Hydrogen-doped gas combustion device

Abstract

The hydrogen-doped gas combustion device comprises a positioning ring, an inner ring cover and an outer ring cover, an installation ring hole is formed in the middle of the positioning ring, the inner ring cover is inserted into the inner side of the installation ring hole in a matched mode, the inner ring cover comprises an inner ring plane end and a first side wall end, and a plurality of sets of first fire holes are formed in the first side wall end in a circumferential array mode. The outer ring cover is arranged on the outer ring side wall of the positioning ring in a matched mode and comprises second fire holes formed in the surface of the outer ring cover. The fuel gas stove has the beneficial effects that the combustion efficiency of the fuel gas stove is improved, and the risk of flame backfire caused by high flame propagation speed of hydrogen during premixed combustion and the phenomena of red flame and yellow flame caused by insufficient combustion are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of hydrogen-blended fuel gas combustion, in particular to a hydrogen-blended or pure hydrogen combustion device. Background Art

[0002] At present, natural gas is still the main fuel used in the stove field, so the combustion characteristics of natural gas are mainly considered in the design of the stove head. The stove head fire hole mainly consists of two layers, the inner layer structure generally has multiple fire holes with a diameter of about 2mm, and the outer layer structure fire holes have various shapes and sizes, such as round holes, slits, etc.

[0003] In recent years, environmental regulations have become increasingly stringent, and the efforts to reduce carbon emissions have continued to increase. High-efficiency and low-pollution combustion methods have become the current theme of the times. At present, hydrogen energy has been highly favored by the energy industry because of its green and clean nature. Technologies such as hydrogen blending in natural gas pipelines, hydrogen-blended gas stoves, and hydrogen-blended combustion in equipment such as gas turbines and boilers are all hot research hotspots at this stage. For gas stoves, the combustion characteristics of hydrogen and natural gas are very different. Compared with natural gas, the flame propagation speed of hydrogen is very high, so the risk of flame flashback during premixed combustion will be greatly increased. Therefore, the adaptability of existing gas stoves developed based on natural gas fuel to hydrogen-containing fuels needs further study. In addition, due to the incomplete combustion of fuel and air, traditional gas stoves have yellow flames and red flames during the combustion process. Summary of the invention

[0004] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0005] In view of the above-mentioned prior art problems, the present invention is proposed.

[0006] The purpose of the present invention is to provide a hydrogen-blended gas combustion device, which aims to solve the risk of flame flashback during premixed combustion due to the high flame propagation speed of hydrogen when a gas cooker is burning, as well as the red flame and yellow flame phenomenon caused by incomplete combustion.

[0007] In order to solve the technical problems of the risk of flame flashback during premixed combustion due to the high flame propagation speed of hydrogen during combustion in the above-mentioned gas stove, as well as the red flame and yellow flame phenomena caused by incomplete combustion, the present invention provides the following technical solutions: a hydrogen-blended gas combustion device, which includes a positioning ring, a mounting ring hole is opened in the middle of which, an inner ring cover is inserted into the inner side of the mounting ring hole, and includes an inner ring plane end and a first side wall end, a plurality of groups of first fire holes are arranged in a circular array on the first side wall end, and an outer ring cover is arranged on the outer ring side wall of the positioning ring, and includes second fire holes arranged on the surface of the outer ring cover.

[0008] As a preferred solution of the hydrogen-blended fuel gas combustion device of the present invention, wherein: the horizontal height of the first flame hole is higher than the mounting ring hole.

[0009] As a preferred embodiment of the hydrogen-blended fuel gas combustion device of the present invention, the first fire holes are arranged in layers and surround the first side wall end, wherein the first fire holes are distributed in no less than two layers, and the first fire holes are staggered in the horizontal direction between two adjacent layers, and the distance between two groups of first fire holes closest to one group of first fire holes in an adjacent layer of first fire holes is equal.

[0010] As a preferred solution of the hydrogen-blended fuel gas combustion device of the present invention, the aperture of the first fire hole is set at 1.2 mm to 1.6 mm, and the distance between the fire holes in the same layer of first fire holes is set at 1.5 mm to 2 mm.

[0011] As a preferred solution of the hydrogen-blended fuel gas combustion device of the present invention, the diameter of the second fire holes is 1.2 mm to 1.6 mm, and the distance between adjacent second fire holes is 1.5 mm to 2 mm.

[0012] As a preferred embodiment of the hydrogen-blended fuel gas combustion device of the present invention, the outer ring cover comprises a first outer ring plane end, a second side wall end and a first inner wall end, the second side wall end is connected to the outer ring side of the first outer ring plane end, and the first inner wall end is connected to the inner ring side of the first outer ring plane end; the three together form an inwardly concave cavity, and the first inner wall end forms a placement hole in the middle; the outer ring side of the positioning ring matches the placement hole, the horizontal spacing between the inner wall end and the first side wall end is 100 mm, and the vertical spacing between the inner ring plane end and the outer ring cover away from the first outer ring plane end is 25 mm.

