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) The requirement of tanks and unloading pumps shall be as below:1. Acid storage tanks 2 nos., total storage capacity to hold30- 33% HCl for 30 days (minimum)requirement of the plant or 30 m 3whichever is higher.2. Alkali storage tanks 2 nos., total storage capacity to hold48% NaOH for 30 days (minimum)requirement of the plant or 30 m 3whichever is higher.3. Acid unloading 2x100%, 10 m 3 /h each, Hastealloy-Bpumps4. Alkali unloadingpumpsv) DM Regeneration Water Tank(wetted parts)/ FRP/ PP construction.2x100%, 10 m 3 /h each, SS- 316construction.One (1) no. DM regeneration water tank of mild steel construction to IS2062 Gr- B with inside surface rubber lined to 4.5 mm thickness in threelayers or epoxy coated shall be provided. The capacity of the tank shallbe to hold 1.5 times the DM water required for one regenerationincluding resin transfer operations subject to minimum capacity of 500m 3 . 2x100% capacity pump taking suction from this tank shall beprovided for regeneration cum resin transfer operations.vi)Effluent Disposal SystemNeutralising pit shall be in two (2) sections of RCC construction withepoxy coating and each section shall have a holding capacity of 1.5 timesthe waste effluent from each regeneration. Three (3) nos. waste waterrecirculation/ disposal pumps of horizontal centrifugal type (rubber linedor SS- 316L construction) with priming arrangement shall be providedfor waste recirculation and disposal. Each pump shall be designed topump the waste effluent of one regeneration in less than three (3) hours.Proven agitation system like air agitation, venturi mixing etc. shall beprovided in addition to recirculation from pumps.Provision of dosing acid and alkali shall be provided to neutraliseeffluents before disposal.22.5 Control and Operation of Condensate Polishing Plant22.5.1 The complete control and operation of the CPU and regeneration plant shallbe through programmable logic controllers (PLC). The CPU shall becontrolled from the CPU control panel, located near the polishing vessels andshall be suitably interlocked with the regeneration system control panel. Asan alternative, single PLC can also be provided for control of CPU andregeneration system as per standard proven practice of the OEM.22.5.2 The CPU control panel shall clearly show the status of each service vessel.199
Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Units22.5.3 It shall be possible to operate the regeneration plant in auto/semi-auto/manual mode. In 'Auto' mode, once the sequence has been initiated, it shallproceed from step to step automatically. In 'Semi-auto' mode each step shallbe performed only after initiation by the operator. In ‘Manual’ mode,complete operation shall be by the operator by operation from the controlpanel. On PLC failure, it shall be possible to operate the valves by means ofmanual operation of solenoid valves also.22.5.4 It shall be possible to select each of the CPU vessels for any of the followingoperations from the CPU control panel:i) Service run.ii) Resin transfer from CPU vessel to regeneration plant.iii) Resin transfer from regeneration plant to CPU vessel.iv) Isolation from service.v) Rinse recycle.22.5.5 Manually initiated automatic sequences shall be provided for transferringresin from a vessel to the remote common facility for physical cleaning andchemical regeneration and for returning fresh resin to that vessel. Thesequence of resin transfer from CPU vessel to regeneration plant and fromregeneration plant to CPU vessel shall be initiated from the condensatepolishing unit control panel but shall be controlled by the PLC in theregeneration control panel. Control for chemical dosing system and alkalipreparation facility shall also be provided in it.22.5.6 The following operations shall be performed from the regeneration controlpanel:i) Complete regeneration.ii) Resin transfer from CPU vessel to regeneration plant.iii) Resin transfer from regeneration plant to CPU vessel.200
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