CN113090950A - Heat collection-heat storage type oil conveying pipeline heating system based on photo-thermal conversion - Google Patents
Heat collection-heat storage type oil conveying pipeline heating system based on photo-thermal conversion Download PDFInfo
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- CN113090950A CN113090950A CN202110327445.0A CN202110327445A CN113090950A CN 113090950 A CN113090950 A CN 113090950A CN 202110327445 A CN202110327445 A CN 202110327445A CN 113090950 A CN113090950 A CN 113090950A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/16—Facilitating the conveyance of liquids or effecting the conveyance of viscous products by modification of their viscosity
- F17D1/18—Facilitating the conveyance of liquids or effecting the conveyance of viscous products by modification of their viscosity by heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S10/00—Solar heat collectors using working fluids
- F24S10/40—Solar heat collectors using working fluids in absorbing elements surrounded by transparent enclosures, e.g. evacuated solar collectors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S10/00—Solar heat collectors using working fluids
- F24S10/70—Solar heat collectors using working fluids the working fluids being conveyed through tubular absorbing conduits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S50/00—Arrangements for controlling solar heat collectors
- F24S50/20—Arrangements for controlling solar heat collectors for tracking
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S60/00—Arrangements for storing heat collected by solar heat collectors
- F24S60/30—Arrangements for storing heat collected by solar heat collectors storing heat in liquids
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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
- Y02E10/47—Mountings or tracking
Abstract
The invention discloses a heat collection-storage type oil conveying pipeline heating system based on photothermal conversion, which comprises a photothermal conversion unit, a liquid storage tank and a heating pipeline, wherein the photothermal conversion unit comprises a sunlight tracking controller and one or more photothermal conversion devices connected in parallel, each photothermal conversion device comprises a light gathering device and a heat collecting pipe, and the sunlight tracking controller is connected with the light gathering devices through cables; the heating pipeline is wound on the oil pipeline, the photothermal conversion device is connected with the liquid storage tank through the infusion pipeline, the heating pipeline is connected with the liquid storage tank, the heating pipeline is connected with the heat collecting pipe through the first branch pipeline, and meanwhile, the heating pipeline is also connected with the infusion pipeline through the second branch pipeline; the heat collecting pipe is internally provided with a photo-thermal conversion material, sunlight condensed by the condensing device is converted into heat energy to heat a heat exchange working medium in the heat collecting pipe, the heat exchange working medium flows into the liquid storage tank through the liquid conveying pipeline, then enters the heating pipeline, flows back to the heat collecting pipe or the liquid conveying pipeline after coming out of the heating pipeline, and circulation is formed.
Description
Technical Field
The invention relates to the technical field of oil pipeline transportation and solar energy conversion, in particular to a heat collection-storage type oil pipeline heating system based on photo-thermal conversion.
Background
At present, the transportation modes of crude petroleum mainly comprise pipeline transportation, waterway/railway/road transportation and the like. The pipeline transportation has the advantages of large transportation amount, quickness and convenience in transportation, convenience in scheduling, high safety and the like, and is one of the most ideal petroleum crude oil transportation modes.
The crude oil has high viscosity due to high contents of asphaltene, colloid and the like, so that the flow resistance of the crude oil in the transportation process is high. Generally speaking, the lower the temperature of crude oil, the higher the viscosity thereof, the greater the flow resistance accompanying the transportation process, and the higher the pumping work required to be consumed, which is particularly obvious in winter (especially in northern China). Since crude oil contains very little water, changes in temperature have a very large effect on changing the viscosity of the crude oil. Generally, when the temperature of crude oil is increased by about 10 ℃, the viscosity of the crude oil can be reduced by half. Therefore, the crude oil is heated in the processes of extraction and transportation, and common methods comprise steam heating, hot oil circulation and the like. In consideration of the currently generally adopted mode, the heating mode still costs the consumption of the existing energy sources, and the comprehensive economic benefit cannot be further improved. Although means for reducing the viscosity of crude oil, such as incorporation of thin oil, active agent, emulsifier, etc., have been proposed, the situation is further complicated by problems such as chemical contamination. Meanwhile, most oil pipelines are arranged on the ground, although the outer wall surface of the pipeline can be wrapped by a heat insulation layer, heat dissipated through convection and radiation heat exchange cannot be ignored, and the problem of maintaining the temperature of crude oil in the pipeline is also brought. Therefore, in the long-distance crude oil transportation process, the heating system is arranged in a segmented and point-divided manner, which is also one of necessary means for solving the problem of flow resistance.
