Patent ID: 6834503
Filing Date: 2004-12-28
Classification: F01B,F01K,F02B,Y02T

Abstract:
A process for operating a steam thermal engine, comprising:heating a liquid working medium to a low temperature at a low pressure in a first heat exchanger using external waste heat of relatively low energy, to form a wet steam; heating the wet steam to a relatively high temperature by feeding the wet steam to a second heat exchanger heated by external waste heat of relatively high energy; injecting liquid working medium or condensate of relatively low boiling temperature from the first heat exchanger into steam atmosphere of the second heat exchanger to produce a hot steam, which is used to perform work in an expansion unit of the thermal engine, with an instantaneous evaporation of the working medium of approximately boiling temperature with a significant increase in pressure; feeding the hot steam back into the first heat exchanger as condensate after the hot steam has performed the work; and pre-compressing the steam from the first heat exchanger and feeding the steam to the second heat exchanger, whereby both the pressure and the temperature of the steam in the second heat exchanger increase before the liquid working medium is injected into the second heat exchanger.