JP5760373B2 - Mixed gas production apparatus and mixed gas production method - Google Patents

Mixed gas production apparatus and mixed gas production method Download PDF

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JP5760373B2
JP5760373B2 JP2010235661A JP2010235661A JP5760373B2 JP 5760373 B2 JP5760373 B2 JP 5760373B2 JP 2010235661 A JP2010235661 A JP 2010235661A JP 2010235661 A JP2010235661 A JP 2010235661A JP 5760373 B2 JP5760373 B2 JP 5760373B2
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中道　悟
悟 中道
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本発明は、ガス製造設備等において用いられ、二種類のガスを混合して混合ガスを製造する、混合ガス製造装置及び混合ガス製造方法に関するものである。   The present invention relates to a mixed gas manufacturing apparatus and a mixed gas manufacturing method, which are used in a gas manufacturing facility or the like, and manufacture a mixed gas by mixing two kinds of gases.

従来から、特に、製鉄業においては、高炉、コークス炉、転炉等における燃焼等によって、複数種類のガスが副産される。これらの副産された複数種類のガスは、混合して製造した混合ガスとすることにより、例えば、加熱炉等で用いる燃料ガスとして再利用することが可能となる。
複数種類のガスを混合して、混合ガスを製造する技術としては、例えば、特許文献１に記載されているように、複数種類のうち二種類のガスに対し、減圧弁によりそれぞれの圧力を減圧可能とした構成のガス混合装置が提案されている。 Conventionally, in the steel industry, in particular, a plurality of types of gases are by-produced by combustion in a blast furnace, coke oven, converter, or the like. A plurality of types of these by-produced gases can be reused as a fuel gas used in, for example, a heating furnace, etc., by using a mixed gas produced by mixing.
As a technique for producing a mixed gas by mixing a plurality of types of gases, for example, as described in Patent Document 1, the pressure of each of the two types of gases is reduced by a pressure reducing valve. There has been proposed a gas mixing apparatus having a configuration that enables it.

ところで、上記のように副産された複数種類のガスは、副産する設備（高炉等）や回収する方法の違いにより、発熱量や燃焼速度等の燃焼特性が異なっている。このため、二種類のガスを混合して製造した混合ガスが、一定の燃焼特性を得るためには、二種類のガスを、予め設定した一定の混合比率で混合する必要がある。
また、上述した二種類のガスは、それぞれの圧力（ガス圧）が、ガスを貯蔵するガスホルダーの種類により差があることや、ガスホルダーに貯蔵したガスの容積によって、例えば、ガスホルダー内で貯蔵したガスの上方に配置された中蓋の位置が上下することにより、圧力が段階的に変化する場合がある。さらに、製鉄所等の配管ネットワークでは、ガスに生じる潮流変化により、配管ネットワークにおいて、ガスに圧力の変化が発生する場合がある。 By the way, a plurality of types of gases produced as a by-product as described above have different combustion characteristics such as a calorific value and a combustion rate due to differences in by-product facilities (such as a blast furnace) and recovery methods. For this reason, in order for a mixed gas produced by mixing two types of gas to obtain a certain combustion characteristic, it is necessary to mix the two types of gas at a predetermined constant mixing ratio.
In addition, the above-mentioned two types of gases have different pressures (gas pressures) depending on the type of gas holder that stores the gas, and depending on the volume of gas stored in the gas holder, for example, in the gas holder. The pressure may change stepwise as the position of the inner lid arranged above the stored gas moves up and down. Furthermore, in a piping network such as a steelworks, a change in pressure may occur in the gas in the piping network due to a change in tidal current generated in the gas.

したがって、二種類のガスに圧力の変化が発生する場合、混合ガスを製造する際に行う、二種類のガスに対する混合制御においては、一般的に、他のガスよりも混合比率が多い主成分ガスの圧力を、圧力を調整可能な圧力調整弁で減圧し、主成分ガスよりも圧力が高い添加ガスの流量を、流量調整弁で制御する必要がある。
ここで、圧力調整弁及び流量調整弁を備えたガス混合装置としては、例えば、図４中に示すような装置がある。なお、図４は、従来例のガス混合装置の概略構成を示す図である。 Therefore, when pressure changes occur in two types of gas, in the mixing control for the two types of gas, which is performed when the mixed gas is manufactured, the main component gas generally having a higher mixing ratio than other gases Therefore, it is necessary to control the flow rate of the additive gas having a pressure higher than that of the main component gas with the flow rate adjusting valve.
Here, as a gas mixing apparatus provided with a pressure regulating valve and a flow regulating valve, for example, there is an apparatus as shown in FIG. In addition, FIG. 4 is a figure which shows schematic structure of the gas mixing apparatus of a prior art example.

以下、図４を参照して、従来例のガス混合装置の構成を説明する。
図４中に示すように、従来例の混合ガス製造装置１は、圧力調整弁２と、流量調整弁４と、添加ガス用流量計６と、主成分ガス用流量計８と、流量調節計１０と、開度調節計３４と、混合ガス用圧力計１２と、ガスブロワー１４を備えている。なお、混合ガス製造装置１の構成は、ガスブロワー１４を備えていない構成としてもよい。 Hereinafter, the configuration of a conventional gas mixing apparatus will be described with reference to FIG.
As shown in FIG. 4, the conventional mixed gas production apparatus 1 includes a pressure regulating valve 2, a flow regulating valve 4, an additive gas flow meter 6, a main component gas flow meter 8, and a flow regulator. 10, an opening degree controller 34, a mixed gas pressure gauge 12, and a gas blower 14. In addition, the structure of the mixed gas manufacturing apparatus 1 is good also as a structure which is not provided with the gas blower 14. FIG.

圧力調整弁２は、主成分ガスの供給経路である主成分ガス用配管２４に設けられており、添加ガスと主成分ガスを混合する際の、主成分ガスの圧力を調整可能な弁である。流量調整弁４は、添加ガスの供給経路である添加ガス用配管２８に設けられており、添加ガスと主成分ガスを混合する際の、添加ガスの流量を調整可能な弁である。
ここで、添加ガスは、製鉄所等の配管ネットワーク３０を介して、添加ガス用配管２８へ供給される。また、主成分ガスは、主成分ガスホルダー２６に貯蔵されており、主成分ガスホルダー２６から主成分ガス用配管２４へ供給される。 The pressure adjusting valve 2 is provided in a main component gas pipe 24 which is a supply path for main component gas, and is a valve capable of adjusting the pressure of the main component gas when the additive gas and the main component gas are mixed. . The flow rate adjusting valve 4 is provided in the additive gas pipe 28 serving as an additive gas supply path, and is a valve capable of adjusting the additive gas flow rate when the additive gas and the main component gas are mixed.
Here, the additive gas is supplied to the additive gas pipe 28 via a pipe network 30 such as a steel mill. The main component gas is stored in the main component gas holder 26 and supplied from the main component gas holder 26 to the main component gas pipe 24.

添加ガス用流量計６は、添加ガス用配管２８において、流量調整弁４よりも上流側に設けられており、添加ガス用配管２８における添加ガスの流量を検出する。一方、主成分ガス用流量計８は、主成分ガス用配管２４において、圧力調整弁２よりも上流側に設けられており、主成分ガス用配管２４における主成分ガスの流量を検出する。
流量調節計１０は、添加ガス用流量計６が検出した添加ガスの流量と、主成分ガス用流量計８が検出した主成分ガスの流量に応じて、主成分ガスに対する添加ガスの混合比率が所望の比率となるように、流量調整弁４を制御する。開度調節計３４は、主成分ガスの圧力が、常に、添加ガスの圧力未満となるように、圧力調整弁２を制御する。 The additive gas flow meter 6 is provided upstream of the flow rate adjusting valve 4 in the additive gas pipe 28, and detects the flow rate of the additive gas in the additive gas pipe 28. On the other hand, the main component gas flow meter 8 is provided upstream of the pressure regulating valve 2 in the main component gas pipe 24, and detects the flow rate of the main component gas in the main component gas pipe 24.
According to the flow rate of the additive gas detected by the additive gas flow meter 6 and the flow rate of the principal component gas detected by the principal component gas flow meter 8, the flow rate controller 10 has a mixing ratio of the additive gas to the principal component gas. The flow rate adjustment valve 4 is controlled so as to obtain a desired ratio. The opening degree controller 34 controls the pressure regulating valve 2 so that the pressure of the main component gas is always less than the pressure of the additive gas.

混合ガス用圧力計１２は、添加ガス用配管２８と主成分ガス用配管２４が合流した位置よりも下流側の配管である混合ガス用配管３２に設けられており、添加ガスと主成分ガスを混合した混合ガスの圧力を検出する。ガスブロワー１４は、添加ガスと主成分ガスを混合して製造した混合ガスを昇圧して、混合ガスを消費する加熱炉等のガス消費設備へ送出する。
なお、混合ガス製造装置１の構成が、ガスブロワー１４を備えていない構成である場合は、製造された混合ガスは、混合ガスを直接消費する加熱炉等において消費される。 The mixed gas pressure gauge 12 is provided in a mixed gas pipe 32 which is a pipe downstream from the position where the additive gas pipe 28 and the main component gas pipe 24 merge. The pressure of the mixed gas mixed is detected. The gas blower 14 pressurizes the mixed gas produced by mixing the additive gas and the main component gas, and sends the mixed gas to a gas consuming facility such as a heating furnace that consumes the mixed gas.
In addition, when the structure of the mixed gas manufacturing apparatus 1 is a structure which is not provided with the gas blower 14, the manufactured mixed gas is consumed in the heating furnace etc. which consume a mixed gas directly.

