CN108561282B - Trough type direct steam and molten salt combined thermal power generation system - Google Patents
Trough type direct steam and molten salt combined thermal power generation system Download PDFInfo
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- CN108561282B CN108561282B CN201810228338.0A CN201810228338A CN108561282B CN 108561282 B CN108561282 B CN 108561282B CN 201810228338 A CN201810228338 A CN 201810228338A CN 108561282 B CN108561282 B CN 108561282B
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- 150000003839 salts Chemical class 0.000 title claims abstract description 143
- 238000010248 power generation Methods 0.000 title claims abstract description 43
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 54
- 239000007788 liquid Substances 0.000 claims abstract description 29
- 238000005338 heat storage Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 11
- 230000008569 process Effects 0.000 claims abstract description 9
- 238000001704 evaporation Methods 0.000 claims abstract description 5
- 230000001172 regenerating effect Effects 0.000 claims abstract description 5
- 238000003303 reheating Methods 0.000 claims abstract description 5
- 230000007246 mechanism Effects 0.000 claims description 13
- 238000004146 energy storage Methods 0.000 claims description 8
- 238000011084 recovery Methods 0.000 claims description 7
- 239000012071 phase Substances 0.000 claims description 6
- 239000007791 liquid phase Substances 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 3
- 230000008020 evaporation Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 2
- 230000005494 condensation Effects 0.000 claims description 2
- 238000009833 condensation Methods 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000005514 two-phase flow Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000006872 improvement Effects 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
- 229920006395 saturated elastomer Polymers 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G6/00—Devices for producing mechanical power from solar energy
- F03G6/06—Devices for producing mechanical power from solar energy with solar energy concentrating means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
- F01D15/10—Adaptations for driving, or combinations with, electric generators
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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
- F01K3/18—Plants characterised by the use of steam or heat accumulators, or intermediate steam heaters, therein having heaters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
Abstract
The invention relates to a trough type direct steam and molten salt combined thermal power generation system. The system comprises a direct steam system, a turbine power generation system, a feedwater regenerative system and a condensing system; the direct steam system comprises a direct steam solar heat collection field, a steam heat exchanger, a medium-temperature heat storage device, a water mixer, a gas-liquid separator and the like; the solar heat collection system also comprises a molten salt heat collection system with the function of a superheated steam section, wherein the molten salt heat collection system comprises a trough type molten salt solar heat collection field, a high-temperature molten salt tank, a high Wen Lengrong molten salt tank, a superheater and the like. When the system works, the preheating and evaporating processes of water in the system are completed in a direct steam solar heat collection field in a direct steam system, and the superheating and reheating processes are completed in a molten salt superheater and a reheater in a molten salt system; the high-temperature working medium at the outlet of the molten salt system only exchanges heat with the superheater and the reheater, so that the heat transfer temperature difference inside the heat exchanger is reduced, the exergy loss of the heat exchanger is reduced, and the efficiency of the thermal power generation system can be improved by 15-20%.
Description
Technical Field
The invention belongs to the technical field of solar power generation, and particularly relates to a groove type solar thermal power generation system.
Background
Solar energy is the most widely distributed renewable energy source with the most abundant reserves. In order to improve the quality and utilization efficiency of solar energy, solar high-temperature heat utilization has attracted a great deal of attention. The trough solar thermal power generation is the most mature technology and the lowest cost solar thermal power generation technology at present. The traditional conventional solar trough type thermal power generation system comprises a solar heat collection system, a heat storage system, a heat transmission and exchange system, a power generation system and the like. The solar heat collection system comprises a high-temperature vacuum heat collection tube, a condenser, a tracking mechanism, and related connecting pipelines and valves.
