CN113375209B - Large temperature difference heat supply method and system for coal-fired unit coupling compression heat pump - Google Patents
Large temperature difference heat supply method and system for coal-fired unit coupling compression heat pump Download PDFInfo
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- CN113375209B CN113375209B CN202110717594.8A CN202110717594A CN113375209B CN 113375209 B CN113375209 B CN 113375209B CN 202110717594 A CN202110717594 A CN 202110717594A CN 113375209 B CN113375209 B CN 113375209B
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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
- F24D3/00—Hot-water central heating systems
- F24D3/02—Hot-water central heating systems with forced circulation, e.g. by pumps
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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
- F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1039—Arrangement or mounting of control or safety devices for water heating systems for central heating the system uses a heat pump
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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
- F24D3/00—Hot-water central heating systems
- F24D3/08—Hot-water central heating systems in combination with systems for 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
- F24D3/00—Hot-water central heating systems
- F24D3/10—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks Hydraulic components of a central heating system
- F24D3/1058—Feed-line arrangements, e.g. providing for heat-accumulator tanks, expansion tanks Hydraulic components of a central heating system disposition of pipes and pipe connections
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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
- F24D3/00—Hot-water central heating systems
- F24D3/18—Hot-water central heating systems using heat pumps
Abstract
The invention discloses a large temperature difference heat supply system of a coal-fired unit coupling compression heat pump, which is characterized by comprising a compression heat pump 1, a steam turbine intermediate pressure cylinder, a heat supply network circulating water pump 8, a first control valve a, a second control valve b, a third control valve c, a fourth control valve d, a heat supply network water supply pipeline, a heat supply condenser 2 and a peak heater 4; the invention solves the problems of coal-fired power plant efficiency and operation flexibility, and reduces pollutant discharge and resource consumption.
Description
Technical Field
The invention relates to the field of coal-fired units, in particular to a large-temperature-difference heat supply method and a large-temperature-difference heat supply system for a coal-fired unit coupled compression heat pump.
Background
The development of economy in China is not supported by a strong energy system. In recent years, the technology of thermal power generating units in China is greatly developed, and the method is changed from the modes of improving initial parameters, reheating steam and the like to the directions of full-working-condition operation, deep utilization of waste heat and the like. Meanwhile, in order to realize the development of an environment-friendly society, the small-sized heat supply boiler has low energy utilization rate. Pollutant discharge does not reach standard, is difficult to unified management, and small-size heat supply boiler is replaced by central heating gradually, improves the environmental problem that the haze is many in the north in winter, has also developed the central heating examination work in the cold area in south simultaneously. Therefore, the cogeneration of the thermal power generating unit has important significance for promoting energy conservation and emission reduction and building a resource-saving society.
At present, a condensing turbine and a back pressure turbine are mostly adopted by a cogeneration unit or a condenser turbine is enabled to improve back pressure operation under a heat supply working condition, so that the efficiency and the operation flexibility of a coal-fired power station are improved, and the problems of reducing pollutant emission and resource consumption are long-term concerns of the coal-fired power station.
Disclosure of Invention
The invention aims to provide a large-temperature-difference heat supply method and a large-temperature-difference heat supply system for a coal-fired unit coupled compression heat pump, and aims to solve the problems of efficiency and operation flexibility of a coal-fired power plant and reduce pollutant emission and resource consumption.
The invention provides a large temperature difference heating system of a coal-fired unit coupling compression heat pump, which comprises:
the system comprises a compression heat pump 1, a turbine intermediate pressure cylinder, a heat supply network circulating water pump 8, a first control valve a, a second control valve b, a third control valve c, a fourth control valve d, a heat supply network water supply pipeline, a heat supply condenser 2 and a peak heater 4; the heat supply network circulating water pump 8 is communicated with heat supply network backwater, an outlet of the heat supply network circulating water pump 8 is communicated with a cold source inlet of the compression heat pump 1, a cold source outlet of the compression heat pump 1 is communicated with a cold source inlet of the heat supply condenser 2, and a heated working medium outlet of the compression heat pump 1 is communicated with an inlet of the first control valve a and an inlet of the third control valve c; the steam extraction of the steam turbine medium pressure cylinder is communicated with an inlet of a fourth control valve d, a hot side working medium inlet of the peak heater 4 is communicated with an outlet of the fourth control valve d, a cold side working medium inlet of the peak heater 4 is communicated with an outlet of a first control valve a, a cold side working medium outlet is communicated with an inlet of a second control valve b, and an outlet of the second control valve b is communicated with an outlet of a third control valve c and a heat supply network water supply pipeline.
