Excellence in energy conservation

Multiple sites: Towards achieving excellence in energy conservation

Excellence -in -energyOur sites are committed to conserving energy to derive multiple benefits such as lower fuel consumption, better profitability, environment protection, and a lower carbon footprint.

Individual proposals, discussions in small groups, and brain storming sessions for employees help to generate a variety of opportunities to save power. Key action is in saving energy and natural resources include the optimisation of existing processes, modification of processes or equipment and the inclusion of new technologies.

One energy conservation initiative involved the energy team at the CBM project at Raniganj, who found a much more efficient way of running the large number of pumps required to push gas around the network on site. These so-called progressive cavity pumps were previously being operated at their optimum speed through the use of variable frequency drives (VFDs) to control the motors operating them. But the problem with having multiple VFDs was that they generated harmonics in the power network which reduced the capacity utilisation of the generators being used to provide power. The Raniganj team therefore introduced harmonic filters into the system, which resulted in an increase in power efficiency of nearly 10%. An estimated reduction of 79.56 metric tonnes of CO2 was achieved with this initiative during the first few months post-installation in FY2013.

Amongst various energy initiatives implemented at our refinery in Vadinar, one of the key initiatives was to recover desalinated condensate heat to be then used to heat demineralised water and reduce cooling tower heat load. Before the implementation of the project, desalinated suspect condensate with an average temperature of 66 degrees Celsius was routed to the condensate tank without any heat exchange. With a little modification to divert the desalinated condensate to the demineralised water condensate exchanger, 2.9 gigacalories per hour (GCal/hr) of energy was saved. Whilst the project cost a minimal amount of US$1,800, the savings amounted to an estimated US$182,000 per annum.

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