[0013] As a preferred embodiment of the hydrogen-blended fuel gas combustion device of the present invention, the second fire holes form three layers of outer fire rings, namely, inner, middle and outer layers, on the plate body at the flat end of the outer ring, and the second fire holes of each layer of the fire rings are evenly distributed in an array, and the spacing between two adjacent layers of the outer fire rings is 3mm to 5mm.

[0014] As a preferred solution of the hydrogen-blended fuel gas combustion device of the present invention, the outer outer fire ring is provided with 4 circles of second fire holes, and the inner and middle outer fire rings are provided with 3 circles of second fire holes.

[0015] As a preferred solution of the hydrogen-blended gas combustion device of the present invention, the outer ring cover also includes a second outer ring plane end, a third side wall end and a second inner wall end, the third side wall end is connected to the outer ring side of the second outer ring plane end, and the second inner wall end is connected to the inner ring side of the second outer ring plane end; the three are fixedly connected, and the second inner wall end forms a placement hole in the middle; the outer ring side of the positioning ring matches the placement hole.

[0016] As a preferred embodiment of the hydrogen-blended fuel gas combustion device of the present invention, the second fire holes are respectively opened in a plurality of groups on the plate body at the second outer ring plane end and the third side wall end, the plurality of groups of second fire holes are distributed in a circular array, and the inclination angle of the third side wall end is set to be 30° with the vertical direction of the second outer ring plane end.

[0017] The beneficial effects of the hydrogen-blended gas combustion device of the present invention are: increasing the combustion efficiency of the gas cooker without the risk of flame flashback during premixed combustion due to the high flame propagation speed of hydrogen and the red flame and yellow flame phenomenon caused by incomplete combustion. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0019] Figure 1 It is a schematic diagram of the overall structure in which the outer ring cover in the present invention is a plane.

[0020] Figure 2 It is a schematic diagram of the splitting of the outer ring cover in the present invention as a plane.

[0021] Figure 3 It is a top view of the outer ring cover in the present invention which is a plane.

[0022] Figure 4 It is a schematic structural diagram of the first side wall end in the present invention.

[0023] Figure 5 A detailed enlarged view of the first fire hole distribution in the first side wall end of the present invention

[0024] Figure 6 It is a schematic diagram of the overall structure of the side wall of the outer ring cover in the present invention.

[0025] Figure 7 It is a schematic diagram of the disassembly of the outer ring cover in the present invention.

[0026] Figure 8 It is a top view of the outer ring cover in the present invention.

[0027] Fig. 9 It is a side view of the outer ring cover in the present invention.

[0028] Fig.10 This is a comparison diagram of the staggered distribution of the first fire holes in the present invention.

[0029] Fig.11 This is a diagram showing the complete staggered degree of the first fire hole in the present invention.

[0030] Fig.12 This is a diagram of the gas experiment system in the present invention.

[0031] Fig.13 The figure is a diagram marking the horizontal and vertical heights of the first fire hole and the second fire hole and the inclination angle of the outer cover in the present invention. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0033] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0034] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0035] Example 1

[0036] Reference Figures 1 to 5 , which is the third embodiment of the present invention, provides a hydrogen-blended gas combustion device. According to Bernoulli's principle, when a fluid flows in a pipeline, the flow rate is inversely proportional to the cross-sectional area of ​​the pipeline. Therefore, when the aperture of the fire hole is reduced, the same gas flow needs to pass through a smaller cross-sectional area, resulting in an increase in the gas flow rate, and finally the spacing between adjacent first fire holes 202a in the same layer of first fire holes 202a is set at 1.5mm to 2mm.

[0037] It is noted that when the aperture of the first fire hole 202a is greater than 1.5 mm, the gaps between the first fire holes 202a will cause more gas to be released into the air instead of being effectively used in the cooking process, which will increase the cost of use and waste energy. As the aperture of the first fire hole 202a gradually increases, the temperature increase on the surface of the pot body gradually becomes gentler.

[0038] It should be noted that although reducing the aperture of the fire hole can increase the air flow velocity nearby, an aperture that is too small may also result in insufficient gas flow, affecting the stability and efficiency of combustion. According to experiments, the first fire hole accommodated on the surface of the inner ring cover 200 of normal size is in the range of 0mm to 1.5mm, and the flame of the first fire hole 202a can be set more densely. When the flame passes through the first fire hole 202a of 0mm to 1.5mm, the heat is lower. In this process, due to the small flame, it cannot provide sufficient heat and energy. Therefore, when the aperture of the first fire hole 202a is set in the range of 0mm to 1.5mm, the first fire hole 202a is smaller, resulting in the flame generated in the first fire hole 202a being too small, and the energy loss in the process of reaching the surface of the pot body is large.

