CN2228213Y

CN2228213Y - Bottom-blowing gas supply element for electric arc furnace

Info

Publication number: CN2228213Y
Application number: CN 95219346
Authority: CN
Inventors: 张俊锡
Original assignee: Shougang Corp
Current assignee: Shougang Corp
Priority date: 1995-08-22
Filing date: 1995-08-22
Publication date: 1996-05-29
Anticipated expiration: 2005-08-22

Abstract

The utility model provides a bottom-blowing gas supply element for an electric arc furnace, comprising a gas supply brick, metallic capillary pipes, an air chamber and an air intake pipe, wherein, the gas supply brick is provided with one or a plurality of metallic capillary pipes, and the wall thickness of the metallic capillary pipes are thinner than 0.5 mm. A thick wall pipe is coated outside each of the metallic capillary pipes, and a method of high voltage impact and riveted connection is adopted. Thus, the problem of the welding of the metallic capillary pipes and the cover plate of the air chamber is solved. A thin wall metal pipe is adopted on the premise that the bottom blowing and the gas supply are satisfied. Thus, the material cost is reduced and the investment is saved.

Description

EAF Bottom Blowing Gas Components

The present invention relates to a kind of electric-arc furnace steelmaking bottom-blowing air feed element.

One of major defect of ordinary arc furnace steel-making is that the molten bath stirring capacity is very low, cause that steel scrap, alloy melting are slow, slag and molten steel reaction not exclusively, the duration of heat weak point such as length and energy consumption height.

Electric arc furnace bottom blowing is at furnace bottom one air supply device to be installed, and is blown into inert gas, stirs to strengthen the molten bath, improve the molten bath dynamic conditions, can reduce power consumption, reduce ferroalloy and consumption of electrode, shorten the heat, improve desulfurization, decarburization efficient, obtain good economic effect.

Existing EAF Bottom Blowing Gas Components adopts metal capillary mostly, the MHP type of Ou Zhou DPP type, Japan for example, but the metal capillary wall is thin is difficult to solve with the Welding Problems of air chamber always, so, often adopt the nonstandard steel pipe of heavy wall to replace metal capillary.

The gas bottom blowing and supplying system for electric arc furnace that patent 92103505.5 provides solves bottom blowing air pressure less than 0.15MPa, even is that blocking problem does not take place air supply brick under zero the situation, but the Welding Problems of metal capillary and air chamber is unresolved.

The purpose of this utility model is to provide a kind of EAF Bottom Blowing Gas Components, both guaranteed the requirement of bottom blowing gas, solved the solder technology problem of metal capillary and air chamber again, bottom-blowing air feed element can not adopt the nonstandard steel pipe of heavy wall, to reach the purpose that saves material and improve result of use.

For achieving the above object, the EAF Bottom Blowing Gas Components that the utility model provides, form by air supply brick, metal capillary, air chamber, air inlet pipe, it is characterized in that: one or several metal capillaries are arranged in the refractory brick, metal capillary is inserted the air chamber upper cover plate, metal capillary and air chamber contact position add a sleeve pipe, and weld with upper cover plate.

The metal capillary wall thickness of EAF Bottom Blowing Gas Components is below 0.5mm.

Compared with prior art the utlity model has following advantage: the Welding Problems that has solved metal capillary and air chamber upper cover plate.Under the prerequisite that guarantees smelting process requirement and bottom blowing mixing effect, use metal capillary, reduced the cost of raw material, saved investment.

Description of drawings:

Accompanying drawing is the structural representation of the utility model EAF Bottom Blowing Gas Components.

In the accompanying drawing, 1 is that air supply brick, 2 is that metal capillary, 3 is that air chamber, 4 is that air inlet pipe, 5 is that thick-walled pipe, 6 is the air chamber upper cover plate.

Be described in further detail with reference to the accompanying drawings below:

Generally, bottom-blowing air feed element is when the metal capillary that adopts wall thickness below 0.5mm, metal capillary 2 is inserted into the air vent of air chamber upper cover plate 6, for preventing gas leakage, need metal capillary 2 and air chamber upper cover plate 6 firm welding, but upper cover plate thickness is generally at 4～8mm, and the metal capillary wall thickness is below 0.5mm, and during welding, upper cover plate also burns heat, metal capillary but melts, for addressing this problem, the utility model is riveted with impacting with high pressure at metal capillary overcoat one thick-walled pipe 5, guarantee the unimpeded of every metal capillary of ventilated element, and with air chamber upper cover plate 6 firm welding.The wall thickness of thick-walled pipe 5 will be selected according to the thickness of air chamber upper cover plate 6.

The utility model EAF Bottom Blowing Gas Components is at bottom blowing air pressure 0.1～0.6MPa, flow 4～16NM ³Under/h the situation, gas leak phenomenon not taking place, guarantees that the electric arc furnaces air supply intensity is at 0.003～0.015NM ³The obstruction accident does not take place in/min.t.

Claims

1, a kind of EAF Bottom Blowing Gas Components, form by air supply brick, metal capillary, air chamber, air inlet pipe, it is characterized in that: one or several metal capillaries are arranged in the refractory brick, metal capillary is inserted the air chamber upper cover plate, metal capillary and air chamber contact position add a sleeve pipe, and weld with upper cover plate.

2, EAF Bottom Blowing Gas Components as claimed in claim 1 is characterized in that: the metal capillary wall thickness is below 0.5mm.