JPH06117752A - Method and device for liquefaction and separation of air - Google Patents
Method and device for liquefaction and separation of airInfo
- Publication number
- JPH06117752A JPH06117752A JP26380892A JP26380892A JPH06117752A JP H06117752 A JPH06117752 A JP H06117752A JP 26380892 A JP26380892 A JP 26380892A JP 26380892 A JP26380892 A JP 26380892A JP H06117752 A JPH06117752 A JP H06117752A
- Authority
- JP
- Japan
- Prior art keywords
- gas
- liquefied
- nitrogen
- liquefied nitrogen
- purity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04763—Start-up or control of the process; Details of the apparatus used
- F25J3/04866—Construction and layout of air fractionation equipments, e.g. valves, machines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
- F25J3/04078—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression
- F25J3/04084—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression of nitrogen
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
- F25J3/04078—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression
- F25J3/04103—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression using solely hydrostatic liquid head
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04248—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion
- F25J3/04284—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams
- F25J3/04309—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using internal refrigeration by open-loop gas work expansion, e.g. of intermediate or oxygen enriched (waste-)streams of nitrogen
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04406—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system
- F25J3/04412—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system in a classical double column flowsheet, i.e. with thermal coupling by a main reboiler-condenser in the bottom of low pressure respectively top of high pressure column
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2235/00—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams
- F25J2235/42—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams the fluid being nitrogen
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2245/00—Processes or apparatus involving steps for recycling of process streams
- F25J2245/42—Processes or apparatus involving steps for recycling of process streams the recycled stream being nitrogen
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、空気液化分離方法及び
装置に関し、詳しくは、得られた液化ガスを昇圧して送
出あるいは循環させる系統を備えた空気液化分離装置に
おける各種ガスの液化ガスポンプやガス圧縮機等の回転
機に用いるシールガスの採取方法及びその装置構成に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air liquefaction separation method and apparatus, and more particularly, to a liquefied gas pump for various gases in an air liquefaction separation apparatus equipped with a system for boosting the pressure of the obtained liquefaction gas and sending or circulating it. The present invention relates to a method for collecting a seal gas used in a rotating machine such as a gas compressor and a device configuration thereof.
【０００２】[0002]
【従来の技術】空気液化分離装置の付帯設備として設け
られている液化ガスポンプには、通常、１ｋｇ／ｃｍ2
Ｇ以上の圧力を有するシールガスが用いられている。従
来の装置では、このシールガスを、約５ｋｇ／ｃｍ2 Ｇ
で運転されている複精留塔の下部塔から窒素ガスを抜き
出すことにより得ていた。2. Description of the Related Art A liquefied gas pump provided as an auxiliary equipment of an air liquefaction separation device usually has a pressure of 1 kg / cm 2
A seal gas having a pressure of G or higher is used. In the conventional device, this sealing gas is used at about 5 kg / cm 2 G
It was obtained by withdrawing nitrogen gas from the lower column of the double rectification column operated at.
【０００３】一方、近年の各種ガスの高純度化の要求に
応えるため、空気液化分離装置においても様々な工夫が
成されている。例えば、超高純度窒素を製造する装置に
おいて、低沸点成分を製品窒素から分離するため、複精
留塔の下部塔頂部から低沸点成分を多量に含む窒素ガス
を導出し、下部塔頂部の数段下から製品及び上部塔還流
液となる液化窒素を導出することにより、低沸点成分含
有量の極めて少ない製品高純度液化窒素を得るととも
に、上部塔への低沸点成分の導入を防止し、上部塔頂部
から低沸点成分含有量の極めて少ない製品製品窒素ガス
を得ることが行われている。On the other hand, various contrivances have been made also in the air liquefaction / separation device in order to meet the recent demand for high purity of various gases. For example, in an apparatus for producing ultra-high-purity nitrogen, in order to separate low-boiling components from product nitrogen, nitrogen gas containing a large amount of low-boiling components is discharged from the lower tower top of the double rectification column, and the number of lower tower tops By liquefying the product and the liquefied nitrogen to be the reflux liquid of the upper tower from the lower part, the product high-purity liquefied nitrogen with an extremely low content of low-boiling components can be obtained, and the introduction of the low-boiling components into the upper tower can be prevented. It is practiced to obtain product product nitrogen gas having a very low content of low boiling point components from the top of the column.
