Thermal process simulation of reactive particles on moving grates

Moving grate, LEPOL, Particle, Limestone, Decomposition, Clinker, Fluidisation

Post card with a notice of freight arrival addressed to S.D. Woodruff from the Great Western Railway for castings, a keg and grates

Post card with a notice of freight arrival addressed to S.D. Woodruff from the Great Western Railway for castings, a keg and grates, Aug.11, [1876].

The use of coke in open domestic grates,

"Mr. J. S. Hales ... was assisted by Mr. W. C. Moss, B. SC., and the work was supervised by Mr. A. Blackie ..."--p. iii.

Slurry flow in mills: grate-only discharge mechanism (Part-1)

Discharge grates play an important role in determining the performance of autogenous, semi-autogenous and grate discharge ball mills. The flow capacity (grinding capacity) of these mills is strongly influenced by the discharge grate design-open area and position of apertures, as well as the performance of the pulp lifters. As mill sizes have progressively increased and closed-circuiting has become more popular the importance of grate and pulp lifter design has grown. Unfortunately very few studies have concentrated on this aspect of mill performance. To remedy this a series of laboratory and pilot-scale tests were undertaken to study both the performance of grates on their own and in conjunction with pulp lifters. In this first paper of a two-part series the results from the grate-only experiments are presented and discussed, whilst the performance of the grate-pulp-lifter system is covered in the second paper. The results from the grate-only experiments have shown that the build-up of slurry (hold-up) inside the mill starts from the shoulder of the charge, while the toe position of the slurry progressively moves towards the toe of the charge with increasing flowrate. Besides grate design (open area and position of apertures), charge volume and mill speed were also found to have a strong influence on mill hold-up and interact with grate design variables. (C) 2003 Elsevier Science Ltd. All rights reserved.

Servei d'Assesorament Pedagògic

Proposta d’un Servei d’Assessorament Pedagògic dirigit a tots els agents educatius d’un mateix territori. Una metodologia breu on l’usuari és la clau per canviar aquelles situacions conflictives o no grates, amb el suport i l’ajuda d’un equip multidisciplinari, per tal de copsar tots els punts de vista necessaris per fer el canvi

Evaluation of Safety Treatments for Roadside Culverts: TR-517, April 24, 2009

Roadside cross-drainage culverts have been found to impact vehicle accident injury levels. Designers have commonly used three safety treatments to protect errant drivers from culvert accidents. These treatments have included: culvert extension, guardrail installation and grating. In order to define which safety treatment is the most appropriate, benefit-cost analysis has used accident cost reduction to estimate societal gains earned by using any safety treatment. The purpose of this study was to estimate accident costs for a wide range of roadway and roadside characteristics so that designers can calculate benefit/cost ratios for culvert safety treatment options under any particular scenario. This study began with conducting a parametric study in order to find variables which have significant impact on accident cost changes. The study proceeded with highway scenario modeling which included scenarios with different values for combinations of roadway and roadside variables. These variables were chosen based upon findings from the parametric study and their values were assigned based upon highway classification. This study shows that the use of different culvert safety treatments should be flexible to roadway and roadside characteristics. It also shows that culvert extension and grating were the safety treatments found to produce the lowest accident costs for all highway scenarios modeled. Therefore, it is believed that the expanded adoption of culvert extension and culvert grates can improve overall highway safety.

Letter and envelope addressed to S.D. Woodruff from the office of T.B. Stewart and Co. of New York

Letter and envelope addressed to S.D. Woodruff from the office of T.B. Stewart and Co. of New York, Manufacturers of Mantles, Marble and Wood Mantels. The letter states that the heater and grates have been shipped, July 14, 1876.

