CN112797648A

CN112797648A - Novel high-temperature solid particle heat absorber and system

Info

Publication number: CN112797648A
Application number: CN202110162805.6A
Authority: CN
Inventors: 李黄成; 齐志鹏; 王帅
Original assignee: Shouhang High Tech Energy Technology Co ltd
Current assignee: Shouhang High Tech Energy Technology Co ltd
Priority date: 2021-02-05
Filing date: 2021-02-05
Publication date: 2021-05-14

Abstract

The invention provides a novel high-temperature solid particle heat absorber and a system, which relate to the technical field of solar thermal power generation, can realize the heating of solid particles, can also realize the controllability of heating temperature and heating time, and improve the stability of the heat absorber; this heat absorber includes: a support frame for mounting and fixing the other part of the heat absorber; a feeding hopper for adding solid particles to be heated; the particle flow passage is used for shunting solid particles to be heated; the tube panel is used for heating the solid particles; a particle collector for collecting and storing the heated solid particles; the temperature monitoring system is used for monitoring the real-time temperature of the solid particles at different positions; the feeding hopper, the particle flow channel, the tube panel and the particle collector are connected in sequence. The technical scheme provided by the invention is suitable for the process of heating solid particles.

Description

Novel high-temperature solid particle heat absorber and system

Technical Field

The invention relates to the technical field of solar thermal power generation, in particular to a novel high-temperature solid particle heat absorber and a system.

Background

Along with the coal,The gradual exhaustion and pollution of resources such as oil, natural gas and the like, and the proportion of clean energy resources occupied in the production and the life of human beings is getting larger and larger. In supercritical CO₂In a solar thermal power generation project, one of indispensable devices is a heat absorber. The existing high-temperature particle heat absorber is mostly in a free-falling type, and the heat absorber can achieve the heating purpose by irradiating sunlight on free-falling solid particles, but has defects in the aspects of stability and controllability.

Accordingly, there is a need to develop a new high temperature solid particulate heat absorber and system that addresses the deficiencies of the prior art to solve or mitigate one or more of the problems set forth above.

Disclosure of Invention

In view of this, the invention provides a novel high-temperature solid particle heat absorber and a system, which can not only heat solid particles, but also control heating temperature and heating time, and improve the stability of the heat absorber.

In one aspect, the present invention provides a novel high temperature solid particulate heat absorber, comprising:

a support frame for mounting and fixing the other part of the heat absorber;

a feeding hopper for adding solid particles to be heated;

the particle flow passage is used for shunting solid particles to be heated;

the tube panel is used for heating the solid particles;

a particle collector for collecting and storing the heated solid particles;

the feeding hopper, the particle flow channel, the tube panel and the particle collector are connected in sequence.

The above-described aspects and any possible implementation manner further provide an implementation manner, where the heat absorber further includes a main control module and a temperature detection system; the temperature detection system is used for monitoring the real-time temperatures of the solid particles at different positions, and the main control module is used for processing and analyzing the real-time temperatures monitored by the temperature detection system and controlling the flow of the solid particles according to the analysis result.

The above-described aspects and any possible implementations further provide an implementation in which the temperature detection system includes a plurality of temperature sensors disposed in respective portions of the heat sink, including the panel outlet, the particle collector, and the loading hopper.

The above aspect and any possible implementation further provide an implementation in which the outlet of the upper hopper is provided with an on-off valve.

In accordance with the above aspect and any possible implementation manner, there is further provided an implementation manner in which the particle flow channel is disposed obliquely, and a plurality of flow dividing partitions are disposed at the bottom of the particle flow channel.

The above aspect and any possible implementation manner further provide an implementation manner, in which the tube panel includes a plurality of tube groups made of a high light transmittance material and arranged in parallel, and each of the tube groups is provided with a channel for solid particles to pass through.

The above aspect and any possible implementation further provide an implementation in which the tube set includes an inner tube and an outer tube coaxially disposed with the channel therebetween.

There is further provided in accordance with the above-described aspect and any possible implementation, an implementation in which the channel is semi-circular in cross-section.

The above aspects and any possible implementations further provide an implementation, where the semi-circular ring is a less-half circular ring, a more-half circular ring, or a regular semi-circular ring.

The above aspect and any possible implementation further provide an implementation in which the bottom end of the tube set is provided with a filter, and the bottom of the filter is connected to the particle collector.

The above aspect and any possible implementation further provide an implementation in which the bottom of the filter is provided with a control valve for controlling the flow rate of solid particles.

In the aspect and any possible implementation manner described above, an implementation manner is further provided, in which the main control module is connected to the switch valve and the control valve respectively, and controls the opening and closing degrees of the switch valve and the control valve. The flow control device includes not only the above-described on-off valve and control valve but also devices for controlling the flow of the solid particles provided at other positions as the case may be.

