Research on Reduction Rate of CO and Smoke Criterion Emission in Road Tunnel Ventilation

Abstract

It is known that calculating the required amount of air is the rationale of the whole design of road tunnel ventilation and defining the reduction rate of CO and smoke criterion emission also generates a great effect on the long-term required amount of air. In terms of this, through listing and analyzing the components of vehicle pollutant discharge, emission standards of pollutants from cars in the European Union (EU), and discharge standards prescribed by PIARC, it is apparent that the emission standards of vehicle pollutants in China should follow that of the EU and should be divided into 4 stages. By analyzing the annual reduction coefficient values and the criterion emission reduction of CO and smoke, with consideration of the legal provisions in China for strict limitation of CO and smoke emission from vehicles, development of automotive technology and domestic and overseas environmental requirements, it is suggested that at present the 1-2% reduction rate set according to China's Specifications for Design of Ventilation and Lighting of Highway Tunnels is conservative. Therefore, a synthetic analysis should be made in actual tunnel ventilation design and confining the required amount of air within a rational scope to ascertain the tunnel operation safety.