KR20030068800A - Method of nitrogen gas manufacture using an air separator in the type of sub-zero - Google Patents

Method of nitrogen gas manufacture using an air separator in the type of sub-zero Download PDF

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KR20030068800A
KR20030068800A KR1020020008421A KR20020008421A KR20030068800A KR 20030068800 A KR20030068800 A KR 20030068800A KR 1020020008421 A KR1020020008421 A KR 1020020008421A KR 20020008421 A KR20020008421 A KR 20020008421A KR 20030068800 A KR20030068800 A KR 20030068800A
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liquid
level
air
nitrogen
state
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KR1020020008421A
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Korean (ko)
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KR100454810B1 (en
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문흥만
용평순
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대성산소 주식회사
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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
    • 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
    • F25J3/04793—Rectification, e.g. columns; Reboiler-condenser
    • 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
    • F25J3/04254—Generation of cold for compensating heat leaks or liquid production, e.g. by Joule-Thompson expansion using the cold stored in external cryogenic fluids
    • 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
    • F25J3/044—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 single pressure main column system only
    • 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
    • F25J3/04854—Safety aspects of operation
    • F25J3/0486—Safety aspects of operation of vaporisers for oxygen enriched liquids, e.g. purging of liquids
    • 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
    • F25J3/0489—Modularity and arrangement of parts of the air fractionation unit, in particular of the cold box, e.g. pre-fabrication, assembling and erection, dimensions, horizontal layout "plot"
    • 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
    • F25J2200/00—Processes or apparatus using separation by rectification
    • F25J2200/72—Refluxing the column with at least a part of the totally condensed overhead gas
    • 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
    • F25J2210/00—Processes characterised by the type or other details of the feed stream
    • F25J2210/42—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
    • F25J2250/00—Details related to the use of reboiler-condensers
    • F25J2250/30—External or auxiliary boiler-condenser in general, e.g. without a specified fluid or one fluid is not a primary air component or an intermediate fluid
    • F25J2250/42—One 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
    • F25J2250/00—Details related to the use of reboiler-condensers
    • F25J2250/30—External or auxiliary boiler-condenser in general, e.g. without a specified fluid or one fluid is not a primary air component or an intermediate fluid
    • F25J2250/52—One fluid being oxygen enriched compared to air, e.g. "crude oxygen"

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  • 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

PURPOSE: A method for generating nitrogen gas using cryogenic air separation unit is provided to maintain level of liquid surface of liquid-air separator or rectifying column to a certain level by sensing the elevation of liquid surface of the liquid-air separator and rectifying column and controlling supply of liquid nitrogen or liquid air. CONSTITUTION: The method for generating nitrogen gas using cryogenic air separation unit comprises the liquid nitrogen gas supply control process comprising a step of sensing level of liquid surface of liquid air of rectifying column(10) using first liquid surface meter(24), and a step of outputting low liquid surface signal if the level of the liquid surface is less than a certain level and opening the automatic valve so that liquid nitrogen is supplied to the rectifying column from liquid nitrogen storage tank(22) if the automatic valve is in the closed state by checking the state of automatic valve(19), and outputting high liquid surface signal if the level of the liquid surface is the same as or higher than a certain level and closing the automatic valve, thereby stopping supply of liquid nitrogen to the rectifying column from liquid nitrogen storage tank so that the level of liquid surface of the liquid air of the rectifying column is recovered to a certain level if the automatic valve is in the opened state by checking the state of the automatic valve; and the liquid air supply control process comprising a step of sensing elevation of liquid surface of liquid air of liquid-air separator(12) using second liquid surface meter(25), and a step of outputting low liquid surface signal if the elevation of the liquid surface is less than a certain level and opening the expansion valve so that liquid air is supplied to the liquid-air separator from the rectifying column if the expansion valve is in the closed state by checking the state of expansion valve(11), and outputting high liquid surface signal if the elevation of the liquid surface is the same as or higher than a certain level and closing the expansion valve, thereby stopping supply of liquid air to the liquid-air separator(12) from a lower region of the rectifying column so that the elevation of liquid surface of the liquid air is recovered to a certain level if the expansion valve is in the opened state by checking the state of the expansion valve.

Description

심랭식 공기분리장치에 의한 질소가스 제조 방법{Method of nitrogen gas manufacture using an air separator in the type of sub-zero}Method of manufacturing nitrogen gas by a deep-cooled air separator {Method of nitrogen gas manufacture using an air separator in the type of sub-zero}

본 발명은 심랭식 공기분리장치에 의한 질소가스 제조 방법에 관한 것으로서, 보다 상세하게는 액체공기 분리기 및 정류탑 장치 각각의 액면의 고저를 감지하고, 감지된 결과를 이용하여 액체질소 또는 액체공기의 수급을 조절하여 액체공기 분리기 또는 정류탑의 액면의 고저를 일정 수준으로 유지하도록 하는 심랭식 공기분리장치에 의한 질소가스 제조 방법에 관한 것이다.The present invention relates to a method for producing nitrogen gas by a deep-cooled air separation apparatus, and more particularly, to detect the level of the liquid level of each of the liquid air separator and the rectifier tower device, and to detect liquid nitrogen or liquid air using the detected result. It relates to a nitrogen gas production method by a deep-cooled air separation device to adjust the supply and demand to maintain the level of the liquid level of the liquid air separator or rectification tower at a constant level.

