JPH05172459A - Pretreation of raw material air in air separating process - Google Patents
Pretreation of raw material air in air separating processInfo
- Publication number
- JPH05172459A JPH05172459A JP3343356A JP34335691A JPH05172459A JP H05172459 A JPH05172459 A JP H05172459A JP 3343356 A JP3343356 A JP 3343356A JP 34335691 A JP34335691 A JP 34335691A JP H05172459 A JPH05172459 A JP H05172459A
- Authority
- JP
- Japan
- Prior art keywords
- tower
- cooling
- air
- nitrogen gas
- adsorption
- 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.)
- Granted
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
- F25J3/04151—Purification and (pre-)cooling of the feed air; recuperative heat-exchange with product streams
- F25J3/04157—Afterstage cooling and so-called "pre-cooling" of the feed air upstream the air purification unit and main heat exchange line
-
- 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
- F25J2205/00—Processes or apparatus using other separation and/or other processing means
- F25J2205/30—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes
- F25J2205/32—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes as direct contact cooling tower to produce a cooled gas stream, e.g. direct contact after cooler [DCAC]
-
- 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
- F25J2205/00—Processes or apparatus using other separation and/or other processing means
- F25J2205/30—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes
- F25J2205/34—Processes or apparatus using other separation and/or other processing means using a washing, e.g. "scrubbing" or bubble column for purification purposes as evaporative cooling tower to produce chilled water, e.g. evaporative water chiller [EWC]
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Separation Of Gases By Adsorption (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は空気分離プロセスにおけ
る原料空気の前処理方法に関し、詳細には、空気分離プ
ロセスにおいて空気分離する前に、原料空気を冷却し、
更に空気中の水分及び炭酸ガスの吸着除去処理を行う原
料空気の前処理方法に関する。FIELD OF THE INVENTION The present invention relates to a method for pretreatment of feed air in an air separation process, and more particularly to cooling the feed air prior to air separation in the air separation process,
Further, the present invention relates to a pretreatment method of raw material air for adsorbing and removing moisture and carbon dioxide in the air.
【０００２】[0002]
【従来の技術】空気分離プロセスは空気を窒素、酸素、
Ar等に分離することを目的とするプロセスである。かか
る空気分離プロセスにおいて、原料空気は直接空気分離
処理されるのではなく、空気分離処理の前に原料空気の
前処理が行われ、しかる後に空気分離処理される。該前
処理としては、原料空気を冷却する処理（以降、前処理
Ａという）や、原料空気を冷却した後、さらに空気中の
水分及び炭酸ガスを除去する処理（以降、前処理Ｂとい
う）がある。2. Description of the Prior Art The process of air separation uses air to remove nitrogen, oxygen,
This is a process whose purpose is to separate into Ar and the like. In such an air separation process, the raw material air is not directly subjected to the air separation treatment, but the raw material air is pre-treated before the air separation treatment and then subjected to the air separation treatment. Examples of the pretreatment include a treatment of cooling the raw material air (hereinafter referred to as pretreatment A), and a treatment of cooling the raw material air and further removing moisture and carbon dioxide gas in the air (hereinafter referred to as pretreatment B). is there.
【０００３】かかる原料空気の前処理は次のような方法
により行われている。即ち、前処理Ａは、図２に示す如
く、蒸発冷却塔２で冷却水８を不純窒素ガス９と接触さ
せて冷却し、該冷却水８を水洗冷却塔１に送給し、該水
洗冷却塔１で原料空気７を冷却水８と接触させて冷却す
るものである。尚、この冷却に使用されて温度上昇した
冷却水８は蒸発冷却塔２に送給され、冷却される。The pretreatment of such raw material air is performed by the following method. That is, in the pretreatment A, as shown in FIG. 2, in the evaporative cooling tower 2, the cooling water 8 is brought into contact with the impure nitrogen gas 9 to be cooled, and the cooling water 8 is sent to the washing and cooling tower 1 to be washed and cooled. In the tower 1, the raw material air 7 is brought into contact with the cooling water 8 to be cooled. The cooling water 8 that has been used for this cooling and has increased in temperature is sent to the evaporative cooling tower 2 and cooled.
