A curtain-type particle heat absorber with variable light-receiving area

Abstract

This invention discloses a curtain-type particle heat absorber with variable light-receiving area, comprising a heat-absorbing chamber, within which a heat-absorbing cavity is provided. The top of the heat-absorbing cavity has a particle inlet allowing particles to enter, and the bottom of the heat-absorbing cavity has a particle outlet allowing particles to exit. The side of the heat-absorbing cavity has a heat-absorbing port for allowing light to enter and heat the particles. A regulating valve is provided at the particle inlet to adjust the particles entering the heat-absorbing cavity, causing them to form a particle curtain of a specific shape. The regulating valve has at least two adjustment positions; when the valve is in different adjustment positions, the particles entering the heat-absorbing cavity form particle curtains of different specific shapes. The particle curtain of a specific shape has a linear shape in a cross-section perpendicular to the flow direction of the particle curtain, and the length of the linear shape of the particle curtain after straightening varies depending on the specific shape.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of solar thermal power generation, and particularly relates to a curtain type particle heat absorber with variable light receiving area. BACKGROUND

[0002] The particle heat absorber is one of the core devices of the third generation of light-thermal power generation technology using particles as the heat storage medium. The existing particle heat absorber mainly includes a curtain type, a rotary kiln type and a fluidized bed type, among which the curtain type heat absorber has been widely concerned by light-thermal practitioners due to its simple structure and direct particle heat absorption. The current curtain type heat absorber mainly adjusts the flow by adjusting the curtain thickness, which will cause the light transmittance of the curtain to be larger when the particle curtain is thinner and the flow is smaller, and the heat loss increases. When the flow is larger and the curtain is thicker, the particle temperature is usually high only in the front part directly receiving light, and the particle temperature is lower in the rear part relying on heat transfer, resulting in a decrease in the uniformity of the particle temperature. SUMMARY

[0003] In view of the above problems, the application provides a curtain type particle heat absorber with variable light receiving area, which comprises a heat absorbing chamber, and a heat absorbing cavity is arranged in the heat absorbing chamber. A particle inlet allowing particles to enter the heat absorbing cavity is arranged at the top of the heat absorbing cavity, a particle outlet allowing particles in the heat absorbing cavity to leave is arranged at the bottom of the heat absorbing cavity, and a heat absorbing port for allowing light to enter the heat absorbing cavity and heat the particles is arranged at the side of the heat absorbing cavity.

[0004] An adjusting valve is arranged at the particle inlet and used for adjusting the particles entering from the particle inlet to form a particle curtain with a specific shape in the heat absorbing cavity. The adjusting valve has at least two adjusting gears, and the particle curtain with different specific shapes is formed in the heat absorbing cavity when the adjusting valve is located at different adjusting gears.

[0005] The specific shape of the particle curtain in the cross section perpendicular to the flow direction of the particle curtain is linear, and the linear shape of the particle curtain with different specific shapes is different in length after being straightened.

[0006] In a curtain type particle heat absorber with variable light receiving area provided by a certain embodiment, the linear shape of the particle curtain with a specific shape is:

[0007] a zigzag line shape after being bent for multiple times;

[0008] or a curved line shape after being bent for multiple times;

[0009] or a linear shape after being bent at least once and bent at least once.

[0010] The curtain-type particle heat absorber with variable light-receiving area provided by some embodiments comprises at least one light-trap-shaped unit, which extends in a direction away from the heat absorption port and then extends in the direction of the heat absorption port after being bent or folded.

[0011] When the light irradiates on the particle curtain part corresponding to the light-trap-shaped unit, the reflected light and the reflected light after multiple reflections are all reflected on the particle curtain part corresponding to the light-trap-shaped unit.

[0012] The light-trap-shaped unit in the curtain-type particle heat absorber with variable light-receiving area provided by some embodiments is in the shape of "V" or "U".

