CN115075979A - Stirling engine heater - Google Patents

Stirling engine heater Download PDF

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Publication number
CN115075979A
CN115075979A CN202210685631.6A CN202210685631A CN115075979A CN 115075979 A CN115075979 A CN 115075979A CN 202210685631 A CN202210685631 A CN 202210685631A CN 115075979 A CN115075979 A CN 115075979A
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China
Prior art keywords
heating
stirling engine
tube
flue gas
section
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Granted
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CN202210685631.6A
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CN115075979B (en
Inventor
辛凤
杨凯
赵斌
曹文广
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Changsha University of Science and Technology
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Changsha University of Science and Technology
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Publication of CN115075979A publication Critical patent/CN115075979A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G1/00—Hot gas positive-displacement engine plants
    • F02G1/04—Hot gas positive-displacement engine plants of closed-cycle type
    • F02G1/043—Hot gas positive-displacement engine plants of closed-cycle type the engine being operated by expansion and contraction of a mass of working gas which is heated and cooled in one of a plurality of constantly communicating expansible chambers, e.g. Stirling cycle type engines
    • F02G1/053—Component parts or details
    • F02G1/055—Heaters or coolers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
    • F02G2255/00—Heater tubes
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/40—Solar thermal energy, e.g. solar towers
    • Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

The invention relates to a Stirling engine and provides a Stirling engine heater which comprises a heating chamber, a flue gas inlet, a flue gas outlet and a heating tube cluster, wherein the flue gas inlet and the flue gas outlet are arranged on the outer wall of the heating chamber, the heating tube cluster is surrounded by the heating chamber arranged outside the heating tube cluster, a working medium inlet of the heating tube cluster is connected with a heat regenerator, a working medium outlet of the heating tube cluster is connected with an expansion chamber, the heating tube cluster is formed by circumferentially arranging a plurality of heating tubes around the central axis of the heating tube cluster, and the heating tubes are formed into an inwards concave tube section. The Stirling engine heater increases the heat absorption capacity of the working medium in the given heating chamber space, thereby improving the temperature of the working medium at the outlet of the heater, enhancing the expansion acting capacity of the heater and improving the performance of the Stirling engine.

Description

Stirling engine heater
Technical Field
The present invention relates to stirling engines and in particular to a stirling engine heater.
Background
The Stirling engine is a closed cycle engine adopting external heating, has the advantages of strong fuel adaptability, high theoretical efficiency, simple structure, low noise and the like, and has important application in aspects of distributed energy systems, clean gas and renewable energy power generation, underwater power and the like. The working medium is heated, expanded, cooled and compressed to be a driving force source for the Stirling engine to do work externally, and the temperature difference between the heat source and the working medium in the heater is far larger than that between the cold source and the working medium in the cooler, so that the heat transfer capacity among the heat source, the heater and the working medium is enhanced to be crucial to improving the performance of the Stirling engine. The energy of the process is converted into: the external combustion system converts the chemical energy of the fuel into heat energy through organizing reasonable and efficient combustion, the heat energy is transmitted to the internal gaseous working medium through the heater, the working medium expands when being heated, the working capacity is achieved, and the structure and the performance of the heater are the key for influencing energy transmission in the process.
At present, in order to compromise heat exchange efficiency, useless volume, combustion chamber volume, stirling engine tubular heater adopts heating pipe inflection tube cluster to arrange usually, and the expansion chamber is connected to single heating pipe one end promptly, and the regenerator is connected to the other end, and the middle inflection is crooked, and the shape is similar to the U type, and the annular tube cluster is arranged into to many U type heating pipes that geometric dimension is the same circumference in the combustion chamber, and above-mentioned tube cluster formula heater is the most common stirling engine heater form of using at present. However, the non-return part of the heater arranged in the return tube cluster in the prior art is a straight tube, namely a straight tube cluster type heater is adopted. The processing of the straight-line tube cluster type heater is relatively simple, but the energy utilization efficiency, the heating uniformity and the space utilization rate of the combustion cavity are still required to be improved, the arrangement mode of the heater tube cluster is further innovated on the premise of not excessively increasing the volume of the combustion cavity, the heat absorption capacity of the heater tube cluster is enhanced, the heat released by fuel combustion is absorbed to the maximum extent, and the actual efficiency and the compactness of the Stirling engine are improved.
