CN110594729B - Liquid fuel porous medium burner and using method - Google Patents
Liquid fuel porous medium burner and using method Download PDFInfo
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- CN110594729B CN110594729B CN201910943333.0A CN201910943333A CN110594729B CN 110594729 B CN110594729 B CN 110594729B CN 201910943333 A CN201910943333 A CN 201910943333A CN 110594729 B CN110594729 B CN 110594729B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
- F23D11/36—Details, e.g. burner cooling means, noise reduction means
- F23D11/44—Preheating devices; Vaporising devices
- F23D11/441—Vaporising devices incorporated with burners
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Wick-Type Burners And Burners With Porous Materials (AREA)
- Spray-Type Burners (AREA)
Abstract
A liquid fuel porous medium burner and its operation method, including the air admission draft tube, the rear end of the air admission draft tube connects with second combustion chamber; a primary combustion chamber is arranged in the air inlet guide cylinder, a fuel evaporation sleeve is arranged in the primary combustion chamber, and the front end of the fuel evaporation sleeve is connected with a combustion chamber cover; a first ribbed plate is arranged at the rear end of the primary combustion chamber, a second ribbed plate is arranged at the rear end of the air inlet guide cylinder, and a first porous medium is arranged between the outlet at the rear end of the primary combustion chamber and the inlet of the secondary combustion chamber; a gap between the air inlet guide cylinder and the primary combustion chamber forms an air channel, and a plurality of rows of air inlets are circumferentially arranged on the side wall of the primary combustion chamber; the side wall of the fuel evaporation sleeve is provided with a steam fuel outlet. The invention can completely evaporate fuel into fuel steam, fully mix and burn the fuel steam and air, is not easy to generate carbon deposition, reduces the emission of pollutants and improves the combustion efficiency.
Description
Technical Field
The invention relates to the technical field of fuel burners, in particular to a liquid fuel porous medium burner and a using method thereof.
Background
The fuel oil heater is used as a heating device independent of the engine and can heat the interior of the automobile so as to keep the interior of the automobile at a certain temperature; meanwhile, the engine can be preheated, so that the engine is easy to start, the emission level of an automobile is reduced, the abrasion of a friction pair is reduced, and the service life of the engine is prolonged. Have been widely used in vehicles operating in low-temperature environments, such as automobiles and ships.
A burner, which is a core component of a combustion heater, has a great influence on fuel combustion efficiency, and thus, improving fuel combustion efficiency is an important method for improving the efficiency of the combustion heater. The pre-evaporation combustion technology is a more advanced and available combustion technology, so that the combustion efficiency of fuel oil is improved.
The combustion efficiency is improved by using a fuel evaporation technology at the present stage, after the fuel is evaporated, the fuel steam in the central area of the combustion chamber is far away from the air inlet hole of the wall of the combustion chamber, and the fuel steam in the central area of the combustion chamber is insufficiently mixed with air, so that the fuel cannot be sufficiently combusted; patent 201510641333.7 provides a "camping burning heating stove", and the device burning is stable after, and liquid fuel absorbs the heat, takes place the vaporization, is equipped with the steady flow piece and has improved fuel steam and air mixing degree, and when the air was not enough in the combustion process when the gas mixture, can't provide the air, makes the burning insufficient, reduces combustion efficiency.
Disclosure of Invention
The invention aims to provide a liquid fuel porous medium burner and a using method thereof.
In order to achieve the purpose, the invention adopts the technical scheme that:
a liquid fuel porous medium burner comprises an air inlet guide cylinder, wherein the rear end of the air inlet guide cylinder is connected with a secondary combustion chamber; a primary combustion chamber is arranged in the air inlet guide cylinder, a combustion chamber cover is arranged at the front end of the primary combustion chamber, an oil groove is arranged on the inner wall of the combustion chamber cover, an ignition mechanism is arranged in the primary combustion chamber, and an oil absorption porous medium is arranged on the inner surface of the combustion chamber cover; a fuel evaporation sleeve is arranged on the central line in the primary combustion chamber, and the front end of the fuel evaporation sleeve is connected with a combustion chamber cover; a second ribbed plate is arranged at the rear end of the primary combustion chamber (10), a first ribbed plate is arranged at the rear end of the air inlet guide cylinder, a second porous medium is arranged between the first ribbed plate and the second ribbed plate, and a first porous medium is arranged between the outlet at the rear end of the primary combustion chamber and the inlet of the secondary combustion chamber; the rear end of the fuel evaporation sleeve extends into the first porous medium, and the rear end of the fuel evaporation sleeve is closed; a gap between the air inlet guide cylinder and the primary combustion chamber forms an air channel, and a plurality of rows of air inlets are circumferentially arranged on the side wall of the primary combustion chamber; the side wall of the fuel evaporation sleeve is provided with a steam fuel outlet.
