CN111853771B - Liquid fuel porous medium combustor with cold flame pre-evaporation function - Google Patents
Liquid fuel porous medium combustor with cold flame pre-evaporation function Download PDFInfo
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- CN111853771B CN111853771B CN202010734974.8A CN202010734974A CN111853771B CN 111853771 B CN111853771 B CN 111853771B CN 202010734974 A CN202010734974 A CN 202010734974A CN 111853771 B CN111853771 B CN 111853771B
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- 239000007788 liquid Substances 0.000 title claims abstract description 98
- 239000000446 fuel Substances 0.000 title claims abstract description 78
- 238000001704 evaporation Methods 0.000 title claims abstract description 33
- 230000008020 evaporation Effects 0.000 title claims abstract description 30
- 238000002485 combustion reaction Methods 0.000 claims abstract description 129
- 238000001816 cooling Methods 0.000 claims abstract description 69
- 239000003546 flue gas Substances 0.000 claims abstract description 59
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 54
- 239000000498 cooling water Substances 0.000 claims abstract description 40
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 13
- 231100000719 pollutant Toxicity 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000009413 insulation Methods 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 17
- 239000000779 smoke Substances 0.000 claims description 14
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- 239000006200 vaporizer Substances 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 230000033228 biological regulation Effects 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract 1
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 28
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000004965 Silica aerogel Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 150000003384 small molecules Chemical class 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 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
- F23D11/10—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour
- F23D11/22—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space the spraying being induced by a gaseous medium, e.g. water vapour the gaseous medium being vaporised fuel, e.g. for a soldering lamp, or other gaseous fuel
-
- 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
- F23D11/441—Vaporising devices incorporated with burners
- F23D11/446—Vaporising devices incorporated with burners heated by an auxiliary flame
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
Abstract
The invention discloses a liquid fuel porous medium burner with cold flame pre-evaporation, belonging to the field of micro energy. The invention comprises a pressure swirl nozzle, a cold flame gasifier fixing ring, a cooling water outlet, a combustion chamber water cooling channel, a combustion chamber shell, a cooling water drainage channel, a flue gas channel water cooling channel, a cooling water inlet, a combustion chamber heat insulation layer, a combustion section porous medium, a preheating section porous medium, a cold flame gasifier heat insulation layer, an air inlet, a combustor upper cover and the like. The liquid fuel porous medium burner combines the cold flame pre-evaporation and micro-combustion technology, can improve the combustion efficiency of the burner, reduces the pollutant emission and has wide burner power regulation range and combustion equivalence ratio range. The user only needs to feed liquid fuel into the pressure swirl nozzle to obtain the energy generated by combustion, and the device has the advantages of environmental protection, high efficiency and portability. The invention can be used as an energy source of microminiature equipment by pre-evaporating liquid fuel and then burning the liquid fuel to generate energy.
Description
Technical Field
The invention relates to a liquid fuel porous medium burner with cold flame pre-evaporation, in particular to a porous medium burner using liquid fuel and having pre-evaporation capacity, belonging to the field of micro energy.
Background
With the development of scientific technology, the processing technology of micro equipment is more mature, people pay more attention to the micro equipment, and meanwhile, the liquid fuel is used as an energy source, so that the micro equipment has the advantages of easiness in storage and high energy density compared with common gas fuel. However, as micro-devices become mature and increasingly demanded, new requirements are put on power supply devices, and the use of micro-combustion devices as energy sources of power supply devices is one of the choices, and the micro-combustion devices are also required to have the characteristics of small external dimensions, low pollutant discharge, wide range of equivalence ratio of combustion, and wide adjustable range of burner power.
The traditional liquid fuel combustion technology at present sprays liquid fuel into a high-temperature combustion chamber, and the evaporation premixing of the liquid fuel is enhanced by utilizing the high temperature of the combustion chamber, but the evaporation and combustion processes of the liquid fuel cannot be well separated, so that the liquid fuel and air are not beneficial to premixed combustion, and the insufficient combustion of the liquid fuel is inevitably caused, thereby generating the problems of low energy density and high pollutant emission of a combustion device. In addition, solid particles produced by insufficient combustion of the liquid fuel are likely to clog the porous media, rendering the porous media burner ineffective. The invention utilizes the cold flame reaction of the liquid fuel to release heat, pre-evaporates the liquid fuel before the liquid fuel burns, separates the evaporation and the burning process of the liquid fuel, and improves the burning efficiency of the burner. Therefore, the invention of the liquid fuel porous medium burner with the cold flame pre-evaporation function becomes practical.