In view of the above technical problems, the present invention provides a novel stirling engine heater.
Disclosure of Invention
The invention aims to solve the technical problem of providing a Stirling engine heater, which increases the heat absorption capacity of a working medium, thereby improving the temperature of the working medium at the outlet of the heater, enhancing the expansion acting capacity of the heater and improving the performance of the Stirling engine.
In order to solve the technical problem, the invention provides a Stirling engine heater, which comprises a heating chamber, a flue gas inlet, a flue gas outlet and a heating tube cluster, wherein the flue gas inlet and the flue gas outlet are arranged on the outer wall of the heating chamber, the heating tube cluster is surrounded by the heating chamber arranged outside the heating tube cluster, a working medium inlet of the heating tube cluster is connected with a heat regenerator, a working medium outlet of the heating tube cluster is connected with an expansion chamber, the heating tube cluster is formed by circumferentially arranging a plurality of heating tubes around the central axis of the heating tube cluster, and the heating tubes are formed with an inwards concave tube section,
typically, the inner concave pipe section is an arc-shaped inner concave pipe section, and the arc-shaped inner concave pipe section is deviated from the bottom to the top to the central axis of the heating pipe cluster or the inner side wall of the heating chamber.
Specifically, the heating tube includes a peripheral tube section and an inner peripheral tube section, one end of the peripheral tube section is communicated with one end of the inner peripheral tube section, the other end of the peripheral tube section is connected with the heat regenerator, the other end of the inner peripheral tube section is connected with the expansion cavity, and the peripheral tube section and/or the inner peripheral tube section are/is formed with the inner concave tube section.
Specifically, all the tube sections of the heating tube are the inner concave tube sections; or the local pipe section of the heating pipe is the inner concave pipe section, and the rest pipe sections of the heating pipe are straight pipe sections.
Preferably, the whole section or the partial section of the heating tube is twisted along the central axis of the heating tube bundle to form a twisted section.
Specifically, the working medium inlets are annularly arranged in a single-layer mode or in a multi-layer concentric mode around the central axis of the heating tube cluster, and the working medium outlets are annularly arranged in a single-layer mode or in a multi-layer concentric mode around the central axis of the heating tube cluster.
Preferably, the plurality of flue gas inlets are arranged on the outer side wall of the heating chamber close to the bottom of the heating chamber and are circumferentially and uniformly distributed, the plurality of flue gas outlets are arranged on the outer wall of the top of the heating chamber, and the flue gas outlets are circumferentially and uniformly distributed along the central axis of the heating chamber.
More preferably, the included angle between the inlet axis of the flue gas inlet and the tangent of the outer side wall of the heating chamber where the flue gas inlet is arranged is 20-50 degrees, and the inlet axis of the flue gas outlet is perpendicular to the outer wall of the top of the heating chamber.
Preferably, the outer wall of the heating tube is arranged with fins or ribs.
Preferably, fins or ribs are arranged on the inner wall of the heating chamber.
Through the scheme, the invention has the following beneficial effects:
the heating pipe of the Stirling engine heater adopts the inner concave pipe section, the heating pipe cluster formed by the arrangement of the heating pipes prolongs the heating path of the working medium in the space of the set heating cavity, the heat exchange area of the working medium is increased, the flue gas flow field in the heating cavity is changed by the heating pipe cluster, the disturbance of the pipe cluster to the external flue gas flow field is enhanced, the heat exchange effect of the flow field outside the pipe is improved, the heat absorption capacity of the working medium is increased, the outlet temperature is improved, the power-applying capacity is enhanced, and the efficiency of the Stirling engine is improved on the premise of not influencing the compactness of the engine.
