On-off burner control by cycle time variation

Details On-off burner control by cycle time variation On-off burner control by cycle time variation

1989-08-30

1990-07-03

Wayner, William E.

Combustion

Combustion bursts or flare-ups in pulses or serial pattern

236 46F, 431 75, F23C 1104

Patent

active

049386840

ABSTRACT:
The burners of a fuel-fired system are controlled by means of a feedback control system for temperature control. The control system comprises temperature measuring means, a controller for temperature control, final burner controlling means translating the output from the controller into an appropriate burner input rate, and a digital central processing unit determining pulse spacing (t.sub.ps), pulse duration (tON) and pulse separation (tOFF). A minimum pulse spacing (.sup.t ps.sub.min), being the sum of the minimum pulse duration (tON.sub.min) and the minimum pulse separation (tOFF.sub.min), is present and used as an input rate reference value. Using the input rate reference value for the minimum pulse spacing, the burner input rate is controlled in accordance with process requirements by varying pulse spacing (t.sub.ps) through varying pulse separation or pulse duration. For input rates lower than the input rate reference value, pulse separation is increased, and for input rates higher than the input rate reference value, pulse duration is increased with pulse separation remaining the minimum pulse separation. The feedback control system substantially improves the rangeability of burners controlled by ON-OFF control systems, minimizing pulse spacing and achieving correspondingly rapid response.

REFERENCES:
patent: 3219095 (1965-11-01), Nilsson
patent: 4552304 (1985-12-01), Papazian
patent: 4583936 (1986-04-01), Krieger

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