CN212378576U - High-temperature solid particle heat exchange system - Google Patents
High-temperature solid particle heat exchange system Download PDFInfo
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- CN212378576U CN212378576U CN202021255572.1U CN202021255572U CN212378576U CN 212378576 U CN212378576 U CN 212378576U CN 202021255572 U CN202021255572 U CN 202021255572U CN 212378576 U CN212378576 U CN 212378576U
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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
Abstract
The utility model discloses a high temperature solid particle heat transfer system to gaseous middle heat transfer medium as high temperature granule and power cycle working medium for heat transfer between high temperature granule and the power cycle working medium effectively solves technical problem such as granule heat exchanger heat exchange efficiency is low, heat transfer surface wearing and tearing are serious. The utility model discloses a pneumatic conveying retrieves the leakage granule of granule promotion in-process to gas heat recovery to the transport provides the solution, and the cryogenic particles who leaks adopts pneumatic conveyor to send into the cryogenic particles storage tank among granule hoist system or other transportation systems, the cryogenic particles storage tank is the malleation storage tank, and after pneumatic conveyor's conveying gas constantly input, the jar internal formation malleation prevents effectively that the heat transfer gas among the granule gas heat exchanger from flowing backwards and getting into the cryogenic particles storage tank, and through the pressure of the balanced cryogenic particles storage tank of check valve, will carry the leading-in granule gas heat exchanger of gas, retrieves the waste heat of cryogenic particles storage tank, the effectual granule heat loss that has reduced.
Description
Technical Field
The utility model belongs to solar thermal energy power generation field, concretely relates to be used for high temperature solid particle heat transfer system.
Background
In recent years, with the increasing emphasis on fossil energy crisis and environmental problems, solar thermal power generation technology has attracted much attention. The tower type photo-thermal power generation technology has the advantages of high light concentration ratio, high power circulation parameters, high efficiency of a circulation system and the like, and has great development potential. However, the tower type photothermal technology has huge investment cost, and the application development of the tower type photothermal technology is severely limited. Improving the power generation efficiency of a power station is one of the important measures for reducing the power generation cost. The heat absorption and storage medium adopted by the prior tower type solar thermal power generation is binary nitrate (60 percent NaNO)3+40％KNO3) However, the applicable temperature is limited below 600 ℃, and the improvement of the power cycle efficiency is severely limited.
The solid particle heat collecting technology is a novel solar thermal power generation technology, the heat collecting temperature can reach 1000 ℃, the price is low, and the solid particle heat collecting technology is an ideal high-temperature heat collecting and storing medium. Particulate heat absorbers and heat exchangers are the major technical difficulties for this technology application. The research on heat absorbers is widely carried out at home and abroad, but the research on particle heat exchangers is still less. The particle heat exchanger mainly has the function of transferring heat of high-temperature particles to a rear-end power cycle working medium, and the working medium comprises supercritical carbon dioxide, water/steam and the like. At present, research on plate heat exchangers, tubular heat exchangers and fluidized bed heat exchangers is carried out abroad mainly by using a United states Sangdi laboratory as a representative. The research on the tubular heat exchanger is carried out by the national western-An transportation university, and the research on the fluidized bed heat exchanger is carried out by the Zhejiang university. Generally speaking, the existing heat exchanger research basically focuses on heat exchange of particles directly contacting with a circulating working medium.
However, the direct contact heat exchange of high-temperature particles can cause serious abrasion of the heat exchange surface, and risks such as local rupture and tube explosion of the heat exchange surface occur. In addition, direct contact heat exchange of the particles is limited by solid heat conduction, thermal contact resistance of a heat exchange surface and the like, and the heat exchange coefficient is low.
In addition, leakage inevitably occurs during the flow of the particles, especially during the lifting. The most common leaky particle recovery systems used today include screw lifts, bucket lifts, and pneumatic conveying. The former two have strict requirements on space arrangement and are not suitable for conveying a small amount of particles. The pneumatic conveying is easy to arrange, the recovery efficiency is high, but the heat loss of the particles can be caused.
Therefore, in order to solve the above problems, a heat exchange system for high-temperature solid particles needs to be designed and developed, and the heat loss generated by pneumatic transmission can be effectively recovered.
SUMMERY OF THE UTILITY MODEL
The utility model provides a tower solar thermal energy electricity generation is with high temperature solid particle heat transfer system for heat transfer between high temperature solid particle and the power cycle working medium effectively solves technical problem such as granule heat exchanger heat exchange efficiency is low, heat transfer surface wearing and tearing are serious.
