Installation tuyere arrosage

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The Technology Committees of AIST are comprised of volunteer- based members dedicated to advancing the technical development, production, processing and application of iron and steel. An aluminium-containing gas-thermal coating is applied on the treated surface and annealing is carried out. Before shot blasting of the tuyere, the protruding part of the weld between the tuyere nozzle and the external cup is ground off to a remaining depth of no more than 1. The side surface of the weld is chamfered at the side of the tuyere nozzle and the external cup.

The use of the invention increases the tuyere resistance. At that the face surface of the injector has openings located along the circumference around at least one nozzle, moreover the indicated at least one gas jet has a supersonic speed when it is formed at the output from the face surface of the injector and remains supersonic on a distance coming to at least 20d, where d- the diameter of the output opening of the indicated at least one nozzle.

Feeding of fuel from the first group of openings located along the circumference and feeding of an oxidizing agent from the second group of openings located along the circumference. Incineration of fuel and the oxidizing agent fed from the first and the second groups of openings located along the mentioned circumference for formation of a flame shell around at least one gas jet.

A great number of gas jets are fed from the injector. The fuel and the oxidizing agents are fed from the first group of openings and from the second group of openings correspondingly alternate with each other on the circumference along which they are located. At least one gas jet, the fuel and the oxidizing agent are fed from the injector directly into the space for injection without passing the zone of recycling formed with the extender of the injector.

At least one gas jet passes at a prescribed distance coming at least to 20d, where d- is the diameter of the output opening of the nozzle from which exits a gas jet keeping the diameter of the mentioned gas jet in essence constant. EFFECT: the invention allows make an arrangement with the aid of which it is possible to form effective cumulative gas jets without need in an extender in the injector or in any other element for forming recycling zone for gases fed from the injector.

Distance between metal pistol and surface to be coated is mm. SUBSTANCE: method involves applying aluminum-containing coating onto outer surface of flange-free tuyere using metallizing gun movable at constant velocity from one edge to another edge relative to tuyere rotating at constant angular velocity, with rotational velocity of tuyere and velocity of metallizing gun being selected so as to provide thickness of coating below 0.

Total surface area of cross sections of cooling ducts consists of 0. Spacing from inner surface of cooling duct till outer surface of nozzle part of tuyere consists of 0. Spacing between inner surfaces of adjacent cooling ducts along axis of tuyere consists of 0.

FIELD: metallurgy industry; the devices for purging of the liquid melt by the gaseous oxidizing agent. SUBSTANCE: the invention is pertaining to the field of metallurgy, in particular, to the devices of the liquid melt purging by the gaseous oxidizing agent. The tuyere contains: the body; the connection pipe with the outlet opening; the punch and the stopper made as the single component; the channel of the gaseous fuel feeding; the channel of the oxidative gas feeding; the channel of the water delivery, which has been made in the connection pipe; the drives block with the power and control drives.

At that the coupling rod of the power drive, which is coaxial to the connection pipe outlet, rigidly coupled to the indicated the single component and is the spring-loaded; the hammer mounted in the drives block is kinematically coupled to the control drive and interacting with two ring abuts.

The usage of the invention ensures the increased efficiency. FIELD: metallurgy; blast furnace process; melting cast iron or ferroalloys at blast of fuel additives mazut, natural gas. Gas supply pipe passes through inner cavity between outer and inner sleeves of tuyere. One of bases of truncated cone is located at distance of 0. Diameter of other base of truncated cone corresponds to diameter of inner sleeve. EFFECT: enhanced mixing of gas with blast; improved conditions of reaction of combustion of natural gas.

Three-layer protective coating is applied onto outer working surface. Such coating is deposited by means of plasma spraying of material; it includes first and second metallic layers and also third layer containing zirconium dioxide. Protective coating is applied onto the whole outer copper surface and onto end portion of inner surface at side of its mouth part.

First layer of protective coating is made of molybdenum, second layer is made of nickel base refractory alloy and third layer is made of aluminum compounds and zirconium dioxide.

Each layer of protective coating has thickness 0. Wire is used as material for applying each layer of coating. SUBSTANCE: proposed feeder has two hoppers with materials charging devices and aeration chambers, materials injection chamber with shutoff-and-control device connected with aeration chambers of hoppers. Aeration chambers of hoppers are connected with injection chamber through side charging holes, diameter of each charging hole is 0.

EFFECT: improved stability of regulated delivery of homogeneous mixture of powders or dust into pneumatic transportation line. SUBSTANCE: method includes cleaning covered surface by metallic shot, gas-thermal applying of aluminum-containing cover on it and following thermal processing, cover is applied on surfaces of inner glass and front portion, forming blow channel, until their welding together.