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JP2017009166A - Air separation facility and its operational method - Google Patents

Air separation facility and its operational method Download PDF

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JP2017009166A
JP2017009166A JP2015123831A JP2015123831A JP2017009166A JP 2017009166 A JP2017009166 A JP 2017009166A JP 2015123831 A JP2015123831 A JP 2015123831A JP 2015123831 A JP2015123831 A JP 2015123831A JP 2017009166 A JP2017009166 A JP 2017009166A
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air separation
liquid
air
main condenser
separation device
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翔之介 前川
Shonosuke Maekawa
翔之介 前川
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JFE Steel Corp
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    • 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
    • F25J3/04951—Arrangements of multiple air fractionation units or multiple equipments fulfilling the same process step, e.g. multiple trains in a network
    • F25J3/04963—Arrangements of multiple air fractionation units or multiple equipments fulfilling the same process step, e.g. multiple trains in a network and inter-connecting equipment within or downstream of the fractionation unit(s)
    • 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
    • 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
    • F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
    • F25J3/04812—Different modes, i.e. "runs" of operation
    • F25J3/04818—Start-up of the process
    • 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
    • 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
    • F25J2245/50—Processes or apparatus involving steps for recycling of process streams the recycled stream being oxygen

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Oxygen, Ozone, And Oxides In General (AREA)
  • Separation By Low-Temperature Treatments (AREA)

Abstract

【課題】複数の空気分離装置を備えた空気分離設備において、空気分離装置の起動から定常運転までに要する時間を短縮し、空気分離効率を向上させる。【解決手段】本発明に係る空気分離設備は、上塔、下塔および主凝縮器を有し原料空気より窒素および酸素を精留分離する精留塔が設けられた複数の空気分離装置を備えた空気分離設備であって、一の空気分離装置の主凝縮器に設けられた液体酸素の貯留部と、他の少なくとも１つの空気分離装置の主凝縮器に設けられた液体酸素の貯留部とを接続する液体酸素供給管と、一の空気分離装置の主凝縮器に設けられた液体窒素の貯留部と、他の少なくとも１つの空気分離装置の主凝縮器に設けられた液体窒素の貯留部とを接続する液体窒素供給管とを有する。【選択図】図１In an air separation facility provided with a plurality of air separation devices, the time required from the start of the air separation device to a steady operation is shortened, and the air separation efficiency is improved. An air separation facility according to the present invention includes a plurality of air separation devices having an upper tower, a lower tower, and a main condenser, and provided with a rectifying tower for rectifying and separating nitrogen and oxygen from raw air. A liquid oxygen storage section provided in a main condenser of one air separation apparatus, and a liquid oxygen storage section provided in a main condenser of at least one other air separation apparatus. A liquid oxygen supply pipe connected to each other, a liquid nitrogen storage section provided in a main condenser of one air separation device, and a liquid nitrogen storage section provided in a main condenser of at least one other air separation device And a liquid nitrogen supply pipe connecting the two. [Selection] Figure 1

Description

本発明は、複数の深冷分離型の空気分離装置を備えた空気分離設備およびその運転方法に関する。   The present invention relates to an air separation facility including a plurality of cryogenic separation type air separation devices and an operation method thereof.

従来より、空気中の酸素と窒素を、沸点差を利用して精留分離する深冷分離型の空気分離装置が知られている。空気分離装置は、法令により定期的な検査が義務付けられており、検査時には、空気分離装置を停止させて、検査を行う必要がある。   2. Description of the Related Art Conventionally, a cryogenic separation type air separation device that rectifies and separates oxygen and nitrogen in air using a difference in boiling point is known. The air separation device is required to be regularly inspected by law. At the time of inspection, it is necessary to stop the air separation device and perform the inspection.

製鉄所の高炉や転炉など、常時、酸素の供給を必要とする場所では、複数の空気分離装置を設置し、１つの空気分離装置の検査中には、他の空気分離装置を運転して、酸素を常時生成し、高炉や転炉に供給している。   In places where oxygen supply is always required, such as blast furnaces and converters in steelworks, multiple air separation devices are installed, and during the inspection of one air separation device, other air separation devices are operated. Oxygen is constantly generated and supplied to blast furnaces and converters.

