CN113357690A - Interconnected mutual-backup heat supply system and method without shutdown - Google Patents
Interconnected mutual-backup heat supply system and method without shutdown Download PDFInfo
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- CN113357690A CN113357690A CN202110685111.0A CN202110685111A CN113357690A CN 113357690 A CN113357690 A CN 113357690A CN 202110685111 A CN202110685111 A CN 202110685111A CN 113357690 A CN113357690 A CN 113357690A
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- 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
- F24D1/00—Steam central heating systems
- F24D1/08—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks
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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
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
- F01K7/02—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steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of multiple-expansion type
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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
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- 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
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- 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
- F24D19/1003—Arrangement or mounting of control or safety devices for steam heating systems
Abstract
The application discloses a heating system and a method for mutual backup by interconnection without shutdown, wherein the heating system comprises a first unit and a second unit which are mutually communicated through a valve, and the first unit and the second unit respectively comprise a boiler, a steam turbine high-pressure cylinder, a steam turbine medium-pressure cylinder, a heating network heater, a heating network drainage pump and a pipeline valve system; under the condition of single unit turbine failure, a high side valve and a low side valve are adopted for pressure reduction and temperature reduction, so that the heat supply requirement is met, and 100% of heat load can be met; when a single unit is overhauled and shut down, if the steam turbine and the heat supply network heater of the other unit are in failure, the valves for communicating the first unit and the second unit can be opened, the heat supply network heater of the shut-down unit is used for supplying heat, and 60% of heat load can be met. This application constitutes the interconnected heating system who is equipped with each other with two units UNICOM each other, has improved heating system's whole heat supply reliability.
Description
Technical Field
The application relates to the technical field of heating systems and methods, in particular to a shutdown and non-shutdown interconnected mutual-backup heating system and method.
Background
With the rapid development of the industry, a large-capacity and high-parameter 330MW unit and a 2X330MW unit become a main machine type for supplying heat gradually. The 2X330MW heat supply unit mainly comprises boiler equipment, steam turbine equipment, a water supply pump, a steam pipeline, a condensed water pipeline and the like. However, for the existing 2X330MW heat supply unit, when the head station of the heat supply network is also a unit system, because the units are connected in series and are independent from each other, when any one of the steam turbines or the heat supply network heaters fails and stops operating, the whole 330MW unit in which the fault is located will stop operating, and the rest of the units will be difficult to ensure the heat supply reliability, so the existing heat supply system needs to be modified to improve the whole heat supply reliability.
Disclosure of Invention
The application provides a shutdown and non-shutdown interconnected mutual-backup heat supply system and method, which aim to solve the problem that the heat supply system in the prior art is difficult to guarantee the heat supply amount due to faults.
The technical scheme adopted by the application is as follows:
a shutdown and non-shutdown interconnected mutual-backup heat supply system comprises a first unit 1 and a second unit 2 which are communicated with each other, wherein the first unit 1 comprises a first boiler 101, a first turbine high-pressure cylinder 102, a first turbine intermediate-pressure cylinder 103, a first heat supply network heater 104 and a first steam exhaust device 111;
the output end of the first boiler 101 is connected with the input end of the first turbine high-pressure cylinder 102 through a main steam pipeline, a valve 11 is arranged on the main steam pipeline, and the output end of the first turbine high-pressure cylinder 102 is connected with the input end of the first boiler 101 through a reheat cold section pipeline;
the other output end of the first boiler 101 is connected with the first turbine intermediate pressure cylinder 103 through a reheating section pipeline, a valve 12 is arranged on the reheating section pipeline, the output end of the first turbine intermediate pressure cylinder 103 is connected with the input end of the first heat supply network heater 104 through a heating steam pipeline, a valve 16 is arranged on the heating steam pipeline, and the output end of the first heat supply network heater 104 is connected with a condensed water pipeline;
the other output end of the first boiler 101 is sequentially connected with a first low-pressure bypass valve 110 and the first steam exhaust device 111 through a low-pressure bypass pipeline, and a valve 13 is arranged between the first low-pressure bypass valve 110 and the first steam exhaust device 111;
