CN111853771B - Liquid fuel porous medium combustor with cold flame pre-evaporation function - Google Patents

Abstract

The invention discloses a liquid fuel porous medium burner with cold flame pre-evaporation, which belongs to the field of micro-energy. The invention includes 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, and a combustion chamber thermal insulation layer. Porous medium in combustion section, porous medium in preheating section, cold flame gasifier, insulation layer of cold flame gasifier, air inlet and burner upper cover, etc. The liquid fuel porous media burner combines cold flame pre-evaporation and micro-combustion technology, which can improve the combustion efficiency of the burner, reduce pollutant emissions, and has a wide burner power adjustment range and combustion equivalence ratio range. Users only need to supply liquid fuel to the pressure swirl nozzle to obtain the energy generated by combustion, which has the advantages of environmental protection, high efficiency and portability. The present invention generates energy by pre-evaporating the liquid fuel and then burning it, and can be used as an energy source for micro-miniature equipment.

Description

A liquid fuel porous medium burner with cold flame pre-evaporation

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 capability, belonging to the field of micro-energy.

Background technique

With the development of science and technology, the processing technology of micro-devices has become more and more mature, and people are paying more and more attention to micro-devices. At the same time, using liquid fuel as an energy source has the advantages of easy storage and high energy density compared with general gas fuels. However, while the micro-devices are becoming more mature and the demand is expanding, new requirements are also put forward for the power supply equipment in them. Using the micro-combustion device as the energy source of the power supply device is one of the choices, and the micro-combustion device is also required to have a shape. Small size, low pollutant emissions, wide range of equivalence ratio of combustion and wide adjustable range of burner power.

The current traditional liquid fuel combustion technology is to inject liquid fuel into a high temperature combustion chamber, and use the high temperature of the combustion chamber to enhance the evaporation and premixing of the liquid fuel. However, because the evaporation and combustion processes of the liquid fuel cannot be well separated, it is not conducive to the liquid The premixed combustion of fuel and air inevitably results in insufficient combustion of liquid fuel, resulting in the problems of low energy density and high pollutant emission of the combustion device. In addition, solid particles from insufficient combustion of the liquid fuel are likely to clog the porous media, rendering the porous media burner ineffective. The present invention utilizes the cold flame reaction heat release of the liquid fuel, pre-evaporates the liquid fuel before the liquid fuel burns, separates the vaporization and combustion processes of the liquid fuel from each other, and improves the combustion efficiency of the burner. Therefore, it becomes very practical to invent a liquid fuel porous media burner with cold flame pre-evaporation.

SUMMARY OF THE INVENTION

In order to solve a series of problems such as high pollutant discharge and low energy density caused by the inability to separate liquid fuel evaporation and combustion process well in traditional liquid fuel combustion, the purpose of the present invention is to provide a liquid with cold flame pre-evaporation The fuel porous media burner uses liquid fuel as the combustion material, the energy density is significantly higher than that of the traditional micro liquid combustion device, and the pollutant emission is low. The liquid fuel can be supplied into the burner through the liquid inlet of the pressure swirl nozzle, and the combustion power of the burner can be adjusted by adjusting the oil supply pressure of the pressure swirl nozzle to provide energy to the outside world.

The purpose of the present invention is achieved through the following technical solutions.

The invention discloses a liquid fuel porous medium burner with cold flame pre-evaporation, comprising a pressure swirl nozzle, a nozzle swirl chamber liquid inlet, a swirl chamber, a nozzle outlet, a bolt, a washer, a nut, and a pressure swirl nozzle. liquid inlet. It also includes cooling water outlet, cold flame gasifier fixing ring, combustion chamber water cooling channel, combustion chamber shell, combustion chamber water cooling channel wall surface, combustion chamber water cooling channel support body, flue gas channel connecting body, cooling water drainage channel, flue gas Channel water cooling channel wall surface, flue gas channel water cooling channel, cooling water inlet, flue gas channel wall surface, flue gas channel water cooling channel support body, combustion chamber insulation layer, combustion section porous medium, preheating section porous medium, cold flame gasifier wall surface , Cold flame gasifier, cold flame gasifier insulation layer, air inlet, burner cover.