For a power station of heat conduction oil and molten salt working medium, a condenser focuses solar radiation rays on a groove type vacuum heat collecting pipe on a parabolic groove focal line, and the heat conduction working medium and the pipe wall of the heat collecting pipe perform heat convection to be heated. The heated heat transfer medium then passes through a series of heat exchangers to produce steam, the energy of which is passed through a steam power cycle to produce electricity. After heating the steam, the heat transfer working medium returns to the solar heat collection field. The heat collecting field heating loop of the groove type solar thermal power generation system is long, so that the heat loss of the groove type solar thermal power generation system mainly comes from the heat collecting field pipeline and the heat collecting pipe. The temperature of the conventional commercially operated groove type thermal power generation system can reach 400 ℃, and in order to improve the power generation efficiency of the system, the operating temperature of the groove type thermal power generation system has a trend of further improvement. At present, the highest temperature of an experimental power station adopting molten salt as a heat transfer working medium can reach 550 ℃. With the rise of the temperature of the heat collection field, the heat loss of the heat collection tube increases exponentially and the heat loss of the connecting pipeline increases remarkably. Therefore, the heat loss of the groove type heat collection field is reduced, and the method has important significance for improving the efficiency of the thermal power generation system. Meanwhile, in the steam generator, the boiling temperature of steam is far lower than the outlet temperature of the heat collection field, and the steam has larger exergy loss in the heat exchange process of the heat exchanger.
The tank type direct steam power generation technology has higher efficiency, smaller environmental pollution and lower investment, and is the most potential technology in the solar thermal power generation technology. However, due to the intermittence and periodicity of solar radiation, the control problem of the system is very complex, in addition, the instability of the two-phase flow in the heat collecting tube, the heat transfer of the superheating section is deteriorated, and the development of the direct steam power generation technology is limited.
The invention comprises the following steps:
in order to improve the efficiency of a tank type thermal power generation system and reduce the power generation cost, the invention provides a tank type direct steam and molten salt combined thermal power generation system.
The combined heat power generation system of the groove type direct steam and the molten salt comprises a direct steam system 2, a steam turbine power generation system 5, a feedwater regenerative system 3 and a condensation system 4;
the turbine power generation system 5 comprises a turbine high-pressure cylinder, a turbine medium-pressure cylinder, a turbine low-pressure cylinder and a generator set;
the water supply heat recovery system 3 comprises a high-pressure heat exchanger, a low-pressure heat exchanger, a deoxidizing water tank, a pre-pump and a condensate pump; the low-pressure heat exchanger is connected with the low-pressure cylinder; the high-pressure heat exchanger is connected with a high-pressure cylinder of the steam turbine; the deaeration water tank is respectively connected with the middle pressure cylinder, the low pressure heat exchanger, the pre-pump and the high pressure heat exchanger of the steam turbine;
the condensing system 4 comprises a cooling tower and a condenser; the condenser is respectively connected with the low-pressure cylinder of the steam turbine and the inlet of a condensate pump of the water supply heat recovery system 3;
the direct steam system 2 comprises a direct steam solar heat collection field 20, a water pump 21, a liquid storage tank 22, a steam heat exchanger 23, a medium-temperature heat storage device 24, a water mixer 25 and a gas-liquid separator 26; the inlet of the direct steam solar heat collection field 20 is sequentially connected with a water pump 21, a liquid storage tank 22 and a water mixer 25 in series; the outlet of the direct steam solar thermal-arrest field 20 is connected to the inlet of the gas-liquid separation 26; the gas phase outlet of the gas-liquid separator 26 is connected with the steam inlet of the superheater 15, and the liquid phase outlet of the gas-liquid separator 26 is connected with the inlet of the water mixer 25; the steam heat exchanger 23 is connected in parallel with the direct steam solar heat collection field 20; the inlet and the outlet of the medium-temperature heat storage device 24 are respectively connected with the heat storage working medium outlet and inlet of the steam heat exchanger 23;
