Solar heat absorption system of integral heat pipe heat exchanger

Abstract

An integral type heat pipe heat exchanger solar heat absorption system comprises a heat absorption tower, a heat transmission pipeline, a heat transmission working medium, a working medium driving device and a heat storage device. The system utilizes a fused salt working medium to carry out heat transfer, and a heat absorber works by utilizing a heat pipe principle; through comprehensive utilization of a heat pipe principle and various solar radiation heat transfer enhanced technical measures and an integral heat pipe heat exchanger structure suitable for mounting of a heat absorption tower structure, the internal space of the heat absorption tower is fully utilized, so that the size or volume of the heat absorption tower is greatly reduced; and the manufacturing cost of manufacturing, transporting, mounting and the like of the heat absorption tower can be effectively reduced. The application of the integral heat pipe heat exchanger is also beneficial to reducing the temperature in the heat absorption tower or increasing the heat storage temperature, so that the heat efficiency of the system can be improved.

Description

Technical Field

[0001] The utility model relates to the field of solar thermal power generation, and in particular to a heat absorption device and a heat transmission system for solar thermal power generation. Background Art

[0002] At present, the main ways of utilizing solar energy for power generation are solar photovoltaic power generation and solar thermal power generation.

[0003] Solar thermal power generation can be divided into four types according to the form of concentration: tower type, trough type, dish type and linear Fresnel type. The current mainstream solar thermal power generation method is tower type.

[0004] In the tower solar thermal power generation system, the absorber is an important component. It is a heat exchange device that converts the high-density radiation energy reflected by the heliostat system into high-temperature thermal energy of the heat transfer medium.

[0005] The absorbers currently used are mainly exposed tube absorbers, whose main components are absorber tube panels.

[0006] In order to fully contact the solar radiation reflected by the solar mirror field, the heat absorbing tube panel needs to be installed on the cylindrical surface close to the solar receiving mirror, which makes the space in the middle part of the cylinder formed by the solar receiving mirror unable to be fully utilized.

[0007] In order to ensure the required heat exchange area, the overall size of the absorber is relatively large, that is, the diameter is large and the height is high, and the space in the middle part of the absorber cannot be fully utilized, resulting in a large installation area of ​​the entire absorber, and thus an increase in the cost. For example: the external dimensions of an exposed tube absorber with a heat absorption capacity of 5MW are approximately: 12 meters in diameter and 15 to 20 meters in height, which does not include the space occupied by the relevant insulation and anti-solidification structures at the top and bottom of the absorber. The larger size of this absorber brings a larger surface area, which brings another negative effect, namely: the outer surface of the absorber dissipates a large amount of heat, thereby increasing the heat dissipation loss and reducing the efficiency of solar energy absorption. Summary of the invention

[0008] In order to improve the defects of the currently commonly used tube-panel type heat absorber such as large volume and high heat dissipation loss, the utility model provides a solar thermal heat absorber system with an integral heat pipe heat exchanger for absorbing heat and a molten salt working medium for heat transmission.

[0009] The specific description is as follows: An integrated heat pipe heat exchanger solar heat absorption system includes a heat absorption tower, a heat transfer working medium, a working medium circulation pipeline, a working medium driving device, and a heat storage device;

[0010] The heat absorption tower includes a heat insulation cover, a heat absorber, and a solar receiving mirror; the heat absorber is installed in the internal space surrounded by the heat insulation cover and the solar receiving mirror structure; an inner surface diffuse reflection mirror is installed on the inner surface of the heat insulation cover; the heat absorber is a heat pipe heat exchanger; the heat transfer medium is molten salt; the heat transfer medium circulates in the heat absorber, the heat storage device and the heat transfer pipeline through a medium driving device.

