Multi-stage scramjet device for liquid fuel

Abstract

The utility model discloses a multistage scramjet device for liquid fuel, which comprises a combustion body, a fire distribution combustion cylinder, a porous ceramic noise reduction cylinder and a combustion cylinder, the combustion cylinder and the porous ceramic noise reduction cylinder are in a conical shape with a small lower part and a large upper part, the center of the porous ceramic noise reduction cylinder is vertically provided with a vent hole, and the vent hole is communicated with the combustion body. Compared with the prior art, the porous ceramic silencing cylinder and the combustion cylinder are in a conical shape, so that the area of a fire outlet in the top of the combustion cylinder is increased, firepower dispersion is better, the combustion body is made to be in a conical shape, the combustion body is made to be in a conical shape, the combustion body is made to be in a conical shape, and the combustion body is made to be in a conical shape. Large-area heating of the to-be-heated part is facilitated, liquid fuel can be combusted more sufficiently, production and demolding of the porous ceramic silencing barrel are easier, secondary combustion is performed through the fire distribution combustion barrel, complete vaporization combustion of the liquid fuel can be further promoted in cooperation with porous silencing ceramic, noise reduction is achieved, and the heat efficiency is higher.

Description

Technical Field

[0001] This utility model relates to the field of liquid fuel stoves, and in particular to a multi-stage supercombustion device for liquid fuels. Background Technology

[0002] In the vast commercial stove market, liquefied petroleum gas (LPG) fuel, such as gas cylinders, is widely used in schools, military units, restaurants, hotels, and other multi-person stove applications. This traditional LPG has problems such as low calorific value, high cost, low flash point, flammability, explosiveness, and significant safety hazards. Due to the significant safety risks of LPG fuel, national monitoring has become increasingly strict, prohibiting non-residential users from using LPG. This has led to a shift in commercial stove fuels towards safer fuels with higher flash points—liquid fuels (coal-based liquid fuels). Coal-based liquid fuel for kitchen stoves is a non-toxic, harmless, high-flash-point liquid kitchen stove fuel mainly composed of alkanes, made from Fischer-Tropsch synthetic hydrocarbons, industrial white oil, high-flash-point hydrocarbon compounds, and other raw materials, compounded with high-molecular-weight oxygen-containing compounds and additives. Its main advantages are wide application, low price, high calorific value, good safety, and cleanliness; it is also very safe as it cannot burn at room temperature. The disadvantage is that the liquid fuel requires atomization or high-temperature vaporization to a certain particle size and the use of an induced draft fan to supply oxygen for ignition and combustion.

[0003] Currently, liquid fuel stoves are mainly electronically injected fuel stoves, primarily used in commercial high-powered stoves for Chinese cooking, such as woks and large pots. They are also used in other kitchen appliances such as steamers, braising pots, cooking ovens, clay pot stoves, and heaters. These stoves use a pulse fuel pump to vaporize the fuel. The combustion process in electronically injected fuel stoves requires the liquid fuel to be pressurized to 12 kg to ensure that the liquid fuel sprayed from the atomizing nozzle is in a mist form. This mist-like liquid fuel mixes with the air pumped in by the blower within the stove's air chamber for combustion. The mixture is then ignited by a 20,000-volt voltage generated by the ignition needle, achieving primary combustion within the stove's air chamber. After passing through the flame ring, the mixture is released into the burner pan for secondary combustion, ultimately heating the components to be heated. Because liquid fuels need to be atomized through an atomizing nozzle under high pressure before they can be ignited, existing electronic fuel injection stoves can only operate in medium to high heat mode and cannot operate in low heat mode. Due to the large fuel supply and rapid injection during high-pressure atomization, combustion is not complete, resulting in very low thermal efficiency of electronic fuel injection stoves on the market. Therefore, the thermal efficiency of electronic fuel injection stoves is mostly around 22%.

