CN115854565A - All-weather photo-thermal composite compressed air energy storage system and method - Google Patents
All-weather photo-thermal composite compressed air energy storage system and method Download PDFInfo
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Abstract
The invention discloses an all-weather photo-thermal composite compressed air energy storage system and a method, which belong to the technical field of energy storage, and comprise an expander, an oil-gas heat exchanger, a gas storage, a heat regeneration system and a processor; the heat regenerative system comprises a valley electricity heating loop and a photo-thermal heat collection loop; the method comprises the following steps: starting a photo-thermal heat collection device and a photo-thermal circulating pump in the photo-thermal heat collection loop in the photo-thermal heat collection time; starting a low-temperature circulating pump and a high-temperature circulating pump in the valley electric heating loop at the valley electric heating time, and heating and storing heat conduction oil to a high-temperature oil tank after the heat conduction oil is heated by a valley electric heater; when power generation and heat release are carried out, heat conduction oil flows out of the high-temperature oil tank, the oil-gas inlet heat exchanger heats compressed air in the gas storage, and the heat conduction oil after heat exchange flows into the low-temperature oil tank; and the light-heat oil tank heat conduction oil supplements heat to the low-temperature oil tank. The invention achieves the purpose of high-efficiency heat storage by utilizing a heating mode of combined operation of photo-thermal heating and valley heating, meets the operation requirement of compressed air energy storage, and has the advantages of good economical efficiency, energy saving and environmental protection.
Description
Technical Field
The invention relates to the technical field of energy storage, in particular to an all-weather photo-thermal composite compressed air energy storage system and method.
Background
The compressed air energy storage power generation system is one of the lowest carbon and environment-friendly novel energy storage modes, but the heat loss of the compression process and the expansion process is mainly influenced on the energy storage efficiency of the compressed air, so that the compressed air energy storage power station is provided with a heat conduction oil heat storage system.
The heat conduction oil heat storage technology is a technology which is developed gradually by storing heat energy such as solar photo-heat, terrestrial heat, industrial waste heat, low-grade waste heat and the like by taking a heat storage material as a medium and releasing the heat energy when needed, and tries to solve the problem caused by mismatching of heat energy supply in time, space or strength and the requirement, so that the energy utilization rate of the whole system is improved to the maximum extent.
In order to reduce carbon emission as much as possible, some heat storage systems of the compressed air energy storage system adopt a solar photo-thermal collection system to collect solar heat as a heat source of expansion heat, the solar energy has the inexhaustible characteristic and is safe and environment-friendly, but because the sunlight heat energy density is low and the change fluctuation is large, the heat required by the system cannot be stored in time in cloudy days or in the continuous insufficient sunlight period, so that the frequent insufficient heat storage amount is caused, and the normal operation of the compressed air energy storage power station is influenced.
Disclosure of Invention
The invention aims to provide an all-weather photo-thermal composite compressed air energy storage system and method, which achieve the aim of efficient heat storage by utilizing a heating mode of combined operation of photo-thermal heating and valley heating, meet the requirement of compressed air energy storage operation, realize off-peak operation, realize the complementation of two energy storage modes, have good economy, save energy and protect environment.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
an all-weather photo-thermal composite compressed air energy storage system comprises an expander, an oil-gas heat exchanger, a gas storage, a heat regenerative system and a processor; the low-temperature compressed air in the gas storage is changed into high-temperature compressed air through the oil-gas heat exchanger and is supplied to the expansion machine; the heat regenerative system comprises a valley electricity heating loop and a photo-thermal heat collection loop;
the valley electric heating loop comprises a low-temperature oil tank connected with an oil outlet of the oil-gas heat exchanger through a first low-temperature oil guide pipeline and a high-temperature oil tank connected with the low-temperature oil tank through a valley electric heating pipeline; the high-temperature oil tank is connected with an oil inlet of the oil-gas heat exchanger through a high-temperature oil guide pipeline; the valley electric heating pipeline is provided with a low-temperature circulating pump and a valley electric heater; a high-temperature circulating pump is arranged on the high-temperature oil guide pipeline;
the photo-thermal heat collection loop comprises a photo-thermal oil tank connected with an oil outlet of the oil-gas heat exchanger through a second low-temperature oil guide pipeline and a photo-thermal heat collection pipeline provided with a photo-thermal heat collection device and a photo-thermal circulating pump; the photo-thermal oil tank is connected with the photo-thermal heating pipeline to form a first heating loop; the low-temperature oil tank is connected with the photo-thermal heating pipeline to form a second heating loop; a low-temperature oil tank heat-compensating valve is arranged on the second heating loop; the photo-thermal oil tank is connected with the low-temperature oil tank through a heat-compensating oil-conducting pipeline; and the heat supplementing heat conduction oil pipeline is provided with a heat supplementing pump.
