Untersuchungen zur chemischen Heißgasreinigung bei der Hochtemperaturkohlevergasung

Nowadays, the IGCC prozess is the most efficient technique for power generation. However, there are many process steps which cause tremendous losses in efficiency. The highest losses occur during the cooling of the flue gas required for the gas cleaning. A reduction of loss in efficiency can be achieved by a continuous hot gas cleaning at elevated temperatures without any intercalated flue gas cooling steps. The german project HotVeGas deals with an IGCC process including a high temperature coal gasification and a high temperature flue gas cleaning. The important steps in the recent hot gas cleaning are removal of slag, retention of gaseous alkalis and CO conversion together with hydrogen separation by a high temperature shift catalyst membrane. The removal of alkalis is predominant because condensates of alkali metal salts can demage components in the power plant. Therefore, the essential aim is to keep the alkali concentration at low values. The concept of a removal of alkali at high temperatures is based on sorption in aluminosilicates and forming glass melts. In this regard, materials with a high sorption capacity under prevailing conditions are required. Furthermore, there is a great demand for operational CO catalysts. Within the context of an overall view of the considered IGCC process thermochemical model calculations were performed to estimate the gas purity after alkali removal under reducing conditions. The parameters of interest were coal composition, gasifying agent und system pressure. The resulting gas composition was then used to determine the condensation temperatures of alkaline salts. In addition, thermochemical stabilities of shift catalysts under reducing conditions were calculated. In consideration of the sorption capacity of aluminosilicates at high temperatures in reducing atmosphere sorption tests were performed at 1400 and 1500°C.

Grantor dc:publisher

Publikationsserver der RWTH Aachen University

Year dc:date

2012

Author dc:creator

• Waindich, Arleta Barbara

Contributors dc:contributor

• Singheiser, Lorenz

• info:eu-repo/classification/ddc/620
• Heißgasreinigung
• Kohlevergasung
• Alkalien
• Kohlekraftwerk
• Ingenieurwissenschaften
• IGCC
• Hochtemperaturkohlevergasung
• Alkalienreinigung
• high temperature coal gasification

Statement dc:rights

• info:eu-repo/semantics/openAccess

Language dc:language

ger

Identifier

https://publications.rwth-aachen.de/search?p=id:%22RWTH-CONV-113884%22

OAI record oai:identifier

https://publications.rwth-aachen.de/oai2d?verb=GetRecord&metadataPrefix=oai_dc&identifier=oai%3Apublications.rwth-aachen.de%3A51609