CN116877973A - Energy cascade utilization system and method applied to condensation back-pumping heat supply unit - Google Patents
Energy cascade utilization system and method applied to condensation back-pumping heat supply unit Download PDFInfo
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- CN116877973A CN116877973A CN202310799076.4A CN202310799076A CN116877973A CN 116877973 A CN116877973 A CN 116877973A CN 202310799076 A CN202310799076 A CN 202310799076A CN 116877973 A CN116877973 A CN 116877973A
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000009833 condensation Methods 0.000 title claims abstract description 13
- 230000005494 condensation Effects 0.000 title claims abstract description 13
- 238000005086 pumping Methods 0.000 title abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 30
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 230000001105 regulatory effect Effects 0.000 claims description 29
- 230000001360 synchronised effect Effects 0.000 claims description 5
- 230000007423 decrease Effects 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000004134 energy conservation Methods 0.000 abstract description 2
- 238000000926 separation method Methods 0.000 abstract 1
- 238000007599 discharging Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/32—Feed-water heaters, i.e. economisers or like preheaters arranged to be heated by steam, e.g. bled from turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/12—Controlling superheat temperature by attemperating the superheated steam, e.g. by injected water sprays
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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
- F24D18/00—Small-scale combined heat and power [CHP] generation systems specially adapted for domestic heating, space heating or domestic hot-water supply
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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
- F24D2101/00—Electric generators of small-scale CHP systems
- F24D2101/10—Gas turbines; Steam engines or steam turbines; Water turbines, e.g. located in water pipes
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention belongs to the technical field of energy conservation of coal-fired units, and particularly relates to an energy cascade utilization system and method applied to a condensation back-pumping heat supply unit, wherein on a high-pressure bypass, main steam is utilized to apply work in a small back-pressure steam turbine to drive a steam-driven circulating water pump to operate, so that the circulating water pump with small capacity is utilized to meet the circulating water requirement of a condenser in a standby state in a heating period, and the invention is beneficial to reducing the station service rate in the heating period; on the low-pressure bypass, reheat steam firstly enters a steam-water heat exchanger to heat boiler feed water. And the reheated steam after heat exchange enters a temperature and pressure reducer to adjust the steam temperature to the parameters required by heat users, and then is sent to a heat supply network. When the system separates the low-pressure cylinders, the corresponding low-pressure heaters are also separated at the same time, and the pressure matcher is utilized to mix high-exhaust steam and medium-exhaust steam to improve heat supply parameters, so that the separation of heat supply regulation and turbine load regulation is realized, and the safe operation of a unit is facilitated. Further improves the flexibility of the unit, is more suitable for the running condition of low-load heat supply and meets the requirement of deep peak shaving.
Description
Technical Field
The invention belongs to the technical field of energy conservation of coal-fired units, and particularly relates to an energy cascade utilization system and method applied to a condensation back-pumping heat supply unit.
