CN117318107B - High-pressure hot water energy storage peak shaving system of coal-fired unit - Google Patents
High-pressure hot water energy storage peak shaving system of coal-fired unit Download PDFInfo
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- CN117318107B CN117318107B CN202311240768.1A CN202311240768A CN117318107B CN 117318107 B CN117318107 B CN 117318107B CN 202311240768 A CN202311240768 A CN 202311240768A CN 117318107 B CN117318107 B CN 117318107B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 230
- 238000004146 energy storage Methods 0.000 title claims abstract description 91
- 238000000926 separation method Methods 0.000 claims abstract description 31
- 238000001704 evaporation Methods 0.000 claims abstract description 17
- 230000008020 evaporation Effects 0.000 claims abstract description 16
- 238000010248 power generation Methods 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims description 14
- 229920006395 saturated elastomer Polymers 0.000 claims description 4
- 238000005485 electric heating Methods 0.000 claims description 3
- 230000008859 change Effects 0.000 abstract description 10
- 230000004044 response Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 7
- 239000003245 coal Substances 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 238000005338 heat storage Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000021715 photosynthesis, light harvesting Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 108010001267 Protein Subunits Proteins 0.000 description 1
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000011490 mineral wool Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
- F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
- F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B3/00—Other methods of steam generation; Steam boilers not provided for in other groups of this subclass
- F22B3/04—Other methods of steam generation; Steam boilers not provided for in other groups of this subclass by drop in pressure of high-pressure hot water within pressure- reducing chambers, e.g. in accumulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
Abstract
The invention relates to the technical field of energy storage and peak shaving, in particular to a high-pressure hot water energy storage and peak shaving system of a coal-fired unit. In the system, the steam generation part comprises a hearth, a superheater and a furnace water loop arranged around the hearth; the power generation part comprises a turbine unit and a generator which are connected in sequence; the energy storage part comprises a high-pressure hot water energy storage unit and a steam-water separator, and the high-pressure hot water energy storage unit is connected with the boiler water loop; when the load is reduced, the high-pressure hot water in the furnace water loop is stored by the high-pressure hot water energy storage unit so as to reduce the evaporation capacity in the turbine unit; when the load is increased, the high-pressure hot water in the high-pressure hot water energy storage unit is subjected to depressurization flash evaporation to generate steam, and after the steam-water separation is realized through the steam-water separator, the steam is led into the turbine unit. The technical scheme of the invention can realize quick response to load change.
Description
Technical Field
The invention relates to the technical field of energy storage and peak shaving, in particular to a high-pressure hot water energy storage and peak shaving system of a coal-fired unit.
Background
The access of large-scale wind-solar renewable power is significant for constructing a novel power system, however, the volatility and randomness of wind-solar power generation form a great challenge for the power system. The rapid peak regulation of the coal-fired unit is a key technology for guaranteeing the stability of the power grid.
When the coal-fired unit generates electricity to participate in peak shaving, the main operation mode is to achieve the purpose of matching with the electricity consumption of the power grid by adjusting the load of the unit. The unit load change is generally to adjust the steam flow by changing the heat load of the hearth, thereby adjusting the work of the steam turbine. The furnace thermal load change mainly adjusts the coal grinding amount and the coal feeding amount by changing the coal grinding output, but adjusts the load by changing the coal feeding amount at the coal feeding side, so that the inertia of the adjustment is very large, and a long time is required, so that the response load speed is slow, and the rapid change of wind-solar renewable power supply is difficult to adapt.
Therefore, a high-pressure hot water energy storage peak shaving system of a coal-fired unit is needed to solve the technical problems.
Disclosure of Invention
In order to realize quick response to load change, the embodiment of the invention provides a high-pressure hot water energy storage peak shaving system of a coal-fired unit.
