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Method and device for air separation

An air separation and air technology, applied in cold treatment separation, refrigeration and liquefaction, lighting and heating equipment, etc., can solve the problems of liquid nitrogen reduction, economical deterioration, and failure to reach users, and achieve power consumption reduction and performance The effect of price ratio optimization

Active Publication Date: 2008-07-09
SUZHOU XINGLU AIR SEPARATION PLANT SCI & TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the liquid nitrogen that is required to be extracted from the condensing evaporator between the two towers, when the amount of liquid nitrogen product supplied to the outside is increased, the amount of liquid nitrogen used as the reflux liquid of the upper tower will be correspondingly reduced
And when the liquid nitrogen supplied from outside increases to a certain amount, that is, when the amount of liquid nitrogen used as the reflux liquid of the upper tower is correspondingly reduced to a certain amount, the operating condition of the upper tower will deteriorate, and even affect the output of the rectifying tower. The quantity and quality of the product cannot meet the needs of users and make the economy worse
In some cases, even if the amount of liquid nitrogen required to be increased is not large, there will be some unsatisfactory places in the air expansion refrigeration process, which often leads to an increase in power consumption

Method used

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  • Method and device for air separation
  • Method and device for air separation

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Experimental program
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Embodiment 1

[0018] Embodiment 1 As shown in accompanying drawing 1, the raw material air 101 that is cooled in the pre-cooling system and removed in the purification system after the harmful impurities such as water vapor and carbon dioxide after being compressed by the compressor is used as the raw material air for separation, and it passes through the main heat exchange After device 5 is cooled to saturated temperature or partially band liquid, enters the lower tower 8 of rectification tower 7, rectification tower 7 is made up of lower tower 8, upper tower 9 and the condensing evaporator 10 between two towers. The raw material air 101 enters the bottom of the lower tower 8 and becomes the rising airflow of the lower tower 8, and fully contacts with the descending liquid flow on the tray to exchange heat and mass. The oxygen-enriched liquid air 102 containing more oxygen is obtained at the bottom of the lower tower 8 . After the oxygen-enriched liquid air 102 is led out of the lower towe...

Embodiment 2

[0022] Embodiment 2 As shown in Figure 2, in the same air separation method and device as Embodiment 1, in order to reduce the energy consumption of the product, a low-temperature precooler 15 is provided at an appropriate position of the main heat exchanger 5 . A low-temperature refrigeration unit 16 is used to provide cooling capacity to the raw material air 101 for separation and the contaminated nitrogen 107 that is compressed and water-cooled and returned to the device. Simultaneously, the dirty liquid nitrogen 111 drawn from the upper part of the lower tower is supercooled by the liquid nitrogen subcooler 12 and merged with another stream of dirty liquid nitrogen 110, then throttled to the upper tower 9 as the reflux liquid of the upper tower 9. The liquid nitrogen 105 extracted from the condensing evaporator 10 between the two towers will all become liquid nitrogen products 106 after being subcooled by the liquid nitrogen subcooler 12 .

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Abstract

Air separation methods and devices, particularly relates to the air separation methods and devices when rectification is used in air separation at low temperatures. The pretreated raw air material is cooled at the main heat exchanger, directly enter into the rectifying column for rectification; compress and chill the returning polluted nitrogen (or returning nitrogen) leaving out the cooling box of the main heat exchanger, turbocharged and cooled, then enters the main heat exchanger and cooled to a certain temperature, the middle part was sent to polluted nitrogen (or nitrogen gas) expansion machine; gas works, reduces pressure and temperature then returned to the cooling heat exchanger, the remaining part was continually cooled in the main heat exchanger, after liquefied and cooled, join with part of the liquid nitrogen or polluted liquid nitrogen out of subcooler, after throttled and decompressed, get into the upper tower of the rectifying tower as the returning fluid of the tower, a gasometrical device was set on the pipeline of the returning polluted nitrogen (or returning nitrogen) cooling box; the air separation device can produce 10% more liquid nitrogen products and reduce the power consumption of products unit, further optimize performance cost proportion.

Description

technical field [0001] The present invention relates to a method and device for air separation, in particular to a method and device for separating air by rectification at low temperature. Background technique [0002] Before the present invention was proposed, various components such as oxygen, nitrogen, argon etc. in the air were to be separated into single products of various forms, the air was first liquefied and then separated by rectification technology. Because the liquefaction temperature of air is very low (the critical temperature is -140.7°C), the method and device for separating air by rectification technology at low temperature require a large amount of energy from the outside to obtain a considerable cooling capacity. Especially when liquid products need to be provided, the outside world will provide a larger amount of energy. Therefore, the air separation industry is a high energy consumption industry. People have also proposed many air separation methods an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25J3/04
CPCF25J3/04393F25J2200/20F25J3/04412F25J3/04315F25J3/04278F25J2270/90F25J3/04406F25J3/04357
Inventor 薛鲁江楚标
Owner SUZHOU XINGLU AIR SEPARATION PLANT SCI & TECH DEV CO LTD