Whitepapers

Next generation of APC technology eliminates controller tuning
5 February 2016

The new Sequential Multi-Objective Optimization (SMO) technology available in Aspen DMC3 is a step change improvement over traditional APC optimizers. The new algorithm enables users to specify APC controller objectives thereby eliminating any LP cost tuning. In this whitepaper learn how advances in APC technology enables engineers to eliminate tuning workflows for the entire lifecycle of the controller.

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Enabling Better Capital Decisions: Six Tips for Faster, Accurate Cost Estimates.
15 January 2016

In today’s competitive marketplace, more efficiently delivering capital projects throughout the project lifecycle can be the difference between profit and loss.

Discover how you can deliver both conceptual and detailed estimates in weeks instead of months and how this enables you to increase competitive edge and responsiveness.

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Water Wash Design Optimization with Simulation and Empirical Evaluation
15 December 2015

Petro-chemical refiners are required to move crude oil great distances throughout the refining process. Crude oil contains various salts which can lead to corrosion or plugging at various stages in the equipment. Water wash is of-ten implemented to scrub the salts from the process stream to mitigate corrosion risks. Two modes of pipe degradation are addressed in this work: acid corrosion and erosion due to high wall shear stress. The primary focus of this study is to define the parameters with largest impact on the reduction of corrosion and erosion. Distribution of injected water wash and downstream behavior of the excess fluid are the focus of this investigation. This study builds on previous empirical and simulation studies of water wash techniques. A hydraulic spray and multiple quill style injectors were investigated with a nominally uniform cross-flow. These results demonstrate the trajectory change as well as the change in spray plume characteristics over a range of spray types and operating conditions, including counter-current and cross-current operation. The experimental results were acquired with a LaVision Laser Sheet Imaging (LSI) and an Artium Phase Doppler Interferometer (PDI), to measure the spray shape, size, distribution characteristics as well as droplet size and velocity. The spray simulations were conducted using ANSYS FLUENT computational fluid dynamics (CFD) package in conjunction with custom spray injection methods developed in-house. Experimental results are compared with the simulation results to indicate the amount of wash water that can be entrained to interact with the gas stream for corrosion mitigation.

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Eliminating Catalyst Cool Down as Critical Path in a Turnaround
15 November 2015

Reducing turnaround duration can dramatically increase refinery profitability. Historically, cooling hydrotreater, hydrocracker, or reformer catalyst has often been on the critical path when maintenance was being performed on those units. This white paper will demonstrate an alternative approach to catalyst cooling that eliminates nitrogen injection and shortens the duration of this task.

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