The pressure swirl nozzle includes two parts: the liquid fuel inlet at the upper end and the swirl injection at the lower end; the liquid fuel inlet part at the upper end is provided with a pressure swirl nozzle inlet, and the swirl injection part at the lower end is provided with a nozzle swirl chamber The liquid inlet, the swirl chamber and the nozzle outlet; the liquid fuel inlet at the upper end and the swirl jet at the lower end are connected to each other by threads, and the pressure swirl nozzle is then connected to the upper cover of the burner through threads; the upper cover of the burner is provided with There is a connection hole for the pressure swirl nozzle, and the inner thread for connecting the pressure swirl nozzle is arranged in the hole, and the air inlet is symmetrically arranged on the side of the upper cover of the burner; the upper cover of the burner is connected with the main part of the combustion chamber through the same bolt; The main part of the burner is a cylinder with a central passage, and a cold flame gasifier is arranged in the middle. The cold flame gasifier is fixed in the center of the main body of the combustion chamber through the cold flame gasifier fixing ring arranged up and down; the cold flame gasifier is the upper end. A cylindrical structure with an open end and a closed lower end; the cold flame gasifier is filled with porous media in the preheating section and porous media in the combustion section. The temperature of the gas is conducive to the subsequent combustion process to reduce pollutant emissions, and is conducive to the uniform combustion of the premixed gas; the porous medium in the combustion section is mainly used for the combustion of the premixed gas and flame stabilization, which has the advantages of reducing pollutant emissions and having a certain effect. It is beneficial to the 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 and the lower end of the flue gas channel connecting body are connected to each other by the same bolts; the flue gas channel The connecting body is connected with the flue gas channel, and the flue gas channel is a centrally connected cylinder; the wall surface of the flue gas channel and the wall surface of the water-cooling channel of the flue gas channel together form a hollow water-cooling channel of the flue gas channel.

The outer side of the cold flame gasifier wall surface and the inner side of the combustion chamber shell are respectively laid with a cold flame gasifier thermal insulation layer and a combustion chamber thermal insulation layer.

The cold flame gasifier fixing ring has an annular structure, and ventilation holes are evenly distributed around the central hole on the ring wall.

The water cooling channel of the combustion chamber and the water cooling channel of the flue gas channel are connected by the cooling water drainage channel on the flue gas channel connecting body to realize the penetration of the cooling water flow, and the cross section of the cooling water drainage channel is circular.

The cooling water inlet and the cooling water outlet are respectively provided on 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, and the cross-sectional shapes of the cooling water inlet and the cooling water outlet are both circular.

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 to the wall surface of the water cooling channel of the flue gas channel through the evenly distributed flue gas channel water cooling channel support body.

The combustion chamber casing is fixedly connected to the wall surface of the water cooling channel of the combustion chamber through the support body of the water cooling channel of the combustion chamber uniformly distributed in the circumferential direction.

Beneficial effects:

1. In order to solve a series of problems such as high pollutant discharge and low energy density caused by the inability to separate liquid fuel evaporation and combustion process well in traditional liquid fuel combustion, the present invention discloses a liquid with cold flame pre-evaporation. The fuel porous medium burner uses liquid fuel as the combustion material, and the energy density is significantly higher than that of the traditional micro liquid combustion device, and the pollutant emission is low, and the fuel addition is convenient. The liquid fuel can be supplied into the burner through the liquid inlet of the pressure swirl nozzle, and the combustion power of the burner can be adjusted by adjusting the oil supply pressure of the pressure swirl nozzle to provide energy to the outside world.

2. A liquid fuel porous medium burner with cold flame pre-evaporation disclosed in the present invention adopts the pre-evaporation scheme of pre-evaporating the liquid fuel by using the cold flame reaction heat release of the liquid fuel, which can improve the evaporation and combustion process of the liquid fuel. It is beneficial to the premixed combustion of fuel and air, thereby improving the combustion efficiency of the burner and broadening the adjustment range of the burner power.

3. A liquid fuel porous medium burner with cold flame pre-evaporation disclosed in the present invention adopts porous medium micro-combustion technology, which has the advantages of sufficient combustion, low heat loss and low emission of combustion pollutants. Porous medium combustion technology uses the regenerative characteristics of porous medium combustion technology to preheat the premixed gas, which greatly broadens the range of the burner's combustion equivalence ratio.