a secondary steam pipeline is connected between the low-pressure bypass pipeline and the heating steam pipeline of the first unit 1, and a valve 14 and a valve 15 are sequentially arranged on the secondary steam pipeline;
the second unit 2 comprises a second boiler 201, a second high-pressure turbine cylinder 202, a second medium-pressure turbine cylinder 203, a second heat net heater 204 and a second steam exhaust device 211;
the output end of the second boiler 201 is connected with the input end of the second turbine high-pressure cylinder 202 through a main steam pipeline, a valve 21 is arranged on the main steam pipeline, and the output end of the second turbine high-pressure cylinder 202 is connected with the input end of the second boiler 201 through a reheat cold section pipeline;
the other output end of the second boiler 201 is connected with the second steam turbine intermediate pressure cylinder 203 through a reheating hot section pipeline, a valve 22 is arranged on the reheating hot section pipeline, the output end of the second steam turbine intermediate pressure cylinder 203 is connected with the input end of the second heat supply network heater 204 through a heating steam pipeline, a valve 26 is arranged on the heating steam pipeline, and the output end of the second heat supply network heater 204 is connected with a condensed water pipeline;
the other output end of the second boiler 201 is sequentially connected with a second low-pressure bypass valve 210 and the second steam exhaust device 211 through a low-pressure bypass pipeline, and a valve 23 is arranged between the second low-pressure bypass valve 210 and the second steam exhaust device 211;
a secondary steam pipeline is connected between the low-pressure bypass pipeline of the second unit 2 and the heating steam pipeline, and a valve 24 and a valve 25 are sequentially arranged on the secondary steam pipeline.
Preferably, the secondary steam pipeline of the first unit 1 and the secondary steam pipeline of the second unit 2 are communicated with each other through a valve 7;
the condensed water pipeline of the first unit 1 and the condensed water pipeline of the second unit 2 are communicated with each other through a valve 8.
Preferably, a first high-pressure main throttle valve 106 is further disposed on a main steam pipeline of the first unit 1, and the first high-pressure main throttle valve 106 is located between the valve 11 and the first turbine high-pressure cylinder 102;
a first intermediate-pressure main valve 105 is further arranged on a reheating section pipeline of the first unit 1, and the first intermediate-pressure main valve 105 is located between the valve 12 and the first turbine intermediate pressure cylinder 103;
a second high-pressure main valve 206 is further arranged on the main steam pipeline of the second unit 2, and the second high-pressure main valve 206 is located between the valve 21 and the second turbine high-pressure cylinder 202;
a second intermediate-pressure main valve 205 is further disposed on a reheat hot section pipeline of the second unit 2, and the second intermediate-pressure main valve 205 is located between the valve 22 and the second turbine intermediate-pressure cylinder 203.
Preferably, a high-pressure bypass pipeline is connected between the output end of the first boiler 101 and the reheat cold section pipeline, and a first high-pressure bypass valve 108 is installed on the high-pressure bypass pipeline;
a high-pressure bypass pipeline is connected between the output end of the second boiler 201 and the reheat cooling section pipeline, and a second high-pressure bypass valve 208 is installed on the high-pressure bypass pipeline.
Preferably, one end of the secondary steam pipe of the first unit 1 is arranged between the first low pressure bypass valve 110 and the valve 13, and the other end is arranged between the valve 16 and the first heat net heater 104;
one end of the secondary steam pipe of the second unit 2 is disposed between the second low pressure bypass valve 210 and the valve 23, and the other end is disposed between the valve 26 and the second heat net heater 204.
Preferably, a plurality of heating steam branch pipes connected with the first heat supply network heater 104 are arranged in parallel on the heating steam pipeline of the first unit 1, one valve 16 is installed on each heating steam branch pipe, and the valves 15 are arranged on the secondary steam pipelines in parallel behind the valve 14 and in one-to-one correspondence with the valves 16;
a plurality of heating steam branch pipes connected with the second heat supply network heater 204 are arranged in parallel on the heating steam pipeline of the second unit 2, one valve 26 is arranged on each heating steam branch pipe, and the valves 25 are arranged on the secondary steam pipeline behind the valve 24 in parallel and in one-to-one correspondence with the valves 26.
Preferably, the output end of the first heat supply network heater 104 is connected with a first heat supply network drain pump 109, and is used for pressurizing the heat supply network drain and sending the pressurized heat supply network drain to a condensed water pipeline of the first unit 1;
the output end of the second heat supply network heater 204 is connected with a second heat supply network drain pump 209, and the second heat supply network drain pump is used for pressurizing the drain water of the heat supply network and then sending the drain water to the condensed water pipeline of the second unit 2.
