A Modular Device for Nox Removal by Synergistic Catalysts with Large Area Along Surface dbd

Abstract

The invention discloses a modularized device for removing NOx by synergy of large-area creeping DBD (dielectric barrier discharge) and a catalyst and belongs to the field of plasma technology application. The modularized device is characterized in that medium tubes sleeve linear ground electrodes which are grounded firmly, and array-type linear high-voltage electrodes are embedded into the linear ground electrodes to form a creeping discharge area; array-type wire-wire electrodes (1) are disposed in a discharge reaction chamber (2) to form a modularized discharge-removal device, and the modularized discharge-removal device and the catalyst are used for removing NOx synergistically; discharge plasmas are generated by excitation of a power system (4), and a matching system (3) is used for guaranteeing power output of a power source; an electrodiagnosis system (7) and an optical diagnosis system (8) are used for online diagnosis of large-area creeping DBD, a gas detection system (6) is used for diagnosis of treatment effects of NOx supplied by a gas supply system (5), and a catalyst characterization system (9) is used for catalyst characterization and studying plasma and catalyst synergistic mechanisms.

Description

technical field [0001] The invention belongs to the application field of plasma technology. In particular, it involves the use of arrayed line-line electrodes, excited by a power supply system with a matching system to ensure power output, to generate large-area along-surface discharge plasma, and to cooperate with catalysts to process NO x Modular discharge-removal experimental setup. technical background [0002] In recent years, catalytic removal of NO x Both in laboratory research and in technical applications, it has received extensive attention. The traditional catalytic removal method usually has high requirements on the catalyst, the required materials are expensive, and the device is complicated. In practical applications, how to prevent catalyst poisoning still needs to be solved more perfectly. Plasma Synergistic Catalyst Removal of NO x Technology, because there are a large number of active species in the discharge plasma, it has a good effect on removing gas...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the traditional catalytic removal of NO x The method has problems such as high cost of raw materials, complex device structure, and easy failure of the catalyst, and the surface discharge of the "sandwich" structure is difficult to be applied on a spatial scale, and there are difficulties in realizing and diagnosing large-area discharge. The present invention provides a large-area surface discharge. Synergistic Catalyst Removal of NO x The modular device and experimental method are mainly composed of arrayed wire-wire electrodes, reaction chamber, matching system, power supply system, gas supply system, gas detection system, electrical diagnostic system, optical diagnostic system, and catalyst characterization system; the array type The line-line electrode is mainly composed of a plurality of linear high-voltage electrodes, dielectric tubes, linear ground electrodes, and fixtures arranged in an array; among them, the dielectric tube and the linear ground electrode are tubular structures, and the linear high-voltage electrodes contain solid metal Stud; the inner diameter of the dielectric tube is consistent with the outer diameter of the linear ground electrode; the linear ground electrode is inserted into the dielectric tube, the dielectric tube is arranged in an array, and the linear high-voltage electrode is inserted into the gap between the dielectric tubes; it is made of insulating plates The upper fixing part and the lower fixing part are respectively fixed on the top surface and the bottom surface of the sealed reaction chamber made of insulating material; the upper fixing part and the lower fixing part have holes, and the length of the linear high-voltage electrode is longer than that of the upper fixing part and the lower fixing part. The distance between the fixtures; the top of the linear high-voltage electrode and the medium pipe pass through the hole of the upper fixture and are fixed on the upper fixture; the lower ends of the linear high-voltage electrode and the linear ground electrode pass through the hole of the lower fixture, and fixed on the lower fixture; the top of each linear high-voltage electrode is connected to the metal plate between the upper fixture and the reaction chamber to form an array high-voltage electrode; the array high-voltage electrode is connected to the power system through a matching system; the ground electrode The terminal board is fixed between the lower fixture and the reaction chamber, and each linear ground electrode is connected to the ground electrode terminal board, and grounded through the ground electrode terminal board; The gas uniform plate is parallel to the front and rear sides of the reaction chamber, and fixed on both sides of the electrode in the arrayed line-line electrode through the corresponding hole groove of the lower fixing member, and the catalyst is placed in the gap formed between the gas uniform plate and the electrode; the reaction chamber There are a number of transparent air holes for gas passage symmetrically opened on the front and rear sides; the gas supply system is divided into two gas paths, the A path leads to the gas detection system, and the B path passes through the gas holes through the reaction chamber and then into the gas detection system. On-line detection of reaction gas concentration; large-area dielectric barrier discharge along the surface of the dielectric tube occurs between the linear high-voltage electrode and the linear ground electrode to form a discharge area; there is a quartz observation window on the side of the reaction chamber, and the electrical diagnosis system and belt The optical diagnosis system of the wired fiber optic probe conducts online diagnosis of the discharge plasma through the quartz observation window; before the optical diagnosis, part of the photosensitive element of the linear fiber optic probe is blocked, and the spectrum is observed at the same time to determine the corresponding relationship between the photosensitive element and the spatially resolved spectrum; Adjust the matching system to make the voltage and current waveforms stable, and the spectral intensity reach the maximum value to ensure the power output of the power system; the catalyst characterization system characterizes the catalyst in the discharge-removal reaction

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