阅读说明：本技术 一种颗粒吸热器及太阳能发电系统 (Particle heat absorber and solar power generation system ) 是由 刘琦 章晓敏 宓霄凌 其他发明人请求不公开姓名 于 2021-07-02 设计创作，主要内容包括：本发明公开了一种颗粒吸热器及太阳能发电系统,通过与吸热管连通的气体供给部,由气体供给部向吸热管内提供自下而上的气流,气流与颗粒形成逆向流动,可以起到降低颗粒下落速度的作用,使得颗粒在吸热管内的滞留时间延长,换热时间延长,提高颗粒的吸热效率,解决了现有颗粒吸热器吸热效率低的问题。(The invention discloses a particle heat absorber and a solar power generation system, wherein an air supply part communicated with a heat absorption pipe provides airflow from bottom to top in the heat absorption pipe, the airflow and particles form reverse flow, the effect of reducing the falling speed of the particles can be achieved, the retention time of the particles in the heat absorption pipe is prolonged, the heat exchange time is prolonged, the heat absorption efficiency of the particles is improved, and the problem of low heat absorption efficiency of the existing particle heat absorber is solved.)

1. A particle heat absorber comprises a heat absorber body, at least one heat absorbing pipe (3) is arranged in the heat absorber body, and the particle heat absorber is characterized by further comprising a gas supply part;

the gas supply part is communicated with the bottom of the heat absorption pipe (3) and is used for supplying gas which flows from bottom to top into the heat absorption pipe (3).

2. Particle heat absorber according to claim 1, characterized in that at least one flow-impeding element is arranged in the heat absorber tube (3), the light-receiving side end of which is positioned lower in height than the backlight side end thereof.

3. The particle heat absorber according to claim 2, wherein the flow inhibitor is a hollow flow-blocking column (4), the hollow flow-blocking column (4) comprises an air inlet and an air outlet, the air inlet of the hollow flow-blocking column (4) is arranged at the lower part of the end of the hollow flow-blocking column (4) at the light receiving side, and the air outlet of the hollow flow-blocking column (4) is arranged at the upper part of the end of the hollow flow-blocking column (4) at the backlight side.

4. The particulate heat absorber of claim 2, wherein the hollow flow-blocking columns (4) are arranged in the heat absorbing pipe (3) from top to bottom in sequence, and projections of two adjacent hollow flow-blocking columns (4) in the vertical direction are not coincident.

5. The particulate heat sink of claim 3 wherein the outlet vent is a plurality of vents (402), the vents (402) being smaller in size than the particulates.

6. A particulate heat sink according to claim 5, characterized in that the hollow flow-blocking columns (4) are provided with protrusions (403) on the outer wall surface at the edge of the air outlet opening (402).

7. The particulate heat absorber of claim 2, wherein the baffle is upwardly inclined at an angle of 30 ° to 40 °.

8. The particulate heat sink according to claim 1, wherein the gas supply comprises a gas line (6) and a gas drive unit (7) mounted on the gas line (6);

one end of the gas pipeline (6) is communicated with the bottom of the heat absorption pipe (3), and the other end of the gas pipeline (6) is communicated with the top of the heat absorption pipe (3).

9. The particulate heat sink of claim 1, wherein the heat sink body comprises a heat sink housing (5); each heat absorption pipe is arranged around the inner wall of the heat absorber shell (5).

10. A solar power generation system comprising a particulate heat absorber as claimed in any one of claims 1 to 9.

Technical Field

The invention belongs to the technical field of solar thermal power generation, and particularly relates to a particle heat absorber and a solar power generation system.

Background

Solar energy is a green and sustainable clean energy source, and therefore, the solar energy can become an ideal energy source in the future. The solar thermal power generation is matched with a large-scale low-price energy storage technology, so that the power output is smooth, stable and schedulable, and the solar thermal power generation has a wide application prospect.

The solid particle heat absorption and storage technology is a novel solar heat absorption and storage technology, is one of mainstream technologies of third-generation tower-type photo-thermal power generation research, and has the following main advantages: the solid particles can meet the requirements of heat absorption, heat transfer and heat storage at the same time; the cost of the particles is low; the heat absorption temperature of the particles is high and can reach 1000 ℃; the storage and the transportation of the particles do not need to adopt expensive metal materials, so that the equipment cost is reduced.

