Characteristics of Coal Partial Gasification on a Circulating Fluidized Bed Reactor

Experiments of coal partial gasification are conducted on a self-designed circulating fluidized bed (CFB) gasifier. The CFB gasifier system consists of a furnace, coal-feed system, air-feed system, steam generation system, gas–solid separation system, temperature- and pressure-measuring system, and material-returning system. The furnace is surrounded with electric heating wires, and the height and diameter of the furnace are 2600 and 120 mm, respectively. The experiments are conducted at temperatures between 885 and 980 °C. The coal particle size of 0.35–0.9 mm is chosen for experiments. The coal particle is gasified in the mixture of O2 and steam. The effects of different oxygen/coal ratios and steam/coal ratios on the performance of coal partial gasification are studied. As the results show, a higher oxygen/coal ratio leads to a higher gasification temperature and carbon conversion, while a slightly higher steam/coal ratio is better for the quality of syngas. The results show that the volume fraction of...