Simultaneous NO sub x /SO sub 2  removal by the dry injection of lime-urea hydrate

Muzio, L.J.; Himes, Richard; Thompson, Raymond

doi:10.2172/7178285

Cited by 3 publications

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“…However, their cost is still quite high, and in the case of CMA an excessive amount of inert material must be transported together with the active part of the sorbent. On the other hand, satisfactory results have been found during the injection at high temperatures of calcium hydroxides modi fied with several additives for sulfur removal at oxidizing conditions ( − ). To test if it was possible to prepare a cheap sorbent or to improve the sulfur removal capacity of the worst natural sorbents without excessive cost, some calcium hydroxides modified with several additives were prepared following the method above detailed.…”

Section: Resultsmentioning

confidence: 99%

“…The third possibility consists of the use of modified sorbents. Calcium hydroxides modified with some additives, as for example calcium lignosulfonate, have been satisfactorily tested in boiler injection for sulfur retention applications at oxidizing conditions ( − ). The amount of additive in the modified sorbent is very low, under 5 wt % in all cases.…”

Section: Introductionmentioning

confidence: 99%

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Effectiveness of Natural, Commercial, and Modified Calcium-Based Sorbents as H₂S Removal Agents at High Temperatures

Garcı́a-Labiano

Diego

Adánez

1998

Environ. Sci. Technol.

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Coal gas desulfurization is one of the most important gas cleaning steps previous to its use in a gas turbine in integrated gasification combined cycle (IGCC) systems. In this work, 12 different calcium based materials, both natural, commercial and modified with several additives, were tested in a drop tube reactor as potential H2S removal agents at high temperatures and reducing conditions. Three limestones and a dolomite were selected by their different natures and reactivities. The commercial products used were calcium hydroxide, calcium acetate (CA), and calcium magnesium acetate (CMA). Moreover, two limestones of different nature and reactivity were used as starting material to prepare several calcium hydroxides modified with calcium lignosulfonate (LGS) and calcium acetate (CA). An important improvement in sulfur removal respect to the sorbent prepared without additives was achieved when using the modified sorbents. However, the highest sulfur removal was obtained with CA and CMA sorbents due to their ability to form highly porous cenospheres of thin walls. H2S capture up to near the thermodynamic equilibrium was achieved with dry-injection of the CA and CMA at furnace gas temperatures of about 1000 and 800 °C, respectively, a Ca/S molar ratio of 2, and 0.8 s of residence time.

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Section: Resultsmentioning

confidence: 99%