[0011] Furthermore, the absorber includes one to multiple absorber modules, a low-temperature working fluid main pipe and a high-temperature working fluid main pipe; each absorber module includes a working fluid container and multiple heat transfer tubes located on the upper part of the absorber module; the working fluid container includes a lower wall plate and a container body above the lower wall plate, the lower wall plate is provided with through holes with the same number as the heat transfer tubes, and each heat transfer tube is inserted into the interior of the working fluid container through the through hole; the heat transfer tube is closed at both ends and filled with a phase change material that will undergo a gas-liquid phase change process within the working temperature range; the working fluid container is provided with a heat transfer working fluid high-temperature interface and a heat transfer working fluid low-temperature interface connected to its external molten salt pipeline; the heat transfer working fluid high-temperature interface is connected in parallel to the working fluid high-temperature main pipe; the heat transfer working fluid low-temperature interface is connected in parallel to the working fluid low-temperature main pipe.

[0012] Preferably, the heat transfer tube is in the shape of a cylindrical tube with both ends closed, one end being a cylindrical tube and the other end being a conical tube; the cylindrical tube section of the entire heat transfer tube is inserted into the interior of the working fluid container.

[0013] The advantage of using a tapered heat transfer tube is that solar energy is not only more easily distributed on the entire surface of the heat transfer tube (referring to the heat absorption end surface), but also more easily reaches the lower surface of the lower wall plate of the working fluid container, making the lower surface of the lower wall plate of the container also a heat absorption surface. Therefore, the length of the heat transfer tube can be shortened and the density of the heat transfer tube can be higher. Therefore, on the one hand, the total mass of the heat transfer tube can be reduced, and on the other hand, it is also beneficial to reduce the volume of the entire absorber, that is, the volume of the heat absorption tower can be smaller and the cost can be reduced.

[0014] Furthermore, the working fluid driving device includes a liquid reservoir and a working fluid circulation pump, the inlet of the liquid reservoir is connected to the working fluid outlet of the heat storage device, and the outlet is connected to the inlet of the working fluid circulation pump; the entire working fluid driving device is installed at a position lower than the heat storage device; the outlet of the working fluid circulation pump is connected to the working fluid low-temperature pipeline.

[0015] Furthermore, the heat absorber also includes an intermediate reflector, which is a diffuse reflector; the intermediate reflector is installed around a straight line in the middle of the heat absorption tower that is perpendicular to the ground.

[0016] Compared with the existing tube-panel solar heat absorption and heat transfer system, the above-mentioned integrated heat pipe heat exchanger solar heat absorption system for solar thermal power generation has the following beneficial effects: by adopting the integrated heat pipe heat exchanger, each heat transfer tube can be basically evenly distributed in the entire installation space, so the installation space can be fully utilized, while the currently commonly used molten salt heat absorber can only use the surrounding space inside the solar receiving mirror and close to the solar receiving mirror to install the heat absorption tube, that is, the "cylindrical installation" tube-panel heat exchanger is changed to a "body installation" heat exchanger (integral heat pipe heat exchanger).

[0017] Body heat tube type), and the shape of the "body-shaped" heat exchanger can be varied, and the flexibility is greatly improved; therefore, the utility model can not only reduce the installation space of the solar thermal absorption system, but also have a variety of implementation plans; since the volume of the absorber is reduced, the volume of the entire heat absorption tower is reduced, the surface area of ​​the heat absorption tower is reduced, the surface heat dissipation of the heat absorption tower is reduced, the heat absorption efficiency is improved, and the energy efficiency is improved; similarly, since the volume of the absorber is reduced, the size of the solar absorption mirror can also be reduced, further reducing the cost, and reducing the reflection of solar energy to the outside, so the efficiency is further improved.

[0018] Diffuse reflectors are installed on the inner surface of the heat absorption tower to make the solar radiation uniform throughout the heat absorption tower. On the one hand, it is beneficial to the uniform heat absorption of the absorber, and on the other hand, it reduces the average temperature inside the heat absorption tower, which helps to reduce the performance requirements for the insulation cover, reduce the investment in the insulation cover and reduce the volume of the insulation cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only part of the embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] FIG. 1 is a solar heat absorption system of an integrated heat pipe heat exchanger of the utility model, and the solar mirror field and its solar receiving mirror, heat storage device, power generation device and heat release pipeline related to the system are also expressed in the figure.

