CN115126563A - Frequency modulation system with heat pump and steam ejector and working method - Google Patents
Frequency modulation system with heat pump and steam ejector and working method Download PDFInfo
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- CN115126563A CN115126563A CN202210963386.0A CN202210963386A CN115126563A CN 115126563 A CN115126563 A CN 115126563A CN 202210963386 A CN202210963386 A CN 202210963386A CN 115126563 A CN115126563 A CN 115126563A
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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
- 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
- F01K17/04—Using steam or condensate extracted or exhausted from steam engine plant for specific purposes other than heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
- F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
- F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
- F04F5/16—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing elastic fluids
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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
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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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
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
- F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Water Supply & Treatment (AREA)
- Fluid Mechanics (AREA)
- Jet Pumps And Other Pumps (AREA)
Abstract
The invention provides a frequency modulation system with a heat pump and a steam ejector and a working method, belonging to the technical field of frequency modulation of generator sets and comprising the following steps: the steam extraction and storage tank is used for storing the extracted steam of the medium and low pressure cylinder of the steam turbine; the heat pump system is provided with a heat absorption heat exchanger and a heat release heat exchanger, the heat absorption heat exchanger performs heat absorption and heat exchange through steam in the steam extraction and storage tank, and the heat release heat exchanger heats the water supply in the bypass pipeline; an outlet of the steam ejector is communicated with a steam heat exchanger, and the steam heat exchanger is used for heating the feed water in the bypass pipeline; according to the frequency modulation system provided with the heat pump and the steam ejector, when the unit is subjected to load increase, the feed water to the boiler is increased through the bypass pipeline, and meanwhile, the bypass feed water is heated through the heat release heat exchanger of the heat pump system and the steam heat exchanger communicated with the steam ejector, so that the temperature fluctuation caused by the increase of the feed water quantity of the boiler is reduced, and the stable operation of the boiler is ensured.
Description
Technical Field
The invention relates to the technical field of frequency modulation of generator sets, in particular to a frequency modulation system with a heat pump and a steam ejector and a working method.
Background
With the large-scale grid connection of new energy, the new energy power generation proportion is higher and higher. However, because the energy supply of the new energy source changes greatly with time, the daily capacity condition of the new energy source cannot be effectively predicted, so that the frequency of the power grid side fluctuates, and the power supply quality of the power grid is affected.
The power grid puts corresponding requirements on the regulation rate and the regulation precision of the power plant participating in the primary and secondary frequency modulation. However, because the boiler side has a long response time to the load, and because the steam flow rate is high, the energy storage capacity in the steam turbine is limited. Therefore, there are disadvantages in both the adjustment rate and the adjustment accuracy.
At present, frequency modulation means such as ultrahigh pressure valve throttling, condensed water throttling, high pressure feed water bypass and the like are mainly adopted. However, the condition of main steam throttling exists in ultrahigh pressure valve throttling, energy loss is large, and the capacity of a condensed water throttling mode participating in frequency modulation is high, and the effect of a water feeding bypass is weak. The high-feed water bypass frequency modulation mode easily causes the feed water temperature fluctuation of the boiler and influences the stable operation of the boiler.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect that the boiler feed water temperature fluctuation is easily caused by a high feed water bypass frequency modulation mode in the prior art, and the stable operation of the boiler is influenced, thereby providing the frequency modulation system with the heat pump and the steam ejector and the working method thereof.
In order to solve the above technical problem, the present invention provides a frequency modulation system configured with a heat pump and a steam ejector, including:
the steam extraction and storage tank is communicated with the medium-low pressure cylinder of the steam turbine and is used for storing steam extraction of the medium-low pressure cylinder of the steam turbine;
the heat pump system is provided with a heat absorption heat exchanger and a heat release heat exchanger, the heat absorption heat exchanger is communicated with the steam extraction and storage tank, the heat absorption heat exchanger performs heat absorption and heat exchange through steam in the steam extraction and storage tank, the heat release heat exchanger is arranged on a bypass pipeline from an outlet of a deaerator to a boiler water supply inlet, and water supply in the bypass pipeline is heated through the heat release heat exchanger;
the steam ejector is communicated with the steam extraction and storage tank, an outlet of the steam ejector is communicated with the steam heat exchanger, the steam heat exchanger is arranged on a bypass pipeline from an outlet of the deaerator to a water inlet of the boiler, and the steam heat exchanger heats the water supply in the bypass pipeline.
