Laserfiche WebLink
Lyons Cement Plant <br />CKD Removal to Comply with NESHAP <br />January 2016 <br />US Environmental Protection Agency EPA NESHAP rule has established new Mercury -Hg limit of 55 <br />pounds per million ton of clinker. Lyons kiln will need a 40% reduction in mercury emissions <br />and a 50% reduction in hydrogen chloride emissions. Lyons must show compliance by <br />September 2016. <br />Technical and sustainability studies have shown that dust shuttling (CKD) is an effective way to <br />lower mercury and hydrogen chloride emissions at cement kiln stacks. Cemex in-house <br />experience indicates that effectiveness depends on how much mercury and hydrogen chloride <br />are adsorbed in the dust (Scrubbing process). <br />One way to ensure compliance and reduce the amount of dust shuttling is increasing mercury <br />adsorption by using sorbent injection. Trials completed at Lyons and other cement kilns have <br />shown that powder activated carbon injection is an effective sorbent to increase Hg capture in <br />CKD and comply with the NESHAP mercury limit and the kiln stack. Similarly, trials with <br />hydrated lime injection have shown that Hydrogen Chloride can be converted into Calcium <br />Sulphate and Calcium Chloride and therefore it can be taken out by removing CKD. Chemical <br />reactions include <br />Ca(OH)2(S) + 2HC1(g) __> CaCl2 (S) + 2H20(9) <br />Ca(OH)2(s) + S02(9)==> CaS03(s) + H2O (g) <br />Due to alkali content in CKD, Lyons already shuttles (landfill) some of the CKD when producing <br />low alkali clinker. <br />