종래의 공기 분리 방법에 있어서, 심랭분리법은 공기를 고압 및 저온 상태에서 분리하는 방법으로서 고순도의 산소, 질소 및 아르곤 등을 분리해 낼 수 있어 효율이 매우 좋을 뿐만 아니라, 크립톤(Kr), 크세논(Xeon) 및 네온(Neon)과 같은 희가스도 분리해 낼 수 있어 현재 공기분리기술의 주류를 이루고 있다.In the conventional air separation method, the deep cooling method is a method of separating air at high pressure and low temperature to separate high purity oxygen, nitrogen, argon, etc., and the efficiency is very good, and krypton (Kr), xenon ( Rare gases such as Xeon and Neon can also be separated, making it the mainstream air separation technology.

상기한 종래 기술에 있어서, 저온의 상태를 만들어주기 위해 한랭원을 공급하는 것이 필수적이며, 상기 한랭원을 공급하는 방법으로는 팽창 터빈을 사용하여 자체적으로 공급하는 방법과 외부로부터 액체질소를 공급받는 방법이 있다.In the above prior art, it is essential to supply a cold source to create a low temperature state, and the method of supplying the cold source is a method of supplying itself by using an expansion turbine and receiving liquid nitrogen from the outside. There is a way.

상기 팽창 터빈을 사용하는 방법은 자체적으로 한랭원을 발생하여 공급하는 것이 가능하다는 장점이 있으나 반면에, 장치의 구성이 복잡하고 운전이 까다롭다는 단점이 있었다. 따라서 외부로부터 액체질소를 공급받는 방법이 장치가 간단하고 운전이 쉽다는 장점때문에 많이 사용되었다.The method of using the expansion turbine has the advantage that it is possible to generate and supply a cold source by itself, on the other hand, there is a disadvantage that the configuration of the device is complicated and difficult to operate. Therefore, the method of receiving liquid nitrogen from the outside has been widely used because of the advantages of the simple device and easy operation.

이와 같이 외부로부터 액체질소를 공급받는 방법에 있어서, 장치의 구성 요소 중에서 액체공기 분리기와 정류탑은 일정 수준의 액체 공기를 저장하고 있는 것 즉, 일정한 수준의 액면의 고저를 유지하는 것이 중요하다. 이는 액체공기 분리기에 있어서, 액체공기의 액면의 고저에 따라 그 안에 내장된 응축기의 열교환량이 달라져 정류 공정에 영향을 미치기 때문이며, 정류탑에 있어서는 액체공기의 액면이 일정 수준 이상인 경우에는 액체공기가 정류탑 내부의 충전물까지 올라가 정류효율이 저하되고, 일정 수준 미만인 경우에는 액체공기 분리기로 이송되는 액체공기의 양이 줄어들어 정류가 불가능해지기 때문이다.In such a method of receiving liquid nitrogen from the outside, it is important that the liquid air separator and the rectifier column of the components of the apparatus store a certain level of liquid air, that is, maintain a constant level of liquid level. This is because in the liquid air separator, the heat exchange amount of the condenser embedded in the liquid air varies depending on the height of the liquid level, which affects the rectifying process. This is because the rectification efficiency is lowered up to the filling inside the tower, and when it is below a certain level, the amount of liquid air transferred to the liquid air separator is reduced, which makes it impossible to rectify.

종래 기술에 의한 액체공기 분리기는 액체질소 저장탱크로부터 공급되는 액체질소의 양을 조절하여 액면의 고저를 일정 수준으로 유지하였다. 또한, 정류탑은 정류탑의 액면의 고저와 무관하게 팽창 밸브의 개도를 일정하게 유지하거나 액면계를 설치하여 액면계가 액면의 고저를 판단하고 그에 대응하는 신호를 출력하여 팽창 밸브의 개도를 조절함으로써 액체공기 분리기에 액체공기를 공급해 왔다.The liquid air separator according to the prior art maintains the level of the liquid level at a constant level by controlling the amount of liquid nitrogen supplied from the liquid nitrogen storage tank. In addition, the rectifier tower maintains a constant opening degree of the expansion valve irrespective of the elevation of the liquid level of the rectification tower, or installs a liquid level gauge so that the liquid level determines the height of the liquid level and outputs a corresponding signal to adjust the opening degree of the expansion valve. Liquid air has been supplied to the air separator.

예컨대, 외부의 요인으로 원료 공기의 열량이 증가하여 정류탑의 액면의 고저가 일정 수준 이상 낮아진 경우에는 정류탑으로부터 액체공기 분리기로 이송되는 액체공기의 양이 연쇄적으로 감소하고, 따라서, 액체공기 분리기의 액면의 고저가 일정 수준 이상 낮아지고, 마지막으로, 자동 밸브가 오픈되어 액체질소가 투입되는 방법으로 액체공기 분리기 및 정류탑의 액면의 고저가 유지되었다.For example, when the calorific value of the raw material air is increased due to external factors and the height of the liquid level of the rectifying tower is lowered by a certain level or more, the amount of liquid air transferred from the rectifying tower to the liquid air separator is serially reduced. The bottom of the liquid level of the separator was lowered by a certain level or more, and finally, the level of the liquid level of the liquid air separator and the rectifying tower was maintained in such a manner that the automatic valve was opened to introduce liquid nitrogen.

상기한 바와 같은 액면 유지 방법은 원료로서 유입되는 공기의 열량 상태나유량이 바뀌는 경우에 일정 수준의 액면의 고저를 유지하기 위해 적절하게 대응하는 것이 어렵고, 또한, 장치가 정상 상태를 유지하는데 시간이 소요된다는 단점이 있었다. 특히, 정류탑 내의 홀드업(hold up)이 적은 규칙 충전탑(structured packing)에서는 외부의 요인에 의한 공기의 상태 변화에 즉각적인 대응을 할 수 있는 새로운 액면 유지 방법이 요망되었다.As described above, the liquid level holding method is difficult to properly respond to maintain a certain level of liquid level when the calorie state or flow rate of the air flowing into the raw material is changed, and the time required for the device to maintain a steady state is also high. It was a disadvantage. In particular, in a structured packing having a low hold up in the rectifier tower, a new liquid level retention method that can respond immediately to a change in air condition caused by external factors has been desired.

