14 research outputs found
Application of Pinch Technology in Refinery Retrofits
This paper reviews the application of pinch
technology in the identification of the most
attractive retrofit prospects in typical
refineries. In the first part of the paper,
methodology is described to identify attractive
inter-unit heat integration opportunities as well
as attractive process-utility system integration
(co-generation). An example of an atmospheric
pipestill-alkylation unit integration evaluation
is given using both composite stream and Grand
composite stream methods. In the second part of
the paper, the application of pinch technology in
a typical intra-unit heat integration problem is
given. It is explained how inefficiencies in an
APS crude preheat train are identified, and a
typical small retrofit project is described
MAGNETIC FIELD ASSISTED FLUIDIZATION – A UNIFIED APPROACH Part 1. Fundamentals and relevant hydrodynamics of gas-fluidized beds (batch solids mode)
The effect of interparticle forces on fluidization regimes in the magnetized fluidized beds
Application of Oxygen-Enriched Aeration in the Conversion of Glycerol to Dihydroxyacetone by Gluconobacter melanogenus
MAGNETIC FIELD ASSISTED FLUIDIZATION – A UNIFIED APPROACH Part 2. Solids Batch Gas-Fluidized Beds: Versions and Rheology.
Effects of Particle Shape and Size Distribution on Sorption and Flow Performance in Electrically Stabilized Expanded Beds
Investigation of agglomeration and defluidization during spouted-bed gasification of high-sodium, high-sulfur South Australian lignite
The mechanisms of agglomeration and defluidization during the fluid-bed gasification of an Australian low-rank coal are investigated. Experiments were conducted in a 77 mm inner diameter spouted-bed gasifier with a high-sodium, high-sulfur coal from the Lochiel deposit in South Australia. The effect of the bed temperature, air/fuel ratio, and superficial velocity on the stable operation of the spouted bed over a 4 h period was investigated. The results of this study indicate that stable bed operation is governed by a "high-temperature defluidization limit", suggesting that defluidization can be delayed or avoided by operating the bed with high superficial velocity and/or low bed temperatures. In experiments that resulted in agglomeration and in some experiments that did not, the average particle size within the bed material had increased, which was mainly attributed to coating of mineral particles. These coated particles were observed to be more prevalent in runs that led to defluidization of the bed. Particle growth also coincided with the increased inorganic content of the bed compared to stable runs. Agglomeration and defluidization may hence be avoided or delayed by operating the bed below about 850 °C, increasing the superficial velocity of gas within the bed, or maintaining the ash content of the bed below approximately 80%, where possible. © 2011 American Chemical Society.Daniel P. McCullough, Philip J. van Eyk, Peter J. Ashman, and Peter J. Mullinge