[0039] When the aperture of the first fire hole 202a is set in the range of 1.5 mm to 2 mm, the temperature of the pot body changes slightly and tends to be stable, and at this time, the flame ejected from the first fire hole 202a can efficiently transfer heat to the pot body.

[0040] Therefore, when 1.5mm to 2mm is selected, both the stability and efficiency of combustion reach the optimal option.

[0041] Furthermore, the aperture of the first fire hole 202a is set at 1.2mm-1.6mm. When the aperture of the first fire hole 202a is set at 1.2mm-1.6mm, a finer flame can be generated, and each first fire hole 202a can provide more concentrated heat, which is beneficial to improve combustion efficiency, thereby reducing gas waste and saving energy costs.

[0042] Specifically, since the aperture of the first fire hole 202a is between 1.2 mm and 1.6 mm, the flame can be more easily controlled within a designated area, which greatly reduces the possibility of flame leakage, and also reduces smoke and odor.

[0043] Furthermore, the first fire holes 202a are arranged in several layers, and the first fire holes 202a are staggered between adjacent layers, and the spacing between a group of first fire holes 202a in one layer and the two closest groups of first fire holes 202a in an adjacent layer are equal, so that the heat generated by the inner ring cover 200 can be more uniform.

[0044] Furthermore: the spacing between adjacent second fire holes K in the same circle of second fire holes K is set at 3mm~5mm. Since the cross-section of the first outer ring plane end 301 is larger than the cross-section of the first side wall end 202, the spacing between adjacent second fire holes K in the same layer is set at 3mm~5mm. At this time, the second fire hole K can release more heat through a larger aperture relative to the first fire hole 202a, thereby increasing the thermal speed. The first fire hole 202a is set to a micro-aperture (with a quenching effect), and the anti-tempering ability is significantly improved.

[0045] The first fire holes 202a are staggered between two adjacent layers, and the first fire holes 202a of two adjacent layers are staggered in the vertical direction. It is found that the degree of staggered distribution between the adjacent two sides of the first fire holes 202a will have a certain impact on flame uniformity, combustion efficiency, CO emissions, service life, etc. Analysis of the aperture of the first fire holes 202a shows that when the aperture of the fire hole is too large, it may cause insufficient mixing of the gas and air, resulting in incomplete combustion, and the generation of more CO and other harmful gases.

[0046] The inner ring cover 200 is made of cast aluminum, and 10 groups of different inner ring covers 200 are manufactured for experiment. During the processing of the 10 groups of inner ring covers, the degree of offset between two adjacent layers of fire holes is changed.

[0047] Experimental system:

[0048] 1. Fan system: It consists of a blower and connecting pipes, which is responsible for providing air with a certain pressure and flow rate, and provides normal temperature air to the gas stove through the bracket at the end of the main air duct. According to the calculation of the ventilation resistance of the system and the coordination with the adjacent test bench, the specific parameters selected for this system are: speed 1450r / min, working pressure at normal pressure, flow rate 2.5-4m3 / h, motor power 250W.

[0049] 2. Cooling system: During the thermal efficiency test, it is difficult for the water in the heated aluminum pot to cool down by itself in a short time. Therefore, during the experiment, the fire protection system of the combustion chamber and the integrated water supply system of the stove are used to test the water supply, drainage and pot surface of the gas stove. This method cools the pot body while maintaining the temperature in the combustion chamber.

[0050] 3. Infrared ignition system: There is an infrared ignition device on the countertop of the stove, which mainly solves the energy waste caused by empty burning and improves the timeliness of gas supply. When the pot is not placed on the pot rack, the gas will not be supplied to the combustion chamber and the ignition system will not start. When the pot is placed on the pot rack, the infrared ignition system will start. This system effectively controls the supply and combustion of gas and saves energy.

[0051] Flue gas composition analysis system:

[0052] Test0300M is selected in the combustion experiment. It is a professional flue gas analysis instrument that can measure flue gas temperature, ambient temperature, oxygen, carbon dioxide, carbon monoxide, wind speed, pressure difference, excess air coefficient, etc. Test0300 flue gas analyzer is mainly composed of two parts: control operation machine and flue gas probe. It can measure the main parameters of gas measurement range, actual range, accuracy and response time.

[0053] Experimental test method: Under the same combustion / air equivalence ratio, the thermal efficiency and energy consumption of the gas stove when 2kg of drinking water is heated from room temperature to 100°C (boiling state). The experimental gas is a mixture of nitrogen (volume fraction of 20%), propane (volume fraction of 56%) and hydrogen (volume fraction of 24%), and its low calorific value is 34.9MJ / m3.

[0054] Further, such as Figure 5 , Fig.10 and Fig.11 As shown, an experiment was conducted based on the staggered arrangement of the first fire holes 202a and the staggered degree between two adjacent layers of fire holes (the staggered degree in the vertical direction between two groups of fire holes closest to one group of fire holes in one layer and the adjacent layer).