[0004] Therefore, our company developed the first generation of liquid fuel stoves, see patent number CN202410224133.0 A multi-stage split energy-saving combustion device for liquid fuels. This product, through the structural design of the ion burner, fundamentally changes the atomization combustion method of the original electronic fuel injection stove, transforming the open combustion method of the original electronic fuel injection stove into a closed multi-stage combustion method. It does not require atomization through a high-pressure atomizing nozzle. Utilizing the temperature generated by the primary combustion in the first-stage combustion chamber of the ion burner, combined with the air intake of the cyclone air intake, it achieves true high-temperature vaporization of liquid fuel and precise air-fuel ratio mixing. Stable combustion and full vaporization are achieved in the second-stage combustion chamber formed between the lower ring of the combustion cylinder and the ion fire-split teeth, and full combustion and heat generation are achieved in the third-stage combustion chamber within the combustion cylinder, ensuring complete combustion of the liquid fuel. This combustion device no longer directly heats the bottom of the heating element with a flame. Instead, the fuel is fully combusted inside the combustion chamber, and the heating element is heated by thermal radiation. Compared to direct flame heating, the heating effect is better, greatly improving heat utilization and reducing heat loss. Compared to electric injection stoves, the heat utilization rate is nearly doubled, and the energy consumption of oil and electricity is only half of the original. Moreover, it is safer, more independent, and has wider applicability. In low-fire mode, the liquid fuel can stably fission and burn on the ion-distribution teeth of the secondary combustion chamber, continuously generating stable heat. However, this technology still has the following shortcomings: regardless of the first-generation liquid fuel stove or the existing electric injection stove, the combustion of liquid fuel must be aided by a fan to blow air in, which generates noise. Therefore, when applied to household and commercial stoves, the high noise level is an unavoidable drawback.

[0005] To address the noise issue, our company developed a second-generation product based on the first-generation product. See patent number CN202410633760.X, "A Multi-Stage Silent Energy-Saving Combustion Device for Liquid Fuels." This device incorporates a porous ceramic silencer within the combustion chamber. Compared to the first-generation product, the porous ceramic absorbs and reduces noise from the spirally rising combustion gases, further promoting the vaporization and combustion of the liquid fuel. Furthermore, the addition of the porous ceramic silencer allows the spirally rising combustion gases to release heat at the bottom of the silencer, spontaneously forming a vortex hot air field, creating a natural secondary combustion chamber. This vortex hot air field fully heats the subsequently arriving liquid fuel, enabling its vaporization and combustion. This alters the multi-stage combustion system of the liquid fuel. Therefore, the second-generation product eliminates the secondary combustion chamber design between the lower ring of the combustion chamber and the ion-distributing flame teeth, and redesigns both the combustion chamber and the porous ceramic silencer. During operation, when liquid fuel enters the combustion chamber, it is ignited and vaporized in the primary combustion chamber. The flame rises spirally from above the combustion chamber and then enters the secondary combustion chamber's vortex hot air field for further heating and complete vaporization and combustion. Finally, it enters the tertiary combustion chamber at the top of the combustion cylinder for concentrated heat release. This process fully converts the liquid fuel into thermal energy, which is then emitted from the top of the silent combustion cylinder via thermal radiation to heat the components to be heated. This improves the overall thermal efficiency of the combustion device and further reduces fuel consumption. Furthermore, with the improved combustion effect of the combustion cylinder, the long cylindrical combustion cylinder design of the first-generation product has been eliminated, reducing limitations on the size of the burner and the height of the stove body, making it more suitable for the installation design of small stoves such as household stoves.

[0006] While this product achieves open combustion in the stove body, it still has certain drawbacks. In the open combustion process, the combustion chambers of the first two generations were also straight-tube structures, resulting in poor heat distribution. Furthermore, the porous ceramic added in the second generation could not be die-cast to ensure its porosity; it had to be cast. During casting, the porous ceramic silencer tube was brittle after molding, leading to poor demolding of the straight-tube structure. The two-stage demolding process also resulted in a low yield. Moreover, during open combustion, the outer wall of the combustion chamber heats up due to high temperatures, easily causing heat loss and reducing its thermal efficiency.

[0007] Furthermore, regarding the secondary combustion chamber, the first-generation product used a secondary combustion chamber located between the lower ring of the combustion chamber and the ion-distributing flame teeth to perform secondary heating, vaporization, and combustion of the fuel that had undergone primary vaporization. However, because the ion-distributing flame teeth affected the spiral upward airflow, and the space between the lower ring of the combustion chamber and the ion-distributing flame teeth was limited in height, and the temperature in this area was not very high, the secondary vaporization and combustion effect was not perfect. The second-generation product, on the other hand, utilizes a naturally formed vortex hot air field at the bottom of a porous ceramic muffler to achieve secondary heating, vaporization, and combustion of the fuel that had undergone primary vaporization. The advantages are a reduced combustion chamber length and a solution to the noise problem. However, because the ion-distributing flame teeth and the lower ring of the combustion chamber were eliminated, when the low-fire mode was activated, the low fuel supply and low calorific value made it easy for the liquid fuel to not be completely vaporized and fully combusted. This resulted in an unpleasant odor and the production of unburned CO gas during low-fire mode.

