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Product details
Preheating and concentration (optional but common):
The mother liquor before entering the dryer usually undergoes preliminary evaporation and concentration steps (such as multi effect evaporation and MVR evaporation) to reduce the amount of water that needs to be treated and increase the solid content (such as from 5-10% to 30-70%).
At the inlet of the dryer, the material may be further preheated to reduce viscosity and improve subsequent drying efficiency.
Water/solvent evaporation (core stage):
Energy input: The drying process requires external energy input. This is usually done through:
Heat conduction: The heated wall surface (such as jacket, hollow shaft, hollow blade) directly contacts the material and conducts heat to the material (such as blade dryer, disc dryer, film dryer).
Convection: High temperature gas (such as hot air, superheated steam, flue gas) directly contacts with materials and carries away evaporated water (such as spray dryer, fluidized bed dryer, rotary flash dryer).
Radiation: Infrared or other radiation methods (relatively less used for mother liquor drying).
Phase change: The input heat mainly acts to cause the water (or specific solvent) in the mother liquor to undergo a phase change, transforming from liquid to gas (water vapor or solvent vapor).
Mass transfer and separation:
After absorbing heat, the moisture/solvent molecules inside the material overcome intermolecular forces and diffuse to the surface of the material.
On the surface of the material, gaseous molecules diffuse into the surrounding gas environment (or are evacuated by vacuum).
The drying medium (hot gas or vacuum system) takes away the water vapor/solvent vapor generated by evaporation in a timely manner, maintaining a low vapor pressure difference on the surface of the material, which is the key driving force for continuous drying.
Material transportation and mixing:
The interior of the dryer is usually designed with stirring, conveying or atomization devices (such as rotating blades, spirals, high-speed atomization disks, fluidized bed structures):
Objective 1: To evenly disperse the material and expose it to a heating surface or hot air flow, increasing the heat and mass transfer area and efficiency.
Objective 2: To prevent wall sticking and clumping, and ensure that the material is constantly flipped and the surface is updated during the drying process.
Objective 3: Transport the gradually drying material from the feed end to the discharge end.
Exhaust gas treatment (crucial):
The water vapor and/or volatile organic compounds (VOCs), fine dust, and even a small amount of solvent odor that may be carried during the drying process will be discharged with the exhaust gas.
An efficient exhaust treatment system must be equipped, typically including:
Dust removal: cyclone separator, bag filter, wet scrubber (such as Venturi scrubber), used to remove solid particles.
Condensation: The condenser recovers valuable solvents or reduces gas humidity.
Deodorization/incineration: chemical washing, activated carbon adsorption, thermal oxidation (RTO), catalytic oxidation (RCO), etc., used to treat VOCs and odors, meeting environmental emission requirements.
Cooling standard emission: The exhaust gas needs to be cooled to a safe temperature and ensure that the pollutant concentration is below the emission standard before being discharged.
Dry material discharge:
Dry solids (powders, particles, or blocks) that achieve the target moisture content are discharged from the discharge port of the dryer.
The discharge method may be continuous (continuous dryer) or intermittent (batch dryer).
The dried solid is usually collected in a silo or directly packaged for subsequent processing (such as incineration, landfill, or resource utilization).
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Yanjialong Machinery Technology (Jiangsu) Co., Ltd.
Audited supplier
10 year
Main Product:
MVR evaporator,
Low temperature evaporator,
Sludge dryer,
wastewater evaporator,
Power plant wastewater treatment ,
spray dryer