본 발명은 상기한 바와 같은 문제점을 해결하기 위한 것으로서, 외부의 요인에 의한 변화가 생하여 원료 공기의 열량이 변하고, 그로 인해 액체공기 분리기 또는 정류탑의 액면의 고저에 일정 수준 이상의 변화가 생기는 경우에 액면의 고저의 변화를 감지하고, 그에 대응하는 신호를 출력하여 신속하고 효과적으로 액체질소 또는 액체공기의 수급을 조절하므로써 액면의 고저를 일정 수준으로 유지하여 고순도의 질소가스를 제조하는 심랭식 공기분리장치에 의한 질소가스 제조 방법을 제공하는 것을 목적으로 한다.The present invention is to solve the problems as described above, when the change caused by the external factors occurs, the amount of heat of the raw air changes, thereby causing a change of a certain level or more at the bottom of the liquid surface of the liquid air separator or rectification column Depth-cooled air separation that detects changes in the level of the liquid level and outputs a corresponding signal to control the supply and demand of liquid nitrogen or liquid air quickly and effectively to maintain the level of the liquid level at a constant level to produce high purity nitrogen gas It is an object to provide a method for producing nitrogen gas by means of an apparatus.

도 1은 본 발명이 구현되는 장치 구성 및 공정 흐름을 나타내는 도면,1 is a view showing the device configuration and process flow in which the present invention is implemented,

도 2는 본 발명에 있어서 액체질소의 공급 규제를 나타내는 흐름도,2 is a flowchart showing regulation of supply of liquid nitrogen in the present invention;

도 3은 본 발명에 있어서 액체공기의 공급 규제를 나타내는 흐름도.3 is a flow chart showing supply regulation of liquid air in the present invention.

<도면의 주요 부분에 대한 부호의 설명><Explanation of symbols for the main parts of the drawings>

1...공기 공급배관, 2...필터,1 ... air supply piping, 2 ... filter,

3...압축기, 4...냉동기,3 ... compressor, 4 ... freezer,

5...기액 분리기, 6...흡착탑,5 ... gas separator, 6 ... adsorption tower,

7...전기 히터, 8...주 열교환기,7 ... electric heater, 8 ... main heat exchanger,

9...정류탑 입구배관, 10...정류탑,9 rectifier tower inlet, 10 rectifier tower,

11...팽창 밸브, 12...액체공기 분리기,11 ... expansion valve, 12 ... liquid air separator,

13...질소 응축기, 14...희가스 배관,13 nitrogen condenser, 14 rare gas piping,

15...폐열 회수배관, 16...액체공기 열교환기,15 ... waste heat recovery piping, 16 ... liquid air heat exchanger,

17...액체공기 배출배관, 18...액체질소 공급배관,17.Liquid air discharge piping, 18.Liquid nitrogen supply piping,

19...자동 밸브, 20...질소가스 배관,19 ... automatic valves, 20 ... nitrogen gas piping,

21...폐가스 배관, 22...액체질소 저장탱크,21 waste gas piping, 22 liquid nitrogen storage tanks,

23...콜드 박스, 24...제1액면계,23 ... cold box, 24 ... the first level gauge,

25...제2액면계.25.Second level gauge.

상기한 목적을 달성하기 위하여 본 발명은 심랭식 공기분리장치에 의한 질소가스 제조 방법에 있어서, 액체질소의 공급을 규제함에 있어서, 제1액면계가 정류탑 액체공기의 액면의 고저를 감지하는 단계와, 액면의 고저가 일정 수준 미만이면 저액면 신호를 출력하고, 이어서, 자동 밸브의 상태를 체크하여 클로즈 상태인 경우에는 오픈하여 액체질소 저장탱크로부터 정류탑측으로 액체질소가 공급되고, 액면의 고저가 일정 수준 이상이면 고액면 신호를 출력하고, 이어서, 자동 밸브의 상태를 체크하여 오픈 상태인 경우에는 클로즈하여 액체질소 저장탱크로부터 정류탑측으로 액체질소의 공급이 중단되어 정류탑 액체공기의 액면의 고저가 일정 수준으로 회복되는 단계를 포함하여 구성되며, 액체공기의 공급을 규제함에 있어서, 제2액면계가 액체공기 분리기의 액체공기의 액면의 고저를 감지하는 단계와 액면의 고저가 일정 수준 미만이면 저액면 신호를 출력하고, 이어서, 팽창 밸브의 상태를 체크하여 클로즈 상태인 경우에는 오픈하여 정류탑으로부터 액체공기 분리기측으로 액체공기가 공급되고, 액면의 고저가 일정 수준 이상이면 고액면 신호를 출력하고, 이어서, 팽창 밸브의 상태를 체크하여 오픈 상태인 경우에는 클로즈하여 정류탑의 하부 영역으로부터 액체공기 분리기측으로 액체공기의 공급이 중단되어 액체공기의 액면의 고저가 일정 수준으로 회복되는 단계를 포함하여 구성되는 것을 특징으로 한다.In order to achieve the above object, the present invention provides a method for producing nitrogen gas by a deep-cooling air separation device, in the step of regulating the supply of liquid nitrogen, the first liquid level of the liquid level of the rectifier tower liquid air and If the level of the liquid level is less than a certain level, the low level signal is output. Then, the state of the automatic valve is checked and opened in the closed state, whereby liquid nitrogen is supplied from the liquid nitrogen storage tank to the rectifier column. If it is above a certain level, it outputs a high liquid level signal, then checks the state of the automatic valve and closes it in the open state, and stops supply of liquid nitrogen from the liquid nitrogen storage tank to the rectifying tower side, thereby raising the level of liquid level in the rectifying tower liquid air. Is recovered to a certain level, and in regulating the supply of liquid air, the second liquid level gauge Detecting the level of the liquid level of the liquid air of the separator and outputting a low level signal when the level of the liquid level is less than a predetermined level, and then checking the state of the expansion valve and opening it in the closed state to open the liquid air separator from the rectifying tower. If the liquid air is supplied to the side and the level of the liquid level is higher than or equal to a predetermined level, a high liquid level signal is output. Then, the state of the expansion valve is checked and closed in the open state. It is characterized in that it is configured to include the step of restoring the supply of the liquid level of the liquid level of the liquid air to a certain level.

