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Insight into the effects of additive water on caking and coking behaviors of coal blends with low-rank coal
- Source :
- Fuel. 238:10-17
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- Additive water is usually needed to preserve 9β11% moisture content of blended coal in the stamp-charging coking process, which in fact is unfavorable for coking property. An insight into the improvement of coking property of coal blends with much low-rank coal (long flame coal SFC, lignite HLH) by regulating additive water was proposed in terms of its effects on the metaplast fluidity and the particle agglomeration behavior. The results indicate that the cohesiveness of gas coals (GC) can be properly enhanced by adding water. The restrictions on the condensation of aromatic structures and the break-up of βCH2β structure and the development of the polyhydroxy groups in aromatic structures are favorable to increase the fluidity of metaplast after adding water, as demonstrated by the optical texture and FTIR analysis of the semicoke (450 °C). The great difference in the hydrophilic properties for various rank coals leads to the particle agglomeration of gas coal and fat coal (GC and FC), which makes them difficult to mix uniformly with SFC after adding water, thus reduces the coking property. A reasonable approach of adding water suggests that H2O and SFC should be well mixed prior to blending with caking coals, which can lead to a uniform particle distribution and a better coking property. This approach promotes the direct and efficient utilization of low-rank coal (especially lignite) by the blending coking with no or less drying and dewatering processes.
- Subjects :
- Materials science
Economies of agglomeration
business.industry
020209 energy
General Chemical Engineering
Organic Chemistry
Condensation
technology, industry, and agriculture
Energy Engineering and Power Technology
02 engineering and technology
complex mixtures
Dewatering
respiratory tract diseases
Fuel Technology
Caking
020401 chemical engineering
Chemical engineering
otorhinolaryngologic diseases
0202 electrical engineering, electronic engineering, information engineering
Particle
Coal
0204 chemical engineering
business
Water content
Subjects
Details
- ISSN :
- 00162361
- Volume :
- 238
- Database :
- OpenAIRE
- Journal :
- Fuel
- Accession number :
- edsair.doi...........5005370586c3c46d8d9580bad05e78e2