Preferably, one end of the valve 7 is connected between the valve 14 and the valve 15 through a pipeline, and the other end is connected between the valve 24 and the valve 25 through a pipeline.
Preferably, a first exhaust check valve 107 is arranged on a reheat cold section pipeline of the first unit 1 and positioned behind the first turbine high-pressure cylinder 102;
and a second steam exhaust check valve 207 is arranged on the reheating cold section pipeline of the second unit 2 and positioned behind the second turbine high-pressure cylinder 202.
A shutdown non-stop furnace interconnection mutual-backup heat supply method is applied to the shutdown non-stop furnace interconnection mutual-backup heat supply system, and comprises the following steps:
when the first unit 1 operates independently, the valve 7 and the valve 8 are closed;
when the first unit 1 operates alone and a steam turbine of the first unit 1 fails, closing a valve 11, a valve 12, a valve 13 and a valve 16, opening a first high-pressure bypass valve 108, a first low-pressure bypass valve 110, a valve 14 and a valve 15, allowing main steam to enter a first heat supply network heater 104 after sequentially passing through a high-pressure bypass pipeline, the first high-pressure bypass valve 108, a reheat cooling section pipeline, a first boiler 101, a low-pressure bypass pipeline, the first low-pressure bypass valve 110, a secondary steam pipeline, the valve 14 and the valve 15, and allowing heat supply network drainage water to enter a condensed water pipeline after being pressurized by a first heat supply network drainage pump 109;
when the steam turbine of the second unit 2 is in failure, the first unit 1 is operated independently in the same way;
when the first unit 1 is stopped for maintenance and the second unit 2 is running, if the turbine of the second unit 2 and the second heat supply network heater 204 are in failure, the valve 21, the valve 22, the valve 23, the valve 25 and the valve 26 are closed, the second high-pressure bypass valve 208, the second low-pressure bypass valve 210, the valve 24, the valve 7 and the valve 8 of the second unit 2 are opened, the valve 15 of the first unit 1 is opened, the main steam of the second boiler 201 enters the first heat supply network heater 104 through the high-pressure bypass pipeline, the second high-pressure bypass valve 208, the reheat cooling section pipeline, the second boiler 201, the low-pressure bypass pipeline, the second low-pressure bypass valve 210, the secondary steam pipeline, the valve 24, the valve 7 and the valve 15 of the second unit 2, and the heat supply network drainage water enters the condensed water pipeline of the second unit 2 through the pipeline where the valve 8 is located after being pressurized by the first heat supply network drainage pump 109;
when the second unit 2 is shut down for maintenance, the steam turbine of the first unit 1 and the second grid heater 104 are in failure and operate in the same manner.
The technical scheme of the application has the following beneficial effects:
according to the method, the heat supply systems of the two units are communicated, and the high side valve and the low side valve are adopted for pressure reduction and temperature reduction under the condition of the fault of a steam turbine of a single unit, so that the heat supply requirement is met, and the heat load of 100% can be met; when a single unit is shut down, if the steam turbine and the heat supply network heater of the other unit are in failure, the heat supply network heater of the shut-down unit can be used for supplying heat by opening the valve 7 and the valve 8 which are communicated between the two units, so that 60% of heat load can be met, and the heat supply reliability is improved. This application improves whole heating system's heat supply reliability through improving two heating system's that the unit is constituteed pipeline and valve system, solves heating system among the prior art and meets the problem that the trouble is difficult to guarantee the heat supply volume.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a shutdown and non-shutdown interconnected mutual backup heating system according to the present application;
illustration of the drawings:
wherein 1-the first unit, 101-the first boiler, 102-the first turbine high-pressure cylinder, 103-the first turbine intermediate-pressure cylinder, 104-the first heat network heater, 105-the first intermediate-pressure main throttle, 106-the first high-pressure main throttle, 107-the first steam-exhaust check valve, 108-the first high-pressure bypass valve, 109-the first heat network steam-exhaust pump, 110-the first low-pressure bypass valve, 111-the first steam-exhaust device, 7, 8, 11, 12, 13, 14, 15, 16-the valve, 2-the second unit, 201-the second boiler, 202-the second turbine high-pressure cylinder, 203-the second turbine intermediate-pressure cylinder, 204-the second heat network heater, 205-the second intermediate-pressure main throttle, 206-the second high-pressure main throttle, 207-the second steam-exhaust check valve, 208-the second high-pressure bypass valve, 209-second heat net drain pump, 210-second low pressure bypass valve, 211-second steam exhaust, 21, 22, 23, 24, 25, 26-valve.
