Boiler induced draft (ID) fans extract flue gas from industrial boiler systems, maintain the required furnace negative pressure, and overcome resistance from boiler passes, heat exchangers, dust collectors, dampers, and flue-gas ducts. These fans are selected according to the required airflow, system pressure, gas temperature, gas density, dust concentration, and site conditions.
Technical Parameters
|
Parameter |
Selection / Performance Range |
|
Fan Series |
Y6-30, Y5-47, Y5-48, Y8-39, Y9-38, Y4-73, GY5-51, GY6-51 |
|
Airflow Capacity |
655–667,000 m³/h |
|
Total Pressure |
727–10,980 Pa |
|
Gas Temperature |
Up to 250°C continuous; short-duration peaks up to 300°C, subject to fan construction and operating conditions |
|
Dust Concentration |
Up to 20 g/m³ |
|
Impeller Diameter |
300–3,000+ mm |
|
Impeller Speed |
960–2,900 rpm |
|
Peak Total Efficiency |
Up to 86%, depending on fan series, operating point, speed, and configuration |
|
Motor Power |
0.75–1,000+ kW |
|
Drive Type |
Belt drive, coupling drive, or direct drive |
|
Power Supply |
380–415 V, 6 kV, 10 kV; 50/60 Hz, 3-phase |
|
Rotation / Discharge |
CW or CCW; multiple discharge angles available |
|
Material Options |
Q235B, Q355B, NM400 wear plate, 304/316L stainless steel |
Applications & System Integration
Applications: Coal-fired, biomass, oil/gas, waste-heat recovery, and industrial steam boiler flue-gas extraction.
System Integration: Typically installed downstream of ESPs, baghouses, or cyclones and upstream of the exhaust stack, subject to the project flue-gas system layout.
Operational Function: Maintains the required furnace draft or negative pressure as boiler load changes.
Required Selection Data: Airflow (ACMH), system pressure/resistance, operating gas temperature, gas density, dust concentration, site elevation, operating conditions, motor voltage, and frequency.
Selection Verification
Duty Point Verification: Fan selection is checked against the required airflow and system pressure at the specified gas temperature and density. Shaft power, speed, and efficiency are verified at the selected operating point.
Operating Range: The selected duty point is checked against the fan performance curve to maintain stable operation and avoid operation near the stall region.
System Resistance: Selection calculations can account for resistance from boiler passes, economizers, air preheaters, dust collectors, dampers, and flue-gas ducting.
Drive Configuration & Airflow Control
Drive Options: Type D coupling drive with flexible pin or diaphragm coupling and protective guard; Type C belt drive is available for selected smaller-capacity applications.
Variable Speed: VFD-compatible configurations are available for airflow adjustment across different boiler load conditions.
Flow Control: IGVs or parallel dampers can be configured for startup and low-load airflow adjustment.
Performance Verification
Dynamic Balancing: Impellers can be dynamically balanced to ISO 21940-11 Grade G2.5 or G4.0 according to fan size, speed, and project requirements.
Mechanical Run Test: Factory mechanical run testing is available to verify rotation, vibration, and bearing operating conditions before shipment.
Mechanical Monitoring: Shaft vibration and bearing-housing temperature are checked during applicable factory tests.
Aerodynamic Testing: Airflow and pressure performance can be tested according to ISO 5801 or ANSI/AMCA 210 when specified by the project.
After-sales Support
Verify fan rotation and motor phase sequence before initial commissioning.
Remote or on-site vibration diagnosis and baseline verification are available.
Check bearing operating temperatures and lubrication conditions.
Inspect impeller wear and establish maintenance intervals according to operating conditions.
Replacement parts are identified by fan model and factory serial number to verify dimensional compatibility.
FAQ
Q: What information is required for an accurate quotation?
A: Provide gas volume (ACMH), operating temperature, dust load, system resistance, site elevation, voltage, and preferred drive type.
Q: Can the ID fan match our existing ESP/baghouse and ductwork without a full flue-gas redesign?
A: Existing ESPs, baghouses, and ductwork can be incorporated into the fan selection. Retrofit compatibility is verified against the existing duty point, installation dimensions, connection requirements, and system resistance before finalizing the fan configuration.
Q: What is the lead-time difference between standard direct-drive and custom coupling-drive units with VFDs?
A: Standard units typically ship within 25–35 days. Large custom units with coupling drives, high-voltage motors, or VFD integration generally require 40–60 days.
Q: What is included in the standard scope of supply?
A: The standard scope typically includes the fan, impeller, motor, base drive, and coupling or belt with guards. IGV/damper actuators, VFD panels, and auxiliary instruments are usually optional.
Q: How are spare parts identified for older units with missing or worn nameplates?
A: Parts are matched by fan model and factory serial number. If the nameplate is unclear, photos, order records, or historical documents can help identify the correct part.
Q: Can you provide a combined proposal and shipment for a multi-boiler project with FD and ID fans?
A: Yes. We can prepare a consolidated proposal and coordinate combined container loading and shipment.
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