KR-20260067637-A - Method for predicting the performance of a gas separation system using a gas separation membrane

Abstract

The present invention provides a method for predicting the performance of a gas separation system using a gas separation membrane.

Inventors

• 이상중
• 남상아
• 조수연
• 임백규
• 안소진
• 손덕원
• 김상희

Assignees

• 롯데케미칼 주식회사

Dates

Publication Date

20260513

Application Date

20241106

Claims (7)

1. In a gas separation system using a gas separation membrane, A step of selecting a gas with high gas permeability (fast gas) and a gas with low gas permeability (slow gas) respectively within the supply gas; A step of measuring the concentration of a gas having high gas permeability (Pf) and the concentration of a gas having low gas permeability (Ps) in the permeate gas that has passed through the gas separation membrane; A step of measuring the concentration of a gas having high gas permeability (Rf) and the concentration of a gas having low gas permeability (Rs) within the residual gas that did not pass through the gas separation membrane; A step of deriving a gas separation membrane level prediction formula using the above Pf, Ps, Rf, and Rs, and setting a standard value according to the gas separation membrane level prediction formula through a pilot test; and A step of determining whether there is an abnormality in the gas separation system according to the above standard value; comprising Method for predicting the performance of a gas separation system using a gas separation membrane.
2. In claim 1, A method for predicting the performance of a gas separation system using a gas separation membrane, wherein the gas having high gas permeability (fast gas) is a target gas to be separated and recovered through a gas separation system, and the gas having low gas permeability (slow gas) is selected from among gases having a gas permeability lower than that of the target gas.
3. In claim 2, A method for predicting the performance of a gas separation system using a gas separation membrane, wherein the above-mentioned supply gas is combustion exhaust gas and the above-mentioned target gas is carbon dioxide.
4. In claim 1, A method for predicting the performance of a gas separation system using a gas separation membrane, wherein the above gas separation membrane level prediction formula is according to the following Equation 1: [Equation 1] .
5. In claim 1, A method for predicting the performance of a gas separation system using a gas separation membrane, wherein the above standard value is determined from the minimum recovery rate of a gas (fast gas) having high gas permeability.
6. In claim 1, A method for predicting the performance of a gas separation system using a gas separation membrane, wherein the step of determining whether there is an abnormality in the gas separation system is to determine that there is an abnormality in the gas separation system when the value according to the gas separation membrane level prediction formula rises by 10% or more compared to the standard value.
7. In claim 6, A method for predicting the performance of a gas separation system using a gas separation membrane, further comprising the step of performing at least one of changing the gas composition in the supply gas, changing the pressure of the supply gas, cleaning the separation membrane, and replacing the separation membrane when it is determined that there is an abnormality in the gas separation system.

Description

Method for predicting the performance of a gas separation system using a gas separation membrane The present invention relates to a method for predicting the performance of a gas separation system using a gas separation membrane. As the development of CO2 Capture and Storage (CCS) technology for reducing greenhouse gas emissions accelerates, the level of CO2 capture technology is reaching the commercialization stage. CO2 capture processes include wet capture, dry capture, and membrane capture technologies. Among these, membrane capture technology captures carbon dioxide by utilizing the difference in permeation rates of different gases through membrane materials; unlike wet and dry capture, it separates carbon dioxide in its gaseous state without phase change, making it an eco-friendly technology that emits no pollutants. Currently, carbon dioxide capture processes using membrane capture technology are focusing on research such as the development of membrane materials and modules to capture carbon dioxide contained in combustion flue gas, but there is a complete lack of research on the operation methods of gas separation systems utilizing effective gas separation membranes. Figure 1 is intended to explain the operation process of a gas separation membrane. Figure 2 shows the relative gas permeation rates for various gases. In this specification, when a part is described as "comprising" a certain component, it means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. In this specification, a gas separation membrane may refer to a gas separation membrane module comprising a polymer separation membrane. The inventors recognized that when operating a gas separation system using a gas separation membrane for gas separation recovery and/or capture, it is very difficult to identify the point at which economic efficiency declines due to reasons such as abnormalities in the supply gas or performance degradation of the gas separation membrane, and thus completed the present invention. For example, in the conventional case, a method was used to determine the state of the gas separation membrane by calculating the recovery rate of the target gas using the flow rate of the supply gas, the flow rate of the permeate gas, the concentration of the target gas in the supply gas, and the concentration of the target gas in the permeate gas. However, such a method can only predict the performance of the gas separation membrane for a single gas and has limitations in verifying the overall separation efficiency of the target gas concentration using the gas separation membrane, and there is a problem in that it is difficult to check the flow rate in real time. Accordingly, the present invention provides a method for predicting the performance of a gas separation system using a gas separation membrane in real time by using only the concentration of a specific gas component in the permeate gas and the residual gas. The present invention will be described in detail below. One embodiment of the present invention is, In a gas separation system using a gas separation membrane, A step of selecting a gas with high gas permeability (fast gas) and a gas with low gas permeability (slow gas) respectively within the supply gas; A step of measuring the concentration of a gas having high gas permeability (Pf) and the concentration of a gas having low gas permeability (Ps) in the permeate gas that has passed through the gas separation membrane; A step of measuring the concentration of a gas having high gas permeability (Rf) and the concentration of a gas having low gas permeability (Rs) within the residual gas that did not pass through the gas separation membrane; A step of deriving a gas separation membrane level prediction formula using the above Pf, Ps, Rf, and Rs, and setting a standard value according to the gas separation membrane level prediction formula through a pilot test; and A step of determining whether there is an abnormality in the gas separation system according to the above standard value; comprising A method for predicting the performance of a gas separation system using a gas separation membrane is provided. Figure 1 is intended to explain the operation process of a gas separation membrane. Specifically, among the feed gases, gases with high gas permeability are recovered as permeate gas, and gases with low gas permeability can be recovered as residual gas. For example, a feed gas containing carbon dioxide and nitrogen, such as combustion flue gas, is introduced into a gas separation membrane. Carbon dioxide, which has a high permeation rate through a polymer membrane, is selectively permeated through the membrane and discharged as permeate gas containing a high concentration of carbon dioxide, while the remaining gases, such as nitrogen gas, which have a relatively slow permeation rate, are discharged as residual gas. In other words, the greater the difference