JP2012042068A - Hydrogen cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safe hydrogen cooker stably ejecting flames without causing backfire.SOLUTION: Hydrogen is supplied to a gas burner 8 from a hydrogen cylinder 1 in which hydrogen is pressurized and stored, through a backfire-preventing water tank 3 and a flame-coloring-agent tank 4 for coloring flames. The nozzle diameter of the gas burner 8 is formed in 0.6-1.6 mm, and a metal mesh 11 is arranged so that the flames can be seen on the gas burner 8, thus preventing a cook from getting burnt while preventing the occurrence of backfire.

Description

  The present invention relates to a hydrogen cooking apparatus that cooks by burning hydrogen.

  Hydrogen is suitable for the global environment because it turns into water vapor and does not discharge carbon dioxide when burned, but there is a risk of explosion when mixed with air (oxygen), and it is completely used for general cooking. Was not. However, the present inventor has found that if a sufficient safety device is provided during the production of the hydrogen generator, hydrogen cooking can be performed without carbon monoxide poisoning and with little outflow of moisture from the food.

Patent 2009-120757

  Based on this knowledge, there is no flashback and hydrogen combustion cannot be visually observed, so that a color is attached to the flame so that more uniform combustion can be ensured.

  Therefore, the hydrogen cooking apparatus of the present invention includes a hydrogen cylinder in which hydrogen is pressurized and stored, a pressure adjustment valve that adjusts a delivery pressure from the hydrogen cylinder, a hydrogen gas burner for burning hydrogen, and the gas burner and the hydrogen A backfire prevention device is provided between the cylinders to prevent the flame of the gas burner from returning, and the nozzle diameter of the gas burner is set to 0.6 mm to 1.6 mm.

  Further, the hydrogen gas burner is adapted to change the nozzle diameter depending on the position so that the heating power is uniform on the surface of the food, and the nozzle diameter is directed from the upstream side of the hydrogen gas flow path to the downstream side of the hydrogen gas flow. It is preferable to increase gradually.

  Furthermore, it is preferable to provide a flame identifying means so as to cause a flame reaction in the hydrogen gas supplied from the hydrogen cylinder.

  Furthermore, it is preferable that the flame identifying means is a flame colorant tank provided between the backfire prevention device and the gas burner, and is supplied to the hydrogen gas burner through the flame colorant tank.

  Further, the flame identification means is a hydrogen generator that generates hydrogen by supplying sodium hydroxide into a SUS304 container and heating the container to 300 to 500 ° C. to generate hydrogen, which is generated from this hydrogen generator. Preferably, the hydrogen contains fine particles of sodium hydroxide and this hydrogen is supplied to the gas burner via a hydrogen cylinder.

  Furthermore, it is preferable that the flame identifying means is made of a metal mesh that is provided on a gas burner and becomes red by a hydrogen flame.

  Furthermore, it is preferable to provide means for preventing air accumulation such as glass fiber and metal mesh so that air cannot be accumulated in the hydrogen circulation space in the gas burner.

  Furthermore, the hydrogen gas burner is composed of a nozzle forming body having an inverted frustoconical shape and a large number of nozzles, and a bowl-shaped receiving body that receives the nozzle forming body, and a hydrogen supply port faces the bottom of the receiving body. The nozzle forming body has a small recess facing the hydrogen supply port at the bottom, and a narrow groove is formed radially from the recess, and a nozzle hole is formed in the narrow groove in the axial direction of the nozzle forming body. The nozzle holes are preferably opened on the upper surface of the nozzle forming body.

  The nozzle diameter is important to prevent air (oxygen) from entering the hydrogen flow path during combustion of the gas burner. If the nozzle diameter is too thin, a sufficient amount of hydrogen will not come out, and if the nozzle diameter is large As a result of the experiment, it was found that the nozzle diameter should be 0.6 mm to 1.6 mm because air around the nozzle outlet enters the flow path and causes backfire.

  Further, since the pressure is high on the upstream side of the hydrogen flow of the gas burner, a large amount of hydrogen flows out from the nozzle, but the pressure on the downstream side of the hydrogen flow path is high, so the amount of hydrogen flowing out from the nozzle decreases. Therefore, if the nozzle diameter is gradually increased from the upstream side to the downstream side so that the nozzle diameter on the upstream side of the flow path is reduced and the nozzle diameter on the downstream side is increased, the heating power of the groin surface of the food becomes uniform. (Claim 2).