[0013] The light-trap-shaped unit in the curtain-type particle heat absorber with variable light-receiving area provided by some embodiments is in the shape of "V", the line shape comprises a plurality of light-trap-shaped units, and the taper of the light-trap-shaped unit decreases from the middle to the two ends of the line shape.

[0014] The thicknesses of the particle curtains with different specific shapes are the same in the curtain-type particle heat absorber with variable light-receiving area provided by some embodiments.

[0015] The adjusting valve in the curtain-type particle heat absorber with variable light-receiving area provided by some embodiments comprises:

[0016] The shutter is provided with a plurality of flow channels corresponding to the particle curtains with different specific shapes one by one and arranged at intervals.

[0017] The driver is fixedly connected to the heat absorption chamber, and the output end of the driver is connected with the shutter, so that the driver drives the shutter to move, so that the particles form the particle curtains with different specific shapes through different flow channels when the adjusting valve is in different gears.

[0018] The buffer cavity is further arranged in the heat absorption chamber, and the buffer cavity is arranged at the top of the heat absorption cavity, and the outlet at the bottom of the buffer cavity is communicated with the particle inlet; and the bottom of the buffer cavity is always filled with particles during operation.

[0019] The heat absorption chamber comprises a firebrick layer formed by firebricks, and the interior of the firebrick layer is the heat absorption cavity.

[0020] The heat absorption chamber comprises a firebrick layer formed by firebricks, and the interior of the firebrick layer is the heat absorption cavity.

[0021] The present application has the following advantages and positive effects compared with the prior art due to the adoption of the above technical solutions:

[0022] The curtain type particle heat absorber with variable light receiving area provided by the present application has different linear shapes of particle curtains with different specific shapes, and the lengths of the different linear shapes are different after being straightened. Therefore, even if the thicknesses of the particle curtains with different specific shapes are the same, the flow rates of the particle curtains are different. Therefore, when the flow rate of the particle curtain needs to be adjusted, the thickness of the particle curtain does not need to be adjusted, so that the thickness of the particle curtain can always be maintained at a suitable thickness. BRIEF DESCRIPTION OF DRAWINGS

[0023] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a better understanding of the preferred embodiments, and are not to be considered as limiting of the present application.

[0024] Figure 1 FIG. 1 is a structural schematic diagram of a curtain type particle heat absorber with variable light receiving area according to the present application;

[0025] Figure 2 FIG. 2 is a linear shape schematic diagram of a particle curtain according to the present application;

[0026] Figure 3 FIG. 3 is a structural schematic diagram of an adjusting valve according to the present application.

[0027] BRIEF DESCRIPTION OF DRAWINGS

[0028] 1: housing; 2: heat preservation layer; 3: fireproof brick layer; 4: heat absorption port; 5: heat absorption cavity; 6: adjusting valve; 61: driver; 62: gate plate; 63: valve body plate; 64: weight-reducing hole; 65: flow channel; 66: passage; 7: buffer cavity; 8: incident light; 9: linear shape. DETAILED DESCRIPTION

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, specific embodiments of the present application will be described below with reference to the drawings. Obviously, the drawings in the following description only represent some embodiments of the present application, and other drawings can be obtained by those of ordinary skill in the art without creative effort based on these drawings, and other embodiments can also be obtained.

[0030] In order to make the drawings simple, only the parts related to the present application are shown in each drawing, and they do not represent the actual structure of the product. In addition, in order to make the drawings simple and easy to understand, in some drawings, only one of the parts with the same structure or function is shown schematically, or only one of them is marked. In this document, "one" not only means "only one", but also means "more than one" situation.

[0031] Reference Figures 1 to 3This embodiment provides a curtain-type particle heat absorber with variable light-receiving area, including a heat absorption chamber, and a heat absorption cavity 5 is provided in the heat absorption cavity. The top of the heat absorption cavity 5 is provided with a particle inlet that allows particles to enter the heat absorption cavity 5, the bottom of the heat absorption cavity 5 is provided with a particle outlet that allows particles to leave the heat absorption cavity 5, and the side of the heat absorption cavity 5 is provided with a heat absorption port 4 for allowing light to enter the heat absorption cavity 5 and heat the particles.

