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Studies on the carbonation of Czatkowice limestone in Calcium Looping process

Tomaszewicz G., Kotyczka-Morańska M., Plis A.

Polish Journal of Chemical Technology

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2016

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Vol. 18, nr 2

53--58

EN

The growing demand for the reduction of anthropogenic CO2 emissions has stimulated the development of CO2 capture methods. One of the best capture methods comprises the calcium looping process, which incorporates calcium-based sorbents during the calcination and carbonation cycles. Czatkowice limestone may be considered to be a prospective chemical sorbent for the calcium looping process because of its formation characteristics. This paper addresses the thermogravimetric studies conducted under varying conditions of temperature and various concentrations of CO2 during the carbonation cycles. Moreover, a kinetic analysis of the carbonation stage was performed for the calcined sample at varying temperatures. The kinetic parameters for calcination and diffusion were determined. In addition, there was an increase in the concentration of CO2 with an increased carbonation conversion. The research results demonstrate that in further cycles of carbonation/calcination, the calcium sorbent reaches a higher rate of carbonation conversion with increased levels of CO2

2

Application of modified calcium sorbents in carbonate looping

Kotyczka-Moranska M., Tomaszewicz G.

Physicochemical Problems of Mineral Processing

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2014

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Vol. 50, iss. 1

217--224

EN

Reduction of CO2 emission is essential. In this paper, a study of the behaviour of modified Polish CaO-based sorbents during calcium looping cycles has been discussed. All the related tests were conducted using the Netzsch STA 409PG Luxx thermogravimetric analyser. Samples with a weight of ms=10.0±0.1 mg were placed in an Al2O3 crucible. The calcium looping processes were performed at the carbonation temperature of 650°C and the calcination temperature of 900°C. Additionally, calcinationcarbonation cycles with different gas flows were examined. The authors investigated the influence of CO2 concentration and total gas flow on the carbonation conversion. Sorbents were studied by TG and porosimetry analysis.

3

Application of polish calcium sorbents in carbonate looping

Kotyczka-Moranska M., Tomaszewicz G.

Physicochemical Problems of Mineral Processing

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2013

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Vol. 49, iss. 1

111--120

EN

The purpose of this work was the investigation of behaviour of three Polish CaO-based sorbents during calcium looping cycles. All investigations were conducted with a Netzsch STA 409PG Luxx thermogravimetric analyser. Samples weighing ms = 10.0(1) mg were placed in an Al2O3 crucible. The calcium looping processes were performed at two carbonation temperatures (650°C and 680°C) and three calcination temperatures (880°, 900° and 920°C). Additionally, calcination-carbonation cycles with different gas flows were explored. We investigated the influence of CO2 concentration and total gas flow on carbonation conversion.

4

Badania nad wybranymi właściwościami sorbentów w procesie usuwania CO2 metodą chemicznej pętli wapniowej

Tomaszewicz G., Kotyczka-Morańska M.

Karbo

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2013

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Nr 1

86--93

PL

Chemiczna pętla wapniowa w ostatnich latach staje się dużą nadzieją na ekonomicznie uzasadnione usuwanie CO2 ze spalin i innych gazów przemysłowych. W pracy przedstawiono badania nad sorbentami do zastosowań w chemicznej pętli wapniowej. Porównano zachowanie: kamienia wapiennego, modyfikowanego kamienia wapiennego do odsiarczania spalin oraz wygrzanego w temperaturze 1000°C kamienia wapiennego, w cyklicznej pętli wapniowej przy wykorzystaniu termograwimetru. Dokonano analizy FTIR powierzchni sorbentów, rozkładu porów oraz wpływu warunków prowadzenia procesu w chemicznej pętli wapniowej.

EN

Recently, the calcium looping has arisen as an economically justified technology for CO2 capture from exhaust and other industrial gases. The paper presents the comparison of calcium looping behavior of raw limestone, modified limestone for desulphurization of flue gases, and limestone preheated in 1000°C in cyclic calcium looping with the use of a thermogravimeter. The FTIR analysis was performed with regard to the surface of sorbents, distribution of pores and the impact of the process conduction in chemical calcium looping.

5

Comparison of different methods for enhancing CO2 capture by CaO-based sorbents. Review

Kotyczka-Moranska M., Tomaszewicz G., Labojko G.

Physicochemical Problems of Mineral Processing

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2012

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Vol. 48, iss. 1

70-90

EN

CaO-based sorbent looping cycle, i.e. cyclic calcination/carbonation, is one of the most perspective technologies for CO2 capture during coal combustion and gasification processes. This study deals with different methods of enhancing CaO based sorbents activity. We also present the results of our research on the use of dolomite from Siewierz and limestone from Czatkowice. The limestone carbonation conversion in the initial cycles is worse than pure CaO, but its carbon dioxide capture parameters are better than the parameters of dolomite. Sintering appears to play a significant role in the decay of CaO-based sorbents. The annealing effect for different sorbents was investigated. Tests were performed for calcium acetate, calcium hydroxide, dolomite from Siewierz and pure CaO.