Abstract
Building an independent gas compartment in utility tunnel will require spending additional costs for construction, which is often hindered by the public budget limitations. To lay gas pipelines together with water pipelines compartment in utility tunnel was proposed, forming a water-gas compartment. Persistent ventilation consumes too much energy to cope with small possibility accident. Hence, the diffusion law of potential gas leakage and effect of the present combustible gas detection, alarming and ventilation systems were examined by a numerical simulation using the software Fluent based on computational fluid dynamics (CFD). The volume fraction of leaking methane accumulation law without ventilation were obtained. The results revealed that the present emergency measures for a single gas pipe compartment can be safely applied to the proposed water-gas compartment to guarantee the safety, which provides novel insights into and an important basis for the improvement of the related urban engineering design and relevant standards. Optimization scheme of ventilation was proposed and energy saved was calculated quantitatively.
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