WO2010032376A1 - ガス切断方法及びガス切断装置 - Google Patents
ガス切断方法及びガス切断装置 Download PDFInfo
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- WO2010032376A1 WO2010032376A1 PCT/JP2009/003946 JP2009003946W WO2010032376A1 WO 2010032376 A1 WO2010032376 A1 WO 2010032376A1 JP 2009003946 W JP2009003946 W JP 2009003946W WO 2010032376 A1 WO2010032376 A1 WO 2010032376A1
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- WIPO (PCT)
- Prior art keywords
- gas
- cutting
- oxygen
- preheating
- hole
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/38—Torches, e.g. for brazing or heating
- F23D14/42—Torches, e.g. for brazing or heating for cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K7/00—Cutting, scarfing, or desurfacing by applying flames
- B23K7/008—Preliminary treatment
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/32—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid using a mixture of gaseous fuel and pure oxygen or oxygen-enriched air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K5/00—Feeding or distributing other fuel to combustion apparatus
- F23K5/002—Gaseous fuel
- F23K5/007—Details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
- F23N3/005—Regulating air supply or draught using electrical or electromechanical means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2900/00—Special features of, or arrangements for combustion apparatus using fluid fuels or solid fuels suspended in air; Combustion processes therefor
- F23C2900/9901—Combustion process using hydrogen, hydrogen peroxide water or brown gas as fuel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2400/00—Pretreatment and supply of gaseous fuel
- F23K2400/20—Supply line arrangements
- F23K2400/201—Control devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23K—FEEDING FUEL TO COMBUSTION APPARATUS
- F23K2900/00—Special features of, or arrangements for fuel supplies
- F23K2900/05004—Mixing two or more fluid fuels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2237/00—Controlling
- F23N2237/08—Controlling two or more different types of fuel simultaneously
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2241/00—Applications
- F23N2241/11—Torches
Definitions
- the present invention relates to a gas for cutting a work by a cutting crater provided with a preheating hole for forming a preheating flame with fuel gas and preheating oxygen gas, and a cutting oxygen hole for injecting cutting oxygen gas to cut the work.
- the present invention relates to a cutting method and a gas cutting device.
- the cutting start point of the workpiece is heated to a temperature at which an oxidation reaction can be performed by a preheating flame of the preheating hole, and high-purity oxygen gas is cut from the cut oxygen hole to the heated portion.
- a gas cutting method is widely used in which a workpiece is cut by injecting, burning, and melting.
- a hydrocarbon-based gas and an oxygen gas as fuel gas are supplied to the preheating hole and burned as a preheating flame both in the case of heating the workpiece at the cutting start point and at the time of cutting the workpiece.
- hydrogen gas is used instead of hydrocarbon-based gas (for example, refer to Patent Document 1).
- the present invention has been made in view of such circumstances, and a cutting crater provided with a preheating hole for forming a preheating flame with fuel gas and preheating oxygen gas, and a cutting oxygen hole for injecting cutting oxygen gas.
- Gas cutting method and gas cutting method that can reduce the consumption of hydrogen gas by supplying suitable fuel gas to the preheating hole when the workpiece is heated and when the workpiece is cut.
- the invention according to claim 1 is a gas cutting by a cutting crater provided with a preheating hole for forming a preheating flame with fuel gas and preheating oxygen gas, and a cutting oxygen hole for injecting cutting oxygen gas to cut a workpiece.
- an oxygen gas is provided in a cutting crater provided with a preheating hole for forming a preheating flame with fuel gas and preheating oxygen gas, and a cutting oxygen hole for injecting cutting oxygen gas to cut a workpiece.
- a gas cutting device for supplying the fuel gas and the oxygen gas comprising an oxygen gas supply circuit, a hydrogen gas supply circuit, a hydrocarbon gas supply circuit, and a gas supply control means.
- the oxygen gas supply circuit, the hydrogen gas supply circuit, and the hydrocarbon gas supply circuit are connected to each other, and the flow rate of hydrogen gas from the hydrogen gas supply circuit and the hydrocarbon from the hydrocarbon gas supply circuit
- the flow rate of the system gas can be changed
- the oxygen gas supply circuit is connected to the cutting oxygen hole
- the gas supply control means is configured to heat the workpiece and to cut the workpiece.
- the is configured to change the ratio of hydrogen gas and the hydrocarbon gas to be supplied to.
- the ratio of the hydrogen gas and the hydrocarbon-based gas with respect to the fuel gas supplied to the preheating hole is changed between when the workpiece is heated and when the workpiece is cut. It is possible to form a preheating flame suitable for each of the cutting and reduce the consumption of hydrogen gas.
- the hydrogen gas, hydrocarbon gas (including simple substance gas), and oxygen gas described in this specification do not necessarily mean 100% purity, and contain industrially unavoidable impurities and the like. It is not intended to exclude things.
- invention of Claim 2 is the gas cutting method of Claim 1, Comprising: When heating the said workpiece
- the invention according to claim 11 is the gas cutting device according to claim 10, wherein the gas supply control means, when heating the workpiece, the hydrogen gas or the hydrogen gas and the hydrocarbon system. A mixed gas mixed with a gas is supplied to the preheating hole as the fuel gas.
- the gas cutting method and the gas cutting device when heating a workpiece, hydrogen gas or a fuel gas in which hydrogen gas and hydrocarbon-based gas are mixed is supplied to the preheating hole. Necessary heat can be efficiently secured.
