U.S. patent application number 13/981127 was filed with the patent office on 2013-11-21 for dish-type solar thermal power generation system and heat collector thereof.
This patent application is currently assigned to XIANGTAN ELECTRIC MANUFACTURING CO., LTD.. The applicant listed for this patent is Anwang Dang, Min Huang, Bugen Wang, Shuhui Wang, Kai Zhu. Invention is credited to Anwang Dang, Min Huang, Bugen Wang, Shuhui Wang, Kai Zhu.
Application Number | 20130306059 13/981127 |
Document ID | / |
Family ID | 47138785 |
Filed Date | 2013-11-21 |
United States Patent
Application |
20130306059 |
Kind Code |
A1 |
Wang; Shuhui ; et
al. |
November 21, 2013 |
Dish-Type Solar Thermal Power Generation System And Heat Collector
Thereof
Abstract
A heat collector of a dish-type solar thermal power generation
system and the solar thermal power generation system having the
heat collector. The heat collector of the dish-type solar thermal
power generation system comprises a heat collecting cavity and at
least one layer of heat absorbing coil. The heat collecting cavity
is provided with an opening. The heat absorbing coil forms a cavity
structure. The cavity structure is provided with a hole. The cavity
structure is arranged within the heat collecting cavity. The hole
and the opening are aligned. A low temperature inlet of the heat
absorbing coil is arranged on the cavity structure at a location
where incident light energy distribution density is at maximum. The
heat collector is capable of preventing ablation of the heat
absorbing coil due to localized overheating and burning of the heat
collector due to abrupt drop in convective heat transfer
coefficient caused by phase transition of working fluid.
Inventors: |
Wang; Shuhui; (Xiangtan,
CN) ; Wang; Bugen; (Xiangtan, CN) ; Dang;
Anwang; (Xiangtan, CN) ; Zhu; Kai; (Xiangtan,
CN) ; Huang; Min; (Xiangtan, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Wang; Shuhui
Wang; Bugen
Dang; Anwang
Zhu; Kai
Huang; Min |
Xiangtan
Xiangtan
Xiangtan
Xiangtan
Xiangtan |
|
CN
CN
CN
CN
CN |
|
|
Assignee: |
XIANGTAN ELECTRIC MANUFACTURING
CO., LTD.
Xiangtan, Hunan
CN
|
Family ID: |
47138785 |
Appl. No.: |
13/981127 |
Filed: |
April 26, 2012 |
PCT Filed: |
April 26, 2012 |
PCT NO: |
PCT/CN12/74735 |
371 Date: |
July 23, 2013 |
Current U.S.
Class: |
126/674 ;
126/651; 126/709 |
Current CPC
Class: |
F24S 23/71 20180501;
Y02E 10/40 20130101; F24S 40/55 20180501; F24S 80/60 20180501; Y02E
10/44 20130101; F24S 20/20 20180501; F24S 10/755 20180501; F24S
80/40 20180501; F24S 10/754 20180501; F24S 10/75 20180501 |
Class at
Publication: |
126/674 ;
126/651; 126/709 |
International
Class: |
F24J 2/26 20060101
F24J002/26; F24J 2/46 20060101 F24J002/46 |
Claims
1. A heat collector for a dish solar thermal power generation
system, comprising a heat collecting chamber and at least one layer
of heat absorbing coil, wherein the heat collecting chamber has an
opening portion; the heat absorbing coil forms a cavity structure
with a hole, the cavity structure being placed inside the heat
collecting chamber such that the hole is aligned with the opening
portion; and wherein the heat absorbing coil has a low-temperature
inlet provided at a part with a maximum solar radiation energy
density of the cavity structure.
2. The heat collector according to claim 1, wherein at least two
layers of the heat absorbing coil are provided.
3. The heat collector according to claim 2, wherein there is a
preset clearance between adjacent layers of the heat absorbing
coil.
4. The heat collector according to claim 1, wherein a heat
absorbing rib is provided on an outer wall of the heat absorbing
coil.
