JP2003129072A - Combustion gas suitable for fusing or brazing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method that safely produces a combustion gas, which is suitable for highly efficient fusing or brazing, at a low cost. SOLUTION: In the production method for the combustion gas suitable for fusing or brazing to which the present invention relates, the mixed gas consisting of hydrogen gas and oxygen gas, which is generated by the electrolysis of water or steam, is combined with propane gas, ethylene gas or liquefied petroleum gas such as natural gas and so on which are all used for fusing steel materials so that the content ratio among hydrogen, oxygen and liquefied petroleum gas may be fixed over the upper limit of combustion and explosion. As a result, handling out of the range of combustion and explosion is made possible.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for producing a combustion gas suitable for fusing or brazing.

[0002]

2. Description of the Related Art Conventionally, as a combustion gas for fusing, hydrogen filled in a cylinder and other combustible gas such as natural gas,
Propane gas, ethylene gas, or a vaporized gas of a hydrocarbon solvent such as methanol, isopropyl alcohol, acetone, toluene, and normal hexane may be mixed and used, but the cost is high and it is not general.

In the conventional technique, a flammable gas filled in a cylinder is mixed or a gas called blast furnace gas (generally C gas) generated during iron making in a steel mill is used for fusing. In terms of cost, in particular, for liquefied fuel gas filled in cylinders, container costs, transportation costs, etc. are naturally accounted for as costs, and users must purchase at a cost including fuel tax. In terms of functionality as a fusing gas, the fact is that the surface roughness of the fusing surface, fusing speed, peelability of fusing slag, flaw due to heat effect of fusing material, fusing fume, etc. are not taken into consideration. is there.

[0004]

Therefore, the inventor of the present application considered using a mixed gas of hydrogen and oxygen by electrolysis of water, which is inexpensive in terms of cost, for fusing. In particular, the production of hydrogen and oxygen by electrolysis of water can be easily generated as needed, so that there is no need for storage, and the risk of natural disaster or fire caused by storage can be avoided. become. In terms of cost, hydrogen supplied from a cylinder is industrially produced mainly by water electrolysis, and the reason is that it is the lowest cost, and at the same time, the oxygen produced at the same time is also generated. It can be used effectively. This is also the most profitable means.

However, particularly in a gas generator utilizing the electrolysis of water, which is generated when hydrogen, which is a combustible gas, and oxygen, which is a combustion supporting gas, are mixed, the mixed gas generated is explosive. (Or flammability), the gas mixture must be non-explosive (or non-flammable).

Regarding this point, the following method can be considered. First, the first method is to reduce or increase the component ratio (relative concentration) of either the flammable gas or the combustion-supporting gas in the mixed gas so that the gas composition is outside the explosion range of the two-component system. It is possible to keep it. In this case, even if the safety is improved, one component contains a wasteful part that is relatively redundant with respect to the other component, and is inefficient when considered as a combustion gas for fusing. Next, as a second method, it is conceivable to add an inert gas to the mixed gas to keep the gas composition outside the explosion range of this three-component system. In this case also, the safety is improved, but when considered as the combustion gas for fusing, it contains an inert gas that does not participate in combustion, which is not desirable in terms of efficiency.

[0007] Considering the case of using for fusing, the mixed gas of oxygen and hydrogen has its own advantages such as high-speed cutting capability and good peeling property.
The disadvantages of being unsuitable for continuous operation and insufficient measures against delayed cracking cannot be ignored.

In order to overcome such a situation and to effectively use a mixed gas of hydrogen and oxygen by electrolysis of water, which is inexpensive in terms of cost, as a combustion gas suitable for fusing or brazing, After further research, the inventor of the present invention added another combustible gas to the mixed gas obtained by electrolysis to keep the gas composition (relative concentration of components, that is, volume ratio) outside the explosion range of this three-component system. In particular, the present invention has been accomplished by completing the invention of a method for producing a combustion gas that has no safety problems, is efficient, and has a high fusing function, and has solved the above problems.

[0009]

A method for producing a combustion gas suitable for fusing or brazing according to the first invention of the present application is a mixed gas of hydrogen and oxygen being produced by electrolyzing water or steam. By adding liquefied petroleum gas such as propane gas, ethylene gas or natural gas used for melting of steel to k1, the composition ratio of hydrogen, oxygen and liquefied petroleum gas exceeds the upper limit of combustion and explosion. Non-combustion and handling outside the explosion range are possible.

