CN111456818A - Double-source heating fused salt energy storage system of thermal power plant - Google Patents
Double-source heating fused salt energy storage system of thermal power plant Download PDFInfo
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- CN111456818A CN111456818A CN202010334421.3A CN202010334421A CN111456818A CN 111456818 A CN111456818 A CN 111456818A CN 202010334421 A CN202010334421 A CN 202010334421A CN 111456818 A CN111456818 A CN 111456818A
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- 150000003839 salts Chemical class 0.000 title claims abstract description 213
- 238000010438 heat treatment Methods 0.000 title claims abstract description 50
- 238000004146 energy storage Methods 0.000 title claims abstract description 28
- 238000005338 heat storage Methods 0.000 claims abstract description 62
- 238000010248 power generation Methods 0.000 claims abstract description 28
- 230000005611 electricity Effects 0.000 claims abstract description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 39
- 238000001704 evaporation Methods 0.000 claims description 20
- 230000008020 evaporation Effects 0.000 claims description 18
- 238000013021 overheating Methods 0.000 claims description 12
- 238000003303 reheating Methods 0.000 claims description 10
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims 1
- 238000005485 electric heating Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 125000004122 cyclic group Chemical group 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
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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
- F01K3/00—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein
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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
- F01K13/00—General layout or general methods of operation of complete plants
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Abstract
The invention relates to a double-source heating molten salt energy storage system of a thermal power plant, which comprises a thermal power generation system, a double-source heating molten salt system and a molten salt heat storage system, wherein the thermal power generation system, the double-source heating molten salt system and the molten salt heat storage system are sequentially connected, so that the heat exchange function between high-grade steam and electric power of the thermal power generation system and the molten salt heat storage system is realized. The full load peak regulation of the thermal power plant can be realized by mixing and heating the molten salt through steam and electricity. The double-source heating fused salt energy storage system of the thermal power plant can also ensure that most of high-grade steam heat energy is stored, the steam turbine generator unit operates at a low load, and the generated power further heats the fused salt for heat storage, so that the thermal power plant unit has full-load deep peak regulation capacity and rapid load increase capacity after peak regulation.
Description
Technical Field
The invention relates to the technical field of energy storage, in particular to a double-source heating molten salt energy storage system of a thermal power plant.
Background
The thermoelectric proportion of the coal burning of the thermal power generating unit is high, the peak regulation power supply is poor in construction condition, the thermal power generating unit operates in a mode of fixing the power by heat in the heating period, the small output in winter is about 60-70 percent generally, and the peak regulation in the heating period in winter is difficult, so that the problems of wind and light abandonment in the national range are serious, and the aim of adjusting the energy structure in China is not facilitated.
The scholars in China put forward the fused salt heat storage technology of a thermal power plant, which is used for peak shaving of a thermal generator set. As can be seen from the published literature, the current main technical solutions include: extracting steam to heat fused salt energy storage, extracting part of high-temperature reheat steam to heat fused salt energy storage, and extracting part of main steam to heat fused salt energy storage.
Although the current molten salt heat storage technical scheme can achieve the purpose of energy storage, the current molten salt heat storage technical scheme can only reduce partial electric load of a thermal power plant and cannot achieve the purposes of deep peak regulation of a unit and zero-power internet access. Part of the heat storage capacity of the molten salt heat storage system is limited by heat supply load, and part of the molten salt heat storage system cannot store steam phase change heat, so that heat is wasted.
Disclosure of Invention
In order to solve the problems, the invention provides a double-source heating fused salt energy storage system of a thermal power plant, which can realize full-load peak regulation of the thermal power plant by heating fused salt through the mixing of steam and electricity; the double-source heating fused salt energy storage system of the thermal power plant can also ensure that most of high-grade steam heat energy is stored, the steam turbine generator unit operates at low load, and the generated power further heats the fused salt for heat storage, so that the thermal power plant unit has full-load deep peak regulation capacity and rapid load increase capacity after peak regulation.
The technical scheme adopted by the invention is as follows: the utility model provides a thermal power factory double-source heating fused salt energy storage system, includes thermal power system, steam heating fused salt system and fused salt heat-retaining system, its characterized in that: the double-source heating molten salt system is used for heating electricity and steam in a mixed mode, consists of six heat exchangers and is respectively connected with the thermal power generation system and the molten salt heat storage system, and the heat exchange function between high-grade steam and electricity of the thermal power generation system and the molten salt heat storage system is achieved.
