Control of a cracking furnace

Details Control of a cracking furnace Control of a cracking furnace

1979-05-02

1981-03-17

Ruggiero, Joseph F.

Boots, shoes, and leggings

208DIG1, 422110, 585501, 364106, 364116, G06F 1546, G06G 758

Patent

active

042571057

ABSTRACT:
The flow rate of a diluent fluid, such as steam, hydrogen or methane, to a cracking furnace is controlled so as to maintain a desired outlet velocity for the effluent flowing from the cracking furnace or to maintain a desired residence time for the feed stream in the cracking furnace. Feed forward control for the flow rate of the diluent fluid is provided by using an empirical model of the cracking furnace to predict either the outlet velocity or the residence time based on measured system parameters. Feedback control for the flow rate of the diluent fluid is provided by calculating the actual outlet velocity or actual residence time based on measured system parameters. The measured outlet velocity or residence time is utilized to bias or correct the predicted outlet velocity or residence time to provide a corrected prediction of the outlet or residence time. If control of the outlet velocity is desired, then the flow rate of the diluent fluid to the cracking furnace is manipulated in response to the corrected outlet velocity signal. If control of the residence time is desired, then the flow rate of the diluent fluid to the cracking furnace is controlled in response to the corrected residence time signal.

REFERENCES:
patent: 3175968 (1965-03-01), Berger
patent: 3473008 (1969-10-01), Bay et al.
patent: 3594559 (1971-07-01), Pemberton
patent: 3619360 (1971-11-01), Persik, Jr.
patent: 3758762 (1973-09-01), Littmann et al.
patent: 3824388 (1974-07-01), Cugini
patent: 3828171 (1974-08-01), Griffin

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