The invention has the further improvement that an air inlet splitter plate is arranged between the front end of the air inlet guide cylinder and the primary combustion chamber, and a plurality of air inlet holes are uniformly arranged on the air inlet splitter plate.
The invention has the further improvement that the rear end of the primary combustion chamber is provided with a second ribbed plate, the rear end of the air inlet guide cylinder is provided with a first ribbed plate, and a second porous medium is arranged between the first ribbed plate and the second ribbed plate; the second porous medium has a porosity of 0.5 to 0.8, and the first porous medium has a porosity of 0.8 to 0.95.
The fuel evaporation sleeve is internally provided with a first oil pipe which passes through the first oil supply hole and extends out of the combustion chamber cover, and the second oil supply hole is communicated with the oil groove.
The further improvement of the invention is that the porosity of the oil absorption porous medium is 0.6-0.85, the oil absorption porous medium is porous foam or porous fiber felt stainless steel, when the oil absorption porous medium is porous foam stainless steel, the average pore diameter is 0.18-0.42 mm, and when the oil absorption porous medium is porous fiber felt stainless steel, the average filament diameter is 25-40 μm.
The fuel evaporation sleeve comprises an outer pipe and an inner pipe, the inner pipe is sleeved in the outer pipe, and a plurality of steam fuel outlets are uniformly formed in the outer pipe in the circumferential direction.
The steam fuel oil outlet is further improved in that the diameter of the outer pipe is 20-30 mm, the diameter of the inner pipe is 10-16 mm, the diameter of the steam fuel oil outlet is 2-6 mm, and the distance between the end part of the inner pipe and the end part of the outer pipe is 10-20 mm.
The invention has the further improvement that a plurality of rows of air inlets are distributed along the circumferential direction of the side wall of the primary combustion chamber, the number of the air inlets in each row is gradually reduced from the end part to the tail part of the primary combustion chamber, the number of the air inlets in the first row is 11-15, and the number ratio of the air inlets in the two adjacent rows is 1: 0.7-0.8; the first exhaust air inlet hole is obliquely arranged, and the air inlet angle of the first exhaust air inlet hole forms an included angle of 30-45 degrees with the side wall of the primary combustion chamber; the diameter of each air inlet is 1.5-3 mm, and the total area of the air inlets accounts for 0.1-1% of the surface area of the side wall of the primary combustion chamber.
The invention has the further improvement that the first ribbed plate is parallel to the second ribbed plate, and the angle between the first ribbed plate and the side wall of the primary combustion chamber is 100-130 degrees; the thickness of the first porous medium is 50-80 mm, and the length of the first porous medium inserted into the rear end of the fuel evaporation sleeve is 30-60 mm; the first porous medium and the second porous medium are stainless steel or copper in a porous foam shape or a porous fiber felt shape; when the first porous medium and the second porous medium are in a porous foam shape, the average pore diameter of the foam is 0.18-0.42 mm, and when the first porous medium and the second porous medium are in a porous fiber felt shape, the average filament diameter of the fiber is 25-40 μm.
The use method of the liquid fuel porous medium evaporative burner comprises the following steps that an ignition mechanism is electrified firstly, oil is supplied to a second oil pipe when the ignition mechanism reaches a glowing state, fuel oil in the second oil pipe is supplied to an oil groove through a second oil supply hole, and the fuel oil is absorbed by an oil absorption porous medium and is uniformly diffused; the fuel oil close to the ignition mechanism is evaporated, meanwhile, a part of air is blown to the oil absorption porous medium through the first exhaust hole to accelerate the evaporation of the fuel oil, the evaporated fuel oil is mixed with the air, after the ignition mechanism reaches the ignition temperature of the mixed gas, the mixed gas is ignited and is combusted in the primary combustion chamber, and the first porous medium and the second porous medium are heated after the combustion; the other part of air enters the primary combustion chamber through the second porous medium and the first porous medium to provide secondary air for the combustion of the mixed gas, part of combustion steam is mixed with the secondary air and then is combusted in the first porous medium to heat the first porous medium, the high-temperature first porous medium heats the oil absorption porous medium through the radiation effect, so that the fuel oil in the oil absorption porous medium is quickly evaporated and mixed with the air, meanwhile, the air blown into the first porous medium enables the combustion flame to directly scour the rear end of the fuel oil evaporation sleeve, and when the ignition temperature can be maintained, the ignition mechanism is powered off; the mixed gas is combusted in the first porous medium to heat the rear end of the fuel evaporation sleeve, when the fuel evaporation sleeve reaches glowing temperature, fuel is supplied to the first oil pipe, the fuel in the first oil pipe is supplied into the inner pipe through the fuel supply hole and is sprayed into the outer pipe from the top of the inner pipe, the fuel absorbs heat at the top of the outer pipe to evaporate, and fuel steam is sprayed out from the steam fuel outlet and mixed with air in the primary combustion chamber.
