Liquid heaters and vaporizers – Circulation – With start-up operations
Patent
1987-11-04
1989-06-27
Warner, Steven E.
Liquid heaters and vaporizers
Circulation
With start-up operations
122448R, 1224512, 122452, F22D 700
Patent
active
048419184
ABSTRACT:
A boiler control system includes a first device for measuring or computing a rate of change in steam temperature and a generated thermal stress in a pressure part of a boiler, and a second device for controlling steam temperature or a rate of change in the steam temperature at the pressure part of the boiler in accordance with a desired value, and a third device which has functions for storing in a memory combinations of the steam temperature and the thermal stress at each moment as obtained by the first device. The third device determining, from the combinations stored in the memory, a relationship between a steam temperature changing rate and a maximum thermal stress caused by the steam temperature chaning rate, determines, in accordance with the relationship, a steam temperature changing rate limit value necessary for maintaining an actual thermal stress in the pressure part of the boiler below a maximum thermal stress limit value which is predetermined beforehand or which is given for each start-up of the boiler, and delivers the steam temperature changing rate limit value or desired steam temperature value obtained by integrating the steam temperature changing rate limit value to the second device as the desired value.
REFERENCES:
patent: 3532079 (1970-10-01), Chambert
patent: 3828737 (1974-08-01), Fujii et al.
patent: 4262636 (1981-04-01), Augsburger
patent: 4637348 (1987-01-01), Fukayama
Fukayama Yukio
Kuramoto Atsushi
Babcock-Hitachi Kabushiki Kaisha
Warner Steven E.
LandOfFree
Boiler control system does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Boiler control system, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Boiler control system will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-805079