Novel Catalytic Process for Flue Gas Conditioning in Electrostatic Precipitators of Coal-Fired Power Plants

Abstract

One of the most important environmental protection problems for coal-fired power plants is prevention of atmospheric pollution of flying ash. The ash particles are typically removed from flue gases by means of electrostatic precipitators, for which the efficiency may be significantly increased by lowering the resistance of fly ash, which may be achieved by controlled addition of microamounts of sulfur trioxide (SO 3 ) into the flue gases. This paper describes the novel technology for production of SO 3 by sulfur dioxide (SO 2 ) oxidation using the combined catalytic system consisting of conventional vanadium catalyst and novel platinum catalyst on the base of silicazirconia glass-fiber supports. This combination provides highly efficient SO 2 oxidation in a wide temperature range with achievement of high SO 2 conversion. The performed pilot tests have demonstrated reliable and stable operation, excellent resistance of the novel catalytic system to deactivation, and high overall efficiency of the proposed process. The scale of the plant was equivalent to the commercial prototype; therefore, no further scale-up of the oxidation process is required.

Properties of platinum-containing glass-fiber catalysts in the SO2 oxidation reaction

“…Notably, the conventional vanadia catalyst, also tested in parallel to GFC in these experiments, showed a significant deactivation, especially for the catalyst samples from some parts of the pilot reactor volume, where the operation temperature was lower than 400°C [9].…”

“…The pilot batch of the 0.01-0.02 % Pt-Zr/Si-GFC (sample No. 4) was tested in the stream of the real gases of the commercial sulfuric acid plant [9]. The lifetime tests were realized under the following conditions: the reaction gas flow rate was 100 st.m 3 /h, the initial SO 2 content was 6-8 % vol., and the inlet gas temperature was 400°C.…”

Investigation of the internal structure, fluid flow dynamics and mass transfer in the multilayered packing of the glass fiber catalyst in the pilot reactor for sulfur dioxide oxidation

“…Для испытаний использовался СВК с массовым содержанием платины около 0,02…0,03 %, продемонстрировавший свою высокую эксплуатацион-ную стабильность и повышенную активность в низкотемпературной области [10][11][12][13]. Носитель катализатора был выполнен в виде стеклоткани, сплетен-ной из пучков, каждый из которых состоял из трех нитей (рис.…”

“…На сегодняшний мо-мент наибольшее распространение в практических работах и исследованиях получили стекловолокнистые катализаторы (СВК) [3,4]. В качестве активных компонентов в СВК могут использоваться благородные металлы (Pt, Pd) [3][4][5][6][7][8][9][10][11][12][13] или оксиды переходных металлов [14][15][16][17][18], благодаря чему такие ката-лизаторы имеют весьма широкий спектр потенциальных применений на практике.…”

Pressure drop and mass transfer in the structured cartridges with fiber-glass catalyst

“…The first systematic research of GFCs, containing noble metals (first of all -Pt and Pd) as active components, was performed in the Boreskov Institute of Catalysis [10][11][12][13][14][15][16]. The mentioned research has led, in particular, to creation of commercial Pt-containing catalysts IC-12-S102, successfully applied in the commercial process of catalytic incineration of organic compounds in waste gases at Nizhnekamskneftekhim plant [17], and IC-12-S111, used in commercial units for abatement of exhaust gases from stationary diesel generators [18].…”