CN108278600B - Combined microscale regenerative burner - Google Patents
Combined microscale regenerative burner Download PDFInfo
- Publication number
- CN108278600B CN108278600B CN201810126097.9A CN201810126097A CN108278600B CN 108278600 B CN108278600 B CN 108278600B CN 201810126097 A CN201810126097 A CN 201810126097A CN 108278600 B CN108278600 B CN 108278600B
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- combustion chamber
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- partition
- chamber
- mixing chamber
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- 230000001172 regenerating effect Effects 0.000 title claims abstract description 20
- 238000002485 combustion reaction Methods 0.000 claims abstract description 94
- 238000005192 partition Methods 0.000 claims abstract description 60
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 3
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 20
- 230000000694 effects Effects 0.000 description 5
- 238000007789 sealing Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000368 destabilizing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 150000003254 radicals Chemical class 0.000 description 1
- 238000009991 scouring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000002912 waste gas Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/62—Mixing devices; Mixing 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
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Gas Burners (AREA)
Abstract
The invention belongs to the field of energy utilization and provides a combined micro-scale regenerative burner which comprises a combustion chamber and a mixing chamber, wherein the combustion chamber is of a hollow cuboid structure, two mutually parallel partition boards are arranged in the combustion chamber and divide the combustion chamber into three channels, an air inlet channel is formed between the two partition boards, two air outlet channels are formed between the partition boards and the left wall and the right wall of the combustion chamber, a combustion area is formed between the top of the partition boards and the top wall of the mixing chamber, the mixing chamber is arranged at the bottom of the combustion chamber, the top of the mixing chamber is communicated with the air inlet channel, the bottom of the mixing chamber is communicated with the air inlet, and the bottom of the partition boards is clamped in a rectangular groove on the inner wall of the mixing chamber.
Description
Technical Field
The invention belongs to the field of energy utilization, and particularly relates to a combined micro-scale regenerative burner.
Background
As micro-Power devices are widely used in industry, medical, home and military fields, micro-Power electromechanical system (Power MEMS) technology has attracted attention from researchers. However, a key bottleneck in these MEMS technologies is the cumbersome power generation device. Therefore, a micro-scale power supply with high energy density is particularly important. Currently, a series of developments have been made for this device, and various forms of micro-power devices have been developed, such as micro-thermoelectric devices, micro free piston engines, micro rotary engines, micro thermal photovoltaic systems (MTPV), and the like. Among the various micro-powered devices, micro-thermal photovoltaic (MTPV) systems are considered one of the most promising technologies because it does not include any moving parts, is simple in structure and easy to assemble. The basic principle is that hydrocarbon fuel burns in a micro-combustor and releases heat, and when the wall surface of the micro-combustor is heated to high temperature, the wall surface of the micro-combustor radiates a certain number of photons to strike the surface of a photocell, so that electric energy is generated.
As a core component of the micro thermoelectric system, namely the micro burner, whether the internal tissue burns sufficiently or not can obviously influence the temperature distribution condition of the outer wall surface of the burner, thereby influencing the electric energy output of the system. Furthermore, microscale combustion, unlike conventional-scale combustion, also presents design challenges. Firstly, under the micro-scale combustion condition, the residence time of the premixed gas in the burner is short, and the complete reaction difficulty is increased. Second, microcombustors have a high surface area to volume ratio, and heat and free radical quenching may occur, destabilizing combustion and causing extinction. Finally, micro-combustors can create difficulties in wear, assembly and sealing due to very small tolerances.
In order to achieve stable combustion in micro-combustors, various methods have been employed to enhance the combustion process. For example, various burners disclosed in patent application No. 201310014966.1 (patent name "a porous medium regenerative micro burner"), patent application No. 201310540863.3 (name "a porous medium-filled bidirectional air-intake regenerative micro burner") basically realize micro-scale regenerative combustion by reasonable design on an air intake mode and an internal flow section, and play roles in prolonging fuel residence time and improving combustion effect in a micro-scale state to a certain extent. But the micro heat returning type burner is organized to be charged, and the heat returning effect and the combustion efficiency are required to be further optimized.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a combined micro-scale regenerative burner, which aims to realize efficient and stable combustion and higher radiant energy of the wall surface of a combustion chamber.
