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논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 발행연도
- 1990.5
- 수록면
- 11 - 17 (7page)
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This paper considers tho effect of internally generated thermal stresses on the burning behavior of crushed coal particels(d_m=250 ㎛, ＜ 1 ㎜) in non-slagging cyclone combustors.
Considerable temperature gradients are generated within each coal particle especially in the initial heat period. The resulting thermal stresses so generated indicates that very high tensile stresses occur in the central region with high compressive stresses at the surface. Data for the failure strengths of coal were extrapolated from mining engineering work and were then used to assess the probability of internal failure of coal particels under the conditions discussed. It was clearly demonstrated that most coal particles greated than 100 ㎛ would fail internally due to thernal stresses.
Depending on the coal type a decreasing probability of failure/internal structural modification would occur down to 25 ㎛ particles especially due to tension/thernal stress failure in the central region. These concepts lead to the postulation of a model for the internal structure of coal particles as modified by thermal stresses.
Considerable temperature gradients are generated within each coal particle especially in the initial heat period. The resulting thermal stresses so generated indicates that very high tensile stresses occur in the central region with high compressive stresses at the surface. Data for the failure strengths of coal were extrapolated from mining engineering work and were then used to assess the probability of internal failure of coal particels under the conditions discussed. It was clearly demonstrated that most coal particles greated than 100 ㎛ would fail internally due to thernal stresses.
Depending on the coal type a decreasing probability of failure/internal structural modification would occur down to 25 ㎛ particles especially due to tension/thernal stress failure in the central region. These concepts lead to the postulation of a model for the internal structure of coal particles as modified by thermal stresses.
목차
Summary
Contents
Results and Discussion
Conclusions
References
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UCI(KEPA) : I410-ECN-0101-2009-563-018201704