Compared with the prior art, the invention has the following beneficial effects: the fuel oil evaporator has the advantages that air is blown to the oil absorption porous medium through the air intake of the first exhaust hole on the side wall of the primary combustion chamber, so that the evaporation of the fuel oil in the oil absorption porous medium can be accelerated; the burner of the invention has the advantages that the fuel evaporation sleeve is arranged at the center of the primary combustion chamber, so that the fuel is evaporated into fuel steam, the fuel steam is sprayed from the fuel steam hole to be mixed with air, and the sprayed fuel steam and the air entering the primary combustion chamber are in opposite-flushing mixing, so that the fuel steam and the air are more fully mixed. According to the invention, the first porous medium is arranged between the outlet at the rear end of the primary combustion chamber and the inlet of the secondary combustion chamber, fuel steam and air are fully mixed in the primary combustion chamber and are combusted in the porous medium, and on one hand, fuel in the oil absorption porous medium in the combustion chamber cover area is heated through radiation effect to be vaporized; on the other hand, the rear end of the fuel evaporation sleeve is inserted into the first porous medium, the rear end of the fuel evaporation sleeve is heated, the fuel supplied to the fuel evaporation sleeve is vaporized and is sprayed into the primary combustion chamber to be mixed with air; the fuel liquid which is not vaporized and is fed into the fuel evaporation sleeve part is entrained by the fuel vapor and enters the combustion chamber, and further heating is realized due to the heat radiation effect of the porous medium, so that the incomplete combustion phenomenon is prevented. According to the invention, fuel oil is evaporated to form fuel oil steam, and simultaneously the fuel oil steam is fully mixed with air blown into the primary combustion chamber, so that air can be provided secondarily when the mixed gas is combusted in the porous medium, the fuel oil is fully combusted, carbon deposition is not easy to generate, the emission of pollutants is reduced, and the combustion efficiency is improved.
Furthermore, the diameter of the outer pipe is 20-30 mm, so that the phenomenon that the heating area is too large due to too large diameter of the outer pipe, and fuel oil pyrolysis is caused is prevented; the diameter of the outer pipe is too small, so that the evaporation is incomplete, and part of unvaporized fuel liquid is entrained by fuel steam and enters a combustion chamber, so that incomplete combustion is caused; the diameter of the inner pipe is 10-16 mm, so that fuel can be sprayed to the inner surface of the end part of the outer pipe right, when the fuel supply quantity is constant, the situation that the fuel is sprayed to the inner surface of the end part of the outer pipe due to too small diameter of the inner pipe and splashes are caused when the fuel is sprayed to the inner surface of the end part of the outer pipe due to too high flow speed, fuel liquid is wrapped by fuel steam and enters a combustion chamber, and the fuel is sprayed to the inner surface of the end part of the outer pipe due to too large diameter of the inner pipe is low in flow speed; the diameter of the fuel steam hole is 2-6 mm, so that fuel steam can be rapidly sprayed out to be fully mixed with air, the situation that the mixing of the fuel steam and the air is influenced due to the fact that the flow speed of the fuel steam sprayed out from the fuel steam hole is not enough is avoided, the diameter of the hole is too small, the fuel steam stays in the fuel evaporation sleeve for too long time, and heat is absorbed too much, and fuel pyrolysis is caused; the tip of fuel evaporation sheathed tube inner tube is 10 ~ 20mm with the distance of burning steam outer tube end portion, makes the fuel can be better can spout the internal surface of outer pipe tip from the inner tube blowout, prevents that the distance is too big, makes the fuel spout the internal surface of outer pipe end portion, and the distance influences the blowout of fuel from the inner tube for a short time.
Furthermore, the angle between the air inlet holes in the first row and the side wall of the primary combustion chamber is 30-45 degrees, so that air is blown to the central area of the oil absorption porous medium, the evaporation of fuel is accelerated, the phenomenon that the air is blown to the boundary of the oil absorption porous medium due to the overlarge angle or the undersize angle is prevented, and the effect of evaporation of the fuel is not great; other air inlets are normally arranged and have the diameter of 1.5-3 mm.
