Standard Technical Features of BTG System for Supercritical 660 ...

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Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Unitsinputs/outputs like analog (4-20 mA DC, thermocouple, RTD), binary,pulse, etc. The inputs which are required for only information andmonitoring purposes shall be distributed suitably in various groups of themeasurement system.i) The control system shall be broadly divided into SG- C&I, TG- C&I andBOP- C&I.a) The SG- C&I part of DDCMIS system shall perform the followingfunction as minimum but not limited to:1. Burner management system (BMS) including control &protection of coal mills, fuel oil system etc.2. Analog control functions pertaining to separator drain control,secondary air damper control, auxiliary pressure reducing &desuperheating station (PRDS) pressure and temperature control.3. Soot blower control.b) The TG- C&I part of DDCMIS system shall perform the followingfunctions:1. Turbine protection system function (TPS).2. Turbine governing system for main turbine.3. Automatic turbine run up system. (ATRS).4. Automatic turbine testing (ATT).5. Turbine stress control system (TSCS).6. HP&LP bypass control system (HP bypass control system maybe alternatively implemented in SG- C&I part of the DDCMIS).7. Electro-hydraulic governing system for BFP turbine.8. Turbine generator control system.The turbine protection system and electro- hydraulic governingsystem may be implemented as part of standard practice of theturbine manufacturer.c) The BOP- C&I system shall perform the following functions:1. Analog control functions other than those covered in SG-C&Iand TG-C&I like co-ordinated master control, furnace draftcontrol, SH/RH steam temperature control, feed water flowcontrol, heaters/ deaerator/ condenser level control etc.146
Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Units2. Binary control functions pertaining to main plant auxiliaries likeFD/ ID/ PA fans, APH, BFP etc., generator auxiliary systems andelectrical breakers etc. The generator auxiliary system canalternatively be implemented in TG C&I as per standard andproven practice of the OEM.ii)SG C&IBurner Management System (BMS)a) Fully proven microprocessor based system, based on hardware andsoftware proven for burner management application shall beprovided to achieve the boiler protection e.g. master fuel trip (MFT),control of mills & fuel oil systems etc. The BMS shall meet allapplicable relevant safety requirements including those stipulated inlatest editions of NFPA 85. The MFT subgroup of BMS shall complywith relevant requirements of EN 50156, IEC 61508/ 61511.b) The BMS shall be provided with automatic self monitoring facility.All modules to be used in this system shall be of fail safe design.Any single fault in any primary sensor, I/O modules, multifunctioncontrollers, power supplies, cables etc. should not result in loss ofsafety function. All faults should be annunciated to the operator,right at the time of its occurrence.c) The MFT functions shall be implemented in a true triple modularredundant (TMR) configuration i.e. each of the three channels shallhave its own dedicated processors, controllers, communication, I/Omodules, interface etc. All safety related process inputs shall be fedto each of the 3 channels. All the primary sensors for unit/boilerprotection shall be triple redundant. The TMR system shall be SILcompliant.d) The acquisition and conditioning of binary and analog protectioncriteria signals for MFT shall be carried out in each of the three tripleredundant channels. Each channel shall compute the 2 out of 3 votinglogic and issue a trip command. The trip signals of the three channelsshall be fed to a fail safe 2 out of 3 relay tripping unit for each drive.The protection criteria for tripping shall be executed by a programwhich shall be identical in each of the triple redundant channel. Thecheck back contact signals of each relay of the 2 out of 3 relaytripping unit shall be fed back to each of the triple redundantchannels and shall be continuously monitored for equivalence in eachof them.e) The BMS shall be designed to:1. Prevent any fuel firing unless a satisfactory purge sequence hasfirst been completed.147
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