In addition, the whole pipe section or the local pipe section of the heating pipe rotates circumferentially along the central axis of the heating pipe cluster to form a twisted pipe section, so that the heating path of the working medium is further prolonged, the disturbance capability on an external flue gas flow field is stronger, and the efficiency of the Stirling engine is improved more obviously.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of the construction of a Stirling engine heater according to the present invention;
FIG. 2 is a top plan view of the Stirling engine heater of the present invention;
FIG. 3 is a schematic view in axial half section of a Stirling engine heater according to the present invention;
FIG. 4 is a schematic view in radial half section of a Stirling engine heater according to the present invention;
FIG. 5 is a schematic structural view of a first embodiment of a heater tube in a Stirling engine heater according to the present invention;
FIG. 6 is a schematic structural view of a second embodiment of a heating tube of the Stirling engine heater of the present invention;
FIG. 7 is a schematic structural view of a third embodiment of a heating tube of the Stirling engine heater of the present invention;
FIG. 8 is a schematic structural view of one arrangement of the heat tube bundle of the Stirling engine heater of the present invention;
FIG. 9 is a schematic structural view of an alternative arrangement of the heat tube bundle of the Stirling engine heater of the present invention;
FIG. 10 is a schematic diagram of one arrangement of the heat tube bundle of the Stirling engine heater of the present invention;
FIG. 11 is a schematic structural view of an alternative arrangement of the heat tube bundle of the Stirling engine heater of the present invention;
FIG. 12 is a schematic view of the construction of a rectangular parallelepiped heating chamber of the Stirling engine heater of the present invention;
FIG. 13 is a schematic structural view of one embodiment of the arcuate recessed section of the Stirling engine heater of the present invention;
fig. 14 is a schematic structural view of another embodiment of the arcuate inner concave section of the stirling engine heater of the present invention.
Description of the reference numerals
1 flue gas inlet 2 heating chamber
3 flue gas outlet 4 heating tube bundle
5 working medium outlet and 6 working medium inlet
7 expansion chamber 8 regenerator
9 cooler 10 heating pipe
101 peripheral pipe section 102 inner peripheral pipe section
103 inner concave pipe section
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, and it is to be understood that the detailed description is provided for purposes of illustration and explanation and is not intended to limit the scope of the invention.
In the description of the present invention, it should be noted that, unless explicitly stated or limited otherwise, the terms "forming," "providing," "disposing," "connecting," "communicating," "arranging," "composing," and the like are to be construed broadly, and for example, the connecting may be direct, indirect through an intermediate medium, fixed, detachable or integral; either directly or indirectly through intervening connectors, either internally or in cooperative relationship to each other. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
In the present invention, unless otherwise specified, the terms "upper", "lower", "inner", "outer", "circumferential", "clockwise", "counterclockwise", "bottom", "top", and the like, when used in the sense of indicating or indicating the orientation or positional relationship, are used solely for the convenience of describing and simplifying the present invention and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the present invention; the directional terminology of the present invention should be understood in conjunction with the actual installation state.
Referring to fig. 1, 2 and 3, the stirling engine heater provided by the invention comprises a heating chamber 2, a flue gas inlet 1, a flue gas outlet 3 and a heating tube bundle 4, wherein the flue gas inlet 1 and the flue gas outlet 3 are arranged on the outer wall of the heating chamber 2, the heating tube bundle 4 is surrounded by the heating chamber 2 arranged outside the heating chamber, high-temperature flue gas enters the heating chamber 2 to exchange heat with the heating tube bundle 4, so that the temperature of a working medium inside the heating tube bundle 4 is raised, the working medium inlet 6 of the heating tube bundle 4 is connected with a heat regenerator 8, namely the working medium inlet 6 is also the outlet of the heat regenerator 8, the working medium passing through a cooler 9 enters the heat regenerator 8 to be primarily heated and then enters the heating tube bundle 4 to be completely heated, the working medium outlet 5 of the heating tube bundle 4 is connected with an expansion chamber 7, namely the working medium outlet 5 is also the inlet of the expansion chamber 7, the working medium enters the expansion chamber 7 to be expanded to apply work after being heated, the operation of drive stirling, heating tube cluster 4 is arranged by a plurality of heating pipes 10 around the central axis circumference of heating tube cluster 4 and is constituteed, heating pipe 10 is formed with indent pipeline section 103, indent pipeline section 103 compare with the straight tube section, the heating route of working medium has been prolonged in set heating cavity 2 space, increase the heat transfer area of working medium, can absorb more heats, and the heating tube cluster 4 that the heating pipe 10 that is formed with indent pipeline section 103 arranges the constitution is stronger to the disturbance in the heating cavity 2 interior flue gas flow field, the heat transfer effect in the flue gas flow field in the heating cavity has further been improved, improve the outlet temperature of working medium, the work ability reinforcing is done in the inflation, stirling's efficiency has been improved under the prerequisite that does not influence the engine compactness. The type of working medium in the heating pipe 10 is not limited, and is preferably an inert gas, such as helium, and may also be a gas, such as hydrogen, air, or nitrogen.