In the method for producing a combustion gas suitable for fusing or brazing according to the first aspect of the present invention, which employs the above means, the electrolysis of water or steam is performed on demand, that is, as needed, successively, inexpensive combustion is performed. It is possible to supply gas, and by adding liquefied petroleum gas that can also be used as a combustion gas to a mixed gas of oxygen and hydrogen produced by electrolysis, it is possible to generate oxygen and hydrogen by electrolysis of water. Stable handling is possible without changing the production ratio and outside the non-combustion and explosion range. That is, in particular, as a means of using electrolysis-produced gas of water as a fusing gas,
By adding a flammable gas, we kept it outside the explosive range and improved the fusing function. Therefore, the safety during manufacturing is remarkably improved, and the safety does not sacrifice the use efficiency as a combustion gas used for fusing or brazing for safety. In addition, compared with conventional combustion gas, it has the advantage that it can be cut at high speed and has good peeling property, while adding liquefied petroleum gas enables continuous operation, and delayed cracking is less likely to occur. I got the functional advantage.

The combustion gas suitable for fusing or brazing according to the second aspect of the present invention produces hydrogen and oxygen by electrolysis of water or steam, and adds liquefied petroleum gas such as natural gas to produce hydrogen, oxygen and The composition ratio of liquefied petroleum gas exceeds the upper limit of combustion and explosion, and is set to non-combustion and out of explosion range.

The combustion gas suitable for fusing or brazing according to the second aspect of the present invention, which employs the above means, can be safely handled without separating hydrogen and oxygen, and for safety, fusing or brazing. It does not sacrifice the efficiency of use as the combustion gas used for. In addition, compared with conventional combustion gas, it has the advantage that it can be cut at high speed and has good peeling property, while adding liquefied petroleum gas enables continuous operation, and delayed cracking is less likely to occur. I got the functional advantage.

In the method for producing a combustion gas suitable for fusing or brazing according to the third invention of the present application, the first combustible gas and the first combustible gas capable of reacting with the first combustible gas and exploding are supported. Mixing a second combustible gas having a reaction ratio with the above-mentioned combustion-supporting gas different from that of the first combustible gas to a mixed gas containing the combustible gas as a component and suitable for fusing or brazing In regard to the component ratio among at least three components of the first combustible gas, the combustion-supporting gas, and the second combustible gas, the upper limit of combustion and explosion shall be exceeded, and the first combustible gas and Even if the component ratio with the combustion-supporting gas is set to the above-described explosive ratio, it is characterized in that it can be handled outside the non-combustion and explosion range.

By adopting such means, the method for producing a combustion gas suitable for fusing or brazing according to the third invention of the present application, the composition ratio between the first combustible gas and the combustion supporting gas is As the above-mentioned explosive ratio with good combustion efficiency,
By mixing the second flammable gas, it became possible to handle the non-combustion and outside the explosion range. For this reason, the safety is remarkably improved, and for safety, the function of use in melting or brazing of the combustion gas is not deteriorated.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a gas generator 100 suitable for carrying out the present invention. This gas generator 1
00 is an electrolysis cell 1 capable of electrolyzing water by being connected to a power source 10, a gas generation chamber 2 connected to the electrolysis cell 1, a liquefied petroleum gas from the other inside the production chamber 2. And the combustion gas k that has been produced.
A lead-out pipe 4 for leading the gas from the generation chamber 2 to the outside, a mass flow meter (not shown), and a mass flow controller 5.

By applying an electrolysis voltage to the above-mentioned electrolysis cell 1 in which water is stored or water is supplied from the other by the power source 10, the water is decomposed into hydrogen and oxygen, and the hydrogen is generated in the gas generation chamber 2. A mixed gas k1 of oxygen and oxygen is generated. That is, by the electrolysis, a mixed gas k1 of hydrogen gas which is the first combustible gas and oxygen gas which is the combustion supporting gas is obtained. still,
1 d shows the electrolytic solution in the gas generation chamber 2. The mixed gas k1 is generated at a volume ratio of 2: 1 of hydrogen gas (single body): oxygen gas (single body) according to the number of hydrogen atoms and oxygen atoms in the water molecule. That is, the mixed gas k1 is 10
Assuming 0%, the single gas of hydrogen is about 66.7%.
%, Oxygen simple substance gas is about 33.3%, and the volume ratio is tightened.

