# The Application of Pinch Technology to a Novel Closed-Loop Spray Drying System with a Condenser and Reheater

## TL;DR

This paper explores using pinch technology in a closed-loop spray drying system to significantly improve energy efficiency and reduce environmental impact.

## Contribution

The study introduces a novel closed-loop spray drying system with an air reheater that achieves substantial energy savings.

## Key findings

- The system achieved a very low approach temperature of 3.48 K.
- Heat-recovery components reduced external heating demand by up to 30%.
- The system offers a scalable solution for energy efficiency in industrial applications.

## Abstract

Spray drying is an energy-intensive process in industrial use, making energy recovery a critical focus for improving overall efficiency. This study investigates the potential of integrating heat-recovery systems, including an innovative air reheater, into a closed-loop spray-drying unit to maximise energy savings. Through detailed pinch analysis, the system achieved a very low approach temperature, averaging 3.48 K, which is significantly lower than that of conventional open-loop systems. The study quantifies the energy-recovery potential by demonstrating that the integration of heat-recovery components can reduce the external heating demand by up to 30%. This not only enhances heat-transfer efficiency but also lowers operational costs and reduces the system’s environmental impact. The results suggest that closed-loop systems with air reheaters offer a scalable solution for improving energy efficiency across different industrial applications. The research highlights a new paradigm: focusing on latent energy within the system rather than adjusting individual operational variables.