[0008] During the combustion process in the stove, foreign objects or water stains may fall from above. If these fall directly into the primary combustion chamber, they can affect the ignition process of the primary combustion chamber and may even cause the flame to go out. Therefore, our company has further developed the third-generation product based on our previous work. Utility Model Content

[0009] The purpose of this invention is to provide a multi-stage supercombustion device for liquid fuels that solves the above-mentioned problems.

[0010] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a multi-stage supercombustion device for liquid fuel, comprising a combustion body, a flame distribution combustion tube, a porous ceramic silencer tube, and a combustion tube. The combustion tube is vertically fixed to the flame outlet of the combustion body. The porous ceramic silencer tube and the flame distribution combustion tube are located inside the combustion tube. The combustion tube and the porous ceramic silencer tube are conical in shape, with a smaller bottom and a larger top. A vent is vertically opened at the center of the porous ceramic silencer tube. The flame distribution combustion tube is located inside the vent. The lower end of the flame distribution combustion tube is fixed to the top of the combustion body. Flame distribution holes are evenly opened around the flame distribution combustion tube.

[0011] Preferably, the flame distribution combustion tube includes a flame distribution tube, a cover, and a base. The flame distribution holes are opened around the flame distribution tube, the cover is welded to the top of the flame distribution tube, and the base is welded to the bottom of the flame distribution tube. The bottom surface of the base is tapered and connected to the inner wall of the flame distribution tube by a rounded transition.

[0012] Preferably, the top and bottom surfaces of the cover are both arc-shaped, the four sides of the chassis are folded upward to form an annular flange, the flange forms an annular debris storage groove between the chassis and the fire distribution tube, and the flange is welded and fixed to the top inner wall of the combustion body.

[0013] Preferably, the vent is a conical opening that is smaller at the bottom and larger at the top.

[0014] Preferably, the upper end of the combustion cylinder is equipped with a flame spreader, and a conical guide flare is machined between the top surface of the porous ceramic silencer and the vent.

[0015] Preferably, the device also includes a pressure box, the burner is mounted on the upper surface of the pressure box, and the bottom of the burner is provided with an impeller air intake mechanism located inside the pressure box.

[0016] Preferably, the system also includes an air inlet chamber, which is fixed to the bottom of the pressure box. The air inlet chamber is equipped with an induced draft fan, the outlet of which is connected to the inside of the pressure box. An air inlet is provided at the bottom of the air inlet chamber, and a dustproof net is laid on the air inlet.

[0017] Preferably, the pressure box and air inlet chamber are provided with pipeline holes to facilitate the entry and exit of pipelines. After assembly, the pipeline holes are sealed with sealing mud.

[0018] Preferably, the combustion cylinder is fitted with an insulation cover on its outer wall, and a fire-resistant insulation layer is filled between the insulation cover and the outer wall of the combustion cylinder.

[0019] Preferably, the top of the insulation cover is provided with a mounting flange plate, and the bottom of the insulation cover is fixedly connected to the air pressure box.

[0020] Compared with the prior art, the advantages of this utility model are:

[0021] (1) This utility model designs the porous ceramic silencer and combustion chamber into a conical shape with a smaller bottom and a larger top. This allows the spiraling airflow to gradually increase its vortex radius, increasing the area of ​​the flame outlet at the top of the combustion chamber, resulting in better heat dispersion and facilitating larger-area heating of the components to be heated. Simultaneously, it further extends the time the airflow spends passing through the ceramic silencer, reducing the airflow velocity and achieving excellent noise reduction. Liquid fuel can also burn more completely. Furthermore, the ceramic silencer no longer requires a two-section design, and the conical shape facilitates demolding of the porous ceramic material after casting, greatly improving the yield rate of porous ceramic silencer production.

