JP2010249318A - Gas supplying method - Google Patents

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JP2010249318A
JP2010249318A JP2010118191A JP2010118191A JP2010249318A JP 2010249318 A JP2010249318 A JP 2010249318A JP 2010118191 A JP2010118191 A JP 2010118191A JP 2010118191 A JP2010118191 A JP 2010118191A JP 2010249318 A JP2010249318 A JP 2010249318A
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pressure gas
gas holder
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holder
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JP5012955B2 (en
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Toshihiko Kukutsu
寿彦 久々津
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JFE Steel Corp
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JFE Steel Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To optimize the gas storing ability in a gas supply line without wasting the gas storing ability. <P>SOLUTION: When the relation between the pressure of a low-pressure gas holder 9 and the pressure of a high-pressure gas holder 7 is (the pressure of the low-pressure gas holder)>(the pressure of the high-pressure gas holder), and the pressure of the low-pressure gas holder is the lower limit set value or more, a flow rate control valve 8 is opened to feed the gas of the low-pressure gas holder to the high-pressure gas holder in addition, and when (the pressure of the low-pressure gas holder)≤(the pressure of the high-pressure gas holder) and the pressure of the low-pressure gas holder is the lower limit set value or more and the pressure of the high-pressure gas holder is less than the upper limit set value, the flow rate control valve is closed to supply the gas of the low-pressure gas holder to the only low-pressure gas using facility 12. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、高圧ガス使用設備用の高圧ガスホルダと低圧ガス使用設備用の低圧ガスホルダを介してそれぞれの設備にガスの供給を行うガス供給ラインにおけるガス供給方法に関する。   The present invention relates to a gas supply method in a gas supply line that supplies gas to each facility via a high-pressure gas holder for a high-pressure gas use facility and a low-pressure gas holder for a low-pressure gas use facility.

一貫製鉄所においては、種々のガスが利用されているが、例えば、多量の酸素ガスが高炉、転炉等での生産に使用されている。
一貫製鉄所において使用される酸素ガスの供給ラインの例を図1に模式的に示す。
大気中から取り込んだ空気は、空気圧縮機1で圧縮を行い、水洗冷却塔2で冷却した後、モリキュラシーブス吸着器3で分子ふるいにかけ、コールドボックス4内の精留塔で精留して最終的に酸素を分離する。そして、酸素圧縮機5で昇圧(圧縮)して所要の圧力の圧縮酸素ガスを得る。
In the integrated steelworks, various gases are used. For example, a large amount of oxygen gas is used for production in a blast furnace, a converter, and the like.
An example of an oxygen gas supply line used in an integrated steelworks is schematically shown in FIG.
The air taken in from the atmosphere is compressed by the air compressor 1, cooled by the water-cooled cooling tower 2, passed through a molecular sieve by a molecular sieve adsorber 3, and rectified by a rectifying tower in the cold box 4. Finally, oxygen is separated. Then, the pressure is increased (compressed) by the oxygen compressor 5 to obtain compressed oxygen gas having a required pressure.

ここで得られた圧縮酸素ガスは、供給先の使用圧力に応じて、高圧と低圧の2つのホルダ(ガスタンク)に供給されて貯蔵される。
高炉に代表される低圧ガス使用設備12に対しては、低圧ガスホルダ9から酸素ガスが供給され、転炉に代表される高圧ガス使用設備13に対しては、高圧ガスホルダ7から酸素ガスが供給される。そして、これら低圧ガスホルダ9と高圧ガスホルダ7で上述の圧縮された酸素が各ガス使用設備において必要な圧力に調整される。ここで、低圧ガスホルダ9の入側部には流量調節弁8が付設されている。なお、6は酸素放散弁である。シーケンス制御装置11には、圧力計10a 、10b で計測された低圧ガスホルダ9と高圧ガスホルダ7の圧力値が入力され、それらの圧力値を基にして流量調節弁8と酸素放散弁6の制御が行われる。
The compressed oxygen gas obtained here is supplied and stored in two high-pressure and low-pressure holders (gas tanks) according to the operating pressure of the supply destination.
Oxygen gas is supplied from the low-pressure gas holder 9 to the low-pressure gas use facility 12 typified by a blast furnace, and oxygen gas is supplied from the high-pressure gas holder 7 to the high-pressure gas use facility 13 typified by a converter. The And the above-mentioned compressed oxygen is adjusted to a pressure required in each gas use equipment by these low-pressure gas holders 9 and high-pressure gas holders 7. Here, a flow rate adjusting valve 8 is attached to the inlet side of the low-pressure gas holder 9. In addition, 6 is an oxygen diffusion valve. The sequence controller 11 receives the pressure values of the low pressure gas holder 9 and the high pressure gas holder 7 measured by the pressure gauges 10a and 10b, and controls the flow rate control valve 8 and the oxygen diffusion valve 6 based on these pressure values. Done.

