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论文类型：期刊论文

发表时间：2014-11-01

发表刊物：ENERGY & FUELS

收录刊物：SCIE、EI、Scopus

卷号：28

期号：11

页面范围：7216-7226

ISSN号：0887-0624

摘要：In this paper, a model is established to predict the swelling ratio of high-volatile bituminous coal during pyrolysis, based on the assumption that the structure of bubble distribution in the particle at the beginning of the plastic stage is a central bubble surrounded by many surrounding bubbles. The initial number and size of the bubbles when the particles become plastic are calculated by the pressure in the particle. The chemical percolation devolatilization (CPD) model is used to describe pyrolysis. The pyrolysis of eight types of high-volatile bituminous coals is simulated, and the results are compared with experimental results to verify the model. The particle size during pyrolysis increases then decreases during pyrolysis. The model predicts experimentally observed trends in swelling ratio with heating rate; particle swelling during pyrolysis increases with heating rate, up to similar to 10(4) K/s, and then decreases with further increases in heating rate. Predictions of increasing then decreasing swelling with increases in ambient pressure also agree with trends that have been observed experimentally.