Method for deeply drying gas

A technology for drying and raw gas, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., can solve the problems of difficult regeneration, waste of regeneration energy consumption, etc.

Inactive Publication Date: 2009-12-09
杨皓
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since molecular sieves such as 5A, 4A, and 13X are difficult to regenerate after adsorbing water vapor, it is necessary to invest a lot in the construction of devices and waste more regeneration energy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: The hydrogen concentration of a certain gas is 99.9%, the water vapor content is 20°C dew point, and the dew point needs to be lowered to below -70°C.

[0015] After compression to a pressure of 0.3MPa (table), after pre-purification, the mechanical water component in the gas is removed to become the raw material gas. Two adsorption towers are installed, one of which passes the raw material gas, and the gas concentration at the outlet of the adsorption tower is from dew point to -70 Below ℃, another tower is used to regenerate the adsorbent. The two towers are operated alternately to obtain qualified purified gas.

[0016] Each adsorption tower is equipped with three layers of adsorbents, the first layer is 1 / 3 of activated alumina, the second layer is 1 / 3 of silica gel, and the third layer is 1 / 3 of 13X molecular sieve.

[0017] In the regeneration state of the adsorption tower, the front-stage adsorbent can desorb most of the adsorbed water through the dep...

Embodiment 2

[0018] Example 2: A gas with a carbon monoxide concentration of 99.99% and a water vapor content of 100 ppm needs to reduce the water vapor to below 1 ppm.

[0019] After being compressed to a pressure of 0.1MPa (table), two adsorption towers are set, one of which passes through the feed gas, the gas concentration at the outlet of the adsorption tower is below 1ppm, and the other tower is used to regenerate the adsorbent.

[0020] Each adsorption tower is equipped with two layers of adsorbent, the first layer is 2 / 3 of activated alumina, and the second layer is 1 / 3 of 13X molecular sieve.

[0021] In the regeneration state of the adsorption tower, the front-stage adsorbent can desorb most of the adsorbed water through the depressurization process, and at the same time, the dried purified gas is used to purge the heated 13X molecular sieve layer, so that the water adsorbed by the 13X molecular sieve layer is gradually desorbed, while The outflowing purge gas directly continues ...

Embodiment 3

[0022] Example 3: A certain gas has a methane concentration of 99% and a water vapor content of 1%. It is necessary to reduce the water vapor to below 0.05%.

[0023] After being compressed to a pressure of 1.0MPa (table), three adsorption towers are set, one of which passes through the feed gas, the gas concentration at the outlet of the adsorption tower is below 0.05%, and the other two towers are used to regenerate the adsorbent.

[0024] Each adsorption tower is equipped with two layers of adsorbent, the first layer is 2 / 3 of silica gel, and the second layer is 1 / 3 of 5A molecular sieve.

[0025] In the regeneration state of the adsorption tower, the adsorbent in the front stage can desorb most of the adsorbed water through the depressurization process, and at the same time, the dried purified gas is used to purge the heated 5A molecular sieve layer, so that the water adsorbed by the 5A molecular sieve layer is gradually desorbed, while The outflowing purge gas directly co...

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PUM

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Abstract

The invention discloses a method for deeply drying water vapor-containing mixed gas, relating to the method using multilayer sectionalized adsorption. The water vapor-containing mixed gas is feed gas. The method for deeply reducing the content of water vapor is characterized by using the pressure variation and temperature swing adsorption gas separation process and having at least two adsorbers, wherein, purified gas with low water vapor content is obtained after the feed gas passes through one adsorber, at least two kinds of adsorbents are arranged in the adsorber, the front section is provided with the adsorbent with low vapor drying capability and easy deabsorption, the rear section is provided with the adsorbent with high vapor drying capability and hard deabsorption, and the adsorbent of the front section can desorb most adsorbed water by the process of pressure reduction; and meanwhile, gas which flows out during the regeneration of the adsorbent of the rear section has the function of regenration on the adsorbent of the front section. The feed gas can be hydrogen, carbon dioxide, carbon monoxide, methane, ethane, propane, butane, ethylene, acetylene, nitrogen, oxygen, argon, helium and other raw materials which are applicable to the industries of chemical engineering, metallurgy, aviation, etc.

Description

1. Technical field [0001] The invention relates to the field of gas separation, and relates to a method for separating some components in a gas mixture by using pressure swing adsorption and temperature swing adsorption technology. 2. Background technology [0002] For the deep drying of pure gas, the commonly used method is temperature swing adsorption. Using the temperature swing adsorption process, molecular sieves such as 5A, 4A, and 13X are usually used as desiccants. Since molecular sieves such as 5A, 4A, and 13X are difficult to regenerate after adsorbing water vapor, it is necessary to invest a lot in the construction of devices and waste more regeneration energy. [0003] For the process flow that uses molecular sieves such as 5A, 4A, and 13X as desiccants, since all adsorbents need to use high-calorie gas to regenerate the adsorbent, the total heat required is relatively large. 3. Contents of the invention [0004] In order to reduce energy consumption and save...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/26B01D53/047
Inventor 杨皓
Owner 杨皓
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