- Invention of Claim 3 is the gas cutting method of Claim 2, Comprising: The mixing ratio of the said hydrocarbon gas to the said hydrogen gas is 30% or less by volume ratio, It is characterized by the above-mentioned. .
- the invention of Claim 12 is the gas cutting device of Claim 11, Comprising:
- the said gas supply control means makes the mixing ratio of the said hydrocarbon gas to the said hydrogen gas 30% or less by volume ratio It is comprised so that it may adjust to.
- the consumption of hydrogen gas can be reduced while improving the productivity as compared with the hydrocarbon-based gas.
- Invention of Claim 4 is the gas cutting method of Claim 2, Comprising: The mixing ratio of the said hydrocarbon gas to the said hydrogen gas is 10% or less by volume ratio, It is characterized by the above-mentioned. .
- the gas cutting method according to the present invention it is possible to reduce hydrogen gas while ensuring productivity substantially equal to that of hydrogen gas.
- Invention of Claim 5 is the gas cutting method of any one of Claim 2-4, Comprising: When cutting
- the gas cutting method according to the present invention it is possible to eliminate the consumption of hydrogen gas while securing the thermal energy necessary for cutting.
- Invention of Claim 6 is the gas cutting method of any one of Claim 2-4, Comprising: When cutting
- the gas cutting method according to the present invention it is possible to reduce the consumption of hydrogen gas while ensuring the thermal energy necessary for cutting.
- the invention according to claim 7 is the gas cutting method according to any one of claims 2 to 6, wherein the hydrocarbon-based gas is LPG.
- the invention according to claim 8 is the gas cutting method according to any one of claims 2 to 6, wherein the hydrocarbon-based gas is propane gas.
- the invention according to claim 9 is the gas cutting method according to any one of claims 2 to 6, wherein the hydrocarbon-based gas is butane gas.
- the gas cutting method and the gas cutting device it is possible to form a preheating flame suitable for each of heating and cutting and reduce the consumption of hydrogen gas by sufficiently securing the amount of heat during heating. Can do.
- FIG. 1 is a diagram showing a gas cutting system 1 according to the first embodiment.
- Reference numeral 20 indicates a cutting crater
- reference numeral 30 indicates a gas cutting device
- the gas cutting device 30 includes oxygen gas, fuel gas, and the like. Is supplied to the cutting crater 20.
- the cutting crater 20 includes, for example, a cutting oxygen hole 22 opened in the center of one end face of the cutting crater body formed in a rod shape, and a preheating hole 23 formed so as to surround the cutting oxygen hole 22.
- Fuel gas and oxygen gas are supplied to the preheating hole 23, and oxygen gas is supplied to the cutting oxygen hole 22 from the gas cutting device 30, respectively, and the workpiece is heated by a preheating flame, and the cutting oxygen hole 22 is heated in the heated portion.
- the workpiece is cut (including piercing) by injecting oxygen gas.
- disconnection oxygen hole in a cutting crater is not limited to this embodiment.
- the gas cutting device 30 includes a fuel gas supply circuit 40, an oxygen gas supply circuit 50, and a control unit (gas supply control means) 60.
- the fuel gas supply circuit 40 and the oxygen gas supply circuit 50 are respectively connected to a cutting crater 20. It is connected to the.
- the fuel gas supply circuit 40 includes a hydrogen gas supply circuit 41 and a propane gas supply circuit 45.
- the hydrogen gas supply circuit 41 is connected to a hydrogen gas supply source Sh such as a hydrogen gas tank, for example, and is arranged in the order of the hydrogen gas supply source Sh, the pressure adjustment valve 41P, and the hydrogen gas electromagnetic valve 42, and is controlled by the control unit 60.
- the hydrogen gas solenoid valve 42 is opened and closed by a signal to control the flow of hydrogen gas.
- the propane gas supply circuit 45 is connected to a propane gas supply source Sp such as a propane gas tank, for example, and is arranged in the order of the propane gas supply source Sp, the pressure adjustment valve 45P, and the propane gas electromagnetic valve 46, and is controlled by the control unit 60.
- the propane gas solenoid valve 46 is opened and closed by a signal to control the flow of propane gas.
- the oxygen gas supply circuit 50 includes a preheated oxygen gas supply circuit 51 connected to the preheat hole 23 and a cut oxygen gas supply circuit 55 connected to the cut oxygen hole 22, for example, an oxygen gas supply source such as an oxygen gas tank Each is connected to So.
- the preheating oxygen gas supply circuit 51 is arranged in the order of the oxygen gas supply source So, the pressure adjustment valve 51P, and the preheating oxygen electromagnetic valve 52.
- the preheating oxygen electromagnetic valve 52 is opened by a control signal from the control unit 60, the preheating oxygen oxygen valve 52 is opened. Gas is supplied to the preheating hole 23.
- the preheated oxygen gas supply circuit 51 is provided with a preheated oxygen high circuit 53 so as to supply high-pressure oxygen gas to the preheat hole 23 during heating and piercing.
- the preheated oxygen high circuit 53 is disposed between the oxygen gas supply source So and the preheated oxygen electromagnetic valve 52, and is disposed in the order of the oxygen gas supply source So, the pressure regulating valve 53P, and the preheated oxygen high electromagnetic valve 54, and the control unit 60.