The present invention achieves the above technical object by the following means.
The combined micro-scale regenerative burner comprises a combustion chamber, wherein the combustion chamber is of a hollow cuboid structure, the top end of the combustion chamber is closed, the bottom end of the combustion chamber is open, and the outer wall of the combustion chamber comprises a front side wall, a rear side wall, a left side wall, a right side wall and a top wall;
two mutually parallel partition boards are arranged in the combustion chamber, the partition boards are detachably connected with the front wall and the rear wall of the combustion chamber, an air inlet channel is formed in an area between the partition boards, a first air outlet channel is formed between the partition board on the left side and the left wall of the combustion chamber, a second air outlet channel is formed between the partition board on the right side and the right wall of the combustion chamber, the air inlet channel can preheat two sides of the air outlet channels on two sides uniformly, and the generation of the asymmetric combustion phenomenon is reduced.
The length of the partition board is smaller than the height of the combustion chamber, so that a combustion area is formed in the area between the top end of the partition board and the top wall of the combustion chamber, the mixed gas generates stable backflow in the suddenly-expanded combustion area, the backflow exists, the mixed gas and the burnt mixed gas can be formed to alternately circulate, and the burnt mixed gas ignites the unburned mixed gas.
Preferably, the device further comprises a mixing chamber, wherein a mixing cavity is arranged in the mixing chamber, the bottom of the mixing cavity is gradually expanded from the top to the bottom, an air inlet is arranged at the bottom of the mixing chamber and communicated with the bottom of the mixing cavity, and rectangular grooves are formed in two opposite side walls of the mixing chamber;
the bottom of the mixing chamber is connected with the top of the combustion chamber, the bottom ends of the two partition boards are respectively clamped in rectangular grooves on two side walls of the mixing chamber, and the mixing chamber is communicated with the air inlet channel.
Preferably, the bottom of the left wall and the right wall of the combustion chamber are provided with first fixing plates, the first fixing plates are provided with first screw holes, the two sides of the top of the mixing chamber are provided with second fixing plates which can be attached to the first fixing plates, the second fixing plates are provided with second screw holes, the first fixing plates are attached to the second fixing plates, the bolts are in threaded connection with the first screw holes and the second screw holes, and nuts are connected to the bolts.
Preferably, the mixing chamber is trapezoidal block-shaped.
Preferably, the partition is parallel to the left and right walls of the combustion chamber.
Preferably, the distance between the partitions and the left and right walls of the combustion chamber are equal.
Preferably, the inner sides of the front wall and the rear wall of the combustion chamber are provided with rectangular partition slots along the height direction of the combustion chamber.
Preferably, the partition plate is in snap-in connection with the front wall and the rear wall of the combustion chamber through partition plate slots.
Preferably, the separator is made of nickel material.
Preferably, the length of the partition plate can be selected according to the requirement, and the size of the combustion zone is variable according to the different lengths of the partition plates.
The invention has the beneficial effects that:
1) The partition plate divides the combustion chamber into three channels, and tail gas in the two exhaust channels fully preheats fresh mixed gas in the middle air inlet channel, so that the combustion efficiency is improved; meanwhile, due to the existence of the partition plates, the disturbance and scouring degree of the mixed gas in the first exhaust channel and the second exhaust channel are enhanced, so that the convection heat exchange coefficient between the high-temperature mixed gas and the wall surface of the combustion chamber is greatly improved, and the stable combustion flow speed range is greatly improved.
2) Because the baffle top forms the sudden expansion structure between the combustion chamber and the inner wall of the combustion chamber for the mixed gas forms the circulation flow in this region and flows with burnt mixed gas alternation, makes burnt mixed gas ignite unburned mixed gas, forms and continuously steadily burns, improves the stability of combustion process greatly.
