WO2010053278A3 - Vertical and horizontal integrated heat exchange units equipped with a waste heat recovery system - Google Patents

Abstract

The present invention relates to vertical and horizontal integrated heat exchanger units equipped with a waste heat recovery system designed in such a way that during heat exchange between a high-temperature waste heat supplied by a drier during blow dry and a low-temperature exhaust gas, the heat is recovered from the heat source and is supplied to the drier in the form of hot air via a condenser. Provided is a vertical integrated heat exchange unit (10) for supplying hot air to the inside of a drier (30) through a discharge duct (18) when external fresh air is sucked into a suction chamber (12) by a fan blower (14) driven by a driving device (15) and is passing through a heat exchanger (17) for generating a heat source. Said vertical integrated heat exchanger comprises: a compressor (50) installed on the upper side of the suction chamber (12) so as to compress an introduced low-temperature, low-pressure refrigerant to a high-temperature, high-pressure refrigerant, and to introduce the refrigerant into said heat exchanger (17) for generating a heat source; a heat exchanger (41) for recovering waste heat which is installed inside a discharge duct (40) for discharging waste heat from the inside of said drier (30) installed on the upper side of a discharge duct (18) in which said heat exchanger (17) for generating a heat source is installed, so as to exchange heat between the high-temperature waste heat discharged through said discharge duct (18) and a low-temperature exhaust gas; and a refrigerant expansion device (60) for converting the compressed high-pressure refrigerant discharged through a refrigerant discharge pipe (17b) of said heat exchanger (17) for generating a heat source into a low-temperature, low-pressure refrigerant, and introducing the low-temperature, low-pressure refrigerant to said heat exchanger (41) for recovering waste heat. Said heat exchange unit as described above requires low power and thus can greatly saving energy in comparison to heat exchangers used in conventional integrated heat exchange units (steam heater type, thermal medium heater type, and electric heater type). Also, said heat exchange unit uses electricity which is a clean fuel, and thus does not produce exhaust gases, while steam heater type and thermal medium heater type heat exchange units produce exhaust gases. In addition, said heat exchange unit consumes the least energy among existing integrated heat exchange units, thereby reducing production costs (a minimum of 20% of the energy consumed by using electric heaters and 5% of the energy consumed by using boiler kerosene). Furthermore, said heat exchange unit requires only 15–20% of the power consumed by using electric heaters, thus remarkably reducing a primary power installation cost, preventing a sharp increase in the amount of electricity used due to increasing oil costs, and reducing losses due to labour costs incurred when the amount of electricity consumed exceeds a certain amount. Said heat exchange unit also does not require separate secondary equipment (a boiler room, etc.), and thus can be installed in small spaces.