The particle heat absorber can be classified into a direct heating type and an indirect heating type according to a method of heating the particles by solar energy. The heat absorber of indirect heating type has low thermal efficiency, the existing mainstream technology is to directly heat particles by using solar energy, and the ceramic particles are used as heat absorbing media, so that the heat conducting performance of the particles is poor and only 1.2 w/m.k, and the particles fall freely in the heat absorber by virtue of gravity, so that the falling speed is high, and the heat absorbing efficiency of the particles is low. Meanwhile, the particles are unevenly heated in the heat absorber, the temperature of the side directly irradiated by sunlight is higher, the backlight temperature is lower, and the temperature unevenness is obvious.

Disclosure of Invention

The invention aims to provide a particle heat absorber to solve the problem of low heat absorption efficiency of the existing particle heat absorber.

In order to solve the problems, the technical scheme of the invention is as follows:

the particle heat absorber comprises a heat absorber body, wherein at least one heat absorbing pipe is arranged in the heat absorber body, and the particle heat absorber is characterized by further comprising a gas supply part;

the gas supply part is communicated with the bottom of the heat absorption pipe and is used for supplying gas which flows from bottom to top into the heat absorption pipe.

The particle heat absorber is characterized in that at least one flow blocking piece is arranged in the heat absorbing pipe, and the position of one end of the flow blocking piece on the light receiving side is lower than that of one end of the flow blocking piece on the backlight side in the height direction.

According to the particle heat absorber, the flow choking piece is a hollow flow choking column, the hollow flow choking column comprises an air inlet and an air outlet, the air inlet of the hollow flow choking column is arranged at the lower part of one end of the hollow flow choking column on the light receiving side, and the air outlet of the hollow flow choking column is arranged at the upper part of one end of the hollow flow choking column on the backlight side.

According to the particle heat absorber, the hollow flow blocking columns are sequentially arranged in the heat absorbing pipe from top to bottom, and the projections of two adjacent hollow flow blocking columns in the vertical direction are not overlapped.

According to the particle heat absorber, the air outlet is provided with the air outlet holes, and the size of each air outlet hole is smaller than that of a particle.

According to the particle heat absorber, the hollow flow blocking column is provided with a plurality of bulges on the outer wall surface of the edge of the air outlet.

In the particle heat absorber, the upward inclined angle of the flow resisting piece is 30-40 degrees.

The particle heat absorber of the present invention is characterized in that the gas supply unit includes a gas pipe and a gas drive unit attached to the gas pipe;

one end of the gas pipeline is communicated with the bottom of the heat absorption pipe, and the other end of the gas pipeline is communicated with the top of the heat absorption pipe.

The particle heat absorber of the invention comprises a heat absorber body, a heat absorber shell and a heat absorber body, wherein the heat absorber body comprises a heat absorber shell; each heat absorption pipe is arranged around the inner wall of the heat absorber shell.

According to the particle heat absorber, the heat absorber body comprises a hopper, a buffer tank and a heat absorber shell which are sequentially communicated along the particle flowing direction.

The invention also provides a solar power generation system comprising the particle heat absorber.

Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:

1. according to the embodiment of the invention, the gas supply part is communicated with the heat absorption pipe, the gas supply part provides airflow from bottom to top into the heat absorption pipe, and the airflow and the particles form reverse flow, so that the effect of reducing the falling speed of the particles can be achieved, the retention time of the particles in the heat absorption pipe is prolonged, the heat exchange time is prolonged, the heat absorption efficiency of the particles is improved, and the problem of low heat absorption efficiency of the existing particle heat absorber is solved.

2. In one embodiment of the invention, the airflow from bottom to top can absorb the heat in the particle heat exchange channel in the flowing process, and the heated gas can continuously rise and contact with the particles, so that the convective heat exchange with the particles can be enhanced, and the heat exchange efficiency of the particles is improved.

3. In one embodiment of the invention, the heat absorption tube is further provided with the flow choking parts which are obliquely arranged, the light receiving side of each flow choking part is lower than the backlight side of the flow choking part, and when particles fall down, the flow choking parts can guide the particles on the backlight side to the light receiving side, so that more particles can absorb heat on the light receiving side, and the heat exchange efficiency of the particles and the balance of the temperature of the particles are improved.

4. In one embodiment of the invention, the hollow flow blocking column is arranged in the heat absorbing pipe, and the hollow flow blocking column guides the gas positioned on the light receiving side of the heat absorbing pipe from bottom to top to the backlight side of the heat absorbing pipe from bottom to top, so that the gas flow on the light receiving side is reduced, and the gas flow on the backlight side is increased. Therefore, the falling speed of the particles on the light receiving side is higher than that of the particles on the backlight side, and the falling speed of the particles on the backlight side is further reduced, so that the particles on the backlight side have longer residence time to absorb heat to raise the temperature of the particles on the backlight side, and further the temperature of the particles on the light receiving side and the temperature of the particles on the backlight side tend to be consistent.