運転中の空気分離装置は、系内の物質および熱がバランスした状態となっているが、検査のために運転を停止した後に再稼働させると、物質および熱がバランスした状態になるまでに長い時間がかかるという課題がある。   The air separation device in operation is in a state where the substance and heat in the system are balanced, but if it is restarted after stopping operation for inspection, it will take a long time until the substance and heat become balanced. There is a problem that it takes time.

これに対し、特許文献１には、「原料空気を酸素と窒素に分離する高圧蒸留塔と低圧蒸留塔と、分離された液状の酸素または液状の窒素を貯溜する液体貯槽、および、圧縮された原料空気を熱源とし、前記液状酸素および／または液状窒素を気化させて製品ガスとする熱交換器を備えた空気分離装置において、前記蒸留塔と前記液体貯槽を結ぶラインに液体抜出量調節弁が設けられると共に、該液体抜出量調節弁を閉止した際に該蒸留塔とは独立して該液体貯槽内の圧力を調整するための加圧手段を備えていることを特徴とする空気分離装置」が開示されている。   On the other hand, Patent Document 1 states that “a high-pressure distillation column and a low-pressure distillation column that separate raw air into oxygen and nitrogen, a liquid storage tank that stores separated liquid oxygen or liquid nitrogen, and a compressed state. In an air separation apparatus having a heat exchanger using raw material air as a heat source and vaporizing liquid oxygen and / or liquid nitrogen to produce product gas, a liquid discharge amount regulating valve is connected to a line connecting the distillation tower and the liquid storage tank. And a pressurizing means for adjusting the pressure in the liquid storage tank independently of the distillation column when the liquid extraction amount regulating valve is closed. An apparatus "is disclosed.

特許文献１では、蒸留塔と液体貯槽を結ぶラインに液体抜出量調節弁を設けると共に、該液体抜出量調節弁を閉止した際に該蒸留塔とは独立して該液体貯槽内の圧力を調整するための加圧手段を付設することで、再稼動後に、液体抜出量調節弁を閉止したまま、加圧手段によって液体貯槽内の液体を熱交換器方向へ圧送し、圧縮された原料空気を熱源として該液体を気化させることで、製品ガスを取り出せるように工夫している。   In Patent Document 1, a liquid extraction amount adjusting valve is provided in a line connecting the distillation column and the liquid storage tank, and the pressure in the liquid storage tank is independent of the distillation tower when the liquid extraction amount adjusting valve is closed. By attaching a pressurizing means for adjusting the pressure, the liquid in the liquid storage tank was pumped by the pressurizing means in the direction of the heat exchanger and compressed after the re-operation, with the liquid discharge amount adjusting valve closed. It is devised so that the product gas can be taken out by evaporating the liquid using raw material air as a heat source.

