Secondary fan for boiler systems

The secondary fan is the core equipment for combustion control in the boiler system. Its main functions are as follows:

1. Supplementing combustion oxygen

Secondary air accounts for about 60% of the total air volume and is injected into the furnace through stratification or swirl to provide sufficient oxygen for complete combustion of the fuel and reduce unburned carbon loss.

In biomass boilers, secondary air accounts for 20% to 40%. The air volume is dynamically adjusted through multi-stage injection to improve combustion efficiency.

2. Optimizing the combustion process

Enhance gas-solid contact through turbulent mixing and shorten combustion time (such as the control of flame shape by swirl direction in counter-fired boilers).

Adjust the furnace temperature distribution to avoid local overheating or slagging (such as secondary air control of bed temperature in circulating fluidized bed boilers).

3. Environmental protection and efficiency improvement

Reduce nitrogen oxide (NOx) emissions: Through staged combustion and optimized oxygen distribution, NOx generation can be reduced by 15% to 30%.

Prevent ash accumulation: High-speed secondary air forms a storm powder structure to reduce ash adhesion to the furnace wall.

Typical application scenarios

Pulverized coal boiler: Secondary air is injected into the upper part of the furnace through the burner in layers, creating turbulence and promoting combustion.

Biomass boiler: Multi-stage secondary air injection combined with waste heat utilization increases thermal efficiency by approximately 5%.

Precautions

The secondary air input needs to be adjusted gradually according to the load to avoid drastic fluctuations in furnace temperature.

During design, the air volume needs to be dynamically matched based on fuel characteristics (such as biomass moisture).

Product Structure

Actual picture

Q: What is the monthly supply capacity?

50-100 units

Q: Do you offer quality assurance?

During the warranty period, if there are any quality issues with the product, please contact us for replacement

Q: Can samples be ordered?

Yes

Q: How is your after-sales service?

Monday-Sunday，7:30-18:00，Long-time online after-sales service is worry-free

Q: How can I keep up with the product progress if I don't go to your company?

After placing an order, we will report the production progress regularly

Q: What information do I need to provide to get an accurate quotation?

The operating conditions for the gas to be delivered include flow rate (m3/h), total pressure (Pa), temperature (℃), gas density (kg/m3), and the altitude of the usage location (m); the material of the fan; the voltage, frequency, protection level, explosion-proof level, and whether the motor is variable frequency or not.

Q: Can your packaging ensure the safety of the product?

We wrap the inlet and outlet of the fan, as well as the motor, with stretch film and then secure the fan in a wooden box, which can fully protect the product during transportation and handling.

Q: How long is the warranty period for the product?

1 year