CN111237753A - Oil supply combustion system of multistage cyclone parking heater - Google Patents
Oil supply combustion system of multistage cyclone parking heater Download PDFInfo
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- CN111237753A CN111237753A CN202010131674.0A CN202010131674A CN111237753A CN 111237753 A CN111237753 A CN 111237753A CN 202010131674 A CN202010131674 A CN 202010131674A CN 111237753 A CN111237753 A CN 111237753A
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 97
- 239000000446 fuel Substances 0.000 claims abstract description 98
- 238000009423 ventilation Methods 0.000 claims abstract description 50
- 238000005192 partition Methods 0.000 claims abstract description 28
- 238000000889 atomisation Methods 0.000 claims abstract description 27
- 238000007667 floating Methods 0.000 claims abstract description 26
- 230000007246 mechanism Effects 0.000 claims abstract description 11
- 230000004323 axial length Effects 0.000 claims description 7
- 238000009826 distribution Methods 0.000 claims description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 abstract description 28
- 239000003921 oil Substances 0.000 description 196
- 238000010438 heat treatment Methods 0.000 description 7
- 239000007788 liquid Substances 0.000 description 6
- 125000003158 alcohol group Chemical group 0.000 description 4
- 239000000295 fuel oil Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000009834 vaporization Methods 0.000 description 2
- 230000008016 vaporization Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000003225 biodiesel Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000003502 gasoline Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
- B60H1/2203—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from burners
-
- 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
-
- 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
- F23D11/38—Nozzles; Cleaning devices therefor
- F23D11/383—Nozzles; Cleaning devices therefor with swirl means
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Pressure-Spray And Ultrasonic-Wave- Spray Burners (AREA)
Abstract
A multi-stage rotational flow parking heater oil supply combustion system belongs to the technical field of parking heater combustion. The invention solves the problems that the alcohol-based fuel in the existing parking heater is difficult to cold start, the combustion efficiency is low, the adjustable range of the oil supply of a single-oil-way oil supply combustion system is small, and the stable performance under low load and high load is difficult to ensure. The oil supply device comprises an oil supply mechanism and a combustor, wherein the combustor comprises an ignition plug, an atomization net, a reference piece, a main oil way partition plate, a ventilation piece and a combustor shell which are coaxially arranged, the ignition plug is a variable-diameter cylindrical section, the reference piece is sleeved on the ignition plug, an annular cavity is formed between the middle part of the reference piece and the ignition plug, and a plurality of axial guide vanes are machined on the outer surface of the reference piece. The double-oil-way oil supply mode automatically adjusted by the floating ball oil separator is adopted, so that the alcohol-based fuel can effectively absorb heat to evaporate and be ignited in the atomizing net, and an ignition heat source of the main oil-way fuel is provided, so that the problem of difficult cold start of the alcohol-based fuel is effectively solved.
Description
Technical Field
The invention relates to an oil supply combustion system of a multistage rotational flow parking heater, and belongs to the technical field of parking heater combustion.
Background
In northern China, due to low temperature and long time in winter, great inconvenience is brought to normal use of vehicles, and great influence is brought to aspects such as cold start of vehicles, heating of diesel vehicles and large-sized vehicles, heating of electric automobiles and mileage continuation. If the automobile engine is not preheated and is subjected to hard start, not only can the starting difficulty be caused, but also the service life of automobile parts can be influenced in serious cases; the heat demand for heating diesel vehicles and large vehicles is large, and the economy of heating by using the vehicles is poor; the direct power utilization and heating of the electric automobile can seriously affect the endurance mileage and reduce the reliability and the economical efficiency of the electric automobile. The use of parking heaters, particularly clean fuels such as alcohol-based fuels, will largely solve the above problems. The parking heater is used as an independent combustion type liquid circulation heating device, can well transfer heat to any position of a carriage, and has the effects of effectively solving the problem of difficult starting in a low-temperature environment, reducing harmful gas emission during cold starting of an automobile, heating, defrosting, prolonging the service life of a battery and an engine, saving energy and the like. Alcohol-based fuels are highly efficient, clean, economical and widely available. Alcohol-based fuels have many advantages over conventional fuels, such as low viscosity for easy atomization, high ignition point for improved safety, low emissions for reduced environmental pollution, etc., and tests and studies have shown that alcohol-based fuels are fully feasible for use in automotive parking heaters, but present new challenges.
The combustion system is the core of the parking heater, and the combustion quality is directly related to the overall performance and emission standard of the parking heater. Therefore, in order to improve the combustion efficiency of the parking heater combustion chamber, a good combustion system structure is essential. The conventional parking heater adopts a mode of directly supplying oil from an oil pump to a single oil path, but the prior embodiment of the combustion system using the single oil path oil supply or alcohol-based fuel has the following problems:
1. the single oil path oil supply combustion system has small oil supply quantity change within a certain oil supply pressure range, and cannot meet the requirement that the oil supply quantity of a parking heater is continuously adjustable within a large range, so that the stable performance is difficult to ensure under low load and high load.
2. Because the latent heat of vaporization of the alcohol-based fuel is very large compared with the common fuel, the absorbed heat is much during vaporization, the temperature of a combustion area is low, and the combustion efficiency is poor. Therefore, alcohol-based fuels require better preheating.
3. The residence time of the fuel in the combustion chamber is short, and the fuel concentration at the front end of the fuel spray hole is high, so that a large amount of fuel is discharged out of the combustion chamber without reacting with air, the combustion efficiency is low, and the phenomena of exhaust, smoke and the like are generated in the combustion chamber.
