Survey on Methods for Analysis and Conservation of Hydrated Lime Particles Sampled in Flue Gas Cleaning Systems

Abstract

In terms of analyzing and modeling conditioned dry absorption, an unbiased view on the injected hydrated lime particles is needed. Multiple investigations on the reaction mechanisms are reported in the literature. Nevertheless, outstanding issues still exist as a necessary conservation in the time between the particle sampling and analysis as well as the suitability of the analyzing methods itself has been regarded only roughly yet. Thus, in this work TGA, XRD, and SEM-EDS were used for analyzing Ca(OH) 2 -CaCl 2 •2H 2 O-mixtures. TGA turned out to be inappropriate as the composition of the mixture changes during analysis. A cooling of the particle samples down to 277.15 K under air exclusion proved to be a sufficient conservation method for the time span between sampling and analysis.

Experimental Investigation of SO2 Removal from Flue Gases by Cleaning with Solution of Lime Suspension and Formic Acid

“…In this regard, a number of researchers [12][13][14][15][16][17][18][19][20][21][22] explored and developed a series of procedures for SO 2 reduction, in order to find the optimal and economic procedure. Having this in mind, the authors of this paper explored the possibility of the application of a solution of lime suspension and formic acid for the removal of SO 2 from flue gas since formic acid enhances the absorption process.…”

Basic Study of the Reaction of Calcium Hydroxide with Hydrogen Chloride Using Single Crystals

“…In this process, calcium hydroxide (Ca­(OH) 2 ) is sprayed into the gas and then accumulates on the bag filter, where it reacts with HCl gas. This gas–solid reaction has been investigated in many studies. − To fully utilize the Ca­(OH) 2 sorbent, the ideal final product is CaCl 2 or any of its hydrates. However, it is known that the reaction of Ca­(OH) 2 with HCl under actual bag filter conditions is complex. The reaction is considered to involve at least two steps with CaOHCl or its hydrate as an intermediate .…”