Effect of CaSO4 on the structure and use of Ca(OH)2/fly ash sorbents for SO2 removal

Fernández, J.; Renedo, M. J.; Pesquera, Alfonso; Irabien, Ángel

doi:10.1016/s0032-5910(01)00263-7

Cited by 45 publications

(29 citation statements)

References 19 publications

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“…As is the case in coal combustion, it is necessary to adsorb and control SO x emission during co-combustion. Many kinds of adsorbents have been adopted in the past, particularly calcium-based adsorbents [12][13][14][15][16][17][18][19][20][21][22][23][24][25]. The first generation of calciumbased scrubbers (a type of FGD) was made in Great Britain in 1920.…”

Section: Introductionmentioning

confidence: 99%

“…Limestone (in the form of CaO and Ca(OH) 2 in some cases) is commonly added as adsorbent to coal and coal/co-fuel blend combustions, both for pulverized and briquetted coal [19][20][21][22][23][24][25]. There is also a combined adsorbent of Ca(OH) 2 /fly ash [21].…”

Section: Introductionmentioning

confidence: 99%

“…There is also a combined adsorbent of Ca(OH) 2 /fly ash [21]. It has been found that Ca(OH) 2 shows better desulfurization capabilities than limestone because of its lower calcination temperature.…”

Section: Introductionmentioning

confidence: 99%

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Sulfur Removal in Bio-Briquette Combustion Using Seashell Waste Adsorbent at Low Temperature

Mahidin

Gani

Muslim

et al. 2016

J. Eng. Technol. Sci.

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Abstract. Presently, biomass is mostly utilized as co-fuel in coal combustion in view of energy diversification and emission reduction. However, since the coal content of bio-briquettes is high (up to 80% in this study), gas emissions such as those of SO x still occur. Therefore, the introduction of SO 2 adsorbent is common in coal briquette or bio-briquette combustion. A calcium-based material is usually used for this goal. The aim of this study was to observe the effects of desulfurization temperature and Ca/S ratio (Ca = calcium content in adsorbent; S = sulfur content in coal and biomass) on desulfurization efficiency and kinetics. The ratio of coal to biomass (palm kernel shell/PKS) was fixed at 90:10 (wt/wt) and the ratios of Ca to S were varied at 1:1, 1.25:1, 1.5:1, 1.75:1 and 2:1. The mixtures of coal, PKS and adsorbent were briquetted at a molding pressure of 6 ton/cm 2 with Jatropha curcas seeds and starch mixture as binding agents. Desulfurization was performed within a temperature range of 300 to 500°C for 720 seconds at an airflow rate of 1.2 L/min. The results showed that the highest desulfurization efficiency (90.6%) was associated with the Ca/S ratio of 2:1 and temperature of 400°C. Moreover, the highest reaction rate constant of desulfurization was 0.280 min -1 .

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Sulfur Removal in Bio-Briquette Combustion Using Seashell Waste Adsorbent at Low Temperature

Mahidin

Gani

Muslim

et al. 2016

J. Eng. Technol. Sci.

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“…BET surface area for coal fly ash, calcium oxide (CaO), S21 (maximum value of absorbent BET surface area prepared from water hydration) 9 and commercial absorbents (typically calcium hydroxide)9 are given in Table 2. The significant increase in the specific surface area of the hydrated coal fly ash absorbent as compared to the raw materials suggests that the mixing of the above-shown reagents resulted in the formation of certain compounds with a relatively higher surface area.…”

Section: Resultsmentioning

confidence: 99%

“…The influence of the absorbent micro-structural properties such as the BET specific surface area, which is one of the major parameters affecting the efficiency of the absorbent in removing SO 2 , has been mentioned by a number of researchers 1,3,[5][6][7][8][9][10] . Recently, Ishizuka et.…”

Section: Introductionmentioning

confidence: 99%

Removal of Sulfur Dioxide From Flue Gas Using Absorbent Prepared by Water and Steam Hydration