As an inexhaustible renewable resource, the method directly heats media such as water, lava and the like by a solar photothermal conversion mode and is applied to various fields (H Ghasemi, G Ni, AM Marconnnet, et al. Nature Communications,2014,5: 4449; PFairly. IEEE Spectrum,2015,52: 11-12).
Disclosure of Invention
The concentrated solar heat collection-heat storage system is constructed based on the solar photo-thermal conversion effect and used for concentrated and distributed heating of the oil conveying pipeline, so that the transportation cost in the crude oil transportation process can be directly reduced, the consumption of additional energy sources is avoided, and the crude oil transportation efficiency and the comprehensive economic benefit of petrochemical enterprises are improved. Based on this, this application claims the following technical scheme:
a heat collection-storage type oil conveying pipeline heating system based on photo-thermal conversion comprises a photo-thermal conversion unit, a liquid storage tank and a heating pipeline, wherein the photo-thermal conversion unit comprises a sunlight tracking controller and one or more photo-thermal conversion devices connected in parallel, each photo-thermal conversion device comprises a light gathering device and a heat collecting pipe, and the sunlight tracking controller and the light gathering devices are connected through cables to control the light gathering devices to rotate along with the sunlight irradiation direction so as to gather sunlight and irradiate the sunlight on the heat collecting pipes;
the heating pipeline is wound on the oil pipeline, the photothermal conversion device is connected with the inlet of the liquid storage tank through the infusion pipeline, the inlet of the heating pipeline is connected with the outlet of the liquid storage tank, the outlet of the heating pipeline is connected with the inlet of the heat collecting pipe through the first branch pipeline, and meanwhile, the outlet of the heating pipeline is also connected with the infusion pipeline through the second branch pipeline; control valves are arranged on the infusion pipeline, the heating pipeline, the first branch pipeline and the second branch pipeline;
the heat collecting pipe is internally provided with a photo-thermal conversion material, sunlight condensed by the condensing device is converted into heat energy to heat a heat exchange working medium in the heat collecting pipe, the heat exchange working medium flows into the liquid storage tank through the liquid conveying pipeline, then enters the heating pipeline, flows back to the heat collecting pipe or the liquid conveying pipeline after coming out of the heating pipeline, and circulation is formed.
The oil pipeline heating system utilizes the sunlight condensing device to condense light and irradiates condensing light spots onto the heat collecting tube; the photo-thermal conversion material arranged in the heat collecting pipe is used for absorbing sunlight and converting the sunlight into heat energy to heat the heat exchange working medium; storing the heated heat exchange working medium by using a liquid storage tank; the heating pipeline arranged on the outer wall surface of the oil pipeline is used for heating the crude oil in the oil pipeline.
In the technical scheme, the heat collecting tube comprises an inner tube and an outer tube, a gap is reserved between the inner tube and the outer tube to serve as a vacuum heat insulating layer, and the inner tube and the outer tube are made of light-transmitting materials; the photothermal conversion material is arranged in the inner tube, the photothermal conversion material is a porous photothermal conversion material, the main body of the porous photothermal conversion material is a porous framework, a plurality of mutually communicated pore channels are arranged in the porous framework, photothermal conversion layers are arranged on the outer surface of the porous framework and the surfaces of the internal pore channels, and the photothermal conversion layers can absorb sunlight collected by the light gathering device and convert the sunlight into heat energy; the heat exchange working medium flows in the inner tube and flows through the pore canal of the porous framework to exchange heat with the photothermal conversion layer. The arrangement of the porous framework and the internal pore channels ensures the photo-thermal conversion effect; meanwhile, abundant pore channel structures in the porous framework can provide a path for the flow of the heat exchange working medium so as to exchange heat with the photo-thermal conversion layer, so that the heat exchange working medium is heated quickly and efficiently, and solar energy is stored in the heat exchange working medium in a heat energy mode.
