Comparative study of reactivity to CO2 of cokes used in stone wool production

Leth-Miller, Rasmus; Jensen, Anker Degn; Jensen, Jakob Søndergaard; Glarborg, Peter; Jensen, Lotte Bjerregaard; Hansen, Peter Bent; Jørgensen, Sten Bay

doi:10.1016/j.fuproc.2004.05.013

Cited by 11 publications

(12 citation statements)

References 14 publications

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“…The BT is the temperature at which the burnout rate reaches 1%/min, and the PT is the temperature at the maximum burnout rate. An isothermal TGA test that modified the British Standard (BS 4262-1984) for measuring coke 'reactivity' towards CO 2 was also used [29]. The sample was heated in a N 2 atmosphere at 50°C/min up to 1000°C with a hold time of 10 min before switching to a CO 2 gas flow for 2 hours.…”

Section: And Commercial Coke 2)mentioning

confidence: 99%

Factors affecting the microwave coking of coals and the implications on microwave cavity design

Binner

Mediero-Munoyerro

Huddle

et al. 2014

Fuel Processing Technology

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The work carried out in this paper assessed how processing conditions and feedstock affect the quality of the coke produced during microwave coke making. The aim was to gather information that would support the development of an optimised microwave coke making oven. Experiments were carried out in a non-optimised 2450 MHz cylindrical cavity. The effect of treatment time (15 -120 min), power input (750 W -4.5 kW) and overall power input (1,700 -27,200 kWh/t) on a range of coals (semi-bituminous -anthracite) was investigated. Intrinsic reactivity, random reflectance, strength index and dielectric properties of the produced cokes were compared with those of two commercial cokes to assess the degree of coking produced in the microwave system.Overall energy input and coal rank were found to be the major factors determining the degree of coking following microwave treatment. The dependency on coal rank was attributed to the larger amount of volatiles that had to be removed from the lower ranked coals, and the increasing dielectric loss of the organic component of the coal with rank due to increased structural ordering. Longer treatment times at lower powers or shorter treatment times at higher powers are expected to produce the same degree of coking.It was concluded that microwave coke making represents a potential step-change in the coking industry by reducing treatment times by an order of magnitude, introducing flexibility and potentially decreasing the sensitivity to quality requirement in the feedstock. The main challenges to development are the energy requirements (which will need to be significantly reduced in an optimised process) and penetration depth (which will require an innovative reactor design to

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Section: And Commercial Coke 2)mentioning

confidence: 99%

Factors affecting the microwave coking of coals and the implications on microwave cavity design

Binner

Mediero-Munoyerro

Huddle

et al. 2014

Fuel Processing Technology

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“…By using the Arrhenius equation, the following expression can be derived [10][11][12][13][14][15][16][17][18][19]:…”

Section: Solid Phase Analysismentioning

confidence: 99%

“…Often these have positive values that, in a notation of exp(DE/RT), can result in a misunderstanding (a negative value of activation energy). Using relation (17) and satisfying condition (8), one can derive the linear form:…”

Section: Gaseous Phase Analysismentioning

confidence: 99%

The Boudouard–Bell reaction analysis under high pressure conditions

Mianowski

Robak

Tomaszewicz

et al. 2012

J Therm Anal Calorim

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A new method for the measurement of solid fuel reactivity towards carbon dioxide has been developed. This new method takes into account high-pressure and temperature effects. Three devolatilized carbonaceous materials have been used in experiments: chars derived from lignite, bituminous coal and blast furnace coke. Processes were carried out at temperatures of 800, 850 and 900°C and pressures of 1.52, 2.5 and 3.4 MPa. Analysis of the product gas composition was carried out with the maximum degree of conversion of CO 2 (a m ) proposed as a representative reactivity parameter. Arrhenius and Eyring relationships have been analyzed, and values of the activation energy and activation volume have been calculated.

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“…Significant impact of the coke properties and reactivity on the cupola operation in stone wool production has been reported [20]. With a more reactive coke less heat is lost to the cooling water and therefore coke can be saved.…”

Section: Fig 1 Flow Diagram Of the Stone Wool Manufacturing Process mentioning

confidence: 99%

Comparative Environmental Life Cycle Analysis of Stone Wool Production Using Traditional and Alternative Materials

Hera

Muñoz-Díaz

Cifrián

et al. 2016

Waste Biomass Valor

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The mineral wool sector represents 10 % of the total output tonnage of the glass Industry. Thermal, acoustic and fire protection properties of the mineral wool makes it a product used in a wide range of economic sectors specially in the construction industry for the creation of low energy buildings. The traditional Stone wool manufacturing process involves melting of raw materials, in a coke-fired hot blast cupola furnace, fiberization, polymerization, cooling, product finishing and gas treatment as main stages. The use of alternative raw materials as torrefied biomass and sodium silicate, is proposed as alternative manufacturing process in order to improve sustainability in the Stone wool production, particularly reducing gas emissions (CO2 and SO2). The present study adopts a life cycle analysis (LCA) approach to measure the comparative environmental performance of the traditional and alternative stone wool production process; process data are incorporated into a LCA model using SimaPro 8 software with Ecoinvent version 3 life cycle inventory database. CML 2000 and Eco-Indicator99 methods are used to estimate effects on different impact categories. The impacts Minerals and Land use in Eco-Indicator99, and the Euthrophication impact in CML2000, increase between 2-4% using the alternative process instead the traditional one. In the same way, all the ecotoxicity related impacts increase between 9-24% with the use of alternative process. However these increases are compensated by impact decreases in other categories of impact; in consequence, the three areas of impact that grouped all individual Eco-indicator 99 impacts, show environmental benefits between 6-15% when using alternative process based on torrefied biomass and silicate, instead traditional process based on coke and cement use.

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Comparative study of reactivity to CO2 of cokes used in stone wool production

Cited by 11 publications

References 14 publications

Factors affecting the microwave coking of coals and the implications on microwave cavity design

Factors affecting the microwave coking of coals and the implications on microwave cavity design

The Boudouard–Bell reaction analysis under high pressure conditions

Comparative Environmental Life Cycle Analysis of Stone Wool Production Using Traditional and Alternative Materials

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