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Device and method for purifying CO2 in natural gas by low-temperature pressure swing adsorption process

A technology of pressure swing adsorption and natural gas, which is applied in the direction of chemical instruments and methods, separation methods, gas fuels, etc., to achieve the effects of increasing adsorption capacity, reducing use, and reducing costs

Active Publication Date: 2018-04-10
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, pressure swing adsorption method and temperature swing adsorption method are relatively mature adsorption separation methods, which have been widely used in petrochemical, iron and steel, metallurgy and other fields, but there are few studies on natural gas purification.

Method used

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  • Device and method for purifying CO2 in natural gas by low-temperature pressure swing adsorption process
  • Device and method for purifying CO2 in natural gas by low-temperature pressure swing adsorption process
  • Device and method for purifying CO2 in natural gas by low-temperature pressure swing adsorption process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The pretreated natural gas with a pressure of 1.6MPa is pre-cooled to 0°C, and passed into the low-temperature pressure swing adsorption purification natural gas system that has been cooled to -10°C. The adsorber has been pre-loaded with coconut shell activated carbon and activated carbon particles. Diameter 1 ~ 3mm, specific surface area greater than 500m 2 / g. At this time, the low-temperature pressure swing adsorption purification natural gas system is in a low-temperature and high-pressure state, and the solid adsorbent will degrade the CO in natural gas. 2 Adsorbed, but little or no adsorption of CH 4 . The natural gas in the low temperature state continuously passes through the system, and the solid adsorbent continuously degrades the CO in the natural gas. 2 Adsorption is carried out to achieve the purpose of purifying natural gas. Dynamic breakthrough curves such as image 3 shown. CH 4 The breakthrough time is 1840s, CO 2 Breakthrough time is 6120s, CO ...

Embodiment 2

[0043] The pretreated natural gas with a pressure of 3.8MPa is pre-cooled to -10°C, and passed into the low-temperature pressure swing adsorption purification natural gas system that has been cooled to -20°C. The adsorber has been pre-loaded with 13X molecular sieve, molecular sieve particles Diameter 1.5 ~ 3mm, specific surface area greater than 650m 2 / g. At this time, the low-temperature pressure swing adsorption purification natural gas system is in a low-temperature and high-pressure state, and the solid adsorbent will degrade the CO in natural gas. 2 Adsorbed, but little or no adsorption of CH 4 . The natural gas in the low temperature state continuously passes through the system, and the solid adsorbent continuously degrades the CO in the natural gas. 2 Adsorption is carried out to achieve the purpose of purifying natural gas. Dynamic breakthrough curves such as Figure 5 shown. CH 4 The breakthrough time is 2240s, CO 2 Breakthrough time is 7210s, CO 2 / CH 4 T...

Embodiment 3

[0045] The pretreated natural gas with a pressure of 6.5MPa is pre-cooled to -10°C in the first stage, and passed into the low-temperature pressure swing adsorption purification natural gas system that has been cooled to -30°C. The adsorber has been pre-loaded with mesoporous material MCM- 41. The particle size of mesoporous materials is 2-4mm, and the specific surface area is greater than 800m 2 / g. At this time, the low-temperature pressure swing adsorption purification natural gas system is in a low-temperature and high-pressure state, and the solid adsorbent will degrade the CO in natural gas. 2 Adsorbed, but little or no adsorption of CH 4 . The natural gas in the low temperature state continuously passes through the system, and the solid adsorbent continuously degrades the CO in the natural gas. 2 Adsorption is carried out to achieve the purpose of purifying natural gas. Dynamic breakthrough curves such as Figure 7 shown. CH 4 The breakthrough time is 3140s, CO ...

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Abstract

The invention belongs to the technical field of gas separation and purification and provides an apparatus of purifying CO2 in natural gas through a low-temperature pressure swing adsorption (PSA) technology and a method thereof. In the invention, by means of cooling capacity generated in liquefaction of natural gas, a low-temperature environment is formed to control the temperature within the range of -70 - 25 DEG C, and meanwhile, through change of pressure within the range of 0-10 MPa, an absorption process of CO2 at a low temperature with the solid absorbent is achieved. By means of increase of the temperature and reduction of the pressure of the low-temperature PSA natural gas purifying system, the CO2 in the solid absorbent is desorbed, thereby regenerating the absorbent and finally achieving the object of continuously purifying the natural gas and regenerating the absorbent. The solid absorbent can be regenerated through increase of temperature and change of pressure, thereby recycling the solid absorbent and further reducing the use of the absorbent. The apparatus is simple and available in operation process. The process can complete purification of natural gas and achieve adsorption, enrichment and capture of CO2, and also has significant practical significance in environment protection.

Description

technical field [0001] The invention belongs to the technical field of gas separation and purification, and in particular relates to a low-temperature pressure swing adsorption process for purifying CO in natural gas. 2 device and method thereof. Background technique [0002] Natural gas has been widely used due to its cleanness and pollution-free, high safety and high energy density, and it has been paid more and more attention by various countries in the field of energy utilization. Natural gas is easy to transport by pipeline, so the natural gas from oil and gas fields in remote areas can be transported to densely populated cities through the pipeline network to solve the fuel problem in cities. For longer-distance transportation, in recent years, natural gas tends to be liquefied first, and then transported to factories or gasification stations through LNG (liquefied natural gas) ships and low-temperature tankers. [0003] Of course, no matter what kind of transportati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/10B01D53/047
CPCY02C20/40
Inventor 刘学武刘宝林景满军邹久朋胡大鹏
Owner DALIAN UNIV OF TECH
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