Detailed Description
Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following examples do not represent all embodiments consistent with the present application. But merely as exemplifications of systems and methods consistent with certain aspects of the application, as recited in the claims.
Referring to fig. 1, a schematic structural diagram of a shutdown interconnected mutual-backup heating system without shutdown is shown.
The interconnected mutual-backup heat supply system without shutdown comprises a first unit 1 and a second unit 2 which are communicated with each other, wherein the first unit 1 comprises a first boiler 101, a first turbine high-pressure cylinder 102, a first turbine intermediate-pressure cylinder 103, a first heat supply network heater 104 and a first steam exhaust device 111;
the output end of the first boiler 101 is connected with the input end of the first turbine high-pressure cylinder 102 through a main steam pipeline, a valve 11 is arranged on the main steam pipeline, and the output end of the first turbine high-pressure cylinder 102 is connected with the input end of the first boiler 101 through a reheat cold section pipeline;
the other output end of the first boiler 101 is connected with the first turbine intermediate pressure cylinder 103 through a reheating section pipeline, a valve 12 is arranged on the reheating section pipeline, the output end of the first turbine intermediate pressure cylinder 103 is connected with the input end of the first heat supply network heater 104 through a heating steam pipeline, a valve 16 is arranged on the heating steam pipeline, and the output end of the first heat supply network heater 104 is connected with a condensed water pipeline;
the reheating section pipeline is sequentially connected with a first low-pressure bypass valve 110 and the first exhaust device 111 through a low-pressure bypass pipeline arranged in front of the valve 12, and a valve 13 is arranged between the first low-pressure bypass valve 110 and the first exhaust device 111;
a secondary steam pipeline is connected between the low-pressure bypass pipeline and the heating steam pipeline of the first unit 1, and a valve 14 and a valve 15 are sequentially arranged on the secondary steam pipeline;
the second unit 2 comprises a second boiler 201, a second high-pressure turbine cylinder 202, a second medium-pressure turbine cylinder 203, a second heat net heater 204 and a second steam exhaust device 211;
the output end of the second boiler 201 is connected with the input end of the second turbine high-pressure cylinder 202 through a main steam pipeline, a valve 21 is arranged on the main steam pipeline, and the output end of the second turbine high-pressure cylinder 202 is connected with the input end of the second boiler 201 through a reheat cold section pipeline;
the other output end of the second boiler 201 is connected with the second steam turbine intermediate pressure cylinder 203 through a reheating hot section pipeline, a valve 22 is arranged on the reheating hot section pipeline, the output end of the second steam turbine intermediate pressure cylinder 203 is connected with the input end of the second heat supply network heater 204 through a heating steam pipeline, a valve 26 is arranged on the heating steam pipeline, and the output end of the second heat supply network heater 204 is connected with a condensed water pipeline;
the reheating section pipeline is sequentially connected with a second low-pressure bypass valve 210 and a second steam exhaust device 211 through a low-pressure bypass pipeline arranged in front of the valve 22, and a valve 23 is arranged between the second low-pressure bypass valve 210 and the second steam exhaust device 211;
a secondary steam pipeline is connected between the low-pressure bypass pipeline of the second unit 2 and the heating steam pipeline, and a valve 24 and a valve 25 are sequentially arranged on the secondary steam pipeline.
Preferably, the secondary steam pipeline of the first unit 1 and the secondary steam pipeline of the second unit 2 are communicated with each other through a valve 7;
the condensed water pipeline of the first unit 1 and the condensed water pipeline of the second unit 2 are communicated with each other through a valve 8.
When the two units respectively and independently operate, the valve 7 and the valve 8 which are communicated with the two units are in a closed state. When one unit is stopped, if the steam turbine and the heat supply network heater of the other unit are in failure, the heat supply network heater of the stopped unit can be used for supplying heat by opening the valve 7 and the valve 8.