[0055] This test is aimed at the combustion efficiency and CO emission during the combustion process. The experimental contents are as follows:

[0056] Only the replacement of the inner ring cover 200 is controlled by the control variable method, and other conditions remain unchanged. Experiments are conducted from the fire holes with a staggered degree of 0% to the fire holes with a staggered degree of 100% and each group of data is recorded.

[0057] Experimental test method: First, a measuring cylinder with a volume greater than 2.5 liters, a temperature measuring instrument, a pot, tap water, and a stopwatch are required. Under the same combustion / air equivalence ratio, the thermal efficiency and energy consumption of the gas stove when 2 kg of drinking water is heated from room temperature to 100°C (boiling state) are measured. The experimental gas is a mixture of nitrogen (volume fraction of 20%), propane (volume fraction of 56%) and hydrogen (volume fraction of 24%), and its low calorific value is 34.9 MJ / m3.

[0058] (1) Experimental steps:

[0059] 1. The experiment will be carried out in the combustion chamber. First, turn on the gas distribution and supply system ( Fig.12 ) to check the air distribution system's sealing performance and close doors and windows to achieve a sealed environment.

[0060] 2. Before the experiment begins, check and debug the main inlet and outlet pipes of the gas stove to ensure the airtightness of the experiment and prevent accidents.

[0061] 3. Open the air and gas control valves, check the air circulation in the gas stove, and monitor the gas volume through the gas meter. During each experiment, use the gas meter to record the starting amount of gas and the ending amount after the experiment. At this time, the timer and gas meter are used together to obtain the gas consumption and time consumed during each experiment.

[0062] 4. Put water in the pot and place it on the pot rack. The infrared ignition device will automatically turn on and start heating.

[0063] 5. Use an electronic thermometer to monitor the water temperature. In this process, the electronic thermometer needs to be returned to the initial temperature after each set of experiments to avoid experimental errors. Insert the electronic thermometer probe two-thirds into the water. Wait until the temperature reaches the room temperature and the gas flow is stable before starting to record the flow meter readings at various locations.

[0064] 6. After measuring all the data under the current working conditions, adjust the flow valves of the gas stove according to different working conditions and enter the test of the next working condition.

[0065] 7. After completing all measurements, lift the pot, the infrared ignition system will automatically shut down, take out the measuring instrument safely, and shut down other systems.

[0066] 8. Post-processing and calculation of data.

[0067] The specific data obtained after the 10 groups of experiments are shown in the following table:

[0068]

[0069] According to experimental data, when the degree of stagger increases, the combustion efficiency gradually increases and the CO emissions gradually decrease. Therefore, it is selected to make the distances between the two groups of first fire holes 202a closest to the first fire holes 202a on the adjacent side equal, so as to maximize the degree of stagger, thereby achieving a more preferred effect.

[0070] At this time, the experimenter raised a question. He conducted multiple tests to verify whether the combustion efficiency and CO emissions affected by the degree of fire hole stagger would change with the increase of the service life. For example, if the inner ring cover 200 with a stagger degree of 100% is used for a long period of time, will the combustion efficiency gradually approach that of the inner ring cover 200 with a smaller stagger degree? If the combustion efficiency of both decreases a lot, how big will the difference be?

[0071] The experimental process is as follows:

[0072] 1. Take four sets of experimental data, respectively take four sets of inner ring covers 200 with stagger degrees of 0%, 30%, 60%, and 100%, and these four sets of inner ring covers 200 use inner ring covers 200 with a longer service life (the number of experiments and duration of the four sets of inner ring covers 200 are the same, and they are sealed and stored after the comparative experiments, and have not been used or handled separately during the period)

[0073] 2. Check and debug the sealing of the main inlet and outlet pipes of the gas stove, and check the air circulation in the gas stove. The process is the same as the above experimental process.

[0074] 3. Take 200 pairs of inner ring covers with four stagger degrees of 0%, 30%, 60% and 100% for experiment.

[0075] 4. In order to test the effect of four groups of inner ring covers 200 with different degrees of staggered arrangement of fire holes after a long period of use, the experimental process needs to be the same as the previous group of experimental processes. However, this test chooses to repeatedly test these four groups of inner ring covers 200 and record them, and then selects 5 groups from them and lists them. The experimental results are as follows:

[0076]

[0077]

[0078] During this experiment, it was found that the combustion efficiency of the inner ring cover 200 fire holes increased with the use cycle in the two cases of small and large staggered degrees:

[0079] The extent of reduction in combustion efficiency: when the fire hole stagger is smaller > when the fire hole stagger is larger.

[0080] It can be concluded that when the fire holes of the inner ring cover 200 are staggered to a greater extent, the combustion efficiency can be maintained at a higher level with smaller changes.

