Bidirectional reversible ventilation smoke exhaust system for extra-long highway tunnel

Abstract

The invention discloses a bidirectional reversible ventilation smoke exhaust system for an extra-long highway tunnel. The bidirectional reversible ventilation smoke exhaust system comprises a main driving part, a mountain body air duct part, a mountain top fan room part, a mountain top wind tower part and a tunnel harmful gas monitoring system, wherein the mountain body air duct part is arranged in a mountain body, the main driving part is arranged at the position, on the lower side of the mountain body air duct part, in the mountain body, the mountain top fan room part is arranged at the topof the mountain body, the mountain top wind tower part is arranged at one side of the mountain top fan room part, the top of the mountain top wind tower part is provided with an air and smoke exhaustshaft, the top of the air and smoke exhaust shaft is provided with a wind tower wind cap, and the tunnel harmful gas monitoring system comprises a monitoring terminal, a concentrator and a monitoringterminal. According to the bidirectional reversible ventilation smoke exhaust system, an air supply duct and a smoke and air exhaust air duct of an air supply and exhaust type ventilation system are combined into a common main air shaft, so that the number of installed fans is reduced, fan equipment is not idle, the equipment maintenance cost is reduced, and the fault rate of the fan equipment isreduced.

Description

technical field [0001] The invention relates to the technical field of tunnel ventilation, in particular to a two-way reversible ventilation and smoke exhaust system for extra-long highway tunnels. Background technique [0002] According to the length of highway tunnel construction, the tunnel types are divided into short tunnels (L≤500m), medium-long tunnels (500m<L≤1000m), long tunnels (1000m<L≤3000m) and extra-long tunnels (L>3000m). For extra-long tunnels with a length of L > 5000 meters, the air supply and discharge type longitudinal ventilation is usually adopted, and the polluted air in the tunnel is discharged through the exhaust shaft, and fresh air is sent into the tunnel through the air supply shaft to dilute the pollution of the polluted air in the tunnel. concentration, so as to discharge polluted air and send fresh air into the tunnel at the same time to meet the requirements of ventilation and smoke exhaust for tunnel operation. [0003] For tunne...

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Problems solved by technology

[0005] 1. The supply and exhaust ventilation system needs to divide the main ventilation shaft into civil structure, which is divided into air supply shaft and exhaust shaft, which will increase the amount of civil engineering and investment costs of civil engineering.

[0006] 2. The flow cross-sectional area of ​​the divided air supply air duct and exhaust air duct is much smaller than the flow area of ​​the main air shaft. When the exhaust air volume and supply air volume are constant, the greater the flow resistance of the ventilation system, the greater the power consumption. The bigger it is, the higher the cost of the ventilation system;

[0007] 3. The air supply and exhaust type longitudinal ventilation system needs to set the air supply fan and the exhaust fan separately, and each type of fan needs to be reserved for a long-term reserve. The number of fan equipment is too large, which increases the initial investment of equipment, and the equipment installation space is large. , increasing civil construction costs

[0008] 4. Since the installed power of the air supply fan and axial flow fan is too large (more than 400KW in most cases), the operating cost of the equipment is high, so the operating unit will reduce the number of fans turned on and the running time of the fans, resulting in a decrease in the utilization rate of the fans or even being idle. The fan equipment cannot be maintained in time, and the fan that has been idle for a long time will increase the failure rate or even be damaged, which will lead to an increase in equipment maintenance costs. In severe cases, it is even necessary to purchase new fan equipment

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