4. When the fuel is burnt, the ignition heat of the liquid fuel is increased due to the one-time feeding of the air, so that the problems of incapability of ignition, oil dripping, carbon precipitation and the like are caused.
Therefore, there is a need for further improvement in various aspects of a parking heater combustion system, so that the parking heater can obtain good combustion efficiency under various working conditions while effectively using alcohol-based fuel or other liquid fuel, and the whole combustion chamber can meet the requirements of high-efficiency low-pollution combustion technology.
Disclosure of Invention
The invention aims to solve the problems that the cold start of alcohol-based fuel in the conventional parking heater is difficult, the combustion efficiency is low, the adjustable range of the oil supply amount of a single-oil-way oil supply combustion system is small, and the stable performance under low load and high load is difficult to ensure, and further provides an oil supply combustion system of a multistage rotational flow parking heater.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a multi-stage rotational flow parking heater oil supply combustion system comprises an oil supply mechanism and a combustor, wherein the combustor comprises an ignition plug, an atomization net, a reference part, a main oil way partition plate, a ventilation part and a combustor shell which are coaxially arranged, the ignition plug is a variable-diameter cylindrical section, the reference part is sleeved on the ignition plug, an annular cavity is formed between the middle part of the reference part and the ignition plug, and a plurality of axial guide vanes are processed on the outer surface of the reference part;
the atomization net is of a hollow cylindrical structure and is arranged in an annular cavity between the reference part and the ignition plug, an annular gap is formed between the inner surface of the atomization net and the ignition plug,
the main oil way partition plate is of a hollow cylindrical structure sleeved on the reference piece, trapezoidal threads are processed on the outer surface of the main oil way partition plate, a plurality of axial flow guide blades are positioned between the main oil way partition plate and the reference piece to form a root part air flow channel, one end part of the ventilation piece far away from the combustion chamber is coaxially sleeved on the main oil way partition plate, and a main oil way channel is formed between the ventilation piece and the main oil way partition plate through the trapezoidal threads,
one end part of the reference piece close to the combustion chamber is a tapered section, an auxiliary oil path convergence channel is formed between the tapered section and the ignition plug, one end of the auxiliary oil path convergence channel close to the combustion chamber is an auxiliary oil path fuel nozzle, a main oil path convergence channel is formed between the inner surface of the ventilation piece and the outer surface of the tapered section of the reference piece, one end of the main oil path convergence channel close to the combustion chamber is a main oil path fuel nozzle,
the outlet end of the main oil path channel is arranged close to the main oil path convergence channel, the inlet end of the main oil path is communicated and fixedly connected with a main oil path pipe section, an auxiliary oil path pipe section is tangentially inserted on the reference piece, the auxiliary oil path pipe section is arranged far away from the combustion chamber, the end part of the auxiliary oil path pipe section is communicated with an annular cavity where the atomizing net is arranged, the oil supply mechanism is communicated with the combustor through the main oil path pipe section and the auxiliary oil path pipe section respectively,
a plurality of primary swirl holes are circumferentially processed at the position, close to the reducing section, on the reference part, a plurality of secondary swirl holes and a plurality of tertiary swirl holes are processed at the middle part of the ventilation part, and a positioning ring is fixedly arranged on the outer surface of the ventilation piece between the secondary swirl holes and the tertiary swirl holes in the circumferential direction, the axial section of the positioning ring is L-shaped, a plurality of air inlets are formed in the positioning ring along the circumferential direction, one end part of the ventilation piece close to the combustion chamber is a straight section, a flame tube shell of the combustion chamber is sleeved on the straight section in a matching mode, a casing shell of the combustion chamber is sleeved on the positioning ring in a matching mode, an air inlet channel is formed between the flame tube shell and the casing shell, the primary swirl hole and the secondary swirl hole are communicated with the air inlet channel through a plurality of air inlets, the combustor shell is sleeved outside the ventilation piece, one end of the combustor shell is fixedly connected with a reference piece, and the other end.
The oil feeding mechanism comprises a buffer tank, an oil feeding pipe and a floating ball oil distributor, wherein the oil feeding pipe is fixedly communicated with the top of the buffer tank, the floating ball oil distributor comprises an oil distributing pipeline, a floating ball and an adjusting screw, the oil distributing pipeline is vertically arranged, the bottom end of the oil distributing pipeline is communicated with the lower portion of the buffer tank, the adjusting screw is coaxially arranged at the top of the oil distributing pipeline and is in threaded connection with the oil distributing pipeline, a throat is machined in the oil distributing pipeline below the adjusting screw, the floating ball is located in the oil distributing pipeline above the throat, a main oil way pipe section is fixedly communicated with the oil distributing pipeline above the throat, and an auxiliary oil way pipe section is fixedly communicated with the oil distributing pipeline below the throat.
Furthermore, one end part of the reference piece far away from the combustion chamber is in threaded connection with the ignition plug, one end part of the reference piece far away from the combustion chamber is in threaded connection with one end part of the burner shell, the other end part of the burner shell is in threaded connection with the positioning ring, and the outer surface of the atomization net is in close contact with the inner surface of the reference piece, and one end of the atomization net is in close contact with a shaft shoulder on the ignition plug.
Furthermore, the number of winding turns of the trapezoidal thread is 4-10, the thread pitch is 1-3 mm, the nominal diameter is 16-20 mm, the thread form angle is 10-45 degrees, and the rotational direction of the inner rotational flow of the trapezoidal thread is the same as the rotational direction of air entering the primary rotational flow hole.
