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

Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Unitsvii) Maximum steam side temperature 10 0 Cimbalance in the LHS & RHS at boileroutlet (from the average)viii) Minimum load with separator running dry 30-40 % TMCR (As permanufacturer’s provenpractice)ix) Header pressure unbalance (steam side) 6%x) Air ingress from furnace bottom Hopper As per manufacturer'spredictions6.4.13 Safety and relief valvesBoiler Safety valves and relief valves shall have minimum dischargecapacities as under:i)ii)ValveMinimum discharging capacitiesSpring loaded safety valves at:a) Separator & superheater Combined capacity 100% BMCRb) Reheater system Combined capacity 105% ofreheater flow at BMCRElectromatic relief valves at:a) Superheater outlet 10% BMCRb) Reheater outlet 15% BMCR6.4.14 Steam purity parametersSteam purity parameters at outlet of the steam generator shall meetrequirement of turbine manufacturer and shall generally not be inferior tothose indicated below:i) Sodium : < 3 ppbii) Chloride : < 3 ppbiii) Iron : < 10 ppbiv) Silica : < 10 ppbv) Cation conductivity : < 0.2 µS/cm6.5 Specifications of Equipment and SystemsThe specified requirements shall be complied for the most stringent conditionsresulting either from the range of coals (design/ worst/ best) or from the rangeof operating conditions specified (like 100% BMCR or HP Heaters out ofoperation etc.), or from both occurring simultaneously, unless specificallymentioned otherwise.6.5.1 Steam generator enclosurei) Steam Generator enclosure shall form air/gas tight envelope fromsecondary air and primary air inlet points to chimney inlet.29