CN102678325A - Microminiature thermoelectricity generating set based on combustion - Google Patents
Microminiature thermoelectricity generating set based on combustion Download PDFInfo
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- CN102678325A CN102678325A CN2012101485208A CN201210148520A CN102678325A CN 102678325 A CN102678325 A CN 102678325A CN 2012101485208 A CN2012101485208 A CN 2012101485208A CN 201210148520 A CN201210148520 A CN 201210148520A CN 102678325 A CN102678325 A CN 102678325A
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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Abstract
The invention discloses a microminiature thermoelectricity generating set, which comprises four preheating channels, a blunt body flame stabilizer, a combustion chamber and a thermoelectricity module, wherein the preheating channels and the combustion chamber are all flat, the cross section of a blunt body is triangular or semicircular, and is installed at an inlet of the combustion chamber, and the thermoelectricity module is arranged between the two preheating channels. Staggered fins can be arranged in the preheating channels. The preferable value of the width ratio of the blunt body to the combustion chamber is 0.3-0.6. According to the microminiature thermoelectricity generating set, the defects in the prior art are overcome, gas is used to cool cold ends of the thermoelectricity modules in the first preheating channel and the third preheating channel, the gas is used to heat hot ends of the thermoelectricity modules in the second preheating channel and the forth preheating channel, thus no additional cooling power needs to be provided, and the system efficiency is enhanced. Meanwhile, ignition energy can be lowered by preheating in two times, the ignition delay time is shortened, the heat radiation loss is reduced, and the combustion efficiency is improved. A low-speed and high-temperature recirculation zone formed behind the blunt body can efficiently stabilize the flame. The microminiature thermoelectricity generating set is widely used in various types of microminiature power systems.
Description
Technical field
The invention belongs to miniature scale thermoelectric power generation technical field, refer in particular to the electricity generating device that power supply is provided for the microminiature power plant.
Background technique
The various microelectromechanical systems (MEMS) that continue to bring out; Like portable electric appts such as minute vehicle, miniature propulsion system, microrobot, microsensor and mobile phones, characteristics such as require that its power system will possess that volume is little, in light weight, energy density is big and easy to use.Traditional chemical cell exists shortcomings such as weight is big, energy density is little, service time is short, the duration of charge is long, the demand that can not be competent at this respect fully; And the energy density of hydrogen and hydrocarbon fuels is higher tens times than chemical cell.Therefore, have the great potential of competing, caused domestic and international researcher's extensive concern with chemical cell based on the microminiature power generation system of burning.
Thermoelectric conversion is the direct generation mode of most convenient.Its principle is a thermoelectric effect, and promptly when the two ends of electrothermal module temperature was unequal, electronics in the material or hole can be moved to low temperature area by the high-temperature zone, thereby produces electric current or electric charge accumulation.Thermoelectric conversion system is made up of thermal source, low-temperature receiver and electrothermal module.The advantage of this electricity-generating method be in light weight, volume is little, do not have rotatable parts, do not have wearing and tearing, noise free, so can use for a long time, safe and reliable.The heat that at present existing researcher utilizes burning to produce generates electricity through electrothermal module, but efficient is generally lower, and the highest also have only about 1%.This mainly is because too for a short time the causing of the temperature difference of electrothermal module cool and heat ends.In order to form the bigger cool and heat ends temperature difference, generally can take dual mode.A kind of is passive type, strengthens heat radiation through install metal fin additional at cold junction, reduces cold junction temperature.For example, the research group of Singapore has promptly adopted this mode.Its shortcoming is volume, weight and the cost of meeting increase system.Another kind is active, drives water or air carries out forced-convection heat transfer to cold junction through pump or fan, thereby reduces cold junction temperature.For example, the thermoelectric heat generation system of Chinese Academy of Sciences Guangzhou Energy Research Institute's exploitation has just adopted water cooling plant.Yet this mode has not only increased the structure complexity, and needs to consume extra power, has therefore reduced the efficient of system.Therefore, the cold junction type of cooling that still need seek better electrothermal module.
