High temperature gasification of coal under severely product inhibited conditions: the potential of catalysis

Weeda, M.; Tromp, P.J.J.; Linden, Bart van der; Moulijn, Jacob A.

doi:10.1016/0016-2361(90)90229-j

Cited by 11 publications

(7 citation statements)

References 7 publications

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“…Combustion-supporting agent could improve pulverized coal combustion characteristics, having oxidation of combustion-supporting and catalytic cracking effects, decreasing the ignition temperature of pulverized coal, advancing burnout temperature, shortening the time of burnout temperature. Unfortunately, the effect of combustion-supporting agent is reduced without alkali metal [4,5] . But also, the decomposed products of combustion-supporting agent, bringing a certain hidden danger.…”

Section: The Conventional Methods Of Increasing Pulverized Coal Injecmentioning

confidence: 99%

Research on Preheating Pulverized Coal to Ameliorate the Blast Furnace Coal Injection

Liu¹,

Chun-zhao²,

Wang³

et al. 2013

Proceedings of the 2012 International Conference on Automobile and Traffic Science, Materials, Metallurgy Engineering

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Pulverized coal injection of blast furnace is the important means of lowering ironmaking cost. It is a focus problem to improve the pulverized coal injection rate of blast furnace. However, improve the pulverized coal combustion rate has became a bottleneck of coal injection rate because of the contradiction between unburned pulverized coal and BF smooth operation. Basis of traditional technique, a new method by preheating pulverized coal to improve the pulverized coal combustion rate has been studied. Research shows that preheating pulverized coal can promote the pulverized coal combustion ratio, and reduce the heat loss of pulverized coal in BF through preheating pulverized coal.

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Section: The Conventional Methods Of Increasing Pulverized Coal Injecmentioning

confidence: 99%

Research on Preheating Pulverized Coal to Ameliorate the Blast Furnace Coal Injection

Liu¹,

Chun-zhao²,

Wang³

et al. 2013

Proceedings of the 2012 International Conference on Automobile and Traffic Science, Materials, Metallurgy Engineering

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“…However, dolomite receives attention because in many instances decrepitation occurs as well as decomposition (234). It was also noted that grinding the dolomite showed a gradual loss of the cation-ordering characteristic when a new phase of lower ordering appeared (255). Wiedemann they have adsorbed; then a dehydroxylation process takes place to produce a metastable form, and finally, a recrystallization usually occurs just above 1000 °C.…”

Section: Minerals and Energy-related Topicsmentioning

confidence: 99%

“…(251-254). The C02 gasification of coal was examined using TG with K2C03 as catalyst (255). A combination of mass spectrometry with TG is used by Szabo et al (256) to characterize file behavior of various coals on heat treatment The high-pressure DTA unit has proved useful in studying the liquefaction of coal (257).…”

Section: Minerals and Energy-related Topicsmentioning

confidence: 99%

Thermal analysis

Dollimore¹

1992

Anal. Chem.

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“…Επιπλέον, το ανθρακικό κάλιο (K 2 C0 3 ) καταλύει όχι μόνο την εξαερίωση με C0 2 αλλά και την εξαερίωση με ατμό (Η 2 0), οξυγόνο (0 2 ) και υδρογόνο (Η 2 ). Στην διεθνή βιβλιογραφία υπάρχει δημοσιευμένος σημαντικός αριθμός εργασιών και αποτελεσμάτων [181,252,256,263,279,282,289,296,309,310,[331][332][333][334][335][336][337][338][339][340][341][342][343][344][345][346][347][348] που αφορούν την καταλυτική επίδραση του ανθρακικού καλίου στην εξαερίωση ανθράκων και εξσνθρακωμάτων.…”

Section: Iv43 επίδραση του καταλύτη K 2 C0unclassified

“…Οι Weeda et al [344] μελέτησαν την δραστικότητα τριών διαφορετικών ανθράκων κατά την εξαερίωση με CO2, παρουσία καταλύτη K 2 CÓ 3 που προστέθηκε με εμποτισμό. Πραγματοποιήθηκαν ισοθερμοκρασιακά και μη πειράματα σε θερμοζυγό.…”

Section: κεφάλαιο IV εξαερίωση άνθρακα με C0unclassified

Εξαερίωση Ελληνικών Λιγνιτών Και Εξανθρακωμάτων Με Διοξείδιο Του Άνθρακα Και Υδρογόνο

Σκόδρας¹

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Gasification of Greek lignites and chars with carton dioxide and hydrogen was investigated by two parallel and complementary systems: non-isothermal thermogravimetry coupled with gas chromatography and infra -red analyser (TGA-GC-NDIR) and isothermal gasification in turbular reactor. The main issues studied within this work were: (a) non-isothermal C0 2 gasification of lignites and chars (b) catalytic and non-catalytic isothermal lignite -C0 2 gasification (c) two stage gasification (lignite hydropyrolysis and C0 2 gasification of the resulting chars) (d) the effect of the inherent inorganic matter on the hydropyrolysishydrogasification of lignites and on the C0 2 gasification of lignites and charsNon-isothermal investigations were mainly focused on the effect of operating conditions on C0 2 gasification weight loss, rates and yields. Parameters investigated included particle size (106 -1000 pm), heating rates (5 -100°C/min), C0 2 partial pressures (up to 1 atm) and the pre-charring conditions.The simultaneous determination of lignite weight loss and gaseous product distribution during non-isothermal TGA analysis employed here, provided a rational and detailed examination of the phenomena involved and permitted optimum selection of temperature regions for further investigations. Lignite behaviour during non-isothermal C0 2 gasification is characterised by the existence of two temperature regions that control conversions and yields, which however are not clearly distinguished. The first stage (pyrolysis, under 600 -650°C) is accompanied by volatiles evolution, fast weight decrease and formation of carbon oxides as well as light and heavy (mainly tars) hydrocarbons. Conversions in this region amount to -40% w/w of lignite on dry ash free basis (daf). During the second stage (C0 2 gasification) the heterogeneous Boudouard reaction (char -C0 2 ) dominates, accompanied by fast weight decrease and CO production. Traces of hydrocarbons are also produced in this stage coming from the remaining volatiles strongly bounded in the lignite structure. In this region lignite conversion reaches up to ~56% w/w daf. Lignite is found quite reactive with C0 2 and, thus, almost complete conversion is achieved by the end of the non-isothermal test. For the granulomeres studied (106 -1000 μιτι), the gasification rate and product yields are independent of particle size, thus lignite -C0 2 gasification does not suffer from mass transfer limitations. Although high heating rates result in increased weight loss and CO formation rates, total weight loss and CO yield decrease due to the reduction of solid residence time (i.e. reaction time). C0 2 partial pressure is a significant C0 2 gasification parameter over 600 -650°C (gasification region), where weight loss and CO formation rates increase significantly with P C o 2 -Thermal pre-treatment of lignite affects both C0 2 gasification regions. Increased pre-charring extend reduces weight loss and CO formation rates in the pyrolysis stage. In contrast, weight loss and CO formation rates are in...

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High temperature gasification of coal under severely product inhibited conditions: the potential of catalysis

Cited by 11 publications

References 7 publications

Research on Preheating Pulverized Coal to Ameliorate the Blast Furnace Coal Injection

Research on Preheating Pulverized Coal to Ameliorate the Blast Furnace Coal Injection

Thermal analysis

Εξαερίωση Ελληνικών Λιγνιτών Και Εξανθρακωμάτων Με Διοξείδιο Του Άνθρακα Και Υδρογόνο

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