| 摘要 |
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.
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