圧縮酸素ガス量は、常に使用設備の稼動に合わせて最適となるように制御が行われ生産されており、例えば、使用設備のいずれかが停止する際には、その状況に合わせ、精留塔の稼動基数を削減する等して、電力消費のコストがミニマムとなるように調節を行う。
ただし、精留塔は、塔内の精留板上での液と蒸気の平衡バランスを厳密に管理しながら空気の分離を行う装置であり、精留塔内の液・蒸気バランスを安定させるためには最低でも3時間程度を必要とする。そのため、使用設備側の短時間停止(例えば、30分から180 分程度)のために精留塔を一時停止したり、負荷変更を行ったりすることは実際上不可能である。
The amount of compressed oxygen gas is always controlled and produced so as to be optimal in accordance with the operation of the equipment used. For example, when any of the equipment used stops, the rectifying column is adjusted according to the situation. The power consumption cost is adjusted to a minimum by reducing the number of operating bases.
However, the rectification column is a device that separates air while strictly controlling the equilibrium balance between the liquid and vapor on the rectification plate in the column, in order to stabilize the liquid / vapor balance in the rectification column. Requires at least about 3 hours. For this reason, it is practically impossible to temporarily stop the rectification column or change the load due to a short stop (for example, about 30 to 180 minutes) on the use equipment side.

また、精留した酸素ガスを酸素圧縮機5で圧縮し、所要のガス圧として供給を行うが、精留した酸素ガスは連続的に発生するのに対し、ガス使用設備側では、転炉に代表されるように、非連続的な操業が行われるのが通常である。
そのため、工場の操業停止時や負荷変更時のバッファを確保し、安定的な供給を行うため、ガス供給ライン上にガスホルダを設けるのである。
The rectified oxygen gas is compressed by the oxygen compressor 5 and supplied at the required gas pressure, but the rectified oxygen gas is continuously generated, whereas the gas-using facility side has a converter. As represented, discontinuous operations are usually performed.
For this reason, a gas holder is provided on the gas supply line in order to secure a buffer when the operation of the factory is stopped or when the load is changed, and to perform a stable supply.

このガスホルダとしては、既に説明したように、ガス使用設備に対応して低圧ガスホルダ9と高圧ガスホルダ7の2通りのタイプを設ける。
転炉等の高圧ガス使用設備13側に設ける高圧ガスホルダ7は、例えば、上限設定値2.16MPa、下限設定値1.57MPaの高圧領域での運用が行われ、酸素圧縮機5から圧縮酸素ガスが、通常、連続的に供給され、ホルダ圧は常に高圧状態とされる。
As described above, as the gas holder, two types of the low pressure gas holder 9 and the high pressure gas holder 7 are provided corresponding to the gas use facilities.
The high-pressure gas holder 7 provided on the high-pressure gas use facility 13 side such as a converter is operated in a high-pressure region of an upper limit set value 2.16 MPa and a lower limit set value 1.57 MPa, for example, and compressed oxygen gas is supplied from the oxygen compressor 5. Usually, it is continuously supplied and the holder pressure is always in a high pressure state.

一方、高炉等の低圧ガス使用設備12側に設ける低圧ガスホルダ9には、その入口側に流量調節弁8が配置されている。そして、その運用は、ホルダ圧が下限設定値を下回るような緊急時を除いた通常状態では流量調節弁8を閉とし、低圧ガスホルダ9に貯蔵したガスを低圧ガス使用設備12側にのみ供給するようにし、圧力を常に低圧側に下げるような操業を行う。低圧ガスホルダ9は、例えば、上限設定値1.86MPa、下限設定値0.98MPaの範囲での運用が行われる。なお、ガスホルダそのものの規格は、通常、低圧ガスホルダも高圧ガスホルダも同一仕様であり、規格上の耐圧である最上限設定値は、いずれも2.35MPa程度とされる。   On the other hand, the low-pressure gas holder 9 provided on the low-pressure gas use facility 12 side such as a blast furnace is provided with a flow control valve 8 on the inlet side. And the operation is such that the flow rate control valve 8 is closed in a normal state except an emergency in which the holder pressure is lower than the lower limit set value, and the gas stored in the low pressure gas holder 9 is supplied only to the low pressure gas using facility 12 side. Thus, the operation is always performed so that the pressure is lowered to the low pressure side. For example, the low-pressure gas holder 9 is operated in the range of the upper limit set value 1.86 MPa and the lower limit set value 0.98 MPa. The standard of the gas holder itself is normally the same for both the low-pressure gas holder and the high-pressure gas holder, and the maximum upper limit set value, which is the standard pressure resistance, is about 2.35 MPa.