Preferably, a first high-pressure main throttle valve 106 is further disposed on a main steam pipeline of the first unit 1, and the first high-pressure main throttle valve 106 is located between the valve 11 and the first turbine high-pressure cylinder 102;
a first intermediate-pressure main valve 105 is further arranged on a reheating section pipeline of the first unit 1, and the first intermediate-pressure main valve 105 is located between the valve 12 and the first turbine intermediate pressure cylinder 103;
a second high-pressure main valve 206 is further arranged on the main steam pipeline of the second unit 2, and the second high-pressure main valve 206 is located between the valve 21 and the second turbine high-pressure cylinder 202;
a second intermediate-pressure main valve 205 is further disposed on a reheat hot section pipeline of the second unit 2, and the second intermediate-pressure main valve 205 is located between the valve 22 and the second turbine intermediate-pressure cylinder 203.
Preferably, a high-pressure bypass pipeline is connected between the main steam pipeline of the first unit 1 and the reheat cooling section pipeline before the valve 11, and a first high-pressure bypass valve 108 is mounted on the high-pressure bypass pipeline;
a high-pressure bypass pipeline is connected between the main steam pipeline of the second unit 2 before the valve 21 and the reheating cold section pipeline, and a second high-pressure bypass valve 208 is mounted on the high-pressure bypass pipeline.
When the steam turbine of the first unit 1 is in a fault shutdown state, the first boiler 101 is in load reduction operation, the first high-pressure main throttle 106, the first medium-pressure main throttle 105, the valve 16, the valve 11, the valve 12 and the valve 13 are closed, the valve 14 and the valve 15 are opened, main steam enters the boiler through a reheating cooling section pipeline after being subjected to temperature and pressure reduction through the first high-pressure bypass valve 108, is heated, is subjected to temperature and pressure reduction through the low-pressure bypass pipeline and the first low-pressure bypass valve 110, and enters the first heat supply network heater 104 through a secondary steam pipeline where the valves 14 and 15 are located. The same applies to the case of a turbine of the second power plant 2 failing to operate.
Preferably, one end of the secondary steam pipe of the first unit 1 is arranged between the first low pressure bypass valve 110 and the valve 13, and the other end is arranged between the valve 16 and the first heat net heater 104;
one end of the secondary steam pipe of the second unit 2 is disposed between the second low pressure bypass valve 210 and the valve 23, and the other end is disposed between the valve 26 and the second heat net heater 204.
Preferably, a plurality of heating steam branch pipes connected with the first heat supply network heater 104 are arranged in parallel on the heating steam pipeline of the first unit 1, one valve 16 is installed on each heating steam branch pipe, and the valves 15 are arranged on the secondary steam pipelines in parallel behind the valve 14 and in one-to-one correspondence with the valves 16;
a plurality of heating steam branch pipes connected with the second heat supply network heater 204 are arranged in parallel on the heating steam pipeline of the second unit 2, one valve 26 is arranged on each heating steam branch pipe, and the valves 25 are arranged on the secondary steam pipeline behind the valve 24 in parallel and in one-to-one correspondence with the valves 26.
Preferably, the output end of the first heat supply network heater 104 is connected with a first heat supply network drain pump 109, and is used for pressurizing the heat supply network drain and sending the pressurized heat supply network drain to a condensed water pipeline of the first unit 1;
the output end of the second heat supply network heater 204 is connected with a second heat supply network drain pump 209, and the second heat supply network drain pump is used for pressurizing the drain water of the heat supply network and then sending the drain water to the condensed water pipeline of the second unit 2.
Preferably, one end of the valve 7 is connected between the valve 14 and the valve 15 through a pipeline, and the other end is connected between the valve 24 and the valve 25 through a pipeline.
Preferably, a first exhaust check valve 107 is arranged on a reheat cold section pipeline of the first unit 1 and positioned behind the first turbine high-pressure cylinder 102;
and a second steam exhaust check valve 207 is arranged on the reheating cold section pipeline of the second unit 2 and positioned behind the second turbine high-pressure cylinder 202.