Disclosure of Invention
The invention aims to solve a series of problems of high pollutant emission, low energy density and the like caused by the fact that liquid fuel evaporation and combustion processes cannot be well separated in the traditional liquid fuel combustion process, and aims to provide a liquid fuel porous medium combustor with cold flame pre-evaporation. The liquid fuel can be supplied into the combustor through the liquid inlet of the pressure swirl nozzle, and the combustion power of the combustor can be adjusted by adjusting the fuel supply pressure of the pressure swirl nozzle, so that energy is provided for the outside.
The purpose of the invention is realized by the following technical scheme.
The invention discloses a liquid fuel porous medium burner with cold flame pre-evaporation function, which comprises a pressure swirl nozzle, a nozzle swirl chamber liquid inlet, a swirl chamber, a nozzle outlet, a bolt, a gasket, a nut and a pressure swirl nozzle liquid inlet. The device also comprises a cooling water outlet, a cold flame gasifier fixing ring, a combustion chamber water-cooling channel, a combustion chamber shell, a combustion chamber water-cooling channel wall surface, a combustion chamber water-cooling channel supporting body, a flue gas channel connecting body, a cooling water drainage channel, a flue gas channel water-cooling channel wall surface, a flue gas channel water-cooling channel, a cooling water inlet, a flue gas channel wall surface, a flue gas channel water-cooling channel supporting body, a combustion chamber heat insulating layer, a combustion section porous medium, a preheating section porous medium, a cold flame gasifier wall surface, a cold flame gasifier heat insulating layer, an air inlet and a combustor upper cover.
The pressure swirl nozzle comprises two parts, namely liquid fuel inlet at the upper end and swirl injection at the lower end; the liquid inlet part of the liquid fuel at the upper end is provided with a liquid inlet of a pressure cyclone nozzle, and the cyclone jet part at the lower end is provided with a liquid inlet of a nozzle cyclone chamber, a cyclone chamber and a nozzle outlet; the liquid fuel inlet at the upper end and the swirl injection at the lower end are connected with each other through threads, and the pressure swirl nozzle is connected to the upper cover of the burner through threads; the burner upper cover is provided with a pressure swirl nozzle connecting hole, an internal thread for connecting the pressure swirl nozzle is arranged in the hole, and the side surface of the burner upper cover is symmetrically provided with an air inlet; the upper cover of the burner is connected with the main body part of the combustion chamber through the same bolt; the main body part of the combustor is a hollow cylinder, the middle of the main body part is provided with a cold flame gasifier, and the cold flame gasifier is fixed in the center of the main body of the combustion chamber through cold flame gasifier fixing rings which are arranged up and down; the cold flame gasifier is of a cylindrical structure with an open upper end and a closed lower end; the periphery of the cold flame gasifier is filled with a preheating section porous medium and a combustion section porous medium, the preheating section porous medium is used for preheating the incoming flow fuel air premixed gas, the temperature of the premixed gas is increased, the pollutant emission is reduced in the subsequent combustion process, and the uniform combustion of the premixed gas is facilitated; the combustion section porous medium is mainly used for combustion of premixed gas and flame stabilization, and has the effects of reducing pollutant emission and facilitating uniform combustion of the premixed gas; the combustion chamber shell is connected with the wall surface of the combustion chamber water-cooling channel to form an annular combustion chamber water-cooling channel; the combustion chamber main body is connected with the smoke channel connecting body at the lower end through the same bolt; the smoke channel connecting body is connected with a smoke channel, and the smoke channel is a hollow cylinder; the wall surface of the flue gas channel and the wall surface of the water-cooling channel of the flue gas channel jointly form a hollow water-cooling channel of the flue gas channel.
And the outer side of the wall surface of the cold flame gasifier and the inner side of the combustion chamber shell are respectively provided with a heat insulating layer of the cold flame gasifier and a heat insulating layer of the combustion chamber.
