CN105546855A - Reinforced heat transferring large-diameter vacuum heat collecting tube - Google Patents

Reinforced heat transferring large-diameter vacuum heat collecting tube Download PDF

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Publication number
CN105546855A
CN105546855A CN201610065959.2A CN201610065959A CN105546855A CN 105546855 A CN105546855 A CN 105546855A CN 201610065959 A CN201610065959 A CN 201610065959A CN 105546855 A CN105546855 A CN 105546855A
Authority
CN
China
Prior art keywords
tube
major diameter
metal absorption
augmentation
vacuum heat
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201610065959.2A
Other languages
Chinese (zh)
Inventor
许世森
裴杰
徐越
郑建涛
刘明义
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Huaneng Clean Energy Research Institute
Huaneng Group Technology Innovation Center Co Ltd
Original Assignee
Huaneng Clean Energy Research Institute
Huaneng Group Technology Innovation Center Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huaneng Clean Energy Research Institute, Huaneng Group Technology Innovation Center Co Ltd filed Critical Huaneng Clean Energy Research Institute
Priority to CN201610065959.2A priority Critical patent/CN105546855A/en
Publication of CN105546855A publication Critical patent/CN105546855A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24SSOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S80/00Details, accessories or component parts of solar heat collectors not provided for in groups F24S10/00-F24S70/00
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24SSOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
    • F24S80/00Details, accessories or component parts of solar heat collectors not provided for in groups F24S10/00-F24S70/00
    • F24S2080/03Arrangements for heat transfer optimization
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/40Solar thermal energy, e.g. solar towers

Abstract

A reinforced heat transferring large-diameter vacuum heat collecting tube comprises a large-diameter glass outer tube, a large-diameter metal absorbing tube, a helical fin placed in the metal absorbing tube and a hollow round tube supporting the fin, wherein the helical fin is wound on the outer side of the hollow round tube, the hollow round tube is fixed on the inner surface of the metal absorbing tube through a radiation type bracket, a selective absorbing coating is coated on the outer surface of the metal inner tube, and the two ends of the metal absorbing tube and the glass outer tube are respectively sealed by seal connecting devices so that a vacuum layer is formed between the metal absorbing tube and the glass outer tube. The diameter of the metal absorbing tube is between 120mm and 300mm and is larger than that, that is 40mm to 70mm, of the conventional vacuum heat collecting tube, so that the sunlight absorbing area of the metal absorbing tube can be increased, the light intercepting rate of the metal absorbing tube is improved, and the adaptability to system optical errors is enhanced. At the same time, the helical fin is arranged in the metal absorbing tube, so that the disturbance of inner fluid is increased, inner heat transferring is reinforced, and the utilization rate of sunlight in unit area is improved.