[0032] A regulating valve 6 is provided at the particle inlet to regulate the particles entering from the particle inlet so that they enter the heat absorption chamber 5 and form a particle curtain of a specific shape. The regulating valve 6 has at least two regulating positions, and when the regulating valve 6 is in different regulating positions, the particles entering the heat absorption chamber 5 form a particle curtain of different specific shapes.

[0033] A particle curtain of a specific shape has a linear shape (9) on a cross-section perpendicular to its flow direction. The length of this linear shape (9) varies when straightened, depending on the specific shape of the particle curtain. Therefore, even if different particle curtains of different shapes have the same thickness, their flow rates will differ. Thus, when adjusting the flow rate of the particle curtain, it is not necessary to adjust its thickness, ensuring that the thickness of the particle curtain remains at a suitable level.

[0034] The linear shape 9 of a particle curtain with a specific shape can be a zigzag shape that has undergone multiple bends, such as... Figure 2 As shown; or a curved shape with multiple bends, similar to a wave; or a line shape with at least one bend and at least one curve, etc.; no restrictions are placed here.

[0035] Preferably, the linear shape 9 includes at least one light trap shape unit, which is characterized by extending away from the heat absorption port 4 and then bending or folding back towards the heat absorption port 4, resembling a "V" or "U" shape, etc. When light shines on the particle curtain portion corresponding to the light trap shape unit, the initial reflection of the incident light 8 on the particle curtain and the reflected light after multiple reflections are both reflected onto the particle curtain portion corresponding to the light trap shape unit. Typically, solar radiation, after being concentrated by the mirror field, enters the heat absorption cavity 5 at a certain angle and shines on the particle curtain. The particle curtain generally absorbs some of the thermal radiation covering it and reflects some of it away. The arrangement of the light trap shape unit ensures that the reflected light and the reflected light after multiple reflections are both reflected onto the particle curtain, such as... Figure 2 As shown, multiple absorptions will significantly reduce the reflection loss of the heat absorber (unless otherwise specified here and below, the heat absorber refers to the curtain-type particle heat absorber with variable light-receiving area provided in this embodiment).

[0036] Due to the light-concentrating strategy, the temperature of the granular curtain is typically higher at the center and lower at the sides. Therefore, when designing the linear shape 9 of the granular curtain, reference should be made to... Figure 2The linear shape 9 includes a plurality of light-trap shape units, the taper of the light-trap shape units (the taper herein does not refer to the taper in strict definition, but more like the opening size, since the light-trap shape units are not necessarily "V" shaped, but can have shapes like "U" shaped, etc.) decreases from the middle of the linear shape to the two ends, so as to balance the temperature and improve the uniformity of the outlet temperature.

[0037] The regulating valve 6 includes a shutter 62 and a driver 61. The shutter 62 is provided with a plurality of flow channels 65 corresponding to different specific shape particle curtains in a spaced manner. The driver 61 is fixedly connected to the heat absorption chamber, and the output end thereof is connected with the shutter 62, for driving the shutter 62 to move, so that the particles form different specific shape particle curtains through different flow channels 65 when the regulating valve 6 is in different gears.

[0038] Specifically, as shown in Figure 3 The regulating valve 6 further includes a valve body, which includes two valve body plates 63 arranged side by side in a spaced manner. The shutter 62 is arranged between the two valve body plates 63, and the three plates are stacked. The two valve body plates 63 are connected and fixedly connected to the heat absorption chamber. The valve body closes the entire particle inlet. A passage 66 is arranged on the valve body to communicate with the heat absorption chamber 5. When the driver 61 drives one flow channel 65 on the shutter 62 to align with the passage 66, the particles can enter the heat absorption chamber 5 through the passage 66 and the flow channel 65. The shape of the particle curtain formed by the particles entering the heat absorption chamber 5 is determined by the flow channel 65 aligned by the passage 66. The upper valve body plate 63 can be provided with a weight-reducing hole 64 for reducing the structural weight of the regulating valve 6. The driver 61 can adopt a linear driving mechanism, or a non-linear driving structure matched with a transmission structure to drive the shutter 62 to move, which is not limited here.

