This article's table of contents introduction:
- Material: Q345 (Low-Alloy Steel)
- Application: Coal Gas Delivery & Dust Collection
- Key Features for "Powerful" & "Long Life"
- Recommended Fan Model Type
- Important Safety & Maintenance Notes
- Where to Source (Search Terms for Suppliers)
- Summary Checklist
Based on your query, it sounds like you are looking for a heavy-duty, long-lasting exhaust fan specifically designed for coal gas delivery environments (likely involving Q345 steel construction and high dust loads).
Here is a breakdown of what the key terms mean and what you should look for when sourcing this equipment.
Material: Q345 (Low-Alloy Steel)
- Why it matters: Q345 (now often replaced by Q355 in newer Chinese GB/T standards, but still widely referred to as Q345) is a high-strength, low-alloy structural steel.
- Corrosion & Wear: It offers 50% higher yield strength than standard Q235 carbon steel. For a dust collector fan handling abrasive coal dust and potentially corrosive gas byproducts (like sulfur compounds), Q345 provides better resistance to erosion and fatigue than standard mild steel.
- Application: The fan housing and impeller should be made of Q345 steel to handle the abrasive nature of coal dust and the structural stress of high-speed rotation.
Application: Coal Gas Delivery & Dust Collection
- Environmental Hazards:
- Explosive Risk: Coal gas (CO, H₂, CH₄) and fine coal dust are highly combustible.
- Abrasiveness: Coal dust erodes fan blades quickly.
- Corrosion: Condensation in the gas stream can create acidic conditions (e.g., sulfuric acid from sulfur in coal).
- Fan Type Required: Centrifugal Fan (not an axial fan). Specifically, you need a Industrial Dust Collection Exhaust Fan with a backward-curved or radial-tip impeller design. These are self-cleaning and less likely to clog.
Key Features for "Powerful" & "Long Life"
When searching for a vendor (e.g., on Made-in-China, Alibaba, or industrial suppliers), ensure the fan has these specifications:
| Feature | Requirement | Why |
|---|---|---|
| Impeller Material | Q345 Steel or 16Mn | Withstands high tip speeds and particle impacts. |
| Housing Thickness | 6mm – 12mm (depending on size) | Preents wear-through from dust erosion. |
| Shaft Seals | Carbon-filled PTFE or Graphite | Prevents coal gas leakage into the motor or environment. |
| Motor | Explosion-proof (Ex d IIB T4 or higher) | Critical: Standard motors can ignite coal gas. |
| Bearing | Heavy-duty spherical roller bearings | Handles radial loads from dust buildup on blades. |
| Lining | Optional: Ceramic tile or Wear-resistant Steel | For extreme abrasion, apply a lining to the housing. |
| Vibration Monitoring | Integrated vibration sensors | Detects imbalance from dust buildup, preventing catastrophic failure. |
Recommended Fan Model Type
You likely need a DQ (Dust Removal) or C6-48 / 9-26 type centrifugal fan, but modified for gas-tight operation.
- Type: Single Inlet, Double Support (SISW) or Overhung Impeller.
- Pressure: Medium to High Pressure (≥ 2500 Pa depending on ductwork).
- Flow Rate: Based on your gas volume (m³/h).
Important Safety & Maintenance Notes
- Variable Frequency Drive (VFD): Use a VFD to control speed. Coal gas systems have variable flow requirements. The VFD must also be explosion-proof if installed in a hazardous area.
- Drainage: Ensure the fan has a drain plug at the lowest point. Coal gas condensate is acidic and must be drained regularly.
- Inlet Box: A spark-resistant inlet box and impeller are recommended. This can be achieved by coating the inlet cone with aluminum or brass (non-sparking).
- Clean-out Doors: The fan must have access doors for cleaning accumulated coal dust off the blades.
Where to Source (Search Terms for Suppliers)
- "Q345 centrifugal dust collector fan"
- "Explosion-proof coal gas exhaust fan"
- "High temperature wear resistant industrial fan for coal gas"
- "C6-48 dust removal fan with Q345 impeller"
Summary Checklist
| Item | Specification |
|---|---|
| Housing | Q345 Steel |
| Impeller | Backward-curved, Q345 or 16Mn |
| Motor | Ex d IIB T4 (Explosion-proof) |
| Seal | Gas-tight mechanical seal |
| Application | Coal gas conveying with high dust load |
Bottom Line: You need a Q345 steel, explosion-proof centrifugal fan with a heavy-duty wear lining and gas-tight seals. A standard HVAC fan will fail quickly and dangerously in this environment.
Would you like a recommendation for a specific voltage (220V/380V/690V) or a specific airflow (m³/h) and pressure (Pa) requirement?