The embodiment of the invention provides a high-pressure hot water energy storage peak shaving system of a coal-fired unit, which comprises the following components:
the steam generation part comprises a hearth, a superheater and a furnace water loop arranged around the hearth, wherein the superheater is used for heating saturated steam in the furnace water loop to be superheated steam;
the power generation part comprises a turbine unit and a generator which are sequentially connected, and the inlet end of the turbine unit is connected with the superheater;
the energy storage part comprises a high-pressure hot water energy storage unit and a steam-water separator, the high-pressure hot water energy storage unit is connected with the furnace water loop, the inlet end of the steam-water separator is connected with the high-pressure hot water energy storage unit, the outlet end of the steam-water separator is respectively connected with a separation gas circuit and a separation water circuit, the separation gas circuit is connected with the steam turbine unit, and the separation water circuit is respectively connected with the furnace water loop and the high-pressure hot water energy storage unit;
when the load of the coal-fired unit is reduced, the high-pressure hot water in the boiler water loop is stored through the high-pressure hot water energy storage unit so as to reduce the evaporation capacity in the turbine unit;
when the load of the coal-fired unit is increased, the high-pressure hot water in the high-pressure hot water energy storage unit is subjected to depressurization flash evaporation to generate steam, and after the steam-water separation is realized through the steam-water separator, the steam is led into the steam-fired unit.
The embodiment of the invention provides a high-pressure hot water energy storage peak shaving system of a coal-fired unit, which can realize the change of the evaporation water quantity in a furnace water loop to change the generated steam quantity by utilizing a high-pressure hot water energy storage unit to store hot water in the furnace water loop when the coal-fired unit is subjected to load reduction; when the load of the coal-fired unit is increased, the high-pressure hot water in the high-pressure hot water energy storage unit is subjected to depressurization flash evaporation to generate steam, and after the steam-water separation is realized through the steam-water separator, the steam is led into the steam-turbine unit. Therefore, the above technical scheme can realize rapid response load change.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a high-pressure hot water energy storage peak shaving system for a coal-fired unit according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a high-pressure hot water energy storage peak shaving system of a coal-fired unit according to another embodiment of the present invention.
Reference numerals:
1-a steam generation part;
11-hearth;
12-superheater;
13-a furnace water loop;
131-a steam drum;
132-a downcomer;
133-a lower header;
134-water cooling wall;
135-upper header;
136-furnace water circulation pump;
2-a power generation section;
21-a turbine unit;
211-high pressure cylinder;
212-a medium pressure cylinder;
213-low pressure cylinder;
a 22-generator;
a 3-energy storage portion;
30-a one-way throttle valve;
31-an electrical energy storage;
32-a high-pressure hot water energy storage unit;
321-a high-pressure hot water accumulator;
322-pressure relief valve;
323-a heater;
33-a steam-water separator;
34-separating water pump;
a 35-cooler;
36-bypass water pump;
37-vacuum pump;
38-a compressor;
391-pressure sensor;
392-three-way valve.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making any inventive effort based on the embodiments of the present invention are within the scope of protection of the present invention.
As shown in fig. 1 and 2, the embodiment of the invention provides a high-pressure hot water energy storage peak shaving system of a coal-fired unit, which comprises a steam generation part 1, a power generation part 2 and an energy storage part 3, wherein:
the steam generation part 1 comprises a hearth 11, a superheater 12 and a furnace water loop 13 arranged around the hearth 11, wherein the superheater 12 is used for heating saturated steam in the furnace water loop 13 into superheated steam;
the power generation part 2 comprises a turbine unit 21 and a generator 22 which are sequentially connected, and the inlet end of the turbine unit 21 is connected with the superheater 12;
the energy storage part 3 comprises a high-pressure hot water energy storage unit 32 and a steam-water separator 33, the high-pressure hot water energy storage unit 32 is connected with the furnace water loop 13, the inlet end of the steam-water separator 33 is connected with the high-pressure hot water energy storage unit 32, the outlet end of the steam-water separator is respectively connected with a separation gas circuit and a separation water circuit, the separation gas circuit is connected with the turbine unit 21, and the separation water circuit is respectively connected with the furnace water loop 13 and the high-pressure hot water energy storage unit 32;
when the load of the coal-fired unit is reduced, the high-pressure hot water in the boiler water loop 13 is stored by the high-pressure hot water energy storage unit 32 so as to reduce the evaporation capacity in the turbine unit 21;
when the load of the coal-fired unit is increased, the high-pressure hot water in the high-pressure hot water energy storage unit 32 is subjected to depressurization flash evaporation to generate steam, and after the steam-water separation is realized through the steam-water separator 33, the steam is introduced into the steam-turbine unit 21.
