Product description
The product can indirectly heat or cool paste, granular, powder, and slurry materials, and can complete unit operations such as drying, cooling, heating, sterilization, reaction, and low-temperature combustion. The special wedge-type stirring heat transfer paddle in the device has high heat transfer efficiency and self-cleaning function of the heat transfer surface.

Working principle
Hollow shafts are densely arranged with wedge-shaped hollow blades, and the heat medium flows through the hollow shaft through the hollow shaft. There is a large area of heat transfer within the effective volume of the unit. The temperature of the heat medium ranges from -40°C to 320°C. It can be water vapor or liquid type: such as hot water, heat transfer oil, etc. Indirect conductive heating, without carrying air to take away heat, heat is used to heat the material. The heat loss is only through the body heat insulation layer to the environment. The wedge blade heat transfer surface has a self-cleaning function. The relative motion of the material particles and the wedge-shaped surface creates a scrubbing action, which allows the material on the wedge surface to be washed away so that a clean heat transfer surface is maintained during operation. The shell of the paddle dryer is Ω type, and two to four hollow stirring shafts are generally arranged in the shell. The housing has a sealed end cap and a top cover to prevent material dust from leaking out and fully functioning.
The heat transfer medium passes through the rotary joint and flows through the housing jacket and the hollow agitation shaft. The hollow agitation shaft has different internal structures according to the type of the heat medium, so as to ensure a better heat transfer effect.

Performance characteristics
◎ Blade dryer energy consumption is low: Due to indirect heating, there is no large amount of air to carry away heat, and the outer wall of the dryer is provided with insulation layer. For slurry materials, only 1 kg of water vapor is required to evaporate 1 kg of water.
◎ Blade dryer system cost is low: There is a huge heat transfer surface in the unit effective volume, which shortens the processing time and reduces the size of the equipment. It has greatly reduced the construction area and the construction space.
◎ Wide range of processing materials: With different heat media, heat-sensitive materials can be processed and materials that require high temperature treatment can be processed. Commonly used media are: water vapor, thermal oil, hot water, cooling water and so on.
Both continuous and intermittent operation can be applied in many fields.
◎ Low environmental pollution: Do not use carrying air, dust material is very little entrainment. The solvent evaporation volume is very small and it is easy to handle. For contaminated materials or conditions that require solvent recovery,
Closed loop.
◎ Operating cost is low: the structure. The amount of wear is small and maintenance costs are low. The
◎Operation stability: Due to the special compression-expansion stirring action of the wedge-shaped paddle, the particles of the material are fully in contact with the heat transfer surface. In the axial range, the gradient of temperature, humidity and mixing degree of the material is very small, thereby ensuring the process Stability.

Adapt to the material
The paddle dryer has been successfully used in food, chemical, petrochemical, dye, industrial sludge and other fields. The heat transfer, cooling and stirring characteristics of the equipment allow it to perform the following unit operations: combustion (low temperature), cooling, drying (solvent recovery), heating (melting), reaction and sterilization. The stirring blade is a heat transfer surface at the same time, so that the heat transfer area in the unit effective volume is increased, and the processing time is shortened. The wedge-shaped blade heat transfer surface also has a self-cleaning function. Compression - expansion stirring function makes the material mix evenly. The material moves in the axial direction as a “plug flow”. In the axial interval, the gradient of temperature, humidity and mixing degree of the material is very small. The heat medium blade dryer can be used for the low-temperature combustion work. Such as: calcium sulfate dihydrate (Ca2SO4 · 2H2O) combustion into calcium sulfate hemihydrate (Ca2SO4 · 1/22H2O). Sodium bicarbonate (NaHCO3) was converted into soda (Na2HCO3) by calcination. The cooling medium, such as water, cooling brine, etc., can be used for cooling. For example, paddle coolers used in the soda industry replace old-fashioned air-cooled coolers, saving energy and exhaust gas treatment equipment and reducing operating costs. The main function of the drying equipment is that it does not use hot air, so that solvent recovery, energy consumption, and environmental control are in an ideal state of easy handling. Particularly suitable for the recovery of solvents, flammable and easy oxidation of heat-sensitive materials. Has been widely used in fine chemicals, petrochemicals, dyes industry. Within the axial section, the uniformity of temperature, humidity, and mixing allows the device to be used for heating or melting, or for some solid material reaction. It has been successfully used in the compound fertilizer and modified starch industries. The paddle dryer can be used to sterilize food and flour. The large heating area in the unit's effective volume quickly heats the material to the sterilization temperature, avoiding long-term heating and changing the material quality.

Installation structure

Technical specifications

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