4. A liquid fuel porous medium burner with cold flame pre-evaporation disclosed in the present invention adopts the combination of water flow cooling and thermal insulation material to ensure the thermal strength of the burner, reduce the structural size of the burner, and control the burner to the outside world. It has the advantages of small heat loss, low temperature of the outer wall of the burner, which can effectively prevent personnel from being scalded and a good man-machine environment. In addition, pollutant emissions are reduced by the flue gas cooling channel.

5. A liquid fuel porous medium burner with cold flame pre-evaporation disclosed in the present invention, the liquid fuel can be supplied into the burner through the liquid inlet of the pressure swirl nozzle, and can be adjusted by adjusting the oil supply pressure of the pressure swirl nozzle The combustion power of the burner improves the utilization rate of energy.

Description of drawings

1 is a cross-sectional view of a liquid fuel porous media burner in an embodiment;

2 is a front cross-sectional view and a top view of a pressure swirl nozzle swirl injection portion of a liquid fuel porous media burner in a specific embodiment;

3 is a cross-sectional view along lines A-A, B-B and C-C of a liquid fuel porous media burner in a specific embodiment;

4 is a front view and a top view of a flue gas channel connecting body of a liquid fuel porous medium burner in a specific embodiment;

5 is a schematic diagram of a cold flame gasifier fixing ring of a liquid fuel porous media burner in a specific embodiment.

Among them, 1—pressure swirl nozzle, 2—nozzle swirl chamber inlet, 3—swirl chamber, 4—nozzle outlet, 5—bolt, 6—washer, 7—nut, 8—cooling water outlet, 9— Cold flame vaporizer fixing ring, 10—water cooling passage of combustion chamber, 11—combustion chamber shell, 12—wall surface of water cooling passage of combustion chamber, 13—support body of water cooling passage of combustion chamber, 14—connecting body of flue gas passage, 15—cooling Water drainage channel, 16—flue gas channel water cooling channel wall surface, 17—flue gas channel water cooling channel, 18—cooling water inlet, 19—flue gas channel wall surface, 20—flue gas channel water cooling channel support body, 21—combustion chamber insulation layer , 22—porous medium in combustion section, 23—porous medium in preheating section, 24—wall surface of cold flame gasifier, 25—cold flame gasifier, 26—cold flame gasifier insulation layer, 27—air inlet, 28— The upper cover of the burner, 29—the liquid inlet of the pressure swirl nozzle.

Detailed ways

In order to better illustrate the purpose and advantages of the present invention, the present invention will be further described below with reference to the drawings and specific embodiments.

Example 1

The liquid fuel porous medium burner of this embodiment uses liquid heptane as the fuel. As shown in FIG. 1 , the liquid heptane fuel is fed into the pressure swirl nozzle 1 through the pressure swirl nozzle liquid inlet 29, and then atomized and sprayed into the pressure swirl nozzle 1. For the combustion device, the power of the burner can be adjusted only by adjusting the fuel supply pressure of the pressure swirl nozzle 1 and then adjusting the fuel supply amount.

A liquid fuel porous medium burner with cold flame pre-evaporation disclosed in this embodiment, as shown in FIG. 1 , includes a pressure swirl nozzle 1 , a nozzle swirl chamber liquid inlet 2 , a swirl chamber 3 , and a nozzle outlet 4 , bolt 5, washer 6, nut 7, pressure swirl nozzle inlet 29. It also includes cooling water outlet 8, cold flame gasifier fixing ring 9, combustion chamber water cooling channel 10, combustion chamber shell 11, combustion chamber water cooling channel wall surface 12, combustion chamber water cooling channel support body 13, flue gas channel connecting body 14, Cooling water drainage channel 15, flue gas channel water cooling channel wall 16, flue gas channel water cooling channel 17, cooling water inlet 18, flue gas channel wall surface 19, flue gas channel water cooling channel support 20, combustion chamber insulation layer 21, combustion section porous Medium 22 , preheating section porous medium 23 , cold flame gasifier wall 24 , cold flame gasifier 25 , cold flame gasifier insulation layer 26 , air inlet 27 , burner upper cover 28 .