Furthermore, the number of the axial guide vanes is 4-8, the axial guide vanes are uniformly distributed along the circumferential direction of the reference piece, and the axial length of each axial guide vane is smaller than or equal to 2/3 of the axial length of the partition plate main body.
Furthermore, the number of the primary swirl holes is 8-12, the primary swirl holes are uniformly distributed along the circumferential direction of the reference piece, the primary swirl holes are rectangular holes with the side length of 1-3 mm, and the projection of the included angle between the central axis of each primary swirl hole and the central axis of the reference piece on the section plane is 30-60 degrees; the number of the secondary vortex holes is 8-16, the secondary vortex holes are uniformly distributed along the circumferential direction of the ventilation piece, and the secondary vortex holes are round holes with the diameter of 1-3 mm; the quantity of tertiary whirl hole is 12 ~ 24, and along ventilation piece circumference equipartition, and tertiary whirl hole is 2 ~ 6mm rectangular hole of length of side, and the projection of contained angle on the section between the axis of every tertiary whirl hole and the ventilation piece axis is 30 ~ 60.
Furthermore, the central axes of the primary swirl hole, the secondary swirl hole and the tertiary swirl hole are arranged in the same direction.
Furthermore, the inner diameter and the outer diameter of the main oil path pipe section are both 1-3 mm, and the inner diameter and the outer diameter of the auxiliary oil path pipe section are both 0.5-1.5 mm.
Furthermore, the diameter distance between the inner ring and the outer ring of the fuel nozzle of the main oil way and the diameter distance between the inner ring and the outer ring of the fuel nozzle of the auxiliary oil way are both 0.25-1 mm.
Furthermore, the ventilation piece is coaxially sleeved with a supporting wheel, and the outer circular surface of the supporting wheel is in close contact with the positioning ring and the inner circular surface of the supporting wheel is in close contact with the ventilation piece.
Compared with the prior art, the invention has the following effects:
the system adopts a double-oil-way oil supply mode automatically regulated by a floating ball oil separator, adopts an ignition plug to preheat and ignite the fuel of the auxiliary oil way, so that the fuel effectively absorbs heat in an atomization net, evaporates and ignites, and provides an ignition heat source for the fuel of the main oil way, thereby effectively solving the problem of difficult cold start of the alcohol-based fuel;
the adjustable range of the fuel supply amount of the combustion system is large, and stable performance during low load and high load is effectively guaranteed.
The main oil way fuel passes through the trapezoidal threads on the main oil way partition plate, so that tangential oil feeding is realized by the main oil way fuel through multiple rotational flows, and meanwhile, a certain degree of preheating is obtained, ignition and combustion of the main oil way fuel are facilitated, and the combustion efficiency is effectively improved;
adopt multistage whirl hole structure will be divided into root wind and two-stage whirl wind by the whole air that inlet channel supplied with and strengthen the hierarchical mixture of alcohol group fuel and air for alcohol group fuel and air misce bene are favorable to the stability of combustion process, export temperature distribution is even and NOx discharges and reduce.
The application is applied to the parking heater combustion chamber burning alcohol-based fuel and other liquid fuels, and has the characteristics of high efficiency, stability and low pollution.
Drawings
FIG. 1 is a perspective view of the present application (burner housing not shown);
FIG. 2 is a schematic main sectional view of a burner of the present application;
FIG. 3 is an enlarged view at P of FIG. 2;
FIG. 4 is a schematic structural view of a main oil gallery partition;
FIG. 5 is a schematic view of a primary swirl hole configuration;
FIG. 6 is a schematic view of the vent;
FIG. 7 is a schematic structural view of the floating ball oil separator.
Detailed Description
The first embodiment is as follows: the embodiment is described with reference to fig. 1 to 7, and the oil supply combustion system of the multistage swirl parking heater comprises an oil supply mechanism 1 and a combustor, wherein the combustor comprises an ignition plug 2, an atomization net 3, a reference piece 4, a main oil path partition plate 5, a ventilation piece 6 and a combustor shell 7 which are coaxially arranged, the ignition plug 2 is a variable-diameter cylindrical section, the reference piece 4 is sleeved on the ignition plug 2, an annular cavity is formed between the middle part of the reference piece 4 and the ignition plug 2, and a plurality of axial guide vanes 8 are processed on the outer surface of the reference piece 4;
the atomization net 3 is a hollow cylindrical structure and is arranged in an annular cavity between the reference piece 4 and the ignition plug 2, an annular gap is formed between the inner surface of the atomization net 3 and the ignition plug 2,
the main oil way partition plate 5 is a hollow cylindrical structure sleeved on the reference piece 4, trapezoidal threads 5-1 are processed on the outer surface of the main oil way partition plate, a plurality of axial guide vanes 8 are positioned between the main oil way partition plate 5 and the reference piece 4 to form a root part air flow channel, one end part of the ventilation piece 6 far away from the combustion chamber is coaxially sleeved on the main oil way partition plate 5, a main oil way channel 9 is formed between the ventilation piece 6 and the main oil way partition plate 5 through the trapezoidal threads 5-1,
one end part of the reference piece 4 close to the combustion chamber is a tapered section, an auxiliary oil path convergence channel 10 is formed between the tapered section and the ignition plug 2, one end of the auxiliary oil path convergence channel 10 close to the combustion chamber is an auxiliary oil path fuel nozzle 11, a main oil path convergence channel 12 is formed between the inner surface of the ventilation piece 6 and the outer surface of the tapered section of the reference piece 4, one end of the main oil path convergence channel 12 close to the combustion chamber is a main oil path fuel nozzle 13,