Preferably, the heat exchange working medium is working medium distilled water, the inner tube and the outer tube are made of quartz glass, the photothermal conversion layer is made of black titanium dioxide, carbon nano tubes or activated carbon, and the porous framework is made of foam metal or porous carbon material, preferably foam titanium material. The working medium distilled water has good heat conductivity and larger specific heat capacity, the black titanium dioxide material has the advantages of wide spectral response and high photothermal conversion efficiency, and the foamed titanium material has a developed pore structure.
In the technical scheme, the light condensing device comprises a light condenser and an adjusting bracket, wherein the light condenser is fixed on the adjusting bracket and used for condensing sunlight to irradiate a heat collecting tube; the adjusting bracket is connected with the sunlight tracking controller through a signal control cable, and the sunlight tracking controller controls the adjusting bracket to rotate along with the change of the sunlight irradiation direction in the daytime, so that the sunlight is ensured to vertically irradiate the surface of the condenser.
Preferably, the condenser is a transmission condenser lens or a reflection condenser lens, the transmission condenser lens is arranged above the heat collecting tube, and the reflection condenser lens is arranged below the side of the heat collecting tube.
Further preferably, the condenser is a fresnel lens or a groove type condenser, the fresnel lens is arranged above the heat collecting tube, the groove type condenser is arranged below the side of the heat collecting tube, the fresnel lens and the groove type condenser can be directly purchased from the market, and the condensing effect is good.
Preferably, the top of the liquid storage tank is provided with a pressure relief port, the shell of the liquid storage tank is externally provided with a heat insulation layer, and an inlet of the liquid storage tank and an outlet of the liquid storage tank are respectively arranged at the upper part and the lower part of the liquid storage tank. The pressure relief port is arranged at the top of the shell, and pressure relief is carried out when the pressure in the shell exceeds a set value; the shell is made of corrosion-resistant and pressure-bearing materials such as stainless steel and the like; the outer wall of the shell is wrapped with an insulating layer; the heat exchange working medium flowing through the heat collecting pipe is heated through photo-thermal conversion and then stored in the liquid storage tank for storage; the storage volume of the heat exchange working medium in the liquid storage tank is far larger than the volume occupied by the circulation of the heat exchange working medium in the pipeline.
Preferably, the infusion pipeline is provided with a stop valve, the first branch pipeline and the second branch pipeline are both provided with electromagnetic valves, the pipeline connecting the outlet of the liquid storage tank and the inlet of the heating pipeline is provided with the stop valve and a circulating pump, the outlet of the heating pipeline is provided with a tee joint, the tee joint is connected with the first branch pipeline and the second branch pipeline, the pipeline connecting the outlet of the tee joint and the heating pipeline is provided with the stop valve, and the pipeline connecting the first branch pipeline and the heat collecting pipe is provided with the circulating pump. The stop valve is arranged to facilitate maintenance, one end of the tee joint is connected with a heat exchange working medium outlet of the heating pipeline through the stop valve, and the other two ends of the tee joint are respectively connected with the electromagnetic valves on the first branch pipeline and the second branch pipeline. When the system runs in daytime, the electromagnetic valve connected with the heat collecting pipe inlet circulating pump is opened, the electromagnetic valve on the second branch pipeline is closed, the heat exchange working medium flows through the heating pipeline and is cooled due to heating of the oil pipeline, and is heated again through heating of the heat collecting pipe and stored in the liquid storage tank; when the system operates at night, the electromagnetic valve on the second branch pipeline is opened, the electromagnetic valve on the first branch pipeline is closed, and at the moment, the high-temperature heat exchange working medium stored in the liquid storage tank flows through the heating pipeline to heat the oil pipeline.
Preferably, the infusion pipeline is made of stainless steel, and a heat insulation layer is arranged outside the infusion pipeline. The stainless steel is wear-resistant and corrosion-resistant, and the heat-insulating layer prevents heat loss.
Preferably, the gap between the heating pipeline and the oil pipeline is filled with silicone grease, the heating pipeline is made of copper, and an insulating layer is arranged outside the heating pipeline. The silicone grease has high thermal conductivity, can conduct heat better, the copper has high thermal conductivity and can bear pressure, and the heat insulation layer prevents heat loss.
