SO2 Removal in the Filter Cake of a Jet-Pulsed Filter: A Combined Filter and Fixed-Bed Reaction Model

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• 作者：Andreas Kavouras ; Bernd Breitschaedel ; Gernot Krammer ; Aurora Garea ; Jose A. Marques ; and Angel Irabien
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2002
• 出版时间：October 30, 2002
• 年：2002
• 卷：41
• 期：22
• 页码：5459 - 5469
• 全文大小：204K
• 年卷期：v.41,no.22(October 30, 2002)
• ISSN：1520-5045

文摘

Jet-pulsed filters are frequently used to separate fine solid particles from gas streams. An examplefor the application of the filter as both a solid separator and a fixed-bed reactor is a dry flue gascleaning process, where the dry solid sorbent Ca(OH)₂ forms a filter cake that captures a majorpart of the SO₂ and HCl out of the flue gas. One important phenomenon concerning the formationof the filter cake on jet-pulsed filters is imperfect cake removal. Here a jet pulse tears off theentire filter cake from only a fraction of the exposed filter area, and only part of the total filterarea is subjected to the jet-pulse cleaning. This property of jet-pulsed filters has a great influenceon the chemical reaction simulation between gas and solid in the filter cake because the gasvelocity through the cake, the cake thickness, and the residence time distribution of the solidforming the cake differ widely over the entire filter area. A recently developed filter model, inwhich different classes of cake thicknesses are understood to result from different cakegenerations, is used to determine the distributions of cake thickness, gas velocity, and residencetime of the solid over the filter area. With the combination of the filter model and a fixed-bedreaction model using an empirical kinetic equation, the SO₂ removal in the fixed bed of thefilter cake can be simulated. The combined filter and reaction model was successfully validatedwith an experiment from a pilot plant for dry flue gas cleaning, where solid Ca(OH)₂ was usedas a sorbent. A sample of the partially reacted sorbent from the pilot plant had been used toderive the empirical kinetic equation for SO₂ sorption in fixed-bed laboratory experiments.