CN108678819A - A kind of system for realizing thermoelectricity decoupling and quick peak regulation using bypass - Google Patents
A kind of system for realizing thermoelectricity decoupling and quick peak regulation using bypass Download PDFInfo
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- CN108678819A CN108678819A CN201810365634.5A CN201810365634A CN108678819A CN 108678819 A CN108678819 A CN 108678819A CN 201810365634 A CN201810365634 A CN 201810365634A CN 108678819 A CN108678819 A CN 108678819A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 59
- 238000005338 heat storage Methods 0.000 claims description 63
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- 238000010248 power generation Methods 0.000 abstract description 9
- 230000005611 electricity Effects 0.000 abstract description 6
- 230000009194 climbing Effects 0.000 abstract description 3
- 238000010438 heat treatment Methods 0.000 description 6
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- 239000000446 fuel Substances 0.000 description 2
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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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The application embodiment discloses a kind of system for realizing thermoelectricity decoupling and quick peak regulation using bypass, the other steam of height in this system first passes through back pressure turbine and drives the power generation of peaking generation machine, the electricity that peaking generation machine is sent out can be supplied to electric boiler, the thermal energy that electric boiler is converted into electric energy heat transferring medium to pass to heat supply network recirculated water again；The steam discharge of back pressure turbine can be utilized to heat heat supply network recirculated water simultaneously, realize the cascade utilization of energy, compare high-pressure bypass pressure and temperature reducing heat supply scheme, energy utilization rate is higher.In power grid low power consumption, using back pressure turbine steam discharge and grill pan stove heat heat supply network recirculated water, unit heat capacity is greatly improved, realizes thermoelectricity decoupling.In power grid peak of power consumption, the output of back pressure turbine is reduced, unit climbing capacity and load -response-speed is improved, improves the flexibility of dispatching of power netwoks.
Description
Technical Field
The application relates to the technical field of thermal power generating units, in particular to a system for realizing thermoelectric decoupling and rapid peak regulation by utilizing a bypass.
Background
With the rapid development of the utilization of renewable energy sources such as wind power, photovoltaic and the like in recent years, the problems of wind abandoning and light abandoning in partial areas of China are increasingly highlighted. Therefore, the improvement of the deep peak regulation capability of the thermal power generating unit is one of the most direct and effective measures for solving the problem of the consumption of renewable energy sources such as wind power and the like. Relevant regulations mention that in the four years 2016-. The peak regulation capacity is increased by 0.46 hundred million kilowatts, wherein the peak regulation capacity is increased by 0.45 hundred million kilowatts in the three-north area. These mean that existing units have at least a 20% increase in peak shaving capacity.
When a traditional combined heat and power generation unit or a straight condensing unit is used for combined heat and power generation transformation, the traditional combined heat and power generation unit or straight condensing unit is generally designed according to the principle of 'fixing power by heat', and in order to meet the heating capacity in winter, the traditional combined heat and power generation unit or straight condensing unit generally operates at more than 70% -80% of load, so that the flexibility peak regulation capacity of a power grid is poor, and the problems of wind abandoning and light abandoning are.
In order to reduce the electric load of the cogeneration unit as much as possible on the premise of meeting the heating requirement, currently, there are available methods of direct temperature and pressure reduction by using a bypass, optical axis replacement by a low-pressure rotor (a low-pressure cylinder does not admit air), an electric boiler, an electric heat pump (absorbing part of heat from circulating water), a steam heat pump (exhausting steam 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. Wherein, the enthalpy drop of the bypass direct temperature and pressure reduction steam is large, and the energy utilization efficiency is low; the replacement of the optical axis of the low-voltage rotor needs a long time to replace the rotor each time, which is not beneficial to the continuous operation of the unit; the electric energy utilized by the electric boiler is used for heating, which belongs to the degradation utilization of energy sources and has low overall utilization efficiency; the electric heat pump, the steam heat pump, the heat storage water tank and the like have limited effect on improving the heat supply capacity.
