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Method for separating air

An air separation and air technology, applied in cold treatment separation, liquefaction, solidification, etc., can solve the problems of poor cost performance and high energy consumption per unit liquid air separation product, and achieve the effect of improving cost performance and reducing energy consumption

Active Publication Date: 2013-05-01
湖北和远气体股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]The cost performance of these two refrigeration cycle processes is relatively poor, and the energy consumption per unit of liquid air separation product is relatively high

Method used

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  • Method for separating air
  • Method for separating air
  • Method for separating air

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment one: see attached figure 1 shown.

[0036] An air separation method adopts a rectification tower comprising an upper tower 4, a lower tower 2 and a condensing evaporator 3 to rectify air. In this air separation method, the main refrigeration cycle provides most of the cooling capacity required for rectification, and the other part of the cooling capacity required for rectification is provided by the expansion refrigeration of the reflux waste nitrogen.

[0037] The main refrigeration cycle includes a circulating compressor 10 , a high-temperature supercharged turboexpander 9 , a low-temperature supercharged turboexpander 8 , a first water cooler 11 , a second water cooler 12 , and a third water cooler 13 . The circulating working medium used in the main refrigeration cycle in this embodiment is dirty nitrogen.

[0038] After being compressed by the compressor and cooled in the pre-cooling system, the raw material air 101, which removes harmful impu...

Embodiment 2

[0043] Embodiment two: see attached figure 2 shown.

[0044] An air separation method adopts a rectification tower comprising an upper tower 4, a lower tower 2 and a condensing evaporator 3 to rectify air. In this air separation method, the main refrigeration cycle provides most of the cooling capacity required for rectification, and the other part of the cooling capacity required for rectification is provided by the expansion refrigeration of the reflux waste nitrogen.

[0045] The main refrigeration cycle includes a circulating compressor 10 , a high-temperature supercharged turboexpander 9 , a low-temperature supercharged turboexpander 8 , a first water cooler 11 , a second water cooler 12 , and a third water cooler 13 . The circulating working medium used in the main refrigeration cycle in this embodiment is air.

[0046] After being compressed by the compressor and cooled in the pre-cooling system, the raw material air 101, which removes harmful impurities such ...

Embodiment 3

[0051] Embodiment three: see attached image 3 shown.

[0052] An air separation method adopts a rectification tower comprising an upper tower 4, a lower tower 2 and a condensing evaporator 3 to rectify air. In this air separation method, the main refrigeration cycle provides most of the cooling capacity required for rectification, and the other part of the cooling capacity required for rectification is provided by the expansion refrigeration of the reflux waste nitrogen.

[0053] The main refrigeration cycle includes a circulating compressor 10 , a high-temperature supercharged turboexpander 9 , a low-temperature supercharged turboexpander 8 , a first water cooler 11 , a second water cooler 12 , and a third water cooler 13 . The circulating working medium used in the main refrigeration cycle in this embodiment is pure nitrogen.

[0054] After being compressed by the compressor and cooled in the pre-cooling system, the raw material air 101, which removes harmful impu...

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Abstract

The invention relates to a method for separating air, which is mainly used for producing a liquid air-separated product. The method not only uses a high-low temperature boosting turbine expansion machine, improves operation pressures of an upper tower and a lower tower, but also uses a reflux waste nitrogen boosting turbine expansion machine. By the invention, the power consumption of the unit liquid air-separated product can be reduced, the cost performance of an air separation device is improved, and the energy-saving and environmentally friendly requirements are met.

Description

technical field [0001] The invention relates to an air separation method mainly producing liquid air separation products. Background technique [0002] In the prior art, the air separation method that mainly produces liquid air separation products usually has two refrigeration cycle process flows. A commonly used refrigeration cycle process is: using a circulating compressor and a high-low temperature booster turbo expander, the upper and lower columns of the rectification column adopt conventional low-pressure pressure, and the expansion end of the high-low temperature booster turbo expander The outlet pressure is close to the operating pressure of the lower column of the rectification tower, and the outlet pressure of the circulating compressor is 2.5-3.0MPa. Another commonly used refrigeration cycle process is to use a circulating compressor, a booster turbo expander and a cryogenic refrigerator. The operating pressure of the upper and lower columns of the rectification ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25J3/04
CPCF25J3/04315F25J3/0406F25J3/0423F25J3/04357F25J3/04393F25J3/04412F25J2200/20F25J2230/42
Inventor 薛鲁江楚标
Owner 湖北和远气体股份有限公司