- the preheated oxygen high solenoid valve 54 is opened by the control signal from, oxygen gas via the preheated oxygen high circuit 53 is supplied to the preheat hole 23. Such a control signal is output at the time of workpiece heating and piercing.
- the cut oxygen supply circuit 55 includes a pressure adjustment valve 55P and a cut oxygen electromagnetic valve 56.
- the pressure adjustment valve 55P and the cut oxygen electromagnetic valve 56 are arranged in this order from the oxygen gas supply source So to the oxygen gas supply source So.
- the cut oxygen hole 22 is connected. Further, the cutting oxygen supply circuit 55 controls the flow of oxygen gas to the cutting oxygen hole 22 by opening and closing the cutting oxygen electromagnetic valve 56 by a control signal from the control unit 60.
- the control unit 60 outputs a control signal to each corresponding electromagnetic valve in response to signals indicating a heating process, a piercing process, and a cutting process instructed by a program, etc. Gas is supplied to the cutting crater 20.
- a broken line connecting the control unit 60 and each solenoid valve shown in FIG. 1 indicates a signal cable for sending a control signal from the control unit 60 to each solenoid valve.
- the hydrogen gas electromagnetic valve 42 of the hydrogen gas supply circuit 41 is opened by the control signal from the control unit 60 and the preheating oxygen electromagnetic valve 52 of the preheating oxygen gas supply circuit 51 and the preheating oxygen high electromagnetic valve 54 of the preheating oxygen high circuit 53 are opened.
- Hydrogen gas and preheating oxygen gas are supplied to the preheating holes 23.
- the hydrogen gas and the preheating oxygen gas burn in the preheating holes 23 to form a preheating flame, and the work is heated by the preheating flame.
- the hydrogen gas electromagnetic valve 42 of the hydrogen gas supply circuit 41 is opened by the control signal from the control unit 60 and the preheating oxygen electromagnetic valve 52 of the preheating oxygen gas supply circuit 51 and the preheating oxygen high electromagnetic valve 54 of the preheating oxygen high circuit 53 are opened and preheated. Hydrogen gas and preheating oxygen gas are supplied to the holes 23. Further, the cutting oxygen solenoid valve 56 of the cutting oxygen supply circuit 55 is opened by the control signal from the control unit 60 and the cutting oxygen gas is supplied to the cutting oxygen hole 22.
- the propane gas electromagnetic valve 46 of the propane gas supply circuit 45 is opened by the control signal from the control unit 60 and the preheating oxygen electromagnetic valve 52 is opened to supply propane gas and oxygen gas to the preheating hole 23.
- the preheated oxygen high solenoid valve 54 is closed.
- the cutting oxygen supply valve 55 of the cutting oxygen supply circuit 55 is opened to supply cutting oxygen gas to the cutting oxygen hole 22.
- the hydrogen gas and the propane gas constituting the fuel gas supplied to the preheating hole 23 are switched at the time of heating the workpiece, piercing the workpiece, and cutting the workpiece (the ratio is changed). ), A preheating flame suitable for heating, piercing, and cutting can be formed. As a result, it is possible to reduce the consumption of hydrogen gas while ensuring the necessary thermal energy.
- the work can be efficiently heated, pierced, and cut together with the preheating flame.
- the preheating hole 23 since the supply of the cutting oxygen gas to the cutting oxygen hole 22 is switched by heating, piercing, and cutting, the work can be efficiently heated, pierced, and cut together with the preheating flame.
- FIG. 3 is a diagram showing a gas cutting system 2 according to the second embodiment, and reference numeral 70 indicates a gas cutting device.
- the gas cutting device 70 is different from the gas cutting device 30 in that the supply of hydrogen gas and propane gas is controlled by opening and closing the hydrogen gas electromagnetic valve 42 and the propane gas electromagnetic valve 46 in the gas cutting device 30.
- the supply of hydrogen gas and propane gas can be controlled steplessly by a mass flow controller provided in the hydrogen gas supply circuit 81 and the propane gas supply circuit 85 of the fuel gas supply circuit 80. Since others are the same as that of the gas cutting apparatus 30, the same code
- the gas cutting device 70 includes a fuel gas supply circuit 80, an oxygen gas supply circuit 50, and a control unit (gas supply control means) 61.
- the fuel gas supply circuit 80 includes a hydrogen gas supply circuit 81, a propane gas supply circuit 85, a mixing device 88, and a fuel gas electromagnetic valve 89.
- the hydrogen gas supply circuit 81 and the propane gas supply circuit 85 are arranged in parallel.
- Each downstream side is connected to the mixing device 88.
- the mixing device 88 is connected to the cutting crater 20 on the downstream side, and a fuel gas solenoid valve 89 is provided between the mixing device 88 and the cutting crater 20 to control the flow of the fuel gas.
- the hydrogen gas supply circuit 81 includes a mass flow controller 82 and a hydrogen gas electromagnetic valve 83, and the upstream side is connected to a hydrogen gas supply source Sh.
- the mass flow controller 82 and the hydrogen gas electromagnetic valve 83 are arranged in this order from the hydrogen gas supply source Sh.
- the downstream side is connected to the mixing device 88.
- the propane gas supply circuit 85 includes a mass flow controller 86 and a propane gas electromagnetic valve 87, and the upstream side is connected to the propane gas supply source Sp.