Disclosure of Invention
The purpose of the embodiment of the application is to provide a system for realizing thermoelectric decoupling and rapid peak regulation by utilizing a bypass, and the problem of the peak regulation capability of a power grid is solved.
To achieve the above object, the present application provides a system for thermoelectric decoupling and fast peak shaving using a bypass, comprising: the system comprises a boiler, a superheater, a high side valve, a high pressure cylinder of a steam turbine, a reheater, a medium pressure cylinder of the steam turbine, a low pressure cylinder of the steam turbine, 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 simultaneously connected with one end of the high side valve and one end of the high pressure cylinder of the steam turbine, the other end of the high side valve is simultaneously connected with the other end of the high pressure cylinder of the steam turbine and one end of the reheater, the other end of the reheater is connected with one end of the intermediate pressure cylinder of the steam turbine, the other end of the intermediate pressure cylinder of the steam turbine is connected with one end of the low pressure cylinder of the steam turbine, the third end of the intermediate pressure cylinder of the steam turbine 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 simultaneously connected with the output end of the high pressure cylinder of the steam turbine, the output end of the intermediate pressure cylinder of the steam turbine and the output end, 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 one end of the heat supply network through a heat supply network water pump; further comprising: the back pressure steam turbine, the electric boiler and the second heat exchanger; wherein,
and the steam in the pipeline where the high bypass valve is located is used for driving the backpressure steam turbine to generate electricity, electric energy is supplied to the electric boiler to heat the circulating water of the heat supply network in the second heat exchanger, and meanwhile, the heat supply capacity of the unit is improved by utilizing the steam exhaust of the backpressure steam turbine.
Preferably, the method further comprises the following steps: the system comprises a high side peak regulating valve, a peak regulating generator, a steam exhaust check valve, a heat exchange medium circulating pump, a peak regulating heat storage tank water outlet valve, a second heat exchanger, a peak regulating heat storage tank water inlet valve and a peak regulating 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 backpressure steam turbine is connected with one end of the peak regulation generator, the other end of the peak regulation 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 peak regulation heat storage tank water outlet valve is connected with the third end of the second heat exchanger, the other end of the peak regulation heat storage tank water outlet valve is simultaneously connected with one end of a peak regulation heat storage tank bypass valve and the other end of the heat supply network, and the other end of the peak regulation heat storage tank bypass valve is simultaneously connected with one end of a peak regulation heat storage tank water inlet valve and the fourth end of the first heat exchanger, and the other end of the peak-shaving heat storage tank water inlet valve is connected with the fourth end of the second heat exchanger.
Preferably, the first heat exchanger comprises: heat supply network heat exchangers and tubular heat exchangers; 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 steam turbine intermediate pressure cylinder through the steam extraction regulating valve and is connected with the back pressure steam turbine through the steam extraction check valve; one end of the heat supply network heat exchanger is simultaneously connected with the other end of the peak regulation heat storage tank bypass valve and one end of the peak regulation 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 comprises: the peak-shaving heat storage tank and the coil type heat exchanger; wherein,
the coil pipe type heat exchanger is arranged in the peak-shaving heat storage tank, and a top port of the peak-shaving heat storage tank is connected with the electric boiler through a heat exchange medium ascending 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 descending pipeline; the bottom port of the coil type heat exchanger is connected with a water inlet valve of the peak-shaving heat storage tank, and the top port of the coil type heat exchanger is connected with a 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.
Therefore, compared with the prior art, high-side steam in the system drives the peak shaving generator to generate electricity through the back pressure turbine, the electricity generated by the peak shaving generator can be supplied to the electric boiler, and the electric boiler converts the electric energy into heat energy (demineralized water or other media) of a heat exchange medium and then transfers the heat energy to circulating water of a heat supply network; meanwhile, the exhaust steam of the back pressure turbine can be utilized to heat the circulating water of the heat supply network, the gradient utilization of energy is realized, and the energy utilization rate is higher compared with a high-side temperature and pressure reduction heat supply scheme. When the power consumption of the power grid is low, the back pressure steam turbine exhaust and the electric boiler are used for heating the circulating water of the heat supply network, so that the heat supply capacity of the unit is greatly improved, and the thermoelectric decoupling is realized. And when the power consumption of the power grid is in a peak, the output of the backpressure steam turbine is reduced, the climbing capacity and the load response rate of the unit are improved, and the flexibility of power grid dispatching 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 needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a connection diagram of a system for implementing thermoelectric decoupling and fast peak shaving by using a bypass according to an embodiment of the present application.
