Dual-reflection particle heat absorber and method of conditioning thereof

Abstract

The application discloses a kind of secondary reflection type particle heat absorber and its adjusting method, secondary reflection type particle heat absorber includes: shell, upper portion is formed with feed inlet, side portion is formed with incident port, and the accommodating portion formed has;Input component is connected to shell and inputs heat-absorbing particle to shell;Guide plate is arranged below feed inlet for receiving and guiding heat-absorbing particle;Temperature sensor is arranged in accommodating portion to detect the temperature of heat-absorbing particle in it;First adjusting mechanism, the inclination angle of guide plate is adjusted by rotating;Reflective panel is arranged on the upper portion of shell to reflect sunlight from incident port into guide plate so as to heat heat-absorbing particle on guide plate;Second adjusting mechanism is connected to reflective panel to adjust the position of sunlight from reflective panel to guide plate.The secondary reflection type particle heat absorber and its adjusting method provided by the application are simple in particle flow rate and flow control, and the heat-absorbing process is controllable.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of heat exchangers, and particularly relates to a secondary reflection type particle heat absorber and a regulating method thereof. BACKGROUND

[0002] With the construction of a high-proportion new energy power system, the unstable characteristics of new energy such as photovoltaic and wind power result in an increasingly prominent phenomenon of curtailment of wind and light. Thermal power generation is an excellent energy storage peak shaving power source, and can realize stable power output in cooperation with photovoltaic and wind power. At present, the degree of electric cost of the molten salt energy storage type thermal power generation technology which has realized commercial application is still high, which limits the development of thermal power generation technology. Therefore, the next generation of thermal power generation technology with solid particle heat absorption and storage as the core technology is being researched at home and abroad.

[0003] The particle heat absorber is the core equipment of the solid particle heat absorption and storage technology, and the free falling type heat absorber is one of the mainstream forms of the particle heat absorber. The heat absorption structure of the free falling type heat absorber adopts a cavity type opening, solar energy is focused on the particle curtain in the free falling stroke through the opening of the heat absorber, and the particles are heated after absorbing the solar energy. However, the particle falling process of the existing free falling type heat absorber is uncontrollable, the temperature rise is difficult to control, the temperature difference of the particles after heat absorption is large, and it is difficult to adjust the variable load condition. SUMMARY

[0004] The application provides a secondary reflection type particle heat absorber and a regulating method thereof to solve the above-mentioned technical problems, and specifically adopts the following technical scheme:

[0005] A secondary reflection type particle heat absorber comprises:

[0006] A shell, an upper part of the shell is formed with a feeding port, a side part of the shell is formed with an incident port, and a lower part of the shell is formed with a containing part;

[0007] An input assembly connected to the feeding port of the shell is used to adjustably input heat absorption particles into the shell;

[0008] A guide plate is arranged below the feeding port at a certain inclination angle and is used to receive and guide the heat absorption particles into the containing part;

[0009] A temperature sensor is arranged in the containing part and is used to detect the temperature of the heat absorption particles in the containing part;

[0010] A first regulating mechanism is connected to the guide plate and is used to rotate and adjust the inclination angle of the guide plate;

[0011] A reflection panel is arranged on the upper part of the shell and is used to reflect the sunlight entering from the incident port to the guide plate, so as to heat the heat absorption particles on the guide plate;

[0012] a second adjusting mechanism connected to the reflecting panel for adjusting the position of the sunlight emitted from the reflecting panel to the guiding panel.

[0013] Further, the second adjusting mechanism adjusts the reflecting panel in parallel.

[0014] Further, the second adjusting mechanism adjusts the reflecting panel in parallel along a direction perpendicular to the reflecting panel.

[0015] Further, the second adjusting mechanism adjusts the reflecting panel in rotation with a rotation axis extending along a direction perpendicular to the optical axis of the incident sunlight.

[0016] Further, the guiding panel is a metal panel.

[0017] Further, the secondary reflecting particle heat absorber further comprises a light-transmitting member disposed at the incident port.

[0018] Further, the secondary reflecting particle heat absorber further comprises a detector for detecting the intensity of the sunlight.

[0019] Further, the input assembly comprises a feeding bin disposed above the housing and a regulating valve disposed at the connecting pipeline for regulating the amount of the feeding.