特許文献２には、「所定圧に圧縮された原料空気を系内で発生した寒冷との熱交換により冷却する原料空気圧縮冷却工程、およびこの原料空気圧縮冷却工程からの液体空気を下塔とこの下塔の近傍に設けられた上塔とからなる精留塔で精留する精留工程とから構成され、上記精留工程では、精留塔の下塔で上記空気を精留して塔頂部に気体窒素を集め、上塔と下塔との間に設けられた主凝縮器部において上記集められた気体窒素を凝縮し還流液として下塔の塔頂部に戻すとともに、下塔の底部に滞留する富酸素液と、下塔塔頂部の液体窒素とを還流液として上塔に使用する空気分離方法において、上記上塔の液を貯留する液留容器を設け、空気分離装置の運転を停止するに際し上塔内の液を上記液留容器内に導入して貯留するとともに、空気分離装置の運転を再開するに際し上記液留容器内に貯留されている液を精留用の還流液として精留塔上塔に戻すことを特徴とする空気分離装置のクイックスタート方法」が開示されている。   Patent Document 2 states that "a raw material air compression cooling process for cooling raw material air compressed to a predetermined pressure by heat exchange with the cold generated in the system, and liquid air from this raw material air compression cooling process is used as a lower tower. A rectifying step for rectifying in a rectifying column comprising an upper column provided in the vicinity of the lower column. In the rectifying step, the air is rectified in the lower column of the rectifying column. Gaseous nitrogen is collected at the top, and the collected gaseous nitrogen is condensed in a main condenser section provided between the upper and lower towers and returned to the top of the lower tower as a reflux liquid, and at the bottom of the lower tower. In the air separation method using the retained oxygen-rich liquid and the liquid nitrogen at the top of the lower tower as the reflux liquid in the upper tower, a liquid distillation container for storing the liquid in the upper tower is provided, and the operation of the air separation device is stopped. In doing so, the liquid in the upper column is introduced and stored in the liquid container, and air Disclosed is a quick start method for an air separation device characterized in that when the operation of the separation device is resumed, the liquid stored in the liquid distillation vessel is returned to the upper column of the rectification column as a reflux liquid for rectification. Yes.

特開２００４−１９７９８１号公報JP 2004-197981 A 特開平９−６１０５２号公報Japanese Patent Laid-Open No. 9-61052

しかしながら、特許文献１では、液体貯槽内の圧力を調整するための加圧手段を付設し、圧力を制御する必要があり、制御が複雑になるという問題がある。   However, in Patent Document 1, it is necessary to add a pressurizing means for adjusting the pressure in the liquid storage tank to control the pressure, and there is a problem that the control becomes complicated.

また、特許文献２では、主凝縮器部とは別に、上塔の液を貯留する液留容器を設置する必要があり、構造およびその制御が複雑になるという問題がある。   Moreover, in patent document 2, it is necessary to install the liquid distillation container which stores the liquid of an upper tower separately from a main condenser part, and there exists a problem that a structure and its control become complicated.

本発明は、このような問題点に対してなされたものであり、複数の空気分離装置を備えた空気分離設備において、簡易な構成で、空気分離装置の起動から定常運転までに要する時間を短縮することができる空気分離設備およびその運転方法を提供することを目的とする。   The present invention has been made for such problems, and in an air separation facility having a plurality of air separation devices, the time required from the start of the air separation device to steady operation is reduced with a simple configuration. An object of the present invention is to provide an air separation facility that can be used and a method of operating the same.

本発明は、上述のような目的を達成するために、以下のような特徴を有している。
［１］ 上塔、下塔および主凝縮器を有し原料空気より窒素および酸素を精留分離する精留塔が設けられた複数の空気分離装置を備えた空気分離設備であって、
一の空気分離装置の主凝縮器に設けられた液体酸素の貯留部と、他の少なくとも１つの空気分離装置の主凝縮器に設けられた液体酸素の貯留部とを接続する液体酸素供給管と、
一の空気分離装置の主凝縮器に設けられた液体窒素の貯留部と、他の少なくとも１つの空気分離装置の主凝縮器に設けられた液体窒素の貯留部とを接続する液体窒素供給管とを有する空気分離設備。
［２］ 上塔、下塔および主凝縮器を有し原料空気より窒素および酸素を精留分離する精留塔が設けられた複数の空気分離装置を備えた空気分離設備の運転方法であって、
一の空気分離装置を起動する際に、これから停止を行う他の少なくとも１つの空気分離装置の主凝縮器に貯留された液体酸素および液体窒素を、一の空気分離装置の主凝集器の液体酸素および液体窒素が貯留される部分にそれぞれ供給する空気分離設備の運転方法。 The present invention has the following features in order to achieve the above object.
[1] An air separation facility comprising a plurality of air separation devices having an upper tower, a lower tower, and a main condenser and provided with a rectifying tower for rectifying and separating nitrogen and oxygen from raw air,
A liquid oxygen supply pipe for connecting a liquid oxygen storage section provided in a main condenser of one air separation device and a liquid oxygen storage section provided in a main condenser of at least one other air separation device; ,
A liquid nitrogen supply pipe connecting a liquid nitrogen storage section provided in a main condenser of one air separation device and a liquid nitrogen storage section provided in a main condenser of at least one other air separation device; Having air separation equipment.
[2] A method of operating an air separation facility comprising a plurality of air separation devices having an upper tower, a lower tower, and a main condenser and provided with a rectifying tower for rectifying and separating nitrogen and oxygen from raw air. ,
When starting one air separation device, the liquid oxygen and liquid nitrogen stored in the main condenser of at least one other air separation device to be stopped from now are used as the liquid oxygen of the main aggregator of one air separation device. And an operation method of an air separation facility for supplying liquid nitrogen to the portions where liquid nitrogen is stored.

