Views: 0 Author: Site Editor Publish Time: 2026-07-20 Origin: Site
This article shares a practical industrial application case of CST customized SUS316L plate fin gas-gas heat exchanger, serving a large 10GWh power battery manufacturing base in East China. The project targets the high energy consumption, low solvent recovery efficiency and high operating cost of the cathode coating & drying process.
The customer’s production line is equipped with high-speed double-layer coating machines, with a total exhaust air volume of 65,000m³/h. Before renovation, the high-temperature NMP-containing waste gas was directly sent to the condensation unit without pre-cooling, resulting in huge heat waste, high refrigeration load, and severe NMP solvent loss. By installing CST dedicated NMP waste heat recovery gas-gas heat exchanger, the client realized energy saving + solvent recovery + safe production triple benefits with a short investment payback cycle.
The lithium battery cathode drying process continuously discharges 80–120℃ hot waste gas mixed with NMP vapor. The original system had multiple industry-wide pain points restricting profit margins:
High energy consumption: Ambient fresh air at 25℃ required full heating by electric heaters and steam boilers, leading to extremely high continuous operation energy consumption.
Low NMP recovery efficiency: Undercooled hot exhaust gas entered the condenser directly, resulting in insufficient condensation effect, with the original NMP recovery rate only 82%.
Unstable operation: Ordinary aluminum heat exchangers were corroded by long-term NMP organic vapor, causing air leakage and cross-contamination risks, affecting workshop cleanliness and battery yield.
High refrigeration load: High-temperature exhaust increased the operating pressure of the post-stage freezing unit, raising equipment failure rate and maintenance costs.
Combined with the client’s actual air volume, temperature parameters and on-site layout, CST R&D and engineering team designed a large-flow SUS316L anti-corrosion plate fin gas-gas heat exchanger tailored for 65,000m³/h working conditions, adopting full counter-flow heat transfer and completely isolated dual-channel structure.
Key Customized Design Highlights
- NMP anti-corrosion upgrade: The entire heat exchange core adopts SUS316L stainless steel, effectively resisting long-term erosion of high-temperature NMP organic vapor, solving the corrosion and air leakage problems of traditional aluminum heat exchangers.
- Full isolated air duct: Fresh air and waste gas operate in independent sealed channels with zero cross-contamination, ensuring the cleanliness of electrode coating raw materials and meeting lithium battery high-standard production requirements.
- Anti-blocking turbulence fin: Optimized corrugated fin structure enhances air turbulence, avoids cathode powder adhesion and dust accumulation, and reduces manual maintenance frequency.
- Safe sensible heat recovery: Strictly control the exhaust outlet temperature above NMP dew point, no liquid condensation inside the exchanger, avoid internal scaling and corrosion accumulation, and extend equipment service life.
Customer Feedback
“We have upgraded 3 coating production lines with CST’s gas-gas heat exchangers. The equipment runs stably all year round, with no blockage or air leakage problems. The energy saving and NMP recovery benefits are very obvious, and the investment is recovered in only 9 months. CST’s professional customization and after-sales service are highly trustworthy.”
— Factory Engineering Director, 10GWh New Energy Battery Manufacturing Base
This 65,000m³/h large-flow NMP waste heat recovery case fully verifies the reliability and economy ofCST SUS316L plate fin gas-gas heat exchanger in the lithium battery industry. Different from ordinary civil heat recovery equipment, our industrial-grade heat exchangers are specially optimized for high-temperature organic waste gas, corrosion resistance, high airtightness and anti-blocking scenarios, perfectly adapting to the harsh working conditions of battery coating workshops.
This solution is widely applicable to:
- New construction and energy-saving renovation of lithium battery cathode coating drying lines
- NMP solvent waste gas heat recovery and condensation pretreatment systems
- High-flow industrial drying oven waste heat recovery projects
- New energy factory VOC waste gas treatment and energy-saving transformation