[0022] (2) Compared to the first-generation product, the fire-dividing combustion tube of this invention has a higher combustion height, providing a sufficiently large combustion space for the vaporized liquid fuel. Furthermore, the temperature inside the combustion tube is much higher than at the bottom. The fire-dividing combustion tube extends into the combustion chamber, further facilitating the complete vaporization and combustion of the liquid fuel. Compared to the second-generation product, the liquid fuel vaporized and burned in the primary combustion chamber can directly reach the vicinity of the vortex hot air field area at the bottom of the ceramic silencer tube via the fire-dividing combustion tube. The high-temperature environment inside the combustion tube ensures that the liquid fuel achieves complete vaporization and combustion. Moreover, the fire-dividing combustion tube does not affect the spiral ascent of the vaporized liquid fuel within the combustion tube. Combined with the porous sound-absorbing ceramic inside the combustion tube, this further promotes the complete vaporization and combustion of the liquid fuel and reduces noise. Therefore, compared to the first and second-generation products, this invention is more conducive to the vaporization and combustion of liquid fuel, resulting in higher thermal efficiency.

[0023] (3) The design of the simultaneous distribution combustion tube solves the problem that in low-fire mode, when the oil supply is small and the calorific value is low, the liquid fuel in the gas flow is difficult to burn completely, resulting in an odor in the ejected furnace gas, especially when the ignition operation is just started. Because the diameter of the distribution combustion tube is much smaller than that of the combustion tube, when the liquid fuel after primary vaporization is collected in the distribution tube through the chassis, due to the reduction in the flow area, the vaporized liquid fuel will gather together to burn and generate heat. The calorific value produced is sufficient to meet the conditions for complete vaporization and combustion of liquid fuel under low oil supply conditions, which can effectively avoid the generation of odor from incomplete combustion.

[0024] (4) It combines the advantages of the second generation product and reduces the noise during operation. When the current generation product is turned on low flame, it is basically silent. When the maximum air volume and oil volume are turned on, the noise is only 68 decibels, which is far below the standard of 85 decibels for liquid fuel stoves. It has solved the problem of noise reduction of liquid fuel stoves that has been a problem for many years. Attached Figure Description

[0025] Figure 1 This is a front view of the present invention;

[0026] Figure 2 This is a cross-sectional structural diagram of the present utility model AA;

[0027] Figure 3 This is a three-dimensional structural diagram of the present invention;

[0028] Figure 4 This is a schematic diagram of the bottom structure of this utility model;

[0029] Figure 5 This is a three-dimensional structural diagram of the porous ceramic silencer of this utility model;

[0030] Figure 6A three-dimensional structural diagram of the flame distribution combustion tube of this utility model;

[0031] Figure 7 A schematic diagram of the bottom structure of the combustion chamber of this utility model;

[0032] Figure 8 This utility model presents an assembly diagram of a 5KW multi-stage supercombustion device for use in liquid gas stove installation.

[0033] In the diagram: 1. Combustion tube; 2. Porous ceramic silencer; 21. Vent; 22. Guide flare; 3. Flame distribution combustion tube; 31. Flame distribution tube; 32. Cover; 33. Chassis; 34. Flame distribution hole; 35. Flanged edge; 36. Waste storage tank; 4. Combustion body; 41. Impeller air intake mechanism; 42. Cyclone air intake tube; 5. Insulation cover; 6. Refractory insulation layer; 7. Mounting flange plate; 8. Air pressure box; 9. Air inlet chamber; 10. Flame distribution fin; 11. Oil inlet pipe; 12. Exhaust fan; 13. Pipeline hole; 14. Dustproof net. Detailed Implementation

[0034] The present invention will be further described below: A multi-stage supercombustion device for liquid fuels, see [link to relevant documentation]. Figures 1 to 7 The device includes a combustion body 4, a flame distribution combustion tube 3, a porous ceramic silencer tube 2, and a combustion tube 1. The combustion tube 1 is vertically fixed to the flame outlet of the combustion body 4. The porous ceramic silencer tube 2 and the flame distribution combustion tube 3 are located inside the combustion tube 1. The combustion tube 1 and the porous ceramic silencer tube 2 are conical in shape, with a smaller bottom and a larger top. A vent 21 is vertically opened at the center of the porous ceramic silencer tube. The conical design of the combustion tube 1 and the porous ceramic silencer tube 2 facilitates the dispersion of the spiraling airflow, solving the problem of poor heat distribution in the combustion tube 1. Compared with the original straight-tube combustion tube 1 structure, this invention designs the porous ceramic silencer tube 2 and the combustion tube 1 into a conical shape, which allows the spiraling airflow to gradually increase its vortex radius, increases the area of ​​the flame outlet at the top of the combustion tube 1, and improves heat distribution, making it more conducive to heating a large area of ​​the components to be heated. Simultaneously, it can further extend the time for airflow to pass through the ceramic silencer, reducing airflow velocity and achieving excellent noise reduction effects, while also allowing for more complete combustion of liquid fuel. Furthermore, the combustion cylinder 1 can be designed to be shorter than that of the second-generation product, making it more suitable for installation and use in small household heating equipment. In addition, the ceramic silencer no longer requires a two-section design, facilitating demolding of the porous ceramic material after casting, greatly improving the yield rate of the porous ceramic silencer 2 production.