[0081] However, during this experiment, a special situation was discovered, in which the flame of the inner ring cover 200 was quickly extinguished after being ignited. This phenomenon occurred twice when the fire hole misalignment degree was 0%, only once when the misalignment degree was 30%, and did not occur when the misalignment degrees were 60% and 100%. Therefore, after the experiment, the phenomenon of the flames being ignited quickly after three times was tested.

[0082] Finally, the experimenters found that scaling occurred inside the inner ring cover 200 with fire hole staggered degrees of 0% and 30%, and the degree of scaling inside the inner ring cover with a fire hole staggered degree of 0% was greater than that with a fire hole staggered degree of 30%, while no scaling occurred inside the inner ring cover 200 with a staggered degree of 60% and 100%.

[0083] The scaling degree of the four sets of inner ring covers 200 was tested and detected, and the test was as follows:

[0084] 1. Use a laser scanner to scan the fire holes and transfer the scanned images to the image analysis tool. During the experiment, all holes need to be scanned and images obtained. The image analysis tool can be used to obtain the proportion of scaling in all fire holes to the surface area of ​​the fire holes.

[0085] 2. The four sets of inner ring covers 200 are placed stably on the experimental table, and the scaling ratio of the fire hole surface is tested. In this process, the scaling ratio of all the fire holes on the center cover 200 and the surface of the fire holes is tested as follows:

[0086]

[0087] The experiment found that the flameout phenomenon of the inner ring cover 200 is affected by the degree of scaling on the surface of the fire holes. According to the two sets of experimental data, it can be seen that the greater the degree of stagger between the fire holes, the smaller the proportion of scaling on the surface of the fire holes, thereby reducing the probability of "the gas stove goes out immediately after the fire holes produce flames after ignition". One reason for this situation depends on the degree of scaling of the fire holes. The stagger between the fire holes affects the combustion efficiency and CO, and also has a certain influence on the degree of scaling of the fire holes. Therefore, setting the stagger of the fire holes on the inner ring cover 200 to 100% can better reduce scaling on the surface of the fire holes, which is an optimal technical solution.

[0088] Example 2

[0089] Reference Figures 1 to 5 , which is the second embodiment of the present invention, the embodiment provides a hydrogen-blended gas combustion device, which is configured for embodiment 1 and includes a positioning ring 100, a mounting ring hole 101 is opened in the middle, an inner ring cover 200, and both ends of the inner ring cover 200 are plugged into the inner side of the mounting ring hole 101, and include an inner ring plane end 201 and a first side wall end 202, and a plurality of groups of first fire holes 202a are arranged in a circular array on the first side wall end 202, and an outer ring cover 300 is arranged on the outer ring side wall of the positioning ring 100, and includes a second fire hole K arranged on the surface of the outer ring cover 300, and the inner ring cover 200 is annularly arranged, and the internal mounting ring hole 101 cooperates with the inner ring cover 200, and a fixed inner ring cover 101 is formed by directly placing the inner ring cover 200 inside the mounting ring control 101

[0090] Furthermore, the horizontal height of the first fire hole 202a is higher than the mounting ring hole 101 to prevent the flame ejected from the first fire hole 202a from being blocked by the mounting ring hole 101. The first fire holes 202a are arranged in layers and surround the first side wall end 202. The first fire holes 202a are distributed in no less than two layers, and the first fire holes 202a are staggered in the horizontal direction between two adjacent layers. At this time, the staggered arrangement of the first fire holes 202 in an adjacent layer can prevent the flames from forming a stack, maximize the combustion efficiency, and make the bottom of the pot body evenly heated. The distance between the two groups of first fire holes 202a closest to one group of first fire holes 202a in an adjacent layer is equal.

[0091] Furthermore, the aperture of the first fire hole 202a is set at 1.2mm-1.6mm, and the spacing between the fire holes in the same layer of first fire holes 202a is set at 1.5mm-2mm. The aperture of the second fire hole K is 1.2mm-1.6mm, and the spacing between adjacent second fire holes K is 1.5mm-2mm.

[0092] Furthermore, the outer ring cover 300 includes a first outer ring plane end 301, a second side wall end 302 and a first inner wall end 303, the second side wall end 302 is connected to the outer ring side of the first outer ring plane end 301, and the first inner wall end 303 is connected to the inner ring side of the first outer ring plane end 301; the three together form a concave cavity, and the first inner wall end 303 forms a placement hole F in the middle; the outer ring side of the positioning ring 100 matches the placement hole F, so that the inner ring cover 200 and the outer ring cover 300 are fixed together through the positioning ring 100.

[0093] The aperture of all fire holes is reduced to 1.5mm to increase the air flow velocity near the hole, and the quenching effect of the micro-pore wall can inhibit flame flashback. In addition, while the micro-mixed combustion effectively avoids flashback, the degree of mixing of fuel and air near the hole is improved, which can reduce NOx emissions to a certain extent.