- the mass flow controller 86 and the propane gas electromagnetic valve 87 are connected to the propane gas supply source Sp. Arranged in order, the downstream side is connected to the mixing device 88.
- the control unit 61 controls the openings of the mass flow controller 82 and the mass flow controller 86, and opens and closes the hydrogen gas solenoid valve 83, the propane gas solenoid valve 87, and the fuel gas solenoid valve 89 to open and close the hydrogen gas and propane gas.
- the distribution is controlled.
- the gas cutting device 70 controls the opening amounts of the mass flow controllers 82 and 86 by a control signal from the control unit 61 to control the flow rate of hydrogen gas in the hydrogen gas supply circuit 81 and the flow rate of propane gas in the propane gas supply circuit 85.
- the mixing ratio (volume ratio) of propane gas to hydrogen gas can be adjusted. As a result, when heating the workpiece, when piercing, when cutting, hydrogen gas, propane gas, or mixed fuel gas is supplied to the preheating hole 23 and the mixing ratio (volume ratio) of hydrogen gas and propane gas is set. It can be adjusted.
- Openings of the mass flow controller 82 and the mass flow controller 86 are controlled by control signals from the control unit 61, and the hydrogen gas electromagnetic valve 83 and the propane gas electromagnetic valve 87 are opened and closed corresponding to the mass flow controllers 82 and 86, respectively.
- Gas either hydrogen gas, propane gas, or a mixed gas in which hydrogen gas and propane gas are mixed
- the fuel gas solenoid valve 89 is opened.
- the preheating oxygen electromagnetic valve 52 of the preheating oxygen gas supply circuit 51 and the preheating oxygen high electromagnetic valve 54 of the preheating oxygen high circuit 53 are opened by the control signal from the control unit 61 to supply hydrogen gas and preheating oxygen gas to the preheating hole 23. Supply.
- the fuel gas and the preheating oxygen gas burn in the preheating hole 23 to form a preheating flame, and the work is heated by the preheating flame.
- the opening degree of the mass flow controller 82 and the mass flow controller 86 is controlled by the control signal from the control unit 61, and the hydrogen gas electromagnetic valve 83 and the propane gas electromagnetic valve 87 are opened and closed corresponding to the mass flow controllers 82 and 86, respectively.
- Hydro gas electromagnetic valve 83 and the propane gas electromagnetic valve 87 are opened and closed corresponding to the mass flow controllers 82 and 86, respectively.
- propane gas, or a mixed gas in which hydrogen gas and propane gas are mixed is supplied to the preheating hole 23 through the fuel gas solenoid valve 89. At this time, the fuel gas solenoid valve 89 is opened.
- the hydrogen gas electromagnetic valve 83 of the hydrogen gas supply circuit 81 is opened by the control signal from the control unit 61, and the preheating oxygen electromagnetic valve 52 of the preheating oxygen gas supply circuit 51 and the preheating oxygen high electromagnetic valve 54 of the preheating oxygen high circuit 53 are turned on. Hydrogen gas and preheating oxygen gas are supplied to the opening preheating hole 23. Further, the cutting oxygen electromagnetic valve 56 of the cutting oxygen supply circuit 55 is opened by the control signal from the control unit 61 to supply cutting oxygen gas to the cutting oxygen hole 22.
- the fuel gas and the preheating oxygen gas are combusted in the preheating hole 23 to form a preheating flame, the work is heated, and the cutting oxygen gas is injected from the cutting oxygen hole 22 into the heated portion to pierce. Done.
- the opening of the mass flow controller 82 is made zero by the control signal from the control unit 61, the hydrogen gas electromagnetic valve 83 is closed, the mass flow controller 86 is controlled to the set opening, and the propane gas electromagnetic valve 87 is opened. Then, propane gas is supplied to the preheating hole 23 via the fuel gas solenoid valve 89. At this time, the fuel gas solenoid valve 89 is opened. Further, the hydrogen gas electromagnetic valve 83 of the hydrogen gas supply circuit 81 is opened by the control signal from the control unit 61 to supply the preheating oxygen gas to the preheating hole 23. At the time of cutting, the preheated oxygen high solenoid valve 54 is closed.
- the cutting oxygen supply valve 55 of the cutting oxygen supply circuit 55 is opened to supply cutting oxygen gas to the cutting oxygen hole 22.
- propane gas and oxygen gas are combusted in the preheating hole 23 to form a preheating flame and the work is heated, and cutting oxygen gas is injected from the cutting oxygen hole 22 into the heated portion to cut the work. Done.
- the mixing ratio of propane gas to hydrogen gas When adjusting the mixing ratio of propane gas to hydrogen gas to 30% or less at the time of heating and piercing, the consumption of hydrogen gas is reduced while securing the thermal energy of the preheating flame necessary for heating the workpiece. This is preferable.
- the mixing ratio of hydrocarbon gas to hydrogen gas is adjusted to 10% or less by volume, it is possible to reduce the hydrogen gas while ensuring a heating power substantially equal to that of hydrogen gas. Is preferred.
- the gas cutting device 70 when the workpiece is cut, a mixed gas of hydrogen gas and propane gas is supplied to the preheating hole 23 as a fuel gas, so that it is possible to reduce the consumption of hydrogen gas while ensuring the thermal energy necessary for cutting. it can.
- this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of invention.
- propane gas is used as the hydrocarbon-based gas.
