The influence of furnace design on the NO formation in high temperature processes

Zajemska

Clean Techn Environ Policy

et al. 2021

The article presents innovative technology which integrates a metallurgical pusher-type furnace with a waste heat recovery system that consisted of a reactor for torrefaction and pyrolysis of waste biomass. The technology is designed for utilizing both liquefied and gaseous by-products (torgas, pyrolysis gas and condensate denoted as TPC) obtained from torrefaction and pyrolysis of waste biomass. TPC is considered to be applied as an additional fuel for a metallurgical furnace as an example of effective energy management in metallurgical industry. In detail, the technology contains waste heat recovery unit installed on the furnace smoke stack as the heat source for the pyrolysis/torrefaction reactor. The analysis was carried out for a pusher furnace, fed optionally with either natural gas or coke gas. Share of this gaseous/liquid TPC fuel from waste in the total fuel mixture fed to the furnace was varied from 5 to 15% by volume. Practical usefulness of TPC fuel was tested on a specially constructed test stand. Financial analysis in energy consumption and economy of using the obtained TPC fuel for co-combustion with coke gas in the metallurgical pusher furnace was carried out on the basis of data from a steel sheet roller combined with the pusher furnace located in one of large steel works. It was shown that the use of this TPC fuel derived from thermal treatment of waste biomass and other organic substances can be considered an effective method of reducing production costs in the analyzed steel company and can lead to increase in the attractiveness of their products and thus strengthen their competitiveness on the global market. Graphic abstract

Section: Innovative Strategies and Technologiesmentioning

confidence: 99%

Integration of waste biomass thermal processing technology with a metallurgical furnace to improve its efficiency and economic benefit

Zajemska

Clean Techn Environ Policy

et al. 2021

Advances in Applied Ceramics

“…Higher melting temperatures require more energy (generating higher CO 2 emissions), cause greater melt volatilisation and therefore higher levels of particulates, can increase refractory corrosion of some melters, and produce higher levels of thermally generated NOx. 98,121 It is therefore vitally important to minimise melting temperatures and melting times if waste vitrification is to be economically viable. As demonstrated for commercial soda lime-silica glasses, careful optimisation of furnace efficiencies, 98,122 choice of raw materials 98,122,123 and changes to final glass composition 124,125 may allow reductions in melting temperature or in melting energy.…”

Section: Melting Vitrification and Environmental Factorsmentioning

confidence: 99%

Vitrification of toxic wastes: a brief review

Bingham¹,

Hand²

2006

Whilst the vitrification of waste materials is a well established technology, hitherto it has not been economically viable on any substantial scale when applied to non-radioactive wastes. However new UK and European legislation may affect this situation. The present paper briefly reviews published work pertaining to waste vitrification in terms of legislation, waste compositions, energy, emissions and economic assessments. The focus is on vitrification of ashes arising from the incineration of municipal solid waste (MSW) and sewage sludge in terms of their composition, glass melting and reuse potential. The conclusion is that the high compositional variability of these and other wastes tends to preclude their use in many applications. However, the use of modern sorting and separation technology coupled with better control of waste treatment procedures may help to improve the range of potential uses for these wastes.

“…Some of such applications include glass melting and production of cement, steel, ferrous and aluminum. In these processes, production has been increased from 15 to 65%, while combustion efficiency has increased between 10 and 30% [14].…”

Section: Introductionmentioning

confidence: 99%

Effect of the combustion system on reduction of thermal specific energy consumption in an industrial high temperature process

Herrera

Rivas²,

Muñoz³

et al. 2021

DYNA

This paper presents an experimental study carried out in an industrial furnace for frits production using different configurations of burners based on different combustion techniques such as enriched air combustion, flat-flame oxy-combustion and preheater air combustion. The residence time of combustion gases inside the furnace also was modified. Several combustion configurations were tested and its effects on productivity and thermal energy specific consumption and efficiency were determined. The results show that higher residence time of the combustion gases can decrease significantly the specific consumption of fuel, while the change of the burners and combustion techniques did not show significant effects on decreasing the energy consumption. However, it is highlighted that the oxy-combustion flat-flame burners produced the lowest specific consumption of fuel. Even though the experiments were conducted in a furnace for frit production, the corresponding results can also be applied to guide or improve other industrial high temperature processes.