When purchasing a pressure spray dryer, factors such as material characteristics, production demand, equipment performance and subsequent maintenance should be comprehensively considered. Here is a detailed purchasing guide:
1. Clarify material characteristics
Physical properties: viscosity, density, solid content, flowability, etc. High viscosity materials require the use of high-pressure pumps (such as plunger pumps).
Heat sensitivity: temperature sensitive materials (such as enzymes and probiotics) need to control the inlet/outlet temperature (such as low-temperature spray drying or adding cooling systems).
Corrosive: Materials with strong acidity and alkalinity should be made of corrosion-resistant materials (such as 316L stainless steel and titanium).
Target product form: Powder particle size (such as nanoscale requiring centrifugal atomization), moisture content (such as ≤ 5% requiring secondary drying).
2. Core equipment parameters
Atomization method:
Pressure atomization: suitable for medium viscosity and high production (such as chemical and ceramic powders), with a particle size range of 80-150 μ m.
Centrifugal atomization: suitable for low viscosity, fine powder requirements (such as milk powder, dyes), particle size 30-80 μ m.
Airflow atomization: used for high viscosity or laboratory small batches, but with high energy consumption.
Evaporation capacity: According to the water evaporation rate (such as 100kg/h), match the equipment model and reserve 10-20% margin.
Temperature control: The hot air temperature range should cover 150-300 ℃ (conventional) or 40-80 ℃ (low-temperature drying), with PID precise temperature control of ± 2 ℃.
Heat source selection: electric heating (clean), gas (economical), steam (stable), energy cost needs to be considered.
3. Key system configuration
Feeding system: screw pump (high viscosity), magnetic pump (corrosive liquid), equipped with filter anti clogging.
Hot air system: high-efficiency cyclone separator (recovery rate ≥ 95%), bag filter (exhaust dust ≤ 30mg/m ³).
Control system: PLC+touch screen, equipped with parameter memory and fault alarm (such as temperature exceeding limit and pressure abnormality).
CIP cleaning: The pharmaceutical and food industry requires automatic cleaning function to reduce cross contamination.
4. Energy efficiency and environmental protection
Thermal efficiency: The thermal utilization rate of high-quality equipment is ≥ 60% (designed for waste heat recovery).
Emission standard: compliant with GB 31571-2015 (air pollutant emissions), optional wet dust removal or activated carbon adsorption.
5. Supplier evaluation
6. Budget and Verification