Modeling of Coal Drying before Pyrolysis

Progress in Coal Pyrolysis Research

The factors considered are summarized in Table 1. The problem of answering the questions is that multiple chemical reactions occur whose results depend on how the reactants are bound in the coal macromolecular network. Species-selective transport of the reactants and products further complicate the interpretations. In what follows, we have tried to focus on topics where answers are needed or wh...

Organic emissions from coal pyrolysis: mutagenic effects.

Four different types of coal have been pyrolyzed in a laminar flow, drop tube furnace in order to establish a relationship between polycyclic aromatic compound (PAC) evolution and mutagenicity. Temperatures of 900K to 1700K and particle residence times up to 0.3 sec were chosen to best simulate conditions of rapid rate pyrolysis in pulverized (44-53 microns) coal combustion. The specific mutage...

System for Drying Coal Using Hot Circulating Water From Condenser RESEARCH DEMONSTRATES BENEFITS OF DRYING WESTERN COAL

System for Drying Coal Using Hot Circulating Water From Condenser RESEARCH DEMONSTRATES BENEFITS OF DRYING WESTERN COAL

Over the last several decades, the US electric utility industry has come to rely, increasingly, on Powder River Basin coals (PRB) and lignite for electric power generation. This increase in the use of these fuels stems, in part, from their being relatively inexpensive and low in sulfur. However, both types of fuel are high in moisture—25 to 40% for lignite and 15 to 30% for PRB – and this resul...

Modeling Spray Pyrolysis Deposition

The deposition of a thin tin oxide film allows for the manufacture of modern gas sensors. Spray pyrolysis deposition is used to grow the required thin films, as it can be seamlessly integrated into a standard CMOS processing sequence. A model for spray pyrolysis deposition is developed and implemented within the Level Set framework. Two models for the topography modification due to spray pyroly...