CN108678819B - System for realizing thermal decoupling and rapid peak shaving by utilizing bypass - Google Patents
System for realizing thermal decoupling and rapid peak shaving by utilizing bypass Download PDFInfo
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- CN108678819B CN108678819B CN201810365634.5A CN201810365634A CN108678819B CN 108678819 B CN108678819 B CN 108678819B CN 201810365634 A CN201810365634 A CN 201810365634A CN 108678819 B CN108678819 B CN 108678819B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 54
- 238000005338 heat storage Methods 0.000 claims description 59
- 230000001105 regulatory effect Effects 0.000 claims description 39
- 238000000605 extraction Methods 0.000 claims description 25
- 230000001174 ascending effect Effects 0.000 claims description 3
- 230000005611 electricity Effects 0.000 abstract description 8
- 230000009194 climbing Effects 0.000 abstract description 3
- 230000004044 response Effects 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 description 4
- 238000010248 power generation Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 239000000446 fuel Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 230000003287 optical effect Effects 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
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- 230000005484 gravity Effects 0.000 description 1
- 238000009998 heat setting Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
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Classifications
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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
- 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
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
- F01K17/06—Returning energy of steam, in exchanged form, to process, e.g. use of exhaust steam for drying solid fuel or plant
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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
- F24D12/00—Other central heating systems
- F24D12/02—Other central heating systems having more than one heat source
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
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- Combustion & Propulsion (AREA)
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- Thermal Sciences (AREA)
- Control Of Steam Boilers And Waste-Gas Boilers (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The embodiment of the application discloses a system for realizing thermal decoupling and rapid peak shaving by utilizing a bypass, wherein high-side steam in the system drives a peak shaving generator to generate power through a back pressure steam turbine, the electric quantity generated by the peak shaving generator can be provided for an electric boiler, and the electric boiler converts the electric energy into heat energy of a heat exchange medium and then transmits the heat energy to heat network circulating water; meanwhile, the exhaust steam of the back pressure steam turbine can be utilized to heat the circulating water of the heat supply network, so that the gradient utilization of energy is realized, and compared with a high-side temperature-reducing pressure-reducing heat supply scheme, the energy utilization rate is higher. When the power grid is in low electricity consumption, the back pressure steam turbine is utilized to exhaust steam and the electric boiler is utilized to heat the circulating water of the heat supply network, so that the heat supply capacity of the unit is greatly improved, and the thermal decoupling is realized. When the power consumption of the power grid is high, the output of the back pressure turbine is reduced, the climbing capacity and the load response rate of the unit are improved, and the scheduling flexibility of the power grid is improved.
Description
Technical Field
The application relates to the technical field of thermal power generating units, in particular to a system for realizing thermal decoupling and rapid peak shaving by utilizing a bypass.
Background
In recent years, with the rapid development of renewable energy source utilization of wind power, photovoltaic and the like, the problems of wind and light abandoning in partial areas of China are increasingly prominent. Therefore, the improvement of the deep peak regulation capacity of the thermal power generating unit is one of the most direct and effective measures for solving the problem of renewable energy source consumption such as wind power. The relevant regulations mention that within four years 2016-2020, a flexible retrofit of 2.2 million kw was required, with a thermoelectric unit of 1.33 million kw (in the region of three north), and a pure condensing unit of 0.87 million kw. The peak shaving capacity is increased by 0.46 hundred million kilowatts, wherein the area in the three north is 0.45 hundred million kilowatts. These mean that the existing units have at least 20% added peak shaving capacity.
When the traditional cogeneration unit or the pure condensing unit is used for cogeneration transformation, the traditional cogeneration unit or the pure condensing unit is generally designed according to the principle of 'electricity by heat setting', and is generally operated under the load of more than 70% -80% in order to meet the heating capacity in winter, so that the power grid flexibility peak regulation capacity is poor, and the wind and light discarding problem is serious.
