Semi-backdraft type small-size fuel oil and fuel gas hot water boiler

Abstract

The invention provides a semi-backdraft type small-size fuel oil and fuel gas hot water boiler. The semi-backdraft type small-size fuel oil and fuel gas hot water boiler comprises a base, a boiler shell, an outer tank, an inner tank and a combustor, and is characterized in that the inner tank is horizontally arranged along a flame direction and the horizontal length of a combustion room formed by the inner tank is greater than the length of combustion flame; a smoke pipe is vertically arranged above the middle part of the combustion room; the end opening at the lower part of the smoke pipe is located in a central flame region; the horizontal length of the combustion room is greater than the length of the combustion flame; the flame is expanded to combust and the combustion efficiency can be improved; a certain distance is kept from the smoke pipe to the rear end of the inner tank to form backdraft; the central flame is disturbed and cooled and the generation of NOx (namely nitrogen oxides) can be inhibited and environmental friendliness is facilitated; and upward smoke wind resistance of smoke of the vertical type smoke pipe is small, back pressure needing to be overcome by the combustor is small and the working noises of the combustor can be reduced.

Description

technical field [0001] The invention relates to a heating equipment, in particular to a semi-backfired small fuel gas hot water boiler. Background technique [0002] At present, the small vertical oil-fired gas-fired hot water boilers on the market are generally circular, and can be divided into two categories according to the installation position of the burner, namely the bottom-mounted type and the top-mounted type, and they have the following shortcomings: [0003] Small vertical fuel gas hot water boiler with bottom burner: The combustion chamber is limited by the diameter of the furnace body, and the combustion flame cannot be expanded, resulting in insufficient combustion. The ash cleaning port and the smoke outlet are shared, and the chimney needs to be removed when cleaning the ash accumulation in the smoke pipe in the furnace, which is extremely inconvenient; [0004] Small vertical fuel gas hot water boiler with upper burner: the combustion chamber is vertical, a...

AI Technical Summary

Problems solved by technology

However, the overhead burner is inconvenient to observe the working status of the burner. After the boiler is shut down, the high-temperature flue gas in the furnace will inevitably heat the burner, which will affect the service life of the burner. Moreover, due to the downward combustion flame, the smoke resistance of the body is large, which requires the burner The back pressure overcome increases

[0005] Moreover, the above two small vertical fuel-fired gas-fired hot water boilers are all in the downstream combustion mode, and the boiler smoke pipe is arranged at the end of the jet flame, resulting in a high content of NOx (nitrogen oxides) in the flue gas, which is not conducive to environmental protection

[0006] In order to solve this problem, the combustion method of the existing small vertical oil-fired gas-fired hot water boiler has been improved by adopting full-back combustion. Combustion produces NOx (i.e. nitrogen oxides), but since the content of NOx (i.e. nitrogen oxides) produced in the central flame area is relatively high during flame combustion, none of the above methods can effectively reduce the production of NOx (i.e. nitrogen oxides) in the central flame area. content, so the inhibition effect on NOx (nitrogen oxides) produced by combustion is not ideal

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