Liquid burner and combustion method using direct current electric field to assist droplet evaporation

Abstract

A liquid combustor using direct current field to assist droplet evaporation, comprising an outer sleeve, an upper cover plate, a base, a fuel supply system, a direct current power supply, a combustion chamber, an evaporation chamber and a liquid cooling system; the bottom end of the outer sleeve is connected with the base, the top end of the outer sleeve is connected with the upper cover plate, the combustion chamber and the evaporation chamber are both located in the interior of the outer sleeve, the combustion chamber is located above the evaporation chamber, a combustion mesh plate is arranged between the combustion chamber and the evaporation chamber, a metal electrode plate is installed at the lower end of the evaporation chamber, the positive and negative poles of the direct current power supply are connected with the metal electrode plate and the combustion mesh plate respectively, the fuel supply system comprises a fuel pipe for conveying fuel, the outlet of the fuel pipe is directed towards the metal electrode plate; the liquid cooling system is installed on the base. The application also relates to a combustion method, which uses the above combustor, and can use the synergistic effect of electric field and temperature field to regulate the droplet evaporation rate to make the droplet evaporate and vaporize, solves the problems of uncontrollable evaporation rate and low fuel utilization rate in the prior art, and belongs to the technical field of micro fuel droplet evaporation combustion.

Description

Technical Field

[0001] This invention relates to the field of micro fuel droplet evaporation and combustion technology, specifically to a liquid burner and combustion method that utilizes a DC electric field to assist droplet evaporation. Background Technology

[0002] Liquid fuels, due to their high energy density, can be effectively matched with power equipment and are widely used in the engine field. However, the emissions of combustion products contradict current international energy conservation and emission reduction policies. To address this issue, researchers have proposed advanced engine technologies such as advanced turbocharging, high-pressure injection, and optimized combustion. However, changes in the engine's in-cylinder environment can have uncontrollable effects on the fuel evaporation process. As the core of energy utilization, designing novel burners with advantages of environmental protection, safe operation, and controllability has always been a research hotspot.

[0003] The evaporation rate of fuel droplets and their morphological changes during evaporation have a significant impact on combustion characteristics. However, in micro-scale burners, the fuel evaporation space is limited, the evaporation rate is uncontrollable, and the fuel cannot completely evaporate within this confined space. This leads to problems such as low fuel utilization, insufficient waste heat utilization, and excessive emissions in the exhaust gas. Therefore, in order to precisely control the droplet evaporation rate and improve combustion efficiency, it is necessary to design a novel liquid burner for micro-burners using liquid fuels, enabling it to meet the requirements of controllable liquid fuel evaporation rate and full utilization of exhaust gas waste heat. Summary of the Invention

[0004] To address the technical problems existing in the prior art, the purpose of this invention is to provide a liquid burner and combustion method that utilizes a DC electric field to assist in the evaporation of liquid droplets, which has a controllable evaporation rate and high combustion efficiency.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a liquid burner utilizing a DC electric field to assist droplet evaporation, comprising an outer sleeve, a top cover plate, a base, a fuel supply system, a DC power supply, a combustion chamber, an evaporation chamber, and a liquid cooling system; the bottom end of the outer sleeve is connected to the base, and the top end of the outer sleeve is connected to the top cover plate; both the combustion chamber and the evaporation chamber are located inside the outer sleeve, with the combustion chamber located above the evaporation chamber; a combustion mesh plate is installed between the combustion chamber and the evaporation chamber; a metal electrode plate is installed at the lower end of the evaporation chamber; the positive and negative terminals of the DC power supply are respectively connected to the metal electrode plate and the combustion mesh plate; the fuel supply system includes a fuel pipe for conveying fuel, with the outlet of the fuel pipe facing the metal electrode plate; the liquid cooling system is installed on the base, and includes a liquid cooling plate, a fluid inlet, and a fluid outlet; a liquid cooling channel is provided inside the liquid cooling plate, connecting the fluid inlet and the fluid outlet; the evaporation chamber is located above the liquid cooling plate.

