9000 m³/h NMP Exhaust Gas Treatment System for Lithium Battery Production

I. Function Overview

This series of NMP recovery systems utilizes the miscibility of NMP and water to recover exhaust gases emitted from coating machines. The system operates fully automatically, ensuring operational stability and safety. It adopts a three-stage spray absorption design, and the tail gas emission is significantly below the national emission standards. The system includes: ventilation ducts, recovery towers, pump groups, blower, NMP liquid storage tank, and control system. The unit features a high recovery rate, low operating cost, compact and aesthetic design, small footprint, excellent performance, and ease of operation—suitable for various lithium battery production lines during the coating process.

II. System Configuration

1. Air Volume Capacity: 9000 m³/h
Complies with GB 30484-2013 "Emission Standard of Pollutants for Battery Industry" regarding total non-methane hydrocarbon (NMHC) emissions.

2. Main Unit Color: SUS gray.

3. NMP Recovery Equipment Functional Modules:

4. Delivery List:

5. Main Components of 9000 Air Volume NMP Recovery System:

IV. Design Basis and Standards

1. Compliant with national, industry, and local regulations, as well as client requirements. Ensures treated exhaust meets legal and project-specific standards.

2. Employs efficient, energy-saving, and practical treatment processes with the goal of low energy consumption, minimal investment, small footprint, and easy maintenance.

3. Major components and electrical systems use branded and reliable manufacturers.

4. No secondary pollution is generated during construction or operation.

V. Technical Parameters

 

VI. Process Flow

1. Process Diagram(Diagram for reference only)

1. Installation Render(Image for reference only)

VII. NMP Recovery Tower Working Principle

1. The system recovers NMP from exhaust gases via pure water absorption. Waste gas enters from the bottom, where NMP dissolves in water or steam. After absorption, the gas-liquid mixture passes through a separator and then a rinsing unit to remove remaining NMP. As the waste gas is hot, an energy exchange occurs, causing partial evaporation of water. A circulation pump recycles liquid through the absorption unit, improving heat exchange efficiency and increasing recovered NMP concentration. After processing, exhaust can be discharged directly—essentially achieving zero emissions.

 

2. Tower Structure
The tower comprises three main zones:

Spray Heat Exchange Section: Enables rapid mass and heat transfer via direct contact between NMP vapors and water.

Mass Transfer Separation Section: Uses structured packing (140Y) for high-efficiency counter-current absorption.

Demisting Section: Captures mist through inertial impaction and swirl separation, with a demisting efficiency of 90–99%.

 

VIII. Control System

1. Electrical Panel Configuration

No.	Component	Brand	Qty	Remarks
1	Electrical Parts	Chint	1 set
2	Frequency Converter	V&T	1 set
3	NMP Liquid Sensor	Local	1 set	With lens cleaning device
4	Valves	Local	1 set

 

2. Control System Overview

No.	Item	Specification	Remarks
1	Main Control System	Independent outdoor control cabinet, remote start/stop from coater head
2	Operation Modes	Manual, automatic, emergency stop, and remote start/stop
3	Waste Liquid Concentration	Display and configurable value
4	Alarm Functions	Sound and light alarm at coater head and outdoor buzzer alarm
5	Safety Protection	Over-temperature alarm and power-off protection