このような構成の混合ガス製造装置１では、添加ガスの圧力が、主成分ガスの圧力に対して一定値以上高い場合は、圧力調整弁２を制御することにより、添加ガスの圧力を、主成分ガスの圧力よりも大きくしている。
しかしながら、配管ネットワーク３０内で潮流変化が生じて添加ガスの圧力が変動するとともに、主成分ガスホルダー２６の貯蔵量が変化することにより、主成分ガスの圧力が段階的に変化すると、例えば、図５中に示すように、添加ガスの圧力Ｐｓｕｂと主成分ガスの圧力Ｐｍａｉｎが同一となる場合や、主成分ガスの圧力Ｐｍａｉｎが添加ガスの圧力Ｐｓｕｂよりも大きくなる場合がある。 In the mixed gas manufacturing apparatus 1 having such a configuration, when the pressure of the additive gas is higher than the pressure of the main component gas by a certain value or more, the pressure of the additive gas is controlled by controlling the pressure regulating valve 2. It is larger than the pressure of the component gas.
However, if the pressure of the main component gas changes stepwise due to a change in tidal current in the piping network 30 and a change in the pressure of the additive gas and a change in the storage amount of the main component gas holder 26, for example, FIG. 5, the pressure Psub of the additive gas and the pressure Pmain of the main component gas may be the same, or the pressure Pmain of the main component gas may be greater than the pressure Psub of the additive gas.

なお、図５は、従来例のガス混合装置において主成分ガスの圧力を調整していない場合の、添加ガスと主成分ガスの圧力バランスを模式的に表したグラフである。また、図５中では、縦軸にガス(添加ガス、主成分ガス）の圧力（図中では、「ガス圧力」と記載する）を示し、横軸に経過時間（図中では、「時間」と記載する）を示している。また、図５中では、添加ガスの圧力Ｐｓｕｂと主成分ガスの圧力Ｐｍａｉｎが同一、及び主成分ガスの圧力Ｐｍａｉｎが添加ガスの圧力Ｐｓｕｂよりも大きい時間帯を、符号「Ｔｚ２」で示している。   FIG. 5 is a graph schematically showing the pressure balance between the additive gas and the main component gas when the pressure of the main component gas is not adjusted in the conventional gas mixing apparatus. In FIG. 5, the vertical axis represents the pressure of the gas (added gas, main component gas) (denoted as “gas pressure” in the figure), and the horizontal axis represents elapsed time (in the figure, “time”). ). Further, in FIG. 5, a time zone in which the pressure Psub of the additive gas and the pressure Pmain of the main component gas are the same and the pressure Pmain of the main component gas is larger than the pressure Psub of the additive gas is indicated by a symbol “Tz2”. .

添加ガスの圧力Ｐｓｕｂと主成分ガスの圧力Ｐｍａｉｎが同一、または、主成分ガスの圧力Ｐｍａｉｎが添加ガスの圧力Ｐｓｕｂよりも大きくなった場合、流量調整弁４の開度を最大値（全開）としても、添加ガスの流量を制御することが不可能となるため、添加ガスと主成分ガスとの混合制御が不可能となる。
したがって、添加ガスの圧力Ｐｓｕｂと主成分ガスの圧力Ｐｍａｉｎが同一、または、主成分ガスの圧力Ｐｍａｉｎが添加ガスの圧力Ｐｓｕｂよりも大きくなった場合、従来例の混合ガス製造装置１では、圧力調整弁２を制御することにより、主成分ガスの圧力を常時減圧する。これに加え、流量調整弁４を制御することにより、主成分ガスに対する添加ガスの混合比率を、所望の比率に制御する。 When the pressure Psub of the additive gas is the same as the pressure Pmain of the main component gas, or when the pressure Pmain of the main component gas is greater than the pressure Psub of the additive gas, the opening degree of the flow regulating valve 4 is set to the maximum value (fully opened). However, since it becomes impossible to control the flow rate of the additive gas, mixing control of the additive gas and the main component gas becomes impossible.
Therefore, when the pressure Psub of the additive gas and the pressure Pmain of the main component gas are the same, or the pressure Pmain of the main component gas is greater than the pressure Psub of the additive gas, the conventional mixed gas manufacturing apparatus 1 adjusts the pressure. By controlling the valve 2, the pressure of the main component gas is constantly reduced. In addition, the mixing ratio of the additive gas to the main component gas is controlled to a desired ratio by controlling the flow rate adjusting valve 4.

ここで、圧力調整弁２を制御する際には、開度調節計３４により、圧力調整弁２の開度を一定の開度に固定して行う場合が多い。このため、例えば、図６中に示すように、添加ガスの圧力と主成分ガスの圧力との間に、十分な圧力差がある状態（図中における時間帯Ｔｚ２以外の時間帯）であっても、主成分ガスの圧力Ｐｍａｉｎを、添加ガスの圧力Ｐｓｕｂよりも低くすることとなる。すなわち、従来例の混合ガス製造装置１では、添加ガスの圧力と主成分ガスの圧力との圧力差に関わらず、主成分ガスの圧力Ｐｍａｉｎを、常に、添加ガスの圧力Ｐｓｕｂよりも低くすることとなる。   Here, when the pressure regulating valve 2 is controlled, the opening of the pressure regulating valve 2 is often fixed at a certain opening by the opening controller 34. For this reason, for example, as shown in FIG. 6, there is a sufficient pressure difference between the pressure of the additive gas and the pressure of the main component gas (a time zone other than the time zone Tz2 in the figure). However, the pressure Pmain of the main component gas is made lower than the pressure Psub of the additive gas. That is, in the conventional mixed gas production apparatus 1, the main component gas pressure Pmain is always lower than the additive gas pressure Psub regardless of the pressure difference between the additive gas pressure and the main component gas pressure. It becomes.

なお、図６は、従来例のガス混合装置において主成分ガスの圧力を調整した場合の、添加ガスと主成分ガスの圧力バランスを模式的に表したグラフである。また、図６中では、図５と同様、縦軸にガス(添加ガス、主成分ガス）の圧力（図中では、「ガス圧力」と記載する）を示し、横軸に経過時間（図中では、「時間」と記載する）を示している。
また、図６中に示すように、圧力調整弁２の制御による主成分ガスの減圧量は、主成分ガスの圧力Ｐｍａｉｎが、主成分ガスホルダー等の運転条件によって、最も高い圧力である場合であっても、添加ガスの圧力Ｐｓｕｂの最低値よりも低くなる値とする必要がある。このため、圧力調整弁２を制御して主成分ガスを減圧する際には、主成分ガスの減圧幅が極めて大きくなる場合がある。 FIG. 6 is a graph schematically showing the pressure balance between the additive gas and the main component gas when the pressure of the main component gas is adjusted in the conventional gas mixing apparatus. In FIG. 6, as in FIG. 5, the vertical axis indicates the pressure of the gas (added gas, main component gas) (denoted as “gas pressure” in the figure), and the horizontal axis indicates the elapsed time (in the figure). Indicates “time”).
Further, as shown in FIG. 6, the amount of pressure reduction of the main component gas by the control of the pressure regulating valve 2 is the case where the pressure Pmain of the main component gas is the highest pressure depending on the operating conditions of the main component gas holder or the like. Even if it exists, it is necessary to set it as the value which becomes lower than the minimum value of the pressure Psub of an addition gas. For this reason, when the pressure regulating valve 2 is controlled to depressurize the main component gas, the depressurization range of the main component gas may become extremely large.

特開平３‐１０６４２９号公報Japanese Patent Laid-Open No. 3-106429

しかしながら、上述したような、添加ガスの圧力と主成分ガスの圧力が同一、または、主成分ガスの圧力が添加ガスの圧力よりも大きくなった場合であっても、潮流変化やガスホルダーの貯蔵量の変化による、添加ガスの圧力と主成分ガスの圧力との圧力差によっては、圧力調整弁の制御による主成分ガスの圧力の減圧が、必須ではない場合がある。
圧力調整弁の制御による主成分ガスの圧力の減圧が必須ではない場合、主成分ガスの圧力を、必要な時間帯よりも長い時間に亘って減圧することとなるため、主成分ガスに圧力エネルギーの損失が生じることとなる。 However, even when the pressure of the additive gas and the pressure of the main component gas are the same as described above, or even when the pressure of the main component gas is larger than the pressure of the additive gas, the tidal current change or the storage of the gas holder Depending on the pressure difference between the pressure of the additive gas and the pressure of the main component gas due to the change in the amount, the pressure reduction of the main component gas by the control of the pressure adjustment valve may not be essential.
If it is not essential to reduce the pressure of the main component gas by controlling the pressure regulating valve, the pressure of the main component gas will be reduced over a longer period of time than the required time zone. Loss will occur.

このため、製造した混合ガスを昇圧して送出するガスブロワーの所要電力が増加するという問題や、ガスブロワーが送出可能な混合ガスの量が減少するという問題が発生するため、混合ガスの製造に要するランニングコストが増加するという問題が発生するおそれがある。
本発明は、上述のような問題点に着目してなされたもので、混合ガスの製造に要するランニングコストを減少させることが可能な、混合ガス製造装置及び混合ガス製造方法を提供することを課題とする。 For this reason, there is a problem that the required power of the gas blower that boosts and sends out the produced mixed gas and a problem that the amount of the mixed gas that can be delivered by the gas blower decreases. There is a risk that the running cost required increases.
The present invention has been made paying attention to the above-described problems, and it is an object of the present invention to provide a mixed gas manufacturing apparatus and a mixed gas manufacturing method capable of reducing the running cost required for manufacturing a mixed gas. And

上記課題を解決するために、本発明のうち、請求項１に記載した発明は、添加ガスと主成分ガスとを、予め設定した混合比率で混合して混合ガスを製造する混合ガス製造装置であって、
前記主成分ガスと混合する前の前記添加ガスの圧力を検出する添加ガス用圧力検出手段と、
前記添加ガスと混合する前の前記主成分ガスの圧力を検出する主成分ガス用圧力検出手段と、
前記添加ガスと混合する前の前記主成分ガスの圧力を調整する圧力調整弁と、
前記添加ガス用圧力検出手段が検出した添加ガスの圧力及び前記主成分ガス用圧力検出手段が検出した主成分ガスの圧力に応じて、前記主成分ガスの圧力が前記添加ガスの圧力未満であり、且つ前記添加ガスの圧力から前記主成分ガスの圧力を減じた圧力差が少なくとも予め設定した前記混合比率に応じた圧力差未満であるときに、前記添加ガスの圧力と前記主成分ガスの圧力との差が前記混合比率に応じた圧力差以上となるように、前記圧力調整弁を制御する圧力制御手段と、を備えることを特徴とするものである。 In order to solve the above-mentioned problems, the invention described in claim 1 is a mixed gas production apparatus for producing a mixed gas by mixing an additive gas and a main component gas at a preset mixing ratio. There,
Pressure detection means for additive gas for detecting the pressure of the additive gas before mixing with the main component gas;
Pressure detecting means for main component gas for detecting the pressure of the main component gas before mixing with the additive gas;
A pressure adjusting valve for adjusting the pressure of the main component gas before mixing with the additive gas;
Depending on the pressure of the additive gas detected by the additive gas pressure detection means and the pressure of the principal component gas detected by the principal component gas pressure detection means, the pressure of the principal component gas is less than the pressure of the additive gas . When the pressure difference obtained by subtracting the pressure of the main component gas from the pressure of the additive gas is less than the pressure difference corresponding to at least the preset mixing ratio, the pressure of the additive gas and the pressure of the main component gas Pressure control means for controlling the pressure regulating valve such that the difference between the pressure and the pressure ratio is equal to or greater than the pressure difference corresponding to the mixing ratio.