ここで、高圧ガスホルダ7が満杯となり、最上限設定値以上となった場合、低圧ガスホルダ9を高圧ガスホルダ7のバックアップとして用い、流量調節弁8を開として高圧ガスホルダ内の余剰ガスの回収を行う。これを放散回収とよぶ。そして、低圧ガスホルダ9と高圧ガスホルダ7のいずれもが満杯となったときには酸素放散弁6から大気放散を行う。
低圧ガスホルダ9は、高圧ガスホルダ7と比較して圧力運用幅が広いことを特徴とする。つまり、圧縮性ガスの貯蔵可能容量は(圧力幅ΔP×ガスホルダ容積V)で決まることから、最上限設定値までの圧力幅の広い低圧ガスホルダ9の方が高圧ガスホルダ7に比べ、より多量のガスを貯蔵することができる。
Here, when the high-pressure gas holder 7 is full and exceeds the maximum upper limit set value, the low-pressure gas holder 9 is used as a backup for the high-pressure gas holder 7 and the flow rate control valve 8 is opened to recover excess gas in the high-pressure gas holder. This is called diffuse recovery. When both the low-pressure gas holder 9 and the high-pressure gas holder 7 are full, the oxygen is released from the oxygen diffusion valve 6.
The low-pressure gas holder 9 is characterized in that the pressure operation width is wider than that of the high-pressure gas holder 7. That is, since the compressible gas storage capacity is determined by (pressure width ΔP × gas holder volume V), the low pressure gas holder 9 having a wide pressure range up to the upper limit set value has a larger amount of gas than the high pressure gas holder 7. Can be stored.

一貫製鉄所において従来から行われてきた酸素ガス供給方法を、図4に基づき説明する。
図4(a)は、高圧ガス使用設備である転炉、溶融還元炉、脱炭炉等での操業のトレンド、すなわち、酸素消費のトレンドを示すグラフである。図4(a)の縦軸は、それぞれの炉での酸素消費量を示す。なお、低圧ガス使用設備である高炉は、常時ほぼ一定量の酸素ガスを消費する。
The oxygen gas supply method conventionally performed in the integrated steelworks will be described with reference to FIG.
FIG. 4A is a graph showing a trend of operation in a converter, a smelting reduction furnace, a decarburization furnace or the like, which is a high-pressure gas use facility, that is, a trend of oxygen consumption. The vertical axis | shaft of Fig.4 (a) shows the oxygen consumption in each furnace. Note that a blast furnace, which is a low-pressure gas use facility, always consumes a substantially constant amount of oxygen gas.

図4(b)は、上記操業状態における高圧ガスホルダと低圧ガスホルダのホルダ圧力のトレンドを示す。ここで、ガスホルダの耐圧上限は、いずれのホルダも2.35MPaである。また、高圧ガスホルダ圧下限は1.57MPaと、低圧ガスホルダ圧下限は0.69MPaと規定される。
高圧ガスホルダ圧は、転炉等の操業に応じて大きく変動し、操業負荷が軽くなると耐圧上限にまで上昇する。ここで、高圧ガスホルダ圧が耐圧上限となると、低圧ガスホルダ入側の流量調節弁が開とされ、低圧ガスホルダへの放散回収が行われる。そして、高圧ガスホルダと低圧ガスホルダの両方が満杯となると、酸素放散弁が開とされ、大気放散が行われるのである。
FIG. 4B shows a trend of the holder pressure of the high pressure gas holder and the low pressure gas holder in the operation state. Here, the upper limit of the pressure resistance of the gas holder is 2.35 MPa for all holders. The lower limit of the high pressure gas holder pressure is 1.57 MPa, and the lower limit of the low pressure gas holder pressure is 0.69 MPa.
The high-pressure gas holder pressure varies greatly depending on the operation of the converter or the like, and rises to the upper pressure limit when the operation load is reduced. Here, when the high-pressure gas holder pressure reaches the upper limit of the pressure resistance, the flow rate control valve on the low-pressure gas holder entrance side is opened, and the diffusion recovery to the low-pressure gas holder is performed. When both the high-pressure gas holder and the low-pressure gas holder are full, the oxygen diffusion valve is opened and atmospheric diffusion is performed.