[0094] The horizontal spacing between the inner wall end 303 and the first side wall end 202 is 100 mm, the vertical spacing between the inner ring plane end 201 and the outer ring cover 300 away from the first outer ring plane end 301 is 25 mm, and the second fire holes K form three layers of outer fire rings 301a of inner, middle and outer layers on the plate body of the outer ring plane end 301. The second fire holes K of each layer of the three-layer fire ring 301a are evenly distributed in an array, and the spacing between two adjacent layers of the outer fire ring 301a is 3 mm to 5 mm.

[0095] Furthermore, the outer outer fire ring 301a is provided with 4 circles of second fire holes K, and the inner and middle outer fire rings 301a are provided with 3 circles of second fire holes K. This design can provide evenly distributed heat and avoid the phenomenon of heat accumulation towards the center due to buoyancy effect.

[0096] Example 3

[0097] Reference Figures 4 to 9 , which is the fourth embodiment of the present invention, and this embodiment provides a hydrogen-blended fuel gas combustion device: the experimental process refers to the control variable method of Example 1. Further, in order to determine the optimal height and spacing between the first fire hole 202a and the second fire hole K to achieve the best combustion efficiency and flame uniformity, the vertical height difference (the distance from the bottom of the first fire hole to the bottom of the second fire hole) and the horizontal spacing (the horizontal distance from the first fire hole 202a to the center of the second fire hole K) are used as variables to obtain the experimental results.

[0098] Furthermore, through experiments, it was found that the horizontal spacing (the horizontal distance from the first fire hole 202a to the center of the second fire hole K) was used as a variable to obtain the experimental results and the vertical height difference (the distance from the bottom of the first fire hole 202a to the bottom of the second fire hole K). After combustion, it also has a certain impact on the combustion efficiency, CO emissions and flame uniformity.

[0099] (1) Experimental steps: Same as in Example 1

[0100] (2) Notes:

[0101] 1. When measuring, use the electronic thermometer probe to stir the water in the pot so that it is heated evenly.

[0102] 2. When conducting the next working condition test, the water should be replaced with normal temperature water and the pot surface should be cooled to reach normal temperature.

[0103] 3. Each working condition should be tested multiple times to prevent large errors.

[0104] 4. The smoke composition test should be carried out 15 minutes after the start of combustion.

[0105] Note that:

[0106]

[0107] in:

[0108] CO 1 ——Carbon monoxide content in dry flue gas when excess air coefficient α=1 (%);

[0109] CO'——the content of carbon monoxide obtained by sampling (%);

[0110] CO” - Carbon monoxide content in indoor dry air (%);

[0111] O 2 '——Oxygen content in dry air (%).

[0112] Note that:

[0113]

[0114] in:

[0115] η measured thermal efficiency (%);

[0116] t 1 is the initial water temperature (℃);

[0117] t 2 is the final water temperature (℃);

[0118] c p The specific heat capacity of water at constant pressure is 4.187 kJ / (kg·℃);

[0119] Q d The low calorific value of natural gas under test is 103.7 (MJ / m 3 );

[0120] M w Water volume: 2kg;

[0121] M q is the natural gas consumption (m 3 ).

[0122] The specific data is as follows:

[0123]

[0124]

[0125] The table data shows that the highest combustion efficiency occurs when the horizontal distance is 100 mm and the vertical height difference is 25 mm (experiment number 4):

[0126] CO emissions: The lowest CO emissions also occurred in experiment number 4.

[0127] And through the experimental data, it can be found that under the conditions of a horizontal distance difference of 100mm and a vertical height difference of 25mm, for the experimental data with test numbers 3 and 5, the combustion efficiency is 26% and 26% higher, and the CO emissions are 33ppm and 31ppm lower. In addition, these two groups of experiments have larger changes than the other groups of experiments with adjacent numbers, which significantly improves the combustion efficiency and significantly reduces CO emissions.

[0128] Comprehensive consideration: Experiment numbers 3 to 5 show higher combustion efficiency and lower CO emissions, which indicates that the setting of 100mm horizontal distance and 25mm vertical height difference is optimal.

[0129] Further, according to the second embodiment, a plurality of groups of the second fire holes K are respectively opened on the plate body of the second outer ring plane end 304 and the third side wall end 305 , and the plurality of groups of the second fire holes K are distributed in a circular array.

[0130] Since the gas stove does not burn pure fuel during the combustion process, it will come into contact with the air during the combustion process. The flame in the process of contact with the air can form a combustion-supporting and energy-saving effect. However, most of the existing technologies use a gas stove with a flat-top outer ring. At this time, the contact area between the flame and the air is reduced during the combustion process, thereby reducing the effect of air assisting combustion.

[0131] With regard to the situation of flame and air mixed combustion, it can be concluded that the combustion efficiency of the gas stove is affected to a certain extent.

