Heat supply combustion device using coal-based liquid fuel as fuel

Abstract

The invention discloses a heat supply combustion device taking coal-based liquid fuel as fuel, which comprises a combustion body, a porous ceramic silencing cylinder and a combustion cylinder, the combustion cylinder and the porous ceramic silencing cylinder are both in a conical shape with a small lower part and a large upper part, a fire distribution combustion cylinder is also arranged in the porous ceramic silencing cylinder, and the fire distribution combustion cylinder is arranged in the combustion body. Fire distribution holes are evenly formed in the periphery of the fire distribution combustion cylinder, the pipe wall of the combustion cylinder is sleeved with a heat preservation cover, and the space between the heat preservation cover and the outer wall of the combustion cylinder is filled with a fire-resistant heat preservation layer. Compared with the prior art, the porous ceramic silencing cylinder and the combustion cylinder are conical, so that the area of a fire outlet in the top of the combustion cylinder is increased, firepower dispersion is better, large-area heating of a to-be-heated part is more facilitated, liquid fuel can be combusted more sufficiently, and production and demolding of the porous ceramic silencing cylinder are easier; secondary combustion is carried out through the fire distribution combustion cylinder, complete vaporization combustion of the liquid fuel can be further promoted through cooperation with porous noise reduction ceramic, noise reduction and noise reduction are achieved, and the heat efficiency is higher.

Description

Technical Field

[0001] The invention relates to the field of heating equipment, and in particular to a heating combustion device using coal-based liquid fuel as fuel. Background Art

[0002] In the vast commercial stove market, most of them use liquefied gas fuel, such as gas cylinders, which are widely used in schools, troops, restaurants, hotels and other multi-person stove occasions. This traditional liquefied gas has problems such as low calorific value, high cost, low flash point, flammability and explosion, and great safety risks. Due to the great safety risks of liquefied gas fuel, the state's supervision is becoming more and more strict, and non-residential users are prohibited from using liquefied petroleum gas. As a result, commercial stove fuels have begun to turn to safe fuels with relatively high flash points---liquid fuels (coal-based liquid fuels). Among them, coal-based liquid fuel for kitchen stoves is a non-toxic, harmless, high flash point, liquid kitchen stove clean fuel with alkane as the main component, made from Fischer-Tropsch synthesis hydrocarbons, industrial white oil, high flash point hydrocarbon compounds, etc. as raw materials, compounded with high molecular oxygen-containing compounds and additives. The main advantages of this fuel oil are wide application, low price, high calorific value, good safety, clean and environmentally friendly, and it is very safe to burn at room temperature. The disadvantage is that the liquid fuel needs to be atomized or vaporized at high temperature to a certain particle size, and equipped with an induced draft fan to supply oxygen before it can be ignited and burned.

[0003] At present, liquid fuel stoves are mainly electric fuel stoves in terms of fuel supply. They are mainly used in a series of commercial high-fire stoves, Chinese stir-fry stoves, and large pot stoves. They are also used in other kitchen stoves such as steamers, stew barrels, cooking stoves, clay pot stoves, and heaters. A pulse oil pump is used to vaporize the fuel. The combustion method of the electric fuel stove must first pressurize the liquid fuel to 12 kilograms to ensure that the liquid fuel sprayed from the atomizing nozzle is in a mist form. The misted liquid fuel can be mixed with the air injected by the fan in the wind chamber of the stove to burn, and then a 20,000-volt voltage is generated through the ignition needle to ignite the mixed gas, realizing primary combustion in the wind chamber of the stove, and then released into the furnace basin after passing through the fire ring for secondary full combustion to achieve heating of the heated components. Since liquid fuel needs to be atomized through an atomizing nozzle under high pressure before it can be ignited, existing electric fuel injection stoves can only perform combustion and heating in medium or high fire mode, and cannot be heated over a low fire. Since the fuel supply is large during the high-pressure atomization process and the fuel is sprayed too quickly, it cannot be fully burned, resulting in a very low heat utilization rate of the electric fuel injection stoves currently on the market, so the heat utilization rate of electric 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 fuel. This product essentially changes the atomization combustion mode of the original electric fuel injection stove through the structural design of the ion combustion body, and changes the original open combustion mode of the electric fuel injection stove into a closed multi-stage combustion mode, and does not need to be atomized by a high-pressure atomizing nozzle. The temperature generated by the primary combustion in the first-stage combustion chamber in the ion combustion body is used in conjunction with the air intake of the cyclone intake cylinder to achieve true high-temperature vaporization of the liquid fuel and precise mixing of air and fuel ratios, and stably burns and fully vaporizes in the secondary combustion chamber formed between the lower ring of the combustion tube and the ion fire-dividing teeth, and fully burns and generates heat in the tertiary combustion chamber in the combustion tube, so that the liquid fuel is fully burned. The combustion device no longer directly heats the bottom of the heating component by flame, but after the fuel is fully burned in the combustion tube, the heating component is heated by heat radiation. Compared with direct flame heating, the heating effect is better, the heat utilization rate is greatly improved, and the heat energy loss is greatly reduced. Compared with the electric spray stove, the heat utilization rate is nearly doubled, and the energy consumption such as oil and electricity is only half of the original, and it is safer, independent, and widely applicable. In addition, when the low-fire mode is used for slow combustion, the liquid fuel can stably fission and burn on the ion fire-dividing teeth of the secondary combustion chamber, and continuously generate stable heat. However, this technology still has the following technical shortcomings: whether it is the first generation of liquid fuel stoves or the existing electric spray stoves, the combustion of liquid fuel must be blasted with air by a fan to assist combustion, which will generate noise. Therefore, when it is used on stoves such as household stoves and commercial stoves, its high noise is an unavoidable disadvantage.

