International Journal of Energy and Environmental Research Vol.4, No.3, pp.27-36, August 2016 ___Published by European Centre for Research Training and Development UK (www.eajournals.org) 27 ISSN 2055-0197(Print), ISSN 2055-0200(Online) THE THERMAL BEHAVIOR OF THE COAL-WATER- FUEL (CWF) Alaa M. Musalam and Abdel Fattah A. Qaraman Scientific Research Department, Israa University, Gaza, Palestine. ABSTRACT: Large deposits of coal in the world enable to utilize in composite fuel with water and diesel, which help reducing the demand of petroleum fuels. This composite used in different thermal machines, especially in plant combustion engines with no change in the fuel combustion technology. A carbon powder containing small molecules dissolved in water in - coal-water- fuel (CWF) -is good fuel for applying in large capacity engines in electrical plants. This paper gives necessary information about obtaining of water-coal emulsion including its physical properties and focuses on the action of sea water vapor in CWF. The experimental tests indicate a higher thermal efficiency of engine fueled by water–coal-fuel emulsion than engine fueled by black oil lonely. The increased emission of CO2 or NOx can be reduced in the plants simply by chemical reduction. The paper explains the appropriate ratios leading to effective combustion process. This paper is a certain challenge for finding a new fuel sources as a competition for crude oil. The thermal behavior of different ratios of composite fuel were measured in thermo-gravimetric station under normal atmosphere pressure, to determine the appropriate ratio of CWF. The results show that the addition of 30% sea water as vapor in CWF decrease NOx and gives high thermal efficient. KEYWORDS: Coal, Water, Fuel, CWF, Sea Water, Vapor, SLBS, Carbamide. INTRODUCTION Fluctuations in prices of petroleum products leads to influence the economy of poor countries, especially in the non-oil-producing countries. In order to decrease the dependence of numerous countries on petroleum, many works have been done on heavy-duty diesel engines fuelled by coal or water-coal emulsion (Nelson et al., 1985). The works done by General Electric on two cylinder test engine fuelled by micronized coal-water-slurry (CWS) with very small diameter of pulverized coal (d<5 μm) was very successful (Mitianiec, (2016)). Many problems appear with applying of CWS predominant of coal atoms in the fuel, such engines emit also higher amount of carbon dioxide to atmosphere in comparison to engines working on diesel oil. The main benefits from CWS is cheaper fuel and high enough caloric and using coal to fuel diesel engines could provide a secure and efficient power generation technology. The first practical use of the CWS as a fuel in power plants is composed by adding coal powder in the fuel oil to alleviate of consumption. Which will maintaining combustion technology without change (G. Stogney, 1991). An interesting potential market for CWS has been found to exist in the European Economic Community and the industrial, the utility and the residential/commercial sectors allow the replacement of substantial amounts of traditional oil-derived and gaseous fuels with CWS (B. Variali,1989). The coal is dissolved in the diesel fuel and water that leads to speed coal combustion and converts it into a gas .Combustion of surfaces of coal molecules takes place together with water evaporation (Wilson, ,2006, Kalpesh , 2012).