JP2007162055A - Method of generating atmospheric gas for carburizing - Google Patents

Method of generating atmospheric gas for carburizing Download PDF

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JP2007162055A
JP2007162055A JP2005358404A JP2005358404A JP2007162055A JP 2007162055 A JP2007162055 A JP 2007162055A JP 2005358404 A JP2005358404 A JP 2005358404A JP 2005358404 A JP2005358404 A JP 2005358404A JP 2007162055 A JP2007162055 A JP 2007162055A
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carburizing
gas
furnace
mixed gas
oxygen
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JP4823670B2 (en
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Hidetoshi Ota
英俊 太田
Naoyuki Takano
直幸 高野
Tomohiro Wada
智宏 和田
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Taiyo Nippon Sanso Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of generating atmospheric gas for carburizing, with which atmospheric gas for carburizing can be stably generated with high efficiency while suppressing production of soot. <P>SOLUTION: A gaseous starting mixture obtained by mixing at least one kind selected from carbon dioxide, oxygen and air into dimethylether is introduced into a conversion furnace comprising a nickel catalyst layer, and a gaseous mixture for carburizing comprising carbon monoxide and hydrogen is generated by catalytic reaction. Further, the gaseous mixture for carburizing can be generated by burning the gaseous starting mixture by a combustion furnace, and further, the gaseous mixture for carburizing can be generated by injecting the gaseous starting mixture into a carburizing furnace. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、浸炭用雰囲気ガス発生方法に関し、詳しくは、鋼材製の部品等の迅速浸炭処理を効果的に行うことができる組成の浸炭用雰囲気ガスを発生させるための方法に関する。   The present invention relates to a carburizing atmosphere gas generation method, and more particularly to a method for generating a carburizing atmosphere gas having a composition capable of effectively performing a rapid carburizing process on a steel part or the like.

一酸化炭素と水素とを含む浸炭用雰囲気ガスを発生させる方法として、炭化水素と二酸化炭素と酸素とを爆発混合気範囲外の混合組成で混合した原料混合ガスを熱変成させることによって前記浸炭用雰囲気ガスを発生させる方法が知られている（例えば、特許文献１参照。）。また、原料混合ガスを熱変成させる際の変成炉内での煤の発生を抑制するため、複数の変成炉と水分除去手段とを直列に配置することが提案されている（例えば、特許文献２参照。）。
特開２０００−２５６８２４号公報 特開２００３−３４２７０９号公報 As a method for generating a carburizing atmosphere gas containing carbon monoxide and hydrogen, the raw material mixed gas obtained by mixing hydrocarbon, carbon dioxide, and oxygen in a mixed composition outside the range of the explosive mixture is thermally transformed and used for carburizing. A method for generating atmospheric gas is known (for example, see Patent Document 1). Moreover, in order to suppress the generation | occurrence | production of the soot in the transformation furnace at the time of carrying out the thermal transformation of raw material mixed gas, arrange | positioning a some transformation furnace and a water | moisture-content removal means in series is proposed (for example, patent document 2). reference.).
JP 2000-256824 A JP 2003-342709 A

しかし、複数の変成炉及び水分除去手段を配置することにより、前記浸炭用雰囲気ガスを安定して発生させることができるが、設備の大型化や複雑化を招くという問題があった。   However, by arranging a plurality of shift furnaces and moisture removing means, the carburizing atmosphere gas can be stably generated, but there is a problem that the equipment is increased in size and complexity.

そこで本発明は、煤の発生を抑制しながら浸炭用雰囲気ガスを効率よく安定して発生させることができる浸炭用雰囲気ガス方法を提供することを目的としている。   Accordingly, an object of the present invention is to provide a carburizing atmosphere gas method that can efficiently and stably generate carburizing atmosphere gas while suppressing the generation of soot.

上記目的を達成するため、本発明の浸炭用雰囲気ガス発生方法における第１の構成は、ジメチルエーテルに、二酸化炭素、酸素及び空気の少なくとも１種を混合した原料混合ガスを、ニッケル触媒層を有する変成炉に導入し、触媒反応によって一酸化炭素と水素とを含む浸炭用混合ガスを発生させることを特徴としている。   In order to achieve the above object, a first configuration in the carburizing atmosphere gas generation method of the present invention is a modification in which a raw material mixed gas in which at least one of carbon dioxide, oxygen, and air is mixed with dimethyl ether is provided with a nickel catalyst layer. It is introduced into a furnace and generates a carburized mixed gas containing carbon monoxide and hydrogen by a catalytic reaction.