the outlet end of the main oil path channel 9 is arranged close to the main oil path convergence channel 12, the inlet end of the main oil path is communicated and fixedly connected with a main oil path pipe section 14, an auxiliary oil path pipe section 15 is tangentially inserted into the reference part 4, the auxiliary oil path pipe section 15 is arranged far away from the combustion chamber, the end part of the auxiliary oil path pipe section 15 is communicated with the annular cavity where the atomizing net 3 is positioned, the oil supply mechanism 1 is communicated with the combustor through the main oil path pipe section 14 and the auxiliary oil path pipe section 15 respectively,
a plurality of primary swirl holes 16 are circumferentially processed at the position, close to the tapered section, on the reference part 4, a plurality of secondary swirl holes 17 and a plurality of tertiary swirl holes 18 are processed at the middle part of the ventilation part 6, a positioning ring 19 is circumferentially and fixedly arranged on the outer surface of the ventilation part 6 between the plurality of secondary swirl holes 17 and the plurality of tertiary swirl holes 18, the axial section of the positioning ring 19 is L-shaped, a plurality of vent holes 20 are circumferentially arranged on the positioning ring 19, one end part, close to the combustion chamber, on the ventilation part 6 is a straight section, a flame tube shell 21 of the combustion chamber is sleeved on the straight section in a matching way, a casing shell 22 of the combustion chamber is sleeved on the positioning ring 19 in a matching way, an air inlet channel 23 is formed between the flame tube shell 21 and the casing shell 22, the primary swirl holes 16 and the secondary swirl holes 17 are communicated with the air inlet channel 23 through the plurality of vent holes 20, the combustor shell 7 is sleeved, the other end of the burner housing 7 is fixedly connected with a positioning ring 19.
The retaining ring 19 and the ventilation element 6 can be formed integrally.
The primary oil duct section 14 is arranged in parallel with the secondary oil duct section 15.
The ignition plug 2 evaporates and atomizes the fuel of the auxiliary oil way in the atomizing net 3 and provides an ignition heat source for the atomized fuel; the tail end of the auxiliary oil way is directed to one side of the combustion chamber and is flush with the end surface of the fuel nozzle 11 of the auxiliary oil way or is exposed for a certain length;
the auxiliary oil path fuel nozzle 11 is located in an annular gap between the reference part 4 and the ignition plug 2, the front side of the auxiliary oil path fuel nozzle is an auxiliary oil path convergent channel 10, and the center of the auxiliary oil path fuel nozzle 11 is located on the axis of the combustor;
the auxiliary oil path convergence channel 10 is an annular cavity structure formed between the tapered section of the reference part 4 and the ignition plug 2;
the main oil path convergence channel 12 is a tapered annular cavity structure formed by a tapered section of the reference piece 4 and the inner wall surface of the ventilation piece 6;
the atomization net 3 is a hollow cylindrical metal wire net or a sintered hollow cylindrical structure, and the tail end position of the atomization net cannot exceed the center line of the primary swirl hole 16 on the reference piece 4.
An annular cavity is formed between the reference part 4 and the ignition plug 2 and is used as an installation space of the auxiliary oil circuit fuel atomization net 3 and a space for evaporation atomization and ignition combustion;
air is fed along the ventilation holes 20 into the cavity formed by the ventilation member 6 and the burner housing 7, and further into the primary swirl holes 16 and the secondary swirl holes 17.
The primary swirl holes 16 are inlets for primary air, i.e., root wind inlets, with a certain eccentricity. The primary rotational flow holes 16 are arranged on the reference piece 4 and are uniformly distributed along the circumferential direction of the reference piece 4; the first-stage air tangentially enters the auxiliary oil passage through the first-stage swirl holes 16, and atomization and ignition of the alcohol-based fuel are enhanced under the action of tangential shearing force of the air.
The feeding of the secondary cyclone air and the tertiary cyclone air at different positions or different time points can be realized by controlling different included angles between the central lines of the secondary cyclone holes 17 and the tertiary cyclone holes 18 and the axis of the burner, so that the accurately controlled staged combustion is realized. The secondary swirl holes 17 and the tertiary swirl holes 18 may be selected from only one or two stages, and the opening pattern may be circular holes, rectangular holes or other types of rotating blades with the same flow area.
The positions of the imaginary axial centers of the secondary swirler holes 17 and the tertiary swirler holes 18 on the axis may be modified at the time of design to achieve precise control of the staged combustion.
The secondary swirl holes 17 are arranged close to the main oil passage partition 5, and the tertiary swirl holes 18 are arranged close to the combustion chamber.
A root wind flowing channel is formed between the main oil way partition plate 5 and the reference part 4, so that the first-stage air entering the channel can rotate along a tangential inlet to enter an annular cavity where the ignition plug 2 is located; fuel oil which is communicated with a main oil way at the interval of 5-1 trapezoidal threads flows through a main oil way convergence channel 12 after rotating along the circumferential direction and passing through a main oil way channel 9 which is formed by the main oil way partition plate 5 and the ventilation piece 6, and is sprayed into a combustion chamber from a main oil way fuel nozzle 13;
the trapezoidal thread 5-1 may be replaced with a rectangular thread or an external thread having another cross-sectional type or the like which performs the same function as the trapezoidal thread 5-1.