During the generation of the mixed gas k1, the liquefied petroleum gas k2 is introduced into the generation chamber 2 through the outlet pipe 4 as the second combustible gas. The introduction amount of the liquefied petroleum gas k2 is obtained by reading the production amount of the mixed gas k1 by the above mass flow meter, and the mass flow controller 5 opening and closing the flow rate adjusting valve (preferably proportional injection valve) according to the read production amount of the mixed gas k1. Control and adjust. That is, by adjusting the mixing ratio (volume ratio) of the second combustible gas, that is, the liquefied petroleum gas k2 to the mixed gas k1, the gas composition of the combustion gas k is adjusted to the three components by adjusting the introduction amount by the mass flow controller 5. Keep outside the explosive range of the system. Combustion gas k generated in this way and suitable for fusing or brazing
Can be taken out from the outlet pipe 4 or directly supplied to a fusing torch (not shown).

As the above-mentioned second flammable gas, liquefied petroleum gas represented by propane gas, ethylene gas or natural gas is suitable as described above. However, a hydrocarbon-based combustion gas other than liquefied petroleum gas can be used as the second combustion gas, and the second combustion gas is not limited.

Next, referring to FIGS. 2 to 4, a mixed gas 1k
An example of the mixing ratio of 1 and the second combustible gas will be shown below as a suitable example found by the inventor of the present application after earnest research.
In the graphs shown in each of these figures, the region indicated by an ellipse indicates a practical range having a function suitable for fusing in the combustion gas k produced by the method according to the present invention, and the position indicated by a perfect circle is
The component ratio does not cause explosive combustion even with spark ignition.

FIG. 2A shows an example in which LPG is added as a second combustible gas to the mixed gas k1 of hydrogen gas and oxygen gas. In the graph shown in FIG. 2 (A), the vertical axis is
The volume ratio of hydrogen gas in the whole combustion gas k (100%) is shown, and the horizontal axis shows the volume ratio of LPG in the whole combustion gas k (100%). In this graph,
The vertical axis, the horizontal axis, and the hydrogen gas-LPG explosion upper limit line n1 are surrounded, and the vertical axis, the horizontal axis, and the hydrogen gas-LPG lower limit line (the diagonal line segment goes to the left, but the vertical axis The area h1 does not appear on this graph because all the ratios on the horizontal axis are small, and the area h1 is the explosion range. Therefore, it is considered that there is no danger of explosion if it is located in the upper right region of the upper limit line n1, but on the other hand, in terms of cost, it is desirable to minimize the proportion occupied by LPG. here,
Hydrogen / oxygen mixed gas-LPG composition line m1 and upper limit line n1
The intersection point with (25% LPG) and its vicinity are the most suitable compositions in terms of cost and safety. So in this case,
The elliptical region extending downward from the intersection on the composition line m1 is also the above-mentioned balanced composition range after the intersection. For this elliptical region, the LPG from the intersection on the composition line m1.
The upper limit is 35%. On the other hand, the position indicated by a perfect circle, that is, the region where the lower limit of LPG 20% from the intersection on the composition line m1 is
Although it originally belongs to the explosion region, it did not explode and burn even with spark ignition. Therefore, this area is the area where the cost can be kept the lowest and the safety can be ensured.

FIG. 2B shows an example in which ethylene gas is added as the second flammable gas to the mixed gas k1 of hydrogen gas and oxygen gas. In the graph shown in FIG. 2 (B), the vertical axis represents the volume ratio of hydrogen gas in the entire combustion gas k (100%), and the horizontal axis represents the entire combustion gas k (100%).
%) Shows the volume ratio of ethylene gas in the same. In this graph, a region h2 surrounded by the vertical axis, the horizontal axis, and the hydrogen gas-ethylene gas explosion upper limit line n2 is the explosion range. Therefore, it is considered that there is no danger of explosion if it is in the region on the upper right of the upper limit line n2. On the other hand, in terms of cost, the proportion occupied by ethylene gas should be minimized. Here, the intersection of the hydrogen / oxygen mixed gas-ethylene gas composition line m2 and the upper limit line n2 (ethylene gas 54%) and its vicinity are the most suitable compositions in terms of cost and safety.
Therefore, in this case, the region of the ellipse spreading downward from the intersection on the composition line m2 is also the above-mentioned balanced composition range after the intersection. For this elliptical region, the composition line m
2 From the upper intersection, the upper limit is 65% ethylene gas. on the other hand,
The position indicated by a perfect circle, that is, the region where the lower limit of ethylene gas is 49% from the intersection on the composition line m2 originally belongs to the explosion region, but it did not explode and burn even by spark ignition. Therefore, this area has the lowest cost,
This is an area where safety can be ensured.

