Optimizing an NPK blending fertilizer production line requires focusing on three core objectives: reducing costs and increasing efficiency, improving product quality, and ensuring stable operation. This involves targeted adjustments throughout the entire process, from raw material handling, mixing and granulation, drying and cooling, to screening and packaging.  Specific optimization directions are as follows:

1. Raw Material Pre-treatment Optimization

Replace manual weighing with a precise batching system, and use an online moisture detector to real-time control the moisture content of raw materials, preventing granulation difficulties caused by uneven moisture; pre-crush and screen agglomerated nitrogen, phosphorus, and potassium raw materials to ensure uniform particle size and improve mixing uniformity.

2. Mixing and Granulation Optimization

Select high-efficiency fertilizer granulator machines, such as fertilizer roller press granulators, to shorten mixing time; precisely control the proportion of binder added according to the characteristics of the raw materials to reduce the return rate; use variable frequency speed control technology to adjust equipment speed to adapt to the granulation needs of different compound fertilizer formulations.

3. Drying and Cooling System Optimization

Adopt a closed-loop drying and cooling process to recover waste heat from exhaust gas for preheating the drying medium, reducing energy consumption; control the drying temperature in stages to prevent nitrogen loss due to high temperatures; select a countercurrent cooler to improve cooling efficiency while reducing material breakage.

4. Screening, Packaging, and Automation Optimization

Equip with multi-layer grading screens to accurately separate finished products, returned materials, and large particles, improving the finished product qualification rate; introduce a fully automatic packaging and palletizing line to replace manual operation, reducing packaging errors and labor intensity; build a production line central control system to monitor parameters of each link in real time, enabling abnormal warning and intelligent control.

5. Process Linkage Optimization

Rationally design the material transportation paths between each process to reduce material retention and blockage; set up buffer silos at key nodes to balance the production capacity of preceding and succeeding processes, preventing the entire line from shutting down due to a malfunction in one link.