RU2020393C1 - Gas cupola for production of mineral wool - Google Patents

Abstract

FIELD: foundry. SUBSTANCE: water-cooled web is made in form of water-cooled ring adjoining the refractory lining of chamber which is moved inside overheating chamber and mounted at overlap over free section of the chamber of the tubes passed through it, thus enhancing stability of the refractory lining twice or even thrice. EFFECT: enhanced stability of refractory lining. 2 dwg

Description

 The invention relates to the field of foundry and building materials, more specifically to cupolas for melting mineral wool and slag production.

 Known gas cupola containing a shaft and an overheating chamber, separated by a water-cooled jumper located between two opposite walls of the overheating chamber [1].

 The drawbacks of the cupola are the complexity of the lining of the jumper and the insufficiently high resistance of the lining of the overheating chamber, due to exposure to hot gases and slag flowing down the lining.

 Known gas cupola containing a shaft and an overheating chamber, the jumper separating them is made in separate sections arranged in a checkerboard pattern, and the overheating chamber is made expanding downward, which allows to improve the distribution of gases in the mine and to somewhat increase the resistance of the lining of the overheating chamber by reducing the effects of flowing down slag per lining [2].

 The closest in technical essence and the achieved result to this invention is a cupola with a water-cooled jumper made in the form of pipes [3].

 The drawback of the cupola is the low resistance of the lining of the overheating chamber, especially the vault and the hearth, along which slag and metal flow. The main factor in the destruction of the lining is the impact on it of slag.

 This fact is further enhanced by the smelting of minerals with the aim of producing slag. Slag flowing down the walls of the overheating chamber actively interacts with the lining oxides and destroys it. The lining resistance is 2-3 melts, after which a major overhaul is carried out or a replaceable overheating chamber is mounted.

 The aim of the invention is to increase the service life of the refractory lining.

 In FIG. 1 shows a mineral wool gas cupola; figure 2 is a section aa in figure 1.

 The gas cupola consists of a shaft in the form of a water jacket 1, a heating chamber 2 with refractory walls expanding downward, a water-cooled bridge made of a water-cooled ring 3 and pipes 4 arranged in a row, and gas burners 5 installed in the lower part of the overheating chamber.

 The water-cooled ring 3 is made with a diameter smaller than the diameter of the overheating chamber in the upper part, i.e. extended into the overheating chamber and installed with an inlet on the free section of the chamber, partially overlaps it and adjoins its inner walls. Water is introduced into the ring through pipe 6, water is drawn out through pipe 7. Pipes 4 are passed through ring 3 and have their own independent water inlet and outlet. The camera is equipped with a spray device 8 to obtain slag.

 Gas cupola works as follows.

Before melting, water is supplied to the water jacket 1, water is supplied to the ring 3 and pipes 4, then the gas burners are turned on and the cupola is heated to 1100-1200 ^о С. Then the cupola is put into operation and the charge is loaded (slag, broken brick, glass, mineral waste etc.). The mixture is loaded onto a water-cooled jumper.

 Gas combustion products from the overheating chamber go into the mine, heat and melt the mixture. Drops and jets of slag flow from the bridge through the passages between pipes 4 and ring 3 and accumulate on the bottom of the overheating chamber, where they overheat. Then, after turning on the spraying device 8, slag is formed from the slag melt, which enters the precipitation chamber for forming slag slabs.

 The implementation of the jumper with a water-cooled ring provides active cooling of the upper part of the lining of the overheating chamber along the entire perimeter, which ensures an increase in the life of the lining in the upper part of the chamber. Installing a ring with an inlet on the free section of the chamber ensures optimal slag runoff without contact with the lining of the chamber. Slag flows predominantly, bypassing the lining, in the form of droplets and jets freely falling from pipes and rings, which eliminates the chemical interaction of slag and lining, i.e. the most important lining-destroying factor in the cupola has been eliminated. At the same time, the presence of a lining in the overheating chamber provides good conditions for gas combustion and overheating of slag melt.

 Due to the fact that the jumpers are passed through the ring (and are not installed on the top or bottom of the ring), it is impossible to enter liquid slag at the junction of the pipes with the lining, thereby increasing the durability of the lining in these areas.

 In the proposed design of a gas cupola, the service life of the lining of the overheating chamber is increased by a factor of 2–3, the consumption of refractory materials for the lining of the overheating chamber is reduced by a factor of 1.5–2, the cost of lining is reduced, and the cost of 1 ton is reduced.

Claims (1)

 A GAS PLUG FOR PRODUCING MINERAL WOOL, containing a shaft in the form of a water jacket, an overheating chamber with fireproof walls expanding downward and separating the water jacket from the overheating chamber, a water-cooled jumper from pipes arranged in a row, characterized in that, in order to increase the service life of the fire lining, the jumper is made with a water-cooled ring adjacent to the inner walls of the overheating chamber and partially overlapping its cross section, and the jumper pipes are passed through the ring.

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