(gas + pulverized coal + oxygen) Burns Preheated Ladle Scrap

The scrap baking device is a special equipment for baking steel and scrap in molten iron tanks. It is mainly used for the baking of various scrap steel that heats up quickly in front of the online furnace. The performance of the baking device has a great influence on the steel production temperature, steelmaking operation rate, furnace age, etc. Scrap baking is between the two main production processes of steelmaking and ironmaking, and the baking temperature of scrap plays an important role in coordinating the overall production, and it is of greater significance to the converter to consume more scrap.

Guided installation
Debug the installation
2 months
One year
wooden box
Copper/Iron water-cooled coils
Steelmaking process

Route:

Scrap steel is added to ladle→ converter gas + pulverized coal + oxygen combustion preheats scrap→ converter steel connection → enters refining;

Main technical parameters:

1. Oxygen consumption: 27Nm3/ton scrap×0.4 yuan/Nm3=10.8 yuan

2. Converter gas consumption: 50Nm3/ton scrap×0.2 yuan/Nm3+=about 10 yuan

or (blast furnace gas: 85Nm3/ton scrap)

3. Pulverized coal energy consumption: 10Kg/t scrap (calorific value 5500 kcal/kg) × 0.6 yuan/kg=10.8 yuan

4. Flame exit speed: 1.9--2 Mach

Field test, before use:

Steel production temperature: about 1610 °C

Bag temperature before refining: 1540°C (ladle temperature 700-800 °C)

Temperature of continuous casting bag after refining: 1580 °C

Refining heating electrode consumption: 0.3kg/t

Power consumption for refining and heating: 32 degrees/t

After use:

Steel output temperature: about 1600°C

Bag temperature before refining: 1550 °C (scrap and ladle temperature 1100 °C)

Temperature of continuous casting bag after refining: 1580°C

Refining and heating electrode consumption: 0.26kg/t

Power consumption for refining and heating: 26 kWh/t

Pure oxygen combustion ton scrap preheating cost:

Gas + pulverized coal: 20.8 yuan/t scrap

Oxygen: 27Nm³×0.4 yuan/Nm³=10.8 yuan

Nitrogen and circulating cooling water: about 1 yuan / t scrap

Consumption of refining and heating electrode: 0.26kg×20000 yuan/t=5.2 yuan

Power consumption for refining and heating: 26×0.7 yuan / kWh = 18.2 yuan

Differential ferroalloy: 20kg×6000/t=120 yuan

Scrap preheating labor cost: about 1 yuan / t scrap

Total preheating cost of using pure oxygen combustion tons of steel: 177 yuan

That is to say: using pure oxygen combustion scrap preheating system, the cost of smelting a ton of steel only needs: 177 yuan!