CPC F23N 3/005 (2013.01) [F23L 1/00 (2013.01); F23L 3/00 (2013.01); F23L 13/04 (2013.01); F23N 2235/06 (2020.01)] | 11 Claims |
1. A device for extending a turndown ratio of a gas-fired burner system, the device comprising:
a variable area device configured to adjust a cross-sectional area of a passage between a blower outlet of the gas-fired burner system and a burner inlet of the gas-fired burner system, wherein the variable area device is located outside of the passage, wherein the variable area device is a mechanical iris, which comprises a first ring and a second ring, and a flexible material that is configured to twist open or closed based on a rotation of the second ring; and
an actuator, wherein the actuator is configured to rotate the second ring to adjust a configuration of the variable area device, thereby adjusting the cross-sectional area of the passage.
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