【０００４】前処理Ｂは、蒸発冷却塔２で冷却水８を不
純窒素ガス９と接触させて冷却し、更に冷凍装置４を有
する冷却器３により低温に冷却し、該冷却水８を水洗冷
却塔１に送給し、該水洗冷却塔１で原料空気７を冷却水
８と接触させて冷却し、該冷却後の空気７を複数の吸着
塔（図１の場合は２つの吸着塔5A、5B）の中の一部の吸
着塔5Aに送給して該空気７中の水分及び炭酸ガスの吸着
除去処理を行い、一方、該吸着除去処理に使用している
吸着塔5A以外の吸着塔5Bに吸着塔再生用不純窒素ガス10
を送給して該吸着塔5Bの再生処理を行うものである。In the pretreatment B, the cooling water 8 is brought into contact with the impure nitrogen gas 9 in the evaporative cooling tower 2 to be cooled, and further cooled to a low temperature by the cooler 3 having the refrigerating device 4, and the cooling water 8 is washed and cooled. The raw air 7 is sent to the tower 1 to be cooled by bringing the raw air 7 into contact with the cooling water 8 in the water-washing cooling tower 1, and the cooled air 7 is supplied to a plurality of adsorption towers (in the case of FIG. 1, two adsorption towers 5A, 5B) to a part of the adsorption towers 5A for adsorption and removal of water and carbon dioxide in the air 7, while the adsorption towers other than the adsorption tower 5A used for the adsorption and removal processing Impurity nitrogen gas for regeneration of adsorption tower 5B 10
Is fed to regenerate the adsorption tower 5B.
【０００５】尚、該吸着塔5Bの再生処理後、吸着塔5Aの
吸着機能が低下した時点で使用する吸着塔を切り換え、
以降吸着塔5Bで吸着除去処理を行い、吸着塔5Aの再生処
理を行う。かかる吸着塔5A又は5Bの再生処理の際に該吸
着塔から出てくる吸着塔再生用不純窒素ガスは、大気中
へ放出される。After the regeneration of the adsorption tower 5B, the adsorption tower to be used is switched when the adsorption function of the adsorption tower 5A is lowered,
After that, adsorption removal processing is performed in the adsorption tower 5B, and regeneration processing of the adsorption tower 5A is performed. Impurity nitrogen gas for regeneration of the adsorption tower, which is discharged from the adsorption tower during the regeneration treatment of the adsorption tower 5A or 5B, is released into the atmosphere.
【０００６】前処理Ｂにおいて上記の如く冷却水８を蒸
発冷却塔２で冷却するだけでなく、更に冷却器３により
低温に冷却するようにしているのは、冷却水８を吸着塔
5A又は5Bでの吸着除去処理に適した温度にするためであ
る。In the pretreatment B, not only the cooling water 8 is cooled by the evaporative cooling tower 2 as described above, but further the cooling water is cooled by the cooler 3 to a low temperature.
This is because the temperature is suitable for the adsorption removal treatment with 5A or 5B.
【０００７】[0007]
【発明が解決しようとする課題】ところが、前記従来の
空気分離プロセスにおける原料空気の前処理方法の中、
前処理Ｂにおいては、冷却水８をより低温（原料空気７
中水分及び炭酸ガスの吸着に適した温度）に冷却するた
め、蒸発冷却塔２の他に、冷凍装置４を有する冷却器３
の如き付加的冷却手段が必要であり、従って、装置費が
高くつき、又、冷却のためのエネルギが多いという問題
点があり、その改善が望まれている。However, among the methods for pretreatment of raw material air in the conventional air separation process,
In the pretreatment B, the cooling water 8 is cooled to a lower temperature (source air 7
In addition to the evaporative cooling tower 2, a cooler 3 having a refrigerating apparatus 4 for cooling to a temperature suitable for adsorption of medium water content and carbon dioxide gas)
Therefore, there is a problem that the cost of the apparatus is high and there is a large amount of energy for cooling, and an improvement thereof is desired.