Teong

Mohamed

Bhatia

2017

AJSTD

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Active absorbent for flue gas desulfurization was prepared from coal fly ash, calcium oxide (CaO) and calcium sulfate (CaSO 4 ) by hydro-thermal process; steam and water hydration. The absorbents were examined and compared for its micro-structural properties. The experiments were conducted based on Design of Experiments (DOE) according to 2 4 factorial design. The effect of various absorbent preparation variables such as hydration period (Factor A), ratio of CaO to fly ash (Factor B), amount of calcium sulfate used (Factor C) and drying temperature (Factor D) towards the BET surface area of the absorbent were studied. The BET surface area of the absorbent was in the range of 12.9-169.3 m 2 /g. Fisher's test showed that there is a strong influence of factor A, B and D towards the absorbent surface area, while its dependence on factor C is negligible. Comparison between absorbents prepared from water and steam hydration showed that the BET surface area of absorbents prepared from water hydration gives a higher surface area, but at a lower rate. The optimum BET surface area for the prepared absorbent 169.3 m 2 /g, was obtained at the following absorbent preparation variables using water hydration; hydration period of 24 hours, ratio of CaO to fly ash of 1:2, CaSO 4 amount of 3g and drying temperature of 200˚C.

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Oil Palm Ash/Ca(OH)₂/CaSO₄ Absorbent for Flue Gas Desulfurization

2005

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The preparation, optimization and activity of active absorbent prepared from oil palm ash for the removal of SO 2 in flue gas from combustion systems were investigated. The absorbent was prepared from oil palm ash, calcium hydroxide and calcium sulfate using a water hydration process. A Central Composite Design (CCD) was used to study the influence of various absorbent preparation variables ± hydration period, amount of oil palm ash, and amount of CaSO 4 ± on the BET (Brunauer-Emmett-Teller) specific surface area of the resulting absorbent. The surface areas of the absorbents obtained were in the range of 18.7±147.2 m 2 /g. It was found that all three absorbent preparation variables studied have a significant positive influence on the BET surface area of the resulting absorbent. An empirical model was then developed to correlate the three absorbent preparation variables to the BET surface area of the resulting absorbent. The model showed significance at a confidence level of 95 % using Analysis of Variance (ANOVA). Based on the empirical model, a maximum specific surface area of 128.6 m 2 /g exists within the range of the experimental variables investigated. The hydration conditions that result in the maximum surface area are a hydration period of 10 h, amount of oil palm ash 15.0 g, and amount of CaSO 4 2.7 g. Experimental validations of these predicted optimum hydration conditions gave surface areas in the range of 125.9±129.5 m 2 /g. These results are in excellent agreement with the predicted value. In addition, desulfurization activity tests showed that the absorbent derived from oil palm ash/Ca(OH) 2 /CaSO 4 exhibited a higher desulfurization capacity compared to its starting materials.

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Effect of CaSO4 on the structure and use of Ca(OH)2/fly ash sorbents for SO2 removal

Cited by 45 publications

References 19 publications

Sulfur Removal in Bio-Briquette Combustion Using Seashell Waste Adsorbent at Low Temperature

Sulfur Removal in Bio-Briquette Combustion Using Seashell Waste Adsorbent at Low Temperature

Removal of Sulfur Dioxide From Flue Gas Using Absorbent Prepared by Water and Steam Hydration

Oil Palm Ash/Ca(OH)₂/CaSO₄ Absorbent for Flue Gas Desulfurization

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Effect of CaSO4 on the structure and use of Ca(OH)2/fly ash sorbents for SO2 removal

Cited by 45 publications

References 19 publications

Sulfur Removal in Bio-Briquette Combustion Using Seashell Waste Adsorbent at Low Temperature

Sulfur Removal in Bio-Briquette Combustion Using Seashell Waste Adsorbent at Low Temperature

Removal of Sulfur Dioxide From Flue Gas Using Absorbent Prepared by Water and Steam Hydration

Oil Palm Ash/Ca(OH)2/CaSO4 Absorbent for Flue Gas Desulfurization

Contact Info

Product

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Oil Palm Ash/Ca(OH)₂/CaSO₄ Absorbent for Flue Gas Desulfurization