Waste-to-energy technologies in continuous process industries

Villar, Arturo; Arribas, Juan José Martín; Parrondo, Jorge

doi:10.1007/s10098-011-0385-x

Cited by 42 publications

(30 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…7. 21,[29][30][31][32] Unlike the COSS, the charging shaft is located directly above the melting furnace, but the scrap charge is not continuous and employs a unique scrap-retaining system with water-cooled fingers. The operational temperatures for scrap preheating have reached 773 K (500°C) and higher depending on the type and size of the scrap charge used and the degree of postcombustion.…”

Section: Vertical Shaft Scrap Preheating Systemsmentioning

confidence: 99%

Review of Innovative Energy Savings Technology for the Electric Arc Furnace

Lee

Sohn

2014

JOM

View full text Add to dashboard Cite

A review of the energy innovations for the electric arc furnace (EAF) steelmaking route is discussed. Preheating of scrap using vertical and horizontal shafts that have been commercially successful in lowering the energy consumption to as much as 90 kWh/t reaching almost the operational limit to heating input scrap materials into the EAF is discussed. Bucket-type and twin-shell preheaters have also shown to be effective in lowering the overall power consumption by 60 kWh/t, but these have been less effective than the vertical shaft-type preheaters. Beyond the scrap preheating technologies, the utilization of waste heat of the slags from the laboratory scale to the pilot scale has shown possible implementation of a granulation and subsequent heat exchange with forced air for energy recovery from the hot slags. Novel techniques to increase metal recovery have shown that laboratory-scale testing of localized Fe concentration into the primary spinel crystals was possible allowing the separation of an Fe-rich crystal from an Fe-depleted amorphous phase. A possible future process for converting the thermal energy of the CO/ CO 2 off-gases from the EAF into chemical energy was introduced.

show abstract

Section: Vertical Shaft Scrap Preheating Systemsmentioning

confidence: 99%

Review of Innovative Energy Savings Technology for the Electric Arc Furnace

Lee

Sohn

2014

JOM

View full text Add to dashboard Cite

show abstract

“…Important considerations include reductions in energy consumption and associated costs, while simultaneously stemming harmful pollutant releases. Ideally, wastewater treatment facilities would produce clean water effluent, operate at net-plus energy, and have near-zero pollutant releases to the environment (Münster & Lund, 2010;Villar et al, 2012;Weismantel, 1996). Currently, wastewater treatment facilities do produce clean water, but only at immense energetic and environmental expense.…”

Section: Resultsmentioning

confidence: 99%

Supercritical Water Gasification of Municipal Sludge: A Novel Approach to Waste Treatment and Energy Recovery

Kamler¹,

Soria²

2012

Gasification for Practical Applications

View full text Add to dashboard Cite

“…Other options such as electricity generation, cooling through absorption chillers and heat pumps were found to be less economical. Villar et al (2012) analysed technologies for excess energy recovery in continuous process industries, with the focus on the iron and steel industry. Options for excess heat recovery presented were: excess heat to DHS, coke dry quenching (CDQ) to recover heat for on-site use or electricity generation, recuperation system in the BF, regenerative burners in furnaces, exhaust gas cooling system with steam recovery boiler, and scrap preheating.…”

Section: Recovery Of Industrial Excess Heatmentioning

confidence: 99%

Improved Energy Efficiency and Fuel Substitution in the Iron and Steel Industry

Johansson¹

2014

View full text Add to dashboard Cite

IPCC reported in its climate change report 2013 that the atmospheric concentrations of the greenhouse gases (GHG) carbon dioxide (CO2), methane, and nitrous oxide now have reached the highest levels in the past 800,000 years. CO2 concentration has increased by 40% since pre-industrial times and the primary source is fossil fuel combustion. It is vital to reduce anthropogenic emissions of GHGs in order to combat climate change. Industry accounts for 20% of global anthropogenic CO2 emissions and the iron and steel industry accounts for 30% of industrial emissions. The iron and steel industry is at date highly dependent on fossil fuels and electricity. Energy efficiency measures and substitution of fossil fuels with renewable energy would make an important contribution to the efforts to reduce emissions of GHGs. This thesis studies energy efficiency measures and fuel substitution in the iron and steel industry and focuses on recovery and utilisation of excess energy and substitution of fossil fuels with biomass. Energy systems analysis has been used to investigate how changes in the iron and steel industry’s energy system would affect the steel plant’s economy and global CO2 emissions. The thesis also studies energy management practices in the Swedish iron and steel industry with the focus on how energy managers think about why energy efficiency measures are implemented or why they are not implemented. In-depth interviews with energy managers at eleven Swedish steel plants were conducted to analyse energy management practices. In order to show some of the large untapped heat flows in industry, excess heat recovery potential in the industrial sector in Gävleborg County in Sweden was analysed. Under the assumptions made in this thesis, the recovery output would be more than three times higher if the excess heat is used in a district heating system than if electricity is generated. An economic evaluation was performed for three electricity generation technologies for the conversion of low-temperature industrial excess heat. The results show that electricity generation with organic Rankine cycles and phase change material engines could be profitable, but that thermoelectric generation of electricity from low-temperature industrial excess heat would not be profitable at the present stage of technology development. With regard to fossil fuels substituted with biomass, there are opportunities to substitute fossil coal with charcoal in the blast furnace and to substitute liquefied petroleum gas (LPG) with bio-syngas or bio synthetic natural gas (bio-SNG) as fuel in the steel industry’s reheating furnaces. However, in the energy market scenarios studied, substituting LPG with bio-SNG as fuel in reheating furnaces at the studied scrap-based steel plant would not be profitable without economic policy support. The development of the energy market is shown to play a vital role for the outcome of how different measures would affect global CO2 emissions. Results from the interviews show that Swedish steel companies regard improved...

show abstract

Waste-to-energy technologies in continuous process industries

Cited by 42 publications

References 4 publications

Review of Innovative Energy Savings Technology for the Electric Arc Furnace

Review of Innovative Energy Savings Technology for the Electric Arc Furnace

Supercritical Water Gasification of Municipal Sludge: A Novel Approach to Waste Treatment and Energy Recovery

Improved Energy Efficiency and Fuel Substitution in the Iron and Steel Industry

Contact Info

Product

Resources

About