CN111120056A - Noise elimination type thermoelectric generation system heat exchanger with metal foam structure - Google Patents

Noise elimination type thermoelectric generation system heat exchanger with metal foam structure Download PDF

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Publication number
CN111120056A
CN111120056A CN201911240116.1A CN201911240116A CN111120056A CN 111120056 A CN111120056 A CN 111120056A CN 201911240116 A CN201911240116 A CN 201911240116A CN 111120056 A CN111120056 A CN 111120056A
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CN
China
Prior art keywords
metal foam
heat exchanger
foam structure
expansion chamber
generation system
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
CN201911240116.1A
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Chinese (zh)
Inventor
徐闻
田华
舒歌群
马孝楠
石凌峰
王轩
张洪飞
康克
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Tianjin University
Original Assignee
Tianjin University
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 Tianjin University filed Critical Tianjin University
Priority to CN201911240116.1A priority Critical patent/CN111120056A/en
Publication of CN111120056A publication Critical patent/CN111120056A/en
Pending legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N5/00Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy
    • F01N5/02Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy the devices using heat
    • F01N5/025Exhaust or silencing apparatus combined or associated with devices profiting from exhaust energy the devices using heat the device being thermoelectric generators
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N1/00Silencing apparatus characterised by method of silencing
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01NGAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N13/00Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
    • F01N13/007Apparatus used as intake or exhaust silencer
    • 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
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/12Improving ICE efficiencies

Abstract

The invention discloses a silencing type thermoelectric power generation system heat exchanger with a metal foam structure. The heat exchanger has a three-part cavity structure, a head resistance silencing expansion chamber and a tail resistance silencing expansion chamber, and a middle resistance silencing cavity filled with a metal foam structure. The metal foam structure is in a regular hexagon column shape, two holes, namely a cylindrical hole and an elliptic cylinder hole, are arranged in the middle of the metal foam structure and are respectively used as an air inlet pipeline hole and an air outlet pipeline hole, and a circle of trapezoidal structure holes are arranged around the metal foam structure and are used as a channel for air to flow back to the front expansion cavity from the rear expansion cavity. Gas can produce great torrent when the resistive cavity passageway of metal foam structure flows through to fully the heat transfer with the metal foam near the wall, conduct the heat to the hot wall of heat exchanger rapidly, thereby let the thermoelectric generation module who pastes the outer wall turn into the electric energy with it. Meanwhile, the porous structure of the metal foam enables the metal foam to have good vibration absorption capacity, so that the metal foam can be used as a resistive silencing cavity, and the heat exchanger has good silencing performance.

