Intelligent control ventilation system for tunnel construction

Abstract

The invention belongs to the technical field of tunnel construction ventilation, and particularly relates to an intelligent control ventilation system for tunnel construction, which comprises a monitoring substation 1, a monitoring substation 2 and a hard air pipe, and a fan body comprises a monitor, a control room, an APP and a large monitoring screen. The monitoring substation 1 and the monitoring substation 2 measure environmental parameters, atmosphere temperature and humidity, atmospheric pressure and the like, outlet flow is measured through a pitot tube, a fan body is provided with a horn-shaped inlet current collector to accurately measure the inlet flow of the fan, measured data are transmitted to a control room through an optical fiber, and a control system controls the outlet flow and the environmental parameters and controls the fan body through the optical fiber. The rotating speed of the fan is adjusted through the frequency converter. On the basis of meeting energy-saving ventilation of the tunnel, the system can also display the hectometer air leakage rate of the air pipe, the operation efficiency of the fan and stall allowance alarm in real time, and can also remotely control the whole system, call out data and the like.

Description

[0001] A Intelligent control ventilation system for tunnel construction technical field [0002] The invention belongs to the technical field of tunnel construction ventilation, in particular to an intelligent control ventilation system for tunnel construction. Background technique [0003] The ventilation mode of tunnel construction is divided into natural ventilation and mechanical ventilation according to the source of power. The natural ventilation mode is to use the wind pressure difference inside and outside the tunnel to drive ventilation, completely relying on natural ventilation, without additional energy consumption, and has high economic However, it is subject to many constraints, such as the temperature difference inside and outside the tunnel, auxiliary tunnel setting factors, and terrain conditions. The mechanical ventilation method is a kind of forced ventilation using tunnel fans. The basic methods mainly include air supply, exhaust, mixed and tunnel type. Th...

AI Technical Summary

Problems solved by technology

This method relies on manual work, often has hysteresis and poor timeliness in operation, and cannot accurately adjust the operating speed. The actual operating air volume is also based on subjective guesses, and the energy cannot be fully utilized.

[0006] Secondly, as the length of the air duct increases, the air leakage cannot be simply calculated according to the air leakage rate per 100 meters of the air duct, that is, Q 泄露 =Q 输出 *L*β, where Q 泄露 : air duct leakage; Q 输出 : is the air supply volume at the outlet of the fan; L: the length of the air duct; β is the air leakage rate of the air duct per 100 meters

During the tunnel construction process, the location of the air duct will be affected by construction tools, such as maintenance trolleys, second-lining benches, etc., which will cause distortion or holes in the air duct. Secondly, passing vehicles and blasting construction will also affect air duct damage

In the existing construction technology, inspectors usually use the naked eye and hearing to judge the quality of the air duct, and carry out leak detection and maintenance work. However, the tunnels range from a few kilometers to 10 to 20 kilometers, and the inspectors need to walk back and forth. Leaks were found, but the complex environment and noise in the tunnel brought huge challenges to the work of leak detection and filling, and the impact of air duct leakage could not be completely avoided

[0007] The flow rate and total pressure of the tunnel fan during operation cannot be displayed. The actual required air volume and the air volume reaching the outlet of the air duct can only be judged based on experience, which brings troubles to the operators. Most of the cases are operated at high speeds. With the deepening of the tunnel, the operating conditions of the fan change. When the resistance is too large, the fan may fall into the unstable operation area (stall area), which will affect the safety of the fan.

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