[0005] In order to solve the noise problem, our company developed the second generation product based on the first generation product, see patent number CN20241 0633760.X, a multi-stage silent energy-saving combustion device for liquid fuel, which is designed with a porous ceramic silencer in the combustion tube. Compared with the first generation product, the porous ceramic is used to absorb and reduce the noise of the spiral rising combustion gas, and can further promote the vaporization and combustion of the liquid fuel. Moreover, after adding the porous ceramic silencer, the spiral rising combustion gas will release heat at the bottom of the ceramic silencer, spontaneously forming a vortex hot wind field, forming a natural secondary combustion chamber, and the subsequent liquid fuel is fully heated by the vortex hot wind field to vaporize and burn, changing the multi-stage combustion system of the liquid fuel. Therefore, in the second generation product, the secondary combustion chamber design between the lower ring of the combustion tube and the ion fire dividing tooth is cancelled, and the combustion tube and the porous ceramic silencer are redesigned. During operation, after the liquid fuel enters the combustion body, it is ignited and vaporized and burned in the first combustion chamber. The burning flame spirals up from the top of the ion combustion body, then enters the vortex hot air field of the second combustion chamber for secondary heating and fully vaporizes and burns, and finally enters the third combustion chamber on the upper part of the combustion tube for concentrated heat release, so that the liquid fuel is fully converted into thermal energy, and the thermal energy is ejected from the top of the silencer combustion tube in a large way of thermal radiation to heat the heating components, so that the thermal utilization rate of the entire combustion device is improved and the fuel consumption is further reduced. And with the improvement of the combustion effect of the combustion tube, the long cylindrical combustion tube design of the first generation product is cancelled, which reduces the restrictions on the size of the stove basin and the height of the stove body, and is more conducive to the installation design of small stoves such as household stoves.

[0006] Although this product has achieved open combustion of the stove body, it still has certain defects. Because in the open combustion process, the combustion tubes of the first two generations of products are also straight-tube structures, and the fire distribution effect of the straight-tube combustion tube is poor. In addition, the porous ceramics added in the second generation of products cannot be die-cast to ensure their porosity, and can only be cast. During the casting process, the porous ceramic silencer is brittle after molding, and the demolding effect of the straight-tube structure is poor. The two-stage porous ceramic demolding also results in a low yield rate. In addition, during the open combustion process, the outer wall of the combustion tube will heat up due to the high temperature, which can easily lead to heat loss to the outside, reducing its thermal utilization rate.

[0007] In addition, for the secondary combustion chamber, the first generation product uses the secondary combustion chamber between the lower ring of the combustion tube and the ion fire dividing teeth to perform secondary heating, vaporization and combustion on the primary vaporized combustion fuel. Since the ion fire dividing teeth will affect the spiral rising effect of the airflow, and the space height between the lower ring of the combustion tube and the ion fire dividing teeth is limited, and the temperature of this part is not very high, the effect of secondary vaporization and combustion is not very perfect. The secondary combustion chamber of the second generation product uses the vortex hot wind field naturally formed at the bottom of the porous ceramic silencer to achieve secondary heating, vaporization and combustion of the primary vaporized combustion fuel. The advantage is that the length of the combustion tube is reduced and the noise problem is solved. However, due to the cancellation of the design of the ion fire dividing teeth and the lower ring of the combustion tube, when the low-fire low-gear mode is turned on, due to the small amount of oil supply and low calorific value, it is easy to cause the liquid fuel to be unable to be completely vaporized and fully burned. Therefore, when the low-gear combustion occurs, there will be a peculiar smell and incompletely burned CO gas will be generated.

[0008] During the combustion process of the stove body, foreign objects or water stains may fall from the top and directly enter the first-stage combustion chamber, which will affect the ignition operation of the first-stage combustion chamber and even cause flameout. Therefore, our company further developed the third-generation product based on the previous one. Summary of the invention

[0009] The purpose of the present invention is to provide a heat supply combustion device which solves the above-mentioned problem and uses coal-based liquid fuel as fuel.

