are opened, the fifth valve group (22) is closed, and the opening degree of the third valve group (16) is adjusted to be larger or smaller according to the change situation of the demand, so that the domestic heat supply is adjusted, and the purposes of flexible heat supply and quick response are achieved;
in the heating season, when the demand of the hot user for domestic heating and heating is increased, the clutch (4) is kept in an engaged state, and the first valve set (9), the second valve set (17), the third valve set (16), the fourth valve set (20) and the fifth valve set (22) are opened; the opening of the fifth valve set (22) is adjusted according to the change condition of the demand, a part of reheated steam which is depressurized by the second pressure reducer (18) is mixed with the exhaust steam of the second back pressure turbine (5), the temperature of the hot end of the first heat exchanger (25) is increased, and the heat exchange effect is enhanced, so that the domestic heat supply load is improved, and the purposes of flexible heat supply and quick response are achieved;
in a heating season, when the requirements of a heat user on life heating and heating reach peak values, the clutch (4) is kept in a separated state, the third valve group (16) is closed, and cylinder cutting of the second back pressure steam turbine (5) is carried out; and (3) keeping the second valve group (17) and the fifth valve group (22) fully opened, and simultaneously reducing the opening degrees of the first valve group (9) and the fourth valve group (20), wherein all the hot-end fluid of the first heat exchanger is reheated steam after pressure reduction, the heat exchange quantity reaches a peak value, and the domestic heat supply with the maximum load is preferentially provided.
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