The inner concave pipe section 103 in the above technical solution is preferably an arc-shaped inner concave pipe section, the flow resistance of the arc-shaped inner concave pipe section is relatively small, so that the gas has good fluidity, referring to fig. 13 and 14, the left side in fig. 13 and 14 is the side close to the central axis of the heating pipe bundle 4, the right side is the side close to the inner side wall of the heating chamber 2, and in fig. 13, the arc-shaped inner concave pipe section is deviated from the central axis of the heating pipe bundle 4 from bottom to top; in fig. 14, the arc-shaped inner concave pipe section is biased from bottom to top toward the inner side wall of the heating chamber 2; the arc-shaped concave pipe section which is deviated from the central axis of the heating pipe bundle 4 is taken as a preferred embodiment of the invention, and the arc-shaped concave pipe section is deviated from the central axis of the heating pipe bundle 4, so that the space occupied in the radial direction is smaller, the volume of the heating chamber 2 is reduced, and the compact characteristic of the Stirling engine is better met. It should be noted that the curvature of the arc-shaped concave pipe sections may be continuously changed, and the arc-shaped concave pipe sections with different deviation may be connected to each other to form a pipe section similar to an "S" shape or a pipe section with more bends, so as to have a longer heating path in a given space. It should be noted that the extended heating path of the heating tube 10 should be determined according to the space of the heating chamber 2, so as to avoid the excessive extension of the heating path of the heating tube 10, and the increased useless volume is too large, which is not beneficial to the performance of the engine.
Referring to fig. 5, 6 and 7, the heating tube 10 is composed of an outer surrounding tube section 101 and an inner surrounding tube section 102, the inner surrounding tube section 102 is close to the central axis of the heating tube bundle 4, the outer surrounding tube section 101 is close to the inner wall of the heating chamber 2, one end of the outer surrounding tube section 101 is communicated with one end of the inner surrounding tube section 102, so that the heating tube is in a U shape, the axial size of the heating chamber 2 space occupied by the heating tube 10 is reduced, the other end of the outer surrounding tube section 101 is connected with the regenerator 8, the other end of the inner surrounding tube section 102 is connected with the expansion chamber 7, the connecting ends of the outer surrounding tube section 101 and the regenerator 8 jointly form a working medium inlet 6 of the heating tube bundle 4, the connecting ends of the inner surrounding tube section 102 and the expansion chamber 7 jointly form a working medium outlet 5 of the heating tube bundle 4, and the outer surrounding tube section 101 and/or the inner surrounding tube section 102 are provided with an inner recessed tube section 103.
It should be noted that all the tube sections of the heating tube section 10 may be the inner concave tube section 103; or a partial section of the heating tube 10 may be the inner concave section 103 and the remaining sections of the heating tube 10 are straight sections.
It should be further noted that the entire pipe section and the local pipe section of the heating pipe 10 are twisted circumferentially along the central axis of the heating pipe bundle 4 to form a twisted pipe section, so that the heating pipe 10 has a longer heating pipe diameter circumferentially, the disturbance to the flue gas flow field in the heating chamber 2 is enhanced, and the heat exchange effect of the heating pipe 10 in the flue gas flow field is further enhanced. The circumferential twisting direction may be counterclockwise rotation around the central axis of the heating tube bundle 4 or clockwise rotation, the circumferential twisting angle is not limited, and all or part of the tube sections of the heating tube 10 are formed with circumferential twisting, the inner concave tube section 103 may be formed with circumferential twisting, and/or the straight tube section is formed with circumferential twisting. For example, referring to fig. 5, the inner surrounding pipe segment 102 and the outer surrounding pipe segment 101 are both formed with the inner concave pipe segment 103, and the inner surrounding pipe segment 102 and the outer surrounding pipe segment 101 are both circumferentially twisted; or referring to fig. 6, the inner peripheral pipe section 102 is a straight pipe section without circumferential torsion, and the outer peripheral pipe section 101 is formed with an inner concave pipe section 103 and is circumferentially twisted; or referring to fig. 7, the lower half pipe section of the inner surrounding pipe section 102 is a straight pipe section, the upper half pipe section of the inner surrounding pipe section 102 is formed with an inner concave pipe section 103, the inner surrounding pipe section 102 has no torsion, and the outer surrounding pipe section 101 is a straight pipe section and is circumferentially twisted. The above description is only three specific embodiments of the heating tube, and the structural form of the heating tube 10 is various, and will not be described herein.