In the embodiment, when the load of the coal-fired unit is reduced, the high-pressure hot water in the furnace water loop 13 is stored by the high-pressure hot water energy storage unit 32 so as to reduce the evaporation capacity in the turbine unit 21; when the load of the coal-fired unit is increased, the high-pressure hot water in the high-pressure hot water energy storage unit 32 is subjected to depressurization flash evaporation to generate steam, and after the steam-water separation is realized through the steam-water separator 33, the steam is introduced into the steam-turbine unit 21. Therefore, the above technical scheme can realize rapid response load change.
In one embodiment of the invention, the boiler water circuit 13 comprises a steam drum 131, a down pipe 132, a lower header 133, a water cooled wall 134 and an upper header 135 which are connected end to end in sequence, the down pipe 132 is provided with a boiler water circulation pump 136, the top of the steam drum 131 is connected with the superheater 12, and the high-pressure hot water storage unit 32 is connected with the steam drum 131 (shown in fig. 2) or the down pipe 132 (shown in fig. 1).
In the present embodiment, by connecting the high-pressure hot water storage unit 32 with the drum 131 or the down pipe 132, the amount of evaporated water in the boiler water circuit 13 can be reduced.
Because it is difficult to open the hole in the drum 131, it is preferable to connect the high-pressure hot water storage unit 32 to the down pipe 132 (i.e., it is easier to open the hole in the drum 131 than to open the hole in the down pipe 132).
In one embodiment of the present invention, the high-pressure hot water storage unit 32 includes at least one group of high-pressure hot water storage sub-units, each group of high-pressure hot water storage sub-units includes a high-pressure hot water storage 321, a pressure reducing valve 322 and a heater 323, which are sequentially connected, the high-pressure hot water storage 321 is connected with the steam drum 131 or the down pipe 132, the inlet end of the steam-water separator 33 is connected with the heater 323, and the heater 323 is electrically connected with the electric energy storage 31.
In the present embodiment, by providing the high-pressure hot water accumulator 321, high-pressure hot water from the drum 131 can be stored; by arranging the pressure reducing valve 322, the high-pressure hot water from the high-pressure hot water accumulator 321 can be subjected to pressure reducing flash evaporation when the load of the coal-fired unit needs to be increased, so that the high-pressure hot water can be quickly evaporated into steam to be sent to the steam turbine unit 21 for doing work; in addition, a water pump (hereinafter, bypass water pump 36) may be engaged by the pressure reducing valve 322 to provide the power required for fluid flow.
As shown in fig. 1 and 2, when the high-pressure hot water storage unit 32 includes at least two groups of high-pressure hot water storage subunits (where fig. 1 and 2 each show three groups of high-pressure hot water storage subunits), the high-pressure hot water storage subunits are connected in parallel, so that the fault tolerance of energy storage and peak shaving can be increased.
In some embodiments, the high pressure hot water accumulator 321 is made of a heat insulating material (e.g., aluminum silicate+rock wool board), so that the energy dissipation of the high pressure hot water stored therein is smaller to maintain the high temperature and high pressure state all the time.
To further ensure that the energy dissipation of the high-pressure hot water stored inside the high-pressure hot water accumulator 321 is smaller, active heat preservation or active heating of the high-pressure hot water inside the high-pressure hot water accumulator 321 may be considered.
In one embodiment of the invention, the outlet end of the superheater 12 is connected to the high pressure hot water accumulator 321 via a steam bypass provided with a one-way throttle valve 30 and a vacuum pump 37, the superheated steam in the steam bypass being used for heating the high pressure hot water in the high pressure hot water accumulator 321.
