Investigation of trace components in autothermal gas reforming processes

• Main Author: Muritala, Ibrahim Kolawole
• Other Authors: Technischen Universität Bergakademie Freiberg, Maschinenbau, Verfahrens- und Energietechnik
• Format: Doctoral Thesis
• Language: English
• Published: Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola" 2018
• Subjects: Erdgasreformierung; Synthesegaszusammensetzung; Quenchwasser; Temperatureinfluss; Hochdruck; Partialoxidation; pH-Wert-Regelung; Spurenstoffe; Spurenanalytik; Produktsynthesegas; Heißgas; Rohgas; Quenchwasseranalyse; Gasbehandlung; Synthesegasqualität; Gas-zu-Flüssigkeiten; Natural gas reforming; Syngas composition; Quench water; Temperature influence; High pressure; Partial oxidation; pH regulation; trace compounds; trace analysis; product synthesis gas; hot gas; raw gas; quench water analysis; gas treatment; syngas quality; gas-to-liquids; ddc:620; Synthesegas; Gasproduktion; Oxidation; Prozessoptimierung; Simulation; Reformieren <Chemie>; Gaszusammensetzung; Spurenstoff; Quenching; Temperaturabhängigkeit; Kennzahl
• Online Access: http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-232005; http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-232005; http://www.qucosa.de/fileadmin/data/qucosa/documents/23200/Muritala%20-%2003112017_Official_1b.pdf

Trace component analysis in gasification processes are important part of elemental component balances in order to understand the fate of these participating compounds in the feedstock. Residual traces in the raw synthesis gas after quench could bring about the poisoning of catalysts and corrosion effects on plant facilities. The objective of this work is to investigate the effects of quenching operation on the trace components during test campaigns of the autothermal non-catalytic reforming of natural gas (Gas-POX) mode in the HP POX (high pressure partial oxidation) test plant. In order to achieve this, Aspen Plus simulation model of the quench chamber of the HP POX test plant was developed to re-calculate the quench chamber input amount of different trace compounds from their output amount measured during test points of the Gas-POX campaigns. Variation in quench water temperatures from 130 °C to 220 °C and pH value of quench water as well as the resulting variation in Henry´s and Dissociation constant of the traces (CO2, H2S, NH3 and HCN) changed the distribution of traces calculated in the quench water. The formation of traces of organic acid (formic acid and acetic acid) and traces of BTEX, PAHs and soot in the quench water effluent were discussed. The discrepancies between equilibrium constant and reaction quotient (non-equilibrium or real) for the formation of NH3 and HCN at the exit of the gasifier were discussed. The assessment of the results in this work should lead to the improvement in the understanding of trace components and concepts that could be employed to influence their formation and reduction.