T/SMHTA 004-2023 Method for Detecting Asphalt Gas Emissions

Scope

Main technical content: The volatile gases emitted during the production and construction of asphalt mixtures mainly come from the gases volatilized during the heating process of asphalt, including various gaseous pollutants such as nitrogen oxides (NOX), sulfur dioxide (SO2), hydrogen sulfide (H2S), volatile organic compounds (VOCs), and other volatile gases. At present, the collection of asphalt volatile gas emissions mainly includes two methods: on-site collection and gas bag collection. On-site collection is mainly used for real-time online detection, but it is affected by some uncontrollable factors such as climate changes. During the collection and detection process, the gas temperature cannot be accurately controlled, which cannot meet the needs of converting the detection values of different detection instruments, and it cannot ensure that the average concentration value calculated from the real-time process curve of online detection and the concentration value detected by offline gas bag collection (i.e., the average concentration value) are within an acceptable range of detection error. The purpose of this document is to provide a method for evaluating the average concentration value and concentration process curve of asphalt volatile gases. It can control the temperature and flow rate of the detected gas, and can connect the gas bag to collect the gas for offline detection or directly connect the detection instrument for real-time detection. Moreover, the average concentration values obtained by direct detection and offline detection can be verified within a certain error range. In the context of China's vigorous promotion of environmental protection and green low-emission, establishing an accurate and controllable method for detecting asphalt gas emissions is of great significance for promoting the popularization and application of asphalt emission reduction technologies.

Development Information

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