Stainless Steel Rotary Dryer

As an important type of rotary drum dryer, stainless steel rotary drum dryer is widely used in the field of industrial and agricultural material drying. Its core advantage lies in the use of stainless steel (such as 304, 310S, etc.), which is particularly suitable for drying easily polluted materials (such as food, agricultural and sideline products, etc.), while taking into account high efficiency, energy saving and easy operation. Stainless steel rotary drum dryer is an efficient and continuous operation drying equipment. With its corrosion resistance, good hygiene and strong adaptability.

Main Structure and Materials

The main components of a stainless steel rotary drum dryer include:

Component	Description	Common Materials/Forms
Drum	The main body where material tumbles and dries. Typically designed with a slight incline (e.g., 3-5 degrees) and adjustable rotation speed.	304 Stainless Steel, 310S Stainless Steel, or Carbon Steel with Stainless Lining
Lifting Flights	Welded to the inner wall of the drum in various shapes (e.g., arc-shaped, spiral) to lift and scatter material, increasing the heat exchange area.	Usually made of stainless steel
Transmission System	Provides power to rotate the drum, including motor, reducer, gear (or pulley), etc.
Support Device	Includes support rollers (to support the rotating part) and thrust rollers (to prevent axial movement).	Support rollers may use wear-resistant and corrosion-resistant materials
Sealing Device	Installed at the feed and discharge ends and drum connections to prevent heat loss and dust leakage.
Heating System	Provides the heat source in various forms.	Electric heating, steam heating, gas hot air furnace, etc.
Feeding & Discharge System	Enables continuous and uniform material supply and product collection.	Can be equipped with screw conveyors, bucket elevators, etc.
Control System	Modern dryers often feature automatic control systems for precise adjustment of temperature, speed, air volume, etc.	PLC (Programmable Logic Controller), touch screen, etc.
Insulation Casing	Wraps around the drum to reduce heat loss and improve thermal efficiency.	Often uses high-quality aluminum silicate insulation wool, etc.

Working principle

The operating principle of a stainless steel rotary drum dryer is primarily based on heat exchange. During operation, wet material enters a slightly inclined, adjustable rotating drum from the feed end. As the drum rotates, lifters (lifting plates) on the inner wall continuously lift and drop the material, causing it to tumble repeatedly within the drum, forming a uniform curtain of material.

At the same time, hot air (the heating medium) flows through the drum in either co-current or counter-current flow, depending on process requirements, effectively exchanging heat with the tumbling, dispersed wet material. The moisture in the material gradually evaporates and is carried away by the hot air, with the dried material then discharged from the discharge end. Exhaust gas containing water vapor and fine dust is typically treated with a dust removal device before discharge.

Main Applicable Industries

Industry	Typical Materials	Device Advantages
Food and Agricultural By-Products	Soybean residue, distiller’s grain, starch residue, dried fruits and vegetables	Stainless steel material prevents pollution, good drying uniformity
Feed and Fertilizer	Fish meal, organic fertilizer, straw, drug residue	Can be connected to pelletizing and packing processes to form a complete production line
Chemicals and Mining	Metal powders, kaolin, activated white earth, gangue	Can withstand high temperatures (up to 1000°C), flexible heat carrier selection

Stainless steel rotary drum dryers are widely used in various industries, including:

Food and agricultural product processing: Used for drying vegetables, fruits, tea, bean dregs, roasted rice, roasted wheat, etc., as well as for roasting and sterilizing materials.

Chemical industry: Used for drying chemical raw materials, mineral powders, fertilizers (such as phosphate fertilizers and ammonium sulfate), salts, molecular sieves, etc.

Mining and metallurgy: Used for processing ores, slag, quartz sand, bentonite, silicon carbide, iron powder, coal powder, etc.

Environmental protection and waste treatment: Used for drying sludge, distiller’s grains, etc.

Textile and other light industries: Large industrial dryers can be used to dry textiles and clothing. They are also used in the pharmaceutical and electronics industries.

Stainless steel rotary drum dryers are widely used primarily due to their advantages:

Excellent corrosion resistance and hygiene: Stainless steel effectively resists corrosion from moisture, certain chemicals, and other materials, extending equipment life and meeting the stringent hygiene requirements of industries such as food and pharmaceuticals.