FIG. 3 shows an example of adding methane gas as a second combustible gas to the mixed gas k1 of hydrogen gas and oxygen gas. In the graph shown in FIG. 3, the vertical axis represents the volume ratio of hydrogen gas in the entire combustion gas k (100%), and the horizontal axis represents the volume ratio of methane gas in the entire combustion gas k (100%). Show. In this graph,
The vertical axis, the horizontal axis, and the hydrogen gas-methane gas explosion upper limit line n3 are surrounded, and the vertical axis, the horizontal axis, and the hydrogen gas-methane gas lower limit line (the diagonal line segment goes up to the left, The area h3 does not appear on this graph because all the ratios on the horizontal axis are small, and the area h3 is the explosion range. Therefore, it is considered that there is no danger of explosion if it is in the upper right region of the upper limit line n2, but on the other hand, in terms of cost, it is desirable to minimize the proportion of methane gas. Here, the intersection of the hydrogen / oxygen mixed gas-methane gas composition line m3 and the upper limit line n3 (methane gas 25%) and its vicinity are the most suitable compositions in terms of cost and safety. Therefore, in this case, the region of the ellipse spreading downward from the intersection on the composition line m3 is also the above-mentioned balanced composition range after the intersection. For this elliptical region, the upper limit is 35% of methane gas from the intersection on the composition line m3. On the other hand, from the position indicated by a perfect circle, that is, the intersection on the composition line m3, the methane gas 20
The region with the lower limit of% originally belongs to the explosion region, but it did not explode and burn even by spark ignition. Therefore, this area is the area where the cost can be kept the lowest and the safety can be ensured.

FIG. 4A shows an example in which a blast furnace gas is added as a second combustible gas to the mixed gas k1 of hydrogen gas and oxygen gas. In the graph shown in FIG. 4 (A), the vertical axis represents the volume ratio of hydrogen gas in the entire combustion gas k (100%), and the horizontal axis represents the entire combustion gas k (100%).
The volume ratio of blast furnace gas in the inside is shown. In this graph, the vertical axis, the horizontal axis, hydrogen gas-blast furnace gas explosion upper limit line n
It is surrounded by 4 and the vertical axis, horizontal axis and hydrogen gas-blast furnace gas lower limit line (it is an oblique line segment rising to the left, but the ratio of both vertical axis and horizontal axis is small, so this graph The area h4 excluding the portion surrounded by (not shown above) is the explosion range. Therefore, it is considered that there is no danger of explosion if it is located in the area on the upper right of the upper limit line n4, but on the other hand, in terms of cost, it is desirable to minimize the proportion occupied by the blast furnace gas. Here, the intersection of the hydrogen / oxygen mixed gas-blast furnace gas composition line m4 and the upper limit line n4 (blast furnace gas 25%) and its vicinity are
It is the most suitable composition in terms of cost and safety. Therefore,
In this case, the elliptical region spreading downward from the intersection on the composition line m4 is also the above-mentioned balanced composition range, next to the intersection. The upper limit of this elliptical region is 40% of the blast furnace gas from the intersection on the composition line m4. On the other hand, the position indicated by a perfect circle, that is, the region having the lower limit of 20% of the blast furnace gas from the intersection on the composition line m4 originally belongs to the explosion region, but it did not explode and burn even by spark ignition. Therefore, this area is the area where the cost can be kept the lowest and the safety can be ensured.

FIG. 4B shows an example in which normal hexane is added as the second flammable gas to the mixed gas k1 of the hydrogen gas and the oxygen gas. In the graph shown in FIG. 4 (B), the vertical axis represents the volume ratio of hydrogen gas in the entire combustion gas k (100%), and the horizontal axis represents the entire combustion gas k (1
(00%) represents the volume ratio of normal hexane. In this graph, the vertical axis, the horizontal axis, surrounded by the hydrogen gas-normal hexane explosion upper limit line n5, and the vertical axis,
It is surrounded by the horizontal axis and the lower limit line of hydrogen gas-normal hexane (oblique line segments rising to the left, but the ratios of both the vertical axis and the horizontal axis are small, so they do not appear on this graph). The region h5 excluding the portion is the explosion range. Therefore, it is considered that there is no danger of explosion if it is in the region on the upper right of the upper limit line n5. On the other hand, in terms of cost, it is desirable to minimize the proportion occupied by normal hexane. here,
The intersection of the hydrogen / oxygen mixed gas-normal hexane composition line m5 and the upper limit line n5 (normal hexane 24%) and its vicinity are the most suitable compositions in terms of cost and safety. Therefore, in this case, the region of the ellipse spreading downward from the intersection on the composition line m5 is also the above-mentioned balanced composition range after the intersection. The upper limit of this elliptical region is 38% of normal hexane gas from the intersection on the composition line m5. On the other hand, the position indicated by a perfect circle, that is, the region where the lower limit of normal hexane is 19% from the intersection on the composition line m5 originally belongs to the explosion region, but it did not explode and burn even by spark ignition. Therefore, this area is the area where the cost can be kept the lowest and the safety can be ensured.

