31 9800 9073 e 2005 03

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 BOGE POWER GENERATION DRAWING TITLE : System Description Pneumatic 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 Pneumatic System Dienstst./Dept P415 UNID 423217085 XS00 MBX98 Zähl.-Nr Reg.-No Index/Rev 355025 Version A Blatt-Nr./Page-No CM1-L1-M-MBX98.08-355025 Erstellt mit/designed with Ersatz für Supersedes of Gas Turbine Description of Auxiliary Systems Pneumatic Control Equipment Pneumatic System Refer also to: List of Control Settings (SREL) List of Measuring Instruments List of Electrical Loads Equipment List P+I Diagram, Pneumatic Valves and Piping 3.1-0210 3.1-0220 3.1-0230 3.1-0240 3.1-9810 Settings, limits, and measuring ranges of the devices referred to here are given in the List of Measuring Instruments, Equipment List, and List of Control Settings (SREL) The values stated in this description are only given as examples 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 Description Compressed air is the working medium used by the pneumatic actuators of various components in the gas turbine auxiliary systems As a rule, these pneumaticallyactuated valves are relevant to safety For safety reasons, the supply of compressed air to the gas turbine is therefore independent of the power plant compressed air network and is generated by a pneumatic station Optionally, valves in other systems can be supplied in addition to the blowoff valves In such cases, this information is depicted in the corresponding P+I diagrams Configuration and Function of Compressor Train The compressed air station is equipped with two redundant trains Each train essentially comprises a compressor, a cooler, and a filter The system has full redundancy, i.e., the capacity of each compressor train is sufficient to ensure a reliable supply of control air to the auxiliary systems (2x100%) The two trains have an identical configuration, for this reason only one train is described in the following Electrically-driven compressor MBX21AN001 compresses air Filter MBX21AT001 prefilters the air as it is drawn into the system Relief valve MBX21AA191 protects the compressor against excessive pressure Class: RESTRICTED Solenoid-type pressure relief valve MBX21AA501 is installed downstream of the compressors to prevent the reciprocating compressors from having to start up against pressure (startup assistance) This solenoid valve is open when the associated compressor is at standstill and is closed after the compressor is switched on The escaping compressed air and any condensation that forms are fed into condensation collecting tank MBX23BB001 The condensation collecting tank is equipped with silencer MBX23BS001 to reduce noise when discharging compressed air to the atmosphere Siemens AG Power Generation Condensation that accumulates in the condensation collecting tank is then fed to disposal tank MBX23BB002 that is at atmospheric pressure Because the condensation may contain oil, its disposal must comply with requirements that apply to used oil Swing check valve MBX21AA201 prevents venting of the train when the compressor is shut down Compressed air is dried in the next step Compressed air is cooled in chiller-type compressed air drier MBX22AT001 Moisture condenses, thereby bringing the air to the prescribed dew point pressure The separator system in the cooler separates water and oil from the stream of compressed air Condensation is removed via drain MBX22AT011 Any dirt particles or oil droplets still present in the compressed air are removed by filter MBX22AT003 An optical differential pressure indicator equipped with differential pressure switch MBX22CP001 is provided at the filter A group fault alarm is annunciated if the differential pressure setting of this switch is violated (cf subsection “Monitoring”) Then the filter element must be replaced Condensation is removed via drain MBX22AT013 Shutoff valve MBX22AA251 can be used to isolate the train for maintenance purposes, even during plant operation The two trains merge downstream of the shutoff valve Swing check valve MBX23AA201 prevents the escape of large volumes of air from the tank if there is a leak in one of the trains Compressed air tank MBX24BB001 is used to store the compressed air after it has been dried and cleaned Pressure control valve MBX24AA151 maintains system pressure even during extended outages and in the case of minor leaks It only opens if pressure in the tank exceeds the startup pressure of the compressors Orifice MBX24BP001 ensures that only a very small flow or air can be returned even in the event the pressure control valve malfunctions Tank pressure can be read off gauge MBX24CP501 System pressure is limited by safety valve MBX24AA191 Shutoff valve MBX24AA401 can be used as necessary to check whether condensation has formed in the tank Open-loop Control The open-loop control system for the pneumatic station constitutes a black box for the gas turbine I&C system Once the pneumatic station has been started up by manually actuating the main power switch, no further 3.1-9800-9073/1 0305E-X Gas Turbine Description of Auxiliary Systems switching actions on the part of the gas turbine I&C system are required for control of the pneumatic station The open-loop control equipment and power supply for the electrical components are located in a separate junction box for each compressor train (MBY40GH001 and MBY40GH002 not shown) Each of the compressors is provided with a dedicated pressure switch (MBX24CP003 and MBX24CP004, respectively) for startup and shutdown These two switches have the same pressure setting The tank pressure is monitored by pressure switches MBX24CP001, MBX24CP002, and MBX24CP008 If tank pressure drops below the setting of pressure switch MBX24CP001, the pretrip alarm "PRESSURE LOW" is annunciated If pressure in the tank continues to decline, pressure switches MBX24CP002 and MBX24CP008 operate, gas turbine trip is triggered (2-of-3 logic gating), and the alarm message “Pressure TOO LOW” is annunciated The messages “Compressor ON” and “Compressor ON” are displayed on the operation and monitoring system If the compressors are in operation for extended periods, it can be assumed that the system is no longer leak-tight The pneumatic system, including all piping, must then be checked for leaks The alarms “Fault in train 1” and “Fault in train 2” are group fault alarms and are displayed on the operation and monitoring system If one of these alarms is annunciated, the affected compressor train must be shut down and serviced Potential causes include, for example: response of compressor circuit breaker, drier malfunction, condensation separator malfunction, startup assistance solenoid valve NOT CLOSED, response of filter differential pressure switch, loss of power supply 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 Monitoring Pneumatic Control Equipment Pneumatic System Siemens AG Power Generation 3.1-9800-9073/2 0305E-X ... chiller-type compressed air drier MBX22AT001 Moisture condenses, thereby bringing the air to the prescribed dew point pressure The separator system in the cooler separates water and oil from the... can be returned even in the event the pressure control valve malfunctions Tank pressure can be read off gauge MBX24CP501 System pressure is limited by safety valve MBX24AA191 Shutoff valve MBX24AA401... purposes, even during plant operation The two trains merge downstream of the shutoff valve Swing check valve MBX23AA201 prevents the escape of large volumes of air from the tank if there is a leak