The system comprises: the low-pressure turbine is connected with the turbine intermediate pressure cylinder, the low-pressure turbine is connected with a heat supply condenser (2) hot side working medium inlet, and a heat supply condenser (2) hot side working medium outlet is connected with the condenser hot well.
The system further comprises: the low-pressure steam turbine generator comprises a generator and a small steam turbine exhaust steam heater (3), wherein the generator is connected with a compression type heat pump (1), a low-pressure steam turbine is connected with the generator, and a heated working medium inlet of the compression type heat pump (1) is communicated with a cold side working medium outlet of the small steam turbine exhaust steam heater (3).
The system further comprises: the heat supply network circulating water pump small steam turbine (7), the unit medium pressure steam turbine and the heat supply network circulating water pump small steam turbine (7) are connected in entry, the heat supply network circulating water pump (8) is connected with the heat supply network circulating water pump small steam turbine (7), the small steam turbine exhaust steam heater (3) is connected with the deaerator, and the peak heater (4) hot side working medium outlet is connected with the deaerator.
The invention provides a large temperature difference heat supply method of a coal-fired unit coupling compression heat pump, which comprises the following steps:
s1, boosting the return water of the heat supply network by a heat supply network circulating water pump 8, and then cooling the return water to a certain temperature by the cold source side of the compression heat pump 1;
s2, enabling the cooled return water of the heat supply network to enter a heat supply condenser 2 from an outlet at the cold source side of the compression heat pump 1, heating the heat supply condenser 2 to a certain temperature by using the exhaust steam of the low-pressure turbine, continuing to use the exhaust steam waste heat of the small steam turbine by using an exhaust steam heater 3 of the small steam turbine, and heating the return water of the heat supply network to a certain temperature through the heating side of the compression heat pump 1 for output;
s3, shunting partial working medium from the heating side of the compression heat pump 1 to enter the peak heater 4 according to the requirement, and adjusting the steam turbine exhaust steam and the heat supply network water quantity entering the peak heater 4 through the first control valve a, the second control valve b, the third control valve c and the steam turbine intermediate pressure cylinder exhaust steam.
The S1 specifically includes: the steam discharged by the medium-pressure steam turbine of the unit is sent to the small steam turbine (7) of the heat supply network circulating water pump to obtain driving steam, the small steam turbine (7) of the heat supply network circulating water pump drives the steam to provide power for the heat supply network circulating water pump (8) to boost pressure, and then the steam is cooled to a certain temperature through the cold source side of the compression heat pump (1).
The S2 specifically includes: the heat supply network backwater after cooling gets into heat supply condenser (2) from the export of compression heat pump (1) cold source side, and steam turbine intermediate pressure jar steam extraction to low pressure steam turbine (5) the condenser hot-well is arranged into after releasing heat in low pressure steam turbine (5), and the heat supply network backwater is heated the uniform temperature and gets into little steam turbine exhaust steam heater (3), and the deaerator deoxidization is imported to the deaerator to little steam turbine exhaust steam heater (3) heat back input compression heat pump (1) after little steam turbine exhaust steam heater (3) heat to the heat supply network circulating water pump exhaust steam, and low pressure steam turbine (5) drive generator (6) output electric energy compression heat pump (1) are as drive electric power, then are heated the uniform temperature output through compression heat pump (1) heating side.
The S3 specifically includes: the heat supply network backwater output from the heating side of the compression heat pump (1) is divided according to the demand, part of the heat supply network backwater enters the peak heater (4), part of the heat supply network backwater is input into the third control valve, the steam discharged by the steam turbine intermediate pressure cylinder is input into the peak heater (4) after passing through the fourth control valve to release heat and then is input into the deaerator to deaerate, part of the heat supply network backwater enters the peak heater (4) to be heated and then is input into the second control valve, and the heat supply network backwater output from the second control valve and the third control valve are converged and output after the temperature is adjusted.
By adopting the embodiment of the invention, the efficiency and the operation flexibility of the coal-fired power plant are solved, and the pollutant emission and the resource consumption are reduced.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
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 schematic diagram of a large temperature difference heating system of a coal-fired unit coupled compression heat pump according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a large temperature difference heating system of a coal-fired unit coupled compression heat pump according to an embodiment of the invention.