Therefore, in the examples shown in FIGS. 2 to 4, the intersections and the regions indicated by the perfect circles and ellipses are suitable for use as combustion gas for fusing. Notable points are
In any case, even if it is the area that enters the explosion area from the intersection with the explosion limit line on the composition line (the area of a perfect circle),
It is possible to use a combustion gas of 5% lower than the volume ratio at the intersection, that is, a volume ratio lower by 5 points. That is, for the second gas, it is possible to use up to 5 points, which is less than (or less than) the volume ratio of the intersections. In each of the above-described embodiments, a three-component system of hydrogen-oxygen-second combustible gas) is assumed (the ratio between hydrogen-oxygen is constant, so substantial electrolysis-generated gas-second combustible gas). Can be considered as a two-component system). However, it is also possible to carry out as a multi-component combustion gas rather than three components.

Next, LPG conventionally used as combustion gas
Single gas and combustion gas (aqua gas) according to the present invention
Tables 1 to 6 show the results of comparison of the fusing ability of the two. For comparison, a portable fusing device (Komatsu Seisakusho) was used.

[0027]

[Table 1] Data 1) Emphasis on surface roughness / SS material   Thick Plate Crater Cutting Oxygen LPG Aqua Gas     (mm) (No.) (Pressure K) (Speed mm / min) (Speed mm / min)   9 1 5 430 520 18 1 6 380 500 22 2 6 370 450 28 2 6 330 430 40 3 6 300 390

[0028]

[Table 2] Data 2) Speed-oriented / SS material   Thick Plate Crater Cutting Oxygen LPG Aqua Gas     (mm) (No.) (Pressure K) (Speed mm / min) (Speed mm / min)   9 1 − − − 19 1-380 530 252-360 450 322-330 400 50 3-200 300

[0029]

[Table 3] Data 3) Emphasis on surface roughness / SS material   Thick Plate Crater Cutting Oxygen LPG Aqua Gas     (mm) (No.) (Pressure K) (Speed mm / min) (Speed mm / min)   6 0 4 450 650 16 1 4 300 450 32 2 4 300 400 70 3 4 200 200

[0030]

[Table 4] Data 4) Emphasis on surface roughness / SS material   Thick Plate Crater Cutting Oxygen Crater Height Aqua Gas     (mm) (No.) (Pressure K) (mm) (Speed mm / min)   80 3 3.7 5-8 220 110 4 4 5-8 200 140 4 4 5-8 175 150 5 4 8-10 160

[0031]

[Table 5] Data 5) Zinc material (Zn)   Thick Plate Crater Cutting Oxygen LPG Aqua Gas     (mm) (No.) (Pressure K) (Speed mm / min) (Speed mm / min)   6 0 5 400 500   9 0 5 300 400 120 5 260 350 25 2 5 200 350

[0032]

[Table 6] Data 6) Piercing (drilling) / SS material   Plate crater Preheated oxygen LPG Aqua gas     (mm) (No.) (Pressure K) (Time second) (Time second)   9 1 1.8 21 10 18 1 1.8 41 17 22 2 1.8 45 28 28 2 1.8 60 40 40 3 1.8 101 60

The above data 1) and 3) are data when the SS materials of different manufacturers are melt-cut, with the surface roughness being emphasized. The data 2) is data when the SS material of a manufacturer different from the data 1) and 3) is blown, with emphasis on speed. The data 4) is the data when the SS material of the same manufacturer as that of the data 2) is blown, with emphasis on the surface roughness (however, the plate thickness is different). The data 5) is the data when the zinc material of the same manufacturer as the data 1) is blown. Data 6) is data when piercing (punching) SS material made by the same manufacturer as data 1). As can be seen from these data, the combustion gas (aqua gas) according to the present invention has a significantly reduced speed of fusing and punching of the SS material (data 1) to 3), as compared with LPG. . Such a result is the same as in the case of fusing the zinc material (Data 5). Also, SS
Also in the case of drilling a material, a reduction in time can be confirmed with the combustion gas (aqua gas) according to the present invention as compared with the LPG (Data 6)).