[0006] With this structure, the liquid cooling system is used to regulate the temperature of the evaporation chamber. The metal electrode plate is connected to the positive terminal of the DC power supply to form an electric field in the evaporation chamber. In this way, the evaporation rate of the droplets can be regulated by the synergistic effect of the electric field and the temperature field, so that the droplets can be vaporized. This can effectively solve the problems of uncontrollable evaporation rate and low fuel utilization rate in the existing technology.

[0007] As a preferred embodiment, a liquid burner utilizing a DC electric field to assist droplet evaporation further includes a heat transfer sleeve and an air connector. The heat transfer sleeve is located inside the outer sleeve, with its bottom end connected to a base. Both the combustion chamber and the evaporation chamber are located inside the heat transfer sleeve. A flue gas flow channel is provided between the outer side of the heat transfer sleeve and the outer sleeve, and an air flow channel is provided between the inner side of the heat transfer sleeve and the combustion chamber and the evaporation chamber. The evaporation chamber has an air inlet, and the air connector passes through the outer sleeve and connects to the inner side of the heat transfer sleeve. The air connector is connected to the air inlet via the air flow channel. The outer sleeve has an exhaust port, and the upper end of the combustion chamber is open. The upper end of the combustion chamber is connected to the exhaust port via the flue gas flow channel.

[0008] As a preferred embodiment, the fuel supply system also includes a fuel tank and a fuel supply pump. The fuel tank is fixed to the upper surface of the upper cover plate, and the fuel supply pump is used to drive the fuel to be delivered to the fuel pipe. The fuel pipe includes a fuel delivery pipe, a fuel conduit, and a conical conduit. The fuel tank, fuel delivery pipe, fuel conduit, and conical conduit are connected in sequence. The fuel conduit passes through the outer sleeve, the heat transfer sleeve, and the evaporation chamber. The outlet of the conical conduit is conical and the conical conduit is vertically downward toward the metal electrode plate.

[0009] As a preferred option, the walls of the evaporation chamber, the walls of the combustion chamber, and the outer casing are all made of transparent material.

[0010] As a preferred embodiment, the walls of the evaporation chamber and the combustion chamber are respectively evaporation sleeves and combustion sleeves. The evaporation sleeves are cylindrical, and there are four air inlets, which are evenly arranged radially on the evaporation sleeves.

[0011] As a preferred option, the combustion mesh plate is a porous metal dielectric electrode plate.

[0012] As a preferred embodiment, the liquid cooling system also includes a mounting base, a liquid cooling cover plate, and two liquid cooling connecting pipes. The mounting base is bonded to the base and has a groove. The liquid cooling plate is located in the groove. The liquid cooling channel is formed by an S-shaped channel groove at the upper end of the liquid cooling plate. The upper end of the liquid cooling plate is sealed by the liquid cooling cover plate. The two liquid cooling connecting pipes are respectively connected to the fluid inlet and the fluid outlet. The liquid cooling connecting pipes pass through the outer sleeve, the heat transfer sleeve, and the mounting base.

[0013] As a preferred embodiment, a liquid burner that utilizes a DC electric field to assist droplet evaporation further includes an insulating plate disposed between the upper end of the mounting base and the metal electrode plate, with a liquid-cooled cover plate located below the insulating plate. Both the insulating plate and the mounting base are made of bakelite.

[0014] As a preferred embodiment, a liquid burner that utilizes a DC electric field to assist droplet evaporation also includes an igniter, the igniter's lead being connected to an external power source, and the igniter being located above the combustion grid plate.

[0015] A combustion method employs a liquid burner that utilizes a DC electric field to assist in droplet evaporation. The liquid cooling system, fuel supply pump, and DC power supply are activated. Fluid flows within the liquid cooling channel, and its temperature is controlled by an external water bath. Liquid fuel is pumped into a conical conduit and compressed, causing one or more drops to drip from the bottom of the conical conduit onto a metal electrode plate. The fuel supply pump is then stopped, and the fuel supply ceases. Under pressure, the liquid in the fuel pipe stops flowing out, and the droplets evaporate on the metal electrode plate, forming fuel vapor. Air flows into the air channel through an air connector and is heated by heat transferred from the exhaust gas. The air then enters the evaporation chamber along the air channel and mixes thoroughly with the fuel vapor. The mixture is ignited by an igniter on the combustion grid plate and burns completely in the combustion chamber. The resulting exhaust gas is discharged from the exhaust port through the flue gas channel.

