Agglomeration of Bed Particles in Low-Temperature Black Liquor Gasification Agglomeration of Bed Particles in Low-Temperature Black Liquor Gasification
One of the reasons why steam reformers are not reliable is due to the agglomeration of the particles in the fluidized bed. The particles will stick together, agglomerate, at temperatures much lower than their melting temperature. The strength of these bonds and the temperature at which the bed agglomerates were studied as well as the effect of particle size on the heat transfer coefficient from the heaters to the bed material by means of experimentation and analysis.
As the carbon content decreases, the agglomeration temperature also decreases. For 0.3% carbon content coated particles, the agglomeration temperature is approximately 490 ÂºC. The temperature at which the inter-particle bond strength increases dramatically also decreases. By comparing the inter-particle force with the collision force between particles, it was observed that when the velocity of the particles decreases below 1/500th of the free stream velocity, the particles will agglomerate.
School:Brigham Young University
School Location:USA - Utah
Source Type:Master's Thesis
Keywords:fluid bed black liquor defluidization agglomeration sintering fluidization
Date of Publication:10/12/2006