MECHANISM OF THE INFLUENCE OF THE EXPLOSIVE BYPASS VALVE ON DEVELOPMENT OF EXPLOSION IN MULTI-PASS GAS FURNACE

Previously it was found that safety in the gas explosion in the multi-pass gas furnace can be achieved by using a explosive bypass valve, which connects the combustion chamber and chimney at explosion moment. In the study of the mechanism of influence of the valve on the development of the explosion, it was assumed that the major factors that caused the change process are the size of the flame front, the approach of the ignition source to the flue gas and hydraulic resistance movement. Objective of this study was to evaluate the degree of influence of each of these factors on the pressure drop. The answer was found during the numerical experiment with the software, which is based on the method of large particles. During the experiment purging the furnace was modeled in two versions: with or without a valve. It was found that in the case of the valve first factor contributes to the growth of the explosion pressure, and the second — reduce the pressure, but its impact has been negligible. Analysis of the pressures that were obtained by physical experiments and computer simulations, it is found that the dominant factor in the reduction of pressure is to reduce the hydraulic resistance when moving gas from the burner to the chimney.