This article's table of contents introduction:
- Typical Specification Match
- Suggested Technical Data Sheet (for Purchase)
- Specific Considerations for Urea Fertilizer Plant
- Summary for your Inquiry
It looks like you are describing a specification or requirement for an Induced Draft (ID) Fan for a power plant or a urea fertilizer plant. Based on your keywords, I can break down what this likely means and provide a typical specification.
Key Terms Parsed:
- Boiler ID Fan: Induced Draft Fan used to pull flue gases out of the boiler and send them to the chimney.
- 900,000 Nm³/hr: Flow rate at Normal conditions (0°C, 1.01325 bar).
- Power Plant ID Fan Up To 200MW: The fan is likely for a captive power plant (CPP) that supplies power to a urea fertilizer plant, sized up to 200 MW capacity.
- Urea Fertilizer: The end-user industry. Urea plants typically need steam (from a boiler) and power, so this fan is likely for the boiler serving the urea synthesis unit.
Typical Specification Match
For a 200 MW thermal power plant (or a large industrial boiler supplying steam for a urea plant), a flow rate of 900,000 Nm³/hr is a very common size.
- Capacity: ~900,000 Nm³/hr
- Pressure Rise: Typically 300–500 mmWC (depending on boiler type and dust collector/scrubber pressure drop).
- Density: Flue gas is lighter than air (approx. 1.3 kg/Nm³ vs 1.2 kg/Nm³ for air).
- Application: Handling dirty, hot flue gas (typically 130°C–170°C after Air Preheater).
For Urea Fertilizer:
- The boiler might run on coal, petcoke, or natural gas.
- If coal-fired, the ID fan must be abrasion-resistant (due to fly ash).
- The reliability is critical because a boiler trip stops Urea production.
Suggested Technical Data Sheet (for Purchase)
If you are writing a tender or looking for a vendor, here is a typical data sheet for this fan:
| Parameter | Value | Unit |
|---|---|---|
| Type | Centrifugal (Radial/Backward Curved) | - |
| Flow Rate | 900,000 | Nm³/hr |
| Flow Rate (Actual) | ~1,200,000 – 1,400,000 (at 150°C) | Am³/hr |
| Total Pressure Rise | 450 – 600 | mmWC (or Pa) |
| Gas Temperature | 140 (normal) / 180 (max) | °C |
| Gas Density | ~0.85 (at operating temp) | kg/m³ |
| Dust Load | < 50 (coal) or < 5 (gas) | mg/Nm³ |
| Material (Impeller) | Corten / 16MnCr5 (abrasion resistant) | - |
| Drive | Motor via Coupling | - |
| Motor Power | 1800 – 2200 | kW |
| Speed (RPM) | ~ 750 – 990 | RPM |
| VFD Required? | Recommended for efficiency (especially for urea plant load variation) | - |
Specific Considerations for Urea Fertilizer Plant
- Load Variation: Urea plants often run at 70-100% load. A Variable Frequency Drive (VFD) on the ID fan saves significant power.
- Reliability: Urea synthesis is sensitive to pressure/steam fluctuations. The ID fan must have:
- High-quality bearings (SKF/FAG).
- Lube oil system (forced oil cooling).
- Spare rotor (many fertilizer plants buy a spare impeller).
- Corrosion: If the fuel contains sulfur (which makes SOx), and if the flue gas temperature drops below the acid dew point, the fan can corrode quickly. Stainless steel lining (SS 316L) may be required if using high sulfur fuel.
- Standby: Typically, one ID fan is 100% capacity, or two at 60% capacity (1 running + 1 standby) for critical urea plants.
Summary for your Inquiry
Q: Is there a standard ID fan for a 200MW Power Plant / Urea Boiler? A: Yes, 900,000 Nm³/hr is a standard flow rate for a single ID fan serving a boiler that provides steam for a ~200 MW (or ~400 TPH steam) lignite/coal boiler used in a urea fertilizer complex.
Common Vendors (India example):
- Flakt Woods
- Howden
- KCAT (Reynold / Heavy Engg)
- John Zink Hamworthy
Next Steps:
- Do you need a fan specification sheet (PO document)?
- Are you looking for a repair/retrofit for an existing fan?
- Do you need a motor power calculation for this flow?
Let me know if you need a more detailed calculation (e.g., actual volume flow at temperature, or motor kW estimation).
