Evaluation of combustion behaviour of coal blends for use in pulverized coal injection (PCI)

Sahu, S.G.; Mukherjee, Ashis K.; Kumar, M. Dileep; Adak, A.K.; Sarkar, Pinaki; Biswas, S.; Tiwari, H. P.; Das, Arijit; Banerjee, P. K.

doi:10.1016/j.applthermaleng.2014.08.071

Cited by 34 publications

(19 citation statements)

References 17 publications

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“…It is a common practice to blend coals prior to blast furnace injection with blends allowing for greater variability and control over the coal properties injected [32,37]. Due to the prevalence of blending in industry, the effects on agglomeration are of much relevance to this study.…”

Section: Blend Agglomerationmentioning

confidence: 99%

“…The experimental use of a DTF is common in investigating blast furnace coal injection [25][26][27][28][29][30][31][32] as a result of the high heating rates and low residence times provided that are akin to those in the blast furnace raceway region, whilst DTF temperatures of 1100°C are suitable for replicating hot blast temperatures (900-1300°C). Following DTF testing, the link between coal caking properties and agglomeration will be measured.…”

Section: Introductionmentioning

confidence: 99%

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Investigating char agglomeration in blast furnace coal injection

Sexton

Steer

Marsh

et al. 2018

Fuel Processing Technology

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A B S T R A C TBlast furnace iron manufacturers aim to reduce expensive coke usage through the injection of coal. This paper investigates contrasting agglomeration behaviour with a view towards optimising blast furnace operations and limiting furnace permeability issues.A drop tube furnace (DTF) was used to investigate the performance of two coal particle size specifications that were representative of injection coal sizes: pulverised (100% < 300 μm, 50% < 75 μm), and granulated (100% < 1 mm, 50% < 250 μm). A range of coals was subjected to DTF testing with issues arising from the injection of caking coals. Results show these coals exhibit signs of agglomeration, a potentially problematic effect concerning blast furnace permeability. Considering gasification reactivity upon leaving the blast furnace raceway, it was found that the agglomerated coal chars do not suffer from poor reactivity and are more reactive than the non-agglomerated chars. Pre-treatment through oxidation was found to be an effective means of eliminating agglomeration in the DTF as a result of the reduction in caking properties.

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Section: Blend Agglomerationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigating char agglomeration in blast furnace coal injection

Sexton

Steer

Marsh

et al. 2018

Fuel Processing Technology

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“…By probing through sampling ports, residence times may vary between several ms up to several seconds [54,58]. Operation pressures of up to 100 bars are employed, with sample mass flow rates for DTFs ranging from 10 −3 up to 2 kg/h [7,46] . Schematic thermo-gravimetric analysis (TGA); 1, fuel sample; 2, predefined reaction gas; 3, external heating; 4, balance; 5, gas sampling.…”

Section: Drop-tube Furnacementioning

confidence: 99%

Suitability of pulverised coal testing facilities for blast furnace applications

Bösenhofer

Wartha

Jordan

et al. 2019

Ironmaking & Steelmaking

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Identifying coals suitable for blast furnace injection has become increasingly important due to rising injection rates. This review of traditional pulverised coal reactivity testing equipment reveals that no agreed-upon evaluation standard exists and that different reactor types are employed for testing. Therefore, reference blast furnace conversion conditions are defined, followed by a discussion of their influence on the coal conversion process as illustrated by conceptual conversion models. Critical process parameters are temperature, heating rate and pressure, while other effects can be calibrated. Evaluating the currently employed test equipment with regard to these process parameters shows that only specially designed drop-tube furnaces and flow reactors provide conversion conditions near to blast furnace conditions. For consistent injection coal testing, special reactors complying with the previously defined critical process parameters must be established.

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“…Direct combustion as a main manner of the utilization of coal, which suffers a high energy penalty for carbon capture and a low energy efficiency [2], requires further improvement. Recently, pulverized coal has been widely used in steel and power plants for improving the burnout of coal, although this technology suffers from separation, crushing, grinding from the raw coal, and pipe blockage issues during the transportation of the pulverized coal [3][4][5][6][7]. Moreover, the need for reduced greenhouse gas emissions has spurred the development of clean coal technology, such as chemical looping combustion (CLC) [8], integrated gasification combined cycle (IGCC) [9], multi-stage coal gasification (MSCG) [10], and so on.…”

Section: Introductionmentioning

confidence: 99%

An Improved Comprehensive Model of Pyrolysis of Large Coal Particles to Predict Temperature Variation and Volatile Component Yields

Zhou

Huo

et al. 2019

Energies

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In this work, an improved comprehensive model was developed for large coal particles to predict temperature variation and volatile component yields. The kinetics model of volatile component yields, where the volatile matters were assumed to comprise nine species, was combined with heat transfer model. The interaction between volatile yield and heat transfer during pyrolysis of large Maltby coal particles was investigated. An apparent temperature difference has been observed between the surface and core of particles at the initial heating stage. The non-uniform temperature distribution inside coal particles causes non-simultaneous volatile yields release from the surface and core area. The volatile release occurs after the coal temperature rises higher than 350 °C, and its yield steeply increases within the temperature range of 450–520 °C. The peak of volatile release rate corresponds to about 485 °C due to the rapid release of tar and H2O. The tar is almost completely released at around 550 °C. With the increasing particle size, the difference in temperature and volatile yield between the surface and core increases at the end of heating. The results are expected to provide insights into the interaction between heat transfer and volatile yields during pyrolysis of large coal particles.

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Evaluation of combustion behaviour of coal blends for use in pulverized coal injection (PCI)

Cited by 34 publications

References 17 publications

Investigating char agglomeration in blast furnace coal injection

Investigating char agglomeration in blast furnace coal injection

Suitability of pulverised coal testing facilities for blast furnace applications

An Improved Comprehensive Model of Pyrolysis of Large Coal Particles to Predict Temperature Variation and Volatile Component Yields

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