Boiler

Abstract

A boiler comprising an enclosure which forms a heating chamber which contains water to be heated and accommodates a firebox which forms a combustion chamber with a burner associated therewith which comprises a combustion head, arranged in the combustion chamber and connected to a supply duct, and provided with a premixer of combustion air and combustible gas which is interposed along the supply duct. The combustion chamber is connected to a stack for the evacuation of the combustion gases into the external environment. Means are further provided for generating a flow of a mixture of air and gas toward the combustion head. The particularity of the invention resides in that it comprises at least one duct for conveying the combustion gases which connects the stack to the supply duct. Also according to the invention, the flow generation means comprise means which are adapted to place the combustion chamber in partial vacuum with respect to atmospheric pressure.

Description

Technical field [0001] The invention relates to a boiler. Background technique [0002] Known boilers are used to produce hot water or steam. The boiler is composed of an outer shell, which forms a water heating chamber and contains a firebox inside. The fire box and the water to be heated contained in the heating chamber are Heat exchange relationship. [0003] The combustion chamber is formed in the fire box and houses the combustion head of the burner capable of generating flames in the fire box. Accordingly, the combustion chamber is connected to a plurality of heat exchange tubes, and hot combustion gas generated by the flame flows in the heat exchange tubes and passes through the heating chamber, so that the hot combustion gas can heat the water contained in the heating chamber. [0004] The heat exchange tubes are combined in the combustion gas collection chamber, and the heat exchange tubes are discharged from the combustion gas collection chamber through the exhaust pipe. ...

AI Technical Summary

Problems solved by technology

[0010] In forced draft burners, the combustion gas recirculation must be regulated by means of a valve with self-regulation that allows its opening to be variable based on the parameters of the combustion and the power of the flame, so that the combustion gas temperature probe is necessary, usually an oxygen probe and in any case the presence of electronics to adjust the opening of the valve, which is therefore accompanied by complications in terms of construction

[0011] Thermal NOx suppression with premixed burners is currently achieved by supplying an excess of oxidizing air in the combustion mixture instead, however this inevitably leads to a significant reduction in the combustion efficiency of the boiler

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