In the present embodiment, by using the steam bypass, part of the superheated steam taken out from the superheater 12 can be used to heat or insulate the hot water in the high-pressure hot water accumulator 321, so that the energy dissipation of the high-pressure hot water stored in the high-pressure hot water accumulator 321 can be further ensured to be smaller, and the subsequent load lifting of the coal-fired unit is facilitated.
Of course, the mode of actively insulating or actively heating the high-pressure hot water in the high-pressure hot water accumulator 321 may also adopt an electric heating mode, for example, an electric heater heats an intermediate medium (such as water or steam), and then the heated intermediate medium transfers heat to the high-pressure hot water in the high-pressure hot water accumulator 321. The electric heater may be an electric network or an electric energy accumulator, which is not specifically limited herein.
It should be noted that, the portion of the superheated steam taken out from the superheater 12 may also serve as a load reducing function, but if the portion of the superheated steam is fully heated or kept warm for the hot water in the high-pressure hot water accumulator 321, heat waste of the portion of the superheated steam taken out from the superheater 12 may be caused.
To solve the technical problem, in one embodiment of the present invention, the steam bypass is provided with a steam storage tank (not shown in the figure), the inlet end and the outlet end of the steam storage tank are both provided with a one-way throttle valve 30, and a second temperature sensor (not shown in the figure) is arranged in the high-pressure hot water accumulator 321;
when the temperature detected by the second temperature sensor is lower than the preset temperature, the superheated steam in the steam storage tank is used to heat the high-pressure hot water in the high-pressure hot water accumulator 321.
In the embodiment, by arranging the steam storage tank at the steam bypass, the real-time water temperature in the high-pressure hot water accumulator 321 can be used at any time, so as to avoid wasting the heat of part of the superheated steam taken out from the superheater 12; and the superheated steam in the redundant steam storage tank can be output to the steam turbine unit 21 preferentially when the load of the coal-fired unit rises (namely, the steam storage tank can be connected with the steam turbine unit 21 through a pipeline).
In one embodiment of the present invention, the energy storage part 3 further includes a cooler 35 and a bypass water pump 36, and the drum 131, the cooler 35, the bypass water pump 36 and the high pressure hot water accumulator 321 are sequentially connected (as shown in fig. 2), or the down pipe 132, the cooler 35, the bypass water pump 36 and the high pressure hot water accumulator 321 are sequentially connected (as shown in fig. 1), and the hot water pressure in the high pressure hot water accumulator 321 is greater than the hot water pressure in the drum 131 or the down pipe 132.
In the present embodiment, by providing the cooler 35, it is possible to prevent the saturated water from evaporating to become steam, so as to prevent cavitation of the bypass water pump 36; by providing the bypass water pump 36, on the one hand, the high-pressure hot water from the drum 131 can be pressurized to prevent the gasification into steam, and on the other hand, the high-pressure hot water in the drum 131 can be supplied to the high-pressure hot water accumulator 321 to be stored.
It should be noted that, due to the bypass water pump 36, the hot water pressure in the high pressure hot water accumulator 321 can be raised (i.e., greater than the hot water pressure in the drum 131 or the downcomer 132), so that the pressure reducing valve 322 can be coupled (i.e., the front-to-back pressure differential is increased), thereby allowing the high pressure hot water to flash into steam more quickly.
In one embodiment of the invention, the cooler 35 takes the form of convective heat transfer, the cooler 35 being cooled by external cooling water from the drum 131 or down tube 132. By doing so, it is possible to ensure more effective cooling of the hot water from the drum 131 or the down tube 132.
In one embodiment of the invention, the separating waterway is provided with a one-way throttle valve 30 and a separating water pump 34, the inlet end and the outlet end of the high-pressure hot water accumulator 321 are provided with the one-way throttle valve 30, and the one-way throttle valve 30 is arranged between the heater 323 and the inlet end of the steam-water separator 33.
In the present embodiment, by providing the one-way throttle valve 30 in each waterway or gas passage, it is possible to prevent backflow of fluid (i.e., including high-pressure hot water or steam) and to regulate the flow rate of fluid.
