CN215808401U - Solar energy and natural gas complementary thermophotovoltaic steam generation system - Google Patents
Solar energy and natural gas complementary thermophotovoltaic steam generation system Download PDFInfo
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- CN215808401U CN215808401U CN202121649190.1U CN202121649190U CN215808401U CN 215808401 U CN215808401 U CN 215808401U CN 202121649190 U CN202121649190 U CN 202121649190U CN 215808401 U CN215808401 U CN 215808401U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model discloses a solar energy and natural gas complementary thermophotovoltaic steam generation system which comprises a thermophotovoltaic power supply system, a heat accumulating type solar heat collection system and a steam generation system. The solar heat collector collects solar radiation energy and converts the solar radiation energy into heat energy of heat conducting working media, and the heat conducting working media are heated by thermal photovoltaic waste heat flue gas and then circularly flow to the steam generator to be heated to supply water to generate steam. The thermal photovoltaic uses natural gas as fuel, the electric power generated by the thermal photovoltaic is used for maintaining the operation energy consumption of the whole system, and the thermal photovoltaic discharges smoke and heats the heat-conducting working medium, so that the orderly utilization of energy is realized. When the solar radiation quantity is insufficient, the supplementary combustion chamber is started to provide heat for the system, meanwhile, the auxiliary heat photovoltaic device is started to supplement the power demand, and the system can provide continuous and stable steam for a user to meet the heat supply demand.
Description
Technical Field
The utility model belongs to the field of thermal energy engineering and new energy, and particularly relates to a solar energy and gas natural gas complementary thermophotovoltaic steam generation heating system.
Background
As a medium-low temperature heat source, the most extensive utilization mode of solar energy is heat utilization, and mainly comprises solar heat collection and heat supply. However, solar energy is greatly affected by time domain, region and climate conditions, and the supply of solar energy is unstable, so that the complementation of solar energy and fuel energy through reasonable technical design is a key means for realizing the practical application of solar energy, fossil energy can be saved, and pollutant emission can be effectively controlled.
On the other hand, the traditional electric energy production mainly comprises various power cycle engines through thermal power conversion devices, and the devices all comprise rotating parts, have high noise and large volume, are difficult to miniaturize parameters, and are not beneficial to providing electric energy for the operation of a heating system in practical application.
Thermophotovoltaic is an emerging technology for directly converting thermal energy into electric energy, and mainly comprises a combustion chamber, an emitter, a filter and a photovoltaic cell. The heat energy generated by fuel combustion heats the radiator to generate high-temperature heat radiation, the high-temperature heat radiation is filtered by the filter to form usable wave bands, and the usable wave bands are returned to the non-convertible wave bands, so that the spectrum radiation suitable for the photovoltaic cell enters the cell to generate electric energy. The technology has no rotating parts and no noise. And the area of the thermophotovoltaic device can be adjusted according to the actual power requirement, and the parameter adjustment is more flexible. The thermophotovoltaic technology is introduced into a solar energy and fuel complementary heating system to serve as a source of electric energy for maintaining the operation of the system, and the system has practical innovation and important application value.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide a solar energy and natural gas complementary thermophotovoltaic steam generation system to realize all-weather heat supply.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model firstly provides a solar energy and natural gas complementary thermophotovoltaic steam generation system, which comprises a heat accumulating type solar heat collection system, a thermophotovoltaic power supply system and a steam generation system;
the heat accumulating type solar heat collecting unit comprises a solar heat collector, a mixed heat accumulator and a variable frequency pump which are sequentially connected through a medium pipeline to form a first medium circulation loop;
the thermophotovoltaic power supply system consists of a main thermophotovoltaic device and an auxiliary thermophotovoltaic device; the main thermophotovoltaic device and the auxiliary thermophotovoltaic device respectively comprise a thermophotovoltaic combustion chamber, a photovoltaic cell, a selective filter and a selective radiator; the selective radiator is arranged on the outer wall of the combustion chamber, the photovoltaic cell is arranged around the outer wall of the combustion chamber, the selective filter is arranged between the selective radiator and the photovoltaic cell, and the photovoltaic cell is connected with the storage battery;
the steam generation system comprises a mixed heat accumulator, a stage 1 heat exchanger, a stage 2 heat exchanger, a stage 3 heat exchanger, a steam generator, a circulating pump and a supplementary combustion chamber, wherein the mixed heat accumulator, the stage 1 heat exchanger, the stage 2 heat exchanger, the stage 3 heat exchanger, the steam generator and the circulating pump are sequentially connected through a medium pipeline to form a second medium circulation loop, and the first medium circulation loop and the second medium circulation loop exchange heat in the mixed heat accumulator; wherein the 1-stage heat exchanger is connected with the flue gas outlet of the main thermophotovoltaic device through a flue gas flow passage, the 2-stage heat exchanger is connected with the flue gas outlet of the auxiliary thermophotovoltaic device, the 3-stage heat exchanger is connected with the flue gas outlet of the supplementary combustion chamber, and the high-temperature heat conducting oil in the second medium circulation loop heats the water in the steam generator to generate steam.
