Kahalgaon STPS Stage-I ESP R&M: Brief scope and Salient technical features for NIT

ANNEXURE-I

Salient Technical features:

The intent of the Renovation and Retrofitting of Existing ESPs is to reduce the particulate emission level to ≤ 50 mg/Nm3 to ensure compliance to Environmental Norms.

Brief scope consists of the following:

i.Renovation, Modernization and Refurbishment works of existing ESP and Augmentation & Retrofitting with additional collection area as per options- I OR II.

a)Option-I: Renovation, Retrofitting & Refurbishment of existing ESPs with rigid discharge frame work type design to meet the target objective.

b)Option-II: Renovation & Retrofitting of existing ESPs of rigid discharge frame work type in combination with Moving Electrode plate type of design ESP to meet the target objective.

ii.All civil works like foundation, structural works for new ESP and Ash Handling system of all (four) the units including strengthening of the existing ESP structures and existing foundations, as required.

iii.Relocation of existing facilities at site.

iv.Any item including material/components/equipment/systems required for facilities needing relocation on account of renovation.

v.Replacement of existing ESP components, existing Transformer-Rectifier sets, Opacity monitor, hopper heaters with its accessories.

vi.Physical Flow Model testing of ESP.

vii.CFD Model testing of ESP.

viii.Engineering of complete microprocessor based control system.

ix.Supply of item / component on as required basis.

x.Supply of Mandatory spares as detailed in technical specification.

xi.Services like dismantling / repair / overhaul / retrofitting of various other components / systems / sub-systems as may be required, to ensure sustained, safe commercial operation, and to meet stipulated design / guarantee requirements and to meet the overall objectives of up renovation & retrofitting of ESP.

xii.The scope of work also includes erection of the equipment, commissioning, gas distribution testing, trial operation, Performance guarantee testing etc.

xiii.Inlet and outlet duct work along with supporting structure, foundation work for connecting the new fields to existing duct work.

xiv.Ash hoppers complete with accessories.

xv.Extension of existing control room or provision of containerised substation (Electrical house), if required to accommodate new ESP panels of new pass / field.

xvi.Dry & Wet Ash Handling System for new ESP hoppers including associated civil and electrical & C&I works. Further, dry ash evacuation system for existing last three

(3) fields of all four (4) passes of U#1 and U#2 shall also be provided.

xvii.Modification/ Repair/ Replacement of the existing Ductwork to arrest leakage between terminal points (APH outlet flange to Inlet of expansion joints at ID fan(s) inlet), based on condition assessment and also repairs of ESP casing, Hoppers etc. wherever required including replacement of bracing. The material required shall be in Contractor’s scope.

xviii.Complete servicing/ repairing of the existing guillotine gates and dampers.

xix.Servicing of existing Electric hoists at ESP roof for handling of TR sets based on condition assessment & checking the adequacy of capacity of existing hoists and replacement of the same , if required.

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Kahalgaon STPS Stage-I ESP R&M: Brief scope and Salient technical features for NIT

ANNEXURE-I

xx. Complete Thermal insulation lagging, cladding & refractory for new ESP fields and extended portion and repair/ Replacement of thermal insulation lagging, cladding and refractory between APH outlet flange and to ID fan inlet, based on condition assessment and replacement of same wherever modification/rectification work has been carried out.

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