Understanding Particle Formation And Factors Affecting Particle Size in Spray Drying

Spray drying is a popular method that removes the moisture from different types of slurries, solutions, suspensions, and emulsions. It is used in the manufacturing of pharmaceutical drugs, a wide range of chemicals, and for producing food items. Additionally, a spray drying machine is also used to purify pharmaceutical products and to increase the shelf life of food items. This versatility of spray drying is a definite advantage for industrial manufacturers.

Spray drying is a complex process, and manufacturers should be aware of the various factors that affect particle size and the quality of the spray-dried powder. This will ensure greater yield with smoother operations and better resource utilization. In this blog, we will discuss these factors to provide you with a comprehensive understanding of the spray drying process.

Factors such as feed rate, atomization type, spray drying equipment dimensions, and others have a direct impact on particle size and surface area. This, in turn, influences the product quality, benefiting the manufacturers. Let's take a look at these factors in detail when you use a spray dryer:

1. Inlet and Outlet Air Temperature

Inlet air is the high-temperature air that enters the system to evaporate the moisture content from the material, typically ranging from 30-300℃. Passing hotter gas increases the evaporation rate and completes the spray drying process quickly. However, increasing the temperature can be counterproductive for heat-sensitive food items and certain pharmaceutical drugs.

On the other hand, outlet air is what leaves the system after drying the material. Lower outlet air temperature indicates incomplete drying and higher moisture content in the final product. However, having a higher outlet air temperature can result in reduced product quality due to excessive heat absorption. Achieving the desired moisture reduction requires a precise balance of inlet and outlet temperatures.

2. Atomization Type

Atomization is considered a crucial process in the spray drying process. It is the process of breaking a liquid feed into fine droplets so it can dry quickly into powder when exposed to hot air. Consequently, this controls the particle size in the final powder, drying rate, and ensures uniform drying. That is exactly why choosing the right type of atomizer is crucial. The following are the different types of atomizers:

Pressure Nozzle Atomizer – liquid forced at high pressure through a small orifice; common for food products.

Two-fluid Nozzle – compressed air (or steam) breaks the liquid into droplets, making it suitable for lab-scale and heat-sensitive materials.

Rotary (Centrifugal) Atomizer – liquid is flung off a rapidly spinning disk/wheel into droplets; used for large-scale, continuous spray drying.

3. Feeding Rate

The feeding rate, or the rate at which the feed enters the spray drying vessel through atomization, has a significant influence on the final product quality. Slow feed rate results in a larger particle size and a significantly reduced moisture content. Larger particles increase the flowability and make them easier to collect, reducing the wastage.

On the contrary, high-speed feeding can lead to incomplete drying and force the need for multiple drying cycles. However, faster feeding results in higher production yields and is ideal for heat-sensitive materials. In conclusion, achieving an ideal flow rate can enhance production efficiency by ensuring the proper utilization of inlet air and facilitating the evaporation of water droplets from the product.

4. Spray Dryer Dimensions

Spray dryer machine's diameter, chamber height, and shape have a significant impact on the product quality and spray drying efficiency. A drying chamber with a wider diameter increases energy consumption, but provides the particles with more space to spread. This increases the rate of evaporation and reduces the risk of agglomeration. Similarly, a longer drying chamber offers the liquid more time to evaporate, ensuring complete drying.

 

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Applications of spray drying spread across multiple industries due to their ability to handle gel, slurries, suspensions, pastes, and emulsions. The versatility of spray dryers makes them ideal for drying a wide range of materials and solutions across different industries. We have some of the key applications of a spray drying machine below:

Industry	Applications of Spray Drying
Food & Beverages	Milk powder production, Instant coffee & tea, Flavors, colorants, and sweeteners, Egg powder & protein powders
Pharmaceuticals	Controlled drug delivery systems, Dry powder inhalers (DPIs), Antibiotics & enzymes, Encapsulation of active ingredients
Chemicals	Detergents & catalysts, Polymers & resins, Fertilizers, Pigments & dyes
Biotechnology	Probiotics encapsulation, Enzyme stabilization, Vaccines & biologics preservation
Ceramics & Materials	Ceramic powders for electronics & coatings, Advanced ceramics (e.g., zirconia, alumina), Metal oxides
Cosmetics	Powdered fragrances, Encapsulated active compounds in creams & lotions, Sunscreens & pigments
Environmental	Wastewater treatment products, Flue gas desulfurization byproducts, Encapsulation of hazardous waste

