Experimental study of krone burning parameters of the most common trees in Vietnam

Introduction. The absence of the burning parameters of forest combustible materials does not allow a reliable calculation of the heat flux from a forest fire affecting the energy facilities of Vietnam. Therefore, the study of the combustion of samples of Vietnamese trees krone is an urgent scientific and practical problem. Goals and objectives. The purpose of the article is to substantiate the source data for mathematical modeling of the parameters and thermal effects of high forest fires on the objects of power industry in Vietnam. To achieve it, experimental studies of the burning of trees krone samples of the most common deciduous and coniferous trees of Vietnam were carried out. Methods. An experimental method is used to study the burning of trees krone samples in a small-sized experi-mental installation. The analysis of the results is made. Results. Experimental dependences of the specific mass speed of gasification and specific coefficient of release of carbon monoxide on the time of testing of trees krone samples of five most common deciduous and coniferous trees of Vietnam were obtained. The average values of the above mentioned parameters were compared with the values obtained during the burning of tree trunk samples and given in the literary sources. It is shown that time--average experimental values of specific mass speed of gasification of all samples of tree krone are 2.7–5.7 times less than corresponding values, which were determined during tree trunks burning. At the same time experimental average values of specific coefficient of release of carbon monoxide at burning of tree krone are 2.5–10.9 times more than corresponding values in case of burning of wood mass of tree trunks. Conclusion. An experimental study of the burning of trees krone samples of the most common deciduous and coniferous trees of Vietnam allows to substantiate the choice of specific coefficient of release of carbon monoxide and specific mass speed of gasification required for mathematical modeling of parameters and thermal effects of high forest fires on Vietnamese energy facilities.