【０００８】又、吸着塔の再生処理の際に該吸着塔から
出てくる吸着塔再生用不純窒素ガスは大気中へ放出され
る。この不純窒素ガスは後述の如く冷却作用を有してお
り、従って、かかる冷却作用を有する不純窒素ガスの大
気中への放出という損失を生じていることになる。Further, during the regeneration treatment of the adsorption tower, the impure nitrogen gas for regeneration of the adsorption tower, which comes out of the adsorption tower, is released into the atmosphere. This impure nitrogen gas has a cooling effect as described later, and therefore, the impure nitrogen gas having such a cooling effect is released to the atmosphere, which is a loss.
【０００９】本発明は、このような事情に着目してなさ
れたものであって、その目的は以上のような問題点を解
消し、原料空気の前処理に際し、吸着塔から出てくる吸
着塔再生用不純窒素ガスを有効活用することにより、前
記冷却器３の如き付加的冷却手段を不要化し得、その結
果、装置費及び冷却のためのエネルギを低減し得る空気
分離プロセスにおける原料空気の前処理方法を提供しよ
うとするものである。The present invention has been made in view of such circumstances, and its purpose is to solve the above problems and to adsorb the adsorbing tower coming out of the adsorbing tower during the pretreatment of the raw material air. By effectively utilizing the impure nitrogen gas for regeneration, additional cooling means such as the cooler 3 can be made unnecessary, and as a result, the cost of equipment and the energy for cooling can be reduced. It is intended to provide a processing method.
【００１０】[0010]
【課題を解決するための手段】上記目的を達成するため
に本発明は次のような構成の空気分離プロセスにおける
原料空気の前処理方法としている。即ち、本発明に係る
原料空気の前処理方法は、蒸発冷却塔で冷却水を不純窒
素ガスと接触させて冷却し、該冷却水を水洗冷却塔に送
給し、該水洗冷却塔で原料空気を冷却水と接触させて冷
却し、該冷却後の空気を複数の吸着塔の中の一部の吸着
塔に送給して該空気中の水分及び炭酸ガスの吸着除去処
理を行い、一方、該吸着除去処理に使用している吸着塔
以外の吸着塔に吸着塔再生用不純窒素ガスを送給して該
吸着塔の再生処理を行う空気分離プロセスにおける原料
空気の前処理方法において、前記吸着塔の再生処理の際
に吸着塔から出てくる吸着塔再生用不純窒素ガスを前記
蒸発冷却塔に送給して冷却水の冷却に利用することを特
徴とする空気分離プロセスにおける原料空気の前処理方
法である。In order to achieve the above object, the present invention provides a pretreatment method for raw material air in an air separation process having the following constitution. That is, the pretreatment method of the raw material air according to the present invention, the cooling water is contacted with impure nitrogen gas in the evaporative cooling tower to cool, the cooling water is fed to the washing cooling tower, the raw air in the washing cooling tower. Is contacted with cooling water to cool, and the cooled air is fed to a part of the adsorption towers of the plurality of adsorption towers to adsorb and remove water and carbon dioxide in the air, while In the pretreatment method of the raw material air in the air separation process for feeding the adsorption tower regeneration impure nitrogen gas to the adsorption tower other than the adsorption tower used for the adsorption removal treatment to regenerate the adsorption tower, the adsorption Before feed air in the air separation process, characterized in that the impure nitrogen gas for regeneration of the adsorption tower, which comes out of the adsorption tower during the regeneration treatment of the tower, is fed to the evaporative cooling tower to be used for cooling the cooling water. It is a processing method.
【００１１】[0011]
【作用】本発明に係る原料空気の前処理方法は、前記の
如く、吸着塔の再生処理の際に吸着塔から出てくる吸着
塔再生用不純窒素ガスを蒸発冷却塔に送給して冷却水の
冷却に利用するようにしている。As described above, the raw material air pretreatment method according to the present invention is performed by feeding impure nitrogen gas for regeneration of the adsorption tower, which is discharged from the adsorption tower during the regeneration treatment of the adsorption tower, to the evaporative cooling tower for cooling. It is used to cool water.