Description of reference numerals:
1: a compression type heat pump; 2: a heat supply condenser; 3: a small steam turbine exhaust steam heater; 4: a spike heater; 5: a low pressure turbine; 6: a generator; 7: a small steam engine; 8: a heat supply network circulating water pump; a: a first control valve; b: a second control valve; c: a third control valve; d: a fourth control valve.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, 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 is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and 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 considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; 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 in specific cases to those skilled in the art.
System embodiment
According to an embodiment of the present invention, a large temperature difference heating system of a coal-fired unit coupled compression heat pump is provided, fig. 1 is a schematic diagram of the large temperature difference heating system of the coal-fired unit coupled compression heat pump according to the embodiment of the present invention, as shown in fig. 1, specifically including:
the system comprises a compression heat pump 1, a turbine intermediate pressure cylinder, a heat supply network circulating water pump 8, a first control valve a, a second control valve b, a third control valve c, a fourth control valve d, a heat supply network water supply pipeline, a heat supply condenser 2 and a peak heater 4; the heat supply network circulating water pump 8 is communicated with heat supply network backwater, an outlet of the heat supply network circulating water pump 8 is communicated with a cold source inlet of the compression heat pump 1, a cold source outlet of the compression heat pump 1 is communicated with a cold source inlet of the heat supply condenser 2, and a heated working medium outlet of the compression heat pump 1 is communicated with an inlet of the first control valve a and an inlet of the third control valve c; the steam extraction of the steam turbine medium pressure cylinder is communicated with an inlet of a fourth control valve d, a hot side working medium inlet of the peak heater 4 is communicated with an outlet of the fourth control valve d, a cold side working medium inlet of the peak heater 4 is communicated with an outlet of a first control valve a, a cold side working medium outlet is communicated with an inlet of a second control valve b, and an outlet of the second control valve b is communicated with an outlet of a third control valve c and a heat supply network water supply pipeline.
The system comprises: the low pressure turbine is connected with the turbine intermediate pressure cylinder, the low pressure turbine is connected with the working medium inlet on the hot side of the heat supply condenser 2, and the working medium outlet on the hot side of the heat supply condenser 2 is connected with the hot well of the condenser.
The system comprises: the generator is connected with the compression heat pump 1, the low-pressure turbine is connected with the generator, and the heated working medium inlet of the compression heat pump 1 is communicated with the cold side working medium outlet of the small steam turbine exhaust steam heater 3.
The system comprises: the heat supply network circulating water pump small steam turbine 7 and the small steam turbine exhaust steam heater 3 are connected, the unit medium-pressure steam turbine is connected with an inlet of the small steam turbine 7 of the heat supply network circulating water pump, the heat supply network circulating water pump 8 is connected with the small steam turbine 7 of the heat supply network circulating water pump, the small steam turbine exhaust steam heater 3 is connected with the deaerator, and a working medium outlet at the hot side of the peak heater 4 is connected with the deaerator.
The specific implementation method of the system is as follows:
the return water temperature of the heat supply network is above 40 ℃, the water supply temperature of the heat supply network is more than 70-120 ℃, and the large temperature difference heat supply system and the operation method of the coal-fired unit coupling compression heat pump are provided.
