Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for enhancing oxygen permeation process of mixed conductor membrane by plasma

A technology of mixed conductor membrane and plasma, which is applied in the field of ions, can solve the problems of low surface exchange rate of mixed conductor membrane and low membrane surface exchange rate, and achieve the goal of improving oxygen permeability, increasing surface exchange rate and reducing energy consumption Effect

Pending Publication Date: 2021-06-22
NANJING UNIV OF TECH
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is in order to solve the problem that the surface exchange rate of the mixed conductor film is low at low temperature mentioned in the above-mentioned technical background
This invention successfully solves the problem of low membrane surface exchange rate at low temperature. Specifically, it uses the discharge process to make the gas plasma, which has higher chemical reactivity, so that it can interact with the surface of the mixed conductor material at a lower temperature. Oxygen molecules are converted into oxygen ions and carry out the oxygen permeation process, which greatly improves the oxygen flux of the membrane at a lower temperature, greatly improves the economy of the oxygen permeation process, and creates excellent conditions for the scale-up application of mixed conductor oxygen permeable membranes. condition

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for enhancing oxygen permeation process of mixed conductor membrane by plasma
  • Method for enhancing oxygen permeation process of mixed conductor membrane by plasma
  • Method for enhancing oxygen permeation process of mixed conductor membrane by plasma

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Such as figure 1 , choose a Ba with a diameter of 15mm and a thickness of 1.2mm 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3-δ Dense sheet membrane, sealed with silver glue and fixed on the corundum tube assembly (6) (effective diameter 11mm), connecting the membrane assembly and He gas purge gas (1), purge gas source (9) He decompressed The valve (2) adjusts the pressure to 0.1MPa, and the flow rate is adjusted to 40mL / min by the flow controller (3). The jet plasma generator is at a distance of 100mm from the membrane surface, and the input power of the plasma generator is set to 500W, the working gas source (1)-air is turned on, and the gas pressure is 0.1MPa after passing through the pressure reducing valve (2). After passing through the flow controller (3), the flow rate is 30L / min; first, it moves to the membrane surface at a constant speed of 10mm / min to the 70mm position of the membrane surface, and then moves to the membrane surface at a constant speed of 5mm / min to the p...

Embodiment 2

[0039] Such as figure 2 , select a La with a diameter of 15mm and a thickness of 1.0mm 0.5 Sr 0.5 co 0.2 Fe 0.8 o 3-δ The dense sheet membrane is sealed with silver glue and fixed on the corundum tube assembly. A ring-shaped stainless steel outer electrode is arranged on the outside of the corundum tube seal for dielectric barrier discharge. A cylindrical stainless steel inner electrode with a diameter of 1 mm is used on the inside. The electrode is located in the inlet In the middle of the feed gas corundum tube (11), the distance between the top of the inner electrode or the outer electrode and the membrane surface is 3mm, connecting the membrane module and the He gas purge gas (9). The whole device was placed in a vertical furnace and heated to 1173K for oxygen permeability experiment. The pressure of the purge gas He is adjusted to 0.2MPa through the pressure reducing valve (2), the flow rate is adjusted to 40mL / min through the flow controller (3), the air flow rate o...

Embodiment 3

[0041] Such as image 3 , choose a seven-channel Ba with an outer diameter of 2.4mm and an aperture of 0.6mm 0.5 Sr 0.5 co 0.8 Fe 0.2 o 3-δ The hollow fiber membrane is sealed with silver glue and fixed on the quartz tube assembly. The assembly is connected and purged with He gas. The pressure of the purge gas (9) is adjusted to 0.1 MPa through the pressure reducing valve (2), and the flow rate is passed through the flow controller (3 ) is adjusted to 40mL / min, and the input power of the plasma generator (4) is set to 600W. The jet plasma generator is at a position 100mm away from the membrane surface, and the working gas source (1)-air is turned on. After passing through the pressure reducing valve (2), the gas pressure is 0.1MPa, and the gas flow rate through the flow controller (3) is 25L / min . First move to the membrane surface at a constant speed of 10mm / min to the 70mm position of the membrane surface, then move to the membrane surface at a constant speed of 5mm / mi...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a method for enhancing an oxygen permeation process of a mixed conductor membrane by plasma, and belongs to the technical field of material chemical engineering. According to the method, a large number of active particles generated in the atmospheric pressure low-temperature plasma discharge process act on the surface of a mixed conductor oxygen permeation membrane material, the activation energy of the oxygen reduction process of the surface of the oxygen permeation membrane is reduced, and thus the membrane flux is improved. According to the method, the plasma technology and the oxygen permeation membrane technology are combined, the oxygen flux is further improved, the operation temperature during target flux is reduced, and energy consumption in the oxygen separation process is further saved.

Description

technical field [0001] The invention relates to the field of low-temperature plasma and the field of separation technology, and specifically designs a plasma-enhanced oxygen-permeation process, especially a mixed-conductor oxygen-permeation process that uses plasma as a feedstock for purging at high temperatures. Background technique [0002] Mixed conductor materials are a class of materials that are absolutely selective to oxygen at high temperatures. When oxygen permeates the membrane, it mainly undergoes two surface exchange steps and one bulk diffusion. Steps: (I) oxygen is adsorbed on the gas-solid surface on the high oxygen partial pressure side and converted into oxygen ions by electrons; (II) oxygen ions are absorbed in the membrane material In the bulk phase, the oxygen vacancies generated at high temperature diffuse from the high oxygen partial pressure side to the low oxygen partial pressure side; (III) Oxygen ions lose electrons on the solid gas surface at the l...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B01J8/02B01J8/00B01J19/08
CPCB01J8/02B01J8/008B01J8/009B01J19/08
Inventor 张广儒郑乾坤王天雷刘郑堃金万勤
Owner NANJING UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com