【００１２】上記吸着塔から出てくる吸着塔再生用不純
窒素ガスは、吸着塔の出口側において次のような状態に
あるので、冷却作用があって冷却水の冷却に利用でき
る。The impure nitrogen gas for regeneration of the adsorption tower, which comes out of the adsorption tower, is in the following state on the outlet side of the adsorption tower and therefore has a cooling action and can be used for cooling the cooling water.
【００１３】即ち、上記吸着塔出口側における不純窒素
ガスは、吸着塔再生の初期においては、吸着塔内の脱着
熱により、湿度は高くなっているが、従来の前処理Ｂに
おいて蒸発冷却塔での冷却水の冷却に使用する不純窒素
ガス（例えば、蒸発冷却塔２で冷却水８の冷却に使用す
る不純窒素ガス９）に比して温度が低い状態にあり、従
って、冷却作用があって冷却水の冷却に利用できる。That is, the impure nitrogen gas on the outlet side of the adsorption tower has a high humidity due to the heat of desorption in the adsorption tower at the initial stage of regeneration of the adsorption tower, but in the conventional pretreatment B, the impure nitrogen gas is used in the evaporative cooling tower. The temperature is lower than that of the impure nitrogen gas used for cooling the cooling water (for example, the impure nitrogen gas 9 used for cooling the cooling water 8 in the evaporative cooling tower 2), and therefore has a cooling effect. Can be used to cool cooling water.
【００１４】吸着塔再生の中期以降においては、再生用
不純窒素ガスとしては加熱されたものが使用され、その
ため吸着塔出口側における不純窒素ガスは、温度は比較
的高いが、湿度が低い状態にあり、従って、湿度が100%
になるまで水分の蒸発が可能であり、それに相当する蒸
発潜熱により冷却水を冷却し得る作用がある。After the middle stage of regeneration of the adsorption tower, heated impure nitrogen gas is used as the regeneration impure nitrogen gas. Therefore, the impure nitrogen gas at the outlet side of the adsorption tower has a relatively high temperature but low humidity. Yes, therefore 100% humidity
It is possible to evaporate the water until it becomes, and the cooling water can be cooled by the evaporation latent heat corresponding to the evaporation.
【００１５】そこで、本発明に係る原料空気の前処理方
法は、このような冷却作用を有する吸着塔出口側の不純
窒素ガス、即ち、吸着塔の再生処理の際に吸着塔から出
てくる吸着塔再生用不純窒素ガスを、蒸発冷却塔に送給
して冷却水の冷却に利用するようにしたのである。故
に、吸着塔再生処理の際に吸着塔から出てくる吸着塔再
生用不純窒素ガスの有する冷却作用を蒸発冷却塔での冷
却水の冷却に有効活用し得、従来の大気中への放出によ
り生じていた冷熱損失を回収できるようになる。又、蒸
発冷却塔において冷却水は、かかる不純窒素ガスによっ
ても冷却されるので、前記冷却器３の如き付加的冷却手
段を不要化し得、その結果、装置費及び冷却のためのエ
ネルギを低減し得るようになる。更に、かかる不純窒素
ガスの蒸発冷却塔への送給量等によっては、蒸発冷却塔
での冷却水の冷却に使用する不純窒素ガス（例えば、蒸
発冷却塔２で冷却水８の冷却に使用する不純窒素ガス
９）が少なくてすみ、その使用量の低減も可能となる。Therefore, in the method for pretreating raw material air according to the present invention, the impure nitrogen gas on the outlet side of the adsorption tower having such a cooling action, that is, the adsorption that comes out of the adsorption tower during the regeneration treatment of the adsorption tower. The impure nitrogen gas for tower regeneration was sent to the evaporative cooling tower and used for cooling the cooling water. Therefore, the cooling action of the impure nitrogen gas for adsorber tower regeneration that comes out of the adsorber tower during the adsorber tower regeneration treatment can be effectively utilized for cooling the cooling water in the evaporative cooler tower, and the conventional release to the atmosphere It is possible to recover the cold heat loss that has occurred. Further, since the cooling water in the evaporative cooling tower is also cooled by such impure nitrogen gas, additional cooling means such as the cooler 3 can be dispensed with, and as a result, the equipment cost and the energy for cooling can be reduced. I will get it. Further, depending on the amount of the impure nitrogen gas fed to the evaporative cooling tower, etc., the impure nitrogen gas used for cooling the cooling water in the evaporative cooling tower (for example, used for cooling the cooling water 8 in the evaporative cooling tower 2). The amount of impure nitrogen gas 9) is small, and the amount of use can be reduced.