[0021] FIG. 2 is a partial enlarged view of the heat absorption tower in FIG. 1 , which is used to clearly express the structural principle inside the heat absorption tower.

[0022] FIG. 3 is a schematic diagram of the structure of a heat absorber composed of a plurality of heat pipe heat exchanger heat absorption modules in a heat absorption tower.

[0023] FIG4 is a diagram showing the structure and working principle of a "heat absorbing module" in FIG3;

[0024] FIG4A is a front view of the heat absorption module.

[0025] FIG4B is a left side view of the heat absorption module.

[0026] FIG. 4C is a cross-sectional view of the AA section in FIG. 4B , which shows the installation of each heat transfer tube inside the working medium container and the state of each heat transfer tube passing through the lower wall plate of the working medium container.

[0027] FIG4D is a three-dimensional diagram of the entire heat absorption module, which is used to help readers more intuitively understand the structural relationship between the key components of the entire heat absorption module.

[0028] FIG4E is a partial enlarged view of position B in FIG4C , in which the state of the heat transfer tube passing through the lower wall plate of the working medium container can be more clearly seen.

[0029] FIG5 is a schematic diagram of a heat absorption module using a variable cross-section heat transfer tube (tapered tube);

[0030] FIG5A is a front view of the heat absorption module.

[0031] FIG5B is a left side view of the heat absorption module.

[0032] FIG. 5C is a cross-sectional view of the AA section in FIG. 5B , which shows the installation of each heat transfer tube inside the working medium container and the state of each heat transfer tube passing through the lower wall plate of the working medium container.

[0033] FIG5D is a three-dimensional diagram of the entire heat absorption module, which is used to help readers intuitively understand the structural relationship between the key components of the entire heat absorption module.

[0034] The meanings represented by the numbers in the above figure are as follows:

[0035] 1 heat absorption tower; 11 heat preservation cover; 12 inner surface diffuse reflector; 13 heat absorber; 131 main pipe high temperature interface; 132 main pipe low temperature interface; 134 heat absorption module; 1341 working fluid high temperature interface; 1342 working fluid low temperature interface; 1343 heat transfer pipe; 13431 heat release section; 13432

[0036] 1. heat absorption section; 13433. middle section; 1347. working fluid container; 13471. lower wall of container; 13472. container body; 135. high-temperature main pipe for working fluid; 136. low-temperature main pipe for working fluid; 14. solar receiving mirror; 15. intermediate diffuse reflector; 2. solar radiation rays; 3. tower column; 4. working fluid power circulation pipeline; 41. low-temperature pipeline for working fluid; 42. high-temperature pipeline for working fluid; 5. heliostat; 6. working fluid driving device; 61. liquid storage tank; 62. working fluid circulation pump; 7. heat storage device; 8. heat transfer working fluid; 9. power generation device. DETAILED DESCRIPTION

[0037] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0038] Fig. 1 is a schematic diagram of the basic structure and process principle of each component of the integrated heat pipe heat exchanger solar heat absorption system. For the sake of simplicity, the "integrated heat pipe heat exchanger solar heat absorption system" is referred to as the "heat absorption system" below.

[0039] As shown in FIG. 1 and FIG. 2 , the heat absorption system includes a heat absorption tower 1, a heat transfer pipeline 4, a working medium driving device 6, a heat storage and release device 7, and a heat transfer working medium 8; the heat transfer working medium 8 is filled in the internal space of the heat absorber 13 (see FIG. 2 ), the heat transfer pipeline 6, and the heat storage device 7.

[0040] Among them, the heat absorption tower includes a heat insulation cover, a heat absorber, and a solar receiving mirror; the heat absorber is installed in the internal space surrounded by the heat insulation cover, the solar receiving mirror and other structures; an inner surface diffuse reflection mirror is installed on the inner surface of the heat insulation cover; the heat absorber is an integral heat pipe heat exchanger; the heat transfer medium is molten salt; the heat transfer medium circulates in the heat absorber, the heat storage device and the heat transfer pipeline through the medium driving device.