the solar heat collection system for the molten salt comprises a molten salt heat collection system 1, wherein the molten salt heat collection system 1 comprises a trough type molten salt solar heat collection field 10, a high-temperature molten salt tank 18, a high-temperature Wen Lengrong molten salt tank 11, a molten salt pump 12, an expansion tank 13, a molten salt mixer 14, a superheater 15, a reheater 16 and a molten salt splitter 17; the inlet of the molten salt solar heat collection field 10 is sequentially connected with a molten salt pump 12, an expansion tank 13 and a molten salt mixer 14 in series, and a high Wen Lengrong molten salt tank 11 is connected in parallel on a pipeline between the inlet of the molten salt solar heat collection field 10 and the outlet of the molten salt pump 12 through a second valve 110 connected in series; the outlet of the molten salt solar heat collection field 10 is sequentially connected with a molten salt diverter 17, a superheating mechanism and a molten salt mixer 14 in series, wherein the superheating mechanism consists of a superheater 15 and a reheater 16 which are connected in parallel; the pipeline between the outlet of the molten salt solar heat collection field 10 and the inlet of the molten salt splitter 17 is connected in parallel with a high-temperature molten salt tank 18 through a first valve 19 connected in series, and the outlet of the high-temperature molten salt tank 18 is connected in series with a pump 111; the steam outlet of the superheater 15 is connected with the steam inlet of the high-pressure cylinder of the steam turbine; the steam outlet of the reheater 16 is connected with the steam inlet of the intermediate pressure cylinder of the steam turbine;
the molten salt heat collecting system 1 has the function of a superheated steam section;
in operation, the preheating and evaporation of water in the system is accomplished in the direct steam solar thermal collection field 20 in the direct steam system 2, and the superheating and reheating processes are accomplished in the molten salt superheater 16 and reheater 15 in the molten salt system 1.
The further defined technical scheme is as follows:
the medium-temperature heat storage system 24 is a phase change energy storage device or a double-tank molten salt energy storage device or a single-tank inclined temperature layer energy storage device or a latent heat concrete heat storage device.
The direct steam solar heat collection field 20 comprises a groove type direct steam groove type heat collection pipe, a groove type condenser, a tracking mechanism, a steam connecting pipeline, a pump and a valve, which are connected according to the connection relation of the conventional solar heat collection field.
The molten salt solar heat collection field 10 comprises a trough type molten salt heat collection pipe, a trough type condenser, a tracking mechanism, a molten salt connecting pipeline, a related pump and a valve, which are connected according to the connection relation of the conventional solar heat collection field.
The condensing system 4 is a water-cooled condenser or an air-cooled condenser.
The low-pressure cylinder of the steam turbine is formed by connecting more than two stages of low-pressure cylinders in series.
The beneficial technical effects of the invention are as follows:
1. by adopting a trough type direct steam and molten salt combined thermal power generation system, the two systems are effectively combined and complementary in advantages. Different from the traditional heat collection system adopting a single working medium, the heat collection system comprises the following components: the preheating and evaporating processes of water are completed in a direct steam solar heat collection field in a direct steam system, and the superheating and reheating processes are completed in a molten salt superheater and a reheater in a molten salt system.
2. The high-temperature working medium at the outlet of the molten salt system only exchanges heat with the superheater and the reheater, so that the heat transfer temperature difference inside the heat exchanger is reduced, and the exergy loss of the heat exchanger is reduced. Meanwhile, the length of a high-temperature molten salt loop of the heat collection field is reduced by 60-70% compared with that of a traditional molten salt heat collection system, the heat loss of the heat collection field in sunny days can be reduced by 30-40%, and the heat preservation and heat tracing energy consumption at night can be reduced by 50-60%, so that the efficiency of the thermal power generation system can be improved by 15-20%.
3. The direct steam system eliminates the superheated steam section relative to conventional steam systems. The gas-liquid separator arranged at the outlet of the direct steam solar heat collection field can ensure the steam output of stable parameters, so that the direct steam solar heat collection field can adopt larger water flow, the heat transfer stability of two-phase flow is improved, and meanwhile, the damage of heat transfer deterioration of a traditional direct steam system superheated steam section to a heat collection tube is eliminated. The high-temperature molten salt loop is adopted to reheat and overheat the steam, so that the stability of output steam parameters can be improved, and the running stability of the system can be improved.
4. The invention can greatly reduce the usage amount of molten salt, obviously reduce the initial investment cost of the power station and reduce the unit power cost.