- LPG liquefied petroleum gas
- propane gas LPG (liquefied petroleum gas)
- propane gas LPG (liquefied petroleum gas)
- propane gas LPG (liquefied petroleum gas)
- propane gas LPG (liquefied petroleum gas)
- propane gas LPG (liquefied petroleum gas)
- butane gas propane gas
- a gas in which at least one of them is mixed may be used as the fuel gas.
- hydrocarbon gases other than propane gas, LPG and butane gas, or a mixed gas thereof may be used.
- the hydrogen gas supply source, the propane gas supply source, and the oxygen gas supply source are gas tanks.
- the gas tank may be constituted by other supply sources, for example, by electrolyzing water.
- a hydrogen generator that generates oxygen gas and hydrogen gas may be used as a hydrogen gas supply source.
- a time gap may be provided by wrapping the switching timing of a plurality of solenoid valves or providing a time lag.
- the horizontal axis indicates the amount of combustion heat (MJ / h) in gas cutting
- the vertical axis indicates the shortest piercing time (seconds).
- the shortest piercing time means the shortest time from the start of heating until cutting oxygen is blown and the heated part undergoes an oxidation reaction (combustion), that is, the shortest time from the start of heating to the temperature at which the oxidation reaction takes place. ing. In industrial terms, it can be said that the smaller the amount of combustion heat on the horizontal axis, the shorter the shortest piercing time on the vertical axis.
- the shortest piercing time compared with propane gas at a heat input of 50 is about 30% in the case of a mixed gas of 30% propane gas + 70% hydrogen gas, and 10% propane gas + 70. It can be seen that in the case of a mixed gas of% hydrogen gas, it is shortened by about 65%, and a great effect can be obtained. As described above, when 30% propane gas was mixed with hydrogen gas, it was confirmed that the consumption of hydrogen gas could be reduced while ensuring the necessary thermal energy.
- the gas cutting method and the gas cutting device it is possible to form a preheating flame suitable for each of heating and cutting and reduce the consumption of hydrogen gas by sufficiently securing the amount of heat during heating. Therefore, it is extremely useful industrially.
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Abstract
Description
本願は、2008年9月16日に、日本に出願された特願2008-236703号に基づき優先権を主張し、その内容をここに援用する。
かかるガス切断方法では、切断開始点でのワーク加熱時とワーク切断時のいずれの場合にも予熱孔に燃料ガスとしての炭化水素系ガスと酸素ガスを供給して予熱炎として燃焼させていたが、近年、炭化水素系ガスに代えて水素ガスを用いることが行なわれている(例えば、特許文献1参照。)。
しかしながら、上記方法によれば、ワークを加熱する場合に予熱孔に多くの水素ガスを供給することが必要でありコスト的にも不利であるという問題がある。
そこで、予熱炎によりワークを加熱する際に、ワークを充分に加熱することが可能でコスト的にも有効な技術的手段に対する要請が高まっている。