[0010] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a heating combustion device using coal-based liquid fuel as fuel, comprising a combustion body, a porous ceramic silencer and a combustion tube, wherein a first-stage combustion chamber is arranged in the combustion body, and the combustion tube and the porous ceramic silencer are both in the shape of a cone with a small bottom and a large top, and the porous ceramic silencer is placed in the combustion tube, and a conical air vent is vertically opened at the center of the porous ceramic silencer, and a fire-dividing combustion tube is also arranged in the air vent, and the lower end of the fire-dividing combustion tube is fixedly connected to the top of the combustion body, and fire-dividing holes are evenly opened around the fire-dividing combustion tube, and the fire-dividing holes are directly opposite to the middle and lower part of the porous ceramic silencer, and a second-stage combustion chamber is formed in the lower part of the combustion tube, and the upper part of the combustion tube is a third-stage combustion chamber, and a heat-insulating cover is provided on the outer wall of the tube of the combustion tube, and a refractory heat-insulating layer is filled between the heat-insulating cover and the outer wall of the combustion tube.

[0011] Preferably, the fire-dividing combustion tube consists of a fire-dividing tube, a sealing cover and a chassis, the fire-dividing holes are opened around the fire-dividing tube, the sealing cover is arranged at the top of the fire-dividing tube, the center of the chassis is a gradually narrowing shape, and the closing part of the chassis is fixedly connected to the bottom end of the fire-dividing tube.

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

[0013] Preferably, a fire-dividing fin is installed on the top of the combustion tube.

[0014] Preferably, a conical guide flare is processed between the top surface of the porous ceramic silencer and the air vent, and the guide flare is inclined to the outside of the fire-dividing fin.

[0015] Preferably, a cyclone air inlet is provided at the center of the combustion body, and a plurality of air outlets are vertically opened around the side walls of the cyclone air inlet, and a primary combustion chamber is formed between the cyclone air inlet and the inner wall of the combustion body. An impeller air inlet mechanism is provided at the bottom of the combustion body, and the impeller air inlet mechanism is connected to the interior of the cyclone air inlet. A ring-shaped vaporization combustion network is provided on the inner wall of the combustion body. The combustion body is also provided with an oil inlet connected to the oil inlet pipe and an ignition plug mounting hole, as well as a thermocouple probe for detecting the flameout state.

[0016] Preferably, it further includes a wind pressure box and an air inlet chamber, wherein the air inlet chamber is fixed to the bottom of the wind pressure box, the combustion body is installed on the upper surface of the wind pressure box, the impeller air intake mechanism is located in the wind pressure box, an induced draft fan is provided in the air inlet chamber, the air outlet of the induced draft fan is connected to the interior of the wind 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, pipeline holes are provided on the wind pressure box and the air inlet chamber for facilitating the entry and exit of pipelines. After assembly, the pipeline holes are sealed with sealing mud.

[0018] Preferably, a mounting flange plate is provided on the top of the heat-insulating cover, and a plurality of bolt mounting holes are opened on the mounting flange plate.

[0019] Preferably, flanges are provided at both upper and lower ends of the heat preservation cover, the upper flange is fixedly connected to the mounting flange plate by fastening bolts, and the lower flange is fixedly connected to the upper surface of the wind pressure box by fastening bolts.

[0020] Compared with the prior art, the advantages of the present invention are:

[0021] (1) The present invention designs the structure of the porous ceramic silencer and the combustion tube into a conical shape that is small at the bottom and large at the top, which can gradually increase the spiraling radius of the rising airflow, increase the area of ​​the fire outlet at the top of the combustion tube, better disperse the firepower, and be more conducive to heating a large area of ​​the heating component. At the same time, it can further extend the time for the airflow to pass through the ceramic silencer, reduce the wind speed of the airflow, achieve a good silencing and noise reduction effect, and the liquid fuel can also burn more fully. In addition, the ceramic silencer no longer needs to be designed in two stages, and the conical design also facilitates the demolding of the porous ceramic material after casting, which greatly improves the production yield of the porous ceramic silencer.

[0022] (2) Compared with the first generation product, the fire-dividing combustion tube designed by the present invention has a higher combustion height, and the vaporized liquid fuel has a large enough combustion space. Moreover, the temperature inside the combustion tube is much higher than that at the bottom. The fire-dividing combustion tube extends into the fire-dividing combustion tube, which is more conducive to the full vaporization and combustion of the liquid. Compared with the second generation product, the liquid fuel after vaporization and combustion in the first-level combustion chamber can pass through the fire-dividing combustion tube directly to the vicinity of the vortex hot wind field area at the bottom of the ceramic silencer. The high temperature environment in the combustion tube can ensure that the liquid fuel can reach full vaporization and combustion. Moreover, the fire-dividing combustion tube will not affect the liquid after vaporization in the first-level combustion chamber. The spiral rise in the combustion tube, combined with the porous silencer ceramic in the combustion tube, can further promote the complete vaporization and combustion of the liquid fuel and reduce noise. Therefore, compared with the first and second generation products, the present invention is more conducive to the vaporization and combustion of liquid fuel, and has a higher thermal efficiency.