The shape of the heating chamber 2 of the stirling engine is not limited, and referring to fig. 1 and 12, the heating chamber 2 may be cylindrical or rectangular parallelepiped, or may have another shape, for example, a circular truncated cone. The circumferential arrangement shape of the heating tube bundle 4 is not limited, and in order to meet the compactness of the stirling engine, as a preferred embodiment, the circumferential arrangement shape of the heating tube bundle 4 is consistent with the shape of the heating chamber 2, for example: the heating chamber 2 is cylindrical, and the circumferential arrangement shape of the heating tube bundle 4 is a circular arrangement shape as shown in fig. 8; alternatively, the heating chamber 2 may be rectangular in shape, and the heating tube bundle 4 may be arranged in a circumferential direction in a rectangular ring shape as shown in fig. 9. In addition, fig. 8 and 9 are only for illustrating the arrangement shape of the heating tube bundle 4.
It should be noted that the working medium inlets 6 are annularly arranged in a single layer or concentrically arranged in multiple layers around the central axis of the heating tube bundle 4, and the working medium outlets 5 are annularly arranged in a single layer or concentrically arranged in multiple layers around the central axis of the heating tube bundle 4. As a preferred embodiment, referring to fig. 10 and 11, the working medium inlets 6 are annularly arranged in a single layer around the central axis of the heating tube bundle 4, the working medium outlets 5 are annularly arranged in a single layer or concentrically arranged in multiple layers around the central axis of the heating tube bundle 4, because the working medium inlets 6 are located at the periphery relative to the working medium outlets 5, the circumferential length of the annularly arranged working medium inlets 6 is larger than the circumferential length of the annularly arranged working medium outlets 5, when the working medium inlets 6 are annularly arranged in a single layer, the single-layer annularly arranged working medium outlets 5 located at the periphery may cause that the inner peripheral tube segments 102 are too compact with each other, which affects heat exchange, or even cannot be arranged, in this case, the working medium outlets 5 are annularly arranged in multiple layers to increase the interval between the inner peripheral tube segments 102.
Referring to fig. 1, be provided with a plurality of flue gas entry 1 on the lateral wall that is close to its bottom on heating chamber 2, and axial evenly distributed, be provided with a plurality of exhanst gas outlets 3 on heating chamber 2's top outer wall, exhanst gas outlet 3 is along heating chamber 2's the central axis circumference evenly distributed, make high temperature flue gas can get into heating chamber 2 bottom and heating tube cluster 4 heat exchange through a plurality of exhanst gas entry 1, discharge from heating chamber 2's top by a plurality of exhanst gas outlets 3 again, be favorable to realizing the abundant heat transfer of flue gas and intraductal working medium, the thermal utilization efficiency of flue gas has been improved.
Further, referring to fig. 1 and 4, an included angle between an inlet axis of the flue gas inlet 1 and a tangent line of an outer side wall of the heating chamber 2 at the position where the flue gas inlet 1 is arranged is 20-50 °, so that high-temperature flue gas has better fluidity when entering the heating chamber 2 from the flue gas inlet 1, the heat exchange effect with the heating tube bundle 4 is enhanced, and an inlet axis of the flue gas outlet 3 is perpendicular to the outer wall of the top of the heating chamber 2, so that the high-temperature flue gas after heat exchange can be timely discharged out of the heating chamber 2, the new high-temperature flue gas in the heating chamber 2 and the heat of the heating tube bundle 4 are prevented from being taken away, and the heat exchange effect of the stirling engine heater is reduced.