Background
The cogeneration has the comprehensive benefits of saving energy, improving the environment and the like, and is an important ring for constructing an energy-saving society. With the rising of energy price and the further acceleration of town construction, the problems of insufficient heat supply capacity, insignificant energy saving effect and the like of part of cogeneration units are increasingly prominent. With the continuous increase of residential and industrial users on heat supply load demands, the power grid has higher requirements on heat supply capacity of the heat supply unit under low load rate, so that the thermoelectric ratio and flexibility of the heat supply unit must be improved, and the wide peak regulation capacity of the unit is improved to the greatest extent while the heat supply capacity of the unit is ensured. Therefore, the heat supply modification and energy saving and consumption reduction technical research on the cogeneration unit has extremely high social benefit and implementation value.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide an energy cascade utilization system and method applied to a condensation back heat supply unit, so as to solve the technical problems of realizing thermal decoupling and hot spot ratio improvement.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
in a first aspect, the present invention provides an energy cascade utilization system for a back-condensing and heat-supplying unit, comprising: the system comprises a high-pressure cylinder, a high-pressure bypass, a low-pressure bypass, a pressure matcher and a boiler reheater;
the high pressure bypass includes: a small back pressure turbine and a pneumatic circulating water pump;
the main steam pipeline is divided into two paths: one path of the main steam pipeline is connected with the steam inlet of the low back pressure turbine, the output shaft of the low back pressure turbine is connected with the steam circulating water pump, the steam outlet of the low back pressure turbine is connected with the steam inlet of the boiler reheater, the other path of the main steam pipeline is connected with the steam inlet of the high pressure cylinder, one path of the steam outlet of the high pressure cylinder is connected with the steam inlet of the boiler reheater, and the other path of the steam outlet of the high pressure cylinder is connected with one inlet of the pressure matcher;
the low pressure bypass includes: the low-pressure bypass valve, the steam-water heat exchanger, the second temperature and pressure reducer, the check valve, the second regulating valve and the stop valve;
the other path of steam outlet of the boiler reheater is connected with the steam-water heat exchanger, the low-pressure bypass valve is connected with the boiler reheater and the steam-water heat exchanger, and the steam side outlet of the steam-water heat exchanger is sequentially connected with the second temperature and pressure reducer, the check valve, the second regulating valve and the stop valve.
Further, the method further comprises the following steps: a medium pressure cylinder and a low pressure cylinder;
one steam outlet of the boiler reheater is connected with a steam inlet of the medium pressure cylinder, a first steam outlet of the medium pressure cylinder is connected with a steam inlet of the low pressure cylinder, and a second steam outlet of the medium pressure cylinder is connected with the other inlet of the pressure matcher.
Further, the method is characterized by further comprising: an automatic synchronizing clutch;
one end of the automatic synchronization clutch is connected with the high-medium pressure rotor in the medium pressure cylinder, and the other end of the automatic synchronization clutch is connected with the low-pressure rotor in the low pressure cylinder.
Further, the method further comprises the following steps: butterfly valve, first governing valve, first gate valve, second gate valve, electric gate valve, high-pressure bypass valve and first temperature-reducing pressure reducer;
the butterfly valve is connected with a first path of steam exhaust port of the medium pressure cylinder and a steam inlet port of the low pressure cylinder;
the first regulating valve is connected with the other path of steam exhaust port of the high-pressure cylinder and one inlet of the pressure matcher;
the first gate valve is connected with a second path of steam exhaust port of the medium pressure cylinder and the pressure matcher;
the second gate valve is connected with a third steam outlet of the medium pressure cylinder;
the electric gate valve and the high-pressure bypass valve are connected with a main steam pipeline and a small back pressure steam turbine;
the first temperature and pressure reducer is connected with the small back pressure turbine and the boiler reheater.
In a second aspect, the present invention provides an energy cascade utilization method applied to a back-condensing heat supply unit, based on any one of the energy cascade utilization systems applied to a back-condensing heat supply unit, including:
first working condition: when the heating period is not entered, the main steam pipeline is connected with a steam inlet of a high-pressure cylinder, one steam outlet of the high-pressure cylinder is connected with a steam inlet of a boiler reheater, one steam outlet of the boiler reheater is connected with a steam inlet of a medium-pressure cylinder, and a first steam outlet of the medium-pressure cylinder is connected with a steam inlet of a low-pressure cylinder;
the second working condition is as follows: when the heating period is entered, the automatic synchronous clutch works, so that a high-medium-pressure rotor in the medium-pressure cylinder is disconnected with a low-pressure rotor in the low-pressure cylinder; meanwhile, the butterfly valve is closed, and the steam path from the medium pressure cylinder to the low pressure cylinder is cut off.
