Method of calculating reduction factor of fresh air quantity of air supply vertical shaft for tunnel opened circulatory ventilation

A technology of circulating ventilation and reduction factor, which is used in mine/tunnel ventilation, calculation, and earth-moving drilling, etc., can solve the problem that the calculation method of the reduction factor of fresh air volume has not yet been formed and the ventilation cost is high.

Active Publication Date: 2018-12-11
HUNAN UNIV OF SCI & TECH
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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 calculation m

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  • Method of calculating reduction factor of fresh air quantity of air supply vertical shaft for tunnel opened circulatory ventilation
  • Method of calculating reduction factor of fresh air quantity of air supply vertical shaft for tunnel opened circulatory ventilation
  • Method of calculating reduction factor of fresh air quantity of air supply vertical shaft for tunnel opened circulatory ventilation

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Embodiment Construction

[0062] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0063] see figure 1 , figure 2 The open-type controllable circulating ventilation system of the extra-long highway tunnel includes a circulating air duct 5 arranged in the bypass tunnel of the tunnel and parallel to the tunnel. Between the tunnel entrance 1 and the induced air section B of the circulating air duct 5 is the upstream tunnel 2, and the circulating air Between the ejection section E of the road 5 and the tunnel exit 9 is the downstream tunnel 8, the circulating air duct 5 communicates with the tunnel through the air induction section B and the ejection section E at both ends of the tunnel, and the tunnel between the upstream tunnel 2 and the downstream tunnel 8 is a tunnel Short road 14; Dust collector is arranged in circulating air duct 5, 11 is dust collector outlet, 12 is dust collector inlet; The entrance is connected, and ...

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Abstract

The invention discloses a method of calculating a reduction factor of fresh air quantity of an air supply vertical shaft for tunnel opened circulatory ventilation. The method mainly includes: an equivalent fresh air quantity calculation formula for a circulatory flow that flows through a dust remover and is purified; in a controllable circulatory ventilating system, allowing quantity of fresh airinto the air supply vertical shaft to be equal to quantity of discharged polluted air from a discharge vertical shaft, and determining a calculation formula for equivalent quantity of fresh air sent by the air supply vertical shaft; in the controllable circulatory ventilating system, determining a calculation formula for equivalent quantity of fresh air discharged by the discharge vertical shaft;applying the three formulas above in the controllable circulatory ventilating system according to the conservation principle of physics so as to obtain a calculation formula of equivalent quantity offresh air for an ejector segment of a circulatory air duct; acquiring, from the calculation formula, a calculation formula for a reduction factor of fresh air quantity of the air supply vertical shaftin the controllable circulatory ventilating system. When the reduction factor of the fresh air quantity of the air supply vertical shaft in the open controllable circulatory ventilating system is less than 1, the controllable circulatory ventilating system can be executed to reduce actual air supply-discharge quantity.

Description

technical field [0001] The invention belongs to the technical field of tunnel disaster prevention and mitigation, and in particular relates to a method for calculating the fresh air volume reduction coefficient of an air supply shaft for open controllable circulation ventilation of an extra-long highway tunnel. Background technique [0002] Highway tunnels are long and narrow spaces that are semi-submerged or shallowly buried. The treatment of pollutants such as smoke and dust generated by cars driving in tunnels has always been an important issue of concern to the industry. Generally, mechanical ventilation is used to dilute pollutants such as smoke and CO, and the dirty air is discharged to the environment outside the tunnel, and it belongs to the direct current system scheme. The ventilation system of long-distance or extra-long-distance road tunnels must cooperate with ventilation shafts to meet the wind demand for diluting pollutants in the tunnel. The ventilation of e...

Claims

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Application Information

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IPC IPC(8): E21F1/00E21F1/08E21F5/20E21F17/18E21F17/00G06Q50/02
Inventor 陈世强武梦婷王海桥田峰郝小礼李石林陈永平吴世先
Owner HUNAN UNIV OF SCI & TECH
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