[0035] Furthermore, based on the second-generation product, this utility model adds a two-stage combustion structure, namely a flame distribution combustion tube 3, with the specific scheme as follows: The flame distribution combustion tube 3 is located inside the vent 21, and the lower end of the flame distribution combustion tube 3 is fixed to the top of the combustion body 4. Flame distribution holes 34 are evenly distributed around the flame distribution combustion tube 3. The flame distribution combustion tube 3 includes a flame distribution tube 31, a cover 32, and a base 33. The flame distribution holes 34 are opened around the flame distribution tube 31, the cover 32 is welded to the top of the flame distribution tube 31, and the base 33 is welded to the bottom of the flame distribution tube 31. The bottom surface of the base 33 is tapered and connected to the inner wall of the flame distribution tube 31 with a rounded transition.

[0036] Compared to the first-generation product, the fire-dividing combustion tube 3 of this utility model has a higher combustion height, and the vaporized liquid fuel has a sufficiently large combustion space. Moreover, the temperature inside the combustion tube 1 is much higher than that at the bottom. The fire-dividing combustion tube 3 extends into the fire-dividing combustion tube 3, which is more conducive to the complete vaporization and combustion of the liquid.

[0037] Compared to the second-generation product, the liquid fuel, after vaporization and combustion in the primary combustion chamber, can directly reach the vicinity of the vortex hot air field area at the bottom of the ceramic silencer tube through the fire distribution combustion tube 3. The high-temperature environment within the combustion tube 1 ensures complete vaporization and combustion of the liquid fuel. Furthermore, the fire distribution tube 31 has fire distribution holes 34 around its perimeter and a cap 32 at its top, allowing for lateral flame and gas output. Since the primary combustion chamber uses a spiral air intake method, the gas output from the fire distribution tube 31 is also spiral-shaped, without affecting the spiral ascent of the vaporized liquid fuel within the combustion tube 1. Combined with the porous silencer ceramic within the combustion tube 1, this further promotes complete vaporization and combustion of the liquid fuel and reduces noise. Moreover, it was found that after the fire distribution combustion tube 3 is installed above the primary combustion chamber, the temperature within the primary combustion chamber is higher than before installation, which is more conducive to ignition within the primary combustion chamber. Therefore, compared to the first and second-generation products, this invention is more conducive to the vaporization and combustion of liquid fuel, resulting in higher thermal efficiency.

[0038] Meanwhile, the design of the fire distribution combustion tube 3 solves the problem of incomplete combustion of liquid fuel in the gas flow during low-fire mode, when the oil supply is small and the calorific value is low, resulting in an odor in the ejected furnace gas, especially during initial ignition operation. Because the diameter of the fire distribution combustion tube 3 is much smaller than that of the combustion tube 1, when the liquid fuel after primary vaporization is collected in the fire distribution tube 31 via the chassis 33, the reduced flow area causes the vaporized liquid fuel to gather together and burn, generating heat. The calorific value produced is sufficient to meet the conditions for complete vaporization and combustion of liquid fuel under low oil supply conditions, effectively avoiding the generation of odor from incomplete combustion.

[0039] The chassis 33 has a tapered shape, which can effectively collect the spiral airflow generated by the primary combustion chamber below without affecting the rotation direction of the airflow. After the liquid fuel is ignited and vaporized in the primary combustion chamber, it enters the fire distribution tube 31 with the spiral airflow and undergoes secondary combustion in the fire distribution tube 31. Since the fire distribution tube 31 is vertically set on the chassis 33, it can extend into the combustion tube 1 and promote the secondary vaporization and combustion of the liquid fuel through the high temperature at the bottom of the combustion tube 1.