The pressure swirl nozzle 1 is made of 95Cr18 stainless steel, and the pressure swirl nozzle 1 includes a liquid fuel inlet part at the upper end and a swirl injection part at the lower end; The diameter of the liquid port is 14mm, and the swirl jet part at the lower end is provided with a nozzle swirl chamber liquid inlet 2, a swirl chamber 3 and a nozzle outlet 4, wherein the nozzle swirl chamber liquid inlet 2 has a diameter of 3mm and is evenly distributed in the circumferential direction. As shown in Figure 2, the diameter of the swirl chamber 3 is 16mm, and the diameter of the nozzle outlet 4 is 2mm; the liquid fuel inlet at the upper end and the swirl jet at the lower end are connected to each other by a screw pair with a nominal diameter of 36mm and a pitch of 1.5mm; The flow nozzle 1 is then connected to the burner upper cover 28 through a screw pair with a nominal diameter of 22 mm and a pitch of 1.5 mm; At the same time, two air inlets 27 are symmetrically arranged on the side of the burner upper cover 28, the diameter of the air inlets 27 is 3mm, and a fan can be arranged for adjusting the air flow; the burner upper cover 28 is connected to the combustion chamber through 4 M5 bolts The main part is connected; the main part of the burner is a cylinder with a middle pass, and a cold flame gasifier 25 is arranged in the middle. The inner diameter of the cold flame gasifier 25 is 25mm, the wall thickness is 2mm, and the length is 70mm. The cold flame gasifier 25 It is fixed to the center of the main body of the combustion chamber by two upper and lower cold flame gasifier fixing rings 9; the cold flame gasifier 25 is a cylindrical structure with an open upper end and a closed lower end; The medium 23 and the porous medium 22 in the combustion section, wherein the porous medium 23 in the preheating section is made of foamed alumina material with a pore size of 65ppi and a porosity of 84%, and the porous medium 22 in the combustion section is made of a foam-type oxide material with a pore size of 10ppi and a porosity of 87%. Made of aluminum material, the filling thickness of the two porous media is 75mm; the porous media 23 in the preheating section is used to preheat the incoming fuel air premixed gas, increase the temperature of the premixed gas, and help reduce the subsequent combustion process. Pollutant emission, and is conducive to the uniform combustion of premixed gas; the porous medium 22 in the combustion section is mainly used for premixed gas combustion and flame stabilization, and has the effect of reducing pollutant emissions and facilitating uniform combustion of premixed gas; The wall thickness of the combustion chamber shell 11 is 3 mm, and the thickness of the wall surface 12 of the combustion chamber water cooling passage is 2 mm; the cross section of the combustion chamber water cooling passage 10 is annular, the inner ring diameter is 45 mm, and the outer ring diameter is 53 mm. The body 11 is formed by connecting with the wall surface 12 of the water cooling passage of the combustion chamber; the main body of the combustion chamber and the connecting body 14 of the flue gas passage at the lower end are connected to each other by four M5 bolts. The converging channel, as shown in Figure 4; the flue gas channel connecting body 14 is connected with the flue gas channel, the flue gas channel is a cylinder with a middle pass, the diameter of the flue gas channel is 24mm, and the thickness of the wall surface 19 of the flue gas channel is 1mm; Gas channel wall surface 19 and flue gas channel water cooling channel wall surface 1 6. The water cooling channel 17 of the flue gas channel is formed together. The cross section of the water cooling channel 17 of the flue gas channel is annular, the diameter of the inner ring is 26mm, the diameter of the outer ring is 34mm, and the thickness of the wall surface 16 of the water cooling channel of the flue gas channel is 2mm. ; The burner components and structures mentioned above are in addition to the pressure swirl nozzle 1, the porous medium 23 in the preheating section, the porous medium 22 in the combustion section, the thermal insulation layer 21 of the combustion chamber, the thermal insulation layer 26 of the cold flame gasifier and the cold flame gasifier Except for the fixing ring 9, the rest of the burner components and structures are made of pressure vessel steel Q345R.