Optionally, the steam extraction and steam storage tank comprises a high-pressure steam storage tank and a low-pressure steam storage tank, the low-pressure steam storage tank extracts steam from the low-pressure end of the medium-low pressure cylinder, and the high-pressure steam storage tank extracts steam from the high-pressure end of the medium-low pressure cylinder;
an outlet of the low-pressure steam storage tank is communicated with a heat absorption heat exchanger of the heat pump system and a low-pressure port of the steam ejector;
and an outlet of the high-pressure steam storage tank is communicated with a high-pressure port of the steam ejector.
Optionally, the outlet of the low pressure steam storage tank and the outlet of the high pressure steam storage tank both finally lead to a deaerator.
Optionally, the heat-rejecting heat exchanger of the heat pump system comprises: the heat exchanger comprises a first heat-releasing heat exchanger and a second heat-releasing heat exchanger, wherein the first heat-releasing heat exchanger is arranged at the upstream of a steam heat exchanger communicated with the steam ejector, the second heat-releasing heat exchanger is arranged at the downstream of the steam heat exchanger, the heat exchange temperature of the first heat-releasing heat exchanger is lower than that of the steam heat exchanger, and the heat exchange temperature of the second heat-releasing heat exchanger is higher than that of the steam heat exchanger.
Optionally, a solution heat exchanger is arranged between the reciprocating circulation pipelines of the heat absorption heat exchanger and the first heat release heat exchanger.
Optionally, the method further comprises: the steam inlet of the small steam turbine draws steam from the outlet of the high-pressure cylinder of the steam turbine, the steam outlet of the small steam turbine is communicated to the condenser, the small steam turbine is connected with a water feeding pump on a main pipeline from the outlet of the deaerator to a boiler water feeding inlet, and the small steam turbine drives the water feeding pump to rotate.
Optionally, a high-pressure regenerative heater is arranged at the downstream of the water feed pump, a steam extraction side of the high-pressure regenerative heater is communicated with a steam extraction port of a high-pressure cylinder of the steam turbine, and the steam extraction flow of the high-pressure regenerative heater is changed by changing the water feed flow of the high-pressure regenerative heater in a short time.
The invention provides a working method of a frequency modulation system provided with a heat pump and a steam ejector, which comprises the following steps:
when the unit is in load increase, the water supply flow in a main pipeline from the outlet of the deaerator to the water supply inlet of the boiler is reduced, and the water supply flow in a bypass pipeline from the outlet of the deaerator to the water supply inlet of the boiler is increased; meanwhile, the water supply in the bypass pipeline is heated in a multi-stage mode through a heat release heat exchanger in the heat pump system and a steam heat exchanger communicated with an outlet of the steam ejector.
Optionally, when the load of the unit is reduced, the steam extraction amount of the small steam turbine is increased, so that the rotating speed of a water feeding pump on a main water feeding pipeline is increased, and the heat exchange temperature rise of the tube side of the high-pressure regenerative heater is reduced, so that the temperature of the outlet of the tube side of the high-pressure regenerative heater is reduced, the pressure of the shell side of the high-pressure regenerative heater is reduced, the pressure difference between the upper side and the lower side of the steam extraction pipeline is increased, the water feeding flow speed in the high-pressure regenerative heater is increased, the steam extraction flow of the high-pressure regenerative heater from a high-pressure cylinder is further increased, and the power generation of the unit is reduced;
simultaneously, the feed water flow in the bypass pipeline from the deaerator outlet to the boiler feed water inlet is reduced.
Optionally, when the unit normally operates or reduces the load, the steam inlet valve of the steam extraction and storage tank is opened, steam is extracted from the medium-low pressure cylinder of the steam turbine, and after the steam is fully stored, the steam inlet valve of the steam extraction and storage tank is closed.
The technical scheme of the invention has the following advantages:
1. according to the frequency modulation system provided with the heat pump and the steam ejector, when the unit is subjected to load increase, the feed water to the boiler is increased through the bypass pipeline, and meanwhile, the bypass feed water is heated through the heat release heat exchanger of the heat pump system and the steam heat exchanger communicated with the steam ejector, so that temperature fluctuation caused by the fact that the feed water quantity of the boiler is increased is reduced, and stable operation of the boiler is guaranteed.