5. The heat collector according to claim 4, wherein the heat
absorbing rib is a straight rib or a helical rib.
6. The heat collector according to claim 1, wherein the heat
collecting chamber comprises an inner shell, an outer shell and a
front covering plate, wherein the inner shell has an inner wall
defining an inner wall of the heat collecting chamber; the outer
shell is disposed outside of the inner shell; the front covering
plate forms the opening portion of the heat collecting chamber; the
inner shell and the outer shell are fixed relative to the front
covering plate, and a thermal insulation layer is provided between
the inner shell, the outer shell and the front covering plate.
7. The heat collector according to claim 6, wherein a transparent
covering plate is provided at the opening portion.
8. The heat collector according to claim 6, wherein the front
covering plate is provided thereon with a cooling sheath for
circulation of cooling medium.
9. The heat collector according to claim 8, wherein the cooling
sheath has a cooling-medium outlet in communication with the
low-temperature inlet of the heat absorbing coil.
10. The heat collector according to claim 6, wherein the inner wall
of the heat collecting chamber is provided with a reflective
coating.
11. The heat collector according to claim 6, wherein the inner
shell and the outer shell each are formed by a plurality of
segments, and the plurality of segments are connected by a flange
or a fastener to form an integral structure.
12. The heat collector according to claim 1, wherein the cavity
structure is of a spherical crown shape, or an inverted conical
frustum shape.
13. A dish solar thermal power generation system, comprising a
condensing dish, a heat exchanger and the heat collector according
to claim 1.
14. The dish solar thermal power generation system according to
claim 13, wherein at least two layers of the heat absorbing coil
are provided.
15. The dish solar thermal power generation system according to
claim 14, there is a preset clearance between adjacent layers of
the heat absorbing coil.
16. The dish solar thermal power generation system according to
claim 13, wherein a heat absorbing rib is provided on an outer wall
of the heat absorbing coil.
17. The dish solar thermal power generation system according to
claim 16, wherein the heat absorbing rib is a straight rib or a
helical rib.
18. The dish solar thermal power generation system according to
claim 13, wherein the heat collecting chamber comprises an inner
shell, an outer shell and a front covering plate, wherein the inner
shell has an inner wall defining an inner wall of the heat
collecting chamber; the outer shell is disposed outside of the
inner shell; the front covering plate forms the opening portion of
the heat collecting chamber; the inner shell and the outer shell
are fixed relative to the front covering plate, and a thermal
insulation layer is provided between the inner shell, the outer
shell and the front covering plate.
19. The dish solar thermal power generation system according to
claim 18, wherein the inner shell and the outer shell each are
formed by a plurality of segments, and the plurality of segments
are connected by a flange or a fastener to form an integral
structure.
20. The dish solar thermal power generation system according to
claim 13, wherein the cavity structure is of a spherical crown
shape, or an inverted conical frustum shape.
Description
[0001] The present application claims priority to Chinese Patent
Application No. 201110118565.6, filed with the Chinese Patent
Office on May 9, 2011 and entitled "DISH-TYPE SOLAR THERMAL POWER
GENERATION SYSTEM AND HEAT COLLECTOR THEREOF", which is hereby
incorporated by reference in its entirety.
[0002] The present application claims priority to Chinese Patent
Application No. 201120144531.X, filed with the Chinese Patent
Office on May 9, 2011 and entitled "DISH-TYPE SOLAR THERMAL POWER
GENERATION SYSTEM AND HEAT COLLECTOR THEREOF", which is hereby
incorporated by reference in its entirety.
FIELD OF THE INVENTION
[0003] The present application relates to the technical filed of
solar thermal power generation system, and particularly to a heat
collector for a dish solar thermal power generation system. The
present invention further relates to a solar thermal power
generation system having the above heat collector.