[0040] The working principle of multi-stage combustion is as follows: Since the primary combustion chamber is not very large, and the internal temperature is around 600℃, complete combustion cannot be achieved during the liquid vaporization combustion process. A large amount of CO, combustible gas, and oil vapor are generated within the primary combustion chamber. These are then carried by the blown-in cyclone into the secondary combustion chamber 3 for secondary combustion. The completely burned liquid fuel burns and generates heat in the form of a flame at the ignition port. A small amount of incompletely burned liquid fuel and oil vapor enter the porous ceramic silencer 2 and accumulate at the bottom, forming a heat-gathering vortex of hot air below. The temperature of this hot air field is much higher than that of the area without the ceramic silencer. The temperature of the secondary combustion chamber is concentrated by the high-temperature infrared field in the hot air field, which also heats the secondary combustion chamber 3, ensuring the complete combustion of CO, combustible gas and oil vapor entering the secondary combustion chamber 3, greatly improving the heat utilization rate. The temperature of the secondary combustion chamber reaches about 800℃. Since the liquid fuel is fully combusted in the vortex hot air field, the heat generated by the combustion will be released in the tertiary combustion chamber. Therefore, a second hot field will be formed in the tertiary combustion chamber, with a temperature of about 1300℃, which can reheat the fuel to ensure its complete combustion, and at the same time release the heat energy to the outside. The high-temperature heat energy released by the combustion heats the components to be heated.

[0041] The structure of the secondary combustion chamber 3 has been optimized. Both the top and bottom surfaces of the cover 32 are arc-shaped. The arc-shaped top surface of the cover 32 prevents debris or accidental water spillage from entering the primary combustion chamber below the secondary combustion chamber 3, thus affecting the ignition of the liquid fuel and causing flameout. The arc-shaped bottom surface of the cover 32 acts as a guide, directing vertical airflow to the surrounding ignition holes 34. The vent 21 is a conical opening, smaller at the bottom and larger at the top, which facilitates the dispersion of airflow. The chassis 33 has annular flanges 35 around its perimeter, which can be welded to the lower combustion body 4 as a connection point. Simultaneously, the flanges 35, when folded upwards, form an annular debris storage tank 36 with the secondary combustion chamber 31, providing a certain degree of waterproofing and preventing impurities and water from entering the primary combustion chamber and affecting combustion. The debris can be cleaned periodically, while water will evaporate at high temperatures.

[0042] The combustion cylinder 1 is equipped with a flame distribution fin 10 at its top, which can evenly distribute the heat at the top outlet of the combustion cylinder 1. However, since the ceramic silencer has a certain thickness, the taper of the ceramic silencer and the vent 21 should not be too large. If the taper is too large, the space at the bottom of the ceramic silencer will be too large, and the liquid fuel cannot be concentrated for effective combustion, which is not conducive to the formation of the vortex hot air field. If the taper is too small, the heat coming out from the top of the ceramic silencer will be too concentrated and cannot be completely dispersed to the flame distribution fin 10 and its surroundings. In order to improve the flame distribution effect of the flame distribution fin 10, this utility model has a tapered guide flare 22 processed between the top surface of the ceramic silencer and the vent 21. The guide flare 22 can further increase the heat outlet area, so that it can be dispersed to the surroundings of the flame distribution fin 10, so that the flame distribution fin 10 can evenly distribute the flame and achieve uniform heating of the component to be heated. Through testing, as a preferred option, the taper of the vent 21 and the outer wall of the porous ceramic muffler 2 should be 15-85°, the taper of the guide flare 22 should be 100-175°, and the height of the ceramic muffler should be 50-100mm. At this point, the effect is optimal, which can ensure the concentrated combustion effect in the combustion tube 1 and also provide a sufficiently large range for the top vent.

[0043] Furthermore, since the liquid fuel of this application is completely burned inside the combustion cylinder 1, although the temperature of the outer wall of the combustion cylinder 1 is greatly reduced after the addition of the porous ceramic silencer pipe, the outer wall of the combustion cylinder 1 still has a certain temperature. In order to improve the heat utilization rate and prevent heat energy from being lost from the cylinder wall of the combustion cylinder 1, this utility model adds a ring-shaped heat insulation cover 5 to the outside of the tube wall of the combustion cylinder 1, and designs a fire-resistant heat insulation layer 6 between the heat insulation cover 5 and the combustion cylinder 1. The specific scheme is as follows: the heat insulation cover 5 is fitted on the outside of the tube wall of the combustion cylinder 1, and the fire-resistant heat insulation layer 6 is filled between the heat insulation cover 5 and the outer wall of the combustion cylinder 1. By wrapping the outer wall of the combustion cylinder 1 with the heat insulation cover 5 and the fire-resistant heat insulation layer 6, heat insulation can be achieved, which can reduce the heat loss from the combustion cylinder 1 to the surrounding area through the combustion cylinder 1 wall, and further improve its heat utilization rate. Moreover, with the heat insulation design, there is no need to worry about the high temperature of the combustion cylinder 1 causing damage to the surrounding pipelines or equipment. Furthermore, the temperature on the insulation cover 5 is not high, which also allows for the installation and connection of the multi-stage supercombustion device.