The technical scheme of the invention is further improved as follows: oil temperature sensors are respectively arranged at oil outlets of the low-temperature oil tank, the high-temperature oil tank and the low-temperature oil tank.
The technical scheme of the invention is further improved as follows: and an oil temperature sensor is arranged in the photo-thermal oil tank.
The technical scheme of the invention is further improved as follows: the processor respectively collects the oil temperature in the low-temperature oil tank, the high-temperature oil tank and the photo-thermal oil tank and the oil temperature at the oil outlet of the low-temperature oil tank, and controls the heating power of the valley electric heater and the opening and closing of the low-temperature circulating pump, the high-temperature circulating pump, the photo-thermal circulating pump and the heat supplementing pump.
An all-weather photo-thermal composite compressed air energy storage method comprises the following steps:
s1, starting a photo-thermal heat collection device and a photo-thermal circulating pump in a photo-thermal heat collection loop in the photo-thermal heat collection time, and respectively feeding heat conduction oil in a low Wen Youguan and a photo-thermal oil tank into the photo-thermal heat collection device for heating;
s2, starting a low-temperature circulating pump and a high-temperature circulating pump in the valley electric heating loop in the valley electric heating time, automatically calculating and controlling the heating power of the valley electric heater by a processor according to the temperature T3 of heat conducting oil at an oil outlet of the low-temperature oil tank, heating the heat conducting oil to the temperature T4 by the valley electric heater, storing the heat conducting oil to the high-temperature oil tank, and stopping heating by the valley electric heater;
s3, when power generation and heat release are carried out, the heat conduction oil flows out of the high-temperature oil tank, the oil and gas inlet heat exchanger heats compressed air in the gas storage, the temperature of air entering the expansion machine is increased, and the power generation capacity of the system is increased; the heat conducting oil after heat exchange flows into a low-temperature oil tank;
and S4, when power generation and heat release are carried out, the light and heat oil tank heat conduction oil supplements heat to the low-temperature oil tank.
The technical scheme of the invention is further improved as follows: the S1 comprises the following steps:
s1.1, the mass of heat conducting oil stored in the low-temperature oil tank is M1, and when the low-temperature oil tank is circularly heated to the temperature T1 through the photo-thermal heat collection device, a heat compensation valve of the low-temperature oil tank is closed;
s1.2 the photo-thermal oil tank stores heat conducting oil with the mass M2, and the heat conducting oil is circularly heated to the temperature T2 through the photo-thermal heat collecting device and stored in the photo-thermal oil tank.
The technical scheme of the invention is further improved as follows: in S1, the photo-thermal heat collection time is 8-00.
The technical scheme of the invention is further improved as follows: in S2, the valley electric heating time is 8 hours, and the time is 23-00.
The technical scheme of the invention is further improved as follows: in S3, the power generation and heat release time is 7-23, and the scheduling requirements are that the time for power generation and heat release is continuous for four hours.
The technical scheme of the invention is further improved as follows: s4, the method comprises the following steps:
s4.1, when power generation and heat release are started, when the oil temperature T2 in the photo-thermal oil tank is larger than the oil temperature T3 in the low-temperature oil tank, the controller starts a heat supplementing pump, and heat conduction oil in the photo-thermal oil tank enters the low-temperature oil tank for heat supplementation and participates in circulation;
and S4.2, circularly heating the heat conduction oil which flows back to the photo-thermal oil tank by the photo-thermal heat collection device.