The working process is as follows:
the utility model provides a coal-fired unit coupling compression heat pump's big difference in temperature heating system and operation method, includes compression heat pump 1, heat supply condenser 2, little steam turbine exhaust steam heater 3, peak heater 4, low pressure steam turbine 5, generator 6, little steam turbine 7 of heat supply network circulating water pump, heat supply network circulating water pump 8 and first control valve an, second control valve b, third control valve c and fourth control valve d, its characterized in that: the method comprises the following steps that hot network backwater firstly passes through a hot network circulating water pump 8 to complete a pressurization process, then water sequentially passes through the cold source side of a compression heat pump 1, a heat supply condenser 2, a small steam turbine exhaust steam heater 3 and the heated working medium side of the compression heat pump 1 to complete a basic heat load heating process, and finally a part of working medium enters a peak heater 8 according to the demand to complete the whole flow of water supply and heating of a hot network, and the exhaust steam of a medium pressure turbine of a unit is respectively communicated with an inlet of a low pressure turbine 5, an inlet of a small steam turbine 7 of the hot network circulating water pump and a working medium inlet of the hot side of the peak heater 4;
the discharged steam of the low-pressure turbine 5 enters a working medium inlet at the hot side of the heat supply condenser 2, the discharged heat enters a condenser hot well, and the low-pressure turbine 5 drives the generator 6 to output electric energy outwards;
the inlet of the heat supply network circulating water pump 8 is communicated with heat supply network backwater, the outlet of the heat supply network circulating water pump 8 is communicated with the cold source inlet of the compression heat pump 1, the temperature of heat supply network water at the cold source inlet of the compression heat pump 1 is about 40-45 ℃, the power of the heat supply network circulating water pump 8 is provided by the small steam turbine 7 of the heat supply network circulating water pump, the small steam turbine 7 of the heat supply network circulating water pump drives steam to come from a medium-pressure steam turbine of a unit for exhausting steam, the driven steam enters the working medium inlet at the hot side of the exhaust steam heater 3 of the small steam turbine after acting, and the heat is released and then converged into a condenser hot well;
the compressed heat pump 1 is driven by a generator 6, a cold source outlet of the compressed heat pump 1 is communicated with a cold source inlet of a heat supply condenser 2, a heated working medium inlet of the compressed heat pump 1 is communicated with a cold side working medium outlet of a small steam turbine exhaust steam heater 3, and the heated working medium outlet is communicated with an inlet of a first control valve a and an inlet of a third control valve c;
the cold side working medium outlet of the heat supply condenser 2 is communicated with the cold side working medium inlet of the small steam turbine exhaust steam heater 3, the temperature of the cold side working medium inlet of the heat supply condenser 2 is about 25-35 ℃, and the temperature of the cold side working medium outlet is about 50-55 ℃;
the steam extraction of the steam turbine medium pressure cylinder is communicated with an inlet of a fourth control valve d, a hot side working medium inlet of a peak heater 4 is communicated with an outlet of the fourth control valve d, the hot side working medium outlet is converged into a unit deaerator to be deaerated, a cold side working medium inlet of the peak heater 4 is communicated with an outlet of a first port control valve a, a cold side working medium outlet is communicated with an inlet of a second control valve b, and an outlet of the second control valve b is communicated with an outlet of a third control valve c and a heat supply network water supply pipeline;
a coal-fired unit coupling compression heat pump's big difference in temperature heating system and operation method, its operation method is: the return water of the heat supply network is firstly pressurized by 0.4-0.6MPa through a heat supply network circulating water pump 8, then is firstly cooled to 25-35 ℃ through the cold source side of a compression heat pump 1, then is heated to 50-60 ℃ through a heat supply condenser 2 by using the exhaust steam of a low-pressure turbine 4, then is continuously used by a small steam turbine exhaust steam heater, is then heated to 75-80 ℃ through the heating side of the compression heat pump 1, then is shunted according to the requirement to enter a part of working medium into a peak heater 4, and the steam turbine extraction and the heat supply network water quantity entering the peak heater 4 are adjusted, so that the water supply temperature of the heat supply network can be adjusted to 85-105 ℃, and the temperature requirements of different heat supply periods are met.
The long-term concern of coal-fired power stations is to improve the efficiency and the operation flexibility of the coal-fired power stations and reduce the emission of pollutants and the resource consumption.
(1) According to the invention, the compression heat pump is adopted to firstly reduce the temperature of the heat supply network, absorb the waste heat of the exhaust steam of the steam turbine and then raise the temperature through the compression heat pump, so that the cascade utilization of energy is realized, the low-temperature waste heat of the unit is reasonably utilized, and the irreversible loss of the system is small.
(2) The temperature of the return water of the heat supply network is reduced after passing through the heat pump, the waste heat at the cold end of the steam turbine can be utilized, the energy utilization efficiency is improved, the back pressure of the unit does not need to be greatly improved, and the flexibility of the electric load of the unit is not changed.
(3) The invention can adjust the water supply temperature of the heat supply network between 85 ℃ and 105 ℃ by adjusting the air exhaust of the steam turbine entering the peak heater and the water quantity of the heat supply network, thereby meeting the temperature requirements of different heat supply periods.
