• provide System engineering and optimisation
  
• engineer and procure the balance of plant systems

for gas turbine and steam turbine based power plants on turn-key basis. Subsequently, it has been geared up to provide engineering and technical support for various turnkey projects of any scale and magnitude in India and abroad. PED has engineered several gas turbines and steam turbine based power projects on turn-key basis till date. The list of customer references is enclosed.

The erection and commissioning of the entire power plant, namely power block equipment (GT, HRSG, ST and Boiler) and balance of plant equipment, are carried out by respective power sector groups of BHEL, namely Northern Region (PSNR), Eastern Region(PSER), Southern Region(PSSR) and Western Region(PSWR). Depending upon the location of site, one of these four agencies carryout the complete erection and commissioning of power plant.

This system consists of a boiler, steam turbine generator and balance of plant systems. PED takes up steam turbine based plants upto 60Mw capacity .

• Simple cycle power plants,
• Co-generation plants and
• Combined Cycle power plants

Simple cycle power plant consists of only gas turbine generator and its auxiliary systems. The exhaust gas from GTG is let into atmosphere.

Co-generation plant consists of gas turbine /gas turbine generator with HRSG to generate steam using exhaust gases from GT. Steam generated is used either to generate power or in process.

The steam turbine plants of more than 60Mw capacity taken up by Project Engineering Management group based at New Delhi. This division also engineers and executes thermal power plants.

Combined Cycle power plant consists of gas turbine generator, HRSG and steam turbine generator. The steam generated from HRSG is fed to steam turbine for power generation.

These gas turbine and steam turbine plants require various auxiliary systems to support gas turbine, heat recovery steam generator, steam turbine and boiler for reliable and continuous operation of plant. These are also called balance of plant systems. The balance of plant systems and works are classified into four types namely Civil, Mechanical, Electrical and Controls & Instrumentation.

PED carries out the system design and equipment selection for combined cycle and co-generation plants. This includes selection of Gas Turbine model, HRSG parameters, Steam turbine capacities, Integration of power block equipment and sizing of balance of plant systems. PED also carries out optimization studies of thermal systems.

The department has forty engineers to take of Civil, Mechanical, Electrical and C&I systems and works. PED is an engineering group which procurement of balance of plant equipment and systems. The type of works and systems taken up by the department are elaborated below :

The civil engineering group will carryout the design and estimation of the following works.

• Site leveling and grading
• Soil investigation
• Green belt development
• Roads within power plant area
• Foundation design for all equipments
• Power plant buildings like Gas turbine hall, Steam turbine building, control room buildings / enclosures for balance of plant equipment / machinery.
• Non-plant buildings like administration building, canteen, vehicle parking lots, guardrooms and rest rooms.
• Storm water drains and trenches within power plant area.
• Pipe racks and pipe sleepers and pipe troughs.
• Water reservoirs for power plants.

The analysis and design are carried out using advanced software packages like STAAD-Pro, Ex-Steel.

The mechanical engineering group carries out the following work content.

• Thermal system engineering, optimisation and integration.
• Power plant guarantees, heat balance diagrams and water balance diagrams.
• Power plant engineering
• Balance of plant systems engineering and procurement

• Gas fuel conditioning systems
• Liquid fuel storage and conditioning systems
• Water treatment systems (Raw water, DM water, service and potable water systems)
• Effluent treatment and disposal systems
• Nitrogen and compressed air systems
• Cooling water systems for condenser
• Auxiliary cooling water systems
• Material handling systems
• Fire protection and fire alarm systems
• Chemical dosing systems
• Air conditioning and ventilation systems
• Black start and emergency shutdown systems
• Steam and feed water systems
• Coal and ash handling systems

• Power plant piping for fuels, steam, feed water, nitrogen, compressed air, effluent disposal etc.
• Workshop equipment
• Performance guarantee tests.

    a) Electrical system studies to finalise the sizes of sources (generators, stepup & distribution transformers, fault limiting transformers/reactors), generating and evacuation voltages, prospective fault currents and terminal voltages at various voltage levels.
    b) Overall key single line diagram (SLD) and SLDs of individual sub system & package
    c) Protection co ordination and relay settings
    d) Stepup, distribution & fault limiting transformers, reactors
    e) Switchboards for each voltage level
    f) Reliable sources (DG sets, UPS, DC systems)
    g) Control and synchronizing philosophy
    h) Energy Management of total asset of customer (power plant plus process industry) including centralized control and monitoring, optimal load sharing of various sources, export/import regulation with respect to local grid, load shedding to ensure reliable uninterrupted supply to critical loads to the process industry, advice on power factor improvement and starting of large motors, . . .     
    i) Black start and normal/emergency shutdown requirements
    j) SCADA for Remote control of power station
    k) Plant Illumunation
    l) Plant intercommunication
    m) Cables and cable trays and accessories
    n) Earthing devices (NGT, NGR, solid, electronic earthing) and underground & above ground earthing
    o) Layouts of switchgear rooms, transformer yards, cable routes, . . .
    p) Cable schedules and interconnection charts

       1) The department is equipped with the latest state of art facilities & software packages for system studies, illumination and earthing sizing, etc
       2) Stringent specifications of leading domestic and overseas consultants (EIL, DCL, MECON, Electrowatt, . . . ) and customers (NTPC, IOC, BPCL, HPCL, PDO, Oman, Ministry of Elec & Water, Oman, TNB, Malaysia, . . . ) have been complied.
       3) Continuous upgradation of technical knowhow about system engineering aspects as well as products takes place by frequent participation in witness of type tests, interaction with leading consultants, customers and third party houses.