Further, an electric gate valve is opened, a high-pressure bypass valve is opened, the high-pressure bypass starts to work, main steam enters a small back pressure turbine to do work through the high-pressure bypass, a steam feed pump in a heating period is dragged to work, and exhaust steam after doing work enters a boiler reheater to lift steam parameters after passing through a first temperature and pressure reducer; the low-pressure bypass valve, the check valve, the regulating valve and the stop valve are opened, the low-pressure bypass works, steam enters the steam-water heat exchanger from the boiler reheater through the low-pressure bypass valve to heat boiler water, and after steam parameters are regulated through the second temperature and pressure reducer, the steam is sequentially sent to the heat supply network for heat supply through the check valve, the regulating valve and the stop valve.
Further, the main steam passes through the high-pressure cylinder, the boiler reheater and the medium-pressure cylinder, the steam after acting is discharged from a third steam discharge port of the medium-pressure cylinder, the regulating valve is closed, the first gate valve is closed, the second gate valve is opened, and the medium-pressure steam is sent to a heat supply network for heat supply.
Further, when the electric load continuously drops and the steam parameters of the medium-pressure cylinder cannot meet the requirements of the heat supply network, the first regulating valve is opened, the first gate valve is opened, the second gate valve is closed, the pressure matcher starts to work, the steam exhausted by the high-pressure cylinder and the steam exhausted by the medium-pressure cylinder are mixed in the pressure matcher, and the steam parameters are improved and then sent to the heat supply network for heat supply.
Further, the first temperature-reducing pressure reducer and the second temperature-reducing pressure reducer adjust steam parameters by adding temperature-reducing water.
Further, after entering a heating period, the automatic synchronous clutch acts to enable the high-medium-pressure rotor and the low-pressure rotor to be separated, the butterfly valve is closed, and the low-pressure rotor stops running; the butterfly valve is closed and steam no longer enters the low pressure cylinder.
The invention has at least the following beneficial effects:
1. the invention provides an energy cascade utilization system applied to a condensation back-pumping heat supply unit, which comprises the following components: the system comprises a high-pressure cylinder, a high-pressure bypass, a low-pressure bypass, a pressure matcher and a boiler reheater; the high pressure bypass includes: a small back pressure turbine and a pneumatic circulating water pump; the main steam pipeline is divided into two paths: one path is connected with the steam inlet of the small back pressure steam turbineThe output shaft of the small back pressure turbine is connected with the steam circulating water pump, the steam outlet of the small back pressure turbine is connected with the steam inlet of the boiler reheater, the other path of the main steam pipeline is connected with the steam inlet of the high pressure cylinder, one path of steam outlet of the high pressure cylinder is connected with the steam inlet of the boiler reheater, and the other path of steam outlet of the high pressure cylinder is connected with one inlet of the pressure matcher; the low pressure bypass includes: the low-pressure bypass valve, the steam-water heat exchanger, the second temperature and pressure reducer, the check valve, the second regulating valve and the stop valve; the other path of steam outlet of the boiler reheater is connected with the steam-water heat exchanger, the low-pressure bypass valve is connected with the boiler reheater and the steam-water heat exchanger, and the steam side outlet of the steam-water heat exchanger is sequentially connected with the second temperature and pressure reducer, the check valve, the second regulating valve and the stop valve. On the high-pressure bypass, the main steam is utilized to apply work in the small back pressure steam turbine to drive the steam-driven circulating water pump to operate, so that the circulating water demand of the condenser in the standby state in the heating period is met by utilizing the small-capacity circulating water pump, and the power consumption of the plant in the heating period is reduced. The main steam exhaust steam after acting enters the temperature and pressure reducing device again to adjust steam parameters, thereby reducing the required temperature and water reducing amount and reducingDamage; on the low-pressure bypass, reheat steam firstly enters a steam-water heat exchanger to heat boiler feed water. And the reheated steam after heat exchange enters a temperature and pressure reducer to adjust steam parameters to parameters required by heat users, and then is sent to a heat supply network. On one hand, when the system separates the low-pressure cylinders, the corresponding low-pressure heaters are separated at the same time, and the steam-water heat exchanger is utilized to effectively utilize reheat steam to raise the water supply temperature of the boiler, so that the water supply temperature which is too low and is caused by the lack of the low-pressure heaters is counteracted; on the other hand, the reheat steam enters the temperature and pressure reducing device after heat exchange, thereby reducing the required temperature and water reducing amount and reducing +.>Damage.