【０００４】[0004]
【発明が解決しようとする課題】上記のような構成の空
気液化分離装置において、上記製品高純度液化窒素を送
出する液化ガスポンプのシールガスに、従来のように下
部塔から導出した窒素ガスを用いると、該窒素ガスに含
まれている低沸点成分が製品高純度液化窒素中に混入
し、製品の純度を損なうおそれがあった。また、他の構
成の装置においても、シールガス中の不純物が製品内に
混入して製品純度を低下させる原因となっている。In the air liquefaction / separation device having the above-mentioned structure, the nitrogen gas derived from the lower column as in the conventional case is used as the seal gas for the liquefied gas pump for delivering the product high-purity liquefied nitrogen. Then, the low-boiling point component contained in the nitrogen gas may be mixed in the high-purity liquefied nitrogen product to impair the purity of the product. Further, also in the devices having other configurations, impurities in the seal gas are mixed in the product, which causes a decrease in product purity.
【０００５】そこで本発明は、製品液化ガス、特に製品
高純度液化窒素用に用いられる液化ガスポンプのシール
ガスとして適したガスを得ることができる空気液化分離
方法及び装置を提供することを目的としている。Therefore, an object of the present invention is to provide an air liquefaction separation method and apparatus capable of obtaining a product liquefied gas, particularly a gas suitable as a seal gas for a liquefied gas pump used for product high-purity liquefied nitrogen. .
【０００６】[0006]
【課題を解決するための手段】上記した目的を達成する
ため、本発明の空気液化分離方法は、複精留塔の上部塔
から液化ガスを導出し、寒冷を回収して気化した後に、
空気液化分離装置に付設された回転機、例えば液化ガス
ポンプのシールガスとして用いることを特徴としてい
る。In order to achieve the above-mentioned object, the air liquefaction separation method of the present invention, the liquefied gas is derived from the upper column of the double rectification column, and after refrigeration is recovered and vaporized,
It is characterized by being used as a seal gas for a rotary machine attached to an air liquefaction separation device, for example, a liquefied gas pump.
【０００７】また、本発明の空気液化分離装置は、複精
留塔の上部塔に液化ガス導出管を設けるとともに、該液
化ガス導出管と空気液化分離装置に付設された回転機、
例えば液化ガスポンプのガスシール部とを、導出された
液化ガスを気化する熱交換器を介して接続したことを特
徴としている。The air liquefaction / separation device of the present invention is provided with a liquefied gas outlet pipe in the upper column of the double rectification column, and a rotary machine attached to the liquefied gas outlet pipe and the air liquefaction separator.
For example, it is characterized in that the gas seal portion of the liquefied gas pump is connected via a heat exchanger that vaporizes the liquefied gas that has been drawn out.
【０００８】[0008]
【作 用】上記のように、複精留塔の上部塔から導出さ
れた液化ガスは、低沸点成分をほとんど含まないため、
これを気化して、例えば高純度液化ガスを圧送する液化
ガスポンプのシールガスとして用いることにより、該シ
ールガスから不純物が液化ガスに混入することがなく、
液化ガスの純度低下を防止できる。また、シールガスと
して必要な圧力は、液化ガス導出部の高さによる液ヘッ
ドにより得ることができる。[Operation] As mentioned above, the liquefied gas discharged from the upper column of the double rectification column contains almost no low-boiling point component.
By vaporizing this and using it as a seal gas for a liquefied gas pump that pumps, for example, a high-purity liquefied gas, impurities are not mixed into the liquefied gas from the seal gas,
It is possible to prevent the purity of the liquefied gas from decreasing. Further, the pressure required as the seal gas can be obtained by the liquid head depending on the height of the liquefied gas outlet.
【０００９】[0009]
【実施例】以下、本発明を、図面に示す一実施例に基づ
いてさらに詳細に説明する。図示しない圧縮機及び前処
理設備で圧縮，精製された原料空気は、管１から主熱交
換器２に導入され、各種帰還ガスと熱交換して冷却され
た後、管３から複精留塔４の下部塔５の下部に導入され
る。該下部塔５内での精留操作により、原料空気は、下
部塔上部の窒素ガスと、下部塔底部の酸素富化液化空気
とに分離し、該液化空気は、下部塔底部から管６に導出
されて過冷器７，膨張弁８を経て上部塔９の中段上部に
導入され、上部塔９内での精留操作により上部塔上部の
窒素ガスと上部塔底部の液化酸素とに分離する。BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in more detail based on an embodiment shown in the drawings. Raw material air compressed and purified by a compressor and a pretreatment facility (not shown) is introduced into a main heat exchanger 2 from a pipe 1, cooled by exchanging heat with various return gases, and then from a pipe 3 to a double rectification column. 4 is introduced into the lower part of the lower tower 5. By the rectification operation in the lower tower 5, the raw material air is separated into the nitrogen gas in the upper part of the lower tower and the oxygen-enriched liquefied air in the lower part of the lower tower, and the liquefied air is introduced into the pipe 6 from the lower part of the lower tower. It is led out and introduced into the upper middle part of the upper tower 9 through the supercooler 7 and the expansion valve 8 and is separated into nitrogen gas in the upper tower upper part and liquefied oxygen in the upper tower bottom by a rectification operation in the upper tower 9. .
