Showing papers by "Ana Paula Barbosa-Póvoa published in 2003"
TL;DR: This paper presents a mathematical formulation for the detailed design of multi-purpose batch process facilities where heat-integration and economic savings in utilities are considered and the applicability of this model is shown via the solution of some illustrative examples.
Abstract: The increasing importance of utilities rationalization is an aspect that must be addressed from the early steps of the industrial design procedure. This paper addresses this problem and presents a mathematical formulation for the detailed design of multi-purpose batch process facilities where heat-integration and economic savings in utilities are considered. This generalization appears as an extension of the work of Barbosa-Povoa et al. [3] where some important design aspects were not considered. In particular, no consideration was given to the economic savings in utility requirements, while considering both the cost of the auxiliary structures (i.e. heat-exchanger through their transfer area) and the design of the utility circuits and associated piping costs. These aspects can appear quite relevant at the design level if the connectivity cost and consumption utilities account for a significant share of capital investment within the plant budget. Also, and at the operational level, heat-integration considerations often result in important plant savings. The problem is formulated as a Mixed Integer Linear Problem (MILP) where binary variables are introduced to characterise operational and topological choices, and continuous ones define the equipment capacities, as well as the amounts of material within the overall process. The applicability of the proposed model is shown via the solution of some illustrative examples.
34 citations
TL;DR: In this article, an optimisation model for the management of the recovery of residual products originated at industrial plants is presented, which aims at maximizing the quantity of sludge processed and reflecting the trade-off between the cost for its disposal, processing, transport and storage, while accounting for the limits imposed in the environment pollutants associated.
Abstract: The present work describes an optimisation model for the management of the recovery of residual products originated at industrial plants. The mSTN (maximal State Task Network) representation is used as the modelling framework for the general proposed network superstructure where all possible process transformations, storage, transports and auxiliary operations are accounted for. This is combined with the evaluation of a set of environmental impacts (EI), quantified by metrics (for air, water pollution, etc.) through the minimum environment impact analysis (MEIM) methodology and associated with waste generation at utility production and transportation levels. The final model is described as a MILP, which, once solved, is able to suggest the optimal processing and transport routes, while optimising a given objective function and meeting the design and environmental constraints. A motivating example based on the recovery of the sludge obtained from Aluminium surface finishing plants is explored. This aims at maximizing the quantity of sludge processed and reflects the trade-off between the cost for its disposal, processing, transport and storage, while accounting for the limits imposed in the environment pollutants associated.
4 citations
TL;DR: This paper looks into the design problem by earch of the three types of representation, STN, m-STN and RTN, with a goal to establish their relative merit and derive a set of guidelines concerning their applicability.
Abstract: This paper looks into the design problem by earch of the three types of representation, STN, m-STN and RTN, with a goal to establish their relative merit and derive a set of guidelines concerning their applicability. From this analysis it was also possible to identify aspects of design, which require further research and a number of recommendations is put forward to this effect. Some cases are described illustrating the flexibility and the applicability of the three types of representation, along with their numerical results.
4 citations