A shutdown non-stop furnace interconnection mutual-backup heat supply method is applied to the shutdown non-stop furnace interconnection mutual-backup heat supply system, and comprises the following steps:
when the first unit 1 operates independently, the valve 7 and the valve 8 are closed;
when the first unit 1 operates alone and a steam turbine of the first unit 1 fails, closing a valve 11, a valve 12, a valve 13 and a valve 16, opening a first high-pressure bypass valve 108, a first low-pressure bypass valve 110, a valve 14 and a valve 15, allowing main steam to enter a first heat supply network heater 104 after sequentially passing through a high-pressure bypass pipeline, the first high-pressure bypass valve 108, a reheat cooling section pipeline, a first boiler 101, a reheat heating section pipeline, a low-pressure bypass pipeline, the first low-pressure bypass valve 110, a secondary steam pipeline, the valve 14 and the valve 15, and allowing heat supply network drainage water to enter a condensed water pipeline after being pressurized by a first heat supply network drainage pump 109;
when the steam turbine of the second unit 2 is in failure, the first unit 1 is operated independently in the same way;
when the first unit 1 is stopped for maintenance and the second unit 2 is running, if the turbine of the second unit 2 and the second heat supply network heater 204 are in failure, the valve 21, the valve 22, the valve 23, the valve 25 and the valve 26 are closed, the second high-pressure bypass valve 208, the second low-pressure bypass valve 210, the valve 24, the valve 7 and the valve 8 of the second unit 2 are opened, the valve 15 of the first unit 1 is opened, the main steam of the second boiler 201 enters the first heat supply network heater 104 through the high-pressure bypass pipeline, the second high-pressure bypass valve 208, the reheat cooling section pipeline, the second boiler 201, the reheat heating section pipeline, the low-pressure bypass pipeline, the second low-pressure bypass valve 210, the secondary steam pipeline, the valve 24, the valve 7 and the valve 15 of the second unit 2, and the heat supply network drain water enters the condensed water pipeline of the second unit 2 through the pipeline where the valve 8 is located after being pressurized by the first heat supply network drain pump 109;
when the second unit 2 is shut down for maintenance, the steam turbine of the first unit 1 and the second grid heater 104 are in failure and operate in the same manner.
According to the method, two units are mutually communicated to form a mutually-interconnected and mutually-backup heat supply system, and under the condition that a single unit turbine fails, a high side valve and a low side valve are adopted to reduce pressure and temperature to meet the heat supply requirement, so that 100% of heat load can be met; when a single unit is shut down, if another unit turbine and a heat supply network heater break down, the mode of opening and communicating a valve 7 and a valve 8 between the two units can be utilized, the heat supply network heater of the shut-down unit is utilized for supplying heat, 60% of heat load can be met, the reliability of the whole heat supply of a heat supply system is improved, the heat supply system in the application can flexibly adjust the operation condition of each unit according to the actual heat supply requirement, and various sudden conditions can be adapted. Other interconnected and mutually-backup heating systems with multiple units, which have the same principle as the technical scheme in the application, also belong to the protection scope of the application.
The embodiments provided in the present application are only a few examples of the general concept of the present application, and do not limit the scope of the present application. Any other embodiments extended according to the scheme of the present application without inventive efforts will be within the scope of protection of the present application for a person skilled in the art.
Claims (10)
1. A shutdown and non-shutdown interconnected mutual-backup heat supply system comprises a first unit (1) and a second unit (2) which are communicated with each other, and is characterized in that the first unit (1) comprises a first boiler (101), a first turbine high-pressure cylinder (102), a first turbine intermediate-pressure cylinder (103), a first heat supply network heater (104) and a first steam exhaust device (111);
the output end of the first boiler (101) is connected with the input end of the first turbine high-pressure cylinder (102) through a main steam pipeline, a valve (11) is arranged on the main steam pipeline, and the output end of the first turbine high-pressure cylinder (102) is connected with the input end of the first boiler (101) through a reheat cooling section pipeline;
the other output end of the first boiler (101) is connected with the first steam turbine intermediate pressure cylinder (103) through a reheating hot section pipeline, a valve (12) is arranged on the reheating hot section pipeline, the output end of the first steam turbine intermediate pressure cylinder (103) is connected with the input end of the first heat supply network heater (104) through a heating steam pipeline, a valve (16) is arranged on the heating steam pipeline, and the output end of the first heat supply network heater (104) is connected with a condensed water pipeline;
the other output end of the first boiler (101) is sequentially connected with a first low-pressure bypass valve (110) and the first steam exhaust device (111) through a low-pressure bypass pipeline, and a valve (13) is arranged between the first low-pressure bypass valve (110) and the first steam exhaust device (111);
