Engineering Commons^™

Obliczanie Emisji Par Węglowodorów Z Przemysłu Rafineryjnego, Marian Mazur, Robert Oleniacz, Marek Bogacki

Robert Oleniacz

The negative effects of the refining industry for ambient air quality is mainly related to emissions of hydrocarbon vapors. Calculation methodology and estimates, the level of emissions from several years has been the research subject of many institutions and environmental agencies, including The Oil Companies’ European association for health, safety and environment in refining and distribution (CONCAWE) and American Petroleum Institute (API).

The article describes the main sources of emissions of hydrocarbons occurring in a typical refinery. In summary form also shows how to calculate the volume of a mixture of hydrocarbons emissions from these sources based on empirically validated …

Studies Of Multitubular Reactors With Internal Heat Recovery. Experiments With So2 Oxidation, Krzysztof Gosiewski, Ryszard Sztaba, Marek Moszczynski

Krzysztof Gosiewski

The paper presents results of investigations of a multitubular reactor with internal heat recuperation. The results obtained were similar to those occuring in the reverse-flow reactors.

An O(N) Algorithm For Stokes And Laplace Interactions Of Particles, Ashok S. Sangani, Guobiao Mo

Ashok S. Sangani

A method for computing Laplace and Stokes interactions among N spherical particles arbitrarily placed in a unit cell of a periodic array is described. The method is based on an algorithm by Greengard and Rokhlin [J. Comput. Phys. 73, 325 (1987)] for rapidly summing the Laplace interactions among particles by organizing the particles into a number of different groups of varying sizes. The far-field induced by each group of particles is expressed by a multipole expansion technique into an equivalent field with its singularities at the center of the group. The resulting computational effort increases only linearly with N. The …

Simple Shear Flows Of Dense Gas-Solid Suspensions At Finite Stokes Numbers, Ashok S. Sangani, Guobiao Mo, Heng-Kwong Tsao, Donald L. Koch

Ashok S. Sangani

We examine the problem of determining the particle-phase velocity variance and rhe-ology of sheared gas-solid suspensions at small Reynolds numbers and finite Stokes numbers. Our numerical simulations take into account the Stokes flow interactions among particles except for pairs of particles with a minimum gap width comparable to or smaller than the mean free path of the gas molecules for which the usual lubrication approximation breaks down and particle collisions occur in a finite time. The simulation results are compared to the predictions of two theories. The first is an asymptotic theory for large Stokes number St and nearly elastic …