【００１６】[0016]
【実施例】本発明の実施例を以下述べるが、本発明はこ
れら実施例によって限定されるものではない。EXAMPLES Examples of the present invention will be described below, but the present invention is not limited to these examples.
【００１７】本発明の実施例に係る原料空気の前処理方
法の状況を図１に示す。不純窒素ガス９を管16及び管18
を介して蒸発冷却塔２に送給すると共に、管16及び管17
を介して吸着塔5Aに送給して吸着塔5Aの再生処理を行
い、吸着塔5Aから出てくる不純窒素ガス99を管19及び管
25を介して蒸発冷却塔２に送給する。FIG. 1 shows the state of the pretreatment method for raw material air according to the embodiment of the present invention. Impurity nitrogen gas 9 is pipe 16 and pipe 18
It is sent to the evaporative cooling tower 2 via
Is fed to the adsorption tower 5A via the column to regenerate the adsorption tower 5A, and the impure nitrogen gas 99 coming out of the adsorption tower 5A is transferred to the pipe 19 and the pipe.
It is fed to the evaporative cooling tower 2 via 25.
【００１８】上記蒸発冷却塔２に送給された不純窒素ガ
ス９及び99は蒸発冷却塔２において冷却水８と接触し、
冷却水８を冷却する。該冷却水８を水ポンプ６により管
13及び管15を介して水洗冷却塔１に送給する。該冷却水
８は水洗冷却塔１において原料空気７と接触し、原料空
気７を冷却する。The impure nitrogen gases 9 and 99 fed to the evaporative cooling tower 2 come into contact with the cooling water 8 in the evaporative cooling tower 2,
The cooling water 8 is cooled. The cooling water 8 is piped by a water pump 6.
It is fed to the washing and cooling tower 1 through 13 and a pipe 15. The cooling water 8 comes into contact with the raw material air 7 in the washing and cooling tower 1 to cool the raw material air 7.
【００１９】該冷却後の空気７を吸着塔5Bに送給して該
空気７中の水分及び炭酸ガスの吸着除去処理を行う。
尚、該吸着除去処理後の空気７は空気分離処理に供さ
れ、窒素、酸素、Ar等に分離されることになる。一方、
水洗冷却塔１において原料空気７と接触して温度上昇し
た冷却水８は、管ａを介して蒸発冷却塔２に送給し、冷
却される。The cooled air 7 is fed to the adsorption tower 5B to carry out the adsorption and removal treatment of water and carbon dioxide in the air 7.
The air 7 after the adsorption removal process is subjected to an air separation process and separated into nitrogen, oxygen, Ar and the like. on the other hand,
The cooling water 8 that has been brought into contact with the raw material air 7 and whose temperature has risen in the water washing cooling tower 1 is sent to the evaporative cooling tower 2 via the pipe a and cooled.
【００２０】上記原料空気の前処理方法において、吸着
塔5Bの吸着機能が低下した時点で吸着塔を切り換える。
即ち、吸着塔5Aで吸着除去処理を行い、吸着塔5Bの再生
処理を行うようにする。尚、この吸着塔切り換え時以前
に吸着塔5Aは高度に再生されている。In the above pretreatment method for raw material air, the adsorption tower is switched when the adsorption function of the adsorption tower 5B is lowered.
That is, the adsorption removal process is performed in the adsorption tower 5A, and the regeneration process of the adsorption tower 5B is performed. It should be noted that the adsorption tower 5A has been highly regenerated before the switching of the adsorption tower.