Method embodiment
According to an embodiment of the present invention, a large temperature difference heating system of a coal-fired unit coupled compression heat pump is provided, and fig. 2 is a schematic diagram of the large temperature difference heating system of the coal-fired unit coupled compression heat pump according to the embodiment of the present invention, as shown in fig. 2, specifically including:
s1, boosting the return water of the heat supply network by a heat supply network circulating water pump 8, and then cooling the return water to a certain temperature by the cold source side of the compression heat pump 1;
s2, enabling the cooled return water of the heat supply network to enter a heat supply condenser 2 from an outlet at the cold source side of the compression heat pump 1, heating the heat supply condenser 2 to a certain temperature by using the exhaust steam of the low-pressure turbine, continuing to use the exhaust steam waste heat of the small steam turbine by using an exhaust steam heater 3 of the small steam turbine, and heating the return water of the heat supply network to a certain temperature through the heating side of the compression heat pump 1 for output;
s3, shunting partial working medium from the heating side of the compression heat pump 1 to enter the peak heater 4 according to the requirement, and adjusting the steam turbine exhaust steam and the heat supply network water quantity entering the peak heater 4 through the first control valve a, the second control valve b, the third control valve c and the steam turbine intermediate pressure cylinder exhaust steam.
The steam discharged by the medium-pressure steam turbine of the unit reaches the small steam turbine 7 of the heat supply network circulating water pump to obtain driving steam, the small steam turbine 7 of the heat supply network circulating water pump drives the steam to provide power for the heat supply network circulating water pump 8 to be pressurized, and then the steam is cooled to a certain temperature through the cold source side of the compression heat pump 1.
The heat supply network return water after cooling gets into heat supply condenser 2 from the export of compression heat pump 1 cold source side, and steam turbine intermediate pressure jar exhaust steam to low pressure turbine 5 discharge the condenser hot-well after releasing heat in the low pressure turbine 5, the heat supply network return water is heated the uniform temperature and gets into little steam turbine exhaust steam heater 3, and the little steam turbine exhaust steam of heat supply network circulating water pump inputs the oxygen-eliminating device deoxidization to little steam turbine exhaust steam heater 3 after releasing heat, and the heat supply network return water is inputed compression heat pump 1 after little steam turbine exhaust steam heater 3 heats, and low pressure turbine 5 drives generator 6 output electric energy compression heat pump 1 as driving power, then is heated to the uniform temperature output through compression heat pump 1 heating side.
The heat supply network backwater output from the heating side of the compression heat pump 1 is divided according to the requirement, part of the heat supply network backwater enters the peak heater 4, part of the heat supply network backwater is input into the third control valve, the steam discharged by the steam turbine intermediate pressure cylinder is input into the peak heater 4 after passing through the fourth control valve to release heat and then is input into the deaerator to deaerate, part of the heat supply network backwater enters the peak heater 4 to be heated and then is input into the second control valve, and the heat supply network backwater output from the second control valve and the heat supply network backwater output from the third control valve are converged and output after adjusting the temperature.
The embodiment of the present invention is a system embodiment corresponding to the above method embodiment, and specific operations of each module may be understood with reference to the description of the method embodiment, which is not described herein again.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; however, these modifications or alternative technical solutions of the embodiments of the present invention do not depart from the scope of the present invention.