しかしながら、上記従来のガス供給方法では、図4(b)に(*)で示すように、低圧ガスホルダ圧の方が高圧ガスホルダ圧よりも高くなってしまう場合が多々発生するという問題がある。
このような状態は、活用されない余分のガスが低圧ガスホルダに貯蔵されていることであり、ガス供給ライン全体としてのガス貯蔵能力に大きな無駄が生じていることになる。
However, the conventional gas supply method has a problem that the low-pressure gas holder pressure often becomes higher than the high-pressure gas holder pressure, as indicated by (*) in FIG.
Such a state is that excess gas that is not utilized is stored in the low-pressure gas holder, and a large waste is generated in the gas storage capacity of the entire gas supply line.

本発明は、ガス貯蔵能力にこのような無駄を生じさせることなく、ガス供給ラインにおけるガス貯蔵能力の最適化を実現することを目的とする。   An object of the present invention is to realize optimization of gas storage capacity in a gas supply line without causing such waste in gas storage capacity.

本発明は、昇圧したガスを、高圧ガスホルダを介して高圧ガス使用設備に供給し、かつ、ガス入側にガスの流量を調節する流量調節弁を有する低圧ガスホルダを介して低圧ガス使用設備に供給するガス供給方法であって、前記の低圧ガスホルダの圧力と高圧ガスホルダの圧力の関係が、(低圧ガスホルダの圧力)>(高圧ガスホルダの圧力)であり、かつ、低圧ガスホルダの圧力が下限設定値以上であるときは、前記流量調節弁を開として、低圧ガスホルダのガスを高圧ガスホルダにも送給し、(低圧ガスホルダの圧力)≦(高圧ガスホルダの圧力)であり、かつ、低圧ガスホルダの圧力が下限設定値以上であり、高圧ガスホルダの圧力が上限設定値未満であるときは、前記流量調節弁を閉として、低圧ガスホルダのガスを低圧ガス使用設備にのみ送給するようにしたことを特徴とするガス供給方法によって上記課題を解決したのである。   The present invention supplies the pressurized gas to the high-pressure gas use facility via the high-pressure gas holder and to the low-pressure gas use facility via the low-pressure gas holder having a flow rate adjusting valve for adjusting the gas flow rate on the gas inlet side. A method of supplying gas, wherein the relationship between the pressure of the low-pressure gas holder and the pressure of the high-pressure gas holder is (pressure of the low-pressure gas holder)> (pressure of the high-pressure gas holder), and the pressure of the low-pressure gas holder is equal to or higher than a lower limit set value. When the flow rate control valve is opened, the gas in the low-pressure gas holder is also supplied to the high-pressure gas holder, and (pressure of the low-pressure gas holder) ≦ (pressure of the high-pressure gas holder) and the pressure of the low-pressure gas holder is the lower limit. When the pressure is higher than the set value and the pressure of the high-pressure gas holder is less than the upper-limit set value, the flow control valve is closed and the gas in the low-pressure gas holder is used as the low-pressure gas equipment. It was the above-mentioned problems are eliminated by the gas supply method is characterized in that so as to feed only.

本発明によって、従来ピーク使用時において逼迫していた高圧側のガスバランスを緩和することが可能となり、また、低圧ガスホルダ圧を下限近くまで下げての運用が可能となった。その結果、低圧ガスホルダの能力を十分に発揮させることができるようになり、圧力運用幅を広げた操業が可能となり、大気中への無用のガス放散を大幅に削減できるようになり、ひいては、酸素プラントの消費電力を大幅に削減することができるようになった。   According to the present invention, the gas balance on the high-pressure side, which has been tight during conventional peak use, can be relaxed, and the operation can be performed with the low-pressure gas holder pressure lowered to near the lower limit. As a result, the capability of the low-pressure gas holder can be fully exerted, operation with a wide pressure operating range becomes possible, and unnecessary gas emission to the atmosphere can be greatly reduced. The power consumption of the plant can be greatly reduced.

本発明を適用するのに好適なガス供給ラインの一例を示す模式図である。It is a schematic diagram which shows an example of the gas supply line suitable for applying this invention. 本発明を適用した場合の高圧ガスホルダと低圧ガスホルダのそれぞれのホルダ圧の推移を示すグラフである。It is a graph which shows transition of each holder pressure of the high-pressure gas holder at the time of applying this invention, and a low-pressure gas holder. 本発明を適用した場合の各状態におけるガス供給ラインのガスの流れを説明するための模式図である。It is a schematic diagram for demonstrating the gas flow of the gas supply line in each state at the time of applying this invention. 従来の高圧ガスホルダと低圧ガスホルダのそれぞれのホルダ圧の推移を示すグラフである。It is a graph which shows transition of each holder pressure of the conventional high-pressure gas holder and a low-pressure gas holder.