本発明によれば、複数の空気分離装置を備えた空気分離設備において、空気分離装置の起動から定常運転までに要する時間を短縮し、空気分離効率を向上させることができる。   ADVANTAGE OF THE INVENTION According to this invention, in the air separation equipment provided with the several air separation apparatus, the time required from starting of an air separation apparatus to a steady operation can be shortened, and air separation efficiency can be improved.

本発明の実施の形態に係る空気分離設備の構成を示す図である。It is a figure which shows the structure of the air separation equipment which concerns on embodiment of this invention.

以下、添付した図面を参照して、本発明の実施の形態について説明する。   Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

図１は、本発明の実施の形態に係る空気分離設備の構成を示す図である。   FIG. 1 is a diagram showing a configuration of an air separation facility according to an embodiment of the present invention.

この空気分離設備は、略同一構成を有する２つの空気分離装置１１、１２を備えている。空気分離装置１１は、空気圧縮器１１０と、熱交換器１１１と、精留塔１１２とを有している。精留塔１１２は、上塔１１２ａ、下塔１１２ｂおよび主凝縮器１１２ｃを有している。同様に、空気分離装置１２は、空気圧縮器１２０と、熱交換器１２１と、精留塔１２２を有している。精留塔１２２は、上塔１２２ａ、下塔１２２ｂおよび主凝縮器１２２ｃを有している。   This air separation facility includes two air separation devices 11 and 12 having substantially the same configuration. The air separation device 11 includes an air compressor 110, a heat exchanger 111, and a rectification column 112. The rectification column 112 includes an upper column 112a, a lower column 112b, and a main condenser 112c. Similarly, the air separation device 12 includes an air compressor 120, a heat exchanger 121, and a rectification tower 122. The rectifying column 122 includes an upper column 122a, a lower column 122b, and a main condenser 122c.

空気分離装置１１と空気分離装置１２は、略同一構成を有している。ここでは、空気分離装置１１の各構成を例にして説明を行い、空気分離装置１２の各構成の説明を省略する。   The air separation device 11 and the air separation device 12 have substantially the same configuration. Here, each configuration of the air separation device 11 will be described as an example, and description of each configuration of the air separation device 12 will be omitted.

原料空気を、圧縮器１１０で圧縮し、図示しない吸着塔により水分及び二酸化炭素を除去し、清浄にする。清浄後の圧縮空気は、熱交換器１１１で露点付近まで冷却され、下塔１１２ｂの底部へ導入される。下塔１１２ｂでの精留により、液化空気は、窒素ガスと酸素に富む液化空気（以下、酸素富化液化空気という）とに分離され、窒素ガスは塔頂部に、酸素富化液化空気は底部に溜まる。塔頂部の窒素ガスは、主凝縮器１１２ｃによって凝縮し、液化窒素となる。この液化窒素の一部は、配管等を介して、上塔１１２ａの上段に環流液として供給される。   The raw material air is compressed by the compressor 110, and moisture and carbon dioxide are removed by an adsorption tower (not shown) to be cleaned. The cleaned compressed air is cooled to near the dew point by the heat exchanger 111 and introduced into the bottom of the lower tower 112b. By rectification in the lower tower 112b, the liquefied air is separated into nitrogen gas and oxygen-rich liquefied air (hereinafter referred to as oxygen-enriched liquefied air), with the nitrogen gas at the top of the tower and the oxygen-enriched liquefied air at the bottom. Accumulate. The nitrogen gas at the top of the column is condensed by the main condenser 112c and becomes liquefied nitrogen. A part of this liquefied nitrogen is supplied as a reflux liquid to the upper stage of the upper tower 112a via a pipe or the like.