Claims (2)
1. A large temperature difference heating system of a coal-fired unit coupled compression heat pump is characterized by comprising,
the system comprises a compression heat pump (1), a turbine intermediate pressure cylinder, a heat supply network circulating water pump (8), a first control valve (a), a second control valve (b), a third control valve (c), a fourth control valve (d), a heat supply network water supply pipeline, a heat supply condenser (2) and a peak heater (4); the heat supply network circulating water pump (8) is communicated with heat supply network backwater, an outlet of the heat supply network circulating water pump (8) is communicated with a cold source inlet of the compression heat pump (1), a cold source outlet of the compression heat pump (1) is communicated with a cold source inlet of the heat supply condenser (2), and a heated working medium outlet of the compression heat pump (1) is communicated with an inlet of the first control valve (a) and an inlet of the third control valve (c); the steam extraction of the steam turbine intermediate pressure cylinder is communicated with the inlet of a fourth control valve (d), the hot side working medium inlet of a peak heater (4) is communicated with the outlet of the fourth control valve (d), the cold side working medium inlet of the peak heater (4) is communicated with the outlet of a first control valve (a), the cold side working medium outlet is communicated with the inlet of a second control valve (b), and the outlet of the second control valve (b) is communicated with the outlet of a third control valve (c) and a heat supply network water supply pipeline;
the system comprises: the low-pressure turbine is connected with the turbine intermediate pressure cylinder, the low-pressure turbine is connected with the hot side working medium inlet of the heat supply condenser (2), and the hot side working medium outlet of the heat supply condenser (2) is connected with the condenser hot well;
the system further comprises: the system comprises a generator and a small steam turbine exhaust steam heater (3), wherein the generator is connected with a compression heat pump (1), a low-pressure steam turbine is connected with the generator, and a heated working medium inlet of the compression heat pump (1) is communicated with a cold side working medium outlet of the small steam turbine exhaust steam heater (3);
the system further comprises: the heat supply network circulating water pump small steam turbine (7), the unit medium pressure steam turbine and the heat supply network circulating water pump small steam turbine (7) are connected in entry, the heat supply network circulating water pump (8) is connected with the heat supply network circulating water pump small steam turbine (7), the small steam turbine exhaust steam heater (3) is connected with the deaerator, and the peak heater (4) hot side working medium outlet is connected with the deaerator.
2. A large temperature difference heat supply method of a coal-fired unit coupling compression heat pump is characterized by comprising the following steps:
s1, boosting the backwater of the heat supply network by a heat supply network circulating water pump (8), and then cooling the backwater of the heat supply network to a certain temperature by a cold source side of the compression heat pump (1);
s2, feeding cooled return water of the heat supply network into a heat supply condenser (2) from an outlet at a cold source side of a compression heat pump (1), heating the heat supply condenser (2) to a certain temperature by using exhaust steam of a low-pressure turbine, continuing using the waste heat of the exhaust steam of the small steam turbine by using an exhaust steam heater (3) of the small steam turbine, and heating the return water of the heat supply network to a certain temperature through a heating side of the compression heat pump (1) for output;
s3, shunting partial working medium from the heating side of the compression heat pump (1) to enter a peak heater (4) according to requirements, and adjusting steam turbine exhaust and heat supply network water quantity entering the peak heater (4) through a first control valve (a), a second control valve (b), a third control valve (c) and steam turbine intermediate pressure cylinder exhaust;
the S1 specifically includes: the steam discharged by the medium-pressure steam turbine of the unit reaches a small steam turbine (7) of a heat supply network circulating water pump to obtain driving steam, the small steam turbine (7) of the heat supply network circulating water pump drives the steam to provide power for a heat supply network circulating water pump (8) to boost pressure, and then the steam is cooled to a certain temperature through a cold source side of a compression heat pump (1);
the S2 specifically includes: the cooled heat supply network backwater enters a heat supply condenser (2) from a cold source side outlet of a compression type heat pump (1), steam is discharged to a low-pressure turbine (5) by a turbine intermediate pressure cylinder, the heat is discharged to a condenser hot well after being released in the low-pressure turbine (5), the heat supply network backwater is heated to a certain temperature and enters a small steam turbine exhaust steam heater (3), the steam discharged from a small steam turbine of a heat supply network circulating water pump is discharged to the small steam turbine exhaust steam heater (3) to be input to a deaerator to be deaerated, the heat supply network backwater is heated by the small steam turbine exhaust steam heater (3) and then is input to the compression type heat pump (1), the low-pressure turbine (5) drives a generator (6) to output an electric energy compression type heat pump (1) as driving electric power, and then the electric energy compression type heat pump (1) is heated to a certain temperature to be output;
the S3 specifically includes: the heat supply network backwater output from the heating side of the compression heat pump (1) is divided according to the demand, part of the heat supply network backwater enters the peak heater (4), part of the heat supply network backwater is input into the third control valve, the steam discharged by the steam turbine intermediate pressure cylinder is input into the peak heater (4) after passing through the fourth control valve to release heat and then is input into the deaerator to deaerate, part of the heat supply network backwater enters the peak heater (4) to be heated and then is input into the second control valve, and the heat supply network backwater output from the second control valve and the third control valve are converged and output after the temperature is adjusted.
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| CN114413311B (en) * | 2022-01-20 | 2023-07-14 | 大唐环境产业集团股份有限公司 | Cold end waste heat supply system of coal-fired unit of coupling oblique temperature layer heat storage tank and operation method |
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