Furthermore, a first porous medium is arranged between the outlet at the rear end of the primary combustion chamber and the inlet of the secondary combustion chamber, so that on one hand, the sleeve is heated, and fuel oil vaporization is facilitated; on the other hand, fuel oil in the porous medium evaporator of the combustion chamber cover area is heated through radiation effect to be vaporized; and meanwhile, the fuel steam is further heated, so that the fuel steam is mixed with air, and the full combustion is facilitated. Meanwhile, the porosity of the second porous medium between the first ribbed plate and the second ribbed plate is smaller than the porosity of the communicated necking of the primary combustion chamber and the secondary combustion chamber, so that the resistance is increased, excessive air is prevented from entering the secondary combustion chamber, and more air enters the primary combustion chamber to be fully mixed with fuel steam.
Drawings
Fig. 1 is a schematic view of the overall structure of an evaporative burner.
Fig. 2 is a schematic view of a fuel evaporation sleeve structure.
FIG. 3 is a schematic view of a combustion chamber cover.
Fig. 4 is a partially enlarged schematic view of fig. 3 at the circle.
Description of reference numerals: 1. a first oil pipe; 2. a first oil supply hole; 3. a fuel evaporation sleeve; 4. an oil absorbing porous medium; 5. an oil sump; 6. a combustion chamber cover; 7. an air inlet splitter vane; 8. an air inlet hole; 9. an air intake guide cylinder; 10. a primary combustion chamber; 11. an air inlet; 12. an air passage; 13. a first porous medium; 14. a secondary combustion chamber; 15. a second porous medium; 16. a first rib plate; 17. a second rib plate; 18. an ignition mechanism; 19. mounting holes; 20. a second oil supply hole; 21. a second oil pipe; 3-1, an outer tube; 3-2, inner tube; 3-3, steam and fuel outlet holes.
Detailed Description
The present invention will be described in further detail below with reference to the accompanying drawings.
Referring to fig. 1, 2, 3 and 4, the present invention includes an intake guide cylinder 9, and the rear end of the intake guide cylinder 9 is connected with a secondary combustion chamber 14; a primary combustion chamber 10 is arranged in the air inlet guide cylinder 9, a combustion chamber cover 6 is arranged at the front end of the primary combustion chamber 10, a first oil supply hole 2 and a second oil supply hole 20 are formed in the combustion chamber cover 6, the first oil supply hole 2 is formed in the center of the combustion chamber cover 6, a circular oil groove 5 is formed in the inner wall of the combustion chamber cover 6, the second oil supply hole 20 is communicated with the oil groove 5, a mounting hole 19 for mounting an ignition mechanism 18 is formed in the side wall of the primary combustion chamber 10, the ignition mechanism 18 extends into the primary combustion chamber 10 from the mounting hole 19 in the side wall of the primary combustion chamber 10, an oil absorption porous medium 4 is arranged on the inner wall of the combustion chamber cover 6, the oil absorption porous medium 4 is tightly attached to the inner surface of the combustion chamber cover 6, and the distance between the ignition mechanism 18 and the oil absorption porous medium 4 is 1; a fuel evaporation sleeve 3 is arranged on the central line in the primary combustion chamber 10, and the front end of the fuel evaporation sleeve 3 is in contact with a combustion chamber cover 6; the fuel evaporation sleeve 3 comprises an outer pipe 3-1 and an inner pipe 3-2, the inner pipe 3-2 is sleeved in the outer pipe 3-1, and a plurality of steam fuel outlets 3-3 are uniformly formed in the outer pipe 3-1 in the circumferential direction; an air inlet splitter vane 7 is arranged between the front end of the air inlet guide cylinder 9 and the primary combustion chamber 10, and a plurality of air inlet holes 8 are uniformly arranged on the air inlet splitter vane 7; the rear end of the first-stage combustion chamber 10 is provided with a second ribbed plate 17, the rear end of the air inlet guide cylinder 9 is provided with a first ribbed plate 16, the first ribbed plate 16 and the second ribbed plate 17 are arranged in parallel, and the first ribbed plate 16 and the side wall of the first-stage combustion chamber 10 form a certain angle of 100-130 degrees; a first porous medium 13 is arranged between the outlet at the rear end of the primary combustion chamber 10 and the inlet of the secondary combustion chamber 14, a second porous medium 15 is also arranged between the first rib 16 and the second rib 17, the porosity of the second porous medium 15 is smaller than that of the first porous medium 13, the porosity of the second porous medium 15 is 0.5-0.8, and the porosity of the first porous medium 13 is 0.8-0.95. The aperture of the second porous medium 15 is 0.12-0.24 mm, and the aperture of the first porous medium 13 is 0.18-0.3 mm. The rear end of the fuel evaporation sleeve 3 protrudes into the porous medium 13, and the rear end of the fuel evaporation sleeve 3 is closed. An air channel 12 is formed by a gap between the air inlet guide cylinder 9 and the primary combustion chamber 10, and air enters the air channel 12 through the air inlet hole 8 and then enters the fuel evaporation sleeve 3 through the second porous medium 15. A plurality of air inlets 11 are circumferentially formed in the side wall of the primary combustion chamber 10, and the first porous medium 13 is clamped and fixed with a second ribbed plate 17 at the tail of the air inlet guide cylinder 9 through a first ribbed plate 16 at the tail of the primary combustion chamber 10.