本発明のガス供給方法の好適な実施の形態を表1に基づき説明する。   A preferred embodiment of the gas supply method of the present invention will be described with reference to Table 1.

Figure 2010249318
Figure 2010249318

表1は、図1に示した一貫製鉄所における酸素ガス供給ラインにおいて適用される本発明のガス供給方法をマトリックス化して示した表である。
表の横方向には低圧ガスホルダの圧力をとり、縦方向には高圧ガスホルダの圧力をとって層別を行っている。ここで、HHは最上限設定値(ガスホルダ耐圧上限)、PHは上限設定値、PLは下限設定値を示す。表中には、それらの具体的な数値例をMPa単位で併記している。
Table 1 is a table showing the gas supply method of the present invention applied in the oxygen gas supply line in the integrated steelworks shown in FIG. 1 in a matrix form.
Layering is performed by taking the pressure of the low-pressure gas holder in the horizontal direction of the table and taking the pressure of the high-pressure gas holder in the vertical direction. Here, HH is the maximum upper limit set value (gas holder pressure upper limit), PH is the upper limit set value, and PL is the lower limit set value. In the table, specific numerical examples thereof are also shown in units of MPa.

高圧ガスホルダ圧力現在値(PV)がPH以上、つまり、2.16MPa以上の場合、流量調節弁は常に開とされ、無条件で低圧ガスホルダへの放散回収が行われる。ただし、表には示していないが、高圧ガスホルダ圧力現在値(PV)と低圧ガスホルダ圧力現在値(PV)のいずれもがHH以上、つまり、2.35MPa以上となった場合には、大気放散が行われることになる。なお、本発明には直接関係しないが、高圧ガスホルダ圧力現在値(PV)がPH以上であってもHH未満(2.35MPa未満)の場合には、ゆっくりと放散が行われ、高圧ガスホルダ圧力現在値(PV)がHH以上ではそれ以上に圧力が上がらないように一気に放散が行われる。   When the high pressure gas holder pressure current value (PV) is equal to or higher than PH, that is, equal to or higher than 2.16 MPa, the flow rate control valve is always opened, and the diffusion recovery to the low pressure gas holder is performed unconditionally. However, although not shown in the table, when both the high-pressure gas holder pressure current value (PV) and the low-pressure gas holder pressure current value (PV) are HH or higher, that is, 2.35 MPa or higher, atmospheric emissions are performed. Will be. Although not directly related to the present invention, even if the high pressure gas holder pressure current value (PV) is greater than or equal to PH, if it is less than HH (less than 2.35 MPa), it is slowly dissipated and the high pressure gas holder pressure current value. When (PV) is higher than HH, the emission is performed at once so that the pressure does not increase further.

次に、高圧ガスホルダ圧力現在値(PV)がPH未満PL以上の場合は、低圧ガスホルダ圧と高圧ガスホルダ圧の大小比較を行い、(低圧ガスホルダ圧)>(高圧ガスホルダ圧)の場合には、流量調節弁を開として低圧ガスホルダから高圧ガスホルダと低圧ガス使用設備の両方にガスの送給を行うようにする。なお、表には示していないが、低圧ガスホルダ圧がHH以上の場合も流量調整弁を開とする。一方、(低圧ガスホルダ圧)≦(高圧ガスホルダ圧)の場合は、流量調節弁を閉として低圧ガスホルダからは低圧ガス使用設備のみにガスの送給を行うようにする。ただし、低圧ガスホルダ圧がPL未満、すなわち、0.69MPa未満の場合には、流量調節弁を開とし、緊急バックアップとして低圧ガスホルダへの酸素ガスの導入、貯蔵を行う。   Next, if the high pressure gas holder pressure current value (PV) is less than PH and greater than PL, the low pressure gas holder pressure is compared with the high pressure gas holder pressure. If (low pressure gas holder pressure)> (high pressure gas holder pressure), the flow rate The control valve is opened to supply gas from the low pressure gas holder to both the high pressure gas holder and the low pressure gas using facility. Although not shown in the table, the flow rate adjustment valve is also opened when the low-pressure gas holder pressure is HH or higher. On the other hand, in the case of (low pressure gas holder pressure) ≦ (high pressure gas holder pressure), the flow rate adjustment valve is closed and gas is supplied from the low pressure gas holder only to the low pressure gas using equipment. However, when the low-pressure gas holder pressure is less than PL, that is, less than 0.69 MPa, the flow rate control valve is opened, and oxygen gas is introduced into and stored in the low-pressure gas holder as an emergency backup.

