Definition and Function of Jinglan Environmental Protection's Ball Valve
The ball valve (also known as the spray gun check valve) is a critical component in the blast furnace pulverized coal injection system, primarily used to control pulverized coal transportation and prevent the leakage of high-temperature gas from the furnace. Its core functions include:
Automatic Opening and Closing: Opens when the coal injection lance is inserted and automatically closes via ball gravity or pressure difference when retracted, sealing the hot air inside the furnace;
Safety Protection: Prevents backflow of high-temperature gas (≤350°C) and pulverized coal from the blast furnace, ensuring operational safety;
Quick Connection: Works with the quick-connect fitting of the coal injection lance to achieve efficient sealing and disassembly.

Main Types of Ball Valves
1. Classification by Shape
Date Pit-shaped Ball Valve: Streamlined design, suitable for straight blowpipe connections, reducing airflow resistance;
Square Ball Valve: Compact structure, easy to install in space-constrained areas;
Elbow-shaped/Gourd-shaped: Adapts to special pipeline layouts, such as complex configurations in blast furnace pulverized coal injection systems.
2. Classification by Function
DZF-I Type: Basic model, suitable for conventional coal injection scenarios, pressure resistance of 0.6MPa;
DZF-II Type: Enhanced sealing, shell test pressure up to 0.9MPa, suitable for high-pressure environments.

Technical Parameters and Performance
Temperature Resistance: ≤350°C, materials mostly stainless steel or high-temperature resistant alloys;
Sealing Pressure: 0.66MPa (sealing test pressure), ensuring no leakage;
Applicable Media: Pulverized coal, dust-containing gas, water, oil, etc.
Typical Application Scenarios
Blast Furnace Pulverized Coal Injection System: Installed on the straight blowpipe, connected to the coal injection lance to achieve coal injection and sealing;
Pneumatic Conveying: Serves as a check valve to prevent material backflow, improving conveying stability.

Technological Development Trends
Intelligent Improvements: Some new ball valves integrate pressure sensing chips to monitor sealing status in real-time;
Structural Optimization: Such as arc-rotating spray wheel design, improving pulverized coal atomization and combustion efficiency.