CN117722676A - Fuel premixing and pre-evaporating porous pipe sheared by three-stage air inlet rotational flow - Google Patents
Fuel premixing and pre-evaporating porous pipe sheared by three-stage air inlet rotational flow Download PDFInfo
- Publication number
- CN117722676A CN117722676A CN202311591518.2A CN202311591518A CN117722676A CN 117722676 A CN117722676 A CN 117722676A CN 202311591518 A CN202311591518 A CN 202311591518A CN 117722676 A CN117722676 A CN 117722676A
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- Prior art keywords
- fuel
- stage
- air inlet
- mixing section
- inclined holes
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- 239000000446 fuel Substances 0.000 title claims abstract description 82
- 238000001704 evaporation Methods 0.000 title claims abstract description 23
- 238000002156 mixing Methods 0.000 claims abstract description 44
- 238000010008 shearing Methods 0.000 claims abstract description 6
- 230000008020 evaporation Effects 0.000 claims description 12
- 238000009834 vaporization Methods 0.000 claims description 7
- 230000008016 vaporization Effects 0.000 claims description 7
- 239000003921 oil Substances 0.000 abstract description 14
- 238000002485 combustion reaction Methods 0.000 abstract description 11
- 239000000295 fuel oil Substances 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 description 7
- 238000000889 atomisation Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 230000035515 penetration Effects 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007084 catalytic combustion reaction Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Landscapes
- Nozzles For Spraying Of Liquid Fuel (AREA)
Abstract
The invention discloses a fuel premixing and pre-evaporating porous pipe with three-stage air inlet rotational flow shearing, which belongs to the technical field of pre-evaporating combustion and comprises a fuel rod and a porous pipe which are detachably connected, wherein a fuel nozzle is arranged in a connecting section between the fuel rod and the porous pipe; one end of the porous pipe, which is close to the oil nozzle, is provided with a first-stage mixing section, a second-stage mixing section and a third-stage mixing section which are sequentially connected, a plurality of first air inlet inclined holes with the same rotation direction are formed in the pipe wall of the first-stage mixing section, a plurality of second air inlet inclined holes opposite to the first air inlet inclined holes in rotation direction are formed in the pipe wall of the second-stage mixing section, and a plurality of straight holes are formed in the third-stage mixing section. According to the invention, a hole arrangement mode of two-stage anti-rotation inclined holes and one-stage straight holes with large diameters is adopted, so that the mixing effect of fuel oil and air is improved; a more uniform mixture of oil and gas can be obtained at the outlet of the perforated pipe and the processing cost and processing time are reduced.
Description
Technical Field
The invention belongs to the technical field of pre-evaporation combustion, and particularly relates to a fuel premixing and pre-evaporation perforated pipe with three-stage air inlet cyclone shearing.
Background
With the research of low pollution combustion technology at home and abroad, various technical schemes including staged combustion technology, pre-evaporation premixed combustion technology, catalytic combustion technology, variable geometry combustion chamber and the like are gradually developed. Currently, the best technology for reducing the stability of polluting emissions is the pre-evaporation premixed combustion technology. The pre-mixing and pre-evaporating combustion technology is to use a fuel evaporating device before the fuel enters a combustion chamber, so that the fuel is pre-evaporated in the device and pre-mixed with air to form an oil-gas mixture in a lean state, and then the mixture enters the combustion chamber for combustion.
In the prior art, for example, chinese patent: fuel pre-evaporation premixing perforated pipe, application number: CN200610112528.3, which adopts a porous pipe form to evaporate and mix the fuel, consists of two parts of fuel nozzle and evaporation mixing porous pipe. Fuel is ejected from the fuel nozzle into the perforated tube. The air in the porous pipe can be divided into fuel secondary atomization air, mixing air and rotational flow air according to functions. Six rows of straight holes or inclined holes with different pore diameters and pore distances are formed in the porous pipe, the first row is large-diameter straight hole air inlet of the nozzle section, secondary atomization is assisted by the nozzle, the second row is large-diameter straight hole air inlet of the blending section, fuel oil and air are blended, the third part is a plurality of rows of inclined hole rotational flow air with small pore diameters, the rotational flow air is used for generating rotational flow, the rotational flow air is further mixed with the air, and a backflow area is generated at the outlet of the porous pipe.