一方、下塔１１２ｂの窒素ガスは、下塔１１２ｂの上部から抜き出され、図示していない熱交換器、膨張タービンに送られ、装置全体を冷却する寒冷を得るために使用される。下塔１１２ｂの底部の酸素富化液化空気は、底部より抜き出され、一部がガス化した状態で上塔１１２ａの中段に導入される。   On the other hand, the nitrogen gas in the lower tower 112b is extracted from the upper part of the lower tower 112b, sent to a heat exchanger and an expansion turbine (not shown), and used to obtain coldness for cooling the entire apparatus. The oxygen-enriched liquefied air at the bottom of the lower tower 112b is extracted from the bottom and introduced into the middle stage of the upper tower 112a in a partially gasified state.

上塔１１２ａでは、主凝縮器１１２ｃから導入された液化窒素と、下塔１１２ｂの底部から中段に導入された酸素富化液化空気が塔内を下降し、上塔１１２ａに導入された液が、主凝縮器１１２ｃにおいてほぼ全量が気化して塔内を上昇する。この下降液と上昇ガスとにより精留が行われ、酸素及び窒素の分離が行われる。その結果、上塔１１２ａの塔頂部から窒素ガスが、下部から酸素ガスが排出される。   In the upper tower 112a, liquefied nitrogen introduced from the main condenser 112c and oxygen-enriched liquefied air introduced from the bottom of the lower tower 112b to the middle stage descend in the tower, and the liquid introduced into the upper tower 112a is In the main condenser 112c, almost the entire amount is vaporized and rises in the tower. Rectification is performed by the descending liquid and the ascending gas, and oxygen and nitrogen are separated. As a result, nitrogen gas is discharged from the top of the upper tower 112a and oxygen gas is discharged from the bottom.

上塔１１２ａの塔頂部から抜き出された窒素ガスは、熱交換器１１１に送られ、常温まで昇温される。さらに、上塔１１２ａの下部からは、液体酸素は、熱交換器１１１に送られ、常温まで昇温される。   Nitrogen gas extracted from the top of the upper tower 112a is sent to the heat exchanger 111, where the temperature is raised to room temperature. Furthermore, from the lower part of the upper tower 112a, liquid oxygen is sent to the heat exchanger 111 and the temperature is raised to room temperature.

主凝縮器１１２ｃには、上塔１１２ａから下降した液（主に、液体酸素）を貯留する液体酸素貯留部（図示せず）と、下塔１１２ｂの塔頂部から取り出された窒素ガスが凝縮した液体窒素を貯留する液体窒素貯留部（図示せず）が設けられている。この液体窒素貯留部に貯留された液体窒素は、空気分離装置１１の全体を冷却するための寒冷として利用される。液体酸素貯留部および液体窒素貯留部は、主凝縮器１１２ｃにもともと設けられている部分である。   In the main condenser 112c, a liquid oxygen storage part (not shown) for storing liquid (mainly liquid oxygen) descending from the upper tower 112a and nitrogen gas taken out from the top of the lower tower 112b are condensed. A liquid nitrogen storage part (not shown) for storing liquid nitrogen is provided. The liquid nitrogen stored in the liquid nitrogen storage unit is used as cold for cooling the entire air separation device 11. The liquid oxygen storage part and the liquid nitrogen storage part are parts originally provided in the main condenser 112c.