[0020] A method for adjusting the secondary reflecting particle heat absorber as described above, comprising the following steps:

[0021] detecting the intensity of the sunlight;

[0022] adjusting the amount of the feeding and the inclination angle of the guiding panel according to the intensity of the sunlight;

[0023] detecting the temperature of the heated heat-absorbing particles;

[0024] adjusting the position of the reflecting panel according to the detected temperature to change the position of the sunlight emitted from the reflecting panel to the guiding panel.

[0025] Further, the position of the reflecting panel is adjusted by rotating the reflecting panel or translating the reflecting panel.

[0026] The advantages of this invention lie in the fact that the provided secondary reflective particle heat absorber and its adjustment method are simple to control in terms of particle flow rate and volume, and the heat absorption process is controllable. Furthermore, the secondary reflective particle heat absorber and its adjustment method of this application provide two load adjustment methods: coarse adjustment and fine adjustment. This ensures uniform particle heat absorption temperature and allows for control of the heat absorption temperature under different load conditions. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of a secondary reflective particle heat absorber according to the present invention;

[0029] Figure 2 This is a flowchart of an adjustment method for a secondary reflective particle heat absorber according to the present invention;

[0030] Housing 10, feed inlet 11, injection port 12, receiving part 13, input component 20, feed bin 21, regulating valve 22, guide plate 30, first regulating mechanism 40, temperature sensor 50, reflective panel 60, second regulating mechanism 70, light-transmitting element 80. Detailed Implementation

[0031] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0032] In the description of this application, unless otherwise expressly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0033] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] like Figure 1 The image shows a secondary reflective particle heat absorber according to this application, which can adjust the particle flow rate based on the intensity of sunlight and the temperature of the heated heat-absorbing particles. In an embodiment of this application, the secondary reflective particle heat absorber includes: a housing 10, an input component 20, a guide plate 30, a temperature sensor 50, a first adjustment mechanism 40, a reflective panel 60, and a second adjustment mechanism 70.

[0035] Specifically, the upper part of the housing 10 has a feed inlet 11 for feeding heat-absorbing particles. The side of the housing 10 has an inlet 12 for allowing sunlight to enter, and the lower part of the housing 10 has a receiving portion 13 for accommodating the heat-absorbing particles after they have absorbed heat. An input assembly 20 is connected to the feed inlet 11 of the housing 10 and can adjustably feed heat-absorbing particles into the housing 10. That is, the input assembly 20 can adjust the amount of heat-absorbing particles fed into the housing 10 as needed. A temperature sensor 50 is provided in the receiving portion 13 to detect the temperature of the heat-absorbing particles therein.

[0036] A guide plate 30 is positioned at a certain angle below the feed inlet 11 to receive and guide the heat-absorbing particles into the receiving section 13. Preferably, to improve heat absorption efficiency, the guide plate 30 is preferably made of metal. A first adjustment mechanism 40 is connected to the guide plate 30 to rotate and adjust the tilt angle of the guide plate 30.

[0037] Understandably, the falling speed of the heat-absorbing particles guided by the guide plate 30 can be adjusted by changing the tilt angle of the guide plate 30. The larger the tilt angle of the guide plate 30, the faster the heat-absorbing particles fall.

[0038] A reflector panel 60 is disposed on the upper part of the housing 10 to reflect sunlight entering from the inlet 12 to the guide plate 30, thereby heating the heat-absorbing particles on the guide plate 30. In this way, sunlight focused by the heliostat is reflected twice by the reflector panel 60 before heating the heat-absorbing particles. A second adjustment mechanism 70 is connected to the reflector panel 60 to adjust the position of the sunlight emitted from the reflector panel 60 to the guide plate 30.

[0039] It can be understood that after the heat-absorbing particles input from the input assembly 20 fall on the guide plate 30, they fall into the containing part 13 under the guidance of the guide plate 30. During the process that the heat-absorbing particles first contact the guide plate 30 until they leave the guide plate 30 after being guided for a certain distance, the falling speed of the heat-absorbing particles gradually increases under the action of gravity. Therefore, the sunlight reflected by the reflecting panel 60 irradiates different heights of the guide plate 30, and the irradiation time of the heat-absorbing particles is different. The faster the speed of the irradiated heat-absorbing particles, the less heat they absorb. This means that under the same conditions, when the sunlight reflected by the reflecting panel 60 irradiates the upper part of the guide plate 30, the heat-absorbing particles absorb more heat, thereby making the temperature of the heat-absorbing particles higher.

[0040] In the present application, the input assembly 20 comprises a feeding bin 21 and an adjusting valve 22, the feeding bin 21 is arranged above the housing 10, and the feeding bin 21 is connected to the feeding port 11 through a connecting pipeline, and the adjusting valve 22 is arranged in the connecting pipeline for adjusting the amount of discharge.