The prior fuel pre-evaporation premixing perforated pipe has the following problems:
1. the effect of the straight hole air inlet of the nozzle section on secondary atomization of fuel oil and oil-gas mixing is weaker;
2. the effect of straight hole air inlet of the mixing section on oil gas mixing is weaker;
3. the rear row of holes of the mixing section has more rows, smaller hole diameter and small penetration depth, and the mixing time of the oil gas participated in the rear row of holes is short, so that the mixing of the outlet oil gas is not uniform,
4. an excessive number of holes causes an increase in processing cost.
Disclosure of Invention
In order to solve the problems, the invention adopts the following technical scheme:
the fuel premixing and pre-evaporating porous pipe with three-stage air inlet rotational flow shearing comprises a fuel rod and a porous pipe which are detachably connected, wherein a fuel nozzle is arranged in a connecting section between the fuel rod and the porous pipe; the multi-hole pipe is close to one end of the oil nozzle and is provided with a first-stage mixing section, a second-stage mixing section and a third-stage mixing section which are sequentially connected, a plurality of first air inlet inclined holes with the same rotation direction are formed in the pipe wall of the first-stage mixing section, a plurality of second air inlet inclined holes opposite to the first air inlet inclined holes in rotation direction are formed in the pipe wall of the second-stage mixing section, and a plurality of straight holes are formed in the third-stage mixing section.
Further, the inner wall of the connecting section between the primary mixing section and the secondary mixing section is arranged in a contracted shape so as to form a contracted channel.
Further, the diameter of the constriction channel is 16 mm-20 mm.
Further, the oil nozzle is a centrifugal nozzle, and an outlet of the centrifugal nozzle is positioned at the primary mixing section.
Further, the first end of the fuel rod is connected with an external fuel supply device, the outer surface of the second end of the fuel rod is provided with a fuel rod external thread, and the inner surface of the second end of the fuel rod is provided with a fuel rod internal thread; the first end of the perforated pipe is provided with a perforated pipe internal thread which is in threaded connection with the external thread of the fuel rod; and the external thread of the oil nozzle is in threaded connection with the internal thread of the fuel rod.
Further, a gasket is disposed between the fuel rod and the perforated tube.
Further, the first air inlet inclined holes are arranged in a row, the number of the first air inlet inclined holes is 8-12, the diameter of each first air inlet inclined hole is 3.5-4.5 mm, and the inclined hole angle is 45 degrees.
Further, the second air inlet inclined holes are arranged in a row, the number of the second air inlet inclined holes is 6-8, the diameter of the second air inlet inclined holes is 5-6 mm, the inclined hole angle is 45 degrees, and the rotation direction of the second air inlet inclined holes is opposite to that of the first air inlet inclined holes.
Further, the number of the straight holes is 6-8, and the diameter of the straight holes is 5-6 mm.
The invention has the beneficial effects that:
compared with the prior art, the invention adopts a hole arrangement mode of two-stage anti-rotation inclined holes and one-stage straight holes with large diameter, thereby improving the mixing effect of fuel oil and air; a more uniform mixture of oil and gas can be obtained at the outlet of the perforated pipe and the processing cost and processing time are reduced.
Drawings
FIG. 1 is a schematic structural view of a three-stage inlet fuel pre-vaporization premixing perforated tube;
fig. 2 is a schematic structural view of an oil supply portion;
FIG. 3 is a schematic structural view of a perforated tube;
FIG. 4 is a schematic cross-sectional position of a porous tube bore;
FIG. 5 is a cross-sectional view A-A of FIG. 4;
FIG. 6 is a cross-sectional view B-B of FIG. 4;
FIG. 7 is a cross-sectional view of C-C of FIG. 4;
FIG. 8 is a schematic air flow diagram of a perforated tube;
in the figure: 1. an oil supply part; 2. centrifuging the nozzle; 3. a gasket; 4. a perforated tube; 5. a fuel rod; 6. a fuel rod locating surface; 7. external threads of the fuel rod; 8. internal threads of the fuel rod; 9. internal threads of the perforated pipe; 10. a first air inlet inclined hole; 11. a constriction channel; 12. a second air inlet inclined hole; 13. and (5) a straight hole.
Detailed Description
The invention provides a fuel premixing and pre-evaporating porous pipe sheared by three-stage air inlet rotational flow. The following detailed description of the present invention is provided in connection with the accompanying drawings, so as to facilitate understanding and grasping thereof.