Description

A kind of augmentation of heat transfer major diameter vacuum heat collection pipe
Technical field
The invention belongs to solar energy conversion component technical field, particularly a kind of augmentation of heat transfer major diameter vacuum heat collection pipe.
Background technology
Solar energy be clean, pollution-free, reproducible natural resources, fully develop solar energy and effectively can alleviate the problem of environmental pollution that energy shortage and fossil energy bring.
Solar energy heat utilization technology and solar photoelectric utilize technology to be common solar utilization technique, and the former mainly comprises three kinds of technology: tower, slot type and butterfly.Wherein, trough type solar power generation technology is the current hot generation technology of the most ripe, that cost is minimum large solar.Solar receiver is one of core component of solar light-heat power-generation system.
Through type metal-glass vaccum heat-collecting tube (abbreviation vacuum heat collection pipe) is most widely used receiver in current groove type solar electricity generation system.The thermal-collecting tube Metal absorption diameter of inner pipe of current routine is between 40mm-70mm, and the width of absorbing surface is less.Ideally, parabolic concentrator can by the parallel light focusing of zero incidence angle on the axis of absorption tube, but in fact because tracking system can not definitely precisely follow the tracks of the factor such as the sun and thermal expansion, cause the light rate of cutting of absorption tube to reduce.Facts have proved, along with Metal absorption bore increases, the light rate of cutting of absorption tube increases, and the larger absorption tube of caliber has better adaptability to the optical parallax that whole system produces.In addition, common metal absorption tube inner wall smooth, is unfavorable for radial heat transfer, arranges helical fin, can increase internal flow disturbance in inside, produce spiral flow, augmentation of heat transfer.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of augmentation of heat transfer major diameter vacuum heat collection pipe, adopt major diameter metal absorption tube, and set up helical fin in Metal absorption pipe inside, thus solve the less problem of conventional vacuum thermal-collecting tube endotherm area, can internal heat transfer be strengthened simultaneously.
To achieve these goals, the technical solution used in the present invention is:
A kind of augmentation of heat transfer major diameter vacuum heat collection pipe, comprise major diameter outer glass tube 1, be placed in the major diameter metal absorption tube 3 of major diameter outer glass tube 1, be placed in the hollow circular-tube 4 with helical fin 2 of Metal absorption pipe 3, the two ends of described major diameter outer glass tube 1 and major diameter metal absorption tube 3 ensure to be vacuum layer therebetween respectively by sealing and connecting device sealing, and arrange expansion joint 5 in end.
The diameter of described major diameter outer glass tube 1 is 150mm-500mm.
Described major diameter metal absorption tube 3 diameter between 120mm-300mm, 40mm-70mm larger than conventional vacuum thermal-collecting tube diameter.
Described Metal absorption pipe 3 is made up of stainless steel or carbon steel.
Described major diameter metal absorption tube 3 outer surface scribbles coating for selective absorption.The passable absorptivity of coating for selective absorption is greater than 95% (testing at 300 DEG C), and emissivity is less than 10% (testing at 300 DEG C).
Described helical fin 2 is wound in outside the hollow circular-tube 4 of two ends sealing, and increase liquid at internal disturbance, the inner surface of helical fin 2 outer rim and major diameter metal absorption tube 3 leaves a fixed gap.
Described hollow circular-tube 4 is supported by radiant type support 6, hollow circular-tube 4 head end is fixedly connected with coaxial metal absorption tube 3 inner surface by radiant type support 6, in the middle part of hollow circular-tube 4 and end be slidably connected by radiant type support 6 and coaxial metal absorption tube 3 inner surface, ensure the rigidity of hollow circular-tube 4 and the free wxpansion of axis.
Compared with prior art, the invention has the beneficial effects as follows:
1) native system is by increasing Metal absorption pipe diameter, increases absorption area and cuts light rate, strengthens absorption tube to the adaptability of the optical parallax that whole system produces, improves Solar use efficiency.
