Community Research and Development Information Service - CORDIS


One of the actions recommended for protecting the environment is to reduce, at source, the production of waste, or unused by-products. The technique of desulphurizing furnaces by injecting lime or limestone increases the volume of combustion by-products. Recent studies have shown that desulphurization could be made more effective by recycling by-products, which contain significant quantities of desulphurizing agents that remain unused. Reactivating these products by hydration before recycling should increase the overall efficiency of these agents. In this project combustion by-products reactivated by the CERCHAR technique of hydration of ash rich in quick lime were used as desulphurizing agents. Secondly, products reactivated using this technique were compared with by-products and desulphurizing agents that had not been reactivated. Since this study was proposed the problem of optimizing the use of limestone has evolved and can no longer be described in the same terms. Several arguments are no longer valid: in many cases extinguishing the ash serves no purpose. The only case in which extinguishing the ash may be beneficial is that of a coal very rich in sulphur and not auto-desulphurizing. It could be decarbonated in the furnace, the ash extracted, extinguished and re-injected in hydrated form as a desulphurizing agent.

Additional information

Authors: CERCHAR, Cerchar (FR)
Bibliographic Reference: EUR 17937 FR (1998) 47pp
Availability: Available from OOPEC Sales agents
ISBN: ISBN 92-828-4543-5
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