Due to the adoption of the technical scheme, the invention has the technical progress that:
1. according to the invention, by arranging the valley electric heating loop and the photo-thermal heat collection loop and utilizing the heating mode of combined operation of photo-thermal heating and valley heating, the purpose of efficient heat storage is achieved, the energy storage operation requirement of compressed air is met, peak staggering operation is realized, the complementation of two energy storage modes is realized, and the energy-saving and environment-friendly compressed air energy storage system is good in economy and energy-saving.
2. The invention is convenient to implement and is suitable for all compressed air energy storage and heat storage systems.
Drawings
FIG. 1 is a schematic view of an all-weather photo-thermal composite compressed air energy storage system of the present invention;
the system comprises an expansion machine 1, an oil-gas heat exchanger 2, a gas storage, a low-temperature oil tank 4, a high-temperature oil tank 5, a photo-thermal oil tank 6, a low-temperature circulating pump 7, a valley electric heater 8, a high-temperature circulating pump 9, a photo-thermal heat collection device 10, a photo-thermal circulating pump 11, a photo-thermal circulating pump 12 and a heat supplementing pump.
Detailed Description
The invention is described in further detail below with reference to the following figures and examples:
in the description of the present invention, it is to be understood that the terms "first", "second" … … are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" … … may explicitly or implicitly include at least one such feature.
As shown in fig. 1, an all-weather photo-thermal composite compressed air energy storage system comprises an expander 1, an oil-gas heat exchanger 2, a gas storage 3, a heat recovery system and a processor; the low-temperature compressed air in the gas storage 3 is changed into high-temperature compressed air through the oil-gas heat exchanger 2 and is supplied to the expansion machine 1; the oil-gas heat exchanger 2 is connected in series in a regenerative system; the heat regenerative system comprises a valley electricity heating loop and a photo-thermal heat collection loop;
the valley electric heating loop comprises a low-temperature oil tank 4 connected with an oil outlet of the oil-gas heat exchanger 2 through a first low-temperature oil guide pipeline and a high-temperature oil tank 5 connected with the low-temperature oil tank 4 through a valley electric heating pipeline; the high-temperature oil tank 5 is connected with an oil inlet of the oil-gas heat exchanger 2 through a high-temperature oil guide pipeline; a low-temperature circulating pump 7 and a valley electric heater 8 are arranged on the valley electric heating pipeline; a high-temperature circulating pump 9 is arranged on the high-temperature oil guide pipeline; oil temperature sensors are respectively arranged in the low-temperature oil tank 4, the high-temperature oil tank 5 and the oil outlets of the low-temperature oil tank 4.
The photo-thermal heat collection loop comprises a photo-thermal oil tank 6 connected with an oil outlet of the oil-gas heat exchanger 2 through a second low-temperature oil guide pipeline and a photo-thermal heat collection pipeline provided with a photo-thermal heat collection device 10 and a photo-thermal circulating pump 11; the photo-thermal oil tank 6 is connected with the photo-thermal heating pipeline to form a first heating loop; the low-temperature oil tank 4 is connected with the photo-thermal heating pipeline to form a second heating loop; a low-temperature oil tank heat-compensating valve is arranged on the second heating loop; the photo-thermal oil tank 6 is connected with the low-temperature oil tank 4 through a heat-compensating oil-conducting pipeline; a heat supplementing pump 12 is arranged on the heat supplementing oil guide pipeline; an oil temperature sensor is arranged in the photo-thermal oil tank 6;
the processor respectively collects the oil temperature in the low-temperature oil tank 4, the high-temperature oil tank 5 and the photo-thermal oil tank 6 and the oil temperature at the oil outlet of the low-temperature oil tank 4, and controls the heating power of the valley electric heater 8 and the opening and closing of the low-temperature circulating pump 7, the high-temperature circulating pump 9, the photo-thermal circulating pump 11 and the heat supplementing pump 12.
The number of the low-temperature circulating pump 7, the high-temperature circulating pump 9 and the photo-thermal circulating pump 11 is two, and the two circulating pumps are respectively arranged on two branches in parallel.