Example 1
Referring to fig. 1-8, a fuel premixing and pre-evaporating porous pipe with three-stage air inlet rotational flow shearing comprises a fuel rod 5 and a porous pipe 4 which are detachably connected, wherein a fuel nozzle is arranged in a connecting section between the fuel rod 5 and the porous pipe 4; the porous pipe 4 is close to the one end of fuel sprayer and has the first order mixed section, second grade mixed section and the tertiary mixed section that connect gradually to set up, is provided with a plurality of first inlet chute 10 of same direction of rotation on the pipe wall of first mixed section, is provided with a plurality of second inlet chute 12 opposite to the direction of rotation of first inlet chute 10 on the pipe wall of second grade mixed section, and the tertiary mixed section is provided with a plurality of straight holes 13.
In this embodiment, the inner wall of the connecting section between the primary mixing section and the secondary mixing section is arranged in a contracted shape to form a contracted passage 11.
In this embodiment, the oil nozzle is a centrifugal nozzle 2, and the outlet of the centrifugal nozzle 2 is located in the first-stage mixing section.
Specifically, the fuel rod 5 is an oil supply part 1, and a fuel rod positioning surface 6 is arranged on the fuel rod 5; the first end of the fuel rod 5 is connected with an external fuel supply device, the outer surface of the second end of the fuel rod 5 is provided with a fuel rod external thread 7, and the inner surface is provided with a fuel rod internal thread 8; the first end of the perforated pipe 4 is provided with a perforated pipe internal thread 9, and the perforated pipe internal thread 9 is in threaded connection with the external thread 7 of the fuel rod; the external thread of the oil nozzle is in threaded connection with the internal thread 8 of the fuel rod.
In the embodiment, a gasket 3 is arranged between the fuel rod 5 and the perforated pipe 4, and the gasket 3 plays a role in sealing.
Specifically, the gasket 3 is a red copper gasket.
In this embodiment, the first air inlet inclined holes 10 are arranged in a row, the number of the first air inlet inclined holes is 8-12, the first air inlet inclined holes 10 are uniformly arranged along the circumferential direction, the diameter of the first air inlet inclined holes 10 is 3.5-4.5 mm, and the inclined hole angle is 45 degrees; the second air inlet inclined holes 12 are arranged in a row, the number of the second air inlet inclined holes 12 is 6-8, the second air inlet inclined holes 12 are uniformly distributed along the circumferential direction, the diameter of the second air inlet inclined holes 12 is 5-6 mm, the inclined hole angle is 45 degrees, and the rotation direction of the second air inlet inclined holes 12 is opposite to that of the first air inlet inclined holes 10; the number of the straight holes 13 is 6-8, the straight holes 13 are uniformly distributed along the circumferential direction, and the diameter of the straight holes 13 is 5-6 mm; wherein the diameter of the constriction channel 11 is 16 mm-20 mm.
The fuel flow process is as follows, as shown in fig. 2, the fuel rod 5 is connected with an external fuel supply device, and the fuel enters the centrifugal nozzle 2 through the fuel rod 5, and the centrifugal nozzle 2 performs initial atomization and secondary atomization on the fuel.
The air flow process is shown in fig. 8, the first-stage air inlet inclined holes (8-12 first air inlet inclined holes 10 in the first row) bring the first-stage mixed air with rotational flow, and the secondary atomization and evaporation of auxiliary fuel oil and the mixing effect of the fuel oil and the air in the first stage are achieved. The first portion of air passes through the converging channel 11 forming a stream of swirling air within the porous tube.
The second-stage anti-rotation air inlet inclined holes (6-8 second air inlet inclined holes 12 positioned in the second row) bring second part of rotational flow mixed air, and air flow opposite to the first part of rotational flow air is formed outside the porous pipe, so that the two anti-rotation air has strong shearing action to help improve the evaporation and mixing efficiency of fuel and air.
The third level of straight intake holes (6-8 third straight intake holes 13 in the third row) brings about a third portion of blended air, and the large diameter straight hole airflow has a higher momentum ratio and thus a higher jet penetration depth, which can bring the airflow to the center portion of the perforated pipe for more efficient vaporization and blending with the fuel in the center portion.
Under the action of three air with different functions, a more uniform mixture of fuel steam and air for complete evaporation and oil-gas mixing is formed at the outlet of the porous tube.