The above aspects and any possible implementations further provide an implementation in which the filter includes a filter inner tube and a filter outer tube connected to the inner tube and the outer tube of the corresponding tube set, respectively; and a channel for solid particles to pass through is arranged between the filter inner tube and the filter outer tube.

The above-described aspects and any possible implementations further provide an implementation in which the filter is a tapered filter comprising a cylindrical portion and a conical portion; the cylindrical part comprises an inner pipe and an outer pipe, and a channel is arranged between the inner pipe and the outer pipe; the conical part only comprises an outer pipe, and the inner cavity of the outer pipe is used as a channel for solid particles; the bottom of the inner pipe of the cylindrical part is higher than the bottom of the outer pipe, and a gap for solid particles to pass through is reserved between the bottom of the inner pipe and the bottom of the outer pipe.

In another aspect, the present invention provides a high temperature solid particle heat absorption system, wherein the system comprises a heat absorber as described above and several mirrors; the reflector is used for reflecting sunlight to the tube panel to heat solid particles in the tube panel.

Compared with the prior art, the invention can obtain the following technical effects: the heating of solid particles can be realized, and the heating is more uniform and stable through the arrangement of the semi-circular tube panel channel; the obliquely arranged particle flow channel is used for shunting, and the switching valve is arranged, so that the flow velocity of solid particles can be controlled, and the particle entering speed and state can be conveniently and timely adjusted according to the illumination intensity and temperature feedback; the setting of filter tip and control valve can adjust the heating time of granule in the pipe screen, is convenient for adjust according to actual conditions such as illumination intensity and temperature monitoring data equally to guarantee that all solid particles after the heating can both reach the temperature of expectation.

Of course, it is not necessary for any one product in which the invention is practiced to achieve all of the above-described technical effects simultaneously.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

FIG. 1 is a block diagram of a high temperature solid particulate heat sink provided by one embodiment of the present invention;

fig. 2 is a diagram of the operation of a high temperature solid particulate heat sink according to an embodiment of the present invention;

FIG. 3 is a schematic view of a flow channel structure provided by an embodiment of the present invention;

FIG. 4 is a schematic diagram of a tube panel configuration provided by one embodiment of the present invention;

FIG. 5 is a top cross-sectional view of a tube panel provided by one embodiment of the present invention;

FIG. 6 is a schematic diagram of a filter construction provided by one embodiment of the present invention;

FIG. 7 is a schematic diagram of the operational structure of a filter according to an embodiment of the present invention;

fig. 8 is a distribution diagram of temperature sensors in a temperature monitoring system according to an embodiment of the present invention.

Wherein, in the figure:

1. a support frame; 2. feeding a hopper; 3. a particle inlet; 4. an on-off valve; 5. a flow channel; 6. an upper header; 7. a tube panel; 8. a lower header; 9. a particle collector; 10. a particle outlet; 11. a filter tip; 12. a temperature sensor;

501. a flow dividing partition plate; 701. an inner tube; 702 a jacket; 703. an outer tube; 704. a particle channel; 705. a cushion layer; 706. a snap ring; 1101. an outer pipe bracket; 1102. an inner pipe bracket; 1103. a filter tip outlet; 1104. a cylindrical portion; 1105. a conical section; 1106. and (4) controlling the valve.

Detailed Description

For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.

It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

The high-temperature solid particle heat absorber provided by the invention can not only realize the heating purpose, but also has the stable and controllable characteristic on the basis of the original equipment. When the illumination condition is superior, the regulating valve can be opened to be large correspondingly according to the feedback of the temperature monitoring data, and the flow velocity of the particles is improved to meet the requirement of the outlet temperature of 700 ℃; under the condition of poor illumination condition, according to the condition of temperature monitoring data feedback, correspondingly reducing the opening of the regulating valve, and ensuring that the stay time of the particles in the pipe is long enough to reach the outlet temperature of 700 ℃.

The high-temperature solid particle heat absorber is shown in fig. 1 and comprises a supporting frame 1, an upper hopper 2, a switching valve 4, a flow channel 5, an upper header 6, a tube panel 7, a lower header 8 and a particle collector 9. Wherein, a supporting frame 1 is fixed on a workbench, a feeding hopper 2 is arranged at the upper part of the supporting frame 1, and a particle inlet 3 is arranged above the feeding hopper and used for the entering of particles to be heated. The lower part of the feeding hopper is provided with a feeding hopper outlet which is communicated with the upper end of the flow passage 5 through the switch valve 4, so that the particles flowing out of the feeding hopper flow into the flow passage 5 at a certain flow rate under the control of the switch valve 4. The lower part of the flow channel 5 is communicated with the upper end of a tube panel 7 through an upper header 6, the lower end of the tube panel 7 is communicated with a particle collector 9 through a lower header 8, and the bottom of the particle collector 9 is provided with a particle outlet 10. The feeding hopper 2, the flow channel 5, the tube panel 7 and the particle collector 9 are all fixed on the supporting frame 1 and are detachably connected.