In addition, in the microminiature thermoelectric heat generation system based on burning, the stability of flame is another problem that needs emphasis to consider.This is because in the mini combustion device; Because the long-pending ratio (face body ratio) with volume of combustor surface is wanted big two to three one magnitude with respect to conventional yardstick; Make the ratio of the radiation loss through wall increase greatly, the free radicals of chemical reaction is also increased by the probability of catching of combustion chamber wall surface greatly simultaneously, therefore; The flame stability variation takes place flame-out easily.In addition, the firing chamber physical dimension is too little, and the gaseous mixture waiting time therein is short, and fuel and air often have little time complete reaction and just be blown the firing chamber, not only causes combustion efficiency to reduce, and the blow-off limit of fuel is also dwindled with steady combustion scope greatly.In order to improve the stability of flame in the mini combustion device, the main several kinds of ways such as thermal cycle, catalytic reaction, combustor surface passivation, the steady combustion in recirculating zone that adopt of researchers.Yet single smooth burning method does not reach optimum efficiency, the steady combustion mode that needs two or more modes of exploitation to combine.
Given this, the microminiature thermoelectric heat generation system based on burning also has two large problems to need to be resolved hurrily at present, and promptly effectively cold junction cooling means and smooth burning method efficiently the present invention proposes a kind of new system that can solve these two problems simultaneously.
Summary of the invention
The objective of the invention is for a kind of microminiature gaseous combustion thermoelectric generating device is provided, this electricity generating device has compact structure, surely fires the characteristics of wide ranges, combustion efficiency height and stable and reliable operation.
A kind of microminiature thermoelectric generating device based on burning provided by the invention is characterized in that this device comprises first to fourth preheating passage; Baffle flame-holder; Firing chamber, and first, second electrothermal module, first to fourth preheating passage and firing chamber are plate;
Baffle flame-holder is installed in the inlet of firing chamber, and the bluff body cross section is triangle or half round post; First electrothermal module is between first preheating passage and the 3rd preheating passage; The inlet of first preheating passage is used to feed fuel or fuel as first suction port, and the outlet of first preheating passage is connected with the inlet of the 3rd preheating passage, and the inlet of the 3rd preheating passage communicates with the import of firing chamber;
Second electrothermal module is between second preheating passage and the 4th preheating passage; The inlet of second preheating passage is used for bubbling air or fuel as second suction port, and the outlet of second preheating passage is connected with the inlet of the 4th preheating passage, and the inlet of the 4th preheating passage communicates with the import of firing chamber.
As the improvement of technique scheme, in first to fourth preheating passage, all arrange fork row fin.
As the further improvement of technique scheme, the ratio of the width of baffle flame-holder and the width of firing chamber is between 0.3 to 0.6.
The present invention has the following advantages: (1) fuel, air or their premix gas are under the initial pressure effect; In first, second preheating passage, the electrothermal module cold junction is cooled off; Not only need not consume the extra power amount, and can also carry out preliminary preheating the premix gas of cold conditions.(2) the 3rd, a side of the 4th preheating passage contacts with the burner wall, and opposite side is as the hot junction of electrothermal module, thereby has avoided electrothermal module directly to contact with the combustion chamber wall surface of high temperature, has protected electrothermal module.In addition, can also carry out further preheating to gas.(3) comprised simultaneously in the steady combustion mode of burner to the two-stage preheating of low temperature unburned gas and based on the recirculating zone of bluff body and surely fired dual mode.Therefore, can reduce the required energy of igniting, shorten ignition delay time, the scope of surely firing is also wideer.(4) do not have moving element in the whole system, therefore do not have wearing and tearing, noise free, increased stability, reliability and the Security of device operation greatly.(5) the present invention be advantageous in that it both had been applicable to premixed combustion, also be applicable to non-premixed combustion, specifically adopt which kind of combustion manner reasonably to select according to actual conditions.(6) characteristic size of apparatus of the present invention is little, is millimeter level or micron order.In a word, the present invention has made full use of two kinds of steady combustion modes of unreacted fuel gas preheating and bluff body recirculating zone and has enlarged steady combustion scope, has improved the stability of device, adaptable across various microminiature power systems.
Description of drawings
Fig. 1 is a two-dimensional structure schematic representation of the present invention:
Wherein 1,2 be respectively first, second suction port, 3,4,5,6 are respectively first to fourth preheating passage, and 7 is the firing chamber import; 8 is baffle flame-holder, and 9,10,11,12 is fin, and 13 is the firing chamber; 14,15 be respectively first, second electrothermal module, 16 is burner outlet
Fig. 2 is a fin distribution schematic diagram of the present invention.