BACKGROUND OF THE INVENTION
[0004] Energy source is an important foundation of development of
economy and society. Since the industrial revolution, consumption
of energy source in the world has significantly increased;
traditional fossil energy sources are rapidly used; ecological
environment has continuously deteriorated, particularly, greenhouse
gas emissions result in a serious global climate change; and thus
the sustainable development of human society is under serious
threat. Due to some features including infinite reserves, wide
distribution, clean and economy in use and so on, solar energy has
gained positive outlook, and is considered to be one of new
energies that has most potential development prospect and can most
meet increasing energy demands of the future society
development.
[0005] Due to its characteristics such as relatively good
adaptability to grid load, high photoelectric conversion
efficiency, generating scale effect with ease, more environmental
friendly producing processes of consumable materials, better
electric adjustability, solar thermal power generation is
considered to be an important development direction of utilization
of solar power generation in the future.
[0006] At present, depending on different condensing manners, there
mainly are several technical ideas for solar thermal power
generation such as groove typed idea, tower typed idea, dish typed
idea and the like. Specifically, compared with other ideas, a dish
solar thermal power generation system has the advantages of
flexible arrangement ability, high concentration ratio, high total
power generation efficiency, etc., and thus it gains more and more
attention.
[0007] A dish solar thermal power generation system generally
includes a concentrating dish, a heat collector and a heat
exchanger, a heat engine and so on. In the dish solar thermal power
generation system, the heat engine based on different principles
such as Rankine cycle (stream turbine), Bragton Cycle (gas
turbine), stirling Cycle (Stirling engine) or the like may be
adopted. However, no matter which heat engine is used, how to
efficiently and reliability absorb light energy and convert it into
heat energy and smoothly transfer the heat energy to heat absorbing
medium is extremely important. In such process, energy loss
directly affects on total power generation efficiency of the
system.
[0008] According to knowledge of radiation heat transfer, it is
know that using a cavity structure with an opening portion
facilitates improving a blackness system of a cross section of the
opening. That is, once radiant energy radiates into the cavity
structure through the opening portion, only a little part of the
radiant energy is reflected from the opening portion. Thus,
generally, a point-focusing heat collector of a thermal power
generation system adopts a cavity structure. The cavity structure
is usually formed by winding a heat absorbing coil which has a
low-temperature inlet and a high-temperature outlet. Heat absorbing
medium flows into the heat absorbing coil through the
low-temperature inlet. Sunlight condensed by a condensing dish
enters into a heat collecting chamber through the opening portion
of the cavity structure and directly radiates onto the heat
absorbing coil. After being absorbed by the heat absorbing coil,
the sunlight is converted into heat energy and is transferred to
the heat absorbing medium, and thus the heat absorbing medium with
the higher temperature flows out from the high-temperature outlet
and flows into a downstream energy utilization apparatus such as
heat exchanger, heat engine and the like.
[0009] According to principles of optics, it is known that, since
energy of parallel light concentrated by a revolution paraboloid is
not evenly distributed, and due to accuracy of manufacture of the
condensing dish, the light energy directly irradiating on the heat
absorbing coil is not evenly distributed, and it is prone to form a
local high temperature area. Once the local temperature exceeds an
allowable temperature of material of the heat absorbing coil, it is
possible to induce ablation phenomenon of the heat absorbing coil,
and to even burn the heat absorbing coil.
[0010] Furthermore, due to the accuracy of manufacturing of the
condensing dish and wind load and so on, a focal spot condensed by
the condensing dish usually has a shape and a size that deviate
from design values, and it cannot ensure that all of the light
reflected by the condensing dish can enter into the heat collecting
chamber. Thus, there is always a part of the light projecting onto
the external of the heat collector, which may increase surface
temperature of the heat collector and even burn it.
[0011] Therefore, the technical problems to be solved by those
skilled in the art is how to improve matching performance between
the heat collector and the condensing dish, optimize temperature
distribution of the heat absorbing coil and improve working
stability and reliability of the heat collector.
SUMMARY OF THE INVENTION
[0012] A first object of the present invention is to provide a heat
collector. The heat collector can prevent ablation phenomenon on a
heat absorbing coil caused by an over-high local temperature. A
second object of the present invention is to provide a solar
thermal power generation system having the above heat
collector.