[0016] In summary, the present invention has the following advantages:

[0017] 1. This invention incorporates a liquid cooling system. Fluid enters through a liquid-cooled connecting pipe at the fluid inlet and exits through the same pipe at the fluid outlet. The fluid temperature is controlled by a water bath heating method. An external liquid supply system is used to adjust the fluid temperature and flow rate to maintain the temperature within the evaporation chamber within a reasonable range. An electric field is created within the evaporation chamber by connecting metal electrode plates to the positive and negative terminals of a high-voltage power supply and a porous metal dielectric electrode plate. This electric field environment is used to regulate the droplet morphology and internal flow state. The combined effect of the electric field and temperature field is used to regulate the droplet evaporation rate and enhance droplet evaporation.

[0018] 2. In this invention, the fuel supply pump is tightly fitted to the upper cover plate, the fuel tank is fixed on the fuel supply pump, and one end of the fuel delivery pipe is connected to the fuel tank. The fuel supply pump draws liquid fuel into the conical guide tube for compression, causing one or several drops of liquid fuel to drip from the bottom of the conical guide tube onto the metal electrode plate. Then the fuel supply pump is stopped, and the liquid fuel injection stops. Under pressure, the liquid in the fuel pipe no longer flows out. The volume and number of fuel droplets can be precisely adjusted. Since the fuel supply system is arranged at the top of the device and fits tightly, the size of the burner can be effectively reduced.

[0019] 3. The air inlet of the present invention is arranged on the wall of the evaporation chamber, which can improve the mixing degree of fuel vapor and air. At the same time, the air carries the vapor to the combustion chamber, avoiding the accumulation of vapor around the droplets and reducing the evaporation rate. The porous metal medium makes the mixed gas evenly distributed on the combustion mesh plate. The fuel and air mixture is ignited by the igniter, so that the fuel vapor can be completely burned. At the same time, the combustion mesh plate also plays a role in stabilizing combustion. The exhaust gas of combustion transfers heat to the air through the heat transfer sleeve, preheating the air and thus further improving the fuel utilization rate.

[0020] 4. The outer sleeve, heat transfer sleeve, evaporation sleeve and combustion sleeve of the present invention are all made of transparent materials, which is more conducive to observing the droplet evaporation process and the steam combustion process. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the internal structure of the present invention;

[0022] Figure 2 for Figure 1 A schematic diagram of the structure in the AA direction;

[0023] Figure 3 for Figure 1 A schematic diagram of the structure in the BB direction.

[0024] Among them, 1 is the fuel tank, 2 is the fuel delivery pipe, 3 is the fuel supply pump, 4 is the fuel conduit, 5 is the conical conduit, 6 is the liquid cooling plate, 7 is the liquid cooling connection pipe, 8 is the liquid cooling cover plate, 9 is the liquid cooling flow channel, 10 is the mounting base, 11 is the base, 12 is the outer sleeve, 13 is the exhaust port, 14 is the upper cover plate, 15 is the heat transfer sleeve, 16 is the air connection pipe, 17 is the evaporation sleeve, 18 is the air inlet, 19 is the metal electrode plate, 20 is the metal porous medium electrode plate, 21 is the insulating plate, 22 is the combustion sleeve, 23 is the igniter, 24 is the lead wire, 25 is the DC power supply, 26 is the evaporation chamber, 27 is the combustion chamber, 28 is the flue gas flow channel, and 29 is the air flow channel. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0026] Example 1