本発明に係る空気分離設備では、空気分離装置１１の主凝縮器１１２ｃに設けられた液体酸素貯留部と、空気分離装置１２の主凝縮器１２２ｃに設けられた液体酸素貯留部とを接続する液体酸素供給管１３を新たに設置する。また、本発明に係る空気分離設備では、空気分離装置１１の主凝縮器１１２ｃに設けられた液体窒素貯留部と、空気分離装置１２の主凝縮器１２２ｃに設けられた液体窒素貯留部とを接続する液体窒素供給管１４を新たに設置する。   In the air separation facility according to the present invention, the liquid that connects the liquid oxygen reservoir provided in the main condenser 112c of the air separator 11 and the liquid oxygen reservoir provided in the main condenser 122c of the air separator 12 is used. An oxygen supply pipe 13 is newly installed. In the air separation facility according to the present invention, the liquid nitrogen reservoir provided in the main condenser 112c of the air separator 11 and the liquid nitrogen reservoir provided in the main condenser 122c of the air separator 12 are connected. A liquid nitrogen supply pipe 14 is newly installed.

空気分離装置１１と空気分離装置１２は、相互に液体酸素供給管１３および液体窒素供給管１４を介して、液体酸素または液体窒素を供給できる構成になっている。   The air separation device 11 and the air separation device 12 are configured to be able to supply liquid oxygen or liquid nitrogen to each other via the liquid oxygen supply pipe 13 and the liquid nitrogen supply pipe 14.

なお、液体酸素供給管１３および液体窒素供給管１４は、空気分離装置１１から空気分離装置１２へ供給するものと、空気分離装置１２から空気分離装置１１へ供給するものとをそれぞれ設けてもよく、液体酸素供給管１３および液体窒素供給管１４を１つずつ設けて、供給方向を切替弁などで切り替えるように構成してもよい。   The liquid oxygen supply pipe 13 and the liquid nitrogen supply pipe 14 may each be provided with a pipe that supplies air from the air separator 11 to the air separator 12 and a pipe that supplies air from the air separator 12 to the air separator 11. The liquid oxygen supply pipe 13 and the liquid nitrogen supply pipe 14 may be provided one by one, and the supply direction may be switched by a switching valve or the like.

次に、本発明の実施の形態に係る空気分離設備の運転方法について説明する。空気分離装置は、法令により定期的な検査が義務付けられており、検査時には、空気分離装置を停止させて、検査を行う必要がある。   Next, an operation method of the air separation facility according to the embodiment of the present invention will be described. The air separation device is required to be regularly inspected by law. At the time of inspection, it is necessary to stop the air separation device and perform the inspection.

製鉄所の高炉や転炉など、常時、酸素の供給を必要とする場所では、複数の空気分離装置を設置し、１つの空気分離装置の検査中には、他の空気分離装置を運転して、酸素を常時生成し、高炉や転炉に供給している。   In places where oxygen supply is always required, such as blast furnaces and converters in steelworks, multiple air separation devices are installed, and during the inspection of one air separation device, other air separation devices are operated. Oxygen is constantly generated and supplied to blast furnaces and converters.

本発明では、このような常時、酸素の供給を必要とする場所に設置された空気分離設備において、停止していた一の空気分離装置を再起動させる際に、これから停止を行う他の空気分離装置の主凝縮器に貯留されている液体酸素および液体窒素を一の空気分離装置へ供給する。   In the present invention, in such an air separation facility that is always installed in a place where oxygen supply is required, when the one air separation device that has been stopped is restarted, another air separation to be stopped from now on. Liquid oxygen and liquid nitrogen stored in the main condenser of the apparatus are supplied to one air separation apparatus.

