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What is the working principle of HCD vacuum low-temperature high concentration concentrator and flas
source：www.sjbyj.com Release time：2026-06-01
1、 HCD Vacuum Low Temperature High Concentration Concentrator (Vacuum Low Temperature Concentrator)
1. Core principles
By utilizing vacuum to lower boiling point, low-temperature heating, forced film-forming evaporation, and condensation recovery, water/solvent can be evaporated at 40-70 ℃ to achieve high concentration, making it particularly suitable for thermosensitive materials such as traditional Chinese medicine, fruit juice, biological fluids, protein solutions, etc.
2. Workflow (5 steps)
(1) Vacuum pumping
The vacuum pump draws the evaporator to a high vacuum of -0.08 to -0.095MPa, reducing the boiling point of water to ≈ 35-55 ℃, achieving "low-temperature boiling".
(2) Preheating and feeding
The raw liquid is heated by a preheater (using waste heat) and enters the evaporation chamber (falling film/scraping film/rising film structure).
(3) Low temperature evaporation (core)
Heating: The jacket/coil is connected to low-temperature steam/hot water (70-90 ℃).
Film formation: The material forms a 0.5-1mm thin film along the heating wall, with extremely fast heat transfer.
Evaporation: Boiling at low temperatures under vacuum, water quickly turns into secondary steam.
(4) Vapor-liquid separation+condensation recovery
The steam first passes through the vapor-liquid separator, and the small droplets carried are thrown back (to prevent material leakage).
Then it enters the condenser and is cooled by the cooling water into water/solvent, which is recovered or discharged.
(5) High concentration liquid discharge
The water continues to evaporate, and the concentration continues to increase. After reaching the set concentration, the concentrated solution is discharged from the bottom.
key features
Low temperature (<70 ℃)+vacuum: The thermosensitive component does not damage, change color, or degrade.
High concentration: can be concentrated to a solid content of 60% to 90%.
Energy saving: Multi effect/MVR can reduce steam consumption by 30% to 70%.
Fully enclosed: odorless, pollution-free, solvent recyclable.
In one sentence: vacuum boiling point reduction, fast evaporation of thin films, low temperature activity preservation, and recyclable condensation.
2、 Flash evaporation drying unit (rotary flash evaporation drying)
1. Core principles
High temperature swirling hot air+mechanical strong crushing+suspension fluidization+instant heat and mass transfer+graded sorting, directly dry paste/filter cake/paste materials into powder within a few seconds.
2. Workflow (6 steps)
(1) Hot air preparation
The hot air stove/heat exchanger heats the air to 150-300 ℃ (150-200 ℃ for thermosensitive materials).
(2) Tangential air intake creates a swirling flow
Hot air enters at high speed from the bottom of the drying chamber in a tangential direction, forming a strong rotating upward airflow (≈ 50-60m/s).
(3) Feed+Strong Crushing
The paste/filter cake is quantitatively fed into the bottom by a spiral feeder; The high-speed stirring blade (500-1500rpm) crushes, shears, and peels large pieces of material into small particles.
(4) Suspension fluidization+instant drying (flash evaporation)
Small particles are lifted and suspended by swirling hot air, with a specific surface area in contact with high-temperature hot air; Water evaporates instantly within 0.5 to 5 seconds, achieving "flash evaporation".
grading and sorting
There is a grading device/grading ring at the top:
Qualified fine powder (20-100 mesh) enters the receiving system as the airflow rises;
Coarse wet particles are intercepted by centrifugal force and fall back to the bottom to be broken and dried again.
Gas solid separation+tail gas treatment
The airflow carries powder into the cyclone separator, collecting over 95% of the finished products;
The tail air is further refined by a bag filter for dust removal, and meets the emission standards.
key features
Wide range of feed forms: directly process filter cake, paste, paste, and slurry without pre drying.
Extremely short heating time (in seconds): suitable for materials that are thermally sensitive, easily oxidized, and prone to discoloration.
One step powder production: integrated drying, crushing, and screening, eliminating the need for post crushing and screening.
Fully enclosed negative pressure: less dust, good environment, can be equipped with inert gas for oxidation prevention.
