Induced-draft fan for industrial ultra-low emission retrofit projects

Project: Ultra-Low Emission Retrofitting for Industrial Furnaces and Kilns | China

As industrial emission standards become increasingly stringent, upgrading existing flue gas systems has emerged as a critical task for many industrial facilities. Such ultra-low emission retrofit projects typically require a meticulous assessment of existing equipment, system resistance, and operational conditions to ensure the reliable performance of the upgraded systems.

In one such ultra-low emission retrofit project for industrial furnaces and kilns, SIMO Blower supplied two customized induced-draft (ID) fans for the systems serving Furnaces 1 and 2.

Rather than applying an identical fan configuration to both systems, SIMO developed specific technical specifications for each fan, tailored to the unique airflow, static pressure, temperature, and installation requirements of the respective furnace or kiln.

Project Requirements: Operational Needs of Two Kiln/Furnace Systems Under Varying Conditions

Induced-draft (ID) fans play a critical role in industrial flue gas treatment. They provide the necessary pressure to drive the flow of flue gas through interconnected ductwork and downstream treatment equipment.

During the implementation of ultra-low emission retrofits, changes to the flue gas treatment configuration may affect system resistance and the operational requirements for the fans. Consequently, fan selection must be based on the actual operating conditions of the upgraded system.

In this project, the two kiln/furnace systems have distinct requirements regarding airflow volume and fan configuration.

Induced Draft Fan for Boiler No. 1

Model: 3000SWB21F
Airflow: 92,900 Nm³/h
Static Pressure: 11,544 Pa
Operating Temperature: 123°C
Rotation: Counter-clockwise (Left-hand), 135°
Outlet Position: 90°

Induced Draft Fan for Boiler No. 2

Model: 2950SWB26N5F
Airflow: 123,123 Nm³/h
Static Pressure: 11,720 Pa
Operating Temperature: 123°C
Rotation: Clockwise (Right-hand), 135°
Outlet Position: 90°

Both fans are designed according to the specific requirements of their respective systems, featuring different airflow capacities and directions of rotation to suit the installation conditions of the project.

Customized Fan Configuration by SIMO

For this project, SIMO Blower supplied two centrifugal induced-draft fans, tailored to meet specific structural and material requirements.
1. Wear-Resistant Impeller Design
The project required the impellers to be manufactured from Q390 steel and treated with a hardfacing (weld overlay) process. This configuration ensures the necessary wear resistance for handling industrial flue gas.
2. Casing and Maintenance Features
The fan casings are equipped with access doors, and the bottom sections feature drain valves, facilitating equipment inspection and maintenance.
3. Shaft-End Sealing
In accordance with project specifications, the shaft ends utilize a gland packing (stuffing box) sealing arrangement.
4. Customized Rotation and Outlet Orientation
The two fans feature different directions of rotation, with specific requirements for the orientation of their outlets. Confirming these details during the design and manufacturing phases is essential to ensure the equipment aligns perfectly with the existing installation layout.

Why the Selection of Induced-Draft Fans Is Critical in Ultra-Low Emission Retrofits

An ultra-low emission retrofit involves more than just the addition of flue-gas treatment equipment; it can also alter the operating conditions of the entire flue-gas handling system.

An induced-draft (ID) fan must provide sufficient airflow and pressure to overcome the resistance of the upgraded system. If the existing fan cannot adapt to these new operating conditions, it may lead to inadequate airflow, operational instability, or increased energy consumption.

When selecting or replacing an induced-draft fan for an emission retrofit project, the following factors should be carefully evaluated:
● Actual airflow and static pressure requirements following the retrofit.
● Flue-gas temperature and operating characteristics.
● System resistance and downstream treatment equipment.
● Dust characteristics and potential impeller wear.
● Fan rotation direction and outlet orientation.
● Requirements for shaft seals, drainage, and maintenance.
● Motor power and variable-frequency drive (VFD) operating conditions.
A well-matched fan configuration is essential to ensuring the reliable operation of the upgraded flue-gas system.

SIMO Blower: Customized Induced-Draft Fan Solutions for Industrial Emission Upgrades

SIMO Blower specializes in providing customized centrifugal fan solutions for sectors including industrial boilers, metallurgy, steel production, cement manufacturing, chemical processing, and environmental protection.
Our product and engineering service portfolio includes:
● Industrial induced-draft fans.
● Fans for high-temperature flue gas.
● Fans for dust collection/removal systems.
● High-pressure centrifugal fans.
● Wear-resistant centrifugal fan configurations.
● Customized solutions for fan replacement and system retrofitting.
Whether for new industrial facilities or the upgrading of existing systems, SIMO conducts a comprehensive assessment of performance requirements, operating conditions, and installation specifics to develop the optimal equipment configuration for your needs.

Are you planning an ultra-low emission retrofit or an induced-draft (ID) fan replacement project?

If your existing flue gas system is undergoing an emissions upgrade, selecting the right ID fan is critical to ensuring compatibility with the new operating conditions.

SIMO Blower welcomes inquiries from industrial facility owners, EPC contractors, environmental engineering firms, and equipment suppliers.

To help our engineering team evaluate your project, please provide the following information:
Required airflow volume and static pressure.
Flue gas temperature and characteristics.
Existing fan model and operational data.
System resistance or equipment configuration following the upgrade.
Installation dimensions and direction of rotation.
Motor power and drive requirements.

Contact SIMO Blower for customized ID fan solutions tailored to your industrial emission retrofit project.