[0023] (3) At the same time, the design of the fire-dividing combustion tube solves the problem that in the low-fire mode, the liquid fuel in the airflow is difficult to completely burn due to the small oil supply and low calorific value, so the ejected furnace gas has a peculiar smell, especially when the ignition operation is just started. Because the diameter of the fire-dividing combustion tube is much smaller than that of the combustion tube, when the liquid fuel after the first stage of vaporization is collected in the fire-dividing tube through the chassis, due to the reduction of 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 the complete vaporization and combustion of the liquid fuel under low oil supply conditions, which can effectively avoid the generation of peculiar smell of incomplete combustion.

[0024] (4) It combines all the advantages of the second-generation product and reduces the noise during operation. When this generation of products is turned on at a low fire, there is basically no sound and it is in a silent state. When the maximum air volume and oil intake are turned on, the noise is only 68 decibels, which is far lower than the standard of 85 decibels for liquid fuel stoves. This is a breakthrough solution to the problem of silencing and noise reduction of liquid fuel stoves that has existed for many years. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0026] Figure 2 It is a schematic diagram of the cross-sectional structure of AA of the present invention;

[0027] Figure 3 It is a schematic diagram of the three-dimensional structure of the present invention;

[0028] Figure 4 It is a schematic diagram of the bottom structure of the present invention;

[0029] Figure 5 It is a schematic diagram of the three-dimensional structure of the porous ceramic silencer of the present invention;

[0030] Figure 6 A schematic diagram of the three-dimensional structure of the fire-separated combustion tube of the present invention;

[0031] Figure 7 A schematic diagram of the bottom structure of the fire-dividing combustion tube of the present invention;

[0032] Figure 8 The schematic diagram of the assembly of the 5KW heating combustion device of the present invention when installed and used as a liquid gas stove.

[0033] In the figure: 1. Combustion tube; 2. Porous ceramic silencer; 21. Air vent; 22. Guide flare; 3. Fire-dividing combustion tube; 31. Fire-dividing tube; 32. Cover; 33. Chassis; 34. Fire-dividing hole; 35. Flanged edge; 36. Debris 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. Wind pressure box; 9. Air inlet chamber; 10. Fire-dividing wing; 11. Oil inlet pipe; 12. Draft fan; 13. Pipeline hole; 14. Dust net. DETAILED DESCRIPTION

[0034] The present invention is a further improvement on the second generation product. The original combustion body 4 structure adopted in its first-level combustion structure realizes spiral air intake through the impeller air intake mechanism 41 and the cyclone air intake cylinder 42. In conjunction with the vaporization combustion net in the first-level combustion chamber, the dispersed cracking of the liquid fuel can be realized so that the liquid fuel can reach the ignition and combustion conditions. The primary ignition operation can be carried out by feeding oil at a low oil volume. After the ignition is successful, the continuous vaporization and combustion of the liquid fuel can be realized by increasing the oil intake and cooperating with the high temperature generated by the primary ignition and combustion. Therefore, the vaporization conditions of the liquid combustion of our company's products are no longer atomized by a high-pressure nozzle. Due to the limitation of the high-pressure spray atomization conditions, our company's products can work in a low-grade small fire mode. Compared with the electrospraying method on the market, the first-level combustion structure of the present invention is a true high-temperature vaporization. Its liquid fuel molecules are smaller, more evenly distributed, and easier to burn. Compared with the electrospraying gas stove, the oil intake, power consumption, and ventilation volume are greatly reduced, and the thermal efficiency is also higher.

[0035] The present invention will be further described below, specifically as follows:

[0036] A heating combustion device using coal-based liquid fuel as fuel, see Figures 1 to 4 , including a combustion body 4, a porous ceramic silencer 2 and a combustion tube 1, wherein the combustion body 4 is provided with a primary combustion chamber, the combustion tube 1 and the porous ceramic silencer 2 are both in a conical shape with a small bottom and a large top, the porous ceramic silencer 2 is placed in the combustion tube 1, and a conical air vent 21 is vertically opened at the center of the porous ceramic silencer 2. The conical designs of the combustion tube 1, the porous ceramic silencer 2 and the air vent 21 are all conducive to the dispersion of the spiral rising airflow to the surroundings, thereby solving the problem of poor firepower distribution effect of the combustion tube 1.