2. The frequency modulation system provided with the heat pump and the steam ejector is also provided with the small steam turbine, the small steam turbine is driven by the extraction of steam through the high-pressure cylinder, and the rotation of the small steam turbine can drive the water supply in the main water supply pipeline of the boiler to flow, so that when the rotation speed of the small steam turbine is increased, the water supply flow in the main water supply pipeline leading to the boiler can be increased, the extraction amount of the high-pressure cylinder in the high-pressure regenerative heater is further driven, and the work of the steam turbine is reduced.
3. According to the working method of the frequency modulation system provided with the heat pump and the steam ejector, the frequency modulation system provided with the heat pump and the steam ejector is adopted, so that the working method has the advantages of any one of the above.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a front view of one embodiment of a frequency modulation system incorporating a heat pump and a vapor eductor provided in an embodiment of the present invention.
Description of reference numerals:
1. a boiler; 2. a high pressure cylinder; 3. a medium-low pressure cylinder; 4. a condenser; 5. a small steam turbine; 6. a feed pump; 7. a high pressure regenerative heater; 8. a deaerator; 9. a low pressure vapor storage tank; 10. a high pressure vapor storage tank; 11. a heat absorption heat exchanger; 12. a first heat rejection heat exchanger; 13. a second heat rejection heat exchanger; 14. a solution heat exchanger; 15. a steam heat exchanger; 16. a steam ejector.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The frequency modulation system provided with the heat pump and the steam ejector can be used for peak and valley regulation of a thermal power plant.
As shown in fig. 1, a specific implementation of the frequency modulation system configured with a heat pump and a steam ejector provided in this embodiment includes: the steam extraction and storage tank, the heat pump system and the steam ejector 16 are communicated with the medium and low pressure cylinder 3 of the steam turbine, and are used for extracting and storing steam from the medium and low pressure cylinder 3 of the steam turbine when the load is reduced or the normal operation is not influenced. The heat pump system has heat absorption heat exchanger 11 and exothermic heat exchanger, heat absorption heat exchanger 11 with draw vapour steam storage jar intercommunication, heat absorption heat exchanger 11 passes through steam in the steam extraction steam storage jar carries out the heat absorption heat transfer, exothermic heat exchanger sets up on the bypass pipeline from 8 exports of oxygen-eliminating device to 1 water supply intakes of boiler, through exothermic heat exchanger is right feedwater in the bypass pipeline heats. The steam ejector 16 is communicated with the steam extraction and storage tank, an outlet of the steam ejector 16 is communicated with a steam heat exchanger, the steam heat exchanger is arranged on a bypass pipeline from an outlet of the deaerator 8 to a water supply inlet of the boiler 1, and the steam heat exchanger heats water supply in the bypass pipeline.
The frequency modulation system of configuration heat pump and steam ejector that this embodiment provided, when the unit is carried high load, increases the feedwater to boiler 1 through the bypass pipeline, and the steam heat exchanger that simultaneously passes through heat pump system's exothermic heat exchanger and communicate with steam ejector 16 heaies up the bypass feedwater to reduce the temperature fluctuation that brings the feedwater volume of improving to boiler 1, guarantee boiler 1 steady operation.
As shown in fig. 1, in the frequency modulation system configured with a heat pump and a steam ejector provided in this embodiment, the steam extraction and storage tank includes: the high-pressure steam storage tank 10 and the low-pressure steam storage tank 9, the low-pressure steam storage tank 9 extracts steam from the low-pressure end of the medium and low pressure cylinder 3, and the high-pressure steam storage tank 10 extracts steam from the high-pressure end of the medium and low pressure cylinder 3. The outlet of the low-pressure steam storage tank 9 leads to the heat absorption heat exchanger 11 of the heat pump system and to the low-pressure port of the steam ejector 16, that is, steam is supplied through the low-pressure steam storage tank 9 toward the heat absorption heat exchanger 11 of the heat pump system and toward the low-pressure port of the steam ejector 16, respectively. The outlet of the high-pressure steam storage tank 10 leads to the high-pressure port of the steam ejector 16, that is, the high-pressure steam storage tank 10 is used for supplying steam towards the high-pressure port of the steam ejector 16, and in the steam ejector 16, the steam supplied in the high-pressure steam storage tank 10 and the low-pressure steam storage tank 9 are mixed, so that a proper heating temperature is provided for bypass water supply.
