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Metal Casting Technologies : March 2005
Time has come to upgrade the quality of product and the productivity of cupola, the most popular conventional shaft type furnace to make Cast Iron. this paper examines the possibilities to fulfill the above criteria on removing the moisture from combustion air utilizing the post recuperative waste heat of flue gas as well as on generating the oxygen enriched hot blast on passing the air through PSA unit and recuperator successively. It has also searched the impact of moisture removal from combustion air and the effects of oxygen enrichment of the blast on the related system and product quality. KEY WORDS: Divided blast cupola, hot blast, Cast Iron, vapor absorption system, pressure swing adsorption system, recuperator, moisture removal, oxygen enrichment. 1. INTRODUCTION ecause of economy in installation and ease in operation, till date cupola is considered as the main melting unit in cast iron making processes. Global threat of environmental pollution and poor availability of low sulphur low ash coal have made its survival acute today. In the present era of globalization, energy conservation, higher productivity and better quality attainment of the product can only help the sustenance of this century old technology. With this aim in view, this paper presents an innovative model to bring about a radical change in the operational procedures of the cupola. 2. OBJECTIVE OF THE MODEL This model works on a hot divided blast cupola with the objective of: Lowering the moisture content of the blast On line enriching the oxygen percentage of the blast. An Innovative Model For Efficient Operation In Cupola By Navojit Basu, Bimal Chaudhuri and P.K. Roy 25 METAL Casting Technologies March 2005 B TECHNICAL FEATURE Chimney Vapour Absorption System Recuperator Cupola PSA Compressor Condensate Trap Buffer Tank Air Receiver Figure 1 : Flow diagram of the model MODEL COMPONENT This model, as shown in figure 1, includes: An air chilling unit with the facilities of: oAhigh pressure air compressor o An air chiller, operated on vapor absorption system o An air receiving tank with condensate trap Pressure Swing Adsorption (PSA) system to generate oxygen enriched blast Pressure Reducing Regulator to lower the high pressure of the blast within the operating limits of the cupola Recuperator to supply hot, oxygen enriched, controlled moisturized blast to the tuyeres of the cupola A divided blast cupola. 1