The oil absorption porous medium 4 is in a circular ring shape, the inner diameter of the circular ring is equal to the diameter of an outer pipe 3-1 of the fuel evaporation sleeve 3, the porosity of the oil absorption porous medium 4 is 0.6-0.85, the oil absorption porous medium 4 is made of porous foam or porous fiber felt-shaped stainless steel, when the oil absorption porous medium is made of the porous foam-shaped stainless steel, the average pore diameter is 0.18-0.42 mm, and when the oil absorption porous medium is made of the porous fiber felt stainless steel, the average filament diameter is 25-40 mu m.
An outer pipe 3-1 of the fuel evaporation sleeve 3 is a round pipe with a closed rear end, a plurality of steam fuel outlets 3-3 are uniformly formed in the side wall of the lower half portion of the outer pipe 3-1, and specifically, the steam fuel outlets 3-3 are formed in the side wall close to the rear end. The diameter of the outer pipe is 20-30 mm, so that the phenomenon that the heating area is too large due to the fact that the diameter of the outer pipe is too large 3-1 is avoided, and fuel oil pyrolysis is caused; the diameter of the outer pipe 3-1 is too small, so that the evaporation is incomplete, and part of unvaporized fuel liquid is entrained by fuel steam and enters the primary combustion chamber 10, so that the incomplete combustion is caused; the diameter of the inner pipe 3-2 is 10-16 mm, so that fuel can be sprayed to the inner surface of the end part of the outer pipe 3-1, when the fuel supply quantity is constant, the situation that fuel is sprayed to the inner surface of the end part of the outer pipe 3-1 due to too small diameter of the inner pipe 3-2 and splashes are caused when the fuel is sprayed to the inner surface of the end part of the outer pipe 3-1 due to too high flow speed is prevented, fuel liquid is wrapped by fuel steam and enters the primary combustion chamber 10, and the fuel flow speed is low due to too large diameter of the inner pipe 3-2 and cannot be sprayed to the inner surface of the end part of the outer pipe 3; the diameter of the steam fuel outlet 3-3 is 2-6 mm, so that fuel steam can be rapidly sprayed out and fully mixed with air, the phenomenon that the mixing of the fuel steam and the air is affected due to the fact that the flow speed of the fuel steam sprayed out of the steam fuel outlet 3-3 is not enough is avoided, the diameter of the steam fuel outlet is too small, the fuel steam stays in the fuel evaporation sleeve for too long time and absorbs too much heat, and fuel pyrolysis is caused; the distance between the end part of the inner pipe 3-2 and the end part of the outer pipe 3-1 is 10-20 mm, so that fuel can be better sprayed out from the inner pipe 3-2 to the inner surface of the end part of the outer pipe 3-1, the phenomenon that the distance is too large, the fuel cannot be sprayed out to the inner surface of the end part of the outer pipe 3-1, and the spraying of the fuel from the inner pipe 3-2 is influenced due to too small distance; an outer pipe 3-1 of the fuel evaporation sleeve 3 is welded with a combustion chamber cover 6, and the fuel evaporation sleeve 3 is made of high-temperature-resistant stainless steel.
The air inlets 11 on the side wall of the first-stage combustion chamber 10 are distributed circumferentially, the number of the air inlets 11 is gradually reduced from the end part to the tail part of the first-stage combustion chamber 10, the number of the first row of air inlets 11 is 11-15, and the number ratio of the two adjacent rows of air inlets 11 is 1: 0.7-0.8; the first row of air inlet holes 11 on the side wall of the primary combustion chamber 10 are obliquely arranged, the air inlet angle of the air inlet holes 11 and the side wall of the primary combustion chamber 10 form an included angle of 30-45 degrees, so that air is blown to the central area of the oil absorption porous medium 4, the evaporation of fuel oil is accelerated, the phenomenon that the air is blown to the boundary of the oil absorption porous medium 4 due to too large or too small angle is prevented, and the effect on the evaporation of the fuel oil is not large; the other air inlets 11 are normally arranged, the diameter of each air inlet 11 is 1.5-3 mm, and the total area of the air inlets 11 accounts for 0.1-1% of the surface area of the side wall of the primary combustion chamber 10.