The invention has the beneficial effects that: compared with the traditional technology which needs to consume a large amount of energy or chemicals, the invention combines the light-gathering solar energy and the photo-thermal composite material, stores the solar energy in a heat exchange working medium in a heat energy form through high-efficiency photo-thermal conversion, and is used for heating a crude oil transportation pipeline, thereby reducing the crude oil transportation cost and improving the transportation efficiency; the system can be arranged in a centralized manner, and can also be used for heating the crude oil transportation pipeline in a distributed manner in a segmented or fixed-point manner, has the advantages of low system energy consumption, simple structure and convenience in maintenance, and can be applied to various stages in the crude oil storage and transportation process.
Drawings
Fig. 1 is a schematic view of the structure of an oil pipeline heating system of the present invention.
Fig. 2 is a schematic view of the structure of the photothermal conversion device in fig. 1.
Fig. 3 is a schematic structural diagram of the heat collecting tube in fig. 1.
Fig. 4 is a schematic structural view of the porous photothermal conversion material in fig. 3.
FIG. 5 is a schematic view of the construction of the fluid reservoir tank of FIG. 1.
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, but the present invention is not limited thereby. 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.
Example 1
As shown in fig. 1, the heat collection-storage type oil pipeline heating system based on photothermal conversion mainly comprises a photothermal conversion unit, a liquid storage tank 6 and a heating pipeline 5. The photothermal conversion unit comprises a sunlight tracking controller 7 and one or more photothermal conversion devices connected in parallel, each photothermal conversion device comprises a light gathering device 1 and a heat collecting pipe 2, and the sunlight tracking controller 7 is connected with the light gathering devices 1 through cables to control the light gathering devices 1 to rotate along with the sunlight irradiation direction so as to gather and irradiate sunlight on the heat collecting pipes 2;
the heating pipeline 5 is wound on the oil pipeline 4, the photothermal conversion device is connected with an inlet 30 of the liquid storage tank 6 through the infusion pipeline 9, an inlet of the heating pipeline 5 is connected with an outlet 32 of the liquid storage tank 6, an outlet of the heating pipeline 5 is connected with an inlet of the heat collecting pipe 2 through a first branch pipeline 38, and meanwhile, an outlet of the heating pipeline 5 is also connected with the infusion pipeline 9 through a second branch pipeline 39; control valves are arranged on the infusion pipeline 9, the heating pipeline 5, the first branch pipeline 38 and the second branch pipeline 39;
the heat collecting pipe 2 is internally provided with a photo-thermal conversion material, sunlight condensed by the condensing device 1 is converted into heat energy to heat a heat exchange working medium 21 in the heat collecting pipe 2, the heat exchange working medium 21 flows into the liquid storage tank 6 through the liquid conveying pipeline 9, then enters the heating pipeline 5, flows back to the heat collecting pipe 2 or the liquid conveying pipeline 9 after flowing out of the heating pipeline 5, and circulation is formed.
In some embodiments, as shown in fig. 3 and 4, the heat collecting tube 2 is composed of an inner tube 25 and an outer tube 24, a gap is left between the inner tube 25 and the outer tube 24 to serve as a vacuum insulation layer 26, and both the inner tube 25 and the outer tube 24 are made of light-transmitting materials; the photothermal conversion material is arranged in the inner tube 25, the photothermal conversion material is a porous photothermal conversion material 22, the main body of the porous photothermal conversion material 22 is a porous framework 28, a plurality of mutually communicated pore channels 29 are arranged in the porous framework 28, photothermal conversion layers 27 are arranged on the outer surface of the porous framework 28 and the surfaces of the internal pore channels 29, and the photothermal conversion layers 27 can absorb sunlight collected by the light collecting device 1 and convert the sunlight into heat energy; the heat exchange working medium 21 flows in the inner tube 25 and flows through the pore channels 29 of the porous framework 28 to exchange heat with the photothermal conversion layer 27.
In some embodiments, the heat exchange working medium 21 is selected from distilled water, the inner tube 25 and the outer tube 24 are made of quartz glass, the photothermal conversion layer 27 is made of black titanium dioxide, carbon nanotubes or activated carbon, and the porous framework 28 is made of a foamed metal or a porous carbon material, preferably a foamed titanium material.