Preferably, the double-source heating molten salt system comprises an overheating heater, an evaporation heater, a preheating heater A, a high-pressure water feed pump and a high-pressure water feed temperature mixing device, wherein part of high-pressure main steam of the thermal power generation system enters the overheating heater through a steam inlet pipeline of the overheating heater to exchange heat with molten salt in the overheating heater, then enters the evaporation heater through a steam outlet pipeline of the heating heater to exchange heat with the molten salt in the evaporation heater, is condensed into high-pressure water, then enters the preheating heater A through a high-pressure water inlet pipeline of the preheating heater A to be changed into high-pressure supercooled water, and finally is pressurized and sent to the water supply system through the high-pressure water feed pump to realize high-.
Furthermore, double-source heating fused salt system still includes reheat heater, preheating heater B and vapor compressor, thermal power system's part high temperature reheat steam gets into reheat heater through reheat heater steam inlet pipeline, with the interior fused salt heat transfer of reheat heater, then gets into preheating heater B through reheat heater steam outlet pipeline, becomes low pressure reheat steam and then sends back low temperature reheating system after being pressurized by vapor compressor, realizes high temperature reheat steam vapor-water circulation.
Furthermore, the low-temperature molten salt in the low-temperature molten salt heat storage tank of the molten salt heat storage system is pressurized by a low-temperature molten salt pump and then is divided into two paths of molten salts, one path of molten salt enters the preheating heater A to be heated, the other path of molten salt enters the preheating heater B to be heated, the two paths of molten salt are mixed and then enter the evaporation heater, the two paths of molten salt are divided into two paths of molten salt again after being heated, one path of molten salt enters the overheating heater to be heated, the other path of molten salt enters the reheating heater to be heated, the two paths of molten salt are mixed and then enter the molten salt electric heater group to be further.
Furthermore, the low-temperature molten salt in the low-temperature molten salt heat storage tank of the molten salt heat storage system is pressurized by a low-temperature molten salt pump and is divided into three molten salts, the first molten salt enters a preheating heater A to be heated, the second molten salt enters a preheating heater B to be heated, the first molten salt and the second molten salt are mixed and then enter an evaporating heater (the first molten salt and the second molten salt are heated by the evaporating heater and then are divided into two molten salts again, the first molten salt enters a overheating heater to be heated, the other molten salt enters a reheating heater to be heated, the third molten salt enters a molten salt electric heater group to be directly heated by electricity, the three molten salts are heated and then directly mixed and are sent to the high-temperature molten.
Furthermore, the high-temperature and high-pressure steam generated by the thermal power generation system is used for directly heating the fused salt for energy storage, and the rest of the high-temperature and high-pressure steam is used for generating power by a steam turbine generator unit, the generated power is used for a fused salt electric heater group, the fused salt heat storage temperature is increased, and zero power networking and rapid load increase after peak shaving in a thermal power plant can be realized.
Furthermore, the working temperature of the high-temperature molten salt heat storage tank is 440 ℃.
Further, the working temperature of the low-temperature molten salt heat storage tank is 290 ℃.
The beneficial effects obtained by the invention are as follows: the method is characterized in that partial high-temperature and high-pressure steam of a thermal power plant is adopted to heat fused salt, high-pressure main steam and high-temperature reheat steam simultaneously heat fused salt, and low-temperature fused salt is heated into high-temperature fused salt. And the high-pressure main steam is cooled by the molten salt to become high-pressure condensed water, and the high-pressure condensed water is pressurized and then returns to a boiler water supply system to finish the cyclic heating. The high-temperature reheated steam is cooled by molten salt to become low-pressure reheated steam, and the low-pressure reheated steam is pressurized by a steam compressor and then returns to a boiler reheater through a low-temperature reheating system to complete the cyclic heating. And (3) sending the rest high-temperature and high-pressure steam of the thermal power plant into a steam turbine, continuously doing work to generate power, and using the power for heating molten salt to store heat. Therefore, the variable load of the turbine can be realized, the safe operation of the boiler and the turbine can be ensured, and the deep peak regulation and the high-efficiency heat storage can be realized.
The invention has the following advantages:
(1) the low-load operation of a boiler and a steam turbine is realized, so that the thermal power plant has full-load deep peak regulation capacity;
(2) after peak regulation, the requirement of rapid load increase of power grid dispatching is met;
(3) the heat storage efficiency is higher, the heat of high-grade steam can be directly stored, and the low-efficiency heat storage of the electric heating molten salt is reduced as much as possible.