[0132] Therefore, an experiment is conducted on the inclination angle (when the inclination angle of the third side wall end 305 is set to the included angle with the vertical direction of the second outer ring plane section 304):

[0133] 1. The outer ring cover 300 is tilted, and the tilt angle of the outer ring cover 300 is set between 20° and 45°.

[0134] 2. The controlled variable method was also used during the experiment to ensure that all conditions except the tilt angle remained unchanged.

[0135] 3. Place 2kg of water in the pot. When introducing water, it is necessary to measure it with a measuring cylinder and pour it into the pot. Pour it slowly along the pot wall to avoid spilling or splashing. Heat the pot with a gas stove and start the stopwatch at the same time. Place a temperature measuring instrument at a position two-thirds of the water level in the pot. Avoid contact with the side wall of the pot, and the temperature measuring instrument should be placed in the same position each time. At this time, observe the temperature change, stop heating and timing when the water temperature reaches a fixed value, and always observe the gas consumption and the time it takes for the water temperature to reach a fixed value, so as to obtain the combustion efficiency. (Note that the water temperature cannot be set to 100° to avoid the movement of boiling water that will affect the temperature measuring instrument and cause data fluctuations.)

[0136] The set value is the set water temperature (°), and t is the time it takes for water to reach the set value (min).

[0137] The third side wall end 305 is inclined at an angle of 30° to the vertical direction of the second outer ring plane end 304 . When the third side wall end 305 is inclined at an angle of 30° to the vertical direction of the second outer ring plane segment 304 , the third side wall end 305 is inclined at an angle of 30° to the vertical direction of the second outer ring plane segment 304 .

[0138] At this time, the inclination angle of the third side wall end 305 is controlled so as to be between 20° and 45° for the experiment.

[0139] The results obtained based on the experimental data are as follows:

[0140] Tilt angle (°) Combustion efficiency (%) 20 72.1 22.5 72.9 25 73.8 27.5 74.1 30 80.2 32.5 74.2 35 73.9 37.5 73.2 40 72.9 42.5 72.1 45 71.9

[0141] During the experiment, it was found that when the tilt angle was about 20°, the flame produced by the gas stove appeared yellow after burning for 30 seconds, and as time went on, the flame gradually turned red.

[0142] As the tilt angle gradually increases, the flame produced when the gas stove starts to burn appears blue until the gas stove is turned off after the experiment. During this process, the flame of the gas stove always appears blue (the color purity of the flame changes slightly during this process).

[0143] However, it can be seen from the experimental data that when the inclination angle increases from 27.5° to 30°, the combustion efficiency increases significantly, with an increase of 6.1%, while the variation range of the combustion efficiency of the other groups of data is about 0.7%. After the inclination angle increases from 30°, the combustion efficiency begins to decline again, and the combustion efficiency begins to decrease significantly when the inclination angle is between 30° and 32.5°, decreasing by 6%, and then begins to decrease slightly in the range of 32.5° to 45°, decreasing by about 0.46%.

[0144] Therefore, according to experimental data, it is concluded that the most preferred effect is when the inclination angle of the third side wall end 305 to the vertical direction is 30°.

[0145] Therefore, three layers of stacked fire can be formed while ensuring the highest combustion efficiency. When the combustion efficiency of the burner is maximized, the third side wall end 305 needs to be tilted 30° with the vertical direction.

[0146] Example 4

[0147] Reference Figures 4 to 9, which is the fourth embodiment of the present invention, the embodiment provides a hydrogen-blended gas combustion device, which is arranged according to embodiment 3 and includes a positioning ring 100, a mounting ring hole 101 is opened in the middle of the positioning ring, an inner ring cover 200, which is inserted into the inner side of the mounting ring hole 101, and includes an inner ring plane end 201 and a first side wall end 202, and a plurality of first fire holes 202a are arranged in a circular array on the first side wall end 202, and an outer ring cover 300 is arranged on the outer ring side wall of the positioning ring 100, and includes second fire holes K arranged on the surface of the outer ring cover 300, and the horizontal height of the first fire holes 202a is higher than the mounting ring hole 101, and the principle is the same as that of embodiment 1.

[0148] Furthermore, the first fire holes 202a are arranged in layers and surround the first side wall end 202, wherein the first fire holes 202a are distributed in no less than two layers, and the first fire holes 202a are staggered in the horizontal direction between two adjacent layers, and the distances between two groups of first fire holes 202a closest to one group of first fire holes 202a in an adjacent layer of first fire holes 202a are equal.

[0149] Furthermore, the aperture of the first fire hole 202a is set at 1.2mm-1.6mm, and the spacing between the fire holes in the same layer of first fire holes 202a is set at 1.5mm-2mm. The aperture of the second fire hole K is 1.2mm-1.6mm, and the spacing between adjacent second fire holes K is 1.5mm-2mm.

