Appropriate placement of vapour recompression in ultra-low energy industrial milk evaporation systems using Pinch Analysis

Abstract

a b s t r a c tThis study focuses on applying Pinch Analysis to an industrial milk evaporator case study to quantify the potential energy savings. Modern milk evaporators are typically integrated using both mechanical and thermal vapour recompression technologies as the primary means for attaining a high level of energy efficiency. A significant step change in energy efficiency for milk evaporators is achieved in this study by appropriate placement of vapour recompression in a new improved two-effect milk evaporation system design. The Grand Composite Curve helps identify areas for process modifications and placements of vapour recompression that result in energy reduction. In particular, the innovative placement of Mechanical Vapour Recompression in the system unlocks significant energy, energy cost, and emissions savings. The new design requires 78% less steam (6397 kW) at the expense of 16% (364 kW ele ) more electricity use. The estimated cost savings associated with the improved design is $942,601/y and the emissions reduction is 3416 t CO 2 -e/y. Further energy efficiency improvements and cost savings of $1,411,844/y are gained through improved Total Site Heat Integration through recovery of waste heat from the dryer exhaust air and boiler return condensate streams.

Avaliação Energética E Simulação De Sistemas De Evaporação Com Recompressão De Vapor Em Uma Indústria De Leite

“…Liew et al (2014), Walmsley (2016), Walmsley et al (2016) também sugerem uma maior utilização de recompressores de vapor nos sistemas de evaporação. Esta proposta de otimização do processo de evaporação gera grande alteração no design atual, porém, como a indústria tem planejamento de expansão da sua produção, este sistema poderia ser instalado operando XII Congresso Brasileiro de Engenharia Química em Iniciação Científica UFSCar -São Carlos -SP 16 a 19 de Julho de 2017 paralelamente ao sistema antigo, a fim de aumentar a produção e obter ganhos energéticos e econômicos ao processo.…”

Achievements and Perspectives of Process Integration in Cis Countries

“…PI plays a key role in such global trends as energy transition [49], industry digital transformation [50], and the circular economy [51]. Some of the applications include cement production in Croatia [52,53], chemical production in Sweden's largest chemical site [54], oil refining [55,56], coke and chemical production in Ukraine [57,58], steel manufacturing [59], natural gas and refining and utilization [60], biofuel production applying distillation and pervaporation [61], milk production [62], and cheese manufacturing [63].…”

Energy optimization in parallel/cross feed multiple-effect evaporator based desalination system

“…Linnhoff and Flower [26] developed an algebraic method, called Problem Table Algorithm [24] represented MEE in the form of GCC and developed mathematical results to minimize the energy consumption of MEE. Recently, Walmsley et al [28] demonstrated that significant energy may be conserved by appropriately integrating vapor compression system with MEE using GCC. In this paper the principles of process integration, combined with the mathematical techniques, are used to calculate the optimal feed flow rate for parallel/cross feed flow system and minimize the energy consumption of MEE.…”