Page 82 - Tata_Chemicals_yearly-reports-2020-2021

Integrated Annual Report 2020-21

Annexure 5 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 Cement Plant at Mithapur:
(i) The steps taken or Impact on Conservation of • Replacement of Cement mill outlet diaphragm
Energy: screen segments to improve throughput of the
Following Lean Six Sigma (‘LSS’) and non-LSS projects mill
were undertaken during FY 2020-21: • Wet fly ash system revival to improve fly ash
consumption in Masonry Cement
In Soda Ash Plant at Mithapur:
• Fuel mix with Low calorific value (CV) Indonesian
• Replacement of Ammonia Still preheater no. 6
and WLDS (Weak Liquor Distillation System) stack coal
cooler to reduce efficiency loss • Replacement of conventional lamps/tubes with
• Replacement of Hydrator no. 1 to improve lime efficient LEDs
hydration and temperature loss • Ball mills grinding media regrading to improve
• Replacement of CO compressor no. 6 to reduce specific power
2
steam and water consumption • Replacement of Coal mill diaphragm
• Insulation of major equipment like Ammonia Still • Commissioning of Kakkati vacuum pumps for
no. 6, Prelimer no. 6, Steam Tube Dryer nos. 1 and pumping of CO for carbonation of Effluent Solid
2
9 to reduce heat loss Filtration ('ESF') filter feed slurry
• Trial of various fuels at Soda ash kiln like Siberian
Anthracite and coke breeze briquettes Energy efficiency projects in Power Plant at Mithapur:
• High Pressure Boiler: HPB-3 with Pet coke and
In Make-Up Water ('MUW') Plants at Mithapur:
South African coal – exhaust flue gas temperature
• Replacement of preheater higher area heat reduced from 150°C to 145°C
exchanger to improve energy efficiency in
MUW-1 plant • HPB-4 with Indonesian coal – exhaust flue gas
temperature reduced from 150°C to 140°C
• Replacement of evaporator body-101 with new
evaporator body having increased height and Measures undertaken in Electrical Systems at
volume in MUW-3 plant
Mithapur:
• Optimisation of 120 psig steam consumption by • New capital projects being undertaken with
providing a small diameter jumper in the 6-inch energy efficient motors, energy efficient lighting,
diameter vacuum line in MUW-3 plant
high efficiency distribution transformers and
• Reduction of steam consumption by 25 Metric Intelligent Motor Control Centres
Tonne ('MT") per hour by converting unit-1 and
unit-2 double effect evaporator to quadruple • Replacement of conventional lamps/tubes with
effect evaporator by using 50 psig steam in 4,835 efficient LEDs
MUW-3 plant
In the Plant at Mambattu:
• Flowmeter provided in magma draw line to
maintain continuity in MUW-4 plant • Pressure Reduction Turbine [PRT] (4 Tonne
Per Hour 160 KW): PRT installed with Pressure
• Reduction of magma draw auto valve size from 4 Reducing Valve (PRV - 4 TPH) helps to generate
inch to 3 inch for better control in MUW-4 plant 2,400 units per day and simultaneously reduce the
• Flash steam from first effect condensate recycled steam pressure from 16 bar to 1 bar for process
to second effect to improve energy efficiency in evaporator requirement. The generation of PRT is
MUW-4 plant 7.2 lakh units annually with 300 days operation

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