Drawings
FIG. 1 is a schematic flow diagram of a dual-source heating molten salt energy storage system of a thermal power plant according to the present invention;
FIG. 2 is another embodiment of the present invention;
reference numerals: 1. a conventional thermal power generation system; 1.1, a high-pressure main steam pipeline; 1.2, a high-temperature reheating steam pipeline; 1.3, a low-temperature reheat steam pipeline; 1.4, a water supply pipeline; 1.5, a condensed water pipeline; 1.6, a boiler; 1.7, a steam turbine generator unit; 2. a steam-heated molten salt system; 2.1, overheating a heater; 2.11, a superheated heater steam inlet conduit; 2.12, a superheated heater molten salt outlet pipeline; 2.13, a superheated heater steam outlet pipeline; 2.14, a superheated heater molten salt inlet pipeline; 2.2, a reheating heater; 2.21, reheat heater steam inlet line; 2.22, a reheat heater molten salt outlet pipeline; 2.23, reheat heater steam outlet line; 2.24, a reheat heater molten salt inlet pipeline; 2.3, an evaporation heater; a2.4, preheating a heater; 2.41, preheating a high-pressure water inlet pipeline of a heater A; 2.42, preheating a molten salt outlet pipeline of the heater A; 2.43, preheating a high-pressure water outlet pipeline of the heater A; 2.44, preheating heater A molten salt inlet pipeline; 2.5, preheating a heater B; 2.51, preheating a steam outlet pipeline of a heater B; 2.52, preheating a heater B molten salt inlet pipeline; 2.53, preheating a molten salt outlet pipeline of the heater B; 2.6, a vapor compressor; 2.61, a vapor compressor outlet vapor line; 2.7, a molten salt electric heater group; 2.8, a high-pressure water feed pump; 2.9, a high-pressure water supply and temperature mixing device; 2.91, a high-pressure water supply bypass pipeline; 3. a molten salt heat storage system; 3.1, a high-temperature molten salt heat storage tank; 3.11, a molten salt pipeline at the inlet of the high-temperature molten salt heat storage tank; 3.2, a low-temperature molten salt heat storage tank; 3.3, a low-temperature molten salt pump.
Detailed Description
The invention will be further described with reference to the following drawings and specific embodiments.
As shown in fig. 1, the dual-source heating molten salt energy storage system of the thermal power plant comprises a thermal power generation system 1, a dual-source heating molten salt system 2 and a molten salt heat storage system 3, wherein the dual-source heating molten salt system 2 is used for heating by mixing electricity and steam and is respectively connected with the thermal power generation system 1 and the molten salt heat storage system 3, so that the heat exchange function between high-grade steam and electricity of the thermal power generation system 1 and the molten salt heat storage system 3 is realized. In this embodiment, the thermal power generation system 1 is a conventional thermal power generation system, and the steam heating molten salt module and the electric heating molten salt module are operated in series.
The specific heat storage process is as follows:
part of high-pressure main steam of the conventional thermal power generation system 1 enters the superheated heater 2.1 through the superheated heater steam inlet pipeline 2.11, exchanges heat with molten salt in the superheated heater 2.1, then enters the evaporation heater 2.3 through the hot heater steam outlet pipeline 2.13, exchanges heat with molten salt in the evaporation heater 2.3, is condensed into high-pressure water, enters the preheating heater A2.4 through the preheating heater A high-pressure water inlet pipeline 2.41, becomes high-pressure supercooled water, and is finally pressurized and sent to a water supply system through the high-pressure water feed pump 2.8, so that high-pressure steam-water circulation is realized.
Part of high-temperature reheat steam of the conventional thermal power generation system 1 enters the reheat heater 2.2 through a reheat heater steam inlet pipeline 2.21, exchanges heat with molten salt in the reheat heater 2.2, then enters the preheat heater B2.5 through a reheat heater steam outlet pipeline 2.23, is changed into low-pressure reheat steam, is pressurized by a steam compressor 2.6 and then is sent back to the low-temperature reheat system, and the steam-water circulation of the high-temperature reheat steam is realized.
The low-temperature molten salt in the low-temperature molten salt heat storage tank 3.2 of the molten salt heat storage system 3 is pressurized by a low-temperature molten salt pump 3.3 and then divided into two paths of molten salt, one path of molten salt enters a preheating heater A2.4 to be heated, the other path of molten salt enters a preheating heater B2.5 to be heated, the two paths of molten salt are mixed and then enter an evaporation heater 2.3, the two paths of molten salt are heated and then divided into two paths of molten salt again, one path of molten salt enters a superheating heater 2.1 to be heated, the other path of molten salt enters a reheating heater 2.2 to be heated, the two paths of molten salt are mixed and then enter a molten salt electric heater group 2.7 to be further heated by electricity.