2. The invention provides an energy cascade utilization method applied to a condensation back-pumping heat supply unit, which comprises the following steps: first working condition: when the heating period is not entered, the main steam pipeline is connected with a steam inlet of a high-pressure cylinder, one steam outlet of the high-pressure cylinder is connected with a steam inlet of a boiler reheater, one steam outlet of the boiler reheater is connected with a steam inlet of a medium-pressure cylinder, and a first steam outlet of the medium-pressure cylinder is connected with a steam inlet of a low-pressure cylinder; the second working condition is as follows: when the heating period is entered, the automatic synchronous clutch works, so that a high-medium-pressure rotor in the medium-pressure cylinder is disconnected with a low-pressure rotor in the low-pressure cylinder; meanwhile, the butterfly valve is closed, and the steam path from the medium pressure cylinder to the low pressure cylinder is cut off. In the heating period, main steam passes through the high-pressure cylinder, the boiler reheater and the medium-pressure cylinder, the steam after acting is discharged from a third steam discharge port of the medium-pressure cylinder, the regulating valve is closed, the first gate valve is closed, the second gate valve is opened, and the medium-pressure steam is sent to a heating network for heating. When the unit runs under low load, the condition that the medium-exhaust steam cannot meet the heat supply requirement possibly exists, and the heat supply parameters are improved by mixing the high-exhaust steam and the medium-exhaust steam by utilizing the pressure matcher. The heat supply regulation and the turbine load regulation are separated, and the safe operation of the unit is facilitated. The flexibility of the unit is further improved, the unit is more suitable for the running condition of low-load heat supply and meets the requirement of deep peak shaving.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:
FIG. 1 is a system diagram of an energy cascade utilization system for a back-condensing heat supply unit according to the present invention;
wherein: 1. a high-pressure cylinder; 2. a medium pressure cylinder; 3. an automatic synchronizing clutch; 4. a low pressure cylinder; 5. butterfly valve; 6. a first regulating valve; 7. a pressure matcher; 8. a first gate valve; 9. a second gate valve; 10. an electric gate valve; 11. a high pressure bypass valve; 12. a small back pressure turbine; 13. a pneumatic circulating water pump; 14. a first temperature and pressure reducer; 15. a boiler reheater; 16. a low pressure bypass valve; 17. a steam-water heat exchanger; 18. a second temperature and pressure reducer; 19. a non-return valve; 20. a second regulating valve; 21. and a stop valve.
Detailed Description
The invention will be described in detail below with reference to the drawings in connection with embodiments. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
The following detailed description is exemplary and is intended to provide further details of the invention. Unless defined otherwise, all technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention.