Drawings
FIG. 1 is a schematic diagram of a trough direct steam and molten salt cogeneration system of the invention.
FIG. 2 is a schematic diagram of a molten salt system of the present invention.
Fig. 3 is a schematic diagram of a direct steam system of the present invention.
Number in the upper diagram: the system comprises a molten salt heat collecting system 1, a direct steam heat collecting system 2, a feedwater heat recovery system 3, a condensing system 4, a steam turbine power generation system 5, a trough type molten salt solar heat collecting field 10, a high Wen Lengrong molten salt tank 11, a molten salt pump 12, an expansion tank 13, a molten salt mixer 14, a superheater 15, a reheater 16, a molten salt splitter 17, a high-temperature molten salt tank 18, a first valve 19, a direct steam solar heat collecting field 20, a water pump 21, a liquid storage tank 22, a steam heat exchanger 23, a medium-temperature heat storage device 24, a water mixer 25, a gas-liquid separator 26, a steam valve 27, a second valve 110 and a pump 111.
The specific embodiment is as follows:
the present invention will be described in further detail with reference to the drawings by way of examples, for further explanation of the features and functions of the present invention.
Referring to fig. 1, a combined trough direct steam and molten salt thermal power generation system includes a direct steam system 2, a turbine power generation system 5, a feedwater regenerative system 3, a condensing system 4, and a molten salt heat collection system 1.
The turbine power generation system 5 comprises a turbine high-pressure cylinder, a turbine medium-pressure cylinder, a turbine low-pressure cylinder and a generator set, wherein the turbine low-pressure cylinder is formed by connecting more than two stages of three low-pressure cylinders in series.
The water supply heat recovery system 3 comprises a high-pressure heat exchanger, a low-pressure heat exchanger, a deaeration water tank, a pre-pump and a condensate pump; the low-pressure heat exchanger is connected with the low-pressure cylinder; the high-pressure heat exchanger is connected with a high-pressure cylinder of the steam turbine; the deoxidizing water tank is respectively connected with the middle pressure cylinder, the low pressure heat exchanger, the pre-pump and the high pressure heat exchanger of the steam turbine.
The condensing system 4 is a water-cooled condenser and comprises a cooling tower and a condenser; the condenser is respectively connected with the low-pressure cylinder of the steam turbine and the inlet of the condensate pump of the feedwater heat recovery system 3.
Referring to fig. 2, the direct steam system 2 includes a direct steam solar thermal field 20, a water pump 21, a liquid storage tank 22, a steam heat exchanger 23, a medium temperature heat storage device 24, a water mixer 25, and a gas-liquid separator 26. The direct steam solar heat collection field 20 comprises a groove type direct steam groove type heat collection pipe, a groove type condenser, a tracking mechanism, a steam connecting pipeline, a pump and a valve, which are connected according to the connection relation of the conventional solar heat collection field; the inlet of the direct steam solar thermal-arrest field 20 is connected in series with a water pump 21, a liquid storage tank 22 and a water mixer 25. The outlet of the direct steam solar thermal-arrest field 20 is connected to the inlet of the gas-liquid separation 26; the gas phase outlet of the gas-liquid separator 26 is connected to the steam inlet of the superheater 15, and the liquid phase outlet of the gas-liquid separator 26 is connected to the inlet of the water mixer 25. The steam heat exchanger 23 is connected in parallel with the direct steam solar thermal collection field 20. The medium-temperature heat storage system 24 is a phase-change energy storage device, and an inlet and an outlet of the medium-temperature heat storage device 24 are respectively connected with a heat storage working medium outlet and an inlet of the steam heat exchanger 23.