[0037] Compared with the original straight-tube combustion tube 1 structure, the porous ceramic silencer 2 and the combustion tube 1 are designed to be a conical shape with a small bottom and a large top. Figure 5 , the spiral rising airflow can gradually increase the circling radius, increase the area of ​​the fire outlet at the top of the combustion tube 1, disperse the firepower better, and be more conducive to large-area heating of the heating component. At the same time, the time for the airflow to pass through the ceramic silencer can be further extended, the wind speed of the airflow can be reduced, and a good silencing and noise reduction effect can be achieved, and the liquid fuel can also be burned more fully. Moreover, compared with the combustion tube 1 of the second-generation product, the combustion tube 1 can be designed to be shorter, which is more conducive to installation, design and use on small household heating equipment. In addition, the ceramic silencer no longer needs to be designed in two stages, which is convenient for demolding the porous ceramic material after casting, greatly improving the production yield of the porous ceramic silencer 2.

[0038] In addition, the present invention adds a secondary combustion structure based on the second generation product, namely, the fire-dividing combustion tube 3, see Figure 6 and Figure 7 The specific scheme is as follows: a fire-dividing combustion tube 3 is also provided in the air vent 21 of the porous ceramic silencer 2. The lower end of the fire-dividing combustion tube 3 is fixedly connected to the top of the combustion body 4. Fire-dividing holes 34 are evenly arranged around the fire-dividing combustion tube 3. The fire-dividing holes 34 are directly opposite to the middle and lower part of the porous ceramic silencer 2, and a secondary combustion chamber is formed in the lower part of the combustion tube 1. The upper part of the combustion tube 1 is a tertiary combustion chamber. After the liquid fuel is vaporized and burned in the primary combustion chamber, it enters the fire-dividing combustion tube 3 for secondary combustion. The burning flame will be ejected from the fire-dividing holes 34 to achieve secondary combustion, ensuring sufficient vaporization and combustion of the liquid. It is also found that after the fire-dividing combustion tube 3 is installed above the primary combustion chamber, the temperature in the primary combustion chamber will be higher than before installation, which is more conducive to the ignition operation in the primary combustion chamber.

[0039] Compared with the first generation product, the fire-dividing combustion tube 3 designed in the present invention has a higher combustion height, the vaporized liquid fuel has a sufficiently large combustion space, and 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 full vaporization combustion of the liquid.

[0040] Compared with the second generation product, the liquid fuel after vaporization and combustion in the primary combustion chamber can directly reach the vortex hot wind field area near the lower part of the ceramic silencer through the fire-dividing combustion tube 3. The high temperature environment in the combustion tube 1 can ensure that the liquid fuel can reach full vaporization and combustion. In addition, the fire-dividing tube 31 is provided with fire-dividing holes 34 around it, and a cover 32 is provided on the top, so that the side direction of the fire-dividing tube 31 can be realized. Since the primary combustion chamber adopts a spiral air intake method, the fire-dividing tube 31 also sprays out in a spiral shape when it is out, which will not affect the vaporized liquid from spirally rising in the combustion tube 1. In combination with the porous silencer ceramics in the combustion tube 1, it can further promote the complete vaporization and combustion of the liquid fuel and reduce noise. Therefore, compared with the first and second generation products, the present invention is more conducive to the vaporization and combustion of liquid fuel, and its thermal efficiency is higher.

[0041] At the same time, the design of the fire-dividing combustion tube 3 solves the problem that in the low-fire mode, due to the small amount of oil supply and the low calorific value, the liquid fuel in the airflow is difficult to completely burn, so the ejected furnace gas has a peculiar smell, especially when the ignition operation is just started. Because the diameter of the fire-dividing combustion tube 3 is much smaller than that of the combustion tube 1, when the liquid fuel after the first stage of vaporization is collected in the fire-dividing cylinder 31 through the chassis 33, due to the reduction of the flow area, the vaporized liquid fuel will gather together to burn and generate heat, and the calorific value produced is sufficient to meet the conditions for the complete vaporization and combustion of the liquid fuel under the condition of low oil supply, which can effectively avoid the generation of peculiar smell of incomplete combustion.

[0042] The specific design scheme for the fire-dividing combustion tube 3 is as follows: the fire-dividing combustion tube 3 is composed of a fire-dividing tube 31, a cover 32 and a chassis 33. The fire-dividing holes 34 are arranged around the fire-dividing tube 31. The cover 32 is arranged at the top of the fire-dividing tube 31. The center of the chassis 33 is in a gradually contracting shape, and the closing part of the chassis 33 is fixedly connected to the bottom end of the fire-dividing tube 31. The chassis 33 is in a gradually contracting shape, which can well collect the spiral airflow generated by the lower primary combustion chamber without affecting the rotation direction of the airflow. After the liquid fuel is ignited and vaporized and burned in the primary combustion chamber, it enters the fire-dividing tube 31 with the spiral airflow, and performs secondary combustion in the fire-dividing tube 31. Since the fire-dividing tube 31 is vertically arranged on the chassis 33, it can extend into the combustion tube 1, and the high temperature at the lower part of the combustion tube 1 can promote the secondary vaporization and combustion of the liquid fuel.

