What drying technologies are commonly used in new sludge dryers?

Sludge disposal should not only consider the pollution of the environment, but also consider the utilization of sludge resources, which put forward higher requirements for sludge dryer. In recent years, many new sludge dryers with new technology and new technology have appeared in the market. In order to make it easy for everyone to understand, the editor summarizes it roughly. If you need it, please look down.

What drying technologies are commonly used in new sludge dryers?

At present, sludge dryer manufacturers are blooming all over the country, and many new process products have emerged. According to the technology, they can be divided into fluidized bed drying, disc drying, centrifugal dehydration drying, solar drying, pulp drying, three cylinder multi return network drying and so on.

1. Disc drying technology

Firstly, the oil furnace is heated by external heat energy, and then flows into a tubular hollow shaft through high-temperature oil body. At the same time, the hot oil in the shaft is distributed to the rotating empty plate connected with the hollow shaft. By indirect heating, the pan is filled with steam and the moisture of sludge is evaporated. At present, the market can be divided into horizontal disc drying and vertical multi disc drying. The operation cost of the process equipment is higher. Due to the indirect heating technology, the utilization rate of heat energy is not as high as that of direct heating.

2. Centrifugal drying technology

Centrifugal drying technology is an integrated process of dehydration and drying, which is divided into mechanical dehydration and high temperature centrifugal drying. The moisture content of the sludge after centrifugal dewatering is reduced to about 80%, and the sludge is in the shape of sludge cake. The sludge is discharged from the discharge port and then introduced into the centrifugal dryer to be dried with high temperature hot gas until the solid content reaches about 80%. The integrated system design is adopted in the process. The facilities provided by the same manufacturer bring convenience to equipment maintenance.

3. Fluidized bed drying technology

The sludge with this technology can not be pretreated. After being sent to the fluidized bed dryer, the fluidized gas is evenly blown into the bottom of the dryer to form a fluidized layer. With the moisture content of the sludge gradually reduced, the density of the fluidized layer decreased, and gradually increased to the upper part, and then the gas was extracted from the upper part.

4. Drum drying technology

The drum dryer can use natural gas, biogas and other combustible gases, with air as the heat transfer medium. Wet sludge and some dried sludge particles are mixed in the mixer. The hot gas will bring the mixture into the drum dryer. Through direct heating or indirect heating, the gas flow will carry the sludge particles forward until the drying is completed and discharged.

5. A new type of sludge dryer with three cylinders and multi return network

The three drum multi return network sludge drying equipment is upgraded and reformed on the basis of the original "single drum drying equipment". The "three-stage drying core" technology is adopted. According to the water content requirements of materials, the parameters of air volume, wind speed, wind direction and heat can be freely configured, which greatly improves the utilization rate of heat energy and drying efficiency. The whole drying process is divided into three stages: forward flow drying zone, counter current drying zone and mixed reciprocating drying zone. The specific drying steps are as follows: after the sludge is sent into the drum of the sludge dryer, it is first broken and broken, and then it moves forward at a stable speed under the entrainment of hot air. It is transferred from the inner cylinder to the outer cylinder. After drying in the 1st, 2nd and 3rd drying chambers, the sludge particles will be dried and discharged from the discharge port. This technology can be combined with new technologies such as "boiler tail gas utilization", "rotary harrow three-cylinder multiple-loop", which greatly reduces the energy consumption of sludge dryer, energy saving and emission reduction, and helps enterprises reduce the equipment operation cost.