[0041] Since the heat absorption tower 1 and the heat absorber 13 installed therein are the key parts of the present invention, the structures and working principles of the heat absorption tower 1 and the heat absorber 13 will be introduced in turn below.

[0042] FIG2 is an enlarged view of the heat absorption tower portion in FIG1. ​​As shown in the figure, the heat absorption tower 1 is composed of a heat preservation cover 11, a heat absorber 13, a solar receiving mirror 14 and other components; the heat absorber 13 is installed in the internal space surrounded by the heat preservation cover 11 and the solar receiving mirror 14; an inner surface diffuse reflector 12 is also installed on the inner surface of the heat preservation cover 11, and an intermediate diffuse reflector 15 is installed around the axis of the heat absorption tower (referring to the straight line in the middle of the heat absorption tower perpendicular to the ground); in actual implementation, the heat absorber 13 is preferably divided into a plurality of heat absorption modules 134 (see FIG3), and a plurality of heat absorption modules 134 are connected in parallel to form a complete heat absorber 13.

[0043] FIG. 3 shows a schematic diagram of a preferred heat absorber structure, which is composed of one or more heat absorption modules 134 .

[0044] FIG4 shows the specific structure of each heat absorption module.

[0045] As shown in FIG4 , the heat absorption module is adapted to the application of solar thermal energy and adopts a specially designed structural form. Its basic features can be summarized as: multiple heat pipes, integral type, heat pipes of unequal lengths, and a gravity heat pipe heat exchanger consisting of upper and lower parts.

[0046] The heat absorption module mainly includes: a heat transfer tube 1343, a working fluid container 1347; wherein the working fluid container is mainly composed of a container lower wall plate 13471 and a container body 13472; there are multiple heat transfer tubes 1343, and the lengths can be the same or different, which is determined by the internal structure and shape of the heat absorption tower; referring to FIG4C, each heat transfer tube 1343 is an independent "gravity heat pipe", which is composed of three sections: a heat absorption section 13432, a heat release section 13431 and a middle section 13433, wherein the middle section is naturally formed by the container lower wall plate 13471, and the length is the same as the thickness of the container lower wall plate 13471.

[0047] The heat transfer tube 1343 is filled with a phase change material in a gas-liquid saturated state within the operating temperature range as a heat transfer medium. In the common operating temperature range of solar thermal energy, the heat transfer medium is preferably anthracene and sulfur.

[0048] During operation, the heat absorbing section 13432 of the heat transfer tube 1343 receives the heat from solar radiation, causing the liquid heat transfer medium in the heat transfer tube 1343 to vaporize and rise to the heat releasing section 13431; the gaseous heat transfer medium absorbs the heat of the heat transfer medium 8 in the heat releasing section 13431 and condenses, and falls to the heat absorbing section 13432, and this cycle continues, thereby realizing the process of absorbing the solar thermal radiation energy and transferring it to the heat transfer medium 8.

[0049] Different from the heat pipe structure in many current actual application scenarios: in this application, the "lower wall plate of the container" that plays the role of "insulation" in conventional applications is not required to have good insulation effect, nor does it need to be too thick, and the same material as the container body 13472 can be used. Because in this application scenario, the heat transfer medium (molten salt) 8 can absorb the surrounding heat from all directions, which reduces the difficulty of material selection for the container body 13472 and the lower wall plate 13471 of the container and the difficulty of processing the lower wall plate 13471 (mainly refers to the processing of the heat transfer pipe holes of the lower wall plate of the container and the sealing between the pipe holes and the heat transfer pipes).