【００１０】一方、下部塔５の頂部からは、低沸点成分
を含む窒素ガスが管１０に導出されている。この窒素ガ
スの一部は、管１１により主熱交換器２に導入され、中
間温度まで昇温した後、膨張タービン１２に導入され、
膨張して寒冷を発生し、再び主熱交換器２を通って管１
３から外部に導出される。また、前記管１０の窒素ガス
の残部は、管１４から主凝縮蒸発器１５に導入され、液
化酸素と熱交換を行い、液化して管１６に導出され、下
部塔頂部に還流液として導入される。On the other hand, nitrogen gas containing a low boiling point component is led out to the pipe 10 from the top of the lower tower 5. A part of this nitrogen gas is introduced into the main heat exchanger 2 through the pipe 11, heated to an intermediate temperature, and then introduced into the expansion turbine 12,
It expands to generate cold, and again passes through the main heat exchanger 2 and the pipe 1
3 is derived to the outside. The rest of the nitrogen gas in the pipe 10 is introduced into the main condenser evaporator 15 from the pipe 14, exchanges heat with liquefied oxygen, is liquefied and is led out to the pipe 16, and is introduced as a reflux liquid at the top of the lower column. It
【００１１】さらに、下部塔５の頂部から数段下の精留
段からは、低沸点成分をほとんど含まない高純度液化窒
素が管１７に導出されている。この高純度液化窒素は、
過冷器７を経た後に一部が管１８に分岐して製品液化窒
素貯槽ＴＮに製品高純度液化窒素ＰＬＮとして導出さ
れ、残部が管１９の膨張弁２０を介して上部塔頂部に還
流液として導入される。Further, high-purity liquefied nitrogen containing almost no low-boiling point components is led to a pipe 17 from a rectification stage several stages below the top of the lower column 5. This high-purity liquefied nitrogen is
After passing through the subcooler 7, a part of the product branches into a pipe 18 and is discharged to the product liquefied nitrogen storage tank TN as product high-purity liquefied nitrogen PLN, and the rest is refluxed to the top of the upper column through an expansion valve 20 of the pipe 19. be introduced.
【００１２】前記上部塔９の頂部からは、管２１に窒素
ガスが導出され、過冷器７，主熱交換器２を経て前記管
１３に合流して外部に導出されている。また、上部塔９
の下部からは、管２２に酸素ガスが導出され、主熱交換
器２を経て管２３から製品酸素ガスＧＯとして外部に導
出されるとともに、管２４に液化酸素が導出され、液化
酸素ポンプ２５，過冷器７を経て製品液化酸素ＬＯとし
て管２６から製品液化酸素貯槽ＴＯに取り出されてい
る。From the top of the upper tower 9, nitrogen gas is led out to a pipe 21, is passed through the subcooler 7 and the main heat exchanger 2, merges with the pipe 13, and is led out to the outside. Also, the upper tower 9
Oxygen gas is discharged to the pipe 22 from the lower part of the pipe, is discharged to the outside as the product oxygen gas GO from the pipe 23 via the main heat exchanger 2, and liquefied oxygen is discharged to the pipe 24 to liquefy the oxygen pump 25, The product liquefied oxygen LO is taken out from the pipe 26 into the product liquefied oxygen storage tank TO through the subcooler 7.
【００１３】そして、上部塔９の上部精留段には、液化
窒素導出管２７が設けられおり、該部分の液化窒素を導
出している。この液化窒素導出管２７に導出された液化
窒素は、主熱交換器２で寒冷回収されるとともに気化し
て窒素ガスとなり、管２８から、前記製品高純度液化窒
素ＰＬＮを昇圧する液化窒素チャージポンプ２９のシー
ル部にシールガスとして導入される。A liquefied nitrogen outlet pipe 27 is provided in the upper rectification stage of the upper tower 9 to lead out the liquefied nitrogen from the portion. The liquefied nitrogen discharged to the liquefied nitrogen discharge pipe 27 is cooled and recovered in the main heat exchanger 2 and vaporized into nitrogen gas, and the liquefied nitrogen charge pump for boosting the product high-purity liquefied nitrogen PLN from the pipe 28. It is introduced as a seal gas into the seal portion 29.