The main oil path fuel nozzle 13 is positioned at the tail end of the reference part 4 and is flush with the auxiliary oil path fuel nozzle 11,
the auxiliary oil path pipe section 15 is inserted along the tangential direction of the inner circle of the auxiliary oil path channel at the position close to the front end of the ignition plug 2 and directly abuts against the atomization net 3, and during installation, an opening is formed in the reference part 4 and then welding is carried out;
the ventilation element 6, the positioning ring 19, the casing shell 22 and the flame tube shell 21 together form an air inlet mechanism. The secondary swirl holes 17, the tertiary swirl holes 18 and the vent holes 20 are used as inlet channels of all air to realize the staged swirl combustion of fuel oil; the machining precision of the outer surface of the straight section of the ventilation member 6 and the machining precision of the outer surface of the positioning ring 19 can ensure the sealing and fixing when the circular inlets of the casing shell 22 and the flame tube shell 21 are installed.
The middle part of the ventilation piece 6 is a divergent section.
The application can be used for liquid fuels with higher ignition heat such as alcohol-based fuels and the like, and can also burn traditional fuels such as gasoline, diesel oil and biodiesel.
The method adopts a double-oil-way oil supply mode automatically regulated by a floating ball oil separator 1-3, adopts an ignition plug 2 to preheat and ignite the fuel of the auxiliary oil way, effectively absorbs heat in an atomizing net 3, evaporates and ignites, and provides an ignition heat source for the fuel of the main oil way, thereby effectively solving the problem of difficult cold start of the alcohol-based fuel;
the main oil way fuel passes through the trapezoidal threads 5-1 on the main oil way partition plate 5, so that tangential oil supply is realized by the main oil way fuel through multiple rotational flows, and the main oil way fuel is preheated to a certain extent to be beneficial to ignition and combustion of the main oil way fuel;
adopt multistage whirl hole structure will be divided into root wind and two-stage whirl wind by the whole air that inlet channel supplied with and strengthen the hierarchical mixture of alcohol group fuel and air for alcohol group fuel and air misce bene are favorable to the stability of combustion process, export temperature distribution is even and NOx discharges and reduce.
The application is applied to the parking heater combustion chamber burning alcohol-based fuel and other liquid fuels, and has the characteristics of high efficiency, stability and low pollution.
Under the starting working condition, the ignition plug 2 is adopted to preheat and ignite the alcohol-based fuel tangentially supplied from the secondary oil path pipe section 15, so that the alcohol-based fuel effectively absorbs heat in the atomizing net 3, evaporates and ignites, then flows through the secondary oil path convergence channel 10 and is sprayed out from the secondary oil path fuel nozzle 11.
The oil feeding mechanism 1 comprises a buffer tank 1-1, an oil feeding pipe 1-2 and a floating ball oil distributor 1-3, wherein the oil feeding pipe 1-2 is fixedly communicated with the top of the buffer tank 1-1, the floating ball oil distributor 1-3 comprises an oil distributing pipeline 1-31, a floating ball 1-32 and an adjusting screw 1-33, the oil distributing pipeline 1-31 is vertically arranged, the bottom end of the oil distributing pipeline is communicated with the lower part of the buffer tank 1-1, the adjusting screw 1-33 is coaxially arranged at the top of the oil distributing pipeline 1-31 and is in threaded connection with the oil distributing pipeline 1-31, a throat part 1-34 is processed inside the oil distributing pipeline 1-31 below the adjusting screw 1-33, the floating ball 1-32 is positioned in the oil distributing pipeline 1-31 above the throat part 1-34, a main oil pipeline section 14 is fixedly connected with the oil distributing pipeline 1-31 above the throat part 1-34, the secondary oil path pipe section 15 is communicated and fixedly connected with the oil distribution pipelines 1-31 below the throats 1-34. The buffer tank 1-1 is positioned at one side of the inlet ends of the main oil path and the auxiliary oil path of the combustor, the oil supply pipe 1-2 is welded on the buffer tank 1-1, the oil pump supplies fuel to the buffer tank 1-1 through the oil supply pipe 1-2, one end of the oil distribution pipeline 1-31 is welded on the buffer tank 1-1, the other end of the oil distribution pipeline is sealed by an adjusting screw 1-33, and the flow area ratio of the main oil path and the auxiliary oil path is controlled by the screwing-in depth of the adjusting screw 1-33; the upper part of the throat part 1-34 is a tapered section, and the lower part is a tapered section. The floating ball 1-32 is a round ball with the diameter of 1.5-3 mm and made of special materials (mainly corrosion-resistant stainless steel materials such as 304 and 316l stainless steel). The arc thickness of the throat part 1-34 is in linear proportion to the fuel flow in unit time passing through the convex wall surface after the fuel pressure overcomes the floating ball 1-32, so that the flow range provided for the combustor can be accurately and effectively controlled, and the combustion performance of the combustion chamber is further improved.
A certain space is left between the lower ends of the adjusting screws 1-33 and the main oil path pipe section 14, and the space meets the requirement that the floating balls 1-32 can be completely accommodated when the fuel pressure overcomes the gravity of the floating balls 1-32, so that the fuel can smoothly enter the inlet end of the main oil path.
The oil pump supplies fuel oil to the buffer tank 1-1 through the oil supply pipe 1-2, and the buffer tank 1-1 supplies fuel oil to the main oil line pipe section 14 and the auxiliary oil line pipe section 15 through the floating ball oil separator 1-3.