[0013] In order to achieve the first object, the present
application provides a heat collector for a dish solar thermal
power generation system including a heat collecting chamber and at
least one layer of heat absorbing coil. Specifically, the heat
collecting chamber has an opening portion. The heat absorbing coil
forms a cavity structure with a hole, the cavity structure being
placed inside the heat collecting chamber such that the hole is
aligned with the opening portion. The heat absorbing coil has a
low-temperature inlet provided on a part with a maximum solar
radiation energy density of the cavity structure that has the
maximum solar radiation density.
[0014] Preferably, at least two layers of the heat absorbing coil
are provided.
[0015] Preferably, there is a preset clearance between adjacent
layers of the heat absorbing coil.
[0016] Preferably, a heat absorbing rib is provided on an outer
wall of the heat absorbing coil.
[0017] Preferably, the heat absorbing rib is a straight rib or a
helical rib.
[0018] Preferably, the heat collecting chamber includes an inner
shell, an outer shell and a front covering plate. The inner shell
has an inner wall defining the inner wall of the heat collecting
chamber. The outer shell is disposed outside of the inner shell.
The front covering plate forms the opening portion of the heat
collecting chamber. The inner shell and the outer shell are fixed
relative to the front covering plate, and a thermal insulation
layer is provided between the inner shell, the outer shell and the
front covering plate
[0019] Preferably, a transparent covering plate is provided at the
opening portion.
[0020] Preferably, the front covering plate is provided thereon
with a cooling sheath for circulation of cooling medium.
[0021] Preferably, the cooling sheath has a cooling-medium outlet
in communication with the low-temperature inlet of the heat
absorbing coil
[0022] Preferably, the inner wall of the heat collecting chamber is
provided with a reflective coating.
[0023] Preferably, the inner shell and the outer shell each are
formed by a plurality of segments, and the plurality of segments
are connected by a flange or a fastener to form an integral
structure.
[0024] Preferably, the cavity structure is of a spherical crown
shape, or an inverted conical frustum shape.
[0025] The heat collector according to the present application
includes a heat collecting chamber and a heat absorbing coil. The
heat collecting chamber has an opening portion. The heat absorbing
coil forms a cavity structure having a hole. The hole of the cavity
structure is aligned with the opening portion of the heat
collecting chamber. The heat absorbing coil has a low-temperature
inlet and a high-temperature outlet, with the low-temperature inlet
being provided at the location of the cavity structure irradiated
by incident light.
[0026] In the heat collector with such structure, the
low-temperature inlet is provided at the location of the cavity
structure irradiated by the incident light. The energy at the
location irradiated by incident light has a highest energy density,
and the heat absorbing medium at the low-temperature inlet has the
lowest temperature, so that the heat absorbing medium with a low
temperature may quickly absorb energy from incident light, thereby
preventing ablation phenomenon due to a local temperature at that
location of the heat absorbing coil exceeding an allowable
temperature. Furthermore, the location of less energy density
corresponds to the heat absorbing coil containing the heat
absorbing medium with a higher temperature. As a result, the
temperature of the heat absorbing coil is more uniform, and a
collecting temperature of the heat collector is higher, thus
broadening range of application of the heat collector.
[0027] For achieving the second object, the present application
further provides a dish solar thermal power generation system. The
dish solar thermal power generation system includes a condensing
dish, a heat exchanger and the heat collector described above.
Since the above heat collector provides the above technical
effects, the dish solar thermal power generation system having such
heat collector also provides the corresponding technical
effects.
