Page 94 - Tata_Chemicals_yearly-reports-2021-22

Integrated Annual Report 2021-22

Annexure 4 to Board’s Report
Conservation of Energy, Technology Absorption

and Foreign Exchange Earnings and Outgo

[Pursuant to Section 134(3)(m) of the Companies Act, 2013 read with Rule 8(3) of the Companies (Accounts) Rules, 2014]

A. Conservation of Energy In the Plant at Mambattu:
(i) The steps taken or Impact on Conservation of • Pressure Reduction Turbine [PRT] (4 Tonne Per
Energy: Hour 160 KW): PRT installed in place of Pressure
Following Lean Six Sigma (‘LSS’) and non-LSS projects Reducing Valve (PRV - 4 TPH) generated 2,85,000
were undertaken during FY 2021-22: units
• Reduction of maximum demand from 3,000 KVA
In Soda Ash Plant at Mithapur:
to 2,400 KVA
• Increased throughput and reduction of steam • Astronomical timers were installed for all utility
consumption at Monohydrate plant area lighting which work based on the variations in
• Ingersol Rand compressor replacement with GHH the sunset and sunrise times throughout the year
Gmbh, along with turbine and gear box
In the Silica Plant at Cuddalore:
In Make-Up Water (‘MUW’) Plants at Mithapur:
• Reduction of sodium silicate specific consumption
• Reconfiguration from double effect to quadruple by undertaking LSS projects to reduce spillages,
effect evaporation at units 1/2 at MUW 3 arrangement of filter deck plates and undertaking
• Reduction in 50 psig (pound per square inch) improvement project for achieving the right
steam consumption at MUW 4 by automating the quality in the first instance
draw and optimisation of anti-scalant dosing • Reduction of coal specific consumption by doing

In the Cement Plant at Mithapur: insulation in various areas thereby leading to
reduction in radiation loss; installation of steam
• Reduction of the Clinker factor of Ordinary trap; pre heating the feed water from blowdown
Portland Cement (OPC) and Masonry Cement
flash steam; reusing brick block fixing and
• Consumed alternate fuels: shredded plastics, replacement of bellow to reduce the heat losses
spent resin, spent oil, spent grease, Toluene and replacement of walt tube
Di-isocyanate (TDI) Tar
• Establishing Standard Operating Procedure
• Improved Cement Mill throughput by 5% to 8% to optimise coal reduction; installation of
by use of grinding aid canopy in spray dryer section to reduce the
• Launched OPC superior with 5% performance specific consumption of coal. Also achieved
improver leading to conservation of natural increase in the plant capacity utilisation from
resources 50% in FY 2020-21 to 66% in FY 2021-22 which
Energy efficiency projects in Power Plant at Mithapur: reduced the stop losses
• Improvement of heat recovery and transfer • Reduction of water specific consumption in
process in the power plant to reduce heat losses mechanical seal recirculation system and reusing
wash water to filter process washing
• Major overhauling of 3 topper turbines
• Reduction in specific power consumption:
Measures undertaken in Electrical Systems at I. Variable drive for food grade recirculation,
Mithapur:
mechanical seal, filter press charging,
• New capital projects being undertaken with hot air generator coal convey fan, boiler
energy efficient motors, energy efficient lighting FA fan, boiler feed pump, Compressor-2,
and high efficiency distribution transformers water treatment plant, wash water pumps,
• Replacement of 2 transformers with higher process water pumps, effluent treatment
energy efficiency disposal pump

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