Example 1
Referring to fig. 1, the invention provides an energy cascade utilization system applied to a condensation back-pumping heat supply unit, which comprises a high pressure cylinder 1, a medium pressure cylinder 2, an automatic synchronization clutch 3, a low pressure cylinder 4, a butterfly valve 5, a first regulating valve 6, a pressure matcher 7, a first gate valve 8, a second gate valve 9, an electric gate valve 10, a high-pressure bypass valve 11, a small back pressure turbine 12, a steam-driven circulating water pump 13, a first temperature-reducing pressure reducer 14, a boiler reheater 15, a low-pressure bypass valve 16, a steam-water heat exchanger 17, a second temperature-reducing pressure reducer 18, a check valve 19, a second regulating valve 20 and a stop valve 21. The high-pressure bypass is that a main steam path is connected with a steam inlet of a small back pressure turbine 12 through an electric gate valve 10 and a high-pressure bypass valve 11, an output shaft of the small back pressure turbine 12 is connected with a steam circulating water pump 13 to drive the steam circulating water pump 13 to operate, a steam outlet of the small back pressure turbine 12 is connected with an inlet of a first temperature-reduction pressure reducer 14, an outlet of the first temperature-reduction pressure reducer 14 and one steam outlet of a high-pressure cylinder 1 are connected with a boiler reheater 15, the boiler reheater 15 is connected with an inlet of a steam-water heat exchanger 17 through a low-pressure bypass valve 16, an outlet of the steam-water heat exchanger 17 is connected with an inlet of a second temperature-reduction pressure reducer 18, and an outlet of the second temperature-reduction pressure reducer 18 is sequentially connected with a check valve 19, a second regulating valve 20 and a stop valve 21 to supply heat to a heat supply network. One path of steam exhaust port of the high-pressure cylinder 1 is connected with one path of steam inlet of the medium-pressure cylinder 2 through a boiler reheater 15, and the other path is connected with one inlet of the pressure matcher 7 through a first regulating valve 6. One end of the automatic synchronizing clutch 3 is connected with a high-medium pressure rotor in the medium pressure cylinder 2, and the other end of the automatic synchronizing clutch 3 is connected with a low-pressure rotor in the low pressure cylinder 4. The first path of the steam outlet of the medium pressure cylinder 2 is connected with one side of a butterfly valve 5, the other side of the butterfly valve 5 is connected with the steam inlet of the low pressure cylinder 4, the second path of the steam outlet of the medium pressure cylinder 2 is connected with the inlet of a pressure matcher 7 through a first gate valve 8, after steam is mixed, heat is supplied to a heat supply network, and the third path of the steam outlet of the medium pressure cylinder 2 is used for supplying heat to the heat supply network through a second gate valve 9.
Example 2
The invention provides an energy cascade utilization method applied to a condensation back-pumping heat supply unit, which is characterized in that after a heating period is entered, an automatic synchronous clutch 3 operates to disconnect a high-medium-pressure rotor from a low-pressure rotor according to requirements, a butterfly valve 5 is closed, and the low-pressure rotor stops operating. The main steam passes through the high-pressure cylinder 1, the boiler reheater 15 and the medium-pressure cylinder 2, the steam after acting is discharged from a third steam outlet of the medium-pressure cylinder 2, at the moment, the regulating valve 6 is closed, the first gate valve 8 is closed, the second gate valve 9 is opened, and the medium-pressure steam is sent to a heat supply network for heat supply. A high pressure bypass and a low pressure bypass are provided on both sides of the boiler reheater 15, respectively. The high-pressure bypass is that main steam enters a small back pressure turbine 12 to expand and do work through an electric gate valve 10 and a high-pressure bypass valve 11 to drive a small-capacity steam-driven circulating water pump 13 running in a heat supply period to run, and exhaust steam after doing work enters a first temperature and pressure reducer 14 to adjust steam parameters, so that the parameters are consistent with the steam discharge parameters of the high-pressure cylinder 1, and the parameters enter a boiler reheater 15 together. The low-pressure bypass is that hot steam from the outlet of the boiler reheater 15 enters the steam-water heat exchanger 17 to heat boiler water supply through the low-pressure bypass valve 16, then enters the second temperature-reduction pressure reducer 18 to adjust steam parameters, reaches the demand of a heat user, and then is sent to a heat supply network to supply heat through the check valve 19, the second regulating valve 20 and the stop valve 21 in sequence. When the electric load continuously drops and the medium-pressure steam discharging parameter can not meet the requirement of a heat supply network, the first regulating valve 6 is opened, the first gate valve 8 is opened, the second gate valve 9 is closed, the pressure matcher 7 starts to work, and the steam discharging of the high-pressure cylinder 1 and the steam discharging of the medium-pressure cylinder 2 are mixed to lift the steam parameters and then are sent to the heat supply network for heat supply.