Referring to fig. 3, the molten salt heat collecting system 1 has the function of a superheated steam section; the molten salt heat collecting system 1 comprises a trough type molten salt solar heat collecting field 10, a high-temperature molten salt tank 18, a high-temperature Wen Lengrong molten salt tank 11, a molten salt pump 12, an expansion tank 13, a molten salt mixer 14, a superheater 15, a reheater 16 and a molten salt splitter 17; the molten salt solar thermal-collecting field 10 comprises a trough type molten salt thermal-collecting tube, a trough type condenser, a tracking mechanism, a molten salt connecting pipeline and related pumps and valves, which are connected according to the connection relation of the conventional solar thermal-collecting field. The inlet of the molten salt solar heat collection field 10 is sequentially connected with a molten salt pump 12, an expansion tank 13 and a molten salt mixer 14 in series, and a high Wen Lengrong molten salt tank 11 is connected in parallel on a pipeline between the inlet of the molten salt solar heat collection field 10 and the outlet of the molten salt pump 12 through a second valve 110 connected in series; the outlet of the molten salt solar heat collection field 10 is sequentially connected with a molten salt diverter 17, a superheating mechanism and a molten salt mixer 14 in series, wherein the superheating mechanism consists of a superheater 15 and a reheater 16 which are connected in parallel; the pipeline between the outlet of the molten salt solar heat collection field 10 and the inlet of the molten salt splitter 17 is connected in parallel with a high-temperature molten salt tank 18 through a first valve 19 connected in series, and the outlet of the high-temperature molten salt tank 18 is connected in series with a pump 111; the steam outlet of the superheater 15 is connected with the steam inlet of the high-pressure cylinder of the steam turbine; the steam outlet of the reheater 16 is connected with the steam inlet of the intermediate pressure cylinder of the steam turbine.
The main steam temperature of a steam turbine adopted in the steam turbine power generation system 5 is 540 ℃, the pressure is 13Mpa, the reheat steam temperature is 540 ℃, the pressure is 1.8Mpa, and the feed water temperature is 222 ℃.
In operation, the preheating and evaporation of water in the system is accomplished in the direct steam solar thermal collection field 20 in the direct steam system 2, and the superheating and reheating processes are accomplished in the molten salt superheater 16 and reheater 15 in the molten salt system 1.
The specific working principle is described as follows:
the water in the liquid storage tank 22 of the direct steam system 2 is conveyed to the direct steam solar heat collection field 20 through the water pump 21, the water is preheated and boiled in the direct steam solar heat collection field 20, and is output from the direct steam solar heat collection field 20 in a water vapor mixture state of 330 ℃, part of the water vapor mixture enters the steam heat exchanger 23 to exchange heat with the medium temperature energy storage device 24, and condensed water returns to the inlet of the direct steam solar heat collection field 20; the other part of the water passes through the gas-liquid separator 26, saturated water at the liquid phase outlet of the gas-liquid separator 26 is mixed with feed water at the outlet of the feed water regenerative system 3 in the water mixer 25 to return to the direct steam solar heat collection field 20, and dry steam at the gas phase outlet of the gas-liquid separator 26 enters the superheater 15. In the period of no solar irradiation such as night or rainy days, a steam valve 27 connected with the direct steam solar heat collection field 20 is closed, as shown in fig. 3, loop water is preheated and boiled by a steam heat exchanger 23, and sequentially passes through a gas-liquid separator 26, steam generates high-temperature high-pressure steam by the heater 15, and the liquid phase of the gas-liquid separator 26 returns to the water mixer 25 to be mixed with feed water to complete a heating cycle again.
The molten salt at 340 ℃ in the expansion tank 13 of the molten salt heat collecting system 1 is conveyed to the molten salt solar heat collecting field 10 through the molten salt pump 12, the molten salt solar heat collecting field 10 is heated to 550 ℃, part of the molten salt enters the high-temperature molten salt tank 18, part of the molten salt enters the superheater 15 and the reheater 16 through the molten salt splitter 17 to heat steam, the temperature of the molten salt is reduced to 340 ℃, and the molten salt in the molten salt tank 11 with part of the molten salt with the height Wen Lengrong is mixed to return to the molten salt solar heat collecting field 10. During periods of no solar irradiation, such as at night or in rainy days, the first valve 19 and the second valve 110 connected with the molten salt solar thermal-collecting field 10 are closed, see fig. 2, the molten salt in the high-temperature hot-molten salt tank 18 is conveyed to the superheater 15 and the reheater 16 through the pump 111 (see fig. 2), and the temperature of the molten salt is reduced to 340 ℃ and enters the high Wen Lengrong molten salt tank 11.
