Abstract:
Powdered particles are continuously distributed from a pressurized transporting vessel to a plurality of receiving ends such as tuyers of a blast furnace through a plurality of transporting pipes for each receiving end. A speed of gas supplied to the vessel is controlled depending on a weight changing ratio of the vessel and an internal pressure of the vessel, so that the speed of gas is maintained at constant. Booster gas is supplied to each of the transporting pipes. A discharging rate of the powdered particles is controlled for each of the pipes by Individually controlling a flow rate of booster gas is cascade-controlled depending on a differential pressure in each discharge nozzle of the pipes, or on an output of solid-gas mass-flow meter in each of the pipes, or on a solid-gas ratio corresponding to each length of the pipes and a mass-flow rate of the particles in the vessel per total gas flow rate.
Abstract:
L'invention s'applique plus particulièrement à un sas à rotor alvéolaire, dans lequel on évite les fuites de matière pulvérulente le long l'axe en injectant un gaz de rinçage sous pression dans le palier de l'axe. Pour assurer une action efficace avec le minimum possible de contrepression du gaz, on règle le débit et la pression du gaz de rinçage de manière que son débit, ainsi que la différence entre la pression du gaz de rinçage et celle du gaz de propulsion soit constante et, au niveau de l'injection du gaz de rinçage, on divise progressivement le flux de ce gaz pour le distribuer uniformément autour de l'axe.
Abstract:
A high-speed jet of liquid oxygen (21) with a speed higher than 100 meters per second is delivered into the tuyeres of a blast furnace or cupola furnace together with pulverised carbon. The jet reaches the opposite wall of the cavity (9) formet at the outlet of the tuyere (6) in the mass of material contained in the shaft. Supplying oxygen to the bottom of the cavity improves the burning of the remaining coal, whereby higher injection levels may be achieved. The shape of the cavity may also be altered, and, in particular, faster reactions may be achieved in the axial region of the shaft.
Abstract:
In order to avoid burn-back in a coal-dust blowing lance which projects into the hot-blast main of a blast furnace, the lance is cooled with a coolant aerosol. Water is the preferred coolant. Either the oxygen blown in through the lance to ensure complete combustion of the coal dust or air is used as the carrier gas for the water aerosol.
Abstract:
A method using a liquid catalytic material sprayed onto a solid fuel injected into a blast furnace. The main function of the method is to alter the combustion of the fuels in the blast furnace to improve the heat balance and the quality of the blast furnace gases.
Abstract:
The invention concerns a process and device for injecting in particular coal dust by a dense-flow method using oxygen in/through a blowing mould in a blast furnace by means of at least one lance projecting into the mould. The coal dust is mixed together with the oxygen in the immediate vicinity of the mouth (7) of the lance, and the exit speeds of the coal dust and the oxygen can preferably be altered over wide ranges. The lance (1) used preferably has a coal-conveying inner tube and an outer tube which surrounds the inner tube concentrically to form an annular gap (3), the oxygen being fed in through this annular gap (3).
Abstract:
The purpose of the invention is to reduce the relatively high carbon content in the traditional blast furnace by suitable means in such a way that steel melts meeting the EUROSTANDARDS are produced. Structurally, the suitable means are the provisions of a free pan or crucible-like handling area in the region of the boshes, a coking plant using coal or lignite at about the middle of the furnace and an inclined blow mould plane with blow smelting. The handling area is intended for direct iron reduction without the generation of undesired iron carbide and for the use of a refining process at the edge of the frame or through and adjacent reaction chamber. The arrangement of the coking plant inside the furnace is such that the brightly glowing coke and the highly heated reduction material meet in the handling area, resulting in shock reduction with a short reaction time in the blow mould plane without the undersired formation of iron carbide.
Abstract:
A method of ironmaking by means a smelting shaft furnace including the steps of supplying iron ore and coke to the top of the furnace; and injecting coal and oxygen into the smelting zone of the furnace to promote combustion, to control reaction temperature and provide heat for smelting, the quantities of coal and oxygen injections being within the range of 0.7 to 1.7 of stochiometric conditions with respect to combustion to carbon monoxide and hydrogen.
Abstract:
Overheated reducing gases are injected into the blast-furnace, at the main blast-pipes, at a temperature ranging from 1500 to 2800`C, produced from solid fuel, said gases containing essentially CO, H u, N u, CO u and H uO. These reducing gases are obtained from a solid fuel, preferably dried and finely ground, injected in adequate proportions (O/carbon ratio) in a reactor where it is gasified by contact with an oxidizing agent such as air, over oxygenated wind or recycled top gases having a sufficient CO u content. These reducing gases are preferably overheated by electric process, particularly in a plasma torch.
Abstract:
The proposal is for a device and a process for feeding coal dust into a shaft furnace in which coal dust is fed into the shaft furnace by means of a carrier gas through a feed line (20). The coal dust is heated, before entering the feed line (20), preferably in several stages in a plurality of containers (4, 10, 14) one behind another in which there are heating elements (28, 42, 44).