이하, 첨부된 도면을 참조하여 본 발명에 의한 실시예를 상세하게 설명한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

도 1은 본 발명에 의한 제조방법이 구현되는 장치 구성 및 공정 흐름을 나타내는 도면이다.1 is a view showing the device configuration and process flow in which the manufacturing method according to the present invention is implemented.

도면에서 도시하고 있는 바와 같이, 본 발명이 구현되는 장치는 상온부와 저온부로 대별되어 설치된다.As shown in the figure, the apparatus in which the present invention is implemented is roughly installed into a room temperature part and a low temperature part.

상기 상온부는 예비-정제 유니트로서, 원료 공기 공급배관(1), 필터(2), 원료공기를 압축시키는 압축기(3), 원료 공기의 온도를 낮추는 냉동기(4), 기액 분리기(5), 공기 중의 수분(H2O)과 이산화탄소(CO2)를 제거하는 흡착탑(6) 2개가 한조가되어 구성되며, 상기 흡착탑(6)의 온도를 상승시키는 전기 히터(7) 등으로 구성된다.The room temperature unit is a pre-purification unit, the raw material air supply pipe (1), the filter (2), the compressor (3) for compressing the raw air, the freezer (4) to lower the temperature of the raw air, gas-liquid separator (5), air Two adsorption towers 6 for removing the water (H 2 O) and carbon dioxide (CO 2 ) in the tank are composed of a pair, and the electric heater (7) for raising the temperature of the adsorption tower (6).

상기 저온부는 공기 분리 유니트로서, 주 열교환기(8), 액체-증기 접촉 요소인 다공질 또는 규칙적 충전물(structured packing)로 채워져 있으며, 액체공기의 액면의 고저가 일정한 수준으로 유지되는 정류탑(10), 팽창 밸브(11), 상기 팽창 밸브(11)의 제어를 통해 액체공기의 액면의 고저가 일정한 수준으로 유지되는 액체공기 분리기(12), 압력이 비교적 낮은 상태를 유지하며, 질소가스가 응축되는 질소 응축기(13), 건조공기와 액체공기와 희가스가 서로 열교환하는 액체공기 열교환기(16), 상기 정류탑(10)과 연통하는 자동 밸브(19), 상기 정류탑(10)의 액면을 감지하며 상기 자동밸브와 연통하는 제1액면계(24) 및 상기 액체공기 열교환기(16)의 액면을 감지하며 상기 팽창 밸브(11)와 연통하는 제2액면계(25) 등으로 구성되며, 상기한 구성 요소의 하우징인 콜드박스(23)라는 단열 상자를 구비한다.The low temperature section is an air separation unit, which is filled with a main heat exchanger (8), a porous or structured packing that is a liquid-vapor contact element, and a rectification column (10) in which the level of the liquid surface of liquid air is maintained at a constant level. , The expansion valve 11, the liquid air separator 12 in which the level of the liquid surface of the liquid air is maintained at a constant level through the control of the expansion valve 11, maintains a relatively low pressure, and the nitrogen gas is condensed. A nitrogen condenser 13, a liquid air heat exchanger 16 in which dry air, liquid air and rare gas exchange with each other, an automatic valve 19 communicating with the rectifying tower 10, and a liquid level of the rectifying tower 10 is sensed. And a second liquid level gauge 25, which detects the liquid level of the first liquid level gauge 24 and the liquid air heat exchanger 16, which is in communication with the automatic valve, and is in communication with the expansion valve 11. Cold box (23), the housing of the elements It is equipped with a thermal insulation box called.

미설명 부호 9는 정류탑 입구배관, 부호 14는 희가스 배관, 부호 15는 폐열 회수배관, 부호 17은 액체공기 배출배관, 부호 18은 액체질소 공급배관, 부호 20은 질소가스 배관, 부호 21은 폐가스 배관, 부호 22는 상기 자동 밸브(19)의 제어를 통해 상기 정류탑(10)에 한랭원인 액체질소를 공급하는 액체질소 저장탱크를 나타낸다.Description 9 is a rectifier tower inlet pipe, 14 is a rare gas pipe, 15 is waste heat recovery pipe, 17 is liquid air discharge pipe, 18 is liquid nitrogen supply pipe, 20 is nitrogen gas pipe, 21 is waste gas The pipe 22 denotes a liquid nitrogen storage tank for supplying liquid nitrogen, which is a cold source, to the rectifying tower 10 through the control of the automatic valve 19.

