SYNTHESIS OF HEAT EXCHANGER NETWORKS CONSIDERING STEAM SUPPLY
- Details
- Category: Uncategorised
- Published: Monday, 24 January 2022 08:49
- Written by Administrator
- Hits: 1342
Volume 9 (1), January 2022, Pages 29-37
1Lale Haciyeva, 2Natig Abbasov, 3Murad Rzayev
1Dosent, department of “Industrial Machines”, Azerbaijan State Oil and Industry University, candidate of technical sciences, Azerbaijan. E-mail: lala.hacıThis email address is being protected from spambots. You need JavaScript enabled to view it.
2Assistant, department of “Industrial Machines”, Azerbaijan State Oil and Industry University, candidate of technical sciences, Azerbaijan. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
3Operator, “Azeristiliktadjizat” OJSC, graduate student, Azerbaijan State Oil and Industry University, Azerbaijan. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.
ABSTRACT
In process industries, the heating gap in heat exchanger networks (HENs) is normally compensated by the steam generated from a utility system, thus these two mutually influencing systems should be designed as a whole through establishing structural interrelationships. In this work, an improved stage-wise superstructure of HENs is proposed to integrate with a Rankine cycle-based utility system. Inner- and inter-stage heaters are considered in the new structure. Furthermore, the selection of steam in different levels is also investigated, extending the possibilities of steam utilization in HENs and generation in utility systems. The presented methodology is able to realize the optimal design of HENs by considering the supply and utilization of steam. Heaters’ allocations, matches of streams, steam distribution and utilization are optimized accompanying with the trade-off amongst equipment investment, fuel consumption and power generation in objective, which is highly related to the final structure of the system. The optimization problem is formulated into a mixed-integer non-linear programming (MINLP) model and solved towards the lowest total annual cost (TAC) of the entire system. Finally, a case study with two scenarios is studied. The detailed results are given and analyzed to demonstrate the benefit from structural improvement.
Keywords: improved superstructure; HENs; utility system; steam heater; MINLP.