Tunnel ventilation and smoke exhaust system and method

Abstract

The invention provides a tunnel ventilation and smoke exhaust system and method. The system comprises at least one vertical shaft, two or more jet fans, a sensor and a controller. The vertical shafts are formed on the top of a tunnel; the jet fans are arranged in the positions, on the two sides of the vertical shafts, of the top of the tunnel correspondingly; the sensor is arranged on the inner wall of the tunnel and used for sensing the fire source position inside the tunnel; and the controller receives the fire source position signal sent by the sensor and enables the jet fans which have the nearest distance with a fire source on the two sides of the vertical shaft to blow wind oppositely. When a fire occurs in the tunnel, by means of the tunnel ventilation smoke exhaust system and method, the suck-through phenomenon can be avoided, and the ventilation and smoke exhaust efficiency of the vertical shafts is improved.

Description

technical field [0001] The invention relates to tunnel technology, in particular to a tunnel ventilation and smoke exhaust system and a tunnel ventilation and smoke exhaust method suitable for fires in tunnels. Background technique [0002] In recent years, my country's urbanization process has continued to advance, and urban land resources are in short supply. Therefore, many large cities are vigorously building subway tunnels and road tunnels. In mountainous and hilly areas, tunnels are also widely used. While these tunnels bring convenience to people, they also bring new challenges to tunnel ventilation and smoke exhaust. Due to the particularity of the narrow and long space structure of the tunnel, once a fire occurs, if the ventilation and smoke exhaust are not smooth, it will bring very serious consequences. Therefore, it is of great practical significance to study the tunnel ventilation and smoke exhaust. [0003] The shaft natural ventilation and smoke exhaust meth...

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Problems solved by technology

[0004] However, when using a shaft to exhaust smoke naturally, due to the strong chimney effect formed by the smoke in the shaft, the vertical velocity of the smoke in the tunnel is often smaller than the vertical velocity of the smoke in the shaft, so that a large amount of smoke directly below the shaft is discharged, while other The smoke in the area is still slowly flowing to the bottom of the shaft, which may cause the lower cold air to be directly sucked into the shaft, that is, the phenomenon of inhalation occurs, which directly disturbs the interface between the smoke and the air, causing more air to be sucked into the smoke. Air layer, resulting in reduced smoke extraction efficiency

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