本発明によると、圧力調整弁を制御する圧力制御手段により、主成分ガスと混合する前の添加ガスの圧力と添加ガスと混合する前の主成分ガスの圧力に応じて、添加ガスの圧力と主成分ガスの圧力との差が、予め設定した混合比率に応じた圧力差以上となるように、添加ガスと混合する前の主成分ガスの圧力を調整する。
このため、添加ガスの圧力と主成分ガスの圧力との差が減少し、主成分ガスの圧力を減少して、添加ガスの圧力と主成分ガスの圧力との差を、予め設定した混合比率に応じた圧力差以上とする際に、主成分ガスの圧力を減少させる減圧幅を、必要な時間帯のみ且つ必要最小限の減圧幅とすることが可能となる。 According to the present invention, by the pressure control means for controlling the pressure regulating valve, the pressure of the additive gas according to the pressure of the additive gas before mixing with the principal component gas and the pressure of the principal component gas before mixing with the additive gas, The pressure of the main component gas before mixing with the additive gas is adjusted so that the difference from the pressure of the main component gas is equal to or greater than the pressure difference corresponding to a preset mixing ratio.
For this reason, the difference between the pressure of the additive gas and the pressure of the main component gas is reduced, the pressure of the main component gas is reduced, and the difference between the pressure of the additive gas and the pressure of the main component gas is set to a preset mixing ratio. When the pressure difference is greater than or equal to the pressure difference, the pressure reduction width for reducing the pressure of the main component gas can be set to the minimum pressure reduction width only in a necessary time zone.

次に、本発明のうち、請求項２に記載した発明は、添加ガスと主成分ガスとを、予め設定した混合比率で混合して混合ガスを製造する混合ガス製造方法であって、
前記主成分ガスと混合する前の前記添加ガスの圧力及び添加ガスと混合する前の主成分ガスの圧力を検出し、当該検出した添加ガスの圧力及び主成分ガスの圧力に応じて、前記主成分ガスの圧力が前記添加ガスの圧力未満であり、且つ前記添加ガスの圧力から前記主成分ガスの圧力を減じた圧力差が少なくとも予め設定した前記混合比率に応じた圧力差未満であるときに、前記添加ガスの圧力と前記主成分ガスの圧力との差が前記混合比率に応じた圧力差以上となるように、前記添加ガスと混合する前の前記主成分ガスの圧力を調整することを特徴とするものである。 Next, among the present inventions, the invention described in claim 2 is a mixed gas production method for producing a mixed gas by mixing an additive gas and a main component gas at a preset mixing ratio,
The pressure of the additive gas before mixing with the main component gas and the pressure of the main component gas before mixing with the additive gas are detected, and the main gas is detected according to the detected pressure of the additive gas and main component gas. When the pressure of the component gas is less than the pressure of the additive gas , and the pressure difference obtained by subtracting the pressure of the main component gas from the pressure of the additive gas is at least less than the pressure difference corresponding to the preset mixing ratio , that difference between the pressure of the main component gas and the pressure of the additive gas to be equal to or greater than the pressure difference corresponding to the mixing ratio, to adjust the pressure of the main component gases prior to mixing with the additive gas It is a feature.

本発明によると、主成分ガスと混合する前の添加ガスの圧力と添加ガスと混合する前の主成分ガスの圧力に応じて、添加ガスの圧力と主成分ガスの圧力との差が、予め設定した混合比率に応じた圧力差以上となるように、添加ガスと混合する前の主成分ガスの圧力を調整する。
このため、添加ガスの圧力と主成分ガスの圧力との差が減少し、主成分ガスの圧力を減少して、添加ガスの圧力と主成分ガスの圧力との差を、予め設定した混合比率に応じた圧力差以上とする際に、主成分ガスの圧力を減少させる減圧幅を、必要な時間帯のみ且つ必要最小限の減圧幅とすることが可能となる。 According to the present invention, depending on the pressure of the additive gas before mixing with the main component gas and the pressure of the main component gas before mixing with the additive gas, the difference between the pressure of the additive gas and the pressure of the main component gas is The pressure of the main component gas before mixing with the additive gas is adjusted so that the pressure difference is equal to or greater than the set mixing ratio.
For this reason, the difference between the pressure of the additive gas and the pressure of the main component gas is reduced, the pressure of the main component gas is reduced, and the difference between the pressure of the additive gas and the pressure of the main component gas is set to a preset mixing ratio. When the pressure difference is greater than or equal to the pressure difference, the pressure reduction width for reducing the pressure of the main component gas can be set to the minimum pressure reduction width only in a necessary time zone.

本発明によれば、添加ガスの圧力と主成分ガスの圧力との差を、予め設定した混合比率に応じた圧力差以上とする際に、主成分ガスの圧力を減少させる減圧幅を、必要な時間帯のみ且つ必要最小限の減圧幅とすることが可能となる。
これにより、混合ガスの製造における、主成分ガスに生じる圧力エネルギーの損失を抑制して、ガスブロワーの所要電力の増加や、ガスブロワーが送出可能な混合ガスの量が減少することを抑制可能となるため、混合ガスの製造に要するランニングコストを減少させることが可能となる。 According to the present invention, when the difference between the pressure of the additive gas and the pressure of the main component gas is equal to or greater than the pressure difference corresponding to the preset mixing ratio, a pressure reduction range for reducing the pressure of the main component gas is required. It is possible to achieve a minimum pressure reduction width only in a necessary time zone.
As a result, it is possible to suppress the loss of pressure energy generated in the main component gas in the production of the mixed gas, and to suppress an increase in the required power of the gas blower and a decrease in the amount of the mixed gas that can be delivered by the gas blower. Therefore, it is possible to reduce the running cost required for producing the mixed gas.

本発明の混合ガス製造装置の概略構成を示す図である。It is a figure which shows schematic structure of the mixed gas manufacturing apparatus of this invention. 本発明のガス混合装置を用いた混合ガス製造方法を実施中における、各種ガスの圧力と、圧力調整弁の開度の経時的な変化を、模式的に表したグラフである。It is the graph which represented typically the change with time of the pressure of various gas, and the opening degree of a pressure control valve in enforcing the mixed gas manufacturing method using the gas mixing device of the present invention. 本発明例のガス混合装置において主成分ガスの圧力を調整した場合の、添加ガスと主成分ガスの圧力バランスを模式的に表したグラフである。It is the graph which represented typically the pressure balance of additive gas and main component gas at the time of adjusting the pressure of main component gas in the gas mixing device of the example of the present invention. 従来例のガス混合装置の概略構成を示す図である。It is a figure which shows schematic structure of the gas mixing apparatus of a prior art example. 従来例のガス混合装置において主成分ガスの圧力を調整していない場合の、添加ガスと主成分ガスの圧力バランスを模式的に表したグラフである。It is the graph which represented typically the pressure balance of additive gas and main component gas when the pressure of main component gas is not adjusted in the gas mixing device of the conventional example. 従来例のガス混合装置において主成分ガスの圧力を調整した場合の、添加ガスと主成分ガスの圧力バランスを模式的に表したグラフである。It is the graph which represented typically the pressure balance of additive gas and main ingredient gas at the time of adjusting the pressure of main ingredient gas in the gas mixing device of the conventional example.

（第一実施形態）
以下、本発明の第一実施形態（以下、「本実施形態」と記載する）について、図面を参照しつつ説明する。
（構成）
まず、図１を用いて、本実施形態の混合ガス製造装置１の具体的な構成について説明する。
図１は、混合ガス製造装置１の概略構成を示す図である。
混合ガス製造装置１は、添加ガスと主成分ガスとを、予め設定した混合比率で混合して、混合ガス（ミックスガス）を製造する装置である。 (First embodiment)
Hereinafter, a first embodiment of the present invention (hereinafter referred to as “the present embodiment”) will be described with reference to the drawings.
(Constitution)
First, the specific structure of the mixed gas manufacturing apparatus 1 of this embodiment is demonstrated using FIG.
FIG. 1 is a diagram showing a schematic configuration of a mixed gas production apparatus 1.
The mixed gas manufacturing apparatus 1 is an apparatus that manufactures a mixed gas (mixed gas) by mixing an additive gas and a main component gas at a preset mixing ratio.

なお、本実施形態では、一例として、添加ガスがコークス炉ガスであり、主成分ガスが転炉ガスである場合について説明する。
この場合、主成分ガス（転炉ガス）が混合ガスの主成分となり、添加ガス（コークス炉ガス）が混合ガスの副成分となる。すなわち、混合ガスを製造する際には、添加ガスであるコークス炉ガスの圧力を、主ガスである転炉ガスの圧力よりも高くした状態で、転炉ガスにコークス炉ガスを添加して、コークス炉ガスと転炉ガスとを混合する。 In the present embodiment, as an example, a case where the additive gas is coke oven gas and the main component gas is converter gas will be described.
In this case, the main component gas (converter gas) is the main component of the mixed gas, and the additive gas (coke oven gas) is the subcomponent of the mixed gas. That is, when the mixed gas is produced, the coke oven gas is added to the converter gas in a state where the pressure of the coke oven gas that is the additive gas is higher than the pressure of the converter gas that is the main gas, Coke oven gas and converter gas are mixed.

