Introduction Of Lab Scale Spray Dryer:
Lab scale spray dryer is a device used in laboratories to dry liquid samples into powder form. The water evaporation per hour is 5L, and the feeding method is peristaltic pump feeding. Working according to the principle of atomization, the Lab scale spray dryer relies on the rotational motion caused by the tangential introduction of the airflow, so that the solid particles or liquid droplets with large inertial centrifugal force are separated from the outer wall. Widely used in food and beverage, pharmaceutical and material science, etc.
Structure Of Lab Scale Spray Dryer:
•Drying room:
The drying chamber is the main part of the lab scale spray dryer, usually a cylindrical or square airtight container. In the drying room, the small liquid droplets sprayed by the sprayer and the hot air alternately flow and collide, so that the water evaporates rapidly and finally forms a powdery material.
• Atomizer:
The atomizer is the key component to atomize the liquid material into fine particles through the high-speed nozzle, and it is also one of the core parts of the spray dryer. Its main function is to atomize liquid materials into small droplets with a diameter of about 10-100 microns, so that they can fully contact with hot air in the drying room and complete rapid drying.
•Heating system:
The heating system of the spray dryer is an important part of the process of heating the gas and/or materials entering the drying chamber, so as to realize the spraying of liquid materials into powder materials. The heating system of the spray dryer is usually heated by means of electric heat, steam, gas or oil.
• Air handling system:
The air treatment system of the lab scale spray dryer is mainly used to deal with the air intake and exhaust in the drying room, and ensure that it meets the conditions of temperature, humidity and cleanliness required by the drying process.
• Powder collection system:
The powder collection system is used to collect the dry powder after leaving the drying chamber. It usually includes a cyclone separator to separate the powder from the drying air and a collection vessel to collect the powder.
Operation Use Of Lab Scale Spray Dryer:
Preparation:
Check whether each part of the spray dryer is in normal operation, such as air intake system, exhaust system, powder collection system, atomizer, heater, etc., to ensure that the equipment can operate normally
Boot:
According to the starting sequence of the equipment, gradually open the air inlet system, heater, atomizer and other parts, and carry out debugging to ensure that the equipment can operate normally and meet the temperature, humidity and other conditions required by the drying process
Dry:
Control the flow and temperature of the air intake and exhaust system to ensure that the temperature and humidity in the drying chamber meet the requirements of the drying process, and make the sprayed material dry quickly into powder in the drying chamber.
Powder Collection:
The powder produced in the drying chamber is collected and stored through the powder collection system to prevent the powder from leaking out and polluting the environment.
Shutdown:
Close each part of the equipment step by step for cleaning and maintenance to ensure the cleanliness and safety of the equipment.
How to use automatic control:
First step:
Setting parameters: such as temperature, wind speed, etc.
Step two:
Turn on the “Auto” button on the screen to start the automatic control function. (In automatic control, the machine will first start the two functions of “fan” and “heating”, and when the temperature rises to near the set temperature, it will turn on the “nozzle” or “needle” function, and wait until the speed of the nozzle reaches the set temperature. After setting the speed, the “peristaltic pump” and “cleaning” functions will be started).
Third step:
When the work is done, just turn off the screen “Auto”. After turning off the automatic, there will be about two minutes of shutdown preparation processing (there will be a prompt on the screen), the main purpose is to clean the nozzle.
Note: After the “Auto” function is turned on, do not operate other functions, otherwise it will be regarded as “manual” operation.
Applications Of Lab Scale Spray Dryer:
Food and beverage industry:
Lab scale spray dryer is often used in the food industry, and spray dryers are widely used in the production of dairy products such as milk powder, whey powder, and lactic acid bacteria powder. Milk or other dairy products are sprayed into fine particles by a spray dryer, and then quickly dried into powder in a drying room.
Chemical Industry:
Lab scale spray dryer is widely used in the production process of solid products in the fields of dyes, pigments, catalysts, resins, adhesives, fertilizers, and chemical additives in the chemical industry.
Pharmaceutical Industry:
Lab scale spray dryer is widely used in the pharmaceutical industry, and can be used for drying processes in the fields of preparing medicines, health products, and Chinese medicinal materials.
Metallurgical industry:
Lab scale spray dryer is mainly used in the metallurgical industry for flue gas treatment and dust recovery in sintering and smelting processes.
Environmental protection industry:
Lab scale spray dryer can be used in the treatment process in environmental protection fields such as waste gas treatment and waste water treatment.
Parameter
| Model | Inlet temperature
(°C) |
Moisture maximum evaporation (kg/h) | Rotating speed (r.p.m) | Diameter of spray
disc (mm) |
Electric heating
power (kw) |
| LPG-5 | 140-350 | 5 | 25000 | 50 | 9 |
| LPG-10 | 140-350 | 10 | 25000 | 50 | 20 |
| LPG-25 | 140-350 | 25 | 18000 | 100 | 36 |
| LPG-50 | 140-350 | 50 | 18000 | 120 | 63 |
| LPG-100 | 140-350 | 100 | 18000 | 140 | 81 |
| LPG-150 | 140-350 | 150 | 15000 | 150 | 99 |
| LPG-200-2000 | 140-350 | 200-2000 | 8000-15000 | 180-340 | According to
the actual situation |
| Model | Inlet temperature
(°C) |
Moisture maximum evaporation (kg/h) | Rotating speed (r.p.m) |
| LPG-5 | 140-350 | 5 | 25000 |
| LPG-10 | 140-350 | 10 | 25000 |
| LPG-25 | 140-350 | 25 | 18000 |
| LPG-50 | 140-350 | 50 | 18000 |
| LPG-100 | 140-350 | 100 | 18000 |
| LPG-150 | 140-350 | 150 | 15000 |
| LPG-200-2000 | 140-350 | 200-2000 | 8000-15000 |
FAQ
Q: What is the difference between fog pressure spray drying and centrifugal spray drying?
A: The drying principle of the pressure spray dryer is the same as that of the centrifugal spray dryer. They both atomize the feed liquid into tiny droplets, and then use hot air to evaporate the moisture in the droplets instantly. The difference is that the centrifugal spray dryer uses an electric high-speed centrifugal atomizer to atomize the feed liquid, while the pressure spray dryer uses a pressure nozzle for atomization.
Q: What are the two types of dust collectors? What are the pros and cons?
A: Advantages of bag filter: collect dry material. Disadvantages: The cloth bag needs to be cleaned or replaced regularly.
Advantages of water film dust collector: when the receiving bucket is full, just pour it out. Disadvantages: Wet materials are collected and need to be discarded or re-dried.
Q: How to debug the equipment if the material sticks to the wall?
A: The sticky wall means that the drying is not complete. The solution is to increase the temperature or reduce the feeding speed of the material.
