INP

Leibniz Institute for Plasma Science and Technology
Felix-Hausdorff-Str. 2
17489 Greifswald
GERMANY

https://www.inp-greifswald.de/en/
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The Leibniz Institute for Plasma Science and Technology (INP) is the largest non-university institute in the field of low temperature plasmas, their basics and technical applications in Europe. The institute carries out research and development from idea to prototype. The topics focus on the needs of the market. At present, plasmas for materials and energy as well as for environment and health are the focus of interest.

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Creative Commons Attribution 4.0 International (CC BY 4.0)
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Towards plasma-enhanced gasification: investigating free-burning carbon arcs in molecular gas mixtures - dataset

Thermal Plasma Technology

A pre-study of free burning arcs between carbon electrodes for potential use in gasification processes is presented. Free-burning arcs offer the potential to be used without additional gas feed or significant changes to gas flows in established gasification systems as well as with minimal cooling requirements for improved energy efficiency. Direct current (DC) arcs with currents up to 200 A and power levels up to 40 kW have been operated in molecular gas mixtures of H2, CO and CO2. The electrical characteristics and dynamic behaviour of the arcs under various electrode configurations have been analysed, along with an assessment of electrode erosion. Finally, concepts for the power sources have been deduced and tested.

Gasification
electric arcs
FieldValue
Group
INP
IEC
Authors
Pieterse, Petrus Jacobus
Gonzalez, Diego
Najam, Ammar
Schimpke, Ronny
Gräbner, Martin
Uhrlandt, Dirk
Release Date
2025-09-02
Identifier
0a2fee47-23d5-41b0-b9fd-a7ee525a3d00
Permanent Identifier (DOI)
10.34711/inptdat.933
Permanent Identifier (URI)
https://www.inptdat.de/node/933
Plasma Source Name
Carbon Arc
Plasma Source Application
Plasma assisted gasification of solid fuels
Gasification
Plasma Source Specification
DC
atmospheric pressure
thermal
Plasma Source Properties

Two different setups each with graphite electrodes

Setup A for pre-tests with two cylindrical electrodes made of graphite with a diameter of 9 mm and a length fo 85 mm. The electrode conficuration is positioned in a polymethyl methacrylate (PMMA) chamber. A DC pulse current source based on a capacitor bank was used providing approximately rectangular pulses with nearly constant current of up to 200 A over up to 20 ms is used for the arc operation. The capacity charging voltages are between 500 and 1500 V.

Setup B for a later use in a gasification reactor with two cylindrical electrodes; a graphite rod cathode with a diameter of 30 mm and a length of 800 mm, where a smaller conical tip rod electrode with a diameter of 9 mm was fitted to the end, is mounted to a linear actuator CTC-060. A shorter graphite rod electrode of a diameter of 30 mm is used as the anode and mounted to the wall of the chamber opposite the cathode. The cathode with the actuator is mounted in a feeding unit. The cathode tip and the anode are positioned in a steel chamber. A DC power source Trumpf Hüttinger DC3050, which delivers currents up to 125 A, power up to 50 kW, and voltages up to 800 V was used.
Plasma Source Procedure

Setup A: The electrodes are initially in contact with their tips and were tilted quickly for arc ignition – a gap distance of 16 mm is reached after 10 ms.

Setup B: At the start the cathode tip is in contact with the anode, the cathode can be moved along the common axis of the electrodes to reach gap distances of up to 100 mm.
Plasma Medium Name
CO2
H2-CO
H2-CO2-CO
Plasma Medium Properties

Setup A: the PMMA chamber is filled with four different gas mixtures: CO2 (a), 30% H2 + 70% CO2 (b), 30% H2 + 70% CO (c), 33% H2 + 33% CO2 + 33% CO (d) at atmospheric pressure

Setup B: the steel chamber is filled with CO2 at atmospheric pressure
Plasma Medium Procedure

Flushing of the chambers for 20 s before filling, no gas flow during arc operation
Plasma Diagnostics Name
electrical measurements
high-speed imaging
Plasma Diagnostics Properties

Electric measurements:

Setup A: arc current and voltage with a Pearson monitor Model 58 1423 and a voltage probe Tektronix 6015A, recording with an oscilloscope Yokogawa DLM3000

Setup B: arc current and voltage with a 26 m shunt and a Teledyne LeCroy PPE6kV Oscilloscope probe, recording with a Yokogawa DLM2054 digital oscilloscope.

High-speed imaging:

Setup A with 1024×1024 pixel matrix camera IDT-MotionPro Y4 at typically 10000 fps and 1 μs exposure time

Setup B with Photron FASTCAM NOVA R3, Modell 150K-M-16GB at a typical frame rate of 1000 fps and exposure time of 2 μs
Language
English
License
Creative Commons Attribution 4.0 International (CC BY 4.0)
Public Access Level
Public
Contact Name
Uhrlandt, Dirk
Contact Email
uhrlandt@inp-greifswald.de

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