  The flame of hydrogen gas is transparent when completely burned and cannot be visually observed, so if a flame identification means is provided that causes the flame to react with the flame so that it is visible, burns can be prevented (Claim 3). The flame identification means is a flame colorant tank containing flame colorant such as caustic soda (Claim 4). If a hydrogen generator using sodium hydroxide is used, a flame reaction of sodium is caused. (Claim 5), if the metal mesh is provided on the burner, the mesh becomes red and can be visually observed (Claim 6).

  In addition, it is important not to create a reservoir where air accumulates in the hydrogen flow path. If glass fiber or a metal mesh is placed in the flow path, such a reservoir can be eliminated, and the flame to return can be shut off. Can be effectively prevented (claim 7).

  In addition, when the hydrogen flame is discharged in a circular shape, an inverted conical nozzle forming body is housed in the receiver, and if the nozzle is formed in the axial direction of the nozzle forming body, there is no air accumulation, and the nozzle forming body has an inverted frustoconical shape. Since the nozzle is formed over a certain length in the axial direction, backfire is effectively prevented (claim 8).

It is a schematic block diagram of the hydrogen cooking device of this invention. It is a schematic block diagram of the hydrogen generator used for a hydrogen cooking apparatus. It is a top view of the gas burner which makes a part of hydrogen cooking device. It is sectional drawing of the combustion cylinder of a gas burner. It is a perspective view which shows the other Example of a gas burner. It is a top view which shows other Example of a gas burner. It is a top view which shows a part of combustion part of the gas burner of FIG. It is a cross-sectional view of the combustion part of the gas burner of FIG. It is a perspective view which shows other Example of a gas burner. It is a perspective view of the upper surface side of the nozzle formation body shown in FIG. It is a perspective view by the side of the bottom face of the nozzle formation body shown in FIG. It is a perspective view which shows the receiving body of the nozzle formation body shown in FIG. It is sectional drawing which shows other Example of a gas burner.

  Embodiments of the present invention will be described below with reference to the drawings.

  In FIG. 1, a hydrogen cooking apparatus H according to the present invention includes a hydrogen cylinder 1 for storing hydrogen at a high pressure, and the hydrogen cylinder 1 includes a pressure regulating valve 2 for adjusting the pressure of flowing hydrogen. The hydrogen that has flowed through the pressure regulating valve 2 flows into a flame colorant tank 4 as flame identification means in which powder of caustic soda or the like is enclosed through a backfire prevention device 3 comprising a water tank.

  On the other hand, the flame colorant tank 4 is connected to a cooking table 5, and the cooking table 5 includes a frame 6 and legs 7 that support the frame 6, and a gas burner 8 is placed in the frame 6. A wire net 9 is provided, and a food 10 to be beaten is placed on the wire net 9.

  In addition, since the hydrogen flame is transparent and cannot be seen when completely fueled, a stainless metal mesh 11 is provided between the wire mesh 9 and the gas burner 8 as a flame identifying means, and this metal mesh turns red when heated by hydrogen. A person can recognize hydrogen combustion and effectively prevent burns.

  Further, as the flame identifying means, a hydrogen generator 20 as shown in FIG. 2 is provided, and fine powder of caustic soda is mixed with the hydrogen flowing out from the hydrogen generator 20, and this is added to the hydrogen cylinder via the pressurizing pump 21. The hydrogen may be stored in 1 and supplied to the gas burner 8. In this case, the color former tank 4 is not necessary.

  The hydrogen generator 20 has a rectangular tube-like casing 22, and a steam chamber 23 is provided in the vicinity of the end portion in the casing 21, and water from a water tank 24 is supplied to the steam chamber 23 with a water pump 25. A certain amount is sent through the cable.

  On the other hand, the casing 22 is made of SUS304 (Cr18-Ni8-residual Fe), and the vapor chamber 23 is connected to the reactant chamber 24. The reactant chamber 24 contains alkali metal hydroxide such as sodium hydroxide or potassium hydroxide. An object (reactant 25) is stored, and fins 26 made of SUS304 are immersed in the reactant 25. The fins 26 and the inner wall of the casing 22 are in contact with the reactant 25. The fine particle group P scattered from the liquid surface collides with the inflowing water vapor to generate hydrogen. This hydrogen is stored in the hydrogen cylinder 1 together with a part of the fine particle group P, and this hydrogen is burned by the gas burner 8. Then, a flame reaction of sodium Na occurs. The reactant 25 is heated to 300 to 500 ° C. by a heater (not shown).