도시한 바와 같이, 상기 콜드 박스(23)의 내부에는 상기 주 열교환기(8)가 상기 상온부와 근접한 부분에 위치하고, 상기 액체공기 분리기(12)는 최상부 영역에 위치하며, 상기 정류탑(10)은 하부 영역으로서 상기 액체공기 분리기(12)의 하면에 인접하여 설치되고, 상기 액체공기 열교환기(16)는 하부 영역으로서 상기 정류탑(10)의 측면에 인접하여 설치된다.As shown, inside the cold box 23, the main heat exchanger 8 is located at a portion close to the room temperature portion, the liquid air separator 12 is located at the uppermost region, and the rectification column 10 ) Is provided as a lower region adjacent to the lower surface of the liquid air separator 12, and the liquid air heat exchanger 16 is installed adjacent to the side of the rectifying tower 10 as a lower region.

이하, 도 1을 참조하면서 본 발명에 의한 질소가스의 제조방법을 상세하게 설명한다.Hereinafter, the manufacturing method of nitrogen gas by this invention is demonstrated in detail, referring FIG.

우선, 질소가스를 획득하는 원료 공기가 대기로부터 원료 공기 공급배관(1)을 통해 공급되고, 공급된 원료 공기는 필터(2)를 통과하면서 함유되어 있는 분진 입자와 같은 불순물이 제거되며, 상기 압축기(3)는 후공정을 수행하는데 필요로 하는 정도의 적당한 압력으로 상승되도록 공기를 압축한다. 이 때, 공기를 압축하는 과정에서 열이 발생하며, 이 때 발생된 열 즉, 압축열은 냉각수에 의하여 제거된다.First, the source air to obtain nitrogen gas is supplied from the atmosphere through the source air supply pipe 1, the supplied source air is removed impurities such as dust particles contained while passing through the filter 2, the compressor (3) compresses the air so that it rises to an appropriate pressure necessary to carry out the post-process. At this time, heat is generated in the process of compressing air, and the heat generated at this time, that is, the heat of compression, is removed by the cooling water.

이어서, 상기 냉동기(4)가 압축된 공기를 냉각시키고, 기액 분리기(5)가 냉각된 공기 중의 수분을 응축 및 제거하며, 흡착탑(6)이 압력과 온도를 변화시켜 탈수된 공기에서 비교적 낮은 휘발성을 갖는 잔류 수분 및 이산화탄소 등을 흡착제거해 건조시킨다. 이는 수분이나 이산화탄소 등이 미량이라도 잔류하는 경우 저온에서는 고체 상태로 존재하게 되므로 장치에 나쁜 영향을 미치기 때문이다. 이때 흡착탑(6)은 전기 히터(7)에 의해 온도가 상승된다.Subsequently, the refrigerator 4 cools the compressed air, the gas-liquid separator 5 condenses and removes moisture in the cooled air, and the adsorption tower 6 changes the pressure and temperature to relatively low volatility in the dehydrated air. Adsorption removes residual moisture and carbon dioxide and the like to dry. This is because even if a small amount of moisture or carbon dioxide is left in a solid state at low temperatures, it has a bad effect on the device. At this time, the temperature of the adsorption tower 6 is increased by the electric heater (7).

상기와 같이 건조된 공기는 그 일부가 주 열교환기(8)로 도입되고, 다른 일부는 폐열 회수배관(15)을 통하여 액체공기 열교환기(16)로 도입된다.The air dried as described above is partially introduced into the main heat exchanger 8, and the other part is introduced into the liquid air heat exchanger 16 through the waste heat recovery pipe 15.

계속해서, 주 열교환기(8)는 건조된 공기를 정류하기에 적합한 온도(통상적으로 공기의 이슬점 또는 그 부근의 온도)로 냉각시켜 정류탑 입구배관(9)을 통하여 정류탑(10)으로 전달한다.Subsequently, the main heat exchanger (8) is cooled to a temperature suitable for rectifying the dried air (typically the temperature at or near the dew point of the air) and transferred to the rectification tower (10) via the rectifier tower inlet (9). do.

냉각된 건조 공기를 전달받은 정류탑(10)에서는 한랭원인 액체질소의 작용으로 물질 이동이 일어나서 정류탑(10) 상부 영역에는 탑상물로서 가벼운 질소 가스가 수거되고, 하부 영역에는 탑저물로서 산소 성분이 풍부한 액체공기가 수거되는 분리 공정이 이루어진다. 이 때, 상기 분리 공정은 정류탑(10) 하부 영역의 액체공기의 액면이 일정 수준 미만로 감소하거나 증가한 경우에는 소정의 방법을 통해 액체질소의 수급을 제어하여 일정 수준의 액체 공기의 액면의 고저를 유지한 후에 이루어진다. 상기 소정의 방법에 대해서는 후술한다.In the rectification tower 10 receiving the cooled dry air, material movement occurs due to the action of liquid nitrogen, which is a cold source, so that light nitrogen gas is collected in the upper region of the rectification column 10 as a tower material, and an oxygen component in the lower region as a tower bottom. A separation process takes place where this rich liquid air is collected. At this time, in the separation process, when the liquid level of the liquid air in the lower portion of the rectification column 10 decreases or increases below a predetermined level, the supply and demand of liquid nitrogen is controlled by a predetermined method to raise the level of the liquid level of the liquid air. It takes place after maintaining. The predetermined method will be described later.