Except for directly heating the fused salt for energy storage, the high-temperature and high-pressure steam generated by the conventional thermal power generation system 1 is used for generating power by a steam turbine generator unit, the generated power is used for a fused salt electric heater unit 2.7, the fused salt heat storage temperature is increased, and zero power internet access and rapid load increase after peak shaving in a thermal power plant can be realized.
According to different unit parameters of a thermal power plant, the working temperature of the high-temperature molten salt heat storage tank 3.1 may be different, and under the conventional subcritical and supercritical unit parameter conditions, the working temperature of the high-temperature molten salt heat storage tank 3.1 is about 440 ℃, and the working temperature of the low-temperature molten salt heat storage tank 3.2 is about 290 ℃.
In another embodiment:
as shown in fig. 2, the dual-source heating molten salt energy storage system of the thermal power plant comprises a thermal power generation system 1, a dual-source heating molten salt system 2 and a molten salt heat storage system 3, wherein the dual-source heating molten salt system 2 is used for heating by mixing electricity and steam and is respectively connected with the thermal power generation system 1 and the molten salt heat storage system 3, so that the heat exchange function between high-grade steam and electricity of the thermal power generation system 1 and the molten salt heat storage system 3 is realized. In this embodiment, the thermal power generation system 1 is a conventional thermal power generation system, and the steam heating molten salt module and the electric heating molten salt module are operated in parallel.
The specific heat storage process is as follows:
part of high-pressure main steam of the conventional thermal power generation system 1 enters the superheated heater 2.1 through the superheated heater steam inlet pipeline 2.11, exchanges heat with molten salt in the superheated heater 2.1, then enters the evaporation heater 2.3 through the hot heater steam outlet pipeline 2.13, exchanges heat with molten salt in the evaporation heater 2.3, is condensed into high-pressure water, enters the preheating heater A2.4 through the preheating heater A high-pressure water inlet pipeline 2.41, becomes high-pressure supercooled water, and is finally pressurized and sent to a water supply system through the high-pressure water feed pump 2.8, so that high-pressure steam-water circulation is realized.
Part of high-temperature reheat steam of the conventional thermal power generation system 1 enters the reheat heater 2.2 through a reheat heater steam inlet pipeline 2.21, exchanges heat with molten salt in the reheat heater 2.2, then enters the preheat heater B2.5 through a reheat heater steam outlet pipeline 2.23, is changed into low-pressure reheat steam, is pressurized by a steam compressor 2.6 and then is sent back to the low-temperature reheat system, and the steam-water circulation of the high-temperature reheat steam is realized.
The low-temperature molten salt in the low-temperature molten salt heat storage tank 3.2 of the molten salt heat storage system 3 is pressurized by a low-temperature molten salt pump 3.3 and then divided into three paths of molten salt.
The first path enters a preheating heater A2.4 to be heated, the second path enters a preheating heater B2.5 to be heated, two paths of molten salts are mixed and then enter an evaporation heater 2.3, and the mixture is divided into two paths of molten salts again after being heated; one path enters the overheating heater 2.1 to be heated, and the other path enters the reheating heater 2.2 to be heated. The third path enters a molten salt electric heater group 2.7 and is directly heated by electricity to raise the temperature. The three paths of molten salts are directly mixed after being heated and are sent to the high-temperature molten salt heat storage tank 3.1, and the flowing and heat storage of the molten salt loop are realized.
Except for directly heating the fused salt for energy storage, the high-temperature and high-pressure steam generated by the conventional thermal power generation system 1 is used for generating power by a steam turbine generator unit, the generated power is used for a fused salt electric heater unit 2.7, the fused salt heat storage temperature is increased, and zero power internet access and rapid load increase after peak shaving in a thermal power plant can be realized.
According to different unit parameters of a thermal power plant, the working temperature of the high-temperature molten salt heat storage tank 3.1 may be different, and under the condition of conventional subcritical and supercritical unit parameters, the working temperature of the high-temperature molten salt heat storage tank 3.1 is about 400 ℃, and the working temperature of the low-temperature molten salt heat storage tank 3.2 is about 290 ℃.
The foregoing shows and describes the general principles and principal structural features of the present invention. The present invention is not limited to the above examples, and various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The utility model provides a thermal power factory double-source heating fused salt energy storage system, includes thermal power system (1), double-source heating fused salt system (2) and fused salt heat-retaining system (3), its characterized in that: the thermal power generation system (1), the double-source heating molten salt system (2) and the molten salt heat storage system (3) are sequentially connected, and the heat exchange function between high-grade steam and electric power of the thermal power generation system (1) and the molten salt heat storage system (3) is realized.