In the invention, one part of air supplied into the air channel enters the primary combustion chamber through the air inlet hole to be mixed with fuel steam, and the other part of air directly enters the first porous medium to provide air for the secondary combustion of the mixed gas; meanwhile, the tail part of the primary combustion chamber and the tail part of the air inlet guide cylinder are arranged to be conical, air blown into the first porous medium enables combustion flame to directly scour the rear end of the fuel evaporation sleeve, and the fuel is fully evaporated at the rear end of the fuel evaporation sleeve.
A second ribbed plate 17 is arranged at the rear end of the primary combustion chamber 10, a first ribbed plate 16 is arranged at the rear end of the air inlet guide cylinder 9, and a second porous medium 15 is also arranged between the first ribbed plate 16 and the second ribbed plate 17; the porosity of the second porous medium 15 is 0.5 to 0.8, and the porosity of the first porous medium 13 is 0.8 to 0.95. The aperture of the second porous medium 15 is 0.12-0.24 mm, and the aperture of the first porous medium 13 is 0.18-0.3 mm. The first porous medium 13 and the second porous medium 15 are stainless steel or copper in a porous foam shape or a porous fiber felt shape; when the first porous medium 13 and the second porous medium 15 are in the form of porous foam, the average pore diameter is 0.18-0.42 mm, and when the first porous medium 13 and the second porous medium 15 are in the form of porous fiber felt, the average filament diameter is 25-40 μm.
The thickness of the first porous medium 13 is 50-80 mm, and the length of the fuel evaporation sleeve 3 inserted into the porous medium 13 is 30-60 mm. On one hand, the sleeve is heated to help fuel vaporization; on the other hand, fuel oil in the porous medium evaporator of the combustion chamber cover area is heated through radiation effect to be vaporized; and meanwhile, the fuel steam is further heated, so that the fuel steam is mixed with air, and the full combustion is facilitated.
In the invention, when ignition and low-power combustion are carried out, fuel can be evaporated by directly utilizing the oil absorption porous medium 4 without using the fuel evaporation sleeve 3, and when high-power combustion is carried out, in order to evaporate the fuel and better mix the fuel with air, the fuel evaporation sleeve 3 is used for evaporating the fuel without utilizing the oil absorption porous medium 4 after the fuel evaporation sleeve 3 reaches the temperature capable of evaporating the fuel.
The working process of the invention is as follows: the ignition mechanism 18 is electrified firstly, oil is supplied to the second oil pipe 21 when the ignition mechanism reaches the glowing state, the fuel oil in the second oil pipe 21 is supplied to the oil groove 5 through the second oil supply hole 20, and the fuel oil is absorbed by the oil absorption porous medium 4 and is uniformly diffused; the fuel oil near the ignition mechanism 18 is evaporated, meanwhile, a part of air is blown to the oil absorption porous medium 4 through the first exhaust hole 11 to accelerate the evaporation of the fuel oil, the evaporated fuel oil is mixed with the air, after the ignition mechanism 18 reaches the ignition temperature of the mixed gas, the mixed gas is ignited and is combusted in the primary combustion chamber 10, and the first porous medium 13 and the second porous medium 15 are heated after the combustion; the other part of air enters the primary combustion chamber 10 through the second porous medium 15 and the first porous medium 13 to provide secondary air for the combustion of the mixed gas, part of combustion steam is mixed with the secondary air and then is combusted in the first porous medium 13 to heat the first porous medium 13, the high-temperature first porous medium 13 heats the oil absorption porous medium 4 through radiation, so that the fuel oil in the oil absorption porous medium 4 is quickly evaporated and mixed with the air, meanwhile, the air blown into the first porous medium 13 enables the combustion flame to directly scour the rear end of the fuel oil evaporation sleeve 3, and when the ignition temperature can be maintained, the ignition mechanism is powered off; the mixed gas is burnt in the first porous medium 13 to heat the rear end of the fuel evaporation sleeve 3, when the fuel evaporation sleeve 3 reaches glowing, oil is supplied to the first oil pipe 1, the fuel in the first oil pipe 1 is supplied into the inner pipe 3-2 through the oil supply hole 12 and is sprayed into the outer pipe 3-1 from the top of the inner pipe 3-2, the fuel absorbs heat at the top of the outer pipe 3-1 to evaporate, and fuel steam is sprayed out from the steam fuel outlet 3-3 to be mixed with air in the primary combustion chamber 10.
At the burning of first porous medium 13 to the rear end of heating fuel evaporation sleeve 3, the air in the part entering first porous medium 13 provides the air for the burning secondary of gas mixture, blows in the air of first porous medium 13 simultaneously and makes burning flame directly erode the rear end of fuel evaporation sleeve 3, makes the abundant evaporation of fuel, thereby reaches better combustion effect.