상기한 바와 같은 과정을 통하여, 정류탑(10) 상부 영역의 질소 가스는 주 열교환기(8)를 거쳐 질소가스 배관(20)을 통해 외부로 배출되어 제품으로 회수되고, 일부 질소 가스는 추출되어 액체공기 분리기(12)에 도입되며, 하부 영역의 액체 공기는 팽창 밸브(11)를 통과함과 동시에 저압으로 떨어진 상태로 액체공기 분리기(12)에 도입된다.Through the process as described above, the nitrogen gas in the upper region of the rectification tower 10 is discharged to the outside through the nitrogen gas pipe 20 through the main heat exchanger (8) to be recovered as a product, and some nitrogen gas is extracted The liquid air separator 12 is introduced into the liquid air separator 12, and the liquid air in the lower region is introduced into the liquid air separator 12 in a state of being separated at low pressure while passing through the expansion valve 11.

이어서, 액체공기 분리기(12) 내부의 질소 응축기(13)가 저장되어 있는 액체공기를 이용하여 정류탑(10) 상부 영역에서 수거되어 도입된 질소 가스를 응축시켜 액체 질소를 생성하고, 상기 액체 질소는 환류액으로서 회수하여 정류탑(10)의 상부 영역으로 보낸다. 이 때, 상기 응축 공정은 액체공기 분리기(12)의 액체공기의 액면이 일정 수준 미만로 감소하거나 증가한 경우에는 소정의 방법을 통해 액체공기의 수급을 제어하여 일정 수준의 액면의 고저를 유지한 후에 이루어진다. 상기 소정의 방법에 대해서는 후술한다.Subsequently, by using the liquid air in which the nitrogen condenser 13 inside the liquid air separator 12 is stored, the nitrogen gas collected and collected in the upper region of the rectification column 10 is condensed to generate liquid nitrogen, and the liquid nitrogen Is recovered as reflux and sent to the upper region of the tower 10. At this time, in the condensation process, when the liquid level of the liquid air of the liquid air separator 12 decreases or increases below a predetermined level, the supply and demand of the liquid air is controlled by a predetermined method to maintain the level of the liquid level. Is done. The predetermined method will be described later.

상기 액체질소를 생성하는 과정에 사용된 액체공기는 폐가스 배관(21)을 통해 외부로 배출된다.Liquid air used in the process of producing the liquid nitrogen is discharged to the outside through the waste gas pipe (21).

상기 액체 질소를 만드는 과정에서 희가스가 발생하게 되며, 발생된 희가스는 희가스 배관(14)을 통해 배출함으로써 질소 응축기(13) 전단에서 제거한다. 상기한 과정이 진행되는 동안에 액체공기 분리기(12)의 하부에 아세틸렌(C2H2)이 농축되어 폭발이 일어날 우려가 있으므로 액체공기 배출배관(17)을 통해 일정량의 액체공기를 배출시킨다.Rare gas is generated in the process of making the liquid nitrogen, the generated rare gas is removed from the front end of the nitrogen condenser 13 by discharging through the rare gas pipe (14). Since the acetylene (C 2 H 2 ) is concentrated in the lower portion of the liquid air separator 12 during the above-described process, there is a possibility that an explosion may occur, and a predetermined amount of liquid air is discharged through the liquid air discharge pipe 17.

상기 아세틸렌 농축에 의한 폭발 방지를 위하여 액체공기 분리기(12)로부터 배출된 액체공기 및 상기 희가스는 후술하는 바와 같이 액체공기 열교환기(16)를 통하여 회수된다. 즉, 액체공기 열교환기(16)는 상기 희가스, 회수된 액체공기 및 상기 흡착탑(6)에서의 폐열 회수배관(15)을 통해 공급받은 건조 공기 사이에 열교환을 시킨다. 상기 액체공기와 희가스는 상온의 가스가 되어 폐가스 배관(21)을 통해 대기로 방출된다.In order to prevent explosion due to the acetylene concentration, the liquid air discharged from the liquid air separator 12 and the rare gas are recovered through the liquid air heat exchanger 16 as described below. That is, the liquid air heat exchanger 16 exchanges heat between the rare gas, the recovered liquid air, and the dry air supplied through the waste heat recovery pipe 15 in the adsorption tower 6. The liquid air and the rare gas become gas at room temperature and are discharged to the atmosphere through the waste gas pipe 21.

본 발명에 있어서, 공기 분리 장치 중 저온부분은 콜드 박스(23) 내에 장착되므로 외부로부터 열침입을 차단할 수 있으며, 운전에 필요한 한랭은 액체질소 저장탱크(22)로부터 액체질소 공급배관(18)에 장착된 자동 밸브(19)를 통하여 공급받게 된다. 또한 상기 자동 밸브(19)는 정류탑(10) 하부의 제1액면계(24)의 신호에 따라 조작되고, 팽창 밸브(11)는 액체공기 분리기(12)에 장착된 제2액면계(25)의 신호에 의해 조작된다. 이에 대하여 아래에서 상세히 설명한다.In the present invention, since the low temperature portion of the air separation device is mounted in the cold box 23 can block the heat intrusion from the outside, the cold required for operation from the liquid nitrogen storage tank 22 to the liquid nitrogen supply pipe (18). It is supplied through the equipped automatic valve (19). In addition, the automatic valve 19 is operated according to the signal of the first liquid level gauge 24 under the rectification column 10, and the expansion valve 11 of the second liquid level gauge 25 mounted to the liquid air separator 12. Manipulated by a signal This will be described in detail below.

도 2는 본 발명에 있어서 액체질소의 공급 규제를 나타내는 흐름도이고, 도 3은 본 발명에 있어서 액체공기의 공급 규제를 나타내는 흐름도이다.FIG. 2 is a flowchart showing the supply regulation of liquid nitrogen in the present invention, and FIG. 3 is a flowchart showing the supply regulation of liquid air in the present invention.