In order to reduce the electric load of the cogeneration unit as much as possible on the premise of meeting the heating requirement, there are currently thermoelectric decoupling methods such as direct temperature and pressure reduction by using a bypass, replacement of an optical axis by a low-pressure rotor (the low-pressure cylinder does not intake air), an electric boiler, an electric heat pump (part of heat is absorbed from circulating water), a steam heat pump (steam is discharged by using a medium-pressure cylinder), a heat storage water tank (or an energy storage device such as a heat storage brick) and the like. The bypass directly reduces the temperature and the pressure, the enthalpy drop of the steam is large, and the energy utilization efficiency is low; the rotor needs to be replaced for a long time each time when the optical axis of the low-voltage rotor is replaced, so that the continuous operation of the unit is not facilitated; the electric energy heating by the electric boiler belongs to the degradation utilization of energy sources, and the overall utilization efficiency is low; the electric heat pump, the steam heat pump, the heat storage water tank and the like have limited improvement effect on the heat supply capacity.
Disclosure of Invention
The embodiment of the application aims to provide a system for realizing thermal decoupling and rapid peak shaving by utilizing a bypass, and solves the problem of power grid peak shaving capacity.
To achieve the above object, embodiments of the present application provide a system for implementing thermal decoupling and fast peak shaving using a bypass, including: the system comprises a boiler, a superheater, a high side valve, a turbine high-pressure cylinder, a reheater, a turbine medium-pressure cylinder, a turbine low-pressure cylinder, a generator, a steam extraction regulating valve, a first heat exchanger, a heat supply network water pump, an exhaust device and a heat supply network; the output end of the boiler is connected with one end of the superheater, the other end of the superheater is connected with one end of the high-side valve and one end of the turbine high-pressure cylinder at the same time, the other end of the high-side valve is connected with the other end of the turbine high-pressure cylinder and one end of the reheater at the same time, the other end of the reheater is connected with one end of the turbine medium-pressure cylinder, the other end of the turbine medium-pressure cylinder is connected with one end of the turbine low-pressure cylinder, the third end of the turbine medium-pressure cylinder is connected with one end of the steam extraction regulating valve, the other end of the steam extraction regulating valve is connected with one end of the first heat exchanger, the generator is connected with the output end of the turbine high-pressure cylinder, the output end of the turbine medium-pressure cylinder and the output end of the turbine low-pressure cylinder at the same time, the other end of the turbine low-pressure cylinder is connected with one end of the exhaust device, the other end of the first heat exchanger is connected with the other end of the exhaust device, and the third end of the first heat exchanger is connected with the heat supply network through a heat supply pump; further comprises: back pressure turbine, electric boiler and second heat exchanger; wherein,
and the back pressure turbine is driven by the steam in the pipeline where the high side valve is positioned to generate power, electric energy is supplied to the electric boiler to heat the heat supply network circulating water in the second heat exchanger, and the heat supply capacity of the unit is improved by utilizing the steam exhausted by the back pressure turbine.
Preferably, the method further comprises: the system comprises a high side peak shaving valve, a peak shaving generator, a steam exhaust check valve, a heat exchange medium circulating pump, a peak shaving heat storage tank water outlet valve, a second heat exchanger, a peak shaving heat storage tank water inlet valve and a peak shaving heat storage tank bypass valve; wherein,
one end of the high side peak regulating valve is connected with the other end of the superheater and the other end of the high side valve at the same time, the other end of the high side peak regulating valve is connected with one end of the back pressure turbine, the other end of the back pressure turbine is connected with one end of the steam exhaust check valve, and the other end of the steam exhaust check valve is connected with the other end of the steam extraction regulating valve and one end of the first heat exchanger at the same time; the third end of the back pressure steam turbine is connected with one end of the peak shaving generator, the other end of the peak shaving generator is connected with one end of the electric boiler, the second end of the electric boiler is connected with the first end of the second heat exchanger through a heat exchange medium ascending pipeline, the third end of the electric boiler is connected with one end of the heat exchange medium circulating pump through a heat exchange medium descending pipeline, the other end of the heat exchange medium circulating pump is connected with the second end of the second heat exchanger, one end of a water outlet valve of the peak shaving heat storage tank is connected with the third end of the second heat exchanger, the other end of the water outlet valve of the peak shaving heat storage tank is connected with one end of a bypass valve of the peak shaving heat storage tank and the other end of the heat supply network at the same time, the other end of the bypass valve of the peak shaving heat storage tank is connected with one end of a water inlet valve of the first heat exchanger at the same time, and the other end of the water inlet valve of the peak shaving heat storage tank is connected with the fourth end of the second heat exchanger.