具体的には、定常運転時において、主凝縮器では、液体酸素と気体窒素の間で熱交換が行われるが、本発明では、再起動を行う空気分離装置の主凝縮器に、停止する空気分離装置から液体酸素を供給することで、起動直後から主凝縮器において、空気中に含まれる窒素と、停止する空気分離装置から供給された液体酸素との間で熱交換を行うことができ、起動時から定常運転までに要する時間を短縮することができる。   Specifically, during steady operation, the main condenser performs heat exchange between liquid oxygen and gaseous nitrogen. In the present invention, the main condenser of the air separation device that is restarted is stopped by the main condenser. By supplying liquid oxygen from the separation device, heat exchange can be performed between nitrogen contained in the air and liquid oxygen supplied from the air separation device to be stopped in the main condenser immediately after startup. The time required from startup to steady operation can be shortened.

また、定常運転時において、主凝縮器で生成された液体窒素は、空気分離装置の全体を冷却するための寒冷として利用されるが、本発明では、再起動を行う空気分離装置の主凝縮器に、停止する空気分離装置から液体窒素を供給することで、再起動を行う空気分離装置の起動時から定常運転までに要する時間を短縮することができる。   Further, during steady operation, the liquid nitrogen generated in the main condenser is used as cold for cooling the entire air separation device, but in the present invention, the main condenser of the air separation device that performs restart is used. In addition, by supplying liquid nitrogen from the air separation device to be stopped, the time required from the start of the air separation device to be restarted to the steady operation can be shortened.

本発明では、液体酸素供給管１３および液体窒素供給管１４を設置し、一方の空気分離装置を再起動させる際には、他の空気分離装置から液体酸素および液体窒素を供給することで、簡易な構成で、再起動から通常運転までに要する時間を短縮することができる。なお、本発明では、一方の空気分離装置の再起動時には、他の空気分離装置に貯留されている液体酸素および液体窒素を任意の量（例えば、全量）だけ移せばよいので、簡単な制御を追加するだけで、再起動から通常運転までに要する時間を短縮することができる。   In the present invention, when the liquid oxygen supply pipe 13 and the liquid nitrogen supply pipe 14 are installed and one of the air separation devices is restarted, the liquid oxygen and the liquid nitrogen are supplied from the other air separation device. With a simple configuration, the time required from restart to normal operation can be shortened. In the present invention, when one of the air separation devices is restarted, liquid oxygen and liquid nitrogen stored in the other air separation device need only be transferred by an arbitrary amount (for example, the total amount), so that simple control is possible. The time required from the restart to the normal operation can be shortened only by adding.

本発明に係る本発明の実施の形態に係る空気分離設備の運転方法は、図１に示すような設備を用い、液体酸素供給管１３および液体窒素供給管１４を介して液体酸素および液体窒素を供給してもよいが、空気分離装置１１と空気分離装置１２とが離れた位置にあり、液体酸素供給管１３および液体窒素供給管１４を設置することが困難な場合には、停止する空気分離装置から取り出した液体酸素および液体窒素をタンクローリーで他方の起動する空気分離装置に運び、この空気分離装置に供給するようにしてもよい。   The operation method of the air separation facility according to the embodiment of the present invention uses the facility as shown in FIG. 1 and supplies liquid oxygen and liquid nitrogen through the liquid oxygen supply pipe 13 and the liquid nitrogen supply pipe 14. The air separation device 11 may be supplied, but if the air separation device 11 and the air separation device 12 are at a distance from each other and it is difficult to install the liquid oxygen supply pipe 13 and the liquid nitrogen supply pipe 14, the air separation to be stopped. The liquid oxygen and liquid nitrogen taken out from the apparatus may be transported to the other activated air separation apparatus by a tank lorry and supplied to the air separation apparatus.

なお、点検を行うために停止する空気分離装置では、主凝縮器に貯留されている液体酸素や液体窒素が排出されて処分されるため、本発明では、この停止を行う際に排出された液体酸素や液体窒素を利用する。これにより、処分される液体酸素や液体窒素を有効利用し、通常運転までに要するエネルギーコストを低減することができる。   In the air separation device that is stopped for inspection, the liquid oxygen and liquid nitrogen stored in the main condenser are discharged and disposed of. Therefore, in the present invention, the liquid discharged when the stop is performed. Use oxygen or liquid nitrogen. Thereby, the liquid oxygen and liquid nitrogen to be disposed of can be effectively used, and the energy cost required for normal operation can be reduced.

