Abstract: Using heat balance analysis method based on the working steam in mixing gas at exhausting port of ejector to be located superheating situation to calculate ejecting coefficient, the heat balance analysis consider both relation on expansion of working steam pass to compression of mixing gas and influence of the temperature difference on inlet state of ejector pass to outlet state of nozzle, and that the influence of heat value change on gas mixing process. That is concentrate the all change relation on heat value at ejector working into calculating result. So that not only the real temperature of mixing gas at exhausting port of ejector can be achieved but the coincidence degree is increased between calculating result and real value at working.

Key words: Ejecting coefficient, Ejector, Heat balance analysis method, Steam-jet pump