BRIEF DESCRIPTION OF THE DRAWINGS
[0028] FIG. 1 is a structural schematic view of a specific
embodiment of a heat collector according to the present
invention;
[0029] FIG. 2 is a schematic view showing an outer structure of the
heat collector in FIG. 1;
[0030] FIG. 3 is a structural schematic view of a heat absorbing
coil in FIG. 1;
[0031] FIG. 4 is a structural schematic view of another heat
absorbing coil of the heat collector according to the present
invention;
[0032] FIG. 5 is a structural schematic view of a heat absorbing
rib of the heat collector according to the present invention;
[0033] FIG. 6 is a structural schematic view of another heat
absorbing rib of the heat collector according to the present
invention;
[0034] FIG. 7 is a structural schematic view of a third heat
absorbing rib of the heat collector according to the present
invention.
[0035] In FIGS. 1 to 7,
TABLE-US-00001 1 high-temperature outlet, 2 heat absorbing medium,
3 low-temperature inlet, 4 thermal insulation layer, 5 upper outer
shell, 6 upper inner shell, 7 heat absorbing coil, 8 thermal
insulation layer, 9 lower inner shell, 10 lower outer shell, 11
cooling medium inlet, 12 cooling medium outlet, 13 cooling sheath,
14 sunlight, 15 transparent covering plate, 16 front covering
plate, 17 cooling medium flowing cavity, 18 cooling medium, 19 heat
absorbing rib.
DETAILED DESCRIPTION OF THE INVENTION
[0036] For those skilled in the art to understand better the
technical solutions of the present invention, the present invention
will be further explained in detail in conjunction with the
accompanying drawings and specific embodiments.
[0037] Referring to FIGS. 1, 2 and 3, FIG. 1 is a structural
schematic view of a specific embodiment of a heat collector
according to the present invention; FIG. 2 is a schematic view
showing an outer structure of the heat collector in FIG. 1; and
FIG. 3 is a structural schematic view of a heat absorbing coil in
FIG. 1.
[0038] As shown in FIGS. 1 and 2, a heat collector for a dish solar
thermal power generation system according to the present
application includes a heat collecting chamber and a heat absorbing
coil 7. At least one layer of the heat absorbing coil 7 is
provided. The heat collecting chamber has an opening portion for
allowing sunlight 14 to enter in the heat collecting chamber. Each
layer of the heat absorbing coil 7 is wound into a substantially
helical structure to form a cavity structure. The cavity structure
has a hole having a certain dimension. The cavity structure is
placed inside the heat collecting chamber. The hole is aligned with
the opening portion of the heat collecting portion. The heat
absorbing coil 7 has a low-temperature inlet 3 and a
high-temperature outlet 1. In a specific solution, the
low-temperature inlet 3 and the high-temperature outlet 1 may each
be provided with a connecting flange or a dedicated connector for
connecting to the outside. Heat absorbing medium 2 flows into the
heat absorbing coil 7 through the low-temperature inlet 3 and flows
out from the high-temperature outlet 1. The low-temperature inlet 3
of the heat absorbing coil 7 is provided at a part of the cavity
structure having the maximum solar radiation energy density. The
part of the cavity structure having the maximum solar radiation
energy density may be a part of the heat absorbing coil 7
irradiated by sunlight. As shown in FIG. 1, when sunlight
irradiates vertically through the opening portion, the location
illuminated by sunlight may be specifically located at the bottom
of the cavity structure.
[0039] After flowing into the heat collecting cavity through the
opening portion of the heat collecting cavity, firstly, the
sunlight condensed by a condensing dish directly radiates to the
inside of the heat absorbing coil 7, with a part of the sunlight
being absorbed directly by the heat absorbing coil 7 to be
converted into heat energy and the other part being diffusely
reflected. Since the opening portion of the heat collecting cavity
has a smaller area than the effective heat absorbing area of the
heat collector, and the radiation heat transfer angle coefficient
of the opening portion is smaller relative to a total heat
absorbing surface, only a little part of the diffusely reflected
light runs out from the opening portion, and most of the diffusely
reflected light may project onto other part of the heat absorbing
coil 7 or an inner wall of the heat collecting chamber again. The
heat absorbing medium 2 passes through the heat absorbing coil 7
which absorbs energy and transfers it to the heat absorbing medium
2, so as to increase internal energy of the heat absorbing medium
2. The heat absorbing medium 2 with higher internal energy flows
out of the heat collector through the high-temperature outlet 1 and
flows into a downstream energy utilization apparatus, for example,
a heat exchanger, a heat engine and so on. Thus, the light energy
is converted into heat energy and the heat energy is output.
