Combustion apparatus having intake air/exhaust air heat exchanger

Abstract

The present invention relates to a combustion apparatus having an intake air/exhaust air heat exchanger. The combustion apparatus comprises: a burner for generating exhaust gas; a blower for supplying external air to the burner; a main heat exchanger for absorbing heat from the exhaust gas generated by the burner; an exhaust gas duct for discharging the exhaust gas having passed the main heat exchanger to the outside; an intake air duct for introducing external air to the blower; an intake air/exhaust air heat exchanger for exchanging heat between the external air introduced to the blower and the exhaust gas discharged through the exhaust gas duct using a thin film plate disposed therebetween; and an exhaust flue for discharging the exhaust gas having passed the intake air/exhaust air heat exchanger to the outside.

1 . A combustion apparatus comprising:
 a burner that generates exhaust gas;   a blower that supplies external air to the burner;   a main heat exchanger that absorbs heat from the exhaust gas generated by the burner;   an exhaust gas duct that discharges the exhaust gas having passed through the main heat exchanger to the outside;   an intake air duct that introduces the external air to the blower;   an intake air/exhaust air heat exchanger that exchanges heat between the external air introduced to the blower and the exhaust gas discharged through the exhaust gas duct using a thin film plate interposed therebetween; and   an exhaust flue that discharges the exhaust gas having passed through the intake air/exhaust air heat exchanger to the outside.   
     
     
         2 . The combustion apparatus of  claim 1 , wherein the main heat exchanger includes a sensible heat exchanger that absorbs combustion sensible heat generated by the burner and a latent heat exchanger that absorbs latent heat of the exhaust gas having passed through the sensible heat exchanger. 
     
     
         3 . The combustion apparatus of  claim 2 , wherein the intake air/exhaust air heat exchanger includes a plurality of thin film plates, each being formed into a flat plate shape, a first spacer that is provided to separate the thin film plates from one another and forms an intake air passage connected to the intake air duct, and a second spacer that is alternately laminated and arranged with the first spacer while being connected to the exhaust gas duct to form an exhaust gas passage so that heat exchange is performed between the exhaust gas passage and the intake air passage. 
     
     
         4 . The combustion apparatus of  claim 3 , wherein a temperature sensor for measuring the temperature of the exhaust gas passing through the inside of the exhaust gas duct is provided in the exhaust gas duct, and a control unit controls to stop the operation of the combustion apparatus when the temperature measured by the temperature sensor is a set temperature or higher. 
     
     
         5 . The combustion apparatus of  claim 3 , wherein each of the first spacer and the second spacer is formed into a curved shape so that peaks and valleys are formed thereon. 
     
     
         6 . The combustion apparatus of  claim 3 , wherein a thickness of each of the thin film plates and the first and second spacers is 20 to 70 μm. 
     
     
         7 . The combustion apparatus of  claim 3 , wherein the thin film plates and the first and second spacers are made of thermoplastic resin. 
     
     
         8 . The combustion apparatus of  claim 3 , wherein the exhaust gas is introduced from an upper side of the exhaust gas passage, and flows vertically downward. 
     
     
         9 . The combustion apparatus of  claim 8 , wherein a condensed water discharge pipe for discharging condensed water is connected to the outlet side exhaust gas duct connected to the exhaust gas passage. 
     
     
         10 . The combustion apparatus of  claim 3 , wherein a distance between the thin film plates that form the intake air passage is smaller than a distance between the thin film plates that form the exhaust gas passage. 
     
     
         11 . The combustion apparatus of  claim 3 , wherein the exhaust flue is made of a synthetic resin material.