The feeding hopper 2 is of a wedge-shaped hollow structure, 9 temperature sensors are arranged on the side surface in a layered mode, a strip-shaped feeding hopper outlet or a plurality of small outlets which are sequentially arranged is arranged on the bottom plane of the feeding hopper, and a switch valve 4 is arranged at each outlet and used for controlling the discharge and inflow speed of particles. The runner 5 is a hollow straight parallelepiped with two open ends, the whole is placed in an inclined state of 45 degrees, the upper end opening is connected with the outlet of the feeding hopper, 19 shunting partition plates 501 are uniformly paved at the bottom, and the lower end opening is communicated with the tube panel 7 through an upper header 6. The connection process needs to be careful about the level and alignment of the joints so as to ensure that the particles can uniformly flow into each quartz tube, thereby ensuring the uniformity and high efficiency of heating.

The upper header is arranged at the upper end part of the tube panel 7 and is of a strip-shaped hollow structure integrally, the upper header is divided into a plurality of sub headers by adopting partition plates, and each sub header is connected with a corresponding sleeve (namely a quartz glass tube in the tube panel 7).

The tube panel 7 is constructed as shown in fig. 4 and 5. The tube panel is composed of multiple groups (20 groups are commonly used) of quartz glass tubes with high transmittance, each group of quartz tubes is divided into an inner tube 701 and an outer tube 703, the outer diameter of the inner tube 701 is 90mm, the wall thickness is 5mm, the outer diameter of the outer tube 703 is 110mm, the wall thickness is 5mm, the inner tube and the outer tube are concentrically arranged, a gap of 5mm is formed between the outer wall of the inner tube 701 and the inner wall of the outer tube 703, a high-temperature-resistant cushion layer 705 (the cushion layer is high-temperature-resistant high-silica glass fiber paper) is plugged into the shady surface of the annular gap of 5mm, the cushion layer is fixed by a snap ring 706, only a semicircular particle channel 704 with a positive surface (namely a sunlight receiving surface) is reserved, and low-temperature. The semi-annular shape of the present invention does not refer to a semi-circle in an absolute sense (i.e., a positive semi-circle, with the arc angle of 180 °), and the channels may be less than semi-circles (with the arc angle of less than 180 °) or more than semi-circles (with the arc angle of more than 180 °) as desired.

At the outlet of the tube panel 7, i.e. the lower end of the quartz tube assembly, a cone filter 11 is attached (the structure of the cone filter is shown in fig. 6). The external structure of the conical filter comprises an upper cylindrical part 1104, a lower conical part 1105 and a filter outlet 1103, wherein a small temperature sensor is fixed on the side wall of the conical part 1105; internal structure an outer pipe bracket 1101 and an inner pipe bracket 1102. The outer tube holder 1101, the inner tube holder 1102 and the housing are all coaxially arranged. The outer tube holder 1101 has the same outer diameter and thickness as the outer tube 703 and is used for supporting the outer tube 703; the inner pipe holder 1102 has the same outer diameter and thickness as the inner pipe 701, and supports the inner pipe 701. The gap between the inner pipe bracket and the outer pipe bracket is always kept unchanged, and the outer shell and the limiting pin are used for limiting the inner pipe 701 and the outer pipe 703 respectively, so that the annular channel can be ensured to be kept at 5mm consistently.

The lower portion of the tapered filter 11 is fixed to the upper bottom surface of the lower header 8, and as shown in fig. 7, a filter outlet 1103 is provided with a control valve 1106. The lower part of the lower header 8 is in direct communication with the particle collector 9. The particle collector 9 is a large-space storage tank made of high-temperature-resistant stainless steel, and the tank body is designed into an eccentric funnel shape, so that high-temperature solid particles can be emptied quickly, and heat loss in the flowing process is reduced; the outer surface has heat preservation, and the heat preservation effect is good; the inner side of the device is provided with 9 temperature sensors in a layered mode, and the temperature of solid particles at different positions is monitored. The distribution of the temperature sensors is shown in fig. 8.

