NDLI: Activation and reactivity of Estonian oil shale cyclone ash towards SO$

Content Provider	Springer Nature Link
Author	Kaljuvee, T. Trass, O. Pihu, T. Konist, A. Kuusik, R.
Copyright Year	2014
Abstract	Electricity production in Estonia is based mainly on the pulverized firing of low-grade local fuel—Estonian oil shale—and it is concentrated mainly in two big power plants, the Balti and the Eesti power plants. Estonian oil shale is characterized by a low calorific value (8–10 MJ kg$^{−1}$) and a high content of mineral matter (65–70 %, carbonates and sandy-clay minerals in about equal amounts). The sulphur content is around 1.5 %. At the Eesti Power Plant, the Alstom semi-dry DeSO$_{ X }$ system was recently installed on four power units by 180 MW$_{el}$ each to guarantee deeper binding of SO$_{ x }$ from flue gases. Commercial lime in addition to oil shale ash is used there as a binding agent. Considering that cyclone ash there contains about 20–25 % free CaO and its ability to bind acidic gases has been proved earlier, the idea to replace expensive commercial sorbent with ash was raised. Hence, activation of ash is needed. The aim of the present work was the comparative investigation of the efficiency of activated ashes and the commercial lime used in the DeSO$_{ X }$ system. Initial ash, dry ground and semi-dry ground ashes with two different amounts of water—5 and 7 % by mass—and commercial lime as sorbents for SO$_{2}$ binding were studied. The experiments for testing the reactivity of sorbents towards SO$_{2}$ binding were carried out with the Setaram Labsys 2000 thermoanalyzer under isothermal conditions. The model gaseous mixture used contained 1 mol% sulphur dioxide in nitrogen. The temperature was varied between 80 and 700 °C. A Pt-multiplate crucible was used with 80 ± 0.5 mg samples. The results obtained indicated that ash activation by semi-dry grinding increases noticeably the reactivity of it towards SO$_{2}$ binding, and as a result additional commercial lime will not be needed.
Starting Page	19
Ending Page	28
Page Count	10
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	121
Issue Number	1
e-ISSN	15882926
Language	English
Publisher	Springer Netherlands
Publisher Date	2014-12-04
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Flue gases Oil shale ash Pulverized firing Semi-dry grinding Sulphur dioxide capture Physical Chemistry Analytical Chemistry Polymer Sciences Inorganic Chemistry Measurement Science and Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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