a secondary steam pipeline is connected between the low-pressure bypass pipeline of the first unit (1) and the heating steam pipeline, and a valve (14) and a valve (15) are sequentially arranged on the secondary steam pipeline;
the second unit (2) comprises a second boiler (201), a second turbine high-pressure cylinder (202), a second turbine medium-pressure cylinder (203), a second heat supply network heater (204) and a second steam exhaust device (211);
the output end of the second boiler (201) is connected with the input end of the second turbine high-pressure cylinder (202) through a main steam pipeline, a valve (21) is arranged on the main steam pipeline, and the output end of the second turbine high-pressure cylinder (202) is connected with the input end of the second boiler (201) through a reheat cooling section pipeline;
the other output end of the second boiler (201) is connected with the second steam turbine intermediate pressure cylinder (203) through a reheating hot section pipeline, a valve (22) is arranged on the reheating hot section pipeline, the output end of the second steam turbine intermediate pressure cylinder (203) is connected with the input end of the second heat supply network heater (204) through a heating steam pipeline, a valve (26) is arranged on the heating steam pipeline, and the output end of the second heat supply network heater (204) is connected with a condensed water pipeline;
the other output end of the second boiler (201) is sequentially connected with a second low-pressure bypass valve (210) and the second steam exhaust device (211) through a low-pressure bypass pipeline, and a valve (23) is arranged between the second low-pressure bypass valve (210) and the second steam exhaust device (211);
and a secondary steam pipeline is connected between the low-pressure bypass pipeline of the second unit (2) and the heating steam pipeline, and a valve (24) and a valve (25) are sequentially arranged on the secondary steam pipeline.
2. A shutdown non-stop interconnected mutual backup heating system according to claim 1, characterized in that the secondary steam pipeline of the first unit (1) and the secondary steam pipeline of the second unit (2) are communicated with each other through a valve (7);
the condensed water pipeline of the first unit (1) and the condensed water pipeline of the second unit (2) are communicated with each other through a valve (8).
3. A shutdown non-stop interconnected mutual backup heating system according to claim 2, characterized in that a first high pressure main throttle valve (106) is further arranged on a main steam pipeline of the first unit (1), and the first high pressure main throttle valve (106) is positioned between the valve (11) and the first turbine high pressure cylinder (102);
a reheating thermal section pipeline of the first unit (1) is also provided with a first intermediate-pressure main throttle valve (105), and the first intermediate-pressure main throttle valve (105) is positioned between the valve (12) and the first turbine intermediate pressure cylinder (103);
a second high-pressure main throttle valve (206) is further arranged on a main steam pipeline of the second unit (2), and the second high-pressure main throttle valve (206) is located between the valve (21) and the second turbine high-pressure cylinder (202);
and a second intermediate-pressure main throttle valve (205) is further arranged on a reheating section pipeline of the second unit (2), and the second intermediate-pressure main throttle valve (205) is positioned between the valve (22) and the second turbine intermediate-pressure cylinder (203).
4. A shutdown non-shutdown interconnected mutual backup heating system according to claim 3, characterized in that a high pressure bypass pipeline is connected between the output end of the first boiler (101) and the reheating cold section pipeline, and a first high pressure bypass valve (108) is arranged on the high pressure bypass pipeline;
and a high-pressure bypass pipeline is connected between the output end of the second boiler (201) and the reheating cold section pipeline, and a second high-pressure bypass valve (208) is arranged on the high-pressure bypass pipeline.
5. A shutdown non-stop interconnected mutual backup heating system according to claim 4, characterized in that said secondary steam pipe of said first unit (1) is arranged between said first low pressure by-pass valve (110) and said valve (13) at one end and between said valve (16) and said first heat net heater (104) at the other end;
one end of the secondary steam pipeline of the second unit (2) is arranged between the second low-pressure bypass valve (210) and the valve (23), and the other end of the secondary steam pipeline is arranged between the valve (26) and the second heat supply network heater (204).
6. A non-stop shutdown interconnected mutually-backup heating system according to claim 5, wherein a plurality of heating steam branch pipes connected with the first heat supply network heater (104) are arranged in parallel on a heating steam pipe of the first unit (1), each heating steam branch pipe is provided with one valve (16), and the valves (15) are arranged in parallel on the secondary steam pipe behind the valve (14) and in one-to-one correspondence with the valves (16);
a plurality of heating steam branch pipelines which are connected with the second heat supply network heater (204) are arranged on a heating steam pipeline of the second unit (2) in parallel, each heating steam branch pipeline is provided with one valve (26), and the secondary steam pipeline is positioned behind the valves (24) in parallel and is provided with the valves (25) corresponding to the valves (26) one by one.
