Black liquor gasification is one of the promising alternatives to
eliminate the drawbacks of the conventional recovery unit of the
kraft process. A numerical model has been developed to simulate an
industrial pilot scale entrained-flow gasifier currently operating at
Tampere, Finland. The objective of the model is to investigate the
effect of the key operating parameters on the efficiency of sulfate
reduction during black liquor gasification. The results of the
sensitivity analysis indicates that reduction is dependent of the ratio
of the amount of carbon in black liquor to the amount of air being
fed into the system, the reactor temperature and the initial particle
size. Decreasing the air ratio can improve the efficiency of reduction.
The rates of both reduction and carbon gasification increase with
increasing in temperature. Higher reduction can be obtained by
increasing the initial particle size. However, the values of those
parameters need to be optimized based on the desired degree of
sulfate reduction and the completion of carbon conversion. Economic
considerations such as the length of the gasifier needed to achieve
both high reduction efficiency and carbon conversion also need to be
considered when selecting operating conditions. / Graduation date: 1994
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/36288 |
| Date | 24 September 1993 |
| Creators | Jivakanun, Narongsak |
| Contributors | Frederick, W. James |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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