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 Unitsb) Either 2x50% capacity control valves or 1x100% control valve shallbe provided to achieve proper control under all operating conditions.The control valve(s) shall be able to bypass requisite percentage ofrated flow as per any number of the operating service vessels beingout of service.iv)Resin Transfer Pipinga) Piping system shall be provided for hydraulic/ hydropneumatictransfer of exhausted/ regenerated resin between service vessels andregeneration area. The resin transfer pipeline shall be of stainlesssteel type 304 and sized for a flow velocity of between 2 and 3 m/s.b) The length of resin transfer piping shall generally not exceed 300m.The arrangement shall avoid any sharp bends which causesegregation of the mixed resins, and pockets where the resins canget trapped. Suitable observation ports shall be provided in allcritical areas to enable for monitoring the resin transfer operations.22.4 System Requirements for External Regeneration Facilityi) Regeneration Systema) The regeneration system shall be external and common to the plant.Under normal conditions, it will hold a complete charge of freshlyregenerated and mixed resin, ready for use, in its storage tank. Forregeneration, resin from the exhausted exchanger vessel will betransferred hydraulically or hydropneumatically to this facility. Theempty exchanger vessel will then be filled up with the alreadyregenerated resin and shall come into service soon after perquisitecondition is satisfied or as and when desired by the operator. In themeantime, the exhausted resin shall be cleaned, separated,regenerated, mixed and rinsed before being stored for next use.Demineralized water shall be used throughout the regenerationprocess for backwashing, regenerant diluent, rinsing and resintransfer.b) Two nos. resin separation/ regeneration vessels and one no. mixedresin vessel shall be provided alongwith all internals, fittings andappurtenances for these vessels. An additional vessel containing onespare charge of mixed resin shall also be provided which shall beinterconnected to the separation/ mixed vessel.c) Resin injection hopper, complete with a water ejector system shall beprovided for resin make-up to the resin separation/ regenerationvessel. The system shall be sized to handle upto 150 liters of asreceived new resins per single injection.197
Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Unitsd) 2x100% capacity DM water pumps shall be provided for watersupply for chemical preparation/dosing and transfer of resin fromservice vessel to regenerating vessels and vice versa. The pumpsshall be horizontal centrifugal type and conform to IS: 1520/IS: 5120or equivalent without any negative tolerance. All wetted parts of thepump shall be of CF-8M.ii)Vessel Free BoardThe pressure vessels in the common external regeneration facility shallbe provided with adequate freeboards over the top of the settled resins, tominimize resin loss during regeneration. Minimum freeboards to beprovided shall be as below:a) Mixed resin Storage vessel : 50%b) Resin separation vessel : 75%c) Cation regeneration vessel : 75%d) Anion regeneration vessel : 75%iii)Chemical Dosing Systema) 2x100% capacity hydraulically operated ejectors or metering pumpsshall be provided each for dosing of acid and alkali. Material ofconstruction shall be suitable for liquid being handled.b) Acid ejectors/ metering pumps shall take suction from 2x100% acidmeasuring tanks and alkali ejectors/ metering pumps from 2x100%alkali day tanks. The capacity of tanks shall be atleast 20% higherthan that required from process calculations.c) For heating of alkali diluent water, 2x50% electrical heating coil in aMSRL tank shall be provided. The capacity of tank shall beminimum 20% higher than the maximum water demand. The heatersshall be sized for heating the water from 15 0 C to 45 0 C within a timeperiod not more than 5 hours.d) Complete system for off-stream ammoniation of the resins, usingammonium hydroxide, shall be provided, if felt necessary, to meetthe system requirements.iv)Bulk Acid and Alkali Storage Tanks and Unloading Pumpsa) The bulk acid & alkali storage tanks shall be horizontal, dished ends,cylindrical type as per BS EN 12285 or equivalent standard. Thesetanks shall be of mild steel construction with inside surface rubberlined to 4.5 mm thickness in three layers.198
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Standard Technical Features of BTG System for Supercritical 660 ...

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