Preferably, a combustor is arranged in the thermophotovoltaic combustion chamber, natural gas is used as fuel, and the combustion chamber and the combustor are made of 316 stainless steel.
Preferably, the thermal photovoltaic combustion chamber is of a hexagonal prism structure, the outer wall of the thermal photovoltaic combustion chamber is covered with the selective radiators, the photovoltaic cells are arranged in parallel around the hexagonal prism wall surface of the combustion chamber, and the selective filters are arranged in parallel in front of the surface of the cells.
Preferably, the selective filter is a periodic photonic crystal film.
Preferably, the photovoltaic cell is a GaSb photovoltaic cell.
Preferably, the storage batteries comprise two groups, and the two groups of storage batteries can be independently charged and discharged.
Preferably, the 1-stage heat exchanger, the 2-stage heat exchanger and the 3-stage heat exchanger are all shell-and-tube heat exchangers, and the flue gas and the heat-conducting working medium perform countercurrent heat exchange.
Preferably, the solar heat collector is a trough parabolic mirror collector.
The utility model comprehensively utilizes the solar energy and the chemical energy of the natural gas, and can obviously reduce the consumption of fuel and reduce the emission of pollutants compared with a system which independently depends on the combustion of the natural gas. Compared with a system independently depending on solar energy, the system can effectively ensure the continuity of energy input of the system and realize the continuous and stable operation of the system.
Compared with the traditional thermal power generation technology, the thermophotovoltaic device has no rotating device, low noise and simple structure, is beneficial to the miniaturization of the system and provides technical support for the practical application of the system.
The utility model is provided with the main and auxiliary two-stage thermal photovoltaic devices, and can meet the power consumption requirements of the system under different conditions. In the utility model, the thermal photovoltaic residual flue gas continuously heats the heat-conducting medium, so that the cogeneration effect is formed, and the principle of energy gradient utilization is met.
Drawings
FIG. 1 is a diagram of a solar complementary thermophotovoltaic steam generation system;
fig. 2 is a schematic diagram of a thermophotovoltaic device.
In the figure: the system comprises a groove type solar heat collector 1, a hybrid heat accumulator 2, a variable frequency pump 3, a main thermal photovoltaic device 4, an auxiliary thermal photovoltaic device 5, a supplementary combustion chamber 6, a heat exchanger 7 of No. 1, a heat exchanger 8 of No. 2, a heat exchanger 9 of No. 3, a steam generator 10, a circulating pump 11, feed water 12, steam 13 and fuel and air 14; a thermophotovoltaic combustion chamber 15; a selective radiator 16, a selective filter 17; a photovoltaic cell 18; a cooling system 19.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and 2, the present invention firstly provides a solar energy and natural gas complementary thermophotovoltaic steam generation system, which comprises a heat accumulating type solar heat collection system, a thermophotovoltaic power supply system and a steam generation system;
the heat accumulating type solar heat collecting unit comprises a solar heat collector 1, a mixed heat accumulator 2 and a variable frequency pump 3 which are sequentially connected through a medium pipeline to form a first medium circulation loop;
the thermophotovoltaic power supply system consists of a main thermophotovoltaic device 4 and an auxiliary thermophotovoltaic device 5; the main thermophotovoltaic device and the auxiliary thermophotovoltaic device both comprise a thermophotovoltaic combustion chamber 15, a photovoltaic cell 18, a selectivity filter 17 and a selectivity radiator 16; the outer wall of the thermal photovoltaic combustion chamber 15 is provided with a selective radiator, the photovoltaic cells are arranged around the outer wall of the combustion chamber, a selective filter is arranged between the selective radiator and the photovoltaic cells, and the photovoltaic cells are connected with the storage battery;
the steam generation system comprises a mixed heat accumulator 1, a 1-stage heat exchanger 7, a 2-stage heat exchanger 8, a 3-stage heat exchanger 9, a steam generator 10, a circulating pump 11 and a supplementary combustion chamber 6 which are sequentially connected through medium pipelines to form a second medium circulation loop, wherein the first medium circulation loop and the second medium circulation loop exchange heat in the mixed heat accumulator; wherein the 1-stage heat exchanger is connected with the flue gas outlet of the main thermophotovoltaic device through a flue gas flow passage, the 2-stage heat exchanger is connected with the flue gas outlet of the auxiliary thermophotovoltaic device, the 3-stage heat exchanger is connected with the flue gas outlet of the supplementary combustion chamber, and the high-temperature heat conducting oil in the second medium circulation loop heats the water in the steam generator to generate steam.