[0027] like Figures 1-3As shown, a liquid burner utilizing a DC electric field to assist droplet evaporation includes an outer sleeve 12, an upper cover plate 14, a base 11, a fuel supply system, a DC power supply 25, a combustion chamber 27, an evaporation chamber 26, and a liquid cooling system. The bottom end of the outer sleeve 12 is connected to the base 11, and the top end of the outer sleeve 12 is connected to the upper cover plate 14. Both the combustion chamber 27 and the evaporation chamber 26 are located inside the outer sleeve 12, with the combustion chamber 27 positioned above the evaporation chamber 26. A combustion mesh plate is installed between the combustion chamber 27 and the evaporation chamber 26. A metal electrode plate 19 is installed at the lower end of the evaporation chamber 26. The positive and negative terminals of the DC power supply 25 are connected to the metal electrode plate 19 and the combustion mesh plate, respectively. The fuel supply system includes a fuel pipe for conveying fuel, and the outlet of the fuel pipe faces the metal electrode plate 19. The liquid cooling system is installed on the base 11. The liquid cooling system includes a liquid cooling plate 6, a fluid inlet and a fluid outlet. The liquid cooling plate 6 is provided with a liquid cooling channel 9, which connects the fluid inlet and the fluid outlet. The evaporation chamber 26 is located above the liquid cooling plate 6.

[0028] A liquid burner that utilizes a DC electric field to assist droplet evaporation further includes a heat transfer sleeve 15 and an air connector 16. The heat transfer sleeve 15 is located inside the outer sleeve 12, and the bottom end of the heat transfer sleeve 15 is connected to the base 11. The combustion chamber 27 and the evaporation chamber 26 are both located inside the heat transfer sleeve 15. A flue gas flow channel 28 is provided between the outer side of the heat transfer sleeve 15 and the outer sleeve 12, and an air flow channel 29 is provided between the inner side of the heat transfer sleeve 15 and the combustion chamber 27 and the evaporation chamber 26. The evaporation chamber 26 has an air inlet 18. The air connector 16 passes through the outer sleeve 12 and connects to the inner side of the heat transfer sleeve 15. The air connector 16 is connected to the air inlet 18 via the air flow channel 29. The outer sleeve 12 has an exhaust port 13. The upper end of the combustion chamber 27 is open, and the upper end of the combustion chamber 27 is connected to the exhaust port 13 via the flue gas flow channel 28.

[0029] The combustion mesh plate is a porous metal dielectric electrode plate 20. The DC power supply 25 is a high-voltage DC power supply.

[0030] The inner side of the upper end of the heat transfer sleeve 15 is sealed with an annular cover plate to ensure that air does not leak and mix with the flue gas. The outer side of the heat transfer sleeve 15 is the flue gas flow channel 28, through which the flue gas generated by combustion flows. The inner side of the heat transfer sleeve 15 is the air flow channel 29, through which air flows into the air flow channel 29 from the air connector 16. The heat transfer sleeve 15 is made of transparent insulating material to facilitate heat transfer between the flue gas side and the air side and to observe the evaporation and combustion of droplets. The lower end of the heat transfer sleeve 15 is sealed to the base 11 to prevent gas leakage.

[0031] The lower end of the combustion chamber 27 and the upper end of the evaporation chamber 26 are sealed to the edge of the porous metal electrode plate 20 to prevent steam and flue gas leakage. The two chambers are connected through the pores of the porous medium. Preheated air flows into the lower end of the evaporation chamber 26, and the preheated air mixes thoroughly with the steam before flowing into the combustion chamber 27. The mixture is ignited by the igniter 23 to produce exhaust gas, which is discharged from the exhaust port 13 through the flue gas passage 28. The metal electrode plate 19 is arranged parallel to the porous metal electrode plate 20, with a certain distance between them. Turning on the DC power supply 25 creates an electrostatic field between the porous metal electrode plate 20 and the metal electrode plate 19. The droplets undergo morphological changes under the influence of the electrostatic field. By adjusting the electric field strength and activating the liquid cooling system, the temperature inside the evaporation chamber 26 reaches the evaporation requirement. The synergistic effect of the electric and temperature fields helps control the fuel droplet evaporation rate and improve combustion efficiency.