An all-weather photo-thermal composite compressed air energy storage method comprises the following steps:
s1, starting a photo-thermal heat collection device 10 and a photo-thermal circulating pump 11 in a photo-thermal heat collection loop in the photo-thermal heat collection time, wherein the photo-thermal heat collection time is 8-00, and heat conduction oil in a low-temperature oil tank 4 and a photo-thermal oil tank 6 respectively enters the photo-thermal heat collection device 10 for heating, and the method specifically comprises the following steps:
s1.1, the mass of heat conducting oil stored in the low-temperature oil tank 4 is M1, and the circulation heating is finished when the temperature is T1 through the photo-thermal heat collection device 10;
s1.2 the photo-thermal oil tank 6 stores heat conducting oil with the mass M2, and the heat conducting oil is circularly heated to the temperature T2 through the photo-thermal heat collecting device 10 and stored in the photo-thermal oil tank 6.
S2, starting a low-temperature circulating pump 7 and a high-temperature circulating pump 9 in the valley electric heating loop in the valley electric heating time, automatically calculating and controlling the heating power of a valley electric heater 8 by a processor according to the temperature T3 of heat conducting oil at an oil outlet of the low-temperature oil tank 4, heating the heat conducting oil by the valley electric heater 8 to the temperature T4, storing the heat conducting oil to the high-temperature oil tank 5, stopping heating the valley electric heater 8, and keeping the valley electric heating time at 8 hours, 23-00.
S3, when power generation and heat release are carried out, the heat conduction oil flows out of the high-temperature oil tank 5, the oil-gas inlet heat exchanger 2 heats compressed air in the gas storage 3, the temperature of air entering the expansion machine 1 is increased, and the power generation capacity of a system is increased; the heat transfer oil after heat exchange flows into the low-temperature oil tank 4, and the power generation and heat release time is any continuous four hours required by the dispatching in the range from 7 to 23.
S4, the light and heat oil tank 6 conducts heat oil to supplement heat to the low-temperature oil tank 4;
s4.1, when power generation and heat release are started, and the oil temperature T2 in the photo-thermal oil tank 6 is larger than the oil temperature T3 in the low-temperature oil tank 4, the controller starts the heat supplementing pump 12, and heat conduction oil in the photo-thermal oil tank 6 enters the low-temperature oil tank 4 for heat supplementation and participates in circulation;
and S4.2, circularly heating the heat conduction oil which flows back to the photo-thermal oil tank 6 through the photo-thermal heat collection device 10.
The mass of the heat conducting oil stored in the low-temperature oil tank 4 is M1, and the oil quantity meeting the operation requirement is obtained; the photo-thermal oil tank 6 has the mass M2 of heat conducting oil stored, and meets the heat collection capacity of the photo-thermal heat collection device 10; the low-temperature oil tank 4 is circularly heated to the temperature T1 through the photo-thermal heat collection device 10, and the heat collection capability of the photo-thermal heat collection device 10 is met; the photo-thermal oil tank 6 is circularly heated to the temperature T2 through the photo-thermal heat collection device 10, the chemical performance of heat conduction oil is met, and the maximum energy storage is achieved on the premise that the stable performance of the heat conduction oil is ensured.
Because the area of the photo-thermal heat collecting device 10 is limited, the T1 and the T2 are required to be arranged according to the limited area of the photo-thermal heat collecting device 10, so that the energy storage efficiency of compressed air is optimal, the valley electric heater power is reduced by heating the heat conducting oil in the photo-thermal oil tank 6 in advance, energy is saved, and the heat storage efficiency is further improved.
Examples
The method comprises the following steps that S1, a photo-thermal heat collection device 10 and a photo-thermal circulating pump 11 in a photo-thermal heat collection loop are started one day in advance by combining with the operation characteristics of a compressed air energy storage project, the photo-thermal heat collection time is 8-00, 700t of heat conduction oil is stored in a low-temperature oil tank 4 and a photo-thermal oil tank 6 together and respectively enters a groove type photo-thermal heat collection device to be heated, 550t of heat conduction oil meeting the operation requirement is stored in the low-temperature oil tank 4, and the circulation heating is finished when the temperature reaches about 160 ℃ through the groove type photo-thermal heat collection device; 150t of small-flow heat conduction oil in the photo-thermal oil tank 6 fully utilizes photo-thermal heat collection for continuous heating, and the part of heat conduction oil is heated to 300 ℃ and stored in the photo-thermal oil tank.