In some embodiments, as shown in fig. 2, the light gathering device 1 is composed of a light gathering device 17 and an adjusting bracket 18, the light gathering device 17 is fixed on the adjusting bracket 18, and gathers and irradiates sunlight onto the heat collecting tube 2; the adjusting bracket 18 is connected with the sunlight tracking controller 7 through a signal control cable 8, and the sunlight tracking controller 7 controls the adjusting bracket 18 to rotate along with the change of the sunlight irradiation direction in the daytime so as to ensure that the sunlight vertically irradiates the surface of the condenser 17. The condenser 17 is a transmission condenser lens or a reflection condenser lens, the transmission condenser lens is arranged above the heat collecting tube 2, the reflection condenser lens is arranged below the side of the heat collecting tube 2, and a fresnel lens or a groove condenser lens is preferred. The sunlight tracking controller can be directly obtained from commercial products on the market, is provided by different manufacturers on the market, is also called as a sunlight tracking device and the like, is a power device which can keep a solar cell panel or a condenser right opposite to the sun at any time and enable light rays to vertically irradiate the solar cell panel or the condenser at any time, and mainly has the function of maximizing the utilization rate of solar energy.
In some embodiments, as shown in FIG. 5, a pressure relief port 34 is provided at the top of the tank 6, an insulation layer 33 is provided outside the housing 31 of the tank 6, and the inlet 30 of the tank 6 and the outlet 32 of the tank 6 are provided at the upper and lower portions of the tank 6, respectively.
In some embodiments, as shown in fig. 1, a stop valve 12 is disposed on the infusion pipeline 9, electromagnetic valves 10 and 11 are disposed on the first branch pipeline 38 and the second branch pipeline 39, a stop valve 14 and a circulation pump 13 are disposed on the pipeline connecting the outlet 32 of the liquid storage tank 6 and the inlet of the heating pipeline 5, a tee 15 is disposed at the outlet of the heating pipeline 5, the tee 15 is connected with the first branch pipeline 38 and the second branch pipeline 39, a stop valve 16 is disposed on the pipeline connecting the tee 15 and the outlet of the heating pipeline 5, and a circulation pump 3 is disposed on the pipeline connecting the first branch pipeline 38 and the heat collecting pipe 2.
In some embodiments, the infusion pipeline 9 is made of stainless steel, and an insulating layer is arranged outside the infusion pipeline 9. The gap between the heating pipeline 5 and the oil pipeline 4 is filled with silicone grease, the heating pipeline 5 is made of copper, and a heat insulation layer is arranged outside the heating pipeline 5.
The heat collection-storage type oil conveying pipeline heating system based on photo-thermal conversion has the following working process: firstly, in order to inhibit the adverse effects of impurities and particles in the heat exchange working medium 21 on the heat exchange effect and the operation stability, a filter is adopted to treat the heat exchange working medium 21 and then the heat exchange working medium is injected into the liquid storage tank 6; and then, starting the circulating pumps 13 and 3 and the valves to introduce the heat exchange working medium 21 into the infusion pipeline 9, and continuously injecting the heat exchange working medium 21 into the liquid storage tank 6 until all the infusion pipelines 9 are filled with the heat exchange working medium 21 and the heat exchange working medium 21 in the liquid storage tank 6 reaches a specified liquid level height, which is generally about 80% of the total volume of the liquid storage tank. When the system runs in daytime, the circulating pump 3 is opened, the circulating pump 13 is opened, the electromagnetic valve 10 connected with the inlet circulating pump 3 of the heat collecting pipe 2 is opened, the electromagnetic valve 11 connected with the outlet of the heat collecting pipe 2 is closed, the heat exchange working medium 21 stored in the liquid storage tank 6 flows into the heating pipeline 5 to heat the oil pipeline 4, so that the temperature of crude oil is raised, the crude oil flows out from the outlet of the heating pipeline 5, and the crude oil is pumped into the heat collecting pipe 2 through the circulating pump 3 via the electromagnetic valve 10 to be heated; because the sunlight tracking controller 7 can enable the sunlight