Page 16 - Steel Tech India eMagazine Volume January 2021

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Innovative modular designs generation of 245MW byutilising by-product gases
Light-weighting through use of higher-grade and through waste heat recovery
steel Ŗ TSJ - Achieved lowest ever power rate of 378 kwhr/
Increasing use of pre-tensioned and pre-cast tss.
concrete In addition, Tata Steel has commissioned pilot project
Ŗ 'ZVGPUKQP QH NKHG VKOG QH DWKNFKPIU Ō on ‘Energy Recovery Micro Turbine’ to recover throttling
loss in pressure reducing station for de-aeration
Initiatives at Tata Steel for Improving Material
application of Boiler feed water and commissioned pilot
(IÀFLHQF\ LQ /LIH &\FOH RI 3URGXFWV
project on ‘Vapor Absorption Machine’ to utilise the
Ŗ .KHG %[ENG #UUGUUOGPV .%# QH UVGGN RTQFWEVU HQT waste heat of Boiler blow-down water and condensate/
Environmental Product Declaration (EPD)
steam from steam traps.
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plan to cover all sites
To achieve the stringent target set before the steel
Ŗ ,QKPV RTQLGEVU YKVJ CWVQ EWUVQOGTU VQ CWIOGPV WUG industry and being a responsible corporate citizen,
of high strength steel grades
Tata Steel understands that radical shift in technology
Ŗ 6CVC 2TCXGUJ CPF 6CVC 5VTWEVWTC CTG VJG ſTUV UVGGN is imperative for deep decarbonisation. However, these
RTQFWEVU VQ TGEGKXG )TGGP2TQ EGTVKſECVKQP KP +PFKC technologies are yet to mature to a commercially viable

Ŗ 2NCP VQ EQOG QWV YKVJ ſTUV '2& HQT RTQFWEVU WUGF KP level. Hence, as a strategy, Tata Steel is preparing
construction sector e.g. Tiscon (TMT Rebars) and itself extensively on a suite of technologies which are at
Pravesh (Steel Doors) various levels of readiness. Some of the technologies
%HVW $YDLODEOH 7HFKQRORJ\ (QHUJ\ (IÀFLHQF\ that would be key to decarbonisation of steel industry
are as follows:
Over the years, the adoption of best available
technologies for waste heat recovery such as Top Top Gas Recycling (TGR)
Recovery Turbine (TRT), Coke Dry Quenching (CDQ), TGR technology is based on lowering the usage of
use of by-product gases in power generation and other fossil fuel with the re-usage of the reducing agents
GPGTI[ GHſEKGPE[ KPKVKCVKXGU JCXG TGUWNVGF KP KORTQXKPI (CO and H ), after the removal of the CO from the
2
2
TGUQWTEG GHſEKGPE[ CU YGNN CU TGFWEKPI ECTDQP HQQVRTKPV top gas. This leads to lower the energy requirements.
Tata Steel has focussed extensively on energy Because of the advantages of high productivity, high
GHſEKGPE[ KPKVKCVKXGU WUKPI HQNNQYKPI NGXGTU PCI (pulverized coal injection) rate, low fuel rate, and
low CO emission, TGR-BF process is considered to be
1. Maximise use of by product gases for power 2
requirements a promising Ironmaking process in future.
2. Maximise Process waste heat recovery for power
generation e.g. CDQ and lowtemperature heat
recoveries
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4. Fully exploit other potential energy recovery sources
like Top Recovery Turbine (TRT), Micro turbines,
Vapour Absorption Machine (VAM) using low grade
waste heat etc.
5. Exploit solar power potential in and around
manufacturing sites Fig. 4: Process route for top gas recycling
Following results have been achieved because of these The technology has been developed and the
initiatives: demonstration of concept feasibility at experimental
Ŗ TSJ - Achieved best by-product gas utilisation of blast furnace scale has been done. Planning is ongoing
98.44% to demonstrate the concept at industrial blast furnace
Ŗ TSJ - Achieved highest ever in-house power scale.

14 STEEL TECH