China Double Cone Vacuum Dryer Products & Service

The standard designed volumetric filling coefficient for an SZG Double Cone Vacuum Dryer ranges strictly between 30% and 50% of the total internal vessel volume. Operating above 50% critically obstructs the internal vapor expansion space, blinds the vacuum exhaust filter tube, and inhibits the gravitational turnover of bulk solid beds, which substantially extends drying time. Conversely, loading under 20% diminishes thermal conduction efficiency between the heated shell and the powder bed.

To eliminate fine powder migration into vacuum condenser coils and vacuum pump seals, our dryers incorporate a stationary vacuum trunnion lance fitted with multi-layered sintered wire mesh or porous titanium filter cartridges (retaining particles down to 1-5 μm). Furthermore, an automated high-pressure reverse nitrogen gas pulsation pulse system periodically purges cake build-up back into the tumbling chamber while drying proceeds.

We employ high-precision balanced double mechanical face seals engineered with silicon carbide against tungsten carbide or diamond-coated faces. These seals incorporate a pressurized nitrogen or compatible liquid barrier system (API Plan 53A/54), guaranteeing absolute isolation between the deep negative chamber vacuum (-0.098 MPa) and ambient atmospheric conditions, completely eliminating product oxidation and vacuum loss.

Yes. When recovering flammable organic solvents (such as acetone, methanol, toluene, or hexane), the entire machine is certified to ATEX Directives. This includes flameproof drive gearmotors (Ex d IIB T4 / Ex tD A20), copper earthing slip rings to dissipate static charges across trunnion shafts, non-sparking coupling guards, and oxygen-monitoring nitrogen purge interlocks that inhibit rotation until internal O2 concentrations drop safely below 2%.

The dimpled or concentric outer jacket can be customized for low-pressure saturated steam (≤ 0.4 MPa), pressurized hot water (up to 95°C), or synthetic thermal transfer oil (up to 200°C). For processes requiring rapid cycle termination, an integrated dual-circuit utility skid can immediately switch the jacket from heating to chilled water cooling, accelerating discharge readiness without exposing operators to thermal hazards.

While an Agitated Nutsche Filter Dryer (ANFD) combines solid-liquid filtration, washing, and drying within one vessel, its internal high-torque agitator blades generate shear forces that can shear sensitive crystal needles or spheroids. The Double Cone Dryer offers completely non-destructive, gravity-induced rolling agitation, significantly lower initial capital expenditure, lower maintenance costs, and exceptional suitability for free-flowing crystal drying post-centrifugation.

Our turnkey solvent recovery skids incorporate a two-stage heat exchanger train. The primary tubular condenser utilizes cooling tower water (25-30°C) to capture bulk solvent condensation, followed by a secondary sub-cooling condenser fed with chilled brine or glycol (-10°C to 5°C) to strip trace volatile vapors before reaching the liquid ring or dry claw vacuum pump, achieving overall solvent condensation yields exceeding 98.5%.

Internal shell contact surfaces undergo progressive mechanical honing followed by electrochemical polishing to achieve an ultra-smooth finish of Ra ≤ 0.2 μm. For highly sticky compounds or chloride hygroscopic salts, we apply specialized anti-stick polymer coatings, isostatic PTFE linings, or electro-deposited fluoropolymer layers that completely prevent product bridging and crust formation.