[0032] The fuel supply system also includes a fuel tank 1 and a fuel supply pump 3. The fuel tank 1 is fixed to the upper surface of the upper cover plate 14. The fuel supply pump 3 is used to drive the fuel to be delivered to the fuel pipe. The fuel pipe includes a fuel delivery pipe 2, a fuel conduit 4 and a conical conduit 5. The fuel tank 1, the fuel delivery pipe 2, the fuel conduit 4 and the conical conduit 5 are connected in sequence. The fuel conduit 4 passes through the outer sleeve 12, the heat transfer sleeve 15 and the evaporation chamber 26. The outlet of the conical conduit 5 is conical and the conical conduit 5 is vertically downward toward the metal electrode plate 19.

[0033] The conical conduit 5 is vertically distributed at the center of the evaporation chamber 26. The fuel supply pump 3 controls the volume and number of fuel droplets. Small droplets fall from the conical conduit 5 onto the metal electrode plate 19. The shape of the small droplets changes under the action of the electrostatic field. At the same time, the liquid cooling system changes the temperature distribution of the evaporation chamber. Under the combined action of the electric field and the temperature field, the small droplets are vaporized into fuel vapor and mixed with air and flow to the porous medium electrode plate 20, where they burn on the upper surface of the porous medium electrode plate.

[0034] The walls of the evaporation chamber 26, the walls of the combustion chamber 27, and the outer sleeve 12 are all made of transparent material.

[0035] The walls of the evaporation chamber 26 and the combustion chamber 27 are respectively the evaporation sleeve 17 and the combustion sleeve 22. The evaporation sleeve 17 is cylindrical and has four air inlets 18, which are evenly arranged radially on the evaporation sleeve 17.

[0036] The liquid cooling system also includes a mounting base 10, a liquid cooling cover plate 8, and two liquid cooling connecting pipes 7. The mounting base 10 is bonded to the base 11 and has a groove. The liquid cooling plate 6 is located in the groove. The liquid cooling channel 9 is formed by an S-shaped channel groove at the upper end of the liquid cooling plate 6. The upper end of the liquid cooling plate 6 is sealed by the liquid cooling cover plate 8. The two liquid cooling connecting pipes 7 are connected to the fluid inlet and the fluid outlet, respectively. The liquid cooling connecting pipes 7 pass through the outer sleeve 12, the heat transfer sleeve 15, and the mounting base 10.

[0037] The liquid cooling plate 6 is placed in the mounting base 10 and fits tightly, which can effectively improve the heat preservation effect and transfer the heat of the liquid cooling plate 6 upward to the evaporation chamber 26. The S-shaped distribution of the flow channels inside the liquid cooling plate 6 can effectively improve the temperature uniformity of the surface of the liquid cooling plate 6 and ensure that the temperature distribution of the evaporation chamber 26 is uniform. The mounting base 10 is sealed with an insulating plate 21 to ensure that the charge is not transferred to the liquid inside the liquid cooling plate and to ensure charge conservation. The metal electrode plate 19 is tightly fitted with the insulating plate 21 to ensure that the heat of the liquid cooling plate 6 can be completely transferred to the evaporation chamber 26, changing the temperature of the fluid inside the liquid cooling plate, thereby controlling the temperature distribution of the evaporation chamber 26, improving the droplet evaporation efficiency, and achieving the purpose of controllable evaporation rate. At the same time, the connection between the metal electrode plate 19 and the evaporation sleeve 17 is sealed to prevent fuel leakage.

[0038] A liquid burner that utilizes a DC electric field to assist droplet evaporation also includes an insulating plate 21, which is disposed between the upper end of the mounting base 10 and the metal electrode plate 19. A liquid-cooled cover plate 8 is located below the insulating plate 21. Both the insulating plate 21 and the mounting base 10 are made of bakelite.

[0039] A liquid burner that utilizes a DC electric field to assist droplet evaporation also includes an igniter 23, whose lead 24 is connected to an external power source, and the igniter 23 is located above the combustion grid plate.

[0040] The igniter 23 is located near the combustion screen, with a small gap between the igniter 23 and the combustion screen. The igniter 23 facilitates ignition and makes the burner easier to use.