The cold flame gasifier thermal insulation layer 26 and the combustion chamber thermal insulation layer 21 are respectively laid on the outside of the cold flame gasifier wall 24 and the inside of the combustion chamber shell 11, wherein the cold flame gasifier thermal insulation layer 26 is laid with a thickness of 1 mm, and the combustion The thickness of the chamber insulation layer 21 is 1.5mm, and the materials are all made of silicon oxide aerogel insulation materials.

The cold flame vaporizer fixing ring 9 is a ring structure, as shown in FIG. 5 , there are ventilation holes evenly distributed around the central hole on the ring wall, made of high temperature resistant ceramic material, and the thickness of the fixing ring is 3mm.

The water-cooling channel 10 of the combustion chamber and the water-cooling channel 17 of the flue gas channel are connected by the cooling water drainage channel 15 on the flue gas channel connecting body 14 to realize the penetration of the cooling water flow. It is 3mm and the wall thickness is 1mm. The front view and top view of the flue gas channel connector are shown in Figure 4.

The cooling water inlet 18 and the cooling water outlet 8 are respectively provided on the wall surface 16 of the water cooling channel of the flue gas channel and the wall surface 12 of the water cooling channel of the combustion chamber. Both the cooling water inlet 18 and the cooling water outlet 8 have an inner diameter of 3 mm and a wall thickness of 1 mm.

The wall surface 19 of the flue gas channel and the wall surface 16 of the water-cooling channel of the flue gas channel are fixedly connected to the wall surface 16 of the water-cooling channel of the flue gas channel through 16 supports 20 of the water-cooling channel of the flue gas channel evenly distributed in the circumferential direction. 4mm spherical.

The combustion chamber shell 11 is fixedly connected to the wall surface of the water-cooled channel of the combustion chamber 12 through 12 support bodies 13 of the water-cooled channel of the combustion chamber that are evenly distributed in the circumferential direction, and the supporting bodies are all 4 mm in diameter. spherical.

The total length of the burner is 254 mm, the diameter of the cross section of the pressure swirl nozzle of the burner is 42 mm, and the maximum diameter of the cross section of the burner is 83 mm. The internal structure of the burner is shown in Figure 3.

The working method of a liquid fuel porous medium burner with cold flame pre-evaporation disclosed in this embodiment is as follows: supplying liquid heptane fuel to the pressure swirl nozzle liquid inlet 29 of the pressure swirl nozzle 1 of the burner, The heptane is rotated and broken through the swirl chamber 3 of the pressure swirl nozzle and then ejected through the nozzle outlet 4 to form fine droplets. Air enters the burner through the air inlet 27, where a fan may also be installed for air flow regulation. Then the heptane droplets and air enter the cold flame gasifier 25, and at the same time, the heat generated by the combustion in the combustion chamber is introduced into the cold flame gasifier through the cold flame gasifier insulation layer 26 and the cold flame gasifier wall surface 24, Make the temperature in the cold flame gasifier 25 reach the condition that the cold flame reaction of the liquid heptane fuel occurs, so that the cold flame reaction of the heptane occurs and releases heat so that the liquid heptane is completely evaporated, and the vaporized gaseous heptane refluxes simultaneously with the gaseous heptane. The air is fully pre-mixed into the porous medium area of the combustion chamber, and after being preheated and heated up by the porous medium 23 in the preheating section, it enters the porous medium 22 in the combustion section for combustion, and the flame is stabilized at the interface between the porous medium 23 in the preheating section and the porous medium 22 in the combustion section. Part of the heat released by the combustion is discharged from the flue gas through the flue gas channel, the other part of the heat enters the cold flame gasifier 25 for evaporating the liquid heptane fuel, and the rest of the heat enters the cooling water through the combustion chamber shell 11, and is replaced by the cooling water. Take it away to ensure that the temperature of the outer wall of the entire burner will not be too high to cause burns. When the burner needs to stop working, simply stop the fuel supply and air supply to stop the burner. In the start-up stage of the burner, since the small molecules and active radicals generated by the cold flame reaction of liquid heptane are easier to ignite, an external igniter is used to ignite the preheated burner at the outlet of the burner flue gas channel. A constant supply of liquid heptane burns the heptane fuel to release heat.

The above description further explains the purpose, technical solutions and advantages of the present invention. It should be understood that the above are only specific embodiments of the present invention, which are used to explain the present invention and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection 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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