1、 Overview

In the production process of various asphalt based waterproof materials, it is necessary to heat, transport, and produce asphalt mixtures that meet various process requirements for production use. During this process, a large amount of asphalt fumes will be generated. Smoke contains various organic compounds, including carbon ring hydrocarbons, ring hydrocarbon derivatives, and other compounds, which have harmful effects on human health. Asphalt smoke contains various polycyclic aromatic hydrocarbons such as benzo [a] pyrene, benzo [a] anthracene, and carbazole, and most of them are carcinogenic and strongly carcinogenic substances. The particle size is mostly between 0.1-1.0 μ m, with small ones being only 0.01 μ m and large ones being about 10.0 μ m, especially the various carcinogenic substances represented by 3,4-benzo [a] pyrene. The main way it endangers human health is by attaching to dust particles below 8 μ m and being inhaled into the body through the respiratory tract. Therefore, it is necessary to purify and treat asphalt flue gas to meet atmospheric environmental standards for emissions. The asphalt flue gas emissions treated by this purification system meet the requirements of the "Air Pollutant Emission Standard GB 16297-1996".

2、 Process flow and working principle

1. Process flow

Asphalt waste gas - Spray washing tower - Centrifugal fan - Organic waste gas adsorption device - Centrifugal fan - Standard gas emission.

2. Process principle

The exhaust gas first enters the dust removal and washing tower. The asphalt exhaust gas is fully combined with gas and liquid under the centrifugal force of the ventilation fan. The gas enters the tower through the air inlet at the bottom of the tower and quickly fills the space at the inlet under the power of the ventilation fan. Then, it rises uniformly. The alkali solution is evenly distributed to various distribution pipes under the action of the circulation pump and fills the entire tower space in a house shape. It is completely saturated with the rising gas and quickly undergoes a thorough chemical reaction. The remaining untreated exhaust gas enters the organic exhaust gas adsorption device. The exhaust gas is evenly distributed through the guide hood and sent into the organic exhaust gas adsorption device. After the airflow enters the tower through the adsorption bed of the tower's internal packing, harmful chemical components in the airflow are adsorbed by the adsorbent, and clean air is discharged from the outlet inside the tower. The condensed water is discharged outside the tower through the collection tank and discharge pipe.

3、 Technical parameters and selection

Due to different technical parameters such as gas concentration and temperature, this treatment equipment should be designed and selected according to actual conditions. Our company has a specialized design program that can design specific technical parameters that meet the standards according to the actual situation.

The design conditions that users need to provide include:

1. Provide a usable site for equipment operation;

2. Provide the amount and concentration of exhaust gas, temperature, and the standards required for treatment;

3. Provide whether the control mode is manual or automatic, and the degree of control achieved;

4. Provide us with the equipment and supporting facilities, pipelines, and accessories that we need to supply.