An intermittent dryer is an industrial device that uses a horizontal rotating drum as its core component. It can be heated by coal, wood, gas, or electricity. The rotating drum causes the material to tumble and come into contact with the hot airflow to evaporate moisture, achieving uniform and efficient drying.
Intermittent dryers are industrial drying equipment with a horizontal rotating drum as the core working structure, which is compatible with various heating methods and can efficiently achieve uniform drying of materials.
The core component of an intermittent dryer is a horizontally rotating drum that utilizes various heating methods, such as coal, wood, gas, or electricity, to provide a heat source. During operation, the material enters from the feed end and tumbles continuously as the drum rotates, ensuring complete contact with the hot airflow inside the drum. Moisture evaporates rapidly, and the dried material is finally discharged from the discharge end, achieving uniform drying and high efficiency.
Intermittent dryers are compact in structure, high in output, easy to operate and maintain, and low in investment cost. They adopt a horizontal drum design, which ensures uniform heating and insulation, easy material control, and the self-rotating drum agitation prevents material sticking. Reverse switching allows for automatic material discharge, saving time and labor. Equipped with an automatic temperature control device, they can achieve automated operation and have excellent heating efficiency.
Intermittent dryers are a type of rotary drum dryer. The working principle of a rotary drum dryer is based on the classic physical process of heat and mass transfer. Its core is to create and maintain an efficient drying environment through systematic design, so that the moisture in the material is forcibly discharged in the form of water vapor.There are three stages of the working principle.
Energy is converted into heat energy to heat the air, forming hot air. This hot air acts as the drying medium, providing heat for the evaporation of moisture from the material through convection heat transfer, and carrying the water vapor out, thus completing the drying process. A high-pressure centrifugal fan provides stable power, causing the hot air to form a uniform and forced circulating airflow within the drying chamber along a preset path.
The material to be dried is placed inside a rotating drum. Driven by the drive unit, the drum rotates at a constant speed, continuously lifting and scattering the material. The dryer’s intermittent heating ensures that the surface of each piece of material can fully contact the hot air, maximizing the heat and mass transfer area.
During the contact process, hot air transfers heat energy to the material, causing surface and internal moisture to absorb heat and vaporize. The fan operates continuously, and the stainless steel drum dryer rapidly exhausts the saturated, hot, humid air from the working chamber through the exhaust system, while simultaneously replenishing with reheated dry air to create a dynamic equilibrium. This process is repeated until the internal moisture of the material diffuses to the surface and is evaporated, ultimately reaching the preset final moisture content.
The entire process is precisely monitored and regulated by an intelligent control system (PLC + touchscreen), which allows for programmed settings of key parameters such as drying temperature, time, airflow, and air temperature, ensuring process repeatability and product consistency.
| Model | Motor power
(kw) |
Capacity
(kilograms/batch) |
Drum size | Size |
| 20 | 0.55 | 20 | Φ0.53*0.7m | 1.42*0.7*1m |
| 50 | 0.55 | 50 | Φ0.63*0.98m | 1.8*0.85*1.07m |
| 100 | 2.2 | 100 | Φ0.8*1.05m | 1.92*1*1.27m |
| 200 | 2.2 | 200 | Φ0.95*1.64m | 2.6*1.2*1.5m |
| 500 | 3 | 500 | Φ1*2.9m | 4*1.4*1.5m |
| 1000 | 4 | 1000 | Φ1.2*3.2m | 4.8*1.5*2.1m |
| 1500 | 4 | 1500 | φ1.28*4m | 5.2*1.75*2.3m |
| 2000 | 7.5 | 2000 | Φ1.5*4.5m | 6.2*1.8*2.6m |
| 3000 | 11 | 3000 | φ1.5*6m | 7.8*1.8*2.6m |
| 5000 | 15 | 5000 | Φ1.8*6.6m | 9.3*2.3*3m |
The dynamic tumbling or uniform air distribution design fundamentally solves problems such as uneven drying, clumping, localized overheating, or charring inherent in traditional drying methods. The gentle, adjustable drying curve is particularly suitable for heat-sensitive materials (such as medicinal herbs and grains), maximizing the preservation of the material’s active ingredients, natural color, flavor compounds, and original form.
The equipment operates in a completely enclosed environment, eliminating dependence on external natural conditions such as sunlight, weather, and site conditions, enabling stable production 24/7, 365 days a year. The strict airtightness also effectively prevents external contamination such as dust, insects, and microorganisms, meeting GMP hygiene standards for food and pharmaceutical production.
The highly efficient insulation layer design and precise air supply system greatly reduce heat loss. Some high-end models are equipped with waste heat recovery devices, which can recover and reuse the waste heat in the exhaust gas, resulting in significantly lower overall energy consumption than traditional drying ovens. Automated operation reduces labor costs and the risk of human error.
Batch operation mode is particularly suitable for handling a variety of high-value-added materials. Cleaning is simple when changing materials, with no risk of cross-contamination. The user-friendly control interface makes operation simple and intuitive; ordinary workers can operate the equipment after brief training. The equipment has a small footprint, facilitating production line integration and layout within existing workshops.
Used to enhance the commercial value and shelf life of various agricultural grains such as soybeans, red beans, mung beans, rice, glutinous rice, corn, sorghum, barley, wheat, buckwheat, highland barley, and flour.
Drying various agricultural organic fertilizers, such as distiller’s grains, soybean residue, straw, forage, fermented feed, chicken manure, cow manure, and animal excrement, as well as preparations, to meet their specific moisture content and physical property requirements.
Widely used in the on-site processing of Chinese medicinal herbs (roots, stems, leaves, flowers, and fruits), and in the low-temperature dehumidification of prepared Chinese medicine slices, extracts, pills, and biochemical preparations, ensuring the stability of drug components and controllable quality.
Used for the volume reduction and drying treatment of municipal sludge, industrial sludge, and biomass waste, reducing transportation and subsequent disposal costs and achieving resource utilization.
Mature applications are also found in wood processing (veneer drying), paper products, textile raw materials, and laboratory sample preparation.
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