It will be appreciated by those skilled in the art that the present invention can be carried out in other embodiments without departing from the spirit or essential characteristics thereof. Accordingly, the above disclosed embodiments are illustrative in all respects, and not exclusive. All changes that come within the scope of the invention or equivalents thereto are intended to be embraced therein.
Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the invention without departing from the spirit and scope of the invention, which is intended to be covered by the claims.
Claims (10)
1. An energy cascade utilization system for congeal and take out back heating unit, characterized by comprising: a high-pressure cylinder (1), a high-pressure bypass, a low-pressure bypass, a pressure matcher (7) and a boiler reheater (15);
the high pressure bypass includes: a small back pressure turbine (12) and a pneumatic circulating water pump (13);
the main steam pipeline is divided into two paths: one path of the main steam pipeline is connected with a steam inlet of a small back pressure turbine (12), an output shaft of the small back pressure turbine (12) is connected with a steam circulating water pump (13), a steam outlet of the small back pressure turbine (12) is connected with a steam inlet of a boiler reheater (15), the other path of the main steam pipeline is connected with a steam inlet of a high pressure cylinder (1), one path of the steam outlet of the high pressure cylinder (1) is connected with a steam inlet of the boiler reheater (15), and the other path of the steam outlet of the high pressure cylinder (1) is connected with one inlet of a pressure matcher (7);
the low pressure bypass includes: a low-pressure bypass valve (16), a steam-water heat exchanger (17), a second temperature and pressure reducer (18), a check valve (19), a second regulating valve (20) and a stop valve (21);
the other path of steam outlet of the boiler reheater (15) is connected with a steam-water heat exchanger (17), the low-pressure bypass valve (16) is connected with the boiler reheater (15) and the steam-water heat exchanger (17), and a steam side outlet of the steam-water heat exchanger (17) is sequentially connected with a second temperature and pressure reducer (18), a check valve (19), a second regulating valve (20) and a stop valve (21).
2. An energy cascade utilization system for a back-condensing heat supply unit according to claim 1, further comprising: a medium pressure cylinder (2) and a low pressure cylinder (4);
one steam outlet of the boiler reheater (15) is connected with a steam inlet of the medium pressure cylinder (2), a first steam outlet of the medium pressure cylinder (2) is connected with a steam inlet of the low pressure cylinder (4), and a second steam outlet of the medium pressure cylinder (2) is connected with the other inlet of the pressure matcher (7).
3. An energy cascade utilization system for a back-condensing heat supply unit according to claim 2, further comprising: an automatic synchronizing clutch (3);
one end of the automatic synchronization clutch (3) is connected with a high-medium-pressure rotor in the medium-pressure cylinder (2), and the other end of the automatic synchronization clutch (3) is connected with a low-pressure rotor in the low-pressure cylinder (4).
4. An energy cascade utilization system for a back-condensing heat supply unit according to claim 3, further comprising: the device comprises a butterfly valve (5), a first regulating valve (6), a first gate valve (8), a second gate valve (9), an electric gate valve (10), a high-pressure bypass valve (11) and a first temperature and pressure reducer (14);
the butterfly valve (5) is connected with a first path of steam outlet of the medium pressure cylinder (2) and a steam inlet of the low pressure cylinder (4);
the first regulating valve (6) is connected with the other path of steam exhaust port of the high-pressure cylinder (1) and one inlet of the pressure matcher (7);
the first gate valve (8) is connected with a second path of steam exhaust port of the medium pressure cylinder (2) and the other inlet of the pressure matcher (7);
the second gate valve (9) is connected with a third steam outlet of the medium pressure cylinder (2);
the electric gate valve (10) and the high-pressure bypass valve (11) are connected with a main steam pipeline and the small back pressure steam turbine (12);
the first temperature and pressure reducer (14) is connected with the small back pressure turbine (12) and the boiler reheater (15).