As shown in fig. 1, the outlet of the low-pressure steam storage tank 9 and the outlet of the high-pressure steam storage tank 10 are both finally led to the deaerator 8, so that steam is extracted from the medium-low pressure cylinder 3 of the steam turbine for circulation, and the loss of circulating water is avoided.
As shown in fig. 1, in the frequency modulation system configured with a heat pump and a steam ejector according to the embodiment, a heat releasing heat exchanger of the heat pump system includes: a first heat-releasing heat exchanger 12, which may be specifically an absorber heat-releasing device, disposed upstream of the steam heat exchanger communicating with the steam ejector 16, and a second heat-releasing heat exchanger 13, which may be specifically a condenser heat-releasing device, disposed downstream of the steam heat exchanger. The heat exchange temperature of the first heat-releasing heat exchanger 12 is lower than that of the steam heat exchanger 15, and the heat exchange temperature of the second heat-releasing heat exchanger 13 is higher than that of the steam heat exchanger 15. The bypass water supply is heated step by step through the first heat-releasing heat exchanger 12, the steam heat exchanger 15 and the second heat-releasing heat exchanger 13, so that heat is utilized more reasonably, and excessive heat loss is avoided. In operation, a first cycle is formed between the first heat-releasing heat exchanger 12 and the heat-absorbing heat exchanger 11, so that the heat in the heat-absorbing heat exchanger 11 is used for heating the first heat-releasing heat exchanger 12; a second cycle is formed between the second heat-releasing heat exchanger 13 and the heat-absorbing heat exchanger 11, so that the second heat-releasing heat exchanger 13 is heated by the heat in the heat-absorbing heat exchanger 11.
As shown in fig. 1, a solution heat exchanger 14 is disposed between the heat absorption heat exchanger 11 and the reciprocating circulation pipeline of the first heat release heat exchanger 12, so that the inlet water and the return water of the first heat release heat exchanger 12 exchange heat through the solution heat exchanger 14 to reduce the heat exchange temperature in the first heat release heat exchanger 12, thereby realizing gradual temperature rise of the bypass feed water.
As shown in fig. 1, the frequency modulation system configured with a heat pump and a steam ejector according to this embodiment further includes: the steam turbine 5, the steam extraction is gone out from the afterbody export of the high pressure jar 2 of steam turbine to the admission of little steam turbine 5, and the play steam of little steam turbine 5 accesss to condenser 4, little steam turbine 5 is connected with the water-feeding pump 6 on the trunk line from 8 exports of oxygen-eliminating device to boiler 1 feedwater import, through little steam turbine 5 drives water-feeding pump 6 rotates. That is, when the small steam turbine 5 extracts steam from the rear outlet of the high pressure cylinder 2 more, the speed at which the feed water pump 6 is driven to rotate can be increased, thereby increasing the flow rate of feed water from the main feed water pipe to the boiler 1. Alternatively, the small turbine 5 may be omitted and the feed water flow in the main feed water pipe may be increased by other conventional means.
As shown in fig. 1, in the frequency modulation system configured with a heat pump and a steam ejector according to this embodiment, a high-pressure regenerative heater 7 is disposed downstream of the water feed pump 6, a steam extraction side of the high-pressure regenerative heater 7 is communicated with a steam extraction of the high-pressure cylinder 2 of the steam turbine, and a steam extraction flow of the high-pressure regenerative heater 7 is changed by changing a water feed flow of the high-pressure regenerative heater 7 in a short time. When the load of the unit is reduced, the flow rate of the water supply in the high-pressure regenerative heater 7 can be increased, so that the steam extraction flow of the high-pressure cylinder 2 is increased, and the work-doing power generation of the high-pressure cylinder 2 is reduced.