Description

Noise elimination type thermoelectric generation system heat exchanger with metal foam structure
Technical Field
The invention belongs to the field of automobile exhaust waste heat thermoelectric generation, and particularly relates to a silencing type thermoelectric generation system heat exchanger with a metal foam structure.
Background
The waste heat energy of the tail gas of the automobile accounts for about one third of the total energy of the fuel oil consumed by the automobile, and the waste heat energy contained in the tail gas can be recovered by utilizing the related waste heat recovery technology. The thermoelectric power generation technology can directly convert waste heat energy into electric energy, has the advantages of simple structure, small size, light weight, stable operation, no noise, long service life and the like, and is a technology with a very promising prospect.
In a thermoelectric power generation system, one of the most central components is a hot-end heat exchanger, which assumes the prominent responsibility of transferring heat from the exhaust gas to the thermoelectric power generation module. The traditional temperature difference power generation system is basically installed behind a catalytic converter and in front of an exhaust muffler of an automobile as an independent system. However, the space of the automobile chassis is very limited, and a large amount of space is occupied by post-treatment devices such as a DPF, a muffler, a three-way catalyst and the like. If the complete set of components of the thermoelectric power generation system is added, the spatial arrangement of the chassis is extremely difficult. Thus, if the thermoelectric generation system is integrated with components in the aftertreatment system, the space it occupies may be greatly reduced.
The metal foam material has very high specific surface area per unit volume and a complex framework structure, so that on one hand, the heat exchange area and the flowing turbulence degree of the metal foam material can be improved, and the heat exchange performance of the heat exchanger can be greatly enhanced if the metal foam material is properly applied; on the other hand, the metal foam material has countless micropores on the surface and inside, and the micropores are communicated with each other, so that the metal foam material can interfere and destroy sound waves in the transmission process, and is a good resistive silencing material. The muffling type thermoelectric power generation system heat exchanger with the metal foam structure can fully utilize the advantages of metal foam, well integrate the hot end heat exchanger and the muffler of the thermoelectric power generation system, directly replace the muffler in the original vehicle aftertreatment system, ensure the excellent performances of the two, and remarkably save the occupied chassis space.
Disclosure of Invention
Aiming at the problems, the invention provides a silencing type thermoelectric power generation heat exchanger with a metal foam structure, which has the functions of an impedance composite silencer and a thermoelectric power generation system hot end heat exchanger, and can obviously improve the efficiency and the system integration level of a thermoelectric power generation system.
In order to realize the aim of the invention, the invention provides an anechoic thermoelectric generation system heat exchanger with a metal foam structure,
the heat exchanger comprises three cavities which are connected in sequence: the front resistance expansion chamber, the resistance silencing cavity and the rear resistance expansion chamber;
an air inlet circular pipe is inserted into the heat exchanger from one end of the heat exchanger, sequentially passes through the front resistant expansion chamber and the resistive silencing cavity, and extends to the rear resistant expansion chamber; the air outlet elliptical tube is inserted into the heat exchanger from the other end of the heat exchanger, sequentially passes through the rear resistant expansion chamber and the resistive silencing cavity and extends to the front resistant expansion chamber; the circular air inlet pipe and the elliptical air outlet pipe are both partial perforated pipes, wherein the opening area of the circular air inlet pipe is a part located in the resistive silencing cavity and the rear resistant expansion chamber; the perforated area of the air outlet elliptical tube is positioned in the front expansion chamber and the resistive silencing chamber part;
the resistive silencing cavity is formed by filling a metal foam structure, and the metal foam structure comprises a gas inlet circular tube hole, a gas outlet elliptical tube hole and a gas backflow trapezoidal hole which are communicated with the front-position resistant expansion chamber and the rear-position resistant expansion chamber;
the hot end of the thermoelectric generation module is tightly attached to the outer wall surface of the heat exchanger, and the cold end of the thermoelectric generation module is tightly attached to the cooling water channel.
Wherein: the shell of the heat exchanger is a regular hexagon cylindrical cavity, and two ends of the shell are closed.
Wherein: six gas backflow trapezoidal holes are formed, and the gas backflow trapezoidal holes are evenly arranged at intervals.
Wherein: the metal foam structure has a porosity of between 0.7 and 0.98 and a cell density of between 10 and 100 PPI.
Wherein: the metal foam structure is made of copper, aluminum, nickel or other alloys.
Wherein: and the metal foam structure and the heat exchanger shell are welded or connected in other connection modes with small contact thermal resistance.
Wherein: the hole diameter of the circular air inlet pipe can be 1-10mm, the hole opening distance is 5-30mm, and the circular air inlet pipe can be designed according to the actual conditions of pipe diameter, flow rate and the like.
Wherein: the hole diameter of the air outlet oval pipe can be 1-10mm, the hole distance is 5-30mm, and the air outlet oval pipe can be designed according to the actual conditions of pipe diameter, flow rate and the like.
Compared with the prior art, the invention has the beneficial effects that 1, the silencer structure of the automobile and the heat exchanger structure of the temperature difference power generation system are integrated, so that the space of the automobile chassis occupied by the temperature difference power generation device is greatly reduced, and the integration and the efficiency of the system are improved. 2. The gas flow route in the whole muffling heat exchanger is in a backflow state, the flow velocity of gas at the position can be reduced due to the metal foam trapezoid hole structure of the backflow section and the structural characteristics of metal foam, turbulence is enhanced, and therefore the heat exchange capacity of the muffling heat exchanger is greatly improved. 3. The muffling heat exchanger comprises various structural types such as a round pipe, an elliptical pipe, a trapezoidal pore channel, a regular hexagon cylindrical expansion cavity, a metal foam structural resistive cavity and the like, so that the muffling heat exchanger has a good muffling effect on noise of a very wide frequency band, and can replace an original muffler on a vehicle.
Drawings
The figure is a schematic structural diagram of the muffling type thermoelectric power generation system heat exchanger with a metal foam structure according to a preferred embodiment of the invention.
And the second drawing is a longitudinal section view of the heat exchanger of the silencing type thermoelectric power generation system with the metal foam structure.
FIG. three is a side cross-sectional view of an anechoic thermoelectric generation heat exchanger with a metal foam structure.
In the figure: 1-circular air inlet pipe, 2-front resistance expansion chamber, 3-trapezoidal hole, 4-resistance silencing cavity, 5-outer wall surface of heat exchanger, 6-rear resistance expansion chamber, 7-oval air outlet pipe and 8-temperature difference power generation module.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when used in this specification the singular forms "a", "an" and/or "the" include "specify the presence of stated features, steps, operations, elements, or modules, components, and/or combinations thereof, unless the context clearly indicates otherwise.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
This embodiment provides a regular hexagon tubular structure heat exchanger, inside three cavitys that contain: the front and the back resistance silencing cavities and the middle resistance silencing cavity 4. The middle resistive muffling cavity 4 is filled with a metal foam material structure, the middle part of the structure is provided with a round hole and an elliptical hole which are respectively used as a channel of the air inlet circular tube 1 and a channel of the air outlet elliptical tube 7 and are respectively in transition fit connection with the air inlet circular tube 1 and the air outlet elliptical tube 7, and six trapezoidal holes 3 are formed around the structure and are used as channels for enabling tail gas to flow back to the front resistive expansion chamber 2 from the front resistive expansion chamber 2. The partial structure is also a main part for heat exchange. The hot end of the thermoelectric generation module 8 is tightly attached to the outer wall surface of the regular hexagon cylinder, and the cold end is tightly attached to the cooling water flow channel to form the whole thermoelectric generation system. Wherein, there is no pipe wall structure around the metal foam structure at the trapezoidal hole 3.
Wherein, the air inlet circular tube 1 extending out of the rear position resistant expansion chamber 6 is a perforated tube and forms a resistant silencing cavity together with the rear position resistant expansion chamber 6. Wherein, the front position resistance expansion chamber 2 and the trapezoid holes 3 around the metal foam form a second resistance silencing cavity.
Wherein, the circular air inlet pipe 1 and the elliptical air outlet pipe 7 can be both made of stainless steel materials,
as shown in fig. 1-3, when in use, automobile exhaust flows from the circular air inlet pipe 1, passes through the middle resistive muffling cavity 4 section and flows into the rear resistive expansion chamber 6. The gas then flows back through the trapezoidal holes 3 of the resistive muffler chamber section to the front resistive expansion chamber 2. Finally, the gas flows out through the gas outlet elliptical tube 7. The thermoelectric power generation module 8 is attached to the outer wall surface 5 of the heat exchanger, and the cooling mode of the module suggests water cooling, so that the cold end and the hot end of the thermoelectric power generation module can generate large temperature difference, thereby realizing thermoelectric power generation.
In the flowing process, firstly, when the tail gas passes through the resistive silencing cavity section of the circular air inlet pipe, the noise (mainly a middle-high frequency range) of the tail gas can be partially eliminated, and when the tail gas flows into the rear expansion chamber from the air inlet pipe, the low-frequency noise of the tail gas can be partially eliminated due to sudden change of the section. Then, the tail gas flows into the metal foam trapezoid holes of the resistive silencing cavity section, and exhaust noise is greatly reduced due to diffuse reflection of sound waves on the surface of the foam copper and the principles of expansion silencing, micropore silencing and the like. Meanwhile, the flowing speed of the gas is low relative to that of the gas inlet pipeline, and due to the permeability of the metal foam and the complexity of the framework, the gas can fully exchange heat with the gas, so that the heat exchange performance is greatly improved, and the temperature of the hot end of the thermoelectric power generation module attached to the outer wall surface is greatly improved. The gas flows into the front expansion chamber from the trapezoidal pore passage, and the change of the flow section can perform reactive noise elimination once again, so that the medium and low frequency noise is further reduced. Finally, when the gas flows through the gas outlet oval tube, the overall noise level is further reduced due to the existence of the perforated tube and the resistive cavity.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (8)

