Inverted full-premix condensing gas water heater

Abstract

The invention discloses an inverted full-premix condensing gas water heater. An inverted metal fiber burner is used. A primary heat exchanger and a secondary heat exchanger are both inverted. Reasonable proportion of gas valve assemblies to fans is controlled via a master controller. Mixed gases enter a gas mixer and are mixed well by the gas mixer prior to entering a burner assembly, and uniformity of the gas mixture is guaranteed when the gas mixture enters the burner. Burning in the full-premix way need not air supply any more, the ratio of actual air to theoretical air is 1.3:1, burning efficiency is high, flames are short, temperature is low, and emission level is high. The metal fiber burner with wide regulating ratio range is used, and accordingly all fire power requirements can be met with no need of subsection control. In addition, the burner and the heat exchangers are inverted for the problem of proneness to blockage of the metal fiber burner, so that the problem that residue of the heat exchangers falls on the burner in long-term use is solved; condensate is discharged through a liquid sealing device, and smoke leakage is effectively prevented.

Description

technical field [0001] The invention relates to a gas water heater, in particular to a fully premixed condensing gas water heater. Background technique [0002] Most of the existing gas water heaters adopt the atmospheric combustion method: gas and air are mixed in the burner for combustion, and the high-temperature flue gas after combustion is mixed with excess air and enters the heat exchanger for heat exchange. Exhaust to atmosphere. After the excess air and high-temperature flue gas are mixed in the combustion chamber, the temperature of the high-temperature flue gas will be reduced, reducing the efficiency of heat exchange, and the excess air will take away part of the heat of the high-temperature flue gas, further reducing the thermal efficiency. The exhaust gas temperature of a general gas water heater is above 110°C, and the excess air coefficient is above 1.8, that is, 80% of the excess theoretical air volume participates in the combustion process and takes away he...

AI Technical Summary

Problems solved by technology

The exhaust gas temperature of a general gas water heater is above 110°C, and the excess air coefficient is above 1.8, that is, 80% of the excess theoretical air volume participates in the combustion process and takes away heat, thereby reducing the thermal efficiency of the gas water heater.

Moreover, the combustion flame of atmospheric combustion is divided into inner flame and outer flame, the overall length is longer, the height of the combustion chamber is relatively high, the combustion heat intensity of atmospheric combustion is low, and a large load requires a large combustion space; the atmospheric combustion method is the first The secondary mixing is not uniform enough, CO and NOx are easy to produce, and the content is relatively large

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