The cold flame vaporizer fixing ring is of an annular structure, and vent holes are uniformly distributed on the ring wall around the central hole.
The combustion chamber water-cooling channel is connected with the flue gas channel water-cooling channel through a cooling water drainage channel on the flue gas channel connecting body, so that the cooling water flow is communicated, and the cross section of the cooling water drainage channel is in a circular ring shape.
The wall surface of the water-cooling channel of the flue gas channel and the wall surface of the water-cooling channel of the combustion chamber are respectively provided with a cooling water inlet and a cooling water outlet, and the cross sections of the cooling water inlet and the cooling water outlet are both circular rings.
The wall surface of the flue gas channel and the wall surface of the water-cooling channel of the flue gas channel are fixedly connected through flue gas channel water-cooling channel supporting bodies which are uniformly distributed in the circumferential direction.
The combustion chamber shell is fixedly connected with the wall surface of the combustion chamber water-cooling channel through combustion chamber water-cooling channel supporting bodies which are uniformly distributed in the circumferential direction.
Has the advantages that:
1. in order to solve a series of problems of high pollutant emission, low energy density and the like caused by the fact that liquid fuel evaporation and combustion processes cannot be well separated in the traditional liquid fuel combustion, the invention discloses a liquid fuel porous medium combustor with cold flame pre-evaporation. The liquid fuel can be supplied into the combustor through the liquid inlet of the pressure swirl nozzle, and the combustion power of the combustor can be adjusted by adjusting the fuel supply pressure of the pressure swirl nozzle, so that energy is provided for the outside.
2. The liquid fuel porous medium burner with the cold flame pre-evaporation, disclosed by the invention, adopts the pre-evaporation scheme of pre-evaporating the liquid fuel by heat release of the cold flame reaction of the liquid fuel, can well separate the evaporation and combustion processes of the liquid fuel, and is favorable for the premixed combustion of the fuel and air, so that the combustion efficiency of the burner is improved, and the adjustment range of the power of the burner is widened.
3. The invention discloses a liquid fuel porous medium burner with cold flame pre-evaporation, which adopts a porous medium micro-combustion technology and has the advantages of full combustion, low heat loss and low emission of combustion pollutants.
4. The liquid fuel porous medium burner with the cold flame pre-evaporation function, disclosed by the invention, adopts a mode of combining water flow cooling and heat insulation materials, ensures the heat intensity of the burner, reduces the structural size of the burner, controls the heat release of the burner to the outside, and has the advantages of small heat loss, low temperature of the outer wall of the burner, capability of effectively preventing personnel from being scalded and good man-machine environment. Furthermore, the emission of pollutants is reduced by the flue gas cooling channel.
5. The invention discloses a liquid fuel porous medium burner with cold flame pre-evaporation, wherein liquid fuel can be supplied into the burner through a liquid inlet of a pressure swirl nozzle, and the combustion power of the burner can be adjusted by adjusting the oil supply pressure of the pressure swirl nozzle, so that the utilization rate of energy is improved.
Drawings
FIG. 1 is a cross-sectional view of a liquid fuel porous media burner in an embodiment;
FIG. 2 is a front cross-sectional view and a top view of a pressure swozzle injection portion of a liquid fuel porous media combustor in an embodiment;
FIG. 3 is a sectional view taken along lines A-A, B-B and C-C of a liquid fuel porous media burner in an embodiment;
FIG. 4 is a front view and a top view of a flue gas channel interface of a liquid fuel porous media burner in an embodiment;
FIG. 5 is a schematic illustration of a cold flame vaporizer retaining ring for a liquid fuel porous media burner, in an embodiment.
Wherein, 1-pressure cyclone nozzle, 2-nozzle cyclone chamber liquid inlet, 3-cyclone chamber, 4-nozzle outlet, 5-bolt, 6-gasket, 7-nut, 8-cooling water outlet, 9-cold flame vaporizer fixed ring, 10-combustion chamber water cooling channel, 11-combustion chamber shell, 12-combustion chamber water cooling channel wall, 13-combustion chamber water cooling channel support, 14-flue gas channel connector, 15-cooling water diversion channel, 16-flue gas channel water cooling channel wall, 17-flue gas channel water cooling channel, 18-cooling water inlet, 19-flue gas channel wall, 20-flue gas channel water cooling channel support, 21-combustion chamber heat insulation layer, 22-combustion section porous medium, 23-preheating section porous medium, 24-cold flame vaporizer wall, 25-cold flame vaporizer, 26-cold flame vaporizer, 27-air inlet, 28-combustor heat insulation layer, 29-pressure swirl nozzle inlet.
Detailed Description
For a better understanding of the objects and advantages of the present invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings.
Example 1
The liquid fuel porous medium burner of the embodiment adopts liquid heptane as fuel, as shown in fig. 1, the liquid heptane fuel is supplied into the pressure cyclone nozzle 1 through the liquid inlet 29 of the pressure cyclone nozzle and then atomized and sprayed into the combustion device, and the power of the burner can be adjusted only by adjusting the oil supply pressure of the pressure cyclone nozzle 1 and then adjusting the fuel supply amount.
The liquid fuel porous medium burner with the cold flame pre-evaporation disclosed in this embodiment, as shown in fig. 1, includes a pressure swozzle 1, a nozzle swirl chamber liquid inlet 2, a swirl chamber 3, a nozzle outlet 4, a bolt 5, a gasket 6, a nut 7, and a pressure swozzle liquid inlet 29. The device also comprises a cooling water outlet 8, a cold flame gasifier fixing ring 9, a combustion chamber water-cooling channel 10, a combustion chamber shell 11, a combustion chamber water-cooling channel wall surface 12, a combustion chamber water-cooling channel support body 13, a flue gas channel connecting body 14, a cooling water drainage channel 15, a flue gas channel water-cooling channel wall surface 16, a flue gas channel water-cooling channel 17, a cooling water inlet 18, a flue gas channel wall surface 19, a flue gas channel water-cooling channel support body 20, a combustion chamber heat-insulating layer 21, a combustion section porous medium 22, a preheating section porous medium 23, a cold flame gasifier wall surface 24, a cold flame gasifier 25, a cold flame gasifier heat-insulating layer 26, an air inlet 27 and a combustor upper cover 28.
The pressure cyclone nozzle 1 is made of 95Cr18 stainless steel material, and the pressure cyclone nozzle 1 comprises a liquid fuel inlet part at the upper end and a cyclone injection part at the lower end; the liquid inlet part of the liquid fuel at the upper end is provided with a pressure cyclone nozzle liquid inlet 29, the liquid inlet is 14mm in diameter, the cyclone jet part at the lower end is provided with a nozzle cyclone chamber liquid inlet 2, a cyclone chamber 3 and a nozzle outlet 4, wherein the nozzle cyclone chamber liquid inlet 2 is 3mm in diameter and is uniformly distributed in the circumferential direction, as shown in figure 2, the cyclone chamber 3 is 16mm in diameter, and the nozzle outlet 4 is 2mm in diameter; the liquid fuel inlet at the upper end and the swirl injection at the lower end are connected with each other through a thread pair with the nominal diameter of 36mm and the thread pitch of 1.5 mm; the pressure swirl nozzle 1 is connected to the upper cover 28 of the burner through a thread pair with nominal diameter of 22mm and thread pitch of 1.5 mm; the burner upper cover 28 is provided with a pressure swirl nozzle connecting hole, an internal thread for connecting the pressure swirl nozzle is arranged in the hole, two air inlets 27 are symmetrically arranged on the side surface of the burner upper cover 28, the diameter of each air inlet 27 is 3mm, and a fan can be arranged for adjusting the air flow; the burner upper cover 28 is connected with the combustion chamber main body part through 4M 5 bolts; the main body part of the combustor is a hollow cylinder, the middle part of the main body part is provided with a cold flame gasifier 25, the inner diameter of the cold flame gasifier 25 is 25mm, the wall thickness is 2mm, the length is 70mm, and the cold flame gasifier 25 is fixed in the center of the main body of the combustion chamber through two cold flame gasifier fixing rings 9 which are arranged up and down; the cold flame gasifier 25 is a cylinder structure with an open upper end and a closed lower end; the periphery of the cold flame gasifier 25 is filled with a preheating section porous medium 23 and a combustion section porous medium 22, wherein the preheating section porous medium 23 is made of foamed aluminum oxide material with the pore size of 65ppi and the porosity of 84%, the combustion section porous medium 22 is made of foamed aluminum oxide material with the pore size of 10ppi and the porosity of 87%, and the filling thickness of the two sections of porous media is 75 mm; the preheating section porous medium 23 