Water and Energy Abstracts
Year : 2004, Volume : 14, Issue : 1
First page : ( 12) Last page : ( 12)
Print ISSN : 0021-1672.

20. In-furnace SO_X Absorption Systems for Steam Generators

Kant Rajni

(Water and Energy International, Vol. 60, No. 4, October-December 2003, pp. 12–20).

Abstract

Due to industrialisation and large scale expansion of thermal power generation, air pollution by oxide of sulphur (SO_X) may assume menacing proportions in future and its control either by post-combustion absorption systems or by in-furnace absorption systems may become necessary for all the steam generators of future thermal power stations and industries in India. In the fluidised bed combustion (FBC) technology based boilers burning solid fuels, the SO_X is absorbed in the furnace itself with added drastic reduction in NO_X emission. The atmospheric bubbling fluidised bed combustion (BFBC) and atmospheric circulating fluidised bed combustion (CFBC) boilers are being increasingly installed even for high ash low grade coal successfully. Pressurised fluidised bed combustion (PFBC) boilers which work in combined cycle are also being set-up but so far no installation burning high ash low grade coal (like Indian coals) has been designed and installed. CFBC boilers which have a proven better adaptability for low grade Indian coal would be ideal for utilisation of washery rejects and middlings at washeries and high ash coal at the pit-heads without causing air pollution problems. Coal gasification based hybrid generation system, i.e., topping cycles have SO_X absorption in the gasifier and also in constituent CFBC boiler, and a lot is expected by the development of this technology in future.

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Keywords

Pollution, Sulphur, Post-combustion, Absorption, In-furnace, FBC.

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