[0041] Specifically:

[0042] The burner base 11 is circular with a diameter of 100 mm and a height of 10 mm. It is made of silicon carbide material with low thermal conductivity and insulation. The upper cover plate 14 is also made of silicon carbide material with low thermal conductivity and insulation. It has a diameter of 92 mm and a thickness of 2 mm. A small hole with a diameter of 1 mm is opened 24 mm from the center for leading out the lead wire 24 of the igniter 23 to connect to the power supply.

[0043] The outer diameter of the fuel delivery pipe 2 of this burner is 0.6 mm and the inner diameter is 0.5 mm. The outer diameter of the fuel conduit 4 is 0.5 mm and the inner diameter is 0.4 mm.

[0044] The burner outer sleeve 12 is made of high-temperature resistant transparent glass with high thermal conductivity and insulation. It has an outer diameter of 46mm, a wall thickness of 2mm, and a height of 70mm. Four 6mm diameter through holes are evenly opened radially at a distance of 55mm from the bottom of the outer sleeve for the installation of the air pipe 16. A 1mm diameter through hole is opened at a distance of 42mm from the bottom for the fuel conduit 4. Two 5mm diameter through holes are symmetrically opened radially at a distance of 13mm from the bottom for the installation of the liquid cooling connection pipe 7. Four exhaust ports are evenly opened radially at a distance of 5mm from the bottom for exhaust gas discharge. The choice of transparent glass material facilitates the observation of fuel evaporation and combustion. A small hole with a diameter of 1mm is opened at a distance of 22mm and 47mm from the bottom for the lead wire between the electrode plate and the DC power supply 25 to extend.

[0045] The heat transfer sleeve 15 has an outer diameter of 36mm, a wall thickness of 2mm, and a height of 63mm. It is made of high-temperature resistant transparent glass with high thermal conductivity and insulation. The top is sealed with a 2mm thick, 36mm outer diameter, and 26mm inner diameter ring to isolate air from flue gas. Four 6mm diameter through holes are evenly opened radially at 55mm from the bottom, and four air pipes 16 with an outer diameter of 3mm and an inner diameter of 2.5mm are installed for air introduction. Two 5mm diameter through holes are symmetrically opened radially at 13mm from the bottom for the installation of liquid cooling connection pipes 7. A 1mm diameter small hole is opened at 22mm and 47mm from the bottom for the lead wire between the electrode plate and the DC power supply to extend.

[0046] A liquid cooling system is coaxially mounted on the base 11. The mounting base 10 has a diameter of 56 mm and a height of 20 mm. A groove with a diameter of 50 mm and a depth of 12 mm is carved in the center for mounting the liquid cooling plate 6. Two through holes are symmetrically distributed on the side, 13 mm from the bottom, for connecting the liquid cooling connection pipe 7. The liquid cooling plate 6 has a diameter of 50 mm and a height of 8 mm. A cover plate 8 with a thickness of 2 mm and a diameter of 50 mm is installed on top. An S-shaped flow channel with a width of 3 mm is opened inside the liquid cooling plate 6, allowing for 6 circulation passes. An insulating plate 21 with a diameter of 56 mm and a thickness of 1 mm is installed on the upper end of the mounting base 10. The insulating plate 21 is an insulating glass cover plate used for heat transfer between the liquid cooling plate 6 and the evaporation chamber 26, and also serves as insulation.

[0047] A metal electrode plate 19, 56 mm in diameter and 1 mm thick, made of stainless steel, is tightly attached to the insulating plate 21. A lead wire extends from the metal electrode plate 19, passes through the lead wire hole on the heat transfer sleeve 15 and the outer sleeve 12, and is connected to the positive terminal of the DC power supply 25. An evaporation sleeve 17, with an outer diameter of 28 mm, an inner diameter of 26 mm, and a height of 25 mm, is sealed and installed on the metal electrode plate 19. This sleeve is made of high-temperature resistant insulating glass. Four air inlets 18, each 4 mm in diameter, are evenly opened radially at a distance of 5 mm from the bottom. Preheated air is evenly introduced into the evaporation chamber 26 through the four air inlets 18. A small hole with a diameter of 1 mm is opened at a distance of 20 mm from the bottom for the insertion of the fuel conduit 4.