Additionally, the utility model discloses a pneumatic conveying retrieves the granule and promotes the leakage granule of in-process to gas heat recovery to carrying provides the solution, the effectual granule heat loss that has reduced.
The utility model provides a high temperature solid particle heat transfer system to gaseous middle heat transfer medium as high temperature solid particle and power cycle working medium, gaseous not with high temperature solid particle takes place the reaction, and with high temperature solid particle can not decompose during the heat transfer, high temperature solid particle heat transfer system includes:
a blower for pressurizing and feeding the cold gas into the particle/gas heat exchanger;
the gas preheater is used for recovering the waste heat of the hot gas after heat exchange in the circulating working medium heater to preheat the cold gas;
the particle/gas heat exchanger provides a place for direct contact heat exchange between the high-temperature solid particles and the preheated cold gas;
the air distribution plate is positioned at the bottom of the particle/gas heat exchanger and used for uniformly feeding the preheated cold gas;
a cycle fluid heater for heating the power cycle fluid using the hot gas heated in the particle/gas heat exchanger;
the particle flow regulating valve is positioned at a particle outlet below the particle/gas heat exchanger and used for regulating the outlet flow of the solid particles after heat exchange so as to regulate the temperature of hot gas and further regulate the temperature of the power cycle working medium;
and the particle shut-off valve is positioned at a particle feed inlet above the particle/gas heat exchanger, is used for shutting off the passage of the high-temperature solid particles into the particle/gas heat exchanger under the extreme or dangerous working condition, and is used for regulating the flow of the high-temperature solid particles.
The high-temperature solid particle heat exchange system preferably comprises the following high-temperature particle heat exchange passages: the method comprises the following steps that a blower sends cold gas into a gas preheater to recover waste heat of hot gas so as to preheat the cold gas, then the gas is evenly sent into a particle/gas heat exchanger through a wind distribution plate at the bottom of the particle/gas heat exchanger, the gas and high-temperature solid particles in the particle/gas heat exchanger are contacted for heat exchange, the hot gas obtained after heat exchange enters a heat exchange air channel, the hot gas heats a power cycle working medium to a design temperature through a cycle working medium heater, then the waste heat of the hot gas is recovered through the gas preheater and heats the cold gas, and the hot gas is discharged or recovered after the heat exchange of the.
The high-temperature solid particle heat exchange system also preferably comprises a low-temperature particle storage tank, wherein the temperature of the high-temperature solid particles is reduced after heat exchange in the particle/gas heat exchanger, and the high-temperature solid particles enter the low-temperature particle storage tank through the particle flow regulating valve.
The high-temperature solid particle heat exchange system also preferably adopts a pneumatic conveying device to recover leaked particles, the pneumatic conveying device mainly comprises a gas compressor which is used for providing compressed gas, the compressed gas is used as conveying gas of the leaked particles, and the conveying gas conveys the leaked particles to the low-temperature particle storage tank.
The high-temperature solid particle heat exchange system also preferably comprises a heat recovery mechanism, wherein the heat recovery mechanism comprises the gas compressor and a check valve; the gas compressor conveys leaked particles to the low-temperature particle storage tank, and the heat of the leaked particles is synchronously recycled to the low-temperature particle storage tank by the conveying gas; the check valve is used for balancing the pressure of the cryogenic particle storage tank, when the conveying gas continuously enters the cryogenic particle storage tank to cause the pressure in the cryogenic particle storage tank to rise, the gas of the cryogenic particle storage tank flows into the particle/gas heat exchanger through the check valve, and the heat of the cryogenic particles in the cryogenic particle storage tank is synchronously recycled to the particle/gas heat exchanger.
The arrangement of the check valve ensures that the low-temperature particle storage tank keeps certain pressure on one hand, and prevents heat exchange gas in the particle/gas heat exchanger from flowing back to enter the low-temperature particle storage tank; in another aspect, a transport gas can be introduced into the particle/gas heat exchanger to recover heat.
The high-temperature solid particle heat exchange system also preferably comprises a particle circulation passage: low temperature granule in the low temperature granule storage tank sends into granule heat absorption system through granule hoisting device, absorbs solar energy at granule heat absorption system and falls into the high temperature granule storage tank after to the design temperature to feed the storehouse and get into granule/gas heat exchanger through the bottom of high temperature granule storage tank, utilize granule flow control valve regulation granule falling speed of granule/gas heat exchanger below, the granule falls into the low temperature granule storage tank at last.
The heat exchange system for the high-temperature solid particles is also preferred, and the gas is selected from air, nitrogen or inert gas.
The high-temperature solid particle heat exchange system is also preferably characterized in that a plurality of ventilation structures allowing gas to pass through are arranged on the air distribution plate.