Next, the result of the confirmation test of the non-ignitable region of the combustible gas mixture by the aqua gas generator (Hydrogen / oxygen generator manufactured by Isplan Co., Ltd.) and AGM (Proportional mixer manufactured by Isplan Co., Ltd.) will be described. This experiment is based on the confirmation of the theoretical explosion limit shown in FIGS. 2 to 4, and the safety inside the apparatus of the proportional mixed combustion gas system by the aqua gas generator (hydrogen / oxygen generator) and AGM (proportional mixer). The purpose is to confirm (non-ignition composition). Explaining the apparatus and equipment used in the confirmation experiment of the non-ignition area of the combustible gas, the gas generating / mixing system (combustion gas manufacturing apparatus according to the present invention)
As, AGG-6500 (Aqua gas generator manufactured by Isplan Co., Ltd.) and AGM-130S
(Gas mixer manufactured by Isplan Co., Ltd.) was used in combination. Spark plug device is 15000V, 50mA
I used the one. Although not shown, it is preferable that the outlet pipe 4 be provided with a buffer tank for preventing backflow and stably supplying the generated gas. In this experiment, a buffer tank having a volume of 16 liters is used. Provided. Explaining the measuring instrument and the recording instrument used in this experiment, a strange gauge (C
KYOWA sensor), oscilloscope (CLeCroy930
4A20MHZesILLoscope) was used. For shooting, a Sony handheld video camera (Sony Handycam DCR / VX
1000) was used. The result of the confirmation experiment of the non-ignition region of the combustible gas mixture is as follows.

Take 1) Initial pressure: 1.33 kgf / square cm, final pressure: 1.33 kgf / square cm, LPG
Spark ignition was performed 3 times at a concentration of 21.9%. As a result, it did not ignite. Take 2) Initial pressure: 1.34kgf / square cm, Final pressure: 2.41kgf / square cm, LPG
Spark ignition was performed once at a concentration of 18.8%. As a result, there was ignition. Take 3) Initial pressure: 1.33kgf / square cm, Final pressure: 1.33kgf / square cm, LPG
Spark ignition was performed 3 times at a concentration of 20.9%. As a result, it did not ignite. Take 4) Initial pressure: 1.33 kgf / square cm, Final pressure: 2.43 kgf / square cm, LPG
Spark ignition was performed once at a concentration of 17.6%. As a result, there was ignition.

As described above, from the results of the four tests of takes 1) to 4), it is understood that the ignition does not occur until the LPG concentration: around 20%. That is, this supports the effect of the embodiment shown in the graph of FIG.

The analysis results of CO 2 (carbon dioxide) in the combustion gas according to the present invention will be described with reference to FIG. 5 and Table 7. FIG. 5: is explanatory drawing which shows the apparatus used for the analysis. Table 7 shows the analysis results. The purpose of this analysis is to measure and compare the carbon dioxide in the combustion gas at the time of melting by three types of gas (aqua gas, acetylene, LPG) (sample). A steel plate (fusing width 420 mm × thickness 30 mm) was used as the fusing material x1. In Figure 5, x2 is CO2
A meter is shown and x3 is a recorder. Also,
x4 indicates a gas sampling port of the CO2 meter x2, and x5 indicates a gas torch. The measurement was performed indoors. Regarding the measuring method, an infrared non-dispersion type was used, and as the measuring device, CGT-101A type manufactured by Shimadzu Corporation was used. The combustion gas sampling position and sampling port were measured and examined several times, and finally, as shown in FIG.
Gas was sampled and measured at the position indicated by. Since the influence of the heat convection of the gas and the suction condition of the air on the measured values were observed, the measurement was made three times for one gas type. Specifically, the fusing speed was 250 mm / min, the gas sampling port diameter x6 was 47 mm, the distance between the steel plate (fusing material x1) and the gas sampling port x4 was 15 mm, and the distance between the torch x5 and the gas sampling port x4 (center) was x8. Was 60 mm, and the measurement gas flow rate was 1 liter / min.

[0038]

[Table 7]                             CO2 (V / V,%) Gas type Number of measurements Maximum value Minimum value Average value (average of 3 times) Aquagas 1 2.5 1.7 1.9                 2 2.6 1.8 Same as above                 3 3.5 2.3 Same as above Acetylene 1 4.3 2.3 2.5                 2 4.7 2.5 Same as above                 3 4.3 2.6 Same as above LPG 1 7.7 4.3 3.5                 2 6.1 3.5 Same as above                 3 5.7 3.1 Same as above

As described above, LPG showed the highest generation of carbon dioxide and then acetylene, and the combustion gas (aqua gas) according to the present invention generated the lowest carbon dioxide.