The attached drawings are as follows:
1. boiler 2, superheater 3, high side peak regulating 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, steam extraction regulating valve
12. Peak-shaving generator 13, backpressure steam turbine 14, exhaust check valve 15 and peak-shaving generator outlet bus
16. Electric boiler 17, heat exchange medium ascending pipeline 18, heat exchange medium descending pipeline 19 and heat exchange medium circulating pump
20. A peak-shaving heat storage tank water outlet valve 21, a peak-shaving heat storage tank 22, a coil type heat exchanger 23 and a peak-shaving heat storage tank water inlet valve
24. Peak-regulating 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 heating network
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, 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 a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art without any inventive work based on the embodiments in the present application shall fall within the scope of protection of the present application.
On the basis of guaranteeing a thermodynamic system and a conventional power generation flow of a unit, a system for generating power and storing heat by utilizing high bypass steam is newly added, and the purpose is to utilize the bypass steam to drive a backpressure steam turbine to generate power and provide the power to an electric boiler so as to heat supply network circulating water in a peak shaving heat exchanger, and simultaneously utilize the backpressure steam turbine to exhaust steam, thereby improving the heat supply capacity of the unit.
Based on this, the embodiment of the present application proposes a system for implementing thermoelectric decoupling and fast peak shaving by using a bypass, as shown in fig. 1. The method comprises the following steps: the system comprises a boiler 1, a superheater 2, a high side peak regulating valve 3, a high side valve 5, a high pressure turbine cylinder 6, a reheater 7, a medium pressure turbine cylinder 8, a low pressure turbine cylinder 9, a generator 10, a steam extraction regulating valve 11, a peak regulating generator 12, a backpressure turbine 13, a steam exhaust check valve 14, an electric boiler 16, a heat exchange medium circulating pump 19, a peak regulating heat storage tank water outlet valve 20, a first heat exchanger, a second heat exchanger, a peak regulating heat storage tank water inlet valve 23, a peak regulating heat storage tank bypass valve 24, 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 simultaneously connected with one end of the high side valve 5 and one end of the steam turbine high pressure cylinder 6, the other end of the high side valve 5 is simultaneously connected with the other end of the steam 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 steam turbine intermediate pressure cylinder 8, the other end of the steam turbine intermediate pressure cylinder 8 is connected with one end of the steam turbine low pressure cylinder 9, the third end of the steam turbine intermediate pressure cylinder 8 is connected with one end of the steam extraction regulating valve 11, the other end of the steam extraction regulating valve 11 is connected with one end of the first heat exchanger, and the generator 10 is simultaneously connected with the output end of the steam turbine high pressure cylinder 6, the output end of the steam turbine intermediate pressure cylinder 8 and the output end of the, the other end of the steam 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 the other end of the exhaust device 28, and the third end of the first heat exchanger is connected with one end of the heat supply network 29 through a heat supply network water pump 27; 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 backpressure steam turbine 13 is connected with one end of the peak regulation generator 12, the other end of the peak regulation generator 12 is connected with one end of the electric boiler 16 through a peak regulation 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 ascending pipeline 17, the third end of the electric boiler 16 is connected with one end of a 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 a peak regulation heat storage tank outlet valve 20 is connected with the third end of the second heat exchanger, the other end of the peak regulation heat storage tank outlet valve 20 is simultaneously connected with one end of the peak regulation heat storage tank valve 24 and the other end of the heat network 29, the other end of the peak regulation heat storage tank bypass valve 24 is simultaneously connected with one end of a peak regulation heat storage tank inlet valve 23, And the fourth end of the first heat exchanger is connected at the same time, and the other end of the peak shaving heat storage tank water inlet valve 23 is connected with the fourth end of the second heat exchanger.