【００２１】前記吸着塔5Aから出てくる不純窒素ガス99
を蒸発冷却塔２に送給する管19と管25との間における送
給ラインは、冷却水による水冷式（又は空気による空冷
式）の熱交換器24を途中に設けた送給ライン23と、その
バイパス送給ライン21との２系列にしている。各々の送
給ラインには切換弁20、22を設け、これらの切り換えに
より、送給ライン23又はバイパス送給ライン21を選択で
きる。Impurity nitrogen gas 99 discharged from the adsorption tower 5A
The transmission line between the pipe 19 and the pipe 25 for transmitting the water to the evaporative cooling tower 2 is a water-cooling type (or air-cooling type) heat exchanger 24 with cooling water. , And its bypass feed line 21 and two lines. Switching valves 20 and 22 are provided in each of the feeding lines, and the feeding line 23 or the bypass feeding line 21 can be selected by switching these.
【００２２】前記吸着塔5A又は5Bから出てくる不純窒素
ガス99は、吸着塔再生の初期においては温度が比較的低
いので、バイパス送給ライン21を用いて蒸発冷却塔２に
送給した。吸着塔再生の中期以降においては、温度が高
くなっているので、送給ライン23を用いて熱交換器24に
より冷却してから蒸発冷却塔２に送給した。尚、これら
の切り換えは切換弁20、22により行うものであるが、上
記不純窒素ガス99の特性（温度、湿度）の変化の度合
い、周期は略一定しているので、この切り換え操作は自
動化することも可能である。Since the impure nitrogen gas 99 discharged from the adsorption tower 5A or 5B has a relatively low temperature in the initial stage of regeneration of the adsorption tower, it was fed to the evaporative cooling tower 2 using the bypass feeding line 21. Since the temperature is high after the middle stage of the regeneration of the adsorption tower, it was cooled by the heat exchanger 24 using the feed line 23 and then fed to the evaporative cooling tower 2. These switching operations are performed by the switching valves 20 and 22, but since the degree of change in the characteristics (temperature, humidity) of the impure nitrogen gas 99 and the cycle are substantially constant, this switching operation is automated. It is also possible.
【００２３】上記の如き原料空気の前処理を連続的又は
断続的に繰り返して行った。その結果、従来の原料空気
の前処理Ｂの場合と同様に冷却され、水分及び炭酸ガス
が除去された原料空気を得ることができ、そして空気分
離処理に供して窒素、酸素、Ar等に分離し得た。The pretreatment of the raw material air as described above was repeated continuously or intermittently. As a result, it is possible to obtain the raw material air that has been cooled in the same manner as in the case of the pretreatment B of the conventional raw material air and from which water and carbon dioxide have been removed, and is subjected to an air separation treatment to separate it into nitrogen, oxygen, Ar, etc. It was possible.
【００２４】従って、上記原料空気の前処理方法は、吸
着塔5A又は5Bから出てくる不純窒素ガス99を蒸発冷却塔
２での冷却水８の冷却に有効活用し得、従来の大気中へ
の放出により生じていた冷熱損失を回収できるようにな
る。又、前記冷却器３の如き付加的冷却手段が不要であ
って、装置費及び冷却のためのエネルギを低減し得るよ
うになる。尚、送給ライン23に水冷式又は空冷式の熱交
換器24を設けているが、かかる熱交換器24は前記冷却器
３に比して装置費が安価であり、又、冷却水により冷却
であるので運転コストも安く、経済性を損なわず、むし
ろ総合的には経済性を向上し得るものである。Therefore, in the pretreatment method for the raw material air, the impure nitrogen gas 99 discharged from the adsorption tower 5A or 5B can be effectively used for cooling the cooling water 8 in the evaporative cooling tower 2, and the conventional atmospheric air can be used. It becomes possible to recover the cold heat loss caused by the emission of Also, no additional cooling means such as the cooler 3 is required, and the cost of the device and the energy for cooling can be reduced. A water-cooling type or air-cooling type heat exchanger 24 is provided in the feeding line 23, but the heat exchanger 24 is less expensive than the cooler 3 and is cooled by cooling water. Therefore, the operating cost is low, the economic efficiency is not impaired, and the economic efficiency can be improved as a whole.