[0048] A 1mm thick, 56mm diameter porous metal electrode plate 20 is sealed and installed at the upper end of the evaporator sleeve 17. A lead wire is led out from the porous metal electrode plate 20, passes through the lead wire hole on the heat transfer sleeve 15 and the outer sleeve 12, and is connected to the negative terminal of the DC power supply 25. A combustion sleeve 22 with an outer diameter of 28mm, an inner diameter of 26mm, and a height of 15mm is sealed and installed on the porous metal electrode plate 20. The combustion sleeve 22 is a high-temperature resistant insulating glass sleeve. An evaporation chamber 26 is formed between the metal electrode plate 19, the evaporator sleeve 17, and the porous metal electrode plate 20. A combustion chamber 27 is formed between the porous metal electrode plate 20 and the combustion sleeve 22. An air flow channel 28 is formed between the outer side of the evaporator sleeve 17 and the combustion sleeve 22 and the inner side of the heat transfer sleeve 15.

[0049] A combustion method employs a liquid burner that utilizes a DC electric field to assist in droplet evaporation. The liquid cooling system, fuel supply pump 3, and DC power supply 25 are activated. Fluid flows within the liquid cooling channel 9, and its temperature is controlled by an external water bath. Liquid fuel is pumped into a conical conduit 5 by the fuel supply pump 3 and compressed, causing one or more drops to fall from the bottom of the conical conduit 5 onto the metal electrode plate 19. The fuel supply pump 3 is then stopped, and the liquid fuel supply ceases. Under pressure, the liquid in the fuel pipe no longer flows out, and the droplets evaporate on the metal electrode plate 19, forming fuel vapor. Air flows into the air channel 29 through the air connector 16 and is heated by heat transferred from the exhaust gas. The air then enters the evaporation chamber 26 along the air channel 29 and mixes thoroughly with the fuel vapor. The mixed gas is ignited by the igniter 23 on the combustion grid plate and fully combusted in the combustion chamber 27. The resulting exhaust gas is discharged from the exhaust port 13 through the flue gas channel 28.

[0050] The fluid temperature inside the liquid cooling plate 6 can be controlled by an external liquid supply system, which uses existing water bath heating methods, such as a constant temperature water bath.

[0051] This burner has advantages such as compact structure, synergistic effect of electric and temperature fields, controllable evaporation rate, visual observation of droplet evaporation and combustion, high thermal efficiency of exhaust gas preheating air, and increased combustion efficiency by increasing the residence time of the combustion gas in the combustion chamber. It has broad application prospects.

[0052] The above embodiments are preferred embodiments of the invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A liquid burner that utilizes a direct current electric field to assist in the evaporation of liquid droplets, characterized in that: It includes an outer sleeve, an upper cover plate, a base, a fuel supply system, a DC power supply, a combustion chamber, an evaporation chamber, and a liquid cooling system; The bottom end of the outer sleeve is connected to the base, and the top end of the outer sleeve is connected to the top cover plate. The combustion chamber and the evaporation chamber are both located inside the outer sleeve, with the combustion chamber located above the evaporation chamber. A combustion mesh plate is installed between the combustion chamber and the evaporation chamber. A metal electrode plate is installed at the lower end of the evaporation chamber. The positive and negative terminals of the DC power supply are connected to the metal electrode plate and the combustion mesh plate, respectively. The fuel supply system includes a fuel pipe for conveying fuel, with the outlet of the fuel pipe facing the metal electrode plate. The liquid cooling system is installed on the base and includes a liquid cooling plate, a fluid inlet and a fluid outlet. The liquid cooling plate has a liquid cooling channel that connects the fluid inlet and the fluid outlet. The evaporation chamber is located above the liquid cooling plate.