[0150] Furthermore, the outer ring cover 300 also includes a second outer ring plane end 304, a third side wall end 305 and a second inner wall end 306, the third side wall end 305 is connected to the outer ring side of the second outer ring plane end 304, and the second inner wall end 306 is connected to the inner ring side of the second outer ring plane end 304; the three are fixedly connected, and the second inner wall end 306 forms a placement hole F in the middle; the outer ring side of the positioning ring 100 matches the placement hole F.

[0151] Furthermore, several groups of second fire holes K are respectively opened on the plate body of the second outer ring plane end 304 and the third side wall end 305, and the several groups of second fire holes K are distributed in a circular array. The inclination angle of the third side wall end 305 is set to be 30° with the vertical direction of the second outer ring plane end 304 so that the flame can fully contact with oxygen during the combustion process, and the generated flame can cover the surface of the pot body more evenly.

[0152] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0153] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A hydrogen-blended fuel gas combustion device, characterized in that: include, A positioning ring (100) having a mounting ring hole (101) formed in the middle thereof; An inner ring cover (200) is inserted into the inner side of the mounting ring hole (101), and comprises an inner ring plane end (201) and a first side wall end (202), wherein the first side wall end (202) has a plurality of groups of first fire holes (202a) arranged in a circular array; The outer ring cover (300) is arranged on the outer ring side wall of the positioning ring (100) and comprises a second fire hole (K) arranged on the surface of the outer ring cover (300).

2. The hydrogen-blended fuel gas combustion device according to claim 1, characterized in that: The first fire hole (202a) is at a higher level than the mounting ring hole (101).

3. The hydrogen-blended fuel gas combustion device according to claim 2, characterized in that: The first fire holes (202a) are arranged in layers and surround the first side wall end (202); The first fire holes (202a) are distributed in no less than two layers, and the first fire holes (202a) are staggered in the horizontal direction between two adjacent layers, and the distances between two groups of first fire holes (202a) closest to one group of first fire holes (202a) in an adjacent layer of first fire holes (202a) are equal.

4. The hydrogen-blended fuel gas combustion device according to claim 3, characterized in that: The aperture of the first fire hole (202a) is set at 1.2 mm to 1.6 mm; In the first fire holes (202a) of the same layer, the distance between the fire holes is set to be 1.5 mm to 2 mm.

5. The hydrogen-blended fuel gas combustion device according to claim 4, characterized in that: The diameter of the second fire holes (K) is 1.2 mm to 1.6 mm, and the distance between adjacent second fire holes (K) is 1.5 mm to 2 mm.

6. The hydrogen-blended fuel gas combustion device according to claim 5, characterized in that: The outer ring cover (300) comprises a first outer ring plane end (301), a second side wall end (302) and a first inner wall end (303), wherein the second side wall end (302) is connected to the outer ring side of the first outer ring plane end (301), and the first inner wall end (303) is connected to the inner ring side of the first outer ring plane end (301); the three together form a concave cavity; The first inner wall end (303) forms a placement hole (F) in the middle; the outer ring side of the positioning ring (100) matches the placement hole (F); The horizontal distance between the inner wall end (303) and the first side wall end (202) is 100 mm, and the vertical distance between the inner ring plane end (201) and the outer ring cover (300) away from the first outer ring plane end (301) is 25 mm.

7. The hydrogen-blended fuel gas combustion device according to claim 6, characterized in that: The second fire holes (K) form three layers of outer fire rings (301a) of inner, middle and outer layers on the plate body of the outer ring plane end (301), and the second fire holes (K) of each layer of the fire rings are evenly distributed in an array; The distance between two adjacent layers of the outer fire rings (301a) is 3 mm to 5 mm.

8. The hydrogen-blended fuel gas combustion device according to claim 7, characterized in that: The outer outer fire ring (301a) is provided with four circles of second fire holes (K), while the inner and middle outer fire rings (301a) are provided with three circles of second fire holes (K).

9. The hydrogen-blended fuel gas combustion device according to claim 5, characterized in that: The outer ring cover (300) further comprises a second outer ring plane end (304), a third side wall end (305) and a second inner wall end (306), wherein the third side wall end (305) is connected to the outer ring side of the second outer ring plane end (304), and the second inner wall end (306) is connected to the inner ring side of the second outer ring plane end (304); the three are fixedly connected; A placement hole (F) is formed in the middle of the second inner wall end (306); the outer ring side of the positioning ring (100) matches the placement hole (F).

10. The hydrogen-blended fuel gas combustion device according to claim 9, characterized in that: The second fire holes (K) are respectively provided in a plurality of groups on the plate body at the second outer ring plane end (304) and the third side wall end (305), and the plurality of groups of second fire holes (K) are distributed in a circular array; The inclination angle of the third side wall end (305) is set to an angle of 30° with the vertical direction of the second outer ring plane end (304).

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