[0040] In the heat collector with such structure, the
low-temperature inlet 3 is provided at the part of the cavity
structure having the maximum solar radiation energy density. Since
the highest energy density occurs at the position irradiated by
sunlight 14, and the heat absorbing medium 2 at the low-temperature
inlet 3 has the lowest temperature, the heat absorbing medium 2
with a low temperature may quickly absorb energy from incident
light, thus preventing ablation phenomenon due to a local
temperature at that position of the heat absorbing coil 7 exceeding
an allowable temperature. Furthermore, the location of less energy
density corresponds to the heat absorbing coil 7 containing the
heat absorbing medium 2 with a higher temperature. As a result, the
temperature of the heat absorbing coil 7 is more uniform, and a
collecting temperature of the heat collector is higher, thus
broadening range of application of the heat collector.
[0041] In a specific solution, the heat collecting chamber
specifically may include an inner shell, an outer shell and a front
covering plate 16. The inner wall of the inner shell defines the
inner wall of the heat collecting chamber. The outer shell is
disposed outside of the inner shell. The front covering plate 16 is
provided therein with an opening which defines the opening portion
of the heat collecting chamber. The inner shell and the outer shell
are fixed relative to the front covering plate 16. A thermal
insulation layer is provided between the inner shell, the outer
shell and the front covering plate 16. Particularly, the thermal
insulation layer between the inner shell and the outer shell may
reduce lose of heat absorbed by the inner wall of the inner shell
to the outside, so as to increase the temperature of the inner
shell and reduce effective radiant heat transfer between the heat
absorbing coil land the inner shell, thereby reducing heat loss of
the heat collector.
[0042] In a further solution, the heat absorbing coil 7 can be
fixed onto the inner wall of the inner shell by an elastic clip
seat or a pinch tube or the like.
[0043] In a preferred solution, the inner wall of the inner shell
is provided with a reflective coating with a high reflection
coefficient, such as a metallic silver coating. After projecting
onto the reflective coating on the inner wall of the inner shell,
the diffusely reflected light is reflected onto the heat absorbing
coil 7 again, thus reducing the heat absorbed by the inner wall of
the inner shell, and reducing the heat lose of the heat
collector.
[0044] In a preferred solution, a transparent covering plate 15 is
provided at the open portion of the heat collector. In a specific
solution, a transparent covering plate 15 is provided at the
opening of the front covering plate 16. The transparent covering
plate 15 may block air flow between the inside and the outside of
the heat collecting chamber, which may thus not only reduce
convection heat loss in the heat collecting cavity, but also
prevent foreign matters such as insects, dust or the like from
entering the heat collecting chamber to otherwise negatively affect
working reliability of the heat collector. In a specific solution,
the transparent covering plate 15 may be a glass covering plate.
However, the present invention is not limited to the glass covering
plate, and the transparent covering plate 15 can be a resin
covering plate, a plastic covering plate or the like. All of
transparent sheet can be used as the transparent covering plate 15
in the present invention.
[0045] In a preferred solution, for simplifying the manufacturing
process of the heat collector, both the inner shell and the outer
shell can be formed by multiple segments, with the segments being
connected by a flange or a fastener to form an integral structure.
As shown in FIGS. 1 and 2, the inner shell may include an upper
inner shell 6 and a lower inner shell 9, and the outer shell may
include an upper outer shell 5 and a lower outer shell 10. A
thermal insulation layer 4 is provided between the upper inner
shell 6 and the upper outer shell 5, and a thermal insulation layer
8 is provided between the lower inner shell 9 and the lower outer
shell 10.
