Sodium sulfate is an inorganic compound that is usually a white, odorless, bitter crystalline solid or powder that is hygroscopic. It can be a large, colorless and transparent crystal, or it can be a small granular crystal. It is widely used in water glass, glass, ceramic glaze, wood pulp, refrigerants, detergents, desiccants, dye thinners, analytical chemical reagents and pharmaceuticals.

In the industrial production of sodium sulfate, drying is a key step. The drying of this special material has unique characteristics and requirements: when the moisture content is high, the material will become sticky and easily agglomerate on the surface of the equipment (forming a hard shell); in addition, although the material itself is relatively loose in structure, it has poor flowability. An ideal drying process must meet the following specific criteria: low energy consumption, uniform heating, environmentally friendly, and the ability to reduce the moisture content of the product to the required specifications in a single drying process.

In order to meet these challenges, our company's engineering team relied on in-depth material analysis and years of practical experience in drying engineering to successfully develop an efficient, energy-saving and environmentally friendly continuous disc dryer, and used it as the core system for sodium sulfate drying. This solution has been widely used and verified in the industry.

When traditional disc dryers process sodium sulfate, they often encounter the problem of material agglomeration. Clumbing can cause the scraper to deform or tilt; material adhered to the drying plate is difficult to scrape off, damaging the scraper arm, scraper, and even threaded connections. In addition, when the material handling capacity is high, wet materials can easily fall directly from the upper layer to the bottom of the equipment, resulting in the moisture content of the final product not meeting the requirements.

In response to these problems, our company has carried out a series of targeted improvements and innovations on the standard continuous disc dryer. By integrating multiple patented technologies, we have designed an enhanced continuous disc dryer that is specifically optimized for efficient drying of sodium sulfate.

Process flow overview: Wet sodium sulfate material from the previous production stage is continuously and stably fed to the top of the dryer through a dosing machine. When the material flows downward through each layer of drying discs, it conducts indirect heat and mass transfer with the heat medium circulating in the discs; during this process, water is gradually removed, thereby achieving the required drying effect. The dried material is finally cooled in the lower part of the equipment (specifically in the cooling zone) to the packaging temperature (usually about 50 ° C), and then discharged from the bottom outlet for packaging. The trace amount of waste gas generated during the drying process will be subject to dust removal and purification before being exhausted through the induced draft fan.

The main process advantages of this special sodium sulfate disk drying system:

1. Efficient and energy-saving; can operate continuously: The dryer adopts a conductive heat transfer mechanism and requires almost no large air volume; therefore, the exhaust emissions are extremely low, and the thermal efficiency can exceed 85%, far exceeding that of convective drying equipment.

2. Environmentally friendly and low loss; excellent operating environment: materials flow from top to bottom, the upper layer is moist and the lower layer is dry. Combined with a very low exhaust gas flow rate (about 0.1 m/s), dust diffusion is effectively suppressed. Materials are almost completely free from entrainment by exhaust gases, minimizing product losses while ensuring a clean and environmentally friendly workplace.

3. Flexible adjustment; uniform drying: The drying process can be accurately controlled through a variety of parameters, including spindle speed, material layer thickness, heating medium temperature and flow, rake blade structure and number, and number of effective drying plates, thereby ensuring stable and uniform product quality.

4. Reliable operation; long service life: The equipment has a solid structure, smooth operation, easy maintenance, low failure rate and long service life.

5. One-way flow; stable quality: The material moves along the "plug flow" trajectory on the drying plate, eliminating backmixing. This ensures excellent drying uniformity and eliminates the need for subsequent mixing processes.

6. Integrated drying and cooling; precise temperature control: Each drying plate can be independently supplied with heating medium (steam/heat energy).