It should be noted that, fins or ribs are arranged on the outer wall of the heating pipe 10 to increase the external heat exchange area of the heating pipe 10, enhance the disturbance of the heating pipe 10 to the flue gas flow field inside the heating chamber 2, enhance the heat exchange effect of the heating pipe 10, and improve the heat exchange efficiency.
In addition, as a preferred embodiment of the present invention, fins or ribs may also be arranged on the inner wall of the heating chamber 2 to enhance the disturbance to the flow field of the flue gas therein and enhance the heat exchange effect of the heating tube bundle 4.
The stirling engine to which the stirling engine heater of the present invention can be adapted is not limited in structure, and may be an α -type, a β -type, or a γ -type, and the number of cylinders of the stirling engine is not limited, and may be a single cylinder or multiple cylinders.
In order to better understand the technical scheme and the technical effect of the invention, the following embodiments are compared with the prior art:
the basic parameters of a 1kW beta-type Stirling engine are used for theoretical and numerical simulation calculation, the adopted heaters are a straight-line tube cluster type heater in the prior art, a first embodiment and a second embodiment of the Stirling engine heater provided by the invention, a heat source is high-temperature flue gas generated by burning natural gas, the high-temperature flue gas enters from the upper end face of a heating chamber, exchanges heat with a working medium in the heating tube cluster, then flows out from the lower end face of the heating chamber, a gas working medium enters the heating tube cluster from a working medium inlet, absorbs heat and enters an expansion chamber from a working medium outlet to do work through expansion.
Prior art inline cluster heater
The flue gas heating chamber has a diameter of 110mm and a height of 142 mm. The heating tube cluster of the direct-discharge tube cluster type heater consists of 28 single tubes, the wall thickness of the tube is 0.5mm, the inner diameter is 3mm, the outer diameter is 4mm, the average tube length is 192.3mm, and the total heat exchange area of high-temperature flue gas and the outer tube wall is 72795mm 2 The total heat exchange area of the working medium and the inner pipe wall is 54522mm 2 。
The temperature of the high-temperature flue gas is 1582K, and the high-temperature flue gas enters the heating chamber at the speed of 1.15 m/s. The working medium with the temperature of 600K enters the heating pipe at the speed of 5m/s to absorb heat, then flows out of the working medium outlet 5 to enter the expansion cavity, the working medium temperature of the working medium outlet is 1260K through numerical simulation calculation, and the temperature difference of the working medium inlet and outlet is 660K.
Example one
The heating tube bundle 2 of the heater in the first embodiment is heated by forming the concave tube section 103The tubes 10 are arranged such that there is no circumferential twisting of the heating tube 10. The flue gas heating chamber 2 has a diameter of 110mm and a height of 142 mm. The heating tube bundle 4 consists of 28 single tubes, the wall thickness of the tube is 0.5mm, the inner diameter is 3mm, the outer diameter is 4mm, the average tube length is 239.6mm, and the total heat exchange area of the high-temperature flue gas and the outer tube wall is 84390mm 2 The total heat exchange area of the working medium and the inner pipe wall is 63119mm 2 。
The temperature of the high-temperature flue gas is 1582K, and the high-temperature flue gas enters the heating chamber 2 at the speed of 1.15 m/s. The working medium with the temperature of 600K enters the heating pipe 10 at the speed of 5m/s to absorb heat, then flows out of the working medium outlet 5 to enter the expansion cavity 7, the temperature of the working medium at the working medium outlet 5 is 1400K, and the temperature difference between the working medium inlet and the working medium outlet is 800K.
Example two
The heating tube bundle 2 of the heater in the second embodiment is composed of the heating tubes 10 formed with the inner concave section 103, and the heating tubes 10 are twisted in the circumferential direction. The flue gas heating chamber 2 has a diameter of 110mm and a height of 142 mm. The heating tube bundle 4 consists of 28 single tubes, the wall thickness of the tube is 0.5mm, the inner diameter is 3mm, the outer diameter is 4mm, the average tube length is 259.3mm, and the total heat exchange area of the high-temperature flue gas and the outer tube wall is 91250mm 2 The total heat exchange area of the working medium and the inner pipe wall is 68436mm 2 。
The temperature of the high-temperature flue gas is 1582K, and the high-temperature flue gas enters the heating chamber 2 at the speed of 1.15 m/s. The working medium with the temperature of 600K enters the heating pipe 10 at the speed of 5m/s to absorb heat, then flows out of the working medium outlet 5 to enter the expansion chamber 7, the working medium temperature of the working medium outlet 5 is 1450K through numerical simulation calculation, and the temperature difference between the working medium inlet and the working medium outlet is 850K.