도면에서 도시하고 있는 바와 같이, 본 발명에 의한 질소가스의 제조방법에 있어서, 상기 정류탑(10)에 의한 분리 공정 중 액면의 일정 수준 유지는, 제1액면계(24)가 정류탑(10)에 저장되어 있는 액체 공기의 액면의 고저가 일정 수준 미만로 낮아지거나 높아짐을 감지하여(N100), 액면의 고저가 일정 수준 미만라고 판단하면 그에 대응하는 저액면 신호를 출력하고(N200), 이어서, 자동 밸브(19)의 상태를 확인(N300)하여 클로즈 상태인 경우에는 자동 밸브(19)가 오픈되며(N400), 액체질소 저장탱크(22)로부터 정류탑(10)측으로 액체질소가 공급되어(N500) 액체공기의 액면의 고저가 일정 수준으로 유지된다.As shown in the figure, in the method for producing nitrogen gas according to the present invention, the first liquid level gauge 24 is the rectifier tower 10 to maintain a constant level of the liquid level during the separation process by the rectifying tower 10. When the height of the liquid level stored in the liquid level is detected to be lowered or raised below a certain level (N100), and when it is determined that the height of the liquid level is lower than a predetermined level, a low liquid level signal corresponding thereto is output (N200). When the state of the automatic valve 19 is checked (N300) and in the closed state, the automatic valve 19 is opened (N400), and liquid nitrogen is supplied from the liquid nitrogen storage tank 22 to the rectifying tower 10 side ( N500) The level of liquid level in liquid air is maintained at a certain level.

반대로, 액면의 고저가 일정수준 이상 즉, 과냉으로 판단되면 그에 대응하는 고액면 신호를 출력하고, 이어서(N210), 자동 밸브(19)의 상태가 체크(N310)되어 오픈 상태인 경우에는 자동 밸브(19)가 클로즈되고(N410), 액체질소 저장탱크(22)로부터 정류탑(10) 측으로 액체질소의 공급이 중단되어(N510) 액체공기의 액면의 고저가 일정 수준으로 유지된다.On the contrary, when the level of the liquid level is determined to be higher than a predetermined level, that is, overcooling, a high liquid level signal corresponding thereto is output (N210), and when the state of the automatic valve 19 is checked (N310), the automatic valve is opened. (19) is closed (N410), the supply of liquid nitrogen from the liquid nitrogen storage tank 22 to the rectifying tower 10 side is stopped (N510), and the level of the liquid level of the liquid air is maintained at a constant level.

본 발명에 의한 질소가스의 제조방법에 있어서, 상기 액체공기 분리기(12)에 의한 응축 공정 중 액면의 일정 수준 유지는, 제2액면계(25)가 액체공기 분리기(12) 내에 저장되어 있는 액체공기의 액면의 고저가 일정 수준 미만로 낮아지거나 일정 수준 이상으로 높아짐을 감지하여(S100), 액면의 고저가 일정 수준 이만이라고 판단하면 그에 대응하는 저액면 신호를 전달하고(S200), 이어서, 팽창 밸브(11)의 상태가 체크(S300)되어 클로즈 상태인 경우에는 팽창 밸브(11)가 오픈되고(S400), 정류탑(10) 하부 영역으로부터 팽창 밸브(11)를 통과하는 순간 저압으로 떨어진 액체공기가 액체공기분리기(12)측으로 공급(S500)되어 액체공기의 액면의 고저가 일정 수준으로 유지된다.In the method for producing nitrogen gas according to the present invention, the liquid level in which the second liquid level gauge 25 is stored in the liquid air separator 12 is maintained in the liquid level during the condensation process by the liquid air separator 12. When the height of the liquid level is detected to be lowered below a certain level or rises above a certain level (S100), and when the height of the liquid level is determined to be below a certain level, a low liquid level signal corresponding thereto is transmitted (S200), and then an expansion valve When the state of 11 is checked (S300) and is in a closed state, the expansion valve 11 is opened (S400), and the liquid air dropped to low pressure at the moment of passing through the expansion valve 11 from the lower portion of the rectification column 10. Is supplied to the liquid air separator 12 side (S500) to maintain the level of the liquid level of the liquid air at a certain level.

반대로, 액면의 고저가 일정 수준 이상 즉, 과냉으로 판단하면 그에 대응하는 고액면 신호를 전달하고(S210), 이어서, 팽창 밸브(11)의 상태가 체크되어(S310) 오픈 상태인 경우에는 클로즈되고(S410), 정류탑(10)의 하부 영역으로부터 액체공기 분리기(12)측으로 액체공기의 공급이 중단(S510)되어 액체공기의 액면의 고저가 일정 수준으로 유지된다.On the contrary, when the level of the liquid level is determined to be higher than or equal to a predetermined level, that is, supercooling, a high liquid level signal corresponding thereto is transmitted (S210), and then, when the state of the expansion valve 11 is checked (S310), the closed state is closed. (S410), the supply of the liquid air from the lower region of the rectifying column 10 to the liquid air separator 12 is stopped (S510) to maintain the level of the liquid level of the liquid air at a predetermined level.

상기한 바와 같은 본 발명에 의한 방법을 참조하여 액체질소를 투입하여 액면의 고저를 일정 수준으로 유지하는 방법의 일실시예를 설명한다.With reference to the method according to the present invention as described above one embodiment of a method for maintaining the level of the liquid level by introducing liquid nitrogen to a certain level.