請求項1に記載の発明は、燃料ガスと予熱用酸素ガスにより予熱炎を形成する予熱孔と、切断用酸素ガスを噴射してワークを切断する切断酸素孔とを備えた切断火口によるガス切断方法であって、水素ガスと炭化水素系ガスの少なくともいずれかを含んで構成された前記燃料ガスを用いて、前記ワークを加熱する場合と前記ワークを切断する場合とで、前記予熱孔に供給する前記水素ガスと前記炭化水素系ガスの比率を変更することを特徴とする。
なお、この明細書に記載された水素ガス、炭化水素系ガス(単体ガスを含む)、酸素ガスは、必ずしも純度100%を意味しておらず、工業的に許容される不可避不純物等を含有するものを除外する趣旨ではない。
請求項11に記載の発明は、請求項10に記載のガス切断装置であって、前記ガス供給制御手段は、前記ワークを加熱する場合に、前記水素ガス、又は前記水素ガスと前記炭化水素系ガスとを混合した混合ガスを、前記燃料ガスとして前記予熱孔に供給するように構成されていることを特徴とする。
図1は、第1の実施形態に係るガス切断システム1を示す図であり、符号20は切断火口を、符号30はガス切断装置を示しており、ガス切断装置30は酸素ガスと燃料ガスとを切断火口20に供給するようになっている。
切断火口20は、例えば、棒状に形成された切断火口本体の一方側端面の中央部に開口する切断酸素孔22と、この切断酸素孔22の周囲を囲むように形成された予熱孔23とを備え、予熱孔23には燃料ガスと酸素ガスが、切断酸素孔22には酸素ガスが、それぞれガス切断装置30から供給され、予熱炎によりワークを加熱し、加熱された部分に切断酸素孔22から酸素ガスを噴射してワークを切断(ピアシングを含む)ようになっている。
なお、切断火口における予熱孔と切断酸素孔の構成(それぞれの数、位置関係等)は、この実施形態に限定されないことはいうまでもない。
燃料ガス供給回路40は、水素ガス供給回路41と、プロパンガス供給回路45とを備えている。
水素ガス供給回路41は、例えば、水素ガスタンク等の水素ガス供給源Shに接続され、水素ガス供給源Shから圧力調整弁41P、水素ガス電磁弁42の順に配置されていて制御部60からの制御信号で水素ガス電磁弁42が開閉されて水素ガスの流通が制御されるようになっている。
プロパンガス供給回路45は、例えば、プロパンガスタンク等のプロパンガス供給源Spに接続され、プロパンガス供給源Spから圧力調整弁45P、プロパンガス電磁弁46の順に配置されていて制御部60からの制御信号でプロパンガス電磁弁46が開閉されてプロパンガスの流通が制御されるようになっている。
酸素ガス供給回路50は、予熱孔23に接続される予熱酸素ガス供給回路51と、切断酸素孔22に接続される切断酸素ガス供給回路55とを備え、例えば、酸素ガスタンク等の酸素ガス供給源Soにそれぞれ接続されている。
予熱酸素High回路53は、酸素ガス供給源Soと予熱酸素電磁弁52の間に配置され、酸素ガス供給源Soから圧力調整弁53P、予熱酸素High電磁弁54の順に配置されていて制御部60からの制御信号により予熱酸素High電磁弁54が開かれると予熱酸素High回路53を経由した酸素ガスが予熱孔23に供給されるようになっている。かかる制御信号はワーク加熱時とピアシング時に出力されるようになっている。
〔ワーク加熱時〕
制御部60からの制御信号によって水素ガス供給回路41の水素ガス電磁弁42を開くとともに予熱酸素ガス供給回路51の予熱酸素電磁弁52及び予熱酸素High回路53の予熱酸素High電磁弁54を開いて予熱孔23に水素ガス及び予熱用酸素ガスを供給する。
その結果、予熱孔23で水素ガスと予熱用酸素ガスが燃焼して予熱炎が形成され、この予熱炎によりワークが加熱される。
制御部60からの制御信号によって水素ガス供給回路41の水素ガス電磁弁42を開くとともに予熱酸素ガス供給回路51の予熱酸素電磁弁52及び予熱酸素High回路53の予熱酸素High電磁弁54を開き予熱孔23に水素ガス及び予熱用酸素ガスを供給する。
また、制御部60からの制御信号によって切断酸素供給回路55の切断酸素電磁弁56が開かれ切断酸素孔22に切断用酸素ガスを供給する。
その結果、予熱孔23で水素ガスと予熱用酸素ガスが燃焼して予熱炎が形成されてワークが加熱されるとともに加熱された部分に切断酸素孔22から切断用酸素ガスが噴射されてピアシングが行なわれる。
制御部60からの制御信号によってプロパンガス供給回路45のプロパンガス電磁弁46を開くとともに予熱酸素電磁弁52を開いて予熱孔23にプロパンガスと酸素ガスを供給する。切断時には予熱酸素High電磁弁54は閉じられる。
また、切断酸素供給回路55の切断酸素電磁弁56を開いて切断酸素孔22に切断用酸素ガスを供給する。
その結果、予熱孔23でプロパンガスと酸素ガスが燃焼して予熱炎が形成されてワークが加熱されるとともに加熱された部分に切断酸素孔22から切断用酸素ガスが噴射されてワークの切断が行なわれる。
その結果、必要な熱エネルギーを確保しつつ水素ガスの消費を削減することができる。
その結果、ワークを切断する場合に、予熱孔23にプロパンガスのみを供給することにより切断時に必要な熱エネルギーを確保しつつワーク切断における水素ガスの供給を不要にすることができる。
図3は、第2の実施形態に係るガス切断システム2を示す図であり、符号70はガス切断装置を示している。
ガス切断装置70がガス切断装置30と異なるのは、ガス切断装置30では水素ガス電磁弁42及びプロパンガス電磁弁46の開閉により水素ガス及びプロパンガスの供給が制御されていたのに対して、ガス切断装置70では水素ガス及びプロパンガスの供給が燃料ガス供給回路80の水素ガス供給回路81及びプロパンガス供給回路85に設けられたマスフローコントローラにより無段階に制御可能とされている点である。その他はガス切断装置30と同様であるため、同一の符号を付して説明を省略する。
また、プロパンガス供給回路85は、マスフローコントローラ86とプロパンガス電磁弁87とを備え、上流側がプロパンガス供給源Spに接続され、マスフローコントローラ86、プロパンガス電磁弁87はプロパンガス供給源Spからこの順に配置されて下流側が混合装置88に接続されている。
その結果、ワークを加熱する場合、ピアシングする場合、切断する場合において、水素ガス、プロパンガス、又は混合された燃料ガスを予熱孔23に供給するとともに水素ガスとプロパンガス混合比(体積比率)を調整することができるようになっている。
