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- W120576278 abstract "Syncrude Canada Ltd., Fort McMurray, Alberta, Canada, mines and processes tar sand to produce 130,000 barrels/day of synthetic crude oil. Its utility plant can supply over 2400 kilo lb/hr of 900 lb/sq inch gauge steam and generate over 200 MW of electrical power. Without a continuous supply of stable 900-psig steam, a total plant shutdown occurs: two fluid coking units must be turned around and 50 days of production (over 6 million barrels) are lost. During Syncrude's seven years of operation, the plant has shut down a number of times. During the initial stages of plant design, its was found that a boiler trip with two remaining utility boilers on most control would result in header decay from 915 to 800 psig in 100 seconds. This occurred with the limiters cut in but with no operator intervention to reduce the load. Management demanded an off-the-shelf solution that could be quickly implemented. They preferred raise/lower action through the existing, 125-VDC turbine speeder gear motors which act as the shed control interface. The tie-line controller and raise/lower manual hand switches also operated in conjunction with the speeder gears. Finally, management decided not to add more indicators, switches, lights, and diagnostics to themore » already crowded control panel. A programmable controller with a graphics CRT interface seemed to be suitable for Syncrude's requirements. Specifications were generated for the project. Because of its flexibility and expansion capabilities, the programmable controller and CRT operator interface now smoothly cut back steam demand when a boiler trips and reload the steam turbines if an increase in steam pressure occurs. The steam load shedding system was commissioned in 1984 and has performed well to date.« less" @default.
- W120576278 created "2016-06-24" @default.
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- W120576278 date "1985-10-01" @default.
- W120576278 modified "2023-09-23" @default.
- W120576278 title "Stable, 900 psig steam supply ensured with controller" @default.
- W120576278 hasPublicationYear "1985" @default.
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