また、本発明の浸炭用雰囲気ガスの発生方法における第２の構成は、ジメチルエーテルに、二酸化炭素、酸素及び空気の少なくとも１種を混合した原料混合ガスを、燃焼炉で燃焼させることによって一酸化炭素と水素とを含む浸炭用混合ガスを発生させることを特徴としている。   The second configuration of the carburizing atmosphere gas generation method of the present invention is that carbon monoxide is obtained by burning a raw material mixed gas in which at least one of carbon dioxide, oxygen and air is mixed with dimethyl ether in a combustion furnace. It is characterized by generating a carburized mixed gas containing hydrogen and hydrogen.

さらに、本発明の浸炭用雰囲気ガスの発生方法における第３の構成は、ジメチルエーテルに、二酸化炭素、酸素及び空気の少なくとも１種を混合した原料混合ガスを、浸炭炉内に噴射することによって一酸化炭素と水素とを含む浸炭用混合ガスを発生させることを特徴としている。   Furthermore, the third configuration of the method for generating an atmospheric gas for carburizing according to the present invention is such that a raw material mixed gas obtained by mixing dimethyl ether with at least one of carbon dioxide, oxygen and air is injected into a carburizing furnace. It is characterized by generating a carburized mixed gas containing carbon and hydrogen.

本発明の浸炭用雰囲気ガス発生方法によれば、従来の炭化水素に代えてジメチルエーテルを使用したことにより、一酸化炭素と水素との組成比が１：１に近い迅速浸炭用雰囲気ガスを得ることができるとともに、ジメチルエーテルが炭素−炭素結合（Ｃ−Ｃ）を有していないため、煤が発生しにくく、変成炉での目詰まりの問題も解消でき、浸炭炉内での製品への煤の付着もなくなる。   According to the carburizing atmosphere gas generation method of the present invention, by using dimethyl ether instead of the conventional hydrocarbon, a quick carburizing atmosphere gas having a composition ratio of carbon monoxide and hydrogen close to 1: 1 is obtained. Since dimethyl ether does not have carbon-carbon bonds (C-C), soot is less likely to be generated, and the problem of clogging in the shift furnace can be eliminated. There is no adhesion.

図１は本発明の浸炭用雰囲気ガス発生方法を実施するための浸炭用雰囲気ガス発生装置の第１形態例を示す系統図である。この浸炭用雰囲気ガス発生装置は、原料となるジメチルエーテル、二酸化炭素及び酸素をそれぞれ供給するジメチルエーテル供給源１１、二酸化炭素供給源１２及び酸素供給源１３と、これらの供給量を調整するための流量調整器１４，１５，１６と，これらを混合して原料混合ガスを得るためのガス混合器１７と、ニッケル触媒層を有する変成炉１８と、変成炉１８での触媒反応によって生成した一酸化炭素と水素とを含む変成ガス（浸炭用混合ガス）を冷却するガス冷却器１９と、浸炭用混合ガスの組成分析を行うガス分析計２０とを備えており、生成した浸炭用混合ガスは、浸炭炉２１に供給されて浸炭用雰囲気ガスとして使用される。   FIG. 1 is a system diagram showing a first embodiment of a carburizing atmosphere gas generator for carrying out the carburizing atmosphere gas generation method of the present invention. This carburizing atmosphere gas generator includes a dimethyl ether supply source 11, a carbon dioxide supply source 12 and an oxygen supply source 13 for supplying dimethyl ether, carbon dioxide and oxygen as raw materials, and a flow rate adjustment for adjusting these supply amounts. 14, 15, 16, a gas mixer 17 for mixing these to obtain a raw material mixed gas, a shift furnace 18 having a nickel catalyst layer, and carbon monoxide generated by a catalytic reaction in the shift furnace 18 A gas cooler 19 that cools a metamorphic gas containing hydrogen (a carburized mixed gas) and a gas analyzer 20 that performs composition analysis of the carburized mixed gas are provided. 21 is used as a carburizing atmosphere gas.