Claims (10)
1. The liquid fuel porous medium combustor is characterized by comprising an air inlet guide cylinder (9), wherein the rear end of the air inlet guide cylinder (9) is connected with a secondary combustion chamber (14); a primary combustion chamber (10) is arranged in the air inlet guide cylinder (9), a combustion chamber cover (6) is arranged at the front end of the primary combustion chamber (10), an oil groove (5) is arranged on the inner wall of the combustion chamber cover (6), an ignition mechanism is arranged in the primary combustion chamber (10), and an oil absorption porous medium (4) is arranged on the inner surface of the combustion chamber cover (6); a fuel evaporation sleeve (3) is arranged on the central line in the primary combustion chamber (10), and the front end of the fuel evaporation sleeve (3) is connected with a combustion chamber cover (6); a second rib plate (17) is arranged at the rear end of the primary combustion chamber (10), a first rib plate (16) is arranged at the rear end of the air inlet guide cylinder (9), a second porous medium (15) is arranged between the first rib plate (16) and the second rib plate (17), and a first porous medium (13) is arranged between the outlet at the rear end of the primary combustion chamber (10) and the inlet of the secondary combustion chamber (14); the rear end of the fuel evaporation sleeve (3) extends into the first porous medium (13), and the rear end of the fuel evaporation sleeve (3) is closed; a gap between the air inlet guide cylinder (9) and the primary combustion chamber (10) forms an air channel, and a plurality of rows of air inlets (11) are circumferentially arranged on the side wall of the primary combustion chamber (10); the side wall of the fuel evaporation sleeve (3) is provided with a steam fuel outlet (3-3).
2. The porous medium burner of the liquid fuel according to claim 1, characterized in that an air inlet splitter plate (7) is arranged between the front end of the air inlet guide cylinder (9) and the primary combustion chamber (10), and a plurality of air inlet holes (8) are uniformly arranged on the air inlet splitter plate (7).
3. The porous medium burner for liquid fuel as claimed in claim 1, characterized in that the rear end of the primary combustion chamber (10) is provided with second ribs (17), and the rear end of the air intake guide cylinder (9) is provided with first ribs (16); the second porous medium (15) has a porosity of 0.5 to 0.8, and the first porous medium (13) has a porosity of 0.8 to 0.95.
4. The porous medium burner for liquid fuel according to claim 1, wherein the combustion chamber cover (6) is provided with a first oil supply hole (2) and a second oil supply hole (20), the fuel evaporation sleeve (3) is internally provided with a first oil pipe (1), the first oil pipe (1) passes through the first oil supply hole (2) and extends out of the combustion chamber cover (6), and the second oil supply hole (20) is communicated with the oil groove (5).
5. The porous medium burner for liquid fuel as claimed in claim 1, wherein the porosity of the oil absorbing porous medium (4) is 0.6 to 0.85, the oil absorbing porous medium (4) is porous foam or porous fiber felt stainless steel, the average pore diameter of the oil absorbing porous medium is 0.18 to 0.42mm when the oil absorbing porous medium is porous foam stainless steel, and the average filament diameter of the oil absorbing porous medium is 25 to 40 μm when the oil absorbing porous medium is porous fiber felt stainless steel.
6. The porous medium burner for liquid fuel according to claim 1, wherein the fuel evaporation sleeve (3) comprises an outer tube (3-1) and an inner tube (3-2), the inner tube (3-2) is sleeved in the outer tube (3-1), and a plurality of steam fuel outlets (3-3) are uniformly arranged on the outer tube (3-1) in the circumferential direction.
7. The porous medium burner for liquid fuel according to claim 6, wherein the diameter of the outer tube (3-1) is 20-30 mm, the diameter of the inner tube (3-2) is 10-16 mm, the diameter of the steam fuel outlet (3-3) is 2-6 mm, and the distance between the end of the inner tube (3-2) and the end of the outer tube (3-1) is 10-20 mm.
8. The porous medium burner for the liquid fuel as claimed in claim 1, wherein a plurality of rows of air inlets (11) are circumferentially distributed along the side wall of the primary combustion chamber (10), the number of the air inlets (11) in each row is gradually reduced from the end part to the tail part of the primary combustion chamber (10), the number of the air inlets (11) in the first row is 11-15, and the number ratio of the air inlets (11) in the two adjacent rows is 1: 0.7-0.8; the first exhaust air inlet holes (11) are obliquely arranged, and the air inlet angle of the first exhaust air inlet holes (11) and the side wall of the primary combustion chamber (10) form an included angle of 30-45 degrees; the diameter of each air inlet (11) is 1.5-3 mm, and the total area of the air inlets (11) accounts for 0.1-1% of the surface area of the side wall of the primary combustion chamber (10).
