The drying methods for the tannery sludge in existing technologymainly include a natural drying method and a vacuum drying method. The natural drying method has the advantages of low investment and low energy consumption. It is practical for small tanneries located in rural areas that have abundant sunshine. However, the defects are low dehydration efficiency, long drying cycle, large occupied area, attracting insects and having stink.when the sludge is laid at a thick thickness, it cannot be satisfactorily dried. In addition, this drying method is also susceptible to natural climatic conditions. In vacuum, it is very difficult to transfer heat through convection and only be conducted, so the vacuum drying method has the disadvantages of slow heating rate, long drying period and high energy consumption.
Continuous Microwave Hot Air Combined Drying Equipment
The continuous microwave hot air combined drying equipment produced by Leader Microwave Equipment Company is energy efficient.
Tannery sludge/tanner sludge contaminated land
Advantages of microwave hot air combined drying equipment:
1. Energy saving and efficient.
The microwave hot air drying equipment adopts radiation energy transfer, which is the overall heating of the medium, without other heat transfer medium, high speed, high efficiency, greatly shortened drying cycle and reduced energy consumption. Compared with conventional drying technology, it can increase the work efficiency more than four times.
2. Heat evenly.
Since the microwave heating is simultaneous heating inside and outside the material, the temperature difference between the inside and outside of the material is small, and the inconsistency between the inside and the outside of the heating in the conventional heating is not caused, the drying quality of the continuous microwave hot air combined drying equipment is greatly improved.
3. Easy to control.
Due to the rapid adjustment of microwave power and the characteristics of inertialessness, the continuous microwave hot air combined drying equipment is easy to control in time, which facilitates the adjustment and determination of process parameters.
4. Large capacity.
continuous microwave hot air combined drying equipment saves time and improves work efficiency.
5. Product safety and hygiene.
The continuous microwave hot air combined drying equipment has the functions of disinfection and sterilization, can prevent mildew, phlegm and prolong the shelf life.
6. Environmental protection.
Continuous microwave hot air combined drying equipment does not produce three wastes – waste gas, waste water, waste residue.
7. Energy saving.
Due to the double-layer conveyor belt, the equipment footprint can be minimized, and the absorption load in the microwave drying sterilization box can be increased. Continuous drying equipment is more conducive to microwave matching so that energy can be fully utilized.
Different types of continuous microwave hot air combined drying equipment:
48kw Continuous microwave hot air combined drying equipment
80KW Continuous microwave hot air combined drying equipment
120kw Continuous microwave hot air combined drying equipment
Customizable higher power continuous microwave hot air combined drying equipment
As a professional manufacturer, we offer many types of microwave-hot air dryers, you can see their detailed parameter information from the table below:
| Model | DL-48KW | DL-80KW | DL-120KW |
| Microwave frequency | 2450/915MHz | 2450/915MHz | 2450/915MHz |
| Output power | 48KW | 80KW | 120KW |
| Transmission speed | 0-5m / minute（adjustable） | 0-5m / minute（adjustable） | 0-5m / minute（adjustable） |
| Leakage value | ≤3mw/m³ | ≤3mw/m³ | ≤3mw/m³ |
| Size（mm） | 7000x840x1800 | 10500x840x1800 | 12500x1200x1800 |
| Drying capacity | 120-150kg/h | 300-400kg/h/td> | 500-600kg/h |
Remarks: Various types of continuous microwave hot air combined drying equipment can be customized according to user requirements.
Working principle of continuous microwave hot air combined dryer:
Microwave is a non-ionizing electromagnetic energy that propagates at a speed of light of 3 x 105 km per second with a frequency range of 3X102 to 3X105 MHz. The dissipation of the sample by microwave is achieved by two mechanisms of dipole molecular rotation and ion conduction. The molecules move by ion migration and rotation of polar molecules, but do not cause changes in the internal structure of the molecules. The molecules of the substance to be converted from a relatively static moment to a dynamic, that is, after the polar molecules receive the energy of the microwave radiation, the thermal effect is generated by the molecular dipole rotating at a high speed of several billion times per second. Water is a typical polar molecule, which has strong dissipation and absorption of microwaves. The temperature in the electromagnetic field rises rapidly. Therefore, the moisture in the tannery sludge can be rapidly heated and evaporated by microwave irradiation. The hot air device uses electricity as an energy source to heat the air in the blower.The circulating hot air takes the moisture evaporated from the microwave out of the oven from bottom to top.
Schematic diagram 1 of continuous microwave hot air combined drying equipment
Schematic diagram 2 of continuous microwave hot air combined drying equipment
Hopper 1, lifting belt 2, speed regulating motor 3, lower hopper feeder 4, upper conveyor belt 5, lower conveyor belt 6, hot air device 7, microwave tube 8, microwave housing 9, dehumidification device 10, microwave suppressor 12 , guide plate 13, circulating water cooling device 14
Working process of continuous microwave hot air combined drying equipment:
The raw material is lifted from the hopper through the lifting belt to the lower hopper auxiliary device. The material is evenly laid on the upper conveyor belt by the lower hopper auxiliary device; the microwave box body is simultaneously subjected to microwave and hot air heating treatment. The material reaches the discharge end of the upper conveyor belt, the material is evenly laid on the lower conveyor belt by the guide plate and enters the microwave casing again. When the dried material reaches the discharge end of the lower conveyor belt, the material is introduced into the feeder by the discharge guide plate.
Our service:
1.Continuous microwave hot air combined drying equipment is equipped with 1 year warranty and lifetime maintenance service. During the warranty period, if the user encounters problems in accordance with the normal process, our company will provide free repair service. In addition to the warranty period, our company’s repair service will charge the cost of replacement parts.
2.This includes consulting before purchasing equipment and technical issues after purchasing equipment.
3.We are equipped with equipment maintenance and repair information database. It escorts the normal operation of user equipment all the time.
Continuous microwave hot air combined drying equipment customer visit
For many years, our Leader Microwave Equipment Company’s continuous microwave hot air combined drying equipment and ceramic green body microwave drying equipment have been exported to the Middle East, Europe and the United States and other countries and regions.The equipments are highly recognized by foreign customers. Sincerely welcome investors to consult or visit the trial to discuss cooperation.
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