[0043] The working principle of multi-stage combustion is as follows. Since the cavity of the first-stage combustion chamber is not very large and the temperature in the cavity is around 600°C, complete and sufficient combustion cannot be achieved during the liquid vaporization combustion process. A large amount of CO, combustible gas and oil vapor will be generated in the first-stage combustion chamber, and will enter the fire-dividing combustion tube 3 with the blown-in cyclone for secondary combustion. The completely burned liquid fuel burns and generates heat in the fire-dividing port in the form of flames, and a small amount of incompletely burned liquid fuel and oil vapor will enter the porous ceramic silencer 2 and gather at the bottom of the ceramic silencer for combustion, forming a vortex hot air field with heat-gathering effect at the bottom. The temperature of the hot air field is much higher than that of this part when the ceramic silencer is not installed. The temperature of the secondary combustion chamber reaches about 800°C. Since the liquid fuel is fully burned in the vortex hot air field, the heat generated by the combustion will be released in the tertiary combustion chamber. Therefore, a second thermal field will be formed in the tertiary combustion chamber with a temperature of about 1300°C, which can reheat the fuel to ensure its complete combustion and release the heat energy outward at the same time. The high-temperature heat energy released by the combustion is used to heat the components to be heated.

[0044] The structure of the fire-dividing combustion tube 3 is also optimized and designed. The top and bottom surfaces of the cover 32 are both arc-shaped surfaces. The arc-shaped structure of the arc-shaped top surface of the cover 32 can prevent debris or accidental water from falling from above the fire-dividing combustion tube 3 from entering the primary combustion chamber below the secondary fire-dividing combustion tube 3, affecting the ignition operation of the liquid fuel and causing flameout. The arc-shaped structure of the arc-shaped bottom surface of the cover 32 has a wind-guiding effect, which can guide the vertical airflow to the surrounding fire-dividing holes 34.

[0045] The chassis 33 is provided with an annular flange 35 around it, which can be used as a connection part and welded to the combustion body 4 below. At the same time, after the flange 35 is folded upward, an annular debris storage tank 36 can be formed between the flange 35 and the fire-distributing tube 31, which has a certain waterproof ability to prevent foreign matter such as impurities and water from entering the primary combustion chamber and affecting the combustion function. The debris can be cleaned regularly, and the water stains will evaporate at high temperature.

[0046] The top of the combustion tube 1 is provided with a fire-divider fin 10, which can evenly distribute the heat at the top outlet of the combustion tube 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 gather 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 of the top of the ceramic silencer will be too concentrated and cannot be completely dispersed to the surroundings of the fire-divider fin 10. In order to improve the fire-divider effect of the fire-divider fin 10, the present invention is processed with a conical guide expansion 22 between the top surface of the ceramic silencer and the vent 21. The guide expansion 22 can further increase the heat outlet area so that it can be dispersed to the surroundings of the fire-divider fin 10, so that the fire-divider fin 10 can evenly distribute the fire and achieve uniform heating of the parts to be heated. Through testing, as a preferred solution, the taper of the vent 21 and the outer wall of the porous ceramic silencer 2 is preferably 15-20°, the taper of the guide expansion 22 is 120-140°, and the height of the ceramic silencer is 50-100mm. At this time, the effect is best, which can ensure the fire concentration combustion effect in the combustion tube 1 and the range of the top air outlet is large enough.

[0047] In addition, since the liquid fuel of the present application is completely burned in the combustion tube 1, although the temperature of the outer wall of the combustion tube 1 is greatly reduced after the installation of the porous combustion ceramic silencer, the outer wall of the combustion tube 1 still has a certain temperature. In order to improve the heat utilization rate and avoid the loss of heat energy from the wall of the combustion tube 1, the present invention adds a ring-shaped insulation cover 5 outside the tube wall of the combustion tube 1, and designs a refractory insulation layer 6 between the insulation cover 5 and the combustion tube 1. The specific scheme is as follows: the tube wall of the combustion tube 1 is covered with an insulation cover 5, and the insulation cover 5 and the outer wall of the combustion tube 1 are filled with a refractory insulation layer 6. The outer wall of the combustion tube 1 is wrapped by the insulation cover 5 and the refractory insulation layer 6 to play a role in heat insulation, which can reduce the heat in the combustion tube 1 from being lost to the surrounding through the wall of the combustion tube 1, and can further improve its heat utilization rate. Moreover, after the heat insulation design is carried out, there is no need to worry about the high-temperature combustion tube 1 causing damage to the surrounding pipelines or equipment, and the temperature on the heat preservation cover 5 is not high, and the heating combustion device can also be installed with connecting components.