In an embodiment of the present invention, the solar thermal collector 1 is a trough type solar thermal collector, which receives and collects solar radiation energy, and reflects the solar radiation energy to an evacuated collector tube located on a focal line, the evacuated collector tube absorbs the solar radiation energy and converts the solar radiation energy into heat energy of a heat conducting oil working medium in the evacuated collector tube, the heat conducting medium is Thermo60 heat conducting oil, the medium-high temperature heat conducting oil flows into the hybrid heat accumulator through a 001 inlet to increase the heat of the heat conducting oil therein, and the medium-temperature heat conducting oil is pumped out from a 002 outlet at the other end of the hybrid heat accumulator through a variable frequency pump and re-enters the solar thermal collector to form a cycle.
The medium temperature heat conduction working medium in the hybrid heat reservoir 2 sequentially enters the heat exchanger No. 1, the heat exchanger No. 2 and the heat exchanger No. 3 through an outlet No. 004, and the circulating flow is heated to the steam generator to heat the water supply through the waste heat and smoke of the main thermophotovoltaic device, so that steam with certain temperature and pressure is generated.
The thermophotovoltaic combustion chamber 15 is of a hexagonal prism structure, the outer wall of the thermophotovoltaic combustion chamber is covered and installed with a selective radiator 16, and the selective filter 17 and the photovoltaic cell 18 are arranged in parallel with the wall surface surrounding the combustion chamber. The combustion chamber is made of high-temperature-resistant 316 stainless steel, silicon carbide is coated inside the combustion chamber to improve the emissivity, the wall surface of the combustion chamber is parallel to a photovoltaic cell, the photovoltaic cell is a gallium antimonide cell with the cutoff wavelength of 1.8 mu m, the matching parts of the photovoltaic cell further comprise a storage battery, a charge and discharge controller and other electricity storage devices, and the electricity is produced to maintain the operation of a circulating pump, a heat collector and a control system of the system. The selective radiator is a rare earth oxide radiator or a metamaterial radiator; the selective filter is a one-dimensional periodic silicon/silicon dioxide photonic crystal film type filter. By means of the adjusting action of the selective radiator and the selective filter, spectral radiation with a wavelength of less than 1.8 μm can be selected. The battery cooling channel is of a parallel plate structure, and the turbulence fins are arranged in the channel to improve the heat exchange strength. The cooling channel is connected with a cooling medium circulating system through a pipeline, the cooling medium is water, and the cooling water channel is designed as a coiled pipe and is arranged on the back of the battery to keep the temperature of the battery between 20 and 30 ℃, so that high efficiency is kept.
In a specific embodiment, when the sunlight is sufficient, the temperature of the heat-conducting working medium entering the hybrid heat accumulator in the first medium circulation loop is controlled to be 150-; when the illumination is insufficient, the temperature of the heat conducting working medium at the inlet of the hybrid heat accumulator is low, and when the temperature of the heat conducting working medium is detected to be less than 150 ℃, the output power of the variable frequency pump is adjusted to be minimum.
In the second medium circulation loop, when the outlet temperature of the hybrid heat accumulator is lower than 200 ℃, the main thermophotovoltaic device is started to provide heat, and when the outlet temperature of the hybrid heat accumulator is higher than 230 ℃, the main thermophotovoltaic device is closed.
When the temperature of the heat-conducting working medium at the inlet of the steam generator is lower than 200 ℃, the heat-conducting working medium is at night or the solar radiation quantity is insufficient, at the moment, if the electric quantity of the storage battery is higher than 50%, the supplementary combustion chamber is started to provide heat for the second medium circulation loop, if the electric quantity of the storage battery is not higher than 50%, the auxiliary thermal photovoltaic device is started, the auxiliary thermal photovoltaic device provides heat and simultaneously supplements the electric power of the storage battery, and when the electric quantity of the storage battery reaches 90%, the auxiliary thermal photovoltaic device is closed, and the supplementary combustion chamber is started to provide heat for the second medium circulation loop. Under the operation, the whole thermophotovoltaic heating system can provide stable heat energy, and the use of external power can be reduced or even completely avoided as much as possible, so that the possibility of self-maintenance is achieved.