2. A liquid burner using a DC electric field to assist droplet evaporation according to claim 1, characterized in that: It also includes a heat transfer sleeve and an air pipe. The heat transfer sleeve is located inside the outer sleeve. The bottom end of the heat transfer sleeve is connected to the base. The combustion chamber and the evaporation chamber are both located inside the heat transfer sleeve. A flue gas flow channel is left between the outer side of the heat transfer sleeve and the outer sleeve. An air flow channel is left between the inner side of the heat transfer sleeve and the combustion chamber and the evaporation chamber. The evaporation chamber has an air inlet, and the air pipe passes through the outer sleeve and connects to the inside of the heat transfer sleeve. The air pipe is connected to the air inlet via the air flow channel. The outer sleeve has an exhaust port. The upper end of the combustion chamber is open, and the upper end of the combustion chamber is connected to the exhaust port via the flue gas flow channel.

3. A liquid burner using a DC electric field to assist droplet evaporation according to claim 2, characterized in that: The fuel supply system also includes a fuel tank and a fuel supply pump. The fuel tank is fixed to the upper surface of the upper cover plate, and the fuel supply pump is used to drive the fuel to be delivered to the fuel pipe. The fuel pipe includes a fuel delivery pipe, a fuel conduit, and a conical conduit. The fuel tank, fuel delivery pipe, fuel conduit, and conical conduit are connected in sequence. The fuel conduit passes through the outer sleeve, the heat transfer sleeve, and the evaporation chamber. The outlet of the conical conduit is conical and points vertically downward toward the metal electrode plate.

4. A liquid burner using a DC electric field to assist droplet evaporation according to claim 3, characterized in that: The walls of the evaporator chamber, the combustion chamber, and the outer casing are all made of transparent material.

5. A liquid burner using a DC electric field to assist droplet evaporation according to claim 3, characterized in that: The walls of the evaporation chamber and the combustion chamber are respectively evaporation sleeves and combustion sleeves. The evaporation sleeve is cylindrical and has four air inlets, which are evenly arranged radially on the evaporation sleeve.

6. A liquid burner using a DC electric field to assist droplet evaporation according to claim 3, characterized in that: The combustion mesh plate is a porous metal dielectric electrode plate.

7. A liquid burner using a DC electric field to assist droplet evaporation according to claim 3, characterized in that: The liquid cooling system also includes a mounting base, a liquid cooling cover plate, and two liquid cooling connecting pipes. The mounting base is bonded to the base and has a groove. The liquid cooling plate is located in the groove. The liquid cooling flow channel is formed by an S-shaped flow channel groove opened at the upper end of the liquid cooling plate. The upper end of the liquid cooling plate is sealed by the liquid cooling cover plate. The two liquid cooling connecting pipes are connected to the fluid inlet and the fluid outlet, respectively. The liquid cooling connecting pipes pass through the outer sleeve, the heat transfer sleeve, and the mounting base.

8. A liquid burner using a DC electric field to assist droplet evaporation according to claim 7, characterized in that: It also includes an insulating plate, which is placed between the upper end of the mounting base and the metal electrode plate. A liquid-cooled cover plate is located below the insulating plate. Both the insulating plate and the mounting base are made of bakelite.

9. A liquid burner using a DC electric field to assist droplet evaporation according to claim 3, characterized in that: It also includes an igniter, whose lead wires are connected to an external power source, and the igniter is located above the combustion grille.

10. A combustion method employing a liquid burner using a DC electric field-assisted droplet evaporation as described in any one of claims 3 to 9, characterized in that: Turn on the liquid cooling system, fuel supply pump and DC power supply. The fluid in the liquid cooling system flows in the liquid cooling channel. The temperature of the fluid is controlled by heating with an external water bath. The liquid fuel is pumped into the conical tube by the fuel supply pump and squeezed so that one or several drops of liquid fuel drip from the bottom of the conical tube onto the metal electrode plate. Then the fuel supply pump is stopped and the liquid fuel is stopped. Under pressure, the liquid in the fuel tube no longer flows out. The droplets evaporate on the metal electrode plate to form fuel vapor. Air flows into the air channel through the air connector and is heated by the heat transferred from the exhaust gas. The air enters the evaporation chamber along the air channel and mixes thoroughly with the fuel vapor. The mixed gas is ignited by the igniter on the combustion screen and burns completely in the combustion chamber. The exhaust gas produced is discharged from the exhaust port through the flue gas channel.

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