Furnace heat exchanger

Abstract

The present invention provides an alternative single burner heat exchanger combination for a gas-fired furnace for hot air generation to be used to heat spaces in residential and commercial settings. The fuel fired furnace is compiled of the known set-up of a plurality of spaced heat exchangers wherein each heat exchanger has an inlet port for receipt therein of combustion gases. The single burner is a premix burner providing an excellent combustion of the gas-air mixture. The burner is in fluid communication with each port of each heat exchanger through a dilution zone and a distributor. Preferably, these are all airtight connected to each other as can be seen in FIG. 2 . The combustion gases produced by the premix burner are mixed with secondary air flows entering the system in this dilution zone, whereby diluted combustion gases are obtained. These diluted combustion gases will then enter the heat exchangers via the distributor. The combustion gases, having a temperature of about 1600° C. are diluted with the secondary air flows to a temperature of about 600° C. The premix burner is surrounded by a shield, which prevents a direct cooling of the flames on the burner membrane. When flames are cooled by an air flow, CO levels rise because complete combustion of the combustible air/gas mixture is prevented. In the system of the invention a complete combustion of the combustible air/gas mixture is achieved and the right temperature of gases is delivered to the heat exchangers, without creation of undesirable combustion products since cooling of the flames is avoided.

1 . A single burner heat exchanger combination for a gas-fired furnace, comprising:
 at least one or a plurality of spaced apart heat exchanger elements, each heat exchanger element having an inlet port for receipt therein of combustion gases,   and a premix burner for producing combustion gases,   said burner being in fluid communication with each port through a dilution zone and a distributor,   said dilution zone being fed by said combustion gases and a secondary air flow and providing diluted combustion gases,   said distributor feeding said diluted combustion gases to said heat exchanger elements,   said burner being surrounded by a shield.   
   
   
       2 . The single burner heat exchanger combination of  claim 1 , wherein said burner comprises a self regulating system for proper gas-air ratio supply to the mixing chamber of the premix burner. 
   
   
       3 . The single burner heat exchanger combination of  claim 2 , wherein said self regulating system comprises a bi-metal. 
   
   
       4 . The single burner heat exchanger combination of  claim 1 , wherein said burner is a tubular burner comprising a burner membrane and an endcap, wherein said burner membrane comprises a perforated sheet metal, preferably made of refractory steel. 
   
   
       5 . The single burner heat exchanger combination of  claim 1 , wherein said burner is a tubular burner comprising a burner membrane and an endcap, wherein said burner membrane comprises a metal fibre burner membrane. 
   
   
       6 . A gas fired furnace comprising a single burner heat exchanger as defined in  claim 1 . 
   
   
       7 . Use of a single burner heat exchanger combination as defined in  claim 1 , in a gas-fired furnace for hot air generation. 
   
   
       8 . The single burner heat exchanger combination of  claim 2 , wherein said burner is a tubular burner comprising a burner membrane and an endcap, wherein said burner membrane comprises a perforated sheet metal, preferably made of refractory steel. 
   
   
       9 . The single burner heat exchanger combination of  claim 3 , wherein said burner is a tubular burner comprising a burner membrane and an endcap, wherein said burner membrane comprises a perforated sheet metal, preferably made of refractory steel. 
   
   
       10 . The single burner heat exchanger combination of  claim 2 , wherein said burner is a tubular burner comprising a burner membrane and an endcap, wherein said burner membrane comprises a metal fibre burner membrane. 
   
   
       11 . The single burner heat exchanger combination of  claim 3 , wherein said burner is a tubular burner comprising a burner membrane and an endcap, wherein said burner membrane comprises a metal fibre burner membrane. 
   
   
       12 . A gas fired furnace comprising a single burner heat exchanger as defined in  claim 2 . 
   
   
       13 . A gas fired furnace comprising a single burner heat exchanger as defined in  claim 3 . 
   
   
       14 . A gas fired furnace comprising a single burner heat exchanger as defined in  claim 4 . 
   
   
       15 . A gas fired furnace comprising a single burner heat exchanger as defined in  claim 5 . 
   
   
       16 . Use of a single burner heat exchanger combination as defined in  claim 2 , in a gas-fired furnace for hot air generation. 
   
   
       17 . Use of a single burner heat exchanger combination as defined in  claim 3 , in a gas-fired furnace for hot air generation. 
   
   
       18 . Use of a single burner heat exchanger combination as defined in  claim 4 , in a gas-fired furnace for hot air generation. 
   
   
       19 . Use of a single burner heat exchanger combination as defined in  claim 5 , in a gas-fired furnace for hot air generation.