【００１４】上記上部塔９から導出された液化窒素は、
下部塔５から還流液として導入された低沸点成分を含ま
ない液化窒素からなるものであるから、これを気化して
高純度液化窒素用の液化窒素チャージポンプ２９のシー
ルガスとして用いることにより、昇圧する高純度液化窒
素中に不純物となる低沸点成分が混入することを防止で
き、該高純度液化窒素の純度低下を生じることがない、
また、液化窒素チャージポンプ２９のシールガスとして
必要な約１〜２ｋｇ／ｃｍ2 Ｇの圧力は、上部塔９の液
化窒素導出位置と主熱交換器２との高さの差、通常は、
１０〜３０ｍの高さに応じた液ヘッドにより得ることが
できる。The liquefied nitrogen discharged from the upper tower 9 is
Since it consists of liquefied nitrogen containing no low-boiling point component introduced as a reflux liquid from the lower tower 5, it is vaporized and used as a seal gas for the liquefied nitrogen charge pump 29 for high-purity liquefied nitrogen. It is possible to prevent a low boiling point component that becomes an impurity from being mixed in the high-purity liquefied nitrogen, and the purity of the high-purity liquefied nitrogen does not decrease.
The pressure of about 1 to 2 kg / cm 2 G required as a seal gas for the liquefied nitrogen charge pump 29 is the difference in height between the liquefied nitrogen outlet position of the upper tower 9 and the main heat exchanger 2, usually,
It can be obtained by a liquid head depending on the height of 10 to 30 m.
【００１５】さらに、製品液化酸素を送出する液化酸素
ポンプ２５や液化酸素チャージポンプ３０のシールガス
として、上部塔底部から導出した液化酸素を気化して用
いることにより、製品液化酸素中への不純物の混入も防
止できる。この場合も、前記上部塔底部から、通常の液
化酸素ポンプ２５及び液化酸素チャージポンプ３０の設
置されている地上までは、１０ｍ以上あるので、この分
の液ヘッドにより約１ｋｇ／ｃｍ2 Ｇを上回る圧力が得
られる。Further, as the sealing gas for the liquefied oxygen pump 25 and the liquefied oxygen charge pump 30 for delivering the liquefied oxygen of the product, the liquefied oxygen derived from the bottom of the upper tower is vaporized and used to remove impurities in the liquefied oxygen of the product. Mixing can also be prevented. Also in this case, since the distance from the bottom of the upper tower to the ground where the normal liquefied oxygen pump 25 and the liquefied oxygen charge pump 30 are installed is 10 m or more, the liquid head for this amount exceeds about 1 kg / cm 2 G. Pressure is obtained.
【００１６】なお、上記実施例に示す空気液化分離装置
は、高純度液化窒素と酸素ガス及び液化酸素を製品とし
て採取する構成のものであるが、本発明は、上記実施例
装置に限らず、採取する製品の種類や量に応じた各種構
成の空気液化分離装置に適用することが可能である。ま
た、上部塔から導出した液化ガスを気化する手段は、前
記主熱交換器に限らず、他の熱交換器や蒸発器を用いた
り、これらを組み合わせてもよい。The air liquefaction / separation device shown in the above-mentioned embodiment has a structure for collecting high-purity liquefied nitrogen, oxygen gas, and liquefied oxygen as products, but the present invention is not limited to the above-mentioned device. It can be applied to air liquefaction / separation devices of various configurations according to the type and amount of products to be collected. The means for vaporizing the liquefied gas discharged from the upper tower is not limited to the main heat exchanger, but other heat exchangers or evaporators may be used, or a combination of these may be used.
【００１７】さらに、本発明により得たシールガスは、
それぞれのガスの種類に応じて空気液化分離装置に付設
する各種圧縮機、即ち窒素圧縮機，酸素圧縮機のシール
ガスとして使用することができる。また、前記軸受部の
シールガスとしての使用以外に、液化ガスチャージポン
プの着霜防止用ボックス内のシールガスとしても喪散る
ことができる。この場合は、シールガスの純度は問題に
ならないので、該チャージポンプで扱う液化ガスと異な
る種類のシールガスを用いてもよい。Further, the seal gas obtained by the present invention is
It can be used as a seal gas for various compressors attached to an air liquefaction separation device, that is, a nitrogen compressor and an oxygen compressor, depending on the type of each gas. Besides being used as the seal gas of the bearing portion, it can be consumed as the seal gas in the frost-prevention box of the liquefied gas charge pump. In this case, since the purity of the seal gas does not matter, a seal gas of a type different from the liquefied gas handled by the charge pump may be used.