前記変成炉１８には、反応温度を調節するための温度センサ２２及びヒータ２３が設けられており、原料混合ガスの組成に応じて最適な温度で触媒反応が進行するように、通常は１０００〜１１００℃の範囲、例えば１０５０℃程度に制御するようにしている。また、酸素供給源１３から供給するガスは、酸素を含有する様々なガスを使用することができ、空気を使用することもできる。さらに、二酸化炭素供給源１２及び酸素供給源１３は、いずれか一方のみを設けるようにしてもよい。   The shift furnace 18 is provided with a temperature sensor 22 and a heater 23 for adjusting the reaction temperature, and is usually 1000-1000 so that the catalytic reaction proceeds at an optimum temperature according to the composition of the raw material mixed gas. The temperature is controlled in the range of 1100 ° C., for example, about 1050 ° C. Moreover, the gas supplied from the oxygen supply source 13 can use various gas containing oxygen, and can also use air. Further, only one of the carbon dioxide supply source 12 and the oxygen supply source 13 may be provided.

このように形成した浸炭用雰囲気ガス発生装置において、ジメチルエーテル供給源１１から供給されるジメチルエーテルと、酸素供給源１３から供給される酸素ガスとを、モル比２：１で混合して変成炉１８に導入し、ニッケル触媒によって変成反応させると、次式、
（ＣＨ３）２Ｏ＋０．５Ｏ２→２ＣＯ＋３Ｈ２
から、２モルの一酸化炭素と３モルの水素とが生成するので、一酸化炭素濃度４０％、水素濃度６０％の変成ガスが得られる。 In the carburizing atmosphere gas generator thus formed, dimethyl ether supplied from the dimethyl ether supply source 11 and oxygen gas supplied from the oxygen supply source 13 are mixed at a molar ratio of 2: 1 to the shift furnace 18. When introduced and transformed with a nickel catalyst,
(CH 3 ) 2 O + 0.5O 2 → 2CO + 3H 2
From this, 2 mol of carbon monoxide and 3 mol of hydrogen are produced, so that a modified gas having a carbon monoxide concentration of 40% and a hydrogen concentration of 60% is obtained.

また、ジメチルエーテル供給源１１から供給されるジメチルエーテルと、二酸化炭素供給源１２から供給される二酸化炭素とを、モル比１：１で混合して変成炉１８に導入し、ニッケル触媒によって変成反応させると、次式、
（ＣＨ３）２Ｏ＋ＣＯ２→３ＣＯ＋３Ｈ２
から、３モルの一酸化炭素と３モルの水素とが生成するので、一酸化炭素濃度５０％、水素濃度５０％の変成ガスが得られる。 Further, when dimethyl ether supplied from the dimethyl ether supply source 11 and carbon dioxide supplied from the carbon dioxide supply source 12 are mixed at a molar ratio of 1: 1 and introduced into the shift furnace 18 to undergo a shift reaction using a nickel catalyst. ,
(CH 3 ) 2 O + CO 2 → 3CO + 3H 2
From this, 3 mol of carbon monoxide and 3 mol of hydrogen are produced, so that a modified gas having a carbon monoxide concentration of 50% and a hydrogen concentration of 50% is obtained.

酸素供給源１３から空気を供給し、体積比でジメチルエーテルの２．３８倍の空気と混合させて変成反応させると、２モルの一酸化炭素と３モルの水素と１．８８モルの窒素とが生成するので、一酸化炭素濃度２９％、水素濃度４４％、窒素濃度２７％の変成ガスが得られる。   When air is supplied from the oxygen supply source 13 and mixed with air that is 2.38 times as much as dimethyl ether in a volume ratio, it undergoes a metamorphic reaction, whereby 2 mol of carbon monoxide, 3 mol of hydrogen, and 1.88 mol of nitrogen are obtained. As a result, a modified gas having a carbon monoxide concentration of 29%, a hydrogen concentration of 44%, and a nitrogen concentration of 27% is obtained.

なお、ジメチルエーテルに混合するガスは、酸素のみ、空気のみを使用した場合、爆発濃度範囲がそれぞれ３．９〜６１％、３．４〜２７％であるため、爆発することがない二酸化炭素を用いることが安全上望ましい。また、ジメチルエーテルに混合するガスは、二酸化炭素のみ、酸素のみ、空気のみのいずれかであってもよいが、これらの２種以上をジメチルエーテルに混合してもよく、また、変成炉１８の温度が高いときには吸熱反応の二酸化炭素を供給し、温度が低いときには発熱反応の酸素を供給するようにしてもよい。   The gas mixed with dimethyl ether uses carbon dioxide that does not explode because the explosion concentration ranges are 3.9 to 61% and 3.4 to 27%, respectively, when only oxygen and air are used. It is desirable for safety. The gas mixed with dimethyl ether may be carbon dioxide only, oxygen only, or air only, but two or more of these may be mixed with dimethyl ether, and the temperature of the transformation furnace 18 may be Carbon dioxide for endothermic reaction may be supplied when the temperature is high, and oxygen for exothermic reaction may be supplied when the temperature is low.

