Method for operating heat generating system for generating heat from waste heat of exhaust gases in e.g. condensing boiler, involves using part of heat potential of heated cold water by heat exchanger for generating hot water

摘要

The method involves heating cold water, which is provided in a closed cooling water circuit, by utilizing exhaust gas heat exchangers (6.1, 6.2). A part of heat potential of heated cold water is used by a heat exchanger (13) for generating hot water, where mixing of the cold water and the hot water is avoided. The cold water is circulated in a cooling water circuit so that a temperature difference of 10 kelvin is obtained between input and outputs of the exhaust gas heat exchangers, respectively. An independent claim is also included for a system for generating heat from waste heat of exhaust gases in natural gas-operated boiler plant and/or block heat and power plant.