また、図１中に示すように、混合ガス製造装置１は、圧力調整弁２と、流量調整弁４と、添加ガス用流量計６と、主成分ガス用流量計８と、流量調節計１０と、混合ガス用圧力計１２と、ガスブロワー１４を備えている。これに加え、混合ガス製造装置１は、添加ガス用圧力検出手段１６と、主成分ガス用圧力検出手段１８と、圧力設定器２０と、圧力調節計２２を備えている。なお、以下の説明では、上述した従来の混合ガス製造装置１と同様の構成に対し、同一の符号を付して説明する。   As shown in FIG. 1, the mixed gas production apparatus 1 includes a pressure regulating valve 2, a flow regulating valve 4, an additive gas flow meter 6, a main component gas flow meter 8, and a flow regulator 10. And a pressure gauge 12 for mixed gas and a gas blower 14. In addition to this, the mixed gas production apparatus 1 includes an additive gas pressure detection means 16, a main component gas pressure detection means 18, a pressure setter 20, and a pressure controller 22. In addition, in the following description, the same code | symbol is attached | subjected and demonstrated with respect to the structure similar to the conventional mixed gas manufacturing apparatus 1 mentioned above.

圧力調整弁２は、主成分ガスの供給経路である主成分ガス用配管２４に設けられており、その開度を変化させることにより、添加ガスと主成分ガスを混合する際の、主成分ガスの圧力を調整可能な弁である。
ここで、主成分ガス用配管２４の最下流側は、主成分ガスを貯蔵する主成分ガスホルダー２６に連通している。すなわち、主成分ガスは、主成分ガスホルダー２６から主成分ガス用配管２４へ供給される。 The pressure regulating valve 2 is provided in a main component gas pipe 24 that is a supply path of the main component gas, and the main component gas when the additive gas and the main component gas are mixed by changing the opening degree thereof. It is a valve that can adjust the pressure of.
Here, the most downstream side of the main component gas pipe 24 communicates with a main component gas holder 26 for storing the main component gas. That is, the main component gas is supplied from the main component gas holder 26 to the main component gas pipe 24.

主成分ガスホルダー２６としては、例えば、昇降するガス槽の上下で貯蔵量を変化させるものがある。このような構造の主成分ガスホルダー２６では、主成分ガスホルダー２６における主成分ガスの貯蔵量が変化すると、この変化に伴って浮上するガス槽の重量が変わるため、主成分ガスホルダー２６の内圧、すなわち、主成分ガスの圧力が段階的に変化する。   As the main component gas holder 26, for example, there is one that changes the storage amount above and below the gas tank that moves up and down. In the main component gas holder 26 having such a structure, when the storage amount of the main component gas in the main component gas holder 26 changes, the weight of the gas tank that floats changes with this change. That is, the pressure of the main component gas changes stepwise.

本実施形態では、主成分ガスホルダー２６の構成を、図１中に示すように、主成分ガスの圧力が三段階に変化する構成とした場合について説明する。
流量調整弁４は、添加ガスの供給経路である添加ガス用配管２８に設けられており、その開度を変化させることにより、添加ガスと主成分ガスを混合する際の、添加ガスの流量を調整可能な弁である。 In the present embodiment, the case where the configuration of the main component gas holder 26 is configured to change the pressure of the main component gas in three stages as shown in FIG. 1 will be described.
The flow rate adjusting valve 4 is provided in an additive gas pipe 28 serving as an additive gas supply path, and the flow rate of the additive gas when the additive gas and the main component gas are mixed is changed by changing the opening degree. It is an adjustable valve.

ここで、添加ガス用配管２８の最下流側は、添加ガスが生成される製鉄所等の配管ネットワーク３０に連通している。すなわち、添加ガスは、配管ネットワーク３０から添加ガス用配管２８へ供給される。
添加ガス用流量計６は、添加ガス用配管２８において、流量調整弁４よりも上流側に設けられており、添加ガス用配管２８における添加ガスの流量を検出し、この検出した添加ガスの流量を含む情報信号を、流量調節計１０へ出力する。 Here, the most downstream side of the additive gas pipe 28 communicates with a pipe network 30 such as a steel mill where the additive gas is generated. That is, the additive gas is supplied from the pipe network 30 to the additive gas pipe 28.
The additive gas flow meter 6 is provided upstream of the flow rate adjusting valve 4 in the additive gas pipe 28, detects the additive gas flow rate in the additive gas pipe 28, and detects the detected additive gas flow rate. Is output to the flow controller 10.

主成分ガス用流量計８は、主成分ガス用配管２４において、圧力調整弁２よりも上流側に設けられており、主成分ガス用配管２４における主成分ガスの流量を検出し、この検出した主成分ガスの流量を含む情報信号を、流量調節計１０へ出力する。
流量調節計１０は、添加ガス用流量計６が検出した添加ガスの流量と、主成分ガス用流量計８が検出した主成分ガスの流量に応じて、添加ガス用配管２８における添加ガスの流量を、混合ガスの製造に必要な値とするために、主成分ガスに対する添加ガスの混合比率が、予め設定した混合比率となる、流量調整弁４の開度を演算する。そして、流量調節計１０は、演算した流量調整弁４の開度を含む情報信号を流量調整弁４へ出力することにより、流量調整弁４を制御する。 The main component gas flow meter 8 is provided upstream of the pressure regulating valve 2 in the main component gas pipe 24, and detects the flow rate of the main component gas in the main component gas pipe 24. An information signal including the flow rate of the main component gas is output to the flow rate controller 10.
The flow rate controller 10 has a flow rate of the additive gas in the additive gas pipe 28 according to the flow rate of the additive gas detected by the additive gas flow meter 6 and the flow rate of the principal component gas detected by the principal component gas flow meter 8. Is set to a value necessary for the production of the mixed gas, the opening degree of the flow rate adjustment valve 4 is calculated so that the mixing ratio of the additive gas to the main component gas becomes a preset mixing ratio. The flow rate controller 10 controls the flow rate adjustment valve 4 by outputting an information signal including the calculated opening degree of the flow rate adjustment valve 4 to the flow rate adjustment valve 4.

混合ガス用圧力計１２は、添加ガス用配管２８と主成分ガス用配管２４が合流した位置よりも下流側の配管である混合ガス用配管３２に設けられており、添加ガスと主成分ガスを混合した混合ガスの圧力を検出する。
ガスブロワー１４は、混合ガス用配管３２において、混合ガス用圧力計１２よりも下流側の位置に設けられており、添加ガスと主成分ガスを混合して製造した混合ガスを昇圧して、混合ガスを消費する加熱炉等のガス消費設備へ送出する。なお、混合ガス製造装置１の構成は、ガスブロワー１４を備えていない構成としてもよい。 The mixed gas pressure gauge 12 is provided in a mixed gas pipe 32 which is a pipe downstream from the position where the additive gas pipe 28 and the main component gas pipe 24 merge. The pressure of the mixed gas mixed is detected.
The gas blower 14 is provided in the mixed gas pipe 32 at a position downstream of the mixed gas pressure gauge 12, and pressurizes and mixes the mixed gas produced by mixing the additive gas and the main component gas. It is sent to gas consuming equipment such as a heating furnace that consumes gas. In addition, the structure of the mixed gas manufacturing apparatus 1 is good also as a structure which is not provided with the gas blower 14. FIG.

ここで、混合ガス製造装置１の構成が、ガスブロワー１４を備えていない構成である場合は、製造された混合ガスは、混合ガスを直接消費する加熱炉等において消費される。また、ガスブロワー１４が混合ガスを送出する設備は、上記のガス消費設備に限定するものではなく、例えば、混合ガスを貯蔵する混合ガスホルダー等であってもよい。
添加ガス用圧力検出手段１６は、例えば、圧力計を用いて形成されており、添加ガス用配管２８において、添加ガス用流量計６と流量調整弁４との間に設けられている。 Here, when the structure of the mixed gas manufacturing apparatus 1 is a structure which is not provided with the gas blower 14, the manufactured mixed gas is consumed in the heating furnace etc. which consume a mixed gas directly. Further, the equipment for the gas blower 14 to send out the mixed gas is not limited to the gas consuming equipment described above, and may be, for example, a mixed gas holder for storing the mixed gas.
The additive gas pressure detection means 16 is formed using, for example, a pressure gauge, and is provided between the additive gas flow meter 6 and the flow rate adjusting valve 4 in the additive gas pipe 28.

また、添加ガス用圧力検出手段１６は、添加ガス用配管２８における添加ガスの圧力を検出し、この検出した添加ガスの圧力を含む情報信号を、圧力設定器２０へ出力する。なお、本実施形態では、添加ガス用圧力検出手段１６を、添加ガス用配管２８において、添加ガス用流量計６よりも下流側に設けているが、これに限定するものではなく、添加ガス用圧力検出手段１６を、添加ガス用配管２８において、添加ガス用流量計６よりも上流側に設けてもよい。
主成分ガス用圧力検出手段１８は、添加ガス用圧力検出手段１６と同様、例えば、圧力計を用いて形成されており、主成分ガス用配管２４において、圧力調整弁２よりも下流側に設けられている。 The additive gas pressure detecting means 16 detects the pressure of the additive gas in the additive gas pipe 28 and outputs an information signal including the detected additive gas pressure to the pressure setting device 20. In the present embodiment, the additive gas pressure detection means 16 is provided in the additive gas pipe 28 on the downstream side of the additive gas flow meter 6. However, the present invention is not limited to this. The pressure detection means 16 may be provided upstream of the additive gas flow meter 6 in the additive gas pipe 28.
The main component gas pressure detecting means 18 is formed by using, for example, a pressure gauge, similar to the additive gas pressure detecting means 16, and is provided downstream of the pressure regulating valve 2 in the main component gas pipe 24. It has been.

