El Segundo Energy Center Fast Start Experience Combined Cycle Users Conference September 4, 2013 El Segundo Energy Center Fast Start Experience
Overview • Plant Design – Variations from conventional CC & unique Fast Start Features • Construction/ Commissioning Experience • Key Influences El Segundo Energy Center Fast Start Experience September 18, 2013 1
Definitions • Fast Start Definition: Time from “Start Initiation” to “Ready for unit operation in AGC mode” Important considerations: —Downtime interval – hot, warm, cold —Permissives —Unit Authority communications • Non-Spin Reserve Definition: Amount of Net Generation at Point of Delivery within 10 min El Segundo Energy Center Fast Start Experience September 18, 2013 2
Single-pressure Non-Reheat HRSG SGT6-5000F (w/ conventional SCR & CO catalyst) GT Exhaust HP Steam Feedwater SST-800 backpressure industrial ST Air Cooled Heat Exchanger Steam Condenser Backpressure (Positive Pressure) El Segundo Energy Center Fast Start Experience September 18, 2013 3
Fast Start Design Features • CT load ramp capability/ optimization • Fast ST Start-up mode – ST stress controller • Piping warm-up strategies • High-Capacity attemperators • Fast Start HRSG HP Section technology • Permissive requirements • Air purge credits • By-pass System El Segundo Energy Center Fast Start Experience September 18, 2013 4
Construction/ Commissioning / Testing • Design issues • QA/ QC during design/ construction to accommodate large temperature transients • Component testing • Commissioning process • Performance testing El Segundo Energy Center Fast Start Experience September 18, 2013 5
Key Influences • 10 min “non-spin reserve” period —Start Permissives, Attainment of purge credit —Controls • Steam Turbine and warm-up and attainment of AGC condition —ST Stress Controller – Bypass operation —Controls —Valve Tuning/ Operation El Segundo Energy Center Fast Start Experience September 18, 2013 6
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