[0046] In a preferred solution, the front covering plate 16 is
provided thereon with a cooling sheath 13 for circulation of
cooling medium 18. The cooling sheath 13 is provided with a cooling
medium inlet 11, a cooling medium outlet 12 and a cooling medium
flowing cavity 17. The cooling medium 18 flows into the cooling
medium flowing cavity 17 through the cooling medium inlet 11, and
flows out from the cooling medium outlet 11 after circulating in
the cooling medium flowing cavity 17. When the light reflected by
the condensing dish partly projects onto a front end of the heat
collector, the cooling medium 18 in the cooling sheath 13 may bring
away the heat generated by the light projected onto the front end
of the heat collector, which may avoid the front end of the heat
collector from burning out, thus effectively protecting the heat
collector and ensuring reliability of the heat collector.
[0047] In a more preferred solution, if the cooling medium 18 in
the cooling sheath 13 is identical to the heat absorbing medium 2
in the heat absorbing coil 7, the outlet 12 of the cooling sheath
13 for the cooling medium 18 may be in communication with the
low-temperature inlet 3 of the heat absorbing coil 7. Thus, the
cooling medium 18 flowing out of the cooling sheath 13 may be
converged into the low-temperature inlet 3 of the heat absorbing
coil 7 through a pipeline so as to increase the temperature of the
medium flowing into the heat absorbing coil 7, thereby increasing
the heat exchange efficiency of the heat collector.
[0048] In a preferred solution, there are at least two layers of
heat absorbing coil 7. As shown in FIG. 3, two or more layers of
heat absorbing coil 7 can be arranged concentrically. With such
structure, temperature gradient inside the wall of the heat
absorbing coil 7 can be improved, and the flowing path of the heat
absorbing medium 2 heated in the heat absorbing coil 7 is
lengthened, thereby ensuring that the heat absorbing medium 2 can
be heated continuously and smoothly.
[0049] In a more preferred solution, there is a preset clearance
between adjacent layers of the heat absorbing coil 7. The preset
clearance between different layers of the heat absorbing coil 7 may
ensure that the surface of each layer of the heat absorbing coil 7
can suitably absorb heat. Therefore, flowing path of the heat
absorbing medium 2 heated in the heat absorbing coil 7 can be
further prolonged and the heat absorbing medium 2 can be heated
continuously and smoothly.
[0050] In a further solution, the heat absorbing coil 7 in the same
layer can be arranged with a preset clearance. With such structure,
it can be ensured that the entire surface of the heat absorbing
coil 7 in the same layer can suitably absorb heat.
[0051] In a preferred solution, for enhancing heat absorbing
capacity of the heat absorbing coil 7, in particular heat absorbing
capacity of the part with higher energy density of the heat
absorbing coil 7, a heat absorbing rib 19 may be provided on an
outer wall of the heat absorbing coil 7. As shown in FIGS. 5, 6 and
7, the heat absorbing rib 19 may be a straight rib or a helical
rib.
[0052] In the present application, the shape of the cavity
structure formed by the heat absorbing coil 7 is not limited. The
cavity structure can be a structure of spherical crown as shown in
FIG. 3, or a structure of inverted conical frustum as shown in FIG.
4. If the cavity structure is of the spherical crown shape, the
layers of the heat absorbing coil 7 can be concentrically arranged.
If the cavity structure is of the inverted conical frustum shape,
the layers of the heat absorbing coil 7 can be coaxially
arranged.
[0053] The present invention further provides a dish solar thermal
power generation system. The dish solar thermal power generation
system includes a condensing dish, a heat exchanger and the heat
collector described above. Since the above heat collector produces
the above technical effects, the dish solar thermal power
generation system having such heat collector also produces the
corresponding technical effects, which will not be introduced in
detail herein.
[0054] The foregoing only relates to the preferred embodiments of
the present application. It should be noted that, due to limitation
of literal expression, and since there are unlimited specific
structures objectively, various improvements and modifications can
be made by those skilled in the art without departing from the
principle of the present application, and these improvements and
modifications should also be deemed to fall within the scope of
protection of the present application.
* * * * *