In the turbine power generation system 5, the superheated steam generated by the heater 15 enters a high-pressure cylinder of the turbine power generation system, expansion work is completed in the high-pressure cylinder, and the superheated steam enters a medium-pressure cylinder to continue expansion work through the gas-liquid separator 26 and the high-pressure heat exchanger; part of exhaust gas of the medium pressure cylinder enters the first-stage low pressure cylinder to continue expansion and work, and the other part enters the deoxidizing water tank; one part of the exhaust gas of the first-stage low-pressure cylinder enters the first-stage low-pressure heat exchanger, and the other part enters the second-stage low-pressure cylinder; one part of exhaust gas of the second-stage low-pressure cylinder enters the second-stage low-pressure heat exchanger, and the other part enters the third-stage low-pressure cylinder; the third-stage low-pressure cylinder exhaust enters a condenser, and condensed water sequentially passes through a first low-pressure heat exchanger, a second low-pressure heat exchanger, a deoxidizing water tank and a high-pressure heat exchanger and enters a direct steam solar heat collection field 20.
The present invention has been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, and modifications and fine adjustments are within the scope of the present invention by those skilled in the art without departing from the spirit of the present invention.
Claims (6)
1. A trough type direct steam and molten salt combined thermal power generation system comprises a direct steam system (2), a turbine power generation system (5), a feedwater regenerative system (3) and a condensation system (4);
the turbine power generation system (5) comprises a turbine high-pressure cylinder, a turbine medium-pressure cylinder, a turbine low-pressure cylinder and a generator set;
the water supply heat recovery system (3) comprises a high-pressure heat exchanger, a low-pressure heat exchanger, a deoxidizing water tank, a pre-pump and a condensate pump; the low-pressure heat exchanger is connected with the low-pressure cylinder; the high-pressure heat exchanger is connected with a high-pressure cylinder of the steam turbine; the deaeration water tank is respectively connected with the middle pressure cylinder, the low pressure heat exchanger, the pre-pump and the high pressure heat exchanger of the steam turbine;
the condensing system (4) comprises a cooling tower and a condenser; the condenser is respectively connected with the low-pressure cylinder of the steam turbine and the inlet of a condensate pump of the water supply heat recovery system (3); the method is characterized in that:
the direct steam system (2) comprises a direct steam solar heat collection field (20), a water pump (21), a liquid storage tank (22), a steam heat exchanger (23), a medium-temperature heat storage device (24), a water mixer (25) and a gas-liquid separator (26); an inlet of the direct steam solar heat collection field (20) is sequentially connected with a water pump (21), a liquid storage tank (22) and a water mixer (25) in series; the outlet of the direct steam solar heat collection field (20) is connected with the inlet of the gas-liquid separator (26); the gas phase outlet of the gas-liquid separator (26) is connected with the steam inlet of the superheater (15), and the liquid phase outlet of the gas-liquid separator (26) is connected with the inlet of the water mixer (25); the steam heat exchanger (23) is connected in parallel with a direct steam solar heat collection field (20); the inlet and the outlet of the medium-temperature heat storage device (24) are respectively connected with the heat storage working medium outlet and inlet of the steam heat exchanger (23);
the solar heat collection system for the molten salt comprises a molten salt heat collection system (1), wherein the molten salt heat collection system (1) comprises a trough type molten salt solar heat collection field (10), a high-temperature hot molten salt tank (18), a high Wen Lengrong molten salt tank (11), a molten salt pump (12), an expansion tank (13), a molten salt mixer (14), a superheater (15), a reheater (16) and a molten salt diverter (17); the inlet of the molten salt solar heat collection field (10) is sequentially connected with a molten salt pump (12), an expansion tank (13) and a molten salt mixer (14) in series, and a high Wen Lengrong molten salt tank (11) is connected in parallel on a pipeline between the inlet of the molten salt solar