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Comparison of advantages and disadvantages of several commonly used humidification methods and intro

time:2020-04-20 source:小编 Views:208

1. Several common methods of industrial humidification and simple comparison

Centrifugal humidification

Advantages: low cost and mature technology.

Disadvantages: Large particles and poor uniformity are not conducive to control product quality and waste water.

Suitable for outdoor humidification.

High-pressure humidification

Advantages: The spray particles are finer and can be used indoors.

Disadvantages: high-pressure air pump required, high water quality requirements, and noise interference.

Wet film humidification

Advantages: clean, no noise.

Disadvantages: large volume and small amount of humidification.

Steam humidification

Advantages: spray particles are small and have been vaporized, isothermal humidification.

Disadvantages: high energy consumption.

Ultrasonic humidification:

Advantages: small particles, low energy consumption, transportable, no mechanical noise

Disadvantages: higher requirements for water quality.

2. Ultrasonic materials and atomization principle

Piezoelectric ceramics: Piezoelectric ceramics are mainly composed of lead zirconate titanate (PZT). In powder raw materials such as zirconia (ZrO2), lead oxide (PbO) and titanium oxide (TiO2), a small amount of After the addition, the ceramic powder is produced by multiple processing procedures, and then compressed into various specifications by a hydraulic press. After molding, it is sintered at a temperature of about 1350 ℃. The resulting product is then plated or stainless steel. After the patch method completes the electrode polarization, it is the finished piezoelectric ceramic wafer.

The principle of ultrasonic atomization: Using the inherent ultrasonic oscillation characteristics of piezoelectric ceramics, through certain oscillation circuit means to resonate with the natural oscillation frequency of piezoelectric ceramics, the liquid in contact with piezoelectric ceramics can be directly atomized into tiny 1--3μm Particles. The principle is that the ultrasonic vibration of the circuit is transmitted to the surface of the piezoelectric ceramic vibrator, and the piezoelectric ceramic vibrator will produce an axial mechanical resonance change. This mechanical resonance change is then transmitted to the liquid in contact with it, causing the liquid surface to bulge and bulge Cavitation occurs around, the shock wave generated by this cavitation will continue to repeat at the vibration frequency of the vibrator, causing a surface tension wave of limited amplitude to be generated on the liquid surface. The wave head of this tension wave scatters, atomizing the liquid and generating a large amount of negative ions.

Atomization unit and atomization amount: Since the oscillation frequency of the separately formed piezoelectric ceramics is inherent, only one oscillating shock wave can be generated. If you need to increase the amount of atomization, you can only use multiple groups working in parallel to achieve. Considering the life of piezoelectric ceramics in the prior art, the vibrator power of each unit is 0.25W and the amount of atomization is 0.3L. Because the surface tension of the liquid solution is different, the amount of atomization of various liquids is not exactly the same. The greater the surface tension of the relative liquid, the smaller the amount of atomization, and vice versa. The impurities contained in the liquid are different, which have a certain impact on the service life, atomization effect and maintenance cycle of the equipment. Taking water as an example, when the content of calcium, magnesium and silicic acid in water is high, various humidification methods are to a certain extent. It will be affected, affect the humidification efficiency, and even cause equipment damage. During ultrasonic humidification, when the calcium, magnesium, and silicic acid content in the water is high, it will cause the nebulizer itself to be fouled, and the humidification environment is polluted.

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