Determination method for critical effective air quantity of deduster of enclosed ventilation system of road tunnel

Abstract

The invention discloses a determination method for the critical effective air quantity of a deduster of an enclosed ventilation system of a road tunnel. The method comprises the following steps that 1) a critical effective air quantity coefficient of the deduster is determined; 2) on the premise that the ventilation design requirement is met and delta2=delta, the critical flue dust concentration of upstream ventilating current is calculated; 3) according to a mass conservation principle in physics, the air quantity of unpurified cycled ventilating current flowing into the deduster is calculated; and 4) a formula for the effective critical value of the quantity of air flowing into the deduster is obtained according to formulas in the steps 1), 2) and 3), and according to the effective air quantity critical value formula, when the effective air quantity of the deduster is equivalent to or greater than the critical value, the parallel ventilating current flue dust concentration in the short tunnel exceeds the allowed concentration, and vehicles in the short tunnel are not safe. The method can be used to determine the critical value of the effective air quantity of the deduster of theenclosed ventilating system of the ultra-long road tunnel, calculation is simple, and driving safety of the vehicles in the short tunnel can be ensured.

Description

Technical field [0001] The invention belongs to the technical field of tunnel disaster prevention and mitigation, and specifically relates to a method for judging the critical effective air volume of a dust collector of a closed ventilation system of a highway tunnel. Background technique [0002] Highway tunnels are narrow and long spaces that are semi-sinked or shallowly buried. The treatment of pollutants such as smoke and dust generated by cars driving in the tunnel has always been an important issue of concern to the industry. Generally, mechanical ventilation is used to dilute smoke and CO and other pollutants, and the waste air is discharged to the environment outside the tunnel, and it is a direct-flow system scheme. The ventilation system of long-distance or extra-long-distance highway tunnels must cooperate with ventilation shafts to meet the air demand for diluting pollutants in the tunnel. The ventilation of extra-long highway tunnels specifically involves the optimi...

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Problems solved by technology

However, the high cost of ventilation for extra-long tunnels and the location of shaft excavation are restricted by geology and urban planning are still prominent, and the method for determining the critical effective air volume of dust collectors for closed-type controllable circulation ventilation of extra-long highway tunnels has not yet been formed.

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