DRAWING/DOCUMENT STATUS A FOR REFERENCE 2006-04-10 First issue Steenmeyer DATE DESCRIPTION Bearb Coord Rev Liedtke Sudhoff Geprüft Checked APPD PROJECT : CAMAU 750MW COMBINED CYCLE POWER PLANT OWNER : OWNER’S ENGINEER : PETRO VIETNAM CPMB CONTRACTOR : CONTRACTOR’S ENGINEER : LILAMA CORPORATION FICHTNER SUBCONTRACTOR’S NAME : SUBCONTRACTOR’S SUPPLIER : s MCE POWER GENERATION DRAWING TITLE : System Description Drainage System PKZ UAS Contents Code Ursprung/Original Reg No UNID Urspr.-PKZ-Nr Orig.-PC Ursprung-Nr./Original-No Projekt/Project gezeich Drawn bearb Coord geprüft Checked Abtlg Dept PKZ/PC Datum Date Name 06-04-10 STEENM 06-04-10 LIEDTKE 06-04-10 SUDHOFF P415 sgd s AG POWER GENERATION CA MAU CCPP VIT154 Maßstab Scale UA/DCC Type Inhaltskennzeichen Contents Code N/A A4 Benennung/Title System Description Drainage System Dienstst./Dept P415 UNID 423217016 XS00 MBA Zähl.-Nr Reg.-No Index/Rev 355018 Version A Blatt-Nr./Page-No CM1-L1-M-MBA.08-355018 Erstellt mit/designed with of Ersatz für Supersedes Gas Turbine Description of Auxiliary Systems Compressor and Turbine / GT Bearings Drainage System Refer also to: List of Control Settings (SREL) List of Electrical Loads Equipment List P+I Diagram, Drainage System P+I Diagram, Blowoff System P+I Diagram, Turbine Cooling Configuration 3.1-0210 3.1-0230 3.1-0240 3.1-1210 3.1-1410 3.1-2010 Cleaning fluid is drained off at the following gas turbine locations: No 21 22 23 24 25 26 Settings, limits and measuring ranges of the devices listed here are given in the List of Measuring Instruments, Equipment List and List of Control Settings (SREL) This description only gives guideline values The reproduction, transmission or use of this document or its content is not permitted without express written authority Offenders will be liable for damages All rights, including rights created by patent grant or registration of a utility model or design, are reserved Functions Cleaning fluid sprayed into the compressor during the cleaning operation collects at several locations in the gas turbine This fluid is removed via the drainage system before the gas turbine is restarted Danger! Risk of scalding! The compressor cleaning operation and also the subsequent draining operation are performed manually I.e the switches and valves must be operated by hand It is absolutely imperative that all the valves opened during the draining operation be closed once draining has been completed If they are not closed, hot gases will escape from the drainage piping and equipment may be damaged or persons injured In addition, crosscurrent flow may occur between the individual gas turbine drain connections Gas Turbine Location Compressor stage Compressor stage Compressor stage 13 Compressor outlet Turbine stage Turbine stage Turbine stage Extraction ring E1/A1 stage Compressor stage blowoff line Compressor stage blowoff line Compressor stage cooling air line Compressor stage cooling air line Compressor stage 13 cooling air line Compressor stage 13 cooling air line Pipes connect these locations to header MBA25BB001 The shutoff valves in these lines must be opened manually to drain cleaning fluid and then closed after completion of draining Cleaning fluid must be routed from header MBA25BB001 via connection 30A and a hose line to a disposal tank, the latter of which must be supplied locally The header only has a small volume and therefore cannot function as a collecting vessel For this reason it must be ensured that the cleaning fluid can freely flow from the header into a disposal tank at all times A venting nozzle prevents the buildup of pressure in the collecting tank When cleaning the compressor, some of the cleaning fluid flows to the lowest point of the compressor intake structure which is not depicted in the P+ID This lowest point is connected to the disposal tank via a duct which has no shutoff valve Instead the duct contains a hydraulic seal which must be filled with water before the gas turbine is started up During operation of the gas turbine this hydraulic seal prevents the subatmospheric pressure that prevails upstream of the compressor from drawing air in the disposal tank into the compressor Class: RESTRICTED The shutoff valves of the blowoff system drains and also those of the turbine cooling system drains are depicted in the drainage system P+ID Siemens AG Power Generation 3.1-1200-9070/1 MBA/MBO 1203E-X Gas Turbine Description of Auxiliary Systems Compressor and Turbine / GT Bearings Drainage System Fuel Oil Drainage System When the gas turbine is started on liquid fuel (fuel oil), the latter is injected into the combustion chamber during