5. An energy cascade utilization method applied to a back-condensing heat supply unit, characterized in that an energy cascade utilization system applied to a back-condensing heat supply unit according to any one of claims 1 to 4 comprises:
first working condition: when the heating period is not entered, the main steam pipeline is connected with a steam inlet of the high-pressure cylinder (1), one steam outlet of the high-pressure cylinder (1) is connected with a steam inlet of the boiler reheater (15), one steam outlet of the boiler reheater (15) is connected with a steam inlet of the medium-pressure cylinder (2), and a first steam outlet of the medium-pressure cylinder (2) is connected with a steam inlet of the low-pressure cylinder (4);
the second working condition is as follows: when the heating period is entered, the automatic synchronous clutch (3) works, so that a high-medium-pressure rotor in the medium-pressure cylinder (2) is disconnected with a low-pressure rotor in the low-pressure cylinder (4); meanwhile, the butterfly valve (5) is closed, and the steam path from the medium pressure cylinder (2) to the low pressure cylinder (4) is cut off.
6. The energy cascade utilization method applied to the condensation back heat supply unit according to claim 5 is characterized in that an electric gate valve (10) is opened, a high-pressure bypass valve (11) is opened, a high-pressure bypass starts to work, main steam enters a small back pressure turbine (12) to do work through the high-pressure bypass, a steam feed pump (13) in a heat supply period is dragged to work, and exhaust steam after doing work enters a boiler reheater (15) to lift steam parameters after passing through a first temperature and pressure reducer (14); the low-pressure bypass valve (16), the check valve (19), the second regulating valve (20) and the stop valve (21) are opened, the low-pressure bypass works, steam enters the steam-water heat exchanger (17) from the boiler reheater (15) through the low-pressure bypass valve (16), and after the steam parameters are regulated through the second temperature and pressure reducer (18), the steam is sequentially sent to the heat supply network through the check valve (19), the second regulating valve (20) and the stop valve (21).
7. The energy cascade utilization method applied to the condensation back heat supply unit according to claim 5, wherein main steam passes through the high-pressure cylinder (1), the boiler reheater (15) and the medium-pressure cylinder (2), the steam after working is discharged from a third steam discharge port of the medium-pressure cylinder (2), the first regulating valve (6) is closed, the first gate valve (8) is closed, the second gate valve (9) is opened, and the medium-pressure steam is sent to a heat supply network for heat supply.
8. The energy cascade utilization method applied to the condensation back heat supply unit according to claim 5 is characterized in that when electric load continuously decreases and a medium-exhaust steam parameter cannot meet a heat supply network requirement, a first regulating valve (6) is opened, a first gate valve (8) is opened, a second gate valve (9) is closed, a pressure matcher (7) starts to work, high-pressure cylinder (1) exhaust steam and medium-pressure cylinder (2) exhaust steam are mixed in the pressure matcher (7), and the steam parameter is lifted and then sent to the heat supply network for heat supply.
9. The energy cascade utilization method applied to a back-condensing heat supply unit according to claim 6, characterized in that the first temperature-reducing pressure reducer (14) and the second temperature-reducing pressure reducer (18) adjust steam parameters by adding temperature-reducing water.
10. The energy cascade utilization method applied to the condensation back heat supply unit according to claim 5, wherein after entering a heating period, the automatic synchronization clutch (3) acts to disengage a high-medium-pressure rotor of the medium-pressure cylinder (2) from a low-pressure rotor of the low-pressure cylinder (4), and the low-pressure rotor stops running; the butterfly valve (5) is closed and steam no longer enters the low pressure cylinder (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310799076.4A CN116877973A (en) | 2023-06-30 | 2023-06-30 | Energy cascade utilization system and method applied to condensation back-pumping heat supply unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310799076.4A CN116877973A (en) | 2023-06-30 | 2023-06-30 | Energy cascade utilization system and method applied to condensation back-pumping heat supply unit |
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| CN116877973A true CN116877973A (en) | 2023-10-13 |
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| CN118273780A (en) * | 2024-06-04 | 2024-07-02 | 浙江大学 | Exhaust steam adjusting method and system for back extraction steam turbine |
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