Low potential heat utilization of bromine plant via integration on process and Total Site levels

• Estimation of energy saving potential of bromine production site.
• Pinch analysis of bromine and sodium bromide productions.
• Design of heat exchangers networks.
• Low potential heat utilization by Total Site heat recovery.
• Calculation of economic indicators for retrofit projects.

In this paper, the energy efficiency of bromine production site is analysed and pathways for heating and cooling demands reduction are proposed. Detailed inspection of the process stream system and heat integration on process and site levels was performed. The enterprise capacity is 25 t/d of sodium bromide crystals and 27 t/d of liquid bromine, the concentration of bromine ion in the raw material is 0.8–1 g/L. The PA (Pinch Analysis) and TSA (Total Site Assessment) were used for estimation of energy saving potential and design of retrofit project. Heat recovery on site level is performed by intermediate utility applying Total Site Profiles. Structure of heat recovery system and minimal temperature difference are determined. It is shown that the process with improved heat integration consumes 57% of hot and 97% of cold utilities required by existing production site.