Preferably, the first heat exchanger comprises: a heat-net heat exchanger and a tubular heat exchanger; wherein,
the tubular heat exchanger is arranged in the heat supply network heat exchanger, one end of the tubular heat exchanger is connected with the other end of the exhaust device, and the other end of the tubular heat exchanger is connected with the middle pressure cylinder of the steam turbine through the steam extraction regulating valve and is connected with the back pressure steam turbine through the steam exhaust check valve; one end of the heat supply network heat exchanger is simultaneously connected with the other end of the peak shaving heat storage tank bypass valve and one end of the peak shaving heat storage tank water inlet valve, and the other end of the heat supply network heat exchanger is connected with the heat supply network water pump.
Preferably, the second heat exchanger includes: a peak-shaving heat storage tank and a coil heat exchanger; wherein,
the coil heat exchanger is arranged in the peak shaving heat storage tank, and the top port of the peak shaving heat storage tank is connected with the electric boiler through a heat exchange medium uplink pipeline; the lower port of the peak shaving heat storage tank is connected with the heat exchange medium circulating pump through a heat exchange medium downlink pipeline; the bottom port of the coil heat exchanger is connected with the water inlet valve of the peak shaving heat storage tank, and the top port of the coil heat exchanger is connected with the water outlet valve of the peak shaving heat storage tank.
Preferably, the steam extraction regulating valve is a four-section type air extraction regulating valve.
Compared with the prior art, the high-side steam in the system drives the peak shaving generator to generate power through the back pressure steam turbine, the electric quantity generated by the peak shaving generator can be provided for the electric boiler, and the electric boiler converts the electric energy into heat energy (desalted water or other mediums) of a heat exchange medium and then transmits the heat energy to the heat supply network circulating water; meanwhile, the exhaust steam of the back pressure steam turbine can be utilized to heat the circulating water of the heat supply network, so that the gradient utilization of energy is realized, and compared with a high-side temperature-reducing pressure-reducing heat supply scheme, the energy utilization rate is higher. When the power grid is in low electricity consumption, the back pressure steam turbine is utilized to exhaust steam and the electric boiler is utilized to heat the circulating water of the heat supply network, so that the heat supply capacity of the unit is greatly improved, and the thermal decoupling is realized. When the power consumption of the power grid is high, the output of the back pressure turbine is reduced, the climbing capacity and the load response rate of the unit are improved, and the scheduling flexibility of the power grid is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic connection diagram of a system for implementing thermal decoupling and rapid peak adjustment by using a bypass according to an embodiment of the present application.
The attached drawings are identified:
1. boiler 2, superheater 3, high side peak-shaving valve 5, high side valve 6 and high pressure cylinder of steam turbine
7. Reheater 8, turbine intermediate pressure cylinder 9, turbine low pressure cylinder 10, generator 11, extraction regulating valve
12. Peak regulating generator 13, back pressure turbine 14, steam exhaust check valve 15 and peak regulating generator outlet bus
16. Electric boiler 17, heat exchange medium up-line 18, heat exchange medium down-line 19, heat exchange medium circulation pump
20. Peak-regulating heat-accumulating tank water outlet valve 21, peak-regulating heat-accumulating tank 22, coiled heat exchanger 23 and peak-regulating heat-accumulating tank water inlet valve
24. Peak-shaving heat-storage tank bypass valve 25, heat-supply network heat exchanger 26, tubular heat exchanger 27 and heat-supply network water pump
28. Exhaust 29 heat supply network
Detailed Description
In order to make the technical solutions in the present application better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are intended to be within the scope of the present disclosure.
