Asphalt fumes

(1) Asphalt fumes are characterized by easy adhesion and flammability above a certain temperature. In the process of asphalt fume collection, transportation and smoke elimination, it is very easy to stick to the surface of pipes and equipment to form liquid to solid asphalt. The solidified asphalt is difficult to remove, often causing pipe blockage, equipment damage, so that the system can not operate normally.

(2) Asphalt fume components are extremely complex, varying with the source of asphalt. Asphalt fumes have both asphalt volatile components condensed into solid and liquid particles, but also vapor state of organic matter, some organic matter is polymer, will cause serious environmental pollution.

(3) The smoke contains a variety of organic compounds, including carbocyclic hydrocarbons, cyclic hydrocarbon derivatives and other compounds, many of which are hazardous to human health.

Asphalt fume emission sources are very wide

(1) Industrial thermal processes that produce asphalt, such as coking and oil refining;

(2) Processes that heat asphalt to make asphalt products;

(3) The process of heating asphalt for paving roads, repairing houses or for anti-corrosion coatings

(4) Asphalt fumes contain benzo(a)pyrene, benzanthracene, carbazole and many other polycyclic aromatic hydrocarbons, and most of them are carcinogenic and strong carcinogenic substances, with particle size mostly between 0.1 and 1.0μm, the smallest being only 0.01μm and the largest being about 10.0μm, which are represented by 3,4-benzopyrene as a variety of carcinogenic substances. The main way to endanger human health is to attach to the dust below 8um and be inhaled through the respiratory tract.

Exhaust emission standards, with reference to the "Volatile Organic Compounds Control Emission Standards" (GB37822-2019), "Shandong Province Volatile Organic Compounds Emission Standards" (DB37-2801), the following table of exhaust emission standards:

(1) information provided by the owner in relation to the project

(2) "Law of the People's Republic of China on Environmental Protection" (2015-01-01)

(3) "Air Pollution Prevention and Control Law of the People's Republic of China" (2016-01-01)

(4) Ambient Air Quality Standards (GB3095-2012)

(5) "Law of the People's Republic of China on the Promotion of Cleaner Production", Decree No. 72 of the President of the People's Republic of China

(6) National Environmental Protection "Thirteenth Five-Year" Plan

(7) "Comprehensive Emission Standards for Air Pollutants" (GB16297-1996)

(8) "Emission Standards for Odor Pollutants" (GB14554-1993)

(9) "Environmental Protection Design Code for Construction Projects" (GB50483-2009)

(10) "Design Code for Heating, Ventilation and Air Conditioning" (GB50019-2003)

(11) "Building Design Fire Code" (GB50016-2014)

(12) "Code for the design of power supply and distribution systems" (GB50052-2009)

(13) "Emission Standards for Volatile Organic Compounds Control in Industrial Enterprises" DB13/2322-2016

The proposed process route uses "catalytic combustion + dust removal + odor removal" for effective exhaust gas treatment. The process equipment diagram is as follows:

催化燃烧+除尘+除味

(1) After the waste gas is pretreated to remove dust and particulate matter, it is sent to the activated carbon adsorber. When the activated carbon adsorber Ⅰ is close to saturation, firstly, the treated gas is automatically switched to the activated carbon adsorber Ⅱ (activated carbon adsorber Ⅰ stops adsorption operation), and then the hot airflow is used to desorb and desorb the activated carbon adsorber Ⅰ to desorb the organic matter from the activated carbon. In the desorption process, the organic waste gas has been concentrated, the concentration is tens of times higher than the original, up to 2000ppm or more, the concentrated waste gas is sent to the catalytic decomposition device, and finally it is discharged as CO2 and H2O.

(2) After completing desorption and desorption, the activated carbon adsorber Ⅰ enters the standby state, and when the activated carbon adsorber Ⅱ is close to saturation, the system automatically switches back and desorbs and desorbs the activated carbon adsorber Ⅱ at the same time, so the cycle works.

(3) When the concentration of organic waste gas reaches 2000ppm or more, the catalytic bed can be maintained in self-ignition without external heating. This solution not only saves the energy consumption greatly, but also reduces the equipment investment because the processing capacity of catalytic decomposer is only 1/10 of the original exhaust gas processing capacity. This solution is suitable for both continuous and intermittent operation.

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