UTILIZATION OF STEAM HEAT BY WASTE HEAT RECOVERY CHILLER WITH HEAT PUMP FOR COOLING OF MARINE DIESEL ENGINE INTAKE AIR

Abstract

A distribution of high potential heat of steam, produced by exhaust gas waste heat recovery boiler, in waste heat recovery chiller for cooling of marine diesel engine intake air has been analyzed. A different variants of possible distribution of heat loads upon the generator of high pressure refrigerant vapour in waste heat recovery cooling system on the base of ejector refrigerant chiller as an example were investigated. It was shown that for maximal realization of high potential heat of steam it is necessary to use it for producing a high pressure refrigerant vapour in the evaporative section of ejector refrigerant chiller generator while a low potential heat of water condensate and other heat sources might be used for heating a refrigerant condensate from its condensing temperature to the boiling temperature in the economizer section of generator. An application of heat pump for increasing the potential of addition heat sources was proposed. As an example the heat loads upon evaporative and economizer sections of generator of ejector refrigerant chiller with buster heat pumps in dependence of distribution of high potential heat of steam between the sections for coefficients of performance of waste heat recovery ejector chillers and of electrical driven vapour compression refrigeration chillers were presented. With this the economizer section of generator of ejector refrigerant chiller includes two stages; in the first stage along the refrigerant condensate flow (heat pump stage) a low potential heat of diesel engine cooling water preheated in heat pump was used for preheating a refrigerant condensate and in the second stage a part of condensation heat of steam from exhaust gas waste heat recovery boiler and the heat of its condensate at high temperature was used.