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 Units17.3.5 Acoustic pyrometers (if applicable as per OEM practice)i) Acoustic pyrometers are to be provided to determine the average fluegas temperatures and complete flue gas temperature profile at furnaceexit plane (for FEGT measurements) and at economiser outlet.ii)iii)iv)For each temperature measurement plan/section, a PC based systemcomplete with all required software, comprising of minimum eight nos.of acoustic transreceivers, signal processor, interface unit, PC & colourInkjet printer (common for one unit) shall be provided. The systemshall be able to eliminate the varying high noise environment both inand out of an operating boiler.The transit time of each of the associated transmitters/receivers shall betransmitted to the central processing unit (to be located at CER) forstorage and analysis through suitable interface device. A temperatureprofile shall then be determined and displayed by analysing the meantemperature across every transit section using deconvolution technique.The time interval to take a complete cycle of eight transceivers shall beless than one minute.The measuring range shall be sufficient to cover the entire regime ofboiler operation and shall not be less than 1900°C. The meantemperature and profile temperature accuracy shall be ± 2%, and ± 4%of reading respectively or better. Full colour VDU display and colourprinter output shall be provided. The system shall also provide 4-20mADC output for SG -C&I and BOP- C&I part of DDCMIS.v) The transducers shall not be placed directly in the hot gas stream. Thesystem shall be of proven design and it's performance must be provenusing similar type of fuel. The components to be located at boiler areashall be able to withstand the stringent environmental conditionexpected at such locations with operating boiler.17.3.6 Mill and air heater fire detection systemi) Adequate number of thermocouples type fire detection system for eachmill and air heater shall be provided as a composite and complete unitswith all required signals and accessories with adequate redundancy.ii)The controls & protection required for the mill fire detection systemshall be implemented in the SG-C&I and air heater fire detectionsystem shall be implemented in the BOP -C&I Part of DDCMIS usingrate-of-rise algorithm as per manufacturer's recommendation.164
Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Units17.3.7 Flame viewing systemi) The boiler shall be provided with a flame viewing system. The flamecameras shall be suitable for direct online continuous viewing in thecentral control room of the coal and oil flame. The numbers of flamecameras to be provided shall be appropriate as per boiler design subjectto minimum of two (2) numbers for each boiler.The facilities/ components of flame camera system shall, as aminimum, consist of 19" high resolution color monitor with facility forzooming and adjustment of iris from the monitor, all necessary remote/local programming tool, proper cooling arrangement (preferably air)and protection against cooling medium failure.ii)The cameras and the total system shall be suitable for the fuel beingfired considering the ash content of worst coal. The cameras shall beable to withstand the temperature expected in the furnace but shall notbe less than 1600 0 C.iii) The viewing angle of the camera shall be commensurate with thefurnace size, the camera location and the positioning of the burners.The system shall conform to PAL and number of TV lines shall beadequate for a clear image of the furnace.iv)The offered flame camera system shall have a record of trouble freeperformance of minimum one (1) year in a coal-fired boiler of size 500MW or above where the firing arrangement is similar to the offeredboiler.17.3.8 Separator vessel/ drain level control and monitoring systemThe system shall comprise of triple redundant electronics transmitters forseparator level and pressure measurements along with all the required controlvalves & actuators & other accessories. Atleast eight (8) Nos. thermocouplesshall be provided for separator metal temperature measurements. Further, ifthe separator materials call for stress evaluation of separator, the provisionfor same shall also be provided.17.3.9 Acoustic steam leak detection (ASLD) systemi) PC based Acoustic Steam Leak Detection system shall be providedwith Air Borne Sensors including all Signal amplifiers, calibrators,signal processing hardware and software, power supply distributioncables, Instrumentation cables for the entire system including specialcables. junction boxes, all erection hardware etc. Minimum thirty (30)number sensors shall be provided. It shall be possible to performcalibration of sensors without disconnecting the sensor.165
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Standard Technical Features of BTG System for Supercritical 660 ...

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