1. The utility model provides an anechoic type thermoelectric generation system heat exchanger with metal foam structure which characterized in that:
the heat exchanger comprises three cavities which are connected in sequence: the front resistance expansion chamber, the resistance silencing cavity and the rear resistance expansion chamber;
an air inlet circular pipe is inserted into the heat exchanger from one end of the heat exchanger, sequentially passes through the front resistant expansion chamber and the resistive silencing cavity, and extends to the rear resistant expansion chamber; the air outlet elliptical tube is inserted into the heat exchanger from the other end of the heat exchanger, sequentially passes through the rear resistant expansion chamber and the resistive silencing cavity and extends to the front resistant expansion chamber; the circular air inlet pipe and the elliptical air outlet pipe are both partial perforated pipes, wherein the opening area of the circular air inlet pipe is a part located in the resistive silencing cavity and the rear resistant expansion chamber; the perforated area of the air outlet elliptical tube is positioned in the front expansion chamber and the resistive silencing chamber part;
the resistive silencing cavity is formed by filling a metal foam structure, and the metal foam structure comprises a gas inlet circular tube hole, a gas outlet elliptical tube hole and a gas backflow trapezoidal hole which are communicated with the front-position resistant expansion chamber and the rear-position resistant expansion chamber;
the hot end of the thermoelectric generation module is tightly attached to the outer wall surface of the heat exchanger, and the cold end of the thermoelectric generation module is tightly attached to the cooling water channel.
2. The muffling type thermoelectric generation system heat exchanger with a metal foam structure of claim 1, wherein: the shell of the heat exchanger is a regular hexagon cylindrical cavity, and two ends of the shell are closed.
3. The muffling type thermoelectric generation system heat exchanger with a metal foam structure of claim 2, wherein: six gas backflow trapezoidal holes are formed, and the gas backflow trapezoidal holes are evenly arranged at intervals.
4. The muffling type thermoelectric generation system heat exchanger with a metal foam structure of claim 1, wherein: the metal foam structure has a porosity of between 0.7 and 0.98 and a cell density of between 10 and 100 PPI.
5. The muffling type thermoelectric generation system heat exchanger with a metal foam structure of claim 1, wherein: the metal foam structure is made of copper, aluminum, nickel or other alloys.
6. The muffling type thermoelectric generation system heat exchanger with a metal foam structure of claim 1, wherein: and the metal foam structure and the heat exchanger shell are welded or connected in other connection modes with small contact thermal resistance.
7. The muffling type thermoelectric generation system heat exchanger with a metal foam structure of claim 1, wherein: the hole diameter of the circular air inlet pipe can be 1-10mm, the hole opening distance is 5-30mm, and the circular air inlet pipe can be designed according to the actual conditions of pipe diameter, flow rate and the like.
8. The muffling type thermoelectric generation system heat exchanger with a metal foam structure of claim 1, wherein: the hole diameter of the air outlet oval pipe can be 1-10mm, the hole distance is 5-30mm, and the air outlet oval pipe can be designed according to the actual conditions of pipe diameter, flow rate and the like.
CN201911240116.1A 2019-12-06 2019-12-06 Noise elimination type thermoelectric generation system heat exchanger with metal foam structure Pending CN111120056A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911240116.1A CN111120056A (en) 2019-12-06 2019-12-06 Noise elimination type thermoelectric generation system heat exchanger with metal foam structure