The screw thread connection is formed between one end part of the reference piece 4 far away from the combustion chamber and the ignition plug 2, between one end part of the reference piece 4 far away from the combustion chamber and one end part of the burner housing 7, and between the other end part of the burner housing 7 and the positioning ring 19, and the close contact is formed between the outer surface of the atomization net 3 and the inner surface of the reference piece 4, and between one end of the atomization net 3 and the shaft shoulder on the ignition plug 2. The close contact is achieved by an interference fit.
The number of the winding turns of the trapezoidal thread 5-1 is 4-10, the thread pitch is 1-3 mm, the nominal diameter is 16-20 mm, the tooth form angle is 10-45 degrees, and the direction of the internal rotational flow of the trapezoidal thread 5-1 is the same as the rotating direction of air entering the primary rotational flow hole 16.
The number of the axial guide vanes 8 is 4-8, the axial guide vanes are uniformly distributed along the circumferential direction of the reference piece 4, the axial length of each axial guide vane 8 is smaller than or equal to 2/3 of the axial length of the partition plate main body, the axial length of each axial guide vane 8 is the extending distance of the tail end of the axial guide vane 8 pointing to one side of the combustion chamber, as shown in fig. 5, the projection of the included angle between the thread line and the axis in each axial guide vane 8 on the upper view reference plane is α, the α value is 30-60 degrees, and the size of any section on the spiral line is a rectangle of 1-3 mm.
The number of the primary rotational flow holes 16 is 8-12, the primary rotational flow holes are uniformly distributed along the circumferential direction of the reference piece 4, the primary rotational flow holes 16 are rectangular holes with the side length of 1-3 mm, and the projection of the included angle between the central axis of each primary rotational flow hole 16 and the central axis of the reference piece 4 on the section plane is 30-60 degrees; the number of the secondary vortex holes 17 is 8-16, the secondary vortex holes are uniformly distributed along the circumferential direction of the ventilation piece 6, and the secondary vortex holes 17 are round holes with the diameter of 1-3 mm; the quantity of tertiary whirl hole 18 is 12 ~ 24, and along 6 circumference equipartitions of ventilation piece, and tertiary whirl hole 18 is 2 ~ 6mm rectangular hole of length of side, and the projection of the contained angle on the section between every tertiary whirl hole 18's axis and the 6 axis of ventilation piece is 30 ~ 60. The secondary swirl holes 17 are tangentially arranged according to a certain eccentricity and form a certain angle with the axis of the burner, and the swirl direction of the secondary swirl holes is the same as that of the primary swirl holes 16 into which the atomized gas enters. The atomizing air enters tangentially into the tertiary swirl holes 18.
The central axes of the primary swirl holes 16, the secondary swirl holes 17 and the tertiary swirl holes 18 are arranged in the same direction. Namely, the central axes of the primary swirl holes 16, the secondary swirl holes 17 and the tertiary swirl holes 18 form the same included angle with the central axis of the ignition plug 2. Feeding of swirl holes at different positions or different time points is realized by controlling different included angles between the swirl holes and the axis of the ignition plug 2, so that accurately controlled staged combustion is achieved.
The inner diameter and the outer diameter of the main oil path pipe section 14 are both 1-3 mm, and the inner diameter and the outer diameter of the auxiliary oil path pipe section 15 are both 0.5-1.5 mm. By the design, the flow of oil supplied by the oil pump can be distributed according to a selected proportion; the axes of the inlet ends of the main oil passage and the auxiliary oil passage are parallel but are at a certain distance.
The diameter distance between the inner ring and the outer ring of the main oil path fuel nozzle 13 and the diameter distance between the inner ring and the outer ring of the auxiliary oil path fuel nozzle 11 are both 0.25-1 mm.
The ventilation member 6 is coaxially sleeved with a support wheel 24, and the outer circular surface of the support wheel 24 is in close contact with the positioning ring 19 and the inner circular surface of the support wheel 24 is in close contact with the ventilation member 6. So designed, the support of the burner housing 7 and the positioning ring 19 is achieved by the support wheel 24. The supporting wheel 24 may be selected or not according to the strength of the processing material of the ventilation member 6 and the housing.
The working principle is as follows:
under the starting working condition, the ignition plug 2 is started firstly, then the oil pump is started to supply oil to the buffer tank 1-1, and the buffer tank 1-1 supplies oil to the floating ball oil separator 1-3 uniformly, so that the oil supply pressure is low and is not enough to overcome the gravity of the floating ball 1-32 positioned at the upper end of the throat part 1-34, the alcohol-based fuel in the floating ball oil separator 1-3 can only flow to the auxiliary oil path pipe section 15, and then enters the reference part 4 along the tangential direction and is rapidly diffused in the atomization net 3, and under the action of the heat provided by the ignition plug 2, the alcohol-based fuel diffused in the atomization net 3 can rapidly absorb the heat and is rapidly evaporated in the auxiliary oil path pipe; meanwhile, air of the air inlet channel passes through the vent hole 20, passes through a cavity formed by the combustor shell 7 and the ventilation piece 6, tangentially enters the auxiliary oil path channel from the primary swirl hole 16, and carries out auxiliary atomization and combustion supporting on alcohol-based fuel, and the alcohol-based fuel in the auxiliary oil path channel is atomized and ignited under the action of tangential shear force of the air to form a rotating flame sprayed out through the auxiliary oil path fuel nozzle 11, so that the pilot flame can be played when the main oil path fuel is ignited.