is used for preheating the incoming flow fuel air premixed gas, so that the temperature of the premixed gas is increased, the pollutant emission in the subsequent combustion process is reduced, and the uniform combustion of the premixed gas is facilitated; the combustion section porous medium 22 is mainly used for combustion of premixed gas and flame stabilization, and has the effects of reducing pollutant emission and facilitating uniform combustion of the premixed gas; the wall thickness of the combustion chamber shell 11 is 3mm, and the wall surface 12 of the combustion chamber water-cooling channel is 2 mm; the cross section of the combustion chamber water-cooling channel 10 is circular, the diameter of the inner ring of the circular ring is 45mm, the diameter of the outer ring of the circular ring is 53mm, and the combustion chamber water-cooling channel is formed by connecting a combustion chamber shell 11 with the wall surface 12 of the combustion chamber water-cooling channel; the combustion chamber main body and the flue gas channel connecting body 14 at the lower end are connected with each other through 4M 5 bolts, the outer diameter of the flue gas channel connecting body is 83mm, and a flue gas convergence channel with the diameter of 28mm is arranged at the center, as shown in FIG. 4; the smoke channel connecting body 14 is connected with a smoke channel, the smoke channel is a hollow cylinder, the diameter of the smoke channel is 24mm, and the wall surface 19 of the smoke channel is 1mm in thickness; the flue gas channel wall surface 19 and the flue gas channel water-cooling channel wall surface 16 jointly form a through flue gas channel water-cooling channel 17, the cross section of the flue gas channel water-cooling channel 17 is in a ring shape, the diameter of an inner ring is 26mm, the diameter of an outer ring is 34mm, and the thickness of the flue gas channel water-cooling channel wall surface 16 is 2 mm; the combustor components and structures are made of pressure vessel steel Q345R except for the pressure swirl nozzle 1, the preheating section porous medium 23, the combustion section porous medium 22, the combustion chamber heat insulating layer 21, the cold flame gasifier heat insulating layer 26 and the cold flame gasifier fixing ring 9.
The outer side of the wall surface 24 of the cold flame gasifier and the inner side of the combustion chamber shell 11 are respectively provided with a cold flame gasifier heat-insulating layer 26 and a combustion chamber heat-insulating layer 21, wherein the laying thickness of the cold flame gasifier heat-insulating layer 26 is 1mm, the laying thickness of the combustion chamber heat-insulating layer 21 is 1.5mm, and the materials are all silica aerogel heat-insulating materials.
The fixing ring 9 of the cold flame gasifier is of an annular structure, as shown in fig. 5, vent holes are uniformly distributed on the annular wall around the central hole, the fixing ring is made of high-temperature-resistant ceramic materials, and the thickness of the fixing ring is 3 mm.
The combustion chamber water-cooling channel 10 and the flue gas channel water-cooling channel 17 are connected through a cooling water drainage channel 15 on a flue gas channel connector 14, so that the cooling water flow is communicated, the cross section of the cooling water drainage channel is in a ring shape, the inner diameter is 3mm, the wall thickness is 1mm, and the main view and the top view of the flue gas channel connector are shown in fig. 4.
The wall surface 16 of the water-cooling passage of the flue gas passage and the wall surface 12 of the water-cooling passage of the combustion chamber are respectively provided with a cooling water inlet 18 and a cooling water outlet 8, the cross sections of the cooling water inlet 18 and the cooling water outlet 8 are both circular rings, the inner diameters of the cooling water inlet 18 and the cooling water outlet 8 are both 3mm, and the wall thickness is 1 mm.
The flue gas channel wall surface 19 and the flue gas channel water-cooling channel wall surface 16 are fixedly connected with the flue gas channel water-cooling channel wall surface 16 through 16 flue gas channel water-cooling channel supporting bodies 20 which are uniformly distributed in the circumferential direction, and the supporting bodies are spherical with the diameter of 4 mm.
