Pyrolysis and gasification of coal at high temperatures

Abstract

The macropore structure of chars is a major factor in determining their reactivity during tL_e gasification stage. The major objectives of this contract were to (a) quantify by direct measurements the effect of pyrolysis conditions of the macropore structure, and , (b) establish how the macropores affected the reactivity pattern, the ignition behavior and the fragmentation of the char particles during gasification in the regime of strong ditTusional limitations. Results from this project provide much needed information on the factors that affect the quality of the solid products (chars) of coal utilization processes (for example, mild gasification prcx-,esses). The reactivity data will also provide essential parameters for the optimal design of coal gasification processes.

Reaction-diffusion degradation model for delayed erosion of cross-linked polyanhydride biomaterials

“…Earlier modeling work [6][7][8][9][10][11][12][13][14][15][16]30 on bulk and surface eroding polymers does not provide tools for understanding the long water-intake interval for the recently developed cross-linked amorphous polyanhydrides. 17,18,31,32 Figure 1 illustrates results of our successful modeling approach, reported here.…”

“…[1][2][3][4][5] The use of modeling allows for a better understanding of the degradation and erosion mechanisms of different polymeric biomaterials. [6][7][8][9][10][11][12][13][14][15][16] Here we report a modeling approach aimed at explaining a recently experimentally found 17,18 long induction time of water intake preceding the onset of erosion in cross-linked polyanhydrides synthesized via thiol-ene polymerization. This property is important because it enables additional control in applications, such as drug release.…”