高圧ガスホルダ圧力現在値(PV)がPL未満の場合は、酸素圧縮機からの圧縮酸素を供給するとともに、低圧ガスホルダ圧と高圧ガスホルダ圧の大小の比較を行い、(低圧ガスホルダ圧)>(高圧ガスホルダ圧)の場合には、流量調節弁を開として、低圧ガスホルダから高圧ガスホルダと低圧ガス使用設備の両方にガスの供給を行うようにする。なお、表には示していないが、低圧ガスホルダ圧がHH以上の場合も流量調整弁を開とする。一方、(低圧ガスホルダ圧)≦(高圧ガスホルダ圧)の場合は、流量調節弁を閉として低圧ガスホルダからは低圧ガス使用設備のみにガスの送給を行うようにする。ただし、低圧ガスホルダ圧がPL未満、すなわち、0.69MPa未満の場合には、流量調節弁を開とし、緊急バックアップとして低圧ガスホルダへの酸素ガスの導入、貯蔵を行う。   If the high pressure gas holder pressure current value (PV) is less than PL, supply compressed oxygen from the oxygen compressor and compare the low pressure gas holder pressure with the high pressure gas holder pressure. (Low pressure gas holder pressure)> (High pressure gas holder) In the case of pressure), the flow rate control valve is opened, and gas is supplied from the low pressure gas holder to both the high pressure gas holder and the low pressure gas using equipment. Although not shown in the table, the flow rate adjustment valve is also opened when the low-pressure gas holder pressure is HH or higher. On the other hand, in the case of (low pressure gas holder pressure) ≦ (high pressure gas holder pressure), the flow rate adjustment valve is closed and gas is supplied from the low pressure gas holder only to the low pressure gas using equipment. However, when the low-pressure gas holder pressure is less than PL, that is, less than 0.69 MPa, the flow rate control valve is opened, and oxygen gas is introduced into and stored in the low-pressure gas holder as an emergency backup.

すなわち、本発明のガス供給方法では、低圧ガスホルダの圧力がその下限設定値未満のときは、ガスの流量調節弁を開として低圧ガスホルダへのガスの充填を行い、低圧ガスホルダの圧力(低圧ガスホルダ圧)と高圧ガスホルダの圧力(高圧ガスホルダ圧)の関係が、
(低圧ガスホルダ圧)>(高圧ガスホルダ圧)であり、かつ、低圧ガスホルダの圧力が下限設定値以上であるとき、流量調節弁を開とし、低圧ガスホルダのガスを高圧ガスホルダにも供給するようにし、高圧ガスホルダと低圧ガス使用設備の両方にガスを送給し、
(低圧ガスホルダ圧)≦(高圧ガスホルダ圧)であり、かつ、低圧ガスホルダ圧が下限設定値以上であるときは、流量調節弁を閉とし、ガスを低圧ガス使用設備にのみ送給するようにしたことを特徴とする。
That is, in the gas supply method of the present invention, when the pressure of the low pressure gas holder is less than the lower limit set value, the gas flow rate adjustment valve is opened to fill the low pressure gas holder with gas, and the pressure of the low pressure gas holder (low pressure gas holder pressure ) And the pressure of the high-pressure gas holder (high-pressure gas holder pressure)
When (low pressure gas holder pressure)> (high pressure gas holder pressure) and the pressure of the low pressure gas holder is equal to or higher than the lower limit set value, the flow control valve is opened, and the gas of the low pressure gas holder is also supplied to the high pressure gas holder, Deliver gas to both the high pressure gas holder and the low pressure gas equipment,
When (low pressure gas holder pressure) ≤ (high pressure gas holder pressure) and the low pressure gas holder pressure is equal to or higher than the lower limit set value, the flow control valve is closed and the gas is supplied only to the equipment using low pressure gas. It is characterized by that.