9. A liquid fuel porous media burner as in claim 3, wherein: the first rib plate (16) is parallel to the second rib plate (17), and the angle between the first rib plate (16) and the side wall of the primary combustion chamber (10) is 100-130 degrees; the thickness of the first porous medium (13) is 50-80 mm, and the length of the first porous medium (13) inserted into the rear end of the fuel evaporation sleeve (3) is 30-60 mm; the first porous medium (13) and the second porous medium (15) are stainless steel or copper in a porous foam shape or a porous fiber felt shape; when the first porous medium (13) and the second porous medium (15) are in the form of porous foams, the average pore diameter of the foams is 0.18-0.42 mm, and when the first porous medium (13) and the second porous medium (15) are in the form of porous fiber felts, the average filament diameter of the fibers is 25-40 μm.
10. A use method of the liquid fuel porous medium evaporative burner based on claim 6 is characterized in that the ignition mechanism (18) is firstly electrified to supply oil to the second oil pipe (21) when reaching burning, the oil in the second oil pipe (21) is supplied to the oil groove (5) through the second oil supply hole (20), and the oil is absorbed by the oil absorption porous medium (4) and is uniformly diffused; fuel oil close to the ignition mechanism (18) is evaporated, meanwhile, a part of air is blown to the oil absorption porous medium (4) through the first exhaust hole (11) to accelerate the evaporation of the fuel oil, the evaporated fuel oil is mixed with the air, when the ignition mechanism (18) reaches the ignition temperature of the mixed gas, the mixed gas is ignited and is combusted in the primary combustion chamber (10), and the first porous medium (13) and the second porous medium (15) are heated after the combustion; the other part of air enters the primary combustion chamber (10) through the second porous medium (15) and the first porous medium (13) to provide secondary air for the combustion of the mixed gas, part of combustion steam is mixed with the secondary air and then is combusted in the first porous medium (13) to heat the first porous medium (13), the high-temperature first porous medium (13) heats the oil-absorbing porous medium (4) through radiation, so that fuel oil in the oil-absorbing porous medium (4) is quickly evaporated and mixed with the air, meanwhile, the air blown into the first porous medium (13) enables combustion flame to directly scour the rear end of the fuel oil evaporation sleeve (3), and when the ignition temperature can be maintained, the ignition mechanism is powered off; the mixed gas is combusted in the first porous medium (13) to heat the rear end of the fuel evaporation sleeve (3), when the fuel evaporation sleeve (3) reaches glowing, oil is supplied to the first oil pipe (1), the fuel in the first oil pipe (1) is supplied into the inner pipe (3-2) through the first oil supply hole (2) and is sprayed into the outer pipe (3-1) from the top of the inner pipe (3-2), the fuel absorbs heat at the top of the outer pipe (3-1) to evaporate, and fuel steam is sprayed out from the steam fuel outlet (3-3) to be mixed with air in the primary combustion chamber (10).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102004049903B4 (en) * | 2004-10-13 | 2008-04-17 | Enerday Gmbh | Burner device with a porous body |
| CN101556040A (en) * | 2009-05-15 | 2009-10-14 | 大连理工大学 | Porous medium combustion apparatus of combustion use liquid fuel |
| CN101832554B (en) * | 2010-05-18 | 2011-10-05 | 杭州电子科技大学 | Liquid fuel porous medium combusting device and combusting method thereof |
| DE102011006192B4 (en) * | 2011-03-28 | 2014-03-27 | Eberspächer Climate Control Systems GmbH & Co. KG | Evaporator assembly, in particular for a fuel-powered vehicle heater or a reformer |
| CN102563639B (en) * | 2011-12-30 | 2014-01-29 | 西安交通大学 | Porous medium and heat pipe combustor for liquid fuel |
| DE102013200016A1 (en) * | 2013-01-02 | 2014-07-03 | Eberspächer Climate Control Systems GmbH & Co. KG | Catalytic burner, in particular for vehicle heating |
| DE102013220654B4 (en) * | 2013-10-14 | 2023-10-19 | Eberspächer Climate Control Systems GmbH | Combustion chamber assembly for an evaporator burner |
| DE102014117115A1 (en) * | 2014-11-23 | 2016-05-25 | Webasto SE | evaporator assembly |
| JP6477085B2 (en) * | 2015-03-19 | 2019-03-06 | アイシン精機株式会社 | Fuel cell system |
| CN109237470B (en) * | 2018-08-20 | 2024-02-06 | 华南理工大学 | Cylindrical porous jet type miniature liquid burner and combustion method thereof |
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