TED-AJ03-615 LOW NO_x COMBUSTION OF PETROLEUM WITH HIGH TEMPERATURE AIR COMBUSTION TECHNOLOGY

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Development of a combustion technology with low emission of harmful matters such as NOx, soot, and so on, is becoming more and more important because severe regulation for these materials will be adapted in the world. Many technologies for reducing the harmful matters are known and some of them are used in practical furnaces. However, these technologies are not so sufficient for overcoming more severe regulations in near future. High temperature air combustion technology has been investigated both from fundamental and practical point of view [1∿4], however it is still restricted in limited applications and fuels, i. e., industrial furnace used in steel fabrication and gaseous fuels. In order to develop the technology, wide applications and utilization of various kinds of fuels should be needed. Development of clean combustion technology of petroleum is very important, because petroleum is still the major energy source in many countries. However, little was known for investigating the combustion phenomena with liquid fuels [5∿7]. Therefore, we have started the fundamental studies on spray combustion of petroleum by applying the high temperature air combustion technology [8acd;11]. In the previous study, we have used a small combustor (10 kW) for evaluating the combustibility of kerosene and heavy oil A. As the results, we have found some conclusions described in the following section. On the basis of these fundamental results, we have started the development of high temperature air combustion technology with petroleum aimed for practical use. We present here an ultra low NOx combustion technology of petroleum using a 0.4 MW class furnace. Combustibility of petroleum was investigated with high temperature air combustion technology. As decreasing the air ratio, the flame was enlarged and flameless oxidation was observed. Ultra low NOx emission was achieved both for kerosene and heavy oil A as fuels. Thermal NOx was extremely reduced as decreasing the air ratio. The NOx emission depends on the furnace temperature but not on the combustion amount. Fuel NOx was also reduced when the combustion was conducted at low oxygen concentration. Introducing the high temperature (∿1000℃) steam could decrease the thermal NOx emission especially at high air ratio region, where NOx was produced in a high level. Under the low NOx combustion condition, uniform distribution of temperature was confirmed.
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TED-AJ03-615 LOW NO_x COMBUSTION OF PETROLEUM WITH HIGH TEMPERATURE AIR COMBUSTION TECHNOLOGY

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