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Exploration of Hygienic Standards for Operation Ventilation of a Highway Tunnel in High-Altitude Area
Abstract sers of the tunnel in high-altitude area always have altitude reaction, which causes the lower tolerance to automobile exhaust emissions. Therefore, as a hygienic standard, the allowable concentration of carbon monoxide in the tunnel also should be lower. While in relevant ventilation specifications, there is no distinction between the high-altitude area and ordinary area regarding the hygienic standards for air in the tunnel. In this paper, the altitude reaction characteristics at different altitudes were converted to the carbon hemoglobin (COHb) saturation equivalence with a standard of COHb saturation which represents the degree of carbon monoxide poisoning, and the suitable values of COHb saturation produced by automobile exhaust CO were proposed in accordance with different highway grades and different tunnel lengths, and corresponding allowable concentration of carbon monoxide was determined considering the time passing through the tunnel. Since the allowable concentration of carbon monoxide specified in current ventilation specifications is somewhat low, sometimes the derived carbon monoxide concentration limit for the tunnel at high-altitude area is higher than that at ordinary elevation, and some analysis were carried out and suggestions were presented for this phenomenon.
Abstract��
sers of the tunnel in high-altitude area always have altitude reaction, which causes the lower tolerance to automobile exhaust emissions. Therefore, as a hygienic standard, the allowable concentration of carbon monoxide in the tunnel also should be lower. While in relevant ventilation specifications, there is no distinction between the high-altitude area and ordinary area regarding the hygienic standards for air in the tunnel. In this paper, the altitude reaction characteristics at different altitudes were converted to the carbon hemoglobin (COHb) saturation equivalence with a standard of COHb saturation which represents the degree of carbon monoxide poisoning, and the suitable values of COHb saturation produced by automobile exhaust CO were proposed in accordance with different highway grades and different tunnel lengths, and corresponding allowable concentration of carbon monoxide was determined considering the time passing through the tunnel. Since the allowable concentration of carbon monoxide specified in current ventilation specifications is somewhat low, sometimes the derived carbon monoxide concentration limit for the tunnel at high-altitude area is higher than that at ordinary elevation, and some analysis were carried out and suggestions were presented for this phenomenon.
ZHANG Ting-Biao,
Zhang-Zhi-Dao
.Exploration of Hygienic Standards for Operation Ventilation of a Highway Tunnel in High-Altitude Area
[J] MODERN TUNNELLING TECHNOLOGY, 2014,V51(3): 23-29
2014, Vol. 51 