Material characteristics:

Sodium sulfate, inorganic compound, white, odorless, bitter crystal or powder, hygroscopic. Appearance is colorless, transparent, large crystal or granular small crystal. Mainly used in water glass, glass, enamel, pulp, refrigeration mixture, detergent, desiccant, dye diluent, analytical chemical reagents, pharmaceuticals, etc.

Special drying process:

Sodium sulfate drying has the following characteristics and requirements: when the water content is large, the material is sticky and easy to scar; the material is loose, but the fluidity is not good; it requires low energy consumption, uniform heating of the material, good operating environment, and one-time compliance Index requirements.

According to the material analysis and many years of engineering experience, the engineering and technical personnel of Hebei Yanming Chemical Equipment Co., Ltd. successfully used the energy-saving and environment-friendly disc continuous dryer as the sodium sulfate drying system, and has been widely used in sodium sulfate drying.

The traditional disc-type continuous dryer is easy to scar in the process of drying sodium sulfate, causing the rake leaf to be easily tilted, the material scarred on the drying disc is not easy to scratch, the rake leaf of the rake rod is easy to be damaged, and the thread of the rake rod thread connector is easy to be damaged. Moreover, the circulation of dry materials in this system is large, and the traditional disc continuous dryer is easy to cause wet materials to fall directly from the top to the bottom during the drying process, resulting in the moisture content of the dried product not up to the standard. According to the above characteristics, our company has reformed the disc continuous dryer, and adopted our patented technology to design a disc continuous dryer specially suitable for sodium sulfate drying.

The wet sodium sulfate material transported from the previous process is continuously and quantitatively added into the energy-saving and environment-friendly disc continuous dryer by the quantitative feeder for drying operation. The material completes the heat and mass transfer process in the flow process to achieve the purpose of drying. After the dry material is cooled in the dryer to reach the packaging temperature (generally about 50 ℃), it is discharged from the discharge port at the bottom into the packaging equipment for packaging, and the tail gas escaping from the material is discharged from the induced draft fan after dust removal by the dust collector.

Process characteristics:

Continuous operation, high thermal efficiency. Since the disc continuous dryer is dried by conduction heat transfer, air (or a very small amount of air) is not passed into the dryer during the drying process, and its tail gas carrying capacity is very small, so its thermal efficiency can reach more than 85%;

② Less material loss and good operating environment. In the drying of sodium sulfate in the disc continuous dryer, because the materials go in and out, the distribution of the materials is wet and dry, and the flow rate of the drying tail gas is extremely low (about 0.1 m/s), the material dust is difficult to float to the top of the equipment and is rarely carried away by the tail gas, which not only does not lose the materials, but also does not pollute the environment, thus meeting the requirements of environmental protection;

The adjustable equipment, material drying uniform adjustable. The effect of material drying can be conveniently adjusted by adjusting the speed of the equipment, adjusting the thickness of the material layer, the flow rate of the heat source, the temperature of the heat source, the number of rake arms, the form, size and angle of rake leaves, the amount of material added and the number of drying trays in the dryer;

④ Stable operation, long service life and simple operation;

⑤ The material flow direction is single, there is no backmixing phenomenon, the drying is uniform, the quality is stable, and there is no need to mix again;

⑥ Each layer of drying tray can be separately introduced into the hot medium or cold medium to heat or cool the material, and the upper part of the drying and lower part of the cooling can also be realized in one device, and the material temperature control is accurate and easy;

⑦ Easy installation, small footprint. The dryer is shipped as a whole and transported as a whole. It only needs to be hoisted in place, and the installation and positioning are very easy. Due to the layer-by-layer arrangement and vertical installation of the drying tray, even the drying area is large and the floor area is small;

⑧ The patented technology (utility model patent, patent number: ZL2016212122004) is used to separate the drying zone and the cooling zone in one device, to isolate the diffusion of moisture from the drying zone to the cooling zone, and to prevent the moisture from condensing and increasing the humidity of the dried material. At the same time, the opening is set so that the material can pass through to ensure normal operation;

⑨ In view of the easy scarring of materials in the drying process of sodium sulfate, our company adopts special rake rods and rake leaves to effectively avoid scarring of materials on the drying tray.

⑩ For disc-type continuous dryers with large material circulation, our company carries out special design for drying to prevent wet materials from falling directly to the chassis and causing unqualified product moisture.

In view of the easy damage of the thread connection head of the rake rod of the disc continuous dryer with large material circulation, our company adopts a detachable device to install the rake rod, which is convenient for maintenance.

The use of patented technology (utility model patent, patent number: ZL2016212122004) avoids the slippage of the transmission device in the dryer, so that the dryer is not damaged and runs normally.

The upper part of the dryer is provided with a cloth distribution device to ensure that the materials can be evenly distributed on the drying tray and to prevent the materials from falling directly into the drying tray from the feeder to damage the rake leaves of the rake rod.

sodium sulfate drying system process flow diagram: