M R GANESAN CHIEF MANAGER/MECH NEYVELI LIGNITE CORPORATION LTD - PowerPoint PPT Presentation

M R GANESAN CHIEF MANAGER/MECH NEYVELI LIGNITE CORPORATION LTD NEYVELI

NEYVELI LIGNITE NEYVELI LIGNITE CORPORATION LTD, NEYVELI, CORPORATION LTD, NEYVELI, TAMIL NADU TAMIL NADU  MINE I  MINE I A  MINE II  MINE II EXPANSION

NEYVELI LIGNITE NEYVELI LIGNITE CORPORATION LTD, CORPORATION LTD,  Thermal Power Plant I 600 MW ( 6 X 50 MW + 3 x 100 MW)  Thermal Power Plant I Expansion ( 2 x 210 MW)  Thermal Power Plant - II ( 7 x 210 MW)  Thermal Power Plant - II Expansion ( 2 x 250 MW)  Barsingsar Thermal Power Plant ( 2 x 125 MW)

Ongoing Power Projects Ongoing Power Projects  Tuticorin Thermal Power Project ( 2 x 500 MW) being executed by NTPL - A Joint Venture of NLC and TNEB, Tamil Nadu – Under erection

Ongoing Power Power Projects Ongoing Projects  Neyveli New Thermal Power Project ( 2 x 500 MW), Tamil Nadu Under finalisation of Contract.

Proposed Power Projects Proposed Power Projects  (3 x 660 MW) Super Critical Thermal Power Project at Ghatampur in Uttar Pradesh  (3 x 660 MW) Super Critical Thermal Power Project at Sirkali in Tamil Nadu

Needs of Air Handling systems in Needs of Air Handling systems in Power Plant Power Plant  Unit control room, RCE room, UPS & rectifier rooms  Boiler Thyristor rooms  Static excitation rooms  Service building

Package AC Package AC  ESP control room  Switchyard control room  LHS control room

Air washers Air washers  TG hall  Main Cable gallery  Main Switchgear room

Supply air ventilation system Supply air ventilation system  Major MCC rooms Exhaust ventilation Exhaust ventilation  All pump houses, plant buildings  Stores  Toilets

HVAC system HVAC system  Main Plant ( Steam Generator ) package  Main Plant ( Turbine Generator) package  BOP package.

Ventilation S Ventilation S ystem ystem  10 air changes per hour for washed air system  15 air changes per hour for fresh filtered air supply system  20 air changes for exhaust / general air exchange ventilation  Fresh filtered air supply system - fan & motor unit, dry panel type air filter, air intake louvers, ducting, supply air grills, dampers, electrics, instrumentation & controls and multi louver gravity dampers.

Ventilation S Ventilation S ystem ystem  Exhaust ventilation system - fan & motor unit, out let cowl with bird screen / back draft damper & ducting if any etc.  Centrifugal fan - for fresh filtered air supply system. However, axial flow (tube axial) fan for system capacity up to 5000 m3 /hr.

Centrifugal Fan Centrifugal Fan  The fan impeller shall be of backward curved blades.  The fan casing and blade shall not be less than 2.5 mm thick MS sheet.

Centrifugal Fan Centrifugal Fan  The shaft shall be of EN 8.  Variable inlet vane damper at the centrifugal fan inlet.  The fresh air intake louvers consists of parallel metallic blades.

Tube Axial Fan Tube Axial Fan  Fan impeller - aerofoil section. The speed of the TA fan preferably within 1000 rpm and outlet velocity within 12m/sec.  The TA fan with Pre-filter - with rain protection Cowl & Bird screen / wire mesh at the suction side of the TA fan for protection against physical & climatic encounters.

Tube Axial Fan Tube Axial Fan  Fan to be installed in fire hazardous/acid area shall be spark proof construction and painted with acid resistant paint/anti corrosive lining.  The impeller - cast aluminium alloy construction of high efficiency aerofoil section blades.

Tube Axial Fan Tube Axial Fan  Axial flow fan casings for wall mounted/roof mounted fans and their components shall be suitable for outdoor installation. The casing shall be minimum 2 mm thick.

Pre Pre-Filters Filters  Dry panel type air filter shall be of high efficiency cleanable type, constructed out of HDPE (6 ply) supported by layers of GI wire gauge.  It shall be corrugated to the depth of filter casing in order to increase the ratio of filtration area to frontal area.

Pre Pre-Filters Filters  It shall be covered by strong GI frame and have space to ensure uniform distribution of air.  Filtering panel shall be of standard size.  Face velocity of air shall not exceed 2 m/sec.

Pre Pre-Filters Filters  The resistance of air filter shall not exceed 10 mmWC when dirty.  Efficiency of the filter shall not be less than 90% down to 10 microns.  casing of not less than 3.15 mm thick M S sheet.

Fire Damper Fire Damper  The Fire damper shall be provided at out-let of the TA Fan / Centrifugal Fan to isolate the served premises in case of fire occurrence.  These shall be electrically operated & interlocked with plant's fire protection system.

Duct Duct  The ducting for ventilation and air conditioning systemsshall be fabricated from G.I. sheets.  Guide vanes shall be provided in all large duct bends for proper flow of air.

Duct Duct ------------------------------------------------------------------------- Large side of rectangular Duct/diameter of Circular Thickness (mm) duct (mm) -------------------------------------------------------------------------  0 - 800 1.0  801 - 1500 1.25  1501 and above 1.6 -------------------------------------------------------------------------

Duct Duct  The joints & bracings for ventilation & air conditioning systems - as per IS: 655.  All flanged joints - with asbestos rope of dia. 5 mm for proper sealing of the joints.

Duct Duct  Turning guide vanes shall be provided inside the duct wherever change of direction occurs, to minimise eddy formation.  Duct work shall be complete with flanges, stiffeners, fasteners, hangers, nuts, bolts, washer & gaskets etc.

Supply Air Grilles / Diffusers Supply Air Grilles / Diffusers  G.I. sheets not less than duct thickness for the manufacture of grills.  No distortion or warping is permitted.

Availability Availability  The equipment selected shall be new and best of its type available with respect to material and workmanship considering the continuous and reliable operation.  The equipment shall be maintenance free as far as practicable.  The spares shall be easily available.

Availability Availability  All materials used shall be free from surface defects, rust, cracks and deformations.  The finish of the equipment and its components shall be of first class quality.

Availability Availability  The components and equipment shall be so selected that the system down time is kept minimum. S ystem design shall be such that fast and easy replacement of componentscould bepossiblewherever necessary.  To the extent possible models and sizes of equipment shall be identical to ensure minimum inventory and interchangeability of parts, equipment and systems

Performance of Air handling Performance of Air handling system in Power plants. system in Power plants.  No major problems noticed.  Water quality was a issue. Hence DM water was used for chilled water.  Fine ash accumulation in Cooling coil fins

Issues in Project Procurement Issues in Project Procurement  Earlier, tenders were floated packages wise.  Now, 3 package system like SG, TG & BOP has been followed  Major deviations are taken by the contractors after award of contract.

Plant procurement Plant procurement  Online registration with the Material Management department.  Limited tender enquiry  Press tender enquiry

Sub vendors Sub vendors  For major system like water treatment, CW system, Fire protection system etc, a brief Qualifying requirements is included in the tender specification for BOP package. Accordingly sub venodrs for these system will be selected after award of contract of the BOP package.

Expectations from Manufacturers Expectations from Manufacturers  Compliance to the specification and avoid deviations.  equipments running with natural energy  Wind turbine ventilators.

Thank Y ou Thank you