High Efficiency Rotary Drum Dryers from Verified Manufacturer in China

What Is a Rotary Drum Dryers?

Rotary drum dryers, otherwise known as rotary dryers, are highly effective and widely used as an industrial option to dry bulk solids by removing humidity. They are used in industries that work on industrial materials, mining, etc. The rotary drum dryer machine is chosen because of its robust processing capability and its simple operability.

What Are The Applications of Rotary Drum Dryers?

Rotary drum dryers are the most cost-effective and versatile choice when choosing to acquire a new dryer of the industrial type. This is because of their efficiency and capacity to accommodate new purposes. Based on the rotary drum dryer working principle, they are often used in the chemical, mining, and mineral industries.

In the food industry, their application is for the dehydration of waste products such as lemon peels, tiger nuts, and feedstuff for animals. Other materials dried include limestone, clays, starch pulp, flotation concrete, beet pulp, sludges, also used in the production of minerals and fertilizers, and other materials for soil amendment such as potash, NPK, manure, DAP. The dryers are used on both the end product and the raw feedstock.  A couple of pharmaceutical industries also make use of the industrial rotary drum dryer for ethanol production. Brewers have also been known to dry and reuse waste or byproducts.

How Does a Rotary Drum Dryer Work?

Industrial rotary drum dryers are highly useful for the drying of bulk sludges and solids. They are a great choice because of their ability to generate uniform products regardless of variance in the input materials.

This rotary drum dryer machine works by mixing the feedstock that has been input in the rotating machine in the presence of hot air (drying air). This heat is sometimes used indirectly to avoid direct contact between your dryer machine and the material.

The drum is angled at a slight horizontal tilt to allow gravity to aid in moving the feedstock through the drum dryer. As the rotary drum rotates, conveyor belts assist in lifting by picking up the material and dropping it through the air. This process maximizes the efficiency of heat transfer.

The material that passes through the drum of the dryer is dried by the hot air flowing through it.

The dried material is thereafter collected at the output stream. The fine dried particles are retrieved by the dust collector after drying, and exhaust gas is also discharged.

The source of heat for the machine is usually diesel, coal, gas, steam, wood, and so on.

The working principle of the drying way of the dryer machine could either be in the parallel flow or the counter flow. In the parallel flow, the hot air comes in contact with the wet material as it enters the drum dryer. This leads to fast evaporation and fast cooling of the hot air used in the process. This allows the dryer machine to work at a cooler temperature than that of the counterflow.

In the counterflow, however, the hot air and the feedstock material are introduced into the dryer from opposite ends. The dry material and the exhaust vapor also exit the machine at opposite ends.

Types of Rotary Drum Dryers?

There are several different types of rotary dryers whose properties are adequate for mixing, drying, chemical reactions, the recovery of solvents, and the accumulation of solid particles. The main types of rotary drum dryers include:

1. Direct rotary dryer
2. Direct rotary kiln
3. Indirect rotary drum dryer
4. Indirect rotary calciner
5. Direct Roto-Louvre dryer

The direct rotary drum is the most preferred one for the use of all the types stated above. This is because of direct contact between the material and the hot air (drying air). It is majorly constructed from carbon steel. They are commonly used in the construction and mining sectors.

How To Choose The Best Rotary Drum Dryer for Pellet Production?

Rotary drum dryers are constantly being used in a wide range of applications in chemical industries, mining, fertilizer, for building materials. Choosing the right one can be a tedious task; however, several factors need to be put into consideration. Some of these factors include:

The Work Surroundings (Location)

Humidity, elevation, temperature, which all factor out to a location, all play major roles when choosing the right rotary drum dryer. These factors can all affect the performance of the dryer in the sense that an elevated area/location would mean a decrease in the amount of oxygen in the location. This makes the air less dense and difficult to combust. 

An elevated location would require an increase in the size of the dryer’s fan to equalize the working conditions. Dry air would ensure the right size for pellet production.

A Customized Rotary Drum Dryer

Keeping in mind that the processing environment affects the working process of the drying system, the characteristics of the chosen material and how the dryer would work around the features determines the type of dryer needed.

Customized equipment with characteristics that include moisture content, constructed with perfect carbon steel material, bulk density, angle of repose, and others would be a great choice.

The Type of Heat

The heat type supplied to the drum of the dryer could either be direct or indirect heat. The direct heat supplies the heat to the dryer in either direct a counter-current flow or a co-current flow. This means that the heat supplied could either travel in the same direction as the material or the opposite direction of the material.

There are instances where direct heat is not the best option. This is in cases where consumer products are dealt with as it may not be proper for the products to come in contact with combustion gases from the direct heat supply. In such cases, an indirect heat supply is the best option. The heat from this system is transferred to the chamber through the shell of the rotary drum dryer. It is the best option for handling consumer products.

What Are The Advantages of Rotary Drum Dryers?