[0048] In order to complete the functions of the third-generation product, the present invention also improves the wind pressure box 8 and the air inlet chamber 9. The air inlet chamber 9 is fixed at the bottom of the wind pressure box 8, and the combustion body 4 is installed on the upper surface of the wind pressure box 8. The impeller air intake mechanism 41 is located in the wind pressure box 8. The air inlet chamber 9 is provided with an induced draft fan 12, and the air outlet of the induced draft fan 12 is connected to the inside of the wind pressure box 8. The wind pressure box 8 is a sealed box structure, which is used to carry the combustion body 4 and the combustion tube 1 at the upper end. At the same time, the wind pressure box 8 is pressurized by the induced draft fan 12 in the air inlet chamber 9, so that the impeller air intake mechanism 41 at the bottom of the combustion body 4 performs spiral air intake, thereby generating a spiral airflow in the first-level combustion chamber.

[0049] The air inlet chamber 9 is used as the installation room of the induced draft fan 12, and adopts a semi-enclosed structure. An air inlet is opened at the bottom of the air inlet chamber 9, and a dustproof net 14 is laid on the air inlet, which can effectively prevent dust 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 for easy access of pipelines. After assembly, the pipeline holes 13 are sealed with sealing mud.

[0050] In order to realize the installation of the entire gas supply and combustion device, a mounting flange plate 7 is also designed. The mounting flange plate 7 is fixed on the heat preservation cover 5. A plurality of bolt mounting holes are opened on the mounting flange plate 7. The mounting flange plate 7 is fixed to the equipment to be installed through the bolt mounting holes. At the same time, the heat preservation cover 5 serves as a connecting component. Flanges are provided at the upper and lower ends of the heat preservation cover 5. The flange at the upper end of the heat preservation cover 5 is fixedly connected to the mounting flange plate 7 by fastening bolts, and the flange at the lower end of the heat preservation cover 5 is fixedly connected to the upper surface of the wind pressure box 8 by fastening bolts. The heat supply and combustion device can be installed and used on relevant equipment through the heat preservation cover 5 and the mounting flange plate 7.

[0051] The structural principle of the combustion body 4 of the present invention refers to the first and second generation products developed by our company. A cyclone air inlet cylinder 42 is provided at the center of the combustion body 4. A plurality of air outlets are vertically opened around the side walls of the cyclone air inlet cylinder 42. A primary combustion chamber is formed between the cyclone air inlet cylinder 42 and the inner wall of the combustion body 4. An impeller air inlet mechanism 41 is provided at the bottom of the combustion body 4. The impeller air inlet mechanism 41 is connected to the interior of the cyclone air inlet cylinder 42. A ring-shaped vaporization combustion net is provided on the inner wall of the combustion body 4. An oil inlet port connected to the oil inlet pipe 11 and an ignition plug mounting hole are also provided on the combustion body 4. The vaporization combustion net can separate the liquid fuel sprayed from the oil inlet pipe 11, and a thermocouple probe is attached to the vaporization combustion net to realize primary combustion, as well as to detect the flameout state.

[0052] Comparative experiment: The electric fuel injection gas stove and the first and second generation products were used as control examples to conduct a comparative test with the experimental example of the present invention. 5 kg of water was added to four containers respectively, and the initial water temperature was measured to be 13°. The experimental example and the control example were turned on at the maximum fire at the same time.

[0053] Comparative example - existing electric fuel injection gas stove: using liquid fuel electric fuel injection stove to heat 5 kg of water from 13 ° to 97 ° boiling, it takes 4 minutes, the oil consumption is about 150 grams, and the heat utilization rate is about 22%;

[0054] Comparative example - first generation product: adopts multi-stage split energy-saving combustion device for heating, which takes 2 minutes and 40 seconds, consumes about 85 grams of fuel, and the heat utilization rate can reach about 45%.

[0055] Comparative example - second generation product: using the second generation multi-stage silent energy-saving combustion device for heating, it takes 2 minutes and 22 seconds, the fuel consumption is about 75 grams, and the heat utilization rate can reach about 50%.

[0056] Experimental Example - Invention: Using the third generation of heating combustion device for heating, it takes 2 minutes and 8 seconds, consumes about 70 grams of oil, and the heat utilization rate can reach about 53%.

[0057] Through the heating and combustion device of the present invention, corresponding models can be designed according to the application environment and used for various working environment needs, such as: a 100,000 kcal heating and combustion device can be used on the steam generator of a food processing plant. A 50,000 kcal heating and combustion device can be used on a small steam generator in a food processing plant. A 25,000 kcal heating and combustion device can be used in the field of commercial stoves. A 15,000 kcal heating and combustion device can be used in steam cabinets, rice cooking cabinets and other fields. A 5,000 kcal heating and combustion device can be used in clay pot rice, hot pot, water heaters and household fields. The 5KW heating and combustion device is installed and used as a liquid gas stove, see Figure 8 .

