Modeling the distribution of components emitted from oiled scale between water, gas, and dust media in blast furnace dedusting plant

Distribution of oil from oiled scale between various types of waste from blast furnace dedusting plant: dust, sludge, and slime water was estimated by physical modeling using a vertical tubular electric furnace. According to the mathematical modeling of thermal state of a metal container with oiled scale, intensive evaporation of oil in a blast furnace begins after it is loaded and lowered along the shaft to a depth approximately corres­ponding to three feeds. The oil was passed through a layer of sinter and pellets of the Mikhailovsky GOK heated to 500 °C with a mass of 0.6 kg and a particle size of 10 – 12 mm. Together with oil vapors, finely ground material was injected into the layer of iron ore raw materials (IORM), which imitated in component and fractional composition a mixture of blast furnace dust and sludge from a vacuum filtration plant (VFC) of blast furnace shop, taken in a ratio of 36:64. The physical modeling ensured compliance with the actual gas-dynamic mode in the area of blast furnace ore ridge, based on equality of the Reynolds criterion. The value of this criterion, equal to 215, was achieved in the laboratory model when argon was supplied with a flow rate of 70 L/min. According to the experimental results, distribution of oil was, % of the initial amount: 74.8 % decomposed on the IORM layer corresponding to three feeds; 9.1 % turned into blast furnace dust; 15.9 % turned into VFC sludge; there was no oil in the wet gas purification water; 0.2 % (30 mg) of the oil underwent wet dedusting in the form of an aerosol; a small amount of soot was observed on the pipeline walls. Gas phase of oil decomposition contained: 70 – 90 % H 2 ; 1.5 % CO; 0.5 – 7.0 % CO 2 ; 3.2 – 22.2 % CH 4 ; 0.1 – 2.5 % Σ(C 2 H 4 , C 2 H 6 , C 3 H 6 , C 3 H 8 ). The content of benzo(a)pyrene controlled in Russia in oil vapor did not exceed 0.00058 %.