Considering that the parameters of the steam generated by the flash evaporation, including temperature and pressure, are matched to the fluid parameters required by the turbine unit 21, a heater 323 may be provided after the pressure reducing valve 322 to increase the temperature of the steam subsequently entering the turbine unit 21. For example, if the temperature of the steam entering the high pressure cylinder needs to be higher, the heater 323 may be used to heat the steam generated by the flash evaporation, while the temperature of the steam entering the medium pressure cylinder and the low pressure cylinder may not need to be too high, the heater 323 may be turned on timely, and details thereof will not be described herein.
In order to heat the steam generated by flash evaporation, in one embodiment of the invention, each group of high-pressure hot water energy storage subunits further comprises a heater 323, wherein the heater 323 is connected between the pressure reducing valve 322 and the steam-water separator 33, and the heater 323 is used for heating the steam discharged by the pressure reducing valve 322;
the energy storage part 3 further includes a first temperature sensor (not shown in the drawing) provided in the separation gas path, and a controller (not shown in the drawing) electrically connected to the first temperature sensor, for controlling the heating amount of the heater 323 according to the temperature detected by the first temperature sensor.
In one embodiment of the present invention, the energy storage part 3 further includes an electric energy storage 31, the heater 323 takes the form of electric heating, an input end of the electric energy storage 31 is electrically connected to the generator 22, an output end of the electric energy storage 31 is electrically connected to the heater 323, and a heating amount of the heater 323 is obtained by controlling electric energy output from the electric energy storage 31 to the heater 323.
Of course, the heater 323 may adopt a heating mode of heat exchange of superheated steam, that is, part of superheated steam is extracted from the superheater 12 and introduced into the heater 323, heat exchange is performed on an intermediate medium (for example, water) in the heater 323, and then the steam discharged from the pressure reducing valve 322 is heated by the intermediate medium.
With continued reference to FIG. 1, in one embodiment of the invention, turbine set 21 includes a high pressure cylinder 211, a medium pressure cylinder 212, and a low pressure cylinder 213 connected in sequence, high pressure cylinder 211 being connected to superheater 12, low pressure cylinder 213 being connected to generator 22;
the energy storage part 3 further comprises a pressure sensor 391 and a three-way valve 392, wherein the pressure sensor 391 and the three-way valve 392 are sequentially arranged on the separation gas circuit, two outlet ends of the three-way valve 392 are respectively connected with the medium pressure cylinder 212 and the low pressure cylinder 213, a controller is respectively electrically connected with the pressure sensor 391 and the three-way valve 392, and the controller is used for controlling the on-off of the two outlet ends of the three-way valve 392 according to the pressure of the separation gas circuit detected by the pressure sensor 391.
In this embodiment, by providing the pressure sensor 391 and the three-way valve 392 in the energy storage section 3, the controller can control the on-off of the two outlet ends of the three-way valve 392 according to the pressure of the separation gas path detected by the pressure sensor 391, so that the high-temperature steam discharged from the separation gas path of the steam-water separator 33 is sent to the medium-pressure cylinder 212 and the low-pressure cylinder 213 with matched pressure, thereby completing the load lifting of the coal-fired unit.
With continued reference to FIG. 2, in one embodiment of the invention, turbine set 21 includes a high pressure cylinder 211, a medium pressure cylinder 212, and a low pressure cylinder 213 connected in sequence, high pressure cylinder 211 being connected to superheater 12, low pressure cylinder 213 being connected to generator 22;
the energy storage part 3 further comprises a compressor 38, the compressor 38 is respectively connected with the heater 323 and the steam-water separator 33, the compressor 38 is used for pressurizing high-temperature steam at the outlet of the heater 323, and the separation gas circuit is connected with the high-pressure cylinder 211.
In this embodiment, by providing the compressor 38 in the energy storage portion 3, the compressor 38 can be used to pressurize the high-temperature steam at the outlet of the heater 323, and the finally obtained high-pressure high-temperature steam is discharged through the separation gas path of the steam-water separator 33 and then sent to the high-pressure cylinder 211 to do work, thereby completing the load lifting of the coal-fired unit.