また、主成分ガス用圧力検出手段１８は、圧力調整弁２によって調整された主成分ガスの圧力を検出し、この検出した主成分ガスの圧力を含む情報信号を、圧力調節計２２へ出力する。
圧力設定器２０は、添加ガス用圧力検出手段１６が検出した添加ガスの圧力に応じて、添加ガスの圧力と主成分ガスの圧力との差が、予め設定した混合比率に応じた圧力差以上となるような、主成分ガスの圧力を演算し、この演算した主成分ガスの圧力を含む情報信号を、圧力調節計２２へ出力する。 The main component gas pressure detecting means 18 detects the pressure of the main component gas adjusted by the pressure adjusting valve 2, and outputs an information signal including the detected pressure of the main component gas to the pressure regulator 22. .
The pressure setter 20 is configured such that the difference between the pressure of the additive gas and the pressure of the main component gas is equal to or greater than the pressure difference corresponding to the preset mixing ratio, according to the pressure of the additive gas detected by the additive gas pressure detection means 16. Then, the pressure of the main component gas is calculated, and an information signal including the calculated pressure of the main component gas is output to the pressure controller 22.

具体的には、予め設定した混合比率に応じた圧力差を、例えば、０．５[ｋＰａ]とした場合、添加ガス用圧力検出手段１６が検出した添加ガスの圧力が１．５[ｋＰａ]であれば、圧力設定器２０は、主成分ガスの圧力の上限値を、１．０[ｋＰａ]と演算する。
なお、予め設定した混合比率に応じた圧力差は、圧力設定器２０に記憶させておいてもよく、また、圧力設定器２０へ外部から入力してもよい。 Specifically, when the pressure difference corresponding to the preset mixing ratio is, for example, 0.5 [kPa], the pressure of the additive gas detected by the additive gas pressure detection means 16 is 1.5 [kPa]. If so, the pressure setting device 20 calculates the upper limit value of the pressure of the main component gas as 1.0 [kPa].
Note that the pressure difference corresponding to the preset mixing ratio may be stored in the pressure setter 20 or may be input to the pressure setter 20 from the outside.

圧力調節計２２は、主成分ガス用圧力検出手段１８が検出した、圧力調整弁２によって調整された主成分ガスの圧力と、圧力設定器２０が演算した主成分ガスの圧力に応じて、圧力調整弁２の開度を演算する。そして、圧力調節計２２は、演算した圧力調整弁２の開度を含む制御信号を圧力調整弁２へ出力することにより、圧力調整弁２を制御する。
具体的には、圧力調節計２２は、圧力設定器２０が演算した主成分ガスの圧力と、主成分ガス用圧力検出手段１８が検出した主成分ガスの圧力を比較する。そして、主成分ガス用圧力検出手段１８が検出した主成分ガスの圧力が、圧力設定器２０が演算した主成分ガスの圧力以下である場合、圧力調整弁２の開度を、混合ガスの製造に適した開度とする制御信号を、圧力調整弁２へ出力する。 The pressure controller 22 detects the pressure of the main component gas detected by the main component gas pressure detecting means 18 and adjusted by the pressure adjusting valve 2 and the pressure of the main component gas calculated by the pressure setter 20. The opening degree of the regulating valve 2 is calculated. Then, the pressure regulator 22 controls the pressure regulating valve 2 by outputting a control signal including the calculated opening of the pressure regulating valve 2 to the pressure regulating valve 2.
Specifically, the pressure controller 22 compares the pressure of the main component gas calculated by the pressure setting device 20 with the pressure of the main component gas detected by the main component gas pressure detection means 18. When the pressure of the main component gas detected by the main component gas pressure detection means 18 is equal to or lower than the pressure of the main component gas calculated by the pressure setter 20, the opening of the pressure regulating valve 2 is set to produce the mixed gas. Is output to the pressure regulating valve 2.

一方、主成分ガス用圧力検出手段１８が検出した主成分ガスの圧力が、圧力設定器２０が演算した主成分ガスの圧力を超えている場合、主成分ガス用圧力検出手段１８が検出した主成分ガスの圧力が、圧力設定器２０が演算した主成分ガスの圧力以下となるように、圧力調整弁２の開度を演算する。そして、この演算した圧力調整弁２の開度を含む指令信号を、圧力調整弁２へ出力する。
以上により、圧力設定器２０及び圧力調節計２２は、添加ガス用圧力検出手段１６が検出した添加ガスの圧力及び主成分ガス用圧力検出手段１８が検出した主成分ガスの圧力に応じて、添加ガスの圧力と主成分ガスの圧力との差が、予め設定した混合比率に応じた圧力差以上となるように圧力調整弁２を制御する、圧力制御手段を形成する。 On the other hand, when the pressure of the main component gas detected by the main component gas pressure detection unit 18 exceeds the pressure of the main component gas calculated by the pressure setting device 20, the main component gas pressure detection unit 18 detects the main component gas pressure. The opening degree of the pressure regulating valve 2 is calculated so that the pressure of the component gas is equal to or lower than the pressure of the main component gas calculated by the pressure setting device 20. Then, a command signal including the calculated opening of the pressure regulating valve 2 is output to the pressure regulating valve 2.
As described above, the pressure setter 20 and the pressure controller 22 are added in accordance with the pressure of the additive gas detected by the additive gas pressure detector 16 and the pressure of the principal component gas detected by the principal component gas pressure detector 18. A pressure control means is formed for controlling the pressure regulating valve 2 so that the difference between the gas pressure and the main component gas pressure is equal to or greater than a pressure difference corresponding to a preset mixing ratio.

（混合ガス製造方法）
次に、図１を参照しつつ、図２を用いて、上述した構成の混合ガス製造装置１を用いて混合ガスを製造する方法（以下、「混合ガス製造方法」と記載する）について説明する。
本実施形態の混合ガス製造方法では、添加ガス用圧力検出手段１６により、主成分ガスと混合する前の添加ガスの圧力、具体的には、添加ガス用配管２８における添加ガスの圧力を検出し、この検出した添加ガスの圧力を含む情報信号を、圧力設定器２０へ出力する。 (Mixed gas production method)
Next, with reference to FIG. 1, a method for producing a mixed gas using the mixed gas production apparatus 1 having the above-described configuration (hereinafter referred to as “mixed gas production method”) will be described with reference to FIG. .
In the mixed gas manufacturing method of the present embodiment, the additive gas pressure detection means 16 detects the pressure of the additive gas before mixing with the main component gas, specifically, the additive gas pressure in the additive gas pipe 28. Then, an information signal including the detected pressure of the added gas is output to the pressure setter 20.

また、主成分ガス用圧力検出手段１８により、添加ガスと混合する前の主成分ガスの圧力、具体的には、主成分ガス用配管２４において、圧力調整弁２によって調整された主成分ガスの圧力を検出し、この検出した主成分ガスの圧力を含む情報信号を、圧力調節計２２へ出力する。
添加ガス用圧力検出手段１６が出力した情報信号の入力を受けた圧力設定器２０は、添加ガスの圧力と主成分ガスの圧力との差が、予め設定した混合比率に応じた圧力差以上となるような、主成分ガスの圧力を演算し、この演算した主成分ガスの圧力を含む情報信号を、圧力調節計２２へ出力する。
主成分ガス用圧力検出手段１８及び圧力設定器２０が出力した情報信号の入力を受けた圧力調節計２２は、圧力設定器２０が演算した主成分ガスの圧力と、主成分ガス用圧力検出手段１８が検出した主成分ガスの圧力を比較する。 In addition, the pressure of the main component gas before mixing with the additive gas by the main component gas pressure detection means 18, specifically, the main component gas adjusted by the pressure adjustment valve 2 in the main component gas pipe 24. The pressure is detected, and an information signal including the detected pressure of the main component gas is output to the pressure controller 22.
The pressure setter 20 that has received the information signal output from the additive gas pressure detection means 16 has a difference between the additive gas pressure and the main component gas pressure equal to or greater than a pressure difference corresponding to a preset mixing ratio. The pressure of the main component gas is calculated, and an information signal including the calculated pressure of the main component gas is output to the pressure controller 22.
The pressure controller 22 that has received the information signal output from the main component gas pressure detection means 18 and the pressure setter 20 receives the main component gas pressure calculated by the pressure setter 20 and the main component gas pressure detection means. 18 compares the pressure of the main component gas detected.

そして、主成分ガス用圧力検出手段１８が検出した主成分ガスの圧力が、圧力設定器２０が演算した主成分ガスの圧力を超え、図２中に符号「ｔ１」で示す時点のように、この時点ｔ１における添加ガスの圧力Ｐｓｕｂと主成分ガスの圧力Ｐｍａｉｎとの差ΔＰが、予め設定した混合比率に応じた圧力差未満となる場合、圧力調節計２２は、主成分ガス用圧力検出手段１８が検出した主成分ガスの圧力が減圧されて、圧力設定器２０が演算した主成分ガスの圧力以下となるように、圧力調整弁２の開度を演算する。   Then, the pressure of the main component gas detected by the main component gas pressure detecting means 18 exceeds the pressure of the main component gas calculated by the pressure setter 20, and as shown in FIG. When the difference ΔP between the pressure Psub of the additive gas and the pressure Pmain of the main component gas at this time t1 is less than the pressure difference corresponding to the preset mixing ratio, the pressure controller 22 detects the pressure detection means for the main component gas. The degree of opening of the pressure regulating valve 2 is calculated so that the pressure of the main component gas detected by 18 is reduced to be equal to or lower than the pressure of the main component gas calculated by the pressure setter 20.

なお、図２は、本実施形態のガス混合装置１を用いた混合ガス製造方法を実施中における、各種ガスの圧力と、圧力調整弁２の開度Ｖｔの経時的な変化を、模式的に表したグラフである。ここで、「各種ガスの圧力」とは、主成分ガスホルダー２６から主成分ガス用配管２４へ供給される主成分ガスの圧力Ｐｓｕｐｐと、添加ガス用圧力検出手段１６が検出した添加ガスの圧力Ｐｓｕｂと、主成分ガス用圧力検出手段１８が検出した主成分ガスの圧力Ｐｍａｉｎである。   FIG. 2 schematically shows changes over time in the pressures of various gases and the opening degree Vt of the pressure regulating valve 2 during the implementation of the mixed gas production method using the gas mixing device 1 of the present embodiment. It is a represented graph. Here, the “pressures of various gases” are the pressure Psupp of the main component gas supplied from the main component gas holder 26 to the main component gas pipe 24 and the pressure of the added gas detected by the added gas pressure detecting means 16. Psub and the pressure Pmain of the main component gas detected by the main component gas pressure detection means 18.

