| Abstract |
The calculation of NOx emission in the industrial furnaces hasn't been solved yet. There are two main causes of it: l. The reaction-kinetic processes haven't been clarified yet. The use of the traditional Zeldovits equations doesn't give an exact result. The calculation methods have been successfully corrected by many research workers, among them Fenimore, [6], DeSoete, [7] Bowmann, [8], etc., but today we can obtain approximate results only by "supposing" the maximum values of flame-temperatures and by "accelerating" certain reactions even in case of simple flames. The maximum flame-temperatures measured in the experimental furnaces by the leading research workers reach only 1400-1500 C, and by this only a minimum quantity of Thermo-NO can develope within the available very short time. According to the experiments carried out in an electric furnace by the author, the quantity of NO developing in the air does not exceed 1 ppmv at these temperatures [5]. Owing to this fact further researches are necessary in order to clarify the origin of the missing NO concentration. 2. Though the research workers dealing with the science of furnaces agree upon, that the NOx emmission is a burner-specific phenomenon, and it can be known and approximated by calculations only in case, if we know exactly the effect of burners. Relatively few researches can be found in the references (see e.g. [11, 12, 13, 14, 15], where the NOx-development have been investigated by means of the systematic comparison of the properties of burners. The method accepted for systemizing the burners is also missing at present, though it is the first step for developing the calculation system of burner-specific NOx emmission. We try to work out a system for the burners and their effects in order to facilitate the development of a computer program. The present paper is the continuation of the paper read on the IFRF Conference held in Holland (May 1988). |