S2, flowing 550t of heat conduction oil (160 ℃) out of the low-temperature oil tank 4, circularly heating the heat conduction oil by the valley electric heater 8 until the heat conduction oil is heated to about 250 ℃, meeting the heat exchange requirement with air at the inlet of the turbine, storing the heat conduction oil to the high-temperature oil tank 5, withdrawing the valley electric heater 8 from heating, and keeping the valley electric heating time at 8 hours, namely, 23-00.
S3, the heat conduction oil (250 ℃) flows out of the high-temperature oil tank 5, and enters the air heat exchanger 2 to heat compressed air, so that the temperature of the air entering the high-temperature compression expansion machine 1 is increased, and the power generation capacity of a system is increased; the heat conducting oil after heat exchange is about 120 ℃, flows into the low-temperature oil tank 4, and generates electricity and releases heat for any continuous four hours required by the scheduling in the period of 7-00.
S4, the small-flow heat conduction oil in the photo-thermal oil tank 6 fully utilizes photo-thermal heat collection for continuous heating, when power generation and heat release are started, when the oil temperature T2 in the photo-thermal oil tank 6 is larger than the oil temperature T3 in the low-temperature oil tank 4, the heat supplementing pump 12 is started, the running temperature of the low-temperature heat conduction oil is quickly increased, the valley electric heater power is favorably reduced, energy conservation is realized, and the heat storage efficiency is further improved.
In conclusion, the invention achieves the purpose of high-efficiency heat storage by utilizing the heating mode of combined operation of photo-thermal heating and valley heating, meets the requirement of compressed air energy storage operation, realizes peak staggering operation, realizes the complementation of the two energy storage modes, and has good economical efficiency, energy saving and environmental protection.
Claims (10)
1. The utility model provides an all-weather light and heat compound compressed air energy storage system which characterized in that: the system comprises an expander (1), an oil-gas heat exchanger (2), a gas storage (3), a heat recovery system and a processor; the low-temperature compressed air in the gas storage (3) is changed into high-temperature compressed air through the oil-gas heat exchanger (2) and is supplied to the expansion machine (1); the heat regenerative system comprises a valley electricity heating loop and a photo-thermal heat collection loop;
the valley electric heating loop comprises a low-temperature oil tank (4) connected with an oil outlet of the oil-gas heat exchanger (2) through a first low-temperature oil guide pipeline and a high-temperature oil tank (5) connected with the low-temperature oil tank (4) through a valley electric heating pipeline; the high-temperature oil tank (5) is connected with an oil inlet of the oil-gas heat exchanger (2) through a high-temperature oil guide pipeline; a low-temperature circulating pump (7) and a valley electric heater (8) are arranged on the valley electric heating pipeline; a high-temperature circulating pump (9) is arranged on the high-temperature oil guide pipeline;
the photo-thermal heat collection loop comprises a photo-thermal oil tank (6) connected with an oil outlet of the oil-gas heat exchanger (2) through a second low-temperature oil guide pipeline and a photo-thermal heat collection pipeline provided with a photo-thermal heat collection device (10) and a photo-thermal circulating pump (11); the photo-thermal oil tank (6) is connected with the photo-thermal heating pipeline to form a first heating loop; the low-temperature oil tank (4) is connected with the photo-thermal heating pipeline to form a second heating loop; a low-temperature oil tank heat-compensating valve is arranged on the second heating loop; the photo-thermal oil tank (6) is connected with the low-temperature oil tank (4) through a heat-compensating oil-conducting pipeline; and a heat supplementing pump (12) is arranged on the heat supplementing oil guide pipeline.
2. The all-weather photo-thermal composite compressed air energy storage system of claim 1, wherein: oil temperature sensors are respectively arranged in the low-temperature oil tank (4), the high-temperature oil tank (5) and the oil outlet of the low-temperature oil tank (4).
3. The all-weather photo-thermal composite compressed air energy storage system of claim 1, wherein: an oil temperature sensor is arranged in the photo-thermal oil tank (6).
4. The all-weather photo-thermal composite compressed air energy storage system according to any one of claims 2 or 3, wherein: the processor respectively collects the oil temperature in the low-temperature oil tank (4), the high-temperature oil tank (5) and the photo-thermal oil tank (6) and the oil temperature at an oil outlet of the low-temperature oil tank (4), and controls the heating power of the valley electric heater (8) and the opening and closing of the low-temperature circulating pump (7), the high-temperature circulating pump (9), the photo-thermal circulating pump (11) and the heat supplementing pump (12).
