The Working Principle of an Asphalt Smoke Absorption Treatment Device
The Working Principle of an Asphalt Smoke Absorption Treatment Device
1. Exhaust gas source:
The exhaust gas from asphalt mixing is purified by removing dust and smoke through bagged dust removal, and the gas containing asphalt smoke is purified.
2. Harm to human body:
Asphalt and its smoke have irritant effects on the skin, mucosa, and can cause phototoxicity and tumorigenic effects. When humans inhale asphalt smoke, they may experience symptoms such as dizziness, headache, chest tightness, fatigue, loss of appetite, and irritation in the eyes, nose, and throat.
3. Smoke characteristics:
There are many treatment technologies for asphalt smoke, and the commonly used asphalt smoke purification methods include the following:
Mechanical separation method:
When asphalt smoke contains dust, steam or water mist is sprayed into it to increase the particle size of the smoke particles, and then the gas and particles are separated in a settling chamber or cyclone separator to achieve the purpose of purifying asphalt smoke. However, due to the small particle size of the dust, even if they collide with each other to increase their size, the particle size still cannot reach the appropriate size for cyclone dust collection, resulting in poor collection efficiency, so the mechanical separation method is rarely used.
Condensation method:
The condensation method is used as a supplementary means for asphalt smoke purification and is combined with other purification methods (such as adsorption and absorption) for treatment. Asphalt smoke can be condensed through cooling, which can increase the particle size of the smoke mist, thus making it easier to purify asphalt smoke.
Absorption purification method:
The absorption purification method, also known as washing method, is a commonly used method for industrial waste gas treatment. It uses the differences in the solubility of various mixed components in selected absorbents (such as gasoline, diesel, etc.) to purify waste gas.
The absorption purification method is used for asphalt smoke treatment, which involves transferring the gas phase pollutants (actually fine oil mist particles of 0.1-1.0 μm) in the asphalt smoke to the liquid phase (absorbent), thereby achieving the purpose of purifying the smoke. For the treatment of relatively small amounts of asphalt smoke from asphalt concrete mixing stations through dry bag dust removal, using water as an absorbent is the most economical and effective method. The fine oil mist particles in the asphalt smoke are adsorbed by the water and do not dissolve in the water or react to produce new compounds. The majority of them form an oil film that floats on the water surface and can be collected and used as fuel when accumulated to a certain degree. Over multiple cycles, the concentration of emulsion in the water increases, which can reduce treatment effectiveness.