to vertically irradiate the surface of the light condensing device 1 all the time, the highest light intensity irradiation can be kept all the time, the high light-heat conversion efficiency can be realized after the light condensing and porous light-heat conversion materials are combined, the provided heat energy is far higher than the heat exchange quantity of a heating oil pipeline, and the redundant heat energy is stored in the heat exchange working medium 21 in the liquid storage tank 6 in a high-temperature mode. When the system runs at night, in order to reduce radiation loss when the high-temperature heat exchange working medium 21 flows through the heat collecting tube 2, at the moment, the circulating pump 3 is closed, the circulating pump 13 is opened, the electromagnetic valve 10 is closed, the electromagnetic valve 11 is opened, and the heat exchange working medium 21 does not flow through the heat collecting tube 2 and a pipeline in front of an inlet of the heat collecting tube 2; at the moment, the high-temperature heat exchange working medium 21 stored in the liquid storage tank 6 flows through the heating pipeline 5 to heat the oil pipeline 4; because the storage capacity of the heat exchange working medium 21 in the liquid storage tank 6 is far larger than the circulation capacity of the heat exchange working medium 21 in the heating pipeline 5 and the infusion pipeline 9, the oil pipeline can be continuously heated at night. The system combines a sunlight condenser, a heat collecting pipe internally provided with a photothermal conversion material and a sunlight tracking controller to realize efficient photothermal conversion, adopts a heat exchange working medium heated to a high temperature in a liquid storage tank to store heat, and on one hand, directly utilizes a sustainable energy source-solar crude oil transportation pipeline to heat, so that the crude oil transportation cost is reduced, and the crude oil transportation efficiency is improved; on the other hand, the oil pipeline can be heated under the conditions of no illumination and night due to the fact that the high-temperature heat exchange working medium liquid storage tank is combined to store surplus heat energy. The system can be arranged in a centralized way, and can also be arranged along the oil pipeline in a segmented or fixed-point way, so that the high-efficiency and low-energy-consumption crude oil transportation is realized.
Claims (10)
1. The utility model provides a thermal-arrest heat-retaining formula oil pipeline heating system based on light and heat conversion which characterized in that: the solar energy heat collection and conversion system comprises a light-heat conversion unit, a liquid storage tank (6) and a heating pipeline (5), wherein the light-heat conversion unit comprises a sunlight tracking controller (7) and one or more light-heat conversion devices connected in parallel, each light-heat conversion device comprises a light collection device (1) and a heat collection pipe (2), and the sunlight tracking controller (7) is connected with the light collection devices (1) through cables to control the light collection devices (1) to rotate along with the sunlight irradiation direction so as to collect and irradiate sunlight on the heat collection pipes (2);
the heating pipeline (5) is wound on the oil conveying pipeline (4), the photothermal conversion device is connected with an inlet (30) of the liquid storage tank (6) through the liquid conveying pipeline (9), an inlet of the heating pipeline (5) is connected with an outlet (32) of the liquid storage tank (6), an outlet of the heating pipeline (5) is connected with an inlet of the heat collecting pipe (2) through a first branch pipeline (38), and an outlet of the heating pipeline (5) is connected with the liquid conveying pipeline (9) through a second branch pipeline (39); control valves are arranged on the infusion pipeline (9), the heating pipeline (5), the first branch pipeline (38) and the second branch pipeline (39);
the solar-thermal conversion material is arranged in the heat collecting pipe (2), sunlight condensed by the light condensing device (1) is converted into heat energy to heat a heat exchange working medium in the heat collecting pipe (2), the heat exchange working medium flows into the liquid storage tank (6) through the liquid conveying pipeline (9), then enters the heating pipeline (5), and flows back to the heat collecting pipe (2) or the liquid conveying pipeline (9) after coming out of the heating pipeline (5), so that circulation is formed.