The embodiment also provides a working method of the frequency modulation system with the heat pump and the steam ejector, which comprises the following steps:
when the unit is loaded, reduce 8 exports the interior feedwater flow of trunk line to 1 feedwater import of boiler of oxygen-eliminating device, increase 8 exports the bypass pipeline interior feedwater flow of 1 feedwater import of boiler to the oxygen-eliminating device, and the steam heat exchanger through the export intercommunication of the heat exchanger that releases in the heat pump system and steam ejector 16 carries out multistage heating to the feedwater in the bypass pipeline. Therefore, by raising the temperature of the bypass feed water, the energy consumed for raising the temperature of the feed water to the boiler 1 is reduced, and the steam extraction of the high pressure cylinder 2 consumed for raising the temperature of the feed water in the main feed water pipeline is reduced, thereby improving the work of the high pressure cylinder 2.
When the unit is unloaded, improve the feedwater flow in boiler 1's the main water supply pipe, it is specific: the extraction steam volume of the small steam turbine 5 is increased, so that the rotating speed of a water feeding pump 6 on a main water feeding pipeline is increased, the heat exchange temperature rise of the tube side of the high-pressure regenerative heater 7 is reduced, the temperature of the outlet of the tube side of the high-pressure regenerative heater 7 is reduced, the pressure of the shell side of the high-pressure regenerative heater 7 is reduced, the pressure difference of the upper side and the lower side of the extraction steam pipeline is increased, the water feeding flow rate in the high-pressure regenerative heater 7 is increased, the extraction steam flow of the high-pressure regenerative heater 7 from the high-pressure cylinder 2 is further increased, and the power generation of a unit is reduced; at the same time, the feed water flow in the bypass line from the outlet of the deaerator 8 to the feed water inlet of the boiler 1 is reduced.
In addition, when the unit normally operates or reduces the load, the steam inlet valve of the steam extraction and storage tank is opened, steam is extracted from the medium and low pressure cylinder 3 of the steam turbine, and after the steam is fully stored, the steam inlet valve of the steam extraction and storage tank is closed, so that the energy storage for heating the bypass main water supply pipeline is completed.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.
Claims (10)
1. The utility model provides a configuration heat pump and steam ejector's frequency modulation system which characterized in that includes:
the steam extraction and storage tank is communicated with the medium and low pressure cylinder (3) of the steam turbine and is used for storing steam extracted by the medium and low pressure cylinder (3) of the steam turbine;
the heat pump system is provided with a heat absorption heat exchanger (11) and a heat release heat exchanger, the heat absorption heat exchanger (11) is communicated with the steam extraction and storage tank, the heat absorption heat exchanger (11) performs heat absorption and heat exchange through steam in the steam extraction and storage tank, the heat release heat exchanger is arranged on a bypass pipeline from an outlet of a deaerator (8) to a water supply inlet of the boiler (1), and water supply in the bypass pipeline is heated through the heat release heat exchanger;
the steam ejector (16) is communicated with the steam extraction and storage tank, an outlet of the steam ejector (16) is communicated with the steam heat exchanger, the steam heat exchanger is arranged on a bypass pipeline from an outlet of the deaerator (8) to a water supply inlet of the boiler (1), and the water supply in the bypass pipeline is heated through the steam heat exchanger.
2. The system for modulating frequency of a configuration heat pump and steam ejector according to claim 1, wherein the steam extraction and storage tank comprises a high pressure steam storage tank (10) and a low pressure steam storage tank (9), the low pressure steam storage tank (9) extracts steam from the low pressure side of the medium and low pressure cylinder (3), and the high pressure steam storage tank (10) extracts steam from the high pressure side of the medium and low pressure cylinder (3);
the outlet of the low-pressure steam storage tank (9) is communicated with a heat absorption heat exchanger (11) of the heat pump system, and is communicated with a low-pressure port of the steam ejector (16);
the outlet of the high-pressure steam storage tank (10) is communicated with the high-pressure port of the steam ejector (16).
3. Frequency-modulation system equipped heat pump and steam ejector according to claim 2, characterized in that the outlet of the low-pressure steam storage tank (9) and the outlet of the high-pressure steam storage tank (10) both finally lead to a deaerator (8).
4. A fm system incorporating a heat pump and a vapor eductor as claimed in claim 1, wherein the heat rejection heat exchanger of the heat pump system comprises: a first heat-releasing heat exchanger (12) and a second heat-releasing heat exchanger (13), wherein the first heat-releasing heat exchanger (12) is arranged at the upstream of a steam heat exchanger communicated with the steam ejector (16), the second heat-releasing heat exchanger (13) is arranged at the downstream of the steam heat exchanger, the heat exchange temperature of the first heat-releasing heat exchanger (12) is lower than that of the steam heat exchanger (15), and the heat exchange temperature of the second heat-releasing heat exchanger (13) is higher than that of the steam heat exchanger (15).