  As shown in FIG. 3, the gas burner 8 is a combination of a plurality of combustion cylinders 8a, 8a... 8a, and hydrogen from the root pipe 8b passes through the dispersion pipe 8c to the dispersion pipe 8c in the axial direction. It is supplied to the combustion cylinder 8a provided at a predetermined interval. As shown in FIG. 4, the combustion cylinder 8a is provided with a large number of pores (diameter of about 1 mm) h, h... H, and external air flows into the hydrogen circulation space in the hollow portion of the combustion cylinder 8a. In order to prevent air retention, an air retention prevention means 30 such as glass fiber or metal mesh is provided.

  The gas burner 8 may be a planar burner 40 as shown in FIG. 5. The planar burner 40 includes a hydrogen pipe 41, a dispersion portion 42 to which the hydrogen pipe 41 is connected, and a planar main body. 43. The main body 43 is vertically divided by a partition plate 44, and a large number of pores h, h... H are formed on the upper surface of the main body. The hydrogen passes from the dispersing portion 42 to the upper side through the lower side of the partition plate 44, and the diameter of the pores h is formed so as to gradually increase from the upstream side US to the downstream side DS of the hydrogen flow. The high pressure part (US side) reduces the pore diameter, and the low gas pressure part (DS side) increases the pore diameter so that the amount of gas flowing out of the pores is almost uniform. ing.

  The diameter of the pores of the gas burner 8 is extremely important for allowing hydrogen to flow stably from all the pores without causing a stable combustion and backfire. In general, the gas pressure of hydrogen when being supplied to the gas burner is 1 to 2 atm. For example, in the gas burner 50 shown in FIG. 6, the combustion portion depends on the opening degree of the cock 53 of the valve 52 provided in the root pipe 51. Although the gas pressure of 54 slightly changes, a change in the range of about 1 to 2 atmospheres does not significantly affect what determines the diameter of the pore h. The combustion part 54 has a continuous shape, and the central part of the continuous pipe is recessed to form both end pipes 54a and 54a and central pipes 54b and 54b.

  As shown in FIGS. 7 and 8, the both end pipes 54a and the central pipe 54b are stainless steel pipes having an outer diameter of 13.8 mm, an inner diameter of 9.8 mm, and a wall thickness of 2 mm. A pair of pores h are formed, the interval between the pairs is 10 mm, the length of each tube in the combustion section is 280 mm, and 54 (27 pairs) pores are formed in each tube.

  The diameter of the pores was changed while adjusting the cock 53 appropriately with such a dimensional relationship. In addition, although 0.2 mm of pores can be formed with a laser, other diameters were formed with a drill. Hereinafter, the relationship of the flame with the square diameter is shown below.

Pore size results
0.2mm Thermal power is weak and insufficient
0.4mm 〃
0.6mm Thermal power is slightly weak and can be used even though it is applied to uniformity.
0.8mm 〃
1.0mm Thermal power is sufficient and uniform heating is possible
1.2mm 〃
1.4mm Thermal power is sufficient but the uniformity is slightly poor but can be used
1.6mm 〃
1.8mm Thermal power is too high and lacks uniformity.
Cannot be used due to backfire in a 2.0mm tube

  From the above experimental results, it was found that the diameter of the pores is preferably about 0.6 mm to 1.6 mm, and particularly preferably 1 mm, under a gas pressure of 1 to 2 atmospheres.

