By K.K. Chatterjee
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Extra info for Uses of Energy Minerals and Changing Techniques
Glass-making furnace, steel-making furnace) and also for starting large diesel generators used in factories. Any coal including low-grade high-ash ones, can be used for generation of producer gas. 20 USES OF ENERGY, MINERALS AND CHANGING TECHNIQUES Sometimes, instead of air, a mixture of air and steam is used. It enables up to 75% of the nitrogen of the coal to be converted into ammonia (NH3) which can be recovered as ammonium salts. 9. Carbureted Water Gas A mixture of 80% coal gas and 20% water gas is sometimes used.
I) Insulation bricks: In such bricks, the raw materials are required to be subjected to a very high temperature treatment for chemical transformation. Since fly ash has already undergone that treatment in the boiler, it may prove to be suitable for making such bricks. In India, Bharat Heavy Electricals Limited (BHEL), Tiruchirapalli is reported to have developed a process. (ii) Building bricks: This is by far the most promising and most talked about area of fly ash utilization. Pioneering research was carried out in Central Fuel Research Institute (CFRI), Neyveli Lignite Corporation (NLC) and National Council of Cement & Building Materials (NCBM) in India.
The smoke that is generated due to burning and oxidation of carbon, is unavoidable (otherwise heat will not be generated). But attempts are made to minimize the smoke produced due to burning of the volatile matter. At the same time, since it is the volatile matter that ignites first and produces the necessary fire to initiate the process of burning of the carbon in coal, too low a volatile matter content COAL 21 is not desirable. Due to this reason, hard coke or anthracite prevents the coal from catching fire quickly.