3) The invention adopts a sectional mode to assemble each mixing chamber and the combustion chamber, and simultaneously can realize the free assembly of the combustion chamber and the partition plate. The sealing device has the characteristics of simple structure, few parts, good sealing performance, easy processing and assembly and the like;
4) The invention can freely select the partition boards with different lengths to be assembled into the burner, and realizes the optimization of the wall surface radiation temperature of the combustion chamber and the length of the optimal partition board which is uniformly distributed, thereby improving the wall surface radiation efficiency.
Drawings
Fig. 1 is a schematic structural diagram of a combined micro-scale regenerative burner according to the present invention.
FIG. 2 is a schematic view of a combustion chamber according to the present invention.
Fig. 3 is a schematic structural view of the mixing chamber according to the present invention.
In the figure:
1. a mixing chamber; 2. a combustion chamber; 3, a bolt; 4. a partition plate; 5. an air intake passage; 6a, a first exhaust passage; 6b, a second exhaust passage; 7. a combustion zone; 8. a separator slot; 9. a first fixing plate; 10. a first screw hole; 11. an air inlet; 12. a second fixing plate; 13. a second screw hole; 14. a mixing chamber.
Detailed Description
The invention will be further described with reference to the drawings and the specific embodiments, but the scope of the invention is not limited thereto.
As shown in fig. 1, the combined micro-scale regenerative burner comprises a mixing chamber 1 and a combustion chamber 2, wherein the combustion chamber 2 is of a hollow cuboid structure, the top end is closed, the bottom end is open, and the outer wall of the combustion chamber 2 comprises front and rear side walls, left and right side walls and a top wall.
As shown in fig. 2, two parallel partition boards 4 are arranged in the combustion chamber 2, rectangular partition board slots 8 are arranged on the inner sides of the front wall and the rear wall of the combustion chamber 2 along the height direction of the combustion chamber 2, and the partition boards 4 are connected with the front wall and the rear wall of the combustion chamber 2 in a clamping mode through the partition board slots 8. The length of the partition 4 is smaller than the height of the combustion chamber 2 so that the area of the abrupt expansion between the top end of the partition 4 and the top wall of the combustion chamber 2 forms a combustion zone 7.
The partition plates 4 are made of nickel material, the partition plates 4 are parallel to the left wall and the right wall of the combustion chamber 2, and the distances between the partition plates 4 and the left wall and the right wall of the combustion chamber 2 are equal. The area between the two partition boards 4 forms an air inlet channel 5, a first air outlet channel 6a is formed between the partition board 4 on the left side and the left wall of the combustion chamber 2, a second air outlet channel 6b is formed between the partition board 4 on the right side and the right wall of the combustion chamber 2, and the air inlet channel 5 is positioned in the middle of the two air outlet channels, so that the air inlet channel 5 can be used for uniformly preheating the air outlet channels on the two sides, and the generation of the asymmetric combustion phenomenon is reduced. .
As shown in fig. 3, the mixing chamber 1 is in a trapezoid block shape, a mixing chamber 14 is arranged in the mixing chamber 1, the shape of the mixing chamber 14 is the same as that of the mixing chamber 1, the bottom of the mixing chamber is gradually expanded to the top, an air inlet 11 is arranged at the bottom of the mixing chamber 1, the air inlet 11 is communicated with the bottom of the mixing chamber 14, and rectangular grooves are formed in two opposite side walls of the mixing chamber 1.
The bottom of mixing chamber 1 is connected with the top of combustion chamber 2, and the bottom of the left wall of combustion chamber 2 and right wall all is equipped with first fixed plate 9, is equipped with first screw 10 on the first fixed plate 9, and the top both sides of mixing chamber 1 are equipped with the second fixed plate 12 that can laminate mutually with first fixed plate 9, are equipped with second screw 13 on the second fixed plate 12, and first fixed plate 9 is not only the same with the second fixed plate 12 size, and their surface is patted through 10A electric spark moreover, guarantees high accuracy surface and bonds each other, plays the sealed effect in mixing chamber 14 top. The bolt 3 is screwed with the first screw hole 10 and the second screw hole 13, a nut is connected to the bolt 3, and the nut cannot interfere with the inclined side of the mixing chamber 1. The bottom ends of the two baffles 4 are respectively clamped in rectangular grooves on the two side walls of the mixing chamber 1, and the mixing cavity 14 is communicated with the air inlet channel 5. The cooperation of baffle 4 and baffle slot 8 and rectangle recess is transition fit, plays good sealed effect.
