How does a Spray Dryer Work?


When using hot gas to dry a liquid or slurry into a powder swiftly, spray drying is called spray drying. This process can be done in batches or in a continuous way. This way of drying is good for a wide range of heat-sensitive things, like foods and medicines. Many other things may also be done in this manner. AlaquaIn.

Spray dryers are used in various sectors, including the food processing and pharmaceutical industries, both of which are customers of the company’s products. A spray dryer takes a steady flow of liquid and turns it into two different things: a solid form of the solute or suspension and a vapor form of the solvent. Most of the time, either a cyclone or a drum is used to collect the material.

For a stream of liquid to evaporate, a nozzle is used to spray the liquid into a stream of heated vapor.

It causes the liquid to evaporate.

The liquid in the droplets evaporates, which makes solids. The vast majority of the time, a nozzle is employed to make the droplets as minute as humanly feasible to increase the rate of heat transmission and the pace at which the water evaporates. It is done so that both of these things work as well as possible. Most nozzles are either high-pressure single-fluid nozzles or two-fluid nozzles.

In a nozzle with two fluids, one of the fluids is the liquid being dried, and the other is compressed gas. When the pressure is high, it is possible to employ any of these nozzles. Compared to more traditional drying methods, a spray dryer price has a much higher production rate because it works so much better.

In this method, the active medicinal ingredients are spread out evenly inside a polymer matrix. Because of this condition, the active compounds (the drug) have a higher energy level, making it easier for the spice to spread through the patient’s body. No matter how complicated the production facility is, the spray drying process consists of the following five main steps:

Wet Process:

Before the spray drying process starts, the materials that will be dried are in a liquid state. The process before the lab-scale spray dryer manufacturers is meant to get the parts ready so that the spray drying process will work well, leading to a higher yield.

The spray dryer’s ability to turn a liquid into a dried powder in a single step helps increase profits and simplify the process. Spray drying is a method that is used to make an amorphous solid dispensation for use in the pharmaceutical business.


For very fast drying to happen, the incoming liquid stream must be broken up into very small droplets. Using this method will assist ensure that the liquid is uniformly dispersed. It makes the exchange surface, which is the area where water can evaporate from the particles, much bigger.

Contact between the Dry Substance and the Air:

When droplets that have been sprayed come into contact with dry air, the droplets dry out. If the air is warmed before it goes into the spray drying chamber, it will be able to soak up more water, which will speed up the drying process.

It happens because the air will be able to soak up more water. The relative humidity is higher when you leave than when you arrive, but the overall temperature is lower. Additionally, the relative humidity is greater when you exit the building than when you enter it.

Air could be blown to the product against the current from the bottom of the tower or the current from the top. But co-current has a big advantage for spray drying: the air with the highest temperature gets to the particles with the most moisture first, so the particles don’t get too hot. It is often advantageous to act contrary to the prevalent trend in a given setting. However, co-current is much better for spray drying.


The solid particles inside the spray drying chamber move, which makes the drying process happen along the whole length of the chamber. Because the particle and the air around it exchange mass and heat, the moisture on the particle slowly evaporates.

Solids Separation:

After the particles have had a chance to dry, they must be gathered. Cyclones, often used for this separation, can be fitted with filters, making the separation process go more smoothly. The powder is extracted from the air with the use of a cyclone.

Cyclone air moves powder from the spray drier’s lower chamber into the cyclone. The air from the drying chamber is also sent to a different cyclone. This secondary cyclone is in charge of separating any particles that the air may have carried over and put them back into the main product stream. Air that has been through the normal process of rejection but is still hot could be used for pre-heating in some situations because it is still hot.

Anatomy of a Spray Dryer:

There are many different kinds of spray dryers on the market today, and each one has its own set of special features that are made to meet a certain set of drying needs in a certain way. Spray drying may be used to process a variety of food commodities, including starch, rice protein, corn syrup, molasses, honey, and dairy products.

Other foods that can be dried using this method include honey and molasses. The main parts of a dryer are a feed pump, an atomizer or nozzles, an air heater, an air disperser, a drying chamber, powder recovery systems, and process control systems.


The above given is the method used for a spray dryer works. Lab-scale spray dryer manufacturers sell their customers products: evaporators, crystallizers, spray dryers, distillation systems, solvent recovery systems, and heat exchangers made with the most up-to-date technology.

Contact us as soon as possible to get high-quality processing equipment for various industries. Spray dryers that are given in detail above might help you know how it works.