Reaction device and method for activation of carbon dioxide by disturbance-enhanced dielectric barrier discharge

Abstract

The invention discloses a reaction device and a method for activation of carbon dioxide by disturbance enhanced dielectric barrier discharge, wherein the device comprises a dielectric barrier discharge reactor, a high-voltage pulse power source and an online infrared analyzer. The dielectric barrier discharge reactor mainly comprises a tangential inlet, an inner electrode, an outer electrode, a quartz tube and the like. The inner electrode is an integral shape of the lower round table and the upper cone. The outer electrode is arranged around the outer wall of the quartz tube. The carbon dioxide forms a spiraling airflow through the two-way tangential flow. A filament discharge formed between the inner and outer electrodes is violently disturbed under the impetus of the spiral airflow, fully develops toward the increase direction of the pole gap, and forms a large-area, disturbance-enhancing discharge region. The carbon dioxide is efficiently activated and decomposed by high energy electrons and active particles. The reaction device and the method for activation of carbon dioxide by disturbance enhanced dielectric barrier discharge have the advantages that the gas residence time ofis long, the reaction zone is highly disturbed, the high-efficiency vibration excitation decomposition is fully developed, and the carbon dioxide activation effect is optimized.

Description

technical field [0001] The invention relates to the field of resource utilization of greenhouse gases, in particular to a reaction device and method for activating carbon dioxide by a disturbance-enhanced dielectric barrier discharge. Background technique [0002] The most comprehensive climate change assessment report ever issued by the United Nations Intergovernmental Panel on Climate Change (IPCC) - the "Fifth Assessment Report Synthesis Report" clearly pointed out that the impact of greenhouse gas emissions caused by human activities on the climate system is constantly increasing . As the most important greenhouse gas, the global emission of carbon dioxide has reached 37.1 billion tons (2018). To achieve the 1.5°C goal set out in the Paris Agreement, carbon dioxide emissions need to be reduced by 50% by 2030 and reach zero by 2050. Therefore, governments and relevant scholars are facing unprecedented pressure to reduce carbon emissions. In order to achieve carbon emis...

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Problems solved by technology

Traditional thermochemical activation methods require extremely high temperatures, resulting in energy waste and difficult to apply

Thermodynamic calculations show that carbon dioxide begins to decompose at a high temperature of 2000K, and the conversion rate is still less than 1% at this time

In the field of carbon dioxide activation, dielectric barrier discharge also shows good prospects. For example, the conversion rate of carbon dioxide at low flow rate can reach 40%. However, due to the limitation of the structure and characteristics of the reactor, the reaction efficiency of carbon dioxide activation needs to be improved, and its potential has not fully excavated

[0006] The distance between the two electrodes of the traditional dielectric barrier discharge device is consistent, which is not conducive to the full development of the discharge area, and is prone to partial discharge, resulting in uneven discharge; the reduced field strength between the two electrodes is too high, which makes the electron temperature too high, which is not conducive to carbon dioxide vibration The formation of excited state molecules, and this step is the key step to realize the efficient activation of carbon dioxide; at the same time, the residence time of the reactants in the discharge area and the degree of disturbance of the discharge need to be improved

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