Selective Waste Gas Recirculation (SWGR) – Energy efficiency for sinter
Primetals Technologies has developed and implemented the Selective Waste Gas Recirculation (SWGR) system to reduce environmental emissions from sinter production. With the SWGR system, offgas from selected zones of the sinter machine is mixed with hot cooler off-air and then recirculated to the sinter strand. The result is a significant reduction of the specific offgas volume to the end-of-pipe gas cleaning by up to 50%.
Sinter cooler waste heat recovery – Transform sinter waste energy into profit
The sensible heat of the sinter that is discharged from the sinter machine to the sinter cooler amounts to almost half of the total process thermal energy input. Primetals Technologies has developed solutions for efficient recovery of this sensible energy by utilization of hot waste air from the sinter cooler for production of steam. Special off-air recirculation concepts lead to increased plant efficiency and additionally ensure compliance with local emission standards.
Top gas recovery turbine (TRT) – Transform off-gas into profit
The blast furnace process consumes upward of 75% of the total energy in an integrated steel plant. The TRT recovers the pressure energy of the top gas of a blast furnace by controlled expansion to low clean-gas pressure. Electrical energy from the waste pressure can be gained without any additional energy input or CO2 production.
Dry slag granulation with heat recovery – Utilization of blast furnace slag heat energy
Primetals Technologies, voestalpine Stahl, the FEhS – Building Materials Institute and the University of Leoben joined forces in an R&D program to develop a new dry-granulation technology using air to cool molten slag and recover the lost heat energy. The slag granulate from this process fulfills the same criteria as wet-granulated slag for use in the cement industry.
Fig.1- Selective waste-gas recirculation system | Fig.2- Sinter cooler waste-heat recovery system | Fig.3- TRT 3D plant layout
Fig.4- 3D Layout of prototyp plant for dry slag granulation
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LD (BOF) gas recovery is an economic solution for LD (BOF) primary waste gas treatment that is completely integrated. The main equipment for the LD (BOF) gas recovery is the gasholder plus the pressure boosters and distribution network. Beside the high efficiency the main focus is on advanced operation safety.
Cooling stack - Highly efficient energy recovery
Converter waste gas cooling is highly challenging due to the tough operating conditions with high loads of abrasive dust particles as well as high temperatures and the general cyclic nature of this batch process. Primetals Technologies ensures high plant availability and best performance by applying state-of-the-art and proven designs and materials and advanced dynamic simulation of process conditions
Energy recovery for electric arc furnaces - Highly efficient waste heat recovery
Most electric arc furnace offgas systems are not thermally optimized, so only nearly 30% of the energy input in the electric arc furnace is used further. Primetals Technologies provides electric arc furnace operators with highly efficient energy recovery systems. The integral approach is based on a modular dedusting system set-up. Basically, either the hot gas line or the forced-draft cooler or both aggregates can be exchanged by an adequate energy recovery system.
AOD waste heat recovery - Solutions for highly efficient energy recovery
A two stage solution helps customer to optimize waste heat recovery in accordance with waste heat utilization. Depending on the individual requirements the first cooling stage for the AOD waste heat recovery system can be realized either as hot water or steam cooled equipment. Additionally the second stage cooling equipment can be replaced by an waste heat boiler or an heat exchanger.
Fig.1- Switch over station for dry dedusting systems | Fig.2- Partially assembled cooling stack | Fig.3- Energy recovery for electric arc furnaces
Fig.4- AOD 3D plant layout
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TATA Steel Port Talbot
Typ of plant
Gas recovery system for LD (BOF)
Although equipped with a suppressed combustion primary dedusting system, the steel shop of TATA Steel Port Talbot (former CORUS), did not feature a gas recovery system until Primetals Technologies was awarded the contract to install the energy recovery system. Jointly with TATA Port Talbot we developed the project according to the highest safety standards in Europe and with smallest impact on ongoing plant operation.