Rotary drum dryers are commonly used in industrial processes for their uniformity in the drying of bulk solids, high capacity for operation. These drum dryers are used both in post drying and pre-conditioning operations. The post drying method reduces the moisture content of the final product while the preconditioning dries the material before further processing.

Some of the advantages of rotary drum dryers in the processing of bulk solids include:

1. High Production Capacity

The capacities of a rotary drum dryer could range from 1ton/hr to about 200 tons/hr. High processing capacity is a necessity in many processing industries.

2. Ease of Operation

The operation of this machine is fairly hands-off as it does not require constant monitoring. They, however, require adjustments to variables when needed.

3. Creation of a Refined Product

The rotating action of the small rotary drum or cylinder rounds the pellets being dried, which knocks off loose edges and creates finer products.

4. Processing of Heavy-Duty Materials

Although the rotary drum dryers are used in the production of fine or refined products, they are also used in the production of heavy materials used in mining industries such as potash, limestone, ore, and so on.

5. Consistency in Processing

A rotary dryer would continue to produce a fairly uniform product regardless of changes in particle size and changes in moisture content of the material. The rotating drum of the dryer prevents material clumps as it tumbles the rough and gives off evenly dried final products.

How To Buy an Affordable Rotary Drum Dryer?

Purchasing a rotary drum dryer is quite easy as there are a couple of reputable manufacturers out there that sell for pocket-friendly prices. Ensure that the equipment you purchase is versatile, and you should have information about its desired throughput, inlet and outlet temperature, inlet and outlet moisture, expected particle size (minimum, maximum, or average), and so on. You could get your rotary drum dryer, however, from:

Taichang

This company makes it their priority to satisfy their customer’s needs with top-notch craftsmanship. Their rotary dryers can handle evaporation rates between 1000 and 60000 lbs. of water evaporation/hr. The drying systems work with gas, liquid fuel, and solid fuel. They also have the necessary pollution prevention units put in place that control contaminants such as SOx, NOx, and other particulates. You can go ahead and check the company’s website to look at other features, get a quote and ask questions if you need.

Feeco

Feeco is a producer of high-quality, high-capacity rotary drum dryers, with numerous installations around the world. The dryers are engineered with unique characteristics to produce optimally dried materials. Contact them through their website to request a quote, request prices, or ask other questions you might have.

Hauni

Hauni is a well-known manufacturing company in Germany. They fabricate industrial drum dryers used for tobacco production, and that can also be used as a cooler. You could check the company’s website to request a quote or to request prices.

Haarslev

Haarslev is a processing technology company that produces safe and economical rotary drum dryers used for granulation and drying purposes. Their drying system includes the latest safety enhancements that include an elegant process control system.

How To Use a Rotary Drum Dryer for Beginners?

The process of using the rotary drum dryer is quite an easy one. The basic working principle will be described below with the aid of an example. With proper staff training and technical guidance, to operate the machine, one worker would be enough.

Using the example of wet river sand, it has high water content and takes a lot of time to dry naturally. The naturally dried sand cannot meet the working requirements of proper construction sand.

Wet sand gotten from the river is spread to let excess water evaporate before it is lifted to the first work area. The drum is preheated before the inlet stream is fed.

The sand is thereafter placed on the lifting device using a conveyor belt which increases the area of heat exchange between the hot air and the sand.

The moisture in the sand quickly evaporates to form water vapor as it comes in contact with hot air. The vapor is pumped away by a draft fan. The dried sand falls by the effect of gravity, which is considered to have low moisture content and the required moisture state. This dry sand is then moved by a conveyor belt to the discharge port. All the dried sand slides to this area to complete the drying process in the open.

As seen above, the process is an easy one that requires only one worker whose work might be to unload the material, regulate the temperature and other working parameters.

The heat from the hot air furnace is usually 300-500 degrees to produce thermal efficiencies of about 30-70 %. Gas generators are usually used in place of combustion furnaces in terms of environmental protection and energy-saving. In most cases, gas generators are a better choice because of their low heat loss, simple structure, and low cost of investment.

How To Maintain Rotary Drum Dryers?

To maximize the durability, efficiency, and reliability of your rotary drum dryer, you must ensure basic dryer maintenance. With appropriate preventive maintenance, your machine should be properly functional for years. Most of the issues surrounding rotary drum dryers are around the reduction of tramp air or fugitive air. There are also drum problems that could exhibit themselves as cracking and are usually caused by worn tire shims, lack of rigidity in the head plate and the shells. To maintain your rotary drum dryers and ensure plant safety, one has to:

• Ensure that there is no leakage in your fuel supply. Also, excess air used in combustion could increase the oxygen levels, which could expose your dryer to fire risks.
• Ensure that your hot air burners have good seals. Change faulty or leaky ones to prevent explosions.
• Ensure that your rotary drum dryers are cleaned; otherwise, tramp air can build up and compromise the capacity of the machine.
• Ensure that there is a good insulation system in place. Replace faulty ones as soon as possible. The less heat is lost to the environment; the less heat the dryer is required to produce. This conserves energy.