Paper Keywords: diesel compound agent
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? Abstract: The mechanism, research, preparation and application progress of compound diesel oil are systematically introduced.
? 1 overview
? Composite diesel oil is a water-in-oil (W/O) emulsion which is made by compounding water and diesel oil with compounding agent and compounding equipment. As early as 100 years ago, the technology of diesel mixing with water existed. However, due to the low level of diesel mixing technology at that time, the income was not obvious enough and the oil crisis was not prominent, the diesel mixing technology was in a slow development state. At the end of 1950s, due to the need of environmental protection and the oil crisis, the application technology of diesel blending was paid attention to. In 1970s, diesel blending technology entered the stage of practical development. Industrially developed countries such as the United States, the former Soviet Union and Japan. Diesel blending technology is being listed as a national key development and research project, and a lot of experiments and in-depth studies have been carried out on blending means, blending technology, blending device, surfactant, blending mechanism, combustion kinetics, wear and corrosion of internal combustion engine, standardization and commercialization. A large number of studies show that oil-water mixed fuel can greatly improve emission pollution and save fuel. At the same time, diesel oil mixed with water will not only corrode and increase the wear of internal combustion engine, but also play the role of cleaning agent, which can reduce the maintenance cost of internal combustion engine. At present, the number of professional institutions studying fuel blending technology in the world is unprecedented, and patent documents and academic papers have mushroomed. In Japan, America, Germany, etc. Diesel compounds have long been sold as commodities, and the third or fourth generation products have been developed. The H- 106 and H- 107 composite products produced by samit Company, which specializes in producing composite oil, are sold to Southeast Asian countries. Looking at the diesel water mixing technology in past lives, it has shown great vitality.
Principle and compound mechanism of energy saving and pollution reduction of compound diesel oil
2. 1 principle of energy saving and pollution reduction of composite diesel oil
2. 1. 1? Micro-explosion effect (secondary atomization)
? At present, most experts at home and abroad believe that the energy saving of composite diesel oil is due to tiny water droplets in emulsion? Micro explosion or secondary atomization caused by the effect. Micro-explosion is caused by the vaporization of two or more liquids with different volatility at high temperature. Due to the limited diffusion speed of liquid, the liquid with poor stability will cover the surface, which will lead to the rapid rise of droplet temperature. Once the temperature reaches the overheating limit of a component, micro-explosion will occur, and bubble nuclei will be generated and expanded continuously. The function of micro-explosion is to improve the surface activation energy of oil droplets. Composite diesel oil is water-in-oil (W/0) emulsion, with diesel oil as external phase and water as internal phase. Because the boiling point of oil is higher than that of water, when heating, water always reaches the boiling point first, boiling or evaporating. When the pressure inside the oil droplet exceeds the sum of the surface tension of the oil and the environmental pressure, the water vapor will break through the resistance of the oil film and make the oil droplet explode to form finer oil droplets. After the explosion, the oil droplets are smaller, so the combustion is more complete, thus achieving the effect of energy saving.