This article's table of contents introduction:
- Interpretation of the Core Data
- Likely Fan Type & Function
- Typical Technical Specifications for a 36 t/H Boiler Fan
- Important Design Considerations
- What to ask the Fan Manufacturer
- Summary Answer
This query appears to be requesting information or specifications for a centrifugal fan (blower) used in a 2 x 36 t/H (tons per hour) thermal power generation setup.
Here is a technical breakdown of what this specification typically implies, the type of fan likely being referenced, and critical parameters.
Interpretation of the Core Data
- 2 x 36 t/H: This indicates the power plant has two (2) boilers, each with a steam generation capacity of 36 tons per hour. This is a small-scale industrial power plant (often used in biomass, waste-to-energy, or small coal plants), not a utility-scale unit.
- Centrifugal Fan/Blower: In a thermal power plant, three main types of centrifugal fans are used. Given the 36 t/H boiler size, the query likely refers to Induced Draft (ID) Fans or Forced Draft (FD) Fans.
Likely Fan Type & Function
Given the boiler size (36 t/H), this is likely a Biomass, Coal, or Oil-fired boiler.
- Forced Draft (FD) Fan:
- Function: Supplies primary air to the furnace for combustion.
- Characteristics: Handles clean, ambient air at relatively high pressure.
- Induced Draft (ID) Fan:
- Function: Extracts flue gases from the boiler, economizer, and dust collector, maintaining negative pressure in the furnace.
- Characteristics: Handles hot (typically 140°C – 180°C), dusty, and corrosive flue gases.
- Primary Air (PA) Fan:
- Function: Used for drying and transporting fuel (pulverized coal) in coal mills.
- Note: For a 36 t/H boiler, it might be a stoker-fired or fluidized bed boiler (like FBC/AFBC), which may not require a separate PA fan.
Typical Technical Specifications for a 36 t/H Boiler Fan
Based on standard industrial boiler designs, here are the approximate design parameters for a centrifugal fan for a 36 t/H boiler. These are estimates and must be verified by a thermal engineer.
| Parameter | Forced Draft (FD) Fan | Induced Draft (ID) Fan |
|---|---|---|
| Flow Rate (Capacity) | ~ 30,000 – 45,000 m³/h | ~ 55,000 – 75,000 m³/h |
| Total Pressure (Head) | 150 – 250 mmWC (1.5 - 2.5 kPa) | 250 – 400 mmWC (2.5 - 4.0 kPa) |
| Operating Temp. | Ambient (40°C max) | 140°C – 180°C (Design: 220°C) |
| Medium | Clean Air | Flue Gas (Dusty, SOx/NOx) |
| Blade Type | Forward Curve (High pressure) or Backward Inclined (Higher efficiency) | Radial or Backward Inclined (Wear-resistant) |
| Motor Power | ~ 45 – 75 kW | ~ 90 – 160 kW |
| Drive | Coupling (Direct or Bearing supported) | Coupling with VFD or Damper Control |
| Material | Carbon Steel (MS) | Corten Steel / SAILCOR / Alloy Steel (for heat & corrosion) |
| Impeller Dia. | ~ 1200 – 1600 mm | ~ 1600 – 2200 mm |
Important Design Considerations
- Regulation: For a 2x36 t/H plant, fan regulation is critical.
- Recommendation: Variable Frequency Drives (VFD) for ID and FD fans. This provides significant energy savings (30-40%) compared to inlet guide vanes or dampers.
- Erosion: For ID fans handling flue gas from solid fuel (biomass/coal), the impeller must have wear-resistant lining (e.g., hard-faced welding, ceramic tiles) or replaceable wear plates.
- Vibration Monitoring: Bearings must be equipped with temperature sensors (RTD/TC) and vibration pick-ups (accelerometers) for safe operation.
- Duct Configuration:
- FD Fan: Usually a single inlet/outlet duct connected to the air preheater.
- ID Fan: Typically installed after the dust collector (bag filter or ESP) to minimize dust load on the fan.
What to ask the Fan Manufacturer
When ordering a centrifugal blower for a 2x36 t/H thermal plant, you must specify:
- Type: FD, ID, or PA?
- Site Conditions: Altitude (affects air density), ambient temperature.
- Medium: Is it air (clean) or flue gas (state dust concentration in mg/Nm³, temperature, gas composition).
- Control Method: VFD, Inlet Guide Vanes (IGV), or Damper.
- Standards: Conformance to ISO 1940 (Balancing), API 610/ISO 13709 (if heavy duty), or Indian IS 12395.
Summary Answer
The 2x36 t/H Thermal Power Generation Centrifugal Fan/Blower typically refers to a pair of Induced Draft (ID) or Forced Draft (FD) fans for a 36 TPH boiler. The ID fan is the most critical and must be heavy-duty, handling hot flue gas (~180°C) with a flow rate around 60,000 - 70,000 m³/h and pressure of 300-400 mmWC, driven by a 110-150 kW motor with a VFD for efficiency.