The combustion chamber shell 11 is fixedly connected with the wall surface 12 of the combustion chamber water-cooling channel through 12 combustion chamber water-cooling channel supporting bodies 13 which are uniformly distributed in the circumferential direction, and the supporting bodies are all spherical with the diameter of 4 mm.
The total length of the burner is 254mm, the cross section diameter of the burner pressure swirl nozzle is 42mm, and the maximum diameter of the cross section of the burner is 83 mm. The internal structure of the burner is shown in fig. 3.
The working method of the liquid fuel porous medium burner with the cold flame pre-evaporation disclosed by the embodiment comprises the following steps: liquid heptane fuel is supplied to a liquid inlet 29 of the pressure cyclone nozzle 1 of the burner, and the liquid heptane is rotated and crushed by the cyclone chamber 3 of the pressure cyclone nozzle and then sprayed out through the nozzle outlet 4 to form fine liquid drops. Air enters the burner through an air inlet 27 and a fan may also be installed at the air inlet 27 for air flow regulation. Then heptane liquid drops and air enter a cold flame gasifier 25, meanwhile, heat generated by combustion in a combustion chamber is transmitted into the cold flame gasifier through a cold flame gasifier heat insulation layer 26 and a cold flame gasifier wall surface 24, so that the temperature in the cold flame gasifier 25 reaches the condition of liquid heptane fuel cold flame reaction, the heptane cold flame reaction releases heat to enable the liquid heptane to be completely evaporated, evaporated gaseous heptane flows back and is fully premixed with the air to enter a porous medium area of the combustion chamber, the heptane liquid drops and the air enter a combustion section porous medium 22 for combustion after being preheated and heated by a preheating section porous medium 23, flame is stabilized at an interface of the preheating section porous medium 23 and the combustion section porous medium 22, part of heat released by combustion is discharged by smoke gas through a smoke passage, and the other part of heat enters the cold flame gasifier 25 for evaporating the liquid heptane fuel, the rest heat enters the cooling water through the combustion chamber shell 11 and is taken away by the cooling water, so that the temperature of the outer wall surface of the whole combustor is not too high, and personnel can be scalded. When the burner needs to stop working, the burner can be stopped only by stopping the fuel supply and the air supply. In the starting stage of the burner, since the small molecules and active radicals generated by the cold flame reaction of the liquid heptane are easy to ignite, an external igniter is adopted to ignite the preheating burner at the outlet of the flue gas channel of the burner, and the heptane fuel can be combusted to release heat as long as the liquid heptane is continuously fed when the steady state is reached.
The above description is further illustrative of the objects, technical solutions and advantages of the present invention, and it should be understood that the above description is only exemplary of the present invention, and is not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A liquid fuel porous medium burner with cold flame pre-evaporation function comprises a pressure cyclone nozzle (1), a nozzle cyclone chamber liquid inlet (2), a cyclone chamber (3), a nozzle outlet (4), a bolt (5), a gasket (6), a nut (7) and a pressure cyclone nozzle liquid inlet (29); the method is characterized in that: the device is characterized by further comprising a cooling water outlet (8), a cold flame gasifier fixing ring (9), a combustion chamber water-cooling channel (10), a combustion chamber shell (11), a combustion chamber water-cooling channel wall surface (12), a combustion chamber water-cooling channel supporting body (13), a flue gas channel connecting body (14), a cooling water drainage channel (15), a flue gas channel water-cooling channel wall surface (16), a flue gas channel water-cooling channel (17), a cooling water inlet (18), a flue gas channel wall surface (19), a flue gas channel water-cooling channel supporting body (20), a combustion chamber heat-insulating layer (21), a combustion section porous medium (22), a preheating section porous medium (23), a cold flame gasifier wall surface (24), a cold flame gasifier (25), a cold flame gasifier heat-insulating layer (26), an air inlet (27) and a combustor upper cover (28);
