Polyacrylamide (PAM)

1.Material Overview

Polyacrylamide, abbreviated as PAM, is a high molecular weight polymer typically composed of acrylamide monomers linked together at both ends. It is a hard, glassy solid at room temperature. Depending on the manufacturing method, the product can be a white powder, translucent beads, or flakes. Its density is 1.302 g/cm³ (23 ℃ ), glass transition temperature is 153 ℃ , and softening temperature is 210 ℃.

Polyacrylamide possesses multiple functions, including flocculation, thickening, drag reduction, adhesion, colloid stabilization, film formation, and scale inhibition. It is widely used in industries such as papermaking, mining, coal washing, metallurgy, and oil extraction, and is an important chemical for water treatment .

2.Process Introduction

The drying system uses two-stage drying process for drying of PAM with paddle dryer as 1st-stage and fluidized bed dryer as 2nd-stage.

PAM (polyacrylonitrile) particles from upstream first is fed into the paddle dryer for pre-drying. As the paddles rotate, the particles are agitated and undergo thorough heat exchange with the hot air. The dried particle then is fed into vibrating fluidized bed dryer, where hot air exchanges heat and mass with the PAM particles, increasing their temperature and removing moisture. The dried material is then discharged through the fluidized bed discharge valve to proceed to downstream processes.

3. Technical Advantages

1) By utilizing vibration-assisted fluidization combined with low-velocity conveying, the material is protected from strong airflow impacts, resulting in an extremely low crystal breakage rate. Coupled with uniform air distribution and segmented temperature control, the uniformity of drying is high.

2) Fully enclosed continuous structure, with low heat loss, high thermal efficiency, and no dust spillage.

3) The equipment has a simple and reliable structure. The material residence time can be precisely adjusted by the vibration frequency and the dryer inclination angle. It is easy to maintain and has strong adaptability to working conditions.

4. Technical Benefit

1） Higher product quality and profit

Thanks to the use of low-impact vibration fluidization, the crystals remain intact with reduced dust and stable moisture content. Consequently, both the pass rate of finished products and the utilization rate of raw materials have seen a substantial increase, directly boosting the product's market value.

2)Lower operating costs

Due to the reduction in fan power consumption caused by fluidization at low wind speeds, the utilization rate of hot air is higher, resulting in significant energy savings. Additionally, the equipment has no complex rotating parts and fewer wearing parts, leading to lower labor and maintenance costs.

3)More efficient production

Due to its fully enclosed dust-free design, no additional environmental protection investment is required, and the production environment meets clean standards; continuous operation and adjustable parameters allow for easy integration with production lines, making it suitable for large-scale, high-efficiency production.