Strong material adaptability: Adjustable speed, temperature, air volume, and lift plate configuration can be tailored to the drying needs of materials with varying characteristics, providing operational flexibility.

High production efficiency and continuous operation: High processing capacity and 24-hour continuous operation make them ideal for large-scale industrial production.

Uniform and stable drying: Materials are continuously scooped up and down within the drum, ensuring full contact with the hot air, resulting in uniform drying.

Relatively stable and reliable operation: The simple structure ensures easy operation, minimal malfunctions, and low maintenance.

Energy-saving and environmentally friendly: Insulation materials can be used to reduce heat loss, and dust removal devices (such as pulse dust collectors) can be installed to reduce dust emissions and improve the working environment.

When selecting a suitable stainless steel rotary drum dryer, consider the following:

Material Characteristics: Initial and final moisture content, viscosity, particle size, thermal sensitivity, and corrosivity are key factors.

Heat Source Selection: Choose a heat source such as steam, natural gas, fuel oil, electricity, or coal based on site conditions, cost, and environmental requirements.

Production Capacity Requirements: Determine equipment specifications based on the required hourly or per-shift throughput (output).

Material Requirements: Choose either all-stainless steel (such as 304 or 316L) or carbon steel lined with stainless steel, depending on the corrosiveness and hygiene requirements of the material.

Environmental and Automation Requirements: Consider whether an advanced dust removal system and the degree of automation are required.

stainless steel rotary drum dryer video

 Technical Parameters

Model	Cylinder diameter(mm)	Cylinder length(mm)	Cylinder volume(m3)	Cylinder rotary speed (r/min)	Power(kW)	Weight(t)
0.6×5.8	600	5800	1.7	1-8	3	2.9
0.8×8	800	8000	4	1-8	4	3.5
1×10	1000	10000	7.9	1-8	5.5	6.8
1.2×5.8	1200	5800	6.8	1-6	5.5	6.7
1.2×8	1200	8000	9	1-6	5.5	8.5
1.2×10	1200	10000	11	1-6	7.5	10.7
1.2×11.8	1200	11800	13	1-6	7.5	12.3
1.5×8	1500	8000	14	1-5	11	14.8
1.5×10	1500	10000	17.7	1-5	11	16
1.5×11.8	1500	11800	21	1-5	15	17.5
1.5×15	1500	15000	26.5	1-5	15	19.2
1.8×10	1800	10000	25.5	1-5	15	18.1
1.8×11.8	1800	11800	30	1-5	18.5	20.7
1.8×15	1800	15000	38	1-5	18.5	26.3
1.8×18	1800	18000	45.8	1-5	22	31.2
2×11.8	2000	11800	37	1-4	18.5	28.2
2×15	2000	15000	47	1-4	22	33.2
2×18	2000	18000	56.5	1-4	22	39.7
2×20	2000	20000	62.8	1-4	22	44.9
2.2×11.8	2200	11800	44.8	1-4	22	30.5
2.2×15	2200	15000	53	1-4	30	36.2
2.2×18	2200	18000	68	1-4	30	43.3
2.2×20	2200	20000	76	1-4	30	48.8
2.4×15	2400	15000	68	1-4	30	43.7
2.4×18	2400	18000	81	1-4	37	53
2.4×20	2400	20000	91	1-4	37	60.5
2.4×23.6	2400	23600	109	1-4	45	69.8
2.8×18	2800	18000	111	1-3	45	62
2.8×20	2800	20000	123	1-3	55	65
2.8×23.6	2800	23600	148	1-3	55	70
2.8×28	2800	28000	172	1-3	75	75
3×20	3000	20000	14	1-3	55	75
3×23.6	3000	23600	170	1-3	75	85
3×28	3000	28000	198	1-3	90	91
3.2×23.6	3200	23600	193	1-3	90	112
3.2×32	3200	32000	257	1-3	110	129
3.6×36	3600	36000	366	1-3	132	164
3.8×36	3800	36000	408	1-3	160	187
4×36	4000	36000	452	1-3	160	195