[0058] The above is a detailed introduction to a heating combustion device using coal-based liquid fuel as fuel provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope, and changes and improvements to the present invention will be possible without exceeding the concept and scope specified in the attached claims. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A heating combustion device using coal-based liquid fuel as fuel, comprising a combustion body, a porous ceramic muffler and a combustion cylinder, wherein the combustion body is provided with a primary combustion chamber, characterized in that: The combustion cylinder and the porous ceramic silencer are both in the shape of a cone with a small bottom and a large top. The porous ceramic silencer is placed in the combustion cylinder. A conical air vent is vertically opened at the center of the porous ceramic silencer. A fire-dividing combustion cylinder is also arranged in the air vent. The lower end of the fire-dividing combustion cylinder is fixedly connected to the top of the combustion body. Fire-dividing holes are evenly opened around the fire-dividing combustion cylinder. The fire-dividing holes are opposite to the middle and lower part of the porous ceramic silencer, and a secondary combustion chamber is formed in the lower part of the combustion cylinder. The upper part of the combustion cylinder is a tertiary combustion chamber. The tube wall of the combustion cylinder is sheathed with a heat-insulating cover, and a refractory heat-insulating layer is filled between the heat-insulating cover and the outer wall of the combustion cylinder.

2. A heat supply combustion device using coal-based liquid fuel as fuel according to claim 1, characterized in that: The fire-dividing combustion cylinder consists of a fire-dividing cylinder, a sealing cover and a chassis. The fire-dividing holes are opened around the fire-dividing cylinder. The sealing cover is arranged on the top of the fire-dividing cylinder. The center of the chassis is in a gradually narrowing shape. The closing part of the chassis is fixedly connected to the bottom end of the fire-dividing cylinder.

3. A heat supply combustion device using coal-based liquid fuel as fuel according to claim 2, characterized in that: The top and bottom surfaces of the cover are both arc-shaped surfaces, and the four sides of the chassis are folded upward to form an annular flange, which is welded and fixed to the top inner wall of the combustion body, and an annular debris storage tank is formed between the flange and the fire divider.

4. A heat supply combustion device using coal-based liquid fuel as fuel according to claim 1, characterized in that: The top of the combustion cylinder is provided with a fire dividing fin.

5. A heat supply combustion device using coal-based liquid fuel as fuel according to claim 4, characterized in that: A conical guide expansion opening is processed between the top surface of the porous ceramic silencer and the air vent, and the guide expansion opening is inclined toward the outer side of the fire-dividing fin.

6. A heat supply combustion device using coal-based liquid fuel as fuel according to claim 1, characterized in that: A cyclone air inlet cylinder is provided at the center of the combustion body, and a plurality of air outlets are vertically opened around the side walls of the cyclone air inlet cylinder. A primary combustion chamber is formed between the cyclone air inlet cylinder and the inner wall of the combustion body. An impeller air inlet mechanism is provided at the bottom of the combustion body, and the impeller air inlet mechanism is connected with the interior of the cyclone air inlet cylinder. A ring-shaped vaporization combustion network is provided on the inner wall of the combustion body. The combustion body is also provided with an oil inlet connected to the oil inlet pipe and an ignition plug mounting hole, as well as a thermocouple probe for detecting the flameout state.

7. A heat supply combustion device using coal-based liquid fuel as fuel according to claim 6, characterized in that: It also includes a wind pressure box and an air inlet chamber, the air inlet chamber is fixed to the bottom of the wind pressure box, the combustion body is installed on the upper surface of the wind pressure box, the impeller air intake mechanism is located in the wind pressure box, an induced draft fan is provided in the air inlet chamber, the air outlet of the induced draft fan is connected to the inside of the wind pressure box, an air inlet is opened at the bottom of the air inlet chamber, and a dustproof net is laid on the air inlet.

8. A heat supply combustion device using coal-based liquid fuel as fuel according to claim 7, characterized in that: The air pressure box and the air inlet chamber are provided with pipeline holes for facilitating the entry and exit of pipelines. After assembly, the pipeline holes are sealed with sealing mud.

9. A heat supply combustion device using coal-based liquid fuel as fuel according to claim 7, characterized in that: A mounting flange plate is provided on the top of the heat-insulating cover, and a plurality of bolt mounting holes are provided on the mounting flange plate.

10. A heat supply combustion device using coal-based liquid fuel as fuel according to claim 9, characterized in that: The upper and lower ends of the heat preservation cover are both provided with flanges, the upper flange is fixedly connected to the mounting flange plate by fastening bolts, and the lower flange is fixedly connected to the upper surface of the wind pressure box by fastening bolts.

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