Reduction in turbine/boiler thermal stress during bypass operati

Details Reduction in turbine/boiler thermal stress during bypass operati Reduction in turbine/boiler thermal stress during bypass operati

1994-02-14

1995-07-25

Lazarus, Ira S.

Power plants

Motive fluid energized by externally applied heat

Process of power production or system operation

60667, F01K 1302, F01D 1704

Patent

active

054351383

ABSTRACT:
A method of reducing turbine inlet temperature excursions during sudden load demand reductions on a steam turbine, the turbine being coupled to a controllable source of high pressure, high temperature steam, incorporates throttling of steam within the steam source in conjunction with steam throttling at the turbine so as to apportion temperature drops between the source and turbine. In one form, the method includes the steps of sensing a sudden drop in load demand on the steam turbine, operating the steam source to reduce exit pressure of the steam at the steam source and bypassing sufficient steam around the steam turbine to reduce steam flow through the turbine by an amount commensurate with the drop in load demand. The steam source may be controlled by adjusting division valves between primary and secondary superheaters in the steam source to throttle steam pressure at the secondary superheater and then heating the steam in the secondary superheater to a temperature which compensates for the temperature drop across the division valves caused by throttling.

REFERENCES:
patent: 3630839 (1971-12-01), Podolsky
patent: 4297848 (1981-11-01), Silvestri, Jr.
patent: 4408458 (1983-10-01), Torii
patent: 4576008 (1986-03-01), Silvestri, Jr.
patent: 4728254 (1988-03-01), Schmitz-Josten et al.
patent: 4862692 (1989-09-01), Fukuda et al.
patent: 4870823 (1989-10-01), Silvestri, Jr.
Technical Paper "Ten years experience with large pulverized coal-fired boilers for utility service" BR-1218 Babcock & Wilcox Presented to American Power Conference Chicago, Ill., Apr. 26-28, 1982.

Affiliated with

Also associated with

Rating

Reduction in turbine/boiler thermal stress during bypass operati does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Reduction in turbine/boiler thermal stress during bypass operati, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reduction in turbine/boiler thermal stress during bypass operati will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-732778