In one sentence: Hot air swirl, mechanical dispersion, suspension for a few seconds, and instant drying into powder.
1. Core principles
By utilizing vacuum to lower boiling point, low-temperature heating, forced film-forming evaporation, and condensation recovery, water/solvent can be evaporated at 40-70 ℃ to achieve high concentration, making it particularly suitable for thermosensitive materials such as traditional Chinese medicine, fruit juice, biological fluids, protein solutions, etc.
2. Workflow (5 steps)
(1) Vacuum pumping
The vacuum pump draws the evaporator to a high vacuum of -0.08 to -0.095MPa, reducing the boiling point of water to ≈ 35-55 ℃, achieving "low-temperature boiling".
(2) Preheating and feeding
The raw liquid is heated by a preheater (using waste heat) and enters the evaporation chamber (falling film/scraping film/rising film structure).
(3) Low temperature evaporation (core)
Heating: The jacket/coil is connected to low-temperature steam/hot water (70-90 ℃).
Film formation: The material forms a 0.5-1mm thin film along the heating wall, with extremely fast heat transfer.
Evaporation: Boiling at low temperatures under vacuum, water quickly turns into secondary steam.
(4) Vapor-liquid separation+condensation recovery
The steam first passes through the vapor-liquid separator, and the small droplets carried are thrown back (to prevent material leakage).
Then it enters the condenser and is cooled by the cooling water into water/solvent, which is recovered or discharged.
(5) High concentration liquid discharge
The water continues to evaporate, and the concentration continues to increase. After reaching the set concentration, the concentrated solution is discharged from the bottom.
key features
Low temperature (<70 ℃)+vacuum: The thermosensitive component does not damage, change color, or degrade.
High concentration: can be concentrated to a solid content of 60% to 90%.
Energy saving: Multi effect/MVR can reduce steam consumption by 30% to 70%.
Fully enclosed: odorless, pollution-free, solvent recyclable.
In one sentence: vacuum boiling point reduction, fast evaporation of thin films, low temperature activity preservation, and recyclable condensation.
2、 Flash evaporation drying unit (rotary flash evaporation drying)
1. Core principles
High temperature swirling hot air+mechanical strong crushing+suspension fluidization+instant heat and mass transfer+graded sorting, directly dry paste/filter cake/paste materials into powder within a few seconds.
2. Workflow (6 steps)
(1) Hot air preparation
The hot air stove/heat exchanger heats the air to 150-300 ℃ (150-200 ℃ for thermosensitive materials).
(2) Tangential air intake creates a swirling flow
Hot air enters at high speed from the bottom of the drying chamber in a tangential direction, forming a strong rotating upward airflow (≈ 50-60m/s).
(3) Feed+Strong Crushing
The paste/filter cake is quantitatively fed into the bottom by a spiral feeder; The high-speed stirring blade (500-1500rpm) crushes, shears, and peels large pieces of material into small particles.
(4) Suspension fluidization+instant drying (flash evaporation)
Small particles are lifted and suspended by swirling hot air, with a specific surface area in contact with high-temperature hot air; Water evaporates instantly within 0.5 to 5 seconds, achieving "flash evaporation".
grading and sorting
There is a grading device/grading ring at the top:
Qualified fine powder (20-100 mesh) enters the receiving system as the airflow rises;
Coarse wet particles are intercepted by centrifugal force and fall back to the bottom to be broken and dried again.
Gas solid separation+tail gas treatment
The airflow carries powder into the cyclone separator, collecting over 95% of the finished products;
The tail air is further refined by a bag filter for dust removal, and meets the emission standards.
key features
Wide range of feed forms: directly process filter cake, paste, paste, and slurry without pre drying.
Extremely short heating time (in seconds): suitable for materials that are thermally sensitive, easily oxidized, and prone to discoloration.
One step powder production: integrated drying, crushing, and screening, eliminating the need for post crushing and screening.
Fully enclosed negative pressure: less dust, good environment, can be equipped with inert gas for oxidation prevention.
In one sentence: Hot air swirl, mechanical dispersion, suspension for a few seconds, and instant drying into powder.
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