5. In one embodiment of the invention, the hollow flow blocking columns are sequentially arranged in the heat absorbing pipe from top to bottom, and the projections of the adjacent hollow flow blocking columns in the vertical direction are not overlapped, namely, the hollow flow blocking columns are staggered when viewed from the upper part to the lower part of the heat absorbing pipe, so that the particles falling freely are blocked, the descending speed is delayed, the heat exchange is enhanced, the particles at the backlight side can be better guided to the light receiving side, and the heat exchange efficiency of the particles is further improved.

6. According to the embodiment of the invention, the bulge is arranged on the peripheral side of the air outlet, so that the air outlet can be prevented from being blocked by falling particles.

7. According to the embodiment of the invention, the gas supply part is the gas pipeline and the gas driving unit, and two ends of the gas pipeline are respectively communicated with the heat absorption pipe, so that the gas in the heat absorber body can be circulated, and the problem of heat absorption efficiency reduction caused by the entry of external cold air is avoided.

Drawings

FIG. 1 is a schematic view of a particulate heat sink of the present invention;

fig. 2 is a schematic layout of the absorber tubes of the particulate heat absorber of the present invention;

fig. 3 is a schematic view of the arrangement of hollow choked flow posts of the particulate heat absorber of the present invention;

FIG. 4 is a schematic transverse cross-sectional view of a hollow flow-blocking column of the particulate heat sink of the present invention;

fig. 5 is a schematic longitudinal cross-section of a hollow flow-blocking column of a particulate heat sink of the present invention.

Description of reference numerals: 1: a hopper; 2: a buffer tank; 3: a heat absorbing tube; 4: a hollow flow-blocking column; 401: an air inlet; 402: an air outlet; 403: a protrusion; 5: a heat absorber housing; 6: a gas line; 7: a gas driving unit; 8: an electric gate valve; 9: a heliostat.

Detailed Description

The particulate heat absorber and the solar power generation system according to the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will become apparent from the following description and from the claims.

Example one

Referring to fig. 1, in one embodiment, a particulate heat sink includes a heat sink body and a gas supply. Wherein, the heat absorber body is internally provided with at least one heat absorption pipe. The output end of the gas supply part is communicated with the bottom of the heat absorption pipe and is used for supplying gas which flows from bottom to top into the heat absorption pipe.

This embodiment is through setting up gaseous supply portion in the exit of heat-absorbing pipe, provides the air current from bottom to top in to the heat-absorbing pipe by gaseous supply portion, and the air current forms reverse flow with the granule, can play the effect that reduces granule falling speed for the residence time extension of granule in the heat-absorbing pipe, the heat transfer time extension improves the heat absorption efficiency of granule, has solved the problem that current granule heat absorber heat absorption efficiency is low.

Meanwhile, the airflow from bottom to top can absorb the heat in the heat absorbing pipe in the flowing process, and the heated gas can continuously rise and contact with the particles, so that the convective heat transfer with the particles can be enhanced, and the heat transfer efficiency of the particles is improved.

The specific structure of the particulate heat absorber of this embodiment is further described below:

in this embodiment, referring to fig. 2, the heat sink body may specifically include a hopper 1, a buffer tank 2, and a heat sink housing 5 that are sequentially communicated in the particle falling direction. The heat absorption pipes 3 are arranged in the vertical direction, and the plurality of heat absorption pipes 3 can be respectively arranged along the inner wall surface of the heat absorber shell 5 in a surrounding manner, so that a ring of pipe panels surrounding the heat absorber shell 5 is formed.

Further, an electric gate valve 8 can be arranged at the connection of the hopper 1 and the buffer tank 2. Solid particles enter the hopper 1, and after a certain amount of particles in the hopper 1 is reached, the electric gate valve 8 is opened, so that the particles can enter the buffer tank 2.

In the present embodiment, the gas supply portion is specifically provided as a gas pipe 6 and a gas driving unit 7 mounted on the gas pipe 6. The gas driving unit 7 may be a blower. The input of gas pipeline 6 sets up to communicate in the inner chamber of buffer tank 2, and the output of gas pipeline 6 communicates in the exit of heat absorber casing 5 for provide gas in to heat-absorbing pipe 3, thereby make the heat absorber body can realize the circulation with the gas in the buffer tank 2, avoid outside cold air to get into the problem that leads to the heat absorption efficiency to reduce. Of course, when the electric gate valve 8 is opened, a small amount of internal gas flows out, but the outflow amount is small, and meanwhile, the flowing-out gas can also preheat the particles in the hopper 1 to a certain degree.