When the steam generator works, the temperature of the heat-conducting working medium entering the steam generator is not lower than 200 ℃ by adjusting the thermophotovoltaic power supply system and the supplementary combustion chamber, when the temperature of the heat-conducting working medium at the inlet of the steam generator is monitored to reach 220 ℃, the fuel gas flow can be reduced or the fuel gas flow can be closed according to the priority sequence of the supplementary combustion chamber, the auxiliary thermophotovoltaic device and the main thermophotovoltaic device, so that the temperature of hot oil at the inlet of the steam generator is finally kept between 200 ℃ and 230 ℃, and the steam generator generates steam at 100 ℃.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the utility model.
Claims (8)
1. A solar energy and natural gas complementary thermophotovoltaic steam generation system is characterized by comprising a heat accumulating type solar heat collection system, a thermophotovoltaic power supply system and a steam generation system;
the heat accumulating type solar heat collecting unit comprises a solar heat collector, a mixed heat accumulator and a variable frequency pump which are sequentially connected through a medium pipeline to form a first medium circulation loop;
the thermal photovoltaic power supply system comprises a main thermal photovoltaic device and an auxiliary thermal photovoltaic device; the main thermophotovoltaic device and the auxiliary thermophotovoltaic device respectively comprise a thermophotovoltaic combustion chamber, a photovoltaic cell, a selective filter and a selective radiator; the outer wall of the combustion chamber is provided with a selective radiator, the photovoltaic cell is arranged around the outer wall of the combustion chamber, the selective filter is arranged between the selective radiator and the photovoltaic cell, and the photovoltaic cell is connected with the storage battery.
The steam generation system comprises a mixed heat accumulator, a stage 1 heat exchanger, a stage 2 heat exchanger, a stage 3 heat exchanger, a steam generator, a circulating pump and a supplementary combustion chamber, wherein the mixed heat accumulator, the stage 1 heat exchanger, the stage 2 heat exchanger, the stage 3 heat exchanger, the steam generator and the circulating pump are sequentially connected through a medium pipeline to form a second medium circulation loop, and the first medium circulation loop and the second medium circulation loop exchange heat in the mixed heat accumulator; wherein the 1-stage heat exchanger is connected with the flue gas outlet of the main thermophotovoltaic device through a flue gas flow passage, the 2-stage heat exchanger is connected with the flue gas outlet of the auxiliary thermophotovoltaic device, the 3-stage heat exchanger is connected with the flue gas outlet of the supplementary combustion chamber, and the high-temperature heat conducting oil in the second medium circulation loop heats the water in the steam generator to generate steam.
2. The solar-natural gas complementary thermophotovoltaic steam generation system according to claim 1, wherein: the thermophotovoltaic combustion chamber is internally provided with a combustor, natural gas is used as fuel, and the combustion chamber and the combustor are made of 316 stainless steel.
3. The solar-natural gas complementary thermophotovoltaic steam generation system according to claim 1, wherein: the hot photovoltaic combustion chamber is of a hexagonal prism structure, the outer wall of the hot photovoltaic combustion chamber covers the selective radiator, the photovoltaic cells are arranged in parallel around the hexagonal prism wall surface of the combustion chamber, and the selective filter is arranged in parallel in front of the surface of the cell.
4. The solar-natural gas complementary thermophotovoltaic vapor generation system according to claim 1 or 3, wherein the selective filter is selected from periodic photonic crystal films.
5. The solar-natural gas complementary thermophotovoltaic vapor generation system according to claim 1 or 3, wherein the photovoltaic cells are GaSb photovoltaic cells.
6. The solar-natural gas complementary thermophotovoltaic steam generation system according to claim 1, wherein said storage batteries comprise two groups, and wherein said two groups of storage batteries are independently rechargeable and dischargeable.
7. The solar energy and natural gas complementary thermophotovoltaic steam generation system according to claim 1, wherein the 1-stage heat exchanger, the 2-stage heat exchanger and the 3-stage heat exchanger are all shell-and-tube heat exchangers, and flue gas and heat conducting working media perform countercurrent heat exchange.
8. The solar-natural gas complementary thermophotovoltaic steam generation system according to claim 1, wherein said solar collector is a parabolic trough collector.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121649190.1U CN215808401U (en) | 2021-07-20 | 2021-07-20 | Solar energy and natural gas complementary thermophotovoltaic steam generation system |
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| CN202121649190.1U CN215808401U (en) | 2021-07-20 | 2021-07-20 | Solar energy and natural gas complementary thermophotovoltaic steam generation system |
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