  Next, the gas burner 50 for making a circular flame for heating a kettle, a pan, etc. is demonstrated with reference to FIGS. The gas burner 50 includes an inverted truncated cone-shaped nozzle forming body 51 and a bowl-shaped receiving body 52 that detachably receives the nozzle forming body 51, and the nozzle forming body 51 has a height of 20 mm or more. A small recess 53 (FIG. 11) is formed on the bottom surface, and narrow grooves 54, 54... 54 are radially formed from the small recess 53 along the bottom surface and the inclined side surface. Diameter nozzle holes 55, 55... 55 are formed. The nozzle hole 55 is opened on the upper surface of the nozzle forming body, from which the flame flows out uniformly. Since the nozzle forming body 51 has a height of 20 mm or more, the length of the nozzle hole extending in the axial direction is also 10 mm or more, and the flame is cut off by preventing the inflow of air from the outside. It does n’t happen at all. Corresponding to the small dents on the bottom surface of the nozzle forming body 51, a hydrogen supply port 56 is exposed on the bottom surface of the receiver 52, and the hydrogen supply port 56 is formed in the cylinder 57. Hydrogen flowing in from the hydrogen supply port 56 flows into the narrow groove 54 through the small recess 53 of the nozzle forming body 51, and flows out from the upper surface of the nozzle forming body 51 through the nozzle hole 55 opened in the narrow groove 54. And it ignites here and becomes a flame. Since there is no place for air to accumulate in this structure, backfire does not occur.

  FIG. 13 shows a gas burner 140 that can be easily molded. The gas burner 140 has a disk-shaped nozzle forming body 131 engaged with a shallow cylindrical receiving body 130, and a small dent is formed at the center of the bottom surface of the nozzle forming body 131. 132 is provided. Hydrogen is supplied to the small recess 132 from the hydrogen supply pipe 135, and the narrow grooves 136 extend radially from the small recess 132, and the leading end thereof opens to the outlet 133. Further, from the middle of the narrow groove 136, nozzles 134, 134...

  The hydrogen cooking apparatus of the present invention can be used as a heating means for business use or home use, and can be used for grilling meat and fish or for hot water.

DESCRIPTION OF SYMBOLS 1 ... Hydrogen cylinder 3 ... Backfire prevention apparatus 4 ... Flame colorant tank 5 ... Cooking table 8 ... Gas burner 9 ... Wire net 11 ... Metal mesh 20 ... Hydrogen generator 24 ... Water tank 30 ... Retention prevention means 40 ... Planar burner 50 ... Gas burner

Claims (8)

  A hydrogen cylinder in which hydrogen is stored under pressure, a pressure regulating valve that regulates the delivery pressure from the hydrogen cylinder, a hydrogen gas burner for burning hydrogen, and a flame of the gas burner provided between the gas burner and the hydrogen cylinder does not return. A hydrogen cooking apparatus having a backfire prevention device for making the nozzle diameter of the gas burner 0.6 mm to 1.6 mm.   In the hydrogen gas burner, the nozzle diameter is changed depending on the position so that the heating power is uniform on the surface of the food, and the nozzle diameter gradually increases from the upstream side of the hydrogen gas flow path toward the downstream side of the hydrogen gas flow. Hydrogen cooking device.   2. A hydrogen cooking apparatus according to claim 1, wherein flame identification means is provided so as to cause a flame reaction in the hydrogen gas supplied from the hydrogen cylinder.   The hydrogen cooking apparatus according to claim 3, wherein the flame identifying means is a flame colorant tank provided between the backfire prevention device and the gas burner, and is supplied to the hydrogen gas burner through the flame colorant tank.   The flame identifying means is a hydrogen generator that puts sodium hydroxide into a SUS304 container and heats the container to 300 to 500 ° C. to supply water vapor to generate hydrogen, and the hydrogen generated from the hydrogen generator is water. The hydrogen cooking apparatus according to claim 3, comprising fine particles of sodium oxide and supplying the hydrogen to a gas burner through a hydrogen cylinder.   4. The hydrogen cooking apparatus according to claim 3, wherein the flame identifying means is made of a metal mesh that is provided on a gas burner and becomes red by a hydrogen flame.   2. The hydrogen cooking apparatus according to claim 1, wherein air accumulation prevention means such as glass fiber and metal mesh is provided so that air cannot accumulate in the hydrogen circulation space in the gas burner.   The hydrogen gas burner is composed of a nozzle forming body having a reverse frustoconical shape and a large number of nozzles, and a bowl-shaped receiving body that receives the nozzle forming body, with a hydrogen supply port facing the bottom of the receiving body, The nozzle forming body has a small recess facing the hydrogen supply port at the bottom, and a narrow groove is formed radially from the recess, and a nozzle hole is formed in the narrow groove in the axial direction of the nozzle forming body. The hydrogen cooking apparatus according to claim 1, wherein the hole is opened on the upper surface of the nozzle forming body.

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