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炼铁高炉炉顶放散阀的放散噪声,是炼铁系统最为突出的噪声源之一。据有关资料介绍,其噪声级一般在110～120db(A),甚至更高。如此强烈的噪声不仅严重污染厂区环境,而且影响职工及居民的正常工作和生活,甚至给安全生产造成威胁,成为一种突出的公害。 炼铁高炉炉顶放散噪声系喘流喷注噪声,它是来自高炉炉体内的气体在一定的温度和压力下,从高炉炉顶放散阀阀口高速喷出,与周围相对静止的空气冲击剪切,引起气体急剧的扰动。同时,高速气流冲击高炉煤气上升管及放散阀组件而使之产生强烈的机械噪声。这种噪声一部分随气流自放散阀口向外辐射,另一部分由放散阀阀座、阀壁和高炉煤气上升管管壁向外辐射,其噪声特性是中低频,宽频带,而且声级高,传递远,危害大。 有效地治理高炉炉顶放散阀放散所引起的喘流喷注噪声,对保护环境、造福人民都有着重要的意义。由
The discharge noise of blast furnace top relief valves is one of the most prominent sources of noise in ironmaking systems. According to the information introduced, the noise level is generally 110 ~ 120db (A), or even higher. Such a strong noise not only seriously pollutes the factory environment, but also affects the normal work and life of workers and residents and even threatens the safety of production, becoming a prominent public hazard. Blast furnace roof blasting noise emission system is a whistling jet noise, it is from the blast furnace gas at a certain temperature and pressure, blast furnace top discharge valve port high-speed jet, and the surrounding relatively static air impact shear Cut, causing a sharp gas disturbance. At the same time, high-speed airflow impinges on the blast furnace gas riser and bleed valve components, creating a strong mechanical noise. Part of this noise is radiated outwardly from the discharge port of the gas flow, while the other part is radiated outward by the valve seat of the discharge valve, the valve wall and the blast furnace gas rising pipe wall. The noise characteristics of the noise are medium-low frequency and wide frequency band, Transmission far, great harm. The effective control of blasting jet noise caused by the release of blast furnace top relief valve is of great significance to the protection of the environment and the benefit of the people. by