5. An all-weather photo-thermal composite compressed air energy storage method is characterized in that: the all-weather photo-thermal composite compressed air energy storage system as claimed in any one of claims 1 to 4, comprising the following steps:
s1, starting a photo-thermal heat collection device (10) and a photo-thermal circulating pump (11) in a photo-thermal heat collection loop in the photo-thermal heat collection time, and respectively feeding heat conduction oil in a low-temperature oil tank (4) and a photo-thermal oil tank (6) into the photo-thermal heat collection device (10) for heating;
s2, starting a low-temperature circulating pump (7) and a high-temperature circulating pump (9) in the valley electric heating loop at the valley electric heating time, automatically calculating and controlling the heating power of a valley electric heater (8) by a processor according to the temperature T3 of heat conducting oil at an oil outlet of the low-temperature oil tank (4), heating the heat conducting oil to the temperature T4 after the heat conducting oil is heated by the valley electric heater (8), storing the heat conducting oil to the high-temperature oil tank (5), and stopping heating the valley electric heater (8);
s3, when power generation and heat release are carried out, the heat conduction oil flows out of the high-temperature oil tank (5), the oil-gas inlet heat exchanger (2) heats compressed air in the gas storage (3), the temperature of air entering the expansion machine (1) is increased, and the power generation capacity of a system is increased; the heat conduction oil after heat exchange flows into the low-temperature oil tank (4);
and S4, when power generation and heat release are carried out, the heat conducting oil of the photo-thermal oil tank (6) supplements heat for the low-temperature oil tank (4).
6. The all-weather photo-thermal composite compressed air energy storage method according to claim 5, characterized in that: the S1 comprises the following steps:
s1.1, the mass of heat conducting oil stored in the low-temperature oil tank (4) is M1, and when the low-temperature oil tank is circularly heated to the temperature T1 through the photo-thermal heat collection device (10), a heat compensation valve of the low-temperature oil tank is closed;
s1.2, the photo-thermal oil tank (6) stores heat conducting oil with the mass M2, and the heat conducting oil is circularly heated to the temperature T2 through the photo-thermal heat collection device (10) and stored in the photo-thermal oil tank (6).
7. The all-weather photo-thermal composite compressed air energy storage method according to claim 5, characterized in that: in S1, the photo-thermal heat collection time is 8-00.
8. The all-weather photo-thermal composite compressed air energy storage method according to claim 5, characterized in that: in S2, the valley electric heating time is 8 hours, and the time is 23-00.
9. The all-weather photo-thermal composite compressed air energy storage method according to claim 5, characterized in that: in S3, the power generation and heat release time is 7-23, and the scheduling requirements are that the time for power generation and heat release is continuous for four hours.
10. The all-weather photo-thermal composite compressed air energy storage method according to claim 5, characterized in that: s4, the method comprises the following steps:
s4.1, when power generation and heat release are started, when the oil temperature T2 in the photo-thermal oil tank (6) is larger than the oil temperature T3 in the low-temperature oil tank (4), the controller starts the heat supplementing pump (12), and heat conduction oil in the photo-thermal oil tank (6) enters the low-temperature oil tank (4) for heat supplementation and participates in circulation;
and S4.2, circularly heating the heat conduction oil which flows back to the photo-thermal oil tank (6) through the photo-thermal heat collection device (10).
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| CN110057115A (en) * | 2019-04-25 | 2019-07-26 | 上海锅炉厂有限公司 | A kind of light, electricity complementary trough photovoltaic power generation system and its operation method |
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2023
- 2023-02-03 CN CN202310052757.4A patent/CN115854565B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE3241925A1 (en) * | 1982-11-12 | 1984-05-17 | Hermann Ing.(grad.) 8121 Antdorf Kirchmayer | Device for the conversion of solar energy into heat |
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| CN106016767A (en) * | 2016-05-26 | 2016-10-12 | 上海光热实业有限公司 | Gradient solar heat energy utilization system with energy storage function and use method thereof |
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