[0044] To complete the functions of the third-generation product, this utility model also improves the air pressure box 8 and the air inlet chamber 9. The air inlet chamber 9 is fixed to the bottom of the air pressure box 8, the burner 4 is installed on the upper surface of the air pressure box 8, the impeller air intake mechanism 41 is located inside the air pressure box 8, and the air inlet chamber 9 is equipped with an induced draft fan 12. The air outlet of the induced draft fan 12 is connected to the inside of the air pressure box 8. The air pressure box 8 is a sealed box structure, which serves to support the burner 4 and the combustion cylinder 1 at the top. At the same time, the induced draft fan 12 in the air inlet chamber 9 pressurizes the air pressure box 8, causing the impeller air intake mechanism 41 at the bottom of the burner 4 to perform spiral air intake, thereby generating a spiral airflow in the primary combustion chamber.

[0045] The air inlet chamber 9 serves as the installation chamber for the induced draft fan 12 and adopts a semi-enclosed structure. An air inlet is provided at the bottom of the air inlet chamber 9, and a dustproof net 14 is laid on the air inlet to effectively prevent dust and impurities in the air from entering the combustion body 4 through the induced draft fan 12 and affecting the combustion of liquid fuel. The air pressure box 8 and the air inlet chamber 9 are provided with pipeline holes 13 to facilitate the entry and exit of pipelines. After assembly, the pipeline holes 13 are sealed with sealing mud.

[0046] To facilitate the installation of the entire gas supply and combustion device, a mounting flange plate 7 is designed. The mounting flange plate 7 is fixed to the insulation cover 5. The mounting flange plate 7 has multiple bolt mounting holes, which are used to fix the mounting flange plate 7 to the panel of the equipment to be installed. Meanwhile, the insulation cover 5 serves as a connecting component, with flanges at both its upper and lower ends. The flange at the upper end of the insulation cover 5 is fixedly connected to the mounting flange plate 7 with fastening bolts, and the flange at the lower end of the insulation cover 5 is fixedly connected to the upper surface of the air pressure box 8 with fastening bolts. The multi-stage supercombustion device can be installed and used on relevant equipment through the insulation cover 5 and the mounting flange plate 7.

[0047] The structural principle of the combustor 4 of this utility model is described in the first and second generation combustors developed by our company. The combustor 4 has a cyclone air inlet 42 at its center. Several air outlets are vertically opened around the side wall of the cyclone air inlet 42. A primary combustion chamber is formed between the cyclone air inlet 42 and the inner side wall of the combustor 4. The bottom of the combustor 4 has an impeller air inlet mechanism 41, which is connected to the interior of the cyclone air inlet 42. A ring-shaped vaporization combustion mesh is provided on the inner side wall of the combustor 4. The combustor 4 also has an oil inlet connected to the oil inlet pipe 11 and an ignition plug mounting hole. The vaporization combustion mesh can separate the liquid fuel sprayed from the oil inlet pipe 11 and attach it to the vaporization combustion mesh to achieve primary combustion, as well as a thermocouple probe for detecting the flameout state.

[0048] Comparative Experiment: The electronically fuel-injected gas stove, as well as the first and second generation products, were used as control examples for comparison with the experimental example of this invention. Five kilograms of water were added to each of the four containers, and the initial water temperature was measured to be 13°C. Both the experimental and control examples were simultaneously turned on at maximum power.

[0049] Comparative example - Existing electric gas stove: Using a liquid fuel electric gas stove for heating, it takes 4 minutes to heat 5 kg of water from 13° to 97° boiling point, with an oil consumption of about 150 grams and a heat utilization rate of about 22%.

[0050] Comparative example - first-generation product: It adopts a multi-stage split energy-saving combustion device for heating, which takes 2 minutes and 40 seconds, consumes about 85 grams of oil, and has a heat utilization rate of about 45%.

[0051] Comparative Example - Second Generation Product: It adopts a second-generation multi-stage silent energy-saving combustion device for heating, which takes 2 minutes and 22 seconds, consumes about 75 grams of oil, and has a heat utilization rate of about 50%.

