Development of fluidized bed coal combustion system based on low grade coal for the supply of clean heat for Industrial use.

Abstract

Fluidized Bed Combustion is a technique partir.ularly applicable to the combustion of low grade fuels with high

ash nnd sulphur contents. This technique avoids slag forma- tion which fouls the ordinary coal combustion henrths. It also

reduces if not eliminates, the qu?ntity of sulphur in flue gases, which causes corrosion to the combustion and related equipments.

For this study, a pilot fluidized bed combustor along- with a heat recovery system was designed, fabricated in the

Workshop of PCSIR Laboratories, Lahore? The same was installed, commissioned and successfully operated on various indiq?nous coals. ?he combustor was subjected to a 72 hours continuous test operation in which no manufacturing of any component was noticed. Various materials were tested for their suitability as bed material but ultimately quartz was used for experiments work. Also, various coal, coal feeds rates and bed m?terials combustions were investiaated. Various dry absorbent for sulphur dioxide were investigated and it was established the complete removal of sulphur from flue gases was impossible evPn at high absorbent sulphur value.

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The theoretical baPis of the desian of fluidi?erl b?d used were experimently tested for their apolicahilitiPs.

An outline for fluidized bed combustion and hP?t reco- very system has been presented fer future guidance to the

identification of equipment units.