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Fuel Handling System (FHS)

All disparate fuels such as coal, biomass, oil, gas, waste gas and biogas are transferred from storage using a set of interconnected systems specifically designed & engineered for handling such fuels and for providing the required capacities. The fuel handling system (FHS) conveying capacity is specified in Tons per Hour (TPH). A FHS handling coal as fuel would typically incorporate the following equipment:

  • Ground Hopper
  • Rack / Rod Gates
  • Feeders
  • Belt Conveyors
  • Metal Detectors
  • Magnetic Separators
  • Screen
  • Crusher
  • Two Way Chutes / Tripper Conveyor
  • Bunker

Ash Handling System (AHS)

Ash is the output of any fuel combustion process in power plants and is generally classified into Bed Ash and Fly Ash. Ash collected at the outlet of ash hoppers located in the flue gas path below Air Preheater (APH), Economiser (ECO) and Electrostatic Precipitator (ESP) is classified as Fly Ash and is collected & conveyed for storage in fly ash silos. Similarly ash collected below boiler bed is classified as Bed Ash and is collected & conveyed for storage in bed ash silos.

Ash in general is conveyed usually in two forms dry and wet. Dry ash handling is possible either by using Mechanical Systems such as screw feeders, screw conveyors, belt conveyors or by using Pneumatic Dense Phase Systems with air compressors as auxiliary equipment. Wet ash handling is manually adopted only for Bed Ash is usually a submerged type handling system using scrapper conveyor.

Ash discharge from the bed ash and fly ash silos discharge chutes. If ash is to be discharged in wet condition, is achieved through ash conditioners are located below the silos to wet the ash before it is loaded on to trucks.

Water Treatment Plant (WTP)

Water is required for the power plant for cooling and for cycle make-up. In order to ensure water of the required quality for the power plant, Water Treatment Plants (WTP) are required.

Similarly, in order to conform to environmental regulations, the effluent water generated from the power plant process needs to be treated in an Effluent Treatment Plant (ETP). EGBPSPL has considerable expertise in design, selection, supply and execution of both WTP and ETP.

Based on the analysis of the available water, the WTP scheme for the plant is decided. In general, one or more of the following equipment are used:

  • Pre-treatment Dosing System
  • Clarifier System – High Rate Solid Contact Clarifier (HRSCC)
  • Multigrade Filter (MGF)
  • Ultra Filtration System (UF)
  • Reverse Osmosis System (RO)
  • Degasser System (DGF)
  • Strong Acid Cation (SAC)
  • Strong Base Anion (SBA)
  • Mixed Bed (MB)
  • pH Correction Dosing System

Compressed Air System (CAS)

Similar to water, air is another necessity in the power plant to cater to the requirements of instrument air & service air. The CAS of the plant is designed and engineered such that 100% availability of compressed air is ensured. Instrument air is primarily required for pneumatic control valves and actuators in the power plant whereas service air is required for steam generator start-up and other services.

The plant compressed air system will consist of Air Compressors & Air-Drying Plants (ADP), Air Receivers & interconnecting compressed air piping. It will also include Control panels, Instrumentation & control.

Separate air receivers of suitable capacity are provided for both instrument and service air requirement.

Heat Ventilation & Air Conditioning (HVAC)

240C is generally the human comfort temperature which is a common design reference in HVAC engineering. EGBPSPL is well equipped to provide cost effective HVAC solutions for power plants. The HVAC solutions provided for power plants generally comprise the following:

  • Packaged / Split / Centralized / Ductable Split type air conditioning systems
  • Air washer / dry ventilation system for the turbine building
  • Pressurised ventilation systems for electrical rooms with supply air fans, ducting, exhaust fans and gravity dampers as required.
  • Forced ventilation system with exhaust fans and gravity dampers

Fire Protection System (FPS)

Fire incidents are unpredictable, but prevention of damage to human life, equipment, property and buildings is of utmost importance. Design and engineering of firefighting systems are carried out as per the erstwhile Tariff Advisory Committee (TAC) norms. Damages due to fire can be extensive, but preventive measures are taken to counter the effects in event of occurrence for which the following are systems are provided:

  • Fire Protection Pumps ie Jockey, AC & DC Driven Pumps
  • Fire Water Storage reservoir for fire protection system
  • Fire Hydrant Systems with hydrant lines, hydrants, monitors and foam system as required
  • Sprinklers for coal handling system
  • HVWS and MVWS systems for transformers, cable gallery and lube oil tanks
  • Portable CO2 and Foam Extinguishers at strategic locations
  • Addressable and Non-Addressable fire alarm systems with smoke detectors, photo electric sensors, heat detectors, hooters etc

Material Handling Equipment

The basic purpose of material handling equipment is for handling heavy equipment and components in the plant. The following types of material handling equipment are commonly provided in power plants:

  • Electrically Operated Traveling (EOT) crane in the turbine generator building
  • Hand Operated Traveling (HOT) cranes or underslung cranes in smaller buildings (eg. Pump houses)
  • Material with chain and pulley block at specific locations for lifting identified equipment and conveying to a selected area
  • The capacity, span and lift of the crane are decided based on the loads to be lifted and the location where the crane is installed

Piping & Valves

Engineering of piping systems including piping & valves is systematically carried out for every project which enables even the most complex array of pipe network to be executed with precision so as to facilitate trouble free erection and operation. The piping system generally encompasses the following:

  • Main steam lines of high pressures and temperatures
  • Condensate & feed water lines
  • DM water lines
  • Cooling water and auxiliary cooling water lines
  • Oil lines
  • Fire water hydrant system lines
  • Compressed air system lines for service and instrument air

EGBPSPL has a very experienced piping engineering team support from various facilities in-house & a strong piping erection team at site. This has reflected in quality work as output being achieved in every project executed. The software facilities available for claim are:

  • Piping Stress Analysis – CAESAR
  • CaDDWorks