SALIENT TECHNICAL FEATURES

FOR

DRY SORBENT INJECTION (DSI) SYSTEM PACKAGE

FOR

LOT-1 PROJECTS

A.Brief Scope of Work:

The scope of Dry Sorbent Injection (DSI) System Package for Lot-1 projects shall cover design, engineering, manufacture, shop fabrication, preassembly, shop testing/type testing at manufacturer’s works, packing, transportation,

unloading, handling and conservation of equipment at site, complete services of

construction including erection, supervision, pre-commissioning, commissioning and performance testing of equipments under bidder’s scope of work of Dry Sorbent Injection (DSI) System and its associated auxiliaries including all associated Electrical, Control & Instrumentation , Civil, Structural and Architecture works. Dry Sorbent Injection System shall use Sodium Bicarbonate as well as Hydrated lime(project-specific) reagent and shall have but not limited to the following:

Mobile/Permanent Silos for Sodium Bicarbonate (SBC) as well as Hydrated Lime (project specific) storage complete with Truck Unloading System, Reagent Feeding, Milling and Injection system.

Instrument air compressors;

Complete Electrical System including all motors, LT Switchgears, Transformers, Electrical Actuators, LT power & control cables, cabling, lighting, common MCC containerized substation etc.

Complete C&I systems including SO2 analyser.

Associated Civil, Structural and Architectural works including foundation.

First fill and one year topping requirement of consumables/oils/lubricants, supply of special maintenance tools and tackles, commissioning spares , mandatory spares etc.

Detailed scope of work has been specified in the bidding documents.

B.Other Technical Features:

1.00.00Dry Sorbent Injection (DSI) System

1.01.00System Description:

The DSI system for SO2 control shall be based on Sodium Bicarbonate as well as Hydrated Lime (project specific) as reagent. Sodium Bicarbonate shall be milled before being injected at appropriate location at APH inlet/APH outlet for capturing of SO2 in the flue gas. Hydrated lime will be directly injected at separate location at APH inlet/APH outlet for capturing of SO2 in the flue gas. ESPs are installed downstream of APH where the reactants shall be collected along with ash.

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1.02.00Service Conditions

The Steam Generators are designed to burn pulverised coal. HFO/HPS/LSHS and LDO (as applicable) shall be used during startup and at low loads for warm up and flame stabilization of Steam Generator. The DSI system shall be designed to remove SO2 (to meet the stipulated SO2 efficiency levels) from the flue gas generated in the Steam Generator with pulverized coal firing. High efficiency Electrostatic Precipitators are installed downstream of Steam Generators.

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