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- Title
Impact of new water consumption norms for power plants in 2×125MW Barsingsar thermal power station, NLC India Ltd.
- Authors
RAJKUMAR, S.; RAMESH, V.
- Abstract
Water is the basic necessity for survival. India has only 4 per cent of its fresh water resources. Out of which, 87% of water is used by the thermal power plants for its needs. Due to the increasing demand, it becomes important to look for holistic approaches for water conservation and management. As per the latest MoEF and CC Gazette notification dated 07-12-2015, water consumption for all existing CT based thermal plants should reduce specific water consumption up to maximum of 3.5 m³/MWh within a period of two years from the date of publication. Barsingsar thermal power station (BTPS) of NLC India Ltd., achieved the above MoEF and CC norms (i.e. 2.933 m³/MWh for 2016-17) by following optimization techniques. • Reducing blow down through increasing COC (reduce) • Reusing effluent water effectively (reuse) In cooling tower operation, water consumption is more than 80% of thermal water needs, due to evaporation. By reducing the above consumption through increase in cycles of concentration, thus results in decrease of direct blow down. By increasing the COC from designed value of 3 to 5, the DBD reduced from around 285 m³/hr to 150 m³/hr. Hence the water consumption got drastically reduced by around 8,28,000 m³/annum (which is around 19.25% of total annual consumption). This reduced direct blow down water collected along with DM plant effluent, treated sewage water, thickener overflow from pre-treatment plant, process line drains, and CBD/IBD drains in guard pond. This collected water from guard pond is then treated to get the neutral pH and after checking effluent parameters according to the pollution norms, this water is used for mainly pit head lignite mines dust suppression system and dust suppression of lignite handling system and ash handling system, gardening, sanitation and flushing purposes. Around 45000 m³/month (5,40,000 m³/annum) of water is being discharged to mines dust suppression by EDP pumps and thus reused. Conclusion 1. Total Water conserved through reduction of blow down by maintaining higher COC, is 8,28,000 m³/annum (which is around 19.25% of total annual consumption). 2. The effluent water is not let out, as it is being reused effectively for dust suppression in mines thus achieving water conservation of 5,40,000m³/annum which is around 12.5% of total annual consumption. 3. Considering the above reuse and reduce operations, total water conserved is around 31.75% of total annual water consumption. 4. Therefore specific water consumption of 2.933m³/MWh was achieved for the year 2016-17, which is well below the MoEF and CC norms through the above implementation. 5. The discharge limits set by pollution control boards were met. 6. A clean, green and healthy environment is maintained in and around the plant premises.
- Subjects
POWER plants; WATER consumption; WATER conservation; NLC India Ltd.; COOLING towers
- Publication
Indian Journal of Power & River Valley Development, 2019, Vol 69, Issue 11/12, p204
- ISSN
0019-5537
- Publication type
Article