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Application Number Priority Date Filing Date Title
CN201911240116.1A CN111120056A (en) 2019-12-06 2019-12-06 Noise elimination type thermoelectric generation system heat exchanger with metal foam structure

Publications (1)

Publication Number Publication Date
CN111120056A true CN111120056A (en) 2020-05-08

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CN201911240116.1A Pending CN111120056A (en) 2019-12-06 2019-12-06 Noise elimination type thermoelectric generation system heat exchanger with metal foam structure

Country Status (1)

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101384798A (en) * 2005-12-22 2009-03-11 巴斯福催化剂公司 Muffler assembly having a metal catalyst therein
DE202010003049U1 (en) * 2010-03-03 2010-07-08 Emcon Technologies Germany (Augsburg) Gmbh Device for exhaust heat utilization
CN203879579U (en) * 2014-03-31 2014-10-15 长城汽车股份有限公司 Silencer and automobile with the same
CN104266531A (en) * 2014-10-09 2015-01-07 中国石油大学(华东) Multichannel structure using metal foam to uniformly distribute fluid flow
CN104895655A (en) * 2015-05-14 2015-09-09 中国第一汽车股份有限公司 Efficient automobile exhaust thermoelectricity recovery device
CN107476863A (en) * 2016-06-07 2017-12-15 东北林业大学 Automobile complex muffler system with energy saving and emission reduction effects
CN108798829A (en) * 2017-05-03 2018-11-13 贵港市厚顺信息技术有限公司 Foam metal muffler

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101384798A (en) * 2005-12-22 2009-03-11 巴斯福催化剂公司 Muffler assembly having a metal catalyst therein
DE202010003049U1 (en) * 2010-03-03 2010-07-08 Emcon Technologies Germany (Augsburg) Gmbh Device for exhaust heat utilization
CN203879579U (en) * 2014-03-31 2014-10-15 长城汽车股份有限公司 Silencer and automobile with the same
CN104266531A (en) * 2014-10-09 2015-01-07 中国石油大学(华东) Multichannel structure using metal foam to uniformly distribute fluid flow
CN104895655A (en) * 2015-05-14 2015-09-09 中国第一汽车股份有限公司 Efficient automobile exhaust thermoelectricity recovery device
CN107476863A (en) * 2016-06-07 2017-12-15 东北林业大学 Automobile complex muffler system with energy saving and emission reduction effects
CN108798829A (en) * 2017-05-03 2018-11-13 贵港市厚顺信息技术有限公司 Foam metal muffler

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