By arranging the steam-water separator 33, not only the separated steam can be sent to the turbine unit 21 to do work, but also the turbine unit 21 can be prevented from being corroded by water so as to ensure the safe and stable operation of the turbine unit 21, and the separated steam can be circulated and returned to the high-pressure hot water accumulator 321 or the lower header 133 after passing through the separation water channel through the separation water pump 34, so that the water consumption is saved.
In summary, the heat storage technology is one of important development directions in the energy storage technology, and the high-capacity heat storage participates in peak shaving of the power system, so that the space-time optimizing configuration capacity of the energy system can be improved, and the energy system can be used as a flexible and controllable load to improve the regulating capacity of the power system. When the steam supply side is used for changing the steam quantity to adjust the load, the change of the steam quantity can adopt a heat storage mode, and when the load is reduced, high-pressure hot water in a hearth or overheated steam at an outlet of a superheater is stored, so that the aim of reducing the total steam quantity adjusting load is fulfilled; when the load is lifted, the stored high-pressure hot water or the stored superheated steam is returned to the steam loop to supplement the total steam quantity; meanwhile, the total energy in the load changing process can be less dissipated by adopting a heat storage form.
It is noted that relational terms such as first and second, and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one …" does not exclude the presence of additional identical elements in a process, method, article or apparatus that comprises the element.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a coal-fired unit high pressure hot water energy storage peak shaving system which characterized in that includes:
a steam generation part (1) comprising a hearth (11), a superheater (12) and a furnace water loop (13) arranged around the hearth (11), wherein the superheater (12) is used for heating saturated steam in the furnace water loop (13) to be changed into superheated steam;
a power generation part (2) comprising a turbine unit (21) and a generator (22) which are sequentially connected, wherein an inlet end of the turbine unit (21) is connected with the superheater (12);
the energy storage part (3) comprises a high-pressure hot water energy storage unit (32) and a steam-water separator (33), the high-pressure hot water energy storage unit (32) is connected with the furnace water loop (13), the inlet end of the steam-water separator (33) is connected with the high-pressure hot water energy storage unit (32), the outlet end of the steam-water separator is respectively connected with a separation gas circuit and a separation water circuit, the separation gas circuit is connected with the steam turbine unit (21), and the separation water circuit is respectively connected with the furnace water loop (13) and the high-pressure hot water energy storage unit (32);
when the load of the coal-fired unit is reduced, the high-pressure hot water in the boiler water loop (13) is stored through the high-pressure hot water energy storage unit (32) so as to reduce the evaporation capacity in the steam turbine unit (21);
when the load of the coal-fired unit is increased, the high-pressure hot water in the high-pressure hot water energy storage unit (32) is subjected to depressurization flash evaporation to generate steam, and after the steam-water separation is realized through the steam-water separator (33), the steam is led into the steam-turbine unit (21).
2. The high-pressure hot water energy storage peak shaving system of the coal-fired unit according to claim 1, wherein the boiler water loop (13) comprises a steam drum (131), a descending pipe (132), a lower header (133), a water-cooled wall (134) and an upper header (135) which are sequentially connected end to end, the descending pipe (132) is provided with a boiler water circulation pump (136), the top of the steam drum (131) is connected with the superheater (12), and the high-pressure hot water energy storage unit (32) is connected with the steam drum (131) or the descending pipe (132).
3. The high-pressure hot water energy storage peak shaving system of a coal-fired unit according to claim 2, wherein the high-pressure hot water energy storage unit (32) comprises at least one group of high-pressure hot water energy storage subunits, each group of high-pressure hot water energy storage subunits comprises a high-pressure hot water energy storage device (321) and a pressure reducing valve (322) which are sequentially connected, the high-pressure hot water energy storage device (321) is connected with the steam drum (131) or the descending pipe (132), and the inlet end of the steam-water separator (33) is connected with the pressure reducing valve (322).