In the present embodiment, referring to fig. 3 and 4, at least one flow blocking member is further disposed in the inner wall surface of each heat absorbing pipe 3. The position of the choke at the light receiving side end is lower in the height direction than the position thereof at the backlight side end. That is, the choker is obliquely arranged, the light receiving side is lower than the backlight side, and when particles fall down, the choker can guide the particles on the backlight side to the light receiving side, so that more particles can absorb heat on the light receiving side, and the heat exchange efficiency of the particles and the balance of the temperature of the particles are improved.

Further, the flow resisting element may be a hollow flow resisting column 4. The hollow current-blocking column 4 comprises an air inlet 401 and an air outlet, the air inlet 401 of the hollow current-blocking column 4 is arranged at the lower part of one end of the hollow current-blocking column 4 at the light receiving side, and the air outlet of the hollow current-blocking column 4 is arranged at the upper part of one end of the hollow current-blocking column 4 at the backlight side. The hollow flow blocking column 4 can guide the gas positioned on the light receiving side of the heat absorbing tube 3 from bottom to top to the backlight side of the heat absorbing tube 3 from bottom to top, so that the gas flow on the light receiving side is reduced, and the gas flow on the backlight side is increased. Therefore, the falling speed of the particles on the light receiving side is higher than that of the particles on the backlight side, and the falling speed of the particles on the backlight side is further reduced, so that the particles on the backlight side have longer residence time to absorb heat, the temperature of the particles on the backlight side is increased, and the temperature of the particles on the light receiving side and the temperature of the particles on the backlight side are further ensured to be consistent.

Specifically, referring to fig. 5, the hollow flow-blocking columns 4 are sequentially arranged in the heat absorption tube from top to bottom, and projections of two adjacent hollow flow-blocking columns 4 in the vertical direction are not overlapped, that is, when viewed from above the heat absorption tube, the hollow flow-blocking columns 4 are staggered, so that particles on the backlight side can be better guided to the light receiving side, and the heat exchange efficiency of the particles is further improved. Simultaneously, the income wind gap 401 and the air outlet of hollow current blocking post 4 can be a plurality of inlet openings and exhaust vent 402 of evenly arranging respectively, and the diameter of exhaust vent 402 needs to be less than the diameter of granule, avoids the granule to fall into, and the mode that a plurality of exhaust vents 402 set up for gas flow's guide is more even, has realized the guide of bigger gas flow simultaneously, and the effect is better.

Furthermore, a plurality of hemispherical protrusions 403 can be arranged on the outer wall surface of the hollow flow blocking column 4 on the periphery of the air outlet 402, which is beneficial to reducing the situation that the air outlet 402 is blocked by falling particles.

Further, the hollow current-blocking column 4 may be inclined upward around the circumference at an angle of 30 ° to 40 °. In other embodiments, the tilt angle is not limited to the above values, and can be adjusted according to different practical application scenarios.

The flow of the particulate heat absorber of this embodiment is further described below: under the action of the heliostat 9, sunlight beams are intensively irradiated on the heat absorption tube 3, and the light receiving side illumination effect of the heat absorption tube 3 is better than that of the backlight side.

Solid particles enter the hopper 1, after a certain amount of particles in the hopper 1 are reached, the electric gate valve 8 is opened, the particles enter the buffer tank 2 and then fall into each heat absorption pipe 3 from top to bottom; in the heat absorption pipe 3, the particles on the light receiving side and the particles on the backlight side absorb heat respectively under the action of different flow gases, and the heated high-temperature particles pass through the outlet of the heat absorber shell 5 and are guided by the connected discharge pipe to enter the lower-end high-temperature particle storage tank.

Example two

A solar power generation system comprising the particulate heat absorber of the first embodiment. The gas supply part is communicated with the outlet of the heat absorption pipe in the heat absorber body or the outlet of the heat absorption pipe in the heat absorber body, airflow from bottom to top is provided in the particle heat exchange channel by the gas supply part, the airflow and the particles form reverse flow, the effect of reducing the falling speed of the particles can be played, the detention time of the particles in the particle heat exchange channel is prolonged, the heat exchange time is prolonged, the heat absorption efficiency of the particles is improved, and the problem of low heat absorption efficiency of the existing particle heat absorber is solved.

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, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.