SU1759546A1 - Method of heating of lining of metallurgical ladles - Google Patents

Abstract

SUMMARY OF THE INVENTION: Before burning gas in the ladle, the gap between the ladle and the lid is closed with a solid partition, forming an enclosed space between them, and after holding the lining at a temperature of about 1200 ° C for 20-30 minutes, the partition is removed. 3 il.

Description

The invention relates to metallurgy and can be used to heat the lining of a ladle before taking the melt.

A known method of heating the lining of the bucket, in which heating of the lining is carried out by feeding the bucket under the lid with burners and exhaust unit, followed by gas combustion and removal of combustion products.

A disadvantage of the known technical solution is its low efficiency in the process of heating the lining. This is due to the fact that during operation there is no tightness between the lid and the bucket, which leads to heat loss, emissions of combustion products and air leaks. In addition, in the process of working, it is necessary to systematically raise and lower the bulky lid with a burner to it and a combustion product drainage unit, which also reduces the heating efficiency of the lining.

The aim of the invention is to increase the efficiency of the lining heating process.

For this, the gap between the bucket and the lid is covered with a solid partition, forming a closed space between them, and after holding the lining at a temperature of about 1200 ° C for 20-30 min, the partition is removed.

Figure 1 shows the equipment in the process of heating the lining; Fig. 2 is a view A in Fig. 1 (elements of a gas and water supply system); Fig. 3 shows a node I in Fig. 1 (closure of the gap with a partition and a seal between the bucket and the cover).

In accordance with this method, a self-propelled trolley 1 with a bucket 2 mounted on it is fed under the lid with the burner and exhaust unit. On the platform 3 there are 4 drives with flexible suspensions 5 connected to the ring 6. By turning on the drives, the ring on the hangers is lowered moreover, thanks to the rollers 8 located on the brackets 7, which are kat 1/1

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By controlling 9, fixed on the body 10 to the lined cover 11, it closes the gap between the cover and the bucket. Then, the burner 12 and the exhaust unit 13 for discharging the combustion products are turned on. The tightness of the overlap is ensured by the presence on the cover in the groove of the seal 14 of a closed rigid partition 15 supported on a circular pad 16 of the bucket. From overheating, the septum on the inner side is protected by a coil 17 cooled by water supplied through hoses 18, which are allowed after the burner is turned on. The lining of the ladle is heated to a temperature of about 1200 ° C and. having sustained such a regime for 20-30 minutes, the heating is stopped. The inclusion of actuators 4 ring 6 raise to its original position. The bucket carriage is then removed and the latter is guided to receive the next melt.

This mode is optimal, as it ensures the tightness of the gap between the bucket and the lid, which allows maximum use of fuel, eliminating the possibility of emissions of combustion products through leakages. Heating the lining to 1200 ° C reduces the temperature difference when pouring metal into the ladle. Heating below 1200 ° C and holding less than 20 minutes does not exclude the possibility of masonry cracking when pouring metal, and heating above 1200 ° C and holding over 30 minutes are not economical, as they lead to excessive fuel consumption and time without affecting the durability of the lining.

For example, a steel teeming ladle with a capacity of 150 tons with a lining temperature after draining metal of about 800 ° € was installed on a self-propelled trolley 1. The lining of the bucket was made of magnetically spinel-shaped. MSh-1 supporting mass according to TU 14-8-426433, which includes at least 50% MgO and on the order of 10-25% CgCOs. Then the bucket 2 of the self-propelled trolley 1 was fed under the cover 11. Turning on the actuators 4, the ring 6 with the closed rigid partition 15 on the flexible suspensions 5 was lowered until it tightly closed the cavity between the cover 11 and

bucket 2 due to docking with the external contour of the bucket. Thereafter, the supply of water for cooling to the coil 17, the system of the exhaust unit 13 and the burner 12; At the same time, gas consumption for the burner

was 400 m3 / h, and the air was about 4000 m / h. In this position, the lining temperature of the ladle was adjusted to 1200 ° C and held for 30 minutes. After that, energy was cut off and with the help of

for the actuators 4, the partition ring was raised, the cart was rolled out, the bucket was removed and guided to receive the next heat. The durability of the bucket lining increased by about 20%.

The use of the proposed method allows to increase the efficiency of heating the lining by eliminating heat loss through leaks and air leaks. Increases operational reliability, because Job

with a ring, and not with a bucket cover easier and better. The gas and energy consumption is reduced by eliminating heat losses and harmful suction, which reduces the time required to reheat the lining, and also improves the environment due to the tightness of the working area between the bucket and the cover of the installation.

Fo rmu l and z obre n i Method of heating the lining of metallurgical buckets, including feeding the bucket under the lid with a burner and exhaust unit, heating the lining by burning gas into the bucket and discharging combustion products, characterized in that , with the aim of

increase the efficiency of the process of heating the lining before burning the gas, cover the gap between the bucket and the lid with a solid partition, heat the lining to 1200 ° C for 20-30 minutes, after

5 of which the partition is removed.

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Claims (1)

Claim A method of heating the lining of metallurgical ladles, including feeding the bucket under the lid with a burner and an exhaust unit, heating the lining by burning gas in a bucket and removing combustion products, characterized in that, in order to increase the efficiency of the process of heating the lining before burning gas, the gap between the bucket and cover with a lid with a continuous partition, heat the lining to 1200 ° C for 20-30 minutes, after which the partition is removed. View Λ Fig.Z