また、上述では、２つの空気分離装置を備えた空気分離設備について説明したが、本発明は、３以上の空気分離装置を備えた空気分離設備にも適用できる。この場合には、再起動を行う一の空気分離装置の主凝縮器に、これから停止を行う他の少なくとも１つの空気分離装置の主凝縮器に供給するように構成すればよい。   Moreover, although the air separation installation provided with two air separation apparatuses was demonstrated in the above-mentioned, this invention is applicable also to the air separation installation provided with the 3 or more air separation apparatus. In this case, what is necessary is just to comprise so that it may supply to the main condenser of the other air separation apparatus which stops from now on to the main condenser of one air separation apparatus which restarts.

１１ 空気分離装置
１１０ 空気圧縮器
１１１ 熱交換器
１１２ 精留塔
１１２ａ 上塔
１１２ｂ 下塔
１１２ｃ 主凝縮器
１２ 空気分離装置
１２０ 空気圧縮器
１２１ 熱交換器
１２２ 精留塔
１２２ａ 上塔
１２２ｂ 下塔
１２２ｃ 主凝縮器
１３ 液体酸素供給管
１４ 液体窒素供給管 11 Air Separator 110 Air Compressor 111 Heat Exchanger 112 Rectifying Tower 112a Upper Tower 112b Lower Tower 112c Main Condenser 12 Air Separator 120 Air Compressor 121 Heat Exchanger 122 Rectifying Tower 122a Upper Tower 122b Lower Tower 122c Main Condenser 13 Liquid oxygen supply pipe 14 Liquid nitrogen supply pipe

Claims (2)

上塔、下塔および主凝縮器を有し原料空気より窒素および酸素を精留分離する精留塔が設けられた複数の空気分離装置を備えた空気分離設備であって、
一の空気分離装置の主凝縮器に設けられた液体酸素の貯留部と、他の少なくとも１つの空気分離装置の主凝縮器に設けられた液体酸素の貯留部とを接続する液体酸素供給管と、
一の空気分離装置の主凝縮器に設けられた液体窒素の貯留部と、他の少なくとも１つの空気分離装置の主凝縮器に設けられた液体窒素の貯留部とを接続する液体窒素供給管とを有する空気分離設備。 An air separation facility comprising a plurality of air separation devices having an upper tower, a lower tower and a main condenser, and provided with a rectifying tower for rectifying and separating nitrogen and oxygen from raw air,
A liquid oxygen supply pipe for connecting a liquid oxygen storage section provided in a main condenser of one air separation device and a liquid oxygen storage section provided in a main condenser of at least one other air separation device; ,
A liquid nitrogen supply pipe connecting a liquid nitrogen storage section provided in a main condenser of one air separation device and a liquid nitrogen storage section provided in a main condenser of at least one other air separation device; Having air separation equipment. 上塔、下塔および主凝縮器を有し原料空気より窒素および酸素を精留分離する精留塔が設けられた複数の空気分離装置を備えた空気分離設備の運転方法であって、
一の空気分離装置を起動する際に、これから停止を行う他の少なくとも１つの空気分離装置の主凝縮器に貯留された液体酸素および液体窒素を、起動する一の空気分離装置の主凝集器の液体酸素および液体窒素が貯留される部分にそれぞれ供給する空気分離設備の運転方法。 An operation method of an air separation facility comprising a plurality of air separation devices provided with a rectifying tower having an upper tower, a lower tower and a main condenser and rectifying and separating nitrogen and oxygen from raw air,
When starting one air separation device, the liquid oxygen and the liquid nitrogen stored in the main condenser of at least one other air separation device to be stopped from now on are used for the main aggregator of the one air separation device to be started. A method of operating an air separation facility that supplies liquid oxygen and liquid nitrogen to the respective portions.
JP2015123831A 2015-06-19 2015-06-19 Air separation facility and its operational method Pending JP2017009166A (en)

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