[0050] On the working fluid container 1347 of the heat absorption module 134, interfaces for the heat transfer working fluid 8 need to be made, including a high-temperature working fluid interface 1341 and a low-temperature working fluid interface 1342, so as to facilitate docking with the heat transfer pipeline; it should be noted that the two interfaces should be set at diagonal positions that are as close as possible to each other, so as to achieve a more organized flow of the heat transfer working fluid 8 and improve the heat exchange efficiency; it should also be noted that the low-temperature working fluid interface 1342 should be set at a lower position of the working fluid container, while the high-temperature working fluid interface 1341 should be set at a higher position of the working fluid container 1347, so as to utilize the natural stratification principle of the temperature of the working fluid to form a more organized flow, avoid mixing of the heat transfer working fluid 8 with higher and lower temperatures during the flow process, reduce the heat transfer efficiency or increase the power consumption of the working fluid circulation pump.

[0051] If the installation space volume is limited and the heat transfer tube density needs to be higher or the heat transfer tube needs to be longer, it will be difficult for solar radiation to irradiate the surface of the heat transfer tube near the lower wall of the container. For this reason, the utility model proposes a design scheme of a tapered heat transfer tube.

[0052] Referring to Fig. 5, one end of the heat transfer tube is made into a cylindrical shape, and the other end is made into a conical shape, the former is the part inserted into the working medium container, i.e., the heat release section 13431, and the latter is the heat absorption section 13432. From this figure, it can be seen that solar radiation rays are more likely to irradiate the position close to the lower wall plate of the container.

[0053] The advantage of using a tapered heat transfer tube is that solar energy is not only more easily distributed on the entire surface of the heat transfer tube (referring to the heat absorption end surface), but also more easily reaches the lower surface of the lower wall plate of the working fluid container, making the lower surface of the container wall plate also a heat absorption surface. Therefore, the length of the heat transfer tube can be shortened and the density of the heat transfer tube can be higher. Therefore, on the one hand, the total mass of the heat transfer tube can be reduced, and on the other hand, it is also beneficial to reduce the volume of the entire absorber, that is, the volume of the heat absorption tower can be smaller and the cost can be reduced.

[0054] Now, let's go back to Figure 1 and Figure 2 to further explain the working principle of the system in order to further understand the system.

[0055] The heliostat 5 receives the sunlight (solar radiation energy), reflects the light to the heat absorption tower 1, and is received by the solar receiving mirror 14; the solar radiation light 2 passes through the solar receiving mirror 14, enters the heat absorption tower 1, and then can directly irradiate the heat absorber 13 (the heat absorption section 13432 of the heat transfer tube 1343), and after the solar radiation light 2 irradiates the heat transfer tube 1343, the energy is absorbed by the heat transfer tube 1343; the solar energy absorbed by the heat transfer tube 1343 is converted into heat, and the heat is transferred to the heat cycle working fluid (molten salt) 8 flowing through the heat absorber 13 by using the heat pipe principle, so that the temperature of the heat cycle working fluid (molten salt) 8 is increased; the heat cycle working fluid 8 with increased temperature returns to the heat storage device 7 along the working fluid high temperature pipeline 42, and after cooling in the heat storage device 7, the heat cycle working fluid (molten salt) 8 flows into the working fluid driving device 6, and then is driven by the working fluid circulation pump 62 in the driving device. Sent back to the heat absorber 13.

[0056] Through the continuous cycle of this process, the solar energy heat absorption and heat storage process of the entire system is completed.

[0057] The heat stored in the heat storage device 7 can be released according to the needs of power generation, and finally form continuous power output; of course, the stored heat can also be used for other heat-using equipment, such as a steam generator, so as to provide the required steam to steam users.

[0058] 3 shows a typical structure of a heat absorber 13 , which is composed of a plurality of heat absorption modules 134 . The high-temperature interfaces 1341 of each heat absorption module 134 are all connected in parallel to the high-temperature main pipe 135 . Similarly, all low-temperature interfaces 1342 of the working fluid are also all connected in parallel to the low-temperature main pipe 136 .