L’apport des infirmières au processus de consentement aux soins en milieu pédiatrique et enjeux éthiques qui en découlent

Cette recherche, traitera de la perception qu’ont les infirmières, œuvrant en milieu pédiatrique, de leur apport dans le processus de consentement aux soins et des enjeux éthique qui en découlent. L’analyse de leurs commentaires, fait voir une extension de la définition, plus classique, du concept même de consentement, pour y inclure la dimension d’un processus enclenché et poursuivi dans le dialogue et la né-gociation; un consentement sans cesse à répéter, à renégocier. Les participantes ne parlaient guère d’autonomie mais parlent surtout de ce consen-tement aux actes de soins, actes individuels, voire routiniers. Le but recherché par l’infirmière est moins une permission donnée par le patient pour que le soignant fasse son travail en toute immunité sur le plan légal, qu’une collaboration pour permettre une cogestion de la maladie. Très souvent, les infirmières discutent de l’importance qu’a pour elles le travail d’équipe, comme la façon logique de concevoir leur travail. Il devient logique aussi d’étendre aux parents et à l’enfant la participation à l’équipe thérapeutique. Ce n’est pas dire que tout se passe sans heurt. L’enfant peut s’opposer, ou le parent. Les conflits de valeurs surgissent: conflits et détresse morale suscités chez l’infirmière par la confrontation à des croyances et des valeurs culturelles et reli-gieuses différentes de celles auxquelles l’infirmière adhèrerait plus facilement. Mais souvent, l’infirmière fait montre d’une grande sensibilité culturelle et religieuse; et il lui arrive de faire appel à des collègues qui pourraient, plus qu’elle, connaître les sys-tèmes de valeurs qui posent question. Nous nous sommes servi d’un ensemble de référents interprétatifs initiaux à titre d’un cadre conceptuel intégrant des notions tirées du modèle de soins infirmiers de Corbin et Strauss, ainsi que de la perspective proposée par l’interactionnisme symbo-lique.

Servei d'Assesorament Pedagògic

Proposta d’un Servei d’Assessorament Pedagògic dirigit a tots els agents educatius d’un mateix territori. Una metodologia breu on l’usuari és la clau per canviar aquelles situacions conflictives o no grates, amb el suport i l’ajuda d’un equip multidisciplinari, per tal de copsar tots els punts de vista necessaris per fer el canvi

Varios discursos eloquentes y politicos sobre las acciones mas heroycas de diferentes personages antiguos o modernos... [y otras obras] /

Mode of access: Internet.

Slurry flow in mills with TCPL - An efficient pulp lifter for ag/sag mills

The difficulties associated with slurry transportation in autogenous (ag) and semi-autogenous (sag) grinding mills have become more apparent in recent years with the increasing trend to build larger diameter mills for grinding high tonnages. This is particularly noticeable when ag/sag mills are run in closed circuit with classifiers such as fine screens/cyclones. Extensive test work carried out on slurry removal mechanism in grate discharge mills (ag/sag) has shown that the conventional pulp lifters (radial and curved) have inherent drawbacks. They allow short-circuiting of the slurry from pulp lifters into the grinding chamber leading to slurry pool formation. Slurry pool absorbs part of the impact thus inhibiting the grinding process. Twin Chamber Pulp Lifter (TCPL) - an efficient design of pulp lifter developed by the authors overcomes the inherent drawbacks of the conventional pulp lifters. Extensive testing in both laboratory and pilot scale mills has shown that the TCPL completely blocks the flow-back process, thus allowing the mill to operate close to their design flow capacity. The TCPL performance is also found to be independent of variations in charge volume and grate design, whereas they significantly affect the performance of conventional pulp lifters (radial and curved). (c) 2006 Elsevier B.V. All rights reserved.

Prediction of slurry transport in SAG mills using SPH fluid flow in a dynamic DEM based porous media

DEM modelling of the motion of coarse fractions of the charge inside SAG mills has now been well established for more than a decade. In these models the effect of slurry has broadly been ignored due to its complexity. Smoothed particle hydrodynamics (SPH) provides a particle based method for modelling complex free surface fluid flows and is well suited to modelling fluid flow in mills. Previous modelling has demonstrated the powerful ability of SPH to capture dynamic fluid flow effects such as lifters crashing into slurry pools, fluid draining from lifters, flow through grates and pulp lifter discharge. However, all these examples were limited by the ability to model only the slurry in the mill without the charge. In this paper, we represent the charge as a dynamic porous media through which the SPH fluid is then able to flow. The porous media properties (specifically the spatial distribution of porosity and velocity) are predicted by time averaging the mill charge predicted using a large scale DEM model. This allows prediction of transient and steady state slurry distributions in the mill and allows its variation with operating parameters, slurry viscosity and slurry volume, to be explored. (C) 2006 Published by Elsevier Ltd.