2. The dual-source heating molten salt energy storage system of a thermal power plant of claim 1, characterized in that: the double-source heating molten salt system (2) comprises an overheating heater (2.1), an evaporation heater (2.3), a preheating heater A (2.4), a high-pressure water feed pump (2.8) and a high-pressure water-feeding temperature mixing device (2.9), wherein part of high-pressure main steam of the thermal power generation system (1) enters the overheating heater (2.1) through a steam inlet pipeline (2.11) of the overheating heater to exchange heat with molten salt in the overheating heater (2.1); then enters the evaporation heater (2.3) through a steam outlet pipeline (2.13) of the hot heater, exchanges heat with molten salt in the evaporation heater (2.3), condenses into high-pressure water, enters the preheating heater A (2.4) through a high-pressure water inlet pipeline (2.41) of the preheating heater A, and becomes high-pressure supercooled water; and finally, the steam is pressurized and sent to a water supply system by a high-pressure water feed pump (2.8) to realize high-pressure steam-water circulation.
3. The dual-source heating molten salt energy storage system of a thermal power plant of claim 2, characterized in that: double-source heating fused salt system (2) still include reheat heater (2.2), preheat heater B (2.5) and vapor compressor (2.6), some high temperature reheat steam of thermal power system (1) gets into reheat heater (2.2) through reheat heater steam inlet pipeline (2.21), and with reheat heater (2.2) interior fused salt heat transfer, then get into preheat heater B (2.5) through reheat heater steam outlet pipeline (2.23), send back low temperature reheat system after becoming low pressure reheat steam and being pressurizeed by vapor compressor (2.6), realize high temperature reheat steam soda circulation.
4. The dual-source heating molten salt energy storage system of a thermal power plant of claim 3, characterized in that: the low-temperature molten salt in a low-temperature molten salt heat storage tank (3.2) of the molten salt heat storage system (3) is pressurized by a low-temperature molten salt pump (3.3) and then divided into two paths of molten salt, wherein one path of molten salt enters a preheating heater A (2.4) to be heated, the other path of molten salt enters a preheating heater B (2.5) to be heated, and the two paths of molten salt are mixed and then enter an evaporation heater (2.3);
the molten salt is heated by an evaporation heater (2.3) and then divided into two paths of molten salts again, one path of molten salt enters a superheating heater (2.1) to be heated, the other path of molten salt enters a reheating heater (2.2) to be heated, and the two paths of molten salts are mixed and then enter a molten salt electric heater group (2.7);
the molten salt is further electrically heated by a molten salt electric heater group (2.7) to raise the temperature, and finally returns to the high-temperature molten salt heat storage tank (3.1), so that the flowing and heat storage of the molten salt loop are realized.
5. The dual-source heating molten salt energy storage system of a thermal power plant of claim 3, characterized in that: the low-temperature molten salt in a low-temperature molten salt heat storage tank (3.2) of the molten salt heat storage system (3) is pressurized by a low-temperature molten salt pump (3.3) and is divided into three molten salts, the first molten salt enters a preheating heater A (2.4) to be heated, the second molten salt enters a preheating heater B (2.5) to be heated, and the first molten salt and the second molten salt are mixed and then enter an evaporation heater (2.3); the molten salt is heated by an evaporation heater (2.3) and then divided into two paths of molten salt again, the first path of molten salt enters a superheating heater (2.1) to be heated, and the other path of molten salt enters a reheating heater (2.2) to be heated;
the third path enters a molten salt electric heater group (2.7) and is directly heated by electricity to raise the temperature;
the three molten salts are heated and then directly mixed, and are sent to a high-temperature molten salt heat storage tank (3.1), so that the flowing and heat storage of a molten salt loop are realized.
6. The dual-source heating molten salt energy storage system of a thermal power plant according to claim 4 or 5, characterized in that: high-temperature and high-pressure steam generated by the thermal power generation system (1) is used for directly heating fused salt for energy storage, other high-temperature and high-pressure steam is used for generating power by a steam turbine generator unit, generated power is used for a fused salt electric heater group (2.7), the fused salt heat storage temperature is improved, and zero power internet access and rapid load increase after peak shaving of a thermal power plant can be realized during peak shaving.
7. The dual-source heating molten salt energy storage system of a thermal power plant according to claim 4 or 5, characterized in that: the working temperature of the high-temperature molten salt heat storage tank (3.1) is about 440 ℃.
8. The dual-source heating molten salt energy storage system of a thermal power plant according to claim 4 or 5, characterized in that: the working temperature of the low-temperature molten salt heat storage tank (3.2) is about 290 ℃.
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