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 Units21.3.6 Alkali preparation/ dosing systemOne no. alkali preparation/ dosing tank of minimum 500 litre capacity shall beprovided for gravity feed of alkali solution to overhead DM tank and suctionpiping of ECW system. The tank shall be of MSRL/ stainless steelconstruction with SS 316 basket, SS 316 agitator with gear reducer unit andother accessories. Alternatively, dosing system may comprise of one no. alkalipreparation/ dosing tank alongwith 2x100% dosing pumps in SS 316construction for dosing of alkali solution at suction of DMCW pumps.21.3.7 PipingPiping up to & including 150 NB shall be MS ERW as per IS 1239 (HeavyGrade) and piping above 150 NB shall be fabricated from minimum 6mmthick MS plates as per IS 2062 rolled and welded confirming to IS 3589.21.4 Sizing Criteria21.4.1 Pumpsi) Design flow of pump shall be taken as equipment/process requirementplus 10% margin.ii) Design head shall be calculated as per system requirement with 10%margin considered in piping friction head.iii) The pump shall be capable of supplying process flow requirement at47.5 Hz frequency of power supply.iv)Continuous rating of the motor at 50 0 C ambient temperature shall haveminimum 10% margin over the maximum power requirement of thepump in its entire characteristic curve.21.4.2 Plate type heat exchangersi) Plate heat exchangers shall be designed considering secondary inletwater temperature as 36 0 C 1 and a terminal temperature difference (TTD)of maximum 3 0 C. As such, primary outlet water temperature shall bemaximum 39 0 C 2 .ii)The temperature rise of secondary cooling water in no case shall exceedthe temperature rise of cooling water in the condenser.iii) Overall fouling factor shall be considered as minimum 0.8x10 -4 hr m 2deg C/kcal.1 33 0 C for sea water based once- through type CW system.2 36 0 C for sea water based once- through type CW system.193
Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal UnitsCHAPTER- 22.CONDENSATE POLISHING PLANT22.1 GeneralThe Condensate polishing Plant shall consist of one set of Condensatepolishing Units (CPU) for each TG unit and a common external regenerationsystem. The CPU for each 660 MW unit shall consist of 3x50% capacityservice vessels (4x33.3% for 800 MW unit size).22.2 Salient Design Datai) The design flow (through working vessels) for each condensate polishingunit shall be as per condensate flow corresponding to TG output atVWO with 1% make up and design condenser pressure.ii)The following dissolved solids concentration and conditions shall beused as a basis of design for the condensate polishing system (the ionicconcentrations indicated below are as such):Description Influent Effluenta) Ammonia ppb 100 --b) Total dissolved solids (excluding100 20ammonia), ppbc) Silica, ppb 30 5d) Iron, ppb 50 5e) Sodium, ppb 10 2f) Chloride, ppb 10 2g) pH 8 – 9.3 --h) Effluent conductivity after removal -- 0.1 or lessof ammonia and amines (micromhos/cm) at 25 0 C.i) Suspended solids (crud), ppb 25 5Under the above operating and design flow through the polisher units,the service run of the vessels shall be minimum 15 days (360 hrs). Themode of CPU operation during this period shall be either in hydrogencycle or a combination of hydrogen and ammonia cycle maintaining theabove effluent quality. Whenever specific conductivity starts increasingfrom 0.1 micro mhos/cm in the effluent, it shall deemed that “ammoniabreak point” has reached and ammonia cycle has commenced.194
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Standard Technical Features of BTG System for Supercritical 660 ...

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