the pressure swirl nozzle comprises two parts, namely liquid fuel inlet at the upper end and swirl injection at the lower end; the liquid inlet part of the liquid fuel at the upper end is provided with a pressure swirl nozzle liquid inlet (29), and the swirl injection part at the lower end is provided with a nozzle swirl chamber liquid inlet (2), a swirl chamber (3) and a nozzle outlet (4); the liquid fuel inlet at the upper end and the swirl injection at the lower end are connected with each other through threads, and the pressure swirl nozzle (1) is connected to an upper cover (28) of the burner through threads; the burner upper cover (28) is provided with a pressure swirl nozzle connecting hole, an internal thread for connecting the pressure swirl nozzle is arranged in the hole, and meanwhile, the side surface of the burner upper cover (28) is symmetrically provided with an air inlet (27); the burner upper cover (28) is connected with the main part of the combustion chamber through the same bolt (5); the main body part of the combustor is a hollow cylinder, the middle part of the main body part is provided with a cold flame gasifier (25), and the cold flame gasifier (25) is fixed in the center of the main body of the combustion chamber through cold flame gasifier fixing rings (9) which are arranged up and down; the cold flame gasifier (25) is a cylinder structure with an open upper end and a closed lower end; the periphery of the cold flame gasifier is filled with a preheating section porous medium (23) and a combustion section porous medium (22), the preheating section porous medium (23) is used for preheating the incoming flow fuel air premixed gas, the temperature of the premixed gas is increased, the pollutant emission in the subsequent combustion process is reduced, and the uniform combustion of the premixed gas is facilitated; the combustion section porous medium (22) is mainly used for combustion of premixed gas and flame stabilization, and has the effects of reducing pollutant emission and facilitating uniform combustion of the premixed gas; the combustion chamber shell (11) is connected with the wall surface (12) of the combustion chamber water-cooling channel to form an annular combustion chamber water-cooling channel (10); the combustion chamber main body is connected with a flue gas channel connecting body (14) at the lower end through the same bolt (5); the smoke channel connecting body (14) is connected with a smoke channel, and the smoke channel is a hollow cylinder; the wall surface (19) of the flue gas channel and the wall surface (16) of the water cooling channel of the flue gas channel form a hollow water cooling channel (17) of the flue gas channel together.
2. A liquid fuel porous media burner with cold flame pre-evaporation as claimed in claim 1, characterized by: and the outer side of the wall surface (24) of the cold flame gasifier and the inner side of the combustion chamber shell (11) are respectively provided with a cold flame gasifier heat insulation layer (26) and a combustion chamber heat insulation layer (21).
3. A liquid fuel porous media burner with cold flame pre-evaporation as claimed in claim 1, characterized by: the cold flame vaporizer fixing ring (9) is of an annular structure, and vent holes are uniformly distributed on the annular wall around the central hole.
4. A liquid fuel porous media burner with cold flame pre-evaporation as claimed in claim 1, characterized by: the combustion chamber water-cooling channel (10) and the flue gas channel water-cooling channel (17) are connected through a cooling water drainage channel (15) on the flue gas channel connecting body (14), so that the cooling water flow is communicated, and the cross section of the cooling water drainage channel is circular.
5. A liquid fuel porous media burner with cold flame pre-evaporation as claimed in claim 1, characterized by: the wall surface (16) of the water-cooling passage of the flue gas passage and the wall surface (12) of the water-cooling passage of the combustion chamber are respectively provided with a cooling water inlet (18) and a cooling water outlet (8), and the cross sections of the cooling water inlet (18) and the cooling water outlet (8) are both circular.
6. A liquid fuel porous media burner with cold flame pre-evaporation as claimed in claim 1, characterized by: the flue gas channel wall surface (19) and the flue gas channel water-cooling channel wall surface (16) are fixedly connected through flue gas channel water-cooling channel supporting bodies (20) which are uniformly distributed in the circumferential direction.
7. A liquid fuel porous media burner with cold flame pre-evaporation as claimed in claim 1, characterized by: the combustion chamber shell (11) is fixedly connected with the wall surface (12) of the combustion chamber water-cooling channel through combustion chamber water-cooling channel supporting bodies (13) which are uniformly distributed in the circumferential direction.
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| CN202010734974.8A CN111853771B (en) | 2020-07-28 | 2020-07-28 | Liquid fuel porous medium combustor with cold flame pre-evaporation function |
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| CN202010734974.8A CN111853771B (en) | 2020-07-28 | 2020-07-28 | Liquid fuel porous medium combustor with cold flame pre-evaporation function |
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| CN111853771B true CN111853771B (en) | 2022-08-09 |
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