| Faced with the difficult problem that hazardous chemicals road transport leakage accidents often cannot be handled quickly and efficiently,a water-safety barrier device capable of spraying water curtains is designed.Utilizing the convenience of water-safety barrier device and the air entrainment,momentum transfer,and heat transfer effects of the water curtain,the leakage gas cloud can be screened and diluted in time after the leakage accident to prevent the accident from expanding and reduce the accident loss.In this paper,the water-safety barrier device capable of spraying water curtain is taken as the research object.The device is studied through design,numerical simulation,and case analysis.The main contents include the device’s structural design,parameter design,performance research,and application effect research.The specific research content is as follows.(1)The design of water-safety barrier device capable of spraying water curtain.The design basis and requirements of the water-safety barrier device are introduced.The composition structure and main components of the device are analyzed,the working principle of the watersafety barrier device is explained,and the basic parameters of the water horse device are determined.(2)Parameter optimization.By comparing and analyzing the numerical simulation results with the Rana experimental results,the average relative error is less than 3%,which verifies that the reliability of the numerical model is good.The computational fluid dynamics model was used to study the gas cloud diffusion characteristics under the conditions of fan-shaped water curtain and conical water curtain,and the influence of different water supply pressure and nozzle installation angle on the dilution performance of water curtain was analyzed.Studies have shown that: the water curtain can effectively block the diffusion of gas clouds;under the same water supply pressure,the fan-shaped water curtain has a better dilution effect than the conical water curtain;the dilution efficiency increases with the increase of the water supply pressure,and it is reasonable to set the water supply pressure at 0.3MPa;as the nozzle installation angle increases,the dilution effect of water curtain decreases.(3)Analysis of influencing factors of water-safety barrier device blocking gas cloud diffusion.UDF programming was used to optimize the wind speed inlet boundary,and the influence factors such as environmental wind speed,distance from device to leak source,and water-safety barrier arrangement on water curtain suppression effects were studied.The results show that the greater the wind speed,the worse the water curtain’s dilution performance.The closer the water-safety barrier is to the source of leakage,the better the blocking and dilution effect of the water curtain,and the better the suppression of the downwind and crosswind directions.The dilution effect of the double-drainage is better than that of the single-drainage,and the smaller distance of the double-drainage is better than the larger distance.(4)Applied Research.Combined with a methanol road transport leakage accident,the actual application effect of water-safety barrier was verified.The results show that the watersafety barrier can effectively reduce the diffusion distance of gas clouds in the downwind and crosswind directions and the danger area of the toxic gas.The affected area of ERPG-1,ERPG-2,and ERPG-3 have a maximum reduction of more than 70%. |
