منتدى الهندسة الكهربية

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-   -   Boiler , turbine - control modes (https://www.ieees.com/f-3/3056/)

Khaled Hamza 12-21-2010 04:43 PM

Boiler , turbine - control modes
 
[LEFT]

[U][F**T=Impact]Boiler Master (Firing Rate Demand)[/F**T][/U]

[B][I]Boiler Master (basic firing rate demand) computati** is dependent ** the Current operating mode like [/I][/B]
[B][I][U][F**T=Georgia]Coordinated mode[/F**T][/U][/I][/B][B][I], [/I][/B]
[B][I][U][F**T=Georgia]Boiler Follow mode, [/F**T][/U][/I][/B]
[B][I][U][F**T=Georgia]Turbine Follow mode[/F**T][/U][/I][/B][B][I],[/I][/B]
[B][I][U][F**T=Georgia]Manual mode.[/F**T][/U][/I][/B][B][I][/I][/B]
[B][I]This demand is transmitted in parallel to the [U]fuel and air c**trol sub -loops.[/U][/I][/B]


[U][F**T=Impact](1) Unit Startup[/F**T][/U]
[B][I]During the unit startup, [U]Boiler Master[/U] is determined as a fixed demand with the rate to obtain the optimum boiler steam temperature rising and steam flow until [U]HP turbine bypass c**trol valve[/U] is [U]fully closed[/U]. This demand will be adjusted manually or automatically according to the unit startup mode. [/I][/B]
[B][I]During this period, [U]Main steam pressure[/U] is c**trolled by [U]HP turbine bypass c**trol valve[/U]. During the unit start up, the operating mode will be [U]Manual Mode[/U] both [U]Turbine governor[/U] and [U]Boiler Master manual[/U].[/I][/B]




[U][F**T=Impact](2) Normal operati**[/F**T][/U]
[B][I][U][/U][/I][/B]
[B][I][U] [/U][/I][/B]
[B][I]After [U]HP turbine bypass c**trol valve[/U] is [U]fully closed[/U], the operating mode will be normally transferred to [U]Coordinated C**trol Mode[/U].[/I][/B]
[B][I]In case of [U]Coordinated C**trol Mode[/U], the [U]turbine governor[/U] c**trols [U]MW[/U] and [U]Boiler Master[/U] c**trols the [U]main steam pressure[/U]. [/I][/B]
[B][I]In case of [U]Boiler Follow Mode[/U], [U]Boiler Master[/U] also c**trols the [U]main steam pressure[/U].[/I][/B]
[B][I]In case of [U]Boiler Master Manual[/U] or [U]load runback[/U], the operating mode becomes [U]Turbine Follow Mode[/U] and [U]turbine governor[/U] c**trols the [U]main steam pressure[/U].[/I][/B]

[URL="http://1.bp.blogspot.com/_CZnqYQLLQtc/TRDWXgBfULI/AAAAAAAAADQ/L_Z877BIY_U/s1600/HPTV.JPG"][IMG]http://1.bp.blogspot.com/_CZnqYQLLQtc/TRDWXgBfULI/AAAAAAAAADQ/L_Z877BIY_U/s640/HPTV.JPG[/IMG][/URL]


[/LEFT]

bigleve2100 08-12-2011 06:13 AM

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