tubular dryer
The tubular dryer is a large-scale continuous tube bundle drying equipment, which was successfully developed after years of scientific research. It absorbs the advantages of traditional tube bundle dryers and improves on them.
tubular dryer Introduction
The tubular dryer is a large-scale continuous tube bundle drying equipment, which was successfully developed after years of scientific research. It absorbs the advantages of traditional tube bundle dryers and improves on them. The tubular dryer adopts indirect heating, and 1-5 rows of heating tubes are arranged in concentric circles of equal length inside the rotating cylinder. Drying is carried out by heat transfer between the heating tubes. This type of drying equipment is also called a heat transfer heating dryer or a steam bundle tubular dryer. The tubular dryer is designed to provide an efficient and energy-saving drying solution, which is suitable for large-scale continuous drying processing of various materials.
The main functions of the tubular dryer
Long Residence Time
The material in the dryer forms a ring-shaped vertical layer and moves slowly downward from top to bottom, with a residence time of up to one hour. This allows sufficient time for the moisture in the material to evaporate.
Efficient Heat Transfer
High-temperature flue gas is directly introduced into the top of the dryer through the central draft flue, where it encounters the wet material just entering the dryer. The material can quickly and extensively absorb the heat from the high-temperature flue gas, rapidly evaporating the surface moisture and effectively eliminating any blockage caused by wet material.
Uniform Hot Air Distribution
The design of the ring-shaped thick material layer ensures that the hot flue gas distributes evenly as it penetrates the wet material layer, preventing the formation of wind tunnels. This enhances heat efficiency, reduces coal consumption, and ensures the quality of drying.
Drying Reflow Zone Design
The design of the drying reflow zone raises the material to a temperature of 80-100℃ in the final drying stage, maintaining it for about fifteen minutes to fully evaporate the residual moisture inside the material. At this point, the exhaust gas temperature reaches approximately 200℃. This exhaust gas is then reintroduced into the hot air furnace mixing chamber via a high-pressure fan, where it mixes with flue gas at about 900℃. This process lowers the high-temperature flue gas to the desired drying temperature (such as 750℃), significantly improving heat energy utilization.
Built-in Dust Removal System
The tubular dryer comes equipped with an anti-condensation long-bag dust collector that utilizes advanced PLC control technology. This system addresses technical challenges such as large fluctuations in flue gas volume, high moisture content, and varying dust properties when drying different materials. It reduces system resistance, enhances the ventilation capacity of the dryer, and significantly increases the dryer’s output.
The structure of the tubular dryer
Main Rotor System
The main rotor system is the core component of the dryer. For a tubular dryer, the rotor typically consists of a series of tubes (such as shell-and-tube) or other shapes (such as disc types). These tubes or shapes rotate to transfer and distribute heat, allowing the material to dry. During rotation, these tubes or discs are supported by bearings at both ends. One end is fixed, while the other end can move freely to absorb thermal expansion.
Drive System
The drive system consists of the main motor and the reduction system (such as cycloidal pinwheel reduction and gear reduction). This system drives the rotation of the rotor system.
Piping System
The piping system includes regulating valves, metal hoses, and rotary joints. It is used to deliver steam or other heat sources into the dryer and to expel the generated waste gas and moisture.
Exhaust and Dust Removal System
This system uses an induced draft fan for exhaust and is equipped with wet dust removal devices to recover hot water and dust, maintaining a clean drying environment.
Heat Source System
The heat source system provides the heat required for the drying process. The heat source can be steam, natural gas, biomass fuel, electricity, etc.
Feeding System
The feeding system, such as a feeder, is used to deliver the material to be dried into the dryer.
Transport System
The transport system, such as a conveyor, moves the material during the drying process to ensure even heating.
Drying Chamber
The drying chamber is where the material undergoes the drying process. The interior of the drying chamber may form different temperature and humidity zones to meet the drying needs of the material.
Discharge System
The discharge system, such as the discharge end, is used to expel the dried material from the dryer.