[0041] The working principle of the secondary reflection type particle heat-absorbing device of the present application is as follows: the sunlight focused by the heliostat first irradiates the reflecting panel 60 through the incident port 12, and the reflecting panel 60 reflects the sunlight to the guide plate 30. According to the light intensity of the sunlight, the opening of the adjusting valve 22 of the input assembly 20 and the angle of the guide plate 30 are adjusted. Specifically, when the light intensity of the sunlight is strong, the opening of the adjusting valve 22 and the inclination angle of the guide plate 30 are increased, thereby increasing the amount of heat-absorbing particles and the falling speed of the heat-absorbing particles. Conversely, when the light intensity of the sunlight is weak, the opening of the adjusting valve 22 and the inclination angle of the guide plate 30 are decreased, thereby reducing the amount of heat-absorbing particles and the falling speed of the heat-absorbing particles. The above-mentioned adjustment process is a coarse adjustment process.

[0042] After the coarse adjustment is completed, fine adjustment is performed according to the temperature value detected by the temperature sensor 50. Specifically, when the temperature of the heat-absorbing particles exceeds the preset value, the reflecting panel 60 is adjusted so that the position of the sunlight reflected to the guide plate 30 is lowered, thereby reducing the heat absorption of the heat-absorbing particles. Similarly, when the temperature of the heat-absorbing particles is lower than the preset value, the reflecting panel 60 is adjusted so that the position of the sunlight reflected to the guide plate 30 is raised, thereby increasing the heat absorption of the heat-absorbing particles. The above-mentioned adjustment mainly depends on the difference in the falling speed of the heat-absorbing particles at different height positions of the guide plate 30. The difference in the falling speed of the heat-absorbing particles at different height positions of the guide plate 30 is small, and therefore the adjustment by the reflecting panel 60 is more precise.

[0043] In the embodiment of the present application, the second adjusting mechanism 70 adjusts the reflecting panel 60 to move in parallel, specifically, the second adjusting mechanism 70 adjusts the reflecting panel 60 in parallel along a direction perpendicular to the reflecting panel 60. Preferably, the reflecting panel 60 is arranged horizontally.

[0044] It can be understood that, as another alternative embodiment, the second adjusting mechanism 70 can also be a rotating adjusting mechanism for rotating the reflecting panel 60 about a rotating axis extending along a direction perpendicular to the optical axis of the incident sunlight. The height of the reflected sunlight is adjusted by the rotation of the reflecting panel 60.

[0045] As a preferred embodiment, the secondary reflecting particle heat absorber further comprises a light-transmitting member 80 arranged in the entrance 12. The light-transmitting member 80 prevents the heat loss caused by the convection of the air outside the housing 10, thereby greatly reducing the heat loss inside the housing 10. In the embodiment of the present application, the light-transmitting member 80 is quartz glass.

[0046] As an alternative embodiment, the secondary reflecting particle heat absorber further comprises a detector for detecting the intensity of the sunlight. It can be understood that the detector is arranged in the light path of the sunlight or in the vicinity of the light path. The detector can be arranged outside or inside the housing 10 as required.

[0047] It can be understood that the adjusting valve 22, the first adjusting mechanism 40 and the second adjusting mechanism 70 are automatic mechanisms, and the controller can automatically control the adjusting valve 22, the first adjusting mechanism 40 and the second adjusting mechanism 70 according to the intensity value of the sunlight detected by the detector and the temperature value detected by the temperature sensor.

[0048] In the embodiment of the present application, the sunlight is incident into the housing 10 in an upwardly inclined manner. It can be understood that the incident angle of the sunlight can be adjusted as required by the system.

[0049] As shown in FIG. 1, the present application also discloses an adjusting method for the aforementioned secondary reflecting particle heat absorber, which comprises the following steps: Figure 2

[0050] S1: detecting the intensity of the sunlight.

[0051] S2: adjusting the feeding amount and the inclination angle of the guide plate according to the intensity of the sunlight.

[0052] S3: detecting the temperature of the heated heat-absorbing particles.

[0053] S4: adjusting the position of the reflecting panel according to the detected temperature to change the position of the sunlight emitted from the reflecting panel to the guide plate, and adjusting the position of the sunlight emitted from the reflecting panel to the guide plate.