〔ワーク加熱時〕
制御部61からの制御信号によってマスフローコントローラ82及びマスフローコントローラ86の開度がそれぞれ制御されるとともに、マスフローコントローラ82、86に対応して水素ガス電磁弁83、プロパンガス電磁弁87が開閉され、燃料ガス(水素ガス、プロパンガス、又は水素ガスとプロパンガスが混合された混合ガスのいずれか)が燃料ガス電磁弁89を介して予熱孔23に供給される。このとき燃料ガス電磁弁89は、開かれている。
また、制御部61からの制御信号によって予熱酸素ガス供給回路51の予熱酸素電磁弁52及び予熱酸素High回路53の予熱酸素High電磁弁54を開いて予熱孔23に水素ガス及び予熱用酸素ガスを供給する。
その結果、予熱孔23で燃料ガスと予熱用酸素ガスが燃焼して予熱炎が形成され、この予熱炎によりワークが加熱される。
制御部61からの制御信号によってマスフローコントローラ82及びマスフローコントローラ86の開度がそれぞれ制御されるとともにマスフローコントローラ82、86に対応して水素ガス電磁弁83、プロパンガス電磁弁87が開閉され、燃料ガス(水素ガス、プロパンガス、又は水素ガスとプロパンガスが混合された混合ガスのいずれか)が燃料ガス電磁弁89を介して予熱孔23に供給される。このとき燃料ガス電磁弁89は、開かれている。
また、制御部61からの制御信号によって水素ガス供給回路81の水素ガス電磁弁83を開くとともに予熱酸素ガス供給回路51の予熱酸素電磁弁52及び予熱酸素High回路53の予熱酸素High電磁弁54を開き予熱孔23に水素ガス及び予熱用酸素ガスを供給する。
また、制御部61からの制御信号によって切断酸素供給回路55の切断酸素電磁弁56が開かれ切断酸素孔22に切断用酸素ガスを供給する。
その結果、予熱孔23で燃料ガスと予熱用酸素ガスが燃焼して予熱炎が形成されてワークが加熱されるとともに加熱された部分に切断酸素孔22から切断用酸素ガスが噴射されてピアシングが行なわれる。
制御部61からの制御信号によってマスフローコントローラ82の開度がゼロとされるとともに水素ガス電磁弁83が閉じられ、マスフローコントローラ86が設定された開度に制御されるとともにプロパンガス電磁弁87は開かれ、プロパンガスが燃料ガス電磁弁89を介して予熱孔23に供給される。このとき燃料ガス電磁弁89は開かれている。
また、制御部61からの制御信号によって水素ガス供給回路81の水素ガス電磁弁83を開いて予熱孔23に予熱用酸素ガスを供給する。切断時には予熱酸素High電磁弁54は閉じられる。
また、切断酸素供給回路55の切断酸素電磁弁56を開いて切断酸素孔22に切断用酸素ガスを供給する。
その結果、予熱孔23でプロパンガスと酸素ガスが燃焼して予熱炎が形成されてワークが加熱されるとともに加熱された部分に切断酸素孔22から切断用酸素ガスが噴射されてワークの切断が行なわれる。
また、水素ガスへの炭化水素系ガスの混合比を体積比で10%以下に調整した場合には水素ガスとほぼ同等の加熱力を確保しつつ水素ガスの削減をすることができる点でより好適である。
上記実施の形態においては、炭化水素系ガスとして、プロパンガスを用いる場合について説明したが、プロパンガスに代えて、LPG(液化石油ガス)、ブタンガス、又はプロパンガス、LPG(液化石油ガス)、ブタンガスのうち少なくともいずれかを混合したガスを燃料ガスとして用いてもよい。
また、プロパンガス、LPG、ブタンガス以外の炭化水素系ガス又は、それらの混合ガスを用いてもよい。
図5は、この発明のガス切断方法における「ガス混合比による燃焼熱量と最短ピアシング時間の関係」を、燃料ガスが、プロパンガス、30%プロパンガス+70%水素ガスの混合ガス(数値は体積比、以下、同じ)、20%プロパンガス+80%水素ガスの混合ガス、10%プロパンガス+90%水素ガスの混合ガス、5%プロパンガス+95%水素ガスの混合ガス、及び水素ガスの場合について示した図である。
なお、工業的には、横軸の燃焼熱量については小さいほうが、縦軸の最短ピアシング時間については短いほうが好適であるといえる。
以上のように、水素ガスに30%のプロパンガスを混合した場合、必要な熱エネルギーを確保しつつ水素ガスの消費を削減できることが確認された。
22 切断酸素孔
23 予熱孔
30、70 ガス切断装置
40、80 燃料ガス供給回路
41、81 水素ガス供給回路
42 水素ガス電磁弁
45、85 プロパンガス供給回路(炭化水素系ガス供給回路)
46 プロパンガス電磁弁
50 酸素ガス供給回路
51 予熱酸素ガス供給回路
52 予熱酸素電磁弁
53 予熱酸素High回路
54 予熱酸素High電磁弁
55 切断酸素供給回路
56 切断酸素電磁弁
60 制御部(ガス供給制御手段)
72 水素ガス用マスフローコントローラ
76 プロパンガス用マスフローコントローラ
Sh 水素供給源
Sp プロパンガス供給源
So 酸素ガス供給源
Claims (12)
- 燃料ガスと予熱用酸素ガスにより予熱炎を形成する予熱孔と、切断用酸素ガスを噴射してワークを切断する切断酸素孔とを備えた切断火口によるガス切断方法であって、
水素ガスと炭化水素系ガスの少なくともいずれかを含んで構成された前記燃料ガスを用いて、
前記ワークを加熱する場合と前記ワークを切断する場合とで、前記予熱孔に供給する前記水素ガスと前記炭化水素系ガスの比率を変更することを特徴とするガス切断方法。 - 請求項1に記載のガス切断方法であって、
前記ワークを加熱する場合は、前記水素ガス、又は前記水素ガスと前記炭化水素系ガスとを混合して前記予熱孔に供給することを特徴とするガス切断方法。 - 請求項2に記載のガス切断方法であって、
前記水素ガスへの前記炭化水素系ガスの混合比は、体積比で30%以下であることを特徴とするガス切断方法。 - 請求項2に記載のガス切断方法であって、
前記水素ガスへの前記炭化水素系ガスの混合比は、体積比で10%以下であることを特徴とするガス切断方法。 - 請求項2から請求項4のいずれか1項に記載のガス切断方法であって、
前記ワークを切断する場合は、前記予熱孔に前記炭化水素系ガスを供給することを特徴とするガス切断方法。 - 請求項2から請求項4のいずれか1項に記載のガス切断方法であって、
