Hot Discharges/Feeds between Plants To Combine Utility Streams for Heat Integration

Abstract

A sharp increase in worldwide energy requirements has forced people to exploit novel energy conservation technologies and new alternative energies. Heat integration, as a method of saving energy, is proposed in this paper in the form of integrating multiple hot discharges/feeds between plants and utility streams to reduce utility requirements and increase steam production for the total site. T–Q graphic methods are proposed to coordinate the temperatures of multiple hot discharges/feeds between plants and the steam production. The grand composite curve (GCC), the composite curve of the streams employed for hot discharges/feeds, and the curve of steam generation are combined into the T–Q diagram to obtain an insight into the interrelationship between these streams. A bilevel mixed integer linear programming (MILP) framework is presented to minimize the total hot and cold utilities of the up and down plants and to maximize the steam generation in the total site. The first level of the programming framework is formulated to target the utility requirements, and the second level of the programming framework is formulated to maximize the steam production. Two examples are investigated to demonstrate the performance of the proposed method, and the results show a decrease in the total hot and cold utilities of the up and down plants and also indicate an increase in steam production.

Quantitative tools for cultivating symbiosis in industrial parks; a literature review

“…Hipólito-Valencia et al [137] constructed a model for inter-plant trigeneration systems consisting of a steam Rankine cycle, an organic Rankine cycle and an adsorption refrigeration cycle. Adding a heat transfer to a material exchange, by transferring materials while still hot, has been studied with a MILP model to improve HENs [138] and in conjunction with utility systems to increase steam production [139].…”

A multi-period mathematical model for simultaneous optimization of materials and energy on the refining site scale

“…Recently, a retrofit framework for total site heat recovery systems was presented to determine the most cost-effective retrofit options and maximize potential savings, and a petrochemical site was tested [32]. The transshipment model was extended in some works to allow direct hot discharges/feeds between units for heat integration between process units and steam streams [33,34]. Heat integration between processes and utility systems were also investigated for some process industries, such as pulp and paper mill evaporation plants [35,36], juice processing plants [37], and industrial sawmill sites [38].…”

Multiobjective design of interplant trigeneration systems

“…Perry et al incorporated industrial and residential users in the total site energy integration. Klemes et al presented new developments for heat integration in total sites, Hackl and Havey proposed a methodology for energy integration inside an industrial cluster, and Zhang et al integrated the hot discharges/feeds between plants. Recently, the organic Rankine cycle (ORC) has been proposed to recover waste heat (considering the effect of working fluids, analyzing the energetic effects, involving a parametric optimization, an experimental investigation, and an assessment with cogeneration); the ORC is similar to the SRC but using an organic fluid with a lower boiling point.…”