図２は、浸炭用雰囲気ガス発生装置の第２形態例を示す系統図である。なお、以下の説明において、前記第１形態例で示した浸炭用雰囲気ガス発生装置における構成要素と同一の構成要素には、それぞれ同一符号を付して詳細な説明は省略する。   FIG. 2 is a system diagram showing a second embodiment of the carburizing atmosphere gas generator. In the following description, the same components as those in the carburizing atmosphere gas generator shown in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

この浸炭用雰囲気ガス発生装置は、ガス混合器１７で混合した原料混合ガスを燃焼炉３１の燃焼器３２に導入して燃焼させることにより、変成反応を進行させて前記同様の組成を有する浸炭用混合ガスを発生させるようにしている。   This carburizing atmosphere gas generator introduces the raw material mixed gas mixed in the gas mixer 17 into the combustor 32 of the combustion furnace 31 and burns it, thereby proceeding with the metamorphic reaction and having the same composition as described above. A mixed gas is generated.

図３は、浸炭用雰囲気ガスを浸炭炉内で発生させる方法の一形態例を示す系統図である。この方法では、ジメチルエーテル供給源１１、二酸化炭素供給源１２及び酸素供給源１３からそれぞれ供給され、流量調整器１４，１５，１６で流量調節されてガス混合器１７で混合した原料混合ガスを、７５０℃以上に保持された浸炭炉２１内に直接噴射し、浸炭炉２１内で原料混合ガスの変成反応を進行させることにより、前記同様の組成を有する浸炭用混合ガスを発生させるようにしている。   FIG. 3 is a system diagram showing an example of a method for generating the carburizing atmosphere gas in the carburizing furnace. In this method, a raw material mixed gas supplied from a dimethyl ether supply source 11, a carbon dioxide supply source 12 and an oxygen supply source 13, adjusted in flow rate by flow rate adjusters 14, 15, and 16 and mixed in a gas mixer 17 is 750. A carburized mixed gas having the same composition as described above is generated by directly injecting into the carburizing furnace 21 maintained at a temperature not lower than 0 ° C., and proceeding with the transformation reaction of the raw material mixed gas in the carburizing furnace 21.

上記各形態例に示すように、ジメチルエーテルに、二酸化炭素、酸素及び空気の少なくとも１種を混合した原料混合ガスを、ニッケル触媒層を有する変成炉１８に導入して触媒反応させたり、燃焼炉３１で燃焼させたり、７５０℃以上に保持された浸炭炉２１内に直接噴射したりすることにより、煤の発生を抑制しながら一酸化炭素と水素とのモル比が１：１に近い組成の浸炭用混合ガスを発生させることができる。この浸炭用混合ガスを浸炭炉内での浸炭用雰囲気ガスとして使用することにより、浸炭反応速度の向上が図れ、鋼材製の部品等の迅速浸炭処理を効果的に行うことができる。   As shown in the above embodiments, a raw material mixed gas obtained by mixing dimethyl ether with at least one of carbon dioxide, oxygen and air is introduced into a shift furnace 18 having a nickel catalyst layer to cause a catalytic reaction, or a combustion furnace 31. Or by directly injecting into a carburizing furnace 21 maintained at 750 ° C. or higher, so that the molar ratio of carbon monoxide to hydrogen is close to 1: 1 while suppressing the generation of soot. A mixed gas can be generated. By using this mixed gas for carburizing as an atmospheric gas for carburizing in the carburizing furnace, the carburization reaction rate can be improved, and quick carburizing treatment of steel parts and the like can be performed effectively.

さらに、浸炭用雰囲気ガス中の一酸化炭素濃度を高めることができるので、迅速かつ安定した浸炭処理を行うことができ、例えば、孔を有する部品を浸炭処理する場合には孔の奥にまで十分に均一に浸炭することができたり、細かい部品を積み重ねてベルト搬送しながら浸炭する場合にはベルト上の部品の積み重ね厚さを増すことができたりするという効果が得られる。また、本発明方法は、簡単な装置構成で容易に実施でき、既存装置の転用も可能であるというメリットも有している。   Furthermore, since the carbon monoxide concentration in the atmosphere gas for carburizing can be increased, a quick and stable carburizing process can be performed. For example, when carburizing a part having a hole, it is sufficiently deep into the hole. Can be carburized uniformly, or when stacking fine parts and carburizing while conveying the belt, the stacking thickness of the parts on the belt can be increased. In addition, the method of the present invention has an advantage that it can be easily implemented with a simple apparatus configuration, and the existing apparatus can be diverted.