[0059] The high-temperature working fluid main pipe shown in Figure 3 is designed as an annular pipe, and the low-temperature working fluid main pipe is also designed as an annular main pipe. This is an optimized design scheme provided in combination with the actual positions of the high-temperature working fluid interface and the low-temperature working fluid interface of the heat absorption module of this implementation case. In the actual implementation process, the positions of the two interfaces of the heat absorption module can be appropriately adjusted so that the installation positions of the high-temperature working fluid main pipe and the low-temperature working fluid main pipe are more optimized.

[0060] In order to facilitate the connection of the whole set of heat absorbers with the working fluid circulation pipeline 4, a high-temperature interface 131 and a low-temperature interface 132 for transmitting working fluid are drawn at two positions in FIG. 3. One pair of interfaces can be used according to actual conditions, or both pairs of interfaces can be used at the same time. Even the third and fourth pairs of interfaces can be made to facilitate connection or achieve better organization of the flow process of the circulating working fluid.

[0061] The entire absorber 13 is installed inside the absorber tower 1; then, the high-temperature main pipe 135 and the low-temperature main pipe 136 of the working fluid are connected to the high-temperature pipeline 42 and the low-temperature pipeline 41 of the working fluid using the high-temperature interface 131 and the low-temperature interface 132 respectively.

[0062] It can be seen from the figure that the density of the heat transfer tubes 134 can be arranged at a higher level. Therefore, compared with the conventional heat absorption screen type heat absorption tower, the volume of the entire heat absorption device can be greatly reduced.

[0063] However, it should be noted that the heat transfer tubes 134 should not be arranged too densely to prevent the solar radiation 2 from irradiating the entire surface of the heat absorption section 13432. Therefore, in the actual implementation process, it is necessary to perform detailed thermodynamic calculations and analysis on the density, length, diameter, etc. of the heat absorption section 13432, and it is also necessary to analyze and calculate the angle of solar radiation and the light density to fully utilize the heat exchange area of ​​the heat absorption section 13432.

[0064] It can also be seen from the figure that the lengths of the heat absorbing sections 13432 do not have to be the same, because the heat absorbing sections 13432 utilize the working principle of the heat pipe, and the heat absorbed by each heat exchange surface will be quickly transferred out. That is to say, the structure of the heat absorber 13 can be flexibly designed in combination with factors such as the actual installation height of the heat absorbing tower 1 and the size of the solar receiving mirror.

[0065] In addition, since the entire heat absorber 13 is composed of multiple heat absorption modules, in specific implementation, each heat absorption module can be conveniently designed and manufactured, transported, and hoisted in a "modular" manner, and each module can be relatively conveniently made to facilitate manufacturing, transportation, and installation. Therefore, compared with the large-scale manufacturing, transportation, and installation of traditional heat absorption screen heat exchangers, it is helpful to reduce the cost of manufacturing, transportation, and hoisting.

[0066] FIG2 also shows the application of an inner surface reflector 12 installed on the inner surface of the heat absorption tower. The reflector needs to be a "diffuse reflector", that is, after the light hits the reflector, it will be reflected in all directions, and finally the light is reflected as evenly as possible onto each heat absorption section 13432.

[0067] In order to enhance the diffuse reflection of light, FIG. 2 also shows an implementation scheme of installing an “intermediate diffuse reflection mirror 15” in the middle of the heat absorption tower 1 .

[0068] It is not difficult to see from the figure that this is also an effective way to enhance light reflection.

[0069] More diffuse reflectors may be added at appropriate locations in the heat absorption tower 1, for example, some diffuse reflectors may be installed between some heat absorption modules to enhance the uniformity of the light, which will not be described in detail here.

[0070] As described above, the use of diffuse reflectors makes the temperature inside the heat absorption tower more uniform, thereby reducing the maximum temperature and average temperature inside the heat absorption tower, which reduces the heat dissipation on the outer surface of the heat absorption tower 1, thereby improving the utilization efficiency of photothermal heat.

[0071] Since the temperature inside the heat absorption tower 1 is reduced, the insulation requirement for the heat absorption tower 1 is also reduced, thereby reducing the cost of the heat absorption tower insulation structure.