Main advantages of tubular dryer
High Efficiency and Energy Saving
The tubular dryer uses high-efficiency heating elements, which heat up quickly and have a high energy utilization rate, significantly reducing energy consumption. For certain types of dryers, such as high-temperature heat pump dryers specifically for paper tubes, it achieves the drying effect of traditional methods by absorbing heat from the air while consuming only a small amount of electricity.
Wide Application Range
The tubular dryer is suitable for various types of clothing and other items that need drying, such as towels, plush toys, and even industrial products like paper tubes. Its wide application range is not limited by climate and environment, allowing for 24/7 production.
Health and Environmental Protection
The tubular dryer can dry items without using chemicals, avoiding secondary pollution to clothes and the environment. Additionally, it produces no wastewater, exhaust gas, waste residue, or solid emissions, making it an environmentally friendly device.
Multiple Functions
Besides the basic drying function, some tubular dryers also have functions such as sterilization, mite removal, and refreshing, meeting various user needs.
Easy Operation and High Degree of Automation
The tubular dryer can be designed and installed as a single unit or in combinations, offering flexible usage. It features an automatic lid lifting and ash unloading function, a modular control system with timed temperature settings, and can operate fully automatically without supervision.
High Quality of Dried Products
For certain specific products like paper tubes, using a tubular dryer ensures their verticality, roundness, and hardness. It is especially suitable for drying thick and long paper tubes, effectively maintaining their straightness.
Long Service Life
The main components of the tubular dryer are made from high-quality materials, making it durable and less prone to damage.
Application of tubular dryer
Tubular dryer is widely used for drying small particles of loose materials in chemical industry, light industry, agriculture, food industry, feed industry and other industries. For example, in light industry, it can dry brewer’s grain, bean dregs, grain, sawdust, Marc, sand, slag and other drugs; In chemical industry, it can dry small particles, powdered materials and inorganic minerals and other materials; In starch industry, it can dry corn germ, corn bran, corn (maize) fibre, protein powder, etc: In feed industry, it can dry bran, corn pieces, bean dregs,etc; In fish industry, it can dry fodder of fish and shrimp; In oil industry, it can dry rapeseed (not as seeds). In breeding industry, it can dryer chicken manure, pig manure, cow dung and others.
Technical parameters of tubular dryer
| Model | HKB-1060 | HKB1290 | HKB-1590 | HKB-2090 | |
| Dimension(mm) | 9000×1500×2000 | 12000×1700×2200 | 12000×2000×2500 | 12000×2500×2800 | |
| Output(t/h) | 0.5-1 | 2-5 | 5-10 | 10-20 | |
| Power(kw) | 12 | 18.7 | 25 | 30 | |
| Weight(t) | 6 | 10 | 14 | 20 | |
| Pipe range(m) | 6 | 9 | 9 | 9 | |
| Diameter of pipe(m) | 1 | 1.2 | 1.5 | 2 | |
| Dust catcher | Diameter(m) | 1 | 1.2 | 1.5 | 1.5 |
| Height(m) | 1.8 | 2.2 | 2.5 | 2.5 | |
| Hot air furnace | Inside diameter (mm) | 1500 | 1800 | 2000 | |
| Gas output(Nm³/h) | 1200-1600 | 1500-2100 | 1750-2500 | ||
| Speed(r/min) | 3-5 | ||||
| Reduction of moisture(%) | 40-50 | ||||
| Dryness of finished materials(%) | 5-10 | ||||
| Heating medium | Hot clean air | ||||
| Hot air temp(℃) | <120 | ||||
After-sale Service
- – HKB provides advanced grain safety storage technology to assure your grain silo 100% quality stability.
- – grain silo Quality guarantee is one year after installation and commissioning or 18 months after leaving China Port. Maturity is the first.
- – 7 days x 24 hours service, within 24 hours reply/solve of any technical issues upon request.
- – Routinely telephone track to remove all might be problems grain silo or issues guarantying the whole system grain silo long-lasting safety and reliability.
- – HKB will consider all other needs like customs clearance, sea delivery, insurance, customs tax benefit plan, documentation, etc. So our respected Users feel so relaxed and easy to get the grain silo system well.