[0039] The widths of all the flow channels 65 on the shutter 62 can be set to be the same, so that the thicknesses of the specific shape particle curtains formed by the particles passing through these flow channels 65 are the same. Since the light transmittance of the particle curtain is larger when the thickness of the particle curtain is smaller, the heat energy loss increases. When the thickness of the particle curtain is larger, the temperature of the particles in the front directly receiving light is high, while the temperature of the particles in the rear relying on heat transfer is lower, due to the low thermal conductivity of the particles, resulting in a decrease in the temperature uniformity of the particles. Therefore, the widths of the flow channels 65 are preferably specially set, so that the thicknesses of the specific shape particle curtains formed by the particles passing through the flow channels 65 can avoid the above two problems or find a balance point in the two problems.

[0040] The inner wall of the heat absorption cavity 5 is made of wear-resistant material to prevent the particles from wearing the inner wall of the heat absorption cavity 5 and affecting the heat absorption efficiency of the heat absorber. Specifically, the heat absorption chamber includes a firebrick layer 3 made of firebricks, and the heat absorption cavity 5 is inside the firebrick layer 3. A heat preservation layer 2 can be arranged outside the firebrick layer 3 to maintain the temperature in the heat absorption cavity 5, reduce heat loss, and improve the heat absorption efficiency of the heat absorber. The heat preservation layer 2 can be the shell 1 of the heat absorption chamber, which provides structural support for the heat absorption chamber.

[0041] A buffer cavity 7 can be further arranged in the heat absorption chamber, which is arranged at the top of the heat absorption cavity 5, and the outlet at the bottom of the buffer cavity 7 is in communication with the particle inlet. During operation, there are always particles accumulated at the bottom of the buffer cavity 7. After entering the heat absorber, the particles first enter the buffer cavity 7 and are temporarily stored therein, and the particles near the opening at the bottom of the buffer cavity 7 fall down and enter the heat absorption cavity 5 through the particle opening and the regulating valve 6 to form a particle curtain with a specific shape. The design of the buffer cavity 7 can maintain the continuity of the particle curtain in the heat absorption cavity 5. The buffer cavity 7 can also be formed by stacking firebricks, and the heat preservation layer 2 and the shell can include the buffer cavity 7.

[0042] The variable-area curtain-type particle heat absorber provided in the embodiment has at least the following advantages:

[0043] 1) When the light intensity changes and the particle curtain flow needs to be adjusted, the heat absorber provided in the embodiment can adjust the gear position of the regulating valve 6 to adjust the particle curtain with different specific shapes, change the length of the linear shape 9 after being straightened, and then change the area receiving solar radiation under the condition that the width of the particle curtain (i.e. the length of the linear shape 9 before being straightened) and the thickness of the particle curtain remain unchanged, thereby achieving the effect of changing the particle flow. The traditional heat absorber adjusts the thickness of the particle curtain when adjusting the particle flow. Therefore, using the heat absorber provided in the embodiment can effectively avoid the increase in the light transmittance of the particle curtain due to the too small thickness of the particle curtain when adjusting the thickness of the curtain, which further affects the performance of the heat absorber; or the temperature of the particles receiving light in front cannot be timely conducted to the particles behind due to the too large thickness of the particle curtain, causing a large temperature difference between the particles and a decrease in the uniformity of the particle temperature, which affects the system performance.

[0044] 2) The particle curtain formed by using the heat absorber provided in the embodiment has a linear shape 9 with bending or / and curvature, which can reduce the width of the particle curtain, effectively reduce the volume of the heat absorber, and reduce the manufacturing cost of the heat absorber.