Compared with the test values of the direct-exhaust tube cluster heater in the prior art, the test values of the first embodiment and the second embodiment of the stirling engine heater of the invention are that the heating tube 10 is provided with the inward-concave tube section 103, but under the condition that the heating tube 10 is not twisted in the circumferential direction, the average tube length of the heating tube 10 is increased by 24.6%, the total heat exchange area of the outer tube wall of the heating tube cluster 4 is increased by 15.9%, the total heat exchange area of the inner tube wall is increased by 15.8%, and the temperature rise temperature is increased by 21.2%; when the heating tube 10 is provided with the inward-concave tube section 103 and the heating tube 10 is twisted in the circumferential direction, the average tube length of the heating tube 10 is increased by 34.8%, the total heat exchange area of the outer tube wall of the heating tube bundle 4 is increased by 25.3%, the total heat exchange area of the inner tube wall is increased by 25.5%, and the temperature rise temperature is increased by 28.8%. By adopting the inner concave pipe section 103 on the heating pipe 10, the heating pipe diameter of the working medium is prolonged in the space of the established heating chamber 2, and the heat exchange area of the working medium is increased. The Stirling engine has a good disturbance effect on a flue gas flow field, the heat exchange effect of the heater is improved, the expansion work capacity of the Stirling engine is improved, and the efficiency of the Stirling engine is improved on the premise of not influencing the compactness of the engine. On the basis that the heating pipe 10 is provided with the inner concave pipe section 103, the heating pipe 10 is twisted in the circumferential direction, the heat exchange area of the heating pipe cluster 4 can be further increased, the working medium outlet temperature at the working medium outlet 5 of the heater is further increased, and the expansion acting capacity of the Stirling engine is enhanced.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. The invention is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims (10)

1. The utility model provides a stirling engine heater, its characterized in that, includes heating chamber (2), flue gas inlet (1), exhanst gas outlet (3) and heating tube cluster (4), flue gas inlet (1) with exhanst gas outlet (3) set up on the outer wall of heating chamber (2), heating tube cluster (4) are set up at its outside heating chamber (2) encircle and surround, regenerator (8) are connected in working medium inlet (6) of heating tube cluster (4), expansion chamber (7) are connected in working medium outlet (5) of heating tube cluster (4), heating tube cluster (4) are encircleed by a plurality of heating pipes (10) the central axis circumference of heating tube cluster (4) is arranged and is constituteed, heating pipe (10) are formed with indent pipeline section (103).
2. A stirling engine heater according to claim 1, wherein the concave section (103) is an arc-shaped concave section, and the arc-shaped concave section is offset from bottom to top towards a central axis of the heating tube bundle (4) or an inner side wall of the heating chamber (2).
3. A stirling engine heater according to claim 1, wherein the heating tube (10) comprises an outer peripheral tube section (101) and an inner peripheral tube section (102), one end of the outer peripheral tube section (101) and one end of the inner peripheral tube section (102) are in communication, the other end of the outer peripheral tube section (101) is connected to the regenerator (8), the other end of the inner peripheral tube section (102) is connected to the expansion chamber (7), and the outer peripheral tube section (101) and/or the inner peripheral tube section (102) are formed with the inner concave tube section (103).
4. A stirling engine heater according to claim 1, wherein all segments of the heating tube (10) are the inner concave segments (103); or
The heating pipe is characterized in that a local pipe section of the heating pipe (10) is the inner concave pipe section (103), and the rest pipe sections of the heating pipe (10) are straight pipe sections.
5. A Stirling engine heater according to any one of claims 1 to 4, wherein the whole or part of the heating tube (10) is twisted circumferentially along the central axis of the heating tube bundle (4) to form a twisted tube section.
6. A Stirling engine heater according to any one of claims 1 to 4, wherein the working fluid inlet (6) is arranged in a single layer or in a plurality of layers concentrically around the central axis of the heating tube bundle (4), and the working fluid outlet (5) is arranged in a single layer or in a plurality of layers concentrically around the central axis of the heating tube bundle (4).