また、図２中では、左側の縦軸にガス(添加ガス、主成分ガス）の圧力（図中では、「ガス圧力」と記載する）を示し、右側の縦軸に圧力調整弁２の開度（図中では、「バルブ開度」と記載する）を示し、横軸に経過時間（図中では、「時間」と記載する）を示している。
圧力調節計２２が、上述したように圧力調整弁２の開度を演算し、演算した圧力調整弁２の開度を含む制御信号を圧力調整弁２へ出力すると、図２中に示されているように、時点ｔ１において、圧力調整弁２の開度Ｖｔが減少する。 In FIG. 2, the vertical axis on the left indicates the pressure of the gas (added gas, main component gas) (denoted as “gas pressure” in the figure), and the vertical axis on the right indicates the opening of the pressure regulating valve 2. The degree (denoted as “valve opening” in the figure) is shown, and the elapsed time (denoted as “time” in the figure) is shown on the horizontal axis.
When the pressure regulator 22 calculates the opening degree of the pressure regulating valve 2 as described above and outputs a control signal including the computed opening degree of the pressure regulating valve 2 to the pressure regulating valve 2, it is shown in FIG. As shown, the opening Vt of the pressure regulating valve 2 decreases at time t1.

時点ｔ１において、圧力調整弁２の開度Ｖｔが減少すると、この減少に伴い、主成分ガス用圧力検出手段１８が検出した主成分ガスの圧力Ｐｍａｉｎが減少を開始する。ここで、圧力調整弁２の開度Ｖｔが減少する時点ｔ１と、主成分ガス用圧力検出手段１８が検出した主成分ガスの圧力Ｐｍａｉｎが減少を開始する時点ｔ２には、タイムラグ（ｔ１からｔ２の間の時間）が発生する。
時点ｔ２において、主成分ガス用圧力検出手段１８が検出した主成分ガスの圧力Ｐｍａｉｎが減少を開始すると、時点ｔ２以降において、添加ガスの圧力Ｐｓｕｂと主成分ガスの圧力Ｐｍａｉｎとの差が、予め設定した混合比率に応じた圧力差以上となる。 When the opening degree Vt of the pressure regulating valve 2 decreases at the time t1, the main component gas pressure Pmain detected by the main component gas pressure detecting means 18 starts to decrease. Here, there is a time lag (from t1 to t2) between the time point t1 when the opening degree Vt of the pressure regulating valve 2 decreases and the time point t2 when the main component gas pressure Pmain detected by the main component gas pressure detecting means 18 starts decreasing. Time).
When the main component gas pressure Pmain detected by the main component gas pressure detecting means 18 starts to decrease at time t2, the difference between the pressure Psub of the additive gas and the pressure Pmain of the main component gas after time t2 is determined in advance. The pressure difference is greater than or equal to the set mixing ratio.

そして、図２中に符号「ｔ３」で示す時点のように、添加ガスの圧力Ｐｓｕｂが増加して、添加ガスの圧力Ｐｓｕｂと主成分ガスの圧力Ｐｍａｉｎとの差が、予め設定した混合比率に応じた圧力差以上となる状態が確保され、主成分ガス用圧力検出手段１８が検出した主成分ガスの圧力Ｐｍａｉｎが、圧力設定器２０が演算した主成分ガスの圧力以下となる状態が確保されると、圧力調節計２２は、主成分ガス用圧力検出手段１８が検出した主成分ガスの圧力が、減圧した状態から増圧するように、圧力調整弁２の開度を演算する。
圧力調節計２２が、上述したように圧力調整弁２の開度を演算し、演算した圧力調整弁２の開度を含む制御信号を圧力調整弁２へ出力すると、図２中に示されているように、時点ｔ３において、減少していた圧力調整弁２の開度Ｖｔが増加する。 Then, as indicated by the symbol “t3” in FIG. 2, the pressure Psub of the additive gas increases, and the difference between the pressure Psub of the additive gas and the pressure Pmain of the main component gas becomes a preset mixing ratio. A state in which the pressure difference is greater than or equal to the corresponding pressure difference is ensured, and a state in which the pressure Pmain of the main component gas detected by the main component gas pressure detection means 18 is less than or equal to the pressure of the main component gas calculated by the pressure setter 20 is ensured. Then, the pressure regulator 22 calculates the opening degree of the pressure regulating valve 2 so that the pressure of the main component gas detected by the main component gas pressure detecting means 18 increases from the reduced pressure.
When the pressure regulator 22 calculates the opening degree of the pressure regulating valve 2 as described above and outputs a control signal including the computed opening degree of the pressure regulating valve 2 to the pressure regulating valve 2, it is shown in FIG. As shown, at time t3, the opening degree Vt of the pressure regulating valve 2 that has decreased is increased.

以上により、本実施形態の混合ガス製造方法では、主成分ガスと混合する前の添加ガスの圧力と、添加ガスと混合する前の主成分ガスの圧力を検出する。そして、これらの検出した添加ガスの圧力及び主成分ガスの圧力に応じて、添加ガスの圧力と主成分ガスの圧力との差が、予め設定した混合比率に応じた圧力差以上となるように、添加ガスと混合する前の主成分ガスの圧力を調整する。
また、本実施形態の混合ガス製造方法では、主成分ガスホルダー２６から供給される主成分ガスの圧力は、主成分ガスホルダー２６における主成分ガスの貯蔵量の変化に伴って、三段階に、段階的に変化するため、この段階的に変化する主成分ガスの圧力を、添加ガスの圧力の変化に応じて調整する。 As described above, in the mixed gas manufacturing method of the present embodiment, the pressure of the additive gas before mixing with the main component gas and the pressure of the main component gas before mixing with the additive gas are detected. Then, according to the detected pressure of the additive gas and the pressure of the main component gas, the difference between the pressure of the additive gas and the pressure of the main component gas is equal to or greater than the pressure difference according to the preset mixing ratio. The pressure of the main component gas before mixing with the additive gas is adjusted.
Further, in the mixed gas manufacturing method of the present embodiment, the pressure of the main component gas supplied from the main component gas holder 26 is divided into three stages according to the change in the storage amount of the main component gas in the main component gas holder 26. Since the pressure changes in a stepwise manner, the pressure of the main component gas that changes in a stepwise manner is adjusted in accordance with a change in the pressure of the additive gas.

（第一実施形態の効果）
以下、本実施形態の効果を列挙する。
（１）本実施形態の混合ガス製造装置１では、圧力調整弁２を制御する圧力制御手段により、主成分ガスと混合する前の添加ガスの圧力と添加ガスと混合する前の主成分ガスの圧力に応じて、添加ガスの圧力と主成分ガスの圧力との差が、予め設定した混合比率に応じた圧力差以上となるように、添加ガスと混合する前の主成分ガスの圧力を調整する。 (Effects of the first embodiment)
The effects of this embodiment are listed below.
(1) In the mixed gas manufacturing apparatus 1 of the present embodiment, the pressure control means for controlling the pressure regulating valve 2 controls the pressure of the additive gas before mixing with the main component gas and the main component gas before mixing with the additive gas. According to the pressure, the pressure of the main component gas before mixing with the additive gas is adjusted so that the difference between the pressure of the additive gas and the pressure of the main component gas is equal to or greater than the pressure difference according to the preset mixing ratio. To do.

このため、添加ガスの圧力と主成分ガスの圧力との差が減少し、主成分ガスの圧力を減少して、添加ガスの圧力と主成分ガスの圧力との差を、予め設定した混合比率に応じた圧力差以上とする際に、主成分ガスの圧力を減少させる減圧幅を、必要な時間帯のみ且つ必要最小限の減圧幅とすることが可能となる。
その結果、混合ガスの製造における、主成分ガスに生じる圧力エネルギーの損失を抑制して、ガスブロワー１４の所要電力の増加や、ガスブロワー１４が送出可能な混合ガスの量が減少することを抑制可能となるため、混合ガスの製造に要するランニングコストを減少させることが可能となる。 For this reason, the difference between the pressure of the additive gas and the pressure of the main component gas is reduced, the pressure of the main component gas is reduced, and the difference between the pressure of the additive gas and the pressure of the main component gas is set to a preset mixing ratio. When the pressure difference is greater than or equal to the pressure difference, the pressure reduction width for reducing the pressure of the main component gas can be set to the minimum pressure reduction width only in a necessary time zone.
As a result, the loss of pressure energy generated in the main component gas in the production of the mixed gas is suppressed, and the increase in the required power of the gas blower 14 and the decrease in the amount of the mixed gas that can be delivered by the gas blower 14 are suppressed. Therefore, the running cost required for the production of the mixed gas can be reduced.

（２）本実施形態の混合ガス製造装置１では、主成分ガスホルダー２６から供給される主成分ガスの圧力が、主成分ガスを貯蔵する主成分ガスホルダー２６における、主成分ガスの貯蔵量の変化に伴って、三段階に、段階的に変化する。
このため、段階的に変化する主成分ガスの圧力を、添加ガスの圧力の変化に応じて、調整することが可能となる。
その結果、主成分ガスの圧力が、貯蔵量の変化に伴って段階的に変化する主成分ガスホルダー２６を備える設備に対し、主成分ガスの圧力を減少させる減圧幅を、例えば、主成分ガスの圧力が最大値の段階となる時間帯等、必要な時間帯に絞り込むことが容易となる。 (2) In the mixed gas manufacturing apparatus 1 of the present embodiment, the pressure of the main component gas supplied from the main component gas holder 26 is the amount of the main component gas stored in the main component gas holder 26 that stores the main component gas. As it changes, it changes in three steps.
For this reason, it becomes possible to adjust the pressure of the main component gas which changes in steps according to the change in the pressure of the additive gas.
As a result, for a facility including the main component gas holder 26 in which the pressure of the main component gas changes stepwise as the storage amount changes, a reduced pressure width for reducing the pressure of the main component gas is set to, for example, the main component gas. It becomes easy to narrow down to a required time zone such as a time zone in which the pressure of the gas reaches the maximum value stage.

