METHOD OF PURIFICATION OF A BLAST-FURNACE GAS AT INCREASED PRESSURE OF THE GAS ON A BLAST FURNACE TOP Russian patent published in 2004 - IPC

FIELD: iron and steel industry.

SUBSTANCE: the invention is dealt with the field of iron and steel industry, in particular with the blast-furnace production. The method of purification includes: a preliminary dry purification of gas in the axial cyclone separator, semi-fine purification and a preliminary cooling of a gas in a scrubber or in a scrubber section, the fine gas purification in the regulated Venturi pipes with a ring type clearance at a pressure fall up to 25 kPa and separation of the condensed moisture in the drop catcher. After the drop catcher the pure gas is passed through a drosselling group of dry type, and the temperature of the pure gas before its passing through a drosselling group is kept (depending on the gas pressure at blast-furnace top ),within the limits of 45-60°С, calculating it by a well-known dependence of the steam share in a saturated gas against its temperature and by the formula: f₁=f₂ (P₁/P₂) g / m³, (1) where: f₁ is a share of steam in the gas before the drosselling group of dry type, g / m³; f ₂ is a share of steam in the gas after passing the drosselling group of dry type, g / m³; P₁- an absolute pressure of gas before passing the drosselling group, MPa;_{P2- absolute pressure of gas after passing the drosselling group, MPa. The invention allows to decrease a specific consumption of materials and power consumption used for purification and cooling of a top gas.}

EFFECT: decreased specific consumption of materials and power consumption used for purification and cooling of a top gas.

1 dwg, 3 ex