2) native system arranges helical fin in Metal absorption pipe inside, makes fluid produce continuous cyclone in pipe, and the Secondary Flow that spiral flow causes promotes the mixing of fluid radial direction, convection heat transfer' heat-transfer by convection in enhanced tube.
Accompanying drawing explanation
Fig. 1 is overall structure schematic diagram of the present invention.
Fig. 2 is Metal absorption tubular construction schematic diagram of the present invention.
Fig. 3 is helical fin structure schematic diagram of the present invention.
Fig. 4 is radiant type support schematic diagram of the present invention.
Detailed description of the invention
Embodiments of the present invention are described in detail below in conjunction with drawings and Examples.But those skilled in the art understand, and following content is not limiting the scope of the invention, any improvement of making on basis of the present invention and change are all within protection scope of the present invention.
As shown in Figure 1, a kind of augmentation of heat transfer major diameter of the present invention vacuum heat collection pipe, comprise major diameter outer glass tube 1, major diameter metal absorption tube 3, be placed in the helical fin 2 of major diameter metal absorption tube 3 inside and support the hollow circular-tube 4 of fin, the diameter of major diameter outer glass tube 1 is 150mm-500mm.
Major diameter metal absorption tube 3 outer surface scribbles coating for selective absorption, and the two ends of major diameter metal absorption tube 3 and outer glass tube 1 ensure to be vacuum layer therebetween respectively by sealing and connecting device sealing, and arrange expansion joint 5 in end.Vacuum layer effectively can reduce the convection heat transmission between major diameter metal absorption tube 3 and major diameter outer glass tube 1, reduces the heat waste of major diameter vacuum heat collection pipe entirety.
As shown in Figure 2, be Metal absorption tubular construction schematic diagram, major diameter metal absorption tube 3 diameter, between 120mm-300mm, is greater than conventional vacuum thermal-collecting tube 40mm-70mm, and major diameter metal absorption tube 3 inside is equipped with helical fin 2.
As shown in Figure 3, be helical fin structure schematic diagram, helical fin 2 is wound in hollow circular-tube 4 outer surface, there is certain interval between helical fin 2 and major diameter metal absorption tube 3, and working medium flows through helical fin 2 and produces spiral flow.
As shown in Figure 4, for radiant type support 6 structural representation, support entirety radially, internal punches, face, outer circumferential contacts with Metal absorption pipe internal surface, and inner circular aperture supports hollow circular-tube 4, hollow circular-tube 4 head end, middle part and end are all equipped with radiant type support 6, wherein head end is fixedly connected with coaxial major diameter metal absorption tube 3 inner surface, and middle part and end, for being slidably connected, ensure rigidity and the axial expansion of hollow circular-tube 4 simultaneously.
In the present invention, by increasing Metal absorption pipe diameter, namely utilizing major diameter metal absorption tube 3, increasing absorption area and cutting light rate, strengthen absorption tube to the adaptability of the optical parallax that whole system produces, thus improve Solar use efficiency.The two ends of major diameter metal absorption tube 3 and outer glass tube 1 ensure to be vacuum layer therebetween respectively by sealing and connecting device sealing, and arrange expansion joint 5 in end.Vacuum layer effectively can reduce the convection heat transmission between major diameter metal absorption tube 3 and major diameter outer glass tube 1, reduces the heat waste of major diameter vacuum heat collection pipe entirety.Helical fin 2 can make fluid produce continuous cyclone in pipe, the Secondary Flow that spiral flow causes promotes the mixing of fluid radial direction, convection heat transfer' heat-transfer by convection in enhanced tube, improve the heat transfer coefficient between the inwall of major diameter metal absorption tube 3 and tube fluid, more heat can be passed to the fluid in pipe, the continuous cyclone simultaneously produced due to helical fin 2 can promote the mixing of tube fluid, makes the uniformity of temperature profile of fluid, improves the security of major diameter vacuum heat collection pipe.