As described above, the mixed gas of oxygen and hydrogen gas has an advantage that it can be cut at a high speed and has a good peeling property, but it has a disadvantage that it cannot be operated continuously and is not suitable as a countermeasure against delayed cracking. Although it has been said that there is a possibility that the implementation of the present invention will eliminate such concerns and realize a real machine. This time, for the purpose of introducing an actual machine into ISO1400, an apparatus for implementing the gas production method according to the present invention was introduced on a trial basis, and an evaluation test for about one month was conducted.
From the standpoint of both quality and productivity improvement, we have obtained the prospect of commercialization. Here, with reference to FIG. 6, the evaluation of the slag separation property of the combustion gas according to the present invention will be described.

First, FIG. 6 shows the evaluation of noro peelability according to the thickness of the melted sheet. In each of the pie charts shown in FIGS. 6 (A) to 6 (D), the portion y1 indicated by the spots indicates the proportion of those requiring a jig to remove the slag, and the solid portion y2 indicates the dot-like slag. The percentage of those that can be removed by hand is shown, the shaded portion y3 shows the percentage of those that can be removed by hand with a rod-shaped slag, and the shaded portion y4 shows the percentage of those that have no slag at all. FIG. 6 (A) shows a case where the plate thickness is 20 mm or less, y1 is 16%, y2 is 52%, y3 is 0%,
y4 was 32%. FIG. 6B shows the case where the plate thickness is larger than 20 mm, y1 is 6%, y2 is 46%,
y3 was 2% and y4 was 46%. FIG. 6 (C) shows the case of ordinary steel having a plate thickness of more than 21 mm and less than 30 mm, where y1 is 0%, y2 is 43%, y3 is 0%, y
4 was 57%. Figure 6 (D) shows the case of special steel (SS + Cr high tension steel) with a plate thickness of more than 21 mm and less than 30 mm, y1 is 0%, y2 is 52%.
%, Y3 was 7%, and y4 was 41%. Incidentally, FIG. 6 (A)
The fusing material of (B) is SS material (SS400).

In the above evaluation, when cutting was performed using COG gas (blast furnace gas), the ratio was about 50% or more.
Although a jig is required, 16% of the combustion gas (aqua gas) according to the present invention has a size of 20 mm or less.
6% when larger than mm, and Nolores ratio is 3
It is 0% to 50%, and the peeling property is good. In aqua gas, the ratio of nolores (no slag) is 57% in the case of ordinary steel and 41% in the case of special steel, which is slightly superior to ordinary steel.

The comprehensive evaluation is as follows. 1) Cutting speed: Very good (about 10 to 20 for thick materials)
%) 2) Occurrence of slag: Very good (approx. 50% of thick material achieves no slag) 3) Peelability: Very good (1 for thick material that requires a jig)
0% or less) 4) Infiltrated hydrogen: Good (same level as PCOG) 5) Flashback: Good (no worries) 6) Cutting environment: Extremely good (smoke generation is good) 7) Continuous operation: Good (automatic supply device introduced) 8) Running cost: Good (LPG: 5.0 yen / m, A
GG: 3.1 yen / m)

The cutting temperatures of the combustion gas and LPG according to the present invention were examined. Next, the measurement temperature at the time of cutting the combustion gas (aqua gas) according to the present invention will be shown. In addition, high-pressure oxygen of 2.5 kg / square cm was used in each case. 1) When the feed rate is 550 mm / min for SS material with a plate thickness of 6 mm, 129 ° C. 2) For SS material with a plate thickness of 12 mm, when feed rate is 400 mm / min, 158 ° C. 3) Plate thickness 108 ° C when the feed rate is 450 mm / min for 9 mm SS material

Under the conditions of 1) above, when LPG was used with water spray cooling using an eye tracer (cutting machine manufactured by Tanaka Seisakusho), the measurement temperature was 168.2 ° C. (measured after evaporation of water). Similarly, under the conditions of 1) above, when LPG was used without cooling (cutting without using water) using an eye tracer, the measurement temperature was 364.2 ° C. Thus, in the combustion gas according to the present invention, the measured temperature is LPG.
It is extremely low compared to the case of. In particular, when the combustion gas (aqua gas) according to the present invention is used, the cutting temperature is lower than that in the case of cutting with LPG + oxygen, so that thermal distortion is small and cooling water is unnecessary.