the ignition phase In the event that the flames not ignite immediately on startup with fuel oil⎯or if they initially light and then extinguish⎯fuel oil may precipitate on the combustion chamber walls This uncombusted fuel oil must be drained off before the gas turbine is restarted Draining is achieved via the same pipe connection at the compressor outlet that is used to drain the spent cleaning fluid after cleaning the turbine or compressor These solenoid valves remain in their drainage settings during standstills or turning gear operation to allow any uncombusted oil that collects to drain off For this purpose, these two solenoid valves are always actuated to their oil drainage setting at speeds below S.TURB.05 (for example 5% rated speed) 3-way valve MBA22AA001 then has the setting “A-C open; B closed” and solenoid valve MBA22AA002 is open Solenoid valve MBA22AA002 is closed in one of the first steps of the fuel-independent startup program During a start with fuel oil, the 3-way valve is actuated such that the fuel oil drain is open (A-C open; B closed) as it cannot be ascertained in advance whether the start will be successful or aborted These solenoid valve settings ensure that any fuel oil which may collect does not enter the water drainage system and no hot air can escape from the fuel oil drainage system In the case of a fault-free start, the 3-way valve is actuated to its drain setting “A-B open; C closed” when flames are detected in the combustion Fuel oil is injected without formation of flames If this type of failed start occurs, the absence of a signal from the flame monitor keeps the 3-way valve in its fuel oil drainage setting Fuel oil is injected, flames initially form, however they subsequently extinguish This type of failed start is always followed by GT trip When flames extinguish, the 3-way valve receives the signal “Flame out” from the flame monitor and is returned to the fuel oil drainage setting Each time the gas turbine is shut down, including after failed starts, both solenoid valves are energized, i.e actuated to their oil drainage settings, when speed drops below S.TURB.21 (for example 25% rated speed) After a failed start, oil flows via connection 111A into the used oil disposal tank At speeds below S.TURB.21 it is ensured that pressure does not become excessive when draining oil from the combustion chamber and thus that oil and air cannot flow into the leakage oil tank at an impermissibly high velocity To ensure that all uncombusted oil collecting after a failed start has sufficient time to drain out of the combustion chamber, it is not possible to restart the gas turbine until monitoring period K.ENTOEL.01 (for example minutes) has elapsed Wastewater that accumulates during compressor cleaning must be drained off To this, solenoid valves MBA22AA001 and MBA22AA002 must be manually actuated to their drain settings At speeds below S.TURB.05 (for example 5% rated speed) these solenoid valves can be actuated manually These solenoid valves are equipped with limit switches If none of the solenoid valves are in the drain setting during operation at high speed (>S.TURB.21) the protection system alarm “Fuel oil drainage valve not closed” is issued and overall trip is triggered Class: RESTRICTED The reproduction, transmission or use of this document or its content is not permitted without express written authority Offenders will be liable for damages All rights, including rights created by patent grant or registration of a utility model or design, are reserved Three-way solenoid valve MBA22AA001 is used to route fluid from this drain, either to shutoff valve MBA22AA251 or to a drain pipe equipped with solenoid valve MBA22AA002 The fuel oil must be fed from connection 111A into a disposal tank for used oil (supplied locally) This tank must have provision for continuous venting since air can also escape at connection 111A chamber A distinction is made between two types of failed start: Siemens AG Power Generation 3.1-1200-9070/2 MBA/MBO 1203E-X ... cannot be ascertained in advance whether the start will be successful or aborted These solenoid valve settings ensure that any fuel oil which may collect does not enter the water drainage system and... actuated to their drain settings At speeds below S.TURB.05 (for example 5% rated speed) these solenoid valves can be actuated manually These solenoid valves are equipped with limit switches If none... is achieved via the same pipe connection at the compressor outlet that is used to drain the spent cleaning fluid after cleaning the turbine or compressor These solenoid valves remain in their drainage