In the invention, two partition boards 4 are inserted into the partition board slots 8, and the bottom end is reserved with a length of 2mm so as to be connected with the rectangular grooves on the mixing chamber 1. Then, the partition plate 4 with the length of 2mm reserved at the bottom end is inserted into the rectangular groove of the mixing chamber 1, the lamination condition of the first fixing plate 9 and the second fixing plate 12 is checked, and the assembly bolt 3 is started after good sealing is confirmed. Finally, two sets of bolts respectively pass through the first screw hole 10 and the second screw hole 13 to connect the first fixing plate 9 with the second fixing plate 12.
During the whole combustion process, the premixed fuel and the oxidant are uniformly mixed again in the mixing chamber 14 through the air inlet 11, and rapidly come to the combustion chamber air inlet passage 5 under the action of air pressure, and are accelerated to the top along the partition plate 4 until being ignited in the combustion zone 7, wherein stable combustion is achieved. The high-temperature combustion tail gas comes to the first exhaust channel 6a and the second exhaust channel 6b at the other side of the partition board 4, and continuously preheats fresh mixed gas of the exhaust channels at the two sides through heat conduction of the partition board 4, so that ignition is easier, the tail gas temperature is effectively reduced, the wall temperature of the combustion chamber 2 is improved, and the comprehensive utilization of waste heat of waste gas is realized.
Compared with a straight-channel burner, the enthalpy value of the premixed gas of the combined type regenerative burner is improved, and the stability and the combustible flow velocity range of the combustion process are greatly improved. Meanwhile, due to the effect of the partition plate 4, more heat in the tail gas is transferred to the premixed gas, so that comprehensive utilization of energy is realized. This tends to increase the total energy radiated from the outer wall of the burner, thereby positively affecting the efficiency of the micro thermoelectric system.
The examples are preferred embodiments of the present invention, but the present invention is not limited to the above-described embodiments, and any obvious modifications, substitutions or variations that can be made by one skilled in the art without departing from the spirit of the present invention are within the scope of the present invention.
Claims (8)
1. The combined micro-scale regenerative burner is characterized by comprising a combustion chamber (2) and a mixing chamber (1), wherein the combustion chamber (2) is of a hollow cuboid structure, the top end is closed, the bottom end is open, and the outer wall of the combustion chamber (2) comprises a front side wall, a rear side wall, a left side wall, a right side wall and a top wall;
two mutually parallel partition boards (4) are arranged in the combustion chamber (2), the partition boards (4) are parallel to the left wall and the right wall of the combustion chamber (2), the partition boards (4) are detachably connected with the front wall and the rear wall of the combustion chamber (2), the length of the partition boards (4) is smaller than the height of the combustion chamber (2), and a combustion area (7) is formed between the top end of the partition boards (4) and the top wall of the combustion chamber (2);
an air inlet channel (5) is formed in the area between the two partition boards (4), a first air outlet channel (6 a) is formed between the partition board (4) on the left side and the left wall of the combustion chamber (2), and a second air outlet channel (6 b) is formed between the partition board (4) on the right side and the right wall of the combustion chamber (2);
a mixing cavity (14) is arranged in the mixing chamber (1), the bottom of the mixing cavity (14) is gradually expanded from the top to the bottom, an air inlet (11) is formed in the bottom of the mixing chamber (1), the air inlet (11) is communicated with the bottom of the mixing cavity (14), and rectangular grooves are formed in two opposite side walls of the mixing chamber (1);
the bottom of the mixing chamber (1) is connected with the top of the combustion chamber (2), the bottom ends of the two partition boards (4) are respectively clamped in rectangular grooves of two side walls on the mixing chamber (1), and the mixing cavity (14) is communicated with the air inlet channel (5).