When the pressure of the fuel supply is gradually increased to overcome the gravity of the floating balls 1-32, the fuel can flow through the main oil circuit pipe section 15 and the auxiliary oil circuit pipe section 15 simultaneously; at the moment, the alcohol-based fuel of the main oil path pipe section 14 swirls in the trapezoidal thread 5-1 for a plurality of times and is sprayed out from the main oil path fuel nozzle 13, and the alcohol-based fuel is fed in a delayed manner due to the floating ball oil separator 1-3 and the trapezoidal thread 5-1, so that the alcohol-based fuel is sprayed out after forming stable flame at the auxiliary oil path fuel nozzle 11, and the stable combustion of the main oil path fuel can be ensured after the auxiliary oil path flame is preheated and ignited. A secondary swirl hole 17 and a tertiary swirl hole 18 are processed on the ventilation piece 6, the two swirl holes respectively support combustion of alcohol-based fuel sprayed from the main oil circuit fuel nozzle 11 and the auxiliary oil circuit fuel nozzle 11, and a backflow area can be formed to ensure the combustion stability of main flame due to the combustion stabilizing principle of swirl combustion; through the graded feeding of air, the effect of the mixing process is better, the mixing is more uniform, thereby being beneficial to the stability of the combustion process, the uniform distribution of the outlet temperature and the reduction of NOx emission.
Claims (10)
1. The utility model provides a multistage whirl parking heater fuel feeding combustion system which characterized in that: the oil supply device comprises an oil supply mechanism (1) and a combustor, wherein the combustor comprises an ignition plug (2), an atomization net (3), a reference part (4), a main oil way partition plate (5), a ventilation part (6) and a combustor shell (7) which are coaxially arranged, the ignition plug (2) is a variable-diameter cylindrical section, the reference part (4) is sleeved on the ignition plug (2), an annular cavity is formed between the middle part of the reference part (4) and the ignition plug (2), and a plurality of axial guide vanes (8) are processed on the outer surface of the reference part (4);
the atomization net (3) is of a hollow cylindrical structure and is arranged in an annular cavity between the reference piece (4) and the ignition plug (2), an annular gap is formed between the inner surface of the atomization net (3) and the ignition plug (2),
the main oil way partition plate (5) is of a hollow cylindrical structure sleeved on the reference part (4), trapezoidal threads (5-1) are machined on the outer surface of the main oil way partition plate, a plurality of axial guide vanes (8) are positioned between the main oil way partition plate (5) and the reference part (4) to form a root part air flow channel, one end part of the ventilation part (6) far away from the combustion chamber is coaxially sleeved on the main oil way partition plate (5), and a main oil way channel (9) is formed between the ventilation part (6) and the main oil way partition plate (5) through the trapezoidal threads (5-1),
one end part of the reference piece (4) close to the combustion chamber is a tapered section, an auxiliary oil path convergence channel (10) is formed between the tapered section and the ignition plug (2), one end of the auxiliary oil path convergence channel (10) close to the combustion chamber is an auxiliary oil path fuel nozzle (11), a main oil path convergence channel (12) is formed between the inner surface of the ventilation piece (6) and the outer surface of the tapered section of the reference piece (4), one end of the main oil path convergence channel (12) close to the combustion chamber is a main oil path fuel nozzle (13),
the outlet end of the main oil path channel (9) is arranged close to the main oil path convergence channel (12), the inlet end of the main oil path is communicated and fixedly connected with a main oil path pipe section (14), an auxiliary oil path pipe section (15) is tangentially inserted on the reference part (4), the auxiliary oil path pipe section (15) is far away from the combustion chamber, the end part of the auxiliary oil path pipe section (15) is communicated with an annular cavity where the atomizing net (3) is positioned, the oil supply mechanism (1) is communicated with the combustor through the main oil path pipe section (14) and the auxiliary oil path pipe section (15) respectively,
a plurality of primary swirl holes (16) are circumferentially processed at a position, close to the tapered section, on the reference part (4), a plurality of secondary swirl holes (17) and a plurality of tertiary swirl holes (18) are processed at the middle part of the ventilation part (6), a positioning ring (19) is fixedly and circumferentially arranged on the outer surface of the ventilation part (6) between the plurality of secondary swirl holes (17) and the plurality of tertiary swirl holes (18), the axial section of the positioning ring (19) is L-shaped, a plurality of vent holes (20) are circumferentially arranged on the positioning ring (19), one end part, close to the combustion chamber, on the ventilation part (6) is a straight section, a flame tube shell (21) of the combustion chamber is sleeved on the straight section in a matching way, a casing shell (22) of the combustion chamber is sleeved on the positioning ring (19) in a matching way, an air inlet channel (23) is formed between the flame tube shell (21) and the casing shell (22), the primary swirl holes (16) and the secondary swirl holes (17) are communicated, the combustor shell (7) is sleeved outside the ventilation piece (6), one end of the combustor shell (7) is fixedly connected with the reference piece (4), and the other end of the combustor shell (7) is fixedly connected with the positioning ring (19).