（３）本実施形態の混合ガス製造方法では、主成分ガスと混合する前の添加ガスの圧力と添加ガスと混合する前の主成分ガスの圧力に応じて、添加ガスの圧力と主成分ガスの圧力との差が、予め設定した混合比率に応じた圧力差以上となるように、添加ガスと混合する前の主成分ガスの圧力を調整する。
このため、添加ガスの圧力と主成分ガスの圧力との差が減少し、主成分ガスの圧力を減少して、添加ガスの圧力と主成分ガスの圧力との差を、予め設定した混合比率に応じた圧力差以上とする際に、主成分ガスの圧力を減少させる減圧幅を、必要な時間帯のみ且つ必要最小限の減圧幅とすることが可能となる。
その結果、混合ガスの製造における、主成分ガスに生じる圧力エネルギーの損失を抑制して、ガスブロワー１４の所要電力の増加や、ガスブロワー１４が送出可能な混合ガスの量が減少することを抑制可能となるため、混合ガスの製造に要するランニングコストを減少させることが可能となる。 (3) In the mixed gas manufacturing method of the present embodiment, the pressure of the additive gas and the main component gas according to the pressure of the additive gas before mixing with the main component gas and the pressure of the main component gas before mixing with the additive gas. The pressure of the main component gas before mixing with the additive gas is adjusted so that the difference from the above pressure becomes equal to or greater than the pressure difference corresponding to the preset mixing ratio.
For this reason, the difference between the pressure of the additive gas and the pressure of the main component gas is reduced, the pressure of the main component gas is reduced, and the difference between the pressure of the additive gas and the pressure of the main component gas is set to a preset mixing ratio. When the pressure difference is greater than or equal to the pressure difference, the pressure reduction width for reducing the pressure of the main component gas can be set to the minimum pressure reduction width only in a necessary time zone.
As a result, the loss of pressure energy generated in the main component gas in the production of the mixed gas is suppressed, and the increase in the required power of the gas blower 14 and the decrease in the amount of the mixed gas that can be delivered by the gas blower 14 are suppressed. Therefore, the running cost required for the production of the mixed gas can be reduced.

（４）本実施形態の混合ガス製造方法では、主成分ガスホルダー２６から供給される主成分ガスの圧力が、主成分ガスホルダー２６における主成分ガスの貯蔵量の変化に伴って、三段階に、段階的に変化する。
このため、段階的に変化する主成分ガスの圧力を、添加ガスの圧力の変化に応じて、調整することが可能となる。
その結果、主成分ガスの圧力が、貯蔵量の変化に伴って段階的に変化する主成分ガスホルダー２６を備える設備に対し、主成分ガスの圧力を減少させる減圧幅を、例えば、主成分ガスの圧力が最大値の段階となる時間帯等、必要な時間帯に絞り込むことが容易となる。 (4) In the mixed gas manufacturing method of the present embodiment, the pressure of the main component gas supplied from the main component gas holder 26 is changed in three stages according to the change in the storage amount of the main component gas in the main component gas holder 26. , Change step by step.
For this reason, it becomes possible to adjust the pressure of the main component gas which changes in steps according to the change in the pressure of the additive gas.
As a result, for a facility including the main component gas holder 26 in which the pressure of the main component gas changes stepwise as the storage amount changes, a reduced pressure width for reducing the pressure of the main component gas is set to, for example, the main component gas. It becomes easy to narrow down to a required time zone such as a time zone in which the pressure of the gas reaches the maximum value stage.

（応用例）
以下、本実施形態の応用例を列挙する。
（１）本実施形態の混合ガス製造装置１及び混合ガス製造方法では、添加ガスをコークス炉ガスとし、主成分ガスを転炉ガスとしたが、添加ガス及び主成分ガスの種類は、上述した種類に限定するものではない。
（２）本実施形態の混合ガス製造装置１及び混合ガス製造方法では、主成分ガスを、主成分ガスの貯蔵量の変化に伴って、主成分ガスの圧力が段階的に変化する主成分ガスホルダーに貯蔵し、主成分ガス用配管２４に供給する構成としたが、これに限定するものではない。すなわち、主成分ガスを、例えば、上述した添加ガスのように、配管ネットワークから配管へ供給される構成としてもよい。 (Application examples)
Hereinafter, application examples of this embodiment will be listed.
(1) In the mixed gas manufacturing apparatus 1 and the mixed gas manufacturing method of the present embodiment, the additive gas is coke oven gas and the main component gas is converter gas, but the types of additive gas and main component gas have been described above. The type is not limited.
(2) In the mixed gas manufacturing apparatus 1 and the mixed gas manufacturing method of the present embodiment, the main component gas is a main component gas in which the pressure of the main component gas changes stepwise as the stored amount of the main component gas changes. Although it was set as the structure which stores in a holder and supplies to the main component gas piping 24, it is not limited to this. In other words, the main component gas may be supplied from the pipe network to the pipe as in the additive gas described above, for example.

（実施例）
以下、図１及び図２、図４から図６を参照しつつ、図３を用いて、本発明例及び比較例の混合ガス製造装置１を用いて、本発明例の混合ガス製造装置１が奏する効果を検証した結果について説明する。
なお、本実施例では、上述した第一実施形態と同様、添加ガスをコークス炉ガスとし、主成分ガスを転炉ガスとした。 (Example)
Hereinafter, referring to FIG. 1 and FIG. 2, and FIG. 4 to FIG. 6, using FIG. 3, the mixed gas production apparatus 1 of the present invention example is used. The result of verifying the effect to play is demonstrated.
In this example, as in the first embodiment described above, the additive gas was coke oven gas and the main component gas was converter gas.

本発明例の混合ガス製造装置１は、その構成を、上述した第一実施形態と同様の構成とした。なお、主成分ガス用配管２４の配管口径（内径）を８００[Ａ]とし、添加ガス用配管２８の配管口径（内径）を１７００[φ]とする。これに伴い、圧力調整弁２の内径を８００[Ａ]とし、流量調整弁４の内径を１７００[φ]とする。
一方、比較例の混合ガス製造装置１は、その構成を、図４中に示した従来例と同様の構成とした。 The mixed gas manufacturing apparatus 1 of the present invention example has the same configuration as that of the first embodiment described above. The pipe diameter (inner diameter) of the main component gas pipe 24 is 800 [A], and the pipe diameter (inner diameter) of the additive gas pipe 28 is 1700 [φ]. Accordingly, the inner diameter of the pressure regulating valve 2 is set to 800 [A], and the inner diameter of the flow regulating valve 4 is set to 1700 [φ].
On the other hand, the mixed gas production apparatus 1 of the comparative example has the same configuration as the conventional example shown in FIG.

また、本発明例及び比較例の混合ガス製造装置１を用いて、混合ガスを製造する際には、添加ガス用圧力検出手段１６が検出した添加ガスの圧力が、２．８〜３．５[ｋＰａ]の範囲内で変動している条件下で行う。なお、この圧力変動は、配管ネットワーク３０内における潮流変化により発生するものである。
さらに、本発明例及び比較例の混合ガス製造装置１を用いて、混合ガスを製造する際には、主成分ガスホルダー２６から主成分ガス用配管２４へ供給される主成分ガスの圧力が、１．４〜３．２[ｋＰａ]の範囲内で変動している条件下で行う。なお、この圧力変動は、主成分ガスホルダー２６における貯蔵量の変化により発生するものである。 Further, when the mixed gas is manufactured using the mixed gas manufacturing apparatus 1 of the present invention example and the comparative example, the pressure of the additive gas detected by the additive gas pressure detecting means 16 is 2.8 to 3.5. The measurement is performed under conditions that vary within the range of [kPa]. Note that this pressure fluctuation is caused by a tidal flow change in the piping network 30.
Furthermore, when the mixed gas is manufactured using the mixed gas manufacturing apparatus 1 of the present invention example and the comparative example, the pressure of the main component gas supplied from the main component gas holder 26 to the main component gas pipe 24 is The measurement is performed under conditions varying within the range of 1.4 to 3.2 [kPa]. Note that this pressure fluctuation is caused by a change in the storage amount in the main component gas holder 26.

また、本発明例及び比較例の混合ガス製造装置１を用いて、混合ガスを製造する際には、添加ガスと主成分ガスとを混合するための、予め設定した混合比率に応じた圧力差を、０．５[ｋＰａ]とする。
そして、比較例の混合ガス製造装置１を用いて、混合ガスを製造した場合、添加ガスの圧力Ｐｓｕｂと主成分ガスの圧力Ｐｍａｉｎが同一、または、主成分ガスの圧力Ｐｍａｉｎが添加ガスの圧力Ｐｓｕｂよりも大きくなった場合に、主成分ガスの圧力を常時減圧した（図５及び図６参照）。 Further, when the mixed gas is manufactured using the mixed gas manufacturing apparatus 1 of the present invention example and the comparative example, a pressure difference corresponding to a preset mixing ratio for mixing the additive gas and the main component gas. Is 0.5 [kPa].
When the mixed gas is manufactured using the mixed gas manufacturing apparatus 1 of the comparative example, the pressure Psub of the additive gas and the pressure Pmain of the main component gas are the same, or the pressure Pmain of the main component gas is the pressure Psub of the additive gas. When it became larger than that, the pressure of the main component gas was constantly reduced (see FIGS. 5 and 6).

一方、本発明例の混合ガス製造装置１を用いて、混合ガスを製造した場合、図３中に示すように、主成分ガスと混合する前の添加ガスの圧力と添加ガスと混合する前の主成分ガスの圧力に応じて、添加ガスの圧力Ｐｓｕｂと主成分ガスの圧力Ｐｍａｉｎとの差が、予め設定した混合比率に応じた圧力差以上となるように、添加ガスと混合する前の主成分ガスの圧力を調整した。   On the other hand, when a mixed gas is manufactured using the mixed gas manufacturing apparatus 1 of the present invention example, as shown in FIG. 3, the pressure of the additive gas before mixing with the main component gas and the mixture before the additive gas are mixed. Depending on the pressure of the main component gas, the main gas before mixing with the additive gas so that the difference between the pressure Psub of the additive gas and the pressure Pmain of the main component gas is equal to or greater than the pressure difference corresponding to the preset mixing ratio. The pressure of the component gas was adjusted.

