ROTARY DRYER

1.Drum Dryer
Drum Dryer consists of a rotating drum, usually positioned horizontally, which is heated either by direct contact with hot air or by utilizing hot gases flowing through the drum. Wet or moist materials are fed into the inlet end of the drum and are continuously lifted and showered through the hot air or gas stream as the drum rotates. This process causes the moisture to evaporate, resulting in dried solids exiting from the other end of the drum.

2. Steam Tube Bundle Rotary Dryer
Unlike traditional rotary drum dryers, which utilize a rotating drum or shell, this advanced design incorporates a stationary shell with internal steam tube bundle.
The concept of a steam tube rotary dryer revolves around the principle of indirect heating. Steam is introduced into the tubes, which are positioned inside the stationary shell. The material to be dried is fed into the shell, and as it comes into contact with these rotating hot steam tubes, the heat is transferred to the material, causing moisture to evaporate. The feed material is continuously lifted, showered with the help of shovels provided on tube bundle
The absence of a rotating shell eliminates the need for complicated mechanical components, such as tires, trunnion rollers, and drive systems. This simplification results in a more compact and efficient design, reducing maintenance requirements and enhancing overall reliability.

General Rotary dryer applications are
1.           Braveries - DDGS (Dried Distillers Grain Solid)
2.           Chemical Industries - Salts, Phosphates, Metal sludge, Soda Ash, Silica, Carbon Black.
3.           Petrochemical Industries - Polymers, PVC, HDPE, PTA.
4.           Mineral Industries - Clay, Coal, Fireclay, Limestone, Axonove, Sand, Slag.

 

SPRAY DRYERS

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The spray dryer is a widely used industrial drying equipment that utilizes a unique atomization process to quickly and efficiently remove moisture from liquid or slurry materials. The atomizer or pressure nozzles breaks down the material into tiny droplets, increasing its surface area for effective drying. The drying chamber is designed to provide a large surface area for contact between the droplets and the hot air. As the atomized droplets come into contact with the hot air, rapid evaporation occurs. The moisture within the droplets transforms into vapor. The separation system separates the dry particles from the exhaust air stream. The dry particles are collected at the bottom of the Drying chamber and the separation system. while the clean, air is discharged through the I.D. blower.

General spray drying applications are:
1. Food : Milk powder, coffee, tea, eggs, cereal, spices, flavorings.
2. Pharmaceutical : Antibiotics, medical ingredients, additives.
3. Industrial : Paint pigments, ceramic material, catalyst, foundry fluxes.

AGITATED THIN FILM DRYER (ATFD – 1 m² up to 40 m²) and AGITATED THIN FILM EVAPORATORS (ATFE)

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Agitated thin-film dryer (ATFD) is used for continuous drying of heat-sensitive products under vacuum with total solvent recovery. ATFD provides high throughput by efficiently working under vacuum. ATFD uses indirect heating and drying in inert conditions which is effective for heat and oxygen sensitive products. An Agitated Thin Film Dryer (ATFD) also known as Thin Film Evaporator (TFE) are used to produce free flowing powder from slurry/solution type feed and widely implement in pharmaceutical, chemical & food industries. These are used in situations where the solutions cannot be handled by conventional dryers/evaporators.

SPIN FLASH DRYER

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A spin flash dryer is a type of industrial drying equipment used to dry materials quickly and efficient, which are in cake or paste form. Here is a brief overview of its working process: Feed Bin is designed to provide a continuous and controlled feeding. The agitator is used for stirring and mixing the material. The wet material is fed into the agitator from the feed bin. As the wet material enters the Spin Agitator, it comes into contact with the hot drying medium, which rapidly evaporates the moisture from the material. The fine particles or dried flakes are carried along with the drying medium towards the flash duct. A separation system, such as a cyclone separator & bag filter, is typically employed to separate the dried material from the drying medium. The dried material is collected at the outlet of the cyclone separator & bag filter, while the drying medium is usually discharged through an exhaust system.

General Spin Flash Dryer applications are :
Agro-chemicals, Ceramics, Organic Chemicals, Food products, Pharmaceuticals, Pigments & dyestuffs.

FLUID BED DRYER

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A fluid bed dryer operates on the principle of fluidization, where a hot air is passed through a bed of solid particles, causing them to behave like a fluid. Once the material enters the drying chamber, a stream of hot air or gas is introduced from the bottom of the chamber. This upward flow of air or gas creates a fluidized bed of particle. As the air flows through the bed of material, it lifts and suspends the particles, creating a fluidized state. The fluidization helps in uniform drying and prevents the formation of hotspots. Vibratory Fluid Bed Dryer is an extension of Fluid Bed Dryer. Vibratory motors are used to impart gentle vibrations to the drying chamber and the fluidized bed. The vibrations enhance the mixing and movement of particles, and improve heat transfer efficiency.

General Fluid Bed Dryer applications are :
1. Chemicals, Pharmaceutical & Biochemicals, Polymers, Food & Dairy products.
2. Foundry fluxes, Foundry resin coated sand application, Heating as well as cooling system.