[0054] ​In step S2, when the intensity of the sunlight is strong, the opening of the adjusting valve 22 and the inclination angle of the guide plate 30 are increased to increase the falling speed of the heat-absorbing particles while increasing the amount of the heat-absorbing particles. Conversely, when the intensity of the sunlight is weak, the opening of the adjusting valve 22 and the inclination angle of the guide plate 30 are decreased to decrease the falling speed of the heat-absorbing particles while decreasing the amount of the heat-absorbing particles. In step S4, when the temperature of the heat-absorbing particles exceeds a preset value, the position of the sunlight reflected to the guide plate 30 is lowered by adjusting the reflecting panel 60. Similarly, when the temperature of the heat-absorbing particles is lower than the preset value, the position of the sunlight reflected to the guide plate 30 is raised by adjusting the reflecting panel 60.

[0055] In step S4, the position of the reflecting panel 60 is preferably adjusted by rotating the reflecting panel 60 or translating the reflecting panel 60.

[0056] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the above-mentioned embodiments do not limit the present application in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the protection scope of the present application.

Claims

1. A secondary reflection type particle heat absorber, characterized in that, Include: The housing has a feed inlet at its upper part, an injection port at its side, and a receiving portion at its lower part. An input component, connected to the feed inlet of the housing, can adjustably input heat-absorbing particles into the housing; A guide plate is positioned at a certain angle below the feed inlet to receive and guide the heat-absorbing particles into the receiving section; A temperature sensor is disposed in the accommodating portion to detect the temperature of the heat-absorbing particles therein; A first adjustment mechanism is connected to the guide plate to rotate and adjust the tilt angle of the guide plate; A reflective panel, disposed on the upper part of the housing, is used to reflect sunlight entering from the inlet to the guide plate, thereby heating the heat-absorbing particles on the guide plate; A second adjustment mechanism is connected to the reflective panel to adjust the position of sunlight emitted from the reflective panel to the guide plate; The input component includes a feed hopper and a regulating valve. The feed hopper is located above the housing and is connected to the feed inlet via a connecting pipe. The regulating valve is located on the connecting pipe and is used to regulate the discharge rate. When the sunlight intensity is strong, the opening of the regulating valve and the tilt angle of the guide plate are increased to increase the amount of heat-absorbing particles and increase the falling speed of the heat-absorbing particles. When the sunlight intensity is weak, the opening of the regulating valve and the tilt angle of the guide plate are decreased to reduce the amount of heat-absorbing particles and decrease the falling speed of the heat-absorbing particles. When the temperature of the heat-absorbing particles exceeds the preset value, the reflective panel is adjusted to lower the position of the sunlight reflected onto the guide plate, thereby reducing the heat absorption of the heat-absorbing particles. When the temperature of the heat-absorbing particles is lower than the preset value, the reflective panel is adjusted to raise the position of the sunlight reflected onto the guide plate, thereby increasing the heat absorption of the heat-absorbing particles.

2. The secondary reflection type particle heat absorber according to claim 1, characterized in that, The second adjustment mechanism adjusts the reflective panel to move it in parallel.

3. The secondary reflection type particle heat absorber according to claim 2, characterized in that, The second adjustment mechanism adjusts the reflective panel parallel to the direction perpendicular to the reflective panel.

4. The secondary reflection type particle heat absorber according to claim 1, characterized in that, The second adjustment mechanism rotates the reflective panel so that it rotates along a rotation axis that extends perpendicular to the optical axis of the incident sunlight.

5. The secondary reflection type particle heat absorber according to claim 1, characterized in that, The guide plate is a metal plate.

6. The secondary reflection type particle heat absorber according to claim 1, characterized in that, The secondary reflective particle heat absorber also includes a light-transmitting element, which is disposed at the inlet.

7. The secondary reflection type particle heat absorber according to claim 1, characterized in that, The secondary reflective particulate heat absorber also includes a detector for detecting the intensity of sunlight.

8. A method for adjusting a secondary reflective particulate heat absorber according to any one of claims 1-7, characterized in that, Includes the following steps: Detecting the intensity of sunlight; The feed rate and the tilt angle of the guide plate are adjusted according to the intensity of sunlight. Detect the temperature of the heat-absorbing particles after heating; Adjusting the position of the reflective panel according to the detected temperature changes the position of sunlight emitted from the reflective panel to the guide plate.

9. The adjustment method for a secondary reflective particle heat absorber according to claim 8, characterized in that, The position of the reflective panel can be adjusted by rotating or translating the reflective panel.

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