heat collection field (10) and the outlet of the molten salt pump (12) through a second valve (110) which is connected in series; the outlet of the molten salt solar heat collection field (10) is sequentially connected with a molten salt diverter (17), a superheating mechanism and a molten salt mixer (14) in series, wherein the superheating mechanism consists of a superheater (15) and a reheater (16) which are connected in parallel; a pipeline between the outlet of the molten salt solar heat collection field (10) and the inlet of the molten salt shunt (17) is connected in parallel with a high-temperature molten salt tank (18) through a first valve (19) connected in series, and the outlet of the high-temperature molten salt tank (18) is connected in series with a pump (111); the steam outlet of the superheater (15) is connected with the steam inlet of the high-pressure cylinder of the steam turbine; the steam outlet of the reheater (16) is connected with the steam inlet of the medium-pressure cylinder of the steam turbine;
the molten salt heat collecting system (1) has the function of a superheated steam section;
in operation, the preheating and evaporation processes of water in the system are completed in a direct steam solar heat collection field (20) in a direct steam system (2), and the superheating and reheating processes are completed in a superheater (15) and a reheater (16) of molten salt in a molten salt heat collection system (1).
2. The tank direct steam and molten salt combined thermal power generation system according to claim 1, wherein the medium temperature heat storage device (24) is a phase change energy storage device or a double tank molten salt energy storage device or a single tank inclined temperature layer energy storage device or a heat-development concrete heat storage device.
3. A combined direct steam and molten salt thermal power generation system according to claim 1, wherein the direct steam solar thermal collection field (20) comprises a direct steam trough thermal collection tube, a trough concentrator, a tracking mechanism, steam connection piping and pumps and valves.
4. A combined direct steam and molten salt thermal power generation system according to claim 1, wherein the molten salt solar thermal collection field (10) comprises a trough type molten salt thermal collection tube, a trough type condenser, a tracking mechanism, a molten salt connecting pipe and associated pumps and valves.
5. A tank direct steam and molten salt combined thermal power generation system according to claim 1, characterized in that the condensing system (4) is a water cooled condenser or an air cooled condenser.
6. The combined heat and power generation system of tank direct steam and molten salt as claimed in claim 1, wherein the low pressure cylinder of the steam turbine is formed by connecting two or more low pressure cylinders in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810228338.0A CN108561282B (en) | 2018-03-20 | 2018-03-20 | Trough type direct steam and molten salt combined thermal power generation system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810228338.0A CN108561282B (en) | 2018-03-20 | 2018-03-20 | Trough type direct steam and molten salt combined thermal power generation system |
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| Publication Number | Publication Date |
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| CN108561282A CN108561282A (en) | 2018-09-21 |
| CN108561282B true CN108561282B (en) | 2024-01-09 |
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| CN110701595B (en) * | 2019-10-23 | 2021-01-26 | 哈尔滨锅炉厂有限责任公司 | Two-stage superheating and reheating tower trough steam generation system |
| WO2021183424A1 (en) * | 2020-03-09 | 2021-09-16 | Nooter/Eriksen, Inc. | Renewable power generation system and method |
| CN111927724B (en) * | 2020-07-28 | 2022-07-05 | 华中科技大学 | Design method for heat collection field of partitioned trough type solar thermal power generation system |
| CN113587064B (en) * | 2021-07-12 | 2022-05-06 | 西安交通大学 | Mirror field starting and stopping system of photo-thermal power station and control method |
| CN113503195B (en) * | 2021-07-21 | 2022-12-23 | 上海海事大学 | Ship waste heat utilization cogeneration device and use method thereof |
| CN114739021A (en) * | 2022-04-14 | 2022-07-12 | 中国船舶重工集团新能源有限责任公司 | Groove type steam generation system |
| CN115822742A (en) * | 2022-10-24 | 2023-03-21 | 国电投重庆能源研究院有限公司 | Heat storage power generation system of accumulation bed |
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