In operation, low temperature solid particles (ceramic particles with a particle size of 0.2mm to 0.9 mm) at about 500 ℃ are conveyed to the particle inlet 3 by the elevator and poured into the feeding hopper 2. In the state that the valve of the on-off valve 4 is opened, the low-temperature solid particles fall into the particle flow passage 5, and are uniformly distributed into the branch headers through the flow division of the flow dividing partition plate 501, as shown in fig. 3. The low temperature solid particles entering the upper header gradually accumulate and flow into the annular channel of the tube panel 7.

In the semi-annular channel 704, the temperature of the low temperature solid particles gradually increases as the concentrated sunlight is absorbed. The solid particles after temperature rise flow through the filter tip and a temperature sensor at the filter tip. According to the temperature data fed back by the thermocouple, the opening degree of the filter outlet valve 1106 is adjusted, so that high-temperature particles flow into the lower header 8 and directly fall into the particle collector 9.

The high temperature particles entering the particle collector are monitored by a temperature monitoring system, and if the particles do not reach the expected temperature, the particles are conveyed into a bin of the elevator, transported to the particle inlet 3 again and heated again; if the particles reach the expected temperature, the particles are conveyed to other equipment for heat exchange, and after the heat exchange is finished and the particles become low-temperature solid particles, the particles are conveyed to a storage bin of a hoister, conveyed to a particle inlet 3 and reheated. The above steps are repeated in a circulating way.

The device consists of an outer supporting frame and an equipment body, and because the temperature environment and the stress state of each part are different, the adopted materials and the adopted section bars are different. The supporting frame is a main force bearing part, the environment temperature of the outer frame is not higher than 80 ℃, the supporting frame is made of H-shaped steel of Q235B through welding, the temperature of the part which is in direct contact with the feeding hopper 2, the upper header 6, the lower header 8 and the particle collector 9 is about 400 ℃, and the supporting frame is made of high-temperature resistant stainless steel of 316. The upper low-temperature part of the equipment body is in a temperature environment of about 500 ℃, and the feeding hopper, the flow channel and the upper header can be made of 316 stainless steel plates; the lower high-temperature part is located at the environment temperature of above 700 ℃, and the lower header and the particle collector are made of high-temperature-resistant 310s stainless steel plates. The connecting parts are movably connected through bolts, so that the reliability in a high-temperature state can be guaranteed, the local stress generated by the deformation of equipment under a huge temperature difference can be greatly reduced, and the deformation or damage of the equipment is prevented.

The outer surface of the equipment body can be wrapped by a layer of high-temperature-resistant ceramic fiber cotton, so that the heat loss of the device is reduced, the working efficiency is improved, the contact temperature of the outer surface of the equipment is not more than 50 ℃, and the safety of workers is guaranteed.

The above details are provided for a novel high-temperature solid particle heat absorber and system provided by the embodiments of the present application. The above description of the embodiments is only for the purpose of helping to understand the method of the present application and its core ideas; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

As used in the specification and claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.

It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the application as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.

Claims

1. A novel high temperature solid particulate heat absorber, comprising:

a support frame for mounting and fixing the other part of the heat absorber;

a feeding hopper for adding solid particles to be heated;

the particle flow passage is used for shunting solid particles to be heated;

the tube panel is used for heating the solid particles;

a particle collector for collecting and storing the heated solid particles;

2. The new high temperature solid particulate heat absorber according to claim 1, wherein the outlet of the upper hopper is provided with an on-off valve.

3. The novel high-temperature solid particle heat absorber as claimed in claim 1, wherein the particle flow passage is inclined, and the bottom of the particle flow passage is provided with a plurality of flow dividing partitions.

4. The novel high-temperature solid particle heat absorber of claim 1, wherein the tube panel comprises a plurality of tube groups made of a high-transmittance material and arranged side by side, and each tube group is provided with a passage for solid particles to pass through.

5. The new high temperature solid particulate heat sink according to claim 4, wherein the tube bank includes coaxially disposed inner and outer tubes with the passageway therebetween.

6. The new high temperature solid particulate heat sink according to claim 5, wherein the cross section of the passageway is semi-circular.

7. The novel high-temperature solid particle heat absorber of claim 1, further comprising a master control module and a temperature detection system; the temperature detection system is used for monitoring the real-time temperatures of the solid particles at different positions, and the main control module controls the flow of the solid particles according to the real-time temperatures monitored by the temperature detection system.

8. The new high temperature solid particulate heat absorber of claim 4, wherein the bottom end of the tube bank is provided with a filter, and the bottom of the filter is connected to the particulate collector.

9. The novel high-temperature solid particle heat absorber according to claim 8, wherein the bottom of the filter is provided with a control valve for controlling the flow of the solid particles.

10. A high temperature solid particulate heat absorption system comprising the heat absorber of any of claims 1-9 and a plurality of mirrors; the reflector is used for reflecting sunlight to the tube panel to heat solid particles in the tube panel.