【００２５】[0025]
【発明の効果】本発明に係る空気分離プロセスにおける
原料空気の前処理方法によれば、吸着塔再生処理の際に
吸着塔から出てくる吸着塔再生用不純窒素ガスの有する
冷却作用を蒸発冷却塔での冷却水の冷却に有効活用し
得、従来の大気中への放出により生じていた冷熱損失を
回収できるようになる。又、蒸発冷却塔において冷却水
は、かかる不純窒素ガスによっても冷却されるので、従
来水洗冷却塔に付設していた付加的冷却手段を不要化し
得、その結果、装置費及び冷却のためのエネルギを低減
し得るようになる。更に、かかる不純窒素ガスの蒸発冷
却塔への送給量等によっては、この不純窒素ガスと並行
して蒸発冷却塔に直接導入する冷却水冷却用不純窒素ガ
スの必要量（使用量）を低減し得るようにもなる。従っ
て、前処理後の原料空気の品質（特性）の低下を招くこ
となく、原料空気の前処理のためのイニシャルコスト及
びランニングコストを低減し得るようになる。According to the pretreatment method for raw material air in the air separation process according to the present invention, the cooling action of the impure nitrogen gas for adsorber tower regeneration that comes out of the adsorber tower during the adsorber tower regeneration treatment is evaporated and cooled. It can be effectively used for cooling the cooling water in the tower, and it becomes possible to recover the cold heat loss generated by the conventional release into the atmosphere. Further, since the cooling water in the evaporative cooling tower is also cooled by such impure nitrogen gas, the additional cooling means conventionally attached to the water washing cooling tower can be made unnecessary, resulting in equipment cost and energy for cooling. Can be reduced. Furthermore, depending on the amount of impure nitrogen gas sent to the evaporative cooling tower, etc., the required amount (use amount) of impure nitrogen gas for cooling water to be introduced directly into the evaporative cooling tower in parallel with this impure nitrogen gas can be reduced. You will also be able to do so. Therefore, the initial cost and the running cost for the pretreatment of the raw material air can be reduced without lowering the quality (characteristics) of the raw material air after the pretreatment.
【図１】本発明の実施例に係る原料空気の前処理方法の
状況の概要を示す図である。FIG. 1 is a diagram showing an outline of a situation of a pretreatment method for raw material air according to an embodiment of the present invention.
【図２】従来の原料空気の前処理方法の中の冷却・空気
中水分及び炭酸ガス吸着除去方式の状況の概要を示す図
である。FIG. 2 is a diagram showing an outline of a state of a cooling / water in-air and carbon dioxide adsorption / removal method in a conventional raw material air pretreatment method.
１--水洗冷却塔 ２--蒸発冷却塔 ３--冷却器
４--冷凍装置 5A，5B--吸着塔 ６--水ポンプ ７--原料空気
８--冷却水 ９--不純窒素ガス 10--吸着塔再生用不純窒素ガス 1
1，12，13，14，15--管 16，17，18，19，25--管 20，22--切換弁 21--バ
イパス送給ライン 23--送給ライン 24--熱交換器 99--吸着塔から
出てくる不純窒素ガス ａ--管1--Washing cooling tower 2--Evaporation cooling tower 3--Cooler
4--Refrigerator 5A, 5B--Adsorption tower 6--Water pump 7--Material air
8--Cooling water 9--Impurity nitrogen gas 10--Impurity nitrogen gas for regeneration of adsorption tower 1
1, 12, 13, 14, 15--Pipe 16, 17, 18, 19, 25--Pipe 20, 22--Switching valve 21--Bypass feed line 23--Feed line 24--Heat exchanger 99--impurity nitrogen gas coming out of adsorption tower a--tube
Claims (1)
触させて冷却し、該冷却水を水洗冷却塔に送給し、該水
洗冷却塔で原料空気を冷却水と接触させて冷却し、該冷
却後の空気を複数の吸着塔の中の一部の吸着塔に送給し
て該空気中の水分及び炭酸ガスの吸着除去処理を行い、
一方、該吸着除去処理に使用している吸着塔以外の吸着
塔に吸着塔再生用不純窒素ガスを送給して該吸着塔の再
生処理を行う空気分離プロセスにおける原料空気の前処
理方法において、前記吸着塔の再生処理の際に吸着塔か
ら出てくる吸着塔再生用不純窒素ガスを前記蒸発冷却塔
に送給して冷却水の冷却に利用することを特徴とする空
気分離プロセスにおける原料空気の前処理方法。1. An evaporative cooling tower cools cooling water by contacting it with impure nitrogen gas, feeds the cooling water to the washing cooling tower, and cools the raw air by contacting the cooling water with the washing cooling tower. , The air after cooling is fed to a part of the adsorption towers of a plurality of adsorption towers to perform adsorption removal processing of water and carbon dioxide in the air,
