Special disc (blade) dryer for sludge dryingIntroduction:

A special disc (blade) dryer for sludge drying is a type of equipment that is equipped with stirring blades inside. The blades are divided into three types: disc type, spiral type, and wedge type, so that wet materials can fully contact the hot surface of the heating carrier under the stirring of the blades, thereby achieving the purpose of drying. The structural form is generally horizontal, single axis, double axis, or four axis. Paddle dryers are divided into hot air type and conductive type. The hot air form refers to the direct contact and drying of the material to be dried through a heat carrier (such as hot air), while the conductive form refers to the heat carrier not directly contacting the material to be dried, but rather the conductive contact between the hot surface and the material to be dried. The sludge covers the blade and generates a washing effect with the relative movement of the blade surface.

Hollow blades are densely arranged on the hollow shaft, and the heat medium flows through the blades through the hollow shaft. The heat transfer area within the unit effective volume is very large (generally, the area of a single dual axis blade is ≤ 200m2); The area of a single four axis blade is ≤ 400m2, and the temperature of the heat medium ranges from 60~320 ℃. It can be water vapor or liquid, such as hot water, heat transfer oil, etc. Indirect conduction heating, where the heat is used to heat the material, and the heat loss is only due to the heat dissipation to the environment through the insulation layer and dehumidification of the device body.

Performance characteristics:
(1) . The equipment has a compact structure and occupies a small area. The heat required for drying is mainly provided by the hollow blade wall arranged on the hollow shaft, while the heat transfer from the jacket wall only accounts for a small part. So the heat transfer surface of the unit volume equipment is large, which can save the equipment footprint and reduce infrastructure investment.

(2) . High heat utilization efficiency. The sludge dryer adopts conduction heating method for heating, and all heat transfer surfaces are covered by materials, reducing heat loss; The heat utilization rate can reach over 85%.

(3) . The blade has a certain washing ability, which can improve the heat transfer effect of the blade. The dispersing force generated by the combined motion of the inclined surface of the rotating blade and the particle or powder layer enables the sludge attached to the heated inclined surface to have a cleaning function. In addition, due to the reverse rotation of the two shaft blades, the alternating segmented compression and expansion stirring functions ensure uniform heat transfer and improve heat transfer efficiency.

(4) It can achieve continuous and fully enclosed operations, reducing manual and dust emissions.

(5) In terms of exhaust gas treatment, the system generally adopts two forms: normal pressure or negative pressure. According to different situations, the exhaust air volume should be minimized as much as possible to reduce the cost of exhaust gas treatment. For the odor caused by sludge evaporation, another deodorization system can be used to treat it and meet the emission standards.

(6) Our company can design a high vacuum blade drying process for low-temperature drying of hazardous chemical sludge containing toxic and solvent substances. This not only allows for direct solvent recovery, but also greatly reduces exhaust emissions, greatly improving safety and environmental performance.

Performance parameters of paddle sludge dryer (reference):

configuration	biax										four-axis
model	Type 5	Type 15	Type 20	Type 40	Type 60	Type 80	Type 100	120 type	150 type	200 type	300 type	400 type	500 type
heat transfer area	5	15	20	40	60	80	100	120	150	200	300	400	500
Host power	4	15	18.5	30	37	45	55	75	90	110	180	220	264
notes	Using different materials and configurations according to the characteristics and requirements of different sludge

The specialized disc (blade) dryer for sludge drying consists of subsystems such as a sealed feed system, a vacuum disc blade dryer, a sealed discharge system, and a tail gas treatment system. The system achieves safe operation by controlling combustible components, temperature control, pressure control, and oxygen control. It has high applicability for sludge drying and recovery containing oil and organic solvents, and is currently one of the safest systems in sludge drying processes.

The equipment is based on atmospheric pressure drying equipment, with improved design and enhanced system pressure resistance, achieving a high negative pressure environment for the system and effectively preventing the accumulation of explosive gases inside the drying chamber.