On the basis of guaranteeing a thermodynamic system of the unit and a conventional flow of power generation, the scheme is newly provided with a system for generating power and accumulating heat by utilizing high-side steam, and aims to drive the back pressure steam turbine to generate power by utilizing bypass steam to supply the power to the electric boiler so as to heat the heat supply network circulating water in the peak shaving heat exchanger, and simultaneously, the back pressure steam turbine is utilized to exhaust steam, so that the heat supply capacity of the unit is improved.
Based on this, a system for implementing thermal decoupling and rapid peak shaving by using bypass is provided in the embodiment of the present application, as shown in fig. 1. Comprising the following steps: the boiler 1, the superheater 2, the high side peak shaving valve 3, the high side valve 5, the turbine high pressure cylinder 6, the reheater 7, the turbine intermediate pressure cylinder 8, the turbine low pressure cylinder 9, the generator 10, the steam extraction regulating valve 11, the peak shaving generator 12, the back pressure turbine 13, the steam exhaust check valve 14, the electric boiler 16, the heat exchange medium circulating pump 19, the peak shaving heat storage tank water outlet valve 20, the first heat exchanger, the second heat exchanger, the peak shaving heat storage tank water inlet valve 23, the peak shaving heat storage tank bypass valve 24, the heat supply network water pump 27, the exhaust device 28 and the heat supply network 29.
The output end of the boiler 1 is connected with one end of the superheater 2, the other end of the superheater 2 is simultaneously connected with one end of the Gao Bangfa and one end of the turbine high pressure cylinder 6, the other end of the high bypass valve 5 is simultaneously connected with the other end of the turbine high pressure cylinder 6 and one end of the reheater 7, the other end of the reheater 7 is connected with one end of the turbine intermediate pressure cylinder 8, the other end of the turbine intermediate pressure cylinder 8 is connected with one end of the turbine low pressure cylinder 9, the third end of the turbine intermediate pressure cylinder 8 is connected with one end of the extraction regulating valve 11, the other end of the extraction regulating valve 11 is connected with one end of the first heat exchanger, the generator 10 is simultaneously connected with the output end of the turbine high pressure cylinder 6, the output end of the turbine intermediate pressure cylinder 8 and the output end of the turbine low pressure cylinder 9, the other end of the turbine low pressure cylinder 9 is connected with one end of the exhaust device 28, the other end of the first heat exchanger is connected with one end of the exhaust device 28, and the other end of the first heat exchanger is connected with the first heat exchanger through the heat exchanger net 29; one end of the high side peak regulating valve 3 is simultaneously connected with the other end of the superheater 2 and the other end of the high side valve 5, the other end of the high side peak regulating valve 3 is connected with one end of the back pressure turbine 13, the other end of the back pressure turbine 13 is connected with one end of the steam exhaust check valve 14, and the other end of the steam exhaust check valve 14 is simultaneously connected with the other end of the steam extraction regulating valve 11 and one end of the first heat exchanger; the third end of the back pressure turbine 13 is connected with one end of the peak shaving generator 12, the other end of the peak shaving generator 12 is connected with one end of the electric boiler 16 through a peak shaving generator outlet bus 15, the second end of the electric boiler 16 is connected with the first end of the second heat exchanger through a heat exchange medium uplink 17, the third end of the electric boiler 16 is connected with one end of the heat exchange medium circulating pump 19 through a heat exchange medium downlink 18, the other end of the heat exchange medium circulating pump 19 is connected with the second end of the second heat exchanger, one end of the peak shaving heat storage tank outlet valve 20 is connected with the third end of the second heat exchanger, the other end of the peak shaving heat storage tank outlet valve 20 is simultaneously connected with one end of the peak shaving heat storage tank bypass valve 24 and the other end of the heat supply network 29, the other end of the peak shaving heat storage tank inlet valve 24 is simultaneously connected with one end of the peak shaving heat storage tank inlet valve 23 and the fourth end of the first heat exchanger, and the other end of the peak shaving heat storage tank inlet valve 23 is simultaneously connected with the fourth end of the second heat exchanger.
As can be seen from fig. 1, the first heat exchanger comprises: a heat network heat exchanger 25 and a tubular heat exchanger 26; wherein the tubular heat exchanger 26 is arranged in the heat supply network heat exchanger 25, one end of the tubular heat exchanger 26 is connected with the other end of the exhaust device 28, and the other end of the tubular heat exchanger 26 is connected with the intermediate pressure cylinder 8 of the steam turbine through the steam extraction regulating valve 11 and is connected with the back pressure steam turbine 13 through the steam extraction check valve 14; one end of the heat supply network heat exchanger 25 is simultaneously connected with the other end of the peak shaving heat storage tank bypass valve 24 and one end of the peak shaving heat storage tank water inlet valve 23, and the other end of the heat supply network heat exchanger 25 is connected with the heat supply network water pump 27.
As can be seen from fig. 1, the second heat exchanger comprises: a peak shaving heat storage tank 21 and a coil heat exchanger 22; the coil heat exchanger 22 is arranged in the peak shaving heat storage tank 21, and the top port of the peak shaving heat storage tank 21 is connected with the electric boiler 16 through a heat exchange medium uplink pipeline 17; the lower port of the peak shaving heat storage tank 21 is connected with the heat exchange medium circulating pump 19 through a heat exchange medium downlink pipeline 18; the bottom port of the coil heat exchanger 22 is connected with the peak shaving heat storage tank water inlet valve 23, and the top port of the coil heat exchanger 22 is connected with the peak shaving heat storage tank water outlet valve 20.
In the normal mode, the unit works according to the conventional power generation flow, namely, steam generated by the boiler 1 is heated by the superheater 2 and then converted into qualified steam, the qualified steam is discharged into the reheater 7 after being subjected to work by the turbine high-pressure cylinder 6, the steam heated by the reheater 7 sequentially enters the turbine medium-pressure cylinder 8 and the turbine low-pressure cylinder 9 to do work, and the discharged steam (the steam after work) of the turbine low-pressure cylinder 9 enters the exhaust device 28 to be cooled. When the unit supplies heat, the steam extraction regulating valve 11 is opened, and the discharged steam enters the heat supply network heat exchanger 25 to exchange heat with the heat supply network circulating water, so that the requirement of the heat supply network 29 is met. However, when the grid load is low, the steam merely relying on the steam extraction regulating valve cannot meet the requirements of the heat supply network 29, and the contradiction between the heat load and the electric load is prominent.
When the power consumption of the power grid is changed from peak to valley, and the heat supply provided by the existing load of the unit cannot meet the requirements of users along with the reduction of the load of the unit, the unit enters a power generation and heat supply mode: the high-side peak regulating valve 3 is opened to supply steam to the back pressure turbine 13, the back pressure turbine 13 drives the coaxial peak regulating generator 12 to generate electricity, the generated electricity can be partially or completely supplied to the electric boiler 16 for use, the electric boiler 16 consumes the electricity and converts the electricity into heat energy of heat exchange media (desalted water or other media), the heated heat exchange media enter the top of the peak regulating heat storage tank 21 through the heat exchange media ascending pipeline 17, flow to the bottom of the peak regulating heat storage tank 21 under the self gravity and the suction force of the heat exchange media circulating pump 19, and exchange heat with heat network circulating water in the coil heat exchanger 22, and the cooled heat exchange media enter the electric boiler 16 for reheating through the heat exchange media circulating pump 19 and the heat exchange media descending pipeline 18. The heat supply network circulating water enters the coiled heat exchanger 22 from the peak shaving heat storage tank water inlet valve 23, is discharged out of the heat supply network circulating water through the peak shaving heat storage tank water outlet valve 20 after being heated, and returns to the heat supply network system 29.