[0045] 3) The heat absorber provided by the embodiment has light trap shaped units, which can make the particle reflection and thermal radiation be absorbed by the adjacent part of the particle curtain, reduce the loss of reflected light and high temperature thermal radiation, increase the particle curtain absorption rate, reduce the influence caused by the particle emissivity, increase the efficiency of the heat absorber, and reduce the requirement for the performance of the particle material medium (in the traditional heat absorber, the particles with low reflection and low thermal radiation are selected to reduce the reflection and thermal radiation).

[0046] The embodiments of the present application are described in detail above with reference to the drawings, but the present application is not limited to the above-described embodiments. Even if various changes are made to the present application, if the changes belong to the scope of the claims of the present application and equivalent technologies thereof, they still fall within the protection scope of the present application.

Claims

1. A variable-area curtain particle heat sink, comprising: The heat absorption chamber is internally provided with a heat absorption cavity; the top of the heat absorption cavity is provided with a particle inlet allowing particles to enter the heat absorption cavity; the bottom of the heat absorption cavity is provided with a particle outlet allowing particles in the heat absorption cavity to exit; and the side of the heat absorption cavity is provided with a heat absorption port for allowing light to enter the heat absorption cavity and heat the particles. The particle inlet is provided with an adjusting valve for adjusting the particles entering from the particle inlet to form a particle curtain with a specific shape in the heat absorption cavity; the adjusting valve has at least two adjusting gears, and the particles entering the heat absorption cavity form particle curtains with different specific shapes when the adjusting valve is at different adjusting gears. The shape of the particle curtain with a specific shape in the cross section perpendicular to the flow direction of the particle curtain is linear, and the linear shape of the particle curtains with different specific shapes is different in length after being straightened. The thickness of the particle curtains with different specific shapes is the same.

2. The variable light-gathering-area curtain-style particle heat absorber of claim 1, wherein, The linear shape of the particle curtain with a specific shape is: a zigzag line shape after being bent multiple times; or a curved line shape after being bent multiple times; or a linear shape after being bent at least once and after being straightened at least once.

3. The variable light-gathering-area curtain-style particle heat absorber of claim 1, wherein, The linear shape includes at least one light trap shape unit, which extends away from the heat absorption port first, and then extends towards the heat absorption port after being bent or folded. When light irradiates on the particle curtain part corresponding to the light trap shape unit, the reflected light and the reflected light after multiple reflections are all reflected on the particle curtain part corresponding to the light trap shape unit.

4. The variable light-gathering-area curtain-style particle heat absorber of claim 3, wherein, The light trap shape unit is "V" shaped or "U" shaped.

5. The variable light-gathering-area curtain-style particle heat absorber of claim 4, wherein, When the light trap shape unit is "V" shaped, the linear shape includes multiple light trap shape units, and the taper of the light trap shape unit decreases from the middle to the two ends of the linear shape.

6. The variable light-gathering-area curtain-style particle heat absorber of claim 1, wherein, The adjusting valve includes: a shutter provided with multiple flow channels corresponding to the particle curtains with different specific shapes one by one and arranged at intervals; a driver fixedly connected to the heat absorption chamber, with an output end connected to the shutter, for driving the shutter to move, so that the particles form particle curtains with different specific shapes through different flow channels when the adjusting valve is at different gears.

7. The variable light-gathering-area curtain-style particle heat absorber of claim 1, wherein, The heat absorption chamber is further provided with a buffer cavity arranged at the top of the heat absorption cavity, and the outlet at the bottom of the buffer cavity is in communication with the particle inlet; and the bottom of the buffer cavity is always filled with particles during operation.

8. The variable light-gathering-area curtain-style particle heat absorber of claim 1, wherein, The heat absorption chamber includes a firebrick layer formed by firebricks, and the inside of the firebrick layer is the heat absorption cavity.

9. The variable light-gathering-area curtain-style particle heat absorber of claim 8, wherein, The firebrick layer is externally provided with a heat preservation layer.

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