The high-temperature solid particle heat exchange system is also preferable, and the ventilation structure is a ventilation hole.
The utility model discloses owing to adopt above technical scheme, make it compare with prior art and have following advantage and positive effect:
1. the utility model adopts the gas which is not reacted and decomposed as the intermediate heat exchange medium, the gas firstly collects the heat by the direct convection heat exchange with the high-temperature solid particles, and then exchanges the heat with the power cycle working medium to release the heat to heat the power cycle working medium, thereby avoiding the problem of low heat exchange efficiency caused by the particle heat conduction when the particle/power cycle working medium directly exchanges the heat, and increasing the heat exchange efficiency of the system; in addition, the gas heat exchange technology is mature, and the realization of high-temperature and high-pressure parameters of the power cycle working medium is facilitated.
2. The utility model discloses a gaseous heat transfer medium in the middle of as, avoided the particulate matter to cycle medium heater erode wear, prolonged heat transfer system's life and reliability.
3. The utility model discloses be provided with gas heater, can further retrieve the waste heat of hot gas, realize thermal step utilization, guarantee energy utilization efficiency.
4. The utility model adopts pneumatic conveying to recover leaked particles, the arrangement is simple and compact, and the particle recovery efficiency is high; in addition, the low-temperature particle storage tank adopts a positive-pressure storage tank, the leaked particle heat is recovered by recovering particle conveying gas, and pressure balance is carried out by adopting a check valve, so that on one hand, the check valve can prevent heat exchange gas in the particle/gas heat exchanger from flowing back to enter the low-temperature particle storage tank; on the other hand, heat of leaked particles is introduced into the low-temperature particle storage tank and then into the particle/gas heat exchanger through the particle conveying gas to recover the heat.
Of course, it is not necessary for any particular product to achieve all of the above-described advantages at the same time.
Drawings
Fig. 1 is a schematic view of a high-temperature solid particle heat exchange system for solar thermal power generation according to an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 showing in detail the high temperature particle heat exchange path of the high temperature solid particle heat exchange system.
In the figure: the system comprises a blower 1, a gas preheater 2, a circulating working medium heater 3, a particle/gas heat exchanger 4, an air distribution plate 5, a particle flow regulating valve 6, a particle shutoff valve 7, a particle heat absorption system 8, a high-temperature particle storage tank 9, a low-temperature particle storage tank 10, a leakage particle storage bin 11, a particle lifting system 12, a gas compressor 13 and a check valve 14.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Examples
The heat exchange system for high-temperature solid particles provided by the present invention is described in detail with reference to fig. 1.
The embodiment provides a high temperature solid particle heat transfer system to gas is as the middle heat transfer medium of high temperature solid particle and power cycle working medium, high temperature solid particle heat transfer system divide according to circulation path and contained 3 systems: particle circulation system, high temperature granule heat transfer system and leak granule recovery system.
Wherein, the particle circulating system comprises a solar particle heat absorption system 8, a high-temperature particle storage tank 9, a particle/gas heat exchanger 4, a low-temperature particle storage tank 10 and a particle lifting system 12. Wherein, high temperature granule storage tank 9 is located the below of solar energy granule heat absorption system 8, and granule/gas heat exchanger 4 is located the below of high temperature granule storage tank 9, and low temperature granule storage tank 10 is located the below of granule/gas heat exchanger 4, and granule lift system 12 communicates the below of low temperature granule storage tank 10 and the top of solar energy granule heat absorption system 8. Particle passages are formed among the solar particle heat absorption system 8, the high-temperature particle storage tank 9, the particle/gas heat exchanger 4 and the low-temperature particle storage tank 10. Wherein the gas as the intermediate heat exchange medium does not react with the high-temperature solid particles and does not decompose during heat exchange with the high-temperature solid particles, and preferably, the gas as the intermediate heat exchange medium may be air, nitrogen or an inert gas.
Referring to fig. 2, the high-temperature particle heat exchange system includes a blower 1, a gas preheater 2, a circulating medium heater 3, a particle/gas heat exchanger 4, an air distribution plate 5, a particle flow control valve 6, and a particle shutoff valve 7. Wherein, the air distribution plate 5 is arranged below the inside of the particle/gas heat exchanger 4, and a plurality of ventilation structures which allow gas to pass through are arranged on the air distribution plate 5, and the ventilation structures can be ventilation holes. The blower 1, the gas preheater 2, the particle/gas heat exchanger 4, the circulating medium heater 3 and the gas preheater 2 form a gas inlet and outlet passage. The particle flow regulating valve 6 is positioned at the joint of the lower discharge port of the particle/gas heat exchanger 4 and the low-temperature particle storage tank 10, and the particle shutoff valve 7 is positioned at the joint of the high-temperature particle storage tank 9 and the upper particle feed port of the particle/gas heat exchanger 4.