図1に示す一貫製鉄所における酸素供給ラインに、本発明のガス供給方法を適用した。なお、図中には表示していないが、酸素圧縮機の出口近傍に逆止弁を設けている。
すなわち、低圧ガスホルダの圧力がその下限設定値未満のときは、ガスの流量調節弁を開としてガスの充填を行い、
低圧ガスホルダの圧力(低圧ガスホルダ圧)と高圧ガスホルダの圧力(高圧ガスホルダ圧)の関係が、(低圧ガスホルダ圧)>(高圧ガスホルダ圧)であり、かつ、低圧ガスホルダ圧が下限設定値以上であるとき、流量調節弁を開とし、低圧ガスホルダのガスを高圧ガスホルダにも供給するようにし、高圧ガスホルダと低圧ガス使用設備の両方にガスを送給し、
(低圧ガスホルダ圧)≦(高圧ガスホルダ圧)であり、かつ、低圧ガスホルダ圧が下限設定値以上であり、高圧ガスホルダの圧力が上限設定値未満であるときは、流量調節弁を閉とし、ガスを低圧ガス使用設備にのみ送給するようにした。
The gas supply method of the present invention was applied to the oxygen supply line in the integrated steelworks shown in FIG. Although not shown in the figure, a check valve is provided in the vicinity of the outlet of the oxygen compressor.
That is, when the pressure of the low-pressure gas holder is less than the lower limit set value, the gas flow control valve is opened and gas is filled,
When the relationship between the pressure of the low-pressure gas holder (low-pressure gas holder pressure) and the pressure of the high-pressure gas holder (high-pressure gas holder pressure) is (low-pressure gas holder pressure)> (high-pressure gas holder pressure) and the low-pressure gas holder pressure is greater than or equal to the lower limit setting value The flow control valve is opened, the gas in the low-pressure gas holder is also supplied to the high-pressure gas holder, the gas is sent to both the high-pressure gas holder and the low-pressure gas using equipment,
When (low pressure gas holder pressure) ≤ (high pressure gas holder pressure), the low pressure gas holder pressure is equal to or higher than the lower limit set value, and the pressure of the high pressure gas holder is lower than the upper limit set value, the flow control valve is closed and the gas is It was made to send only to the equipment using low pressure gas.

なお、その際の高圧ガスホルダ圧と低圧ガスホルダ圧のトレンド例を図2に示す。図2は、従来のガス供給方法としてすでに説明した図4に対応して記載している。
図2から明らかなように、本発明によって、従来では問題となっていた低圧ガスホルダ圧の方が高圧ガスホルダ圧よりも高くなってしまう現象がほぼ解消されていることがわかる。
FIG. 2 shows a trend example of the high pressure gas holder pressure and the low pressure gas holder pressure at that time. FIG. 2 is described corresponding to FIG. 4 which has already been described as a conventional gas supply method.
As apparent from FIG. 2, it can be seen that the present invention substantially eliminates the phenomenon that the low-pressure gas holder pressure, which has been a problem in the past, becomes higher than the high-pressure gas holder pressure.

次に、図3に基づき、酸素ガス供給ラインにおける幾つかの具体的な供給状態の例を挙げ、酸素ガス供給をどのように行っているかを説明する。
図3は、図2(b)で示すトレンドにおいてa、b、cの矢印で示す各時点での酸素ガス供給状態を説明する模式図である。このa、b、cは、図3における(a)、(b)、(c)に対応させている。
Next, with reference to FIG. 3, examples of some specific supply states in the oxygen gas supply line will be given and how oxygen gas is supplied will be described.
FIG. 3 is a schematic diagram for explaining the oxygen gas supply state at each time point indicated by arrows a, b, and c in the trend shown in FIG. These a, b, and c correspond to (a), (b), and (c) in FIG.

図3(a)のピーク吹錬中では、流量調節弁8が開とされ、高圧ガス使用設備(転炉、溶融還元炉、脱炭炉)13での酸素ガス不足分を低圧ガスホルダ9から払い出すようにする。
図3(b)のピーク吹錬終了後では、流量調節弁8を閉とし、高圧ガスホルダ7のみに酸素ガスを供給する。
During peak blowing in FIG. 3 (a), the flow control valve 8 is opened, and the oxygen gas shortage in the high pressure gas use equipment (converter, smelting reduction furnace, decarburization furnace) 13 is paid from the low pressure gas holder 9. Try to put out.
After the peak blowing in FIG. 3B, the flow rate control valve 8 is closed and oxygen gas is supplied only to the high-pressure gas holder 7.