2. The multi-stage cyclone parking heater oil supply combustion system as claimed in claim 1, wherein: the oil feeding mechanism (1) comprises a buffer tank (1-1), an oil feeding pipe (1-2) and a floating ball oil distributor (1-3), wherein the oil feeding pipe (1-2) is fixedly communicated with the top of the buffer tank (1-1), the floating ball oil distributor (1-3) comprises an oil distributing pipeline (1-31), a floating ball (1-32) and an adjusting screw (1-33), the oil distributing pipeline (1-31) is vertically arranged, the bottom end of the oil distributing pipeline is communicated with the lower part of the buffer tank (1-1), the adjusting screw (1-33) is coaxially arranged at the top of the oil distributing pipeline (1-31) and is in threaded connection with the oil distributing pipeline (1-31), a throat part (1-34) is machined in the oil distributing pipeline (1-31) below the adjusting screw (1-33), the floating ball (1-32) is positioned in the oil distributing pipeline (1-31) above the throat part (1-34), the main oil path pipe section (14) is fixedly connected with the oil distribution pipeline (1-31) above the throats (1-34) in a communicating mode, and the auxiliary oil path pipe section (15) is fixedly connected with the oil distribution pipeline (1-31) below the throats (1-34) in a communicating mode.
3. The multi-stage swirl parking heater oil-fed combustion system according to claim 1 or 2, characterized in that: and one end part of the reference piece (4) far away from the combustion chamber is in threaded connection with the ignition plug (2), one end part of the reference piece (4) far away from the combustion chamber is in threaded connection with one end part of the burner shell (7), the other end part of the burner shell (7) is in threaded connection with the positioning ring (19), and the outer surface of the atomization net (3) is in close contact with the inner surface of the reference piece (4) and one end of the atomization net (3) is in close contact with a shaft shoulder on the ignition plug (2).
4. The multi-stage swirl parking heater oil supply combustion system of claim 3, characterized in that: the number of the surrounding circles of the trapezoidal threads (5-1) is 4-10 circles, the thread pitch is 1-3 mm, the nominal diameter is 16-20 mm, the tooth form angle is 10-45 degrees, and the inner rotational flow direction of the trapezoidal threads (5-1) is the same as the rotational direction of air entering the primary rotational flow hole (16).
5. The multi-stage swirl parking heater oil supply combustion system of claim 4, characterized in that: the number of the axial guide vanes (8) is 4-8, the axial guide vanes are uniformly distributed along the circumferential direction of the reference piece (4), and the axial length of each axial guide vane (8) is smaller than or equal to 2/3 of the axial length of the partition plate main body.
6. The multi-stage swirl parking heater oil-fed combustion system of claim 1, 2, 4 or 5, characterized in that: the number of the primary rotational flow holes (16) is 8-12, the primary rotational flow holes are uniformly distributed along the circumferential direction of the reference piece (4), the primary rotational flow holes (16) are rectangular holes with the side length of 1-3 mm, and the projection of an included angle between the central axis of each primary rotational flow hole (16) and the central axis of the reference piece (4) on a section is 30-60 degrees; the number of the secondary vortex holes (17) is 8-16, the secondary vortex holes are uniformly distributed along the circumferential direction of the ventilation piece (6), and the secondary vortex holes (17) are round holes with the diameter of 1-3 mm; the quantity of tertiary whirl hole (18) is 12 ~ 24, and along ventilation piece (6) circumference equipartition, and tertiary whirl hole (18) are 2 ~ 6mm rectangular hole of length of side, and the projection of the contained angle on the section between the axis of every tertiary whirl hole (18) and ventilation piece (6) axis is 30 ~ 60.
7. The multi-stage swirl parking heater oil supply combustion system of claim 6, characterized in that: the central axes of the primary swirl holes (16), the secondary swirl holes (17) and the tertiary swirl holes (18) are arranged in the same direction.
8. The multi-stage swirl parking heater oil-fed combustion system of claim 1, 2, 4, 5 or 7, characterized in that: the inner diameter and the outer diameter of the main oil path pipe section (14) are both 1-3 mm, and the inner diameter and the outer diameter of the auxiliary oil path pipe section (15) are both 0.5-1.5 mm.
9. The multi-stage swirl parking heater oil-feeding combustion system of claim 8, characterized in that: the diameter distance between the inner ring and the outer ring of the main oil path fuel nozzle (13) and the diameter distance between the inner ring and the outer ring of the auxiliary oil path fuel nozzle (11) are both 0.25-1 mm.
10. A multi-stage swirl parking heater oil fed combustion system according to claim 1, 2, 4, 5, 7 or 9, characterized in that: the ventilation piece (6) is coaxially sleeved with a supporting wheel (24), and the outer circular surface of the supporting wheel (24) is in close contact with the positioning ring (19) and the inner circular surface of the supporting wheel (24) is in close contact with the ventilation piece (6).
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| CN202010131674.0A CN111237753B (en) | 2020-02-29 | 2020-02-29 | Oil supply combustion system of multistage rotational flow parking heater |
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| CN202010131674.0A CN111237753B (en) | 2020-02-29 | 2020-02-29 | Oil supply combustion system of multistage rotational flow parking heater |
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| CN111237753B CN111237753B (en) | 2024-06-18 |
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| CN211781232U (en) * | 2020-02-29 | 2020-10-27 | 哈尔滨工业大学 | Multistage swirl miniature gas turbine combustor |
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2020
- 2020-02-29 CN CN202010131674.0A patent/CN111237753B/en active Active
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| DE4238718A1 (en) * | 1992-11-17 | 1994-05-19 | Hoval Interliz Ag Vaduz Neugut | Equipment for burning heating oil - has pressureless oil introduced into inclined channel and flowing under gravity to be evaporated before channel end by external heating with air exclusion |
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