Wherein, the air inlet of the first-stage air inlet inclined hole accounts for 25% -35% of the total air flow, the air inlet of the second-stage anti-rotation inclined hole accounts for 30% -40% of the total air flow, and the rest is the air inlet of the third-stage air inlet straight hole.
While the foregoing has been described in terms of embodiments of the present invention, it will be appreciated that the embodiments of the invention are not limited by the foregoing description, but rather, all embodiments of the invention may be modified in structure, method or function by one skilled in the art to incorporate the teachings of this invention, as expressed in terms of equivalent or equivalent embodiments, without departing from the scope of the invention.
Claims (9)
1. The fuel premixing and pre-evaporating porous pipe with three-stage air inlet rotational flow shearing is characterized by comprising a fuel rod and a porous pipe which are detachably connected, wherein a fuel nozzle is arranged in a connecting section between the fuel rod and the porous pipe; the multi-hole pipe is close to one end of the oil nozzle and is provided with a first-stage mixing section, a second-stage mixing section and a third-stage mixing section which are sequentially connected, a plurality of first air inlet inclined holes with the same rotation direction are formed in the pipe wall of the first-stage mixing section, a plurality of second air inlet inclined holes opposite to the first air inlet inclined holes in rotation direction are formed in the pipe wall of the second-stage mixing section, and a plurality of straight holes are formed in the third-stage mixing section.
2. The three stage inlet swirl sheared fuel premix pre-vaporization perforated tube of claim 1 wherein the inner wall of the connecting section between the primary mixing section and the secondary mixing section is arranged in a convergent configuration to form a convergent channel.
3. The three stage inlet swirl sheared fuel premix pre-vaporization perforated tube of claim 2 wherein the diameter of the constriction channel is 16mm to 20mm.
4. The three stage inlet swirl sheared fuel premix pre-vaporization perforated tube of claim 1 wherein the fuel injector is a centrifugal nozzle with the outlet of the centrifugal nozzle located in the primary mixing section.
5. The three-stage inlet swirl sheared fuel pre-mixing and pre-evaporating perforated pipe according to claim 1, wherein a first end of the fuel rod is connected with an external oil supply device, an external thread of the fuel rod is arranged on the outer surface of a second end of the fuel rod, and an internal thread of the fuel rod is arranged on the inner surface of the fuel rod; the first end of the perforated pipe is provided with a perforated pipe internal thread which is in threaded connection with the external thread of the fuel rod; and the external thread of the oil nozzle is in threaded connection with the internal thread of the fuel rod.
6. The three stage inlet swirl sheared fuel premix pre-vaporization perforated tube of claim 1 wherein a gasket is disposed between the fuel rail and the perforated tube.
7. The three stage inlet swirl sheared fuel premix pre-evaporation perforated tube of claim 1, wherein the first inlet inclined holes are in a row, the number of the first inlet inclined holes is 8-12, the diameter of the first inlet inclined holes is 3.5-4.5 mm, and the inclined hole angle is 45 °.
8. The three-stage inlet swirl sheared fuel premix pre-evaporation perforated pipe according to claim 1, wherein the second inlet inclined holes are arranged in a row and have 6-8 numbers, the diameter of the second inlet inclined holes is 5-6 mm, the inclined holes are 45 degrees, and the rotation direction of the second inlet inclined holes is opposite to that of the first inlet inclined holes.
9. The three stage inlet swirl sheared fuel premix pre-vaporization perforated tube of claim 1 wherein the number of straight holes is 6-8 and the diameter of the straight holes is 5-6 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311591518.2A CN117722676A (en) | 2023-11-27 | 2023-11-27 | Fuel premixing and pre-evaporating porous pipe sheared by three-stage air inlet rotational flow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311591518.2A CN117722676A (en) | 2023-11-27 | 2023-11-27 | Fuel premixing and pre-evaporating porous pipe sheared by three-stage air inlet rotational flow |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117722676A true CN117722676A (en) | 2024-03-19 |
Family
ID=90202511
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311591518.2A Pending CN117722676A (en) | 2023-11-27 | 2023-11-27 | Fuel premixing and pre-evaporating porous pipe sheared by three-stage air inlet rotational flow |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117722676A (en) |
-
2023
- 2023-11-27 CN CN202311591518.2A patent/CN117722676A/en active Pending
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