This article's table of contents introduction:
- Interpretation of the Title
- Critical Design Considerations for a Biomass Boiler Fan
- Typical Specification (Example)
- Important Warning: Q235 vs. Biomass
- What is the next step?
It appears you are looking for information or a specification regarding a 4-110kW Q235 Carbon Structural Steel Biomass Boiler System Blower and Induced Draft Fan.
To provide the most accurate engineering or procurement advice, I need to clarify a few things. However, based on the keywords provided, here is a professional breakdown of what this likely refers to and the critical parameters to consider.
Interpretation of the Title
- 4-110kW: This likely indicates a power range (4 kW to 110 kW) for the fan motors, or possibly a specific model series with a power rating in that range. In the context of a biomass boiler, 110 kW is a significant amount of power, suggesting a large industrial boiler (e.g., several MW thermal output).
- Q235 Carbon Structural Steel: This is the material for the fan casing and impeller. Q235 is a standard Chinese grade (similar to ASTM A36 or EN S235JR). It is suitable for biomass applications because it is cost-effective and strong, but it is not corrosion-resistant against acidic condensate.
- Biomass Boiler System: The fan must handle hot, dusty, and potentially corrosive flue gas (from burning wood chips, pellets, or agricultural waste).
- Blower and Induced Draft Fan: This is a Forced Draft (FD) Fan (pushes air into the boiler) and an Induced Draft (ID) Fan (pulls flue gas out of the boiler and through the chimney).
Critical Design Considerations for a Biomass Boiler Fan
When selecting or specifying a fan for this system, do not just look at power (kW). You must define the following:
| Parameter | Why it matters for Q235 & Biomass |
|---|---|
| Temperature | Q235 structural steel has a safe limit around 350°C (662°F) for the casing. If the gas is hotter (which is common in a boiler), you must use an alloy steel or a cooling system. ID fans often handle hot gas. |
| Abrasion / Dust | Biomass flue gas contains fly ash and unburnt particles. Q235 is soft; the impeller will erode quickly. You may need wear-resistant liners or hardened impeller blades. |
| Corrosion | Biomass flue gas contains moisture and acids (HCL, H2SO4). If the gas temperature drops below the Acid Dew Point (~100-120°C), Q235 will rust rapidly. Stainless steel (304/316) is usually required for ID fans. |
| Fan Type | FD Fan: Centrifugal, forward-curved or radial blades. ID Fan: Backward-curved or radial blades (for efficiency and to handle dust). |
Typical Specification (Example)
If you were to order this fan for a large industrial biomass boiler, the spec sheet would look like this:
Item: Induced Draft Fan (ID Fan)
- Model: 4-110kW (or specific airflow/ pressure model)
- Material: Q235 Carbon Steel (Casing & Impeller)
- Application: Biomass Flue Gas Extraction
- Certification: CE / ISO (Standard industrial)
- Power: 110 kW (typical for a high-pressure, high-volume application)
- Voltage: 380V / 660V / 690V (3-phase)
- Speed: 1450 or 980 RPM (dependent on pressure/flow)
- Bearing Type: Roller bearings with external cooling fins or water cooling (for hot gas)
- Drive: Direct drive or V-belt (V-belt allows speed adjustment)
Physical Specifications (Approximate for a 110kW fan):
- Weight: ~1,500 - 2,500 kg
- Inlet Diameter: ~800 mm - 1200 mm
- Outlet Size: ~600 mm x 600 mm (rectangular)
- Max Flow: ~40,000 - 80,000 m³/hr (depending on pressure)
Important Warning: Q235 vs. Biomass
If the system is an Induced Draft Fan (ID Fan) pulling flue gas from a biomass boiler:
- Q235 will fail quickly if the gas contains moisture or acidic compounds.
- You will likely need Stainless Steel (Like 304 or 316L) for the impeller and possibly a corrosion-resistant coating for the casing.
- Do not assume Q235 is sufficient just because it is structural steel. The cost to replace a corroded impeller in 6 months is much higher than buying the correct material upfront.
What is the next step?
To help you further, please provide one of the following:
- Are you buying or selling this fan?
- What is the specific model number (e.g., "4-72-5A") or the airflow (m³/h) and pressure (Pa) you need?
- Is the fan for the air intake (FD) or the exhaust (ID)?
Short Answer for Procurement: If you are looking for a standard industrial fan with a Q235 casing for a biomass boiler, ensure it is specifically rated for "High Temperature" (>200°C) and has an "Anti-abrasion" impeller. However, for the ID fan, strongly consider upgrading to a 304 Stainless Steel impeller.