2. The heat collection-heat storage type oil pipeline heating system based on photothermal conversion as claimed in claim 1, wherein:
the heat collecting tube (2) comprises an inner tube (25) and an outer tube (24), a gap is reserved between the inner tube (25) and the outer tube (24) to serve as a vacuum heat-insulating layer (26), and the inner tube (25) and the outer tube (24) are made of light-transmitting materials; the photothermal conversion material is arranged in the inner tube (25), the photothermal conversion material is a porous photothermal conversion material (22), the main body of the porous photothermal conversion material (22) is a porous framework (28), a plurality of mutually communicated pore channels (29) are arranged in the porous framework (28), photothermal conversion layers (27) are arranged on the outer surface of the porous framework (28) and the surfaces of the internal pore channels (29), and the photothermal conversion layers (27) can absorb sunlight collected by the light collecting device (1) and convert the sunlight into heat energy; the heat exchange working medium flows in the inner pipe (25) and flows through the pore canal (29) of the porous framework (28) to exchange heat with the photothermal conversion layer (27).
3. The photothermal conversion based heat collection-heat storage type oil transportation pipeline heating system according to claim 2, wherein: the heat exchange working medium is selected from working medium distilled water, the inner tube (25) and the outer tube (24) are made of quartz glass, the photothermal conversion layer (27) is made of black titanium dioxide, carbon nano tubes or activated carbon, and the porous framework (28) is made of foam metal or porous carbon material, preferably foam titanium material.
4. The heat collection-heat storage type oil pipeline heating system based on photothermal conversion as claimed in claim 1, wherein: the light gathering device (1) comprises a light gathering device (17) and an adjusting support (18), wherein the light gathering device (17) is fixed on the adjusting support (18) and gathers sunlight to irradiate the heat collecting tube (2); the adjusting bracket (18) is connected with a sunlight tracking controller (7) through a signal control cable (8), and the sunlight tracking controller (7) controls the adjusting bracket (18) to rotate along with the change of the sunlight irradiation direction in the daytime so as to ensure that sunlight vertically irradiates the surface of the condenser (17).
5. The photothermal conversion based heat collection-heat storage type oil transportation pipeline heating system according to claim 4, wherein: condenser (17) is transmission-type condensing lens or reflection-type condensing lens, transmission-type condensing lens sets up the top at thermal-collecting tube (2), reflection-type condensing lens sets up the side below at thermal-collecting tube (2).
6. The photothermal conversion based heat collection-heat storage type oil transportation pipeline heating system according to claim 5, wherein: condenser (17) are fresnel lens or slot type condensing lens, fresnel lens sets up the top at thermal-collecting tube (2), the slot type condensing lens sets up the side below at thermal-collecting tube (2).
7. The heat collection-heat storage type oil pipeline heating system based on photothermal conversion as claimed in claim 1, wherein: the pressure relief port (34) is arranged at the top of the liquid storage tank (6), the heat insulation layer (33) is arranged outside the shell (31) of the liquid storage tank (6), and the inlet (30) of the liquid storage tank (6) and the outlet (32) of the liquid storage tank (6) are respectively arranged at the upper part and the lower part of the liquid storage tank (6).
8. The heat collection-heat storage type oil pipeline heating system based on photothermal conversion as claimed in claim 1, wherein: be provided with stop valve (12) on infusion pipeline (9), all be provided with solenoid valve (10,11) on first lateral conduit (38) and second lateral conduit (39), be provided with stop valve (14) and circulating pump (13) on the pipeline of the import of outlet (32) and heating pipeline (5) of connecting liquid storage pot (6), the export of heating pipeline (5) sets up tee bend (15), tee bend (15) are connected with first lateral conduit (38) and second lateral conduit (39), are provided with stop valve (16) on the pipeline of the export of connecting tee bend (15) and heating pipeline (5), are provided with circulating pump (3) on the pipeline of connecting first lateral conduit (38) and thermal-collecting tube (2).
9. The heat collection-heat storage type oil pipeline heating system based on photothermal conversion as claimed in claim 1, wherein: the infusion pipeline (9) is made of stainless steel, and a heat insulation layer is arranged outside the infusion pipeline (9).
10. The heat collection-heat storage type oil pipeline heating system based on photothermal conversion as claimed in claim 1, wherein: the silicone grease is filled in a gap between the heating pipeline (5) and the oil conveying pipeline (4), the heating pipeline (5) is made of copper, and a heat insulation layer is arranged outside the heating pipeline (5).
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