On the other hand, in the pretreatment method of the raw material air in the air separation process for feeding the adsorption tower regeneration impure nitrogen gas to the adsorption tower other than the adsorption tower used for the adsorption removal treatment to perform the regeneration treatment of the adsorption tower, Raw air in an air separation process, characterized in that an impure nitrogen gas for adsorbing tower regeneration that comes out of the adsorbing tower during the regeneration treatment of the adsorbing tower is fed to the evaporative cooling tower to be used for cooling the cooling water. Pretreatment method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3343356A JP2944285B2 (en) | 1991-12-25 | 1991-12-25 | Pretreatment method of raw air in air separation process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3343356A JP2944285B2 (en) | 1991-12-25 | 1991-12-25 | Pretreatment method of raw air in air separation process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05172459A true JPH05172459A (en) | 1993-07-09 |
| JP2944285B2 JP2944285B2 (en) | 1999-08-30 |
Family
ID=18360893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3343356A Expired - Lifetime JP2944285B2 (en) | 1991-12-25 | 1991-12-25 | Pretreatment method of raw air in air separation process |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2944285B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2712509A1 (en) * | 1993-11-19 | 1995-05-24 | Air Liquide | Process and installation for air distillation. |
| EP2042824A1 (en) * | 2007-09-28 | 2009-04-01 | Linde Aktiengesellschaft | Start-up method for the separation of air by cryogenic distillation and apparatus for the separation of air by cryogenic distillation |
| KR100905616B1 (en) * | 2002-12-23 | 2009-07-02 | 주식회사 포스코 | A method for regenerating the air purification unit using a liquid air of tank |
| JP2013204838A (en) * | 2012-03-27 | 2013-10-07 | Taiyo Nippon Sanso Corp | Method and device for pretreatment in low-temperature cryogenic separation of air |
| CN106288655A (en) * | 2016-10-10 | 2017-01-04 | 浙江海天气体有限公司 | Liquid nitrogen tank emptying low temperature nitrogen is utilized to make the air precooler of low-temperature receiver |
| CN111707054A (en) * | 2020-06-18 | 2020-09-25 | 中冶西北工程技术有限公司 | Air separation cold energy recovery system |
-
1991
- 1991-12-25 JP JP3343356A patent/JP2944285B2/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2712509A1 (en) * | 1993-11-19 | 1995-05-24 | Air Liquide | Process and installation for air distillation. |
| EP0654643A1 (en) * | 1993-11-19 | 1995-05-24 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Process and installation for the distillation of air |
| US5505050A (en) * | 1993-11-19 | 1996-04-09 | L'air Liquide, Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Process and installation for the distillation of air |
| KR100905616B1 (en) * | 2002-12-23 | 2009-07-02 | 주식회사 포스코 | A method for regenerating the air purification unit using a liquid air of tank |
| EP2042824A1 (en) * | 2007-09-28 | 2009-04-01 | Linde Aktiengesellschaft | Start-up method for the separation of air by cryogenic distillation and apparatus for the separation of air by cryogenic distillation |
| JP2013204838A (en) * | 2012-03-27 | 2013-10-07 | Taiyo Nippon Sanso Corp | Method and device for pretreatment in low-temperature cryogenic separation of air |
| CN106288655A (en) * | 2016-10-10 | 2017-01-04 | 浙江海天气体有限公司 | Liquid nitrogen tank emptying low temperature nitrogen is utilized to make the air precooler of low-temperature receiver |
| CN111707054A (en) * | 2020-06-18 | 2020-09-25 | 中冶西北工程技术有限公司 | Air separation cold energy recovery system |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2944285B2 (en) | 1999-08-30 |
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