Liquid heaters and vaporizers – Automatic control of fluid fuel and water – Once through
Patent
1986-12-18
1988-01-05
Favors, Edward G.
Liquid heaters and vaporizers
Automatic control of fluid fuel and water
Once through
236 14, 364494, F22B 3742, F22D 500
Patent
active
047168587
ABSTRACT:
An automatic firing rate control mode arrangement is provided as a method of operation within a flame safeguard sequencer. The system uses proportional control squared, an integration which reflects the past load history to determine the present load, and further has a constant which relates the rate of change of pressure with respect to time in order to make more responsive the normal load control operation. The system is also capable of on-off control that will hold the system in low fire to allow for stabilization, and to avoid thermal shock to a boiler.
REFERENCES:
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patent: 4003342 (1977-01-01), Hodgson
patent: 4373663 (1983-02-01), Hammer
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patent: 4457266 (1984-07-01), La Spisa
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patent: 4574746 (1986-03-01), Keyes, IV et al.
patent: 4577270 (1986-03-01), Sugano et al.
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Favors Edward G.
Feldman Alfred N.
Honeywell Inc.
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