1. Blast Furnace Gas Composition

Blast furnace gas is a combustible gas byproduct of the ironmaking process in a blast furnace. Its approximate composition is: carbon dioxide 6-22%, carbon monoxide 21-26%, hydrogen 1-4%, nitrogen 53-57%, hydrocarbons 0.2-0.5%, and a small amount of sulfur dioxide.

The ignition point of blast furnace gas is not high, and there seems to be no obstacle to ignition. However, in the actual combustion process, due to various factors, the temperature of the mixed gas must be much higher than the ignition point to ensure stable combustion. Blast furnace gas has a low calorific value, approximately 800-1000 Kcal/Nm³, and is not easily ignited directly. It requires the assistance of high-calorific value fuels such as natural gas and liquefied petroleum gas to ensure combustion safety.

2. Blast Furnace Gas Characteristics

(1) Blast furnace gas has a high proportion of incombustible components and relatively few combustible components (approximately 30%), resulting in a low calorific value, generally 3344-4180 kJ/Nm³. Blast furnace gas is a colorless and odorless gas, but highly toxic due to its high CO content.

(2) Safety regulations specify a limit of 1 meter; the CO content in the air cannot exceed 30 mg;

(3) Ignition temperature is greater than 700℃. Blast furnace gas contains H2 (1.5-3.0%), CH4 (0.2-0.5%), CO (25-30%), CO2 (9-12%), N2 (55-60%), O2 (0.2-0.4%); density is 1.29-1.30 Kg/Nm³.

3. Blast Furnace Gas Application Scenarios

Blast furnace gas burners are mechatronics equipment, designed with various safety interlock functions. Interfacing with the central control room DCS allows for local and remote automatic control.

Blast Furnace Gas Burner Equipment Characteristics:

1. Calorific value 750 Kcal/m³

2. Operating pressure 10-20 kpa

3. Adjustment range 1:10

4. Ignition method: Electronic high-voltage ignition. High-power burners are equipped with ignition guns. It is not easily ignited directly and requires

assistance from high-calorific value fuels such as natural gas and liquefied petroleum gas to ensure combustion safety.

5. Flame detection method: UV ultraviolet detection, equipped with dual-probe flame detection, flameout protection, automatic ignition, and emergency shutdown functions.

6. Temperature control method: Uses dual electric control valves. Can be configured with damper proportional control, frequency conversion proportional control, touchscreen digital control, and PLC frequency conversion proportional control systems according to user requirements.

7. Flame combustion state: The flame is strong and powerful, and the combustion is complete,

8. Standard configuration: Explosion-proof blower, explosion-proof electrical cabinet, electronic ignition, UV ultraviolet detection, dual pneumatic quick-cut valves, gas electric control valve, gas high and low pressure switches, gas leak alarm, etc.

9. Combustion control system: The gas combustion system has remote/local ignition operation, ignition indication, flameout alarm and quick-cut protection, gas high-pressure protection, gas low-pressure protection, combustion air low-pressure protection, gas leak alarm and interlock protection,

10. Combustion system: Widely used in steel plants for online/offline baking of ladles, intermediate vessel baking, scrap preheating, hot blast stoves, industrial furnaces, boilers, etc. Zhongwei Company is responsible for design and system integration services.

Gas Boiler

Hot Blast Stove

4. Conventional Burner Technical Parameters

Note: Product specifications can be customized according to user needs

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