本発明の浸炭用雰囲気ガス発生方法を実施するための浸炭用雰囲気ガス発生装置の第１形態例を示す系統図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a system diagram showing a first embodiment of a carburizing atmosphere gas generator for carrying out the carburizing atmosphere gas generation method of the present invention. 浸炭用雰囲気ガス発生装置の第２形態例を示す系統図である。It is a systematic diagram which shows the 2nd example of an atmosphere gas generator for carburizing. 浸炭用雰囲気ガスを浸炭炉内で発生させる方法の一形態例を示す系統図である。It is a systematic diagram which shows one example of the method of generating the atmospheric gas for carburizing within a carburizing furnace.

符号の説明Explanation of symbols

１１…ジメチルエーテル供給源、１２…二酸化炭素供給源、１３…酸素供給源、１４，１５，１６…流量調整器、１７…ガス混合器、１８…変成炉、１９…ガス冷却器、２０…ガス分析計、２１…浸炭炉、２２…温度センサ、２３…ヒータ、３１…燃焼炉、３２…燃焼器   DESCRIPTION OF SYMBOLS 11 ... Dimethyl ether supply source, 12 ... Carbon dioxide supply source, 13 ... Oxygen supply source, 14, 15, 16 ... Flow regulator, 17 ... Gas mixer, 18 ... Shifting furnace, 19 ... Gas cooler, 20 ... Gas analysis 21 ... carburizing furnace, 22 ... temperature sensor, 23 ... heater, 31 ... combustion furnace, 32 ... combustor

Claims (3)

ジメチルエーテルに、二酸化炭素、酸素及び空気の少なくとも１種を混合した原料混合ガスを、ニッケル触媒層を有する変成炉に導入し、触媒反応によって一酸化炭素と水素とを含む浸炭用混合ガスを発生させることを特徴とする迅速浸炭用雰囲気ガスの発生方法。   A raw material mixed gas in which at least one of carbon dioxide, oxygen and air is mixed with dimethyl ether is introduced into a shift furnace having a nickel catalyst layer, and a carburized mixed gas containing carbon monoxide and hydrogen is generated by a catalytic reaction. A method for generating an atmospheric gas for rapid carburizing, characterized in that ジメチルエーテルに、二酸化炭素、酸素及び空気の少なくとも１種を混合した原料混合ガスを、燃焼炉で燃焼させることによって一酸化炭素と水素とを含む浸炭用混合ガスを発生させることを特徴とする迅速浸炭用雰囲気ガスの発生方法。   Rapid carburization characterized by generating a carburized mixed gas containing carbon monoxide and hydrogen by burning a raw material mixed gas obtained by mixing dimethyl ether with at least one of carbon dioxide, oxygen and air in a combustion furnace For generating atmospheric gas for use. ジメチルエーテルに、二酸化炭素、酸素及び空気の少なくとも１種を混合した原料混合ガスを、浸炭炉内に噴射することによって一酸化炭素と水素とを含む浸炭用混合ガスを発生させることを特徴とする迅速浸炭用雰囲気ガスの発生方法。   Rapidly generating a carburized mixed gas containing carbon monoxide and hydrogen by injecting a raw material mixed gas obtained by mixing dimethyl ether with at least one of carbon dioxide, oxygen and air into a carburizing furnace How to generate carburizing atmosphere gas.
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Cited By (3)

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JP2009235451A (en) * 2008-03-26 2009-10-15 Taiyo Nippon Sanso Corp Heat-treatment method
JP2014237868A (en) * 2013-06-06 2014-12-18 エア・ウォーター株式会社 Carburization method and carburizing treatment gas used for the method
JP2015182907A (en) * 2014-03-20 2015-10-22 Ｊｆｅスチール株式会社 Method for producing carbon monoxide and hydrogen

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JPS61153271A (en) * 1984-11-13 1986-07-11 エア−．プロダクツ．アンド．ケミカルス．インコ−ポレ−テツド Promoted carburization by indivisual atomosphere
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JP2014237868A (en) * 2013-06-06 2014-12-18 エア・ウォーター株式会社 Carburization method and carburizing treatment gas used for the method
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