1500 m³/h NMP Solvent Recovery System for Battery Pilot Production Line

I. System Function

This series of NMP recovery systems leverages the miscibility of NMP and water to treat and recover exhaust gases emitted from coating machines. The system is fully automated to maintain stable NMP concentration and TVOC levels in the exhaust air. Designed as an integrated system, it ensures operational stability and safety, while meeting national and local environmental protection standards. The system includes: spray tower, pump group, blower, ventilation ducts, and electrical control system. With a high recovery rate, low operating costs, compact and aesthetic structure, and excellent performance, it is easy to operate and ideal for coating processes in lithium battery laboratory production lines.

 

II. System Configuration

1. Air Volume Handling Capacity: 1500 m³/h, Model TMAX-NMP-1500FL;
Complies with the emission limits for total non-methane hydrocarbons under GB 30484-2013 Emission Standard of Pollutants for Battery Industry.

 

2. Main Unit Color: SUS gray.

3. Functional Modules Overview:

No.	Module	Description
1	Spray Tower	Recovers NMP vapors through water washing and ensures emission compliance.
2	Pump Group	Circulates water within the tower and discharges liquids.
3	Blower	Supplies air to the tower and maintains positive pressure in the coater.
4	Ventilation Duct	Connects the coating machine exhaust port to the recovery tower.
5	Control System	Realizes automation between the recovery system and the coating machine.

 

IV. Design Basis and Standards

Design Principles:

1. Compliant with national, industrial, and local regulations as well as customer requirements; ensures the treated exhaust meets all applicable standards.

2. Adopts efficient, energy-saving, and easy-to-implement processes with goals of low energy consumption, low investment, minimal footprint, and simplified maintenance.

3. Utilizes branded, high-quality equipment and components for reliability.

4. Ensures no secondary pollution is generated during installation or operation.

 

V. System Design Parameters

Parameter	Specification
Recovery System Model	TMAX-NMP-1500FL
Max Exhaust Treatment Capacity	2000 m³/h
Equipment Dimensions	1.6m (L) × 1.2m (W) × 1.6m (H)
Material	SUS304
Power Supply	380V / 3 Phase / 50Hz
Installed Power	3KW (1.5KW circulation pump + 1.5KW fan)
Operating Weight	0.48 tons
Solvent Recovery Rate	≥ 90%
NMP Recovered Liquid Concentration	≥ 80%
Tail Gas Emission Concentration	≤ 50 mg/m³
Water Evaporation Rate	≤ 0.015 m³/h

 

VI. System Image and Working Principle (Images for reference only)

1. Equipment Image: 

2. Working Principle:
The system recovers NMP from exhaust gases through soft water absorption. Waste gas enters from the bottom of the tower and passes through the adsorption unit, where NMP dissolves into water and steam. The treated gas then passes through a gas-liquid separator and a top spray rinsing unit to ensure complete NMP absorption. Due to the high temperature of incoming gas, energy exchange causes partial water evaporation. The system uses a circulation pump to recycle tower liquid through the adsorption unit, optimizing heat exchange and minimizing water waste while improving the NMP concentration in the recovered liquid. Treated exhaust gas can be discharged directly without further treatment, effectively achieving near-zero emissions.

 

VII. Control System

1. Electrical Panel Components:

No.	Component	Model	Qty	Manufacturer
1	Air Switch	4P/60A	1	Chint
2	Single-Pole Switch	1P/10A	2	Chint
3	Frequency Inverter	1.5KW	1	V&T
4	AC Contactor	1210, 2510	5	Chint
5	Thermal Overload Relay	4A / 13A	4	Chint
6	Indicator Lights	Red, Green	2	Chint
7	Selector Switch	NP2	2	Chint
8	Fuse	6A	1 set	Chint
9	Time Relay	40n	1	Chint
10	Temperature Controller	18/H	2	Chint
11	Alarm Light	Ad16-22sm	1	Chint
12	Control Cabinet	500×400×200 / 400×400×150	1 each	Chint

 

2. Control System Description:

No.	Item	Specification / Remarks
1	Main Control Unit	Independent outdoor protection cabinet; separate strong/weak current layout; remote start/stop from coater; button interface.
2	Operation Modes	Manual, automatic, emergency stop, and remote start/stop.
3	Alarms	Equipment fault alarm via sound-light at coater head and buzzer alarm in outdoor cabinet.
4	Safety Features	Mechanical and electrical interlocks, self-locking, sensor protection, temperature anomaly alarms, and power-off protection.