Claims (7)

1. an augmentation of heat transfer major diameter vacuum heat collection pipe, it is characterized in that, comprise major diameter outer glass tube (1), be placed in the major diameter metal absorption tube (3) of major diameter outer glass tube (1), be placed in the hollow circular-tube with helical fin (2) (4) of Metal absorption pipe (3), the two ends of described major diameter outer glass tube (1) and major diameter metal absorption tube (3) ensure to be vacuum layer therebetween respectively by sealing and connecting device sealing, and arrange expansion joint (5) in end.
2. augmentation of heat transfer major diameter vacuum heat collection pipe according to claim 1, it is characterized in that, the diameter of described major diameter outer glass tube (1) is 150mm-500mm; Described major diameter metal absorption tube (3) diameter between 120mm-300mm, 40mm-70mm larger than conventional vacuum thermal-collecting tube diameter.
3. augmentation of heat transfer major diameter vacuum heat collection pipe according to claim 1 or 2, is characterized in that, described Metal absorption pipe (3) is made up of stainless steel or carbon steel.
4. augmentation of heat transfer major diameter vacuum heat collection pipe according to claim 3, it is characterized in that, described major diameter metal absorption tube (3) outer surface scribbles coating for selective absorption.
5. augmentation of heat transfer major diameter vacuum heat collection pipe according to claim 4, it is characterized in that, the absorptivity of described coating for selective absorption is greater than 95%, and emissivity is less than 10%.
6. augmentation of heat transfer major diameter vacuum heat collection pipe according to claim 1, it is characterized in that, described helical fin (2) is wound in hollow circular-tube (4) outside of two ends sealing, and the inner surface of helical fin (2) outer rim and major diameter metal absorption tube (3) leaves a fixed gap.
7. augmentation of heat transfer major diameter vacuum heat collection pipe according to claim 1 or 6, it is characterized in that, described hollow circular-tube (4) is supported by radiant type support (6), hollow circular-tube (4) head end is fixedly connected with coaxial metal absorption tube (3) inner surface by radiant type support (6), hollow circular-tube (4) middle part and end are slidably connected by radiant type support (6) and coaxial metal absorption tube (3) inner surface, ensure hollow circular-tube (4) free wxpansion.
CN201610065959.2A 2016-01-29 2016-01-29 Reinforced heat transferring large-diameter vacuum heat collecting tube Pending CN105546855A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610065959.2A CN105546855A (en) 2016-01-29 2016-01-29 Reinforced heat transferring large-diameter vacuum heat collecting tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610065959.2A CN105546855A (en) 2016-01-29 2016-01-29 Reinforced heat transferring large-diameter vacuum heat collecting tube

Publications (1)

Publication Number Publication Date
CN105546855A true CN105546855A (en) 2016-05-04

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109326446A (en) * 2018-09-18 2019-02-12 华北电力大学(保定) Solar energy reacts receiver
CN109668328A (en) * 2018-12-25 2019-04-23 中国科学院电工研究所 A kind of evacuated collector tube with the semi-circumference unilateral side fin body being threadingly advanced

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1908548A (en) * 2006-08-21 2007-02-07 河海大学 Inner-expanded-type solar vacuum heat-collecting pipe
CN200979303Y (en) * 2006-12-05 2007-11-21 王恒月 Stew-basking type all glass vacuum-tube solar water heater
CN201014790Y (en) * 2007-03-20 2008-01-30 马淑芬 Full glass vacuum solar thermal-collecting tube with cork
CN201215399Y (en) * 2008-05-15 2009-04-01 黄永定 U-type tubular solar heat collector
CN203405012U (en) * 2013-07-26 2014-01-22 汪禹 Double-sleeve spiral interlayer type heat collection core tube
CN205351835U (en) * 2016-01-29 2016-06-29 中国华能集团清洁能源技术研究院有限公司 Major diameter evacuated collector tube

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1908548A (en) * 2006-08-21 2007-02-07 河海大学 Inner-expanded-type solar vacuum heat-collecting pipe
CN200979303Y (en) * 2006-12-05 2007-11-21 王恒月 Stew-basking type all glass vacuum-tube solar water heater
CN201014790Y (en) * 2007-03-20 2008-01-30 马淑芬 Full glass vacuum solar thermal-collecting tube with cork
CN201215399Y (en) * 2008-05-15 2009-04-01 黄永定 U-type tubular solar heat collector
CN203405012U (en) * 2013-07-26 2014-01-22 汪禹 Double-sleeve spiral interlayer type heat collection core tube
CN205351835U (en) * 2016-01-29 2016-06-29 中国华能集团清洁能源技术研究院有限公司 Major diameter evacuated collector tube

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109326446A (en) * 2018-09-18 2019-02-12 华北电力大学(保定) Solar energy reacts receiver
CN109668328A (en) * 2018-12-25 2019-04-23 中国科学院电工研究所 A kind of evacuated collector tube with the semi-circumference unilateral side fin body being threadingly advanced
CN109668328B (en) * 2018-12-25 2020-07-14 中国科学院电工研究所 Vacuum heat collecting tube with spirally-advancing semi-circumferentially-distributed fin bodies

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Application publication date: 20160504