In normal operation, the peak shaving heat storage tank 21 maintains a certain liquid level, and the heat absorption capacity of the heat exchange medium is regulated by regulating the power of the electric boiler 16, so that the temperature of the heat supply network circulating water is ensured to meet the requirement. Meanwhile, exhaust steam of the back pressure steam turbine 13 enters the heat supply network heat exchanger 25 through the exhaust steam check valve 14 and the regulating valve 11 to exchange heat with heat supply network circulating water, so that the water temperature and heat exchange quantity of the heat supply network are improved, the heat supply capacity of the unit is greatly improved, and thermal decoupling is realized.
When the power grid power consumption is changed from peak to valley, although the boiler fuel quantity is reduced along with load, the boiler 1 has larger thermal inertia to limit the load reduction rate of the unit, and at the moment, the back pressure turbine 13 and the peak shaving generator 12 can be started by opening the high side peak shaving valve 3, so that the steam inlet quantity of the high pressure cylinder 6 of the turbine is reduced, the power generation function of the turbine is reduced, and the rapid load reduction is realized.
When the power grid electricity is changed from low to high, the fuel quantity is gradually increased by the boiler, and meanwhile, the steam inlet quantity of the back pressure turbine 13 is reduced by adjusting the opening degree of the high side peak regulating valve 3, so that the output of the back pressure turbine 13 is rapidly reduced, and then the steam inlet quantity of the high pressure cylinder 6 of the turbine is rapidly increased, and the climbing capacity and the load response rate of the unit are improved. When the unit reaches a certain load, the heat supply requirement can be met only by the 4 th-stage air extraction and heat exchange quantity of the air extraction regulating valve 11, the high-side peak regulating valve 3 can be fully closed, the back pressure turbine 13 is stopped, and the peak regulating generator 12 is stopped at the same time, so that the unit is restored to a normal mode.
According to the embodiment, the technical scheme utilizes the high-pressure bypass of the steam turbine to improve the flexibility peak regulation capacity of the cogeneration unit, namely, the heating requirement of the unit can be met under the low-load working condition, and meanwhile, certain quick load regulation capacity can be met.
Although the present application has been described by way of embodiments, those of ordinary skill in the art will recognize that there are many variations and modifications of the present application without departing from the spirit of the present application, and it is intended that the appended claims encompass such variations and modifications without departing from the spirit of the present application.
Claims (2)
1. A system for implementing thermal decoupling and fast peak shaving using bypass, comprising: the system comprises a boiler (1), a superheater (2), a high side valve (5), a turbine high pressure cylinder (6), a reheater (7), a turbine medium pressure cylinder (8), a turbine low pressure cylinder (9), a generator (10), a steam extraction regulating valve (11), a first heat exchanger, a heat supply network water pump (27), an exhaust device (28) and a heat supply network (29); the output end of the boiler (1) is connected with one end of the superheater (2), the other end of the superheater (2) is connected with one end of the Gao Bangfa (5) and one end of the turbine high-pressure cylinder (6) at the same time, the other end of the Gao Bangfa (5) is connected with the other end of the turbine high-pressure cylinder (6) and one end of the reheater (7) at the same time, the other end of the reheater (7) is connected with one end of the turbine medium-pressure cylinder (8), the other end of the turbine medium-pressure cylinder (8) is connected with one end of the turbine low-pressure cylinder (9), the third end of the turbine medium-pressure cylinder (8) is connected with one end of the extraction regulating valve (11), the other end of the extraction regulating valve (11) is connected with one end of the first heat exchanger, the generator (10) is connected with the output end of the turbine high-pressure cylinder (6), the output end of the turbine medium-pressure cylinder (8) is connected with the output end of the turbine low-pressure cylinder (9), the output end of the turbine medium-pressure cylinder (9) is connected with the other end of the heat exchanger (28) of the first heat exchanger through the heat exchanger;