7. A stirling engine heater according to claim 1, wherein a plurality of said flue gas inlets (1) are arranged on the outer side wall of the heating chamber (2) near the bottom thereof and are evenly distributed circumferentially, and a plurality of said flue gas outlets (3) are arranged on the top outer wall of the heating chamber (2), said flue gas outlets (3) being evenly distributed circumferentially along the central axis of the heating chamber (2).
8. A Stirling engine heater according to claim 7, wherein the inlet axis of the flue gas inlet (1) is at an angle of 20-50 ° to the tangent of the outer side wall of the heating chamber (2) where the flue gas inlet (1) is located, and the inlet axis of the flue gas outlet (3) is perpendicular to the top outer wall of the heating chamber (2).
9. A stirling engine heater according to claim 1, wherein the outer wall of the heating tube (10) is provided with fins or ribbing.
10. A stirling engine heater according to claim 1, wherein fins or ribbing are arranged on the inner wall of the heating chamber (2).
CN202210685631.6A 2022-03-09 2022-06-16 Stirling engine heater Active CN115075979B (en)

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050103015A1 (en) * 2003-10-01 2005-05-19 Toyota Jidosha Kabushiki Kaisha Stirling engine and hybrid system that uses the stirling engine
CN102705188A (en) * 2012-05-23 2012-10-03 南京航空航天大学 Solar energy-gas complementary generating device and method
DE102012007782A1 (en) * 2012-04-20 2013-10-24 Karl-A. Tschörtner Heater head structure for force heat machine e.g. stirling engine, has working gas flow channel which is connected with working cylinder space by connecting one side end of radially inner hole with other side end of radially outer hole
CN107131073A (en) * 2017-05-16 2017-09-05 湖南科技大学 A kind of disc type solar energy Stirling thermal engine operating tube bundle formula heat dump design method
DE102016206281A1 (en) * 2016-04-14 2017-10-19 Mahle International Gmbh Heater head for a hot gas engine
CN108194222A (en) * 2018-02-08 2018-06-22 南京航空航天大学 Using the double acting Stirling engine of composite heat power supply
CN109404160A (en) * 2018-11-01 2019-03-01 浙江大学 The cellular-type Stirling engine heater of thermal source complementary type
CN109488480A (en) * 2019-01-09 2019-03-19 王壮 A kind of biomass energy recycling system
CN113586280A (en) * 2021-08-16 2021-11-02 内蒙古工业大学 Full-spectrum absorption Stirling heat absorber for converting infrared light into visible light

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050103015A1 (en) * 2003-10-01 2005-05-19 Toyota Jidosha Kabushiki Kaisha Stirling engine and hybrid system that uses the stirling engine
DE102012007782A1 (en) * 2012-04-20 2013-10-24 Karl-A. Tschörtner Heater head structure for force heat machine e.g. stirling engine, has working gas flow channel which is connected with working cylinder space by connecting one side end of radially inner hole with other side end of radially outer hole
CN102705188A (en) * 2012-05-23 2012-10-03 南京航空航天大学 Solar energy-gas complementary generating device and method
DE102016206281A1 (en) * 2016-04-14 2017-10-19 Mahle International Gmbh Heater head for a hot gas engine
CN107131073A (en) * 2017-05-16 2017-09-05 湖南科技大学 A kind of disc type solar energy Stirling thermal engine operating tube bundle formula heat dump design method
CN108194222A (en) * 2018-02-08 2018-06-22 南京航空航天大学 Using the double acting Stirling engine of composite heat power supply
CN109404160A (en) * 2018-11-01 2019-03-01 浙江大学 The cellular-type Stirling engine heater of thermal source complementary type
CN109488480A (en) * 2019-01-09 2019-03-19 王壮 A kind of biomass energy recycling system
CN113586280A (en) * 2021-08-16 2021-11-02 内蒙古工业大学 Full-spectrum absorption Stirling heat absorber for converting infrared light into visible light

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
辛凤;刘志春;郑年本;刘鹏;刘伟;: "斯特林机加热管交变流动强化传热模拟研究", 工程热物理学报, no. 11, pages 1 *

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