7. A shutdown non-stop interconnected mutual backup heating system according to claim 6, characterized in that the output end of the first heat supply network heater (104) is connected with a first heat supply network drain pump (109) for pressurizing the drain of the heat supply network and sending the drain to the condensed water pipeline of the first unit (1);
the output end of the second heat supply network heater (204) is connected with a second heat supply network drainage pump (209) and used for conveying the drainage water of the heat supply network to a condensed water pipeline of the second unit (2) after being pressurized.
8. A shut down and shut down interconnected mutually backup heating system according to claim 7, characterised in that said valve (7) is connected between said valve (14) and said valve (15) by a pipe at one end and between said valve (24) and said valve (25) by a pipe at the other end.
9. A shutdown non-shutdown interconnected mutual backup heating system according to claim 1, characterized in that a first exhaust check valve (107) is arranged on a reheat cold leg pipeline of the first unit (1) behind the first turbine high pressure cylinder (102);
and a second steam exhaust check valve (207) is arranged on a reheating cold section pipeline of the second unit (2) and is positioned behind the second turbine high-pressure cylinder (202).
10. A shutdown non-stop furnace interconnection mutual-backup heat supply method, which is applied to the shutdown non-stop furnace interconnection mutual-backup heat supply system of any one of claims 1 to 9, and comprises the following steps:
when the first unit (1) operates independently, the valve (7) and the valve (8) are closed;
when the first unit (1) operates independently and a steam turbine of the first unit (1) is in fault, closing a valve (11), a valve (12), a valve (13) and a valve (16), opening a first high-pressure bypass valve (108), a first low-pressure bypass valve (110), a valve (14) and a valve (15), enabling main steam to enter a first heat supply network heater (104) after sequentially passing through a high-pressure bypass pipeline, the first high-pressure bypass valve (108), a reheating cooling section pipeline, a first boiler (101), a low-pressure bypass pipeline, the first low-pressure bypass valve (110), a secondary steam pipeline, the valve (14) and the valve (15), and enabling heat supply network drainage to enter a condensed water pipeline after being pressurized by a first heat supply network drainage pump (109);
when a steam turbine of the second unit (2) breaks down, the first unit (1) operates independently in the same way;
when the first unit (1) is shut down and overhauled and the second unit (2) is operated, if a steam turbine and a second heat supply network heater (204) of the second unit (2) have faults, a valve (21), a valve (22), a valve (23), a valve (25) and a valve (26) are closed, a second high-pressure bypass valve (208), a second low-pressure bypass valve (210), a valve (24), a valve (7) and a valve (8) of the second unit (2) are opened, a valve (15) of the first unit (1) is opened, main steam of a second boiler (201) enters the first heat supply network heater (104) through a high-pressure bypass pipeline, a second high-pressure bypass valve (208), a reheat cooling section pipeline, a second boiler (201), a low-pressure bypass pipeline, a second low-pressure bypass valve (210), a secondary steam pipeline, the valve (24), the valve (7) and the valve (15) of the second unit (2), after being pressurized by a first heat supply network drainage pump (109), the heat supply network drainage enters a condensed water pipeline of the second unit (2) through a pipeline where a valve (8) is located;
when the second unit (2) is shut down for maintenance, the steam turbine of the first unit (1) and the first heat supply network heater (104) are operated in the same manner.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110685111.0A CN113357690A (en) | 2021-06-21 | 2021-06-21 | Interconnected mutual-backup heat supply system and method without shutdown |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110685111.0A CN113357690A (en) | 2021-06-21 | 2021-06-21 | Interconnected mutual-backup heat supply system and method without shutdown |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114941552A (en) * | 2022-05-13 | 2022-08-26 | 华电电力科学研究院有限公司 | Shutdown non-shutdown heat supply rapid switching control method based on large supercritical reheating type double-extraction back pressure unit |
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2021
- 2021-06-21 CN CN202110685111.0A patent/CN113357690A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114941552A (en) * | 2022-05-13 | 2022-08-26 | 华电电力科学研究院有限公司 | Shutdown non-shutdown heat supply rapid switching control method based on large supercritical reheating type double-extraction back pressure unit |
| CN114941552B (en) * | 2022-05-13 | 2023-05-23 | 华电电力科学研究院有限公司 | Large supercritical reheating type double-pumping back pressure unit-based rapid switching control method for heat supply without stopping furnace when shutdown |
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