The leaking particle recovery system comprises a gas compressor 13, a leaking particle bin 11, a check valve 14. Wherein, the leaking particle storage 11 is located below the low temperature particle storage tank 10, and the gas compressor 13 is used for providing high pressure gas to send the leaking particles in the leaking particle storage 11 to the low temperature particle storage tank 10. A check valve 14 is provided between the particle/gas heat exchanger 4 and the cryogenic particle storage tank 10, and the check valve 14 serves as a passage for gas in the cryogenic particle storage tank 10 to enter the particle/gas heat exchanger 4 and can prevent gas in the particle/gas heat exchanger 4 from flowing backward into the cryogenic particle storage tank 10. Wherein the gas delivered by the gas compressor 13 does not react with the high-temperature solid particles and does not decompose during the heat exchange with the high-temperature solid particles, and the gas delivered by the gas compressor may be the same as the gas as the intermediate medium or different, and if the gas delivered by the gas compressor and the gas as the intermediate medium are different gases, it is preferable to ensure that the gas compressor and the gas as the intermediate medium do not react. Preferably, the gas delivered by the gas compressor may be air, nitrogen or an inert gas.
One specific embodiment of the operation of the high-temperature solid particle heat exchange system of the embodiment mainly comprises the following three passages:
a particle circulation path: the low-temperature particles in the low-temperature particle storage tank 10 are sent to the particle heat absorption system 8 through the particle lifting system 12, and the particles absorb solar energy, become high-temperature solid particles after being heated to the design temperature, and fall into the high-temperature particle storage tank 9 by means of gravity for storage. When the rear-end power cycle is started and the power cycle working medium starts to circulate, the particle shutoff valve 7 is opened, high-temperature solid particles enter the particle/gas heat exchanger 4 by virtue of gravity to exchange heat with gas, the heat exchanged hot gas exchanges heat with the power cycle working medium at the position of the cycle working medium heater 3 to heat the power cycle working medium, the particle flow is adjusted by the particle flow adjusting valve 6, and the temperature of the cycle working medium outlet of the cycle working medium heater 3 is ensured. The high-temperature solid particles and the gas are fully exchanged heat in the particle/gas heat exchanger 4, and then are changed into low-temperature particles and fall into the low-temperature particle storage tank 10 for storage.
High temperature particle heat exchange path (see figure 2 for details): after the gas is conveyed by the blower 1 and preheated by the gas preheater 2, the gas is uniformly conveyed into the particle/gas heat exchanger 4 through the air distribution plate 5 at the bottom of the particle/gas heat exchanger 4, the hot gas heated by direct contact of high-temperature solid particles enters the tail end waste heat recovery system through the air duct, the tail end waste heat recovery system mainly comprises a circulating working medium heater 3 and a gas preheater 2, the hot gas exchanges heat with a power circulating working medium to heat the power circulating working medium at the position of the circulating working medium heater 3, the hot gas exchanges heat with the cold gas conveyed by the blower 1 at the position of the gas preheater 2 to complete the preheating of the input cold gas, and the heat of the hot gas is recovered in a gradient manner. The utility model discloses a high temperature solid particle heat transfer system has avoided high temperature solid particle and cycle medium heater 3's heat-transfer surface direct contact to carry out the heat transfer owing to adopted gas as middle heat transfer medium, can effectively prevent the erosion and wear of heat-transfer surface, and has also improved heat exchange efficiency through gaseous convection heat transfer's mode.
Leak particle recovery path: particles leaked during lifting or transporting of the particles are collected through the leaked particle storage 11, and the leaked particles are sent to the low-temperature particle storage tank 10 for storage through high-pressure gas generated by the gas compressor 13. The low-temperature particle storage tank 10 is a positive pressure storage tank, maintains the internal pressure of the tank by the high-pressure gas to be delivered, and is communicated with the particle/gas heat exchanger 4 in a one-way manner through a check valve 14, and the internal positive pressure and the check valve 14 can prevent the gas in the particle/gas heat exchanger 4 from flowing backwards. When the pressure in the low-temperature particle storage tank 10 exceeds the pressure of the air box at the inlet of the air distribution plate 5, the gas in the low-temperature particle storage tank 10 enters the particle/gas heat exchanger 4 through the check valve 14, so that the heat of the particles in the low-temperature storage tank is recovered, and the heat loss generated by pneumatic conveying of the particles is reduced.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, the changes are still within the scope of the present invention if they fall within the scope of the claims and their equivalents.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention. The present invention is limited only by the claims and their full scope and equivalents.
