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| Titel |
Self-sustaining Carbamide production using the UCG-CC-Urea process |
| VerfasserIn |
Natalie Nakaten, Thomas Kempka, Ralph Schlüter, Jörg Hamann, Rafig Azzam |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250045794
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| Zusammenfassung |
| World-wide coal reserves have an energy supply potential of several hundred years. Deep
lying seams as well as structural problems of the coal-bearing layers can strongly restrict the
mining exploitation of these coal seams. Taking these circumstances into account,
underground coal gasification (UCG) offers an economic and sustainable approach to coal
conversion and utilization as syngas. The high caloric synthesis gas, composed mainly of
methane, hydrogen and carbon dioxide, can be used for electricity generation in a
Combined Cycle Power Plant (CC) or for feedstock production making use of its various
chemical components. In this context, the Urea process can be applied to produce the
nitrogen based fertilizer Carbamide (CH4N2O). Raw materials required for the
production of Carbamide fertilizer can be supplied by the syngas produced in the UCG
process.
The aim of the present study is to develop an integrated carbon utilization concept on the
basis of a combined UCG-CC-Urea process. A significant amount of carbon dioxide from the
UCG syngas is consumed during the Carbamide production process, whereas excessive CO2
can be injected into the gasified coal seams. Gasified coal seams have high porosity and
enhanced adsorption capacity toward CO2. Thus, a new approach to utilize carbon dioxide
resulting from coal combustion was developed. Based on a self-sufficient power supply, the
coupled technology offers the integration of geological storage of excessive carbon
dioxide.
A theoretical feasibility study, taking into account economics and potentials of UCG as
well as the storage of carbon dioxide in the gasified layers, was performed for a selected
study area in Northern Bangladesh. The results of the calculations show that the combined
UCG-CC-Urea-CCS technology offers high competitiveness on international feedstock
markets. |
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