[0052] Experimental Example - Utility Model: Heating is performed using a third-generation multi-stage supercombustion device, which takes 2 minutes and 8 seconds, consumes about 70 grams of fuel, and achieves a heat utilization rate of about 53%.

[0053] This utility model's multi-stage super-combustion device allows for the design of corresponding models to suit various application environments. For example, a 100,000 kcal multi-stage super-combustion device can be used in steam generators in food processing plants; a 50,000 kcal multi-stage super-combustion device can be used in small steam generators in food processing plants; a 25,000 kcal multi-stage super-combustion device can be used in commercial stoves; a 15,000 kcal multi-stage super-combustion device can be used in steamers, rice cookers, etc.; and a 5,000 kcal multi-stage super-combustion device can be used in clay pot rice cookers, hot pots, water heaters, and household applications. For a 5kW multi-stage super-combustion device used in liquid gas stoves, see [link to documentation]. Figure 8 .

[0054] The above provides a detailed description of a multi-stage scramjet device for liquid fuels provided by this utility model. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, based on the idea of ​​this utility model, there will be changes in the specific implementation and application scope. Changes and improvements to this utility model are possible without exceeding the concept and scope specified in the appended claims. Therefore, the content of this specification should not be construed as a limitation of this utility model.

Claims

1. A multi-stage super-combustion apparatus for liquid fuel, characterized by: The utility model provides a kind of combustion body, combustion cylinder, porous ceramic muffler and combustion cylinder, the combustion cylinder is vertically fixed on the fire outlet of combustion body, the porous ceramic muffler and combustion cylinder are located in combustion cylinder, the combustion cylinder and porous ceramic muffler are in the shape of conical shape of small upper big, the center of the porous ceramic muffler is vertically provided with air vent, the combustion cylinder is located in air vent, the lower end of the combustion cylinder is fixed on the top of combustion body, and the combustion cylinder is evenly provided with combustion hole around.

2. A multi-stage super-knock device for liquid fuel as claimed in claim 1, wherein: The combustion cylinder includes combustion cylinder, cover and bottom plate, the combustion hole is provided around the combustion cylinder, the cover is welded on the top of combustion cylinder, and the bottom plate is welded on the bottom of combustion cylinder, the bottom surface of the bottom plate is in the shape of tapered closing, and is connected with the inner wall of combustion cylinder in circular arc.

3. A multi-stage super-knock device for liquid fuel as claimed in claim 2, wherein: The top surface and bottom surface of the cover are arc surfaces, the periphery of the bottom plate is folded upwards to form annular flange, the flange is connected with the bottom plate and combustion cylinder to form annular sundry storage tank, and the flange is welded and fixed with the inner side wall of the top of combustion body.

4. A multi-stage super-knock device for liquid fuel as claimed in claim 1, wherein: The air vent is in the shape of tapered opening.

5. A multi-stage super-knock device for liquid fuel as claimed in claim 1, wherein: The upper end of the combustion cylinder is provided with combustion fin, and the top surface of the porous ceramic muffler is processed with conical guide flange between air vent.

6. A multi-stage super-knock device for liquid fuel as claimed in claim 1, wherein: It also includes wind pressure box, the combustion body is installed on the upper surface of wind pressure box, the bottom of the combustion body is provided with impeller air inlet mechanism, and the impeller air inlet mechanism is located in wind pressure box.

7. A multi-stage super-kerosene apparatus for liquid fuel as claimed in claim 6 wherein: It also includes air inlet chamber, the air inlet chamber is fixed on the bottom of wind pressure box, the air inlet chamber is provided with air guide fan, the air outlet of the air guide fan is communicated with the inside of wind pressure box, the bottom of the air inlet chamber is provided with air inlet, and the air inlet is paved with dustproof net.

8. A multi-stage super-kerosene apparatus for liquid fuel as claimed in claim 7 wherein: The wind pressure box and air inlet chamber are provided with pipeline hole for pipeline, and the pipeline hole is sealed with sealing mud after assembly.

9. A multi-stage super-kerosene apparatus for liquid fuel as claimed in claim 6 wherein: The pipe wall of the combustion cylinder is sleeved with heat preservation cover, and the heat preservation cover is filled with refractory insulation layer between the outer wall of combustion cylinder.

10. A multi-stage super-kerosene apparatus for liquid fuel as claimed in claim 9 wherein: The top of the heat preservation cover is provided with mounting flange plate, and the bottom of the heat preservation cover is fixedly connected with wind pressure box.

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