The slag water heat exchanger of our company has already formed modularized design,can freely combine into different systems according to the demand of customers.Every module is composed by two dedicated heat exchangers of slag water,when the module is running normally two heat exchangers work at the same time,can transfer the heat of slag water to heating water at maximum,guarantee the temperature of heating water.The two slag water heat exchangers can use individually at the beginning or the last stage of heating or when the heat exchanger is being maintened,in order to guarantee the normal running of the exchanging heat system in heating period.And it can be reserved heat exchanging ability when being designed,may increase modular,and it can be overhauled and replaced very conveniently.