Fig. 3 is the 3 d effect graph of Fig. 1.
Embodiment
In order to make the object of the invention, technological scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
As shown in Figure 1; Microminiature thermoelectric generating device provided by the invention comprises first to fourth preheating passage 3,4,5,6, baffle flame-holder 8, firing chamber 13; And first, second electrothermal module 14,15, first to fourth preheating passages 3,4,5,6 and firing chamber 13 are plate.
Baffle flame-holder 8 is installed in the inlet of firing chamber 13, and the bluff body cross section is triangle or half round post.Practice shows, the ratio of the width W of width w of baffle flame-holder 8 (being the length on triangle base or the diameter of semicolumn) and firing chamber 13 is 0.3 between 0.6 the time, and it is better surely to fire effect.
First electrothermal module 14 is between first preheating passage 3 and the 3rd preheating passage 5; The inlet of first preheating passage 3 is used to feed fuel or fuel as first suction port 1, and the outlet of first preheating passage 3 is connected with the inlet of the 3rd preheating passage 5, and the inlet of the 3rd preheating passage 5 communicates with the import of firing chamber 13.
Second electrothermal module 15 is between second preheating passage 4 and the 4th preheating passage 6; The inlet of second preheating passage 4 is used for bubbling air or fuel as second suction port 2, and the outlet of second preheating passage 4 is connected with the inlet of the 4th preheating passage 6, and the inlet of the 4th preheating passage 6 communicates with the import of firing chamber 13.
For forced heat exchanging, can in first to fourth preheating passage 3,4,5,6, arrange fork row fin 9,10,11 and 12, the position distribution of fin on wall is as shown in Figure 2.
Fuel and air when premixed combustion mode (adopt non-) or their premixture (when adopting the premixed combustion mode) respectively from import 1 with 2 through preheating passage 3,4,, the import 7 of the plate micro combustor 13 of 5 and 6 entering; In baffle flame-holder 8 rear ignition; High-temperature gas is passed to the 3rd, the 4th preheating passage 5,6 through the wall and the fin of firing chamber 13 with heat, and tail gas is discharged through combustor exit 16.The premixed flow of fuel and air or they when first to fourth preheating passage, with fin 9,10,11 and 12 abundant heat exchange, make a part of heat that burning produces through wall and fin to fuel and air perhaps their premix gas carry out preheating.Gas temperature in first, second preheating passage 3,4 is lower, is used for cooling off the cold junction of electrothermal module 14 and 15.Three, the gas temperature of 5,6 li of the 4th preheating passages is higher, as the thermal source of electrothermal module 14 and 15, is exported with 15 by electrothermal module 14 by the electromotive force that the temperature difference produces.
Those skilled in the art will readily understand; The above is merely preferred embodiment of the present invention; Not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, be equal to and replace and improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. the microminiature thermoelectric generating device based on burning is characterized in that this device comprises first to fourth preheating passage, baffle flame-holder, and firing chamber, and first, second electrothermal module, first to fourth preheating passage and firing chamber are plate;
Baffle flame-holder is installed in the inlet of firing chamber, and the bluff body cross section is triangle or half round post; First electrothermal module is between first preheating passage and the 3rd preheating passage; The inlet of first preheating passage is used to feed fuel or fuel as first suction port, and the outlet of first preheating passage is connected with the inlet of the 3rd preheating passage, and the inlet of the 3rd preheating passage communicates with the import of firing chamber;
Second electrothermal module is between second preheating passage and the 4th preheating passage; The inlet of second preheating passage is used for bubbling air or fuel as second suction port, and the outlet of second preheating passage is connected with the inlet of the 4th preheating passage, and the inlet of the 4th preheating passage communicates with the import of firing chamber.
2. the microminiature thermoelectric generating device based on burning according to claim 1 is characterized in that, in first to fourth preheating passage, all arranges fork row fin.
