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Rinfra - Sustainability Report - Energy Conservation
Dahanu Thermal Power Station
Dahanu Power Station achieved an average heat rate of 2,300 Kcal/Kwh during the year against the norm of 2,500 Kcal/Kwh specified by the Central Electricity Regulatory Commission for unit of this size.
The Power Station undertakes various energy conservation measures i.e. installation of variable frequency drive in condensate extraction pumps, coal mill seal air fans, Primary Air (PA) fan, corrocoating of Cooling Water (CW) pumps and Auxiliary Cooling Water (ACW) pumps, wind turbo-ventilator, energy efficient lighting systems, etc. This has resulted in saving of power to the tune of 1,040 KW. Installation and commissioning of Vapour Absorption Machine (VAM) system is also nearing completion.
The energy management cell at Dahanu consists of qualified energy managers and auditors, who continue to drive the conservation agenda with defined energy policy, procedures and work instructions. Internal and external energy audits of various systems are carried out at regular interval and all audit findings /recommendations are followed up with appropriate action to implement them.
Dahanu Power Station bagged the prestigious awards like IEEMA Power Awards 2009: 1st prize in the category of "Excellence in Thermal Power Generation", Maharashtra Energy Development Agency (MEDA) State level awards for excellence in energy conservation management, CII - National Award for excellence in energy management - 2008.
The power station completed overhaul of unit No.1 within 16 days against planned period of 25 days. Unit No.1 overhaul has given improvement in heat rate by 30 Kcal/Kwh, resulting in direct saving of Rs. 6.3 crore per annum.
Samalkot Power Station
Various energy conservation measures undertaken were installation of variable frequency drive (VFD) in High Pressure Boiler Feed Pump (HPBFP), Low Pressure Boiler Feed Pump (LPBFP), Destaging of Condensate Extraction Pump (CEP), wind turbo ventilators, energy efficient lighting system, corrocoating of CW pumps, optimisation of Plant Air Compressor and other plant operations, etc. This has resulted in total power saving of 1,024 KW.
The energy cell consisting of qualified energy managers and auditors undertakes various energy conservation projects and conducts energy conservation awareness programmes.
The plant operational strategies have been suitably modified for achieving higher efficiencies, with the result that Samalkot station achieved a gross heat rate of 2,141 Kcal/kwh against the design value of 2,172 Kcal/kwh at an operating PLF of 52.50%.
Goa Power Station
The plant has taken up several initiatives towards conservation of resources and improving environmental performance. Improvement on Cycle of Concentration (COC) and reduction in average water consumption has been achieved. An area of about 1.6 hectares is covered under forestation in and around the plant premises.
Continuous focused efforts towards energy conservation have reduced the auxiliary power consumption to about 2.10% as compared to 2.20% during the previous year and CEA benchmark of 3% for a plant configuration of this size.
The energy management cell at Goa consisting of qualified energy managers and auditors continue to drive the conservation ageda with defined energy policy. Internal and external energy audits of various systems are carried out at regular interval.
Various energy conservations measures i.e. installation of Energy Efficient cooling tower fan blades, efficient lighting systems, multi-stage pressure reduction drag valve, etc. have resulted in saving of 251 KW. Dry ice blasting was also carried out to improve the heat recovery steam generator and differential pressure was used so as to improve its output.
The Power Station has undertaken further initiatives i.e. installation of vacuum pump in place of steam ejector, Variable Frequency Drive (VFD) for High Pressure Boiler Feed Pump, efficient cooling water pumps, etc. to step up energy conservation.