Fan setting method for road tunnel multi-silo system

A technology for road tunnels and shafts, which is applied in mine/tunnel ventilation, mining equipment, earthwork drilling and mining, etc.

Inactive Publication Date: 2009-05-13
ZHEJIANG PROVINCIAL INST OF COMM PLANNING DESIGN & RES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0097] The invention solves the problem of measurement and calculation of longitudinal ventilation arranged in any shaft, and integrates the ventilation calculations of three commonly used ventilation methods: full-jet fan longitudinal ventilation, shaft supply and discharge type longitudinal ventilation, and shaft and jet fan combined longitudinal ventilation.

Method used

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  • Fan setting method for road tunnel multi-silo system
  • Fan setting method for road tunnel multi-silo system
  • Fan setting method for road tunnel multi-silo system

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Embodiment 1

[0172] The method of the present invention has the following basic assumptions in the ventilation calculation process:

[0173] Incompressibility: There are three reasons for the compressibility of the air flow in the tunnel ventilation system, namely ① the change of the static pressure of the air flow caused by the fan, ② the change of the air flow velocity, and ③ the change of the shaft depth. The static pressure and dynamic pressure caused by the above reasons have very little influence on the wind flow compressibility, and will not significantly affect the accuracy of the calculation results in the ventilation calculation, so the air in the tunnel can be assumed to be an incompressible fluid. However, it is still necessary to consider the compressibility of wind flow and the thermal change process when analyzing natural ventilation which is greatly affected by air gravity.

[0174] Constant flow: The mechanical wind, traffic wind, and natural wind pressure and flow velocit...

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Abstract

The invention discloses a method for arranging fans in a multi-vertical shaft system of a highway tunnel. The method mainly comprises the following steps: searching forward to find a mark for a vertical shaft with air supply volume to be determined to establish segmental calculations for the following calculation of the initial value Qbi<0> of the air supply volume of the current (vertical shaft), gradually increasing air supply volume Qbi, calculating and detecting air concentration ratios Ci at bottoms of all vertical shafts till all of the air concentration ratios Ci are less than or equal to 1 and calculating all designed air volumes Qri and air speed vri for establishment of segmental calculations; and calculating the air concentration ratios Ci at bottoms of all vertical shafts and detecting if the air concentration ratios are less than or equal to 1 to realize circulation control of established segmental calculations. The forward segmental searching calculation is extremely effective for multiple segmental ventilation combination of exhaust gas discharge and fresh air supply. The solution of the calculation is a safe and economic solution under given conditions and can be used for arranging fans conveniently.

Description

technical field [0001] The present invention relates to the field of ventilation system design for highway or road tunnel operation, in particular to an exhaust axial flow fan, air supply axial flow fan and jet flow fan in a highway or road tunnel operation longitudinal ventilation system using automobiles as means of transportation The setting method and the verification method of configuration rationality. Background technique [0002] There are two types of ventilation in highway tunnels: natural ventilation and mechanical ventilation. If the tunnel is short, the exhaust gas can be discharged by the traffic piston wind, and natural ventilation can be used. Usually, the length of the two-way traffic tunnel (m)×design traffic volume (vehicle / h)<6×10 5 , and the length of one-way traffic tunnel (m)×design traffic volume (vehicle / h)<2×10 6 In some cases, natural ventilation can be used, and mechanical ventilation should be used in other cases. Mechanical ventilation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F1/00E21F1/08
Inventor 项小强吴德兴李伟平郑国平
Owner ZHEJIANG PROVINCIAL INST OF COMM PLANNING DESIGN & RES CO LTD
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