【００１８】加えて、本発明におけるシールガスは、液
化サイクルを利用したガス液化装置において、近年、こ
の液化装置を頻繁に発停する装置が製造されてきている
が、この場合のガス液化装置停止時の装置内各部（配管
等）のシール用としても使用することができる。In addition, the seal gas in the present invention is a gas liquefaction apparatus utilizing a liquefaction cycle. In recent years, an apparatus for frequently starting and stopping the liquefaction apparatus has been manufactured. In this case, the gas liquefaction apparatus is stopped. It can also be used for sealing various parts (such as pipes) in the device at the time.
【００１９】[0019]
【発明の効果】以上説明したように、本発明の空気液化
分離方法及び装置は、空気液化分離装置の付帯設備とし
て設置されている各種ガスの液化ガスポンプやガス圧縮
機のシールガスに、複精留塔の上部塔から導出した液化
ガスを気化して用いるようにしたので、例えば超高純度
液化窒素を昇圧する液化ガスポンプのシールガスに上部
塔上部から導出した液化窒素を気化して用いることによ
り、シールガスから超高純度液化窒素中に不純物成分が
混入することがなく、製品の純度低下を防止することが
できる。As described above, the method and apparatus for air liquefaction separation of the present invention can be applied to the liquefied gas pump of various gases installed as an auxiliary equipment of the air liquefaction separation apparatus or the seal gas of the gas compressor to produce a fine composite gas. Since the liquefied gas derived from the upper column of the distillation column was vaporized and used, for example, by using the liquefied nitrogen derived from the upper column as the seal gas of the liquefied gas pump to pressurize ultra-high purity liquefied nitrogen by vaporizing it. As a result, no impurity component is mixed into the ultra-high-purity liquefied nitrogen from the seal gas, and the purity of the product can be prevented from decreasing.
【図１】 本発明の一実施例を示す空気液化分離装置の
系統図である。FIG. 1 is a system diagram of an air liquefaction separation apparatus showing an embodiment of the present invention.
２…主熱交換器 ４…複精留塔 ５…下部塔 ９
…上部塔 １５…主凝縮蒸発器 ２７…液化窒素導
出管 ２９…液化窒素チャージポンプ2 ... Main heat exchanger 4 ... Double rectification tower 5 ... Lower tower 9
… Upper tower 15… Main condensing evaporator 27… Liquefied nitrogen outlet pipe 29… Liquefied nitrogen charge pump
Claims (2)
塔に導入して液化精留分離を行う空気液化分離方法にお
いて、前記複精留塔の上部塔から液化ガスを導出し、寒
冷を回収して気化した後に、空気液化分離装置に付設さ
れた回転機のシールガスとして用いることを特徴とする
空気液化分離方法。1. An air liquefaction separation method in which compressed, purified, and cooled raw material air is introduced into a double rectification column to perform liquefaction rectification separation, in which a liquefied gas is derived from an upper column of the double rectification column and cooled. Is collected and vaporized, and then used as a seal gas for a rotary machine attached to an air liquefaction separation device.
留分離する複精留塔を備えた空気液化分離装置におい
て、前記複精留塔の上部塔に液化ガス導出管を設け、導
出された液化ガスを気化する熱交換器を介して空気液化
分離装置に付設された回転機のガスシール部に接続した
ことを特徴とする空気液化分離装置。2. An air liquefaction separation apparatus equipped with a double rectification column for liquefaction rectifying and separating the compressed, purified and cooled raw material air, wherein a liquefied gas outlet pipe is provided in the upper column of said double rectification column and is discharged. An air liquefaction separation device, characterized in that it is connected to a gas seal part of a rotary machine attached to the air liquefaction separation device via a heat exchanger for vaporizing the liquefied gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26380892A JPH06117752A (en) | 1992-10-01 | 1992-10-01 | Method and device for liquefaction and separation of air |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26380892A JPH06117752A (en) | 1992-10-01 | 1992-10-01 | Method and device for liquefaction and separation of air |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06117752A true JPH06117752A (en) | 1994-04-28 |
Family
ID=17394531
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26380892A Pending JPH06117752A (en) | 1992-10-01 | 1992-10-01 | Method and device for liquefaction and separation of air |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06117752A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112325567A (en) * | 2020-11-05 | 2021-02-05 | 常德天盛电化有限公司 | Liquid nitrogen preparation system |
-
1992
- 1992-10-01 JP JP26380892A patent/JPH06117752A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112325567A (en) * | 2020-11-05 | 2021-02-05 | 常德天盛电化有限公司 | Liquid nitrogen preparation system |
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