また、図3(c)の吹錬の切れ間では、高圧ガスホルダ7の圧力が上限となった時点で流量調節弁8を開とし、低圧ガスホルダ9に酸素ガスの放散回収を行うようにする。
一方、従来例のガス供給方法については、従来の技術として図4に基づいて説明したとおりである。
本発明例においては、従来例よりも酸素ガスを大気放散した割合が約2.5 %削減することができた。そして、その結果、本発明例では酸素プラントの消費電力を従来例から約795KWH/Hr削減することができた。
In addition, during the blow-off period shown in FIG. 3C, the flow rate control valve 8 is opened when the pressure of the high-pressure gas holder 7 reaches the upper limit, and the low-pressure gas holder 9 performs the diffusion recovery of oxygen gas.
On the other hand, the conventional gas supply method is the same as the conventional technique described with reference to FIG.
In the example of the present invention, the proportion of oxygen gas released to the atmosphere was reduced by about 2.5% compared to the conventional example. As a result, in the present invention example, the power consumption of the oxygen plant could be reduced by about 795 KWH / Hr from the conventional example.

なお、高圧ガスホルダには、高圧ガス使用設備のみを接続した例を示したが、低圧ガス使用設備も接続されていてもよい。
また、低圧ガスホルダには、複数の低圧ガス使用設備が接続されていてもよい。
In addition, although the example which connected only the high pressure gas use installation to the high pressure gas holder was shown, the low pressure gas use installation may be connected.
A plurality of low-pressure gas use facilities may be connected to the low-pressure gas holder.

本発明によれば、低圧ガスホルダの能力を十分に発揮させることができるようになり、圧力運用幅を広げた操業が可能となり、大気中への無用のガス放散を大幅に削減できるようになり、ひいては、酸素プラントの消費電力を大幅に削減することができるという多大な効果が得られる。   According to the present invention, the capability of the low-pressure gas holder can be fully exerted, operation with a wide pressure operating range becomes possible, and unnecessary gas emission to the atmosphere can be greatly reduced, As a result, the great effect that the power consumption of an oxygen plant can be reduced significantly is acquired.

1 空気圧縮機
2 水洗冷却塔
3 モリキュラシーブス吸着器
4 コールドボックス(精留塔、主熱交換器等)
5 酸素圧縮機
6 酸素放散弁
7 高圧ガスホルダ
8 流量調節弁
9 低圧ガスホルダ
10a 、10b 圧力計
11 シーケンス制御装置
12 高炉(低圧ガス使用設備)
13 転炉(高圧ガス使用設備)
DESCRIPTION OF SYMBOLS 1 Air compressor 2 Flushing cooling tower 3 Molecule sieve adsorber 4 Cold box (rectification tower, main heat exchanger, etc.)
5 Oxygen compressor 6 Oxygen diffusion valve 7 High-pressure gas holder 8 Flow control valve 9 Low-pressure gas holder
10a, 10b pressure gauge
11 Sequence controller
12 Blast furnace (low pressure gas equipment)
13 Converter (equipment using high-pressure gas)

Claims (1)

昇圧したガスを、高圧ガスホルダを介して高圧ガス使用設備に供給し、かつ、ガス入側にガスの流量を調節する流量調節弁を有する低圧ガスホルダを介して低圧ガス使用設備に供給するガス供給方法であって、
前記の低圧ガスホルダの圧力と高圧ガスホルダの圧力の関係が、
(低圧ガスホルダの圧力)>(高圧ガスホルダの圧力)であり、かつ、低圧ガスホルダの圧力が下限設定値以上であるときは、前記流量調節弁を開として、低圧ガスホルダのガスを高圧ガスホルダにも送給し、
(低圧ガスホルダの圧力)≦(高圧ガスホルダの圧力)であり、かつ、低圧ガスホルダの圧力が下限設定値以上であり、高圧ガスホルダの圧力が上限設定値未満であるときは、前記流量調節弁を閉として、低圧ガスホルダのガスを低圧ガス使用設備にのみ送給するようにしたことを特徴とするガス供給方法。
A gas supply method for supplying a pressurized gas to a high-pressure gas use facility via a high-pressure gas holder and to a low-pressure gas use facility via a low-pressure gas holder having a flow rate adjusting valve for adjusting the gas flow rate on the gas inlet side Because
The relationship between the pressure of the low pressure gas holder and the pressure of the high pressure gas holder is as follows:
When the pressure of the low pressure gas holder is greater than the pressure of the high pressure gas holder and the pressure of the low pressure gas holder is equal to or higher than the lower limit set value, the flow rate control valve is opened and the gas of the low pressure gas holder is also sent to the high pressure gas holder. And
When the pressure of the low pressure gas holder is equal to or less than the pressure of the high pressure gas holder, the pressure of the low pressure gas holder is equal to or higher than the lower limit set value, and the pressure of the high pressure gas holder is lower than the upper limit set value, the flow rate control valve is closed. As a gas supply method, the gas in the low-pressure gas holder is fed only to the low-pressure gas use facility.
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