Pulse Combustion Burner as Cleaning Device of Boiler Heating Surfaces – Experimental Investigation –

Energy conversion from fossil fuels usually begins with combustion processes accompanied by series of technical and technological problems and very often produces significant amount of pollution. Problems are often encountered in cases of combustion of low ranking, low-reactive and deposition tending coals, like some of those exploited in Bosnia and Herzegovina. Because of these reasons, it is necessary to develop new and improve existing technologies of low pollution combustion, not enough investigated so far, especially in cases when low ranking coals are used. In this regard, the pulse combustion offers good possibilities. Additionally, the pulse combustion could be applied as auxiliary method in existing large-scale boilers as a cleaning device of outer heating surfaces. In this paper, the most recent results obtained from experimental work at Mechanical Engineering Faculty in Sarajevo are presented. 1. INTRODUCTION, [3] About 80 % of primary energy spent in the world is obtained from fossil fuels. Such situation, where energy needs are dominantly met by conversion of primary energy from fossil fuels, will continue also in the future. Bosnia and Herzegovina (BIH) is not a exception. It is well known that coals are most used fossil fuel. About 75 % of all worlds fossil fuel reserves are coals (Figure 1). It is estimated that with today's level of energy consumption the coal reserves are sufficient for next 200 years. Additionally, the coal reserves are more uniformly situated then the petrol reserves. Because of the rapid decrease of the petrol natural gas reserves, importance of the coal as energy source will probably rise in the future. On the other side, reserves of high quality coal are also decreasing and need to exploit low quality coals is more pronounced. In the process of conversion of the primary energy from fossil fuels combustion is the most important part with a variety of technical and technological problems and it is always potential source of pollution. Probability that problems will occur during a combustion process depends on a series of variables, but these problem occur more often during combustion of low ranking, low-reactive and deposition tending coals, like some of those exploited in BIH. There are very important deposits of lignite and brown coals in BIH, but there is no any stone coal. Due to last estimations, there are about 4⋅10 9 tones of coal, where 40 % are brown coals and 60 % is lignite. The quality of coals …