A Multi-parameter Tunnel Ventilation Control Method Based on Emission Rate and Concentration

Abstract

The invention discloses a multi-parameter tunnel ventilation control method based on the discharge rate and the concentration. A plurality of jet fans are sequentially arranged in a tunnel in a scattering manner from front to back, a plurality of ventilation shafts are arranged section by section, and an exhaust fan is arranged on each ventilation shaft; the control method of the jet fans comprises the following steps: a controller is adopted to control the starting or the stopping of the jet fans according to the concentration detection value, the corresponding set value and the corresponding control domain; the control method of the ventilation shafts comprises the following steps: the controller controls the starting or stopping of the exhaust fans according to the concentration detection value, the wind speed detection value, the calculated value QNox of the nitrogen oxide discharge rate, the respective set values and the respective control domains theta. The starting or stopping sequence of the jet fans and the concentrated exhaust fans is controlled according to the smokescope (CVI) and the CO concentration (CCO), the quantitative control is achieved, and energy waste, which is caused by the fact that the concentrated exhaust fans and blowers are started for a long time, can be avoided.

Description

technical field [0001] The invention belongs to the technical field of tunnel ventilation, in particular to a multi-parameter tunnel ventilation control method based on discharge rate and concentration. Background technique [0002] Due to the advantages of not destroying the ground landscape, not splitting the city center, and being able to reduce the impact of motor vehicle exhaust emissions on the surrounding environment, urban road tunnels have been more and more used in cities. [0003] To ensure the safe operation of the tunnel, effective ventilation is essential. Tunnel ventilation includes natural ventilation and mechanical ventilation. Mechanical ventilation includes full horizontal ventilation, semi-horizontal ventilation, longitudinal ventilation and combined ventilation. From the perspective of international development trends, the opening of tunnels has generally developed from a single-hole two-way to a double-hole one-way opening, that is, the tunnel is divid...

AI Technical Summary

Problems solved by technology

In the Integrated Emission Standard of Air Pollutants, NO x Stricter limits have been put forward for the emission rate, but NOx is generally not installed in the control system of urban tunnels at present. x Concentration sensors, which resulted in no substantive safeguard measures for NO x to control the emission rate of

[0007] Second, when the ventilation shaft adopts mechanical ventilation, there is no scientific quantitative basis for when the axial flow fans for centralized air supply and exhaust will be put into operation, which will cause energy waste to a certain extent

Since the control parameters of the current tunnel ventilation system are usually only smoke concentration (VI) and CO concentration, in actual operation, it is impossible to x The emission rate of the central ventilation system determines the operating conditions under which the centralized ventilation system should be put into operation. There is a certain blindness in the opening, and the power of the axial flow fan is much higher than that of the jet flow fan, which inevitably causes waste of energy.

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