[0072] It is also necessary to further explain that the heat transfer system also needs to be equipped with a working fluid driving device 6, that is, the heat transfer working fluid is circulated in the pipeline system through the power device. The power device described here is the "working fluid circulation pump".

[0073] 1 , the entire working medium driving device 6 mainly includes a liquid reservoir 61 and a working medium circulation pump 62 .

[0074] The entire process of the heat transfer working fluid cycle is: heat storage device 7, liquid storage tank 61, working fluid circulation pump 62, working fluid low temperature pipeline 41, working fluid low temperature main pipe 136, working fluid low temperature interface 1342, heat absorption module 134, working fluid high temperature interface 1341, working fluid high temperature main pipe 135, working fluid high temperature pipeline 42, and then back to the heat storage device 7.

[0075] Through the continuous cycle of this process, the heat transfer medium continuously absorbs solar heat and then releases the heat to the heat storage device.

[0076] The working fluid driving device should be installed at a position lower than the heat accumulator, which is more conducive to the organized flow of heat transfer working fluid and improves the efficiency of the system.

[0077] As described above, the technical solution of the utility model has the characteristics of flexible and convenient implementation. In specific implementation, the structures of the heat absorption tower 1 and the heat absorber 13 can be flexibly designed according to the overall design of the heat absorption system.

Claims

1. An integrated heat pipe heat exchanger solar heat absorption system, comprising a heat absorption tower, a heat transfer medium, a medium circulation pipeline, a medium driving device, and a heat storage device; the heat absorption tower comprises a heat preservation cover, a heat absorber, and a solar receiving mirror; the heat absorber is installed in the internal space surrounded by the heat preservation cover and the solar receiving mirror structure; its characteristics are: The heat absorber adopts an integral heat pipe heat exchanger; the heat transfer medium is molten salt; an inner surface diffuse reflector is installed on the inner surface of the thermal insulation cover; the heat transfer medium circulates in the heat absorber, the heat storage device and the heat transfer pipeline through a medium driving device.

2. The integrated heat pipe heat exchanger solar thermal absorption system according to claim 1 is characterized in that: The absorber includes a plurality of absorber modules, a low-temperature working fluid main pipe and a high-temperature working fluid main pipe; the absorber module includes a working fluid container and a plurality of heat transfer tubes located on the upper part of the absorber module; the working fluid container includes a lower wall plate and a container body on the lower wall plate, the lower wall plate is provided with through holes having the same number as the heat transfer tubes, and each heat transfer tube is inserted into the interior of the working fluid container through the through holes; the heat transfer tube is closed at both ends and filled with a phase change material that will undergo a gas-liquid phase change process within the working temperature range; the working fluid container is provided with a heat transfer working fluid high-temperature interface and a heat transfer working fluid low-temperature interface connected to its external molten salt pipeline; the heat transfer working fluid high-temperature interface is connected in parallel to the working fluid high-temperature main pipe; the heat transfer working fluid low-temperature interface is connected in parallel to the working fluid low-temperature main pipe.

3. The integrated heat pipe heat exchanger solar heat absorption system according to claim 2 is characterized by: The heat transfer tube is closed at both ends, one end is a cylindrical tube, and the other end is a conical tube; the cylindrical tube section of the whole heat transfer tube is inserted into the interior of the working medium container.

4. The integrated heat pipe heat exchanger solar thermal absorption system according to claim 1 is characterized in that: The working fluid driving device comprises a liquid reservoir and a working fluid circulation pump, the inlet of the liquid reservoir is connected to the working fluid outlet of the heat storage device, and the outlet is connected to the inlet of the working fluid circulation pump; the whole working fluid driving device is installed at a position lower than the heat storage device; the outlet of the working fluid circulation pump is connected to the working fluid low-temperature pipeline.

5. The integrated heat pipe heat exchanger solar thermal absorption system according to claim 2 is characterized in that: The heat absorber also includes an intermediate reflector, which is a diffuse reflector; the intermediate reflector is installed around a straight line in the middle of the heat absorption tower that is perpendicular to the ground.

Images