As can be seen from fig. 1, the first heat exchanger comprises: a heat grid heat exchanger 25 and a tubular heat exchanger 26; 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 turbine intermediate pressure cylinder 8 through the extraction regulating valve 11 and is also connected with the back pressure turbine 13 through the exhaust check valve 14; one end of the heat supply network heat exchanger 25 is simultaneously connected with the other end of the peak regulation heat storage tank bypass valve 24 and one end of the peak regulation 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 type heat exchanger 22; the coil type 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 ascending 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 descending pipeline 18; the bottom port of the coil type heat exchanger 22 is connected with the peak regulation heat storage tank water inlet valve 23, and the top port of the coil type heat exchanger 22 is connected with the peak regulation heat storage tank water outlet valve 20.
In a normal mode, the unit works according to a conventional power generation flow, namely, steam generated by a boiler 1 is heated by a heater 2 and then converted into qualified steam, the qualified steam does work by a high-pressure steam turbine cylinder 6 and then is exhausted to a reheater 7, the steam heated by the reheater 7 sequentially enters a medium-pressure steam turbine cylinder 8 and a low-pressure steam turbine cylinder 9 to do work, and the exhausted steam (the steam after doing work) of the low-pressure steam turbine cylinder 9 enters an 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 circulating water of the heat supply network, so that the requirement of the heat supply network 29 is met. However, when the load of the power grid is low, the requirement of the heat supply network 29 cannot be met only by the steam of the steam extraction regulating valve, and the contradiction between the heat load and the electric load is prominent.
The power consumption of the power grid is changed into the valley from the peak, and along with the reduction of the unit load, when the heat supply provided by the current load of the unit can not meet the demand of the user, the unit enters a power generation and heat supply mode: the method comprises the steps that a high-side peak regulating valve 3 is opened to supply steam to a back pressure turbine 13, the back pressure turbine 13 drives a coaxial peak regulating generator 12 to generate electricity, part or all of generated electricity can be supplied to an electric boiler 16 to be used, the electric boiler 16 consumes electric energy and converts the electric energy into heat energy of a heat exchange medium (demineralized water or other media), the heated heat exchange medium enters the top of a peak regulating heat storage tank 21 through a heat exchange medium ascending pipeline 17 and flows to the bottom of the peak regulating heat storage tank 21 under the self gravity and the suction force of a heat exchange medium circulating pump 19 to exchange heat with heat supply network circulating water in a coil pipe type heat exchanger 22, and the cooled heat exchange medium enters the electric boiler 16 to be heated again through the heat exchange medium circulating pump 19 and a heat. The heat supply network circulating water enters the coil type heat exchanger 22 from the peak-shaving heat storage tank water inlet valve 23, is heated and then is discharged out of the heat supply network circulating water through the peak-shaving heat storage tank water outlet valve 20 and returns to the heat supply network system 29.
During normal operation, the peak-shaving heat storage tank 21 keeps a certain liquid level, and the heat absorption capacity of the heat exchange medium is adjusted by adjusting the power of the electric boiler 16, so that the temperature of the circulating water of the heat supply network is ensured to meet the requirement. Meanwhile, the 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 the heat supply network circulating water, so that the water temperature and the heat exchange quantity of the heat supply network are improved, the heat supply capacity of the unit is greatly improved, and the thermoelectric decoupling is realized.
When the power consumption of a power grid is shifted to the valley from the peak, although the fuel quantity of the boiler is reduced along with the load, the boiler 1 has larger thermal inertia to limit the load reduction rate of the unit, and at the moment, the backpressure 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 turbine high-pressure cylinder 6 is reduced, the power generation and work applying capacity of the turbine is reduced, and the load reduction is realized quickly.