前記ワークを切断する場合は、前記予熱孔に前記水素ガスと前記炭化水素系ガスの混合ガスを供給することを特徴とするガス切断方法。 - 請求項2から請求項6のいずれか1項に記載のガス切断方法であって、
前記炭化水素系ガスはLPGであることを特徴とするガス切断方法。 - 請求項2から請求項6のいずれか1項に記載のガス切断方法であって、
前記炭化水素系ガスはプロパンガスであることを特徴とするガス切断方法。 - 請求項2から請求項6のいずれか1項に記載のガス切断方法であって、
前記炭化水素系ガスはブタンガスであることを特徴とするガス切断方法。 - 燃料ガスと予熱用酸素ガスにより予熱炎を形成する予熱孔と、切断用酸素ガスを噴射してワークを切断する切断酸素孔とを備えた切断火口に酸素ガスと前記燃料ガスと酸素ガスとを供給するガス切断装置であって、
酸素ガス供給回路と、水素ガス供給回路と、炭化水素系ガス供給回路と、ガス供給制御手段と、を備え、
前記予熱孔には、酸素ガス供給回路と、水素ガス供給回路と、炭化水素系ガス供給回路とが接続されるとともに、前記水素ガス供給回路からの水素ガスの流量と前記炭化水素系ガス供給回路からの炭化水素系ガスの流量とは変更可能とされ、
前記切断酸素孔には前記酸素ガス供給回路が接続され、
前記ガス供給制御手段は、
前記ワークを加熱する場合と前記ワークを切断する場合とで、前記予熱孔に供給する前記水素ガスと前記炭化水素系ガスの比率を変更するように構成されていることを特徴とするガス切断装置。 - 請求項10に記載のガス切断装置であって、
前記ガス供給制御手段は、
前記ワークを加熱する場合に、
前記水素ガス、又は前記水素ガスと前記炭化水素系ガスとを混合した混合ガスを、前記燃料ガスとして前記予熱孔に供給するように構成されていることを特徴とするガス切断装置。 - 請求項11に記載のガス切断装置であって、
前記ガス供給制御手段は、
前記水素ガスへの前記炭化水素系ガスの混合比を、体積比で30%以下に調整するように構成されていることを特徴とするガス切断装置。
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JP3881616B2 (ja) * | 2002-11-15 | 2007-02-14 | 小池酸素工業株式会社 | ガス切断火口 |
JP4875949B2 (ja) * | 2006-08-22 | 2012-02-15 | 大陽日酸株式会社 | ガス切断方法 |
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2009
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- 2009-08-19 CN CN2009801355836A patent/CN102149498A/zh active Pending
- 2009-08-19 WO PCT/JP2009/003946 patent/WO2010032376A1/ja active Application Filing
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JPS59219391A (ja) * | 1983-05-27 | 1984-12-10 | Nichigou Asechiren Kk | 溶断、溶接等の金属熱加工用の燃料ガス |
JP2003080368A (ja) * | 2001-09-12 | 2003-03-18 | Takuma Abe | 鋼板溶断用ガスの流出量制御装置 |
JP2005224845A (ja) * | 2004-02-16 | 2005-08-25 | Hitachi Zosen Corp | 金属溶断装置における溶断ガスの供給方法 |
JP2007000902A (ja) * | 2005-06-24 | 2007-01-11 | Air Water Inc | 圧延鋼材のガス切断方法 |
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Cited By (7)
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WO2011132496A1 (ja) * | 2010-04-20 | 2011-10-27 | 大陽日酸株式会社 | ガス切断方法及びガス切断装置、ならびに切断火口 |
CN102869471A (zh) * | 2010-04-20 | 2013-01-09 | 大阳日酸株式会社 | 气割方法和气割装置及切割喷嘴 |
JP5859957B2 (ja) * | 2010-04-20 | 2016-02-16 | 大陽日酸株式会社 | ガス切断方法 |
JP2014069232A (ja) * | 2012-10-01 | 2014-04-21 | Iwatani Industrial Gases Corp | 可燃性ガスおよび鋼材の溶断方法 |
JP2016136074A (ja) * | 2015-01-23 | 2016-07-28 | 三浦工業株式会社 | 燃焼装置における燃料ガスの燃焼方法及び燃焼システム |
JP2018034191A (ja) * | 2016-08-31 | 2018-03-08 | 大陽日酸株式会社 | ガス切断用燃料ガス、及びガス切断方法 |
JP7129752B2 (ja) | 2016-08-31 | 2022-09-02 | 大陽日酸株式会社 | ガス切断用燃料ガス、及びガス切断方法 |
Also Published As
Publication number | Publication date |
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JP5276937B2 (ja) | 2013-08-28 |
US20110146846A1 (en) | 2011-06-23 |
US8574379B2 (en) | 2013-11-05 |
JP2010069487A (ja) | 2010-04-02 |
CN102149498A (zh) | 2011-08-10 |
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