The spray drying technique is used for both small-scale research purposes and large-scale production. At Acheive Chem (Sub brand of Xi'an Rich Smart Technology Co.,Ltd), we design and manufacture spray dryers that cater to both these needs. We ensure that you get highly optimized drying solutions with lower energy consumption and greater throughput in both cases. We offer the following spray drying solutions:

Lab Spray Dryer

Ideal for small-scale research to manufacture dry powders from liquid slurries and solutions in lab for R&D.

Features

Made with durable materials, SS304, and high-quality glass

Touchscreen controls for better control over critical parameters

Two liquid nozzles, concentric coaxial, uniform atomization

Transparent glass drying chamber for real-time control over operations

Additional custom features include: Spray head cooling system, filtration device, magnetic stirring device for adequate feeding

Pilot Scale Spray Dryer

PIlot scale manufacturers are used for the intermediate production level and play a crucial role in the upscaling process. Our pilot-scale spray dryers are the essential component that will help you achieve smoother and more economical upscaling.

Features

Automatic bag filter for higher efficiency

Large-scale collection tank and drying chamber with customizable dimensions

The centrifugal atomizer and the two-fluid nozzle atomizer

Mirror-polished inner wall, ensuring easy collection of powder

Inlet air temperature: Room temperature -250℃

Custom Spray Drying Equipment

In case the standard equipment mentioned above does not satisfy your production needs, we have fully customized drying solutions. Our R&D department will understand your requirements and production goals to design optimized spray drying solutions for you. Additionally, the process is convenient, and our engineers will keep you updated with the equipment development and schedule.

ISO 9001 certificate, a clear indication that you will get uncompromised material quality and production adhering to global standards

Special attention to quality control, where each process goes through strict QC/QA checks

Flexible solutions with customized services, saving your precious resources

Providing cost-effective solutions

Expert consultation, post equipment delivery services, and assistance in installation.

Spray drying is a critical process where multiple factors impact the final product quality and production capacity. Partnering with Rich Smart Tech will enable you to handle all these crucial aspects to achieve a significantly improved operational efficiency. Get expert consultation and reliable spray drying equipment. Contact us to know more details!

FAQs

Q.1: What is the role of spray drying in increasing the shelf life of food items?

A: Spray drying removes the moisture content from the food particles. This reduces the growth of microorganisms that need water to grow. It also makes the food items easy to pack and transport without compromising their nutritional value.

Q.2: What are the essential quality certificates for spray drying equipment?

A: CE, TUV, BV, SGS, PED, and ATEX are some of the quality standard certificates that you should look for before purchasing the spray drying equipment. It will benefit you in a couple of ways:

First, it will ensure safe operations with a high-quality yield

And second, certified equipment helps you with the compliance regulations and audit checks

Q.3: Why is it critical to choose the right Spray dryer manufacturer?

A: Having the right spray dryer manufacturer means:

On-time delivery of equipment, without unnecessary details

Pre-purchase consultation with experts to ensure better decision-making

Post-installation services including professional assistance with installation and troubleshooting any malfunctions

Technical prowess to manufacture custom equipment

Q.4: How to ensure efficient spray drying at an industrial scale?

A: Efficient spray drying at an industrial scale is not easy to achieve, as the increase in size introduces different variables. However, here are some critical tips:

Choose the appropriate atomization type

Maintain an ideal inlet and outlet air flow

Automate the feeding process to ensure precision

Start with a pilot-scale plant before jumping to actual industrial-scale production.

You can consult with our experts for an in-depth session on how to increase your spray drying efficiency. In this personalized consultation session, you will gain valuable insights that will have long-term production benefits.

 

Interested in a SPRAY DRYER for your Lab/Factory ? [Seack an Engineer now]