The gas according to the present invention has excellent properties, safety and economy as described above. Further, also for the fusing function surface, it is also possible to mix other hydrocarbon-based combustion gases in the non-combustion range to prepare a fusing gas having the required functionality.
Mixing using a proportional injection valve, mixing using a mass flow meter, and a mass flow controller can be considered.

[0047]

As described above, according to the first aspect of the present invention, a method for producing a combustion gas suitable for fusing or brazing is performed by electrolyzing water or water vapor on demand, that is, sequentially and inexpensively as needed. It is possible to supply gas,
In addition, it is possible to produce a combustion gas suitable for fusing or brazing, which is capable of safely and stably handling, without sacrificing combustion efficiency and imparting a high fusing function. As a result, the function of the combustion gas for fusing, which has not been developed so far, has been improved, and at the same time, the safety, cost and environment of manufacturing and handling can be improved. That is, the first invention of the present application improves the mixed gas of hydrogen and oxygen generated in the electrolyzer of water or steam to combine stable and excellent mixed combustion gas for fusing steel or brazing. A method for producing a mixed gas having the above can be provided. In particular, the present invention mixes hydrogen, oxygen and combustion gas obtained by electrolyzing water with the combustion gas used for melting the steel material so as to be outside the explosion limit, and has excellent melting function and economical characteristics. It was possible to provide a manufacturing method for producing a mixed gas having

Further, by carrying out the second invention of the present application, the combustion efficiency is high, and the fusing function is excellent, and the
It was possible to provide a combustion gas suitable for fusing or brazing, which enables stable handling. That is, regarding the combustion gas for fusing, which has not been seen to develop in the past, its function has been improved, and at the same time, safety and cost aspects of manufacturing and handling,
It was possible to provide an excellent combustion gas for the environment.

Further, by carrying out the third invention of the present application, even if the component ratio between the first combustible gas and the combustion-supporting gas is set to the above explosible ratio with good combustion efficiency, the second flammability By mixing the gas, it was possible to handle it outside the range of non-combustion and explosion. For this reason, the safety is remarkably improved, and for safety, the function of use in melting or brazing of the combustion gas is not deteriorated.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a gas producing apparatus suitable for carrying out the present invention.

FIG. 2A is an explanatory diagram showing one embodiment of a gas according to the present invention, and FIG. 2B is an explanatory diagram showing another embodiment.

FIG. 3 is an explanatory view showing still another embodiment of the gas according to the present invention.

FIG. 4A is an explanatory view showing another embodiment of the gas according to the present invention, and FIG. 4B is an explanatory view showing still another embodiment.

FIG. 5 is an analyzer used for measuring the amount of carbon dioxide generated for the gas according to the present invention and the gas of the comparative example.

FIG. 6 is an explanatory diagram of the noro peeling property of the gas according to the present invention.

[Explanation of symbols]

k1 (oxygen and hydrogen) mixed gas

Claims (3)

[Claims] 1. A liquefied petroleum gas, such as propane gas, ethylene gas or natural gas, which is used for melting a steel material against a mixed gas of hydrogen and oxygen which is being produced by electrolyzing water or water vapor. By adding hydrogen, oxygen, and liquefied petroleum gas component ratios, the upper limits of combustion and explosion are exceeded, and combustion gas suitable for fusing or brazing that enables non-combustion and handling outside the explosion range Production method. 2. Hydrogen and oxygen are generated by electrolysis of water or water vapor, and liquefied petroleum gas such as natural gas is added, and the component ratio of hydrogen, oxygen and liquefied petroleum gas is
Combustion gas suitable for fusing or brazing characterized by exceeding the upper limits of combustion and explosion and being out of the range of non-combustion and explosion. 3. A mixed gas suitable for fusing or brazing, comprising a first combustible gas and a combustion-supporting gas capable of exploding in response to the first combustible gas as components. By mixing the second combustible gas having a reaction ratio with the above-mentioned combustible gas different from that of the first combustible gas, the first combustible gas, the combustible gas, and the second combustible gas are mixed. Regarding the component ratio between at least three components with the volatile gas, the upper limit of combustion and explosion shall be exceeded, and the component ratio between the first combustible gas and the combustion supporting gas shall be the above explosive ratio. A method for producing a combustion gas suitable for fusing or brazing, characterized in that it is non-combustible and can be handled outside the range of explosion.