5. FM system with heat pump and steam ejector configuration according to claim 4, characterized in that a solution heat exchanger (14) is provided between the reciprocating circuit of the heat absorption heat exchanger (11) and the first heat release heat exchanger (12).
6. A FM system configured with a heat pump and a steam injector as claimed in any one of claims 1 to 5 further comprising: little steam turbine (5), the admission of little steam turbine (5) exports the extraction from high-pressure cylinder (2) of steam turbine, and the play steam of little steam turbine (5) accesss to condenser (4), little steam turbine (5) are connected with water-feeding pump (6) from oxygen-eliminating device (8) export to boiler (1) on the trunk line of feedwater import, through little steam turbine (5) drive water-feeding pump (6) rotate.
7. The frequency modulation system configured with the heat pump and the steam ejector according to claim 6, wherein a high-pressure regenerative heater (7) is arranged downstream of the water feed pump (6), the steam extraction side of the high-pressure regenerative heater (7) is communicated with the extraction steam of the high-pressure cylinder (2) of the steam turbine, and the extraction steam flow of the high-pressure regenerative heater (7) is changed by changing the feed water flow of the high-pressure regenerative heater (7) in a short time.
8. A method of operating a fm system equipped with a heat pump and a vapor eductor as claimed in any one of claims 1 to 7, characterized by: the method comprises the following steps:
when the load of the unit is increased, the feed water flow in a main pipeline from the outlet of the deaerator (8) to the feed water inlet of the boiler (1) is reduced, and the feed water flow in a bypass pipeline from the outlet of the deaerator (8) to the feed water inlet of the boiler (1) is increased; meanwhile, the water supply in the bypass pipeline is heated in a multi-stage manner through a heat release heat exchanger in the heat pump system and a steam heat exchanger communicated with the outlet of the steam ejector (16).
9. The operating method of the frequency modulation system with a heat pump and a steam ejector according to claim 8, wherein when the load of the unit is reduced, the steam extraction amount of the small steam turbine (5) is increased, so that the rotating speed of the water feed pump (6) on the main water feed pipeline is increased, the water feed flow rate in the high-pressure regenerative heater (7) is increased, and the heat exchange temperature rise at the tube side of the high-pressure regenerative heater (7) is reduced, so that the outlet temperature at the tube side of the high-pressure regenerative heater (7) is reduced, the shell side pressure of the high-pressure regenerative heater (7) is reduced, and the pressure difference between the upper side and the lower side of the steam extraction pipeline is increased, so that the steam extraction amount of the high-pressure regenerative heater (7) from the high-pressure cylinder (2) is further increased, and the power generation of the unit is reduced;
meanwhile, the flow of the feed water in a bypass pipeline from the outlet of the deaerator (8) to the feed water inlet of the boiler (1) is reduced.
10. The operating method of a frequency modulation system with a heat pump and a steam ejector according to claim 9, wherein when the unit is operating normally or the load is reduced, the steam inlet valve of the steam extraction and storage tank is opened, steam is extracted from the medium and low pressure cylinder (3) of the steam turbine, and after the steam is stored, the steam inlet valve of the steam extraction and storage tank is closed.
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| CN202210963386.0A CN115126563A (en) | 2022-08-11 | 2022-08-11 | Frequency modulation system with heat pump and steam ejector and working method |
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| CN202210963386.0A CN115126563A (en) | 2022-08-11 | 2022-08-11 | Frequency modulation system with heat pump and steam ejector and working method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114754401A (en) * | 2022-03-11 | 2022-07-15 | 华电电力科学研究院有限公司 | Cogeneration system and method with absorption heat pump and steam ejector |
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2022
- 2022-08-11 CN CN202210963386.0A patent/CN115126563A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114754401A (en) * | 2022-03-11 | 2022-07-15 | 华电电力科学研究院有限公司 | Cogeneration system and method with absorption heat pump and steam ejector |
| CN114754401B (en) * | 2022-03-11 | 2023-06-20 | 华电电力科学研究院有限公司 | Cogeneration system and method for configuring absorption heat pump and steam ejector |
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