When the power consumption of the power grid is changed into a peak from a valley, the opening of the high side peak regulating valve 3 is adjusted while the fuel quantity of the boiler is gradually increased, the steam inlet quantity of the back pressure steam turbine 13 is reduced, the output of the back pressure steam turbine 13 is rapidly reduced, then the steam inlet quantity of the steam turbine high pressure cylinder 6 is rapidly increased, and therefore the climbing capacity and the load response rate of the unit are improved. When the unit reaches a certain load and the heat supply requirement can be met only by the 4 th-stage air extraction and heat exchange quantity of the steam extraction regulating valve 11, the high-side peak regulating valve 3 can be fully closed, the back pressure turbine 13 is shut down, and the peak regulating generator 12 is also shut down, so that the unit is recovered 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, a certain rapid load regulation capacity can also be met.
Although the present application has been described in terms of embodiments, those of ordinary skill in the art will recognize that there are numerous variations and permutations of the present application without departing from the spirit of the application, and it is intended that the appended claims encompass such variations and permutations without departing from the spirit of the application.
Claims (5)
1. A system for thermoelectric decoupling and fast peak shaving with bypass, comprising: the system comprises a boiler (1), a superheater (2), a high side valve (5), a steam turbine high pressure cylinder (6), a reheater (7), a steam turbine intermediate pressure cylinder (8), a steam 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 a high side valve (5) and one end of a steam turbine high-pressure cylinder (6) at the same time, the other end of the high side valve (5) is connected with the other end of the steam turbine high-pressure cylinder (6) and one end of a reheater (7) at the same time, the other end of the reheater (7) is connected with one end of a steam turbine intermediate-pressure cylinder (8), the other end of the steam turbine intermediate-pressure cylinder (8) is connected with one end of a steam turbine low-pressure cylinder (9), the third end of the steam turbine intermediate-pressure cylinder (8) is connected with one end of a steam extraction regulating valve (11), the other end of the steam extraction regulating valve (11) is connected with one end of a first heat exchanger, and the generator (10) is connected with the output end of the steam turbine high, The output end of the turbine intermediate pressure cylinder (8) and the output end of the turbine low pressure cylinder (9) are connected, 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 the other end of the exhaust device (28), and the third end of the first heat exchanger is connected with one end of the heat supply network (29) through a heat supply network water pump (27);
it is characterized by also comprising: a backpressure steam turbine (13), an electric boiler (16) and a second heat exchanger; wherein,
and driving the backpressure steam turbine (13) to generate power by using the steam in the pipeline where the high side valve (5) is positioned, supplying electric energy to the electric boiler (16) to heat the heat supply network circulating water in the second heat exchanger, and simultaneously discharging steam by using the backpressure steam turbine (13) to improve the heat supply capacity of the unit.
2. The system of claim 1, further comprising: a high side peak regulating valve (3), a peak regulating generator (12), a steam exhaust check valve (14), a heat exchange medium circulating pump (19), a peak regulating heat storage tank water outlet valve (20), a second heat exchanger, a peak regulating heat storage tank water inlet valve (23) and a peak regulating 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 high side valve (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 backpressure steam 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 a 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 a 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 a 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 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 water inlet valve (23) is connected with the fourth end of the second heat exchanger.
3. The system of claim 2, wherein 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), the other end of the tubular heat exchanger (26) is connected with the steam turbine intermediate pressure cylinder (8) through the steam extraction regulating valve (11), and is connected with the back pressure steam turbine (13) through the steam extraction check valve (14) at the same time; one end of the heat supply network heat exchanger (25) is simultaneously connected with the other end of the peak regulation heat storage tank bypass valve (24) and one end of the peak regulation 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).
4. The system of claim 2, wherein the second heat exchanger comprises: a peak-shaving heat storage tank (21) and a coil type 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 ascending 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 descending pipeline (18); the bottom port of the coil type heat exchanger (22) is connected with the peak regulation heat storage tank water inlet valve (23), and the top port of the coil type heat exchanger (22) is connected with the peak regulation heat storage tank water outlet valve (20).
5. The system of claim 1, wherein the extraction adjustment valve is a four-stage extraction adjustment valve.
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