외란으로 원료 공기의 열량이 증가하여 정류탑(10)의 액체공기의 액면의 고저가 일정 수준 미만로 낮아지면, 제1액면계(24)가 이를 감지하여 그에 대응하는 저액면 신호를 출력하고, 이어서, 자동 밸브(19)의 상태가 체크되어 클로즈 상태인 경우에는 오픈되게 되며, 액체질소 저장탱크(22)로부터 액체질소가 투입되어 액체공기의 액면의 고저가 일정 수준으로 유지된다. 따라서, 외란 발생에서 액체질소 투입에 이르기 까지의 경로가 단축되면서 전체적인 정류 공정이 신속하게 정상적으로 이루어진다.When the calorific value of the raw air is increased due to the disturbance and the height of the liquid level of the liquid air of the rectifying column 10 is lowered below a certain level, the first liquid level gauge 24 detects this and outputs a corresponding low level signal. When the state of the automatic valve 19 is checked and is in the closed state, the valve is opened and liquid nitrogen is introduced from the liquid nitrogen storage tank 22 to maintain the level of the liquid level of the liquid air at a constant level. Therefore, while the path from disturbance occurrence to the introduction of liquid nitrogen is shortened, the overall rectification process is quickly and normally performed.

본 발명에 의하면, 심랭식 공기분리장치에서 질소가스 제조 방법에 있어서,한랭원인 액체질소 또는 액체공기의 수급을 신속하고 효과적으로 조절하여 정류탑 및 액체공기 분리기의 액면의 고저를 일정 수준으로 유지함으로써 정류 공정이 정상적으로 이루어져 고순도의 질소가스를 획득할 수 있고 나아가, 외란에 대해 보다 빠르게 반응할 수 있어 장치가 단시간내에 정상 상태로 복귀함으로써 운전에 안정성이 증가될 수 있다.According to the present invention, in the method for producing nitrogen gas in a deep-cooled air separation device, the supply of liquid nitrogen or liquid air which is a cold source is controlled quickly and effectively to maintain rectification by maintaining the level of the liquid level of the rectifier tower and the liquid air separator at a constant level. The process can be performed normally to obtain high purity nitrogen gas, and furthermore, it can react more quickly to disturbances, thereby increasing stability in operation by returning the device to a steady state within a short time.

Claims (1)

심랭식 공기분리장치에 의한 질소가스 제조 방법에 있어서,In the nitrogen gas production method by a deep-cooling air separation device, 액체질소의 공급을 규제함에 있어서,In regulating the supply of liquid nitrogen, 제1액면계가 정류탑 액체공기의 액면의 고저를 감지하는 단계;Detecting, by the first liquid level gauge, the level of the liquid level of the rectifier tower liquid air; 액면의 고저가 일정 수준 미만이면 저액면 신호를 출력하고, 이어서, 자동 밸브의 상태를 체크하여 클로즈 상태인 경우에는 오픈하여 액체질소 저장탱크로부터 정류탑측으로 액체질소가 공급되고,When the level of the liquid level is lower than the predetermined level, a low liquid level signal is output. Then, the state of the automatic valve is checked and opened in the closed state, and liquid nitrogen is supplied from the liquid nitrogen storage tank to the rectifier column. 액면의 고저가 일정 수준 이상이면 고액면 신호를 출력하고, 이어서, 자동 밸브의 상태를 체크하여 오픈 상태인 경우에는 클로즈하여 액체질소 저장탱크로부터 정류탑측으로 액체질소의 공급이 중단되어 정류탑 액체공기의 액면의 고저가 일정 수준으로 회복되는 단계;If the level of the liquid level is above a certain level, a high liquid level signal is output. Then, the state of the automatic valve is checked, and if it is in an open state, the liquid level is closed and the supply of liquid nitrogen from the liquid nitrogen storage tank to the rectifier tower is stopped. Restoring the elevation of the face value to a certain level; 를 포함하여 구성되며,It is configured to include, 액체공기의 공급을 규제함에 있어서,In regulating the supply of liquid air, 제2액면계가 액체공기 분리기의 액체공기의 액면의 고저를 감지하는 단계;Sensing, by the second liquid level gauge, the level of the liquid level of the liquid air of the liquid air separator; 액면의 고저가 일정 수준 미만이면 저액면 신호를 출력하고, 이어서, 팽창 밸브의 상태를 체크하여 클로즈 상태인 경우에는 오픈하여 정류탑으로부터 액체공기 분리기측으로 액체공기가 공급되고,When the level of the liquid level is lower than the predetermined level, a low liquid level signal is output. Then, when the state of the expansion valve is checked and opened, the liquid level is opened to supply liquid air from the rectifying column to the liquid air separator. 액면의 고저가 일정 수준 이상이면 고액면 신호를 출력하고, 이어서, 팽창 밸브의 상태를 체크하여 오픈 상태인 경우에는 클로즈하여 정류탑의 하부 영역으로부터 액체공기 분리기측으로 액체공기의 공급이 중단되어 액체공기의 액면의 고저가 일정 수준으로 회복되는 단계;If the level of the liquid level is higher than a certain level, a high liquid level signal is output. Then, the state of the expansion valve is checked, and if it is open, the liquid level is closed. Restoring the elevation of the face value to a certain level; 를 포함하여 구성되는 것을 특징으로 하는 심랭식 공기분리장치에 의한 질소가스 제조 방법.Nitrogen gas production method by a deep-cooled air separation device, characterized in that comprising a.
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KR100964899B1 (en) * 2003-06-19 2010-06-23 주식회사 포스코 Liquid vaporizer with function to prevent back pressure
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CN105928319A (en) * 2016-05-13 2016-09-07 深圳市海格金谷化工科技有限公司 Cryogenic nitrogen generation control system

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