Waste converted to energy is a global trend, and the industry is devoting more efforts to this direction. In addition to reducing the cost of waste disposal, it can bring down the cost of raw materials or fuels. For the earth, it can also mitigate the harm of environmental pollution and ease the problem of the fossil fuel energy crisis. NCKU environmental engineering chair professor Wen-chih Lee’s team mixed 84-89% heavy oil, 10-14% oily industrial wastewater and 1% emulsifier proportionally and then fed them into the homogeneous emulsifying equipment with super-high revolutions. The continuous emulsifying equipment was used to develop heavy oil emulsifying technology to meet the feasibility of future industry application
In terms of energy efficiency testing, compared with 100% heavy oil used in seven chemical factories, it increased by 12.8-28.2%, with an average of approximately 18%. In addition, emulsified heavy fuel oil has made a significant contribution to pollutant emission reduction. Carbon dioxide emissions decreased by 14-28%, sulfur oxides by 15%, nitrogen oxides by 17%, granular pollutants by 36%, carbon monoxide by 84%, polycyclic aromatic hydrocarbons by 37%, and carcinogenic equivalents by 47% after conversion. According to the data, emulsified heavy fuel oil can not only improve energy efficiency and make combustion more complete, but also contribute significantly to pollutant reduction. Taiwan's industry spends NT$300 billion a year on heavy oil. If all industries switch to emulsified heavy fuel oil developed by NCKU, there will be 10% profit after deducting equipment costs, emulsifiers and other costs, which will save at least NT$30 billion a year. Upon calculation by a chemical plant, it decided, when building its third boiler, to adopt the emulsified heavy fuel oil invented by the NCKU team, which required about NT$500,000 for related equipment. In the past, heavy oil used to cost NT$5 million per month, and the use of emulsified heavy fuel oil could save NT$500,000 per month and NT$6 million per year reflecting a 10% energy saving basis. In addition, emulsified heavy fuel oil solves the problems of oily industrial wastewater treatment and discharge. After preliminary separation of oil from water from oily industrial wastewater, the remaining oily water can be directly used to produce emulsified heavy fuel oil without discharging industrial wastewater, saving a treatment fee of NT$6,000 to NT$10,000 per metric ton. Moreover, based on the carbon tax (or carbon trading price) of NT$400-800 per metric ton of carbon dioxide emissions, approximately NT$16.7-33.4 billion is required payment for burning heavy oil in Taiwan in one year, and NT$2.3-4.7 billion for a minimum reduction of 14% if emulsified heavy oil is used. The emulsified heavy fuel oil from oily wastewater has been put into production. It achieves the reliable, sustainable and modern energy described in SDG7, and also solves the most important price issue of alternative fuels if used in large quantities. From the final calculation, affordable energy is just around the corner!