2. The combined type micro-scale regenerative burner according to claim 1, wherein the bottom ends of the left wall and the right wall of the combustion chamber (2) are respectively provided with a first fixing plate (9), the first fixing plates (9) are provided with first screw holes (10), the two sides of the top of the mixing chamber (1) are provided with second fixing plates (12) which can be attached to the first fixing plates (9), the second fixing plates (12) are provided with second screw holes (13), the first fixing plates (9) are attached to the second fixing plates (12), the bolts (3) are in threaded connection with the first screw holes (10) and the second screw holes (13), and nuts are connected to the bolts (3).
3. The combined microscale regenerative burner according to claim 1, wherein the mixing chamber (1) is a trapezoidal block.
4. The combination microscale regenerative burner according to claim 1, wherein the distance between the partitions (4) and the left and right walls of the combustion chamber (2) is equal.
5. The combined micro-scale regenerative burner according to claim 1, wherein the inner sides of the front wall and the rear wall of the combustion chamber (2) are provided with rectangular partition slots (8) along the height direction of the combustion chamber (2).
6. The combined micro-scale regenerative burner according to claim 5, wherein the partition plate (4) is snap-in connected with the front wall and the rear wall of the combustion chamber (2) through partition plate slots (8).
7. The combined micro-scale regenerative burner according to claim 1, wherein the partition (4) is made of nickel material.
8. The combined micro-scale regenerative burner according to claim 1, wherein the length of the partition (4) is selectable as desired.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810126097.9A CN108278600B (en) | 2018-02-08 | 2018-02-08 | Combined microscale regenerative burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810126097.9A CN108278600B (en) | 2018-02-08 | 2018-02-08 | Combined microscale regenerative burner |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108278600A CN108278600A (en) | 2018-07-13 |
| CN108278600B true CN108278600B (en) | 2024-02-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810126097.9A Active CN108278600B (en) | 2018-02-08 | 2018-02-08 | Combined microscale regenerative burner |
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| Country | Link |
|---|---|
| CN (1) | CN108278600B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103090384A (en) * | 2013-01-16 | 2013-05-08 | 江苏大学 | Regenerative microscale burner filled with porous media |
| CN204153777U (en) * | 2014-09-23 | 2015-02-11 | 江苏嘉和热系统股份有限公司 | A kind of multi-channel miniature burner of built-in parallel baffle |
| CN104595899A (en) * | 2015-01-27 | 2015-05-06 | 北京工业大学 | Micro-miniature catalytic burner taking foam metal as catalyst structure substrate |
| CN105066128A (en) * | 2015-08-25 | 2015-11-18 | 江苏大学 | Double-layer backheating type micro-combustor |
| CN105864766A (en) * | 2016-04-26 | 2016-08-17 | 华中科技大学 | Multi-channel combustor |
| CN208058829U (en) * | 2018-02-08 | 2018-11-06 | 江苏大学 | A kind of combined type minute yardstick backheating type burner |
-
2018
- 2018-02-08 CN CN201810126097.9A patent/CN108278600B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103090384A (en) * | 2013-01-16 | 2013-05-08 | 江苏大学 | Regenerative microscale burner filled with porous media |
| CN204153777U (en) * | 2014-09-23 | 2015-02-11 | 江苏嘉和热系统股份有限公司 | A kind of multi-channel miniature burner of built-in parallel baffle |
| CN104595899A (en) * | 2015-01-27 | 2015-05-06 | 北京工业大学 | Micro-miniature catalytic burner taking foam metal as catalyst structure substrate |
| CN105066128A (en) * | 2015-08-25 | 2015-11-18 | 江苏大学 | Double-layer backheating type micro-combustor |
| CN105864766A (en) * | 2016-04-26 | 2016-08-17 | 华中科技大学 | Multi-channel combustor |
| CN208058829U (en) * | 2018-02-08 | 2018-11-06 | 江苏大学 | A kind of combined type minute yardstick backheating type burner |
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| Publication number | Publication date |
|---|---|
| CN108278600A (en) | 2018-07-13 |
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