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A full temperature range pressure swing adsorption method for producing pure oxygen

A pressure swing adsorption, full temperature range technology, applied in chemical instruments and methods, oxygen preparation, oxygen/ozone/oxide/hydroxide, etc., can solve single problems, reduce workload, high yield, The effect of shortening the service life

Active Publication Date: 2018-07-10
ZHEJIANG TIANCAIYUNJI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention provides a full temperature-range pressure swing adsorption method for producing pure oxygen, which performs PSA separation in shallow cold and low pressure ranges and couples with cryogenic rectification separation technology, completely solving the single PSA method and cryogenic rectification method , and the problems existing in the simple combination of PSA and cryogenic distillation

Method used

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  • A full temperature range pressure swing adsorption method for producing pure oxygen

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Embodiment 1

[0044] Such as figure 1 As shown, a full temperature range pressure swing adsorption (FTrPSA) method for producing pure oxygen, the steps of the method are as follows:

[0045] (1) Pretreatment process;

[0046] a. Dust removal, the dust and mechanical particles in the raw material air are removed through the air filter, so as to obtain dust-free air, in addition to nitrogen (N 2 ) and oxygen (O 2 ) In addition to dust, moisture, carbon dioxide (CO 2 ), hydrocarbons (CnHm) and other impurities, the dust and mechanical particles are removed through the air filter; the content of solid impurities such as dust in the air is generally 0.005-0.02g / m 3 , the particle size of the dust is usually below 0.15mm; these solid impurities will increase the friction of the cylinder, blades and valves of the air compressor, and the solid dust brought to the cooler will cause heat transfer surface pollution, resulting in a decrease in the heat transfer coefficient. After the filter is remo...

Embodiment 2

[0060] On the basis of the full temperature range pressure swing adsorption (FTrPSA) method for producing pure oxygen described in Example 1, the air processing capacity and dust removal unit remain unchanged, and the dust-free air is sent into the air turbine for compression Compressed to 0.5-0.6MPa and then sent to the air cooling tower for cleaning, and pre-cooled to -60--50°C, and then entered into the 6 tower with an operating temperature of -60--50°C and an operating pressure of 0.5-0.6MPa The shallow cold and low-pressure adsorption and concentration process consists of obtaining oxygen-enriched gas with an oxygen content of 70-80% from the non-adsorption phase, and then passing through a process with an operating temperature of -60--50°C and an operating pressure of 0.5-0.6MPa. The shallow-cooled low-pressure molecular sieve adsorption impurity removal system composed of two towers, the purified (dried) oxygen-rich gas is cooled to close to the liquefaction temperature ...

Embodiment 3

[0062] On the basis of the full temperature range pressure swing adsorption (FTrPSA) method for producing pure oxygen described in Example 1, the air processing capacity and dust removal unit remain unchanged, and the dust-free air is sent into the air turbine for compression Compressed to 0.1-0.2MPa and then sent to the air cooling tower for cleaning, and pre-cooled to -20--10°C, and then entered into the 6 tower with an operating temperature of -20--10°C and an operating pressure of 0.1-0.2MPa The shallow cold and low-pressure adsorption and concentration process consists of obtaining oxygen-enriched gas with an oxygen content of 60-70% from the non-adsorption phase, and then passing through a process with an operating temperature of -20--10°C and an operating pressure of 0.1-0.2MPa. The shallow-cooled low-pressure molecular sieve adsorption impurity removal system composed of two towers, the purified (dried) oxygen-rich gas is cooled to close to the liquefaction temperature ...

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Abstract

A full-temperature-range pressure swing adsorption (FTrPSA) method for preparing pure oxygen is disclosed. The method includes a pretreating step, a light-cooling low-pressure adsorption concentration step and a deep-cooling rectification oxygen-preparing step. By utilizing that nitrogen (N2) has an extra high adsorption capacity at a low temperature, which is obviously different from oxygen (O2), the light-cooling low-pressure adsorption concentration step allows the N2 to be adsorbed and the O2 to be concentrated, an oxygen-rich gas formed after concentration is fed into a deep-cooling rectification system, and the load of the deep-cooling oxygen-preparing step is greatly reduced after a large amount of the N2 is removed and is at least reduced by 2 / 3, thus greatly reducing investment and energy consumption. Through combining light-cooling low-pressure adsorption concentration and deep-cooling rectification, a problem that traditional pressure swing adsorption oxygen-preparing methods are low in product purity and low in yield is overcome, and investment and energy consumption in traditional deep-cooling rectification methods are reduced. An oxygen product the purity of which is 99.5% or above is obtained, and the yield is higher than 90-92%.

Description

technical field [0001] The invention relates to the field of oxygen preparation, in particular to a full temperature-range pressure swing adsorption method for preparing pure oxygen. Background technique [0002] Oxygen (O 2 ) chemical properties are very active, so the application is very wide. In the metallurgical industry, the oxygen top-blown converter is used for steelmaking, and the open hearth furnace is used for oxygen-blown steelmaking. Pure oxygen (>99.2%) blowing in iron and steel enterprises greatly shortens the smelting time and improves the quality of steel. In the mechanical industry, oxygen is mainly used for metal cutting and welding. In the chemical industry, oxygen is mainly used for the oxidation of raw material gases for the production of ammonia. In the defense industry, oxygen is used as fuel propellant for arrows. This shows the importance of the preparation of pure oxygen in industry. At present, there are two main methods for the preparatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B13/02
CPCC01B13/0259C01B2210/0046C01B2210/0051C01B2210/0062C01B2210/007
Inventor 刘开莉钟佳航钟雨明蔡跃明
Owner ZHEJIANG TIANCAIYUNJI TECH CO LTD
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