Brief Overview of the Characteristics of Small Sludge Dryers

Sludge is a solid sediment produced by the water and wastewater treatment process. Its main characteristics include high water content, high organic matter content, prone to decomposition and odor, fine particles, low density, and a gel-like liquid state. Sludge is mainly categorized by source into: domestic wastewater sludge, industrial wastewater sludge, and water supply sludge. The disposal and treatment of various sludge types have become a chronic problem制约ing urban development and urban sanitation.

The Small Sludge Dryer is an indirect heating, low-speed mixing dryer featuring two or four hollow rotating shafts inside. These shafts are densely arranged with sector-shaped hollow blades, showcasing a uniquely clever structural design. The shafts rotate relatively, utilizing the principle of the same angular velocity but different linear velocity, and ingeniously achieving the self-cleaning of sludge on the shafts. This design maximally prevents the shaft locking phenomenon during the sludge drying process.

Next up, we will introduce the features of the small sludge dryer.

1. The drying process relies on indirect heating through heat conduction, as the required heat for equipment drying is obtained. Therefore, no or only a small amount of gas is needed to remove moisture. This reduces the heat loss carried away by the air flow, improves heat utilization efficiency, and is a type of energy-saving drying equipment.

2. Agitation and mixing cause the material to be vigorously flipped, resulting in a high heat transfer coefficient. Therefore, the occupied area and space are minimal, saving on factory construction costs. The drying process requires little gas, with low flow rates, and a small amount of dust is carried away by the gas, making it easy to recover the dust after drying. The recovery equipment is compact, allowing for savings in equipment investment. For drying processes that require solvent recovery, the solvent concentration can be significantly increased. Due to the unique paddle structure, the material alternates between compression and relaxation during the drying process, enhancing the drying efficiency. The filling rate of the material in the drying chamber is very high, reaching 80%-90%, and the material's residence time can be adjusted from a few minutes to several hours by regulating parameters such as feeding speed, impeller speed, and material filling rate.

3. Suitable for drying sludge from municipal, dyeing, papermaking, electroplating, and other fields, this solution boasts high thermal efficiency, broad application scope, and low operation costs, while also enabling continuous production.