characterized by further comprising: a back pressure turbine (13), an electric boiler (16) and a second heat exchanger; wherein,
the steam in the pipeline where Gao Bangfa (5) is located is utilized to drive the back pressure steam turbine (13) to generate power, electric energy is provided for the electric boiler (16) to heat the heat supply network circulating water in the second heat exchanger, and meanwhile, the back pressure steam turbine (13) is utilized to exhaust steam, so that the heat supply capacity of the unit is improved;
the system further comprises: the system comprises a high side peak shaving valve (3), a peak shaving generator (12), a steam exhaust check valve (14), a heat exchange medium circulating pump (19), a peak shaving heat storage tank water outlet valve (20), a second heat exchanger, a peak shaving heat storage tank water inlet valve (23) and a peak shaving heat storage tank bypass valve (24); wherein,
one end of the high side peak regulating valve (3) is connected with the other end of the superheater (2) and the other end of the Gao Bangfa (5) at the same time, the other end of the high side peak regulating valve (3) is connected with one end of the back pressure turbine (13), the other end of the back pressure turbine (13) is connected with one end of the steam exhaust check valve (14), and the other end of the steam exhaust check valve (14) is connected with the other end of the steam extraction regulating valve (11) and one end of the first heat exchanger at the same time; the third end of the back pressure turbine (13) is connected with one end of the peak shaving generator (12), the other end of the peak shaving generator (12) is connected with one end of the electric boiler (16), the second end of the electric boiler (16) is connected with the first end of the second heat exchanger through a heat exchange medium ascending pipeline (17), the third end of the electric boiler (16) is connected with one end of the heat exchange medium circulating pump (19) through a heat exchange medium descending pipeline (18), the other end of the heat exchange medium circulating pump (19) is connected with the second end of the second heat exchanger, one end of the peak shaving heat storage tank water outlet valve (20) is connected with the third end of the second heat exchanger, the other end of the peak shaving heat storage tank water outlet valve (20) is simultaneously connected with one end of the peak shaving heat storage tank bypass valve (24) and the other end of the heat network (29), the other end of the peak shaving heat storage tank bypass valve (24) is simultaneously connected with one end of the peak shaving heat storage tank water inlet valve (23) and the fourth end of the first heat exchanger, and the other end of the peak shaving heat storage tank (23) is simultaneously connected with the second heat exchanger;
the first heat exchanger includes: a heat network heat exchanger (25) and a tubular heat exchanger (26); wherein,
the tubular heat exchanger (26) is arranged in the heat supply network heat exchanger (25), one end of the tubular heat exchanger (26) is connected with the other end of the exhaust device (28), and the other end of the tubular heat exchanger (26) is connected with the middle pressure cylinder (8) of the steam turbine through the steam extraction regulating valve (11) and is connected with the back pressure steam turbine (13) through the steam exhaust check valve (14); one end of the heat supply network heat exchanger (25) is simultaneously connected with the other end of the peak shaving heat storage tank bypass valve (24) and one end of the peak shaving heat storage tank water inlet valve (23), and the other end of the heat supply network heat exchanger (25) is connected with the heat supply network water pump (27);
the second heat exchanger includes: a peak-shaving heat storage tank (21) and a coil heat exchanger (22); wherein,
the coil heat exchanger (22) is arranged in the peak shaving heat storage tank (21), and the top port of the peak shaving heat storage tank (21) is connected with the electric boiler (16) through a heat exchange medium uplink pipeline (17); the lower port of the peak shaving heat storage tank (21) is connected with the heat exchange medium circulating pump (19) through a heat exchange medium downlink pipeline (18); the bottom port of the coil heat exchanger (22) is connected with the peak shaving heat storage tank water inlet valve (23), and the top port of the coil heat exchanger (22) is connected with the peak shaving heat storage tank water outlet valve (20).
2. The system of claim 1, wherein the extraction control valve is a four-stage extraction control valve.
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