| Evacuation system in natural gas station plays an important part for all the time.However,because of the greater diameter of newly build pipe,higher operation pressure and more complexity of environment,the hidden danger of evacuation has gotten wide attention.Therefore,it is necessary to study the evacuation system of natural gas and clear the influence on evacuation of different factors,that has an significant meaning on safe operation of pipe.Therefore,in this paper,based on the analysis of regulations of evacuation and gas diffusion process,influence on vent and flare of different factors such as wind velocity was studied by PHAST and FLUENT software,and then safe distance was put forward in different conditions.These work has been finished by following.(1)Vent(1)Influence factors and diffusion characteristics of natural gas were analyzed.(2)Gas concentration distribution rules were determined in different factors including wind velocity,atmospheric stability,initial vent pressure and diameter of vent pipe.(3)Influence on gas concentration distribution rules of obstacle was analyzed.(4)Safe distance of flash and explosion was determined under the different conditions,and flare was suggested when evacuation velocity was over 20×10~4m~3/h.(5)Method to determining maximal vent pressure was put forward by noise level.(2)Flare(1)Thermal radiation distribution rules were determined in different factors including wind velocity,atmospheric stability,initial vent pressure and diameter of flare pipe.(2)Influence on thermal radiation distribution rules of obstacle was analyzed.(3)Method to determining flare safe range was put forward according to the examples of Siyang station and Dachandao.(4)According to the measured temperature of flare,strength range of metal was given,and it met the requirements by using CEASARII software check its stress. |
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