Claims (9)
1. A high-temperature solid particle heat exchange system, wherein a gas is used as an intermediate heat exchange medium between high-temperature solid particles and a power cycle fluid, the gas does not react with the high-temperature solid particles and does not decompose when exchanging heat with the high-temperature solid particles, the high-temperature solid particle heat exchange system comprising:
a blower for pressurizing and feeding the cold gas into the particle/gas heat exchanger;
the gas preheater is used for recovering the waste heat of the hot gas after heat exchange in the circulating working medium heater to preheat the cold gas;
the particle/gas heat exchanger provides a place for direct contact heat exchange between the high-temperature solid particles and the preheated cold gas;
the air distribution plate is positioned at the bottom of the particle/gas heat exchanger and used for uniformly feeding the preheated cold gas;
a cycle fluid heater for heating the power cycle fluid using the hot gas heated in the particle/gas heat exchanger;
the particle flow regulating valve is positioned at a particle outlet below the particle/gas heat exchanger and used for regulating the outlet flow of the solid particles after heat exchange so as to regulate the temperature of hot gas and further regulate the temperature of the power cycle working medium;
and the particle shut-off valve is positioned at a particle feed inlet above the particle/gas heat exchanger, is used for shutting off the passage of the high-temperature solid particles into the particle/gas heat exchanger under the extreme or dangerous working condition, and is used for regulating the flow of the high-temperature solid particles.
2. The high temperature solid particulate heat exchange system of claim 1, wherein the high temperature solid particulate heat exchange system comprises the following high temperature particulate heat exchange paths: the method comprises the following steps that a blower sends cold gas into a gas preheater to recover waste heat of hot gas so as to preheat the cold gas, then the gas is evenly sent into a particle/gas heat exchanger through a wind distribution plate at the bottom of the particle/gas heat exchanger, the gas and high-temperature solid particles in the particle/gas heat exchanger are contacted for heat exchange, the hot gas obtained after heat exchange enters a heat exchange air channel, the hot gas heats a power cycle working medium to a design temperature through a cycle working medium heater, then the waste heat of the hot gas is recovered through the gas preheater and heats the cold gas, and the hot gas is discharged or recovered after the heat exchange of the.
3. The system for exchanging heat between high temperature solid particles of claim 1, further comprising a low temperature particle storage tank, wherein the high temperature solid particles are reduced in temperature after heat exchange in the particle/gas heat exchanger and enter the low temperature particle storage tank through the particle flow regulating valve.
4. The hot solids heat exchange system of claim 3 further comprising a pneumatic conveyance means for recovering the leaking particles, the pneumatic conveyance means comprising essentially a gas compressor for providing compressed gas as a conveyance gas for the leaking particles, the conveyance gas feeding the leaking particles from a leaking particles bin below the cryogenic particles storage tank to the cryogenic particles storage tank.
5. The high temperature solid particulate heat exchange system of claim 4, further comprising a heat recovery mechanism comprising the gas compressor and a check valve; the gas compressor conveys leaked particles to the low-temperature particle storage tank, and the heat of the leaked particles is synchronously recycled to the low-temperature particle storage tank by the conveying gas; the check valve is used for balancing the pressure of the low-temperature particle storage tank, when the conveying gas continuously enters the low-temperature particle storage tank to cause the pressure in the tank to rise, the gas of the low-temperature particle storage tank flows into the particle/gas heat exchanger through the check valve, and the heat of the particles in the low-temperature particle storage tank is synchronously recycled to the particle/gas heat exchanger.
6. The high temperature solid particulate heat exchange system of claim 1, further comprising a particulate circulation path: low temperature granule in the low temperature granule storage tank sends into granule heat absorption system through granule hoisting device, absorbs solar energy at granule heat absorption system and falls into the high temperature granule storage tank after to the design temperature to feed the storehouse and get into granule/gas heat exchanger through the bottom of high temperature granule storage tank, utilize granule flow control valve regulation granule falling speed of granule/gas heat exchanger below, the granule falls into the low temperature granule storage tank at last.
7. A high temperature solid particle heat exchange system as claimed in claim 1 wherein the gas is selected from air, nitrogen or an inert gas.
8. The high temperature solid particle heat exchange system of claim 1 wherein the air distribution plate is provided with a plurality of ventilation structures that allow gas to pass through.
9. The high temperature solid particle heat exchange system of claim 8, wherein the vent structure is a vent.
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| CN202021255572.1U CN212378576U (en) | 2020-07-01 | 2020-07-01 | High-temperature solid particle heat exchange system |
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