Exhaust Gas Attemperator (EGA)

Intern © Siemens AG 2014 Alle Rechte vorbehalten. Jan. 2015 / PG ES EN SFCS SG

Exhaust Gas Attemperator (EGA)

Jan. 2015

Intern © Siemens AG 2014 Alle Rechte vorbehalten.

Seite 2 Bauer / SFCS SG

Basic Requirements, external Partners

• GT upgrades leads partial to increased exhaust gas temperatures

• Part load ATK increase for GT operation with restrictive CO limits

• HRSG limits for duct system (design report)

External Partners: • TEC artec valves GmbH&Co. KG Oranienburg (supplier injection system) • CFX Berlin (CFD analysis)

Jan. 2015



System Overview

spray water for GT exhaust gas attemperators

Exhaust

Feed Water Pump

Heat Recovery Steam Generator Condensate Preheater

Main Condensate Pump

GT Exhaust Gas

attemperator cooling water return

attemperator cooling water supply

Spray Water Pumps

Option: Pressure

Regulator

8 spraywater attemperators

which are arranged in one cross section around the GT exhaust gas duct

M

to Aux. Cooling Water PGB DN25

0 – 0,2 kg/s

DN

15

DN

15

DN

15

DN

15

DN80

0 – 12 kg/s

DN40

0 – 1,5 kg/s

from Aux. Cooling Water PGB

Option: Pressurized Water Storage Tank DN40

0 – 1,5 kg/s Option: Safety

Valve

DN25

0 – 0,2 kg/s

M

M

M

GHC

Jan. 2015



General Data for Attemperator Design and Check of Capacity of involved Components

Design Data Attemperator: Deionat consumption base load, dt = 30 K m = 5,9 kg/s - „ - part load, dt = 30 K m = 3,6 kg/s - „ - „Cold Start stationary conditions“ m = 6 - 8 kg/s Design Value m = 12 kg/s p min deionat (according to manufacturer) p = 20 bar pump design dp = 30 bar Main involved BoP Components: Deionat Production System Capacity (GC) m = 2 x 1,11 kg/s Deionat Storage Tank (GHC) V = 600 m³

Jan. 2015



Arrangement of Components and Systems

Jan. 2015



CFD Analysis

Different Parameters to be checked: • Number of injection points • Distance of injection point to inliner plate • Droplet diameters • Spray angle and direction • Droplet velocity • Injection mass flow • Flue gas velocity and temperature distritution (GT) • Base load and part load conditions (GT)

Jan. 2015



Detailled Arrangemant of Attemperator Lances at Exhaust Gas Diffuser

Jan. 2015



Details of Attemperator Lances

Jan. 2015



Arrangement draft

Jan. 2015



Control Valve

Jan. 2015



Implementation Checklist

• Check of − Water consuption acceptable for customer? − Thermodynamik of HRSG (only for „cold start on the fly“ procedure) − Capacity of bypass stations (HP, IP,LP) (only for „cold start on the fly“ procedure) − Arrangement and routing of deionat system LCE90 and closed cooling water system PGB30/40 − Design parameter of deionat system (capacity of deionat production, storage, transporation system) − Evaluation of life time consumption of HRSG pressure parts (only for „fast cold start “ procedure)

• Engineering − Plant layout for additional systems and components − Routing for deionat and cooling water piping − Modification of GT diffuser (drilling, fittings) − Erection sequences − Ordering of components, piping, erection etc. − Commissioning − Testing

Jan. 2015



Main Business Case (Fast Cold Start Up GT)

P MW

Time

GT baseload or frequent operation

GT partload operation (IGV min)

Low partload operation of GT (TT2 390 C)

ST in operation

Additional electrical power output during start up procedure

35-45 min 2-2,5 h

ST warm up procedure

20

120

240

0

50

Exhaust Gas Attemperator (EGA)

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