Are there any blowers for heating furnaces that use variable-frequency devices?
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Everyone, are there any blowers in heating furnaces that use variable-frequency devices? If it’s useful, what are its effects, and what are the characteristics in terms of operation and maintenance?
Yes, I know that some units are still in use, and the performance seems to be quite good. The air supply volume is adjusted by changing the fan speed via the excess air coefficient. Maintenance is basically the same as that of fans.
Yes, both the blower and the exhaust fan use variable frequency drives; operation involves increasing or decreasing the air volume by monitoring the oxygen content in the flue gas. It’s very easy to use.
Reply to 1# Niu Honghong: It can be increased as long as the opening degree of the damper is adjusted regularly. The investment is recovered in about one to one and a half years. Choose a frequency converter for fans and water pumps. It offers convenient and precise adjustment, with significant energy-saving effects. Pay attention to the grounding of the signal wires during installation (to prevent interference).
But each burner requires a different amount of air; for example, there are those that use gas alone and those that use a mixture of gas and oil. For mixed combustion of oil and gas, the amount of air required is just right; however, when burning gas alone, there is an excess of air. If the total air supply is adjusted so that the air amount for burning gas is appropriate, then mixed combustion of oil and gas will result in a lack of oxygen, leading to black smoke. In such cases, it’s necessary to adjust the secondary air valve as well – isn’t that quite troublesome?
Reply to 5# Niu Honghong: In your case, the only option is to manually adjust the dampers at each burner’s air inlet.
Many of our customers have recovered their investment within half a year after switching their fans to variable frequency drives – it’s worth doing! If you’re willing to spend money, you can install electrically adjustable dampers; if you want to save money, you can use manual adjustment – and it’s not necessary to adjust them constantly all day long!
By using an inverter, it is possible to **reduce the power consumption of fans, which is very beneficial**
I wonder what the energy-saving effect is like? Also, can’t the inlet butterfly valve of the fan be removed? Does frequent adjustment of the rotational speed have a significant impact on the vibration level of the fan?