3. the microminiature thermoelectric generating device based on burning according to claim 1 is characterized in that the ratio of the width of baffle flame-holder and the width of firing chamber is between 0.3 to 0.6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101485208A CN102678325A (en) | 2012-05-14 | 2012-05-14 | Microminiature thermoelectricity generating set based on combustion |
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| CN2012101485208A CN102678325A (en) | 2012-05-14 | 2012-05-14 | Microminiature thermoelectricity generating set based on combustion |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475268A (en) * | 2013-09-03 | 2013-12-25 | 华中科技大学 | Micro-burning electric generating device |
| CN104296139A (en) * | 2014-09-23 | 2015-01-21 | 江苏嘉和热系统股份有限公司 | Multi-channel mini-type burner internally provided with parallel partition plates |
| CN104482547A (en) * | 2014-12-08 | 2015-04-01 | 重庆大学 | Direct alkali metal pyroelectricity conversion device utilizing industrial waste gas as heat source |
| CN104848217A (en) * | 2015-04-29 | 2015-08-19 | 中国科学院力学研究所 | Combustion chamber head of hypersonic high-enthalpy ground simulation equipment |
| CN107726302A (en) * | 2017-09-25 | 2018-02-23 | 华中科技大学 | The micro-burner of flame holding is strengthened in a kind of gas preheating |
| CN113654043A (en) * | 2021-08-20 | 2021-11-16 | 贵州大学 | Multi-combustion-chamber coupled microscale combustion power generation device |
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| CN1644985A (en) * | 2005-01-07 | 2005-07-27 | 清华大学 | Counterflow heat exchanging burners |
| CN101645677A (en) * | 2009-09-01 | 2010-02-10 | 中国科学院广州能源研究所 | Minisize thermoelectric generator |
| DE102010030259A1 (en) * | 2010-06-18 | 2011-12-22 | Bayerische Motoren Werke Aktiengesellschaft | Thermoelectric module for internal combustion engine of motor car, has semiconductor elements that are arranged in interstice formed between hot and cold sides, where remaining volume of interstice is filled by insulating material |
| CN202160135U (en) * | 2011-08-17 | 2012-03-07 | 中国科学院广州能源研究所 | Compact micro power generation device based on combustion |
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2012
- 2012-05-14 CN CN2012101485208A patent/CN102678325A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1644985A (en) * | 2005-01-07 | 2005-07-27 | 清华大学 | Counterflow heat exchanging burners |
| CN101645677A (en) * | 2009-09-01 | 2010-02-10 | 中国科学院广州能源研究所 | Minisize thermoelectric generator |
| DE102010030259A1 (en) * | 2010-06-18 | 2011-12-22 | Bayerische Motoren Werke Aktiengesellschaft | Thermoelectric module for internal combustion engine of motor car, has semiconductor elements that are arranged in interstice formed between hot and cold sides, where remaining volume of interstice is filled by insulating material |
| CN202160135U (en) * | 2011-08-17 | 2012-03-07 | 中国科学院广州能源研究所 | Compact micro power generation device based on combustion |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475268A (en) * | 2013-09-03 | 2013-12-25 | 华中科技大学 | Micro-burning electric generating device |
| CN103475268B (en) * | 2013-09-03 | 2016-04-20 | 华中科技大学 | A kind of micro-combustion Blast Furnace Top Gas Recovery Turbine Unit (TRT) |
| CN104296139A (en) * | 2014-09-23 | 2015-01-21 | 江苏嘉和热系统股份有限公司 | Multi-channel mini-type burner internally provided with parallel partition plates |
| CN104482547A (en) * | 2014-12-08 | 2015-04-01 | 重庆大学 | Direct alkali metal pyroelectricity conversion device utilizing industrial waste gas as heat source |
| CN104848217A (en) * | 2015-04-29 | 2015-08-19 | 中国科学院力学研究所 | Combustion chamber head of hypersonic high-enthalpy ground simulation equipment |
| CN107726302A (en) * | 2017-09-25 | 2018-02-23 | 华中科技大学 | The micro-burner of flame holding is strengthened in a kind of gas preheating |
| CN113654043A (en) * | 2021-08-20 | 2021-11-16 | 贵州大学 | Multi-combustion-chamber coupled microscale combustion power generation device |
| CN113654043B (en) * | 2021-08-20 | 2023-07-14 | 贵州大学 | Multi-combustion-chamber-coupled microscale combustion power generation device |
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Application publication date: 20120919 |