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Low-purity oxygen air separating device and method

An air separation, low-purity oxygen technology, applied in liquefaction, coagulation, lighting and heating equipment, etc., can solve the problems of poor economy and high energy consumption, and achieve the effect of reducing production costs, low energy consumption and improving economic benefits

Inactive Publication Date: 2015-12-02
KAIFENG AIR SEPARATION GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For low-purity oxygen equipment, use the above two methods to prepare, high energy consumption and poor economy

Method used

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  • Low-purity oxygen air separating device and method

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Effect test

Embodiment 1

[0025] A device for separating low-purity oxygen and air, such as figure 1 As shown, it includes an air compression system, a front-end pre-cooling purification system 2 and a cold box 22. The air compression system includes a low-pressure air compressor 1 and a high-pressure air compressor 3. The cold box includes a main heat exchanger 6, The liquid oxygen evaporator 7, the expansion end 14 of the expander, and a rectification tower, the rectification tower includes a low-pressure tower 12, a high-pressure tower 8, an upper tower 10, a low-pressure tower condensation evaporator 13 and a rectification tower The condensation evaporator 9 between the tower and the high-pressure tower; the low-pressure air compressor is connected to the front-end pre-cooling purification system through the first pipe 101, and the first gas outlet of the front-end pre-cooling purification system passes through the second The pipeline 102 is connected to the low-pressure tower via the main heat exch...

Embodiment 2

[0030] A method for oxygen-air separation using the low-purity oxygen-air separation device described in the first embodiment, the method is as follows:

[0031] The air is compressed by a low-pressure air compressor and purified by the front-end pre-cooling and then divided into three parts: the first part of the air enters the main heat exchanger, is cooled by the reflux gas and then enters the low-pressure tower; the second part is equivalent to the expansion of the air enters The supercharging end of the turboexpander is supercharged. After supercharging, it is cooled by the cooler and then enters the main heat exchanger. After cooling to a certain temperature, it is drawn from the middle of the main heat exchanger into the expander, and the expanded air is sent to the upper tower; The third part of the air enters the high-pressure air compressor for compression, and a part of the air is extracted into the main heat exchanger for cooling and then enters the high-pressure tower...

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Abstract

The invention relates to a low-purity oxygen air separating device and method. The device comprises an air compression system, a front precooling purification system and a cold box. The air compression system comprises a low-pressure air compressor and a high-pressure air compressor. The cold box comprises a main heat exchanger, a liquid oxygen evaporator, an expansion end of an expansion machine and a rectifying tower. The rectifying tower comprises a lower-pressure lower tower, a high-pressure lower tower, an upper tower, a low-pressure lower tower condensation evaporator and a condensation evaporator located between the upper tower and the high-pressure lower tower. Through the low-purity oxygen air separating device and method, the rectifying potential of the rectifying tower is sufficiently excavated, and compared with a conventional double-tower process, energy consumption is reduced by more than 10%; operation is easier than mixing of pure oxygen and air, and the product extraction rate reaches up to 99% or more.

Description

Technical field [0001] The invention relates to the field of air separation, in particular to a device and method for separating low-purity oxygen and air. Background technique [0002] At present, the air separation device of the cryogenic process is widely used in the chemical and metallurgical industries, and the oxygen purity requirements are high. The oxygen purity required by the coal chemical industry and steelmaking industries is more than 99.6%. In some fields, oxygen-enriched oxygen can meet the requirements without requiring more than 99.6% of pure oxygen. The oxygen purity is 70% to 97%. For example, the oxygen purity required by non-ferrous smelting, oxygen-enriched combustion, power generation and other fields is about 95%. , The oxygen pressure is not higher than 0.4bar~2bar, which can meet the resistance loss of the conveying process. Oxygen-enriched air separation has a big market in the real industry and the future. For example, 200MWe oxygen-enriched coal requ...

Claims

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Application Information

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IPC IPC(8): F25J3/04
Inventor 郑三七王庆波孙宇翟彦邦李美玲孟松涛张建松赵雪莉
Owner KAIFENG AIR SEPARATION GROUP