4. A coal-fired unit high pressure hot water energy storage peak shaving system according to claim 3, wherein each group of the high pressure hot water energy storage subunits further comprises a heater (323), the heater (323) is connected between the pressure reducing valve (322) and the steam-water separator (33), and the heater (323) is used for heating steam discharged by the pressure reducing valve (322);
the energy storage part (3) further comprises a first temperature sensor and a controller, the first temperature sensor is arranged in the separation gas circuit, the controller is electrically connected with the first temperature sensor, and the controller is used for controlling the heating capacity of the heater (323) according to the temperature detected by the first temperature sensor.
5. The high-pressure hot water energy storage peak shaving system of a coal-fired unit according to claim 4, wherein the energy storage part (3) further comprises an electric energy storage device (31), the heater (323) is in an electric heating mode, the input end of the electric energy storage device (31) is electrically connected with the generator (22), the output end of the electric energy storage device is electrically connected with the heater (323), and the heating quantity of the heater (323) is obtained by controlling electric energy output by the electric energy storage device (31) to the heater (323).
6. A coal-fired unit high-pressure hot water energy storage peak shaving system according to claim 3, wherein the energy storage part (3) further comprises a cooler (35) and a bypass water pump (36), the steam drum (131), the cooler (35), the bypass water pump (36) and the high-pressure hot water energy storage (321) are sequentially connected, or the downcomers (132), the cooler (35), the bypass water pump (36) and the high-pressure hot water energy storage (321) are sequentially connected, and the hot water pressure in the high-pressure hot water energy storage (321) is greater than the hot water pressure in the steam drum (131) or the downcomers (132).
7. A coal-fired unit high pressure hot water energy storage peak shaving system according to claim 3, characterized in that the outlet end of the superheater (12) is connected with the high pressure hot water accumulator (321) through a steam bypass, the steam bypass is provided with a one-way throttle valve (30) and a vacuum pump (37), and superheated steam in the steam bypass is used for heating the high pressure hot water in the high pressure hot water accumulator (321).
8. The high-pressure hot water energy storage peak shaving system of the coal-fired unit according to claim 7, wherein the steam bypass is provided with a steam storage tank, the inlet end and the outlet end of the steam storage tank are both provided with one-way throttle valves (30), and a second temperature sensor is arranged in the high-pressure hot water energy accumulator (321);
and when the temperature detected by the second temperature sensor is lower than a preset temperature, the superheated steam in the steam storage tank is utilized to heat the high-pressure hot water in the high-pressure hot water accumulator (321).
9. The coal-fired unit high-pressure hot water energy storage peak shaving system according to claim 4, wherein the steam turbine unit (21) comprises a high-pressure cylinder (211), a medium-pressure cylinder (212) and a low-pressure cylinder (213) which are sequentially connected, the high-pressure cylinder (211) is connected with the superheater (12), and the low-pressure cylinder (213) is connected with the generator (22);
the energy storage part (3) further comprises a pressure sensor (391) and a three-way valve (392), the pressure sensor (391) and the three-way valve (392) are sequentially arranged in the separation gas circuit, two outlet ends of the three-way valve (392) are respectively connected with the medium pressure cylinder (212) and the low pressure cylinder (213), the controller is respectively electrically connected with the pressure sensor (391) and the three-way valve (392), and the controller is used for controlling the on-off of two outlet ends of the three-way valve (392) according to the pressure of the separation gas circuit detected by the pressure sensor (391).
10. The coal-fired unit high-pressure hot water energy storage peak shaving system according to claim 4, wherein the steam turbine unit (21) comprises a high-pressure cylinder (211), a medium-pressure cylinder (212) and a low-pressure cylinder (213) which are sequentially connected, the high-pressure cylinder (211) is connected with the superheater (12), and the low-pressure cylinder (213) is connected with the generator (22);
the energy storage part (3) further comprises a compressor (38), the compressor (38) is respectively connected with the heater (323) and the steam-water separator (33), the compressor (38) is used for pressurizing steam at the outlet of the heater (323), and the separation gas circuit is connected with the high-pressure cylinder (211).
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| AU2008262309A1 (en) * | 2007-06-06 | 2008-12-18 | Areva Solar, Inc. | Combined cycle power plant |
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