I. System Function

This series of NMP recovery units utilizes the property that NMP is fully miscible with water to recover and treat exhaust gas emitted from coating machines. The system operates fully automatically to ensure operational stability and safety. It adopts a three-stage segmented spray absorption design, with final emissions significantly lower than national standards.

The system is composed of: ventilation ducts, recovery towers, pump units, blower, NMP liquid storage tank, and control system. The recovery unit offers high efficiency, low operational costs, compact footprint, appealing appearance, and superior performance. It is suitable for various environments and installation layouts, with simple operation, making it ideal for the coating processes of multiple lithium battery production lines.

II. System Configuration

1. Air Handling Capacity: 5000 m³/h
Model: TMAX-GT-5000FL
Environmental Standard: GB 30484-2013 Emission Standard of Pollutants for the Battery Industry (non-methane total hydrocarbon concentration limit)

2. Main Unit Color: SUS gray

3. Functional Module Overview:

4. Delivery List:

5. Main Components – 4000 Air Volume NMP Recovery System: (Applicable here as shared model)

III. Design Basis and Reference Standards

1. Complies with national, industry, and local regulations as well as client requirements.

2. Uses energy-efficient and easy-to-implement treatment methods to minimize power usage, capital investment, footprint, and operational complexity.

3. All mechanical and electrical components are selected from well-known, reputable brands to ensure reliability.

4. The system does not produce secondary pollution during construction or operation.

IV. Design Parameters

V. Equipment Process Flow

1. Process Flow Diagram: (Image for reference only)

2.Installation Diagram: (Image for reference only)

VI. Working Principle of NMP Recovery Tower

1. The system recovers NMP by absorbing it into pure water. Waste gas enters from the bottom of the tower and passes through an adsorption unit where NMP dissolves into water and vapor. After treatment, the gas passes through a gas-liquid separator and a top rinsing stage to ensure complete NMP capture.

2. Because of the high temperature of the inlet gas, energy exchange during recovery causes some water evaporation. A circulation pump redirects liquid from within the tower back to the adsorption unit for reuse, enabling effective heat recovery, reducing water waste, and improving NMP concentration in the recovered liquid. Treated exhaust gas can be directly vented with near-zero emission.

3. Structure of the Tower:

The tower is composed of three key functional sections:

Spray Heat Exchange Zone: Allows rapid mass and heat exchange between NMP vapor and water. Direct contact eliminates heat transfer wall resistance, ensuring high efficiency.

Mass Transfer Separation Zone: Uses high-efficiency structured packing (specific surface area 140Y). Liquid flows downward while NMP gas rises in countercurrent, ensuring effective capture of vapor droplets.

Demisting Zone:

Lower demister uses baffles and inertia to remove droplets; airflow is zigzagged to force collection.

Upper demister forms spiral airflow that throws droplets to the sides into collection channels.

Demisting efficiency: 90%–99%.

VII. Control System

1. Electrical Panel Components:

2. System Control Description: