New technology.

In the past two or three years, Dexing Group was the last in the bidding project of Guiyang Steel Plant of ADB from 65438 to 0997.

After winning the bid and signing a complete system of electric furnace and Kangtong for Guigang, Xining was successfully acquired.

Iron and Steel Works, Lianyuan Iron and Steel Company, Shaoguan Iron and Steel Company, Wuxi Xuelang Iron and Steel Company, Jigang Shi Heng Iron and Steel Company, Lake

Sun Yicheng North Iron and Steel Company Electric Furnace+Steelmaking System Supply Contract. Among them, Xining Iron and Steel Plant, Guiyang Iron and Steel Plant and Shao

The electric furnace+Kangtong system of Guan Steel Company was successfully put into production in 2000. On April 3, 2000,

Xining iron and steel plant produced 7 heats of qualified molten steel in the first shift of ignition and furnace opening. In the subsequent night shift, the workers

Without the on-site guidance of foreign experts, we realized our own operation and continuous production. Now it has entered a stable state.

In the production stage, the maximum daily steelmaking capacity is 24 heats, and the average daily steelmaking capacity is maintained at about 20 heats, which was approved in June 2000.

All performance tests. In addition, the daily output of 90 tons CON-STEEL electric furnace in Shaogang has exceeded 3 1 furnace; not have

Xixuelang Iron and Steel Company started smelting the first heat of steel in 75t CON-STEEL EAF 200 1 year on September 6th and September 4th 18.

Reach the level of 20 heats of steel per day.

The smelting process of Kangtong electric furnace has ten characteristics:

1. Preheating of scrap steel: Before the scrap steel enters the furnace, the flue gas generated in the furnace is preheated in the preheating section of the conveying channel, and the average.

The temperature is 600-650 DEG C; Second, the operation of steel retention: at least 30 tons of molten steel in the electric furnace, and then continuous feeding, electrode.

Power transmission, carbon oxygen gun operation, electric furnace always works in a flat molten pool state, which can reduce arc fluctuation; The third is sustainability.

Feeding: it is not necessary to stop and open the furnace cover frequently to reduce heat loss; Fourth, the furnace body structure is reasonable: supporting T.

BT eccentric bottom tapping device, tubular water-cooled furnace cover, furnace wall and furnace body are divided into upper and lower sections, which is convenient for maintenance; five

There is a blowing system in the furnace: supersonic water-cooled oxygen lance, self-consuming carbon lance and carbon injection system are adopted; Sixth, conduction.

Advanced system: the transformer is a side outlet, using copper-steel composite electrode arm and electrode water-cooling spray system; Seven is fuck.

Simple operation technology: leaving steel and slag, submerged arc single tank melting operation technology of foam slag; Eighth, set up mechanized feeding.

System: The electric furnace is equipped with two feeding systems. A bulk material supply system is specially used for supplying concrete.

Systematic feeding; A set of ferroalloy charging system after furnace is used for deoxidation and initial alloying during tapping after furnace.

; Ninth, the dust removal system is advanced: the electric furnace adopts CONSTEEL as the main smoke exhaust system, and at the same time, it is equipped with a top cover to exhaust smoke.

Auxiliary dust removal facilities; Tenth, in order to ensure that the flue gas of the electric furnace fully burns CO and eliminates harmful gases, it is set behind Constance.

A secondary combustion chamber was installed. The last feature is automatic control: Constance melting and charging process is adopted.

Control, Constance preheating combustion process control and foam slag optimization process control, etc.

Consti process is suitable for the operation of the following kinds of burden:

-Scrap steel: Without any pretreatment, what is listed in ISISI specification is electricity.

Various brands of scrap steel used in the furnace can be directly used to produce Consti electric furnace. Despite the preheating effect of packaging materials

Not as good as other types of scrap steel, it can also be used as part of the burden when necessary. According to ISISI specification, according to a certain proportion

The cut automobile plates, loose chips and iron drill chips are constant after being properly mixed with other brands of scrap steel in the electric arc furnace.

Good raw materials for electric furnace process.

-Scrap iron and pig iron: If available, it is very welcome to add scrap iron and pig iron to improve the purity of steel.

When the substance is properly distributed in the furnace charge, it is helpful to maintain the proper carbon content in the furnace charge.

-Cold direct reduced iron (DRI) and hot iron (HBI): These materials are smelted as electric furnaces and used for rolling flat plates.

Steel and high-quality steel are accepted as pure iron sources for billets needed by small steel mills. Hot iron can be loaded into konstanz together with scrap steel.

In the device. Cold direct reduced iron is preferably charged into a specific position of a preheater or directly into an electric furnace.

-Hot charging of direct reduced iron: Hot direct reduced iron is very beneficial when used in Constance process because of its high energy content.

This saving can improve the economic feasibility of building a direct reduction plant in areas with high natural gas cost. Consti electric furnace worker

Art can use different proportions of direct reduced iron and scrap steel.

-Hot metal from blast furnace, Corex and others: 30%-50% hot metal and preheated scrap steel.

It has great advantages when used in Kangtong electric furnace. In the Constance electric furnace process, hot molten iron can be added continuously and slowly.

In the electric furnace, so you don't have to pour the molten iron in the ladle into the open electric furnace, thus avoiding the addition of steel mills

When molten iron is used, serious environmental pollution and violent reaction usually occur.

-"Loose" automobile waste: In the Const process of steelmaking with automobile waste, the raw materials can be at most

It accounts for 25% of the metal burden, and can solve the unrecoverable part of the current cost of dealing with non-metallic automobile bodies.

A big problem. Because flue gas contains a lot of energy, steel mills can supply hot water, steam or electric energy at the same time.

Saving production cost is a great advantage of Kangtong electric furnace.

The production cost savings brought by Consti electric furnace smelting process mainly come from continuous feeding and stable smelting.

State. These factors determine that the total energy (electric energy and chemical energy) needed to be consumed in the smelting process is less, and it can be

Better and more effective use of energy. The production cost and saving of this electric furnace are divided into the following two parts: first, saving

About energy; The second is operational savings.

energy conservation

1, saving electricity. In addition to the remarkable advantages of scrap preheating, this technology is unique in that

Other conditions to reduce energy loss. In normal production, it is not necessary to open the furnace cover, so that the molten steel will not explode.

Exposed to the outside air, thus eliminating radiation and leakage losses. In Constance's way, it is always covered with foam slag.

The arc of the cover heats the molten steel, which melts the scrap steel, so that the energy transfer efficiency of the arc is very high and it is very fire-resistant.

Compared with the typical furnace top charging process, the radiation loss of materials, furnace top and water cooling plate is greatly reduced.

2. Power reduction. Compared with the traditional electric furnace with the same capacity, this process needs power from the power grid.

Use less force. Several feasibility studies in the United States and Europe show that the electricity bill can be reduced by at least 10% for this reason.

3. Less oxygen, no other fuel consumption. Blowing oxygen through a self-consuming oxygen gun or a water-cooled oxygen gun, so as to

35Nm 3/t oxygen can ensure that the smelting power consumption is lower than 340 kW h/t. The system does not need to be installed on an electric furnace.

A burner is provided, so no natural gas or other fuel is consumed.

4. The energy consumption of dust removal system is lower. It is not necessary to open the furnace cover when feeding with this process, which is different from the traditional

Compared with the intermittent operation mode, it only needs a smaller dust removal system, thus reducing the power required by the fan in the bag dust collection room.

Operation saving

First, the consumption of covered electrode is low. There are several reasons for reducing electrode consumption in Const process: in fact, no electrode is broken.

Cracking (due to open pool operation); The gasification atmosphere in the electric furnace is reduced, and the consumption is reduced; Because of the more stable power environment

The current does not fluctuate greatly, resulting in lower consumption; There is no need to open the furnace cover for charging, thus exposing the electrode to the ambient air.

In the air; Using this technology, the electrode consumption of AC electric furnace is about 1.5- 1.6 kg/t, and the electrode consumption is reduced by using DC electric furnace.

The consumption is about1kg/mt.

B, high yield of scrap steel-molten steel. The FeO content in slag was reduced by using Kangtong electric furnace process.

By reducing the metal loss in slag removal, the metal yield from scrap steel to molten steel will increase by at least 1% to 2%. in fact

The molten pool is in a continuous refining state, and due to the high density and continuity of the internal reaction between molten steel and slag

FeO content is kept low and in balance with carbon in the molten pool. In traditional electric furnace smelting, each heat of steel

The furnace is in the flat bath refining stage only after 10 to 15 minutes after power-on.

C, less dust pollution. Because of the low velocity of flue gas in the preheating section of Kangtong electric furnace, the dust in the flue gas will

Deposited on scrap steel and sent back to the electric furnace. In Meigang, the powder produced by this continuous feeding system

The dust is 1 1 kg/ton. In the past, the dust produced by the same furnace was 16kg/ ton. The amount of dust can be reduced.

30%。

D, the number of working hours is small. Usually in the traditional steelmaking workshop, two large-tonnage crown blocks are needed, one for hanging basket.

Shipment, one for lifting ladle. Using Kangtong electric furnace technology, steel can be loaded.

Bag crane. Once a week to twice a week, it is used to continuously produce the shape of the first initial molten pool in the batch.

All right. Then there is no need for a crane to load the tank.

After more than ten years of industrial operation, Constance process has been proved to be reliable and endowed with economic life.

Means of force. The smelting workshop adopting this process can save electricity, various consumption, labor expenditure and dust treatment.

. The production level continued to improve. Due to the reduction of noise and smoke, especially the reasonable control of harmful smoke

The environment of steelmaking workshop has been greatly improved.

With 1995, Dexing Group of Italy successfully acquired Intel Steel Company, in this short period of 3-

In recent five years, Constance process has been gradually accepted by steel mills all over the world, and its advantages have gradually emerged.

In the fierce competition of furnace type. Ameris, the first American steel company to build Constance system in the United States.

Teel) and NucorSteel, because they are satisfied with the comprehensive benefits brought by Constance in their decision-making.

When expanding the production scale and reforming the steelmaking system, Constance system was selected again. Two companies

Their second Constance was put into production in 2000.