なお、図３は、本発明例のガス混合装置１において主成分ガスの圧力を調整した場合の、添加ガスと主成分ガスの圧力バランスを模式的に表したグラフである。また、図３中では、図５及び図６と同様、縦軸にガス(添加ガス、主成分ガス）の圧力（図中では、「ガス圧力」と記載する）を示し、横軸に経過時間（図中では、「時間」と記載する）を示している。   FIG. 3 is a graph schematically showing the pressure balance between the additive gas and the main component gas when the pressure of the main component gas is adjusted in the gas mixing apparatus 1 of the present invention. In FIG. 3, as in FIGS. 5 and 6, the vertical axis indicates the pressure of the gas (added gas, main component gas) (denoted as “gas pressure” in the figure), and the horizontal axis indicates the elapsed time. (Denoted as “time” in the figure).

すなわち、本発明例の混合ガス製造装置１を用いて、混合ガスを製造した場合、添加ガスの圧力と主成分ガスの圧力との差が減少し、主成分ガスの圧力を減少して、添加ガスの圧力と主成分ガスの圧力との差を、予め設定した混合比率に応じた圧力差以上とする際に、主成分ガスの圧力を減少させる減圧幅を、必要な時間帯のみ且つ必要最小限の減圧幅とすることが可能となる。なお、図３中には、上述した必要な時間帯を、符号「Ｔｚ１」で示し、上述した必要最小限の減圧幅を、「Ｐｗｍｉｎ」で示している。   That is, when a mixed gas is manufactured using the mixed gas manufacturing apparatus 1 of the present invention example, the difference between the pressure of the additive gas and the pressure of the main component gas is reduced, and the pressure of the main component gas is decreased and added. When the difference between the gas pressure and the main component gas pressure is equal to or greater than the pressure difference corresponding to the preset mixing ratio, the pressure reduction range for decreasing the main component gas pressure is only necessary and the minimum required. It becomes possible to set the pressure reduction width to the limit. In FIG. 3, the above-described necessary time zone is indicated by a symbol “Tz1”, and the above-described necessary minimum decompression width is indicated by “Pwmin”.

したがって、本発明例及び比較例の混合ガス製造装置１に対して、混合ガスの製造時における、添加ガスの圧力と主成分ガスの圧力との差を、予め設定した混合比率に応じた圧力差以上とする際に、主成分ガスの圧力を減少させる減圧幅と、主成分ガスの圧力を減少させる時間を比較した結果、本発明例の混合ガス製造装置１では、比較例の混合ガス製造装置１よりも、主成分ガスの圧力を減少させる減圧幅及び時間を減少させることが可能であることが確認された。
これにより、本発明例の混合ガス製造装置１は、比較例の混合ガス製造装置１よりも、混合ガスの製造に要するランニングコストを減少させることが可能となることが確認された。 Therefore, with respect to the mixed gas production apparatus 1 of the present invention example and the comparative example, the difference between the pressure of the additive gas and the pressure of the main component gas during the production of the mixed gas, As a result of comparing the reduced pressure width for reducing the pressure of the main component gas and the time for reducing the pressure of the main component gas in the above, the mixed gas manufacturing apparatus 1 of the present invention example is a mixed gas manufacturing apparatus of the comparative example. It was confirmed that the pressure reduction width and time for reducing the pressure of the main component gas can be reduced more than 1.
Thereby, it was confirmed that the mixed gas manufacturing apparatus 1 of the example of the present invention can reduce the running cost required for manufacturing the mixed gas more than the mixed gas manufacturing apparatus 1 of the comparative example.

また、本発明例の混合ガス製造装置１は、比較例の混合ガス製造装置１と比較して、時間帯Ｔｚ１以外の時間帯において、圧力調整弁２の開度を減少させなくとも、添加ガスと主成分ガスとを混合するための圧力に、十分な圧力差を確保することが可能となるため、圧力調整弁２の開度を全開として、減圧ロスを減少させることが可能となることが確認された。   Further, the mixed gas production apparatus 1 of the present invention example does not reduce the opening of the pressure regulating valve 2 in the time zone other than the time zone Tz1 as compared with the mixed gas production apparatus 1 of the comparative example. It is possible to secure a sufficient pressure difference in the pressure for mixing the main component gas and the main component gas, so that the decompression loss can be reduced by fully opening the pressure regulating valve 2. confirmed.

１ 混合ガス製造装置
２ 圧力調整弁
４ 流量調整弁
６ 添加ガス用流量計
８ 主成分ガス用流量計
１０ 流量調節計
１２ 混合ガス用圧力計
１４ ガスブロワー
１６ 添加ガス用圧力検出手段
１８ 主成分ガス用圧力検出手段
２０ 圧力設定器
２２ 圧力調節計
２４ 主成分ガス用配管
２６ 主成分ガスホルダー
２８ 添加ガス用配管
３０ 配管ネットワーク
３２ 混合ガス用配管
３４ 開度調節計
Ｐｓｕｐｐ 主成分ガスホルダー２６から主成分ガス用配管２４へ供給される主成分ガスの圧力
Ｐｓｕｂ 添加ガス用圧力検出手段１６が検出した添加ガスの圧力
Ｐｍａｉｎ 主成分ガス用圧力検出手段１８が検出した主成分ガスの圧力
ΔＰ 添加ガスの圧力Ｐｓｕｂと主成分ガスの圧力Ｐｍａｉｎとの差
Ｖｔ 圧力調整弁２の開度 DESCRIPTION OF SYMBOLS 1 Mixed gas manufacturing apparatus 2 Pressure control valve 4 Flow control valve 6 Flow meter for additive gas 8 Flow meter for main component gas 10 Flow controller 12 Pressure meter for mixed gas 14 Gas blower 16 Pressure detection means for additive gas 18 Main component gas Pressure detection means 20 Pressure setting device 22 Pressure controller 24 Main component gas piping 26 Main component gas holder 28 Additional gas piping 30 Piping network 32 Mixed gas piping 34 Opening controller Psupp Main component gas holder 26 to main component Pressure of main component gas supplied to gas pipe 24 Psub Pressure of added gas detected by additive gas pressure detecting means 16 Pmain Pressure of main component gas detected by main gas pressure detecting means 18 ΔP Pressure of added gas Difference between Psub and main component gas pressure Pmain Vt Opening of pressure regulating valve 2

Claims (2)

添加ガスと主成分ガスとを、予め設定した混合比率で混合して混合ガスを製造する混合ガス製造装置であって、
前記主成分ガスと混合する前の前記添加ガスの圧力を検出する添加ガス用圧力検出手段と、
前記添加ガスと混合する前の前記主成分ガスの圧力を検出する主成分ガス用圧力検出手段と、
前記添加ガスと混合する前の前記主成分ガスの圧力を調整する圧力調整弁と、
前記添加ガス用圧力検出手段が検出した添加ガスの圧力及び前記主成分ガス用圧力検出手段が検出した主成分ガスの圧力に応じて、前記主成分ガスの圧力が前記添加ガスの圧力未満であり、且つ前記添加ガスの圧力から前記主成分ガスの圧力を減じた圧力差が少なくとも予め設定した前記混合比率に応じた圧力差未満であるときに、前記添加ガスの圧力と前記主成分ガスの圧力との差が前記混合比率に応じた圧力差以上となるように、前記圧力調整弁を制御する圧力制御手段と、を備えることを特徴とする混合ガス製造装置。 A mixed gas production apparatus for producing a mixed gas by mixing an additive gas and a main component gas at a preset mixing ratio,
Pressure detection means for additive gas for detecting the pressure of the additive gas before mixing with the main component gas;
Pressure detecting means for main component gas for detecting the pressure of the main component gas before mixing with the additive gas;
A pressure adjusting valve for adjusting the pressure of the main component gas before mixing with the additive gas;
Depending on the pressure of the additive gas detected by the additive gas pressure detection means and the pressure of the principal component gas detected by the principal component gas pressure detection means, the pressure of the principal component gas is less than the pressure of the additive gas . When the pressure difference obtained by subtracting the pressure of the main component gas from the pressure of the additive gas is less than the pressure difference corresponding to at least the preset mixing ratio, the pressure of the additive gas and the pressure of the main component gas And a pressure control means for controlling the pressure regulating valve so that the difference between the two and the pressure ratio is equal to or greater than the pressure difference according to the mixing ratio. 添加ガスと主成分ガスとを、予め設定した混合比率で混合して混合ガスを製造する混合ガス製造方法であって、
前記主成分ガスと混合する前の前記添加ガスの圧力及び添加ガスと混合する前の主成分ガスの圧力を検出し、当該検出した添加ガスの圧力及び主成分ガスの圧力に応じて、前記主成分ガスの圧力が前記添加ガスの圧力未満であり、且つ前記添加ガスの圧力から前記主成分ガスの圧力を減じた圧力差が少なくとも予め設定した前記混合比率に応じた圧力差未満であるときに、前記添加ガスの圧力と前記主成分ガスの圧力との差が前記混合比率に応じた圧力差以上となるように、前記添加ガスと混合する前の前記主成分ガスの圧力を調整することを特徴とする混合ガス製造方法。 A mixed gas production method for producing a mixed gas by mixing an additive gas and a main component gas at a preset mixing ratio,
The pressure of the additive gas before mixing with the main component gas and the pressure of the main component gas before mixing with the additive gas are detected, and the main gas is detected according to the detected pressure of the additive gas and main component gas. When the pressure of the component gas is less than the pressure of the additive gas , and the pressure difference obtained by subtracting the pressure of the main component gas from the pressure of the additive gas is at least less than the pressure difference corresponding to the preset mixing ratio , that difference between the pressure of the main component gas and the pressure of the additive gas to be equal to or greater than the pressure difference corresponding to the mixing ratio, to adjust the pressure of the main component gases prior to mixing with the additive gas A method for producing a mixed gas.
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